US20100057169A1 - Thermoregulation device - Google Patents
Thermoregulation device Download PDFInfo
- Publication number
- US20100057169A1 US20100057169A1 US11/909,240 US90924006A US2010057169A1 US 20100057169 A1 US20100057169 A1 US 20100057169A1 US 90924006 A US90924006 A US 90924006A US 2010057169 A1 US2010057169 A1 US 2010057169A1
- Authority
- US
- United States
- Prior art keywords
- heat exchange
- layer
- exchange layer
- fluid circuit
- stretchable material
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Images
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F7/00—Heating or cooling appliances for medical or therapeutic treatment of the human body
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F7/00—Heating or cooling appliances for medical or therapeutic treatment of the human body
- A61F2007/0054—Heating or cooling appliances for medical or therapeutic treatment of the human body with a closed fluid circuit, e.g. hot water
Definitions
- thermoregulating apparatus for exchanging thermal energy with a patient.
- the apparatus includes a flexible heat exchange layer and a heat exchange fluid circuit located within the heat exchange layer.
- the heat exchange layer has a length, a width and a thickness wherein the length and width are both substantially greater than the thickness.
- the heat exchange layer also defines at least one support surface.
- the heat exchange fluid circuit includes at least a first segment and a second segment. At least one pressure relief segment is located between the first and second segments of the heat exchange fluid circuit.
- Differential elongation of the pressure relief section relatively repositions the first and second heat exchange segments in at least one direction when a force is applied to the heat exchange layer in a direction substantially transverse to the support surface of the layer and at a location proximate the pressure relief section and the first and second fluid circuit segments.
- the pressure relief section may take the form of an opening that extends through the entire thickness of the heat exchange layer.
- a resiliently stretchable material such as a fabric made with spandex fibers, may be used to form the pressure relief section.
- the at least one pressure relief section comprises an opening extending the full thickness of the heat exchange layer.
- the first and second heat exchange segments each comprise an elongate conduit.
- the heat exchange layer When the heat exchange layer is positioned in a substantially planar orientation at least a portion of one of the conduits defining the first and second heat exchange segments has an arcuate configuration. Differential elongation of the pressure relief section and the first and second heat exchange segments repositions at least a portion of the arcuate configuration into a more linear configuration.
- the heat exchange fluid circuit comprises at least one elongate conduit arranged in a grid including a plurality of nodes.
- Each of the nodes defines an intersection of a first segment of the conduit with a second segment of the conduit.
- the first segment is fixed relative to the second segment at each node.
- the heat exchange layer is positioned in a substantially planar orientation the nodes are separated by a first set of distances.
- the first and second segments of the conduit extend between the nodes define a second respective set of lengths, the second set of lengths are greater than the first set of distances allowing the nodes to be repositionable to define a third set of distances separating the nodes that is greater than the first set of distances.
- the fluid structure comprises at least one elongate conduit.
- the conduit has at least one substantially serpentine portion.
- the serpentine portion defines a plurality of substantially parallel spaced apart linear segments.
- a plurality of the pressure relief sections are disposed between the linear segments of the conduit.
- the pressure relief sections comprise a segment of resiliently stretchable material have opposing edges. Each of the opposing edges is secured to a respective one of the linear segments.
- the first and second heat exchange segments each comprise an elongate conduit.
- the thermoregulating apparatus further comprises at least one resiliently stretchable material layer.
- the at least one stretchable material layer defines a first sleeve and a second sleeve.
- the first and second heat exchange segments are respectively disposed within the first and second sleeves.
- the thermoregulating apparatus further comprises a support structure underlying the flexible heat exchange layer.
- the support structure includes a plurality of gas filled support cells.
- the plurality of gas filled support cells comprise a plurality of substantially cylindrical cells. Each of the cells define an axis oriented substantially transverse to the support surface.
- thermoregulating apparatus for exchanging thermal energy with a patient
- the apparatus includes a flexible heat exchange layer and a heat exchange fluid circuit having an elongate conduit with a serpentine portion.
- the heat exchange layer has a length, a width and a thickness wherein both the length and the width are substantially greater than the thickness.
- the heat exchange layer also defines at least one support surface.
- the heat exchange fluid circuit is located within the heat exchange layer and when the heat exchange layer is in a substantially planar orientation, the serpentine portion of the fluid conduit defines a plurality of substantially parallel spaced apart linear sections connected by a plurality of arcuate sections.
- a stretchable material is located between the linear sections of the serpentine portion.
- the heat exchange layer comprises a bladder defining the fluid circuit.
- the at least one slit defining an opening that extends through the bladder.
- the bladder comprises a plurality of the slits.
- the plurality of slits are arranged in a grid pattern.
- the plurality of slits define elongate openings. A first portion of the elongate openings oriented substantially parallel to a first direction and a second portion of the elongate openings oriented substantially parallel to a second direction. The first and second directions arranged at an angle of approximately 90 degrees.
- the thermoregulating apparatus further comprises a support structure underlying the flexible heat exchange layer.
- the support structure includes a plurality of gas filled support cells.
- the plurality of gas filled support cells comprise a plurality of substantially cylindrical cells. Each of the cells define an axis oriented substantially transverse to the support surface.
- thermoregulating apparatus for exchanging thermal energy with a patient that includes a flexible heat exchange layer having a first sleeve portion and a second sleeve portion.
- a heat exchange fluid circuit is located within the heat exchange layer and includes a first segment and a second segment which are located in the first and second sleeve portions respectively.
- a resiliently stretchable material is located between the first and second segments.
- the flexible heat layer comprises first and second layers of the stretchable material.
- the heat exchange fluid circuit is disposed between the first and second layers of stretchable material.
- the stretchable material comprises elongate strips of stretchable material extending between the spaced apart linear segments.
- the stretchable material is resiliently stretchable to at least about 200% of its original length.
- the stretchable material comprises spandex fibers.
- the thermoregulating apparatus further comprises a support structure underlying the flexible heat exchange layer.
- the support structure includes a plurality of gas filled support cells.
- the plurality of gas filled support cells comprise a plurality of substantially cylindrical cells. Each of the cells define an axis oriented substantially transverse to the support surface.
- a thermoregulating apparatus for exchanging thermal energy with a patient comprises a flexible heat exchange layer, a first sleeve portion, a second sleeve portion, a heat exchange fluid circuit, and a resiliently stretchable material.
- the flexible heat exchange layer defines a length, a width and a thickness. Each of the length and the width are substantially greater than the thickness and the layer defines at least one support surface.
- the first sleeve portion and the second sleeve portion are formed within the flexible heat exchange layer.
- the heat exchange fluid circuit is disposed within the heat exchange layer.
- the heat exchange fluid circuit includes a first segment and a second segment. The first segment is disposed within the first sleeve portion and the second segment is disposed within the second sleeve portion.
- the resiliently stretchable material is disposed between the first segment and the second segment.
- the flexible heat exchange layer comprises first and second layers of stretchable material.
- the first and second layers are secured together to define the first and second sleeve portions. At least one of the first and second layers define the resiliently stretchable material disposed between the first segment and the second segment.
- first sleeve portion is disposed substantially parallel to the second sleeve portion. In a further embodiment, the first and second sleeve portions are substantially linear when the flexible heat exchange layer is disposed in a planar configuration.
- the stretchable material is resiliently stretchable to at least about 200% of its original length.
- the stretchable material comprises spandex fibers.
- the thermoregulating apparatus further comprises a support structure underlying the flexible heat exchange layer.
- the support structure includes a plurality of gas filled support cells.
- the plurality of gas filled support cells comprise a plurality of substantially cylindrical cells. Each of the cells define an axis oriented substantially transverse to the support surface.
- thermoregulating apparatus for exchanging thermal energy with a patient that includes a flexible heat exchange layer and a heat exchange fluid circuit that has at least one elongate conduit arranged in a grid.
- the grid includes a plurality of nodes with each of the nodes defining an intersection of a first segment of the conduit with a second segment of the conduit with the first segment being fixed relative to the second segment at each node.
- the heat exchange layer is positioned in a substantially planar orientation, the nodes are separated by a first set of distances and the first and second segments of the conduit extending between the nodes define a second respective set of lengths.
- the second set of lengths are greater than the first set of distances to thereby allow the nodes to be repositionable to define a third set of distances separating the nodes that is greater than the first set of distances.
- the flexible heat exchange layer further comprises at least one layer of a resiliently stretchable material defining the support surface.
- the heat exchange fluid circuit is disposed proximate the layer of stretchable material.
- the stretchable material is resiliently stretchable to at least about 200% of its original length.
- the stretchable material comprises spandex fibers.
- first and second segments of the conduit have an arcuate configuration when the flexible heat exchange layer is in a generally planar configuration.
- the conduit has a portion defining a generally sinusoidal configuration.
- the thermoregulating apparatus further comprises a support structure underlying the flexible heat exchange layer.
- the support structure includes a plurality of gas filled support cells.
- the plurality of gas filled support cells comprise a plurality of substantially cylindrical cells. Each of the cells define an axis oriented substantially transverse to the support surface.
- Yet another embodiment of the invention takes the form of a method of exchanging thermal energy with an object.
- the method includes providing a flexible heat exchange layer having a heat exchange fluid circuit disposed therein and including at least one pressure relief section and positioning an object on the heat exchange layer.
- the method also includes differentially resiliently elongating the flexible heat exchange layer to support the object thereon in a manner that facilitates equalization of a support pressure generated by the weight of the object and wherein a majority of the resilient elongation of the flexible heat exchange layer is defined by the pressure relief section.
- a heat exchange medium is circulated through the fluid circuit and thermal energy is exchanged between the object and the heat exchange medium.
- the object is a human.
- the pressure relief section is defined by an opening extending the full thickness of the heat exchange layer.
- the pressure relief section is formed by a resiliently stretchable material.
- the stretchable material is resiliently stretchable to at least about 200% of its original length.
- the stretchable material comprises spandex fibers.
- the fluid circuit includes an elongate conduit.
- the heat exchange layer When the heat exchange layer is in a substantially planar configuration, at least a portion of the conduit has an arcuate configuration.
- the step of resiliently elongating the heat exchange layer includes repositioning the portion of the conduit having an arcuate configuration into a more linear configuration.
- the fluid circuit includes at least one conduit arranged in a grid and having a plurality of nodes.
- the relative position of the nodes redefined by the step of resiliently deforming the heat exchange layer.
- the fluid circuit includes at least one elongate conduit having at least one serpentine portion.
- the method further comprises the step of providing a support structure to support the heat exchange layer and the object located thereon.
- the support layer includes a plurality of gas filled support cells.
- the plurality of gas filled support cells comprise a plurality of substantially cylindrical cells.
- FIG. 1 is an exploded perspective view of a hospital bed, a thermoregulating device and a patient.
- FIG. 2 is an exploded perspective view of a thermoregulating device.
- FIG. 3 is a partially cut away perspective view of a thermoregulating device that has been mounted on a plurality of gas-filled support cells.
- FIG. 4 is a perspective view of a fluid circuit for a heat exchange medium mountable in a thermoregulating device.
- FIG. 5 is a detail view of a portion of the fluid circuit of FIG. 4 .
- FIG. 6 is a schematic top view of a portion of the fluid circuit of FIG. 5 showing its deformation under load.
- FIG. 7 is a schematic side view of the fluid circuit portion shown in FIG. 6 .
- FIG. 8 is an exploded perspective view of the upper and lower stretchable layers of a thermoregulating device.
- FIG. 9 is a partially exploded perspective view of a thermoregulating device having sleeves for receiving fluid circuit conduits.
- FIG. 10 is a perspective view of an assembled thermoregulating device similar to that shown in FIG. 9 .
- FIG. 11 is a schematic illustration of a fluid circuit that can be used with the thermoregulating device shown in FIG. 10 .
- FIG. 12 is a schematic illustration of an alternative fluid circuit that can be used with the thermoregulating device shown in FIG. 10 .
- FIG. 13 is an exploded view of another embodiment of a thermoregulating device.
- FIG. 14 is a schematic depiction of the thermoregulating device of FIG. 13 deforming under load.
- FIG. 15 is a schematic side view of the thermoregulating device depicted in FIG. 13 .
- FIG. 16 is a perspective view of a portion of a heat exchange medium fluid circuit configured in a grid.
- FIG. 17 is a top view of a thermoregulating device including the fluid circuit grid of FIG. 16 .
- FIG. 18 schematically shows a portion of the fluid circuit grid of FIG. 16 in an unstressed configuration.
- FIG. 19 schematically depicts the fluid circuit portion of FIG. 18 deformed under load.
- thermoregulating device 20 for use with a hospital bed 22 having a patient support structure 23 is shown in FIG. 1 .
- a patient 24 may be supported by hospital bed 22 .
- device 20 In the treatment of patient 24 it may be desirable to either chill or warm patient 24 and device 20 can be employed for this purpose.
- a conventional heat exchange unit 26 is coupled with device 20 to circulate a heat exchange medium, e.g., water, through device 20 .
- Heat exchange units 26 are well known in the art and may include a compressor, a condenser and evaporator. Water, or other heat exchange medium employed with device 20 , may be chilled by exchanging thermal energy with the evaporator or the water may be warmed by exchanging thermal energy with the condenser.
- a pump located in unit 26 then circulates the water through device 20 .
- a patient When a patient is supported on a mattress or similar support structure it is desirable to equalize the support pressure at key pressure points on the patient (e.g., the back of the head or heals of the patient). If the pressure is not spread over a larger area of the patient at these key pressure points, the resulting pressure concentrations increase the likelihood that the patient will experience pressure ulcers or similar undesirable effects. It is known to provide patients with a patient support structure containing gas-filled chambers that facilitate the equalization of the pressure supporting the patient. Such patient support structures can be broadly categorized as powered air surfaces, non-powered air surfaces, or low air loss systems.
- non-powered air surfaces contain air-filled chambers that do not allow the intentional loss of air from within the chambers and do not require a continuous source of air to be supplied to the chambers.
- the PrimeAire® ARS Pressure Relief Mattress commercially available from Hill-Rom Company, Inc. having a place of business in Batesville, Ind. is an example of such a non-powered air surface that can be used as support structure 23 .
- Low-air loss systems are a type of powered surface that employ air-filled chambers that are designed to allow a small quantity of air to continuously escape from the chambers during use. An air supply unit is used with such low-air loss systems to maintain the air-filled chambers at a desired pressure.
- the Acucair® Continuous Airflow System commercially available from Hill-Rom Company, Inc. having a place of business in Batesville, Ind. is an example of such a low-air loss system that can be used as support structure 23 .
- the air-filled chambers facilitate the equalization of the pressure used to support the patient and it is common to use such patient support structures to minimize the risk of pressure ulcers.
- thermoregulating devices for chilling or warming a patient do not provide the pressure-equalization features of a patient support having air-filled chambers.
- Conventional thermoregulating devices often have strong polymeric exterior fabric covers that are not stretchable and do not readily conform to the contours of the patient being supported thereon.
- pressure spikes at key pressure locations of the patient and these point loads will be suspended by the fabric cover of the device in a phenomenon known as “hammocking.” Consequently, the benefits of a patient support structure having air-filled chambers are generally not obtainable if such a conventional thermoregulating device is placed between the patient and the patient support structure.
- Device 20 has a plurality of pressure relief sections which allow device 20 to more readily conform to the contour of the patient and thereby facilitate the equalization of the support pressure exerted by device 20 on patient 24 . In other words, it facilitates the reduction of the peak pressure the patient experiences at key pressure support locations.
- the illustrated support structure 23 has gas- or fluid-filled support cells 30 with a substantially cylindrical shape and vertically oriented axes 32 .
- Support cells 30 are formed out of a polymeric material such as polyurethane and have a hollow interior volume which is filled with a gas. In the illustrated embodiment, cells 30 are filled with air.
- Cells 30 include a lower radial flange 31 that is welded to upper sheet 34 of plenum layer 36 using radio frequency welding to form an air tight bond.
- Plenum layer 36 has an interior volume that forms an air chamber or plenum. Openings (not shown) in upper sheet 34 provide fluid communication between plenum 36 and each of the support cells 30 .
- cells 30 are shown in the illustrated embodiment as cylindrically-shaped, vertically oriented air bladders, the device of the present invention may be used in cooperation with other types of air bladders including more conventional horizontally oriented bladders, or with support layers filled with other materials, such as foam or three-dimensional fibers.
- Support structure 23 may take the form of a powered or non-powered air surface, or a low air loss mattress.
- support cells 30 are generally non-permeable to air.
- plenum layer 36 is also non-permeable to air and, by providing fluid communication between the inner volumes of each of the support cells 30 , maintains each of the support cells 30 at substantially equivalent pressures under differing load conditions. In other words, when a large load is placed on support structure 23 , the pressure within each of the support cells 30 will be raised, including those cells 30 which are not subject to the direct application of the load.
- upper plenum sheet 34 permits the limited passage of air therethrough.
- a separate air supply is coupled to plenum 36 to provide a continuous supply of air thereto to replenish the air lost through sheet 34 and maintain plenum 36 , and thus support cells 30 , at a desired pressure.
- the flow of air toward patient 24 generated by the loss of air through upper sheet 34 beneficially removes moisture from those portions of device 20 in direct contact with patient 24 .
- each individual support cell 30 compresses to an extent that is determined by the load placed on it. Weight loads placed on device 20 are transferred through device 20 and any intervening material layers to support cells 30 .
- Support structure 23 includes a patient support layer 38 that is sufficiently loose and flexible so that when a patient 24 is supported on layer 38 , layer 38 will generally conform to the body of patient 24 as it transfers the weight of patient 24 to support cells 30 .
- Support cells 30 are gas-filled and the interior space of cells 30 are interconnected so that the pressure of the gas in each of the cells 30 of the mattress or a particular zone of the mattress (i.e., a head section, seat section, or foot section) remains substantially equal.
- those cells 30 which have a particularly high load initially placed thereon will be compressed toward plenum layer 36 until the load is diminished and spread to adjacent support cells 30 and the gas pressure within the cells 30 can support the load placed thereon.
- those individual cells 30 that are located at the key pressure points of patient 24 will be compressed to a greater extent than the adjacent support cells 30 to thereby spread some of the weight load experienced by the most significantly compressed support cells 30 to the adjacent support cells 30 .
- support cells 30 are designed to spread the weight load placed on apparatus 20 by patient 24 over a larger area and facilitate the reduction of the peak support pressures experienced by the patient 24 .
- patient support layer 38 covers the full length of support structure 23 .
- a portion of layer 38 has been cutaway in FIG. 1 , however, so that the underlying support cells 30 may be illustrated.
- Layer 38 includes a layer of ticking that forms its exposed surface and may optionally include a layer of other patient support material, such as three-dimensional material or open cell urethane foam, below the ticking.
- the ticking used with structure 23 is a conventional mattress ticking material.
- suitable three-dimensional material is commercially available from Freudenberg & Co. headquartered in Weinheim an der Bergstrasse, Germany.
- thermoregulating device 20 may more readily conform to the contours of patient 24 and, when placed between patient 23 and a patient support structure 23 , facilitate the equalization of the internal air pressure of the bladders supporting patient 24 .
- FIG. 1 illustrates the use of a thermoregulating device 20 with a bed 22 , patient support structure 23 and heat exchange unit 26 .
- Various embodiments of thermoregulating device 20 i.e., devices 20 a - d , are shown in greater detail in FIGS. 2-19 .
- Each of the devices 20 a - 20 d include a flexible heat exchange layer 40 having a length 42 , a width 44 and a thickness 46 wherein both the length 42 and width 44 are significantly greater than the thickness 46 .
- the illustrated heat exchange layers 40 also all include at least one support surface 48 on which patient 24 can be supported.
- a heat exchange fluid circuit is located within layer 40 and circulates a heat exchange medium, e.g., water, to chill or warm a patient or other object placed on surface 48 .
- Illustrated devices 20 a FIGS. 2-7 ), 20 b ( FIGS. 8-12 ), and 20 d ( FIGS. 16-19 ) have heat exchange fluid circuits with elongate conduits that are formed with plastic tubes, e.g., polyvinylchloride (PVC) or polyurethane tubes, having a nominal inner diameter of about 0.25 inches (0.64 cm).
- Illustrated device 20 c FIGS. 13-15 ) has a fluid circuit formed by a bladder constructed by joining two sheets of polyurethane film together with radio frequency welds.
- water is the heat exchange medium that is circulated through the fluid circuits.
- Water enters the fluid circuit from heat exchange unit 26 through inlet port 50 and is discharged from the fluid circuit through outlet port 52 to return it to heat exchange unit 26 .
- the water is either chilled or warmed depending upon whether it is desired to chill or warm patient 24 .
- the water passes through the fluid circuit within layer 40 , it exchanges thermal energy with patient 24 .
- the water will absorb thermal energy from patient 24 thereby cooling patient 24 and warming the water.
- thermoregulating devices both above and below the patient 24 .
- two devices 20 may be employed.
- a device 20 consisting of only a heat exchange layer 40 may be placed on top of patient 24 and either a device 20 placed on top of a separate support structure 23 ( FIG. 1 ) or a device 20 that includes integral support cells 30 ( FIG. 3 ) may be placed below patient 24 .
- the illustrated heat exchange layers 40 have a length 42 and width 44 that is sufficient to cover or support the upper torso of a typical adult.
- Alternative embodiments having either longer or shorter lengths and widths may also be employed with the present invention.
- Thermoregulating device 20 a is shown in FIGS. 2 and 3 and includes a heat exchange fluid circuit 54 a located between an upper resiliently stretchable material layer 56 and a lower resiliently stretchable material layer 58 .
- Upper and lower layers 56 , 58 are resiliently stretchable, i.e., they return to their original dimensions after being stretched.
- material layers 56 , 58 may be stretched to at least about 200% of their original length or width and substantially return to their original dimensions after the force stretching the material has been removed.
- material layers 56 , 58 are manufactured with spandex fibers. More particularly, layers 56 , 58 are a fabric material manufactured with Lycra® brand spandex fibers which are commercially available from Invista, a subsidiary of Koch Industries, Inc.
- ticking layer 60 is positioned on top of upper material layer 56 in the illustrated embodiment, ticking layer 60 can be omitted in alternative embodiments.
- heat exchange fluid circuit 54 a is formed out of a flexible tubular member that has a generally serpentine shape.
- the tubular member includes a plurality of parallel linear segments 62 which are connected by arcuate portions 64 .
- Upper and lower layers 56 , 58 are stitched together to form heat exchange layer 40 .
- Stitching 66 extends between the linear segments 62 of fluid circuit 54 a to help maintain the overall configuration of fluid circuit 54 a.
- Those portions of stretchable material layers 56 , 58 located between the various segments 62 of fluid circuit 54 a act as pressure relief sections 28 a and allow fluid circuit segments 62 to move relative to each other when a patient 24 is supported on device 20 a.
- device 20 a may be integrated with a patient support structure 23 having gas- or fluid-filled support cells 30 .
- a patient support layer 38 (not illustrated in FIG. 3 but shown in part in FIG. 1 ) is located on top of layer 40 and extends downwardly to encircle both heat exchange layer 40 and support structure 23 so that the layer 40 and structure 23 form a single integral unit.
- FIGS. 4 and 5 illustrate an alternative embodiment of the serpentine heat exchange fluid circuit of FIGS. 2 and 3 wherein strips 68 of resiliently stretchable material are secured between linear segments 62 of the fluid circuit.
- Fluid circuit 54 a ′ is shown in FIG. 4 and the tubular member used to form this circuit is similar to that of fluid circuit 54 a but additionally includes outwardly extending flanges 70 .
- strips 68 extend between linear segments 62 and are stitched or otherwise removably (i.e., with Velcro) or non-removably coupled to flanges 70 .
- Strips 68 are resiliently stretchable so that they allow fluid circuit segments 62 to be repositioned when subjected to force but will return segments 62 to their original positions after the force is removed.
- material strips 68 are a spandex fiber containing fabric.
- FIGS. 6 and 7 schematically illustrate how resiliently stretchable strips 68 function.
- a force 72 applied substantially transverse to surface 48 will depress layer 40 at the location where force 72 is applied.
- strips 68 will elongate allowing layer 40 to deform into the shape shown in cross section in FIG. 7 . This will also result in the slight repositioning of segments 62 relative to each other as schematically depicted in FIG. 6 .
- strips 68 will return to their original dimensions and fluid circuit 54 a ′ will return to its generally planar configuration depicted in FIGS. 4 and 5 .
- strips 68 allow layer 40 to more readily conform to the contours of a patient 24 supported thereon.
- Thermoregulating device 20 b is best understood with reference to FIGS. 8-12 .
- Device 20 b includes an upper and lower layer 56 , 58 of resiliently stretchable material similar to device 20 a ( FIG. 8 ).
- the upper and lower layers 56 , 58 are joined with stitching 66 to form parallel extending sleeves 74 ( FIG. 9 ).
- Linear segments 62 b of flexible polymeric tubing form a part of the heat exchange fluid circuit 54 b and extend through sleeves 74 .
- FIG. 10 illustrates device 20 b in its assembled condition. Those portions of stretchable material layers 56 , 58 which are located between linear segments 62 b form pressure relief sections 28 b to allow device 20 b to adapt to the contours of patient 24 . As shown in FIG. 11 , linear segments 62 b are joined together in a parallel arrangement to form fluid circuit 54 b. FIG. 12 illustrates an alternatively configured fluid circuit 54 b ′ that connects linear fluid line segments 62 b with arcuate portions 64 b in series. FIGS. 11 and 12 are not intended to illustrate the proportionate lengths of segments 62 b.
- Thermoregulating device 20 c is best understood with reference to FIGS. 13-15 .
- Device 20 c has a heat exchange fluid circuit 54 c that is defined by a bladder 76 .
- Bladder 76 includes a plurality of slits 78 which extend through the full thickness of bladder 76 and subdivide bladder 76 into separate fluid segments 80 .
- Bladder 76 is formed by joining two sheets of polyurethane film together with water tight radio frequency welds along its outer edges 84 , 86 and along the interior perimeter of each slit 78 .
- Fluid segments 80 define a number of different possible flow paths for the water circulated between inlet 50 and outlet 52 .
- the elongate slits 78 each have an axis 82 and are arranged in a rectilinear grid pattern. In the illustrated embodiment, slits 78 are arranged parallel to either the lengthwise edges 84 and or the widthwise edges 86 of bladder 76 . Edges 84 and 86 of bladder 76 are positioned at right angles.
- Bladder 76 forms a heat exchange layer 40 by itself, however, upper and lower resiliently stretchable material layers 56 , 58 may optionally be secured to bladder 76 .
- Slits 78 function as pressure relief sections 28 c as best understood with reference to FIGS. 14 and 15 .
- slits 78 are elongated as schematically depicted in FIG. 14 .
- This differential lateral elongation of slits 78 allows layer 40 formed by bladder 76 to deform as depicted in cross section in FIG. 15 and thereby facilitate the equalization of a support pressure exerted on patient 24 .
- bladder 76 is returned to a generally planar position, slits 78 will be returned to their original configuration illustrated in FIG. 13 .
- slits 78 do not allow the total length or width of bladder 76 to be elongated, but slits 78 do allow for the local deformation of bladder 76 .
- slits 78 do allow for the local deformation of bladder 76 .
- Device 20 d includes a fluid circuit 54 d that is formed by curvilinear fluid lines 62 d , 62 d ′ arranged in a grid pattern.
- the curvilinear shape of fluid lines 62 d, 62 d ′ allows each of the nodes 88 of the grid pattern to be repositioned relative to the other nodes 88 and thereby facilitate the conformance of device 20 d to the contours of a patient 24 being supported thereon.
- Fluid circuit 54 d includes a first group of generally parallel extending fluid line segments 62 d and a second group of generally parallel extending fluid line segments 62 d ′.
- first and second groups of fluid line segments extend in substantially transverse directions and intersect at grid nodes 88 .
- Nodes 88 are formed by polymeric circular shaped tabs to which lines 62 d and 62 d ′ are each affixed. Lines 62 d, 62 d ′ may be affixed to tabs 88 by radio frequency welding, adhesives or other suitable means.
- each of the fluid line segments 62 d and 62 d ′ have an arcuate or curvilinear configuration that forms a generally sinusoidal path.
- FIG. 17 Two different configurations in which fluid line segments 62 d, 62 d ′ can be arranged to form fluid circuit 54 d are shown in FIG. 17 .
- the first configuration is depicted in solid lines and requires that the water pumped by heat exchanger 26 be divided into two flows.
- the two flows of water enter fluid circuit 54 d through a first inlet 50 and a second inlet 50 ′.
- the water entering first inlet 50 is conveyed to header line 53 a from which it enters fluid segments 62 d.
- the water After flowing through segments 62 d, where the water exchanges thermal energy with a patient 24 supported on device 20 d, the water is collected in discharge header line 53 c and then discharged through outlet 52 to return to heat exchanger unit 26 .
- the second flow of water entering fluid circuit 54 d passes through inlet 50 ′ to enter header line 53 b.
- the second flow then passes through lines 62 d ′ where it exchanges thermal energy with patient 24 and is collected in discharge header line 53 d.
- discharge header line 53 d From discharge header line 53 d, the water is discharged through outlet 52 ′ and returns to heat exchange unit 26 .
- header lines 53 a and 53 b can be joined with a corner piece 55 to form a single inlet header fed solely by inlet 50 .
- header lines 53 c and 53 d can be joined with a corner piece 55 to form a single outlet header line which discharges through a single outlet 51 .
- Fasteners 90 are used to secure a top and bottom resilient material layer 56 , 58 together on opposite sides of fluid circuit 54 d (only top layer 56 is shown in FIG. 17 ). Fasteners 90 are positioned within the open spaces defined by the grid pattern of fluid circuit 54 d to allow for the relative movement of lines 62 d, 62 d ′. Fasteners 90 can be formed by stitching the upper and lower stretchable material layers 56 , 58 together or other suitable means. The stretchable material forming layers 56 , 58 disposed about fasteners 90 and between adjacent fluid line segments form pressure relief sections 24 d.
- FIGS. 18 and 19 schematically depict how lines 62 d, 62 d ′ and nodes 88 may be relatively repositioned as device 20 d deforms when a force is applied to device 20 d .
- FIG. 18 depicts lines 62 d, 62 d ′ and nodes 88 when device 20 d is in an unstressed generally planar position. In this situation, nodes 88 are separated by a first set of distances 92 , 94 .
- each fluid line segment 62 d, 62 d ′ extending between nodes 88 has a length that is greater than the linear distance between those same nodes 88 in the unstressed position depicted in FIG. 18 and thus lines 62 d ′ and 62 d define a corresponding set of lengths greater than respective distances 92 , 94 .
- upper and lower stretchable material layers 56 , 58 and the pockets formed therebetween act as pressure relief sections 24 d and allow nodes 88 and fluid lines 62 d, 62 d ′ to be relatively repositioned as schematically depicted in FIG. 19 .
- upper fluid segment 62 d and right hand fluid segment 62 d ′ have been repositioned and have a more linear configuration and nodes 88 now define an altered set of distances 92 a , 94 a which are longer than the unstressed distances 92 , 94 .
Abstract
A thermoregulating apparatus (20) for exchanging thermal energy with a patient (24) is provided. The apparatus includes a flexible heat exchange layer (40) and a heat exchange fluid circuit (54) located within the heat exchange layer.
Description
- This application claims the benefit of U.S. Provisional Patent Application Ser. No. 60/665,141, filed Mar. 25, 2005, entitled “Expandable Thermoregulation Mat,” and claims the benefit of U.S. Provisional Patent Application Ser. No. 60/665,241, filed Mar. 25, 2005, entitled “Thermoregulating Device with Support Cells,” both of which are expressly incorporated herein by reference.
- This application is related to Patent Cooperation Treaty Application No. ______ (Attorney Docket No. 8266-1513), filed on the same date as the present application, entitled “Mattress Having Vertical Air Cells with Thermoregulation”, which claims priority to U.S. Provisional Patent Application Ser. No. 60/665,241, filed Mar. 25, 2005, entitled “Thermoregulating Device with Support Cells,” and claims the benefit of U.S. Provisional Patent Application Ser. No. 60/665,141, filed Mar. 25, 2005, entitled “Expandable Thermoregulation Mat,” which is expressly incorporated herein by reference.
- It is sometimes desirable in the treatment of a patient to either cool or warm the patient. For example, it may be clinically desirable to cool patients who have suffered a stroke or cardiac arrest. In other circumstances, such as when a patient is suffering from hypothermia, it can be desirable to warm the patient.
- Some embodiments of the invention take the form of a thermoregulating apparatus for exchanging thermal energy with a patient. The apparatus includes a flexible heat exchange layer and a heat exchange fluid circuit located within the heat exchange layer. The heat exchange layer has a length, a width and a thickness wherein the length and width are both substantially greater than the thickness. The heat exchange layer also defines at least one support surface. The heat exchange fluid circuit includes at least a first segment and a second segment. At least one pressure relief segment is located between the first and second segments of the heat exchange fluid circuit. Differential elongation of the pressure relief section relatively repositions the first and second heat exchange segments in at least one direction when a force is applied to the heat exchange layer in a direction substantially transverse to the support surface of the layer and at a location proximate the pressure relief section and the first and second fluid circuit segments.
- The pressure relief section may take the form of an opening that extends through the entire thickness of the heat exchange layer. Alternatively, a resiliently stretchable material, such as a fabric made with spandex fibers, may be used to form the pressure relief section.
- In some embodiments, the at least one pressure relief section comprises an opening extending the full thickness of the heat exchange layer.
- In some embodiments, the first and second heat exchange segments each comprise an elongate conduit. When the heat exchange layer is positioned in a substantially planar orientation at least a portion of one of the conduits defining the first and second heat exchange segments has an arcuate configuration. Differential elongation of the pressure relief section and the first and second heat exchange segments repositions at least a portion of the arcuate configuration into a more linear configuration.
- In some embodiments, the heat exchange fluid circuit comprises at least one elongate conduit arranged in a grid including a plurality of nodes. Each of the nodes defines an intersection of a first segment of the conduit with a second segment of the conduit. The first segment is fixed relative to the second segment at each node. When the heat exchange layer is positioned in a substantially planar orientation the nodes are separated by a first set of distances. The first and second segments of the conduit extend between the nodes define a second respective set of lengths, the second set of lengths are greater than the first set of distances allowing the nodes to be repositionable to define a third set of distances separating the nodes that is greater than the first set of distances.
- In some embodiments, the fluid structure comprises at least one elongate conduit. The conduit has at least one substantially serpentine portion. When the heat exchange layer is positioned in a substantially planar orientation, the serpentine portion defines a plurality of substantially parallel spaced apart linear segments. A plurality of the pressure relief sections are disposed between the linear segments of the conduit. In a further embodiment, the pressure relief sections comprise a segment of resiliently stretchable material have opposing edges. Each of the opposing edges is secured to a respective one of the linear segments.
- In some embodiments, the first and second heat exchange segments each comprise an elongate conduit. The thermoregulating apparatus further comprises at least one resiliently stretchable material layer. The at least one stretchable material layer defines a first sleeve and a second sleeve. The first and second heat exchange segments are respectively disposed within the first and second sleeves.
- In some embodiments, the thermoregulating apparatus further comprises a support structure underlying the flexible heat exchange layer. The support structure includes a plurality of gas filled support cells. In a further embodiment, the plurality of gas filled support cells comprise a plurality of substantially cylindrical cells. Each of the cells define an axis oriented substantially transverse to the support surface.
- Other embodiments of the invention take the form of a thermoregulating apparatus for exchanging thermal energy with a patient wherein the apparatus includes a flexible heat exchange layer and a heat exchange fluid circuit having an elongate conduit with a serpentine portion. The heat exchange layer has a length, a width and a thickness wherein both the length and the width are substantially greater than the thickness. The heat exchange layer also defines at least one support surface. The heat exchange fluid circuit is located within the heat exchange layer and when the heat exchange layer is in a substantially planar orientation, the serpentine portion of the fluid conduit defines a plurality of substantially parallel spaced apart linear sections connected by a plurality of arcuate sections. A stretchable material is located between the linear sections of the serpentine portion.
- In some embodiments, the heat exchange layer comprises a bladder defining the fluid circuit. The at least one slit defining an opening that extends through the bladder. In a further embodiment, the bladder comprises a plurality of the slits. In still a further embodiment, the plurality of slits are arranged in a grid pattern. In yet another embodiment, the plurality of slits define elongate openings. A first portion of the elongate openings oriented substantially parallel to a first direction and a second portion of the elongate openings oriented substantially parallel to a second direction. The first and second directions arranged at an angle of approximately 90 degrees.
- In some embodiments, the thermoregulating apparatus further comprises a support structure underlying the flexible heat exchange layer. The support structure includes a plurality of gas filled support cells. In a further embodiment, the plurality of gas filled support cells comprise a plurality of substantially cylindrical cells. Each of the cells define an axis oriented substantially transverse to the support surface.
- Yet other embodiments of the invention take the form of a thermoregulating apparatus for exchanging thermal energy with a patient that includes a flexible heat exchange layer having a first sleeve portion and a second sleeve portion. A heat exchange fluid circuit is located within the heat exchange layer and includes a first segment and a second segment which are located in the first and second sleeve portions respectively. A resiliently stretchable material is located between the first and second segments.
- In some embodiments, the flexible heat layer comprises first and second layers of the stretchable material. The heat exchange fluid circuit is disposed between the first and second layers of stretchable material.
- In some embodiments, the stretchable material comprises elongate strips of stretchable material extending between the spaced apart linear segments.
- In some embodiments, the stretchable material is resiliently stretchable to at least about 200% of its original length. In a further embodiment, the stretchable material comprises spandex fibers.
- In some embodiments, the thermoregulating apparatus further comprises a support structure underlying the flexible heat exchange layer. The support structure includes a plurality of gas filled support cells. In a further embodiment, the plurality of gas filled support cells comprise a plurality of substantially cylindrical cells. Each of the cells define an axis oriented substantially transverse to the support surface.
- In yet another embodiment, a thermoregulating apparatus for exchanging thermal energy with a patient comprises a flexible heat exchange layer, a first sleeve portion, a second sleeve portion, a heat exchange fluid circuit, and a resiliently stretchable material. The flexible heat exchange layer defines a length, a width and a thickness. Each of the length and the width are substantially greater than the thickness and the layer defines at least one support surface. The first sleeve portion and the second sleeve portion are formed within the flexible heat exchange layer. The heat exchange fluid circuit is disposed within the heat exchange layer. The heat exchange fluid circuit includes a first segment and a second segment. The first segment is disposed within the first sleeve portion and the second segment is disposed within the second sleeve portion. The resiliently stretchable material is disposed between the first segment and the second segment.
- In some embodiments, the flexible heat exchange layer comprises first and second layers of stretchable material. The first and second layers are secured together to define the first and second sleeve portions. At least one of the first and second layers define the resiliently stretchable material disposed between the first segment and the second segment.
- In some embodiments, the first sleeve portion is disposed substantially parallel to the second sleeve portion. In a further embodiment, the first and second sleeve portions are substantially linear when the flexible heat exchange layer is disposed in a planar configuration.
- In some embodiments, the stretchable material is resiliently stretchable to at least about 200% of its original length. In a further embodiment, the stretchable material comprises spandex fibers.
- In some embodiments, the thermoregulating apparatus further comprises a support structure underlying the flexible heat exchange layer. The support structure includes a plurality of gas filled support cells. In a further embodiment, the plurality of gas filled support cells comprise a plurality of substantially cylindrical cells. Each of the cells define an axis oriented substantially transverse to the support surface.
- Still other embodiments of the invention take the form of a thermoregulating apparatus for exchanging thermal energy with a patient that includes a flexible heat exchange layer and a heat exchange fluid circuit that has at least one elongate conduit arranged in a grid. The grid includes a plurality of nodes with each of the nodes defining an intersection of a first segment of the conduit with a second segment of the conduit with the first segment being fixed relative to the second segment at each node. When the heat exchange layer is positioned in a substantially planar orientation, the nodes are separated by a first set of distances and the first and second segments of the conduit extending between the nodes define a second respective set of lengths. The second set of lengths are greater than the first set of distances to thereby allow the nodes to be repositionable to define a third set of distances separating the nodes that is greater than the first set of distances.
- In some embodiments, the flexible heat exchange layer further comprises at least one layer of a resiliently stretchable material defining the support surface. The heat exchange fluid circuit is disposed proximate the layer of stretchable material. In a further embodiment, the stretchable material is resiliently stretchable to at least about 200% of its original length. In yet a further embodiment, the stretchable material comprises spandex fibers.
- In some embodiments, the first and second segments of the conduit have an arcuate configuration when the flexible heat exchange layer is in a generally planar configuration. In a further embodiment, the conduit has a portion defining a generally sinusoidal configuration.
- In some embodiments, the thermoregulating apparatus further comprises a support structure underlying the flexible heat exchange layer. The support structure includes a plurality of gas filled support cells. In a further embodiment, the plurality of gas filled support cells comprise a plurality of substantially cylindrical cells. Each of the cells define an axis oriented substantially transverse to the support surface.
- Yet another embodiment of the invention takes the form of a method of exchanging thermal energy with an object. The method includes providing a flexible heat exchange layer having a heat exchange fluid circuit disposed therein and including at least one pressure relief section and positioning an object on the heat exchange layer. The method also includes differentially resiliently elongating the flexible heat exchange layer to support the object thereon in a manner that facilitates equalization of a support pressure generated by the weight of the object and wherein a majority of the resilient elongation of the flexible heat exchange layer is defined by the pressure relief section. A heat exchange medium is circulated through the fluid circuit and thermal energy is exchanged between the object and the heat exchange medium.
- In some embodiments of the method, the object is a human.
- In some embodiments of the method, the pressure relief section is defined by an opening extending the full thickness of the heat exchange layer.
- In some embodiments of the method, the pressure relief section is formed by a resiliently stretchable material. In a further embodiment of the method, the stretchable material is resiliently stretchable to at least about 200% of its original length. In yet a further embodiment of the method, the stretchable material comprises spandex fibers.
- In some embodiments of the method, the fluid circuit includes an elongate conduit. When the heat exchange layer is in a substantially planar configuration, at least a portion of the conduit has an arcuate configuration. The step of resiliently elongating the heat exchange layer includes repositioning the portion of the conduit having an arcuate configuration into a more linear configuration.
- In some embodiments of the method, the fluid circuit includes at least one conduit arranged in a grid and having a plurality of nodes. The relative position of the nodes redefined by the step of resiliently deforming the heat exchange layer.
- In some embodiments of the method, the fluid circuit includes at least one elongate conduit having at least one serpentine portion.
- In some embodiments of the method, the method further comprises the step of providing a support structure to support the heat exchange layer and the object located thereon. The support layer includes a plurality of gas filled support cells. In a further embodiment of the method, the plurality of gas filled support cells comprise a plurality of substantially cylindrical cells.
- The detailed description particularly refers to the accompanying Figs. in which:
-
FIG. 1 is an exploded perspective view of a hospital bed, a thermoregulating device and a patient. -
FIG. 2 is an exploded perspective view of a thermoregulating device. -
FIG. 3 is a partially cut away perspective view of a thermoregulating device that has been mounted on a plurality of gas-filled support cells. -
FIG. 4 is a perspective view of a fluid circuit for a heat exchange medium mountable in a thermoregulating device. -
FIG. 5 is a detail view of a portion of the fluid circuit ofFIG. 4 . -
FIG. 6 is a schematic top view of a portion of the fluid circuit ofFIG. 5 showing its deformation under load. -
FIG. 7 is a schematic side view of the fluid circuit portion shown inFIG. 6 . -
FIG. 8 is an exploded perspective view of the upper and lower stretchable layers of a thermoregulating device. -
FIG. 9 is a partially exploded perspective view of a thermoregulating device having sleeves for receiving fluid circuit conduits. -
FIG. 10 is a perspective view of an assembled thermoregulating device similar to that shown inFIG. 9 . -
FIG. 11 is a schematic illustration of a fluid circuit that can be used with the thermoregulating device shown inFIG. 10 . -
FIG. 12 is a schematic illustration of an alternative fluid circuit that can be used with the thermoregulating device shown inFIG. 10 . -
FIG. 13 is an exploded view of another embodiment of a thermoregulating device. -
FIG. 14 is a schematic depiction of the thermoregulating device ofFIG. 13 deforming under load. -
FIG. 15 is a schematic side view of the thermoregulating device depicted inFIG. 13 . -
FIG. 16 is a perspective view of a portion of a heat exchange medium fluid circuit configured in a grid. -
FIG. 17 is a top view of a thermoregulating device including the fluid circuit grid ofFIG. 16 . -
FIG. 18 schematically shows a portion of the fluid circuit grid ofFIG. 16 in an unstressed configuration. -
FIG. 19 schematically depicts the fluid circuit portion ofFIG. 18 deformed under load. - Corresponding reference characters indicate corresponding parts throughout the several views. Although the exemplification set out herein illustrates embodiments of the invention, in several forms, the embodiments disclosed below are not intended to be exhaustive or to be construed as limiting the scope of the invention to the precise forms disclosed.
- A
thermoregulating device 20 for use with ahospital bed 22 having apatient support structure 23 is shown inFIG. 1 . A patient 24 may be supported byhospital bed 22. In the treatment ofpatient 24 it may be desirable to either chill orwarm patient 24 anddevice 20 can be employed for this purpose. A conventionalheat exchange unit 26 is coupled withdevice 20 to circulate a heat exchange medium, e.g., water, throughdevice 20.Heat exchange units 26 are well known in the art and may include a compressor, a condenser and evaporator. Water, or other heat exchange medium employed withdevice 20, may be chilled by exchanging thermal energy with the evaporator or the water may be warmed by exchanging thermal energy with the condenser. A pump located inunit 26 then circulates the water throughdevice 20. - When a patient is supported on a mattress or similar support structure it is desirable to equalize the support pressure at key pressure points on the patient (e.g., the back of the head or heals of the patient). If the pressure is not spread over a larger area of the patient at these key pressure points, the resulting pressure concentrations increase the likelihood that the patient will experience pressure ulcers or similar undesirable effects. It is known to provide patients with a patient support structure containing gas-filled chambers that facilitate the equalization of the pressure supporting the patient. Such patient support structures can be broadly categorized as powered air surfaces, non-powered air surfaces, or low air loss systems. In general, non-powered air surfaces contain air-filled chambers that do not allow the intentional loss of air from within the chambers and do not require a continuous source of air to be supplied to the chambers. The PrimeAire® ARS Pressure Relief Mattress commercially available from Hill-Rom Company, Inc. having a place of business in Batesville, Ind. is an example of such a non-powered air surface that can be used as
support structure 23. Low-air loss systems are a type of powered surface that employ air-filled chambers that are designed to allow a small quantity of air to continuously escape from the chambers during use. An air supply unit is used with such low-air loss systems to maintain the air-filled chambers at a desired pressure. The Acucair® Continuous Airflow System commercially available from Hill-Rom Company, Inc. having a place of business in Batesville, Ind. is an example of such a low-air loss system that can be used assupport structure 23. In each of these types of patient support structures, the air-filled chambers facilitate the equalization of the pressure used to support the patient and it is common to use such patient support structures to minimize the risk of pressure ulcers. - Conventional thermoregulating devices for chilling or warming a patient do not provide the pressure-equalization features of a patient support having air-filled chambers. Conventional thermoregulating devices often have strong polymeric exterior fabric covers that are not stretchable and do not readily conform to the contours of the patient being supported thereon. When using such conventional thermoregulating devices there may be pressure spikes at key pressure locations of the patient and these point loads will be suspended by the fabric cover of the device in a phenomenon known as “hammocking.” Consequently, the benefits of a patient support structure having air-filled chambers are generally not obtainable if such a conventional thermoregulating device is placed between the patient and the patient support structure.
Device 20, however, has a plurality of pressure relief sections which allowdevice 20 to more readily conform to the contour of the patient and thereby facilitate the equalization of the support pressure exerted bydevice 20 onpatient 24. In other words, it facilitates the reduction of the peak pressure the patient experiences at key pressure support locations. - The illustrated
support structure 23 has gas- or fluid-filledsupport cells 30 with a substantially cylindrical shape and vertically oriented axes 32.Support cells 30 are formed out of a polymeric material such as polyurethane and have a hollow interior volume which is filled with a gas. In the illustrated embodiment,cells 30 are filled with air.Cells 30 include a lower radial flange 31 that is welded to upper sheet 34 ofplenum layer 36 using radio frequency welding to form an air tight bond.Plenum layer 36 has an interior volume that forms an air chamber or plenum. Openings (not shown) in upper sheet 34 provide fluid communication betweenplenum 36 and each of thesupport cells 30. While thecells 30 are shown in the illustrated embodiment as cylindrically-shaped, vertically oriented air bladders, the device of the present invention may be used in cooperation with other types of air bladders including more conventional horizontally oriented bladders, or with support layers filled with other materials, such as foam or three-dimensional fibers. -
Support structure 23 may take the form of a powered or non-powered air surface, or a low air loss mattress. In any case,support cells 30 are generally non-permeable to air. In an exemplary air surface embodiment,plenum layer 36 is also non-permeable to air and, by providing fluid communication between the inner volumes of each of thesupport cells 30, maintains each of thesupport cells 30 at substantially equivalent pressures under differing load conditions. In other words, when a large load is placed onsupport structure 23, the pressure within each of thesupport cells 30 will be raised, including thosecells 30 which are not subject to the direct application of the load. - In a low air loss mattress structure, upper plenum sheet 34 permits the limited passage of air therethrough. A separate air supply is coupled to
plenum 36 to provide a continuous supply of air thereto to replenish the air lost through sheet 34 and maintainplenum 36, and thus supportcells 30, at a desired pressure. The flow of air towardpatient 24 generated by the loss of air through upper sheet 34 beneficially removes moisture from those portions ofdevice 20 in direct contact withpatient 24. - In powered, non-powered, and low air loss embodiments, each
individual support cell 30 compresses to an extent that is determined by the load placed on it. Weight loads placed ondevice 20 are transferred throughdevice 20 and any intervening material layers to supportcells 30.Support structure 23 includes apatient support layer 38 that is sufficiently loose and flexible so that when apatient 24 is supported onlayer 38,layer 38 will generally conform to the body ofpatient 24 as it transfers the weight ofpatient 24 to supportcells 30.Support cells 30 are gas-filled and the interior space ofcells 30 are interconnected so that the pressure of the gas in each of thecells 30 of the mattress or a particular zone of the mattress (i.e., a head section, seat section, or foot section) remains substantially equal. Thus, as the weight ofpatient 24 is supported byindividual support cells 30, thosecells 30 which have a particularly high load initially placed thereon will be compressed towardplenum layer 36 until the load is diminished and spread toadjacent support cells 30 and the gas pressure within thecells 30 can support the load placed thereon. Thoseindividual cells 30 that are located at the key pressure points ofpatient 24 will be compressed to a greater extent than theadjacent support cells 30 to thereby spread some of the weight load experienced by the most significantly compressedsupport cells 30 to theadjacent support cells 30. By this differential compression of theindividual support cells 30,support cells 30 are designed to spread the weight load placed onapparatus 20 bypatient 24 over a larger area and facilitate the reduction of the peak support pressures experienced by thepatient 24. - As illustrated,
patient support layer 38 covers the full length ofsupport structure 23. A portion oflayer 38 has been cutaway inFIG. 1 , however, so that theunderlying support cells 30 may be illustrated.Layer 38 includes a layer of ticking that forms its exposed surface and may optionally include a layer of other patient support material, such as three-dimensional material or open cell urethane foam, below the ticking. The ticking used withstructure 23 is a conventional mattress ticking material. One example of suitable three-dimensional material is commercially available from Freudenberg & Co. headquartered in Weinheim an der Bergstrasse, Germany. - By providing
thermoregulating device 20 with pressure relief sections which allow for the resilient stretching ofdevice 20,device 20 may more readily conform to the contours ofpatient 24 and, when placed betweenpatient 23 and apatient support structure 23, facilitate the equalization of the internal air pressure of thebladders supporting patient 24. -
FIG. 1 illustrates the use of athermoregulating device 20 with abed 22,patient support structure 23 andheat exchange unit 26. Various embodiments ofthermoregulating device 20, i.e.,devices 20 a-d, are shown in greater detail inFIGS. 2-19 . Each of thedevices 20 a-20 d include a flexibleheat exchange layer 40 having alength 42, awidth 44 and athickness 46 wherein both thelength 42 andwidth 44 are significantly greater than thethickness 46. The illustrated heat exchange layers 40 also all include at least onesupport surface 48 on whichpatient 24 can be supported. - A heat exchange fluid circuit is located within
layer 40 and circulates a heat exchange medium, e.g., water, to chill or warm a patient or other object placed onsurface 48.Illustrated devices 20 a (FIGS. 2-7 ), 20 b (FIGS. 8-12 ), and 20 d (FIGS. 16-19 ) have heat exchange fluid circuits with elongate conduits that are formed with plastic tubes, e.g., polyvinylchloride (PVC) or polyurethane tubes, having a nominal inner diameter of about 0.25 inches (0.64 cm).Illustrated device 20 c (FIGS. 13-15 ) has a fluid circuit formed by a bladder constructed by joining two sheets of polyurethane film together with radio frequency welds. - In the illustrated embodiments, water is the heat exchange medium that is circulated through the fluid circuits. Water enters the fluid circuit from
heat exchange unit 26 throughinlet port 50 and is discharged from the fluid circuit throughoutlet port 52 to return it to heatexchange unit 26. Inunit 26, the water is either chilled or warmed depending upon whether it is desired to chill orwarm patient 24. As the water passes through the fluid circuit withinlayer 40, it exchanges thermal energy withpatient 24. For example, ifunit 26 is used to chill the water, the water will absorb thermal energy frompatient 24 thereby coolingpatient 24 and warming the water. - In some situations it may be desirable to place thermoregulating devices both above and below the
patient 24. In such situations, twodevices 20 may be employed. For example, adevice 20 consisting of only aheat exchange layer 40 may be placed on top ofpatient 24 and either adevice 20 placed on top of a separate support structure 23 (FIG. 1 ) or adevice 20 that includes integral support cells 30 (FIG. 3 ) may be placed belowpatient 24. - In most situations where it is desired to chill or warm a patient, it is the upper torso of the patient which is of primary concern and the illustrated heat exchange layers 40 have a
length 42 andwidth 44 that is sufficient to cover or support the upper torso of a typical adult. Alternative embodiments having either longer or shorter lengths and widths may also be employed with the present invention. -
Thermoregulating device 20 a is shown inFIGS. 2 and 3 and includes a heatexchange fluid circuit 54 a located between an upper resilientlystretchable material layer 56 and a lower resilientlystretchable material layer 58. Upper andlower layers ticking layer 60 is positioned on top ofupper material layer 56 in the illustrated embodiment, tickinglayer 60 can be omitted in alternative embodiments. - As seen in
FIGS. 2 and 3 heatexchange fluid circuit 54 a is formed out of a flexible tubular member that has a generally serpentine shape. The tubular member includes a plurality of parallellinear segments 62 which are connected byarcuate portions 64. Upper andlower layers heat exchange layer 40.Stitching 66 extends between thelinear segments 62 offluid circuit 54 a to help maintain the overall configuration offluid circuit 54 a. Those portions of stretchable material layers 56, 58 located between thevarious segments 62 offluid circuit 54 a, however, act aspressure relief sections 28 a and allowfluid circuit segments 62 to move relative to each other when apatient 24 is supported ondevice 20 a. - As illustrated in
FIG. 3 ,device 20 a may be integrated with apatient support structure 23 having gas- or fluid-filledsupport cells 30. For the structure ofFIG. 3 , a patient support layer 38 (not illustrated inFIG. 3 but shown in part inFIG. 1 ) is located on top oflayer 40 and extends downwardly to encircle bothheat exchange layer 40 andsupport structure 23 so that thelayer 40 andstructure 23 form a single integral unit. -
FIGS. 4 and 5 illustrate an alternative embodiment of the serpentine heat exchange fluid circuit ofFIGS. 2 and 3 wherein strips 68 of resiliently stretchable material are secured betweenlinear segments 62 of the fluid circuit.Fluid circuit 54 a′ is shown inFIG. 4 and the tubular member used to form this circuit is similar to that offluid circuit 54 a but additionally includes outwardly extendingflanges 70. As seen inFIG. 5 , strips 68 extend betweenlinear segments 62 and are stitched or otherwise removably (i.e., with Velcro) or non-removably coupled toflanges 70.Strips 68 are resiliently stretchable so that they allowfluid circuit segments 62 to be repositioned when subjected to force but will returnsegments 62 to their original positions after the force is removed. In the illustrated embodiment, material strips 68 are a spandex fiber containing fabric. -
FIGS. 6 and 7 schematically illustrate how resilientlystretchable strips 68 function. Aforce 72 applied substantially transverse to surface 48 will depresslayer 40 at the location whereforce 72 is applied. Under the application offorce 72, strips 68 will elongate allowinglayer 40 to deform into the shape shown in cross section inFIG. 7 . This will also result in the slight repositioning ofsegments 62 relative to each other as schematically depicted inFIG. 6 . Onceforce 72 is removed, strips 68 will return to their original dimensions andfluid circuit 54 a′ will return to its generally planar configuration depicted inFIGS. 4 and 5 . By facilitating this deformation oflayer 40, strips 68 allowlayer 40 to more readily conform to the contours of a patient 24 supported thereon. -
Thermoregulating device 20 b is best understood with reference toFIGS. 8-12 .Device 20 b includes an upper andlower layer device 20 a (FIG. 8 ). The upper andlower layers FIG. 9 ).Linear segments 62 b of flexible polymeric tubing form a part of the heatexchange fluid circuit 54 b and extend throughsleeves 74. -
FIG. 10 illustratesdevice 20 b in its assembled condition. Those portions of stretchable material layers 56, 58 which are located betweenlinear segments 62 b formpressure relief sections 28 b to allowdevice 20 b to adapt to the contours ofpatient 24. As shown inFIG. 11 ,linear segments 62 b are joined together in a parallel arrangement to formfluid circuit 54 b.FIG. 12 illustrates an alternatively configuredfluid circuit 54 b′ that connects linearfluid line segments 62 b witharcuate portions 64 b in series.FIGS. 11 and 12 are not intended to illustrate the proportionate lengths ofsegments 62 b. -
Thermoregulating device 20 c is best understood with reference toFIGS. 13-15 .Device 20 c has a heatexchange fluid circuit 54 c that is defined by abladder 76.Bladder 76 includes a plurality ofslits 78 which extend through the full thickness ofbladder 76 and subdividebladder 76 into separatefluid segments 80.Bladder 76 is formed by joining two sheets of polyurethane film together with water tight radio frequency welds along itsouter edges -
Fluid segments 80 define a number of different possible flow paths for the water circulated betweeninlet 50 andoutlet 52. The elongate slits 78 each have anaxis 82 and are arranged in a rectilinear grid pattern. In the illustrated embodiment, slits 78 are arranged parallel to either thelengthwise edges 84 and or thewidthwise edges 86 ofbladder 76.Edges bladder 76 are positioned at right angles.Bladder 76 forms aheat exchange layer 40 by itself, however, upper and lower resiliently stretchable material layers 56, 58 may optionally be secured tobladder 76. -
Slits 78 function aspressure relief sections 28 c as best understood with reference toFIGS. 14 and 15 . When aforce 72 is applied atlocation 72 a substantially transverse to supportsurface 48, slits 78 are elongated as schematically depicted inFIG. 14 . This differential lateral elongation ofslits 78 allowslayer 40 formed bybladder 76 to deform as depicted in cross section inFIG. 15 and thereby facilitate the equalization of a support pressure exerted onpatient 24. Whenbladder 76 is returned to a generally planar position, slits 78 will be returned to their original configuration illustrated inFIG. 13 . - It is noted that
slits 78 do not allow the total length or width ofbladder 76 to be elongated, but slits 78 do allow for the local deformation ofbladder 76. When relieving support pressure spikes at key pressure locations onpatient 24, local deformation of the supporting layer at the key pressure locations can facilitate the reduction of the support pressure spike even when the total length or width of bladder is not elongated or otherwise altered. -
Thermoregulating device 20 d is best understood with reference toFIGS. 16-19 .Device 20 d includes afluid circuit 54 d that is formed bycurvilinear fluid lines fluid lines nodes 88 of the grid pattern to be repositioned relative to theother nodes 88 and thereby facilitate the conformance ofdevice 20 d to the contours of a patient 24 being supported thereon.Fluid circuit 54 d includes a first group of generally parallel extendingfluid line segments 62 d and a second group of generally parallel extendingfluid line segments 62 d′. These first and second groups of fluid line segments extend in substantially transverse directions and intersect atgrid nodes 88.Nodes 88 are formed by polymeric circular shaped tabs to which lines 62 d and 62 d′ are each affixed.Lines tabs 88 by radio frequency welding, adhesives or other suitable means. As best seen inFIGS. 16 and 17 , each of thefluid line segments - Two different configurations in which
fluid line segments fluid circuit 54 d are shown inFIG. 17 . The first configuration is depicted in solid lines and requires that the water pumped byheat exchanger 26 be divided into two flows. The two flows of water enterfluid circuit 54 d through afirst inlet 50 and asecond inlet 50′. The water enteringfirst inlet 50 is conveyed toheader line 53 a from which it entersfluid segments 62 d. After flowing throughsegments 62 d, where the water exchanges thermal energy with a patient 24 supported ondevice 20 d, the water is collected indischarge header line 53 c and then discharged throughoutlet 52 to return toheat exchanger unit 26. The second flow of water enteringfluid circuit 54 d passes throughinlet 50′ to enterheader line 53 b. The second flow then passes throughlines 62 d′ where it exchanges thermal energy withpatient 24 and is collected indischarge header line 53 d. Fromdischarge header line 53 d, the water is discharged throughoutlet 52′ and returns to heatexchange unit 26. - In an alternative configuration of
fluid circuit 54 d,header lines corner piece 55 to form a single inlet header fed solely byinlet 50. Similarly,header lines corner piece 55 to form a single outlet header line which discharges through asingle outlet 51. -
Fasteners 90 are used to secure a top and bottomresilient material layer fluid circuit 54 d (onlytop layer 56 is shown inFIG. 17 ).Fasteners 90 are positioned within the open spaces defined by the grid pattern offluid circuit 54 d to allow for the relative movement oflines Fasteners 90 can be formed by stitching the upper and lower stretchable material layers 56, 58 together or other suitable means. The stretchablematerial forming layers fasteners 90 and between adjacent fluid line segments form pressure relief sections 24 d. -
FIGS. 18 and 19 schematically depict howlines nodes 88 may be relatively repositioned asdevice 20 d deforms when a force is applied todevice 20 d.FIG. 18 depictslines nodes 88 whendevice 20 d is in an unstressed generally planar position. In this situation,nodes 88 are separated by a first set ofdistances fluid line segments fluid line segment nodes 88 has a length that is greater than the linear distance between thosesame nodes 88 in the unstressed position depicted inFIG. 18 and thus lines 62 d′ and 62 d define a corresponding set of lengths greater thanrespective distances - When
device 20 d is deformed by the application of a force, upper and lower stretchable material layers 56, 58 and the pockets formed therebetween act as pressure relief sections 24 d and allownodes 88 andfluid lines FIG. 19 . As seen inFIG. 19 ,upper fluid segment 62 d and righthand fluid segment 62 d′ have been repositioned and have a more linear configuration andnodes 88 now define an altered set ofdistances unstressed distances - The present invention has been described with reference to certain exemplary embodiments, variations, and applications. However, it is understood that the present invention is defined by the appended claims. It may be modified within the spirit and scope of this disclosure. This disclosure is therefore intended to cover any and all variations, uses, or adaptations of the present invention using its general principles.
Claims (51)
1. A thermoregulating apparatus for exchanging thermal energy with a patient, the apparatus comprising:
a flexible heat exchange layer, the heat exchange layer defining a length, a width and a thickness, each of the length and the width being substantially greater than the thickness and wherein the layer defines at least one support surface;
a heat exchange fluid circuit disposed within the heat exchange layer, the heat exchange fluid circuit defining at least first and second heat exchange segments; and
at least one pressure relief section disposed between the first and second heat exchange segments wherein elongation of the pressure relief section relatively repositions the first and second heat exchange segments in at least one direction upon application of a force to the heat exchange layer in a direction substantially transverse to the support surface proximate the first and second heat exchange segments and the pressure relief section.
2. The apparatus of claim 1 wherein the at least one pressure relief section comprises an opening extending the full thickness of the heat exchange layer.
3. The apparatus of claim 1 wherein the at least one pressure relief section comprises a resiliently stretchable material.
4. The apparatus of claim 1 wherein the first and second heat exchange segments each comprise an elongate conduit wherein, when the heat exchange layer is positioned in a substantially planar orientation, at least a portion of one of the conduits defining the first and second heat exchange segments has an arcuate configuration, and wherein differential elongation of the pressure relief section and the first and second heat exchange segments repositions at least a portion of the arcuate configuration into a more linear configuration.
5. The apparatus of claim 1 wherein the heat exchange fluid circuit comprises at least one elongate conduit arranged in a grid, the grid including a plurality of nodes 88, each of the nodes defining an intersection of a first segment of the conduit with a second segment of the conduit with the first segment being fixed relative to the second segment at each the node, and wherein, when the heat exchange layer is positioned in a substantially planar orientation, the nodes are separated by a first set of distances and the first and second segments of the conduit extending between the nodes define a second respective set of lengths, the second set of lengths being greater than the first set of distances thereby allowing the nodes to be repositionable to define a third set of distances separating the nodes that is greater than the first set of distances.
6. The apparatus of claim 1 wherein the fluid structure comprises at least one elongate conduit, the conduit having at least one substantially serpentine portion wherein, when the heat exchange layer is positioned in a substantially planar orientation, the serpentine portion defines a plurality of substantially parallel spaced apart linear segments and wherein a plurality of the pressure relief sections are disposed between the linear segments of the conduit.
7. The apparatus of claim 6 wherein the pressure relief sections comprise a segment of resiliently stretchable material have opposing edges, each of the opposing edges being secured to a respective one of the linear segments.
8. The apparatus of claim 1 wherein the first and second heat exchange segments each comprise an elongate conduit, and wherein the apparatus further comprises at least one resiliently stretchable material layer, the at least one stretchable material layer defining a first sleeve and a second sleeve wherein the first and second heat exchange segments are respectively disposed within the first and second sleeves.
9. The apparatus of claim 1 further comprising a support structure underlying the flexible heat exchange layer, the support structure including a plurality of gas filled support cells.
10. The apparatus of claim 9 wherein the plurality of gas filled support cells comprise a plurality of substantially cylindrical cells, each of the cells defining an axis oriented substantially transverse to the support surface.
11. A thermoregulating apparatus for exchanging thermal energy with a patient, the apparatus comprising:
a flexible heat exchange layer, the heat exchange layer defining a length, a width and a thickness, each of the length and the width being substantially greater than the thickness and wherein the layer defines at least one support surface;
a heat exchange fluid circuit disposed within the heat exchange layer, the heat exchange fluid circuit defining at least a first and a second heat exchange segment; and
at least one slit extending through the heat exchange layer and separating the first and second heat exchange segment.
12. The apparatus of claim 11 wherein the heat exchange layer comprises a bladder defining the fluid circuit, the at least one slit defining an opening that extends through the bladder.
13. The apparatus of claim 12 wherein the bladder comprises a plurality of the slits.
14. The apparatus of claim 13 wherein the plurality of slits are arranged in a grid pattern.
15. The apparatus of claim 14 wherein the plurality of slits define elongate openings, a first portion of the elongate openings oriented substantially parallel to a first direction and a second portion of the elongate openings oriented substantially parallel to a second direction, the first and second directions arranged at an angle of approximately 90 degrees.
16. The apparatus of claim 11 further comprising a support structure underlying the flexible heat exchange layer, the support structure including a plurality of gas filled support cells.
17. The apparatus of claim 16 wherein the plurality of gas filled support cells comprise a plurality of substantially cylindrical cells, each of the cells defining an axis oriented substantially transverse to the support surface.
18. A thermoregulating apparatus for exchanging thermal energy with a patient, the apparatus comprising:
a flexible heat exchange layer, the heat exchange layer defining a length, a width and a thickness, each of the length and the width being substantially greater than the thickness and wherein the layer defines at least one support surface;
a heat exchange fluid circuit disposed within the heat exchange layer, the heat exchange fluid circuit including an elongate conduit wherein, when the heat exchange layer is positioned in a substantially planar orientation, the conduit has a serpentine portion, the serpentine portion defining a plurality of substantially parallel spaced apart linear segments connected by a plurality of arcuate segments; and
a resiliently stretchable material disposed between the linear segments of the serpentine portion.
19. The apparatus of claim 18 wherein the flexible heat layer comprises first and second layers of the stretchable material, the heat exchange fluid circuit disposed between the first and second layers of stretchable material.
20. The apparatus of claim 18 wherein the stretchable material comprises elongate strips of stretchable material extending between the spaced apart linear segments.
21. The apparatus of claim 18 wherein the stretchable material is resiliently stretchable to at least about 200% of its original length.
22. The apparatus of claim 21 wherein the stretchable material comprises spandex fibers.
23. The apparatus of claim 18 further comprising a support structure underlying the flexible heat exchange layer, the support structure including a plurality of gas filled support cells.
24. The apparatus of claim 23 wherein the plurality of gas filled support cells comprise a plurality of substantially cylindrical cells, each of the cells defining an axis oriented substantially transverse to the support surface.
25. A thermoregulating apparatus for exchanging thermal energy with a patient, the apparatus comprising:
a flexible heat exchange layer, the heat exchange layer defining a length, a width and a thickness, each of the length and the width being substantially greater than the thickness and wherein the layer defines at least one support surface;
a first sleeve portion and a second sleeve portion formed within the flexible heat exchange layer;
a heat exchange fluid circuit disposed within the heat exchange layer, the heat exchange fluid circuit including a first segment and a second segment, the first segment disposed within the first sleeve portion and the second segment disposed within the second sleeve portion; and
a resiliently stretchable material disposed between the first segment and the second segment.
26. The apparatus of claim 25 wherein the flexible heat exchange layer comprises first and second layers of stretchable material, the first and second layers secured together to define the first and second sleeve portions and wherein at least one of the first and second layers define the resiliently stretchable material disposed between the first segment and the second segment.
27. The apparatus of claim 25 wherein the first sleeve portion is disposed substantially parallel to the second sleeve portion.
28. The apparatus of claim 27 wherein the first and second sleeve portions are substantially linear when the flexible heat exchange layer is disposed in a planar configuration.
29. The apparatus of claim 25 wherein the stretchable material is resiliently stretchable to at least about 200% of its original length.
30. The apparatus of claim 29 wherein the stretchable material comprises spandex fibers.
31. The apparatus of claim 25 further comprising a support structure underlying the flexible heat exchange layer, the support structure including a plurality of gas filled support cells.
32. The apparatus of claim 31 wherein the plurality of gas filled support cells comprise a plurality of substantially cylindrical cells, each of the cells defining an axis oriented substantially transverse to the support surface.
33. A thermoregulating apparatus for exchanging thermal energy with a patient, the apparatus comprising:
a flexible heat exchange layer, the heat exchange layer defining a length, a width and a thickness, each of the length and the width being substantially greater than the thickness and wherein the heat exchange layer defines at least one support surface; and
a heat exchange fluid circuit disposed within the heat exchange layer, the fluid circuit including at least one elongate conduit arranged in a grid, the grid including a plurality of nodes, each of the nodes defining an intersection of a first segment of the conduit with a second segment of the conduit with the first segment being fixed relative to the second segment at each the node, and wherein, when the heat exchange layer is positioned in a substantially planar orientation, the nodes are separated by a first set of distances and the first and second segments of the conduit extending between the nodes define a second respective set of lengths, the second set of lengths being greater than the first set of distances thereby allowing the nodes to be repositionable to define a third set of distances separating the nodes that is greater than the first set of distances.
34. The apparatus of claim 33 wherein the flexible heat exchange layer further comprises at least one layer of a resiliently stretchable material defining the support surface, the heat exchange fluid circuit disposed proximate the layer of stretchable material.
35. The apparatus of claim 34 wherein the stretchable material is resiliently stretchable to at least about 200% of its original length.
36. The apparatus of claim 35 wherein the stretchable material comprises spandex fibers.
37. The apparatus of claim 33 wherein the first and second segments of the conduit have an arcuate configuration when the flexible heat exchange layer is in a generally planar configuration.
38. The apparatus of claim 37 wherein the conduit has a portion defining a generally sinusoidal configuration.
39. The apparatus of claim 33 further comprising a support structure underlying the flexible heat exchange layer, the support structure including a plurality of gas filled support cells.
40. The apparatus of claim 39 wherein the plurality of gas filled support cells comprise a plurality of substantially cylindrical cells, each of the cells defining an axis oriented substantially transverse to the support surface.
41. A method of exchanging thermal energy with an object, the method comprising:
providing a flexible heat exchange layer having a heat exchange fluid circuit disposed therein and including at least one pressure relief section;
positioning an object on the heat exchange layer;
differentially resiliently elongating the flexible heat exchange layer to support the object thereon in a manner that facilitates equalization of a support pressure generated by the weight of the object and wherein a majority of the resilient elongation of the flexible heat exchange layer is defined by the pressure relief section;
circulating a heat exchange medium through the fluid circuit; and
exchanging thermal energy between the object and the heat exchange medium.
42. The method of claim 41 wherein the object is a human.
43. The method of claim 41 wherein the pressure relief section is defined by an opening extending the full thickness of the heat exchange layer.
44. The method of claim 41 wherein the pressure relief section is formed by a resiliently stretchable material.
45. The method of claim 44 wherein the stretchable material is resiliently stretchable to at least about 200% of its original length.
46. The method of claim 45 wherein the stretchable material comprises spandex fibers.
47. The method of claim 41 wherein the fluid circuit includes an elongate conduit wherein, when the heat exchange layer is in a substantially planar configuration, at least a portion of the conduit has an arcuate configuration, and the step of resiliently elongating the heat exchange layer includes repositioning the portion of the conduit having an arcuate configuration into a more linear configuration.
48. The method of claim 41 wherein the fluid circuit includes at least one conduit arranged in a grid and having a plurality of nodes, the relative position of the nodes being redefined by the step of resiliently deforming the heat exchange layer.
49. The method of claim 41 wherein the fluid circuit includes at least one elongate conduit having at least one serpentine portion.
50. The method of claim 41 further comprising the step of providing a support structure to support the heat exchange layer and the object located thereon, the support layer including a plurality of gas filled support cells.
51. The method of claim 50 wherein the plurality of gas filled support cells comprise a plurality of substantially cylindrical cells.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/909,240 US20100057169A1 (en) | 2005-03-25 | 2006-03-24 | Thermoregulation device |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US66524105P | 2005-03-25 | 2005-03-25 | |
US66514105P | 2005-03-25 | 2005-03-25 | |
PCT/US2006/010805 WO2006102598A2 (en) | 2005-03-25 | 2006-03-24 | Thermoregulation device |
US11/909,240 US20100057169A1 (en) | 2005-03-25 | 2006-03-24 | Thermoregulation device |
Publications (1)
Publication Number | Publication Date |
---|---|
US20100057169A1 true US20100057169A1 (en) | 2010-03-04 |
Family
ID=37024679
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/909,178 Expired - Fee Related US7921488B2 (en) | 2005-03-25 | 2006-03-24 | Mattress having vertical air cells with thermoregulation |
US11/909,240 Abandoned US20100057169A1 (en) | 2005-03-25 | 2006-03-24 | Thermoregulation device |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/909,178 Expired - Fee Related US7921488B2 (en) | 2005-03-25 | 2006-03-24 | Mattress having vertical air cells with thermoregulation |
Country Status (5)
Country | Link |
---|---|
US (2) | US7921488B2 (en) |
EP (2) | EP1865895A4 (en) |
JP (2) | JP2008534077A (en) |
AU (2) | AU2006269702A1 (en) |
WO (2) | WO2007008260A2 (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100205739A1 (en) * | 2001-05-25 | 2010-08-19 | Gallant Dennis J | Thermoregulation equipment for patient room |
US8397326B2 (en) | 2010-02-05 | 2013-03-19 | Stryker Corporation | Patient/invalid handling support |
US8910334B2 (en) | 2008-12-17 | 2014-12-16 | Stryker Corporation | Patient support |
USD792974S1 (en) * | 2013-03-04 | 2017-07-25 | SEIRATHERM GmbH | Equipment cart |
US9782312B2 (en) | 2013-09-05 | 2017-10-10 | Stryker Corporation | Patient support |
US9820904B2 (en) | 2011-07-13 | 2017-11-21 | Stryker Corporation | Patient/invalid handling support |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5339873B2 (en) * | 2008-12-01 | 2013-11-13 | 日立マクセル株式会社 | Air mat |
WO2011049744A2 (en) * | 2009-10-20 | 2011-04-28 | Stryker Corporation | Microclimate management system |
US10219725B2 (en) * | 2012-09-04 | 2019-03-05 | Hill-Rom Services, Inc. | Patient mobility surface assessment system and method |
EP3033541B1 (en) * | 2013-09-11 | 2019-01-16 | Skydex Technologies, Inc. | Linked arrays of void cells |
EP4185208A4 (en) | 2020-07-24 | 2023-11-29 | Profound Medical Inc. | Configurable patient support for ultrasound therapy |
CN112603639B (en) * | 2020-12-30 | 2022-07-19 | 吉林大学第一医院 | Temperature control device for cardiac surgery nursing |
Citations (25)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2110022A (en) * | 1935-07-15 | 1938-03-01 | Internat Engineering Corp | Cover |
US2250325A (en) * | 1938-10-12 | 1941-07-22 | Eugene L Barnes | Thermal device |
US3295594A (en) * | 1964-09-03 | 1967-01-03 | United Aircraft Corp | Thermal garment |
US3714947A (en) * | 1971-02-11 | 1973-02-06 | Angelica Corp | Hypothermia baby bunting |
US4114620A (en) * | 1977-03-02 | 1978-09-19 | Moore-Perk Corporation | Patient treatment pad for hot or cold use |
US4149541A (en) * | 1977-10-06 | 1979-04-17 | Moore-Perk Corporation | Fluid circulating pad |
US4523594A (en) * | 1982-02-12 | 1985-06-18 | Lawrence Kuznetz | Stretchable textile heat-exchange jacket |
US4660388A (en) * | 1984-05-24 | 1987-04-28 | Greene Jr George J | Cooling cover |
US4884304A (en) * | 1988-09-28 | 1989-12-05 | Life Support Systems, Inc. | Bedding system with selective heating and cooling |
US5251689A (en) * | 1990-01-05 | 1993-10-12 | Solkav Solartechnik Gesellschaft M.B.H. | Rollable heat exchanger |
US5320164A (en) * | 1992-12-10 | 1994-06-14 | The United States Of America As Represented By The Secretary Of The Army | Body heating and cooling garment |
US5324320A (en) * | 1987-10-05 | 1994-06-28 | Augustine Medical, Inc. | Thermal blanket |
US5755275A (en) * | 1995-01-25 | 1998-05-26 | Delta Temax Inc. | Tubed lamination heat transfer articles and method of manufacture |
US5989285A (en) * | 1996-08-15 | 1999-11-23 | Thermotek, Inc. | Temperature controlled blankets and bedding assemblies |
US6354099B1 (en) * | 2000-04-11 | 2002-03-12 | Augustine Medical, Inc. | Cooling devices with high-efficiency cooling features |
US6371976B1 (en) * | 1996-11-25 | 2002-04-16 | Kci Licensing, Inc. | Body temperature control for use with patient supports |
US6375674B1 (en) * | 1999-01-04 | 2002-04-23 | Medivance, Inc. | Cooling/heating pad and system |
US6493889B2 (en) * | 2001-01-29 | 2002-12-17 | Project Cool Air, Inc. | Cooling cover apparatus |
US6565699B1 (en) * | 2000-10-19 | 2003-05-20 | The United States Of America As Represented By The Secretary Of The Army | Method and apparatus for making body heating and cooling garments |
US6606754B1 (en) * | 1999-03-30 | 2003-08-19 | Gaymar Industries, Inc. | Supported hypo/hyperthermia pad |
US6827128B2 (en) * | 2002-05-20 | 2004-12-07 | The Board Of Trustees Of The University Of Illinois | Flexible microchannel heat exchanger |
US6942015B1 (en) * | 2000-10-05 | 2005-09-13 | Jenkins Comfort Systems, Llc | Body heating/cooling apparatus |
US6945987B2 (en) * | 2002-11-08 | 2005-09-20 | Kci Licensing, Inc. | Patient cooling system |
US6944987B2 (en) * | 2000-08-25 | 2005-09-20 | Van Loef Marko J G | Fishing device suitable for cooperating with a fishing rod |
US7243703B2 (en) * | 2002-07-29 | 2007-07-17 | Ube Industries, Ltd. | Flexible heat exchanger |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1121277A (en) * | 1913-12-04 | 1914-12-15 | Theresa C Mitchell | Warming appliance for beds. |
US2932491A (en) * | 1957-10-03 | 1960-04-12 | Gen Motors Corp | Heat transfer unit |
US4749541A (en) * | 1986-12-05 | 1988-06-07 | Westinghouse Electric Corp. | Position sensing mechanism for a nuclear fuel transfer system |
US4864671A (en) * | 1988-03-28 | 1989-09-12 | Decubitus, Inc. | Controllably inflatable cushion |
US5379471A (en) * | 1991-01-28 | 1995-01-10 | Holdredge; Terry K. | Pneumatic wheel chair cushion for reducing ischemic injury |
US5592706A (en) * | 1993-11-09 | 1997-01-14 | Teksource, Lc | Cushioning device formed from separate reshapable cells |
GB9610233D0 (en) * | 1996-05-16 | 1996-07-24 | Kci Medical Ltd | Mattress cooling system |
US6855158B2 (en) * | 2001-09-11 | 2005-02-15 | Hill-Rom Services, Inc. | Thermo-regulating patient support structure |
JP2006503649A (en) * | 2002-10-23 | 2006-02-02 | ティーシーエーエム テクノロジーズ, インコーポレイテッド | Anti-decubitus mat with advanced functions |
-
2006
- 2006-03-24 EP EP06739570.7A patent/EP1865895A4/en not_active Withdrawn
- 2006-03-24 WO PCT/US2006/010857 patent/WO2007008260A2/en active Application Filing
- 2006-03-24 AU AU2006269702A patent/AU2006269702A1/en not_active Abandoned
- 2006-03-24 JP JP2008503228A patent/JP2008534077A/en active Pending
- 2006-03-24 EP EP06758192.6A patent/EP1865814B1/en active Active
- 2006-03-24 US US11/909,178 patent/US7921488B2/en not_active Expired - Fee Related
- 2006-03-24 JP JP2008503240A patent/JP2008534079A/en active Pending
- 2006-03-24 US US11/909,240 patent/US20100057169A1/en not_active Abandoned
- 2006-03-24 WO PCT/US2006/010805 patent/WO2006102598A2/en active Application Filing
- 2006-03-24 AU AU2006226813A patent/AU2006226813A1/en not_active Abandoned
Patent Citations (27)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2110022A (en) * | 1935-07-15 | 1938-03-01 | Internat Engineering Corp | Cover |
US2250325A (en) * | 1938-10-12 | 1941-07-22 | Eugene L Barnes | Thermal device |
US3295594A (en) * | 1964-09-03 | 1967-01-03 | United Aircraft Corp | Thermal garment |
US3714947A (en) * | 1971-02-11 | 1973-02-06 | Angelica Corp | Hypothermia baby bunting |
US4114620A (en) * | 1977-03-02 | 1978-09-19 | Moore-Perk Corporation | Patient treatment pad for hot or cold use |
US4149541A (en) * | 1977-10-06 | 1979-04-17 | Moore-Perk Corporation | Fluid circulating pad |
US4523594A (en) * | 1982-02-12 | 1985-06-18 | Lawrence Kuznetz | Stretchable textile heat-exchange jacket |
US4660388A (en) * | 1984-05-24 | 1987-04-28 | Greene Jr George J | Cooling cover |
US5324320A (en) * | 1987-10-05 | 1994-06-28 | Augustine Medical, Inc. | Thermal blanket |
US4884304A (en) * | 1988-09-28 | 1989-12-05 | Life Support Systems, Inc. | Bedding system with selective heating and cooling |
US5251689A (en) * | 1990-01-05 | 1993-10-12 | Solkav Solartechnik Gesellschaft M.B.H. | Rollable heat exchanger |
US5320164A (en) * | 1992-12-10 | 1994-06-14 | The United States Of America As Represented By The Secretary Of The Army | Body heating and cooling garment |
US5755275A (en) * | 1995-01-25 | 1998-05-26 | Delta Temax Inc. | Tubed lamination heat transfer articles and method of manufacture |
US5989285A (en) * | 1996-08-15 | 1999-11-23 | Thermotek, Inc. | Temperature controlled blankets and bedding assemblies |
US6371976B1 (en) * | 1996-11-25 | 2002-04-16 | Kci Licensing, Inc. | Body temperature control for use with patient supports |
US6375674B1 (en) * | 1999-01-04 | 2002-04-23 | Medivance, Inc. | Cooling/heating pad and system |
US6606754B1 (en) * | 1999-03-30 | 2003-08-19 | Gaymar Industries, Inc. | Supported hypo/hyperthermia pad |
US6354099B1 (en) * | 2000-04-11 | 2002-03-12 | Augustine Medical, Inc. | Cooling devices with high-efficiency cooling features |
US6718785B2 (en) * | 2000-04-11 | 2004-04-13 | Arizant Healthcare Inc. | Cooling devices with high-efficiency cooling features |
US6944987B2 (en) * | 2000-08-25 | 2005-09-20 | Van Loef Marko J G | Fishing device suitable for cooperating with a fishing rod |
US6942015B1 (en) * | 2000-10-05 | 2005-09-13 | Jenkins Comfort Systems, Llc | Body heating/cooling apparatus |
US6565699B1 (en) * | 2000-10-19 | 2003-05-20 | The United States Of America As Represented By The Secretary Of The Army | Method and apparatus for making body heating and cooling garments |
US6493889B2 (en) * | 2001-01-29 | 2002-12-17 | Project Cool Air, Inc. | Cooling cover apparatus |
US6827128B2 (en) * | 2002-05-20 | 2004-12-07 | The Board Of Trustees Of The University Of Illinois | Flexible microchannel heat exchanger |
US6904966B2 (en) * | 2002-05-20 | 2005-06-14 | The Board Of Trustees Of The University Of Illinois | Flexible microchannel heat exchanger |
US7243703B2 (en) * | 2002-07-29 | 2007-07-17 | Ube Industries, Ltd. | Flexible heat exchanger |
US6945987B2 (en) * | 2002-11-08 | 2005-09-20 | Kci Licensing, Inc. | Patient cooling system |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100205739A1 (en) * | 2001-05-25 | 2010-08-19 | Gallant Dennis J | Thermoregulation equipment for patient room |
US8499503B2 (en) | 2001-05-25 | 2013-08-06 | Hill-Rom Services, Inc. | Thermoregulation equipment for patient room |
US8683750B2 (en) | 2001-05-25 | 2014-04-01 | Hill-Rom Services, Inc. | Architectural headwall cabinet for storing a lift device |
US8910334B2 (en) | 2008-12-17 | 2014-12-16 | Stryker Corporation | Patient support |
US8397326B2 (en) | 2010-02-05 | 2013-03-19 | Stryker Corporation | Patient/invalid handling support |
US8832885B2 (en) | 2010-02-05 | 2014-09-16 | Stryker Corporation | Patient/invalid handling support |
US8856992B2 (en) | 2010-02-05 | 2014-10-14 | Stryker Corporation | Patient/invalid handling support |
US8911387B2 (en) | 2010-02-05 | 2014-12-16 | Stryker Corporation | Patient/invalid handling support |
US9820904B2 (en) | 2011-07-13 | 2017-11-21 | Stryker Corporation | Patient/invalid handling support |
US10987265B2 (en) | 2011-07-13 | 2021-04-27 | Stryker Corporation | Patient/invalid handling support |
USD792974S1 (en) * | 2013-03-04 | 2017-07-25 | SEIRATHERM GmbH | Equipment cart |
US9782312B2 (en) | 2013-09-05 | 2017-10-10 | Stryker Corporation | Patient support |
Also Published As
Publication number | Publication date |
---|---|
US20100017961A1 (en) | 2010-01-28 |
EP1865895A4 (en) | 2013-11-06 |
WO2006102598A2 (en) | 2006-09-28 |
JP2008534077A (en) | 2008-08-28 |
EP1865814A4 (en) | 2009-12-02 |
AU2006269702A1 (en) | 2007-01-18 |
EP1865814A2 (en) | 2007-12-19 |
AU2006226813A1 (en) | 2006-09-28 |
JP2008534079A (en) | 2008-08-28 |
WO2006102598A3 (en) | 2007-03-08 |
US7921488B2 (en) | 2011-04-12 |
EP1865814B1 (en) | 2014-11-19 |
EP1865895A2 (en) | 2007-12-19 |
WO2007008260A2 (en) | 2007-01-18 |
WO2007008260A3 (en) | 2007-04-19 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP1865814B1 (en) | Thermoregulation device | |
EP3117816B1 (en) | Patient/invalid support | |
EP2538912B1 (en) | Patient support systems and methods for transferring patients and controlling patient temperature | |
US8640281B2 (en) | Non-inflatable temperature control system | |
US9782311B2 (en) | Patient/invalid support with pressure reducing system | |
WO1996003957A1 (en) | Pneumatic wheelchair cushion | |
US9079371B2 (en) | Cell matrix system and method for manufacturing same | |
EP1874250B1 (en) | An inflatatable component for an alternating pressure mattress | |
US9119480B1 (en) | Pressure variable thermal adaptive microclimate surface and thermoelectric cells for microclimate surface | |
EP2811865B1 (en) | Expandable structure constructed from sealed films | |
FI89868C (en) | STOEDSYSTEM FOER MINSKANDE AV UPPKOMSTEN AV LIGGSAOR | |
EP2869800B1 (en) | Pressure ulcer management pad | |
WO1997017870A1 (en) | Cellular air loss mattress system |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: HILL-ROM SERVICES, INC.,DELAWARE Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:KING, RACHEL HOPKINS;YERMANENI, MAYUR;BRANSON, GREGORY W.;AND OTHERS;SIGNING DATES FROM 20070724 TO 20070907;REEL/FRAME:019807/0256 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |