USRE44453E1 - Humidifier with structure to prevent backflow of liquid through the humidifier inlet - Google Patents
Humidifier with structure to prevent backflow of liquid through the humidifier inlet Download PDFInfo
- Publication number
- USRE44453E1 USRE44453E1 US13/100,783 US201113100783A USRE44453E US RE44453 E1 USRE44453 E1 US RE44453E1 US 201113100783 A US201113100783 A US 201113100783A US RE44453 E USRE44453 E US RE44453E
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- US
- United States
- Prior art keywords
- humidifier
- chamber
- inlet
- assembly according
- base
- 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.)
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Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
- A61M16/10—Preparation of respiratory gases or vapours
- A61M16/14—Preparation of respiratory gases or vapours by mixing different fluids, one of them being in a liquid phase
- A61M16/16—Devices to humidify the respiration air
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
- A61M16/10—Preparation of respiratory gases or vapours
- A61M16/1075—Preparation of respiratory gases or vapours by influencing the temperature
- A61M16/109—Preparation of respiratory gases or vapours by influencing the temperature the humidifying liquid or the beneficial agent
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
- A61M16/0057—Pumps therefor
- A61M16/0066—Blowers or centrifugal pumps
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M2205/00—General characteristics of the apparatus
- A61M2205/21—General characteristics of the apparatus insensitive to tilting or inclination, e.g. spill-over prevention
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S261/00—Gas and liquid contact apparatus
- Y10S261/65—Vaporizers
Definitions
- the present invention relates to a humidifier for use with an apparatus for supplying breathable gas such as those used for Non-invasive Positive Pressure Ventilation (NIPPV) or Continuous Positive Airway Pressure (CPAP).
- NIPPV Non-invasive Positive Pressure Ventilation
- CPAP Continuous Positive Airway Pressure
- An apparatus for NIPPV or CPAP typically comprises a blower whose output is connected to a patient interface, such as a mask, via an air delivery conduit.
- a patient interface such as a mask
- Humidifiers typically include a water reservoir and are configured such that ambient air from the blower entering the humidifier collects moisture through contact with the water, before continuing on to the patient interface.
- blower and humidifier are separate components connected via a flexible conduit.
- An air delivery conduit connects the humidifier outlet to a patient interface mask.
- the blower and humidifier may be rigidly-connected together. Air from the blower outlet passes into the humidifier inlet where it is humidified and then passes to the air delivery conduit.
- a potential problem with either arrangement is that if the humidifier is tilted relative to its normal orientation, water may run or spill from the humidifier into the blower outlet which may damage the electrical circuits of the blower and potentially cause infection control problems.
- One embodiment of the present invention includes an apparatus for humidifying breathable gas including a humidifier body configured to retain a body of liquid therein, an inlet communicated with an interior of the humidifier body and connectable to a blower outlet, and an outlet communicated with the interior of the humidifier body and connectable to a patient supply conduit.
- the interior of the humidifier is arranged such that liquid from the body of liquid is prevented from exiting the humidifier body through the inlet thereof when the humidifier body is rotated from a working, upright orientation.
- the liquid is substantially prevented from entering the blower outlet and possibly damaging the blower.
- the apparatus may also include a first chamber having an inlet and an outlet, the first chamber inlet preferably being connectable to a blower outlet, a second chamber having an inlet preferably connected to the first chamber outlet, and an outlet preferably connectable to the patient supply conduit, the second chamber preferably having the carrying capacity for the body of liquid.
- the first chamber inlet and outlet and volumes of the first and second chambers may be adapted such that, when the humidifier is disposed in the working upright orientation, the body of liquid is contained in the second chamber and, in other relative positions of the humidifier, the body of liquid is retained in at least one of the second chamber and the first and second chambers at a level therewithin below a level of the first chamber inlet.
- a volume of the second chamber may be larger than a volume of the first chamber.
- the first chamber may be located substantially above the second chamber in the working upright orientation of the apparatus.
- the first chamber inlet and outlet may be located adjacent opposing sections of the first chamber.
- the second chamber outlet may be located closer to the first chamber outlet than the first chamber inlet.
- At least a portion of a base of the second chamber may be made of a heat conducting material.
- the heat conductive portion may be in the form of a metallic cap which covers an opening of the base.
- the apparatus may also include a top cover, a base, and a divider disposed between the top cover and base, wherein the base defines a receptacle formed therewithin, which preferably retains the body of liquid in the working orientation of the apparatus.
- the top cover and the divider together may define the first chamber and the receptacle and the divider together form the second chamber.
- the first chamber inlet and the second chamber outlet may be formed in the top cover and is the first chamber outlet and the second chamber inlet may be formed in the divider, the first chamber outlet and the second chamber inlet may be defined by a single aperture in the divider which communicates the first and second chambers.
- the divider may define first and second sections, the first section together with the top cover preferably defining the first chamber.
- the divider may include a plurality of apertures, separated by ribs, which may provide fluid communication from the second chamber to the second chamber outlet formed in the top cover.
- the top cover and the base may be formed from a relatively rigid polymer material and the divider may be formed from a relatively resilient material.
- the first chamber inlet may be connected to a blower outlet, the first chamber outlet may be connected to the second chamber inlet, the second chamber outlet may be connected to the patient supply conduit, and a portion of the second chamber below and behind the second chamber inlet may define a volume thereof greater than a volume of the body of liquid.
- a portion of the second chamber between the first chamber inlet and the second chamber inlet and below the second chamber inlet may define a volume thereof greater than the volume of the body of liquid.
- Portions of the first chamber and second chamber between the first chamber inlet and the second chamber outlet may define a volume thereof greater man the volume of the body of liquid.
- Another embodiment of the present invention includes a CPAP apparatus including an apparatus for humidifying breathable gas as described above.
- a humidifier for a CPAP apparatus having a humidifier body defining a fluid reservoir and a fluid passage therein.
- the humidifier body has first and second chambers with a dividing member therebetween.
- the dividing member includes an orifice therethrough to communicate the first and second chambers with one another.
- Air from a blower arrives in the first chamber via a first chamber inlet and departs from the second chamber via a second chamber outlet.
- the fluid passage includes the inlet, outlet, the orifice, and, at least, portions of the first and second chambers.
- the humidifier is designed to carry a body of liquid having a maximum volume, V max . In a working orientation of the humidifier, the liquid body lies in a bottom portion of the second chamber.
- the first and second chambers are configured such that a volume of a first portion of the second chamber, which lies directly beneath the fist chamber, is greater than V max . Additionally, the volume of a second portion of the second chamber, which is disposed to the side of the first chamber, is greater than V max . Furthermore, the volume of a portion of the second chamber forward of the inlet plus a portion of the first chamber forward of the inlet is greater than V max . Additionally, the volume of a portion of the second chamber to the side of the inlet plus a portion of the first chamber to the side of the inlet is greater than V max .
- Yet another embodiment of the present invention includes a humidifier for a CPAP apparatus having first and second chambers, wherein an inlet lo the humidifier is communicated with the first chamber, an outlet from the humidifier is communicated with the second chamber, and the first and second chambers are intercommunicated via an orifice extending therebetween.
- the inlet and orifice are arranged relative to one another such that a level of a volume of liquid present within the humidifier is below at least one of the inlet and orifice for any orientation of the humidifier.
- FIG. 1 is a schematic view of a humidifier according to one embodiment of the present invention in a working, upright orientation
- FIGS. 2-5 are schematic views of the humidifier shown in FIG. 1 in corresponding non-working, upright orientations;
- FIG. 6 is a perspective view of a humidifier according to another embodiment of the present invention in a working, upright orientation
- FIG. 7 Is an exploded perspective view of the humidifier shown in FIG. 6 ;
- FIG. 8 is a partial sectional view of the humidifier shown in FIG. 6 ;
- FIG. 9 is schematic view of the humidifier shown in FIG. 6 showing an air flow path through the humidifier
- FIGS. 10-13 are schematic views of the humidifier shown in FIG. 6 in corresponding non-working, upright orientations
- FIG. 14 is a perspective view of a humidifier and connecting structure according to another embodiment of the present invention.
- FIG. 15 is a perspective view of the connecting structure shown in FIG. 14 ;
- FIG. 16 is a bottom plan view of the humidifier shown in FIG. 14 ;
- FIG. 17 is a rear perspective view of the humidifier and connecting structure shown in FIG. 14 ;
- FIG. 18 is a bottom perspective view of the connecting structure shown in FIG. 14 ;
- FIG. 19 is a perspective view of a humidifier and heater according to another embodiment of the present invention.
- FIG. 20 is a perspective view of the heater shown in FIG. 19 ;
- FIG. 21 is a bottom view of the humidifier shown in FIG. 19 ;
- FIG. 22 is a cross-sectional view taken along line 22 - 22 in FIG. 21 ;
- FIG. 23 is a rear perspective view of the humidifier and heater shown in FIG. 19 .
- FIG. 1 schematically illustrates one embodiment of the humidifier of the present invention, indicated at 10 .
- the humidifier 10 includes a humidifier body 12 defining a fluid reservoir and fluid passage therein. Additionally, there are two chambers 14 , 16 defined by the humidifier body 12 and a dividing member 18 .
- the dividing member 18 includes an orifice 20 therethrough to communicate the chambers 14 , 16 to one another. Air from a blower (not shown) arrives in the first chamber 16 via a first chamber inlet 22 . Air departs from the second chamber 14 via a second chamber outlet 24 .
- the fluid passage includes the inlet 22 , outlet 24 , the orifice 20 , and, at least, portions of the chambers 14 , 16 .
- the humidifier 10 is designed to carry a body of liquid 26 having a maximum volume, V max .
- the liquid body 26 lies in a bottom portion of the second chamber 14 .
- the orifice 20 lies forward of and to the side of the first chamber inlet 22 (e.g., at a diagonally opposite end of the chamber 16 ).
- the volume of a first portion 14 A of the second chamber 14 which lies directly beneath the first chamber 16 , is greater than V max due to its relatively increased height.
- the volume of a second portion 14 B of the second chamber 14 which is disposed to the side of the first chamber 16 , is greater than V max .
- the volume of a portion of the second chamber 14 forward of the inlet 22 plus a portion of the first chamber 16 forward of the inlet 22 is greater thin V max .
- the volume of a portion of the second chamber 14 to the side of the inlet 22 plus a portion of the first chamber 16 to the side of the inlet 22 is greater than V max .
- the first chamber inlet 22 is positioned as far to one side of the humidifier body 12 and as far rearward of the humidifier body 12 as possible.
- the embodiment of the humidifier 10 shown in FIGS. 1-5 is configured to prevent liquid from the liquid body 26 from exiting through the inlet 22 thereof, such as when inadvertently rotated from an upright, normal working position (generally illustrated in FIG. 1 ). For this reason, it is preferable for the humidifier 10 to be capable of being rotated from the upright, working position by about 120° without allowing liquid to exit from the inlet 22 . It is more preferable for the humidifier 10 to be capable of being rotated from the upright, working position by about 80°-110° without allowing liquid to exit from the inlet 22 . It is contemplated that for the embodiment of the humidifier 10 shown in FIG.
- the humidifier 10 may be especially preferable for the humidifier 10 to be capable of being rotated from the upright, working position by about 90° without allowing liquid to exit from the inlet 22 , since the humidifier 10 is readily able to be placed on one side thereof due to the substantially fiat, normal sides thereof.
- the humidifier 10 is designed to prevent liquid from exiting the inlet thereof when inadvertently oriented in other than the upright working position, it may be possible to purposefully enable liquid to exit from the inlet, such as by jostling or rapidly and/or repeatedly rotating the humidifier 10 .
- the configuration e.g., volume
- size and placement of the inlet and outlet, and size and placement of the aperture intercommunicating the chambers may be altered from the illustrated embodiment to decrease the possibility of liquid exiting the inlet of the humidifier.
- the arrangement of the chambers 14 , 16 , inlet 22 , and outlet 24 means that, if the humidifier 10 is rotated in a clockwise direction by up to 90° about axis ⁇ , then the liquid body 26 will accumulate in the second portion 14 B of the second chamber 14 and a portion of the first chamber 16 adjacent the outlet 24 . In this situation, liquid of the liquid body 26 may run out of the outlet 24 , but will not run out of the inlet 22 back into the blower.
- the humidifier 10 has an exterior shape that is generally rectangular and the humidifier 10 .
- the inlet 22 is positioned to correspond to a blower outlet being on the upper left-hand side when viewed from the front in an upright position. Therefore the humidifier inlet 22 is positioned at the back of the humidifier 10 on the upper left-hand side, when viewed from the front in an upright position.
- the humidifier outlet 24 lies on the front upper right-hand side, when viewed from the front in an upright position.
- the inlet and outlet it is, of course, possible for the inlet and outlet to be repositioned corresponding to the position of the blower outlet.
- the level of the liquid body 26 is always below the level of at least one of the inlet 22 and orifice 20 intercommunicating the first and second chambers 16 , 14 .
- the orifice 20 is disposed above the level of the liquid body 26 , which prevents liquid from flowing therethrough and exiting the inlet 22 .
- the orifice 20 is disposed-below the level of the liquid body 26 (such as in orientations illustrated in FIGS. 2 and 5 )
- the inlet 22 is disposed above the level of the liquid body 26 . Accordingly, liquid may flow through the orifice 20 , but is prevented from exiting through the inlet 22 .
- FIG. 6 shows another embodiment of a humidifier 30 according to the present invention.
- the humidifier 30 includes an inlet 32 and an outlet 34 , both of which are communicated with an interior of the humidifier 30 .
- the interior of the humidifier 30 defines a reservoir for a body of liquid and a fluid passage.
- the fluid passage is communicated to each of the inlet 32 and outlet 34 and is configured such that fluid (e.g., breathable gas at an elevated pressure) flowing therethrough is exposed to the body of liquid.
- the humidifier 30 is adapted for detachable connection to an NIPPV or CPAP apparatus (not shown) which includes a blower. When connected, the output of the blower is attached to the inlet 32 . Air from the blower enters the inlet 32 , flows through the fluid passage, and collects moisture through contact with the liquid body, before continuing onto the outlet 34 and then to the patient.
- the humidifier 30 may include an additional internal passage to allow monitoring of the CPAP pressure without degrading signal strength or necessitating relatively large correction factors due to signal attenuation within the humidifier, such as described in co-pending Applications incorporated above, as well as co-pending Application No. WO 02/066107, entitled “Air Pressure Signal Monitoring in Apparatus for Treating Sleep Disordered Breathing”, filed on even date herewith and hereby incorporated by reference in its entirety.
- the humidifier 30 includes a top cover 36 , a gasket 38 , and a base 40 .
- the gasket 38 is disposed between the top cover 36 and base 40 , which are secured together via sliding clips 72 .
- the top cover 36 and base 40 may be formed with snap-fit or other cooperating constructions.
- other types of mechanical fasteners may be utilized.
- the top cover 36 may be formed from a relatively rigid polymer material, such as polysulfone (for example, grade UDEL P1700, manufactured by BP Amoco Polymers), and includes the inlet 32 and the outlet 34 .
- the gasket 38 may be formed from a relatively resilient material, such as silicone rubber (for example, SILASTIC 94595-IIC, manufactured by Dow Corning) and is divided into first and second sections 42 and 44 by a channel structure 46 .
- the first section 42 includes a raised portion 48 having a first aperture 50 extending vertically therethrough.
- the second section 44 includes a plurality of second apertures 52 extending vertically therethrough and being separated from one another by ribs 54 .
- the top cover 36 may also include a divider wall structure 56 ( FIG. 8 ) which corresponds to and is received within the channel structure 46 of the gasket 38 .
- the gasket 38 includes a sealing flange 58 formed about a periphery thereof.
- the base 40 may be formed from the same or similar rigid polymer material as the top cover 36 and may include a receptacle 60 formed therewithin, a bottom portion 62 , and side walls 64 extending upwardly from the bottom portion 62 .
- the base 40 may also include a removable bridge structure 66 , which divides the receptacle 60 into two sections 68 and 70 , which correspond to the sections 22 42 and 24 44 of the gasket 38 .
- the gasket 38 is attached the base 40 .
- the flange 58 of the gasket 38 forms a sealing engagement with an upper edge portion of the side walls 64 of the base 40 .
- the top cover 36 is then attached to the base 40 via sliding clips 72 ( FIG. 6 ) on opposite sides of the humidifier 30 , such that the top cover 36 covers and seals with the gasket 38 .
- the removable bridge structure 66 vertically supports an intermediate portion of the gasket 38 . As shown, a downwardly facing surface of the channel structure 46 of the gasket 38 engages an upwardly facing surface of the bridge structure 66 .
- the gasket first section 42 , the top cover 36 , and the divider wall structure of the top cover 36 together form a first chamber 74 .
- the receptacle 60 of the base 40 together with the gasket 38 form a second chamber 76 .
- the first chamber 74 is thus located above the second chamber 76 and the volume of the second chamber 76 is larger than the volume of the first chamber 74 .
- the first and second chambers 74 , 76 are in communication with one another via the first aperture 50 within the gasket 38 .
- the second chamber 76 is in communication with the outlet 34 via the second apertures 52 within the gasket 38 .
- a predetermined maximum volume of liquid is poured into the receptacle 60 of the base 40 after removing the top cover 36 and the sealing gasket 38 from the base 40 .
- the top cover 36 and the sealing gasket 38 are then reattached to the base 40 .
- a body of liquid 78 is held in the second chamber 76 when the humidifier 10 is in the upright working orientation of the humidifier 30 .
- Breathable gas from the blower enters the inlet 32 and travels through the first chamber 74 and into the first aperture 50 .
- the gas passes through the aperture 50 and enters the second chamber 76 where it is humidified by contact with the body of liquid 78 , before exiting through apertures 52 in the gasket 38 , and then out through outlet 34 ( FIG. 6 ).
- a liquid level, indicated at 81 , of the body of liquid 78 is below the aperture 50 .
- the body of liquid 78 will be displaced in the humidifier 30 according to the orientation of the humidifier 30 .
- the humidifier 30 is configured to substantially prevent liquid of the body of liquid 78 from exiting through the inlet 32 in non-upright orientations to avoid damage to the NIPPV or CPAP apparatus connected to the humidifier 30 .
- the embodiment of the humidifier 30 shown in FIGS. 6-13 is configured to prevent liquid from the liquid body 78 from exiting through the inlet 32 thereof, such as when inadvertently rotated from an upright normal working position (generally illustrated in FIG. 6 ). For this reason, it is preferable for the humidifier 30 to be capable of being rotated from the upright, working position by about 120° without allowing liquid to exit from the inlet 32 . It is more preferable for the humidifier 30 to be capable of being rotated from the upright, working position by about 80°-110° without allowing liquid to exit from the inlet 32 .
- the humidifier 30 may be capable of being rotated from the upright, working position by about 90° without allowing liquid to exit from the inlet 32 .
- the humidifier 30 is designed to prevent liquid from exiting the inlet thereof when inadvertently oriented in other than the upright working position, it may be possible to purposefully enable liquid to exit from the inlet, such as by jostling or rapidly and/or repeatedly rotating the humidifier 30 .
- the configuration e.g., volume
- size and placement of the inlet and outlet, and size and placement of the aperture intercommunicating the chambers may be altered from the illustrated embodiment to decrease the possibility of liquid exiting the inlet of the humidifier.
- the level of the liquid body 78 is always below the level of at least one of the inlet 32 and aperture 50 intercommunicating the first and second chambers 74 , 76 .
- the aperture 50 is disposed above the level of the liquid body 78 , which prevents liquid from flowing therethrough and exiting the inlet 32 .
- the inlet 32 is disposed above the level of the liquid body 78 in a case wherein the aperture 50 is disposed below the level of the liquid body 78 (such as in orientations illustrated in FIGS. 11 and 13 ). Accordingly, liquid may flow through the aperture 50 , but is prevented from exiting through the inlet 32 .
- the humidifier 30 is rotated to an angle about 90° from the working upright orientation, such that a side 80 thereof corresponding to the side of the humidifier 30 adjacent the inlet 32 , is oriented below a side 82 thereof corresponding to the side of the humidifier 30 adjacent the outlet 34 . Because the raised portion 48 of the gasket 38 increases the volume of the second chamber 76 , the body of liquid 78 remains only in the second chamber 76 and the level 81 of the liquid body 78 remains below the first aperture 50 . Thus, the liquid will not exit through the inlet 32 .
- the humidifier 30 is rotated to an angle about 90° from the working upright orientation, such that the side 82 is below the side 80 (i.e., flipped 180° from the orientation illustrated in FIG. 11 ).
- the level 81 of the body of liquid 78 is above (at least initially) the apertures 52 , liquid will pass therethrough and exit the outlet 34 .
- the level 81 of the liquid body 78 is below the inlet 32 , liquid will not exit through the inlet 32 . Liquid exiting through the outlet 34 is generally acceptable as there is not generally a risk in damaging the NIPPV or CPAP apparatus.
- the humidifier 30 is rotated to an angle about 90° from the working upright orientation, such that a rear side thereof indicated at 84 , corresponding to the side at which the inlet 32 is located, is below a forward side thereof indicated at 86 , corresponding to the side at which the outlet 34 is located.
- the body of liquid 78 remains substantially in the second chamber 76 and the level 81 of the liquid body 78 remains below the first aperture 50 .
- water cannot exit through the inlet 32 .
- FIG. 13 illustrates when the humidifier 30 is tilted to an angle about 90° from the working upright orientation, such that the forward side 86 is below the rear side 84 .
- the body of liquid 78 is disposed within forward portions of the first and second chambers 74 , 76 .
- the level 81 of the body of liquid 78 is at least initially above the level of the aperture 50 , liquid will flow through the aperture 50 into the first chamber 74 .
- the inlet 32 is disposed above the level of the body of liquid 78 in this orientation, no liquid exits through the inlet 34 .
- the humidifier 30 thus ensures that the body of liquid 78 is disposed in one of (a) only the second chamber 76 , or (b) portions of the first and second chambers 74 , 76 at a level below the inlet 32 , to prevent liquid from exiting through the inlet 32 at orientations of the humidifier 30 up to an angle of about 90° from the working upright orientation.
- a number of features of the humidifier 30 contribute to ensuing this function. These include relive positions of the inlet 32 and first aperture 50 . More particularly, the inlet 32 and first aperture 50 are located on opposing ends of the first chamber 74 .
- the volume of the second chamber 76 is larger than the volume of the first chamber 74 , which is assisted by the raised portion 48 of the gasket 38 so that liquid displaced from the first chamber 74 may be accommodated within the second chamber 76 without overflow through aperture 50 .
- the outlet 34 is located closer to the first aperture 50 than the inlet 32 , which assists in ensuing that liquid will exit via the outlet 34 , rather than though the inlet 32 .
- the humidifier 30 therefore substantially prevents or reduces the risk of water exiting through the inlet 32 , which may damage the NIPPV or CPAP apparatus, when the humidifier 30 is in other orientations up to an angle of about 90° from its working upright orientation.
- the humidifier 30 may be used as a retrofit or add-on component for a CPAP apparatus.
- a connecting structure 100 that is configured to connect between the CPAP apparatus and humidifier 30 .
- the connecting structure 100 includes a housing 102 , which provides a generally horizontally extending receptacle 104 within which the humidifier 30 may be disposed.
- the housing 102 provides a base portion 106 that is configured to support the humidifier 310 thereon and a retaining portion 108 configured to secure the humidifier 30 in position.
- the retaining portion 108 extends generally parallel to the base portion 106 and is spaced above the base portion 106 .
- the humidifier 30 may be formed with a recess 110 that is open and of a complimentary shape to receive the retaining portion 108 therein.
- a humidifier may include a securing mechanism 122 .
- the securing mechanism 122 includes a resiliently biased pull member 124 that includes one or more locking lugs 126 extending generally downwardly therefrom.
- the pull member 124 is disposed at a forward end (assuming the rearward end of the humidifier 120 is adjacent the connecting structure 100 ) of the humidifier 120 and is resiliently biased by a pair of resilient legs 128 . Rearward portions of the legs 128 are relatively securely retained within corresponding pocket structures 130 provided on a bottom side of the humidifier 120 .
- Ribs 132 extend is downwardly from the bottom side of the humidifier 120 and engage an intermediary portion of the legs 128 to define a space between the resilient legs 128 and the bottom side of the humidifier 120 .
- the pull member 124 is biased generally downwardly by the resilient legs 128 , but may be manually moved (e.g., pulled) upward against a resilient bias of the legs 128 .
- a forward portion of the base portion 106 includes generally upwardly open lug receiving recesses 134 within which the lugs 126 may be disposed when the humidifier 120 is disposed within the receptacle 104 .
- the legs 128 resiliently bias the legs 126 into recesses 134 .
- the lugs 126 and recesses 134 thereby secure the humidifier 120 within the receptacle 104 .
- the pull member 124 is pulled upwardly to withdraw the lugs 126 from the recesses 134 .
- the humidifier 120 may then be pulled generally horizontally out of the receptacle 104 .
- FIG. 17 shows a rearward side of the connecting structure 100 .
- the rearward side of the connecting structure 100 provides a retaining mechanism 140 to secure the connecting structure 100 to the CPAP apparatus.
- the retaining mechanism 140 may include a series of apertures 142 within the rearward portion of the housing 102 .
- the apertures 142 may receive therein, for example, prongs or tabs (not shown) provided by the CPAP apparatus.
- a locking member 144 may be provided that is resiliently biased toward a position that partially encloses the respective aperture 142 .
- FIG. 18 shows a locking member 144 that is resiliently biased toward a position that partially encloses the respective aperture 142 .
- a button structure 146 may be coupled to the locking members 144 , such that manual movement of the button structure 146 moves the locking members 144 out of their biased positions to substantially fully open the apertures 142 .
- the tabs or prongs on the CPAP apparatus are provided with a groove therein such that when positioned within the apertures 142 , the locking members 144 engage within respective grooves to thereby securely and detachably retain the connecting structure 100 to the CPAP apparatus.
- the housing 102 of the connecting structure 100 may be provided with an opening 148 that allows the inlet of the humidifier to extend therethrough so as to be connected to the CPAP apparatus.
- FIG. 19 another embodiment of the connecting structure, indicated at 150 in is FIG. 19 , may include a heater 152 .
- the connecting structure 150 may include a housing 154 , which provides a base portion 156 and retaining portion 158 , similar to the housing 102 described above.
- the retaining portion 158 may include a controller such as a knob or other selecting device 160 thereon to control a heat setting of the heater 152 .
- the controller 160 may include a display device, such as an LCD screen.
- the base portion 156 may include a heating element 162 thereon.
- the heating element 162 may be in the form of a substantially flat plate-like resistance heater, which heat generated thereby may be directly controlled by the controller 160 .
- FIG. 19 another embodiment of the humidifier is indicated at 170 .
- the humidifier 170 is disposed within a receptacle 172 provided by the housing 154 . It is contemplated that the humidifier 170 has the same basic construction as the humidifiers 10 and 120 described above. However, it is contemplated that the humidifier 170 may include a heating plate 174 (also referred to as a metallic cap) to facilitate heating of the liquid contained therein.
- an opening 176 is provided within a bottom wall 178 of the humidifier 170 .
- the heating plate 174 is shaped to fit within the opening 176 , as shown in FIG. 21 .
- the heating plate 174 includes an upstanding peripheral wall 180 which includes an outwardly extending peripheral lip 182 .
- a resilient seal member 184 is disposed about an outer periphery of the peripheral wall 180 in contact with the peripheral lip 182 .
- a ring-like retaining member 186 may be press-fit onto the peripheral wall 180 to retain the seal 184 in position on the peripheral wall 180 .
- the retaining member 186 includes an outwardly extending flange structure 188 .
- the seal 184 is disposed between the peripheral lip 182 and flange structure 188 . It is contemplated that the retaining member 186 may be press fit onto the heating plate 174 , as described above, or may be formed in one piece therewith.
- the bottom wall 178 of the humidifier 170 is formed with an annular upstanding flange 190 which receives the heating plate 174 . It is contemplated that the flange 190 may be slightly tapered inwardly in the upward direction to ease insertion of the heating plate 174 . As shown, the flange 190 may include a generally horizontally extending lip structure 192 that vertically retains the heating plate 174 .
- a bottom surface of the heating plate 174 is in contact with an upper surface of the heating element 162 .
- a heat generated by the heating element 162 is conducively transferred to the heating plate 174 .
- the liquid within the humidifier 170 is exposed to an upper surface of the heating plate 174 and conducts heat therefrom. It is contemplated that a temperature of the liquid within the humidifier 170 may be controlled by manipulation of the controller 160 .
- the heating element 162 may be upwardly resiliently biased to ensure adequate contact between the heating element 162 and the heating plate 174 .
- a rearward portion of the connecting suture 150 may include a plurality of generally outwardly extending contact elements 194 .
- the contact element 194 may communicate with a power supply within the CPAP apparatus and/or a controller and/or sensors. In this manner, power may be delivered to the heater 152 directly from the CPAP apparatus.
- a controller within the CPAP apparatus itself may control the heater 152 .
- sensors within the CPAP apparatus may monitor a heat output of the heater 152 .
- a CPAP apparatus may automatically adjust a heat output of the heater 152 based on a measured temperature thereof or of the water within the humidifier or of the breathable air exiting the humidifier.
Abstract
Description
Claims (98)
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/100,783 USRE44453E1 (en) | 2001-02-16 | 2011-05-04 | Humidifier with structure to prevent backflow of liquid through the humidifier inlet |
US13/944,960 USRE46079E1 (en) | 2001-02-16 | 2013-08-23 | Humidifier with structure to prevent backflow of liquid through the humidifier inlet |
US15/182,919 USRE46571E1 (en) | 2001-02-16 | 2016-06-15 | Humidifier with structure to prevent backflow of liquid through the humidifier inlet |
US15/706,811 USRE48149E1 (en) | 2001-02-16 | 2017-09-18 | Humidifier with structure to prevent backflow of liquid through the humidifier inlet |
US16/231,286 USRE48118E1 (en) | 2001-02-16 | 2018-12-21 | Humidifier with structure to prevent backflow of liquid through the humidifier inlet |
US16/232,883 USRE48095E1 (en) | 2001-02-16 | 2018-12-26 | Humidifier with structure to prevent backflow of liquid through the humidifier inlet |
US16/277,660 US20190209802A1 (en) | 2001-02-16 | 2019-02-15 | Humidifier with structure to prevent backflow of liquid through the humidifier inlet |
Applications Claiming Priority (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AUPR3117 | 2001-02-16 | ||
AUPR3117A AUPR311701A0 (en) | 2001-02-16 | 2001-02-16 | Humidifier with spill protection |
AUPR7288 | 2001-08-27 | ||
AUPR7288A AUPR728801A0 (en) | 2001-08-27 | 2001-08-27 | A humidifier |
US10/467,382 US6935337B2 (en) | 2001-02-16 | 2002-02-14 | Humidifier with structure to prevent backflow of liquid through the humidifier inlet |
PCT/AU2002/000155 WO2002066106A1 (en) | 2001-02-16 | 2002-02-14 | Humidifier with structure to prevent backflow of liquid through the humidifier inlet |
US11/181,807 US7614398B2 (en) | 2001-02-16 | 2005-07-15 | Humidifier with structure to prevent backflow of liquid through the humidifier inlet |
US13/100,783 USRE44453E1 (en) | 2001-02-16 | 2011-05-04 | Humidifier with structure to prevent backflow of liquid through the humidifier inlet |
Related Parent Applications (3)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/AU2002/000155 Continuation WO2002066106A1 (en) | 2001-02-16 | 2002-02-14 | Humidifier with structure to prevent backflow of liquid through the humidifier inlet |
US10467382 Continuation | 2002-02-14 | ||
US11/181,807 Reissue US7614398B2 (en) | 2001-02-16 | 2005-07-15 | Humidifier with structure to prevent backflow of liquid through the humidifier inlet |
Related Child Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/181,807 Continuation US7614398B2 (en) | 2001-02-16 | 2005-07-15 | Humidifier with structure to prevent backflow of liquid through the humidifier inlet |
US13/944,960 Continuation USRE46079E1 (en) | 2001-02-16 | 2013-08-23 | Humidifier with structure to prevent backflow of liquid through the humidifier inlet |
Publications (1)
Publication Number | Publication Date |
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USRE44453E1 true USRE44453E1 (en) | 2013-08-27 |
Family
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Application Number | Title | Priority Date | Filing Date |
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US10/467,382 Expired - Lifetime US6935337B2 (en) | 2001-02-16 | 2002-02-14 | Humidifier with structure to prevent backflow of liquid through the humidifier inlet |
US11/181,807 Ceased US7614398B2 (en) | 2001-02-16 | 2005-07-15 | Humidifier with structure to prevent backflow of liquid through the humidifier inlet |
US13/100,783 Expired - Lifetime USRE44453E1 (en) | 2001-02-16 | 2011-05-04 | Humidifier with structure to prevent backflow of liquid through the humidifier inlet |
US13/944,960 Expired - Lifetime USRE46079E1 (en) | 2001-02-16 | 2013-08-23 | Humidifier with structure to prevent backflow of liquid through the humidifier inlet |
US15/182,919 Expired - Lifetime USRE46571E1 (en) | 2001-02-16 | 2016-06-15 | Humidifier with structure to prevent backflow of liquid through the humidifier inlet |
US15/706,811 Expired - Lifetime USRE48149E1 (en) | 2001-02-16 | 2017-09-18 | Humidifier with structure to prevent backflow of liquid through the humidifier inlet |
US16/231,286 Expired - Lifetime USRE48118E1 (en) | 2001-02-16 | 2018-12-21 | Humidifier with structure to prevent backflow of liquid through the humidifier inlet |
US16/232,883 Expired - Lifetime USRE48095E1 (en) | 2001-02-16 | 2018-12-26 | Humidifier with structure to prevent backflow of liquid through the humidifier inlet |
US16/277,660 Abandoned US20190209802A1 (en) | 2001-02-16 | 2019-02-15 | Humidifier with structure to prevent backflow of liquid through the humidifier inlet |
Family Applications Before (2)
Application Number | Title | Priority Date | Filing Date |
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US10/467,382 Expired - Lifetime US6935337B2 (en) | 2001-02-16 | 2002-02-14 | Humidifier with structure to prevent backflow of liquid through the humidifier inlet |
US11/181,807 Ceased US7614398B2 (en) | 2001-02-16 | 2005-07-15 | Humidifier with structure to prevent backflow of liquid through the humidifier inlet |
Family Applications After (6)
Application Number | Title | Priority Date | Filing Date |
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US13/944,960 Expired - Lifetime USRE46079E1 (en) | 2001-02-16 | 2013-08-23 | Humidifier with structure to prevent backflow of liquid through the humidifier inlet |
US15/182,919 Expired - Lifetime USRE46571E1 (en) | 2001-02-16 | 2016-06-15 | Humidifier with structure to prevent backflow of liquid through the humidifier inlet |
US15/706,811 Expired - Lifetime USRE48149E1 (en) | 2001-02-16 | 2017-09-18 | Humidifier with structure to prevent backflow of liquid through the humidifier inlet |
US16/231,286 Expired - Lifetime USRE48118E1 (en) | 2001-02-16 | 2018-12-21 | Humidifier with structure to prevent backflow of liquid through the humidifier inlet |
US16/232,883 Expired - Lifetime USRE48095E1 (en) | 2001-02-16 | 2018-12-26 | Humidifier with structure to prevent backflow of liquid through the humidifier inlet |
US16/277,660 Abandoned US20190209802A1 (en) | 2001-02-16 | 2019-02-15 | Humidifier with structure to prevent backflow of liquid through the humidifier inlet |
Country Status (9)
Country | Link |
---|---|
US (9) | US6935337B2 (en) |
EP (4) | EP2465565B1 (en) |
JP (1) | JP4420605B2 (en) |
CN (1) | CN1301761C (en) |
AU (1) | AU2002233025B2 (en) |
ES (1) | ES2599753T3 (en) |
HK (1) | HK1065493A1 (en) |
NZ (1) | NZ527088A (en) |
WO (1) | WO2002066106A1 (en) |
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JP2004524087A (en) | 2004-08-12 |
US20190209802A1 (en) | 2019-07-11 |
EP1359962B1 (en) | 2016-08-17 |
JP4420605B2 (en) | 2010-02-24 |
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EP2465565A1 (en) | 2012-06-20 |
EP2465565B1 (en) | 2016-11-30 |
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EP2335761B1 (en) | 2017-04-05 |
ES2599753T3 (en) | 2017-02-03 |
CN1491124A (en) | 2004-04-21 |
AU2002233025B2 (en) | 2007-05-31 |
HK1065493A1 (en) | 2005-02-25 |
EP3254722A2 (en) | 2017-12-13 |
USRE46571E1 (en) | 2017-10-17 |
USRE48149E1 (en) | 2020-08-11 |
EP1359962A1 (en) | 2003-11-12 |
EP2335761A1 (en) | 2011-06-22 |
US7614398B2 (en) | 2009-11-10 |
CN1301761C (en) | 2007-02-28 |
WO2002066106A1 (en) | 2002-08-29 |
USRE48118E1 (en) | 2020-07-28 |
EP1359962A4 (en) | 2009-11-11 |
US6935337B2 (en) | 2005-08-30 |
EP3254722A3 (en) | 2018-05-02 |
NZ527088A (en) | 2005-04-29 |
USRE46079E1 (en) | 2016-07-26 |
USRE48095E1 (en) | 2020-07-14 |
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