US20120051943A1 - Peristaltic hose pump - Google Patents
Peristaltic hose pump Download PDFInfo
- Publication number
- US20120051943A1 US20120051943A1 US12/965,185 US96518510A US2012051943A1 US 20120051943 A1 US20120051943 A1 US 20120051943A1 US 96518510 A US96518510 A US 96518510A US 2012051943 A1 US2012051943 A1 US 2012051943A1
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- United States
- Prior art keywords
- hose
- roller wheel
- fluid
- pump
- peristaltic
- 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
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B43/00—Machines, pumps, or pumping installations having flexible working members
- F04B43/12—Machines, pumps, or pumping installations having flexible working members having peristaltic action
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B43/00—Machines, pumps, or pumping installations having flexible working members
- F04B43/12—Machines, pumps, or pumping installations having flexible working members having peristaltic action
- F04B43/1253—Machines, pumps, or pumping installations having flexible working members having peristaltic action by using two or more rollers as squeezing elements, the rollers moving on an arc of a circle during squeezing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/02—Stopping, starting, unloading or idling control
- F04B49/03—Stopping, starting, unloading or idling control by means of valves
- F04B49/035—Bypassing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/22—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/22—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves
- F04B49/24—Bypassing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B2205/00—Fluid parameters
- F04B2205/01—Pressure before the pump inlet
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B2205/00—Fluid parameters
- F04B2205/09—Flow through the pump
Definitions
- the invention concerns a peristaltic hose pump, in particular for use in the field of medicine, comprising a roller wheel, which can be driven about a roller wheel axis, and which has rollers that are mounted thereon, the roller wheel rotation axes of which are arranged on a circle concentric with the roller wheel axis, the rollers partly projecting beyond the roller wheel, comprising a hose, which has a flexible and elastic pump segment, the pump segment being fixable in the axial direction at its two opposite ends by means of one fixing point each, and the pump segment being guided around the roller wheel under elastic tension.
- the invention further concerns the use of such a peristaltic hose pump for generating a fluid flow through a medical instrument.
- Peristaltic hose pumps of the construction mentioned above are known in various variants.
- the first basic concept is that the hose arranged around the roller wheel is pressed by means of a pressure arched element or the like against the roller wheel.
- a pressure arched element or the like against the roller wheel.
- the second basic concept on which the invention is based, consists in that the elastic hose is pulled by a tensile force of suitable size with a sufficient angle of wrapping, typically more than 90° and less than 270°, in most cases in the range from 150° to 220°, around the roller wheel.
- a pressure arched element or the like is not necessary.
- the tensile force is dimensioned according to the elastic properties of the hose such that in the region of a roller of a roller wheel, the interior cross-section of the hose is reduced to practically zero. By rotation of this region with the roller about the roller wheel axis, the feed of the fluid in the hose is effected. Examples are described in the documents U.S. Pat. No. 4,537,561 and U.S. Pat. No. 5,213,483. A particularly advantageous variant of the second basic concept is described in the document DE 199 60 668 A1.
- the pressure respectively counter-pressure is a critical parameter.
- a doctor wishes on the one hand a high flow for rinsing the body cavity.
- a certain pressure is in fact desirable for expanding the body cavity, this pressure is however also a very critical parameter.
- Typical pressures, which are medically harmless, are in the range from approx. 50 to 300 mbar.
- a pressure sensor is provided, which regularly monitors the pressure in the body cavity and/or the feed line to the medical instrument respectively the pressure side of the peristaltic pump and adjusts the drive of the roller wheel to smaller speeds, if the pressure is too high. It is even possible that the roller wheel is adjusted to reverse operation in the case of a strong pressure rise in the body cavity. This will in particular take place, when an inadmissibly high pressure could occur at a very small flow already.
- a peristaltic hose pump which can be obtained in a simple construction, in particular does not need measurements of the pressure in the body cavity respectively on the pressure side of the peristaltic pump, nor control measures for the drive of the roller wheel, and which nevertheless safely excludes that a given maximum limit pressure is exceeded.
- the invention teaches a peristaltic hose pump comprising a roller wheel, which can be driven about a roller wheel axis, and which has rollers that are mounted thereon, the roller wheel rotation axes of which are arranged on a circle concentric with the roller wheel axis, the rollers partly projecting beyond the roller wheel, comprising a hose, which has a flexible and elastic pump segment, the pump segment being fixable in the axial direction at its two opposite ends by means of one fixing point each, and the pump segment being guided around the roller wheel under elastic tension, wherein the length of the pump segment when not under tension in proportion to the distance of the fixing points to the roller wheel rotation axis is adjusted with the provision that while the roller wheel is stationary and when applying a fluid pressure in the range from 10 to 400 mbar to one end of the pump segment, a flow of the fluid of at least 0.01 1/min through the pump segment is obtained.
- the roller wheel is typically set into rotation by means of an electric motor drive, thereby the cross-section of the pump segment of the hose being reduced in the region of a roller.
- the speed of the roller wheel may be unregulated, for instance by applying a preselectable voltage (for analogous electric motors) or frequency (for stepper motors) to the electric motor drive. It is also possible to keep the speed of the roller wheel constant at a preselectable speed by a control loop.
- a transducer for instance a speedo dial, is typically arranged on the shaft of the roller wheel, by means of which a speed signal is generated. This speed signal is then compared in an analog or digital comparator with a preselected nominal signal.
- the comparator When the speed signal indicates a too low speed, compared with the nominal speed correlated with the nominal signal, the comparator increases the voltage respectively the frequency, which is applied to the electric motor drive.
- An essential element of the invention is that this control or regulation does not obtain nor need as input signal a signal of a pressure sensor arranged on the pressure side of the peristaltic hose pump.
- a pump segment of a hose is a partial length of the hose, which is made of an elastic and flexible material. At the ends of the pump segment respectively follow partial lengths of the hose, which in most cases, but not necessarily are made of another material and/or are differently dimensioned.
- the partial length of the hose, which forms the pump segment, is limited and defined by the fixing points.
- the fixing points are disposed in the geometric layout, related to directions orthogonal to the roller wheel axis, at defined and fixed points in the peristaltic pump. Thereby, the hose segment of a certain length is, after guiding it around the roller wheel, under an elastic tension given according to the length.
- the invention is based first of all on the finding that the reason for the non-linearity between speed and flow at high pressures is that with very high pressures, the interior cross-section of the hose respectively of the pump segment is reduced not to zero anymore in the region of a roller of the roller wheel because of the (counter-) pressure. Because of the pressure, there is therefore a backflow, referred to the reduced interior cross-section of the pump segment and the revolution thereof about the roller wheel axis, in opposition to the direction of rotation of the roller wheel and consequently the feed direction of the peristaltic hose pump. This backflow in turn is a function of the pressure and becomes the higher, the higher the pressure on the pressure side of the hose pump is.
- the invention makes use of this finding for adjusting a maximum attainable pressure in medically compatible pressure ranges, i.e., below 400 mbar, preferably below 300 mbar, by allowing the provision of a backflow at normal operating conditions already.
- a maximum attainable pressure in medically compatible pressure ranges i.e., below 400 mbar, preferably below 300 mbar.
- a peristaltic hose pump according to the invention it is achieved that with simplest design, namely without pressure-controlled regulation of the roller wheel drive and without pressure measurement and indication, nevertheless a hose pump for medical purposes meeting all safety requirements is obtained.
- a peristaltic hose pump according to the invention can thus be produced very cost-effectively. Further, its handling is extremely simple, since an operator only needs to select a defined speed, at which the roller wheel then constantly turns until another preselection. Even with maximum preselected speed, exceedance of a defined maximum admissible pressure value is inherently excluded.
- Essential for the invention is the set-up of the length of the elastic pump segment when not under tension in proportion to the distance of the fixing points to the roller wheel rotation axis.
- the set-up comprises the proportion of the length of the pump segment when not under tension to the length of the pump segment when the pump segment is guided under tension around the roller wheel by means of the fixing points.
- the set-up can in principle be provided in two different ways.
- a test series with different lengths of the pump segment when not under tension it can be tested, whether the flow according to the invention is provided when the pump segment is guided under tension around the roller wheel and while the roller wheel is stationary.
- the distance of a fixing point or the distances of both fixing points with respect to the roller wheel rotation axis can be varied and adjusted in a test series so that the flow according to the invention when the pump segment is guided under tension around the roller wheel and while the roller wheel is stationary.
- the provision according to the invention can easily be adjusted by tests and assignment to the respective constructional design of the pump segment.
- a peristaltic hose pump usually the distance of the fixing points to the roller wheel rotation axis will not be adjustable. Rather, regularly the length of the pump segment when not under tension is adapted thereto in the above manner.
- a peristaltic hose pump is designed such that the distance of at least one fixing point to the roller wheel rotation axis is adjustable.
- hoses can also be used.
- the length of the hose segment has been determined and adapted in a corresponding way for every type of a hose respectively hose segment. This may in particular have been made for instance with a hose cassette according to the document DE 199 60 668 A1, to which herewith reference comprehensively is made.
- roller wheel while the roller wheel is stationary and when applying a fluid pressure in the range from 10 to 300 mbar, preferably from 10 to 200 mbar to one end of the pump hose segment, a flow of the fluid from 0.01 1/min to 1 1/min, preferably to 0.5 1/min, most preferably to 0.1 1/min is obtained.
- the set-up of the length of the pump segment when not under tension in proportion to the distance of the fixing points to the roller wheel axis is made with the provision that with maximum speed of the roller wheel and closed pressure side of the hose, a pressure of not more than 500 mbar, preferably of not more than 450 mbar, most preferably not more than 400 mbar, in particular not more than 350 mbar or 300 mbar, appears on the pressure side.
- an optimization of the flow can also simultaneously be made such that with the above maximum pressures a maximum flow, for instance of more than 0.6 1/min, preferably more than 0.7 1/min, most preferably more than 0.8 1/min, in particular more than 0.9 1/min, for instance more than 1.0 1/min, is achieved.
- a bypass line with a pressure-controlled bypass valve can be arranged between the regions of the ends of the pump segment.
- the bypass valve can open at a pressure from 100 to 500 mbar, preferably 200 to 400 mbar, most preferably 300 to 350 mbar.
- the clear cross-section of the bypass line with opened bypass valve can be 10 to 100%, preferably 20 to 50%, of the clear cross-section of the pump segment when not under tension.
- the clear cross-section is the total passage area for the fluid.
- elastomeric silicone polymers elastomeric silicone polymers, soft PVC or similar materials, which are known to the man skilled in the art.
- Typical inner diameters are in the range from 6 to 10 mm, preferably 7 to 9 mm, for instance 8 mm.
- Typical wall thicknesses are in the range from 1 to 2 mm, for instance 1.5 mm.
- the invention also concerns the use of a peristaltic hose pump according to the invention for generating a fluid flow through a medical instrument, wherein a fluid source is connected at a feeding side of the hose, wherein the medical instrument is connected at a pressure side of the hose and wherein the roller wheel is driven with a preselected and constant speed for feeding the fluid from the feeding side to the pressure side.
- a rotary switch or a key pad can be provided, and to each switch position respectively each key, a defined constant speed of the roller wheel is assigned, and the electric motor drive of which is correspondingly controlled.
- a continuous control element such as for instance a potentiometer, can also be provided.
- a digital entry respectively preselection of the speed by means of an input field is also possible.
- the fluid source is a fluid container, which is arranged, preferably by 0.1 to 2 m, most preferably 0.1 to 1 m, above the higher end of the pump segment, the fluid container communicating with the feeding side of the hose without interposed pump.
- the hose pump acts quasi as a booster for the hydrostatic pressure resulting from the arrangement of the fluid container. Compared to the classic bag suspension and height adjustment without pump, an increased flow through the medical instrument achieved being often medically desirable.
- FIG. 1 a schematic view of a peristaltic hose pump according to the invention.
- FIG. 2 the arrangement when using a peristaltic hose pump according to the invention in the field of medicine.
- the peristaltic hose pump comprises a roller wheel 1 which can be driven about a roller wheel axis D, said roller wheel 1 having rollers 2 that are mounted thereon, the roller wheel rotation axes of which R being arranged on a circle concentric with the roller wheel axis D, the rollers 2 partly projecting beyond the roller wheel 1 .
- the roller wheel axis D and the roller wheel rotation axes R extend in parallel to each other.
- the electric motor drive of the roller wheel is not shown, which is supplied with preselectable operating voltages.
- suitable power supply circuits are provided.
- a hose 3 which has a flexible and elastic pump segment 4 , in the embodiment made of an elastomeric silicone polymer.
- the pump segment 4 is fixed at its two opposite ends 5 , 6 in the axial direction, referred to the pump segment, by means of one fixing point P 1 , P 2 each.
- the fixing points P 1 , P 2 can allow a rotation of the end of the pump segment 4 about an axis orthogonal to the axial direction of the pump segment 4 .
- the pump segment 4 is shown in mounted condition, i.e. guided under elastic tension around the roller wheel 1 and when under tension.
- the pump segment 4 When under tension, the pump segment 4 has the length L 2 .
- the pump segment 4 When not under tension, i.e. not guided around the roller wheel 1 , the pump segment 4 has a length L 1 (not shown).
- the length L 1 is smaller than the length L 2 .
- the length is herein the longitudinal extension of the center axis through the pump segment 4 .
- the length L 1 of the pump segment 4 when not under tension is adjusted in proportion to the distance A of the fixing points P 1 , P 2 to the roller wheel axis D respectively to the length L 2 with the provision that while the roller wheel 1 is stationary and when applying a fluid pressure in the range of 100 mbar to one end P 1 , P 2 of the pump segment 4 , a flow of the fluid of approx. 0.3 1/min through the pump segment 4 is obtained.
- the distance A of one or both fixing points P 1 , P 2 to the roller wheel rotation axis D can be adjustable.
- the distance A will not be adjustable, and the length L 1 of the pump segment 4 has been adapted correspondingly in previous tests.
- a bypass line 7 with a pressure-controlled bypass valve 8 is arranged between the regions of the ends 5 , 6 of the pump segment 4 .
- the bypass valve 8 opens at a pressure of approx. 300 mbar.
- the bypass valve 8 may be carried out in most various ways. In the simplest case, it is a pressure-dependant mechanical control element, having a valve seat and a spring-loaded closing element that without any further control from outside opens against the spring force or closes with the spring force.
- the bypass line 7 may be a flexible hose, which extends in a clamping element.
- a clamping element comprises a supporting surface, against which the bypass line 7 rests, and a clamping actuator, which for instance can be driven by an electric motor, and which is pressed on the bypass line 7 on the side of the bypass line 7 opposite to the supporting surface and compresses the bypass line 7 against the supporting surface.
- FIG. 2 the use of the peristaltic hose pump according to the invention for generating a fluid flow through a medical instrument 11 is shown.
- a fluid source 12 is connected at the feeding side 9 of the hose 3 .
- the medical instrument 11 is connected, the end of which can for instance be introduced into a not shown body cavity.
- the roller wheel 1 is driven with a preselected and constant speed for feeding the fluid from the feeding side 9 to the pressure side 10 .
- a rotary switch 13 is provided for preselecting the desired constant speed.
- a continuously operating actuator can also be provided.
- the fluid source is a fluid container 12 , which is arranged approx. 1 m above the end 6 of the pump segment 4 . Between the fluid container 12 and the feeding side 9 of the hose 3 , there is no pump or the like interposed.
- a peristaltic hose pump according to the invention basically effects an increase of the hydrostatic pressure provided by the fluid container 12 .
- a test series for determining a suitable length L 2 is described.
- a peristaltic hose pump of the basic design of FIG. 1 was used.
- the distance A of the two fixing points P 1 , P 2 could be varied.
- a change of the distance A therefore corresponds to a change of the length L 2 by twice the change of the distance A.
- it is a standard hose pump and a standard pump segment 4 .
- the measurements were made with a structure according to FIG. 2 by means of a standard instrument as medical instrument, which was introduced into a dummy representing a body cavity.
- the dummy comprised an outflow cock.
- the fluid container was arranged at a level of approx. 1 m above the fixing point P 1 .
- the dummy was approx. at the level of the fixing point P 1 .
- the data in Table 1 were obtained.
- the parameter A is given in arbitrary relative units.
- Speed is the speed of the roller wheel. Graviflow designates the flow while the roller wheel is stationary. Flow indicates the maximum flow with opened outflow cock. Pressure in the dummy indicates the maximum pressure in the dummy with closed outflow cock. The values in parentheses are measured values that were taken again after 2 hours elapsed.
Abstract
The invention concerns a peristaltic hose pump comprising a roller wheel (1) rotatable about a roller wheel axis (D), which roller wheel has rollers that are mounted thereon (2), the roller wheel rotation axes (R) of which are arranged on a circle concentric with the roller wheel axis (D), the rollers (2) partly projecting beyond the roller wheel (1), comprising a hose (3), which has a flexible and elastic pump segment (4), and the pump segment (4) being fixable in the axial direction at its two opposite ends (5, 6) by means of one fixing point (P1, P2) each, and the pump segment (4) being guided around the roller wheel (1) under elastic tension, wherein the length (L1) of the pump segment (4) when not under tension in proportion to the distance (A) of the fixing points (P1, P2) to the roller wheel rotation axis (D) is adjusted with the provision that while the roller wheel (1) is stationary and when applying a fluid pressure in the range from 10 to 400 mbar to one end (P1, P2) of the pump segment (4), a flow of the fluid of at least 0.01 1/min through the pump segment (4) is obtained.
Description
- The invention concerns a peristaltic hose pump, in particular for use in the field of medicine, comprising a roller wheel, which can be driven about a roller wheel axis, and which has rollers that are mounted thereon, the roller wheel rotation axes of which are arranged on a circle concentric with the roller wheel axis, the rollers partly projecting beyond the roller wheel, comprising a hose, which has a flexible and elastic pump segment, the pump segment being fixable in the axial direction at its two opposite ends by means of one fixing point each, and the pump segment being guided around the roller wheel under elastic tension. The invention further concerns the use of such a peristaltic hose pump for generating a fluid flow through a medical instrument.
- Peristaltic hose pumps of the construction mentioned above are known in various variants. There are in principle two basic concepts. The first basic concept is that the hose arranged around the roller wheel is pressed by means of a pressure arched element or the like against the roller wheel. Such embodiments are for instance known from the documents U.S. Pat. No. 4,798,580 and U.S. Pat. No. 5,044,902. The second basic concept, on which the invention is based, consists in that the elastic hose is pulled by a tensile force of suitable size with a sufficient angle of wrapping, typically more than 90° and less than 270°, in most cases in the range from 150° to 220°, around the roller wheel. Thereby, a pressure arched element or the like is not necessary. The tensile force is dimensioned according to the elastic properties of the hose such that in the region of a roller of a roller wheel, the interior cross-section of the hose is reduced to practically zero. By rotation of this region with the roller about the roller wheel axis, the feed of the fluid in the hose is effected. Examples are described in the documents U.S. Pat. No. 4,537,561 and U.S. Pat. No. 5,213,483. A particularly advantageous variant of the second basic concept is described in the document DE 199 60 668 A1.
- It is common to all above peristaltic hose pumps that across a broad range there is a nearly linear correlation between the speed of the roller wheel and the flow, and in fact independently from the generated pressure respectively counter-pressure. In these connections it is however also known that with very high pressures respectively counter-pressures, typically above 530 mbar, the correlation between speed and flow becomes non-linear.
- When using peristaltic hose pumps in the field of medicine, for instance for generating a flow through a body cavity by introduction of a medical instrument, which is fed by means of the peristaltic hose pump with fluid, the pressure respectively counter-pressure is a critical parameter. A doctor wishes on the one hand a high flow for rinsing the body cavity. On the other hand, a certain pressure is in fact desirable for expanding the body cavity, this pressure is however also a very critical parameter. Approx. 500 mbar, better 400 mbar, should definitely not be exceeded. Typical pressures, which are medically harmless, are in the range from approx. 50 to 300 mbar.
- For peristaltic hose pumps of prior art construction, comprehensive safety measures are provided, in order to safely prevent an inadmissible pressure rise in a body cavity when adjusting a high flow. Typically, a pressure sensor is provided, which regularly monitors the pressure in the body cavity and/or the feed line to the medical instrument respectively the pressure side of the peristaltic pump and adjusts the drive of the roller wheel to smaller speeds, if the pressure is too high. It is even possible that the roller wheel is adjusted to reverse operation in the case of a strong pressure rise in the body cavity. This will in particular take place, when an inadmissibly high pressure could occur at a very small flow already.
- The above measurement and control measures are all in all expensive, thus prior art peristaltic hose pumps being costly. It would be desirable to provide a peristaltic hose pump for use in the field of medicine, the roller wheel speed of which is preselectable and otherwise constant, and in which a defined limit pressure cannot be exceeded for any of the preselectable speeds, and in fact without the necessity of suitable pressure sensors and control of the speed of the roller wheel.
- It is therefore the technical object of the invention to propose a peristaltic hose pump, which can be obtained in a simple construction, in particular does not need measurements of the pressure in the body cavity respectively on the pressure side of the peristaltic pump, nor control measures for the drive of the roller wheel, and which nevertheless safely excludes that a given maximum limit pressure is exceeded.
- For achieving this technical object, the invention teaches a peristaltic hose pump comprising a roller wheel, which can be driven about a roller wheel axis, and which has rollers that are mounted thereon, the roller wheel rotation axes of which are arranged on a circle concentric with the roller wheel axis, the rollers partly projecting beyond the roller wheel, comprising a hose, which has a flexible and elastic pump segment, the pump segment being fixable in the axial direction at its two opposite ends by means of one fixing point each, and the pump segment being guided around the roller wheel under elastic tension, wherein the length of the pump segment when not under tension in proportion to the distance of the fixing points to the roller wheel rotation axis is adjusted with the provision that while the roller wheel is stationary and when applying a fluid pressure in the range from 10 to 400 mbar to one end of the pump segment, a flow of the fluid of at least 0.01 1/min through the pump segment is obtained.
- The roller wheel is typically set into rotation by means of an electric motor drive, thereby the cross-section of the pump segment of the hose being reduced in the region of a roller. The speed of the roller wheel may be unregulated, for instance by applying a preselectable voltage (for analogous electric motors) or frequency (for stepper motors) to the electric motor drive. It is also possible to keep the speed of the roller wheel constant at a preselectable speed by a control loop. Then, a transducer, for instance a speedo dial, is typically arranged on the shaft of the roller wheel, by means of which a speed signal is generated. This speed signal is then compared in an analog or digital comparator with a preselected nominal signal. When the speed signal indicates a too low speed, compared with the nominal speed correlated with the nominal signal, the comparator increases the voltage respectively the frequency, which is applied to the electric motor drive. An essential element of the invention is that this control or regulation does not obtain nor need as input signal a signal of a pressure sensor arranged on the pressure side of the peristaltic hose pump.
- A pump segment of a hose is a partial length of the hose, which is made of an elastic and flexible material. At the ends of the pump segment respectively follow partial lengths of the hose, which in most cases, but not necessarily are made of another material and/or are differently dimensioned. The partial length of the hose, which forms the pump segment, is limited and defined by the fixing points. The fixing points are disposed in the geometric layout, related to directions orthogonal to the roller wheel axis, at defined and fixed points in the peristaltic pump. Thereby, the hose segment of a certain length is, after guiding it around the roller wheel, under an elastic tension given according to the length.
- The invention is based first of all on the finding that the reason for the non-linearity between speed and flow at high pressures is that with very high pressures, the interior cross-section of the hose respectively of the pump segment is reduced not to zero anymore in the region of a roller of the roller wheel because of the (counter-) pressure. Because of the pressure, there is therefore a backflow, referred to the reduced interior cross-section of the pump segment and the revolution thereof about the roller wheel axis, in opposition to the direction of rotation of the roller wheel and consequently the feed direction of the peristaltic hose pump. This backflow in turn is a function of the pressure and becomes the higher, the higher the pressure on the pressure side of the hose pump is.
- The invention makes use of this finding for adjusting a maximum attainable pressure in medically compatible pressure ranges, i.e., below 400 mbar, preferably below 300 mbar, by allowing the provision of a backflow at normal operating conditions already. By the fact that even while the roller wheel is stationary, a flow is already made possible, so to speak a defined back flow leakage in the region of the reduced interior cross-section of the pump segment in the region of a roller is provided. This back flow leakage acts quasi as a bypass valve from the pressure side to the feeding side of the hose.
- By a peristaltic hose pump according to the invention, it is achieved that with simplest design, namely without pressure-controlled regulation of the roller wheel drive and without pressure measurement and indication, nevertheless a hose pump for medical purposes meeting all safety requirements is obtained. A peristaltic hose pump according to the invention can thus be produced very cost-effectively. Further, its handling is extremely simple, since an operator only needs to select a defined speed, at which the roller wheel then constantly turns until another preselection. Even with maximum preselected speed, exceedance of a defined maximum admissible pressure value is inherently excluded.
- Essential for the invention is the set-up of the length of the elastic pump segment when not under tension in proportion to the distance of the fixing points to the roller wheel rotation axis. In other words, the set-up comprises the proportion of the length of the pump segment when not under tension to the length of the pump segment when the pump segment is guided under tension around the roller wheel by means of the fixing points.
- The set-up can in principle be provided in two different ways. On the one hand it is possible to vary the length of the pump segment when not under tension with fixing points being invariable with respect to the roller wheel axis. By a test series with different lengths of the pump segment when not under tension it can be tested, whether the flow according to the invention is provided when the pump segment is guided under tension around the roller wheel and while the roller wheel is stationary. Alternatively, with invariant length of the pump segment, the distance of a fixing point or the distances of both fixing points with respect to the roller wheel rotation axis can be varied and adjusted in a test series so that the flow according to the invention when the pump segment is guided under tension around the roller wheel and while the roller wheel is stationary. Depending on the employed hose material for the pump segment and its dimensions, the provision according to the invention can easily be adjusted by tests and assignment to the respective constructional design of the pump segment.
- In a peristaltic hose pump according to the invention, usually the distance of the fixing points to the roller wheel rotation axis will not be adjustable. Rather, regularly the length of the pump segment when not under tension is adapted thereto in the above manner. For test purposes respectively for the test series mentioned above of the second alternative, it is however also possible that a peristaltic hose pump is designed such that the distance of at least one fixing point to the roller wheel rotation axis is adjustable.
- For the purpose of a peristaltic hose pump according to the invention, other hoses can also be used. With unchanged distance of the fixing points to the roller wheel rotation axis, the length of the hose segment has been determined and adapted in a corresponding way for every type of a hose respectively hose segment. This may in particular have been made for instance with a hose cassette according to the document DE 199 60 668 A1, to which herewith reference comprehensively is made.
- Preferably, it is provided that while the roller wheel is stationary and when applying a fluid pressure in the range from 10 to 300 mbar, preferably from 10 to 200 mbar to one end of the pump hose segment, a flow of the fluid from 0.01 1/min to 1 1/min, preferably to 0.5 1/min, most preferably to 0.1 1/min is obtained.
- Alternatively respectively preferably, the set-up of the length of the pump segment when not under tension in proportion to the distance of the fixing points to the roller wheel axis is made with the provision that with maximum speed of the roller wheel and closed pressure side of the hose, a pressure of not more than 500 mbar, preferably of not more than 450 mbar, most preferably not more than 400 mbar, in particular not more than 350 mbar or 300 mbar, appears on the pressure side. In addition to this, an optimization of the flow can also simultaneously be made such that with the above maximum pressures a maximum flow, for instance of more than 0.6 1/min, preferably more than 0.7 1/min, most preferably more than 0.8 1/min, in particular more than 0.9 1/min, for instance more than 1.0 1/min, is achieved.
- As an additional safety measure against inadmissibly high pressures, a bypass line with a pressure-controlled bypass valve can be arranged between the regions of the ends of the pump segment. The bypass valve can open at a pressure from 100 to 500 mbar, preferably 200 to 400 mbar, most preferably 300 to 350 mbar. The clear cross-section of the bypass line with opened bypass valve can be 10 to 100%, preferably 20 to 50%, of the clear cross-section of the pump segment when not under tension. The clear cross-section is the total passage area for the fluid.
- Typically the following materials can be used for the pump segment: elastomeric silicone polymers, soft PVC or similar materials, which are known to the man skilled in the art. Typical inner diameters are in the range from 6 to 10 mm, preferably 7 to 9 mm, for
instance 8 mm. Typical wall thicknesses are in the range from 1 to 2 mm, for instance 1.5 mm. - The invention also concerns the use of a peristaltic hose pump according to the invention for generating a fluid flow through a medical instrument, wherein a fluid source is connected at a feeding side of the hose, wherein the medical instrument is connected at a pressure side of the hose and wherein the roller wheel is driven with a preselected and constant speed for feeding the fluid from the feeding side to the pressure side. For the preselection, typically a rotary switch or a key pad can be provided, and to each switch position respectively each key, a defined constant speed of the roller wheel is assigned, and the electric motor drive of which is correspondingly controlled. Instead of a rotary switch, a continuous control element, such as for instance a potentiometer, can also be provided. Of course, a digital entry respectively preselection of the speed by means of an input field is also possible.
- Preferably, the fluid source is a fluid container, which is arranged, preferably by 0.1 to 2 m, most preferably 0.1 to 1 m, above the higher end of the pump segment, the fluid container communicating with the feeding side of the hose without interposed pump. The hose pump acts quasi as a booster for the hydrostatic pressure resulting from the arrangement of the fluid container. Compared to the classic bag suspension and height adjustment without pump, an increased flow through the medical instrument achieved being often medically desirable.
- In the following, the invention is explained in more detail with reference to figures representing an example of execution only. There are:
-
FIG. 1 : a schematic view of a peristaltic hose pump according to the invention, and -
FIG. 2 : the arrangement when using a peristaltic hose pump according to the invention in the field of medicine. - In
FIG. 1 it can first be seen that the peristaltic hose pump comprises a roller wheel 1 which can be driven about a roller wheel axis D, said roller wheel 1 havingrollers 2 that are mounted thereon, the roller wheel rotation axes of which R being arranged on a circle concentric with the roller wheel axis D, therollers 2 partly projecting beyond the roller wheel 1. The roller wheel axis D and the roller wheel rotation axes R extend in parallel to each other. For reasons of clarity, the electric motor drive of the roller wheel is not shown, which is supplied with preselectable operating voltages. For this purpose, suitable power supply circuits are provided. - Furthermore, a
hose 3 is provided, which has a flexible and elastic pump segment 4, in the embodiment made of an elastomeric silicone polymer. The pump segment 4 is fixed at its twoopposite ends 5, 6 in the axial direction, referred to the pump segment, by means of one fixing point P1, P2 each. The fixing points P1, P2 can allow a rotation of the end of the pump segment 4 about an axis orthogonal to the axial direction of the pump segment 4. - In the representation of
FIG. 1 , the pump segment 4 is shown in mounted condition, i.e. guided under elastic tension around the roller wheel 1 and when under tension. When under tension, the pump segment 4 has the length L2. When not under tension, i.e. not guided around the roller wheel 1, the pump segment 4 has a length L1 (not shown). The length L1 is smaller than the length L2. The length is herein the longitudinal extension of the center axis through the pump segment 4. - The length L1 of the pump segment 4 when not under tension is adjusted in proportion to the distance A of the fixing points P1, P2 to the roller wheel axis D respectively to the length L2 with the provision that while the roller wheel 1 is stationary and when applying a fluid pressure in the range of 100 mbar to one end P1, P2 of the pump segment 4, a flow of the fluid of approx. 0.3 1/min through the pump segment 4 is obtained.
- For adjusting the above provision respectively for carrying-out test series for determining the suitable length L2, the distance A of one or both fixing points P1, P2 to the roller wheel rotation axis D can be adjustable. Usually, however, the distance A will not be adjustable, and the length L1 of the pump segment 4 has been adapted correspondingly in previous tests.
- Furthermore, it can be seen in
FIG. 1 that abypass line 7 with a pressure-controlledbypass valve 8 is arranged between the regions of theends 5, 6 of the pump segment 4. Thebypass valve 8 opens at a pressure of approx. 300 mbar. By means of thebypass line 8 and thebypass valve 8, if applicable an additional backflow for the pressure relief of thepressure side 10 is provided. Thebypass valve 8 may be carried out in most various ways. In the simplest case, it is a pressure-dependant mechanical control element, having a valve seat and a spring-loaded closing element that without any further control from outside opens against the spring force or closes with the spring force. By pressure application to the closing element, the latter will be moved against the spring force, when a predetermined maximum pressure value defined by the spring force is exceeded, and will come free from valve seat, so that fluid can drain respectively flow back from the pressure side through thebypass valve 8. Alternatively, thebypass line 7 may be a flexible hose, which extends in a clamping element. Such a clamping element comprises a supporting surface, against which thebypass line 7 rests, and a clamping actuator, which for instance can be driven by an electric motor, and which is pressed on thebypass line 7 on the side of thebypass line 7 opposite to the supporting surface and compresses thebypass line 7 against the supporting surface. Thereby, a continuous variation of the flow cross-section through thebypass line 7 and thus a continuous variation of the pressure can be obtained. - In
FIG. 2 , the use of the peristaltic hose pump according to the invention for generating a fluid flow through amedical instrument 11 is shown. At thefeeding side 9 of thehose 3, afluid source 12 is connected. At thepressure side 10 of thehose 3, themedical instrument 11 is connected, the end of which can for instance be introduced into a not shown body cavity. The roller wheel 1 is driven with a preselected and constant speed for feeding the fluid from the feedingside 9 to thepressure side 10. For preselecting the desired constant speed, arotary switch 13 is provided. Of course, instead of arotary switch 13, a continuously operating actuator can also be provided. InFIG. 2 it can further be seen that the fluid source is afluid container 12, which is arranged approx. 1 m above the end 6 of the pump segment 4. Between thefluid container 12 and thefeeding side 9 of thehose 3, there is no pump or the like interposed. - In particular in
FIG. 2 can be seen that a peristaltic hose pump according to the invention basically effects an increase of the hydrostatic pressure provided by thefluid container 12. - In the following, a test series for determining a suitable length L2 is described. For this purpose, a peristaltic hose pump of the basic design of
FIG. 1 was used. By a manually operated spindle drive, the distance A of the two fixing points P1, P2 could be varied. A change of the distance A therefore corresponds to a change of the length L2 by twice the change of the distance A. Besides that, it is a standard hose pump and a standard pump segment 4. - The measurements were made with a structure according to
FIG. 2 by means of a standard instrument as medical instrument, which was introduced into a dummy representing a body cavity. The dummy comprised an outflow cock. First, the flow with opened outflow cock was measured. Then the outflow cock was closed, and the resulting pressure in the dummy was measured. The fluid container was arranged at a level of approx. 1 m above the fixing point P1. The dummy was approx. at the level of the fixing point P1. The data in Table 1 were obtained. - The parameter A is given in arbitrary relative units. Speed is the speed of the roller wheel. Graviflow designates the flow while the roller wheel is stationary. Flow indicates the maximum flow with opened outflow cock. Pressure in the dummy indicates the maximum pressure in the dummy with closed outflow cock. The values in parentheses are measured values that were taken again after 2 hours elapsed.
-
TABLE 1 Pressure in A Speed Graviflow Flow the dummy [mm] [UpM} (l/min] [l/min] [mbar] −2 50 0.46 0.35 (0.40) 104 (103) −2 100 0.46 0.50 (0.50) 108 (117) −2 150 0.46 0.50 (0.50) 120 (138) −2 200 0.46 0.55 (0.55) 133 (159) −2 300 0.46 0.60 (0.70) 172 (212) 0 50 0.33 0.40 (0.35) 130 (139) 0 100 0.33 0.50 (0.50) 178 (208) 0 150 0.33 0.55 (0.60) 234 (258) 0 200 0.33 0.70 (0.75) 280 (305) 0 300 0.33 0.90 (1.00) 371 (391) 2 50 0.22 0.30 (0.25) 172 (212) 2 100 0.22 0.50 (0.55) 308 (323) 2 150 0.22 0.70 (0.75) 401 (397) 2 200 0.22 0.80 (0.85) 482 (461) 2 300 0.22 1.20 (1.20) 580 (559) 4 50 0 0.25 (0.25) 270 (322) 4 100 0 0.50 (0.55) 462 (450) 4 150 0 0.75 (0.75) 558 (551) 4 200 0 1.00 (1.00) 662 (620) 4 300 0 1.40 (1.35) 772 (738) 6 50 0 0.25 (0.25) 270 (404) 6 100 0 0.50 (0.55) 596 (584) 6 150 0 0.75 (0.75) 743 (712) 6 200 0 1.05 800 - It ca be seen that for A=−2, 0 and 2, the roller wheel 1 does not seal the pump segment 4. For A=−2, the attainable flow is relatively low. For A=0, the attainable flow is satisfactory. For A=−2 and 0, there are no maximum pressures of more than 400 mbar. The optimum adjustment is therefore A=0.
Claims (20)
1. A peristaltic hose pump comprising a roller wheel rotatable about a roller wheel axis (D), which roller wheel has rollers that are mounted thereon, the roller wheel rotation axes (R) of which are arranged on a circle concentric with the roller wheel axis (D), the rollers partly projecting beyond the roller wheel,
comprising a hose, which has a flexible and elastic pump segment,
and the pump segment being fixable in the axial direction at its two opposite ends by means of one fixing point (P1, P2) each,
and the pump segment being guided around the roller wheel under elastic tension, wherein the length of the pump segment when not under tension in proportion to the distance of the fixing points to the roller wheel rotation axis is adjusted with the provision that while the roller wheel is stationary and when applying a fluid pressure in the range from 10 to 400 mbar to one end (P1, P2) of the pump segment, a flow of the fluid of at least 0.01 1/min through the pump segment is obtained.
2. The peristaltic hose pump according to claim 1 , wherein the distance of at least one fixing point to the roller wheel axis is adjustable.
3. The peristaltic hose pump according to claim 1 , wherein while the roller wheel is stationary and when applying a fluid pressure in the range from 10 to 300 mbar, preferably from 10 to 200 mbar to one end of the pump segment, a flow of the fluid from 0.01 1/min to 1 1/min, preferably to 0.5 1/min is obtained.
4. The peristaltic hose pump according to claim 1 , wherein a bypass line with a pressure-controlled bypass valve is arranged between the regions of the ends of the pump segment.
5. The peristaltic hose pump according to claim 4 , wherein the bypass valve opens at a pressure from 100 to 500 mbar, preferably 200 to 400 mbar, most preferably 300 to 350 mbar.
6. The peristaltic hose pump according to claim 4 , wherein the minimum clear cross-section of the bypass line with opened bypass valve is 10 to 100%, preferably 20 to 50%, of the clear cross-section of the pump segment when not under tension.
7. The use of a peristaltic hose pump according claim 1 for generating a fluid flow through a medical instrument 11, wherein a fluid source is connected at a feeding side of the hose, wherein the medical instrument is connected at a pressure side of the hose, and wherein the roller wheel is driven with a preselected and constant speed for feeding the fluid from the feeding side to the pressure side.
8. The use of a peristaltic hose pump according to claim 7 , wherein the fluid source is a fluid container, which is arranged, preferably by 0.1 to 2 m, most preferably 0.1 to 1 m, above the higher end of the pump segment, the fluid container communicating with the feeding side of the hose without interposed pump.
9. The peristaltic hose pump according to claim 2 , wherein while the roller wheel is stationary and when applying a fluid pressure in the range from 10 to 300 mbar, preferably from 10 to 200 mbar to one end of the pump segment, a flow of the fluid from 0.01 1/min to 1 1/min, preferably to 0.5 1/min is obtained.
10. The peristaltic hose pump according to claim 5 , wherein the minimum clear cross-section of the bypass line with opened bypass valve is 10 to 100%, preferably 20 to 50%, of the clear cross-section of the pump segment when not under tension.
11. The use of a peristaltic hose pump according claim 2 for generating a fluid flow through a medical instrument 11, wherein a fluid source is connected at a feeding side of the hose, wherein the medical instrument is connected at a pressure side of the hose, and wherein the roller wheel is driven with a preselected and constant speed for feeding the fluid from the feeding side to the pressure side.
12. The use of a peristaltic hose pump according claim 3 for generating a fluid flow through a medical instrument 11, wherein a fluid source is connected at a feeding side of the hose, wherein the medical instrument is connected at a pressure side of the hose, and wherein the roller wheel is driven with a preselected and constant speed for feeding the fluid from the feeding side to the pressure side.
13. The use of a peristaltic hose pump according claim 4 for generating a fluid flow through a medical instrument 11, wherein a fluid source is connected at a feeding side of the hose, wherein the medical instrument is connected at a pressure side of the hose, and wherein the roller wheel is driven with a preselected and constant speed for feeding the fluid from the feeding side to the pressure side.
14. The use of a peristaltic hose pump according claim 5 for generating a fluid flow through a medical instrument 11, wherein a fluid source is connected at a feeding side of the hose, wherein the medical instrument is connected at a pressure side of the hose, and wherein the roller wheel is driven with a preselected and constant speed for feeding the fluid from the feeding side to the pressure side.
15. The use of a peristaltic hose pump according claim 6 for generating a fluid flow through a medical instrument 11, wherein a fluid source is connected at a feeding side of the hose, wherein the medical instrument is connected at a pressure side of the hose, and wherein the roller wheel is driven with a preselected and constant speed for feeding the fluid from the feeding side to the pressure side.
16. The use of a peristaltic hose pump according to claim 11 , wherein the fluid source is a fluid container, which is arranged, preferably by 0.1 to 2 m, most preferably 0.1 to 1 m, above the higher end of the pump segment, the fluid container communicating with the feeding side of the hose without interposed pump.
17. The use of a peristaltic hose pump according to claim 12 , wherein the fluid source is a fluid container, which is arranged, preferably by 0.1 to 2 m, most preferably 0.1 to 1 m, above the higher end of the pump segment, the fluid container communicating with the feeding side of the hose without interposed pump.
18. The use of a peristaltic hose pump according to claim 13 , wherein the fluid source is a fluid container, which is arranged, preferably by 0.1 to 2 m, most preferably 0.1 to 1 m, above the higher end of the pump segment, the fluid container communicating with the feeding side of the hose without interposed pump.
19. The use of a peristaltic hose pump according to claim 14 , wherein the fluid source is a fluid container, which is arranged, preferably by 0.1 to 2 m, most preferably 0.1 to 1 m, above the higher end of the pump segment, the fluid container communicating with the feeding side of the hose without interposed pump.
20. The use of a peristaltic hose pump according to claim 15 , wherein the fluid source is a fluid container, which is arranged, preferably by 0.1 to 2 m, most preferably 0.1 to 1 m, above the higher end of the pump segment, the fluid container communicating with the feeding side of the hose without interposed pump.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US14/589,597 US9470221B2 (en) | 2009-12-11 | 2015-01-05 | Peristaltic hose pump |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102009058279.7 | 2009-12-11 | ||
DE102009058279.7A DE102009058279B4 (en) | 2009-12-11 | 2009-12-11 | Peristaltic peristaltic pump |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US14/589,597 Continuation US9470221B2 (en) | 2009-12-11 | 2015-01-05 | Peristaltic hose pump |
Publications (1)
Publication Number | Publication Date |
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US20120051943A1 true US20120051943A1 (en) | 2012-03-01 |
Family
ID=43501511
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/965,185 Abandoned US20120051943A1 (en) | 2009-12-11 | 2010-12-10 | Peristaltic hose pump |
US14/589,597 Expired - Fee Related US9470221B2 (en) | 2009-12-11 | 2015-01-05 | Peristaltic hose pump |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
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US14/589,597 Expired - Fee Related US9470221B2 (en) | 2009-12-11 | 2015-01-05 | Peristaltic hose pump |
Country Status (3)
Country | Link |
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US (2) | US20120051943A1 (en) |
EP (1) | EP2333341A1 (en) |
DE (1) | DE102009058279B4 (en) |
Families Citing this family (1)
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CN105201795B (en) * | 2015-10-14 | 2017-09-05 | 保定兰格恒流泵有限公司 | A kind of floating briquetting device, pump head and peristaltic pump |
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US4537561A (en) * | 1983-02-24 | 1985-08-27 | Medical Technology, Ltd. | Peristaltic infusion pump and disposable cassette for use therewith |
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US20080154182A1 (en) * | 2006-12-20 | 2008-06-26 | Robert Martin | Dual diameter arthroscopic irrigation/aspiration peristaltic pump system |
US20100150759A1 (en) * | 2005-12-01 | 2010-06-17 | Mazur Daniel E | Pulsatile rotary ventricular pump |
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US3877609A (en) * | 1971-09-13 | 1975-04-15 | Baxter Laboratories Inc | Measured dosing dispenser utilizing flow line deformer and method of dispensing |
US3816035A (en) * | 1972-10-24 | 1974-06-11 | E Malbec | Peristaltic pump |
FR2276483A1 (en) * | 1974-06-25 | 1976-01-23 | Malbec Edouard | PERISTALTIC PUMP AND TUBE FOR SUCH A PUMP |
US4798580A (en) | 1987-04-27 | 1989-01-17 | Site Microsurgical Systems, Inc. | Disposable peristaltic pump cassette system |
JP2529873B2 (en) * | 1987-12-01 | 1996-09-04 | 篤信 坂本 | High speed tube pump |
FR2644212B1 (en) | 1989-03-13 | 1991-11-15 | Malbec Edouard | CASSETTE FOR PERISTALTIC PUMP WITH DEFORMABLE TUBE, AND PERISTALTIC PUMP EQUIPPED WITH SUCH A CASSETTE |
US5814004A (en) * | 1989-09-22 | 1998-09-29 | Tamari; Yehuda | System for regulating pressure within an extracorporeal circuit |
US5213483A (en) | 1991-06-19 | 1993-05-25 | Strato Medical Corporation | Peristaltic infusion pump with removable cassette and mechanically keyed tube set |
DE19960668C1 (en) * | 1999-12-15 | 2001-08-16 | W O M Gmbh Physikalisch Medizi | Hose cassette for a peristaltic pump |
JP2002089455A (en) * | 2000-09-12 | 2002-03-27 | Teikku Kk | Blood pump |
JP3424681B1 (en) * | 2001-09-12 | 2003-07-07 | セイコーエプソン株式会社 | Liquid ejection device and device equipped with liquid ejection device |
EP1664535B1 (en) * | 2003-06-06 | 2011-03-16 | Innolab GmbH | Peristaltic pump |
-
2009
- 2009-12-11 DE DE102009058279.7A patent/DE102009058279B4/en not_active Expired - Fee Related
-
2010
- 2010-12-10 US US12/965,185 patent/US20120051943A1/en not_active Abandoned
- 2010-12-10 EP EP10014968A patent/EP2333341A1/en not_active Withdrawn
-
2015
- 2015-01-05 US US14/589,597 patent/US9470221B2/en not_active Expired - Fee Related
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
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US4537561A (en) * | 1983-02-24 | 1985-08-27 | Medical Technology, Ltd. | Peristaltic infusion pump and disposable cassette for use therewith |
US5052900A (en) * | 1990-04-11 | 1991-10-01 | Austin Jon W | Pressure relief valve for positive pressure pumps |
US5215450A (en) * | 1991-03-14 | 1993-06-01 | Yehuda Tamari | Innovative pumping system for peristaltic pumps |
US7168930B2 (en) * | 2003-09-29 | 2007-01-30 | Bausch & Lomb Incorporated | Peristaltic pump with air venting via the movement of a pump head or a backing plate during surgery |
US20100150759A1 (en) * | 2005-12-01 | 2010-06-17 | Mazur Daniel E | Pulsatile rotary ventricular pump |
US20080154182A1 (en) * | 2006-12-20 | 2008-06-26 | Robert Martin | Dual diameter arthroscopic irrigation/aspiration peristaltic pump system |
Also Published As
Publication number | Publication date |
---|---|
US9470221B2 (en) | 2016-10-18 |
EP2333341A1 (en) | 2011-06-15 |
DE102009058279A1 (en) | 2011-06-16 |
US20150198152A1 (en) | 2015-07-16 |
DE102009058279B4 (en) | 2016-05-12 |
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