CA1199525A - Vacuum driven pulsatile pump - Google Patents
Vacuum driven pulsatile pumpInfo
- Publication number
- CA1199525A CA1199525A CA000410447A CA410447A CA1199525A CA 1199525 A CA1199525 A CA 1199525A CA 000410447 A CA000410447 A CA 000410447A CA 410447 A CA410447 A CA 410447A CA 1199525 A CA1199525 A CA 1199525A
- Authority
- CA
- Canada
- Prior art keywords
- elastic member
- chamber
- housing
- outlet
- pressure
- 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.)
- Expired
Links
Classifications
-
- 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
- F04B43/08—Machines, pumps, or pumping installations having flexible working members having tubular flexible members
- F04B43/10—Pumps having fluid drive
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- External Artificial Organs (AREA)
- Reciprocating Pumps (AREA)
- Jet Pumps And Other Pumps (AREA)
- Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
Abstract
VACUUM DRIVEN PULSATILE PUMP
ABSTRACT OF THE DISCLOSURE
A vacuum powered fluid pump develops a pulsatile flow for transferring fluids in a peristaltic manner.
ABSTRACT OF THE DISCLOSURE
A vacuum powered fluid pump develops a pulsatile flow for transferring fluids in a peristaltic manner.
Description
5.~
BACKGROUND AND_SUMMARY_OF THE INVENTION
This invention relates to fluid pumps intended fo~ use at relatively low pressure levels and particularly, to pumps which may be operated by connection to a vacuum source. The inven-tion is useful particularly (although not exclusively) in medi-cal environments, such as in operating rooms, where a source of vacuum is readily available at all times.
In medical and operating room environments, low flow output pumps which are operable in a pulsatile or peristaltic manner, have a variety of uses. F~r example, they can be used to draw fluids from closed wounds and to deliver the fluids to a stor-age receptacle. They may be used as stomach pumps. Such a device may be used to collect blood and/or to effect trans-fusion from a donor to a donee. Low pressure, pulsatile pumps also are useful in kidney dialysis techniques to transfer blood to and from the dialysis machine. ~ow output pumps having a pulsatile, peristaltic mode of operation also are usable in connection with wound or o~an irrigation and debridement.
In accordance with the present invention, a simple yet effective device is provided and includes an expandable elastic element, preferably in the form of a sleeve, having an inlet end and an outlet end. The sleeve is contained within and extends through a relatively rigid vacuum chamber which is connectible to a vacuum source. The vacuum chamber surrounds the elastic sleeve so that when the vacuum is applied to the chamber the sleeve will expand. A check valve i5 located at
BACKGROUND AND_SUMMARY_OF THE INVENTION
This invention relates to fluid pumps intended fo~ use at relatively low pressure levels and particularly, to pumps which may be operated by connection to a vacuum source. The inven-tion is useful particularly (although not exclusively) in medi-cal environments, such as in operating rooms, where a source of vacuum is readily available at all times.
In medical and operating room environments, low flow output pumps which are operable in a pulsatile or peristaltic manner, have a variety of uses. F~r example, they can be used to draw fluids from closed wounds and to deliver the fluids to a stor-age receptacle. They may be used as stomach pumps. Such a device may be used to collect blood and/or to effect trans-fusion from a donor to a donee. Low pressure, pulsatile pumps also are useful in kidney dialysis techniques to transfer blood to and from the dialysis machine. ~ow output pumps having a pulsatile, peristaltic mode of operation also are usable in connection with wound or o~an irrigation and debridement.
In accordance with the present invention, a simple yet effective device is provided and includes an expandable elastic element, preferably in the form of a sleeve, having an inlet end and an outlet end. The sleeve is contained within and extends through a relatively rigid vacuum chamber which is connectible to a vacuum source. The vacuum chamber surrounds the elastic sleeve so that when the vacuum is applied to the chamber the sleeve will expand. A check valve i5 located at
-2-~95~.5 each of the inlet and outlet ends o~ the sleeve to assure that flow through the sleeve will be unidirectional. When vacuum is applied, the reduced pressure surrounding the elastic sleeve causes the sleeve to expand as fluid is drawn in through the inlet through the open inlet check valve.
In an automatically operating embodiment of the invention, expansion of and ingestion of fluid into the elastic sleeve continues until the elastic sleeve has expanded to a predeter-mined size at which time the expansion of the sleeve triggers a valve which vents the vacuum chamber to the atmosphere. hhen the vacuum chamber vents, the elastic sleeve contracts, thereby shutting the inlet check valve and forcing the fluid rom the elastic sleeve through the outlet check valve and into the delivery line. The resilient collapse of the elastic sleeve also closes or enables closing of the venting valve to enable the suction to begin a new pumping cycle.
The invention also includes manually operable embodiments of the invention by which the ~requency and extent of pumping action is controllable manually.
It is among the general objects of the invention to provide a pump which develops a pulsatile, psristaltic action.
Another object of the invention is to provide a pump of the type described which is vacuum powered.
Another object of the invention is to provide a pulsatile, peristaltic action pump which displays a gentle pumping action and is suited for use in medical and surgical environments ~ '~63~35XS
where delicacy of pumping action is among the prime considera-tions.
Another object of the invention is to provide pumping devices of the type described which are operable both autornat-ically as well as manually.
Still another object of the invention is to provide a pump of the type described which is of simple, inexpensive con-struction and which lends itself to disposable use.
DESCRIPTION OF THE DRAWINGS
The foregoing and other objects and advantages of the invention will be appreciated more fully from the followin~
further description thereof, with reference to the accompanying drawings wherein:
FIG. 1 is a broken-away diagrammatic illustration of the device;
FIG. 2 is a longitudinal section of the device illustrating the manner in which the elastic element expands to ingest fluid;
FIG, 3 is an illustration similar to FIG. 2 diagrammatic-ally illustrating the device when it vents to the atmosphere to effect a pulsatile pumping action of the elastic element;
FIG. 4 is an illustration of a modification to the device shown in FIGS. 1-3 by which the automatic venting action can be manually overridden and controlled;
FIG. 5 is an illustration of a completely manually operable embodiment of the invention.
1~99~~5 DESCRIPTION OF THE ILLUSTRATIVE EM~ODIMENTS
FIG. 1 illustrates diagrammatically the functional elements of an automatically operable embodiment of the device. The device includes a rigid housing 10 which may be molded from plastic or the like. The housing may take any of a variety of shapes, depending in part on the particular environment and manner in which the device is to be used. For example, only the housing may take the form of a conveniently hand-held elon-gate device or may take the form of a cannister to which vari-ous lines, hoses and nozzles may be connected. The housing 10in the illustrative embodiment includes an inlet end 12 and an outlet end 14. An elastic sleeve 16 extends through the hous-ing 10 from the inlet end 12 of the housing 10 to the outlet end 14. m e ends of the elastic sleeve 16 are hermetically sealed to the inlet and outlet ends of the housing, illustrated diagrammatically by everted ends 18 of the elastic sleeve 16.
A check valve 20, 22 is associated with each of the inlet and outlet ends of the device. The inlet check valve 20 is selected to permit flow only from the inlet 12 into the elastic sleeve 16 and the outlet valve 22 is arranged only to permit flow from the elastic sleeve 16 to the outlet 14. The check valves 20, 22 may be of any convenient design consistent with the intended use of the device. For example, they may be ball check or duck bill valves, mounted in tubing connectors 24, 26 which define the inlet and outlet.
~995~'S
m e housing is provided with a fitting 28 which is connect-ible to a vacuum line which, in turn, may be connected to a vacuum source as is conveniently found in an operating room or other hospital or surgical environment. The vacuum lLne pref~
erably is provided with a variable restrictor valve (not shown) to shut off or restrict the rate of evacuation from the vacuum chamber of the device.
From the foregoing, it will be appreciated that the inter-ior of the housing 10 may be considered as defining a variable vo}ume pumping chamber 30 (defined by the interior volume of the elastic sleeve 16) and a surrounding or annular vacuum chamber 32. In operation, as a vacuum develops in the vacuum chamber 32, the elastic sleeve will expand, ingesting and draw-ing fluid into the pumping chamber 3~ through the inlet tube and the check valve 20. During this mode of operation, the outlet check valve 22 remains closed.
m e volume which will be ingested and pumped by the pump chamber 30 is a direct function of the extent to which the sleeve 16 is permitted to expand. To that end, the device includes a relief valve 34 which is located on the housing 10 so as to be tripped by the transversely expanding sleeve 16 when the pump chamber 32 has reached a predetermined volume.
In the diagrammatic illustrative embodiment of the invention, the relief valve 34 is mounted in the chamber housing 10 and extends through a vent opening 36 formed in the housing 1~.
The valve 34 includes a valve element 38 which is illustrated ~!~9~5.~
as being in the form of a pad. The valve element 38 cooperates with a valve seat 40 which surrounds the vent 36. The valve element 38 normally bears against the valve seat 40 to maintain the valve opening 36 closed as shown in FIGS. 1 and 2. m e valve arrangement 34 also includes an inwardly extending valve stem 42 which extends inwardly from the valve member 38 through the opening 36. The inner end of the valve stem 42 terminates in a valve pad 44 which is engageable by the transversely expanding elastic sleeve 16. m e valve may be biased in its closed, seated relation on the valve seat 40 by a supplemental spring or biasing means, as illustrated diagramatically by the leaf spring 46. From the foregoing, it will be appreciated that when the elastic pumping chamber 30 has expanded to a pre-determined size, it wi}l engage the valve pad 44 and continued expansion of the sleeve will shift the valve 44 to open it and permit atmospheric air to rush in through the valve opening 36. The magnitude of vacuum and the size of the valve opening 36 may be selected so that the rate of admission of air through the valve opening 36 will be sufficiently greater than the rate of air flow through the vacuum line as to enable the elastic sleeve to return to its reduced volume within a predetermined time interval. mus, by adjusting these parameters, the char-acteristics, such as frequency, of the pulsatile pump action can be varied.
~ hen the valve opens, the elastic nature of the sleeve causes the sleeve to constrict, thereby forcing fluid contained 35~5 in the elastic pumping chamber 30, outwardly through the outlet check valve 22 and into the outlet tube 14. When the elastic pump chamber 30 has contracted to an extent at which the relief valve 34 can reclose, the cycle begins anew.
From the foregoing, it will be appreciated that the device is usable either or both as a suctioning device or as a fluid delivery device. The device may be used in closed wound suctioning, for example, of the abdominal cavity, in which the inlet 24 may be connected to a conventional closed-wound drain-age tube and the level of vacuum in the vacuum line and rate ofevacuation from the chamber adjusted to provide the desired suctioning and pumping effect. Alternately, the device could be used as a stomach pump to effect gentle, yet firm peristaltic pumping of material from the patient's stomach. As an output delivery device, the inlet tube may be inserted into a sterile irrigating or debridement solution and the outlet end may be connected to a tube which in turn is provided with a suitable nozzle or shower-like element at its outlet end. The fluid pumping action is suited particularly to those situations where it is important to have a gentle action and where high speed, forceful, high frequency jets are undesirable, as for example, when the surface of delicate organs or delicate wounds are being cleaned. In this regard, it may be noted that the pumping pressures utilized in the present invention may be relatively low, and typically may be well under one atmosphere. mis results from the ability of the device to be ~ i9 9 Sf~ 5 operated between a low pressure equal to the maximum vacuum available at the particular source and atmospheric pressure.
Durin~ operation of the device, the vacuum within the vacuum chamber may be varied between atmospheric and a selected level of vacuum, as desired.
FIG. 4 illustrates a modification to the device in the form of an aperture 50 formed in the housing 10 at a convenient loc-ation where it can be covered or uncovered by the user's fing-er. The provision of the opening 5Q in the housing 10 provides the user with a convenient on-off control. The device may be disabled, effectively to an "off" configuration by uncovering the hole 50 thereby continuously venting the cnamber 32 to the atmosphere. When it is desired to resume operation of the device, the aperture 50 need only be covered to enable the vacuum to be developed within the chamber 32. In addition to providing an on-off control, the aperture may be selectively blocked or unblocked to vary frequency of operation of the automatic valving arrangement by varying the extent to which the aperture is obstructed. Additionally, the aperture may be covered or uncovered at a rapid rate, faster than the normal, automatic frequency of operation of the device, thereby provid-ing substantially, completely manual mode of operation.
In some instances, it may be preferable simply to provide a device which is completely manually operable. FIG. 5 illus-trates a device which is essentially the same as that discussed previously except that it completely omits the automatic valv-_9_ 1~995~5 ing arrangement and, instead, provides simply a manuallycontrollable apertura. Here, the frequency is completely controlled by the user by opening and closing the aperture 50, to an extent and at a rate which suits the particular needs and reguirements of the moment.
In addition, it will be appreciated that the various embod-iments of the invention are relatively simple in construction and operation and, as such, lend themselves to disposable use.
It should be understood that while the foregoing descrip-tion of the invention is intended to be diagrammatic and illus-trative only, other embodiments, modifications and uses may be apparent to those skilled in the art without departing frsm the spirit of the invention.
Having thus described the invention, what I desire to claim and secure by Letters Patent is:
In an automatically operating embodiment of the invention, expansion of and ingestion of fluid into the elastic sleeve continues until the elastic sleeve has expanded to a predeter-mined size at which time the expansion of the sleeve triggers a valve which vents the vacuum chamber to the atmosphere. hhen the vacuum chamber vents, the elastic sleeve contracts, thereby shutting the inlet check valve and forcing the fluid rom the elastic sleeve through the outlet check valve and into the delivery line. The resilient collapse of the elastic sleeve also closes or enables closing of the venting valve to enable the suction to begin a new pumping cycle.
The invention also includes manually operable embodiments of the invention by which the ~requency and extent of pumping action is controllable manually.
It is among the general objects of the invention to provide a pump which develops a pulsatile, psristaltic action.
Another object of the invention is to provide a pump of the type described which is vacuum powered.
Another object of the invention is to provide a pulsatile, peristaltic action pump which displays a gentle pumping action and is suited for use in medical and surgical environments ~ '~63~35XS
where delicacy of pumping action is among the prime considera-tions.
Another object of the invention is to provide pumping devices of the type described which are operable both autornat-ically as well as manually.
Still another object of the invention is to provide a pump of the type described which is of simple, inexpensive con-struction and which lends itself to disposable use.
DESCRIPTION OF THE DRAWINGS
The foregoing and other objects and advantages of the invention will be appreciated more fully from the followin~
further description thereof, with reference to the accompanying drawings wherein:
FIG. 1 is a broken-away diagrammatic illustration of the device;
FIG. 2 is a longitudinal section of the device illustrating the manner in which the elastic element expands to ingest fluid;
FIG, 3 is an illustration similar to FIG. 2 diagrammatic-ally illustrating the device when it vents to the atmosphere to effect a pulsatile pumping action of the elastic element;
FIG. 4 is an illustration of a modification to the device shown in FIGS. 1-3 by which the automatic venting action can be manually overridden and controlled;
FIG. 5 is an illustration of a completely manually operable embodiment of the invention.
1~99~~5 DESCRIPTION OF THE ILLUSTRATIVE EM~ODIMENTS
FIG. 1 illustrates diagrammatically the functional elements of an automatically operable embodiment of the device. The device includes a rigid housing 10 which may be molded from plastic or the like. The housing may take any of a variety of shapes, depending in part on the particular environment and manner in which the device is to be used. For example, only the housing may take the form of a conveniently hand-held elon-gate device or may take the form of a cannister to which vari-ous lines, hoses and nozzles may be connected. The housing 10in the illustrative embodiment includes an inlet end 12 and an outlet end 14. An elastic sleeve 16 extends through the hous-ing 10 from the inlet end 12 of the housing 10 to the outlet end 14. m e ends of the elastic sleeve 16 are hermetically sealed to the inlet and outlet ends of the housing, illustrated diagrammatically by everted ends 18 of the elastic sleeve 16.
A check valve 20, 22 is associated with each of the inlet and outlet ends of the device. The inlet check valve 20 is selected to permit flow only from the inlet 12 into the elastic sleeve 16 and the outlet valve 22 is arranged only to permit flow from the elastic sleeve 16 to the outlet 14. The check valves 20, 22 may be of any convenient design consistent with the intended use of the device. For example, they may be ball check or duck bill valves, mounted in tubing connectors 24, 26 which define the inlet and outlet.
~995~'S
m e housing is provided with a fitting 28 which is connect-ible to a vacuum line which, in turn, may be connected to a vacuum source as is conveniently found in an operating room or other hospital or surgical environment. The vacuum lLne pref~
erably is provided with a variable restrictor valve (not shown) to shut off or restrict the rate of evacuation from the vacuum chamber of the device.
From the foregoing, it will be appreciated that the inter-ior of the housing 10 may be considered as defining a variable vo}ume pumping chamber 30 (defined by the interior volume of the elastic sleeve 16) and a surrounding or annular vacuum chamber 32. In operation, as a vacuum develops in the vacuum chamber 32, the elastic sleeve will expand, ingesting and draw-ing fluid into the pumping chamber 3~ through the inlet tube and the check valve 20. During this mode of operation, the outlet check valve 22 remains closed.
m e volume which will be ingested and pumped by the pump chamber 30 is a direct function of the extent to which the sleeve 16 is permitted to expand. To that end, the device includes a relief valve 34 which is located on the housing 10 so as to be tripped by the transversely expanding sleeve 16 when the pump chamber 32 has reached a predetermined volume.
In the diagrammatic illustrative embodiment of the invention, the relief valve 34 is mounted in the chamber housing 10 and extends through a vent opening 36 formed in the housing 1~.
The valve 34 includes a valve element 38 which is illustrated ~!~9~5.~
as being in the form of a pad. The valve element 38 cooperates with a valve seat 40 which surrounds the vent 36. The valve element 38 normally bears against the valve seat 40 to maintain the valve opening 36 closed as shown in FIGS. 1 and 2. m e valve arrangement 34 also includes an inwardly extending valve stem 42 which extends inwardly from the valve member 38 through the opening 36. The inner end of the valve stem 42 terminates in a valve pad 44 which is engageable by the transversely expanding elastic sleeve 16. m e valve may be biased in its closed, seated relation on the valve seat 40 by a supplemental spring or biasing means, as illustrated diagramatically by the leaf spring 46. From the foregoing, it will be appreciated that when the elastic pumping chamber 30 has expanded to a pre-determined size, it wi}l engage the valve pad 44 and continued expansion of the sleeve will shift the valve 44 to open it and permit atmospheric air to rush in through the valve opening 36. The magnitude of vacuum and the size of the valve opening 36 may be selected so that the rate of admission of air through the valve opening 36 will be sufficiently greater than the rate of air flow through the vacuum line as to enable the elastic sleeve to return to its reduced volume within a predetermined time interval. mus, by adjusting these parameters, the char-acteristics, such as frequency, of the pulsatile pump action can be varied.
~ hen the valve opens, the elastic nature of the sleeve causes the sleeve to constrict, thereby forcing fluid contained 35~5 in the elastic pumping chamber 30, outwardly through the outlet check valve 22 and into the outlet tube 14. When the elastic pump chamber 30 has contracted to an extent at which the relief valve 34 can reclose, the cycle begins anew.
From the foregoing, it will be appreciated that the device is usable either or both as a suctioning device or as a fluid delivery device. The device may be used in closed wound suctioning, for example, of the abdominal cavity, in which the inlet 24 may be connected to a conventional closed-wound drain-age tube and the level of vacuum in the vacuum line and rate ofevacuation from the chamber adjusted to provide the desired suctioning and pumping effect. Alternately, the device could be used as a stomach pump to effect gentle, yet firm peristaltic pumping of material from the patient's stomach. As an output delivery device, the inlet tube may be inserted into a sterile irrigating or debridement solution and the outlet end may be connected to a tube which in turn is provided with a suitable nozzle or shower-like element at its outlet end. The fluid pumping action is suited particularly to those situations where it is important to have a gentle action and where high speed, forceful, high frequency jets are undesirable, as for example, when the surface of delicate organs or delicate wounds are being cleaned. In this regard, it may be noted that the pumping pressures utilized in the present invention may be relatively low, and typically may be well under one atmosphere. mis results from the ability of the device to be ~ i9 9 Sf~ 5 operated between a low pressure equal to the maximum vacuum available at the particular source and atmospheric pressure.
Durin~ operation of the device, the vacuum within the vacuum chamber may be varied between atmospheric and a selected level of vacuum, as desired.
FIG. 4 illustrates a modification to the device in the form of an aperture 50 formed in the housing 10 at a convenient loc-ation where it can be covered or uncovered by the user's fing-er. The provision of the opening 5Q in the housing 10 provides the user with a convenient on-off control. The device may be disabled, effectively to an "off" configuration by uncovering the hole 50 thereby continuously venting the cnamber 32 to the atmosphere. When it is desired to resume operation of the device, the aperture 50 need only be covered to enable the vacuum to be developed within the chamber 32. In addition to providing an on-off control, the aperture may be selectively blocked or unblocked to vary frequency of operation of the automatic valving arrangement by varying the extent to which the aperture is obstructed. Additionally, the aperture may be covered or uncovered at a rapid rate, faster than the normal, automatic frequency of operation of the device, thereby provid-ing substantially, completely manual mode of operation.
In some instances, it may be preferable simply to provide a device which is completely manually operable. FIG. 5 illus-trates a device which is essentially the same as that discussed previously except that it completely omits the automatic valv-_9_ 1~995~5 ing arrangement and, instead, provides simply a manuallycontrollable apertura. Here, the frequency is completely controlled by the user by opening and closing the aperture 50, to an extent and at a rate which suits the particular needs and reguirements of the moment.
In addition, it will be appreciated that the various embod-iments of the invention are relatively simple in construction and operation and, as such, lend themselves to disposable use.
It should be understood that while the foregoing descrip-tion of the invention is intended to be diagrammatic and illus-trative only, other embodiments, modifications and uses may be apparent to those skilled in the art without departing frsm the spirit of the invention.
Having thus described the invention, what I desire to claim and secure by Letters Patent is:
Claims (17)
1. A pulsatile pump operable to develop two strokes including a filling stroke and an ejection stroke, said pump comprising;
a housing;
an elastic member within the housing arranged to divide the housing into a first chamber and a second chamber;
said first chamber having an inlet and an outlet, said inlet, first chamber and outlet defining a flow path for fluid to be pumped;
means for directing flow so as to be unidirectional along the flow path, from the inlet to the outlet;
means for developing a pressure in the second chamber different from the pressure in the first chamber thereby to induce a pressure differential across the elastic member, said pressure differential effecting flexure of the elastic member in one of said strokes;
the other of said strokes being effected solely by the resilience of the elastic member;
means responsive to said flexure of the elastic member in said first stroke to abruptly terminate the pressure differential thereby enabling said elastic member to effect said other stroke under the influence of the resilience of the elastic member;
said second chamber being normally sealed and being provided with a normally closed vent means;
said means for terminating abruptly said pressure differential comprising said vent means being triggerable by said movement of said elastic member in said one stroke.
a housing;
an elastic member within the housing arranged to divide the housing into a first chamber and a second chamber;
said first chamber having an inlet and an outlet, said inlet, first chamber and outlet defining a flow path for fluid to be pumped;
means for directing flow so as to be unidirectional along the flow path, from the inlet to the outlet;
means for developing a pressure in the second chamber different from the pressure in the first chamber thereby to induce a pressure differential across the elastic member, said pressure differential effecting flexure of the elastic member in one of said strokes;
the other of said strokes being effected solely by the resilience of the elastic member;
means responsive to said flexure of the elastic member in said first stroke to abruptly terminate the pressure differential thereby enabling said elastic member to effect said other stroke under the influence of the resilience of the elastic member;
said second chamber being normally sealed and being provided with a normally closed vent means;
said means for terminating abruptly said pressure differential comprising said vent means being triggerable by said movement of said elastic member in said one stroke.
2. A peristaltic pulsatile pump comprising:
a hollow elastic member having an inlet and an outlet and defining a flow path within the elastic member between the inlet and the outlet;
check valve means for effecting unidirectional flow along the flow path;
a variable pressure chamber, the elastic member being confined at least in part by the pressure chamber and being hermetically sealed with respect to the pressure chamber;
means for effecting oscillatory variations in the pressure within the chamber each of oscillations including a cycle in which the elastic member is expanded to draw material to be pumped into the elastic member; and said means for effecting said oscillatory variations including vent means for venting the pressure chamber when the elastic member is in an expanded state, said vent means being constructed and arranged to enable substantial equalization of the pressures within the elastic member and pressure chamber whereby said elastic member may contract to effect a pumping action on the material within the elastic member, thereby to pump the material toward the outlet;
said pumping action of said elastic member comprising the sole force for pumping the material through the outlet.
a hollow elastic member having an inlet and an outlet and defining a flow path within the elastic member between the inlet and the outlet;
check valve means for effecting unidirectional flow along the flow path;
a variable pressure chamber, the elastic member being confined at least in part by the pressure chamber and being hermetically sealed with respect to the pressure chamber;
means for effecting oscillatory variations in the pressure within the chamber each of oscillations including a cycle in which the elastic member is expanded to draw material to be pumped into the elastic member; and said means for effecting said oscillatory variations including vent means for venting the pressure chamber when the elastic member is in an expanded state, said vent means being constructed and arranged to enable substantial equalization of the pressures within the elastic member and pressure chamber whereby said elastic member may contract to effect a pumping action on the material within the elastic member, thereby to pump the material toward the outlet;
said pumping action of said elastic member comprising the sole force for pumping the material through the outlet.
3. A device as defined in claim 2 further comprising:
means for varying the pressure within the chamber within a range no greater than one atmosphere of pressured.
means for varying the pressure within the chamber within a range no greater than one atmosphere of pressured.
4. A device as defined in claim 2 wherein the means for effecting said oscillatory pressure variations is contracted and arranged so as to be operable automatically.
5. A device as defined in claim 2 wherein the means for effecting said oscillatory pressure variations comprises manually operable means.
6. A peristaltic pulsatile pump comprising:
a housing defining a vacuum chamber and having an inlet and an outlet end;
an elastic member extending from the inlet and to the outlet end of the chamber and separating the chamber into a vacuum chamber and a pumping chamber, the vacuum chamber surrounding the pumping chamber, the elastic member being expandable in response to vacuum within the vacuum chamber;
means for connecting the vacuum to a source of vacuum;
check valve means associated with each of the inlet and outlet ends of the device to effect unidirectional flow therethrough; and vent means associated with the vacuum chamber to enable admission of atmospheric air into the vacuum chamber, thereby disrupting the expansion of the elastic member and enabling the resilience of the elastic member to contract and effect a pumping action on the material within the pumping chamber, said resilient contracting action of said elastic member providing the sole pumping force on the said material within the pumping member.
a housing defining a vacuum chamber and having an inlet and an outlet end;
an elastic member extending from the inlet and to the outlet end of the chamber and separating the chamber into a vacuum chamber and a pumping chamber, the vacuum chamber surrounding the pumping chamber, the elastic member being expandable in response to vacuum within the vacuum chamber;
means for connecting the vacuum to a source of vacuum;
check valve means associated with each of the inlet and outlet ends of the device to effect unidirectional flow therethrough; and vent means associated with the vacuum chamber to enable admission of atmospheric air into the vacuum chamber, thereby disrupting the expansion of the elastic member and enabling the resilience of the elastic member to contract and effect a pumping action on the material within the pumping chamber, said resilient contracting action of said elastic member providing the sole pumping force on the said material within the pumping member.
7. A device as defined in claim 6 further comprising:
said vent means being operable in response to the expansion of the elastic sleeve and closeable in response to contracting of the elastic sleeve.
said vent means being operable in response to the expansion of the elastic sleeve and closeable in response to contracting of the elastic sleeve.
8. A device as defined in claim 7 further comprising:
secondary manually operable vent means for selectively venting the chamber to the atmosphere.
secondary manually operable vent means for selectively venting the chamber to the atmosphere.
9. A device is defined in claim 8 wherein said secondary means comprises a manually, obstructable hole formed in the housing, independently of the first vent means.
10. A device as defined in claim 6 further comprising:
said vent means being manually operable.
said vent means being manually operable.
11. A device as defined in claim 10 wherein said vent means comprises an aperture formed in the housing to enable the chamber to be selectively vented to the atmosphere.
12, A pump as defined in claim 7 further comprising:
said elastic member being constructed so as to be expandable in a direction which extends transversely of the direction of fluid flow therethrough;
said vent means including actuating means mounted on the housing at a location so as to be engaged by the transversely expanding elastic member.
said elastic member being constructed so as to be expandable in a direction which extends transversely of the direction of fluid flow therethrough;
said vent means including actuating means mounted on the housing at a location so as to be engaged by the transversely expanding elastic member.
13. A pump as defined in claim 12 wherein the vent means further comprises:
valve means formed in the housing to communicate the vacuum chamber with the atmosphere;
said valve means including an actuating member located so as to be actuated in response to transverse movement of the elastic member.
valve means formed in the housing to communicate the vacuum chamber with the atmosphere;
said valve means including an actuating member located so as to be actuated in response to transverse movement of the elastic member.
14. A device as defined in claim 13 further comprising:
means biasing the vent valve in a normally closed configuration.
means biasing the vent valve in a normally closed configuration.
15. A device as defined in claim 6 further comprising:
the housing being elongate in configuration thereby to define an easily manipulable handle shape.
the housing being elongate in configuration thereby to define an easily manipulable handle shape.
16. A device as defined in claim 15 wherein the outlet end includes a tubular connector to enable various nozzle configurations to be detachably connected.
17. A device as defined in claim 6 wherein the housing includes at least a portion which is transparent thereby to enable the action of the resilient element to be observed.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US29772881A | 1981-08-31 | 1981-08-31 | |
| US297,728 | 1981-08-31 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1199525A true CA1199525A (en) | 1986-01-21 |
Family
ID=23147505
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000410447A Expired CA1199525A (en) | 1981-08-31 | 1982-08-30 | Vacuum driven pulsatile pump |
Country Status (12)
| Country | Link |
|---|---|
| JP (1) | JPS5874882A (en) |
| AU (1) | AU554244B2 (en) |
| BR (1) | BR8204814A (en) |
| CA (1) | CA1199525A (en) |
| DE (1) | DE3229253A1 (en) |
| ES (1) | ES8308003A1 (en) |
| FR (1) | FR2512124B1 (en) |
| GB (1) | GB2108211B (en) |
| IT (1) | IT1155205B (en) |
| MX (1) | MX157576A (en) |
| NL (1) | NL8203188A (en) |
| SE (1) | SE456441B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3443768A1 (en) * | 1984-06-13 | 1985-12-19 | Feluwa Schlesiger & Co KG, 5531 Mürlenbach | HOSE PISTON PUMP |
| JPS62254767A (en) * | 1986-04-28 | 1987-11-06 | 川澄化学工業株式会社 | Pulsating blood pump |
| GB2195149A (en) * | 1986-09-12 | 1988-03-30 | S B Services | Tubular diaphragm pumps |
| DE102010048751A1 (en) * | 2010-10-16 | 2012-04-19 | Jürgen Mahrwald | Method for liquid fertilization, involves positioning tubing housing perpendicularly on ground by user such that injection needle arranged at tubing housing determines overall fertilization of plant |
| CN103225599A (en) * | 2012-01-30 | 2013-07-31 | 青岛天力建筑加固工程有限公司 | Solar volumetric water-elevating device |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3526223A (en) * | 1965-09-20 | 1970-09-01 | Litton Systems Inc | Space suit and membrane pump system therefor |
| US3427987A (en) * | 1967-05-15 | 1969-02-18 | Gray Co Inc | Tubular diaphragm pump |
| US3635607A (en) * | 1970-04-20 | 1972-01-18 | Novelty Tool Co Inc | Vacuum pump |
| US3814547A (en) * | 1970-10-01 | 1974-06-04 | Tecna Corp | Nontraumatic heart pump |
| IT1117080B (en) * | 1977-09-21 | 1986-02-10 | Bosio Roberto | PUMP SUITABLE TO CREATE AN ARTIFICIAL BLOOD CIRCULATION |
-
1982
- 1982-07-22 AU AU86303/82A patent/AU554244B2/en not_active Ceased
- 1982-08-05 DE DE19823229253 patent/DE3229253A1/en not_active Withdrawn
- 1982-08-13 NL NL8203188A patent/NL8203188A/en not_active Application Discontinuation
- 1982-08-18 BR BR8204814A patent/BR8204814A/en unknown
- 1982-08-27 SE SE8204916A patent/SE456441B/en not_active IP Right Cessation
- 1982-08-27 GB GB08224615A patent/GB2108211B/en not_active Expired
- 1982-08-30 FR FR8214817A patent/FR2512124B1/en not_active Expired
- 1982-08-30 IT IT23047/82A patent/IT1155205B/en active
- 1982-08-30 MX MX194219A patent/MX157576A/en unknown
- 1982-08-30 ES ES515372A patent/ES8308003A1/en not_active Expired
- 1982-08-30 CA CA000410447A patent/CA1199525A/en not_active Expired
- 1982-08-31 JP JP57151649A patent/JPS5874882A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| AU554244B2 (en) | 1986-08-14 |
| SE8204916D0 (en) | 1982-08-27 |
| ES515372A0 (en) | 1983-08-01 |
| ES8308003A1 (en) | 1983-08-01 |
| GB2108211A (en) | 1983-05-11 |
| IT8223047A0 (en) | 1982-08-30 |
| AU8630382A (en) | 1983-03-10 |
| NL8203188A (en) | 1983-03-16 |
| MX157576A (en) | 1988-12-02 |
| GB2108211B (en) | 1985-07-10 |
| BR8204814A (en) | 1983-08-02 |
| IT1155205B (en) | 1987-01-21 |
| DE3229253A1 (en) | 1983-03-17 |
| SE8204916L (en) | 1983-03-01 |
| FR2512124A1 (en) | 1983-03-04 |
| SE456441B (en) | 1988-10-03 |
| JPS5874882A (en) | 1983-05-06 |
| FR2512124B1 (en) | 1988-11-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |