FR2512124A1 - PUMP PULSATIONS DRAINED BY THE VACUUM - Google Patents

Abstract

A. PERISTALTIC PULSATION PUMP INCLUDING AN ELASTIC HOLLOW BODY 16 WITH AN INPUT 12 AND AN OUTPUT 14 DEFINING A FLOW PASSAGE BETWEEN ITS ENDS. B. CHARACTERIZED IN THAT IT INCLUDES A CHAMBER WITH VARIABLE PRESSURE, THE ELASTIC HOLLOW ORGAN BEING ENCLOSED IN THIS CHAMBER AND TIGHTLY CLOSED IN RELATION TO IT, MEANS TO CREATE OSCILLATORY VARIATIONS IN THE PRESSURE IN THIS CHAMBER 32 AND VALVES STOP 20, 22 FOR THE REALIZATION OF A UNIDIRECTIONAL FLUID FLOW IN THE BODY. C. DEVICE USED FOR MEDICAL AND SURGICAL PURPOSES.

Description

"Pump pulsations driven by the vacuum".

  the present invention relates to

  Fluid pumps for use at relatively low pressure levels, and particularly, pumps which can be operated by connection to a vacuum source. The invention is applicable particularly, but not exclusively, in medical environments, such as operating rooms, in which a source of

  Empty is directly available at all times.

  In medical circles and halls

  operations, low flow pumps, which are action-

  in a pulsating or peristaltic way, have a wide variety of jobs. For example, they may

  be used to extract fluid from open wounds.

  and deliver these liquids to a collecting receptacle.

  They can be used as stomach pumps, or

  to collect blood and / or to perform a transfusion

  donor to receptor Pulsating, low-pressure pumps can also be used in kidney dialysis techniques to transfer blood to

  machine dialysis, or from it to the patient.

  Low flow pumps with a pulsating, peristaltic operating mode can also be used in connection with wound or organ irrigation and

d 6 wound clamping.

  In accordance with the present invention, a simple and yet effective device is provided, which comprises an expandable elastic member, preferably sleeve-shaped having an inlet end and a

  outlet end the sleeve is contained within the

  and extends through a relative vacuum chamber

  rigid element that can be connected to a vacuum source.

  The vacuum chamber surrounds the elastic sleeve such that, when the vacuum is applied to the chamber, the sleeve expands. A stop valve is disposed.

  at each of the input and output ends for

  that the flow through the sleeve is unidirectional

  When the vacuum is applied, the pressure reduces

  surrounding you the elastic sleeve causes an expansion of it so that fluid is drawn through

  the inlet, through the open stop valve.

  In a device with automatic operation

  In accordance with the invention, expansion and ingestion of fluid in the elastic sleeve continues until the sleeve has expanded to a predetermined size at which time the expansion of the sleeve tilts.

  a valve that connects the vacuum chamber to the atmosphere.

  When the chamber fills with air, the elastic sleeve contracts by closing the inlet stop valve and the fluid contained in the sleeve is expelled through the

  outlet stop valve in the receiving line.

  The elastic contraction of the sleeve closes, or allows the

  closing of the vent valve to allow suction

  beginning a new pumping cycle.

  The invention also provides for

  manually operable controls by which the frequency and extent of the action can be controlled

pumping.

  The present invention aims to achieve

  a pump that develops a pulsating action, perishes

taltic, commanded by emptiness.

  This pump with a weighted pumping action

  suitable for use in medical and surgical environments.

  in which the delicacy of the action of pom-

  page is a major consideration.

  The invention provides pumping devices of the type described which are operable both

automatically and manually.

  the pump of the invention must be simple, of inexpensive construction and lend itself directly

to work.

  For this purpose, the subject of the invention is a pump of the pulsating and peristaltic type, characterized in that it comprises a variable pressure chamber,

  the hollow elastic organ being enclosed in this chamber

  hermetically sealed against it, means for creating oscillatory pressure variations in this chamber and shut-off valves

  for producing a unidirectional fluid flow

in said organ.

  the following description refers to

  Embodiments of the invention with reference to the accompanying drawings, in which: Figure 1 is a schematic view

cut off from the pump.

  FIG. 2 is a sectional longitudinal view

  tudinal, showing the way in which the element

  elastic stretches to absorb fluid.

  FIG. 3 is a view similar to FIG. 3 showing the device when it is connected to the atmosphere to perform a pumping action

  pulsating on the elastic element.

  Figure 4 shows a variant of the device of Figures 1 to 3 wherein the automatic expansion action can be supplemented by a manual action. FIG. 5 is an actionable view

  completely manually from a pump in accordance with the

  vention. FIG. 1 is a schematic view of the functional elements of an embodiment of the invention with automatic operation. The device comprises a rigid casing 10 which can be molded from plastic or the like.

  variety of forms depending in part on the envi-

  the particular nature of the employment and the

  For example, the casing alone may be in the form of a traditional elongate device to be held by hand, or the form of a casing which can

  connect various conductors, hoses or fittings.

  In the example shown, the housing 10 has an inlet end 12 and an outlet end 14. An elastic sleeve 16 extends through the housing 10 from the inlet end 12 to the outlet end 14. ends of the elastic sleeve 16 are hermetically assembled at the inlet and outlet ends of the housing, for example by means of folded edges

represented 18.

  A stop valve 20, 22 is associated

  at each input and output end of the device.

  the inlet valve 20 is designed to allow the 6

  only from inlet 12 into the elastic sleeve

  16 and the outlet valve 22 to allow the flow of

  from the sleeve to the outlet 14 the shut-off valves

  , 22 may be of conventional construction

  the use of the device. For example, they may

  ball valves, mounted in a

  tubular string 24 and 26 defining the inlet and the outlet.

  The housing is provided with a connection which can be connected to a vacuum line, which, at its

  turn, can be connected to a vacuum source, traditional

  In the operating or hospital or surgical rooms, the vacuum line is preferably provided with a restriction valve (not shown) to cut or restrict the degree of

  from vacuum to the vacuum chamber of the device.

  From the foregoing, the interior of the housing 10 may be considered as defining a variable volume pumping chamber (defined by the

  internal volume of the elastic sleeve 16) and a chamber

  annular vacuum pump 32 surrounding the sleeve

  When a vacuum is established in the vacuum chamber 32, the elastic sleeve expands, sucking fluid into the pump chamber 30 through the inlet tube and the shut-off valve 20. operating phase, the outlet stop valve 22

remains closed.

  the volume that will be ingested and pumped by the pumping chamber 30 is a direct function of the extension allowed for the sleeve 16 For this purpose, the device comprises an expansion valve 34 which is mounted in the housing 10 so as to be displaced by the sleeve 16 which expands transversely when the

  pumping chamber 32 has reached a predetermined volume.

  In the example shown, the expansion valve 34 is mounted in the chamber housing 10 and extends through a vent opening 36 formed in the housing. The valve 34 includes a shutter member 38 which is shown as This member 38 cooperates with a valve seat 40 that surrounds the vent port 16, and it normally applies to the seat to maintain the valve opening 36 closed as

shown in Figures 1 and 2.

  Valve assembly 34 also includes

  A valve stem 42 extends inwardly from the valve member 38 through the opening 36. The inner end of the valve stem 42 terminates with a valve plug 44 which can be engaged. by the elastic sleeve 16 in its transverse expansion Ca valve can be urged in its position

  closed seat on the valve seat 40, by a res-

  additional lot or analogous body, shown in

  by way of example by a leaf spring 46.

  From what precedes, we see that, when

  that the elastic pumping chamber 30 has dilated

  than at a predetermined size, it engages with the

  valve plug 44, so that an additional expansion

  the sleeve pushes valve 44 towards its opening.

  ture and allows atmospheric air to penetrate through

  to the valve opening 36 The degree of vacuum and the size of the valve opening 36 can be chosen such that the rate of air admission through the valve opening 36 will be sufficiently greater than the speed of air through the vacuum line to allow the sleeve to return to its reduced volume in a predetermined time interval. Thus, by adjusting these parameters, the characteristics of the pulsating pumping action, such as the frequency,

can be varied.

  When the valve opens, the elastic nature of the sleeve has the effect that it contracts, thus displacing the fluid contained in the elasti chamber

  than pumping out and out, through the

  output stop popse 22 and in the outlet pipe 14

  After the elastic pumping chamber has become

  towed to such an extent that the relief valve

  34 can close, the cycle is repeated again.

  From what precedes, we see that the

  device can be used either as a suction device

  either as a fluid delivery device or for these combined actions. It can be used to

  aspiration of a closed wound, for example cavity

  abdominal tee, in which the inlet 24 can be

  connected to a traditional closed wound drainage tube, the degree of vacuum in the vacuum line and the

  evacuation rate of the chamber being adjusted to ensure

  the desired suction and pumping effect

  the device could be used as a stomach pump for cautious pumping but

  serious matter present in the stomach of a patient.

  As an output delivery device, the tube of

  can be inserted into a sterile solution of irri-

  tion and debridement and the output end be connected to a tube which, in turn, is provided with a

  appropriate nozzle or shower element at its other end

  moth. The fluid pumping action is particularly suitable for situations in which it is important to exert a precautionary action and / or forced jets at high speed and high frequency are undesirable, such as, for example, when the surface of delicate organs or delicate wounds must be

  From this point of view, it should be noted that the pres-

  pumping stations used in the present invention

  can be relatively low and particularly well

  This results from the ability of the device to be operated at a pressure between a low pressure equal to the maximum available vacuum and atmospheric pressure. During operation of the device, the vacuum inside the vacuum chamber may vary between atmospheric pressure and a desired selected vacuum level; FIG. 4 shows an alternative embodiment of the device in the form of an opening formed in the housing 10 at a suitable location where it can be covered or uncovered with the finger

  of the user This opening 50 in the crankcase

  puts the user in a proper control of the test pattern and stops the device can be rendered inactive by discovering the opening 50, which puts into permanent unication chamber 32 with the atmosphere If one

  wants to restore the functioning of the device, it suffices

  simply made to cover the opening 50 with the finger so that the vacuum develops in the chamber 32

  addition to providing an on-off command mode, the

  can be selectively blocked and unlocked to vary the operating frequency of the

  automatic valve by varying the degree to which the

  In addition, the opening can be covered and discovered at a faster rate.

  faster than the normal operating frequency

  the device, which allows a mode of operation

completely manual.

  In some cases, it is better to

  to realize a device simply operable manually

  FIG. 5 shows such a device in which

  the automatic valve system is completely sup-

  award-winning and instead presents an opening

  simply controllable by hand The frequency is complete

  controlled by the user by opening and closing the opening 50, to a degree and with a frequency

  that suit the needs of the moment.

  The various embodiments of the invention are of relatively simple construction and can be

  used as a disposable appliance.

  Various modifications of detail may be made without departing from the field of protection of inventions

Claims (6)

CLAIMS) A peristaltic pulsation pump comprising an elastic hollow member (16) with an inlet (12) and an outlet (14) defining a flow passage between its ends, characterized in that it comprises a variable pressure chamber, the hollow elastic member being enclosed in this chamber and hermetically closed with respect to it, means for creating oscillatory variations of the pressure in this chamber (32) and stop valves (20, 22) for performing a unidirectional fluid flow in said member. Pump according to claim 1, characterized in that it further comprises means (34) for varying the pressure inside the chamber (32) to a limit not exceeding one atmosphere. Pump according to Claim 1, characterized in that the means for creating the oscillatory pressure are designed and constructed for automatic operation. Pump according to claim 1, characterized in that the means for creating the pressure variations comprise manually operable members. Pump according to claim 1, characterized in that it comprises a casing (10) defining a vacuum chamber and provided with an inlet (12) and an outlet (14), an elastic member (16) extending from the inlet to the outlet of the chamber and separating the chamber into a pumping chamber (30) and a vacuum chamber (32) surrounding the latter, and connected to a vacuum source, stopping (20 and 22) respectively associated with the input end and the output end to cause a unidirectional flow in the elastic member (16), vent means (34) associated with the chamber (32). ) to allow the admission of atmospheric air, thereby suppressing the expansion of the elastic member (16) and allowing its elasticity to perform a pumping action on the fluid contained in the organ.   6) Pump according to claim 5, characterized in that the vent means (34) are   actuated in response to the expansion of the elastic sleeve   than (16) and close in response to contraction of the sleeve. 7) Pump according to claim 6,   characterized in that it further comprises an opening   manually operated secondary vent port for   connect the vacuum chamber (32) to the atmosphere at will.   8) Pump according to claim 7, characterized in that the secondary vent is constituted   by a closable bore (50) provided in the housing,   depending on the first automatic opening.   9) Pump according to claim 8, characterized in that the secondary vent hole is manually operable.    Pump according to Claim 9, characterized in that the vent bore formed in the casing makes it possible to connect the vacuum chamber (32) as desired. to the atmosphere.   11) Pump according to claim 6,   characterized in that the elastic member (16) is constructed   staged to undergo extension in a trans-   versal to the flow direction of the fluid within the   the vent means are mounted on the housing at a location which is not engaged by the displacement.   transverse expansion of the elastic member.   12) Pump according to claim 11, characterized in that the vent means comprise   a valve, formed in the housing to communicate   to open the vacuum chamber with the atmosphere, and to   an actuator (42) responds to the movement transverse of the elastic member.   According to claim 5, characterized in that the means for biasing the shut-off valve (34) to its shut-off position is as shown in claim 5,   characterized by a casing shape allon: gée easily.   m1n-Dulable at 1 m-n) Pylon according to claim 14,   in this case the exit exem- plity is   11 th, in black difîe difîe, 'ren: The removable injectors.