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WO1998042984A1 - Pompe volumetrique - Google Patents

Pompe volumetrique Download PDF

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Publication number
WO1998042984A1
WO1998042984A1 PCT/AU1998/000186 AU9800186W WO9842984A1 WO 1998042984 A1 WO1998042984 A1 WO 1998042984A1 AU 9800186 W AU9800186 W AU 9800186W WO 9842984 A1 WO9842984 A1 WO 9842984A1
Authority
WO
WIPO (PCT)
Prior art keywords
vane
peripheral surface
internal
arc
housing
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.)
Ceased
Application number
PCT/AU1998/000186
Other languages
English (en)
Inventor
Bernhard Nils Ostberg
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Baker Medical Research Institute
Original Assignee
Baker Medical Research Institute
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Baker Medical Research Institute filed Critical Baker Medical Research Institute
Priority to AU63856/98A priority Critical patent/AU6385698A/en
Publication of WO1998042984A1 publication Critical patent/WO1998042984A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
    • A61M60/10—Location thereof with respect to the patient's body
    • A61M60/122—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body
    • A61M60/126—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body implantable via, into, inside, in line, branching on, or around a blood vessel
    • A61M60/148—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body implantable via, into, inside, in line, branching on, or around a blood vessel in line with a blood vessel using resection or like techniques, e.g. permanent endovascular heart assist devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/30—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
    • F04C2/34—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members
    • F04C2/344—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member
    • F04C2/3441—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member the inner and outer member being in contact along one line or continuous surface substantially parallel to the axis of rotation
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
    • A61M60/10—Location thereof with respect to the patient's body
    • A61M60/104—Extracorporeal pumps, i.e. the blood being pumped outside the patient's body
    • A61M60/117—Extracorporeal pumps, i.e. the blood being pumped outside the patient's body for assisting the heart, e.g. transcutaneous or external ventricular assist devices
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
    • A61M60/10—Location thereof with respect to the patient's body
    • A61M60/122—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body
    • A61M60/165—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body implantable in, on, or around the heart
    • A61M60/178—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body implantable in, on, or around the heart drawing blood from a ventricle and returning the blood to the arterial system via a cannula external to the ventricle, e.g. left or right ventricular assist devices
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
    • A61M60/20—Type thereof
    • A61M60/247—Positive displacement blood pumps
    • A61M60/253—Positive displacement blood pumps including a displacement member directly acting on the blood
    • A61M60/268—Positive displacement blood pumps including a displacement member directly acting on the blood the displacement member being flexible, e.g. membranes, diaphragms or bladders
    • A61M60/279—Peristaltic pumps, e.g. roller pumps
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
    • A61M60/40—Details relating to driving
    • A61M60/424—Details relating to driving for positive displacement blood pumps
    • A61M60/457—Details relating to driving for positive displacement blood pumps the force acting on the blood contacting member being magnetic
    • A61M60/462—Electromagnetic force
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
    • A61M60/80—Constructional details other than related to driving
    • A61M60/835—Constructional details other than related to driving of positive displacement blood pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0042—Systems for the equilibration of forces acting on the machines or pump
    • F04C15/0049—Equalization of pressure pulses
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2250/00—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2250/0001—Means for transferring electromagnetic energy to implants

Definitions

  • a pump in accordance with the invention is particularly suitable for pumping liquids with entrained detritus or like matter, for example slurries, effluent or bilge water.
  • a pump in accordance with this invention is also particularly suitable for functioning as a ventricular assist device. It will be convenient to hereinafter describe the invention with reference to the example uses mentioned above, but it is to be appreciated that the invention is capable of broader application. BACKGROUND OF THE INVENTION
  • a known vane pump is made by providing a housing with a sinusoidal contour, one sine wave being performed by a point locus. As the point rotates, the centre around which the point executes its simple harmonic motion (SHM) is also the centre for a cylindrical rotor of the pump.
  • SHM simple harmonic motion
  • Such a pump has been described in my earlier Australian Patent Specification No. 423669 (43288/68), the entire disclosure of which is incorporated herein by reference.
  • the specification discloses a fluid displacing machine or pump having a rotor member and a stator member relatively rotatable about a common axis.
  • One of the members has a peripheral profile that is sinuous, opposed to which the other of the members has a peripheral profile that is circular.
  • the contour of the sinuous profile generates an odd number of evenly spaced chambers.
  • a feature of the sinuous profile is that the diametral distance between its opposite profile surfaces is constant.
  • At least one diametrally disposed vane is slidably mounted in the circular member and is adapted to sweep the sinuous profile of said one member on rotation of the circular member, there being inlet and outlet passages leading into and out of each chamber respectively, whereby upon relative rotation of the members pumping and/or compressing action is promoted.
  • a vane-type rotary fluid displacing device including an external member co-operating with an internal member, the members being relatively rotatable about a common axis, the external member having an internal peripheral surface and the internal member having an external peripheral surface, the surfaces being opposed, one of which peripheral surfaces has a sinuous profile additionally including first and second arcs, the other peripheral surface having a substantially circular profile, wherein said member having the substantially circular profile has at least one diametrically opposed vane slidably received therein; said first arc having a radius of curvature fractionally greater than a distance from the axis of rotation to said external pe ⁇ pheral surface of said internal member; said second arc having a radius of curvature larger than that of said first arc by the extent of the maximum excursion of said vane beyond said other peripheral surface; wherein said vane is adapted to continuously contact and sweep the peripheral surface of the other member, such that upon relative rotation of the members, the or each vane slides in the member having said other peripheral surface
  • a larger area of contact or close juxtaposition between the circular member and the housing contour is desirable because the greater the contact area, the less fluid is likely to escape past the contact area and the easier it is to seal the chambers from each other.
  • a larger area of contact can be achieved if two arcs, radial to the rotor centre are inserted into the housing contour. One arc has a radius fractionally larger than that of the rotor and the other arc has a radius larger than that of the said one arc by the extent of the maximum excursion of the vane beyond the rotor.
  • the radial arcs are connected to each other by two half sine waves.
  • n represents the number of sine waves the point P could perform in one rotation in the absence of the radial arcs.
  • the enlarged area of contact between the housing and rotor allows the pump to function with moderate separation between these surfaces.
  • a vane type rotary fluid displacing machine comprising an external member such as a housing cooperating with an internal member such as a rotor.
  • the members are relatively rotatable about a common axis, the external member having an internal peripheral surface and the internal member having an external peripheral surface, the surfaces being opposed.
  • One of the peripheral surfaces has a sinuous profile to which has been added two arcs each having a radius taken on the centre of the rotatable member, one arc having a fractionally longer radius than that of the rotatable member.
  • the opposite arc has a radius larger than that of said one arc by the extent of the maximum excursion of the vane beyond the rotor.
  • the other peripheral surface has a substantially circular profile having at least one diametrally opposed vane slidably mounted therein and adapted to continuously contact and sweep the pe ⁇ pheral surface profile of the other member to form chambers, so that upon relative rotation of the members the or each vane slides in the circular member as the vane follows the peripheral surface profile.
  • Inlet and outlet passages lead into and out of each chamber, whereby fluid is alternatively drawn into and discharged from the chambers by the sweeping action of the vane or vanes.
  • the external member may be movable relative to the internal member. Typically any such movement would be restricted to movement in a radial direction. This permits separation of the rotor from the housing when for example solid material is forced between the adjacent surfaces of the rotor and housing, without obstructing operation of the pump.
  • Relative movement of the external and internal members is particularly advantageous where the pump is used for pumping fluids containing debris or detritus, for example, pumping bilge, sewage, sludge etc.
  • the relative movement of the external and internal members is less important, and in some cases, undesirable, where the pump is being used as a ventricular assist device.
  • the fluid being pumped is blood, which does not normally contain detritus.
  • a moveable housing may result in leakage of fluids from one chamber to another.
  • resilient biasing means may be provided for returning the housing to its original position when the obstruction has been removed.
  • straps, springs or even the force of gravity may be used to bias the housing back to its original position.
  • the pump's housing is spring loaded to allow the passage of relatively coarse debris, such as up to 5mm, between the rotor and the housing, after which the housing is biased back to its original position. It is preferred that the rotor abuts or is adjacent to the peripheral surface profile of the housing along said one arc and that the inlet and outlet ports are placed respectively before and after said one arc.
  • rollers are placed at each end of the vane to reduce wear of the vane tips.
  • the present invention also provides a ventricular assist device including a pump as defined broadly above.
  • a ventricular assist device may incorporate any one or more of the optional features defined above.
  • the device may be used as a left ventricular assist device or for use in total cardio- pulmonary bypass.
  • the device may even be used as an artificial heart.
  • One embodiment of a ventricular assist device includes an integral housing and does not include means facilitating movement of the external member relative to the internal member or rollers at each end of the vane.
  • the inlet and outlet passages of a ventricular assist device project away from the housing substantially parallel to each other.
  • the ventricular assist device may be located external to the patient. This would typically occur where the device was only being used as a "bridge to transplantation" or in acute treatment for a failing heart.
  • the ventricular assist device may be implanted into a patient, for example in the thoracic cavity or abdomen. It is envisaged that an implanted device could be driven by an electro-mechanical actuation means which transfers energy transcutaneously via an inductance loop.
  • the present invention further provides a pump defined broadly above when used as a ventricular assist device.
  • a pump may include any one or more of the optional features defined above.
  • the materials from which the ventricular assist device is made are biocompatible and exhibit low wear.
  • the vane is preferably constructed from Teflon (TM) dispersed in acetal resin, the rotor from Teflon glass (ie polytetrafluoroethylene impregnated with 25% glass fibres), and the housing from polycarbonate.
  • Teflon glass is advantageous due to its very low water absorptive' properties, ie less than 0.01 ml/g/24 hr immersion. Teflon dispersed acetal resin and polycarbonate also have low water absorptive properties at 0.06 and 0.15 ml/g/24 hr immersion, respectively. The wear and thermal expansion properties of these materials are also beneficial. Acetal resin impregnated with 20% Teflon moving against polycarbonate (under standard conditions) results in a wear factor of 26 for the stator surface and 380 for the moving surface. The coefficients of expansion of Teflon glass, Teflon dispersed in acetal resin and polycarbonate are 10, 11 and 12 m/m/°C x 10 "5 , respectively.
  • the ventricular assist device may be driven in a continuous mode or a pulsatile mode.
  • the pump operates so as to simulate normal systolic and diastolic periods of a natural heart.
  • the invention also extends to a pump having a housing defining two chambers each of which has a rotor and vane arrangement associated therewith. It is preferred that the two rotors are driven by the same drive means via a single drive shaft. DESCRIPTION OF DRAWINGS
  • a pump according to the invention may take any one of a variety of forms. It will be convenient to hereinafter describe the invention in greater detail by reference to two particular embodiments thereof as shown in the accompanying drawings. The particularity of these drawings is not to be understood as superseding the generality of the preceding description.
  • Figure 1 is a schematic view of a curve made by a point P performing three simple harmonic motions while rotating in a complete circle about O.
  • Figure 2 is a schematic view of a pump in accordance with a first embodiment of the invention
  • Figure 3 is a perspective view of the pump of Figure 2 assembled
  • Figure 4 is a cross-sectional view of the pump of Figure 3 taken across its axis;
  • Figure 5 is a cross-sectional view of the pump of Figure 3 taken along its axis;
  • Figure 6 is a cross-sectional view through a pump in accordance with a second embodiment of the invention, taken across its axis;
  • Figure 7 is a perspective view of the pump of Figure 6;
  • Figure 8 is a cross-sectional view taken across the axis of a variation of the pump of Figure 6;
  • Figure 9 is a cross-sectional view taken along the axis of the pump of Figure 8.
  • the pump in accordance with the first embodiment shown in Figures 2 to 5 is described immediately below.
  • the pump 1 includes an external member which is a housing 2 within which an internal member which is a rotor 3 is received.
  • a vane 12 is located slidably within the rotor 3.
  • An inlet 4 directs fluid to be pumped into the housing 2 and an outlet 5 spaced from the inlet 4 on the housing 2, directs pumped fluid out of the housing 2.
  • Figure 2 shows the inlet 4 and outlet 5 projecting radially outwardly away from the housing 2.
  • the housing 2 is in the form of a flattened cylinder having two major surfaces 6 and 7 separated from each other by a substantially cylindrical wall 8.
  • the cylindrical wall 8 is slidably mounted between the major surfaces 6 and 7 by means of bolts 16.
  • each end surface 6 and 7 may have a cover mounted thereon which is removable from the remainder of the housing 2.
  • Each cover may have a poly-tetrafluoroethylene facing which abuts against the wall 8.
  • the housing 2 has an internal peripheral surface configured as a sinuous profile 9 to which has been added two arcs.
  • a first arc 10 has a radius taken on the centre of the rotor 3 and fractionally longer than the radius of the rotor 3.
  • the second arc 11 has a radius taken on the centre of the rotor 3 and longer than the first arc 10 by the extent of the full excursion of the vane beyond the rotor 3.
  • Each arc subtends an angle of about 90°C.
  • the two arcs 10, 11 are separated by half sine waves.
  • the length of the arcs 10, 11 is arranged to suit the application for which the pump 1 is intended.
  • the profile 9 is configured such that a fixed length vane 12 may be used, each end of which continuously contacts the housing profile as the vane 12 rotates.
  • the vane 12 has cylindrical rollers 13 at each end thereof to reduce wear thereof.
  • the housing 2 may include support means 15 for supporting the pump on or anchoring the pump to a support surface.
  • support means 15 may be in the form of an L-shaped bracket.
  • the pump may include means facilitating some limited movement of the housing 2 relative to the rotor 3 in a radial direction.
  • the pump may be adapted, via the arrangement of bolts 16 fastening the end covers to the wall 8, to permit movement of the wall 8 in the direction indicated by the arrow A ( Figure 2). That is, the housing 2 is able to move radially apart from the rotor 3 at the area of very close juxtaposition between the rotor 3 and the housing 2 (i.e. at arc 10). This movement may occur in the event of excessive pressure or during the entrapment of debris between the rotor 3 and housing 2. This feature results in the pump being able to pump fluids containing entrained foreign matter and the outlet 5 can be obstructed without, or with minimal, damage to the pump.
  • Resilient biasing means in the form of springs 17 may be provided to return the wall 8 of the housing 2 to its original position relative to the rotor 3. As shown in the drawings such springs 17 may be passed between two bolts 16 around the wall 8 so as to urge the wall 8 back to its original position. Each end of spring 17 is hooked onto the shaft of a bolt 16. Typically such displacement of the wall 8 away from the rotor 3 is caused in the first instance by excessive pressure, entrained detritus or the like.
  • the inlet 4 and outlet 5 are typically positioned on either side of the shorter arc 10 of the housing 2.
  • the rotor 3 is drivably coupled to a drive shaft 18 which in turn is coupled to a drive means (not shown) which may take any suitable form.
  • the shaft 18 is supported on bearings 19 which locate the rotor 3 within the housing 2.
  • the rotor 3 shown in Figure 2 is rotated in an anti-clockwise direction by the drive means. Obviously other rotors may be rotated in a clockwise direction.
  • the vane 12 sweeps the internal peripheral surface profile of the housing 2.
  • the vane 12 slides in the rotor 3 as opposed ends thereof maintain continuous contact with the internal profile 9 of the housing 2.
  • the vane 12 together with the rotor 3 and the internal profile 9 of the housing 2 define a plurality of chambers 20. Fluid is drawn into each chamber 20 through the inlet 4 and forced out through the outlet 5 by rotation of the rotor 3 and associated vane 12. In this manner a positive displacement type pumping action is effected.
  • FIG. 6 to 10 Two pumps in accordance with a second embodiment of the invention are shown in Figures 6 to 10. Unless otherwise indicated the same reference numerals in these drawings refer to the same components as in Figures 2 to 5. The structure and function of these pumps is very similar to that shown in Figures 2 to 5 and the following description focuses on the differences between the two embodiments.
  • the pumps shown in Figures 6 to 10 are designed for use as a ventricular assist device (VAD).
  • VAD ventricular assist device
  • the pumps are compact.
  • the housing 2 of each pump is of polycarbonate, the rotor 3 of teflon and fibreglass, and the vane 12 of teflon dispersed in acetyl resin. Naturally however other biologically acceptable materials may be used for these components.
  • the pumps are designed for use both as an external ventricular assist device and as an implantable and thus internal device.
  • the pump may act as a "bridge to transplantation" or in acute treatment for a failing heart.
  • the pump may act as a functional replacement for the left ventricle of the heart.
  • electro-mechanical actuation means may be used to achieve transcutaneous energy transfer, for example via an inductance loop.
  • the pumps shown in Figures 6 to 10 do not include means for facilitating movement of the housing 2 relative to the rotor 3. Further it is to be noted that the pump shown in Figures 9 and 10 does not have rollers 13 at each end of the vane 12.
  • the pumps illustrated in Figures 6 to 10 function in substantially the same way as the pump illustrated in Figures 2 to 5.
  • Figures 8a, b and c illustrate the principle of the pump's action.
  • FIG 8(a) (b) and (c) the pump 1 is illustrated with the rotor 3 and vane 12 rotating in a clockwise direction.
  • Figure 8(a) shows blood (indicated as shaded area) being drawn into the inlet 4 by the action of the vane 12.
  • the leading end 12a of the vane 12 passes the inlet 4, it creates a zone of low pressure in the chamber 20a which draws blood into chamber 20a.
  • the trailing end 12b ( Figure 8(b)) passes the inlet 4, thus sealing the blood in chamber 20a.
  • the blood filled chamber 20a is moved towards the outlet 5 with further rotation of the vane 12, and the blood is expelled through the outlet 5.
  • a modified pump having two pumping mechanisms driven by the same drive shaft could be used as a biventricular assist device.
  • the two pumping mechanisms could be adapted to have different stroke volumes by appropriate configuration of the respective surface profiles 9.
  • Naturally a biventricular assist device could function as a total artificial heart.
  • a pump of this design provides improved sealing between the rotor and the internal profile of the housing. This is achieved by the inclusion of arcs in the profile of the interior surface of the housing.
  • the arc with the smaller radius of curvature enables a relatively large area of contact between the rotor and the internal peripheral surface of the housing, which lessens the possibility of fluid leaking past the area of contact. This in turn improves the seal between chambers in the pump.
  • the configuration of the internal profile of the housing so as to provide a constant diametral length through the rotor centre allows fine clearances between the vane and the housing.
  • a pump of this design It is a further advantage of a pump of this design that the stroke volume can easily be changed to suit different applications. Further it has a relatively simple and compact design with few moving parts with the consequence that it is relatively inexpensive to make.
  • An advantage of providing a ventricular assist device which is a pump in accordance with this invention is that it eliminates the use of valves which are a weak point in existing ventricular assist devices. Further the compact design of the pump enables its implantation in either the thoracic cavity or abdomen of a patient. Further the device can be operated in continuous or pulsatile mode and the rotor could be magnetically coupled to the drive means. Further it is envisaged that the implanted pump may be driven transcutaneously by an external power source without having tubing or wires passing through the skin of a patient. Finally a ventricular assist device according to this invention would be substantially less expensive than known ventricular assist devices.

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  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Cardiology (AREA)
  • Mechanical Engineering (AREA)
  • Hematology (AREA)
  • Anesthesiology (AREA)
  • Biomedical Technology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Vascular Medicine (AREA)
  • External Artificial Organs (AREA)

Abstract

L'invention porte sur un dispositif rotatif à ailettes (1) de déplacement de fluide comprenant un élément extérieur (2) coopérant avec un élément intérieur (3), ces éléments pouvant relativement tourner autour d'un axe commun. L'élément extérieur (2) comporte une surface périphérique interne et l'élément intérieur (3) une surface périphérique externe, ces surfaces étant opposées et l'une d'elles ayant un profil courbe (9) comprenant de plus des premier et second arcs (10, 11), l'autre surface périphérique ayant un profil sensiblement circulaire. Cet élément au profil sensiblement circulaire comporte au moins une ailette (12) diamétralement opposée qui est introduite par coulissement. Le premier arc (10) a un rayon de courbure supérieur de manière fractionnaire à une distance comprise entre l'axe de rotation et la surface périphérique externe de l'élément intérieur. Le second arc (11) a un rayon de courbure supérieur à celui du premier (10) en raison de l'extension de l'excursion maximale de l'ailette (12) dépassant l'autre surface périphérique. L'ailette (12) est adaptée pour être continuellement en contact avec la surface périphérique de l'autre élément et la balayer de sorte que, lors de la rotation relative des éléments, cette ailette (12) ou chaque ailette coulisse dans l'élément à la surface périphérique différente au moment où elle balaye cette surface périphérique. L'ailette ou chaque ailette associée à ces surfaces périphériques forme une pluralité de chambres (20), un orifice d'admission (4) étant ménagé dans une chambre et un orifice d'évacuation (5) dans une autre chambre. En utilisation, le fluide peut être entraîné dans une chambre (20) par l'orifice d'admission (4) et évacué de l'autre chambre par l'orifice d'évacuation (5) sous l'action de balayage de l'ailette ou de chaque ailette.
PCT/AU1998/000186 1997-03-24 1998-03-23 Pompe volumetrique Ceased WO1998042984A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU63856/98A AU6385698A (en) 1997-03-24 1998-03-23 Positive displacement pump

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPO5803A AUPO580397A0 (en) 1997-03-24 1997-03-24 Positive displacement pump
AUPO5803 1997-03-24

Publications (1)

Publication Number Publication Date
WO1998042984A1 true WO1998042984A1 (fr) 1998-10-01

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Family Applications (1)

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PCT/AU1998/000186 Ceased WO1998042984A1 (fr) 1997-03-24 1998-03-23 Pompe volumetrique

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AU (1) AUPO580397A0 (fr)
WO (1) WO1998042984A1 (fr)

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000035514A1 (fr) * 1998-12-15 2000-06-22 Bjoerk Gunnar Anders Ensemble de pompe
EP1454755A1 (fr) * 2003-03-05 2004-09-08 Brother Kogyo Kabushiki Kaisha Pompe et imprimante à jet d'encre
EP1518693A1 (fr) * 2003-09-25 2005-03-30 Brother Kogyo Kabushiki Kaisha Appareil d'enregistrement à jet d'encre avec pompe, méthode de commande d'un appareil d'enregistrement à jet d'encre et méthode de commande de la pompe
EP1527885A1 (fr) * 2003-10-31 2005-05-04 Brother Kogyo Kabushiki Kaisha Imprimante à jet d'encre et méthode de commande pour celle-ci
WO2009127281A1 (fr) * 2008-04-17 2009-10-22 FRÖTEK Kunststofftechnik GmbH Palette d'une pompe à palettes ou d'un compresseur à palettes
WO2011131766A1 (fr) * 2010-04-23 2011-10-27 Deutsches Zentrum für Luft- und Raumfahrt e.V. Dispositif d'assistance cardiaque
DE102010026034A1 (de) * 2010-07-03 2012-01-05 Mahle International Gmbh Drehschieberpumpe
CN103671097A (zh) * 2013-12-16 2014-03-26 浙江大学 一种叶片泵
DE202014100123U1 (de) * 2014-01-13 2015-04-14 Krones Ag Drehschieberpumpe zum Fördern von Leim
DE102006013983B4 (de) * 2006-03-22 2017-06-08 Talip Tevkür Herzunterstützungssystem oder künstliches Herz
US10722631B2 (en) 2018-02-01 2020-07-28 Shifamed Holdings, Llc Intravascular blood pumps and methods of use and manufacture
US11185677B2 (en) 2017-06-07 2021-11-30 Shifamed Holdings, Llc Intravascular fluid movement devices, systems, and methods of use
US11511103B2 (en) 2017-11-13 2022-11-29 Shifamed Holdings, Llc Intravascular fluid movement devices, systems, and methods of use
US11654275B2 (en) 2019-07-22 2023-05-23 Shifamed Holdings, Llc Intravascular blood pumps with struts and methods of use and manufacture
US11724089B2 (en) 2019-09-25 2023-08-15 Shifamed Holdings, Llc Intravascular blood pump systems and methods of use and control thereof
US11964145B2 (en) 2019-07-12 2024-04-23 Shifamed Holdings, Llc Intravascular blood pumps and methods of manufacture and use
US12102815B2 (en) 2019-09-25 2024-10-01 Shifamed Holdings, Llc Catheter blood pumps and collapsible pump housings
US12121713B2 (en) 2019-09-25 2024-10-22 Shifamed Holdings, Llc Catheter blood pumps and collapsible blood conduits
US12161857B2 (en) 2018-07-31 2024-12-10 Shifamed Holdings, Llc Intravascular blood pumps and methods of use
US12220570B2 (en) 2018-10-05 2025-02-11 Shifamed Holdings, Llc Intravascular blood pumps and methods of use
US12409310B2 (en) 2019-12-11 2025-09-09 Shifamed Holdings, Llc Descending aorta and vena cava blood pumps
US12465748B2 (en) 2019-08-07 2025-11-11 Supira Medical, Inc. Catheter blood pumps and collapsible pump housings

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Publication number Priority date Publication date Assignee Title
AU4328868A (en) * 1968-09-12 1971-03-04 Nils Ostberg Bernhard Improved vane-type rotary fluid displacing machine
US4712987A (en) * 1985-05-22 1987-12-15 Diesel Kiki Co., Ltd. Vane compressor provided with endless camming surface minimizing torque fluctuations
EP0333391A2 (fr) * 1988-03-16 1989-09-20 J. S. Maskinfabrik A/S Pompe à palettes
DE3812794A1 (de) * 1988-04-16 1989-10-26 Martin Haemmerle Rotationspumpe
WO1994005912A1 (fr) * 1992-09-02 1994-03-17 Bernt Lorentz Machine a cellules semi-rotative

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU4328868A (en) * 1968-09-12 1971-03-04 Nils Ostberg Bernhard Improved vane-type rotary fluid displacing machine
US4712987A (en) * 1985-05-22 1987-12-15 Diesel Kiki Co., Ltd. Vane compressor provided with endless camming surface minimizing torque fluctuations
EP0333391A2 (fr) * 1988-03-16 1989-09-20 J. S. Maskinfabrik A/S Pompe à palettes
DE3812794A1 (de) * 1988-04-16 1989-10-26 Martin Haemmerle Rotationspumpe
WO1994005912A1 (fr) * 1992-09-02 1994-03-17 Bernt Lorentz Machine a cellules semi-rotative

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Title
DERWENT ABSTRACT, Accession No. 96-320224/32, Class Q56; & JP,A,08 144 975, 4 June 1996. *

Cited By (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000035514A1 (fr) * 1998-12-15 2000-06-22 Bjoerk Gunnar Anders Ensemble de pompe
EP1454755A1 (fr) * 2003-03-05 2004-09-08 Brother Kogyo Kabushiki Kaisha Pompe et imprimante à jet d'encre
US7588432B2 (en) 2003-03-05 2009-09-15 Brother Kogyo Kabushiki Kaisha Pump and inkjet printer
EP1518693A1 (fr) * 2003-09-25 2005-03-30 Brother Kogyo Kabushiki Kaisha Appareil d'enregistrement à jet d'encre avec pompe, méthode de commande d'un appareil d'enregistrement à jet d'encre et méthode de commande de la pompe
US7322682B2 (en) 2003-09-25 2008-01-29 Brother Kogyo Kabushiki Kaisha Ink-jet recording apparatus including pump, method for controlling the ink-jet recording apparatus and method for controlling the pump
US7628479B2 (en) 2003-09-25 2009-12-08 Brother Kogyo Kabushiki Kaisha Ink-jet recording apparatus including pump, method for controlling the ink-jet recording apparatus, and method for controlling the pump
EP1527885A1 (fr) * 2003-10-31 2005-05-04 Brother Kogyo Kabushiki Kaisha Imprimante à jet d'encre et méthode de commande pour celle-ci
US7360878B2 (en) 2003-10-31 2008-04-22 Brother Kogyo Kabushiki Kaisha Inkjet printer and method of controlling the inkjet printer
US7393090B2 (en) 2003-10-31 2008-07-01 Brother Kogyo Kabushiki Kaisha Inkjet printer and method of controlling the inkjet printer
DE102006013983B4 (de) * 2006-03-22 2017-06-08 Talip Tevkür Herzunterstützungssystem oder künstliches Herz
WO2009127281A1 (fr) * 2008-04-17 2009-10-22 FRÖTEK Kunststofftechnik GmbH Palette d'une pompe à palettes ou d'un compresseur à palettes
US9295767B2 (en) 2010-04-23 2016-03-29 Deutsches Zentrum Fuer Luft-Und Raumfahrt E.V. Heart assistance device
WO2011131766A1 (fr) * 2010-04-23 2011-10-27 Deutsches Zentrum für Luft- und Raumfahrt e.V. Dispositif d'assistance cardiaque
DE102010026034A1 (de) * 2010-07-03 2012-01-05 Mahle International Gmbh Drehschieberpumpe
CN103671097A (zh) * 2013-12-16 2014-03-26 浙江大学 一种叶片泵
DE202014100123U1 (de) * 2014-01-13 2015-04-14 Krones Ag Drehschieberpumpe zum Fördern von Leim
US11185677B2 (en) 2017-06-07 2021-11-30 Shifamed Holdings, Llc Intravascular fluid movement devices, systems, and methods of use
US11717670B2 (en) 2017-06-07 2023-08-08 Shifamed Holdings, LLP Intravascular fluid movement devices, systems, and methods of use
US11511103B2 (en) 2017-11-13 2022-11-29 Shifamed Holdings, Llc Intravascular fluid movement devices, systems, and methods of use
US12076545B2 (en) 2018-02-01 2024-09-03 Shifamed Holdings, Llc Intravascular blood pumps and methods of use and manufacture
US11229784B2 (en) 2018-02-01 2022-01-25 Shifamed Holdings, Llc Intravascular blood pumps and methods of use and manufacture
US10722631B2 (en) 2018-02-01 2020-07-28 Shifamed Holdings, Llc Intravascular blood pumps and methods of use and manufacture
US12161857B2 (en) 2018-07-31 2024-12-10 Shifamed Holdings, Llc Intravascular blood pumps and methods of use
US12220570B2 (en) 2018-10-05 2025-02-11 Shifamed Holdings, Llc Intravascular blood pumps and methods of use
US11964145B2 (en) 2019-07-12 2024-04-23 Shifamed Holdings, Llc Intravascular blood pumps and methods of manufacture and use
US11654275B2 (en) 2019-07-22 2023-05-23 Shifamed Holdings, Llc Intravascular blood pumps with struts and methods of use and manufacture
US12465748B2 (en) 2019-08-07 2025-11-11 Supira Medical, Inc. Catheter blood pumps and collapsible pump housings
US11724089B2 (en) 2019-09-25 2023-08-15 Shifamed Holdings, Llc Intravascular blood pump systems and methods of use and control thereof
US12102815B2 (en) 2019-09-25 2024-10-01 Shifamed Holdings, Llc Catheter blood pumps and collapsible pump housings
US12121713B2 (en) 2019-09-25 2024-10-22 Shifamed Holdings, Llc Catheter blood pumps and collapsible blood conduits
US12409310B2 (en) 2019-12-11 2025-09-09 Shifamed Holdings, Llc Descending aorta and vena cava blood pumps

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