WO2000037126A1 - Pulsatile pumpe - Google Patents
Pulsatile pumpe Download PDFInfo
- Publication number
- WO2000037126A1 WO2000037126A1 PCT/EP1999/010102 EP9910102W WO0037126A1 WO 2000037126 A1 WO2000037126 A1 WO 2000037126A1 EP 9910102 W EP9910102 W EP 9910102W WO 0037126 A1 WO0037126 A1 WO 0037126A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- actuator
- stator
- pump according
- pulsatile pump
- guide
- Prior art date
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
- F04B43/02—Machines, pumps, or pumping installations having flexible working members having plate-like flexible members, e.g. diaphragms
- F04B43/04—Pumps having electric drive
-
- 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
-
- 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
- A61M60/50—Details relating to control
- A61M60/508—Electronic control means, e.g. for feedback regulation
- A61M60/562—Electronic control means, e.g. for feedback regulation for making blood flow pulsatile in blood pumps that do not intrinsically create pulsatile flow
-
- 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
- A61M60/837—Aspects of flexible displacement members, e.g. shapes or materials
-
- 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
Definitions
- the invention relates to a pulsatile pump according to the preamble of claim 1 and a blood pump to support or replace the human or animal heart.
- an electromagnetic drive for a blood pump in which two core halves which can be moved relative to one another form an iron circle together with exciting coils.
- One core half is fixed to the housing of the blood pump, while the other core half can be moved back and forth between an ejection position and a suction position depending on the magnetic excitation.
- a blood chamber of the blood pump In the ejection position, a blood chamber of the blood pump is compressed and the blood is pressed out through outlet valves.
- the magnetic properties of the drive are improved, so that the size can be reduced.
- US-A-5, 599, 173 describes a blood pump with a deformable blood chamber which faces a pair. has substantially flat, circular walls. The walls are compressed by a pair of solenoid actuator pressure plates to empty the blood chamber.
- the invention has for its object to provide drives for a pump and pumps available, which are characterized by a small size, in particular a low height, do not show their own movement during operation and have a low mass.
- the solution according to the invention then provides for a reduction in the size of the drive system, in that the stator and actuator of the drive are designed in such a way that they interlock in one or the other of the two possible end positions (engagement position) and thereby achieve a small overall height.
- the overall height of the interlocking parts is less than the sum of the overall heights of the stator and actuator.
- stator and the actuator together in the engagement position form a height which only slightly exceeds the height of the stator. This almost halves the height of the drive or a pump provided with the drive compared to known drives.
- Both the stator and the actuator advantageously have circumferential magnetic core elements which are essentially U-shaped in cross section and which engage in one another in the engagement position.
- a cross-sectionally U-shaped configuration of the magnetic core elements enables the core elements to interlock with a simple geometry.
- An annular magnetic coil which serves to magnetically excite a magnetic circuit formed by the stator and actuator, is preferably arranged in the recess of the stator which is U-shaped in cross section. This provides a compact geometry.
- the invention relates in particular to electromagnetic drives.
- it is not limited to such drives, but includes all drives for pumps that are provided with a stator and a movable actuator.
- the actuator can also be driven electromechanically, electro-hydraulically or electro-pneumatically.
- the drive according to the invention preferably has means which exert a force on the actuator in the engagement position in the direction of the other position.
- These are, in particular, spring means which separate the actuator from the stator after the magnetic excitation has ceased and press against the fluid chamber in order to press out the fluid to be transported.
- the actuator preferably forms an essentially flat pressure plate on its side facing the fluid chamber so that the fluid chamber is compressed uniformly.
- the fluid chamber is formed by membranes, which are not attached to the pressure plate of the actuator.
- the pressure plate has pressure compensation openings that compensate for negative and excess pressures that arise during the pumping process and prevent the membrane from sticking.
- the surface of the pressure plate also prevents the membrane from sticking.
- the actuator and stator only touch each other on the contact surfaces in the engagement position, so that no canting or jamming of the parts, friction losses, material wear, noise pollution etc. occur.
- the stator-actuator combination has a guide on which the actuator is mounted and by means of which the actuator can be moved back and forth relative to the stator.
- the guidance of the actuator causes a defined move back and forth between the two end positions, so that the actuator and stator can both be made very flat, since a tilting and tilting of the actuator and stator that is easily possible due to the flat design is excluded or reduced by the guide.
- the guide is advantageously arranged centrally so that there is a symmetrical structure and tilting can be prevented or reduced with only one guide.
- the guide has a longitudinal guide, in particular a central guide pin of the drive, on which the actuator is mounted so as to be longitudinally displaceable.
- the guide is designed as a leaf guide using suitable leaf spring arrangements. This eliminates the need for a central guide part, so that the compactness of the drive is further improved.
- Leaf spring arrangements also have a centering effect, i.e. a non-centric force acting on the actuator experiences a counterforce in the direction of a central arrangement, so that the desired alignment with respect to the stator is set.
- the guide is designed as a linear guide that has only one degree of freedom in the axial direction.
- it is necessary to design the drive and guide elements very precisely. This is complex and expensive often not possible with the required accuracy.
- the guide is therefore alternatively designed as a wobble guide.
- This solution deliberately allows the possibility of the actuator tipping slightly. This tilting does not hinder the functioning of the drive, since the meshing of the stator and actuator according to the invention in the engagement position produces a defined position of the elements in the engagement position.
- a wobble guide can be implemented, for example, via a leaf spring arrangement or via a wobble bearing connected to a central guide pin.
- the actuator and stator are preferably of rotationally symmetrical design, which also contributes to a " simple and compact construction of the drive.
- a blood pump according to the invention preferably has an essentially flat housing which surrounds the drive and the pump chamber and which has suction and outflow openings for the fluid to be transported, which are connected to the pump chamber.
- the stator is fixed in place on the housing, while the actuator is movable relative to the stator and the housing.
- a pump according to the invention can have one or more electromagnetic stator / actuator combinations.
- the use of two electromagnetic drives is advantageously provided, which are arranged symmetrically opposite one another in the pump housing are.
- the fluid chamber is arranged between the respective actuators and is compressed by the actuators from two sides.
- the advantage of a symmetrical system with two symmetrically arranged drives is that, in comparison to a single-soap system, only a small impulse is emitted during the pumping process into the human or animal body in which the pump is implanted.
- the use of two stator-actuator combinations provides a redundant system that is still functional even if one combination fails.
- the pump according to the invention is not limited to the use of two drives. A higher number of drives, for example four drives, can also be provided.
- the pump according to the invention with an extremely flat drive is preferably approximately the size of a hand, so that it can be implanted relatively easily to a person to be treated. It is used in particular as a blood pump to support or replace the human heart.
- Fig. La is a schematic representation of a pump with the actuator tightened
- Fig. Lb is a schematic representation of a pump with the actuator pushed away; 2 shows a schematic illustration of a pump with a filled fluid chamber;
- 2b shows a schematic illustration of a pump with an empty fluid chamber
- Fig. 3 is a schematic representation of a double leaf spring
- FIG. 4 shows a schematic sectional illustration of a pump with a wobble guide known per se
- FIG. 9 shows a schematic representation of the connection between the actuator and the stator by means of a catch spring and catch hook
- 10a is a schematic sectional view of a flat blood pump
- Fig. La shows a pulsatile pump, which as a one-sided system, that is, as an actuator-stator combination is trained.
- the pump is flat and circular.
- a stator 12 and an actuator 15 are arranged in a housing 11.
- the actuator 15 is attracted in the illustration according to FIG. 1 a, which allows the filling of a fluid chamber 16.
- the fluid chamber 16 is delimited towards the actuator 15 by a membrane 161.
- the actuator 15 is attracted by magnetic coils 19, which are ring-shaped here.
- Fig. Lb shows the pulsatile pump during the compression of the fluid chamber 16 after switching off the solenoid 19 by the action of helical compression springs 18.
- the fluid is through the suction or outflow opening . 17 transported out of the fluid chamber 16.
- FIG 2a and 2b show the pumping process of the pulsatile pump using two symmetrically opposite stator-actuator combinations.
- the space available in the pump for the fluid chamber 16 is enlarged, which enables the fluid chamber 16 to be filled.
- the two actuators 15 are pressed together via the helical compression spring 18 when the fluid chamber 16 is emptied, the expulsion process of the fluid by limiting the maximum distance between the actuator 15 and the stator 12 by means of an arrangement of catch hooks 4 and catch springs 3 (FIG 9a to d) is ended.
- the electrical connection lines for the magnet coil 19 are not shown separately here.
- the control and power supply unit for operating the pump can be outside, in the case of a blood pump, e.g. B. worn on a patient's belt.
- the pump has a plurality of helical compression springs 18 arranged on the circumference of a circle, which exert a force on the actuator 15 away from the stator 12. Small troughs are provided in the stator 12 and in the actuator 15 for mounting the helical compression springs 18.
- the swash bearing 14 provided for the axial guidance of the actuator 15 is connected to the base plate of the actuator 15 via connecting elements and associated bolts.
- the use of a swash bearing 14 known per se on the axially extending guide pin 13 for tilting the actuator 15 relative to the stator 12 provides two additional degrees of freedom.
- the tilting of the actuator 15 and the compensating effect can be seen from FIGS. 8a to 8d.
- the invention allows tilting by means of the swash bearing 14 and thereby prevents the guide 13 from jamming. Since the outer diameter of the Stator 12 or the corresponding recesses in the actuator 15 are coordinated with one another in such a way that even if the actuator 15 is tilted, there is no contact or only on the contact surfaces, no jamming can occur at this point either. It is thus possible to safely guide the actuator 15 with respect to the stator 12 with only one axial guide.
- the fluid pump works as follows: When the magnetic coil 19 is supplied with current, a magnetic field is created which exerts a force on the actuator 15 in the direction of the stator 12. Accordingly, the actuator 15 moves along the guide 13 towards the stator 12. The magnetic coil 19 located there is received in the recess of the actuator 15. There are corresponding shapes or recesses and protruding parts of the stator 12 and actuator 15.
- the actuator 15 is now in the engaged position. Along with the movement of the actuator 15 into the engagement position, there is an increase in the space available for the fluid chamber 16, which leads to an inflow of fluid to be transported via the suction opening 17.
- a holding current is first passed through the magnet coil 19 so that the magnetic excitation is maintained and the actuator 15 and stator 12 remain in the engagement position for a while until the blood chamber 16 has filled with blood.
- the power supply to the solenoid 19 is interrupted by the power supply and control unit. Due to the tension force of the helical compression springs 18, the actuator 15 now moves in the direction of the blood chamber 16 and presses the blood chamber 16 together with its side designed as a pressure plate 5, the fluid to be transported being pressed out of the pump via the outflow opening 18. There are suitable valves (not shown) that control the direction of the flow. The movement ends in a further end position of the actuator 15.
- the fluid chamber 16 has pressure equalization openings through which pressure equalization can take place in order to avoid a high negative pressure (FIGS. 1 and 2).
- FIGS. 8a to 8d show the movement of the actuator 15 between the two end positions. Tilting of the actuator 15 is made possible via the wobble bearing 14 (FIG. 4) without the actuator 15 being jammed on the guide 13. Due to the mutual guidance when the stator 12 and actuator 15 mesh, it is ensured that a defined position is present in the engagement position.
- the power required by the electromagnetic drive is approximately 120 W.
- the coil 16 is maximum for each ejection process
- the helical compression springs 18 used preferably have a spring force between 80 and 120 N over a length of 6 mm. The amount of
- Stator 12 is in particular between 5 and 15 mm, the height of the actuator 15 is also 5 to 15 mm
- Pump is preferably between 5 and 11 cm.
- an alternative wobble guide is shown, which is realized by a leaf spring arrangement.
- This wobble guide replaces the guide 13 and the wobble bearing 14 of FIG. 4.
- the pump is constructed as described in relation to FIGS. 1 and 2.
- the wobble guide based on the leaf spring arrangement, has a leaf spring 2, is star-shaped and, starting from an actuator fastening 23, has four legs bent downward by 180 °.
- the stator 12 is connected to the leaf spring 2 via fastening points 32 of the bent leg regions.
- This arrangement provides three degrees of freedom for a movement of the actuator 15 relative to the stator 12, namely one degree of freedom in the axial direction and two degrees of freedom for tilting.
- the leaf spring arrangement acts centering, since a non-centric force attack on the actuator 15 experiences a counterforce in the direction of the longitudinal axis of the leaf spring 2.
- the wobbling movement ensures, similarly as already described, that actuator 15 and stator 12 do not jam and, despite the small overall heights of actuator 15 and stator 12, these elements can interlock securely to further reduce the overall height.
- the embodiments of the helical compression springs 18 shown in FIGS. 6 and 7 serve, as described with reference to FIGS. 1 and 2, to generate a force on the actuator 15 away from the stator 12, so that the actuator 15 in when the magnetic excitation is lost Direction of the fluid chamber 16 is moved.
- the leaf spring 2 serves both to guide the actuator 15 and to generate a force for moving the actuator 15 against the fluid chamber 16.
- the leaf spring 2 is preferably designed to be somewhat harder so that the function of force generation on the actuator 15 is reliably fulfilled, which means that a smaller degree of tilting is made possible.
- the wobble guide shown in FIG. 3 initially corresponds to the wobble guide of FIG. 5.
- a further leaf spring 2 a of identical construction but of a smaller size is provided, which is arranged within the larger leaf spring 2.
- the respective mounting surfaces are coupled to one another via a connecting piece 33.
- the bent-over leg ends in the leaf springs 2 and 2a are connected to the stator 12 via fastening points.
- the fastening of the actuator 15 in turn serves a fastening point on the upper side of the fastening surface of the leaf spring 2.
- this leaf spring arrangement leads to an exclusively linear guidance of the actuator 15 relative to the stator 12, since tilting of the outer leaf spring 2 by the inner leaf spring 2a is prevented or at least greatly reduced.
- This variant thus realizes a central linear guidance of the actuator 15 with respect to the stator 12.
- the coordinated elements of the stator 12 and actuator 15 must be designed very precisely so that jamming is reliably excluded.
- Fig. 7 shows a combination of double leaf spring assembly 2 and 2a, in addition to the Have leaf springs 2 and 2 helical compression springs 18.
- the leaf springs 2 and 2a are dimensioned smaller, since they are only responsible for the guiding function.
- FIG. 10 shows an example of the embodiment of a blood pump according to the invention, which instead of the guide 13 has a leaf spring arrangement according to FIG. 6 with a simple leaf spring 2 and helical compression springs 13. Likewise, a stroke limitation according to FIG. 9a is realized here.
- the embodiment of the invention is not limited to the exemplary embodiments explained above.
- the invention is not restricted to the use of intermeshing shapes of U-shaped cross section. It is essential for the invention that, in a drive for a fluid pump, the stator 12 and the actuator 15 have corresponding shapes or recesses and projections on their mutually adjacent sides such that the stator 12 and actuator 15 engage in the engagement position and the overall height of the Drive is reduced, and / or that a guide of the actuator is provided.
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU22844/00A AU2284400A (en) | 1998-12-18 | 1999-12-20 | Pulsatile pump |
JP2000589236A JP2002532204A (ja) | 1998-12-18 | 1999-12-20 | 脈動ポンプ |
EP99966977A EP1140249A1 (de) | 1998-12-18 | 1999-12-20 | Pulsatile pumpe |
CA002355324A CA2355324A1 (en) | 1998-12-18 | 1999-12-20 | Pulsatile pump |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19860301 | 1998-12-18 | ||
DE19860301.0 | 1998-12-18 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2000037126A1 true WO2000037126A1 (de) | 2000-06-29 |
Family
ID=7892831
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1999/010102 WO2000037126A1 (de) | 1998-12-18 | 1999-12-20 | Pulsatile pumpe |
Country Status (8)
Country | Link |
---|---|
EP (1) | EP1140249A1 (de) |
JP (1) | JP2002532204A (de) |
CN (1) | CN1330561A (de) |
AU (1) | AU2284400A (de) |
CA (1) | CA2355324A1 (de) |
DE (1) | DE19963533A1 (de) |
RU (1) | RU2211709C2 (de) |
WO (1) | WO2000037126A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2023209547A1 (en) * | 2022-04-26 | 2023-11-02 | CorWave SA | Blood pumps having an encapsulated actuator |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2020246A1 (de) * | 2007-08-03 | 2009-02-04 | Berlin Heart GmbH | Steuerung einer Rotationsblutpumpe mit wählbaren therapeutischen Optionen |
US7799016B2 (en) * | 2008-06-20 | 2010-09-21 | Pharmaco-Kinesis Corporation | Magnetic breather pump and a method for treating a brain tumor using the same |
EP2860399A1 (de) | 2013-10-14 | 2015-04-15 | ECP Entwicklungsgesellschaft mbH | Verfahren zum Betrieb einer Versorgungseinrichtung, die einen Kanal mit einer Flüssigkeit beaufschlagt, sowie Versorgungseinrichtung |
CN106668966B (zh) * | 2017-01-13 | 2019-03-22 | 上海理工大学 | 一种电磁驱动泵 |
CN110425119A (zh) * | 2019-08-21 | 2019-11-08 | 劳特士(嘉兴)机械设备有限公司 | 一种气动泵吸装置 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5599173A (en) | 1994-02-10 | 1997-02-04 | Baxter International, Inc. | Blood pump system |
DE19609281C1 (de) | 1996-02-27 | 1997-08-21 | Thomas Dipl Ing Haehndel | Magnetofluidunterstützter elektromagnetischer Antrieb für eine Blutpumpe zur Unterstützung oder zum teilweisen bis totalen Ersatz des Herzens |
US5665070A (en) * | 1995-01-19 | 1997-09-09 | I-Flow Corporation | Infusion pump with magnetic bag compression |
-
1999
- 1999-12-20 RU RU2001116255/14A patent/RU2211709C2/ru not_active IP Right Cessation
- 1999-12-20 CA CA002355324A patent/CA2355324A1/en not_active Abandoned
- 1999-12-20 AU AU22844/00A patent/AU2284400A/en not_active Abandoned
- 1999-12-20 CN CN99814681A patent/CN1330561A/zh active Pending
- 1999-12-20 DE DE19963533A patent/DE19963533A1/de not_active Ceased
- 1999-12-20 WO PCT/EP1999/010102 patent/WO2000037126A1/de not_active Application Discontinuation
- 1999-12-20 EP EP99966977A patent/EP1140249A1/de not_active Withdrawn
- 1999-12-20 JP JP2000589236A patent/JP2002532204A/ja active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5599173A (en) | 1994-02-10 | 1997-02-04 | Baxter International, Inc. | Blood pump system |
US5665070A (en) * | 1995-01-19 | 1997-09-09 | I-Flow Corporation | Infusion pump with magnetic bag compression |
DE19609281C1 (de) | 1996-02-27 | 1997-08-21 | Thomas Dipl Ing Haehndel | Magnetofluidunterstützter elektromagnetischer Antrieb für eine Blutpumpe zur Unterstützung oder zum teilweisen bis totalen Ersatz des Herzens |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2023209547A1 (en) * | 2022-04-26 | 2023-11-02 | CorWave SA | Blood pumps having an encapsulated actuator |
Also Published As
Publication number | Publication date |
---|---|
CN1330561A (zh) | 2002-01-09 |
AU2284400A (en) | 2000-07-12 |
RU2211709C2 (ru) | 2003-09-10 |
CA2355324A1 (en) | 2000-06-29 |
EP1140249A1 (de) | 2001-10-10 |
JP2002532204A (ja) | 2002-10-02 |
DE19963533A1 (de) | 2000-07-06 |
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