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US5346458A
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US
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Electrohydraulic energy converter for cardiac assist devices and artificial hearts
Assignee: Abiomed Inc
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Filing: 1991-06-25
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Granted: 1994-09-13
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Expires: 2011-06-25
Abstract
Abstract An apparatus for converting electric energy into pumping energy is disclosed. The apparatus is utilized to drive a cardiac assist device or an artificial heart. These devices are volume displacement blood pumps which require an alternating force or pressure for their pumping action. To generate this alternating pressure, a centrifugal pump driven by an electric motor pumps a hydraulic fluid which acts on the diaphragm of a blood pump. The alternating flow of the hydraulic transmitting fluid is generated by an axial shift of the impeller of the centrifugal pump.
Inventors
- 👤 Klaus Affeld
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:09
CPC Classifications
F; F04; F04D; F04D15/00; F04D15/0027; A; A61; A61M; A61M60/00; A61M60/10; A61M60/122; A61M60/196; A61M60/40; A61M60/424; A61M60/427; A61M60/43; A61M60/435; A61M60/50; A61M60/508; A61M60/538; A61M60/80; A61M60/855; A61M60/89; A61M60/894; F04D29/00; F04D29/04; F04D29/042; F04D29/40; F04D29/42; F04D29/44; F04D29/46; F04D29/50; F04D29/506; A61M60/126; A61M60/148
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
157 words
A system to convert electric energy into hydraulic energy of a transmitter fluid to actuate and control a diaphragm or flexible wall of a blood pump for use in a cardiac assist system or in a total artificial heart comprising: a continuously running radial centrifugal hydraulic pump with an impeller having inlets on both sides; first and second diffusor elements arranged back to back, said first diffusor element connected to and issuing into a housing of a first blood pump, and said second diffusor element connected to and issuing into either a displacement chamber, or a housing of a second blood pump, wherein said first and second diffusor elements circumferentially surround said impeller; a brushless electric motor mounted in fixed relationship to said first blood pump housing and having a stator and a rotor, said rotor being connected with the impeller of the centrifugal pump; and means for initiating axial movement of said rotor and said impeller.
Claim 2
Independent Claim
157 words
A system to convert electric energy into hydraulic energy of a transmitter fluid to actuate and control a diaphragm or flexible wall of a blood pump for use in a cardiac assist system or in a total artificial heart comprising: a continuously running radial centrifugal hydraulic pump with an impeller having inlets on both sides; first and second diffusor elements arranged back to back, said first diffusor element connected to and issuing into a housing of a first blood pump, and said second diffusor element connected to and issuing into either a displacement chamber, or a housing of a second blood pump, wherein said first and second diffusor elements circumferentially surround said impeller; a brushless electric motor mounted in fixed relationship to said first blood pump housing and having a stator and a rotor, said rotor being connected with the impeller of the centrifugal pump; and means for initiating axial movement of said rotor and said impeller.
Claim 3
Dependent Claim
32 words
A system to convert electric energy into hydraulic energy as defined in claim 1, in which an occluder blocks the inlet of the impeller of either side depending on its axial position.
Claim 4
Dependent Claim
28 words
A system to convert electric energy into hydraulic energy as defined in claim 1, in which the rotor of the motor is an integrated part of the impeller.
Claim 5
Dependent Claim
31 words
A system to convert electric energy into hydraulic energy as defined in claim 1, wherein an axial shift of said rotor and said impeller is actuated by a driving electromagnetic field.
Claim 6
Dependent Claim
35 words
A system to convert electric energy into hydraulic energy as defined in claim 1, wherein an axial shift of said rotor and said impeller and holding in position is done by the action of magnets.
Claim 7
Dependent Claim
37 words
A system to convert electric energy into hydraulic energy as defined in claim 1, further comprising: a rotor bearing supporting said rotor and configured so said rotor and said impeller move in at least an axial direction.
Claim 8
Dependent Claim
100 words
A diaphragm or flexible wall blood pump comprising: a continuously running radial centrifugal hydraulic pump with an impeller having inlets on both sides; two diffusor elements arranged back to back, one connected to and issuing into a blood pump housing and the other connected to and issuing into a displacement chamber, wherein said diffusor elements circumferentially surround said impeller; a brushless electric motor mounted in fixed relationship to said blood pump housing and having a stator and a rotor, said rotor connected to said impeller; and an axial displacement mechanism located proximal to and initiating axial movement of said impeller.
Claim 9
Dependent Claim
100 words
A diaphragm or flexible wall blood pump comprising: a continuously running radial centrifugal hydraulic pump with an impeller having inlets on both sides; two diffusor elements arranged back to back, one connected to and issuing into a blood pump housing and the other connected to and issuing into a displacement chamber, wherein said diffusor elements circumferentially surround said impeller; a brushless electric motor mounted in fixed relationship to said blood pump housing and having a stator and a rotor, said rotor connected to said impeller; and an axial displacement mechanism located proximal to and initiating axial movement of said impeller.
Claim 10
Dependent Claim
29 words
A diaphragm or flexible wall blood pump according to claim 7, in which an occluder blocks an inlet of the impeller of either side depending on its axial position.
Claim 11
Dependent Claim
21 words
A diaphragm or flexible wall blood pump according to claim 7, wherein said rotor is an integrated part of said impeller.
Claim 12
Dependent Claim
28 words
A diaphragm or flexible wall blood pump according to claim 7, wherein an axial shift of said rotor and said impeller is actuated by a driving electromagnetic field.
Claim 13
Dependent Claim
32 words
A diaphragm or flexible wall blood pump according to claim 7, wherein an axial shift of said rotor and said impeller and holding in position is done by the action of magnets.
Claim 14
Dependent Claim
34 words
A diaphragm or flexible wall blood pump according to claim 7, further comprising: a rotor bearing supporting said rotor and configured so said rotor and said impeller move in at least an axial direction.
Claim 15
Dependent Claim
90 words
A diaphragm or flexible wall blood pump comprising: a continuously running radial centrifugal hydraulic pump with an impeller having inlets on both sides; two diffusor elements arranged back to back and circumferentially surrounding said impeller, wherein each diffusor element is connected to and issues into separate blood pump housings; a brushless electric motor mounted in fixed relationship to said blood pump housings and having a stator and a rotor, said rotor connected to said impeller; and an axial displacement mechanism located proximal to and initiating axial movement of said impeller.
Claim 16
Dependent Claim
90 words
A diaphragm or flexible wall blood pump comprising: a continuously running radial centrifugal hydraulic pump with an impeller having inlets on both sides; two diffusor elements arranged back to back and circumferentially surrounding said impeller, wherein each diffusor element is connected to and issues into separate blood pump housings; a brushless electric motor mounted in fixed relationship to said blood pump housings and having a stator and a rotor, said rotor connected to said impeller; and an axial displacement mechanism located proximal to and initiating axial movement of said impeller.
Claim 17
Dependent Claim
29 words
A diaphragm or flexible wall blood pump according to claim 13, in which an occluder blocks an inlet of the impeller of either side depending on its axial position.
Claim 18
Dependent Claim
21 words
A diaphragm or flexible wall blood pump according to claim 13, wherein said rotor is an integrated part of said impeller.
Claim 19
Dependent Claim
28 words
A diaphragm or flexible wall blood pump according to claim 13, wherein an axial shift of said rotor and said impeller is actuated by a driving electromagnetic field.
Claim 20
Dependent Claim
32 words
A diaphragm or flexible wall blood pump according to claim 13, wherein an axial shift of said rotor and said impeller and holding in position is done by the action of magnets.
Claim 21
Dependent Claim
34 words
A diaphragm or flexible wall blood pump according to claim 13, further comprising: a rotor bearing supporting said rotor and configured so said rotor and said impeller move in at least an axial direction.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-09-12 | 1998-03-14 | 1998-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-09-12 | 2002-03-14 | 2002-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-09-12 | 2006-03-14 | 2006-09-13 | $7700.00 | Window Closed / Lapsed |