Patent US4957504A successfully refreshed from Google Patents.
US4957504A
Expired / Lapsed
US
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Implantable blood pump
Assignee: Individual
•
Filing: 1988-12-02
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Granted: 1990-09-18
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Expires: 2008-12-02
Abstract
Abstract An implantable blood pump (10) for providing either continuous or pulsatile blood flow to the heart. The pump includes a stator (16) having a cylindrical opening (14), an annular array (36 or 38) of electromagnets (40, 42) carried by the stator concentric with the cylindrical opening and lying in a plane transverse to the axis (26) of the opening, a bearing (28) carried by the stator and extending across the cylindrical opening, and a rotor (12) supported by the bearing for rotation about the axis of the cylindrical opening, the rotor being in the form of an Archimedes screw and having a permanent magnet (48) in its periphery which lies in the same plane as the array of electromagnets. A controller (44) is provided which is capable of causing the array of electromagnets to be sequentially energized to cause the rotor to rotate. A heart beat sensing device (50) and a rotor speed sensing device (54) may be associated with the controller so the controller may vary the rotational speed of the rotor so that the output of the pump is varied between a high ouptut synchronized with a heart beat and a low output.
Inventors
- 👤 William M. Chardack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:10
CPC Classifications
A; A61; A61M; A61M60/00; A61M60/40; A61M60/403; A61M60/422; A61M60/10; A61M60/122; A61M60/165; A61M60/178; A61M60/20; A61M60/205; A61M60/216; A61M60/237; A61M60/50; A61M60/508; A61M60/515; A61M60/531; A61M60/538; A61M60/562; A61M60/569; A61M60/80; A61M60/802; A61M60/804; A61M60/806; A61M60/818; A61M60/825; A61M60/855; A61M60/861; A61M60/871; A61M60/873; A61B; A61B17/00; A61B2017/00681; A61B2017/00685; A61M2205/00; A61M2205/33; A61M2205/3303; A61M2205/3331; A61M2205/3334; A61M2230/00; A61M2230/04; A61M60/126; A61M60/148; Y; Y10; Y10S; Y10S415/00; Y10S415/912
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
72 words
An implantable and biocompatible blood pump capable of providing either continuous or pulsatile blood flow, the pump comprising: a stator having a cylindrical opening; bearing means carried by the stator and extending across the cylindrical opening; a rotor supported by the bearing means for rotation about the axis of the cylindrical opening, the rotor being in the form of a helix; and electromagnetic means carried by the stator for driving the rotor.
Claim 2
Dependent Claim
72 words
An implantable and biocompatible blood pump capable of providing either continuous or pulsatile blood flow, the pump comprising: a stator having a cylindrical opening; bearing means carried by the stator and extending across the cylindrical opening; a rotor supported by the bearing means for rotation about the axis of the cylindrical opening, the rotor being in the form of a helix; and electromagnetic means carried by the stator for driving the rotor.
Claim 3
Dependent Claim
78 words
The pump as set forth in claim 1, wherein a permanent magnet is embedded in the periphery of the rotor and the electromagnetic means is an annular array of electromagnets carried by the stator and concentric with the axis of the cylindrical opening, the array lying in a plane transverse to the axis of the cylindrical opening, which plane passes through the permanent magnet carried by the rotor, and wherein the electromagnets are capable of being sequentially energized.
Claim 4
Dependent Claim
50 words
The pump as set forth in claim 2 wherein a second annular array of electromagnets is carried by the stator in a second plane parallel to the first plane, there being a second permanent magnet carried by the rotor and lying in the plane of the second array of electromagnets.
Claim 5
Dependent Claim
12 words
The pump set forth in claim 1 wherein the helix is closed.
Claim 6
Dependent Claim
32 words
The pump as set forth in claim 1 wherein the bearing means are disposed at both ends of the cylindrical opening, opposite ends of the helix being supported by the bearing means.
Claim 7
Dependent Claim
30 words
The pump as set forth in claim 1 wherein all surfaces of the stator, rotor, and bearing which are exposed to the blood being pumped are made of non-thrombogenic materials.
Claim 8
Dependent Claim
36 words
The pump as set forth in claim 1 further comprising control means interconnected with the electromagnetic means and capable of operating the electromagnetic means in such a manner that the rotor is driven at varying speeds.
Claim 9
Dependent Claim
49 words
The pump as set forth in claim 7 further comprising heart beat sensing means capable of sensing a heart beat, the heart beat sensing means being interconnected with the control means, the control means being capable of increasing the output of the pump in sychronism with the heart beat.
Claim 10
Dependent Claim
65 words
The pump as set forth in claim 8 further comprising rotor sensing means capable of sensing the rotational speed of the rotor, said control means additionally being interconnected with the rotor sensing means and said control means being capable of ensuring that the rotor will be rotated at all times to ensure that blood within the pump is always in motion and does not stagnate.
References Cited (Backward Citations)
FR1061407A
Cited
US3273506A
Cited
US3719436A
Cited
GB1440821A
Cited
US3853429A
Cited
DE2410418A1
Cited
US4004299A
Cited
US4688998A
Cited
US4779614A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-09-17 | 1994-03-19 | 1994-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-09-17 | 1998-03-19 | 1998-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-09-17 | 2002-03-19 | 2002-09-18 | $7700.00 | Window Closed / Lapsed |