Patent US4277706A successfully refreshed from Google Patents.
US4277706A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Actuator for heart pump
Assignee: NU Tech IND Inc
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Filing: 1979-04-16
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Granted: 1981-07-07
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Expires: 1999-04-16
Abstract
Abstract A heart pumpconsisting of a housing having an inlet and an outlet and a diaphragm adapted to be reciprocated to cause flow of flood through the inlet and the outlet, a brushless dc motor mounted on the housing, the motor having a fixed ball screw nut and a ball screw mounted for axial movement with respect to the motor rotor while being fixed against rotation with respect to the rotor whereby rotation of the rotor causes the screw to move axially with respect to the motor thereby actuating the pump diaphragm.
Inventors
- 👤 Milton S. Isaacson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:16
CPC Classifications
H; H02; H02K; H02K7/00; H02K7/06; A; A61; A61M; A61M60/00; A61M60/10; A61M60/122; A61M60/165; A61M60/40; A61M60/424; A61M60/438; A61M60/441; A61M60/443; A61M60/50; A61M60/508; A61M60/538; F; F04; F04B; F04B43/00; F04B43/02; F04B43/04; A61M60/126; A61M60/148; Y; Y10; Y10T; Y10T74/00; Y10T74/18; Y10T74/18568; Y10T74/18576; Y10T74/18664
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
95 words
In a heart pump having a housing, inlet and outlet passageways in said housing, a diaphragm means for reciprocating said diaphragm comprising: a brushless dc motor mounted on said housing, said motor including a fixed stator and a rotor rotatably mounted in said stator, a ball screw nut fixed to said stator, a ball screw engageable with said diaphragm and threadedly connected by anti-friction balls to said nut, said screw being axially slidable and fixed against rotation with respect to said rotor, and means for periodically reversing said motor to cause said screw to reciprocate.
Claim 2
Dependent Claim
95 words
In a heart pump having a housing, inlet and outlet passageways in said housing, a diaphragm means for reciprocating said diaphragm comprising: a brushless dc motor mounted on said housing, said motor including a fixed stator and a rotor rotatably mounted in said stator, a ball screw nut fixed to said stator, a ball screw engageable with said diaphragm and threadedly connected by anti-friction balls to said nut, said screw being axially slidable and fixed against rotation with respect to said rotor, and means for periodically reversing said motor to cause said screw to reciprocate.
Claim 3
Dependent Claim
46 words
In a heart pump as in claim 1 further comprising: a rectangular, axially-extending stem fixed to said rotor, said screw having a rectangular bore mating with said stem to permit axial sliding movement while preventing relative rotary movement of said screw with respect to said rotor.
Claim 4
Dependent Claim
37 words
In a heart pump as in claim 1 further comprising: a plate mounted on said diaphragm, across said housing, a pad, a thrust bearing mounting said pad on said plate, said screw being engageable with said pad.
Claim 5
Dependent Claim
30 words
In a heart pump as in claim 1 further comprising: an end sleeve fixed to said stator and surrounding said nut, said end sleeve being removably threaded into said housing.
Claim 6
Dependent Claim
29 words
In a heart pump as in claim 2, said stem projecting through said ball screw nut to stabilize said ball screw as it is thrust axially toward said diaphragm.
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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) | 1984-07-06 | 1985-01-05 | 1985-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-07-06 | 1989-01-05 | 1989-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-07-06 | 1993-01-05 | 1993-07-07 | $7700.00 | Window Closed / Lapsed |