Patent US3818934A successfully refreshed from Google Patents.
US3818934A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dampening unit for pulsatile pump
Assignee: American Hospital Supply Corp
•
Filing: 1973-03-09
•
Granted: 1974-06-25
•
Expires: 1993-03-09
Abstract
Abstract A dampening unit is provided for use in combination with a pulsatile pump, a unit which requires pulsatile flow of fluid, and a unit which requires substantially non-pulsatile flow. The dampening unit comprises a casing having an inner cavity and a pair of spaced-apart, flexible diaphragms attached to the casing within the cavity to provide a chamber between the two diaphragms. As fluid flows through the chamber, the flexible diaphragms expand and contract to dampen the pulsatile flow of the fluid. The dampening unit is connected between the pulsatile pump and the unit which requires substantially non-pulsatile flow.
Inventors
- 👤 A Borsanyi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:51
CPC Classifications
A; A61; A61M; A61M1/00; A61M1/36; A61M1/3621; A61M1/3627; A61B; A61B90/00; A61M60/00; A61M60/10; A61M60/104; A61M60/109; A61M60/30; A61M60/31; A61M60/40; A61M60/424; A61M60/427; A61M60/43; A61M60/80; A61M60/855; A61M60/89; A61M60/894; A61M60/20; A61M60/247; A61M60/253; A61M60/268; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/85978; Y10T137/86035; Y10T137/86043
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
92 words
In combination, a pulsatile pump for providing pulsatile flow of fluid, a pulsatile flow device requiring pulsatile flow of fluid connected to the pump, a non-pulsatile flow device requiring substantially non-pulsatile flow connected to the pulsatile device and to the pump to provide a continuous flow circuit, and a dampening unit interposed in the connection between the non-pulsatile flow device and the pump, the dampening unit including flexible diaphragm means in contact with the fluid flowing through the circuit which expands and contracts as the pressure of the fluid increases and decreases.
Claim 2
Dependent Claim
92 words
In combination, a pulsatile pump for providing pulsatile flow of fluid, a pulsatile flow device requiring pulsatile flow of fluid connected to the pump, a non-pulsatile flow device requiring substantially non-pulsatile flow connected to the pulsatile device and to the pump to provide a continuous flow circuit, and a dampening unit interposed in the connection between the non-pulsatile flow device and the pump, the dampening unit including flexible diaphragm means in contact with the fluid flowing through the circuit which expands and contracts as the pressure of the fluid increases and decreases.
Claim 3
Dependent Claim
78 words
The structure of claim 1 in which the pump includes a suction side and a discharge side and the dampening unit comprises a casing having an inner cavity and inlet and outlet openings communicating with the inner cavity, the diaphragm means being secured to the casing within the cavity, the inlet opening of the casing being connected to the non-pulsatile flow device and the outlet opening of the casing being connected to the suction side of the pump.
Claim 4
Dependent Claim
34 words
The structure of claim 1 in which the pulsatile flow device comprises an organ perfusion unit having an organ to be perfused and a reservoir and the non-pulsatile flow device comprises a flow meter.
Claim 5
Dependent Claim
34 words
The structure of claim 2 in which the pulsatile flow device comprises an organ perfusion unit having an organ to be perfused and a reservoir and the non-pulsatile flow device comprises a flow meter.
References Cited (Backward Citations)
US3632473A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-24 | 1977-12-24 | 1978-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-24 | 1981-12-24 | 1982-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-24 | 1985-12-24 | 1986-06-25 | $7700.00 | Window Closed / Lapsed |