Pumps – With condition responsive pumped fluid control – Pressure responsive relief or bypass valve
Patent
1993-02-10
1995-07-04
Bertsch, Richard A.
Pumps
With condition responsive pumped fluid control
Pressure responsive relief or bypass valve
417474, F04B 4308
Patent
active
054294835
ABSTRACT:
The specification describes several uses for pressure sensitive valves during extracorporeal pumping in one embodiment, an improved pumping loop for a roller pump is used in an extracorporeal circuit with a pressure relief valve and pump tubing. The inlet and outlet of the tubing are connected respectively to the outlet and inlet of said valve via two 3 way connections, across the outlet of the pump. The pumping loop allows recirculation of pumped liquid between the inlet and outlet of the pump when the outlet pressure generated by said pump exceeds a set value thereby limiting the pump outlet pressure to the set pressure. The pressure relief valve can also be placed at the inlet if the pump to protect the circuit from excess negative pressure that the pump can generate. The pressure relief valve in combination with the pump loop provides an accurate means to dynamically set the occlusion of the tubing within the roller pump.
REFERENCES:
patent: 4515536 (1985-05-01), van Os
patent: 4515589 (1985-05-01), Austin et al.
patent: 4552552 (1985-11-01), Polaschegg et al.
patent: 4650471 (1987-03-01), Tamari
patent: 5052900 (1991-10-01), Austin
patent: 5215450 (1993-06-01), Tamari
patent: 5222980 (1993-06-01), Gealow
patent: 5273406 (1993-12-01), Feygin
patent: 5336051 (1994-08-01), Tamari
Bertsch Richard A.
Korytnyk Peter
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