Pipes and tubular conduits – With pressure compensators – Variable capacity chambers
Patent
1995-06-07
2000-03-21
Fox, John
Pipes and tubular conduits
With pressure compensators
Variable capacity chambers
604 4, F16L 5504
Patent
active
060390786
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. Other applications for the pressure sensitive device include inline noninvasive pressure isolator, and pressure relief across other devices. Various designs are introduced.
REFERENCES:
patent: 2575240 (1951-11-01), Thompson
patent: 3490732 (1970-01-01), Leroy
patent: 5061365 (1991-10-01), Utterberg
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