Pumps – With signal – indicator – or inspection means
Patent
1997-04-02
1999-07-27
Thorpe, Timothy
Pumps
With signal, indicator, or inspection means
417476, 604153, F04B 4308
Patent
active
059279516
ABSTRACT:
The present invention is a disposable combination of tubing components for use with the roller pump that limits the negative pressure said pump generates (e.g. during left ventricular venting). The device consists of pump tubing and a shunt with resistance to flow placed between the inlet and outlet of the pump tubing. The device may also incorporate interconnecting tubing and a one way valve at the pump inlet tubing. The valve decreases the likelihood of pumping air or fluid into the ventricle with accidental pump reversal. In one preferred embodiment the device is called the Better-Ventera. The pump tubing of the device collapses more readily than tubing currently being used for either venting or suction applications, thus limiting the negative pressure generated by the pump to safer levels. In addition, the maximum suction generated by the pump is further limited by recirculation of flow between the pump inlet and outlet. The recirculation acts to "break" high suction. As pump inlet pressure decreases, flow through the shunt increases to maintain the negative pressure above that possible without the recirculation line. If a higher suction is desired, the shunt tubing can be clamped. Unlike present devices, the Better-Venter.TM. provides additional safety in a completely contained system, without introducing air into the blood lines or releasing blood external to the circuit.
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patent: 4650471 (1987-03-01), Tamari
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patent: 4828462 (1989-05-01), McBurnett
patent: 5052900 (1991-10-01), Austin
patent: 5336051 (1994-08-01), Tamari
Korytnyk Peter G.
Thorpe Timothy
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