Measuring and testing – With fluid pressure – Dimension – shape – or size
Patent
1984-10-23
1986-07-08
Levy, Stewart J.
Measuring and testing
With fluid pressure
Dimension, shape, or size
73 4R, 73168, 604 9, G01M 1900
Patent
active
045985790
ABSTRACT:
A portable instrument system is provided for the testing of pressure and flow characteristics of implantable ventricular shunt valves using a gaseous testing fluid that may be drawn from the testing environment. The system includes a rate pump having a control mechanism that provides a variety of selective constant flow rates so that the valve characteristics can be determined under various operating conditions. Fluid communication is provided between the pump, the valve and a pressure sensing device such that the pressure sensing device receives the same pressure and flow rate that the valve does. Typically, the pressure sensing device is a gauge transducer that utilizes atmospheric pressure as a reference point and senses the changes in the gas pressure in the valve, relaying the pressure readings to a digital display or chart recorder.
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Cummings Joel
Hooven Michael D.
Cordis Corporation
Levy Stewart J.
Noland Tom
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