Shunt valve
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United States of America Patent
Stats
-
Jun 14, 1983
Issued Date -
N/A
app pub date -
Apr 28, 1982
filing date -
Sep 23, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a surgically implantable shunt system for venting cerebrospinal fluid in the treatment of hydrocephaly, a valve and the method of testing it are disclosed. The valve comprises an elongate hollow valve body into which a flat plate tightly fits, partitioning the valve body into an outlet and an inlet chamber. The flat plate has a circular aperture connecting the chambers and upon which rests a spherical ball of diameter larger than the aperture. A flat spring biases the ball against the circular periphery of the aperture creating a circular seal and providing a precisely defined back pressure, low hysteresis and low susceptibility to bridging by debris. Testing for leakage is accomplished by illuminating with light of a suitable frequency the aperture with ball seated and detecting any light transmitted therethrough.
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