A - Human Necessities – 61 – M
Patent
A - Human Necessities
61
M
128/127, 137/56
A61M 27/00 (2006.01) F16K 1/14 (2006.01) F16K 15/04 (2006.01)
Patent
CA 1150588
ABSTRACT OF THE DISCLOSURE 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 fre- quency the aperture with ball seated and detecting any light transmitted therethrough.
343414
Hakim Carlos A.
Hakim Salomon
George H. Riches And Associates
Hakim Company Limited
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