1980-09-23
1982-06-01
Rosenbaum, C. Fred
Surgery
Truss
Pad
A61M 2700
Patent
active
043322557
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 susceptiblity 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.
REFERENCES:
patent: 1922379 (1933-08-01), Longfellow
patent: 3288142 (1966-11-01), Hakim
patent: 3527226 (1970-09-01), Hakim
patent: 3886948 (1975-06-01), Hakim
patent: 4106510 (1978-08-01), Hakim et al.
Hakim Carlos A.
Hakim Salomon
Hakim Company Limited
Rosenbaum C. Fred
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