Surgery – Devices transferring fluids from within one area of body to... – With flow control means
Patent
1986-10-21
1988-10-11
Truluck, Dalton L.
Surgery
Devices transferring fluids from within one area of body to...
With flow control means
137504, 137508, 137859, 604247, A61M 2700
Patent
active
047768398
ABSTRACT:
An implantable valve for controlling the passage of cerebrospinal fluid (CSF) from a ventricle of the brain to a suitable drainage location in the body includes a movable diaphragm responsive to pressure differentials between the ventricle and the drainage location. When the pressure differential is below a minimum threshold level, the valve is closed and CSF flow is prevented. When the pressure differential increases beyond the minimum threshold, the valve operates in a constant pressure mode to maintain a first predetermined CSF pressure differential across the valve. When the differential pressure increases beyond an intermediate threshold level, the valve operates in a constant flow mode to maintain a desired constant CSF flow rate through the valve. When the pressure differential increases beyond a maximum threshold level, the valve operates in a constant pressure mode to maintain a second predetermined CSF pressure differential across the valve. To provide for the various operating modes, the valve includes a valve stem and a valve closure member, which coact with a valve seat carried on the diaphragm. The valve stem is of an improved one-piece construction which can be readily fabricated using conventional manufacturing techniques.
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Cordis Corporation
Truluck Dalton L.
LandOfFree
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