Fluid handling – Line condition change responsive valves – Direct response valves
Patent
1990-07-27
1991-10-08
Rivell, John
Fluid handling
Line condition change responsive valves
Direct response valves
137538, F16K 1502
Patent
active
050545183
ABSTRACT:
The present valve, employable by persons affected by hydrocephalus, permits discharge into suitable offtake branches of the excess cephalorhachidian fluid existing in the ventricles of the brain. The valve basically consists of a hollow cylindrical body (1) having inside a seat (5) with an enlarging triangular shape designed to interact with an aptly-shaped capsule or small piston (6) and placed against an antagonist spring (7). This pattern permits to offset the varying amounts of ventricular fluid pressures, discharging outside any fluid, whether large or small, through suitable offtake branches and at the same time it accomplishes a self-cleaning function which ensures a constant flow efficiency.
REFERENCES:
patent: 764642 (1904-07-01), Stenwall
patent: 1292613 (1919-01-01), Kessler
patent: 2005813 (1935-06-01), Thorsen
patent: 2977804 (1961-04-01), Scholin
patent: 3092133 (1963-06-01), Clark
patent: 3122162 (1964-02-01), Sands
patent: 3366138 (1968-01-01), Graham
patent: 3752183 (1973-08-01), Griswold
patent: 4675003 (1987-06-01), Hooven
patent: 4682625 (1987-07-01), Christopher
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