Fluid handling – Control by change of position or inertia of system
Patent
1986-02-03
1986-11-11
Nilson, Robert G.
Fluid handling
Control by change of position or inertia of system
137512, 137848, 417478, 604 10, 604185, A61M 2700
Patent
active
046216545
ABSTRACT:
A valve assembly for relieving intracraneal pressure includes a valve housing adapted for implantation and having an inlet port for connection to a ventricular catheter and an outlet port for connection to a venus or peritoneal catheter. The valve housing includes a fluid passage, the flow through which is controlled by a first pressure responsive valve of relatively high resistence and a second pressure responsive valve of relatively low resistence spaced downstream of said first pressure responsive valve. An attitude responsive valve is disposed in said fluid passage in parallel with said first pressure responsive valve. The valve assembly is implanted in a patient with the attitude responsive valve in a closed position when the patient is in an upright position and in an open position when the patient is in a horizontal position. The employment of pressure responsive and attitude responsive valves in parallel provides ventricular pressure relief regardless of the patient's position.
REFERENCES:
patent: 1352650 (1920-09-01), Blanchard
patent: 2969066 (1961-01-01), Holter
patent: 3566875 (1971-03-01), Stoehr
patent: 3889687 (1975-06-01), Harris
patent: 3985140 (1976-10-01), Harris
Nilson Robert G.
Weber Richard D.
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