Valve for biological systems

Claim 1

An electrically controlled, contamination-free valve for systems of the type feeding fluid through compressible tubes and comprising: A. a base supporting said tubes; B. a plurality of tubes adapted to extend from a patient to a source of fluid supply, a compressible portion of said tubes extending across said base; C. a rocker member pivoted in said base having a rocker arm above said base and a rocker arm below said base; D. two of said compressible tubes being resiliently supported upon the top of said base, and two of said tubes being resiliently supported upon the bottom of said base, so that said rocker arm on pivoting simultaneously engages and compresses on the opposite sides of said base one of said top tubes and one of said bottom tubes, and alternately the other ones of said top and bottom tubes while disengaging and releasing the others of said tubes; E. an electrical supporting system including: i. an electronically energizable solenoid connected to said rocker, so as to pivot said rocker and compress and release said tubes upon electrical energization; ii. a light exciter source and opposed photocell positioned on opposite sides of one of said tubes, said photocell being connected to said solenoid, so as to activate said solenoid and pivot said rocker as light transmitted by said light exciter through said tubing is sensed by the opposed photocell.