Valves and valve actuation – Tube compressors – Roller tube contacting element
Patent
1988-11-28
1989-08-15
Fox, John
Valves and valve actuation
Tube compressors
Roller tube contacting element
251 4, 604250, F16K 704
Patent
active
048567558
ABSTRACT:
A device for controlling the flow of a parenteral fluid, comprises a resilient tubular body of an infusion tube having a flattened portion with two parallel opposed walls. Each wall has a tapering groove, the grooves together defining a longitudinal region of non-contact between the walls of tapering cross-section. Regulating means is provided for flexing a short length of the body about a longitudinal axis of the body so as to urge the two walls together so that the rate of flow is determined by the cross-section of the region of non-contact at said length. Flexure about the longitudinal axis of the body avoids cold-flow of the region of non-contact. The regulating means comprises a support and an operating member longitudinally movable relative to the support, the body being flexed at said length by the co-operation of the support and the operating member. The support is preferably a channel having side walls which define grooves to guide a roller for longitudinal movement relative to the channel. Either the support or the roller has a rib, while the other has a complementary groove. A central part of the body is flexed into the groove by the rib.
REFERENCES:
patent: 3893468 (1975-07-01), McPhee
patent: 4066238 (1978-01-01), Clarke
patent: 4475708 (1984-10-01), Beeher, Jr.
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