Air trap for shutting off flexible plastic tubing

Details Air trap for shutting off flexible plastic tubing Air trap for shutting off flexible plastic tubing

1989-01-19

1990-05-15

Fox, John C.

Valves and valve actuation

Tube compressors

Fluid pressure actuated

137552, 604 67, F16K 707

Patent

active

049251520

ABSTRACT:
This invention relates to an air trap for shutting off flexible plastic tubing, particularly infusion tubing, for instance, during a transfusion of blood the air trap will reliably shut off the supply of blood when air bubbles are contained in the liquid entering the infusion tubing. This is ensured in that the air trap for shutting off flexible plastic tubing, particularly infusion tubing, comprises a flat head (mushroom-shaped head), which on one side bears on a ciaphragm, which defines a pressure chamber, and on the other side is provided with a guide stem, which is provided with means for squeezing a flexible plastic tubing in a receptacle and is operable to release the tubing in the receptacle under the action of a gas pressure in the pressure chamber and is spring-biased to cause said squeezing means to squeeze the flexible tubing in the receptacle when the pressure chamber is pressure-relieved.

REFERENCES:
patent: 2986160 (1961-05-01), Acomb
patent: 3823724 (1974-07-01), Davis
patent: 3882899 (1975-05-01), Ginsberg et al.
patent: 4797655 (1989-01-01), Orndal

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