Fluid handling – Self-proportioning or correlating systems – Self-controlled branched flow systems
Patent
1974-11-25
1976-07-27
Nilson, Robert G.
Fluid handling
Self-proportioning or correlating systems
Self-controlled branched flow systems
13762414, F16K 1122
Patent
active
039713989
ABSTRACT:
Apparatus, adapted for use in explosive as well as nonexplosive atmospheric environments, for alternately applying intermittent compression to the legs of a patient during surgery, postoperative recovery periods and other periods of muscular inactivity to accelerate venous blood flow in the lower extremeties and inferior vena cava and thereby prevent blood clotting in these vessels. A pair of double-walled pneumatic leggings adapted to extend from the ankle to the knee of the patient are provided for fitting on each leg. Each legging is connected by a separate conduit to a non-electrical regulating and timing control circuit adapted to receive compressed air, oxygen or other pressurized gas from any available source and transmit it by means of periodic intermittent pulses alternately to each legging. The control circuit includes a pressure regulating valve for reducing the available inlet supply pressure to a suitable working pressure and adjustable metering valves for controllably varying the volumetric flow rate of gas to each legging to thereby control the time rate of pressure build-up of each pulse. Respective adjustable pressure relief valves are also provided for variably controlling the maximum pressure permitted in each legging and for relieving the pressure at the end of each pulse. The control circuit includes a timing system for causing the pulses to be delivered at alternate regular intervals to the respective leggings, such timing system being adapted to operate entirely by pneumatic actuation so as to eliminate explosion hazard in high oxygen environments. Such timing system comprises a two-diaphragm cycling valve for automatically regulating the alternate charge and discharge of a pair of accumulator tanks, each tank controlling by means of a predetermined rate of pressure increase the timing of the pulses to the respective leggings. The timing system is operatively independent of legging pressure to eliminate the possibility of cycle failure if a legging should develop a leak or become disconnected.
REFERENCES:
patent: 2760511 (1956-08-01), Greef
patent: 3614965 (1971-10-01), Metivier
patent: 3722525 (1971-04-01), Epple
Everett Harry F.
Everett Richard C.
Taylor Duane F.
Williams Norman C.
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