Pumping arrangement for intravenous supply of fluids
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Apr 6, 1993
Grant Date -
N/A
app pub date -
Feb 12, 1992
filing date -
Feb 14, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A pumping arrangement including a squeezing device for deforming a length of pliant p.v.c. tubing first in one direction locally to reduce its volume and in another tending to restore its original cross-section and, on either side of squeezing device, inlet and outlet valves which operate by occluding the tubing. The squeezing device and the valves are controlled by a microprocessor control unit such that inlet valve is open and outlet valve shut while the squeezing device is relaxed and thereafter outlet valve is open and inlet valve shut while the squeezing device is operated to deform the tubing, this sequence repeating. Downstream of the output valve is a pressure responsive device providing input to the control unit whereby upon a rise in pressure in the delivery portion of tubing due to a restriction, the squeezing device is disabled and valves are open together to allow excess fluid to pass back towards the fluid source.
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Family
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