Pumping and pressure detection using flexible tubes
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United States of America Patent
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-
Sep 15, 1998
Grant Date -
N/A
app pub date -
Sep 12, 1996
filing date -
Mar 21, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A peristaltic pump unit (18) has a flexible infusate line (28) which is repeatedly compressed by a flat plate like pusher (30). Transverse valve plates (32, 34), on either side of the pusher (30), operate sequentially to close the line in front of and behind the pusher. A resistive pressure sensor (50), between the two valves, provides signals to a microprocessor (46) which provides the system monitoring capabilities. Consistency in dose rate is provided by arranging for the flexible line (28) to be received in an elongate groove or channel (58) which acts to restrain sideways bulging of the line as it is being compressed by the pusher.
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