Pump arrangement for medical purposes
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United States of America Patent
Stats
-
Jan 6, 1987
Grant Date -
N/A
app pub date -
Mar 7, 1985
filing date -
Mar 7, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Pump arrangement (10) for medical purposes, in particular blood or infusion pump, comprising a pump housing (12) having two pump chambers (16, 18), of which the work chamber (16) is subjected to the liquid to be pumped while the drive chamber (18) is connected via a connecting conduit to a pneumatic pump (14) of restricted pumping volume. This connecting conduit (50) comprises a valve (56) which is opened at the respective changeover point (top and bottom dead-center) of the pump (14) to set the entire pump arrangement (16) to atmospheric pressure.
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