Pump apparatus
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United States of America Patent
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-
Apr 23, 1991
Grant Date -
N/A
app pub date -
Nov 6, 1989
filing date -
Nov 6, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A pump apparatus such as a stomach pump or the like having a variable volume pumping chamber in the form of a resiliently flexible bulb with a one way flow check valve disposed within the bulb to preclude backflow therefrom, and a second check valve downstream of the resilient bulb, preferably within a reservoir to preclude backflow from the reservoir to the pumping chamber and to contain pumped matter within the reservoir.
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