Fluid feeding pump unit
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United States of America Patent
Stats
-
Aug 3, 1993
Grant Date -
N/A
app pub date -
Oct 7, 1991
filing date -
Oct 5, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A pump unit for assisting in the blood feeding operation of a heart includes a pair of pumps 7a, 7b connected in parallel with each other. When the pump 7a (or 7b) has reached its expanded position and the pump 7b (or 7a) has reached its contracted position, the operation is changed so that the pump 7a (or 7b) is set up for contraction while the pump 7b (or 7a) is set up for expansion. A time difference TCM between the time when the expanded position is reached and the time when the contracted position is reached is determined. If TCM>Tr, a driving pressure for contraction is changed to a higher value while if TCM
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