Fluid feeding pump unit

Details Fluid feeding pump unit Fluid feeding pump unit

1991-10-07

1993-08-03

Cohen, Lee S.

Surgery

Cardiac augmentation

623 3, A61N 1362

Patent

active

052324346

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<Tr, a driving pressure for contraction is changed to a lower value. Tr represents a non-responsive interval which can be adjusted by an operator. When Tr has a high value, the pump exhibits a low flow rate which serves as a drive to assist in the delivery of blood by the heart. In this manner, the operator is enabled to adjust the driving flow rate.

REFERENCES:
patent: 4794910 (1989-01-01), Mushika
patent: 4796606 (1989-01-01), Mushika
patent: 4832005 (1989-05-01), Takamiya et al.
patent: 4974774 (1990-12-01), Nakagawa et al.

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