Blood pump stroke volume limiter

Details Blood pump stroke volume limiter Blood pump stroke volume limiter

1976-01-09

1977-05-17

Croyle, Carlton R.

Expansible chamber devices

Displacement control of plural cylinders arranged in...

Flexible wall-type working member

92 136, 417384, 417394, F01B 1902, F15B 1524

Patent

active

040234681

ABSTRACT:
A pneumatic pump adapted primarily as a left ventricular heart assist device includes a flexible bladder with a rigid housing. A pneumatic driver applies rhythmical pulses between the bladder and the housing to repetitively collapse the bladder and establish a pumping action through the bladder, in conjunction with check valves in the inlet and outlet to the bladder. Between the driver and the pump there is provided a pneumatic pulse limiter which includes a flexible diaphragm isolating the driver from the pump. Pulses from the driver are transmitted to the pump only through the flexible diaphragm and the diaphragm is constrained to move only within established limits. Regardless of the magnitude of the pulse from the driver, the maximum pulse applied to the pump cannot exceed that corresponding to the maximum displacement of the diaphragm.
Between successive pulses, the portion of the system between the driver and the flexible diaphragm is depressurized. The rapidity with which depressurization occurs is enhanced by provision of a quick release valve between the driver and the diaphragm.

REFERENCES:
patent: 1183486 (1916-05-01), Pardue
patent: 2576747 (1951-11-01), Bryant
patent: 3000320 (1961-09-01), Ring
patent: 3130646 (1964-04-01), Pennington
patent: 3143252 (1964-08-01), Shapiro
patent: 3282049 (1966-11-01), Benton
patent: 3550162 (1970-12-01), Huffman et al.

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