Pumping drive unit

Details Pumping drive unit Pumping drive unit

1989-11-13

1992-09-15

Isabella, David

Prosthesis (i.e., artificial body members), parts thereof, or ai

Corporeal artificial heart, heart assist , control...

600 16, A61M 110, A61N 1362

Patent

active

051473925

ABSTRACT:
A pumping unit is disclosed which alternately applies a positive and a negative pressure, both of given values, to aa drive chamber of an artificial heart. In a first and a second embodiment, air of an elevated pressure which is discharged by an air compressor is fed through a positive pressure accumulator and a positive pressure open/close valve to the drive chamber, and a negative pressure from an air decompressor is fed through a negative pressure accumulator and the negative pressure open/close valve to the drive chamber. Alternating open periods are assigned to the positive and the negative pressure open/close valve. During the open period, each valve is opened and closed in a manner corresponding to the prevailing pressure in the drive chamber so as to maintain the pressure at a constant value. In a third embodiment, a positive pressure regulator valve is interposed between the air compressor and the positive pressure accumulator, and the positive pressure open/close valve is interposed between the positive pressure accumulator and the drive chamber while a negative pressure regulator valve is interposed between the air decompressor and the negative pressure accumulator, and the negative pressure open/close valve is interposed between the negative pressure accumulator and the drive chamber. The positive and the negative pressure open/close valves are opened in an alternate fashion. The positive pressure regulator valve is operated with a given duty cycle which depends on the prevailing pressure from the positive accumulator so that such pressure is maintained at a constant value. The negative pressure regulator valve is operated with a given duty cycle which depends on the prevailing pressure of the negative accumulator so that such pressure is maintained at a given value.

REFERENCES:
patent: 4583525 (1986-04-01), Suzuki et al.
patent: 4794910 (1989-01-01), Mushika
patent: 4796606 (1989-01-01), Mushika
patent: 4974774 (1990-12-01), Nakagawa et al.

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