Muscle stimulator with variable duty cycle

Details Muscle stimulator with variable duty cycle Muscle stimulator with variable duty cycle

1989-12-06

1991-12-03

Shay, Randy Citrin

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

Corporeal artificial heart, heart assist , control...

600 16, A61M 110

Patent

active

050696807

ABSTRACT:
Apparatus and method of controlling a muscle stimulator by varying the duty cycle. The muscle stimulator is particularly adapted to a skeletal muscle powered cardiac assist system. An activity or other sensor is used to determine the requirement for cardiac output. A second electrical sensor is used to determine the cardiac rate. The outputs of these two sensors are employed to select a duty cycle for muscle stimulation of the skeletal muscle. The duty cycle is lowered for reasons of efficiency and safety during periods of very high or very low cardiac rate or body activity. The number of stimulation pulses within a burst is similarly increased when cardiac demand is high to ensure maximum contractile force of the skeletal muscle during each stimulation burst.

REFERENCES:
patent: 4140132 (1979-02-01), Dahl
patent: 4143661 (1979-03-01), LaForge et al.
patent: 4384829 (1983-05-01), Conley et al.
patent: 4453537 (1984-06-01), Spitzer
patent: 4457673 (1984-07-01), Conley et al.
patent: 4666443 (1987-05-01), Portner
patent: 4685446 (1987-08-01), Choy
patent: 4771765 (1988-09-01), Choy et al.
Neilson et al., "Left Ventricular Assistance in Dogs Using a Skeletal Muscle Powered Device for Diastolic Augmentation", Heat Transplantation, vol. IV, No. 3, May 1985, pp. 343-347.

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