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Ann Thorac Surg 1999;68:780-784
© 1999 The Society of Thoracic Surgeons

Innovative Circulatory Support Systems

A ventricular assist device powered by conditioned skeletal muscle

Robert L. Whalen, PhDa, Christopher L. Richards, MSa, Gilbert W. Lim, MSa, Craig W. Sherman, MSa, John C. Norman, MDa, Gill B. Bearnson, MSb, Gregory L. Burns, DVM, PhDb, Donald B. Olsen, DVMb

a Whalen Biomedical Laboratories, Somerville, Massachusetts, USA
b The University of Utah, Salt Lake City, Utah, USA

Address reprint requests to Dr Whalen, Whalen Biomedical Laboratories, 11 Miller St, Somerville, MA 02143com.com
e-mail: rlwhalen{at}ix.net

Presented at the Fourth International Conference on Circulatory Support Devices for Severe Cardiac Failure, Houston, TX, Oct 3–5, 1997.

Abstract

Background. We are developing and testing a new ventricular assist device (VAD) to be powered by conditioned skeletal muscle.

Methods. To evaluate the VAD hardware and to develop a muscle training regimen, 8 calves have been used in studies in which the right latissimus dorsi muscle was employed. The experiments were carried out to an approximately 4-month duration.

Results. There was significant conversion of type II (fast twitch) to type I (slow twitch) muscle fibers. This did not correlate well, however, with device performance. The device stroke volumes ranged from approximately 17 to 90 cc. This variability of outcome occurred despite the fact that identical hardware, surgical procedures, and training regimens were employed.

Conclusions. The results from the first eight studies lead us to speculate that perfusion may be important even when the muscle is working at pressures much lower than systemic blood pressure levels. In an attempt to augment tissue perfusion, we plan to investigate thermally induced angiogenesis as a possible mechanism for increasing blood flow to the tissue.




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