Modeling of a dielectric elastomer diaphragm for a prosthetic blood pump

Nakhiah Goulbourne; Mary I. Frecker; Eric Michael Mockensturm; Alan J. Snyder

doi:10.1117/12.484388

28 July 2003 Modeling of a dielectric elastomer diaphragm for a prosthetic blood pump

Nakhiah Goulbourne, Mary I. Frecker, Eric Michael Mockensturm, Alan J. Snyder

Proceedings Volume 5051, Smart Structures and Materials 2003: Electroactive Polymer Actuators and Devices (EAPAD); (2003) https://doi.org/10.1117/12.484388
Event: Smart Structures and Materials, 2003, San Diego, California, United States

Abstract

The electromechanical behavior of dielectric elastomers is to be exploited for medical application in artificial blood pumps. It is required that the pump diaphragm achieves a swept volume increase of 70 cc into a systolic pressure of 120 mmHg with the main design objective being volumetric efficiency. As such, a model that accommodates large deformation behavior is used. In order to design prosthetic blood pumps that closely mimic the natural pumping chambers of the heart, a dielectric elastomer diaphragm design is proposed. The elastomer's change in shape in response to the applied electric field will permit it to be the active element of the pump just as the ventricular walls are in the natural heart. A comprehensive analytical model that accounts for the combined elastic and dielectric behavior of the membrane is used to compute the stresses and deformations of the inflated membrane. Dielectric elastomers are often pre-strained in order to obtain optimal electromechanical performance. The resulting model incorporates pre-strain and shows how system parameters such as pre-strain, pressure, electric field, and edge constraints affect membrane deformation. The model predicts more than adequate volume displacement for moderate pre-strain of the elastomer.

Citation Download Citation

Nakhiah Goulbourne, Mary I. Frecker, Eric Michael Mockensturm, and Alan J. Snyder "Modeling of a dielectric elastomer diaphragm for a prosthetic blood pump", Proc. SPIE 5051, Smart Structures and Materials 2003: Electroactive Polymer Actuators and Devices (EAPAD), (28 July 2003); https://doi.org/10.1117/12.484388

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