Compact Portable Pneumatic Driver

We will develop of an external, portable pneumatically coupled driver for use with pneumatically poventricular assist devices. The driver utilizes a long stroke piston mechanism to reduce motor torquassociated motor weight. Pressure will be monitored continuously and used to predict VAD displacemenmodeled based on basic thermodynamic principles, with empirically derived corrections. Displacementduring VAD filling to retrospectively evaluate the ejection estimate. When a displacement transducerthe pump design it will be used as an independent measure of pump displacement. VAD ejection will bereduce blood trauma, to prevent over-collapse of the VAD, and to improve system efficiency.