Patent ID: 8568113
Filing Date: 2013-10-29
Classification: A61M,A61N,F04B,F04C

Abstract:
1. A system, comprising: a pumping chamber forming a closed loop; a pump inlet in fluid communication with the pumping chamber; a pump outlet in fluid communication with the pumping chamber; a first piston movable within the pumping chamber, wherein the first piston comprises a first piston Halbach array; a second piston movable within the pumping chamber and structurally independent of the first piston, wherein the second piston comprises a second piston Halbach array; the first piston and second piston each comprising a leading face, a trailing face, and one or more perimeter faces each between the leading face and the trailing face, each of the one or more perimeter faces being closely adjacent one or more similarly configured chamber inner surfaces as each piston moves within the pumping chamber, each of the one or more perimeter faces further comprising a hydrodynamic bearing surface, each hydrodynamic bearing surface spaced between the leading face and the trailing face, each hydrodynamic bearing surface adjacent the leading face spaced from a respective chamber surface by a spacing greater than a spacing between the hydrodynamic bearing surface adjacent the trailing face and the chamber surface; an electric motor having a rotor with a magnetic link; and an electromagnet electrically energizable from a dormant state to one or more energized states; wherein the system is configured such that during system operation: wherein the system is configured such that during system operation: wherein de-energizing the electromagnet means restoring the electromagnet to a dormant state by substantially depriving the electromagnet of current flow; and wherein energizing the electromagnet to repel the first piston means energizing the electromagnet using a current flow that reverses the polarity of the electromagnet as compared to the current flow used to energize the electromagnet to magnetically couple to the first piston.