Patent ID: 7740575

Claim:
In a fluid pressure generating device for a heart assist device having a blood pumping means, the improvement comprising: a housing defining an interior volume, and having a substantially rigid first housing portion, a substantially rigid second housing portion, a flexible third housing portion extending between the first and second housing portions and an inlet/outlet port connected to one of said housings and adapted to place the interior volume of the housing in fluid communication with the blood pumping means, wherein the third housing has an outer surface about its periphery, an inner surface facing into the interior of the housing and is joined along an edge to the first housing portion; a liquid fluid for driving the blood pumping means filling the interior volume of the housing; and a motor disposed within the interior volume of the housing and immersed within the fluid for driving the blood pumping means, the motor being connected between the first and second housing portions, wherein actuation of the motor moves the first and second housing portions relative to one another to generate fluid pressure changes at the inlet/outlet port, wherein a positive pressure change causes inflation of the blood pumping means and a negative pressure change causes deflation of the blood pumping means.