Medical device

摘要

A temporary cardiac-assist device is disclosed. The device includes a pump assembly that is deployed in the ascending aorta or the heart. A torque transmission line couples the pump assembly to an external motor for driving impeller blades within the pump assembly. The pump assembly expands in size at its destination site for operation. In operation, neither the torque transmission line nor elements that support the impeller blades are under axial forces.

主权项

1. A temporary cardiac-assist device having a pump assembly that is physically adapted to be driven by a torque transmission line, wherein the pump assembly comprises:
a drive shaft, wherein the drive shaft is a distal portion of the torque transmission line; a proximal support housing, wherein the drive shaft passes through the support housing, and wherein the support housing does not rotate; an impeller hub, wherein the impeller hub is distal to and axially aligned with the support housing and is operatively coupled to the drive shaft, wherein no portion of the torque transmission line extends beyond the impeller hub; an impeller blade that depends from the impeller hub; a casing for enclosing the impeller blade, wherein the casing has an expanded state and a collapsed state; a distal support, wherein distal support is distal to, coupled to, and axially aligned with the impeller hub, and wherein the distal support is not subjected to an axial load when the casing reconfigures from the collapsed state to the expanded state.