Abstract: An inflow conduit of a ventricular assist device configured to prevent formation of recirculation and stagnation zones as well as collapse due to external forces or pump induced suction can be rigid and have a funnel like shape with an elbow to accommodate a patient anatomy. Stiffening elements and pressure sensing devices can also be provided associated with the inflow conduit.

Abstract: A pump includes a flexible conduit, at least one valve attached to the flexible conduit about the perimeter of the valve; and a drive mechanism to move the valve to pump blood within the conduit. The drive mechanism can, for example, be adapted to complete a single stroke during each heart ventricle contraction and/or to complete multiple strokes (that is, oscillate) during a single contraction. Another implantable pump for assisting blood flow, includes: a flexible conduit formed in an arc; at least one movable valve in operative connection with the conduit; and a drive mechanism to move the valve in an arced path to pump blood within the conduit. Another pump includes a conduit and at least one moveable valve within the conduit. The moveable valve includes a plurality of openings. Each of the plurality of openings has a closure mechanism in operative connection therewith.