A medical device is disclosed that is adapted to enhance intra-cardiac blood circulation of a heart of a patient by assisting pump action of said heart. The device includes a fixation unit for fixating a mechanical unit of said device to a cardiac valve annulus. The mechanical unit is devised to apply a mechanical supporting force to the valve annulus during at least a portion of systole for augmenting the natural pumping force of the heart, and/or during at least a portion of diastole for augmenting a natural filling of the ventricle of said heart. The fixation unit is for instance at least partly loop shaped and adapted to be affixed to the valve annulus, and wherein said mechanical unit is attached to said fixation unit at a circumference of said fixation unit.
