1. A device for heart ventricle (11), installed in the cavity (2) of the heart ventricle, having a volume in which blood flows, which is delimited by walls (8) and has a larger longitudinal dimension (D1) and a smaller transverse dimension (D2), characterized in that it comprises diaphragm means (16) which can be fitted inside said cavity (2) ventricular essentially transversely to said greater longitudinal direction (D1), to reduce said volume, wherein the diaphragm (16), said means has a peripheral edge (15 ), Which can enter the sealed engagement with said walls (8), and moving alternately between active shift for blood ejection and inactive sdvigom.2 reflux. The apparatus according to claim 1, characterized in that each of said active and inactive shear shear substantially synchronized respectively with the systole and diastole of the heart (1) .3. The apparatus according to claim 1, characterized in that said diaphragm means (16) are utilized movably driving means (18, 19) .4. The apparatus according to claim 1, characterized in that said diaphragm means (16) movably pushes said walls are utilized during said systole and diastoly.5. The apparatus according to claim 1, characterized in that said diaphragm means comprise: - a flat member (16) provided with said peripheral edge (15), alternately moving between a position for pushing and return position, - a support frame (13, 22) of said flat element (16) which moves between said eject position and the return position with said plate member (16) .6. The apparatus according to claim 5, characterized in that said1. Устройство для желудочка сердца (11), устанавливаемое в полость (2) желудочка сердца, имеющую объем, в котором протекает кровь, которая ограничена стенками (8) и имеет больший продольный размер (D1) и меньший поперечный размер (D2), отличающееся тем, что оно включает средства диафрагмы (16), которое может быть установлено внутри упомянутой полости (2) желудочка в сущности поперечно упомянутому большему п
