Abstract: The implantable heart assist device includes an elongated assembly extending transversely between the ribs of a person from the rib cage to the aorta of the heart to be assisted. The elongated assembly includes an aorta compressing device at the front end thereof for engaging the aorta externally thereof. A mounting device at the rear end of the elongated assembly supports the device from the ribs of the person, and a motive device actuates and deactivates the compressing means alternatingly to help pump blood through the aorta.To implant the heart assist device, a small incision is made at an area between the ribs, and the heart assist device is inserted through the incisional opening between the ribs. The mounting device is then affixed to the rib cage, and the motive device is then activated to cause the aorta compressing device to compress and release the aorta repeatedly.