A circulatory assistance device for implantation in the human body to assist a failing heart. The device comprises a truncated conical structure, made up of rigid pieces connected by volumetric reduction columns which contain electromechanical means for exerting alternating stress and mechanical means for maintaining the stress. On the inside of the structure are positioned sacs belonging to a double, right and left, hydraulic drive unit comprising pumping means. The truncated conical structure further comprises fastenings for securing the structure in implanted relation in a human body. The structure is connected, by a multiconductor cable to an implantable electric power source and to electronic control means which govern the functioning chronology of the alternating stress and of the double hydraulic drive unit.
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