Patent ID: 8870738

Claim:
A cardiac function variation evaluation apparatus comprising: a power-consuming continuous-flow auxiliary artificial heart of the bypass type connectable to a left ventricle; a pressure sensor also connectable to the left ventricle for detecting ventricle internal pressure; means for detecting power consumption of the auxiliary heart by multiplying a current wave of the motor and voltage of the motor; and means for calculating the contractile variation of the left ventricle to which the auxiliary artificial heart is connectable by continuously monitoring the variation of the closed loop internal area of a relationship between the ventricle internal pressure detected by the pressure sensor and the detected power consumption of the auxiliary artificial heart, and basing the calculation also on a correlation between the internal area of a closed loop of the relationship and an external work capable of circulating blood through a whole body including the left ventricle and the auxiliary artificial heart, the correlation being high in a full bypass state in which the heart is weak and the aortic valve is not open and being worse in a partial bypass state in which the heart recovers and an aortic valve is open.