Black Jack 21 - episode 10 - 25 Jun, 2006

Black Jack survives the shooting because his mother's pendant stopped the bullet. He operates on Dr. Bart’s mother, Catherine, and discovers that she has a Type Hydra artificial heart which keeps beating even when it is extracted from the host. Jack replaces the Type Hydra with another artificial heart and saves her life. They discover that the Type Hydra was designed by Jack's father, Hazama Kagemitsu, through a microfiche that was inside Mio's pendant. Catherine tells Jack how his parents met and how Kagemitsu left Mio and the hospital to work on the Noir Project. When Catherine had a heart attack, Kagemitsu risked his life to provide the experimental the artificial heart. Meanwhile, Benitokage steals the Type Hydra and the order to kill Jack is cancelled. (Source: Wikipedia)