An artificial heart is a prosthetic device that is implanted into the body to replace the biological heart. It is distinct from a cardiopulmonary bypass machine (CPB), which is an external device used to provide the functions of both the heart and the lungs. The CPB oxygenates the blood, and therefore does not need to be connected to both blood circuits. Also, a CPB is suitable only for a few hours use, while artificial hearts have been used for periods longer than a year (as of 2007).
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