artificial heart

noun
any of various four-chambered devices, modeled on the human heart, that pump blood by attachment to a power source and that are constructed for temporary external use or for implantation as a temporary or permanent heart replacement.
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American Heritage
Medical Dictionary

artificial heart n.
A mechanical pump used to replace the function of a damaged heart, either temporarily or as a permanent internal prosthesis.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
The goal of building a safe artificial heart has frustrated bioengineers for more than four decades.
Doctors yesterday released an x-ray of the first recipient of the first self-contained artificial heart.
Emboli can originate from blood clots that form at the site of artificial heart valves.
Doctors try an unproven artificial heart, but the patient dies.
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