#implant  a prosthesis placed permanently in tissue
  supertype:  prosthesis__prosthetic_device  corrective consisting of a replacement for a part of the body
  subtype:  artificial_heart  a pump that replaces the natural heart
     subtype:  Jarvik_heart__Jarvik_artificial_heart  a kind of artificial heart that has been used with some success
  subtype:  artificial_joint  an metal or plastic part that is surgically implanted to replace a natural joint (possibly elbow or wrist but usually hip or knee)
  subtype:  breast_implant  an implant for cosmetic purposes to replace a breast that has been surgically removed
  subtype:  dental_implant  an implant that replaces a natural tooth
  subtype:  heart_valve  an implant that replaces a natural heart valve
  subtype:  lens_implant  a clear plastic lens implanted in the eye; usually done when the natural lens has been removed in a cataract operation
  subtype:  penile_implant  an implant that creates an artificial erection
  subtype:  shunt.implant  implant consisting of a tube made of plastic or rubber; for draining fluids within the body

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