a drug (such as a subcutaneous hormone implant), a prosthesis (such as an artificial hip, an intraocular lens implant (see cataract), a breast implant, a cochlear implant, or an artificial heart implant), or a radioactive source (such as radium needles) that is put into the body, a medical device manufactured to replace a missing biological structure, support a damaged biological structure, or enhance an existing biological structure, something (as a graft, a small container of radioactive material for treatment of cancer, or a pellet containing hormones to be gradually absorbed) that is implanted especially in tissue, koe sisse istutatud võõrkeha või aine, tehiselund organismis