<unk>  can roughly be categorized into groups by application: Sensory and neurological Sensory and neurological<unk>  are used for disorders affecting the major senses and the brain, as well as other neurological disorders. They are predominately used in the treatment of conditions such as cataract, glaucoma, keratoconus, and other visual impairments; otosclerosis and other hearing loss issues, as well as middle ear diseases such as otitis media; and neurological diseases such as epilepsy, Parkinson's disease, and treatment-resistant depression. Examples include the intraocular lens, intrastromal corneal ring segment, cochlear<unk>  tympanostomy tube, and neurostimulator. Cardiovascular Cardiovascular medical devices are<unk> d in cases where the heart, its valves, and the rest of the circulatory system is in disorder. They are used to treat conditions such as heart failure, cardiac arrhythmia, ventricular tachycardia, valvular heart disease, angina pectoris, and atherosclerosis. Examples include the artificial heart, artificial heart valve,<unk> ble cardioverter-defibrillator, cardiac pacemaker, and coronary stent. Orthopedic Orthopaedic<unk>  help alleviate issues with the bones and joints of the body. They're used to treat bone fractures, osteoarthritis, scoliosis, spinal stenosis, and chronic pain. Examples include a wide variety of pins, rods, screws, and plates used to anchor fractured bones while they heal. Metallic glasses based on magnesium with zinc and calcium addition are tested as the potential metallic biomaterials for biodegradable medical<unk> . Patient with orthopaedic<unk>  sometimes need to be put under magnetic resonance imaging (MRI) machine for detailed musculoskeletal study. Therefore, concerns have been raised regarding the loosening and migration of<unk>  heating of the<unk> metal which could cause thermal damage to surrounding tissues, and distortion of the MRI scan that affects the imaging results. A study of orthopaedic<unk>  in 2005 has shown that majority of the orthopaedic<unk>  does not react with magnetic fields under the 1.0 Tesla MRI scanning machine with the exception of external fixator clamps. However, at 7.0 Tesla, several orthopaedic<unk>  would show significant interaction with the MRI magnetic fields, such as heel and fibular<unk>  Electric Electrical<unk>  are being used to relieve pain and suffering from rheumatoid arthritis. The electric<unk> is embedded in the neck of patients with rheumatoid arthritics, the<unk> sends electrical signals to electrodes in the vagus nerve. The application of this device is being tested an alternative to medicating sufferers of rheumatoid arthritis for their lifetime. Contraception Contraceptive<unk>  are primarily used to prevent unintended pregnancy and treat conditions such as non-pathological forms of menorrhagia. Examples include copper- and hormone-based intrauterine devices. Cosmetic Cosmetic<unk>  — often prosthetics — attempt to bring some portion of the body back to an acceptable aesthetic norm. They are used as a follow-up to mastectomy due to breast cancer, for correcting some forms of disfigurement, and modifying aspects of the body (as in buttock augmentation and chin augmentation). Examples include the breast<unk>  nose prosthesis, ocular prosthesis, and injectable filler. Other organs and systems AMS 800 and ZSI 375 artificial urinary sphinctersOther types of organ dysfunction can occur in the systems of the body, including the gastrointestinal, respiratory, and urological systems.<unk>  are used in those and other locations to treat conditions such as gastroesophageal reflux disease, gastroparesis, respiratory failure, sleep apnea, urinary and fecal incontinence, and erectile dysfunction. Examples include the LINX,<unk> ble gastric stimulator, diaphragmatic/phrenic nerve stimulator, neurostimulator, surgical mesh, artificial urinary sphincter and penile<unk>
Implant 
Injection 
Paper cut
Subcutaneous implant
Myfreeimplants
Implantation 
Cryonics
Adjuvant