Prostheses



In medicine, a prosthesis is an artificial extension that replaces a missing body part. It is part of the field of biomechatronics, the science of fusing mechanical devices with human muscle, skeleton, and nervous systems to assist or enchance motor control lost by trauma, disease, or defect. Prostheses are typically used to replace parts lost by injury (traumatic) or missing from birth (congenital) or to supplement defective body parts. In addition to the standard artificial limb for every-day use, many amputees have special limbs and devices to aid in the participation of sports and recreational activities.

Components
In order for a prosthetic limb to work, it must have several components to integrate it into the body's function:

Biosensors detect signals from the users nervous or muscular systems. It then relays this information to a controller located inside the device, and processes feedback from the limb and actuator (e.g., position, force) and sends it to the controller. Examples include wires that detect electrical activity on the skin, needle electrodes implanted in muscle, or solid-state electrode arrays with nerves growing through them.

Mechanical sensors process aspects affecting the device (e.g., limb position, applied force, load) and relay this information to the biosensor or controller. Examples: force meters and accelerometers.

The controller is connected to the user's nerve and muscular systems and the device itself. It sends intention commands from the user to the actuators of the device, and interprets feedback from the mechanical and biosensors to the user. The controller is also responsible for the monitoring and control of the movements of the device.

An actuator mimics the actions of a muscle in producing force and movement. Examples include a motor that aids or replaces original muscle tissue.

Cosmesis
Though many prosthetics are clearly made of artificial materials, the practice of cosmesis, the creation of life-like limbs made from silicone or PVC, has grown in popularity. Such prosthetics, such as artificial hands, can now be made to mimic the appearance of real hands, complete with freckles, veins, hair, fingerprints and even tattoos. Custom-made cosmeses are generally more expensive (generally costing several thousand dollars, depending on the level of detail), while standard cosmeses come ready-made in various sizes, though they are often not as realistic as their custom-made counterparts. Another option is the custom-made silicone cover, which can be made to match a person's skin tone but not details such as freckles or wrinkles. Cosmeses are attached to the body in any number of ways, using an adhesive, suction, form-fitting, stretchable skin, or a skin sleeve.

Prosthetic Enhancement
Within science fiction, and, more recently, within the scientific community, there has been consideration given to using advanced prostheses to replace healthy body parts with artificial mechanisms and systems to improve function. Although no such "enhancement prosthetics" have yet been created and demonstrated to work for healthy individuals, the morality and desirability of such technologies is debated. Body parts such as legs, arms, hands, feet, and most other body parts can be replaced.

Types
Some types of prosthetics include:
 * Artificial limbs
 * Breast prosthesis (after mastectomy)
 * Cochlear implants
 * Corrective lenses
 * Craniofacial prosthesis
 * Dental / Maxillofacial prosthetics (in cleft palate, dentures, dental restorations)
 * Facial prosthetics
 * Hair prosthesis
 * Neuroprosthetics
 * Ocular prosthetics
 * Ostomies (colostomy, ileostomy, urostomy)
 * Penile prosthetics
 * Replacement joints (such as hips)
 * Somato prosthetics
 * Prosthetic testis
 * Transtibial prosthesis