Myoelectric Hands

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How Prosthetic Hands Work

Prosthesis is the process in which artificial devices are made to replace a missing or impaired body part. Prosthetic hands are made to appear as the same size of a hand, and can replace the function of a hand. A prosthetic hand falls under one of the 4 different types of prostheses, trans-radial. Trans-radial is a prosthesis type for anything needed below the elbow. Many types of prosthetic hand designs have limited usability but technology and its advancement has made functions like being able to grip and hold possible. A lot of daily functions like being able to holding pens, cups, and moving in the same manner a human hand would have been able to be recreated with prosthetics. With the different prosthetics and materials available, people are able to adapt to their lives much more easily.

The materials used for each of these prostheses differ from person to person. Plastic polymer laminates can be used if strength and stiffness in the material is needed, but may be uncomfortable due to some tightness. Textiles can be used to create thin and lightweight prostheses with fabrics including carbon fiber, fiberglass, nylon, Dacron and Kevlar.

There are few types of solutions for this specific prosthetic, one of which being a simple artificial hand called static prostheses, which has been around for years. This prosthetic cannot be controlled by any user, and is most likely to have no function. Its purpose is to help with the overall appearance of a person and help build their self-confidence. There are static prosthetics that when made, can hook up to a person's shoulder and allows the person to at least be able to grasp certain objects. The design is very simple, but they have close to no functionality at all. People may choose to opt for a better prosthetic type if it is within their budget because without good hand-eye coordination, they seem to just get in the way.

Relative to static types, are passive types. A passive prosthetics is realistic in how they look and they are somewhat functional. They are made when a person is feeling unsure about their appearance and the weight of the prosthetic. They are made from a light and flexible skin-like mold, with a metal skeleton underneath. Passive prosthetics is a more realistic option when it comes to affordability. The more natural a hand looks, the more money it will cost. These prostheses are a good option for those who want something semi-realistic with some functionality.

Another prosthetic type functions with myoelectricity. A myoelectric prosthetic is much more sophisticated than static prosthetics, are battery operated and works by using voluntary muscles made by the person. There are sensors within the artificial arm or hand that can detect transmitted electricity from the nerve and muscle systems in a human body. There are more advanced dynamic technologies in which signals received by the prosthetic can detect hot or cold temperatures and transmit it back to the person, making the responses seem very natural. It takes these signals and sends the information back to the person via their electrodes, and pass the sensing of temperature to their central nervous system.

The materials that are used for each of these prosthetic types are usually very lightweight, to help make them easier to have at all times and support. Prostheses are evaluated by specialists and doctors, and are made with careful consideration to help serve each person individually as best as possible.

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Powered Upper Limb Prostheses: Control, Implementation and Clinical Application Sale Price: $313.45 See Reviews For This Product Description Powered Upper Limb Prostheses deals with the concept, implementation and clinical application of utilizing inherent electrical signals within normally innervated residual muscles under voluntary control of an upper limb amputee, amplifying these signals by battery-powered electrical means to make a terminal device, the prosthetic hand, move to perform intended function. The reader is introduced to various facets of upper limb amputations and their clinical management in both children and adults. The authors from Canada, USA and Great Britain are well known practicioners, academics and researchers in the field. The book has over 130 illustrations and contains an extensive bibliography.