A leg prosthesis (. Kinds of prostheses) consists of three main parts: interface components cover types of prostheses. Interface between the residual limb and prosthetic The prosthesis is attached to the body with the interface, which consists of a shank and a rigid frame. With the prosthesis stem, which is made of plastic or composite material, the components are mounted on humans. The frame is made of graphite or similar materials, provides structural support for the stem. For shock absorption and for improving the fit of an insert between the residual limb (Stumpf) and the shaft is supported. This insert is made of soft polyurethane or silicone, is adhered to the skin, without causing friction. Ideally, patients should always have two inserts for each prosthesis are available. These deposits should be changed every day. This can be obtained for more elasticity, their life and their shape. In addition or as a replacement, a prosthetic sock can be worn. These stockings are made from wool, nylon, or synthetic materials, sometimes with a gel insert between the fabric layers. They are available in various thicknesses (layers) are available. By wearing several socks of different thickness, the patient can improve the fit, since the remaining limb varies in size as it normally does during the day when activities, weather and other factors change. Some interface have a suspension system that ensures a perfect fit. The following suspension systems are often used: the suction valve: When the remaining limb is placed in the shaft, air is forced through an opening at the bottom of the shaft. A one-way suction valve on the shaft closes the opening and forms a seal which holds the prosthesis in place. Deposits with a safety pin: Most deposits are held on the shaft by means of a grooved pin. Since this pin presses firmly to the remaining limb, the locations of the limb, which are directly touched can react irritated and ignite. Fluid can leak and cause sores. Belts and straps: Sometimes, the prosthesis is attached with a belt or a strap. These devices can be used when securing the prosthesis with a suction valve or a safety pin is difficult or the pin will not be tolerated. However, the belt is relatively rigid and can therefore be inconvenient to attach and cumbersome. In addition, it may also restrict the freedom of movement. Components of a leg prosthesis to the components of a prosthesis include the devices (artificial fingers, hands, feet and toes), joints (wrists, elbows, hips and knees). Metal stems and customized carbon fiber structures that function as bones are used when extra strength, flexibility and energy return are required. For more advanced prostheses are controls available that allow the user to move the prosthesis mechanically or electrically. Components for upper extremity prosthetics, which are controlled by microprocessors and driven myoelectrically have, now more and more replace the older hydraulic, driven body models. Myoelectric prostheses provide a movement driven by the electrical charges that arise naturally when a muscle is contracted. These electric charges are picked up by electrodes on the Oberfläache and then passed to an electric motor that moves the limb. Components for microprocessor-controlled prosthetic lower limb use speed, torque and position sensors to help to define the function. These newer components are more efficient and require less effort to control the prosthesis. The neural-integrated prosthetics, which is now being tested in research for the prosthetics of the upper extremities, can still allow better movement. The nerves that led to the amputated limb are diverted it to come up with healthy muscles to connect (eg. As the pectoral muscle in an amputated arm). These nerves transmit the impulses that once went through electrodes on the skin surface to the amputated limb to the microprocessors in the prosthesis; In this way, the user can move his prosthesis as a natural part of the body. Prosthetic cover Some denture wearers choose a cover that closes around the prosthesis from the outside. Covers may be made of molded foam by the prosthetist, the looks like the missing link. The foam is often surrounded by a realistic case. How lifelike the shells look like will depend on whether they are custom-made or off the shelf. In the custom-made and the exact skin color is determined in the smallest detail. Some users-especially athletes during Wettkampfs- omit the envelope, so that the components are visible.


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