Body-powered prostheses are useful tools that can restore the ability to pick up and grasp objects and assist the user's sound hand. Body-powered partial hand devices can help restore function when the finger loss is as the PIP or MCP level. For people with higher amputation levels, movements of the upper arm, shoulder and chest are captured by the harness and cable system, and used to open and close the hook or hand, similar to how a bicycle handbrake system works.
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Movements of the upper arm, shoulder and chest are captured by the harness and cable system, and used to open and close the hook or hand, similar to how a bicycle handbrake system works. As users grow accustomed to the feeling of varying tension on the cable, they may experience an improved sense of the position of the limb and the degree of opening on the terminal device. Hooks can be made of aluminum, steel, or titanium and can be rubber lined for better gripping. The grip force of a voluntary opening hook is determined by the number of rubber bands holding the hook closed.
Many amputees like the durability and basic function of body-powered prostheses and find them particularly useful for working outdoors or in rugged or wet environments. A custom silicone interface can improve user comfort and is available in a wide range of colors.
Myoelectric upper limb technologies use electrical signals generated by muscles in the residual limb to control the movements of a prosthesis. When the user contracts certain muscles, surface electrodes in the socket detect the muscle signals and send them to a controller, which triggers tiny, battery-powered motors to move the fingers, hand, wrist or elbow.
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The advantages of myoelectric prostheses include more intuitive control of the prosthesis, increased grip strength, access to multiple grip patterns and more natural hand movements.
Myoelectric technologies are available for all levels of upper limb loss.
The LUKE arm, by Mobius Bionics, is the most advanced prosthesis on the market and the only commercially-available prosthesis with a powered shoulder (up to 10 powered joints), allowing shoulder-level amputees to reach over their head.
Our Arm Dynamics clinicians conducted one of the first ever civilian test-fittings of the LUKE arm. Our patient, Steve Brown, was amazed by the LUKE arm's intuitive motion-control interface and its unique ability to reach out and grasp things above the shoulder. According to Steve, the Luke Arm, ''will be life changing for the future of those with upper limb loss.'
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