How do Artificial Limbs Work?

Myoelectrically controlled prostheses can receive bioelectrical signals from the brain through the residual muscles of the limbs, and are processed by electronic and mechanical systems installed in the prosthetic arm barrel to generate actions. The sensors in the prosthesis can then feed back the generated pulse signals back to the brain.

Myoelectric prosthesis

Right!

Myoelectrically controlled prostheses can receive bioelectrical signals from the brain through the residual muscles of the limbs, and are processed by electronic and mechanical systems installed in the prosthetic arm barrel to generate actions. Then, the

EMG prosthetics are divided into forearm prostheses and

When a patient's residual limb muscles contract, a complex biochemical reaction occurs, and a small potential difference that can be measured is generated on the skin surface. This myoelectric potential difference signal is transmitted to the microsensor and amplified by the amplifier in the electrode to become a control. The signal is input into the microcomputer, and then the microcomputer sends out movement instructions to drive the prosthetic phalanx joints to expand through a driving system such as a micromotor.

The key to assembling an electronic hand is to find the strongest electromyographic voltage signal when the forearm amputee accommodates the extensor and flexor muscles and the upper arm amputee contracts the biceps and triceps from the surface of the skin of the residual limb. And measure the voltage values at these two points, and then reasonably adjust the signal amplification signal of the electrode amplifier, and at the same time, training the residual limbs according to the intention of the activity by using the electromyography training device according to the patient's residual limbs. In order to effectively control and manipulate the articulation of the prosthetic phalangeal joints in different forms of residual limb muscles, the dynamic regulator automatically adjusts the size of the prosthetic hand grip and the speed of opening and closing. Because the electronic hand has extremely high sensitivity, after training, it can make the patient control freely, and assist the good hand to do things that one hand can't accomplish, such as washing the face, wringing towels, dressing, writing, tying shoelaces, and taking a spoon to drink. Soup, etc. If you continue to learn and exercise in your life, you will be able to perform its maximum functions. The electronic hand is equipped with a 180-degree rotation and anti-vibration device, so when riding a motorcycle or doing other activities, no vibration force will be transmitted to the arm, which will cause soreness (as far as I know in China, Delin prosthetics have this function).

There is a permanent non-changeable battery between the prosthetic tube and the palm (built-in battery, external replaceable), and is equipped with a charger. Just take off the charge before going to bed every night. For those who have less exercise, they can charge once. Use 2-3 days, generally can be used for more than one day. The electronic arm of the forearm is an epiphyseal suspension-free prosthetic arm, which is extremely convenient and comfortable for patients to wear. The imported silicone hand skin has a realistic appearance. The electronic arm of the upper arm is also equipped with elbow flexion as the functional arm of the upper arm. The device enables the elbow joint to have flexion and extension functions and can be locked at different flexion and extension angles.