The length of the forearm stump determines the prosthetic hand

The prosthetic hand can be divided into decorative hand, cable control hand, hook hand, tool hand, electric hand and myoelectric hand.
 
Decorative prosthetic hands, also known as cosmetic hands, are designed to compensate for physical defects and balance the body.
 
Cable control hand, also called functional hand or manipulator, is a kind of common hand with the shape and basic functions of the hand.
The prosthetic hand is controlled by pulling a traction lock through the movement of the amputation's own joints.
 
The hook - shaped prosthetic hand is different from the cable - controlled hand in that it does not have the shape of a human hand, but is separable hook - shaped and has better fetching function.
 
The tool hand is specially designed and assembled for professional work. Amputees can use various special tools according to their needs.
 
The electric prosthetic hand is powered by a high-efficiency rechargeable nickel-cadmium battery and driven by a miniature DC motor to open and close the prosthetic hand through mechanical deceleration.
 
Electromyographic prosthetic hand, also known as bioelectric prosthetic hand, uses the electromyographic signal generated during muscle contraction of the stump, which is elicited by skin electrode and amplified by bioelectric amplifier to control the operation of a miniature DC motor to drive the opening and closing of the prosthetic hand.
 
For forearm amputees, the above prosthetic hands can be installed, but because of the length of the forearm stump, there are some differences in function.
Compared with the forearm prosthesis, the upper arm prosthesis adds elbow joint. There are also decorative upper arm prosthesis, locking upper arm prosthesis and electric prosthesis.
 

The lower limb prosthesis mostly adopts skeletal structure

Lower limb prosthesis can be divided into leg prosthesis and thigh prosthesis.

Modern leg prosthesis receiving cavity and residual limb bearing uniform, comfortable to wear.

The suspension of prosthesis relies on the upper edge of the outer and inner side of the stump to hold the widest part of the inner and outer side of the knee or the knee cap to hold the suspension.

The leg part is generally bone type, with foam foam sponge and skin color socks. It has a good appearance and is easy to adjust the line.

Amputees can choose fixed ankle soft foot, uniaxial foot, universal foot and energy storage foot according to their own needs.

The modern leg prosthesis is usually equipped with one-way ventilation valve under the receiving cavity. When the prosthesis is bearing, the air at the end of the stump is squeezed and excluded.

When lifting the prosthesis, the prosthesis is attached to the stump, so it is called suction thigh prosthesis.

If the stump is shorter, the prosthesis may need to be suspended with an additional lumbar sling or hip hinge belt.

Knee joint is divided into knee joint with hand lock, knee hinge with load bearing self-locking structure and pneumatic knee joint.

Big crus uses skeleton type structure more.

Prosthetics must be individually designed and manufactured according to the specific needs of each patient.

This requires that prosthesis engineers must be engineers and technicians with extensive knowledge in materials, machinery, electronics and other processes, have a full understanding of obstacles and injuries that cause obstacles, and have knowledge in anatomy, physiology, kinematics and clinical medicine.

Accordingly, install prosthesis must ask professional personnel to make.