Prosthetic  Foot  Normaly  Model 

(1) SACH foot

Sach foot are fixed ankle and soft heel feet, which are lighter in weight, and can also get good results when used in calf prostheses. When used for thigh prostheses, it is only suitable for patients who walk on flat ground or patients in areas with relatively simple terrain. Its ankle and midfoot are composed of an inner wood core, and the outside is covered with foam and made into a foot shape. Its heel is equipped with a soft plastic foam wedge, which is also a soft heel. When the heel touches the ground, the soft heel deforms under pressure, and then the sole touches the ground, similar to the plantar flexion of the foot. When the prosthetic foot continues to roll forward, the movement of the forefoot part of the foam shell is similar to the extension of the toes. The movement of the prosthetic foot in the sagittal plane is realized by the elastic material on the foot.

(2) Energy storage foot

The energy-storing foot is developed on a fixed ankle soft heel foot with a simple structure and light weight. It has been further improved in structure. Increased foot mobility in all directions. It stores energy during the support period and releases it when kicking back. The energy release rate is related to the structure of the foot and the energy storage materials used. This kind of prosthetic foot is designed for sports such as running and jumping, and is suitable for patients with large mobility.

3) Single axis foot

The uniaxial foot has a joint axis related to the human ankle joint. The foot can perform dorsiflexion and plantarflexion movements around this axis. The structure of the foot also determines that it can only move in the sagittal plane. The range of motion and damping of the dorsiflexion and plantar flexion of the uniaxial foot can be adjusted by the buffer devices located in front and behind the shaft. They also affect the stability of the knee joint. The disadvantage of this kind of foot is its heavy weight, long-term use or use in poor conditions, and joint wear and tear.