UPPER LIMB PROSTHETICS-A2. BODY POWERED DEVICES

SUMMARY

1. Prosthetic hands provide a 3-jaw chuck pinch.

2. Hooks provide the equivalent of lateral or tip pinch.

3. Voluntary-opening terminal device: device maintained in closed position by rubber bands or tension springs, the amputee uses cable-control harness powered by proximal muscles to open the terminal devices against the force of the rubber bands or spring.
- The pinch force is determined by the number and type of rubber bands or springs.

4. Voluntary-closing terminal device: more physiological function than VO, device is maintained in an open position and has to be closed voluntarily by pulling with the cable on the harness system to grasp an object.
- The maximum prehensile force is determined by the strength of the individual.
- Disadvantages: prolonged prehension requires constant pull on the harness; the terminal device remains awkwardly open when not in use.

Reference(s)

Cifu, D.X. (2020). Braddom’s physical medicine and rehabilitation. Elsevier. Get it on Amazon.
Cuccurullo, S. (2019). Physical medicine and rehabilitation board review. New York: Demosmedical. Get it on Amazon.
O’Young, B., Young, M.A. and Stiens, S.A. (2008). Physical Medicine and Rehabilitation Secrets. Mosby. Get it on Amazon.