A biomechanism is a mechanical device that simulates the workings of some part of a living body. Examples of biomechanisms are mechanical hands, arms, and legs, known in the medical field as prostheses. Especially, the term applies to robotic devices that not only perform the functions of their living counterparts, but look like them.

The term biomechanism can also be used in reference to some body function. Thus, one might talk about the structure of a forearm and hand, calling it a biomechanism. The human anatomy has, in fact, proven to be an excellent model for the design of robotic devices.

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