Things that expand the possibilities for active prosthetic arms and amputees are (1) the basic body-powered upper-limb prosthesis, (2) knowledge and technology backed by extensive experience, (3) past knowledge, (4) new products, (5) ideas, and (6) opinions and requests of amputees. Herein, we considered the “hidden” possibilities of the body-powered upper-limb prosthesis through the elbow system prosthetic hand developed in the wake of (6). In addition, in order to expand the possibilities of body-powered upper-limb prostheses and amputees, it is important to create a suitable body-powered upper-limb prosthesis. In the future, a new body-powered upper-limb prosthesis checkout will play this role. The body-powered upper-limb prosthesis created through these processes will become an indispensable upper-limb prosthesis for amputees’ lives, and will further expand its possibilities.
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