Design optimization of a pedaling mechanism for paraplegics

The design optimization of a pedaling mechanism for use by paraplegic persons through functional electric stimulation of paralyzed muscles is described. The objective of the optimization is to enable paraplegics to pedal by use of the limited number of leg muscles accessible to surface stimulation. This is obtained by optimization of a four-bar pedaling mechanism with no “dead points”. As a beneficial side effect of the optimization, an indication of the best stimulation pattern for the muscles is obtained. A prototype of the mechanism is built, and its attractive behavior is explained. It is concluded that the mechanism has indisputable advantages compared with conventional cranks. The next step will be experimental verification with fit people and subsequently with paraplegics.

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