Conceptual Design of Bionic Foot for Transtibial Prosthesis

The main way to restore limb function in transtibial amputations is to use a transtibial prosthesis. Plantarflexion and dorsiflexion are characteristics of the human ankle and are also important considerations in designing a transtibial prosthesis. Most commercial transtibial prostheses available in Indonesia are passive transtibial prostheses, and users of passive prostheses exhibit an asymmetrical gait pattern that can cause musculoskeletal injuries. In addition, passive prostheses cannot generate thrust like the human ankle and consume more metabolic energy, so they tire quickly when using them. Transtibial Bionic Prosthesis can overcome the weakness of passive prosthesis because it can move in dorsiflexion and plantarflexion and can provide repulsion force during the heel-off and toe-off phases. This study aims to design and analyze the strength of the Transtibial Bionic Prosthesis prototype, morphological methods and decision matrices are used in the selection of design concepts. Lightweight aluminum 6061 was used as a material for making transtibial prostheses. The design and strength analysis in this study showed that the Transtibial Bionic Prosthesis prototype was able to accept a maximum load of 100 kg and had a Range of Motion of 20° dorsiflexion and 30° plantarflexion.