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Design and evaluation of two different finger concepts for body-powered prosthetic hand

This study aims to find an efficient energy transmission method for body-powered prosthetic hands. Two different finger concepts - pulley-cable finger and hydraulic cylinder finger - were designed and tested. The results showed that the hydraulic cylinder transmission was more efficient in delivering pinch force with less input energy, especially for tasks requiring higher pinch forces.

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Design and evaluation of two different finger concepts for body-powered prosthetic hand

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  1. Design and evaluation of two different finger concepts for body-powered prosthetic hand Gerwin Smit, MSc, PhD; Dick H. Plettenburg, MSc, PhD;Frans C. T. van der Helm, MSc, PhD

  2. Aim • Find efficient energy transmission method for body-powered prosthetic hand. • Relevance • Mechanisms in prosthetic hands should have low mass and be able to deliver pinch force with only small amount of input energy.

  3. Method • Designed and tested pulley-cable finger and hydraulic cylinder finger. • Compared pulley-cable transmission principle with hydraulic cylinder transmission principle. • Both fingers had identical dimensions and low mass. • Measured input energy for several tasks. (b) (a) Figure. (a) Pulley-cable finger.(b) Hydraulic cylinder finger.

  4. Results • Pulley-cable finger required more input energy than hydraulic cylinder finger to perform tasks, especially tasks requiring higher pinch forces.

  5. Conclusion • Hydraulic cylinder transmission is more efficient transmission for application in body-powered prosthetic fingers.

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