Ryan Bao - Prosthetics Project

Prosthetics Project

The goal of this project is to build a low-cost, 3D printable, self-reparable prosthetic hand. We are attempting to use compliant mechanisms to make the hand as 3D printable as possible, and are experimenting with various types of compliant mechanisms and materials to accomplish this.

Version 0: Proof of Concept

This version was built with a spring, a servo and a cord, but all other parts are 3D printable. We noticed that this mechanism would deform in unexpected ways, however, so we moved to compliant mechanisms.

Version 0.5: Compliant Mechanism 1

This version was designed to a proof-of-concept level. A final design would have the curved fingertip attached to the left side of the mechanism. However, we noticed that the compliant mechanism was too thin to be used with PLA, and would just snap. We are planning on experimenting with ABS or a more flexible filament.

PXL_20220123_210712078.mp4

Version 1: Compliant Mechanism

This version was our first functional model. It flexes as expected and returns to its original position when the servo-driven winch retracts. We are still looking at the potential mechanical degredation that comes with continuous use of this mechanism.

Full Hand

We were able to build a full prosthetic hand with full actuation of all fingers and program it to perform simple functions, like gripping known objects.

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