Thumb Prosthesis

thingiverse

This is a prosthesis designed specifically for individuals who have lost their entire thumb. The device features an articulated thumb with a silicone tip, connected to the index finger via a wire. As the index finger flexes, it causes the thumb to bend, enabling users to grasp objects of varying diameters and perform precision gripping. The innovative mechanism behind this prosthesis was inspired by the Cyborg Beast design. This project was undertaken in collaboration between the Direction of Innovation and Development and the Neuro Rehabilitation Institute, with a focus on creating a functional prosthetic for individuals in need. A video showcasing the testing of a previous prototype can be viewed at https://youtu.be/vKrV3-DOdA4. **Print Settings** * Printer Brand: Leapfrog * Printer Model: Creatr * Rafts: Yes * Supports: Yes * Resolution: 0.2mm * Infill Percentage: 15% **Notes** It is highly recommended to print Thumb F2 with a layer resolution of 0.1mm for optimal results. **Post-Printing Assembly Instructions** 1. Attach Velcro strips to the outer edges of the palm piece, ensuring a secure fit. 2. Apply a non-slip coating to the inner surface of the palm for added grip. 3. Heat the palm piece and shape it according to your hand using a heat gun or hot water (exercise caution to avoid burns). 4. Apply silicone to the tip of Thumb F1, utilizing a soft, pliable material similar to bathroom sealant. To shape the silicone, use the tip of a glove: cut the glove tip, apply hand cream for lubrication, fill with silicone, and insert the 3D printed piece. 5. Insert the axis (printed or metal bar) between Thumb F1 and Thumb F2 pieces, ensuring proper alignment. Add a torsion spring to the inner surface to maintain thumb extension. 6. Connect the wire through the designated path, securing it in place with a blind knot at both ends to prevent slippage. **Assembly of Index Exoskeleton** 1. Attach the index exoskeleton, incorporating a sponge or soft material for added comfort if needed. 2. Pass the wire through the designated pathway and secure it with a blind knot at both ends.