Thumb Prosthesis

by GabrielaB, published

Thumb Prosthesis by GabrielaB Apr 13, 2017
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Thumb Prosthesis by GabrielaB is licensed under the Creative Commons - Attribution license.

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This is a prosthesis for people that has lost his entire thumb. It's a articulated thumb, with silicone tip, connected by a wire to the index finger. When the index flexes, it flex the thumb, this way the person is able to grip things of different diameters and perform tip grip.

The mechanism was inspired in the one used in the Cyborg Beast.

This object was made for the "Mutual de Seguridad C.Ch.C" from Chile. In a project of the Direction of innovation and development, and the Neuro rehabilitation institute.

A video of the prosthesis begin tested (a former prototype) can be found in https://youtu.be/vKrV3-DOdA4

Print Settings

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it's recomended print thumb f2 with layer resolution of 0.1mm


Assembly instructions

  1. Sew velcro to the extremes of the palm piece (you may put them over an elastic band for tighter closure). Also stick an non slip surface in the inner face of the palm.
  2. Heat the palm and shape it with the hand (you may use a heat gun or hot water, be careful to not burn the person)
  3. Add silicone on the tip of the Thumb f1 part. (it’s recommended a soft silicone, like the one used for sealing in the bathroom). For shape the silicone you may use the tip of a glove. Cut it from glove, put hand cream in the inner face, fill it with silicone and introduce the 3D printed piece.
  4. Put the axis (you can printed it or use a metallic bar) between the thumb f1 and the thumb f2 pieces. In the inner add a torsion spring, It will allow that the thumb remain extended. Use the holes in the thumb f1 and f2 parts for hide the coil end. Repeat the same process for the union between thumb f1 and the palm.
  5. Assemble the index exoskeleton, add a sponge or another soft surface if it’s needed.
  6. Pass the wire through the designated path
  7. Tie the thread at its ends. Add a blind knot for avoiding the previous knot slip.

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Beautifully elegant design for creating a mechanical thumb prosthesis. I am currently working with an individual who had his left thumb amputated in a cooking accident. Though his hand is quite a bit bigger and wider than would work for these files. I need to move the thumb attachment more medially within the palm and make the guide path for the wire a bit bigger as well. Is there any way you can upload the .STEP or .IGUS files for the design so that I can make some re-work changes? I will of course share the changes once completed.

I made it on Solidworks, I uploaded a .rar file with all the files needed. If you need any extra help, please feel free to contact me.
Hope you can share your customization and told me how it work :)

Wonderful Gabriela! Thank you very much. This will be a really big help. I will let you know if the files work for me. I normally use Fusion360. I will definitely share the customization with you after I figure it out and fit it to my friend :)

Hey is there any videos of the build??

No, I don't have (Currently I'm not working with 3D printing, so I can't made one). But in "Thing details" your can find the assembling instructions.
If you build my prototype and you can share a building video would be great, or if you made a remix of my design please share it.

If you other question feel free to ask me.