Through collaboration with a team of multidisciplinary individuals over a 24-hour period at the Victoria Health and Regenerative Medicine Hackathon in Victoria, BC, this attachment was designed and prototyped to allow children with prosthetic hands to comfortably hold and utilize writing implements.
This model is designed for use with the children's prosthetic right hand created by the Victoria Hand Project: https://www.victoriahand.com/. For left-handed applications, simply mirror the model in your slicing software.
You will require the following fasteners:
3 - M3 Hex Nut
2 - M3x10mm Socket Cap Screw OR Thumb Screw
1 - M3x16mm Socket Cap Screw OR Thumb Screw
1) Press the M3 nuts into the provided rectangular slots. Fitment may be tight if your printer is not well-calibrated.
2) Loosely thread the two M3x10mm bolts through the M3 nuts in the finger slot, and loosely thread the single M3x16mm bolt into the M3 nut into the hexagonal pen slot.
3) Insert your desired writing implement into the hexagonal pen slot and hand tighten the bolt. The 20mm slot should firmly accommodate any size of pen, pencil, or marker up to the size of a standard Sharpie.
4) Insert index and middle finger of prosthesis, and hand-tighten the associated bolts until attachment is held firmly. Implement can now be controlled by movement of the hand, with no flexion or wrist rotation required.