Phantom Pain Functional Prosthetic Hand

thingiverse

Several months ago, I was approached with a unique commission - to create a functional prosthetic hand based on the Phantom Pain hand from Metal Gear Solid 5. The client, born without a left hand, had grown tired of his standard claw-style prosthetic and wanted something more durable and useful on a budget. He didn't want to shell out thousands of dollars for a motorized medical-grade prosthetic. My goal was to create something that met these requirements. The challenge lay in the fact that my client had very little left of his wrist, which meant the standard active grip system wouldn't work for him. I designed a passive grip system using retention springs, allowing the fingers to auto-adjust to whatever object they were gripping. The user only needed to input to open the grip, done by pulling the knob at the rear of the forearm section. All 5 fingers normally opened and closed at once, but there was also a detachable ring connected to the main knob that articulated just the index finger. This could be locked in place for greater usability in actions such as typing and pressing buttons. I'm releasing these files for free because I want them to reach people who need a prosthetic and can use them to improve their lives. The total material cost for the final device is under $100. Here's a breakdown of the additional parts you'll need: Order these: * 14x Low profile 4-40 Locknuts: https://www.mcmaster.com/#catalog/122/3213/=15s86hk * 50x 4-40 7/8" screws: https://www.mcmaster.com/#catalog/122/3018/=15s87ym * 20X 4-40 5/8" screws; https://www.mcmaster.com/#catalog/122/3018/=15s89ba * 14x Torsion springs (option to use stronger springs for increased grip strength, I used 0.353 OD 270 degree right hand torsion); https://www.mcmaster.com/#catalog/123/1293/=1ayad1u * 10 feet of 1.2mm stainless steel braided cable; https://www.amazon.com/gp/product/B00GYTWM4I/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1 Normal hardware store stuff: * 1x 6-32 Locknut * 2x 6-32 40mm screws * 2x 6-32 15mm screws * 12x 13mm rubber grip pads * 7 10mm rubber strip grip pads * Super Glue (for holding the pads in place) * Epoxy putty (For filling the connection between the cables to the pull knob) * Preferred type of foam for internal padding (high density open-cell foam recommended) Assembly is straightforward, with all parts pressing fit together and then screwed into place with the appropriate size/length screw as listed above. The springs are slotted into the appropriate ends of each finger joint before they're put together. The steel wire must be knotted at one end, and then slid through the holes of the fingers to the back of the wrist starting at the finger tip. Please don't hesitate to ask any questions or request modifications. I've posted all step files for your convenience. Feel free to modify them however you please and post remixes for the community to benefit from! Print Settings: * Printer: Flash Forge Creator Pro * Rafts: No * Supports: Yes * Resolution: 0.200 microns for most parts * Infill: 40%