NIOP Helix Cuff

thingiverse

This cuff is part of the NIOP prosthetic modular arm catalog, designed for transhumeral (above-elbow) amputees and individuals with limb difference. The four screw holes around the base align with the screw pattern on the Top Plate from the NIOP Shelbow module https://www.thingiverse.com/thing:3639811. It holds securely without excessive constricting pressure, allowing blood to circulate freely due to the vertical supports. Compared to fitted sockets, it is also well ventilated. The socket is removable for easy cleaning and can be thermoformed again to adjust the fit as the stump shrinks. The helix shape of the lacing constricts and compacts the arm in two directions, providing a secure grip without slipping. For added grip, Dysem non-slip material can be applied inside the cuff to prevent slippage even when wet or sweaty. The Helix Cuff is adjustable, allowing it to be worn shortly after surgery (2-3 weeks), once the incision has healed. This provides post-op amputees with an option for a prosthetic while their stump shrinks to be fitted for a professional socket. The cuff tension can also be adjusted using the screw tensioner on the side. Once the tension is set, the latch allows the wearer to easily take the device on and off, and it can also be operated with a device hand or hook for bilateral recipients. It is strongly recommended that you consult a professional prosthetist for guidance before using this device. Improperly fitted devices can cause permanent damage to the wearer, so seek professional advice. If you cannot afford to see a doctor or live in an area where they are unavailable, visit enablingthefuture.org to find a volunteer prosthetist who can help. OpenSCAD file for sizing the device is coming soon! Temporary Sizing Method - The 100% cuff size is based on a circumference of 251mm around the upper arm, just above the elbow. To figure your print scale, divide your arm circumference (in mm) by 251. The resulting number is your scale factor to use in your slicer. These STLs are made for a left-arm device. The Cuff and Switch parts should be mirrored for right-arm devices. Assembly Instructions can be found at https://docs.google.com/document/d/1kR8iDFakDri9m0ofV-qOC2av1DCpggQVqH7sowBG928/edit. Links for Materials are available at https://docs.google.com/document/d/1_i3BSe7nnHnZhTax_osXeQR7MjQyPMPcE9OXrI1mpeA/edit.