---  To learn about what each of the above icons represents, please refer to the [Device Ratings Guide](https://hub.e-nable.org/s/e-nable-devices/wiki/page/view?title=Device+Ratings+Guide "Device Ratings Guide"). ---  **Designer:** Nate Munro, Chang Liu, Donna Zimmerman **Description:** This cuff is part of the NIOP prosthetic modular arm catalog, and is used to fit transhumeral (above-elbow) amputees and people with limb difference. The (4) screw holes around the base of the perimeter align with the screw pattern on the Top Plate part from the NIOP Shelbow module [https://www.thingiverse.com/thing:3639811](https://www.thingiverse.com/thing:3639811) It is very effective, so it holds on without much constricting pressure, and the vertical supports allow the blood to still circulate. It also is well ventilated compared to fitted sockets. The socket is removable so it's easy to clean, and can be thermoformed again to adjust the fit as their stump shrinks. The helix shape of the lacing constricts and compacts the arm in two directions, to grip it very securely, without slipping. If desired for extra grip, Dysem non-slip material can be added inside the cuff to eliminate the device from slipping, even when wet or sweaty. The Helix Cuff is adjustable, so it can be worn shortly after surgery (2-3 weeks), once the incision has healed. This gives post-op amputees an option for a prosthetic while their stump shrinks to be fitted for a professional socket. The cuff tension can also be adjusted with the screw tensioner on the side. Once the tension is set, the latch not only allows the wearer to take the device on and off easily, but it can also be operated with a device hand or hook, for bilateral recipients. These stl's are made for a Left arm device. The Cuff and Switch parts should be mirrored for Right arm devices. --- # Files and Resources **STL Files:** [https://hub.e-nable.org/s/niop-no-insurance-optimized-prosthetics/cfiles/browse/index?fid=55](https://hub.e-nable.org/s/niop-no-insurance-optimized-prosthetics/cfiles/browse/index?fid=55 "https://hub.e-nable.org/s/niop-no-insurance-optimized-prosthetics/cfiles/browse/index?fid=55") **Source CAD Files:** Coming soon **Instructions:** [https://docs.google.com/presentation/d/1D_EhCSU9I2wyo0c0fPkUlEjhPkfL1ru8MV19u7XfY9Q/edit](https://docs.google.com/presentation/d/1D_EhCSU9I2wyo0c0fPkUlEjhPkfL1ru8MV19u7XfY9Q/edit) **Assembly Materials Kit:** Coming soon **Video Tutorials:** Coming soon **Feedback: [https://forms.gle/Z7f41G4tYEE5u1s57](https://forms.gle/Z7f41G4tYEE5u1s57)\ [](https://forms.gle/Z7f41G4tYEE5u1s57)**