NIOP Shelbow

thingiverse

Inspired by the Ugunugu elbow designed by Miguel Rivera, the Shelby prosthetic elbow is a key component of the NIOP modular arm catalog. It's specifically tailored for transhumeral amputees and individuals with limb differences who lack an elbow. The four screw holes at the base align perfectly with the NIOP Helix Cuff pattern, found on https://www.thingiverse.com/thing:3639770. Most parts are printed, requiring only a minimal amount of hardware to assemble - a bolt for the elbow and 12 screws. This prosthetic elbow boasts both flexion and humeral positioning capabilities that can be adapted to various settings, along with a grip lock feature that secures the hand's grip position. It seamlessly integrates with the NIOP Kwawu Forearm and Hand remix and other compatible hand designs currently in production, as seen on https://www.thingiverse.com/thing:3639854. The drive-line is secured by a Brace Plate attached to the wearer's back, available on https://www.thingiverse.com/thing:3712119. When fully assembled (Kwawu/Shelby/Helix Cuff at 100% size), the arm weighs approximately 1lb 9oz, including hardware. It is crucial that a professional prosthetist provides guidance before using this device, as improper fitting can lead to permanent damage to the wearer. If access to a doctor is limited, visit enablingthefuture.org to find a volunteer prosthetist for assistance. An OpenSCAD file for sizing the device will be made available soon. In the meantime, users can refer to the temporary sizing method: The 100% arm size is based on a forearm length of 220mm, measured from the crease of the elbow to the crease of the wrist. To determine your print scale, divide your forearm length in mm by 220. This will give you the scale factor to use in your slicer. For bilateral recipients, this device was designed for someone 5'-6" tall. Due to the adjustable Helix Cuff, the device can be sized proportionally to the recipient's arm length. These STLs are specifically made for a Left arm device; most parts (excluding switches and pins) should be mirrored for Right arm devices. Assembly instructions can be found on https://docs.google.com/document/d/13VLW0BEGWytAss0vmlA_FSM1s5sgCWiQNSQEWfPTh58/edit. Links to materials can be accessed at https://docs.google.com/document/d/1_i3BSe7nnHnZhTax_osXeQR7MjQyPMPcE9OXrI1mpeA/edit