Printing Out Disability: Leveraging 3D Printing Technology for Prosthetics Production in Uganda

Building on extensive research and development led by Dr. Matt Ratto at the University of Toronto, the cbm Canada project uses a 3D printer to make a precision-fitted plastic socket to connect a child's residual limb and a standard artificial leg provided by aid agencies. Step one requires a precise digital image of a child's limb: early efforts involved a $200 Xbox scanner accessory used in computer gaming, which follows a player's physical movements to put him or her in the action. Now, a next-generation "Sense" scanner rotated in an arc around the leg stump for 45 seconds, is used that, in tandem with inexpensive Skanect software, recreates the residual limb virtually. The next breakthrough was enabled when Dr. Ryan Schmidt of Autodesk Research enhanced a software program he created (while he was a University of Toronto student) called Meshmixer. His adaptation enabled project leaders to create the socket virtually and quickly, using the powerful graphics card in a high-end portable gaming laptop. A 3D printer then produces the custom-fitted socket using about $3 of cornstarch-based PLA plastic. Since the entire process requires under six hours, the prosthetic sockets can be replaced easily and cheaply as a child amputee quickly grows. By comparison, producing a socket in Uganda today currently involves five to six labour-intensive days and the use of plaster of Paris molds dried in the sun, often resulting in ill-fitting sockets, the discomfort of which discourages their use. Under the management of Mitch Wilkie, Director of International Programs, and Emily Kere, Senior International Programs Officer, both at cbm Canada, the project team will experiment with both plastic materials and techniques for 3D printing the wall of the socket to provide the greatest strength and durability with the least weight and material. They will also evaluate the potential use of Canadian custom-made 3D printers that may be better purposed for this application in the developing world. Most importantly, the team will incorporate good development principles by ensuring disability inclusion, gender equity and environmental sustainability within the project's scope.