FistHand is designed by Mike LI, Hong Kong Maker Club. It is a remix of the Gripper Thumb Terminal Device originally designed by Skip Meetze. The aim of the design is to make 3D printed prosthetic hands as functional devices. FistHand is a prosthetic hand with voluntary open design for amputees without palm or partial lower forearm. The working mechanism is similar to traditional body powered prosthetic hand, by using cables to link the movement of the body to the prosthesis and to control it. Moving the body in a certain way will pull on the cable and cause it to open and close the devices. (http://www.upperlimbprosthetics.info/index.php?p=1_9_Body-Powered) The advantages of 3D printed design are low production cost, rapid design for fitting different amputees and “Hand” shape appearance for amputee's acceptance.
FistHand is designed for its first priority as a functional device. We hope amputees wearing this prosthetic hand would help them to be able to work in their working environment and increase their employment rate. The palm is exchangeable to cater different scenarios. For daily-life, it would be a functional hand for amputees to catch different size of objects firmly such as opening cans or bottles, wearing clothes, cutting food, holding tools, etc. For farming, it would be a sickle to harvest rice. In factory environment, it would be a heavy-duty pliers for holding machinery. The device is designed to handle specific functions to meet user’s needs.
Currently, the devices are now under testing for some amputees in Kong Kong. And it is now collaborating with Social Enterprise e-NABLE Sierra Leone for printing and assembling prosthetic hands for needy amputees. We promote 3D printed prosthetics through STEM education. Students, teachers and family members would participate the project and assemble prosthetic hands to help the needy people.
FistHand is still in testing phase and its design will be improved time by time. Currently, we use Belnder3D for design. We hope finally we will design and produce a low cost, easy assembly and functional prosthetic hands for the amputees.
Hong Kong Maker Club
Assembly demonstration (a very early version, will update new version soon)
e-NABLE Sierra Leone - Facebook
3D Print Prosthetics Project, Hong Kong Maker Club