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Developed by Dr. Kee Moon and Jeremiah Cox, the device seeks to better conform to the way the body moved before an accident or injury occurred. Rather than rigidly control the movements of the leg, their device nudges - or kicks - the leg to begin natural physical motion. In the future, the bionic leg will further tie in with the brain to better adapt to former muscle memory, allowing the patient to better achieve their previous and unique way of walking or moving.

From video description:

Just before Thanksgiving 2013, Not Impossible's Mick Ebeling returned home from Sudan's Nuba Mountains where he set up what is probably the world's first 3D-printing prosthetic lab and training facility. More to the point of the journey is that Mick managed to give hope and independence back to a kid who, at age 14, had both his arms blown off and considered his life not worth living.

Low cost easy to deploy technology that empowers and helps people directly. Strong STRONG example of impact of DIY 3d printing.

Press release:

http://media.wix.com/ugd/9bcbad_b72353cd3bed48f49391924d4a7448a9.pdf

http://www.notimpossiblelabs.com/

Medical prosthetic hand price compared to diy 3d printed prosthetic hand. The price difference is enormous. There are many many reasons for this ... maybe I'll make some sort of analysis in the future ...

Fully 3d printable prosthetic hand that reacts controlled by smartphone and sensor on healthy limb. By using simple 3d printing materials they sacrifice robustness but give easily repairable prosthetic with easily produced replacement parts. Fingers with three joints are actuated by single motor. It is much cheaper then regularly produced prosthesis.





From project site:

Description

Function
''Myoelectric Prosthetic Hand'' is an artificial hand that recovers lost functions of amputees. It utilizes electrical signal measured on skin surface of their remaining muscles. A variety of myoelectric prosthetic hands has been developed around the world, however, none of them are offered at an affordable price costing more than $400. We solve this problem in following ways: 1. Using smartphone. Conventional hands required an exclusive device for computation. We replace this with a smartphone which users have. 2. Using 3D printer. One of the main reason that makes components expensive is strict requirement on robustness. In sacrifice of robustness, we offer repairable hand. All components are printable by a 3D printer, enabling users to modify and reproduce them easily. 3. Under-actuated mechanism for finger flexion. To reduce the number of motors, we developed a three-joints finger actuated by one motor that passively changes its trajectory depending on the shape of an object.

Inspiration
Our team has been working on myoelectric prosthetic hand since college days. We were pursuing highly functional hand that can perform strong, precise and diverse motions. Talking with amputees, however, we realized that high functionality is not necessarily the first priority to reduce their daily challenges. ''My only hand is useless because of an umbrella in a rainy day. I cannot eat steak by myself since knife and fork requires two hands.'' said my amputee friend. These tasks don’t require dexterous motions. It is rather the ''price'' of prosthetic hand that restricts amputees from using myoelectric prosthetic hand. Therefore, ''Handie'' is designed to provide amputees with sufficient functions at an affordable price.

Development
We defined Handie's essential function as ''to support the dominant hand''. To realize this, we set minimum number of motors as six: ''thumb rotation'' and flexion of each finger. Thumb rotation is necessary because thumb is facing other fingers when grabbing an object, while it is parallel to other fingers when holding down an object on a table. Secondly, to reduce the cost, we utilized 3D printer. Besides skeleton, we made ringshaped elastic elements placed at finger joints also by 3D printer. Through iteration of prototype, the shape of the element was optimized to have required strength and other properties. Finally, to make the hand easy to repair and reassemble, we separated the skeleton of each finger into units

Source:

http://www.jamesdysonaward.org/Projects/Project.aspx?ID=3897&RegionI