Poster 151: A new prosthetic arm and terminal device for sports, work, and activities of daily living.

Abstract

Objective: To develop a new prosthetic arm and terminal device that is durable enough to withstand high-intensity sports, while being easily adapted for activities requiring a high degree of dexterity. Design: Basic research and development, prototype construction and testing. Setting: Outpatient prosthetic clinics. Participants: 5 unilateral above-elbow amputees. Intervention: Construction of prototype prosthetic components compatible with amputees’ current prostheses. Main Outcome Measure: Ability to participate in high-intensity sport; functional comparison to other currently available components. Results: This new prosthesis has several unique features. The elbow incorporates a shock absorber to combat the high impacts associated with sports, such as mountain biking and motocross. Elbow flexion and extension and internal and external rotation are adjustable. The terminal device consists of a flexion wrist, quick connect coupling, and a terminal bracket. The quick connect coupling allows voluntary release in the event of a crash, but the device will not release accidentally. The terminal device has 4 degrees of freedom, permitting a high degree of adjustability. The terminal bracket is easily exchanged and, in stock form, can accept tools, utensils, and other objects that have had a 1.5-in handle molded around them. A large contact area provides a secure grip. Conclusions: This new prosthesis has significant advantages over currently available componentry. To our knowledge, these are the only upper-extremity components durable enough to withstand very high-intensity activities. The flexion wrist and terminal bracket offer twice the degrees of freedom of other terminal devices, while providing a much stronger grip. Tools and other objects are easily modified to be compatible with the terminal device.