Advanced Arm Dynamics - Finger and Partial Hand Options
Partial Hand Prostheses | Genesis Prosthetic Arts
Interest in prosthesis design that coincided with thereturn of wounded American soldiers from World War II hasdecreased in recent decades. The design of body-poweredupper-limb prostheses in particular has experienced few, ifany, major breakthroughs since the early 1960s (1). Personswith amputation frequently express dissatisfaction with thecurrent state of upper-limb prosthesis technology (2),noting numerous deficiencies with their prostheses. Yetcontinued advances in materials science make more functionaland realistic-appearing prostheses increasingly possible.
A Simple Cosmetic Partial-Hand Prosthesis - ScienceDirect
Upper-limb prostheses are either hook or hand-shaped,and are actuated by body or external power. In the UnitedStates, approximately 70 percent of users wear hooks (3).Outside the United States, especially in developingcountries, there is a greater preference for hand-shapedprostheses. Compared to hooks, prosthetic hands generallyoffer less function and durability at greater weight andcost (4). Nonetheless, many individuals still choosehands over hooks, primarily for cosmetic reasons. Our goalwas to design a new prosthetic hand that addresses thesedeficiencies by increasing function and appearance whiledecreasing cost and weight.
Design of an Articulated Thumb for a Low-Cost Prosthetic Hand
Cable and Adapter
SpectraTM (Allied-Signal, Inc., Petersburg, VA), apolyethylene fiber used in stunt kite flying, is used toactuate the fingers. Carlson et al. (12) had previouslydetailed its potential applications in upper-limbprostheses. Spectra has adequate tensile strength and, whenused in a teflon liner, offers longer fatigue life than 1/16in steel cable. Thinner and more flexible than steel,Spectra can be used within the endoskeletal fingers thatassume tight angles of bending during flexion. The lowcoefficient of friction of Spectra, particularly inconjunction with its teflon liner, minimizes frictionallosses in the internal mechanisms.
partial hand amputations who use a prosthesis are ..
The new prosthesis uses a standard male 1/2-in, 20-pitchattachment to the wrist unit. The harness cable runs throughthe centerline of this fixture. This routing allows rotationof the hand about the fixture axis without displacing theharness cable and moving the fingers.