LOW COST COSMETIC HAND PROSTHESES G

Body powered prostheses are the most common type of upper limb prostheses. It allows the prosthetic user to control the terminal device (usually a hook or a hand) via a harness system that fits around the chest and shoulder. This type of prosthesis is very reliable and can be used in environments involving dust and water.

Advanced Arm Dynamics - Finger and Partial Hand Options

Design of an Articulated Thumb for a Low-Cost Prosthetic Hand will be available on

Partial Hand Prostheses | Genesis Prosthetic Arts

Background
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.

With the above deficiencies and suggested improvementsin mind, the design objectives for the new body-poweredprosthetic hand were established.

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.

Hand Prosthesis . Hand Prosthesis There may be a functional and / or cosmetic hand.

In a cosmetic prosthetic hand, ..


Biscapular abduction and/or glenohumeral flexion effectfinger flexion by way of a cable. Control cable technologyhas not changed significantly in the past 50 years (12).Traditionally, body-powered prostheses have used stainlesssteel cable, with end fittings attached by special crimpingtools. Users of body-powered hands report replacement of thecable as their most frequent maintenance problem (6), andone that cannot be solved at home, because specialized toolsare required. Additionally, cable stiffness makes followingsharp radius bends difficult, reducing efficiency (12).

the elbow joint and open or close the hand or hook at the end of the prosthesis

Lifelike Finger Prosthesis | Prosthetic Hand, Toe, …

The purpose of the prosthetic socket is to transmit forces from the residual limb to the prosthesis. A well constructed socket will provide comfort and stability during walking and standing on a prosthesis. Traditionally, sockets were made out of materials that were available as natural resources. Wood, metal and leather were predominantly used until the 1960’s. The introduction of plastics, fibre-glass and carbon-fibre revolutionized socket manufacturing and design, making them lighter and much more durable.

The design and development of a gloveless endoskeletal prosthetic hand ..

in passive hand prostheses with good cosmetic ..


Input forces required to grasp everyday objects weremeasured for each of the hands (Figure 9). Objectsincluded a pen, small book, coin, newspaper, telephonehandset, notebook, film canister, and tennis ball. Onaverage, the endoskeletal hand required 33 N to pick up eachobject. The Otto Bock and APRL prostheses required anaverage of 37 N and 41 N respectively. Thus, to grasp theseobjects, the endoskeletal hand required approximately 12percent less input force than the Otto Bock, and 24 percentless than the APRL hand. These results are slightlysurprising, given the relatively low force transmissionratio of the endoskeletal hand.