Manotech Associates

Low-Cost Prosthetic HandFebruary 9, 2006

Jina KimForrest LiauDavid LinKelsey VandermeulenTeresa Wang

Motivation

In low-income communities, hands important Accidents and civil war --> amputation

Cosmetics highly valued Functional body important for status in society

Current Solutions

Purely cosmetic

Functional Complex system

www.ossur.com

R. Doshi, Stanford University

How Can We Help? Novel mechanical design

Not our expertise Much prior art exists

Underlayer material Skin Fingernail Focus on one or more of these

Area of Innovation Customizable aesthetics

Underlayer •Size•Shape

Skin •Color•Texture

Fingernail•Size/shape/color/texture

Concepts for Size/Shape Customization Do-it-yourself custom mold Inexpensive factory-made mold sets

Adjustable mold (?)

Concepts forColor Customization Heat treatment Chemical treatment Paint/spray/coat

Concepts forTexture Customization Heat treatment Chemical treatment Abrasion Printing Manual application

Work Plan Overview Determine specs and desired properties

Research materials Test materials Assess feasibility of concepts Prototype prosthetic hand Test prototype

General Schedule

Det. Spec.

Res. Mat.

Test Mat.

Assess Feas.

Prototype

Test Prot.

MayFeb Mar Apr

Design Review Mid-term Review

Final PresentationInitial Prototype

Questions?

Manotech Associates

Forrest Liau -- forrest@mit.eduDavid Lin -- davidlin@mit.edu

Backup Slides

Underlayer Engineering

Desired Material Properties Durable and lightweight Shapeable for easier processing

Process Option 1:

• Use a relative’s hand for customization• Requires low-cost, quick-drying material

Option 2:• Use CAD and 3D printing to create different-

sized molds• More flexibility in selecting the mold

material

Skin Engineering

Desired Material Properties Liquid, spray, or thin films Possibly disposable High melting temperature Waterproof, elastic Bonds well (chemically, preferably) to underlayer

Process Liquid “skin”:

•Dip underlayer into liquid and allow it to dry

•Paint underlayer Spray:

•“Spray-on” skin•Consumer-friendly, convenient

Prosthetic Production Considerations

Color: prosthetic matches natural skin tone Shape: depends on user’s age and size Texture: to allow for gripping

Product Option 1: underlayer only Simpler processing

Product Option 2: underlayer + skin Skin can be replaced, instead of entire prosthetic Less concern about underlayer appearance, allowing for greater range of material options

Testing Durability

Expose prototype to heat and water Material contact with environment (dirt, animal hair, crops)

Determine time frame of wearing out

Social acceptance Survey prototype “authenticity” in affected populations

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