Manotech Associates

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• Manotech Associates
• Low-Cost Prosthetic Hand
• February 9, 2006
• Jina Kim
• Forrest Liau
• David Lin
• Kelsey Vandermeulen
• Teresa Wang

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Motivation

• In low-income communities, hands important
• Accidents and civil war -- amputation
• Cosmetics highly valued
• Functional body important for status in society

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Current Solutions

• Purely cosmetic

R. Doshi, Stanford University

• Functional
• Complex system

www.ossur.com
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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
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Area of Innovation

• Customizable aesthetics
• Underlayer
• Size
• Shape
• Skin
• Color
• Texture
• Fingernail
• Size/shape/color/texture

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Concepts for Size/Shape Customization

• Do-it-yourself custom mold
• Inexpensive factory-made mold sets
• Adjustable mold (?)

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Concepts forColor Customization

• Heat treatment
• Chemical treatment
• Paint/spray/coat

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Concepts forTexture Customization

• Heat treatment
• Chemical treatment
• Abrasion
• Printing
• Manual application

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Work Plan Overview

• Determine specs and desired properties
• Research materials
• Test materials
• Assess feasibility of concepts
• Prototype prosthetic hand
• Test prototype

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General Schedule
Design Review
Mid-term Review
Final Presentation
Initial Prototype
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Questions?

• Manotech Associates
• Forrest Liau -- forrest_at_mit.edu
• David Lin -- davidlin_at_mit.edu

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Backup Slides
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Underlayer Engineering

• Desired Material Properties
• Durable and lightweight
• Shapeable for easier processing
• Process
• Option 1
• Use a relatives 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

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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

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Prosthetic Production

• Considerations
• Color prosthetic matches natural skin tone
• Shape depends on users 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

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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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