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Manotech Associates Low-Cost Prosthetic Hand February 9, 2006 Jina Kim Forrest Liau David Lin Kelsey Vandermeulen Teresa Wang. Motivation. In low-income communities, hands important Accidents and civil war --> amputation Cosmetics highly valued - PowerPoint PPT Presentation
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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
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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