Progress Report: Week 2 February 16, 2006 Manotech Associates Jina Kim Forrest Liau David Lin Teresa Wang

Product Proposal Customized prosthetic hand The “Manotech Approach”  Low-cost, self do-it kit Consumer ease  Reversible mold Innovative process

Progress Overview Components of Focus  Underlayer  Mold Justification  More fundamental parts for shape and function Work  Interviews  Development of component material specifications  Materials research

Interview 1: Dr. Samuel Koo BU Dental Phone interview with Forrest Recommended dental mold materials  Polyether Gives more detailed mold  Silicon addition Less accurate

Interview 2: Professor Roylance Associate Professor of Materials Engineering, MIT Personal interview with Jina and David on Recommendations on mold materials  Room temperature vulcanization (RTV)  Silicones and urethanes

Material Specifications: Underlayer & Mold Price  < $20 total for simple function, cosmetic appeal Solidification at Room Temperature Conformability Flexibility of material  Underlayer: to accommodate prosthetic function  Mold: to allow reversal Compatible with other materials in prosthetic

Mold Materials CompanyProductSpecifications US Composites RTV Liquid Urethane Mold Rubber Hardness, Shore A: 30 Demold time: 24 hours Soft, stretchable TAP Plastics Urethane RTV Mold- Making System Hardness, Shore A: 30 Cure time: 24 hours Tear-resistant, good for detail PolycastRTV-885 Silicone Hardness, Shore A: 20 High strength, low viscosity, good for complex patterns

Underlayer Materials - Silicone Rubber Properties  Low shrinkage, high strength  Hardness, flexibility CompanyProductCure time Cure temp Price (per 2 lbs) Nicolas SarraPo Yo Putty 30/40 > 7 min. 23 deg C Nicolas SarraEquinox 25/35 Fast 7 min. 23 deg C Polytek Development Corp. PlatSil Gel min. 25 deg C Specialty Silicone Products SSP deg CFree sample

Future Work More Interviews  Local make-up artists  Michael Rubner, Paula Hammond Materials Testing  Try out idea of a “reversible mold”  Underlayer flexibility, using toy endoskeleton

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