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Formal Design Review

Formal Design Review . Team 4 Limb-itless Chris Bruce, Anna Chen, Grant Hofmeister. Brief Update. Went to Dr. Miller’s prosthetist in NH Obtained plaster molds of Dr. Miller’s socket Obtained chemical composition of Liner. Problem Statement.

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Formal Design Review

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  1. Formal Design Review Team 4 Limb-itless Chris Bruce, Anna Chen, Grant Hofmeister

  2. Brief Update • Went to Dr. Miller’s prosthetist in NH • Obtained plaster molds of Dr. Miller’s socket • Obtained chemical composition of Liner

  3. Problem Statement • Redesign the transtibial prosthesis liner so that it is more comfortable. • Improve the load distribution of prosthesis to lower pain. • Allow for athletic use and volume changes during the day. • Decrease the “play” between the stump and the liner– make prosthesis easier to control.

  4. Design Focus • Focus on liner design • Socket redesign is not within our scope and timeframe. • Liner has more interesting material issues. • Great potential for advances in liner design. • Within liner, focus on suspension. • Less focus on accommodating volume change and other issues.

  5. Evolution of Design Initial Ideas • Magnets • Negative Poisson Ratio Material • Graded Elastic Modulus We will focus on the graded elastic modulus solution to improve the load distribution and “play.”

  6. Design Plan • Elastomer liner • Anisotropic Fiber support matrix • Pin attachment for connection with socket. Cross-section

  7. Elastomer Liner Materials Choices • Silicone • Polyurethanes • Spandex fabric for interface between socket and liner Design Issues • Variable Thickness • Shape • Choosing Material- Use ATR FTIR to determine chemical composition of current liners

  8. Clear Liner

  9. Clear Liner- Library Match

  10. White Liner

  11. White Liner- Library Match

  12. Materials Choices Kevlar Nylon Carbon Fiber Fiberglass Design Issues Density Orientation Adhesion to elastomer Fiber Length Fiber Matrix

  13. Fiber Purchasing Information

  14. Pin Attachment Materials Choices • Steel • Aluminum Design Issues • Compatibility with existing socket • Integration with liner

  15. Production of Liner Techniques • Mold with offset center • Include fibers and pin in mold design • Sew sheets together • Dipping Other Issues • Fabric Adhesion

  16. Risks • Liner-fiber adhesion • Delamination • Puncture of liner by fiber • Fabric adhesion • Variable thickness of liner • Controlling orientation of the fibers • Incorporating pin into liner

  17. Testing and Analysis • Tensile testing in multiple directions • Fatigue testing • Qualitative field testing with Dr. Miller • Comfort • Load distribution • Control of prosthesis http://www.instron.us/wa/products/universal_material/3360.aspx

  18. Gantt Chart

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