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Christine Bronikowski, Amanda Chen, Jared Mulford, Amy Ostrowski

Analyzing the forces within transtibial prosthetic sockets and design of an improved force minimizing socket. Christine Bronikowski, Amanda Chen, Jared Mulford, Amy Ostrowski. Advisor: Aaron Fitzsimmons, The Surgical Clinic. Problem Statement.

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Christine Bronikowski, Amanda Chen, Jared Mulford, Amy Ostrowski

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  1. Analyzing the forces within transtibial prosthetic sockets and design of an improved force minimizing socket Christine Bronikowski, Amanda Chen, Jared Mulford, Amy Ostrowski Advisor: Aaron Fitzsimmons, The Surgical Clinic

  2. Problem Statement • Lack of research in the socket interface between the artificial limb and the residual limb, specifically force profiles • Majority of the research focused on components with higher potential financial gains • Problems with skin irritation, varying degrees of pain, tissue breakdown, pressure ulcerations, and resultant infections at the socket interface develop

  3. Project Goals • Acquire accurate measurements of the forces acting on the residual limb of an amputee during various movements • Determine areas of highest force • Design a socket system in which the forces are optimally distributed throughout the cross-section of the surface between the residual limb and socket • Increase overall patient comfort

  4. Current Socket Designs • Designed on a case-by-case basis for individual patients

  5. Method of Force Analysis • Force Sensing Resistor (FSR) placed directly in socket • Very thin-will not cause variation in force determination • Change in resistance when force is applied, converted to a voltage difference

  6. Current Work • Circuit design: current to voltage converter

  7. Design/Safety Considerations • Sensitivity/saturation of FSR may not be within desired force range • Wire thickness: thin enough to prevent interference with force data • Thick enough to not break during movement/walking • FSR-wire connection: must be durable due to movement of limb • Low temperature solder: must not melt FSR plastic

  8. Future Work • Insertion of ~15 FSRs into limb-socket interface of “model” patient, Cody • Test run: determine if FSR saturates, stays intact, comfort and safety of Cody • Repeat with ~10 patients • Rotate FSRs within socket to cover entire area • Test multiple surfaces (incline, flat, stair) • Analyze results, determine location of maximum force • Design and develop a new socket: provide more flexibility in areas of greatest force

  9. Determination of Success • Design is patient-driven • Survey and level of comfort pre and post new socket

  10. References

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