Adjustable, Low Cost, Trans Tibial Prosthesis

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My final presentation for Biomedical Engineering Junior Design, Spring Quarter of 2009. Rose-Hulman\'s Junior Design program includes everything up to the point of manufacture, serving as an entry point for the four quarter sequence in which students undertake and complete their capstone project. I was lead development engineer of the foot subsystem, Tyler Kreipke lead the shaft subsystem, and Justin Druba lead the socket subsystem.

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Adjustable, Low Cost, Trans Tibial Prosthesis

  1. 1. Adjustable, Low Cost, Trans-Tibial Prosthesis<br />Paradigm Designs<br />Kyle Harbison, Justin Druba, and Tyler Kreipke<br />
  2. 2. Problem: Children in disadvantaged areas often lose their lower leg due to landmines<br />Problem Statement: Develop a trans-tibial prosthesis that maintains an adaptable and abiding integrity while being able to be produced and maintained with limited resources. <br />Background<br />
  3. 3. Support normal forces associated with gait<br />Adjust to account for user growth<br />Be low cost<br />Be maintainable in disadvantaged areas<br />Feasibility Criteria<br />
  4. 4. Modular approach resulted in designing three alternatives per subsystem<br />Three Subsystems<br />Socket – Connection to residual limb<br />Shaft – Major length adjustability <br />Foot – Accommodation towards varying terrain<br />Preliminary Designs<br />
  5. 5. Socket Preliminary Ideas<br />Cinch Basket<br />Brace<br />Removable Padding Basket<br />
  6. 6. Shaft Preliminary Ideas<br />Slide ‘n’ Tight<br />Threaded Leg<br />Crutch Leg<br />
  7. 7. Foot Preliminary Ideas<br />Spring Foot<br />Split Hoof<br />Slider<br />
  8. 8. Merit Criteria<br />
  9. 9. Adjustability in terms of upper leg accommodation is achieved in this system<br />User comfort is the key determining design aspect for this subsystem<br />Neoprene coated nylon basket, steel brace components<br />Socket Subsystem<br />
  10. 10. Adjustability in terms of prosthetic height is achieved in this subsystem<br />Achieves a range of 11 through 15.4 inches of adjustability<br />Aluminum 2024<br />ShaftSubsystem<br />
  11. 11. Polyoxymethylene – same material used in existing products<br />Multi-axial stability over varying degrees of terrain<br />Conservation of energy specifically targeted within heel dimensions<br />Foot Subsystem<br />
  12. 12. Final Assembly<br />
  13. 13. Loading Calculation<br />Length Calculation<br />Engineering Calculations<br />Shortest Length = 11.0”<br />Longest Length = 15.4”<br />
  14. 14. Stress Calculations<br />Engineering Calculations<br />Socket Support <br />Beam Thickness (h)<br />h&gt;0.34”<br />
  15. 15. Engineering Calculations<br />Stress Calculations<br />Foot Width (b)<br />B&gt;1.37”<br />
  16. 16. Budget<br />
  17. 17. Socket Subsystem: Create a more adjustable basket<br />Shaft Subsystem: Use a different material for the inner shaft<br />Foot Subsystem: Perform material tests on Delrin<br />Further Considerations/Recommendations<br />
  18. 18. Questions?<br />

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