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Adjustable, Low Cost, Trans Tibial Prosthesis
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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 …

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