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Upper Extremity Design Update

Upper Extremity Design Update. March 23, 2007. Device Description. Acrylic beam guides motion Bungee cord with ratchet provides adjustable force Backpack frame provides stability and base for vertical and horizontal adjustment. Solid Works Drawing. Material Selection.

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Upper Extremity Design Update

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  1. Upper Extremity Design Update March 23, 2007

  2. Device Description • Acrylic beam guides motion • Bungee cord with ratchet provides adjustable force • Backpack frame provides stability and base for vertical and horizontal adjustment

  3. Solid Works Drawing

  4. Material Selection • Material changed from acrylic to acetal • Chemical and sunlight resistance promote longer life • Material properties (tensile modulus, fatigue strength, yield stress) well-suited to required dimensions

  5. Material Selection • 3/8” beam requires a width of 5 inches at the base to satisfy fatigue strength requirements • Tapered width from 5” at base to 3” at end produce adequate deflection at max force (10 lbs.)

  6. Testing • Each Rotation is counted as one repetition Rotation Motor

  7. Testing .146H Total Arm = .186H+.146H .186H .146 H .186H .146H x .186H (.146H)2+(.146H)2 = x2 For 95%tile Male x=15.17 inches

  8. Contingency Plans • Telescope Issues • Resiliency of Bungee Cord • Beam Behavior • Backpack Modification

  9. Schedule

  10. Facility Redesign • Objectives • Reduce Avg. % of halos overlapping with other halos. • Reduce Avg. % of halos overlapping other equipment by at least 50% (9.5%)

  11. Monitor improvements • Improve utilization of cabinets and shelves. • Reduce frequency therapist avoids an obstacle. • Currently 50% of related activities • Availability of equipment • Currently 25% obstructed/unavailable. • Increase therapy space • Currently therapy space 580 sq. ft.

  12. Summary of Current Layout

  13. Schedule

  14. Ramp Modification • Solution: • Add wheels and handles to make the ramp and platform easily movable • Before modification: 50 lbs. of force required • After modification: 16.7 lbs. of force required

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