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
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.

13. Summary of Current Layout
Equipment
Halo area (in.^2)
Halo Area interfering with others (in.^2)
%halo area interfering with other halos
Halo area Interfering w equipment (in.^2)
%halo area interfering with other equipments
UBE
2400
2298
95.75%
185.4
7.73%
Bike
6552
4992
76.19%
2106
32.14%
Treadmill
8888
7380
83.03%
1299
14.62%
Treadmill w assistance
11466
7410
64.63%
859
7.49%
Steps
9792
5094
52.02%
1281
13.08%
Mat 1
4680
1320
28.21%
927
19.81%
Walking Bars
23352
N/A
Table
2880
Mat 2
2052
43.85%
Plint 1
10032
2850
28.41%
2736
27.27%
Plint 2
10374
798
7.69%
3192
30.77%
Plint 3
1482
14.77%
Plint 4
Rack
2100
570
27.14%
456
21.71%
Cabinet 1
4320
13.19%
Cabinet 2
Conference table
14432
4451.5
30.84%
2816
19.51%
Average
41.46%
18.99%
Std Dev.
28.51%
8.48%

14. Schedule

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