1. Low-Cost Prosthetic Progress Update
April 20, 2006
Jina Kim
Forrest Liau
David Lin
Teresa Wang

2. Overview Process Materials Prototype Wax & Plaster Latex & Silicone
Prosthetic suspension
Measure of success

3. Process

4. Problems with Wax & Plaster
Deformations
After hand extraction
Before pouring plaster
Plaster
Recipe
Compatibility with wax

5. Latex Glove TAP Plastics Brushable Latex Chemistry
Polymerized monomers (i.e. isoprene)
Sulfur/vulcanization

6. Silicone Underlayer Smooth-On Mold Max 15T, tin-based
Cures at room temperature overnight
Post-curing at 125 °F for 4-5 hrs
Chemistry
Base = organosiloxanes + silica
Catalyst = organotin

7. Suspension Method Advantages Disadvantages Negligible bulging
Less deformation
Disadvantages
Lack of control
Glove creases

8. “Success” Latex glove Silicone underlayer Fits well over other hand
Slight difference in finger length
Silicone underlayer
Roughly correct shape

9. Glove Materials Latex rubber Brushable silicone Surface adherence High
Minimal
Process
8-10 layers
1-2 layers
Cure time
Overnight
6 hours

10. Underlayer Materials Tin-based silicone Platinum-based silicone
Compatibility
Latex
Silicone
Durability
3-5 years
10 years
Cure time
24 hours
5 hours

11. Schedule
TODAY

12. Future Direction Platinum-based silicone prosthetic
More in-depth cost analysis
Optimize underlayer process
Develop how-to-make manual

13. Questions and comments?