1. Instrumented Hand Exerciser
Client: Dr. Alexander Yevzlin
Advisor: Dr. John Webster
Team Members
Brian Ginter (Team Leader)
Patrick Kurkiewicz (BWIG)
David Leinweber (Communicator)
Matt Hoffman (BSAC)

2. Outline Background Problem Statement Current Devices
Design Constraints
Design Ideas
Design Matrix
Circuitry
Future Work

3. Background Information
Dialysis
Replaces kidney function
Fistula
Vein to artery
Exercise promotes maturation
Encourage blood flow

4. Problem Statement Stress ball device Uses in medical testing
Post-surgery exercise
Record/transmit data
Uses in medical testing
Ideal exercise regiment

5. Current Devices Ordinary stress ball Pros: Cons: Exercises hand
Increases blood flow
Matures fistula
Cons:
Ideal exercise regiment unknown
Pressure
Duration
Count

6. Design Constraints Price Comfort Portable Durable
<$10 USD (Production)
Comfort
Lightweight
Squeezable
Portable
Self-contained
Durable

7. Design 1: Piezoelectric
Three piezoelectric sensors
ADC to
laptop
OP Amp
Three Piezoelectric Sensors all orthogonal to each other in middle of stress ball

8. Pros and Cons Pros Cons Inexpensive Accurate Linear Graph Circuitry
Three sensors
Hand positioning

9. Design 2: Air Bladder

10. Pros and Cons Pros: Cons: Shape of Bladder Accuracy of transducer
Directionality
Cons:
Bladder longevity
Transducer costs

11. Design 3: Inductors Inductors configured in 3-D
Inductance changes with applied force
Measure inductance change, convert to pressure

12. Pros and Cons Pros: Cons: Low cost Directionality Difficult design
Inductor deformation

13. Design Matrix Cost Design 1 (Piezo) Design 2 (Pressure)
Design 3 (Wire)
Cost 6 7 4
Accuracy 8 2
Durability 5
Ease of construction
Ease of Use
Size 9
AVERAGE
6.167
6.667
5.167

14. Circuitry

15. Future Work Meet with client Dr Alex Yevzlin
Finalize design ideas and begin construction
Begin testing
Make modifications based on size and performance
Produce prototype to run off of laptop

16. Questions

17. References
FlexiForce® Sensors - Specifications & Features.