1. Servo-Controlled Blood Vessel Occluder Ahmed El-Gawish, Alan Chen, Hugo Loo, & Imad Mohammad Advisor: Ki Chon

2. Objectives Renal autoregulation research The device increases or decreases blood pressure by ~20 mmHg with fast response times The response time should be in order of 100 ms.

3. The Output KI Chon project proposal

4. Original Design

5. Modifications Cylinder Linear actuator BiStep Motor Controller

6. Cylinder

7. Linear Actuator 50 lb Stepping actuator rated nominal force 1600 steps per inch 5 inch stroke length 4 connecting leads Herbach & Rademan Company (www.herbach.com)

8. Motor Connection Diagrams

9. BiStep Motor Controller Complete Unipolar/Bipolar dual stepper motor controller system Terminal block connectors for its TTL input control as well as its motor output and power connections Jumper for switching between use of TTL-serial and RS232- serial Parallax inc

10. Driver Chip

11. Progress Overview LabVIEW VI

14. Warning! The following slides may be unsuitable, offensive, or possibly even kinda-sorta profoundly disturbing to some viewers. Viewer discretion is advised

16. Results

17. Output Red is the Blood Pressure signal, blue is the average over time, response time is approximately 300 ms in this plot

18. Setbacks Response time Undershoot due to PI Automation Funds not fully exploited

19. Further Improvements Faster/more accurate motor Optimize cylinder diameter VI improvements (more controls/analysis) Control, control, control

20. Testing Integration Testing Pressurized Tube PI Calibration Live Subject

21. Questions