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

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Presentation transcript:

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

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.

The Output KI Chon project proposal

Original Design

Modifications Cylinder Linear actuator BiStep Motor Controller

Cylinder

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

Motor Connection Diagrams

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

Driver Chip

Progress Overview LabVIEW VI

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

Results

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

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

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

Testing Integration Testing Pressurized Tube PI Calibration Live Subject

Questions