Continuous Wave Doppler Device Group 16 Abbas Bandukwala

Continuous Wave Doppler Device Group 16: Abbas Bandukwala Padma Chunduru Chris Harvey Advisor: Dr. Raul Guzman

Project Objective Design, build and test a system to measure Doppler velocity waveforms in ankle blood vessels n Improve current technology n Better signal quality n Easier measurement n

Noninvasive Vascular Disease Diagnosis n Disease diagnosis using noninvasive techniques Check for presence, location, severity of disease n External diagnosis is quick, noninvasive n Screen high-risk patient populations n n Common vascular diseases Distort normal blood pressure and flow n Aneurysms, venous thrombosis, artherosclerosis n

Noninvasive Measurement n n n Leg vascular disease Blood pressure cuff occlusion technique Doppler velocity waveforms measured at DP and PT arteries in ankle

Doppler Velocity Waveforms Triphasic, Normal Biphasic, Abnormal Monophasic, Abnormal

Doppler Theory n n Measures velocity 2 piezoelectric crystals n n Crystals Transmitting, receiving Change in frequency due to movement of red blood cells Blood Flow RBC

Current Technology n n n Advantages/Disadvantages Hard to locate proper vein or artery if blood velocity is low. Must train person to use device. User hand tied down with device Device is compatible with all persons.

How we are going to go about solving the problem? Pick the best signal ? Audio Amplifiers Data Acquisitio n Ace Bandage Piezoelectric Crystals A/D Converter

Parts n n n n n Doppler crystals array ($45/crystal) Computer Connectors (~$25/crystal) A/D Converter Lab. View C++ or another computer program. An Ace bandage Doppler Gel Doppler Audio Amplifier

Past Work Investigation into the use of Doppler as a means of vascular disease diagnosis n Research on the equipment necessary for data acquisiton n Acquire Equipment n Ordered Crystals n Got access to an A/D converter n Ordered Wires n

Future n Test the effectiveness of the piezoelectric crystals n n n Test data acquisition with Lab. View Upon success with one crystal, develop an array n n Crystal and connectors compatibility with other equipment Experiment with different patterns Work on a program to pick out the most effective signal n n Lab. View C++