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

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

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

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

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

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

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

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

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

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