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Continuous Wave Doppler Device

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 Improve current technology Better signal quality

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Continuous Wave Doppler Device

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

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

  3. Peripheral Vascular Disease (PVD) • Definition: restriction of blood flow to limbs due to narrowing or clogging of arteries • Causes • Common vascular diseases • Artherosclerosis, aneurysms, venous thrombosis • Distort normal blood pressure and flow • At risk populations • >50 years old • Smokers • Diabetics • High blood pressure or high cholesterol

  4. Peripheral Vascular Disease (PVD) • Incidence of PVD • 1 in 20 people >50 years old = ~10 million people • 75% of cases go undiagnosed • Importance of Diagnosis • PVD is a strong predictor of heart disease • PVD patients are at a higher risk of stroke and heart disease • Build up of plaques in peripheral arteries is the leading cause of amputation in the United States

  5. Noninvasive Vascular Disease Diagnosis • Disease diagnosis using noninvasive techniques • Check for presence, location, severity of disease • External diagnosis is quick, noninvasive • Screen high-risk patient populations • Goal: reduce the number of undiagnosed cases of PVD

  6. Noninvasive Measurement • Blood pressure cuff occlusion technique • Doppler velocity waveforms measured at DP and PT arteries in ankle

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

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

  9. Current Technology • 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.

  10. Advantages of Doppler Array • Cheap • Small • Does not require trained crew • Works on a high percentage of the population • Universality of device • User is able to perform multiple functions

  11. Doppler crystal array ($45/crystal) Computer Connectors (~$25/crystal) A/D Converter LabView C++? Doppler Audio Amplifier An Ace bandage Doppler Gel Oscilloscope Power supply Op-amps, resistors, capacitors Breadboard Parts

  12. How we are going to go about solving the problem? Power Supply Data Acquisition & Analysis Ace Bandage A/D A/D LabView A/D A/D Piezoelectric Crystals High Pass & Amplifier circuits

  13. Past Work • Investigation into the use of Doppler as a means of vascular disease diagnosis • Research on the equipment necessary for data acquisition • Acquire Equipment • Design of High Pass filter and Amplifier to increase SNR

  14. Current Status Oscilloscope • Testing Doppler crystal compatibility with other equipment. • Created high pass filter and amplifier to get better signal. • Getting a signal on Audio Doppler box • Having difficulty getting a signal on oscilloscope and voltmeter. Audio Doppler Box Signal Out Signal In Amplifier Doppler Crystal High Pass Filter

  15. High Pass Filter and Amplifier Op Amp Op amp

  16. Future • Increase sensitivity so the input signal can be perceived • Test data acquisition with LabView • Upon success with one crystal, develop an array • Work on a LabView program to pick out the most effective signal

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