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Transcript
Group 2: Heart Sounds Project Alvaro Franco Tuan Nguyen Menline Lu Edgar Umpierrez Rudy Martinez HEART SOUNDS OVERVIEW • • • • • • • Clinical Aspects and Physiology Mechanical Interface Design Electronic Module Design Video Demonstration Long Term Data & Results Future Directions / Improvements Live Demonstration Pulmonary Circuit Pulmonary Veins Pulmonary Arteries L. Atrium L. Ventricle Oxygen-poor CO2 rich blood Oxygen-rich CO2 poor blood R. Atrium R. Ventricle Systemic Veins Systemic Arteries Systemic Circuit Pathway of Depolarization SA node Internodal Pathway AV node AV bundle Bundle Branches Purkinje fibers The cardiac cycle have three phases: Phase 1 Ventricular filling Phase 2 Ventricular systole Phase 3 Isovolumetric relaxation Blood Flow is Controlled by Pressure Changes •Pressure changes reflects the contraction and relaxation of the heart • Blood moves from higher pressure to lower pressure • Changes in the pressure is the reason why the heart valves open and close and keeps the blood flow moving in forward direction Heart Sound S4 Heart Sound S3 Schematic Band Pass Filter Specifications First order filter Low pass (fc= 120Hz) Gain= 1 Filter output Specifications High pass (fc= 20 Hz) Gain= 10 First order filter Inverting Amplifier Specifications Gain = 100 Amplifier output Envelop detector Specifications C= 1uF R= 1MΩ T= 1s Envelop output Long Term Data Resting Standing Running Observations About Results • Reliable Signals • Subject must be still and relaxed. • Subject and his/her surroundings must be quiet. • Unreliable signals • Subject Moves or talk/laughs. • Environment is loud and full of activity. • Interfering noises coming from surrounding environment. Heartbeat Motor of Today • A wrist watch or a mobile phone • A chest strap • Microprocessor • EKG • Other Parameter Today’s Heartbeat Monitor • The Berkeley Tricorder Future Direction Cont’ • Heartbeat Sensor • University of Sussex • Military personnel usage • Civilian Usage Lessons Learned • Amplifier gain equal to 1000 • A band pass Filter between 20-120 Hz • This prototype can detect S3 and S4 sound Thank you !!! Questions?
