Institute of Biomedical Engineering Department of Engineering Science University of Oxford - PowerPoint PPT Presentation

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Institute of Biomedical Engineering Department of Engineering Science University of Oxford

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  1. Institute of Biomedical Engineering Department of Engineering Science University of Oxford Heart Soundsin Biosignal Processing ModuleCentre for Doctoral Training in Healthcare Innovation11/18 May 2012

  2. S1 – Atrial contraction S2 – Ventricular contraction S3 – Blood returning to the ventricle S4 – Ventricle is too full to contain the blood How a heart sounds Animation of heart valves opening and closing with sound “LUB” “DUB” Normal Abnormal S1 + S2 Lub - Dub S1 + S2 + S3 Ken – Tuck – Y S4 + S1 + S2 Ten – Nes - See

  3. Heart sounds http://commons.wikimedia.org/wiki/File:Phonocardiograms_from_normal_and_abnormal_heart_sounds_with_pressure_diagrams.png How heart sounds change during illness

  4. Heart sounds Chest piece transmits sound to the listener via air-filled hollow tubes • How to record heart sounds? • Acoustic Stethoscope

  5. Heart sounds Place a microphone in the chestpiece Moving magnetic coil  electrical signal • How to record heart sounds? • Electronic Stethoscope - microphone

  6. Heart sounds Connect one end of the crystal with the diaphragm Plates squeezed  electric signal • How to record heart sounds? • Electronic Stethoscope - piezoelectric

  7. Heart sounds Distance between plates Body Electromagnetic diaphragm with conductive inner surface Vibrations  electric signal Conductive plates • How to record heart sounds? • Electronic Stethoscope - capacitor

  8. Heart sounds Ascultation – library of heart sounds Plug-in stethoscope iStethoscope – turn your iPhone into a stethoscope Phone apps

  9. Heart sounds Other uses of stethoscopes:

  10. Heart sounds Any Questions?