Biomedical Instrumentation Problem Sheet 2

Biomedical Instrumentation Problem Sheet 2

Heart Sounds in Biosignal Processing Module Centre for Doctoral Training in Healthcare Innovation 11/18 May 2012 INSTITUTE OF BIOMEDICAL ENGINEERING DEPARTMENT OF ENGINEERING SCIENCE UNIVERSITY OF OXFORD How a heart sounds Animation of heart va

lves opening and clos ing with sound LUB DUB S1 Atrial contraction S2 Ventricular contraction S3

Blood returning to the ventricle S4 Ventricle is too full to contain the blood S1 + S2 S1 + S2 + S3 S4 + S1 + S2 Lub - Dub Ken Tuck Y Ten Nes - See Normal

Abnormal Heart sounds How heart sounds change during illness http://commons.wikimedia.org/wiki/ File:Phonocardiograms_from_normal_and_ab normal_heart_sounds_with_pressure_diagra ms.png Heart sounds

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

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

Connect one end of the crystal with the diaphragm Plates squeezed electric signal Heart sounds How to record heart sounds? Electronic Stethoscope - capacitor Electromagnetic diaphragm with conductive inner surface

Distance between plates Vibrations electric signal Conductive plates Body Heart sounds

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

Other uses of stethoscopes: Heart sounds Any Questions?

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