Medical Applications Electrocardiogram (ECG)
Glossary of Terms <ul><li>AED  Automated External Defibrillator – Auto diagnosis with  voice directed treatment. </li></ul...
ECG Markets  ECG Professional Healthcare Consumer Diagnostic Above Diagnostic AED Defibrillators Commercial  Fitness Equip...
ECG Waveform (Filtered)
ECG – Waveform Characteristics <ul><li>ECG Signals have two components:  </li></ul><ul><ul><li>ECG Waveform </li></ul></ul...
ECG – Patient Skin Surface Characteristics <ul><li>Skin Impedance </li></ul><ul><ul><li>Standards require  of common mode ...
Signal Chains
Diagnostic ECG (Clinical Use)
Diagnostic ECG  In-amp + Right Leg Drive
Diagnostic ECG  Filters + Pace Detection
Diagnostic ECG  ADC + Isolation + Processing
Low Power, Low Cost, Wireless ECG  (Holter Monitor)
Low Cost, Low Power AED
Exercise Heart Rate Monitor   (Example: treadmill with heart rate monitor)
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Medical applications-ecg

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Medical applications-ecg

  1. 1. Medical Applications Electrocardiogram (ECG)
  2. 2. Glossary of Terms <ul><li>AED Automated External Defibrillator – Auto diagnosis with voice directed treatment. </li></ul><ul><li>EKG/ECG ElectroCardioGram – skin surface, heart monitor </li></ul><ul><li>Holter Monitor Portable device for continuously monitoring the electrical activity of the heart for at least 24 hours. Can be external or implantable. </li></ul><ul><li>Defibrillation Delivering a therapeutic dose of electrical energy to the heart. </li></ul><ul><li>T-wave alterans A change in the shape of the heartbeat signal on an every other beat basis that is not apparent to the naked eye. </li></ul><ul><li>Right Leg Drive An operational amplifier deriving common mode voltage is used to invert the common-mode signal and drive it back into the patient through the right leg. </li></ul><ul><li>RFI Radio Frequency Interference </li></ul><ul><li>ESD Electro Static Discharge </li></ul>
  3. 3. ECG Markets ECG Professional Healthcare Consumer Diagnostic Above Diagnostic AED Defibrillators Commercial Fitness Equipment Home Products line battery line battery Holter Monitor
  4. 4. ECG Waveform (Filtered)
  5. 5. ECG – Waveform Characteristics <ul><li>ECG Signals have two components: </li></ul><ul><ul><li>ECG Waveform </li></ul></ul><ul><ul><ul><li>0.05 Hz to 150 Hz bandwidth per Medical Standards </li></ul></ul></ul><ul><ul><ul><li>Average R Wave Amplitude is 1.8mV </li></ul></ul></ul><ul><ul><ul><li>Some waveforms can be as big as 10 mV p-p. </li></ul></ul></ul><ul><ul><ul><li>T wave Alterans are only a few microvolts in amplitude </li></ul></ul></ul><ul><ul><li>Pacing Artifact </li></ul></ul><ul><ul><ul><li>Medical Standards require 2mV and 200 µs detection </li></ul></ul></ul><ul><ul><ul><li>Average pulse is 1 mV and 500µs but can be much smaller </li></ul></ul></ul>
  6. 6. ECG – Patient Skin Surface Characteristics <ul><li>Skin Impedance </li></ul><ul><ul><li>Standards require of common mode rejection at 51K ohms skin to electrode impedance at 10Hz </li></ul></ul><ul><ul><li>Good Silver-Silver Chloride electrodes yield about 10 K ohm electrode to skin impedance </li></ul></ul><ul><ul><li>Stainless Steel electrodes can yield skin impedances of several meg-ohms </li></ul></ul><ul><li>Defibrillation Voltage </li></ul><ul><ul><li>5000 volts, 360 Joules </li></ul></ul><ul><li>DC Voltage </li></ul><ul><ul><li>Medical Standards require being capable of acquiring ECG with 300 mV of DC. Mostly due to half cell potential of electrodes, stainless steel can yield 500 mV of DC </li></ul></ul><ul><li>60 Hz Noise </li></ul><ul><ul><li>Average is several mV </li></ul></ul>
  7. 7. Signal Chains
  8. 8. Diagnostic ECG (Clinical Use)
  9. 9. Diagnostic ECG In-amp + Right Leg Drive
  10. 10. Diagnostic ECG Filters + Pace Detection
  11. 11. Diagnostic ECG ADC + Isolation + Processing
  12. 12. Low Power, Low Cost, Wireless ECG (Holter Monitor)
  13. 13. Low Cost, Low Power AED
  14. 14. Exercise Heart Rate Monitor (Example: treadmill with heart rate monitor)

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