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Medical applications-ecg
 

Medical applications-ecg

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    Medical applications-ecg Medical applications-ecg Presentation Transcript

    • Medical Applications Electrocardiogram (ECG)
    • Glossary of Terms
      • AED Automated External Defibrillator – Auto diagnosis with voice directed treatment.
      • EKG/ECG ElectroCardioGram – skin surface, heart monitor
      • Holter Monitor Portable device for continuously monitoring the electrical activity of the heart for at least 24 hours. Can be external or implantable.
      • Defibrillation Delivering a therapeutic dose of electrical energy to the heart.
      • 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.
      • 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.
      • RFI Radio Frequency Interference
      • ESD Electro Static Discharge
    • ECG Markets ECG Professional Healthcare Consumer Diagnostic Above Diagnostic AED Defibrillators Commercial Fitness Equipment Home Products line battery line battery Holter Monitor
    • ECG Waveform (Filtered)
    • ECG – Waveform Characteristics
      • ECG Signals have two components:
        • ECG Waveform
          • 0.05 Hz to 150 Hz bandwidth per Medical Standards
          • Average R Wave Amplitude is 1.8mV
          • Some waveforms can be as big as 10 mV p-p.
          • T wave Alterans are only a few microvolts in amplitude
        • Pacing Artifact
          • Medical Standards require 2mV and 200 µs detection
          • Average pulse is 1 mV and 500µs but can be much smaller
    • ECG – Patient Skin Surface Characteristics
      • Skin Impedance
        • Standards require of common mode rejection at 51K ohms skin to electrode impedance at 10Hz
        • Good Silver-Silver Chloride electrodes yield about 10 K ohm electrode to skin impedance
        • Stainless Steel electrodes can yield skin impedances of several meg-ohms
      • Defibrillation Voltage
        • 5000 volts, 360 Joules
      • DC Voltage
        • 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
      • 60 Hz Noise
        • Average is several mV
    • 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)