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Blood Pressure and Sound (1)

Dept. of Biomedical Engineering 2003200449 YOUNHO HONG. Blood Pressure and Sound (1). What kinds of devices?. BP ( Blood Pressure ) Invasive BP ( IBP ) Noninvasive BP ( NIBP ) Tonometry Stethoscope. Tonometry. F=Mg. M. contact area = A. P.

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Blood Pressure and Sound (1)

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  1. Dept. of Biomedical Engineering 2003200449 YOUNHO HONG Blood Pressure and Sound (1)

  2. What kinds of devices? • BP ( Blood Pressure ) Invasive BP ( IBP ) Noninvasive BP ( NIBP ) • Tonometry • Stethoscope

  3. Tonometry F=Mg M contact area = A P P ball P = F/A LED When we blow some air to eye by air ject, The eye will be pressed and then the reflection degree of the light that is from LED will be changed. blow air P air ject eye photo sensor (photo diode or photo TR)

  4. NIBP (noninvasive blood pressure) Cuff Cuff Pressure Pa (arterial pressure) (systolic pressure) 120mmHg We can’t measure the wave precisely by NIBP. 90mmHg (diastolic pressure) t

  5. NIBP (noninvasive blood pressure) P (systolic pressure) 120mmHg 180mmHg slope (-2 ~ -3 mmHg/s) 90mmHg (diastolic pressure) Cuff pressure korotkoff sound Threshold t “ Oscillometric Method” As cuff pressure is getting smaller, the pressure that sensor measures is getting bigger at first. And then the pressure is getting smaller in the middle until cuff pressure reachs to the diastolic pressure.

  6. Phase-Sensitive Demodulation # From Problem 8 (HW2) (1) Add noise Cn to x(t). And do phase-sensitive demodulation.

  7. Phase-Sensitive Demodulation

  8. Phase-Sensitive Demodulation (2) Add random noise to x(t). And do phase-sensitive demodulation.

  9. Phase-Sensitive Demodulation

  10. Thank You.

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