1. BLOOD PRESSURE BIOMEDICAL ENGINEERING 2006200401 TAE_EUI, KIM

2. Invasive BP measurement Catheter Dome Diaphragm Strain gages (usually Four) Pressure Sensor Po should be same as Pi “Fluid Mechanics”

3. What affect the quality of Po Catheter length should be shorter but there is Viscosity of liquid Diameter Elastic material for catheter Diaphragm itself should be elastic No air bubble

4. Equivalent Circuit Method of Catheter – Sensor System Electric CircuitFluid Mechanics Voltage, V [v]Pressure, P [pa] Current, i [A](Volume) Flow, f [m3/s] Charge, q [c]Volume, V [m3] R, L, C circuitPhysics things

5. Equivalent Circuit Method of Catheter – Resistance Electrical resistance : Liquid resistance : If viscosity is too big?

6. Equivalent Circuit Method of Catheter – Capacitance or Compliance ( AC flow ) The bigger Compliance, the bigger flow

7. Equivalent Circuit Method of Catheter – Inductance or Innertance

8. Equivalent Circuit Model Catheter Sensor

9. Equivalent Circuit Model Catheter & Sensor are rigid but not diaphragm

10. Equivalent Circuit Model

11. Frequency Transfer Function

12. Magnitude Response

13. Phase Response

14. Reference

15. Steady State Frequency Response

16. ; Principle of Superposition

17. Transient Response ; Principle of Superposition Transient Property! Transient Property!