Automatic Calibration of a Device for Blood Pressure Waveform Measurement

Figures

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  Figure 1. A device for blood pressure waveform measurement. A—pneumatic sensor, B—computer interface, C—notebook, D—elastic double-line pneumatic tube.

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  Figure 2. Sensor (2) with connected computer interface (1) and artery segment: A—compressor; B—pressure regulator; E, F, G—orifices; H, I, J, K—shut-off valves; L—sensor body; M—measurement chamber; N—membrane; O—venting gap; C—pressure transducer (Motorola MPX5050 [37]); D—differential pressure transducer (Nenutec 984m.333704 [38]); p1—arterial pressure; p2—pressure readout by the main pressure transmitter; ps—output pressure from pressure regulator.

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  Figure 3. View of the pneumatic sensor without casing.

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  Figure 4. Individual characteristics determined using two methods: A—method based on the measurements of the systolic pressure ps and the diastolic pressure pd using a cuff monitor, B—method based on the oscillometric measurement of the mean BP values pm using the described device.

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  Figure 5. Oscilloscope printout of the pressure in the sensor measurement chamber: pt—test pressure, pos—oscillatory component of the test pressure.

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  Figure 6. BP waveform curve of a volunteer.