Blood pressure measurement system using NI myDAQ


Objection: using pressure sensor and NI myDAQ to measure blood pressure on PC.

Theory: When adding pressure to arm with band around, pulse will be cut off when pressure is too high. If the pressure is lower, the pulse becomes clear, then gently fades away. The point when pulse sound becomes clear is the diastolic blood pressure (DBP), and the point when pulse sound begins to fade away is the Systolic blood pressure(SBP). We amplify and analyze the pulse sound so that the blood pressure can be measured. With the help of LabVIEW and myDAQ, the signal can be digitized and further processed on PC.

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Pictures showing the theory

Design 

We used PT14 as pressure sensor, but the signal was quite low in voltage, so we used AD620 as amplifier before the signal was sent to myDAQ.

The pressure is converted to voltage then sent to myDAQ, and the pressure is in linear relation to voltage.

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Circuit of sensor and amplifier

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NI myDAQ


We used a blood pressure buzz as calibrator to adjust parameters. After calibration, the LabVIEW result was quite near to the calibrator.


Actual blood  pressure(mmHG)Voltage(V)Calculated Blood pressure(mmHg)Deviation(mmHg)
1162.52481108.42267.577351
681.6604572.5375-4.5375
1102.54984109.46180.538194
621.5366167.39611-5.39611
1122.36664101.85610.14401
701.5815369.261030.738974
1102.72951116.9211-6.92106
701.6559672.35109-2.35109
1122.67176114.5235-2.52349
681.5523368.04875-0.04875
1022.65123113.6712-11.6712
781.6055970.259917.740089
1102.5277108.54261.457368
781.7345775.61472.385299
1102.39776103.1486.852014
621.502665.98413-3.98413




fitting line y=kx+b
k=41.51644b=3.601536

blood pressure calibration


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User interface in LabVIEW

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Equipment

The LabVIEW file: 

血压测量.rar


Reference:

基于虚拟仪器的血压测量.docx

基于虚拟仪器的人体血压测量.docx


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test123: aasdas Details Apr 13 16:39
admin: Thanks! Details Apr 09 11:46
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lqj12: cooooooooool Details Apr 08 21:34
Yunhan Huang: 这个功能是如何实现的? Details Apr 08 13:23