How to use NI Biomedical Startup Kit 2.0 - NIBP(Noninvasive Blood Pressure) Analyzer

[ZJ.Gu]

NIBP Analyzer

The Noninvasive Blood Pressure (NIBP) Analyzer provides the functionality of noninvasive blood pressure analysis for research purposes.

To use the NIBP Analyzer, you must have the following hardware components:

• NI ELVIS II prototyping board
• Pressure sensor
• Air pump system, including the DC motor and relief valve
• Blood pressure cuff

The following figure illustrates how to assemble the hardware components of the NIBP Analyzer.

Setting Up the NIBP Analyzer Hardware Components

The NIBP Analyzer uses the following channels from NI ELVIS II to measure and control the hardware components.

NI ELVIS II Channel	Component
AI port	Pressure Sensor
Power supply + / –	Air pump
Power supply + / –	Relief valve

After assembling the hardware components of the NIBP Analyzer, complete the following steps to configure the hardware components for use in the NIBP Analyzer.

1. Launch the Noninvasive Blood Pressure (NIBP) Analyzer.
2. Select the NI ELVIS II device name in the Instrument Control section.
3. Click the Settings ... button to display the Set NIBP Parameters... configuration dialog box.
4. Configure the input and output pins on the prototyping board for signal connection according to the previous table. Refer to the Where to Start with NI ELVIS II document, available at ni.com/manuals, for more information about how to set up and configure NI ELVIS II.

After configuring the hardware components to use with the NIBP Analyzer, you can begin to measure blood pressure.

Measuring Blood Pressure

Complete the following steps to measure blood pressure using the NIBP Analyzer.

1. Click the Settings... button to display the Set NIBP Parameters... configuration dialog box.
2. In the Channel Configuration section, specify the channel controls according to the following:
   • Pressure—Specifies the channel of the blood pressure measurement.
   • Sensitivity—Specifies the sensitivity of the pressure sensor in mmHg/mV.
   • Pump Control—Specifies the channel that starts and stops the air pump.
   • Deflation Control—Specifies the channel that opens and closes the relief valve.
3. In the BP Range section, specify the blood pressure controls according to the following:
   • BP Range (High)—Specifies the highest value of the blood pressure search range.
   • BP Range (Low)—Specifies the lowest value of the blood pressure search range.
   • Systolic Threshold—Specifies the computing factor of the systolic pressure from the mean arterial pressure (MAP).
   • Diastolic Threshold—Specifies the computing factor of the diastolic pressure from the mean arterial pressure (MAP).
4. In the Control Parameters section, specify the measurement controls according to the following:
   • Pump Control Voltage—Specifies the drive voltage of the air pump motor. The air pump motor controls the inflation speed of the blood pressure cuff.
   • Deflation Control Voltage—Specifies the drive voltage of the relief valve. The left control specifies the voltage at which this application cuts off the relief valve. The right control specifies the voltage at which this application opens the relief valve. The voltage at which to open the relief valve controls the deflation speed of the blood pressure cuff.
   • Sampling Rate—Specifies the expected sampling rate.
5. Click the OK button to close the Set NIBP Parameters configuration dialog box.
6. Place the left arm through the blood pressure cuff loop and tighten the cuff.
7. Click the Run button to begin the blood pressure measuring process.

   Note  When the inflation and deflation process finishes, the blood pressure measurement process stops automatically. To end the blood pressure measurement process immediately, you can click the Stop button.

The following figure is an example of the results of a blood pressure measurement.

The NIBP Analyzer dialog box displays the real-time blood pressure plot in the top waveform graph. The pulse wave amplitude profile displays in the bottom waveform graph. The estimated blood pressure displays in the top right corner.