6.6 positioning sensor on patient

For proper monitoring, you’ll need to properly position the sensor on the patient’s head and verify the acquired signal.

1 Step 1 - start monitoring session
2 Step 2 - fill in patient data (optional)
3 Step 3 - position sensor
4 Step 4 - tighten turnbuckle
5 Step 5a - verify signal quality (optional - assisted)
6 Step 5b - verify signal quality (optional - non assisted)

Step 1 - start monitoring session

From the main screen click on new session (1) button to start monitoring session.

TIP - For login instructions and pairing sensor please read section 6.3 logging into app.

main app screen

Step 2 - fill in patient data (optional)

At the beginning of the monitoring session, an optional step is to fill patient data. This information will be used and recorded in the final report. Fill in all data correctly and click on “start monitoring”(1) as shown in Figure 6.5-2

TIP - For faster monitoring, you can choose to skip this step, but for the report to be generated, you will have to fill in the patient information at the end of the monitoring session.

patient information form

Step 3 - position sensor

When starting sensor placement a screen to help with sensor positioning. This will inform you about the headband tightness. Before placing the sensor on the patient's head the option will show that the sensor is too loose.

With the sensor and headband assembled, place them around the patient's head as shown below.

Sensor Placement (B) = The sensor should contact the scalp in the temporoparietal region about 2 inches (5-6 cm) above the entrance of the external acoustic meatus in the coronal plane and just below the head protrusion where the circumference is greatest.

Sensor placement (A) = The sensor must be positioned in the region of the temples (mid eyebrow line), i.e., at 15% of the reference point Fpz towards the Oz reference points at the back of the head following the circumference of the skull.

Step 4 - tighten turnbuckle

Once the sensor is placed, tighten the turnbuckle into a snug, comfortable fit, turning it clockwise until a final click can be heard without excessive force. A proper adjustment will result in a green OK! on the app screen.

If the patient is awake, ask if he is comfortable with the pressure. If not, readjust the headband for a comfortable fit.
In conditions where patients are unresponsive, check for signs of discomfort or skin damage for at least every five minutes.

The app will inform you if placement is too tight or too loose.

Sensor too Lose	Sensor too tight

Sensor too Lose	Sensor too tight
Excessive tightening will be indicated with a “sensor too tight” message. In such a case loosen the turnbuckle until the green message of OK! appears.	Lack of tightening will be indicated with a “sensor too lose” message. In such a case tighten the turnbuckle until the green message of OK! appears.

Step 5a - verify signal quality (optional - assisted)

After sensor placement and tightening an assisted waveform quality window will appear via sample processing according to the table below.

Sample gathering - when correctly positioned, the B4C System will start collecting a 30 second sample of the captured waveform for quality verification
Adequate quality - An average 30 second pulse will be presented with respective confidence intervals and will be updated every 5 seconds.
Inadequate quality - In some situations, the captured signal does not have sufficient technical quality. The system will indicate this, meaning there is a need to stabilize the patient and/or adjust the sensor.

If the sensor is positioned correctly, the waveform shown on the positioning screen should have a typical ICP waveform characteristic.

Step 5b - verify signal quality (optional - non assisted)

After sensor placement and tightening an screen with live waveform will appear for visual verification of the waveform.