IBP Monitoring
15-18
15.6.3 Calibration and Zeroing
Calibration
The ICT/B is supplied with a minimal zero offset and the sensitivity is set at 5
uV/V/mmHg. To ensure accurate settings of the amplifier and recorder, the controls
should be zeroed at ambient pressure and then calibrated at a known pressure. For
instance, use the calibration tube, syringe and manometer, or immerse it into a
known depth of water column and then set the gain of the system to the required
level. The procedure above should be performed once again to verify the zero
baseline does not changed due to the gain change.
Tighten the collet on the calibration tube over the sliding calibration sleeve to seal
the ICT/B catheter. Use a male luer fitting to form a connection to a reference
pressure, such as a syringe and manometer. The output of the transducer and
amplifier system can be reliably and quickly confirmed.
Figure 15-14 ICT/B Calibration
Zeroing
îš„ Checking the Zero when the ICT/B is in the Epidural Space
Using a 1ml syringe, inject approximately 0.3cc of air into the female luer connector
on the proximal end of the ICT/B. Leave the syringe attached and note the value on
the pressure monitor or scope. The ICP will decrease to zero or a value very close to
it. If the monitor/transducer combination has drifted from zero, reset the zero control
to zero value on the meter. Remove the syringe and the monitor will immediately
begin to measure intracranial pressure.
Monitor
Manometer
Syringe
Calibration tube
Use a 1ml syringe to inflate the balloon fo
zero check. Luer fitting must be open to
ambient pressure during normal operation
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