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Fiber Optic Pressure
previous calibration parameters written to the EEPROM memory are automatically used
to make the pressure measurement.
Inserting the fiber optic pressure sensor
The fiber optic sensor can be inserted at any location where a 22 gauge catheter can be
inserted. One of the most common placements of the sensor is in the tail artery of a rat
to make continuous real time blood pressure measurements.
In the case where the pressure sensor is inserted into a rats tail artery, the tail is first
heated, usually in warm water, and a catheter is inserted in the tail artery. The fiber
optic sensor is carefully inserted through a Tuohy Borst Adapter and then into the
catheter. The Tuohy Borst Adapter is connected to the catheter and then the adapter
nd
gland is tightened around the jacket of the sensor to form a seal. A catheter with a 2
nd
port (IVC-22B) as shown on page 17-1 or a catheter without a 2
port (IVC-22A) but
with a 3 way stop cock allows heparinized saline to periodically flush the transducer to
eliminate clotting.
PC-sam's main display
The IBP waveform obtained from the fiber optic pressure sensor in a rat's tail artery is
shown below. Note the IBP2 gates are displayed in the Cardio Sweep display. The
heart rate and peak to peak period are displayed to the right of the waveform. The
systolic, diastolic and mean arterial pressures are computed and displayed below the
waveform.
Revision C, August 2013
13
6
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