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Invasive Blood Pressure
IBP transducers have an electrical connection (for the IBP Module), three fluid
connections (for the animal, syringe and/or IV set) and two valves.
A very small
piezoelectric pressure sensor is located in the fluid pathway between the two valves.
Pressure changes caused by the animal's blood in the tubing are converted to electrical
signals by the transducer for display on the monitor.
Each manufacturer of IBP transducers provides detailed instructions for use. Please
refer to those instructions for information in addition to that given below.
Transducer valves
IBP transducers have two valves: a three position stopcock (valve #1) and a normally
closed valve (valve #2).
The three position stopcock valve makes a connection between two of the three ports
while blocking the third. The stopcock lever can be rotated to select which port is
blocked.
The second valve is a normally closed flow through valve. Action by the operator is
required to open the valve. In the case of the Abbott Transpac IV, pressing the plastic
tabs between the thumb and fore finger will open the valve. In the case of the Baxter
Edwards TruWave transducer, pulling the snap tab opens the valve. Note the IBP
transducer manufacturer's instructions should be followed in the event the port attached
to valve #2 is to be connected to an IV set for fluid delivery to the animal.
Animal cannula
A cannula inserted in the animal's vessel will allow blood to enter the blood pressure
tubing. Cannulas can be constructed in a number of ways using needles, tubing and
Leur connectors.
A simple cannula can be made using PE50 tubing and a Leur stub (Harvard Apparatus
part number NP 72-4439 www.harvardapparatus.com). The Leur stub has a female
Leur connection on one end and a short 22 gage metal stub on the other end. The
Revision C, August 2013
10-4
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