introductionchapter 1 1-3
If, upon reading this manual, you nd that you need clarication or additional informa-
tion, you can direct questions to your local Terumo Cardiovascular Systems represen-
tative, or to:
Terumo Cardiovascular Systems
6200 Jackson Road, Ann Arbor, MI 48103 USA
Phone: (800) 521-2818
Conventions
This manual contains important warnings, cautions, and notes:
Warning
• Warnings like this alert you to safety issues with the CDI System 550.
You must read these warnings before using the CDI System 550.
Caution
• Cautions contain important information about the operation and
maintenance of the CDI System 550. Read these carefully in order to avoid
any problems.
Note: Notes contain information that help with the operation of the CDI System 550.
How the CDI System 550 works
The CDI System 550 is an AC-powered, microprocessor-based monitor. It uses an
optical uorescence technology to measure blood gases, pH, and potassium. In addi-
tion, it uses an optical reectance technology to measure oxygen saturation, hemato-
crit, and hemoglobin.
Optical uorescent measurement. Two cable assemblies, one Arterial and one
Venous (Optional) connect the monitor to disposable CDI Shunt Sensors which are
inserted into the extracorporeal circuit. The CDI Shunt Sensors contain uorescent
microsensors, which are the heart of the CDI System 550 measurement system.
Light emitting diodes (LEDs) in the cable-heads direct light pulses towards the micro-
sensors.
The microsensors are composed of uorescent chemicals that emit light in response
to the stimulating pulses. The intensity of the emitted light depends upon the concen-
trations of potassium, oxygen, carbon dioxide and hydrogen ions coming into contact
with the microsensors. The light emitted by the uorescent microsensors is returned
to the cable-heads and measured by a light detector. The output signal of the detec-
tor is converted by the microprocessor to numerical data, which is displayed on the
monitor’s screen.
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