Principle Of Operation - Novametrix Medical Systems 8100 User Manual

Principle of operation

Principle of operation
CO
2
CO
2
technique, which has endured and evolved in the clinical setting for over two decades and remains the
most popular and versatile technique today.
The principle is based on the fact that CO
wavelengths, with the amount of energy absorbed being directly related to the CO
an IR beam is passed through a gas sample containing CO
(which measures the remaining light energy) can be obtained. This signal is then compared to the energy
of the IR source and calibrated to accurately reflect CO
photodetector's response to a known concentration of CO
memory. A reference channel accounts for optical changes in the sensor, allowing the system to remain
in calibration without user intervention.
Respiration Rate
The respiration rate is calculated from the flow signal generated whenever a flow or combined CO
sensor is connected to the
a CAPNOSTAT CO
CO
2
the respiratory rate will not be calculated.
SpO
2
The
940 nanometer) light sources, called light emitting diodes (LEDs). The light energy from each LED is
beamed through a tissue sample—a pulsating vascular bed such as the patient's finger or toe. The
remaining light energy not absorbed by the tissue sample reaches a photodiode light receptor in the
sensor. Oxygen saturated blood absorbs different amounts of light at each wavelength as compared to
desaturated blood. Therefore, the amount of light absorbed by the blood in each pulse can be used to
calculate oxygen saturation.
The
saturation value displayed by most co-oximeters. Functional saturation is defined as:
This can be considered to represent the amount of oxyhemoglobin as a percentage of the hemoglobin that
can be oxygenated. Dysfunctional hemoglobins (COHb and METHb) are not included in the
measurement of functional saturation.
Rev. 02
SMO Plus! uses the CAPNOSTAT CO
CO SMO Plus!
2
sensor is connected, then the respiration rate is calculated from the CAPNOSTAT
2
sensor signal. In the event that there is no flow, CO
determines oxygen saturation using sensors that contain red and infrared (660 and
CO SMO Plus!
2
CO SMO Plus! is calibrated to display "functional" saturation. This differs from the "fractional"
2
Functional Saturation =
sensor to measure CO
2
molecules absorb infrared (IR) light energy of specific
2
, the electronic signal from the photodetector
2
concentration in the sample. To calibrate, the
2
is stored at the factory in the monitor's
2
. If a flow or combined CO
/flow, or CAPNOSTAT CO
2
100 - (COHb + METHb)
HbO = Fractional Oxyhemoglobin
2
COHb = Carboxyhemoglobin
METHb = Methemoglobin
General Description
by using the infrared absorbtion
2
concentration. When
2
/flow sensor is not connected, and
2
sensor connected,
2
HbO
2
CO SMO Plus User's Manual
2
/flow
2
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