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Section 1
The OXYPLETH
designed to be used in a variety of clinical settings. It provides reliable measurement, display, and alerts,
for functional pulsatile oxygen saturation (SpO
Indications and Usage
The Model 520A is intended to be used for monitoring oxygen saturation and pulse rate in all critical
monitoring environments including ventilatory support and anesthesia. It is designed to monitor all
patient areas including adult, pediatric and neonatal.
Per requirements of IEC 601-1, the Model 520A is classified as class II equipment, with type BF applied
part, and an enclosure protection rating of IPX0.
SpO
2
The Model 520A measures oxygen saturation and pulse rate with sensors that contain red and infrared
light sources, called Light Emitting Diodes (LEDs). Because oxygen saturated blood absorbs different
amounts of light at each wavelength (red and infrared) as compared to unsaturated blood, the amount
of light absorbed by the blood in each pulse can be used to calculate oxygen saturation.
The light energy from red (660 nm) and infrared (940 nm) LEDs is beamed through a sample cell—a
pulsating vascular bed, the patient's finger or toe for example. The remaining light energy not absorbed
by the sample cell reaches a light receptor, called a photodiode, on the opposing side of the sensor. The
data received at the photodiode is sent back to the monitor where it is split into its red and infrared
components, digitized, processed by a microprocessor chip, and finally displayed as a numerical value
for oxygen saturation and a plethysmogram.
The Model 520A is calibrated to display "functional" saturation. This differs from the "fractional"
saturation value displayed by most co-oximeters.
Functional saturation represents 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.
Pulse Rate is calculated by measuring the time interval between the peaks of the infrared light
waveform. The inverse of this measurement is displayed as pulse rate.
The Model 520A must be used in conjunction with SuperBright™ saturation sensors. An INCOMPATIBLE
PROBE display message indicates a non-SuperBright™ Sensor is in use.
Rev. 04
®
Pulse Oximeter Monitor, Model 520A
Principles of Operation
Functional Saturation =
HbO
= Fractional Hemoglobin
2
COHb = Carboxyhemoglobin
METHb = Methemoglobin
is a lightweight, easy to use pulse oximeter,
,
) and pulse rate.
2
HbO
2
100 - (COHb + METHb)
OXYPLETH
Introduction
®
User's Manual
1
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