Principles Of Operation - Masimo SET Rainbow SET Rad-57 Operator's Manual

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Principles of Operation
Pulse oximetry is governed by the following principles:
1. Oxyhemoglobin (oxygenated blood), deoxyhemoglobin (non-oxygenated blood),
carboxyhemoglobin (blood with carbon monoxide content), methemoglobin (blood with oxidized
hemoglobin)
(using spectrophotometry, see figure below).
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
GRAPHIC DOCUMENTATION AND APPRO VAL
Approvals Date
2. The amount of arterial blood in tissue changes with your pulse (photoplethysography). Therefore,
10/5/04
the amount of light absorbed by the varying quantities of arterial blood changes as well.
Title
The Rad-57 Pulse CO-Oximeter uses a multi-wavelength sensor to distinguish between oxygenated
blood, deoxygenated blood, blood with carbon monoxide, oxidized blood and
Graphic, LED/Photo Detector Placment
Rad-57 utilizes a sensor with various light-emitting diodes (LEDs) that pass light through the site
to a photodiode (detector). See figure below. Signal data is obtained by passing various visible and
infrared lights (LED's, 500 to 1000nm) through a capillary bed (for example, a fingertip, a hand, a
foot) and measuring changes in light absorption during the blood pulsatile cycle. This information
may be useful to clinicians. The maximum radiant power of the strongest light is rated at ≤ 25mW.
The detector receives the light, converts it into an electronic signal and sends it to the Rad-57 for
calculation.
Once the Rad-57 receives the signal from the sensor, it utilizes Masimo Rainbow SET signal
extraction technology to calculate the patient's functional oxygen saturation
of carboxyhemoglobin (SpCO*), methemoglobin (SpMet*) and pulse rate. The SpCO and SpMet
measurements rely on a multiwavelength calibration equation to quantify the percentage of: carbon
monoxide or
measured at an ambient temperature of less than 106º F (41º C). This is verified by Masimo sensor
skin temperature test procedures.
*available in upgraded Instrument
1-8
and blood plasma constituents
Absorption Spectra
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Approvals
Marketing Communications
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methemoglobin in arterial blood. The maximum of the skin surface temperature is
differ in their absorption of visible and infrared light
Carboxyhemoglobin
Oxyhemoglobin
Methemoglobin
Deoxyhemoglobin
Plasma
GR-13315
DRO-10430
1200 1400
Wavelength (nm)
Date
Program
Adobe Illustrator 10.0 (.eps)
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1. Light Emitting Diodes (LEDs)
(7 + wavelengths)
2. Detector
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FRM 1379 Rev A
DRO 5201
Rad-57 Signal Extraction Pulse CO-Oximeter Operator's Manual
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blood plasma.
(%SpO ), blood levels
2
The