1-6 Rad-57 Signal Extraction Pulse CO-Oximeter Operator’s Manual
1
PRINCIPLE OF OPERATION
Pulse oximetry is governed by the following principles:
1. Oxyhemoglobin (oxygenated blood), deoxyhemoglobin (non-oxygenated blood),
carboxyhemoglobin (blood with carbon monoxide content) and methemoglobin
(blood with oxidized hemoglobin content) species differ in their absorption of visible
and infrared light (using spectrophotometry, see figure below).
2. The amount of arterial blood in tissue changes with your pulse (photoplethysography).
Therefore, the amount of light absorbed by the varying quantities of arterial blood
changes as well.
The Rad-57 Pulse CO-Oximeter uses a multi-wavelength sensor to distinguish between
oxygenated blood, deoxygenated blood, blood with carbon monoxide content and blood
with oxidized hemoglobin. The 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 22mW. 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, blood
levels 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 and methemoglobin in arterial blood. The maximum of
the skin surface temperature is measured at an ambient temperature of less than 106º F
(41º C). This is verified by Masimo sensor skin temperature test procedures.
* See Model Summary for applicable device.
overview
Rad-57cm Signal Extraction Pulse CO-Oximeter Operator’s Manual
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Wavelength (nm)
Absorption (mm-1)
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