User's Manual

1-6
Rad-87 Pulse CO-Oximeter Operator’s Manual
1
Overview
Principle of Operation
Pulse CO-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) and blood plasma constituents differ in their absorption of visible and
infrared light (using spectrophotometry, see figure below).
Carboxyhemoglobin
Oxyhemoglobin
Methemoglobin
Deoxyhemoglobin
Absorption Spectra
Plasma
Absorption (1/mm)
0
0.5
600 800
1.0
1.5
2.0
2.5
3.0
3.5
4.0
1000 1200 1400 1600
Wavelength (nm)
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-87 Pulse CO-Oximeter uses a multi-wavelength sensor to distinguish between
oxygenated blood, deoxygenated blood, blood with carbon monoxide, oxidized blood and blood
plasma. The Rad-87 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 1400nm) 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-87 for calculation.
Once the Rad-87 receives the signal from the sensor, it utilizes Masimo Rainbow SET signal
extraction technology to calculate the patient’s functional
arterial 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. In an ambient temperature of 35º C the
maximum skin surface temperature has been measured at less than 106º F (41º C), verified by
Masimo sensor skin temperature test procedure.
2
1
1. Light Emitting Diodes (LEDs)
( 7+ wavelengths )
2. Detector