Rad-67
Chapter 1: Technology Overview
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Rad-67 uses a multi-wavelength sensor to distinguish between oxygenated blood,
deoxygenated blood, blood with carbon monoxide, oxidized blood and blood plasma.
Rad-67 utilizes a sensor with various light-emitting diodes (LEDs) that pass light through
the site to a diode (detector). Signal data is obtained by passing various visible and infrared
lights (LEDs, 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 ≤ 25 mW. The detector receives the light, converts it into an electronic signal and
sends it to the Rad-67 for calculation.
1.
Light Emitting Diodes
(LEDs)
(7 + wavelengths)
2.
Detector
Once Rad-67 receives the signal from the sensor, it utilizes proprietary algorithms to
calculate the patient’s functional oxygen saturation (SpO
2
[%]), total hemoglobin
concentration (SpHb [g/dL]) and pulse rate (PR). The SpHb measurements rely on a multi-
wavelength calibration equation to quantify the percentage of carbon monoxide and
methemoglobin and the concentration of total hemoglobin in arterial blood. Maximum skin-
sensor interface temperature was tested to be less than 41º C (106º F) in a minimum
ambient temperature of 35º C (95º F). The tests were conducted with sensors operating at
reasonable worst case power.
