Duo™ Operating Instructions 0070-10-0603-01 2 - 11
Operation Routine Operation
2.3.3.1 Masimo SET
®
SpO
2
The Masimo pulse oximeter determines SpO
2
in the traditional manner of passing red and
infrared light into a capillary bed and measuring changes in light absorption during the
pulsatile cycle. It assumes that arterio-venous shunting is highly variable and that fluctuating
absorbance by venous blood is the major component of noise during the pulse. The Masimo
pulse oximeter calculates the ratio of the arterial signals without the noise.
Masimo SET provides a family of sensors suitable for a wide variety of clinical settings and
patient sizes. All sensors are:
• Indicated for continuous non-invasive monitoring of arterial oxygen saturation (SpO
2
)
and Pulse Rate
• Non-sterile
• Usable during patient movement
The LNOP
®
DCI Adult Reusable Finger Sensor is used for “spot check” applications if
needed. Adhesive-type sensors are also available. Refer to "Accessories" on page 4-1 for
approved sensors. All sensors are intended for “single-patient use only” unless indicated as
“reusable”.
CAUTION: When equipped with Masimo SpO2, use only Masimo
oxygen sensors and cables. Use of other oxygen sensors
may cause improper oximeter performance.
NOTE: Refer to instructions included with each SpO
2
sensor and
cable for proper placement and use.
1. Select an SpO
2
sensor that is appropriate for the size of the patient.
2. Attach the SpO
2
sensor to the patient’s finger.
3. Orient the connector so that the Masimo SET logo is
facing upward. Plug the connector into the SpO
2
receptacle on the front panel of the Duo. The SpO
2
measurement will display when the Duo detects
that the sensor is connected to the patient.
These results are updated once every second and can display for a maximum of 2 minutes
during continuous SpO
2
measurement.
NOTE: To disconnect the cable from the Duo, squeeze the tabs on
the sides of the connector and then pull it straight out.
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