Introduction
1-8 Operator's Manual
Caution:
For cerebral site selection, do not place the sensor over nevi, sinus cavities, the superior sagittal
sinus, subdural or epidural hematomas or other anomalies such as arteriovenous malformations,
as this may cause readings that are not reflective of brain tissue or no readings at all.
Caution:
For somatic site selection, avoid placing the sensor over thick fatty deposits, hair or bony
protuberances. Do not place the sensor over nevi, hematomas or broken skin, as this may cause
readings that are not reflective of somatic tissue or no readings at all.
Caution:
Use only Covidien recommended or provided accessories. Use of the INVOS™ system with any
other sensor will compromise accuracy.
Caution:
If present, the following may cause inaccurate readings:
• Cardiogreen, Indigo Carmine, Methylene Blue, or other intravascular dyes
• Carboxyhemoglobin or other dyshemoglobins
• Hemoglobinopathies
• Conjugated hyperbilirubinemia (direct)
• Myoglobin (Mb) in muscle tissues
Caution:
Do not place the sensor on regions with severe tissue edema to reduce the possibility of skin
lesions.
Caution:
Use of an electrosurgical/electrocautery instrument in the vicinity of the INVOS™ system may
interfere with the signal and result in no readings and the status message “INTERFERENCE
DETECTED.”
Caution:
Environments with excessive ambient light such as bright sunlight or strong operating room
lighting may require loosely covering the area of the sensor with an opaque drape.
Caution:
In order to maintain full backup battery charge, the INVOS™ system must be plugged into AC
mains power with the back panel AC mains power switch turned on. The blue LED on the key
panel illuminates to indicate the power is connected and the battery is charging. Periodically
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