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Mobile communication devices causing interference in invasive and noninvasive ventilators.

Bao P Dang¹, Pierre R Nel, John A Gjevre

¹Division of Respirology, Department of Internal Medicine, Royal University Hospital, University of Saskatchewan, Saskatoon, Saskatchewan, Canada.

Journal of Critical Care

|June 6, 2007

Summary

Mobile communication devices like cell phones and 2-way radios are safe for use near mechanical ventilators. Interference only occurs at very close distances, less than 1 meter, with most devices posing no risk.

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Area of Science:

Biomedical Engineering
Medical Device Safety
Electromagnetic Compatibility

Background:

Mechanical ventilators are critical life support devices.
Potential electromagnetic interference (EMI) from mobile communication systems is a concern for medical equipment.
Assessing EMI is crucial for patient safety in healthcare settings.

Purpose of the Study:

To evaluate potential interference of mobile communication systems on mechanical ventilators.
To determine the distances at which such interference may occur.

Main Methods:

Tested various invasive and noninvasive ventilatory devices, including adult, portable, and pediatric ventilators.
Operated 2 cellular systems (Global Systems for Mobile Communication and Time Division Multiple Access) and 1 2-way radio system.
Tested devices at varying distances from ventilators, starting at 0 meters, across all operational modes.

Main Results:

The 2-way radio caused the most interference, with effects noted up to 1.0 meter.
Global Systems for Mobile Communication caused significant interference only at 0 meters and minor interference at 0.5 meters on one device.
Time Division Multiple Access caused no interference. Significant interference included drastic, unrecoverable changes in respiratory rate and pressure.

Conclusions:

Mobile communication devices are generally safe for use near mechanical ventilators.
Interference is unlikely unless devices are operated at extremely close distances (less than 1 meter).
This finding supports the safe co-location of mobile communication technology and mechanical ventilation in clinical environments.