Static magnetic field measurements of smart phones and watches and applicability to triggering magnet modes in implantable pacemakers and implantable cardioverter-defibrillators

Abstract

Overview

The increasing use of smart devices like phones and watches has raised concerns regarding their potential to disrupt medical devices. This study specifically investigates the magnetic fields generated by consumer electronics and their effect on the functionalities of implantable pacemakers and ICDs.

Background

Implantable devices such as pacemakers and ICDs often come equipped with a "magnet mode", which can be activated by magnetic fields greater than 10 G. This mode is crucial during procedures susceptible to electromagnetic interference or when it's necessary to suspend tachycardia detection and therapy.

Objective

The research aims to establish safe distances between smart devices and implantable medical devices to avoid unintended triggering of magnet mode.

Methods

• Measurement of static magnetic fields from iPhone 12 models and Apple Watch using an FW Bell 5180 Gauss Meter.
• Detailed distances and field strength assessment in close proximity.

Findings

It was observed that the iPhone 12 and Apple Watch 6 models produce magnetic fields significantly higher than 10 G when within 1-11 mm proximity, decreasing below this threshold at further distances.

Conclusion

These findings support FDA recommendations to maintain a safe distance (at least 6 inches) between consumer electronics and implantable medical devices to mitigate health risks associated with electromagnetic interference.