Evaluation of Electromagnetic Interference between Critical Medical Devices and New Generation Cellular Phones

Abstract

The electromagnetic emissions from cellular phones and other wireless devices can interfere with the functioning of medical devices when placed in proximity to the devices. Hence, the aim of this study is to evaluate the electromagnetic interference (EMI) between critical medical equipment and second-generation (2G) and third-generation (3G) cellular phones. A total of 10 medical devices were tested, including electrocardiogram (ECG) monitor, ventilator, and two models of defibrillators. The in situ tests were conducted in accordance with the procedures laid out in the American National Standard Institute (ANSI) standard C63.18 for open-site and ad-hoc testing of medical devices. A distortion was observed in the recording of the ECG, treadmill test, and pulse oximeter if either the 2G or 3G cellular phone was kept in proximity during the ringing or conversation modes. Similarly, a noise was generated in the speaker of ultrasonic fetal heart detector whenever 2G or 3G cellular phones were brought closer to it during both modes of operation. However, infusion pump, ventilators, phototherapy unit, and defibrillators were not susceptible to EMI from both the cellular phones.