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Electromagnetic compatibility of wireless medical telemetry systems and light-emitting diode (LED) lamps DOI:10.15199/48.2018.02.07

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In Japan, with the increasingly widespread use of lightemitting diodes (LEDs), electrical goods manufacturers have substantially downscaled traditional lighting, such as incandescent electric lamps and fluorescent light tubes. Additionally, the Japanese government has established policies to prohibit the manufacture and importation of traditional lighting by the end of 2020 [1]. Moreover, Baumgartner et al. predicted that LEDs will account for almost 70% of the general lighting market and over 70% of the outdoor and residential lighting markets by 2020 [2]. Therefore, hospitals will be entirely lit by LED lamps in the near future. LED lamps have been widely introduced in clinical settings to save energy and reduction of cost. Until recently, LED lamps were more expensive than traditional lighting devices, but their prices have gradually decreased. Additionally, the introduction of LED lamps reduces the total operating cost. In hospitals, in addition to room lighting, LEDs are used for shadowless lamps, oral cavity lighting, and lighting goggles used in operations. However, electromagnetic interference (EMI) by LED lamps has been reported. In 2010, poor reception of analogue television and radio broadcasting signals occurred after the installation of LED lamps along shopping streets in north-eastern Japan [3]. In hospitals, EMI with wireless medical telemetry systems may occur. Wireless medical telemetry systems are medical devices that transmit patient vital signs, such as electrocardiograms, respiratory waveforms, blood pressure, electromyograms, and oxygen saturation of arterial blood, to a patient monitor by radio waves. In Japan, the 420 to 450 MHz frequency band and 2.4 GHz band, commonly known as, Industrial, Science and Medical band, "ISM band" are assigned for such use. However, ISM bands are also used for various purposes, such as wireless local area network, microwave oven and cordless phone. To prevent interfer[...]

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