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Electromagnetic Compatibility Issues in 400-MHz-Band Wireless Medical Telemetry Systems and Their Management Using Simplified Methods for Safe Operation

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Abstract 

Wireless medical telemetry systems (WMTSs) are typical radio communication–based medical devices that monitor various biological parameters, such as electrocardiograms and respiration rates. In Japan, the assigned frequency band for WMTSs is 400 MHz. However, the issues accounting for poor reception in WMTS constitute major concerns. In this study, we analyzed the effects of electromagnetic interferences (EMIs) caused by other radio communication systems, the intermodulation (IM) effect, and noises generated from electrical devices on WMTS and discussed their management. The 400-MHz frequency band is also shared by other radio communication systems. We showed the instantaneous and impulsive voltages generated from the location-detection system for wandering patients and their potential to exhibit EMI effects on WMTS. Further, we presented the IM effect significantly reduces reception in WMTS. Additionally, the electromagnetic noises generated from electrical devices, such as light-emitting diode lamps and security cameras, can exceed the 400 MHz frequency band as these devices employ the switched-mode power supply and/or central processing unit and radiate wideband emissions. Moreover, we proposed and evaluated simple and facile methods using a simplified spectrum analysis function installed in the WMTS receiver and software-defined radio for evaluating the electromagnetic environment.

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No datasets were generated or analysed during the current study.

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Funding

This work was supported by JSPS KAKENHI Grant Number JP 23K09591.

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Authors and Affiliations

  1. Department of Materials and Human Environmental Sciences, Faculty of Engineering, Shonan Institute of Technology, Fujisawa, Japan

    Kai Ishida

  2. Department of Clinical Engineering, School of Allied Health Science, Kitasato University, Sagamihara, Japan

    Kiyotaka Fujii

  3. Department of Information Science and Engineering, Faculty of Science and Engineering, Saga University, Saga, Japan

    Eisuke Hanada

Authors
  1. Kai Ishida
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  2. Kiyotaka Fujii
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  3. Eisuke Hanada
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Contributions

Conceptualization: K.I.; Methodology: K.I. and E.H.; Validation: K.I. and K.F.; Formal analysis and investigation: K.I., K.H. and E.H.; Writing—original draft preparation: K.I.; Writing—review and editing: E.H.; visualization: K.I.; Supervision: E.H.; Project aministration: K.I.; Funding acquisition: K.I.; All authors read and approved the final manuscript.

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Correspondence to Kai Ishida.

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Ishida, K., Fujii, K. & Hanada, E. Electromagnetic Compatibility Issues in 400-MHz-Band Wireless Medical Telemetry Systems and Their Management Using Simplified Methods for Safe Operation. J Med Syst 48, 72 (2024). https://doi.org/10.1007/s10916-024-02096-6

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