著者

石田 開 花田 英輔 加納 隆 廣瀬 稔

出版者

一般社団法人日本医療機器学会

雑誌

医療機器学 (ISSN:18824978)

巻号頁・発行日

vol.85, no.3, pp.336-342, 2015 (Released:2015-09-11)

参考文献数

12

被引用文献数

1

著者

石田 開 鈴木 啓太 花田 英輔 廣瀬 稔

出版者

一般社団法人日本医療機器学会

雑誌

医療機器学 (ISSN:18824978)

巻号頁・発行日

vol.87, no.3, pp.324-331, 2017 (Released:2017-08-02)

参考文献数

14

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Light Emitting Diode (LED) lamps have become widespread in the clinical settings. However, electromagnetic noise from LED lamps could be problematic. In hospitals, the reception level of signals from medical telemeters might decrease after replacing traditional lighting with LED lamps. To investigate the effects of noise radiated from LED lamps on medical telemeters, we measured the electric field intensity of 34 types of LED lamps. Many of them emit 400 MHz band noise, and some types of LED lamps had increased floor level noise of 30 dB. We also observed artifact noises on electrocardiogram and respiratory waveforms when an LED lamp was placed next to the patient monitor. This effect was observed only when a medical telemeterʼs transmitter and a LED lamp were placed quite close. When approximately 50 cm apart, patient monitorsʼ signals were received normally. In hospitals, AC power supply cables and lamps are often placed near transmission cables, including leaky coaxial cables (LCX), as antenna of the patient monitors. To prevent interference with medical telemeters, selecting low noise LED lamps and maintaining sufficient separation between LED lamps and receiving antennas or LCX is necessary.

著者

廣瀬 稔 塚尾 浩

出版者

一般社団法人日本医療機器学会

雑誌

医療機器学 (ISSN:18824978)

巻号頁・発行日

vol.88, no.1, pp.48-53, 2018 (Released:2018-03-27)

参考文献数

6

被引用文献数

1

著者

石田 開 廣瀬 稔 池田 憲昭

出版者

一般社団法人日本医療機器学会

雑誌

医療機器学 = The Japanese journal of medical instrumentation (ISSN:18824978)

巻号頁・発行日

vol.83, no.1, pp.13-21, 2013-02-01

参考文献数

29

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Cell-phones have a possibility to interfere with medical equipment, and using a cell-phone is restricted in some or all areas in many medical institutions. Cell-phone jamming equipment (CJE) has been introduced in critical areas to prevent cell-phone use. The CJE that were developed for medical use will not interfere with medical equipment nor other communication systems. There are many such devices that one can easily get on the internet or by mail order. This study investigated the malfunction of irradiated medical equipment and Wireless LAN (WLAN) by that type of CJE. We investigated 20 medical devices and 3 WLAN routers. The CJE interfered with four types of medical equipment and all WLAN routers that were investigated. One syringe pump raised an occlusion alarm and stopped infusion at a maximum distance of 22 cm from the CJE. One WLAN router was disconnected at a maximum distance of 6.2 meter. The maximum interference distance of medical equipment was comparatively smaller than that of the WLAN routers. Therefore, serious malfunction of medical equipment by CJE is probably not threatening. However, the malfunction of WLAN might affect clinical work using networks, because some WLAN routers or communication systems were susceptible to interference by CJE.

著者

石田 開 廣瀬 稔 池田 憲昭

出版者

一般社団法人日本医療機器学会

雑誌

医療機器学 (ISSN:18824978)

巻号頁・発行日

vol.83, no.1, pp.13-21, 2013 (Released:2013-07-19)

参考文献数

29

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Cell-phones have a possibility to interfere with medical equipment, and using a cell-phone is restricted in some or all areas in many medical institutions. Cell-phone jamming equipment (CJE) has been introduced in critical areas to prevent cell-phone use. The CJE that were developed for medical use will not interfere with medical equipment nor other communication systems. There are many such devices that one can easily get on the internet or by mail order. This study investigated the malfunction of irradiated medical equipment and Wireless LAN (WLAN) by that type of CJE. We investigated 20 medical devices and 3 WLAN routers. The CJE interfered with four types of medical equipment and all WLAN routers that were investigated. One syringe pump raised an occlusion alarm and stopped infusion at a maximum distance of 22 cm from the CJE. One WLAN router was disconnected at a maximum distance of 6.2 meter. The maximum interference distance of medical equipment was comparatively smaller than that of the WLAN routers. Therefore, serious malfunction of medical equipment by CJE is probably not threatening. However, the malfunction of WLAN might affect clinical work using networks, because some WLAN routers or communication systems were susceptible to interference by CJE.