Fujiwara Shigeki, Kawakubo Yoshifumi, Mori Satoshi, Tachihara Keiichi, Toyoguchi Izumi, Yokoyama Takeshi
Department of Dental Anesthesiology, Faculty of Dental Science, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka, 812-8582, Japan.
Argon Medical Devices Japan, Davinchi-Ningyocho 6F, 2-13-9 Nihonbashi-ningyochou, Chuo-ku, Tokyo, 103-0013, Japan.
J Clin Monit Comput. 2015 Dec;29(6):681-9. doi: 10.1007/s10877-014-9650-y. Epub 2014 Dec 17.
Pressure-transducer kits have frequency characteristics such as natural frequency and damping coefficient, which affect the monitoring accuracy. The aim of the present study was to investigate the effect of planecta ports and a damping device (ROSE™, Argon Medical Devices, TX, USA) on the frequency characteristics of pressure-transducer kits. The FloTrac sensor kit (Edwards Lifesciences, CA, USA) and the DTXplus transducer kit (Argon Medical Devices) were prepared with planecta ports, and their frequency characteristics were tested with or without ROSE™. The natural frequency and damping coefficient of each kit were obtained using frequency characteristics analysis software and evaluated by plotting them on the Gardner's chart. By inserting a planecta port, the natural frequency markedly decreased in both the FloTrac sensor kit (from 40 to 22 Hz) and the DTXplus transducer kit (from 35 to 22 Hz). In both kits with one planecta port, the damping coefficient markedly increased by insertion of ROSE™ from 0.2 to 0.5, optimising frequency characteristics. In both kits with two planecta ports, however, the natural frequency decreased from 22 to 12 Hz. The damping coefficient increased from 0.2 to 0.8 by insertion of ROSE™; however, optimisation was not achieved even by ROSE™ insertion. Planecta ports decrease the natural frequency of the kit. ROSE™ is useful to optimise the frequency characteristics in the kits without or with one planecta port. However, optimisation is difficult with two or more planecta ports, even with the ROSE™ device.
压力传感器套件具有诸如固有频率和阻尼系数等频率特性，这些特性会影响监测精度。本研究的目的是探讨平面端口和一种阻尼装置（ROSE™，美国德克萨斯州阿贡医疗设备公司）对压力传感器套件频率特性的影响。将平面端口安装到弗洛泰克（FloTrac）传感器套件（美国加利福尼亚州爱德华兹生命科学公司）和DTXplus传感器套件（阿贡医疗设备公司）上，并在有或没有ROSE™的情况下测试它们的频率特性。使用频率特性分析软件获取每个套件的固有频率和阻尼系数，并通过将它们绘制在加德纳图表上进行评估。通过插入平面端口，弗洛泰克传感器套件（从40赫兹降至22赫兹）和DTXplus传感器套件（从35赫兹降至22赫兹）的固有频率均显著降低。在两个带有一个平面端口的套件中，插入ROSE™后，阻尼系数从0.2显著增加到0.5，优化了频率特性。然而，在两个带有两个平面端口的套件中，固有频率从22赫兹降至12赫兹。插入ROSE™后，阻尼系数从0.2增加到0.8；然而，即使插入ROSE™也未实现优化。平面端口会降低套件的固有频率。ROSE™有助于优化没有平面端口或带有一个平面端口的套件的频率特性。然而，即使使用ROSE™装置，对于两个或更多平面端口也难以实现优化。
