Fujiwara Shigeki, Tachihara Keiichi, Mori Satoshi, Ouchi Kentaro, Yokoe Chizuko, Imaizumi Uno, Morimoto Yoshinari, Miki Yoichiro, Toyoguchi Izumi, Yoshida Kazu-Ichi, Yokoyama Takeshi
Department of Anesthesiology, Graduate School of Dentistry, Kanagawa Dental University, 82 Inaoka-cho, Yokosuka-shi, Kanagawa, 238-0003, Japan.
Department of Dental Anesthesiology, Faculty of Dental Science, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka, 812-8582, Japan.
J Clin Monit Comput. 2016 Dec;30(6):925-931. doi: 10.1007/s10877-015-9795-3. Epub 2015 Oct 14.
Blood pressure transducer kits are equipped with two types of Planecta™ ports-the flat-type Planecta™ port (FTP) and the Planecta™ port with a three-way stopcock (PTS). We reported that FTP application decreased the natural frequency of the kits. However, Planecta™ is an invaluable tool as it prevents infection, ensures technical simplicity, and excludes air. Hence, an ideal Planecta™ port that does not decrease the frequency characteristics is required. As a first step in this direction, we aimed to assess the influence of PTSs on the natural frequency of blood transducer kits. A DTXplus transducer kit (DT4812J; Argon Medical Devices, TX, USA) was used along with ≥1 PTSs (JMS, Hiroshima, Japan), and the frequency characteristics were assessed. The natural frequency and damping coefficient of each kit were obtained by using frequency characteristics analysis software, and these parameters were evaluated by plotting them on Gardner's chart. Regardless of whether one or two PTSs were inserted, the natural frequency of the kits only slightly decreased (from 42.5 to 41.1 Hz, when 2 PTSs were used). Thus, the frequency characteristics of the kits with PTSs were adequate for pressure monitoring. The insertion of ≥2 FTPs in pressure transducer kits should be avoided, as they markedly decrease the natural frequency and lead to underdamping. However, the effect of PTS insertion in pressure transducer kits on the frequency characteristics is minimal. Thus, we found that the use of PTS markedly improved the frequency characteristics as compared to the use of FTP.
血压传感器套件配备了两种类型的Planecta™端口——扁平型Planecta™端口（FTP）和带三通旋塞的Planecta™端口（PTS）。我们曾报道，应用FTP会降低套件的固有频率。然而，Planecta™是一种非常有价值的工具，因为它能预防感染、确保技术操作简便且能排除空气。因此，需要一种不会降低频率特性的理想Planecta™端口。作为朝这个方向迈出的第一步，我们旨在评估PTS对血液传感器套件固有频率的影响。使用了一个DTXplus传感器套件（DT4812J；美国德克萨斯州的氩气医疗设备公司）以及≥1个PTS（日本广岛的JMS公司生产），并对频率特性进行了评估。通过使用频率特性分析软件获得每个套件的固有频率和阻尼系数，并将这些参数绘制在加德纳图表上进行评估。无论插入一个还是两个PTS，套件的固有频率仅略有下降（使用2个PTS时，从42.5赫兹降至41.1赫兹）。因此，带有PTS的套件的频率特性足以用于压力监测。应避免在压力传感器套件中插入≥2个FTP，因为它们会显著降低固有频率并导致欠阻尼。然而，在压力传感器套件中插入PTS对频率特性的影响最小。因此，我们发现与使用FTP相比，使用PTS能显著改善频率特性。
