Takatori Fumihiko, Yamamori Shinji, Inoue Masayuki, Abe Seiki, Miyasaka Katsuyuki
Nihon Kohden Corporation, 1-31-4 Nishiochiai, Shinjuku-ku, Tokyo, Japan.
Annu Int Conf IEEE Eng Med Biol Soc. 2011;2011:1189-92. doi: 10.1109/IEMBS.2011.6090279.
Capnometer has been widely used as a respiratory monitor. Stable carbon dioxide (CO(2)) monitoring of non-intubated patient is especially problematic due to the frequent occurrence of tube obstruction and it could be even more difficult when oxygen is being administered. Oxygen is often administered by an oxygen mask or oxygen nasal cannula; however there are some problems with these methods. For oxygen masks, it is necessary to provide high-flow oxygen to prevent rebreathing of exhaled CO(2), and as for oxygen nasal cannula, it is incapable of increasing the oxygen concentration and patient may feel uncomfortable during oxygen administration because it could dry nasal mucous. To solve these problems, we developed a novel mainstream capnometer system, which provides stable monitoring of exhaled CO(2) while administering oxygen. This capnometer system has a mask with an opening large enough to facilitate the observation of patient's nose and mouth and the procedures such as daily oral care. Furthermore, the outer rim of the mask is designed to effectively retain oxygen flow without causing rebreathing.
二氧化碳监测仪已被广泛用作呼吸监测设备。对于非插管患者，由于气管梗阻频繁发生，稳定监测二氧化碳（CO₂）尤其成问题，而在给予氧气时难度可能更大。氧气通常通过氧气面罩或氧气管插管给予；然而，这些方法存在一些问题。对于氧气面罩，必须提供高流量氧气以防止呼出的CO₂再吸入，至于氧气管插管，它无法提高氧气浓度，而且在输氧过程中患者可能会感到不适，因为它会使鼻黏膜干燥。为了解决这些问题，我们开发了一种新型的主流二氧化碳监测仪系统，该系统在输氧时能稳定监测呼出的CO₂。这种二氧化碳监测仪系统有一个面罩，其开口足够大，便于观察患者的口鼻以及进行日常口腔护理等操作。此外，面罩的外缘设计能有效留住氧气流而不会导致再吸入。
