Meriläinen P, Hänninen H, Tuomaala L
Datex Division, Instrumentarium Corporation, Helsinki, Finland.
J Clin Monit. 1993 Nov;9(5):374-80. doi: 10.1007/BF01618680.
Measurement of gas flow and airway pressure at the Y-piece of an endotracheal tube provides valuable information about airway integrity and basic pulmonary function. We describe the working principle and design of the D-lite sensor (Datex Division, Instrumentarium Corporation, Helsinki, Finland), which, in a single, lightweight adapter piece, encloses flow, airway pressure, and sidestream gas measurement. The main emphasis in the design of this instrument was on reliable and accurate operation during continuous monitoring with exposure to humidity and mucus. Therefore, a robust flow-restrictor element with a pick-off arrangement resembling a Pitot tube was employed. This arrangement has nonlinear characteristics with potential difficulties in the measurement of small flows. However, these inherent drawbacks, together with compensations required because of varying gas fractions and pressure, can be handled by sophisticated computer algorithms at the host-monitor end (Capnomac Ultima [Datex Division, Instrumentarium Corporation, Helsinki, Finland]). Validation methods with main results and a brief review of applications are given.
在气管内导管的Y形接头处测量气流和气道压力，可提供有关气道完整性和基本肺功能的有价值信息。我们描述了D-lite传感器（芬兰赫尔辛基Instrumentarium公司Datex分部）的工作原理和设计，该传感器在一个轻便的转接件中集成了流量、气道压力和旁流气体测量功能。该仪器设计的主要重点是在暴露于湿度和黏液的连续监测过程中实现可靠且准确的运行。因此，采用了一种带有类似于皮托管的传感装置的坚固限流元件。这种装置具有非线性特性，在测量小流量时可能存在困难。然而，这些固有缺点以及因气体成分和压力变化而需要进行的补偿，可以通过主机监测端（Capnomac Ultima [芬兰赫尔辛基Instrumentarium公司Datex分部]）的复杂计算机算法来处理。文中给出了主要结果的验证方法以及应用的简要综述。
