Rao A J, Aiyer C R, Komatsu T, Shimada Y, Yanagita N, Hattori S
Department of Otorhinolaryngology, Nagoya University, Japan.
Ann Otol Rhinol Laryngol. 1989 Feb;98(2):157-9. doi: 10.1177/000348948909800214.
The feasibility of monitoring cannula obstruction was studied by conversion of the electrical resistance of substances that are capable of causing obstruction into audible auditory signals. Copper-nickel-gold electrodes were thermal pressed onto polyimide-based flexible films placed as 1-mm wide strips along the inner surface of tracheostomy and endotracheal tubes. The responses were fed into a resistance-to-frequency converter (IC 555 timer), and the output was frequency selected to generate auditory responses through a piezoelectric beeper. Quantitative estimates of responses from the IC output were computer averaged. Instantaneous obstruction detection was made possible by the immediate responsiveness of the device in the presence of obstruction.
通过将能够导致阻塞的物质的电阻转换为可听的听觉信号，研究了监测套管阻塞的可行性。将铜镍金电极热压到聚酰亚胺基柔性薄膜上，这些薄膜沿着气管造口管和气管内导管的内表面以1毫米宽的条带放置。响应信号被输入到一个电阻 - 频率转换器（IC 555定时器）中，输出经过频率选择，通过压电蜂鸣器产生听觉响应。对IC输出的响应进行定量估计并由计算机进行平均处理。该设备在出现阻塞时的即时响应能力使得能够进行即时阻塞检测。
