Klausen N O, Lomholt N, Qvist J
Crit Care Med. 1982 Jan;10(1):52-4. doi: 10.1097/00003246-198201000-00015.
The NL-tracheostomy tube has a large diameter, large residual volume cuff with automatic and instant cuff pressure regulation. It has been shown in clinical studies to prevent mucosal damage; and depending on airway pressure, it should in theory prevent or delay the onset of trachea dilatation. The authors report 2 patients who developed severe tracheal dilatation with use of standard low volume cuffs during prolonged mechanical ventilation. Placement of the NL-tracheostomy tube with a special long intratracheal leg and cuff positioned below the dilatation abolished the acute problems of air leakage. Tracheal dilatation at the new cuff site did not develop in 1 patient and was slowed in onset in the 2nd patient, who needed high inflation pressures.
NL气管造口管直径大，具有大容量残余体积袖带，可自动即时调节袖带压力。临床研究表明，它可防止黏膜损伤；从理论上讲，根据气道压力，它应能预防或延缓气管扩张的发生。作者报告了2例患者，他们在长时间机械通气期间使用标准小容量袖带时出现了严重的气管扩张。放置带有特殊长气管内段且袖带位于扩张部位下方的NL气管造口管，消除了漏气的急性问题。1例患者在新的袖带部位未出现气管扩张，另1例需要高充气压力的患者气管扩张的发生有所延缓。
