Improvement of the Airway Scope® orotracheal intubation blade to nasotracheal intubation blade and its usefulness

Hiroshi Kawahara, Eiji Sakamoto, Kazumi Hidaka, Kouji Yamaguchi, Takaki Nakashima, Aya Kai, Nozomu Harano, Mitsuhiro Yoshida, Shunji Shiiba, Osamu Nakanishi

Research output: Contribution to journalArticlepeer-review


The Airway Scope® (PENTAX : AWS-S 100, AWS) is a novel intubation device which made possible to perform endotracheal intubation easily. The AWS is paired with an Intlock® blade (ITL-S) for orotracheal intubation. We improved the ITL-S to nasotracheal intubation blade (ITL-N), and evaluated its usefulness by a manikin study. There are two main parts in the ITL-S. One is the laryngoscopy part, and the other is the endotracheal tube guide part. We removed the endotracheal tube guide part in the ITL-S (Fig. 1), and used the laryngoscopy part as the nasotracheal intubation blade (ITL-N) (Fig. 2). We compared the ITL-N with the ITL-S in simulated right and left nasotracheal intubations. Twenty-four dental anesthetists and oral surgeons who have anesthesia training consented to participate in this study. The design of the study was randomized. Twelve participants used the ITL-N, and other twelve used the ITL-S. At first, each participant exercised to use AWS on the Laerdal Airway Management Trainer®. All nasotracheal intubation were performed with a 7.5 mm internal diameter endotracheal tube (Kendall, Curity®) using Magill forceps. Each participant first performed a right nasotracheal intubation, and then performed a left nasotracheal intubation. The right nasotracheal intubation time was 20.0±7.0 sec (mean±SD) by ITL-N, and 20.6±7.9 sec by ITL-S. There was no significant difference between ITL-N and ITL-S. The left nasotracheal intubation time was 19.1± 5.0 sec by ITL-N, and 29.2±14.9 sec by ITL-S. There was significant difference (p = 0.037) between ITL-N and ITL-S. These results indicated that ITL-N was useful for a left nasotracheal intubation on a manikin study. The AWS with ITL-S is possible to use for the orotracheal intubation in trismus patients. However, we experienced that ITL-S was not proper for the nasotracheal intubation in trismus patients. We also experienced that ITL-N was beneficial for nasotracheal intubations in such a kind of patients. The results of this study and our clinical experience indicated that ITL-N may be beneficial for nasotracheal intubation.

Original languageEnglish
Pages (from-to)389-391
Number of pages3
JournalJournal of Japanese Dental Society of Anesthesiology
Issue number3
Publication statusPublished - 2007
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Dentistry
  • Anesthesiology and Pain Medicine


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