[Problems with the Structure of a New Pentax-Airwayscope S200].

Background: Pentax-Airwayscope (AWS-S100) is useful for tracheal intubation, and a new version S200 has recently been introduced to clinical practice. We felt that S200 was more difficult than the S100 in attaching and detaching a single-use Introck blade.

Methods: In a randomized cross-over design, we compared S100 and S200, for the ease of attaching to and detaching from the Introck, fixation of the Introck using the fixation ring of the main body, and insertion time.

Results: Compared with S100, it was easier for S200 to fix the Introck using the fixation ring (78% vs 72%) (P < 0.05), but it was more difficult for S200 to attach (the incidence 43% vs 2%) and detach (53% vs 11%) the Introck (both P < 0.001). Insertion time was also significantly longer for S200 than S100 (median 9 [IQR : 6-19] s vs 4 [IQR : 3-6] s) (P < 0.001). The flexible scope of one of two S200s kinked and was broken during attachment.

Conclusions: It is necessary to apply lubricant to the distal part of the scope to prevent damage to the scope.