Tracheostomy tube inner and outer diameter dimensions

Differences between tracheostomy include inner and outer diameters and shape of cuffs. Both tracheostomies have the same internal diameter but differ in outer dimensions. On the right side of the image, note the tapered cuff that facilitates insertion, promotes more airflow around tube, and decreased pressure points on lateral tracheal walls.

1. Inner diameter – 8.0 mm
2. Outer diameter – 13.3 mm

(B) Shiley flexible cuffed 7CN80H

1. Inner diameter – 8.0 mm
2. Outer diameter – 11.4 mm