From GanfydIn principle, putting one tube in another anywhere in the body, such as in endoscopies of the gut, can be so described. However, on its own, intubation or intubate generally refers to tracheal intubation.
The NEJM published a video 
Google (!) has a 1 minute demonstration (by an anaesthetist) 
And a longer one , more of a tutorial. This can be downloaded for later showing.
And (of course) there are several on YouTube .
Training mannequins are available .
- ↑ http://content.nejm.org/cgi/content/video_preview/356/17/e15 http://content.nejm.org/cgi/video/356/17/e15/ (subscription required)
- ↑ http://www.youtube.com/watch?v=5ueZ9YO2sRM
- ↑ http://video.google.com/videoplay?docid=-1375225034221745864
- ↑ http://www.youtube.com/results?search_type=&search_query=tracheal+intubation&aq=f
- ↑ http://www.trucorp.co.uk/site/default.asp?secid=home
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