Putting something in the body and getting it back out without tearing, is not invasive. Eating and vomiting would be categorized as invasive, in context.
A colonoscopy/endoscopy is internal and dangerous, which is not the same thing as being invasive, so the term "minimally invasive" is sometimes used as a happy middleground, which has then been sensationalized.
"(of medical procedures) involving the introduction of instruments or other objects into the body or body cavities."
YMMV
I dunno. Ears (eardrums), colons, etc are tricky to cover all at once. I don't envy the authors of medical literature.
> Putting something in the body and getting it back out without tearing, is not invasive.
Just for clarity colonoscopy is an invasive procedure.
> Just for clarity colonoscopy is an invasive procedure.
The definition is the point at hand. Stating that it is intrinsically a truism, is not compelling.