Nice work and a good education interviewing medical personnel.
(PTFE) Polytetrafluoroethylene is misspelled
airborne rather than "air born"
pacemaker is one word
The first answer 5 needs to be numbered "5"
I think the wording between the two questions involving "heart stent" might be contradictory and confusing to some. The person who invented the heart stent and the person who invented the 1st heart stent not being the same.
Just a little rewording, for instance, Kamen invented a better heart stent.
They don't remove the balloon catheter after it expands the artery/stent, leaving the stent behind?
There's an arterial clog for you
The question coming immediately after the balloon question seems to imply the balloon stays behind as well as the stent.
P.S.
I believe PTFE is used as a coating on the stent itself, rather than the balloon that gets withdrawn afterwards.
Both Kamen and Palmaz happen to be inductees of the National Inventors Hall of Fame.