Hi twovillages and thanks for your post. You may be aware we cannot provide medical advice or diagnostics over the internet (for your own safety), but your concern warrants a reply for certain.
First, you may want to look over this comment from one of our members related to pulmonary valves: https://copd.net/stories/valves/.
Second, if you would like to know more about pulmonary stents, I would suggest you do a GOOGLE search using the words 'pulmonary stent'. You will find a good number of links to information all concerning airway stenting.
And finally, I would suggest you contact your physician to discuss if your are a candidate for this type of intervention - your health care professional will be able to discuss this with you on a personal level. I do hope this brief reply provides you with some guidance for your concerns. Wishing you the best, Leon (site moderator)