Post Market Surveillance is obvious in instances of failure, as many have stated, FDA has guidelines on how to go about it. But I think even participation factor from marketing end, where one would monitor just feedback on lets say amazon, or online forums such as reddits. End users can give feedback on improvements for the next iteration of the product, for it would be suggestions that are better suited from real world applications, something the design team could’ve have never conceived of. One such product that comes to mind, is the toothpaste flip top end cap, a modification made by a teenager, his suggestion was welcomed by colgate-palmolive, and was implemented very quickly. Now I don’t see why even modifications/suggestions for medical devices cannot be made from such feedback, maybe small visual markers on buttons, such as colored led lights for night usage.