Which scientific principle was uniquely applied to create the first commercially successful dissolving stents for coronary artery disease?

The pharmaceutical and medical device industries constantly push boundaries with innovative products. Some breakthroughs revolutionize treatment approaches and patient outcomes through novel scientific applications. This poll tests your knowledge about a significant product innovation that transformed a critical area of healthcare by applying an unexpected scientific principle.

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Biodegradable polymers derived from lactic acid, similar to those used in dissolvable sutures
Nanotechnology using gold particles that gradually disperse into the bloodstream
Enzyme-activated metal alloys that break down when exposed to specific blood proteins
Photodegradable composites that dissolve gradually when exposed to natural body heat