Stents are miniature wire meshes inserted into blood vessels to reduce blockages and allow blood to flow freely to the heart. Because of their biological compatibility and durability, platinum and iridium have proven to be effective metals for making the stents.

And the latest advances in this technology have used the radio-active properties of iridium isotopes to ensure that the stents do not clog and need replacing.
Furthermore, in a similar interventional procedure called coil embolisation, platinum coils are inserted into arteries with aneurysms (potentially fatal bulges), where they prevent blood from flowing into the aneurysm and further