An estimated 2 million stents are implanted into people’s hearts around the world each year – making it one of the key treatments for heart disease.

The treatment was invented by Argentinian doctor Julio Palmaz, who credits a piece of metal being left by a construction worker in his home as inspiration for the structure of the stent.

Collaborating with a US Army cardiologist and getting funding from the owner of a fast-food chain and a pharmaceutical giant; the coronary stent was approved for use in human beings in the 1990s.

Julio Palmaz speaks to Tim O’Callaghan about his invention.

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(Photo: Julio holding a stent. Credit: Julio Palmaz)