Mahmud Nawaz, director at Sheffield Teaching Hospitals NHS Trust and ambassador for the British Transplant Games, said the cards would encourage people to sign the register and have a conversation with loved ones about organ donation.
His wife died of a sudden severe brain haemorrhage aged just 32.
Nawaz said: “I lost my wife in 2004 and she went on to become an organ donor and saved four lives, including a little boy who wouldn’t have made it to two without the smaller part of her liver.
“That all came about because we’d had the conversation about organ donation in advance, so I knew she wanted to be a donor.
“And that came about because she carried a donor card in her purse. So we had that conversation as a result of the card.”
Nawaz said he was “prepared” to face the question from medics when she died because he knew in advance that his wife wanted to donate her organs.
“That prepared me at the worst possible time when you lose someone in quite a sudden and traumatic way, to be able to say yes, because that’s what she wanted,” he said.
“As a result of that, those four people got that gift of life as well.”