Clinical nurse specialist Daren Edwards helped save the leg of a lorry driver earlier this year with the aid of 30 leeches.
David Isitt was injured in March when he slipped off the side of his truck and shattered several major bones in his right leg.
Mr Edwards, who is responsible for plastic surgery patients at the Royal London Hospital, Whitechapel, decided to use the leeches to help maintain circulation in a large skin flap on the leg. In total the leeches were needed for more than a week.
Mr Edwards said: 'I've used them before but not over such a long period and that is a reflection of the seriousness of Mr Isitt's injuries.