Vera Bowker couldn't walk a month ago because of a clot in her leg caused by an ulcer. Her husband Morris was worried that the clot could have long-term effects on her health.

But her veins were so fragile that doctors could not risk intervening with traditional techniques.

Professor Michael Rees, a consultant in clinical radiology at the University of Bristol, decided to use a device he had developed to treat heart blockages.

The operation involved inserting a very fine wire into the affected area and vibrating it with the device.

Hair-thin wire is inserted in affected area

Professor Rees said: "When carrying out angioplasty, you try to make fine movements with your hands and I wanted to find a way to substitute these movements more efficiently using a mechanical helper."