Parkinson's patients have tubes placed in brain in protein study

New drug-delivery system could also be used to treat brain tumours and strokes

People with Parkinson's disease have been fitted with an implant that can deliver drugs directly to the brain through a port in the side of their head, in a pioneering study.

The device was used to send a naturally occurring protein, which it is hoped may help restore cells damaged by the disease, to an affected part of the brain.