Sue Hardie says her daughter has made good progress

It is thought that two-and-a-half-year-old Alice Hardie is the first youngster in the world to undergo keyhole surgery to have the implant fitted.

Before the operation, Alice was profoundly deaf.

But Alice's mother Sue said she has since made tremendous progress.

"She can hear the phone ringing, and recognises it for what it is.

"The keyhole technique is fantastic. My daughter went down for surgery and she came back five hours later looking very much the same as she had done went she went down.

"In fact, we were only in hospital overnight. It was unbelievable.

"We now have every hope that Alice will be able to live a completely normal life, like her hearing brother, and go to mainstream school."

Acoustic signals

The cochlear implant is made of flexible silicone and titanium

The cochlea is the part of the ear which transforms acoustic signals into electric signals which can be understood by the brain.

The implant uses a microphone to pick up sounds, which are then passed to a speech processor, which is worn on the body like a Walkman.

This converts the speech into electronic signals which are then transmitted to a receiver implant implanted behind the ear.

A wire from this passes the signal into the inner ear and the cochlear nerve which carries it to the brain.

It restores limited but useful hearing to a meaningful level of 30 to 40 decibels.

The keyhole surgery technique has been developed by Professor Gerry O'Donoghue.

He said: "Cochlear implants give deaf children the gift of hearing but the more conventional incision was somewhat excessive.

"Technology now allows us to operate on younger and younger children, but at the same time we needed to develop a technique which reduced the psychological effects as well as the physical scarring, because this could often deter children or prospective parents from considering implantation as an option."

The new technique is known as the Nucleus 24. It lasts for about 60 years.

There are approximately 23,000 deaf children in the UK. Over 40,000 children and adults have cochlear implants world-wide.