Bionic hand which see and reaches for objects automatically to be trialled by British amputees

Sarah Knapton

A bionic hand which sees an object and reaches for it automatically without thought, is being trialled in British amputees.

The prosthetic is fitted with a camera which takes a picture of the object in front of it, assesses its shape and size then triggers an appropriate grasping movement.

The device is ten times faster than current bionic limbs, and uses artificial intelligence to continually improve its detection and picking-up skills.

Dr Kianoush Nazarpour demonstrates the bionic hand  Credit: Mike Urwin/Newcastle University

A small number of amputees have already trialled the new technology who claim

Dr Kianoush Nazarpour, a Senior Lecturer in Biomedical Engineering at Newcastle University, said: “Using computer vision, we have developed a bionic hand which can respond automatically – in fact, just like a real hand, the user can reach out and pick up a cup or a biscuit with nothing more than a quick glance in the right direction.

“Responsiveness has been one of the main barriers to artificial limbs.

“Now, for the first time in a century, we have developed an ‘intuitive’ hand that can react without thinking.”

The new bionic hand "sees" objects and instantly decides what kind of grip to adopt Credit:  Mike Urwin/Newcastle University

Around 600 people in Britain lose upper limbs each year. Current prosthetic hands work by picking up electrical signals from the stump, but controlling them requires practice and concentration.

But the new device response immediately because it had already been taught to recognise different objects, calculate where they are in space, then select the correct grip.

“We would show the computer a picture of, for example, a stick,” said doctoral student Ghazal Ghazaei, who carried out the work as part of her PhD in the School of Electrical and Electronic Engineering at Newcastle University.  

“But not just one picture, many images of the same stick from different angles and orientations, even in different light and against different backgrounds and eventually the computer learns what grasp it needs to pick that stick up.

“So the computer isn’t just matching an image, it’s learning to recognise objects and group them according to the grasp type the hand has to perform to successfully pick it up.

“It is this which enables it to accurately assess and pick up an object which it has never seen before – a huge step forward in the development of bionic limbs.”

The bionic hand works far faster than traditional prosthetics and does not require training  Credit: Newcastle University 

Doug McIntosh, 56, who lost his right arm in 1997 through cancer, has been trialling the bionic hand.

“This offers for the first time a real alternative for upper limb amputees,” he says.

“For me, one of the ways of dealing with the loss of my hand was to be very open about it and answer people’s questions.  

But not everyone wants that and so to have the option of a hand that not only looks realistic but also works like a real hand would be an amazing breakthrough and transform the recovery time – both physically and mentally – for many amputees.”

The work is part of a larger research project to develop a bionic hand that can sense pressure and temperature and transmit the information back to the brain.

This would mean for the first time the brain could communicate directly with the prosthesis.

Speaking of the new device, Dr Nazarpour said: “It’s a stepping stone towards our ultimate goal.

“But importantly, it’s cheap and it can be implemented soon because it doesn’t require new prosthetics – we can just adapt the ones we have.”

The research was published in the Journal of Neural Engineering. 

 

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