CLEVELAND, Ohio – Amanda Kitts loves traveling the world with her husband. But a car accident in 2006 changed her life forever.
She was driving home from work one day and a pickup truck collided into her car.
"His tire flew off and his axle came in through my window and ripped my arm off."
The accident didn't only take her arm but also her ability to do simple everyday activities.
"Silly little things like putting toothpaste on a toothbrush or even trying to put on a bra."
About 1.8 million Americans are living with amputations.
Paul Marasco is an Associate Staff Scientist in Biomedical Engineering in the Lerner Research Institute of Cleveland Clinic, and Principle Investigator in the Advanced Platform Technology Center of the Louis Stokes Cleveland VA Medical Center.
He thought Amanda would be a perfect candidate to try a new type of bionic prosthesis that restores the sense of touch and movement sensation for upper limb amputees. All candidates must have already undergone a targeted nerve re-innervation, which is a procedure to redirect amputated nerves to new muscle in the arm or chest.
"When we vibrate those muscles, it provides an illusion of movement," said Marasco.
He says it allows patients to sense that their hand is moving in very complex and naturalistic ways.
"They've taken out their nerves after the amputation and then redirected them to new muscle and skin sites," said Paul Marasco.
"When the amputee thinks 'I want to move my hand', little parts of their reinnervated muscles twitch and we can read that with a computer. It pushes on the reinnervated skin and then they feel the sensation in their brain as though it's their fingertip and then they map that out to the prosthesis. They see their finger being touched and they feel like that's their finger."
Patients feel when their hand opens and closes, and how hard they squeeze something when they have the prosthesis on.
Marasco also says this technology allows amputees to see this prosthesis as part of their body.
"You know when you get a new sense that you haven't had for so many years, it's been 12 years since I lost my arm. It's another movement towards having a real hand, having a real arm. It's amazing actually."
IMPACT: During the amputation procedure, doctors will remove any diseased tissue or crushed bone and seal off blood vessels and nerves. Adapting to amputation is a challenge, not only physically, but mentally as well. After an amputation, people can be prone to suffering from body image issues. Also, an amputation can affect a person's ability to take part in the same social activities, leisure pursuits or hobbies that they would have otherwise enjoyed. Social withdrawal can often result, leaving the injured person feeling isolated. Their personal relationships can be heavily affected, as some amputees completely avoid contact with their friends and peers, or even exhibit outbursts of anger at those loved ones they are still in contact with; most likely those who are helping them and providing care. (Source: http://www.seriousinjurylaw.co.uk/other-serious-claims/amputation/effects-of-amputation/)
The patients in this trial have a prototype of the prosthesis, but it isn't on the market yet.
Marasco is also exploring ways to expand this technology to patients who have lost a leg.
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