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Ear could power efficient radios

Andrew KaysbyAndrew Kays
November 10, 2012
in Anatomy News, Biology, Chemistry, Health, Inventions, Research
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Take a moment to think about what your ears do. The human ear has a complex system for turning mere sound waves into electric messages for your brain, and it serves to keep you balanced. In order to turn sound waves (which are mechanical energy) into the electrochemical energy that sends messages to the brain, the waves have to go through the three parts of the ear.

The outer ear is what you generally think of, the fleshy outside and ear canal, and it funnels sounds into your ear and helps with identifying where the sound came from. The middle ear uses the eardrum and some very small bones to make the sound louder. The inner ear uses the vibrations from the middle ear to move liquid in the cochlea, which moves small, sensitive hairs that help turn the sound into the signals the brain can read. It’s a pretty cool process.

Researchers from MIT, the Massachusetts Eye and Ear Infirmary (MEEI) and the Harvard-MIT Division of Health Sciences and Technology have found that not only can they place a small chip capable of measuring the health of the ear within the middle ear cavity, but they can steal some electricity to power it from the inner ear. Although we have known about the electricity-producing capabilities of the inner ear for about 60 years, this is the first time that it has been harnessed without hurting hearing ability.

The battery is the result of a membrane in the cochlea which has unequal amounts of potassium and sodium molecules on either side. When the membrane lets them pass through it, electricity is created. Most of it goes toward making the ear work, but the researchers were able to redirect a little to a small radio transmitter. The transmitter is specially designed to be extremely energy efficient and able to store energy when not in use. It does need to be jump-started when first implanted though, which is done with sending radio waves to it.

The size of the device compared to a penny.

So far the device has only been put in guinea pigs, but in the future could expand from simple medical measurements to providing therapy to people who have hearing disabilities.

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Andrew Kays

Andrew Kays

I find that many people, both peers and American society in general, think science is some combination of boring, wrong and useless. On the contrary, I find it to be a resplendent mosaic of perspectives, environments and people producing amazing things. Many of those people are producing the future at an accelerating rate, and every day our society’s dependence on science increases. My goal is to emphasize the beauty of science, expose it to and attract future scientists and clear up common misconceptions in the public forum. In the meantime, I want to make you a more scientifically-informed citizen and show you how incredible our world is with a little knowledge about science. I'm studying journalism and anthropology and am an avid runner and outdoorsman. History, genetics and scientific art are a few of my ever-expanding favorite subjects. Contact me with any questions or general musings!

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