comment on this article

Researchers use inner ear 'battery' to power medical implants

Ear powered medical devices on the way?

Researchers in the US have, for the first time, powered an implantable electronic device using an electrical potential - a natural battery - deep in the inner ear.

The team from MIT believes this new type of biological battery could one day power implantable electronics devices without impairing hearing, and even be used to deliver medicines and therapies.

In experiments, the researchers implanted electrodes in the biological batteries in guinea pigs' ears. After the implantation, the guinea pigs were said to respond normally to hearing tests, and the devices were able to wirelessly transmit data about the chemical conditions of the ear to an external receiver.

The chip was equipped with an ultra low power radio transmitter and power conversion circuitry. To reduce its power consumption, the control circuit had to be drastically simplified. Like the radio, however, it still required a higher voltage than the biological battery could provide. Once the control circuit was up and running, it could drive itself; the problem was getting it up and running.

The researchers solved this problem with a one off burst of radio waves. The team implanted electrodes attached to the chip on both sides of the membrane in the biological battery of each guinea pig's ear. "In the very beginning, we need to kick start it," said Anantha Chandrakasan's, from MIT's Microsystems Technology Laboratories. "Once we do that, we can be self sustaining. The control runs off the output."

The researchers see three possible applications for their work: in cochlear implants, diagnostics and implantable hearing aids.

"The fact that you can generate the power for a low voltage from the cochlea itself raises the possibility of using that as a power source to drive a cochlear implant," said Chandrakasan. "Imagine if we were able to measure that voltage in various disease states. There would potentially be a diagnostic algorithm for aberrations in that electrical output."

Chandrakasan concluded: "I'm not ready to say that the present iteration of this technology is ready. But if we could tap into the natural power source of the cochlea, it could potentially be a driver behind the amplification technology of the future."

The work was carried out in collaboration with the Massachusetts Eye and Ear Infirmary and the Harvard-MIT division of Health Sciences and Technology.

Laura Hopperton

Comment on this article

This material is protected by MA Business copyright See Terms and Conditions. One-off usage is permitted but bulk copying is not. For multiple copies contact the sales team.

Enjoy this story? People who read this article also read...

What you think about this article:

Add your comments


Your comments/feedback may be edited prior to publishing. Not all entries will be published.
Please view our Terms and Conditions before leaving a comment.

Related Articles

Moment of truth?

When it is reported that Apple has set about assembling a large team of ...

Thanks for the memory

Flash memory has become ubiquitous. It’s the technology that features in all ...

Rugged HMI panel

Arbor has released the IOT-500, an HMI panel engineered to provide the highest ...

Custom MMIC design

Plextek RFI CEO Liam Devlin discusses the technical and commercial ...

Between the layers

ZofzPCB is a free 3D Gerber viewer that allows designers to see inside the ...

Fit for service

There are some truly exciting opportunities on the horizon. Over recent years, ...

Intel looks to IoT

Intel has built its business on domination of the PC market. Over the years, ...

Continuing to evolve

The Raspberry Pi has passed a significant milestone. Launched four years ago, ...

Keeping standards high

Engineers – at least those who are worth their salt – ask questions. And those ...

Interesting times

It has certainly been an interesting year for chip giant Qualcomm. Revenues are ...