CochlearImplants
Latest
Amped-up ear implant helps to re-grow auditory nerves
Cochlear implants already help those with auditory damage to hear better, but what if they could also grow new nerves while they're there? Scientists at the UNSW have discovered a way to do just that, at least in hamsters. After they introduced a gene therapy solution, a modified cochlear implant used electrical pulses to deliver the treatment directly to auditory nerve cells. That successfully re-generated so-called neurotrophins in the animals, which in turn aided nerve development and significantly improved the implant's effect. Such therapy could one day help the hearing-impaired to pick up sounds better, especially the subtle tones in music. There's a long ways to go prior to human trials, however, since it was only effective in the hamsters for a short time. But it could one day be included as part of cochlear implant therapy and even help other nerve-related conditions, like Parkinson's disease or depression. [Image credit: UNSW Translational Neuroscience Facility]
MIT ear-powered wireless sensor sustains its charge through sound
You wouldn't immediately think of the ear's cochlea as an energy source, but MIT knows that every mammal effectively has a pair of very small power plants because of the ionized environment. School researchers are trying to harness that energy through a new sensor that exploits the whole ear canal system. As eardrum vibrations naturally create a usable voltage from brain signals, the prototype can build enough charge in a capacitor to drive a very low-power wireless transmitter that relays the electrochemical properties of the ear and potentially diagnoses balance or hearing problems. The beauty of the system is its true self-sustainability: once the transmitter has been been jumpstarted with radio waves, it powers itself through the resulting transmissions. Energy use is also sufficiently miserly that the sensor doesn't interrupt hearing. Work is still early enough that there's a long way to go before such implants are part of any treatments, but there's hope that future chip iterations could help fix inner ear maladies, not just report on them. Something tells us, however, that the doctor won't ask us to take two dubstep tracks and call back in the morning.
Accelerometer mic could change the way we look at cochlear implants
Hearing aids aren't the most discreet cybernetic creations, because the need for a clog-free microphone means that they generally need an external component. Engineers at the University of Utah and Case Western Reserve University in Cleveland aim to change everything with a much smaller mic that uses an accelerometer to detect sound vibrations -- so it requires no opening and can be inserted right into the ear. The only exterior hardware is the charger -- worn exclusively at night. Clinical trials in living humans begin approximately three years from now, and if you're looking forward to using this new device, removal of the incus (or anvil bone) in the middle-ear must first take place to optimize effectiveness of the new implant. We never said it'd be pretty.
