A new hearing aid lets you avoid frequently changing batteries. The Lyric from InSound Medical (based in Newark, California) can be wore continuously for as long as 4 months. Doctors put the cylindrical device deep inside a patient’s ear where it can’t be seen – provided they have large enough and straight enough ear canal. The Lyric can be wore during most activities but not swimming. A new model mau take care of that issue later this year.
Other limitations: The Lyric is only for those with mild-to-moderate hearing loss and can cost as much as $4000 a year. When it dies, you have to see a doctor to get the batteries replaced. Or if ear wax clogs it, you'll have to go to a doctor. Some clinicians wonder about safety because there is no research on the long-term effects.