XP Peritympanic hearing aid
Henri Garcia, PhiIips Hearing Instruments
About 28 million Americans--roughly one in every nine--have a hearing impairment that could be eased by the use of a hearing aid. However, fewer than one in four of those afflicted avail themselves of the device. People still think that someone wearing a hearing aid doesn’t understand things or is even somehow mentally confused, says Wayne Staab, a Phoenix-based audiologist. But now the Philips XP Peritympanic device allows people with hearing loss to get around that stigma. Priced from $1,500 to $2,000, the XP costs 20 percent more than conventional hearing aids.
The XP, developed over five years by a Netherlands-based Philips Hearing Instruments technical team led by electrical engineer Henri Garcia, is the first invisible hearing aid. The tiny cylinder--about a quarter- inch wide and a half-inch long--fits deep inside the auditory canal, almost touching the eardrum, where no one can see it. But it’s there for reasons beyond cosmetics. We’ve known for years that putting an instrument that deeply into the ear canal would provide tremendous auditory advantages, adds Staab, who helped Philips engineer improvements to the device. But until now we haven’t been able to make an instrument fit down there comfortably and still meet wearers’ auditory requirements. The XP finally gets down into the ear canal, where we know hearing aids really belong.
Conventional hearing aids typically create new problems for wearers while solving others. Devices that rest in the cup of the outer ear turn breezes into noise. They often have to be removed when the wearer uses the telephone. By plugging the ear, they also transform the auditory canal into a resonating chamber where low-frequency sounds, like those made by the user’s own voice or chewing, are grossly amplified. The larger the space between a hearing aid and the eardrum, the more resonance in the lower frequencies, Staab explains. The problem: while about 60 percent of the sound energy in ordinary conversation is contained in low-frequency vowel sounds, those sounds convey only about 5 percent of speech’s actual information. Higher-frequency consonant sounds contain roughly 5 percent of speech’s power but convey 60 percent of its intelligibility--the sounds most hearing aids mask. When the hearing aid is placed deep in the ear, the length of the resonating chamber is shortened; the XP assures that higher- frequency sounds are made clear.
Although its electronics are among the smallest made, the XP is unique in its ability to hold the components so deep in the ear. To fit comfortably in the deep inner ear’s bony cavity, the XP had to be crafted from a spongy and flexible material; but to fit securely and anchor delicate electronic components, the material also had to be firm. To meet both demands, Philips compounded a new proprietary, full-comfort material. As it warms in the ear, the material becomes flexible enough to conform to the shape of the bony part of the canal, but it remains firm enough to stay in place and protect onboard electronics. The material also smothers sound waves, preventing them from leaking back from speaker to microphone and sparking the annoying whistle of feedback.
To ensure each XP’s snug fit, Philips also perfected a new, liquefied silicone putty to make a cast of each wearer’s inner ear. The putty fills the auditory channel near the eardrum, where it sets and yields a mold of the wearer’s ear canal. Using the mold as a model, technicians can then tailor the aid to its wearer’s contours. A thin, transparent cord ending in a small knot extends from the hearing aid to the wearer’s outer ear; to remove the XP, the wearer simply hooks the knot with a fingernail and pulls.
Unfortunately, approximately 30 percent of the hearing-impaired population have ear canals that are too small, are too sharply bent, or have preexisting medical conditions that prevent safe fitting of the XP. No hearing aid will ever be perfect, Garcia says. But the XP gets us a lot closer to meeting the real needs that people with hearing loss have.
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