Basic digital hearing aids generally require the wearer to make some manual adjustments in certain listening environments, such as turning a volume control up or down, or pushing a button to change listening programs. In contrast, a premium or more advanced hearing aid responds automatically to changes in the listener's environment, making changes based on the signals being detected by the hearing aid. The hearing aid wearer is not required to make any manual changes. As the level of the technology increases in hearing aids, so does the availability of advanced features. Examples of some of the advanced features found in today's digital hearing aids are shown below.
When selecting a style the following is considered:
● The degree of the hearing loss (power requirements)● Manual dexterity and visual abilities● Patient budget● Cosmetics● Skin sensitivities● Anatomical/medical considerations● Lifestyle and listening needs
Styles of hearing aids
Hearing aids are available in many different sizes and styles thanks to advancements in digital technology and miniaturization of the internal components. Many of today's hearing aids are considered sleek, compact and innovative – offering solutions to a wide range of hearing aid wearers.
In the ear (ITE)
Hearing aids worn in the ear are usually custom-fit, based on a cast or impression of the ear. They're available in different skin tones to camouflage with the outer ear. There are several styles – each is listed below, ranging from smallest to largest.
Invisible in canal (IIC)
The smallest custom style, IIC instruments, sit invisibly in or past the second bend of the ear canal. IIC devices are specifically designed for mild-to-moderate hearing loss.
Completely in canal (CIC)
One of the smallest custom styles, CIC instruments, fit deeply and entirely within the ear canal. They fit mild-to-moderate hearing losses and offer high cosmetic appeal, as they're nearly invisible when worn.
In the canal (ITC)
ITC instruments sit in the lower portion of the outer ear bowl, making them comfortable and easy to use. Because they're slightly larger than CIC models, they have a longer battery life, and can host additional features such as directional microphones for better understanding in noisy environments, and controls such as volume controls. They fit mild and moderate hearing losses.
Full shell in the ear (ITE)
Full shell models sit flush within the entire ear bowl. Their size allows the maximum number of additional controls and features such as directional microphones, which require space on the outer portion of the instrument. They use a larger battery size than the smaller styles and can fit a larger receiver with enough power for even some severe hearing losses. Because of their flexibility, they're widely recommended for mild-to-severe hearing loss.
Behind the ear
Behind-the-Ear (BTE) models sit behind or on top of the outer ear, with tubing/wiring that routes sounds down into the ear that connects to an ear tip or earmold to secure them in the ear canal. BTEs come in a variety colors to blend with hair or skin tones, and even chrome colors, leopard print and other funky designs to suit personal styles. Different BTE sizes accommodate different features, controls, battery types and degrees of power (larger instruments generally have more power than smaller ones). While many people choose discreet BTEs that are unnoticeable when worn, others are tempted to show off the cool designs. There are several styles – each is listed below.
Mini BTE with slim tube and tip
Mini BTEs are designed to hide behind the outer ear and have ultra-thin tubing/wiring to discreetly route sound into the ear. The tubing/wiring connects to a soft tip that sits in the ear canal but doesn't occlude it. The result is a natural, open feeling as airflow and sound enter the ear naturally around the tip, while amplified sound enters through the tip. This is known as “open fitting” and is recommended for mild-to-moderate high frequency losses.
Receiver in ear (RIC)
RIC models are mini BTEs that have the speaker of the instrument incorporated in the ear tip, instead of in the main body of the instrument. RIC instruments fit mild-to-severe hearing losses. This hearing aid style looks similar to the Mini BTE when worn on the ear.
BTE with Earmold
BTEs with earmolds fit mild through severe hearing losses. Their longer shape follows the contour behind the outer ear and can house many features, including a program button and volume control. The earmold color and style, as well as the wearer's hairstyle, determine exactly how they'll look on each person.
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