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14 Cards in this Set

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  • Back
* What is a form factor as it relates to hearing aids?

Form factor or style is chosen to match the hearing loss and communication needs of the individual. Choice of style is based on several factors, including dexterity, degree of hearing loss, cosmetic needs, ease of use, need for special features etc.

* What are the form factors for air-conduction hearing aids? Could you name an advantage and a disadvantage of each form factor?

- BTE: more power, more features, more flexibility, If a patient wears glasses or oxygen (or both) this may be inconvenient because they sit behind the ear.

- ITE: nothing behind the ear for glasses wearers. Occlusion effect

- ITC: you can capitalize on a little bit of the gain from the pinna. Still have the occlusion effect.

- CIC: invisible. You can use the gain from the pinna and a portion of the canal to decrease the amount of gain coming from the hearing aid. Small, deep impression, battery life is short

* What is a “coupling system”? How does it relate to hearing aids?

- A technological device (receiving system) that connects to the hearing aids ex: microphone, FM device, alerting device etc

* What is the difference between an earmold and an earshell?

- earmold is an independent coupling system attached to the aid, earshell is a dependent coupling system which the aid is integrated with the shell.

* Could you identify the parts (anatomy) of an earmold?

* Could you identify the 5 most common earmold styles?

- full shell, half shell, skeleton, canal and free field/CROS

* Could you discuss the advantages and disadvantages of two types (soft and hard) earmold materials?

- Soft material can fall out and tear/break, hard material can cause ear pain and don't seal as well, soft material can mold to canals that change shape, more comfortable (ex: someone with TMJ), hard material can last a long time

* What were the three ways in which we modify the acoustic path?

- damping, venting, filtering

* What effect does sending the sound through a longer sound path vs a shorter sound path have on the frequency response?

- change of the tube length results in slightly more complicated results, frequency response shifts as length changes

- Longer tubes have more acoustic mass internally (essentially volume of air)

- As acoustic mass increases, high-frequency components of the signal are reduced

* Wider vs narrower sound path?

- with a large sound bore create a horn effect, which slightly increases high-frequency gain.

- when the internal diameter of the tubing becomes smaller, there is a gradual reduction in the hearing aid’s gain in the frequencies above 2000 Hz.

* What is a damper?

- Damping is a method for altering the frequency response of a hearing aid. It is most common to place a damper in the tone hook of the BTE instrument. Dampers deal with the mid frequencies.

* What is a filter?

- A filter usually refers to material that is places near the end of the sound deliver system. It has the greatest impact on high frequencies. Composed usually of lambs wool, foam, cotton, commercial.

* What is a Vent?

- A vent is a hole or trench in the earmold or custom hearing aid that allows communication (air and sound) from the residual ear canal space to the outside world. Direct and indirect source of venting.Total venting is the intended + unintended. There are three types: parallel, side branch, and trench.

* What are the sources of venting?

- amplified sound, direct sound, bone conducted sound