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HIS- Hearing Instrument Specialist > Earmolds > Flashcards

Earmolds Flashcards

1
Q

An earmold that fills the entire concha bowl and canal portion is what type and what type of HL do these suit

A

Shell earmold and suits severe to profound HL as it seals the canal and outer ear

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2
Q

Resemble a shell but only fill the bottom half of the ear. What type of mold?

A

Half Shell

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3
Q

Which type of earmold outlines the rim of the outer ear while effectively sealing the canal.

A

Skeleton EM AKA Phantom or silhouette EM

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4
Q

What type of HL does a Skeleton EM suit

A

Moderate to moderately severe HL

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5
Q

Occurs when air is enclosed in an earmold with rigid walls

A

Acoustic Compliance

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6
Q

Highly compliant Earmolds aid the transmission of which sounds

A

HF sounds

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7
Q

When the volume of air increases by Belling canal or shortening a earmold, compliance increases

A

The Horn Effect

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8
Q

What type of losses require less material in the aperture and intertragal notch area, retaining a natural ear canal resonance

A

More mild HL’s

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9
Q

What kind of vent opens up the canal on a shell, skeleton or canal earmold, creating a non-occluding earmold

A

Parallel Vent

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10
Q

What are some features of a parallel vent

A

More and more canal resonance naturally occurs depending on size of vent
Low Frequencies bleed off through the opening emphasizing higher frequencies and affecting both gain and output by a few dB

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11
Q

Occurs when a volume of air oscillated with compressing to any significant extent, as in tubing or a bore at a vent

A

Acoustic Inertance

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12
Q

Which vents bleed off only extreme lows, and may include more than one vent when necessary

A

Angle or Diagonal Vents

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13
Q

What are some features of an external vent

A

Reduces the fullness or occlusion rather than fulfilling an acoustic modification.
Mostly often used to solve a problem on an unvented ITE or canal instrument.

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14
Q

The gain and output of any HA increase or decreases by changing what

A

Changing tube diameter

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15
Q

What kind of tubing should you use if feedback is a problem or if fitting is tubing only

A

Heavy Wall Tubing

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16
Q

What is the purpose of using dampers, filters or lambs wool in the tubing

A

Restrict the acoustic flow across frequencies. Based on position of filter or damper in the HA earhook or EM determines the frequency response change.

17
Q

What are some deciding factors when choosing Earmold materials?

A

Power level requirements, patient dexterity, ear texture, allergy problems and cosmetic appeal

18
Q

What are some benefits when using Lucite (acrylic) EM

A

Ease of modification, maintenance, durability, and cosmetic appeal

19
Q

Which EM material is best to use when allergy is an issue?

A

Polyethylene, a semi rigid white material resembling paraffin wax

20
Q

Which EM material is best to use when power is a requirement

A

Silicone

21
Q

When performing an impression, why is it important to stay buried in the impression material?

A

To prevent air pockets, cracks, lines or bubbles nor will you have distorted the ear with any manual pressure

22
Q

When the mold exceeds past the second bend what is eliminated and increased

A

Occlusion effect is eliminated and intensity doubles as the distance to the Ear drum is shorter

23
Q

When using the syringe method, what should you do to prevent air pockets, cracks, lines or bubbles

A

Keep the tip of the syringe buried in the impression material while taking the impression—-this is the opposite for Gun method

24
Q

Longer earmold canal increases what? And Shorter decreases what?

A

Response Curve

25
Q

If a pt is complaining of their own voice, background noise, car noise, full ear or harshness of other peoples voice along with when they chew what should be done

A

Larger vent is needed

26
Q

A small pressure vent (0.020 to 0.030) in an earmold will

A

Have little or no effect on frequencies above 400 Hz
Generally reduce levels at frequencies below 200 Hz
Reduce atmospheric pressure build up

27
Q

A long canal on the earmold has the effect of

A

Accentuating the low frequencies

28
Q

Venting an Earmold

A

Is the most common modification made on an earmold

29
Q

The non-occluding earmold is excellent to use on

A

A CROS fitting

30
Q

Earmold have two important parts

A

Outer appearance and canal acoustics

31
Q

The greatest acoustic change in an earmold or ITE is

A

Parallel venting

32
Q

The greatest deciding factors in material selection for an earmold are

A

Power requirements

33
Q

To shift the resonant peak upward between 1500-3000 Hz use

A

Larger bore diameter

34
Q

In general, mold modifications are as follows

A

Venting affects lows, damping the midrange and horn effects boost highs

35
Q

Which molds have the same outer appearance

A

Skeleton and 2 HF

HIS- Hearing Instrument Specialist (20 decks)

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