Amplification - Special Applications

Question 1

What are 5 special HA applications?

Answer 1

1) frequency transposes
2) CROS
3) bone conduction
4) BAHAs
5) ME Implants

Question 2

What are frequency transposers?

Answer 2

Move info from one frequency region to another

Question 3

What do frequency transposed commonly do? Why?

Answer 3

Move high freq speech cues down to lower freq regions, because listener has better sensitivity there

Question 4

What does CROS stand for?

Answer 4

Contralateral Routing of Signal

Question 5

What are CROS systems designed for?

Answer 5

For people with one normal ear and one unaidable ear

Question 6

What do CROS systems do?

Answer 6

Pick up sound from the poor ear and deliver it to the good ear

Question 7

In a CROS system where are the mic and receiver placed and how is the sound transmitted?

Answer 7

Mic is in the poor ears HA
Receiver is in the good ear HA
Sound is transmitted between them via a wire or via FM radio signals

Question 8

What is a specific type of CROS system?

Answer 8

Transcranial

Question 9

What is a transcranial CROS system?

Answer 9

A high gain HA is fit in the poor ear and then is transferred to the good ear using bone-conducation

Question 10

When individuals with conductive HL do need HAs/amp what special application can we use?

Answer 10

Bone conduction

Question 11

What do HAs we fit those with conductive losses do?

Answer 11

Overcome the conductive component of an HA and directly stimulate the inner ear

Question 12

What are 2 cases when conventional HAs wont work for hearing losses?

Answer 12

1) chronically draining ears

2) abnormalities of the external ear

Question 13

When conventional HAs dont work what do we use?

Answer 13

Bone conduction HAs

Question 14

How do bone conduction HAs work?

Answer 14

The standard air-conduction receiver is replaced with a bone-conduction receiver that oscillates the mastoid

Question 15

What are 2 issues of bone-conduction HAs?

Answer 15

1) sound quality

2) uncomfortablitiy

Question 16

Why might bone conduction HAs be uncomfortable?

Answer 16

Metal headband and coupling of oscillator to the mastoid

Question 17

Why can sound quality be an issue in bone conduction HAs

Answer 17

The dynamic range and frequency response of the bone-conduction oscillator is not as good as an air-conduction receiver

Question 18

What solves the sound quality and uncomfortability issues with bone conduction HAs?

Answer 18

bone-anchored HAs

Question 19

How does a BAHA work?

Answer 19

A titanium screw is surgically implanted into the temporal bone behind the pinna, with the processor/vibrator attached to the screw, and the sound vibrations are passed through it into the temporal bone

Question 20

What were BAHA HAs originally designed for?

Answer 20

Individuals with conductive lose who were candidates for bone conduction HAs

Question 21

BAHAs are also approved for people with _______-_______ _________

Answer 21

Single-sided

Deafness

Question 22

How do BAHAs work for individuals with single sided deafness?

Answer 22

The sound is transmitted to the better ear from the processes on the “dead” ear side

Question 23

What are the 2 advantages of BAHAs over bone conduction HAs?

Answer 23

1) Better comfort

2) better sound quality

Question 24

What is the advantage of BAHA over a transcranial CROS?

Answer 24

Better transmission of sound via bone-conduction

Question 25

What are the 2 disadvantages of BAHAs?

Answer 25

1) surgical procedure

2) cost

Question 26

What are the 2 types of special implantable HAs

Answer 26

1) MEI

2) BAHA

Question 27

What are middle ear implants designed for?

Answer 27

Replacements for standard HAs for individuals with sensorineural HL

Question 28

What is the basic premise of how MEIs work?

Answer 28

The devices drive the ossicles directly

Question 29

What are 4 good potentials of MEIs?

Answer 29

1) increased clarity
2) increased understanding in noise
3) decreased feedback
4) no occlusion effect