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TYPE OF HEARING AIDS, IT'S CARE & MAINTENANCE
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.TYPE OF HEARING AIDS
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Pocket Model :  

Worn in a pocket or harness at chest level. It consists of the body of the hearing aid containing the microphone, amplifier and controls. A cord transmits the electrical output to a receiver, which converts this signal into sound. The receiver is attached to a mould, which holds it in place.

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Behind the Ear (BTE): 

The body of the instrument is worn behind the ear. It ‘hooks’ over the pinna. It is attached via plastic tubing to an earmould, which holds it in place in the ear.

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In the Ear (ITE): 

The complete hearing aid is in the ear or ear canal. The hearing aid is housed in a hard plastic shell which is often custom made by taking an ear impression.

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Spectacle Type: 

The hearing aid components are incorporated within a spectacle frame. It is useful for persons who require glasses along with hearing aids.

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Bone Conduction (BC) hearing aid:
 This is used when the ear canal is blocked or in cases where conventional amplification as described above cannot be given. A BC vibrator is placed on the mastoid bone behind the ear. It converts the amplified electrical signal into vibrations. BC vibrator can be used with body level, BTE or spectacle hearing aids.

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Hearing aids should always be used with custom-made ear moulds. Ear moulds are devices, which couple the hearing aids to the ear. Ear moulds can be of hard or soft material.


DIFFERENT TYPES OF HEARING AIDS AVAILABLE IN THE MARKET :

Sr. No. Types of Hearing Aids
Range of approximate cost Rupees per piece as on October,2001

Body level types

 

Rs. 900/- to Rs.9900/-

2.

Ear level types

a) Behind the ear (BTE)



b) Spectacle Type 

Rs.4000 /- to
Rs.20,500/-
(Non Programmable)

Rs.14, 000/-
To Rs. 17,500/-

3.  

In the Ear

a) ITE
    (Non programmable)

b) In the Canal (ITC)
    (Non programmable)

c) Completely – In the canal 
    (ITC) 
    (Non programmable)

Rs.8000/- to Rs.13,200/-


Rs.8500/- to Rs.20, 000


Rs. 9500/- to 
Rs. 21,000/-


Please Note: 

1. 

Hearing aids have different ‘Powers’ and ‘features’. The hearing aid which has the ‘right’ power and features for a particular user will provide maximum benefit. Therefore, hearing aids should always be purchased after under going a trial.

2.  Hearing aids can be worn in one ear or both ears according to the hearing loss.
3. 

The best performance of the hearing aid can be obtained only when you use the hearing aid with ear moulds made for your ears.

4. 

The hearing aids may be simple ‘analog’ type or they may be digital. Digital hearing aids are much more expensive.

5.  Hearing aids run on batteries. The life span and cost of different types of batteries are as follows:
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Type of Cell
Estimated average battery life How many per month, if used during the working hours Approximate cost/piece

i) Pen torch cell
( for body level aids)

ii) Button Cell 
a) 675 High power  (mercury)
( Zn 02-Varta)

b) 312


c) 13

100 hrs


300 hrs
330 hrs

25 hrs

ITE 415 with Zinc Air 285-330

288 hrs. with 
Zinc-Air

Every week


Twice a month




Every week


Every 4/5 days

Rs.7/-


Rs. 30/- to Rs.50/-




Rs.40/-


Rs.40/-

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.CARE & MAINTENANCE OF HEARING AIDS
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TIPS FOR HEARING AIDS  CARE :

Prevent it from falling down 
Don’t spill liquids on the hearing aid
The hearing aid should be fitted well – pocket model aid in a harness and BTE with appropriate moulds and retainers if needed.
Cords should not be twisted or knotted.
Protect it from dust, dirt & heat.
Remove the battery from the hearing aid when it is not in use.
Remember to detach the earmould from the receiver before washing the mould. The receiver should not come in contact with water. 
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TROUBLE SHOOTING FOR BODY WORN HEARING AIDS :

Problem  Possible cause  Solution 

No out put from
the hearing aid

1) Battery is drained
2) Battery inserted wrongly
3) Mould blocked with wax
4) Faulty receiver
5) Faulty switch
6) Electronic fault
7) Broken battery contacts
8) Broken /faulty cords

Change battery 
Reverse + ve & -ve 
Clean mould by washing
Change receiver
Send for repairs
Send for repairs
Send for repairs
Replace cords

Aid is working but gives only a sound of rushing air

1) Aid switched to ‘T’ 
    Position.
2) Damaged microphone 
    or connection

Set it to ‘M’ position 

Send for repairs

Low output or distorted sound

1) Low battery
2) Crack in receiver
3) Partially blocked mould
4) Faulty switches or  
   volume control

Change battery
Change receiver
Clean the mould
Send for repair

Works intermittently 

1) Faulty cords
2) Loose connections/  
   Sockets.
3) Faulty/dirty switches
4) Inappropriate battery
    contact 

Replace cords
Send for repair

Send for repair
Use battery of correct size. If problem is not rectified send for repair

Air ‘rattles’ when shaken

1) Loose microphone
2) Loose screws

Send for repairs

Aid gives feedback signal when worn

1. Poorly fitting moulds
2. Earmould not worn  
    properly
3. Cracked receiver
4. Missing washer on 
    receiver
5. Volume kept on 
    maximum
6. High necked clothes 
    which  cause mould to 
    come out.

New moulds needed
Fit properly

Replace receiver
Put new washer

Reduce volume to correct level.
Rectify

TROUBLE SHOOTING FOR BTE HEARING AIDS :

Problem Possible cause Solution

No out put from aid

1. Battery is drained
2. Battery inserted wrongly
3. Mould blocked with wax.
4. Faulty switches
5. Electronic fault
6. Flat or twisted tubing
7. Broken battery 
   connections

Change battery
Reverse +ve & -ve
Clean mould
Send for repairs
Send for repairs
Change tubing
Send for repairs

Aid works but gives only a gushing sound

1. Aid switched to ‘T’
2. Mic damaged or broken

Switch to M
Send for repair

Poor or distorted sound output

1. Partially blocked  mould
2. Low battery
3. Electronic fault

Clean mould
Change battery
Send for repairs

Aid works intermittently

Faulty switches or other fault 

Send for repairs

Aid rattles when shaken

1. Microphone or receiver  
    loose
2. Internal mounting loose

Send for repairs

Send for repairs

Aid gives a feed back
signal when worn

1. Poorly fitting mould
2. Incorrectly fitting mould
3. High volume

4. High necked garment  
   pushing mould or aid   
   out  of  position
5. Hole or cut in tubing
6. Crack in the body
Make new mould
Fit properly
Set volume control correctly

Rectify


Replace tubing 
Send for repairs

Aid causes soreness on the ear

Short tubing length

Use correct tubing length

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CAUTION 

The trouble shooting chart aids to give you tips to solve only very simple practical problems. If you cannot rectify the problem using the methods suggested, do not try to do any repairs on your own. Go to a qualified electronic technician or your hearing aid dealer/service agent. Hearing aids will last longer and provide better sound quality if they are regularly serviced and any problems rectified at the earliest.

 

.CARE & MAINTENANCE OF EAR MOULDS
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1.  Keep the moulds clean and free of dirt or ear wax. Blocked moulds result in poor sound reception. Dirt may lead to infection in the ear. 
2. Wash the ear mould in soapy water and clean the dirt with a wire or tooth brush. Use it only after it dries completely.
3.  Do not press the mould hard over the receiver ( in pocket model aids) as this can damage the receiver.
4. 

Replace moulds when they become loose/child can not wear the hearing aid at the normal volume level due to a squealing sound. In young children, moulds may need frequent changing ( some times even once in 4-6 months) as the size and shape of ear canal changes with growth.

5.  The mould should not be removed very often from the receiver as the spring loses its tension. However remember to detach and remove the receiver before washing the earmould.
6. 

The mould should be properly seated in place so that no sound leakage is present. If the mould is slightly loose, a little cotton, sponge or fabric may be placed in between the receiver and mould for tight sitting and sealing. This would also minimize the sound leak.

7.  If the child shows any skin reaction after using the mould consult the ENT specialist.

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