Step into the journey of scientific fitting: the precise fitting method of hearing aids

所有 Hearing aid All fittings should be completed independently step by step according to the procedures of pre-fitting, fitting and verification.As most hearing aid fitting centers do not have special sound field inspection equipment and places, and the working time and the number of staff are limited, the “verification” step is basically not carried out independently at present, and is often combined in the “fitting” work. .Oversimplification of the fitting procedure at work will affect the quality of fitting. Therefore, under the current working conditions, we must strictly refine what can be refined, and continuously improve the quality of fitting and the level of fitting.

one,Precise fitting refers to the fact that the optician carefully examines the patient’s hearing conditions, correctly selects the parameters of the hearing aid, and strictly verifies the usage according to scientific methods and working procedures, so that the patient can obtain the best fitting effect.

XNUMX. Requirements for accurate matching of hearing aids:

1, Hearing aids have a built-in hearing test function.

2, Hearing aids have a real-ear coupling cavity difference test function.

3, Hearing aids have active feedback interception function.

4, Hearing aids have the function of verification of discomfort threshold.

5, Hearing aids have more than four signal processing channels.

6, Each channel has the adjustment functions of output, overall gain, loud gain, small gain, medium gain, pound point, compression ratio, etc.

7, Hearing aids have data storage function.

8, Hearing aids have several scientific fitting formulas.

Only when hearing aids have the above functions can they be accurately fitted. The lack of some of the above functions causes the fitting technician to only complete extensive fitting.

XNUMX. File Entry for Precise Fitting

1,Name.It must be entered accurately and in the prescribed format.

2,gender.Must be entered accurately.

3, Date of birth.18Before the first birthday, it must be entered accurately in accordance with the prescribed format.18You can not enter after your first birthday.However, accurate entry is recommended.

4, Audiogram.Accurately input the patient’s left and right hearing threshold curve; it is best to input the discomfort threshold curve at the same time;60Enter the left and right discomfort threshold curve as much as possible for the elderly over the age of; if the patient has tested the bone conduction and speech curve, enter it as much as possible.

Fourth, the adjustment steps of fast and accurate fitting (automatic matching)

According to the performance of hearing aids of different manufacturers, the precise fitting can be divided into two types: fast and accurate fitting (automatic matching) and general precision fitting (fast connection, process connection). The fitter can flexibly determine according to their own working conditions.

(XNUMX) Pre-fitting

1, Select “Quick connection”.

2, Determine the fitting formula of hearing aids (generally, the default value shall prevail).

3, Confirm the scene setting of each program.

4,determineT2Function settings.

5, Determine the position setting of the volume potentiometer.

6, Determine the “characteristic” parameters.

7, Determine the volume of the indication sound and the type of speech settings. (Chinese language must be selected)

8, Confirm the power-on delay setting. (Enter the “Optional Summary” column to select, generally select1second)

9, Determine the phone and microphone conversion time settings. (Select “memory”, enter the “advanced” column to select, generally select2second)

10, Check whether the usage log is in the initial state.For the hearing aid used for the first time, select “Enclosed Use Log”.

11, Confirm the touch function setting.

12, Confirm other special function settings.

(XNUMX) Fitting and verification

1, Connect the hearing aid to automatically enter the programming state.

2, Select “Automatic matching”.

3, After entering, select “Real Ear” and perform “Real Ear Test”.At this time, the fitter connects the microphone tube according to the requirements of the software, and conducts the “real ear coupling cavity difference” test in a quiet environment.

4,choose”AFI“, in a quiet environment to carry out “active feedback interception initialization”.

5, Select and carry out the “best fitting”.

6, Select, and perform “reset usage log” (this will be done during the first fitting).

7, After the completion of the above work, according to the patient’s response to the sound level, adjustHearing aid“Gain”.At this point, start to separate the ears on both sides.Usually choose the side with less hearing loss or better speech resolution first.The other ear is muted.Increase or decrease the gain value each time during adjustment3-5 decibel.

8Lin6To adjust the high-frequency gain parameters of the hearing aid to the best value for the test situation of the patient’s high-frequency sound.Increase or decrease each time when adjusting5-10 decibel.

9, Carry out “verification of comfort”, adjust the maximum saturation output to the best value according to the test results.Increase or decrease each time when adjusting3-5 decibel.

10, On the basis of unilateral satisfaction, both sides comprehensively perform fine-tuning of gain.Increase or decrease each time3-5 decibel.

11, Listen to the “phone” function and adjust the relevant parameters.Every increase or decrease3-5 decibel.

12, Carry out the “characteristics” selection.

13, Listen to the “indicating tone”, explain its function, and adjust the relevant parameters.every time5decibel.

14, Audition trial “T2”Function, and teach patients how to use it.

15, According to the observation of the fitter and the reaction of the patient, adjust the customized hearing aid stomata if necessary.The adjustment is generally performed at one end of the sound hole.

16, According to the observation of the fitter and the patient’s feedback, if necessary, trim the shell.

17, Explain the matters needing attention.

Five, the adjustment steps of general precision fitting

Quick and accurate fitting requires some necessary tools, such as a special thin hose for real ear testing; hearing aid stomata must be thick enough to pass through the special thin hose; audiometer should be qualified by the state, and use it to test hearing should be precise.If the fitter determines that the fast and accurate fit cannot be performed according to his own working conditions, he shall change to the general precise fit.

(XNUMX) Pre-fitting

1, Select “Quick connection”.

2, Determine the fitting formula of hearing aids (generally, the default value shall prevail).

3, Confirm the scene setting of each program.

4,determineT2Function settings.

5, Determine the position setting of the volume potentiometer.

6, Determine the “characteristic” parameters.

7, Determine the volume of the indicator sound and the type of speech settings.Generally choose Chinese language.

8, Confirm the power-on delay setting. (Enter the “Optional Summary” column to select, generally select1second)

9, Determine the phone and microphone conversion time settings. (Select “memory”, enter the “advanced” column to select, generally select2second)

10, Check whether the usage log is in the initial state.The first fitting should “reset the usage log”.

11, Confirm the touch function setting.

12, Confirm other special function settings.

(XNUMX) Fitting and verification

1, Connect the hearing aid to automatically enter the fitting procedure.

2, Select “Quick connection”.

3, Select “Best selection of advanced features of all memory and hearing aids”.

4, According to the patient’s response to the sound level, simply adjust the gain parameters of the whole machine.General increase or decrease3-5 decibel.

5, Select “Audiometer”, select “Pulse Tone” to perform pure tone “threshold” test on the patient.

6, Select “audiometer”, select “pulse tone” to perform pure tone “discomfort threshold” on the patientUCL“test.

7, Select “Update according to built-in audiogram”.

8, Select “According to the best selection of built-in audiogram”.

9, Re-enter the “Quick Matching” interface, adjust the gain parameters of the whole machine on both sides according to the patient’s response to the sound level.The following is divided into two sides separately.Usually choose the side with the lighter hearing loss to adjust first.”Mute” on the other side.Increase or decrease at one time during adjustment3-5 decibel.

10According to Lin’s6To adjust the high-frequency gain parameters of the hearing aid to the best value for the test situation of the patient’s high-frequency sound.Increase or decrease at one time during adjustment5-10 decibel.First from4000HzAdd up, if you still can’t hear it after adding it all to the full range, expand it to3000HzContinue to increase the high frequency gain.It can be expanded to2000HzContinue to increase the high frequency gain.If you still can’t hear after filling up, you don’t need to add it again, which means that the patient’s high-frequency hair cells are no longer working.At this time, if necessary, the high-frequency gain can be reduced conversely.The patient only uses medium and low frequency work.The speech discrimination ability of such patients generally does not exceed96%.But he himself already feels that it is very helpful.

11, Select “Verify comfort”, and adjust the maximum saturation output to the best value according to the result.Increase or decrease at one time during adjustment5decibel.

12, In the case of satisfactory adjustment on both sides, adjust the situation of working on both sides at the same time.At this time, the gain is mainly adjusted.Increase or decrease each time3-5 decibel.

13, Listen to the “phone” function and adjust the relevant parameters.Increase or decrease each time when adjusting5decibel.

14, Carry out “active feedback cut off” initialization.Check whether the headroom gain of each program is reasonable.Make the necessary adjustments.

15, Listen to the “indicating tone”, explain its function, and make adjustments.Every increase or decrease5decibel.

16, Audition, trial “T2“Function, and teach how to use it.

17, According to the observation of the fitter and the patient’s response, adjust the custom-made hearing aid stomata when necessary.Blocking the stomata is generally done at one end of the sound outlet.

18, According to the observation of the fitter and the patient’s feedback, if necessary, trim the shell.

19, Explain the matters needing attention.

Sixth, a summary of the ideas of the precise fitting workflow

(XNUMX) Pre-fitting.The first stage of this stage is to input user information in order to obtain accurate fitting parameters provided by the computer.The focus of this work is to do the accurate entry of name, gender, age, and audiogram.The second is to pre-select the main functions of hearing aids. The focus of this work is to set up formulas, memory, and indication sounds; observe the location of the hearing aid parameters during automatic selection; visual inspection; sound inspection.To ensure that the user wears smoothly.

(XNUMX) Fitting and verification.This stage is the actual debugging and verification of the hearing aid effect.Separate the two ears separately, the content is the same, if you choose to mute.After adjusting separately, carry out bilateral comprehensive adjustment.Increase or decrease each time5Around decibels.

1, Re-test the built-in audiometer.Built-in audiometry for threshold and discomfort threshold must be performed.In order to obtain the most accurate test results.

2, Adjust the gain of the whole machine.With the appropriate amplification of the hearing aid, the user is satisfied and satisfied with the sound level of the hearing aid.Use the language test method.Make precise adjustments on both sides of the ear. First select the ear with better hearing, and the other ear can be muted.Adjustment amount each time3-5 decibel.

3, Adjust the high and low frequency gain ratio of the whole machine.It is suitable for a hearing aid to amplify the voice frequency band, and the hearing aid has the clearest amplification ability.The user hears that the tone is suitable.Use Lin’s six-tones,shBoth unvoiced and voiced consonants were tested.Every increase or decrease5-10 decibel.Under normal circumstances, the high frequency gain only increases4000HzThe gain of the above frequencies can be extended to increase if the problem cannot be solved3000Hzeven2000HzHigh frequency gain at the above frequencies.If you still cannot hear the unvoiced consonant, you don’t need to increase it, indicating that the patient’s high-frequency hair cells are no longer working.However, no conclusions can be drawn first without additional testing.This increase and testing must be done.

4, Adjust the saturation output of the whole machine.By verifying the comfort level, the maximum output value is accurately determined.Ensure that users are comfortable and clear.Every increase or decrease5decibel.

5, Adjust the gain comprehensively on both sides, and fine-tune it.Every increase or decrease3-5 decibel.

6, Adjust the user’s answering call parameters.Ensure that the phone answering function can be used correctly.Use normal voice calls, such as dialing10000Number audition.Increase or decrease each time5decibel.

7, Demonstration indicator sound.Ensure that users can correctly understand and use.Increase or decrease5decibel.

8, Initialize the feedback cut-off system.In order to have a good feedback cut-off function in future use.

9, When necessary, special functions are used.Such as program buttons,T2Function etc.

10、Teach the usage method and matters needing attention.

We can see from the above that the core of precise fitting is to strictly and conscientiously follow the scientific process to do every step.I hope that the inspectors will take a closer look and analyze them in practice to see what they should do.As a result, we unify our understanding, standardize our fitting work, unify our fitting work in a scientific and standardized fitting procedure, and finally enter the journey of scientific fitting.

Link:      Step into the journey of scientific fitting: the precise fitting method of hearing aids

REF: Hearing AidsITE hearing aidsDigital Hearing Aids
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