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Maico MI 24, Operating Instructions Manual

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Operating Instructions MI 24, MI 24h 

 
 
 
 

 

 

i

 

Table of Contents                               

            

                    

Page  

1.

 

Introduction   

   

 

 

  

  

 

 1 

2.

 

Description  

 

   

 

 

 

 

 

 2 

3.

 

Getting started      

   

 

 

 

 

 

 4   

4.

 

How to create a tympanogram 

 

 

 

 

12 

5.

 

How to create a tympanogram with high probe tone (MI 24h) 

17 

6.

 

How to measure the Stapedius reflex    

 

 

18 

7.

 

Interpreting test results   

 

 

 

 

  

23   

8.

 

How to test children     

 

 

 

 

 

26   

9.

 

Additional Reading 

   

 

 

 

 

 

27 

10.

 

Individual setup of the MI 24  

 

 

 

 

28 

11.

 

Care and maintenance of the instrument 

 

 

33   

12.

 

How to change the printer paper    

 

 

 

34   

13.

 

Warranty, maintenance and after-sales service  

 

35 

14.

 

Safety regulations 

   

 

 

 

 

 

38 

15.

 

Subjective checklist     

 

 

 

 

 

39 

16.

 

Technical data   

   

 

 

 

 

 

40

Summary of Contents for MI 24

Page 1: ...MAICO Diagnostics 10393 West 70th Street Eden Prairie MN 55344 USA Toll Free 888 941 4201 MI 24 MI 24h Operating Instructions...

Page 2: ...probe tone MI 24h 17 6 How to measure the Stapedius reflex 18 7 Interpreting test results 23 8 How to test children 26 9 Additional Reading 27 10 Individual setup of the MI 24 28 11 Care and maintena...

Page 3: ...requirements This user manual should make it as easy as possible for you to become familiar with the functions of the MI 24 The description of the position e g of controls displays and connections fo...

Page 4: ...mpliance in the middle ear system while the air pressure is varied automatically from a positive value 200 daPa to a negative value 400 daPa max Maximum compliance of the middle ear system occurs when...

Page 5: ...Operating Instructions MI 24 MI 24h 3 NOTE 1 02 mm H2O 1 0 daPa...

Page 6: ...ears the reflex is referred to as a contralateral acoustic reflex For best results this reflex measurement is automatically conducted at the air pressure value where the compliance peak occurred duri...

Page 7: ...eted the inspection notify the MAICO Special Instrument Distributor you purchased this unit from Save all the original packing material and the shipping container so the instrument can be properly pac...

Page 8: ...Operating Instructions MI 24 MI 24h 6...

Page 9: ...during transport please wait until it has warmed up to room temperature 3 3 Preparing the MI 24 for use 3 3 1 Connect probe and accessories Connect the probe cable to socket on the rear of the instru...

Page 10: ...t 2 L R Switch over left right ear 3 REFLEX Reflex measure off ipsi contra 4 MENU 5 LEFT Left cursor control 6 DOWN Down cursor control 7 RIGHT Right cursor control 8 UP Up cursor control 9 ENTER Ente...

Page 11: ...Operating Instructions MI 24 MI 24h 9 24...

Page 12: ...Turn the power switch on The LCD will show the type of instrument and software version for a moment Then the basic measuring figure appears The MI 24 should be switched on about 10 minutes before the...

Page 13: ...hat probe is blocked in the ear LEAKING indicates that the ear tip does not have a proper seal The boxes below Status show the volume of the ear canal the compliance the pressure at maximum compliance...

Page 14: ...rted for the 2 ml calibration Put the probe tip in the 2 ml cavity Do this again for the 5 ml volume The MI 24 will automatically change into the tympanometry mode The basic menu for the impedance mea...

Page 15: ...probe until the green control light goes out indicating the end of the measurement A blue control light indicates that the left ear is selected The system is ready for measurements As soon as you have...

Page 16: ...ar tip tightly on the probe tip The probe tip should end near the end of the ear tip It should not be inserted more than about 1 mm inside the ear tip or just protrude out of the ear tip see Figure 9...

Page 17: ...ot be compared directly with other audiometric tests such as sound or speech audiometry which assists in the measurement of hearing Furthermore the impedance measurement is an objective measuring meth...

Page 18: ...nnected with tube C Less sound is reflected to the microphone when the eardrum is stiff and the eardrum transmits the majority of the sound via the middle ear to the inner ear The highest compliance i...

Page 19: ...anogram Take hold of the top of the outer ear and pull it back Insert the probe with the ear tip into the auditory canal until the control light of the probe is green indicating the start of the test...

Page 20: ...s been switched off In the boxes to the right the following test measurements are displayed Ear Volume indicates the volume of the section of the auditory canal between the ear tip and the eardrum in...

Page 21: ...ly print out what was actually measured The printout in the example above does not show reflex frequencies because only the tympanogram was measured If you have saved two tympanograms for example both...

Page 22: ...robe tone tympanometry looks very similar to the normal tympanometry mode however the following differences will appear on the screen The scaling is now measured in mmho The pre selected frequency 100...

Page 23: ...was caused before the highest compliance measurement Simultaneously the stimulus ear is irritated by the sound which causes the contraction of the Stapedius muscle The ipsilateral reflex measurement u...

Page 24: ...Operating Instructions MI 24 MI 24h 22 measurement It is very important that the patient does not move because a reflex can be registered with a change of compliance of 0 05 ml...

Page 25: ...selected level in dB Figure 19 80 dB appears The I indicates that an ipsilateral test is selected You can choose between the fixed levels 70 75 80 85 90 95 and 100 dBHL and Auto with a starting level...

Page 26: ...was detected a Fail is reported and the maximum level is shown You can judge this by watching the real time graph if you have a real Stapedius reflex or only disturbance and artifacts The lower dotte...

Page 27: ...y In the four boxes marked 1 to 4 the Stapedius response is shown graphically Below each box the test level the test frequency and the type of the test I ipsi C contralateral are shown The test result...

Page 28: ...at which a reflex had been measured appears below the graph If no reflex was registered Fail is printed on the top of the graph behind the test frequency 0 94 ml 0 81 ml 37 daPa 32 daPa ml 3 2 1 0 60...

Page 29: ...ws the changes in air pressure and the resulting mobility of the system The compliance is recorded on the vertical axis This mobility is expressed as a change in the volume of the ear canal in ml The...

Page 30: ...of greater than 150 daPa indicates a referral for medical evaluation A normal tympanogram is shown on the previous page in figure 24 7 3 Abnormal Values It is the purpose of this section to provide s...

Page 31: ...uce a reduced peak in the presence of severe negative middle ear pressure The ear canal volume is normal and the reflex is either absent or at an elevated level Eustachian tube dysfunction in the abse...

Page 32: ...o create a probe seal with restless children If the child yawns or cries the instrument will not have stable pressure in the outer auditory canal In addition speaking causes Stapedius muscle reflexes...

Page 33: ...erger Susan and James Jerger Boston College Hill Press 1981 Handbook of Clinical Audiology Katz Jack Baltimore William Wilkins 1994 Roeser s Audiology Desk Reference Roeser Ross J New York Stuttgart T...

Page 34: ...u options with the up down left right cursor keys The menu option selected is highlighted on the LCD Setup in Figure 25 Accept the chosen menu option by pressing Enter 10 1 The setup menu Select the m...

Page 35: ...reen Values can be set between 0 daPa and 200 daPa in steps of 25 daPa Press Limit lo With this option you can set the left limit of the normative box displayed on the tympanogram test screen Values c...

Page 36: ...Operating Instructions MI 24 MI 24h 34 tympanogram test screen Values can be set between 0 1 ml and 1 0 ml in steps of 0 1 ml To leave the Tympanometry Setup Menu press the Menu button...

Page 37: ...ion select the sensitivity of the Stapedius reflex detection The Sensitive setting will achieve Pass as test results with very small compliance changes i e 0 03ml The Normal setting is the default set...

Page 38: ...and restarted with the probe button L R or Pause both the test ear and the test can be selected paused and restarted with the probe button or off Subject Data Printout Turn the printout of the headlin...

Page 39: ...After selection all the texts appear in the chosen language Display adjust The contrast of the LCD can be changed with this option 10 5 Insert your personal printout data Select the menu option Clini...

Page 40: ...cleaning To clean the instrument probe contralateral receiver and other accessories use a soft damp cloth use warm soapy water no liquids containing alcohol or ammonia should be used to gently wipe t...

Page 41: ...because it is only coated on one side If it is inserted wrong no printout will be visible Gently insert the paper end in between the rubber roll and the black plastic part at the rear of the printer F...

Page 42: ...to return the MI 24 to the Maico Special Instrument Distributor from whom it was purchased or directly to Maico after receiving a return authorization This warranty does not cover breakage or failure...

Page 43: ...diometer s calibration may be in error perform a biological check on a known ear If all retests show major changes calibration is probably in error All repair and recalibration should be done at an au...

Page 44: ...instrument in the original shipping carton using the packaging provided Be sure to include all accessories as they are required for proper calibration 2 Enclose an explanatory letter describing the se...

Page 45: ...tympanometer works properly the instrument has to be checked and calibrated at least once a year The service and calibration must be performed by an authorized service center The use of non calibrate...

Page 46: ...strument test The test person should be healthy no otitis etc and should not be exposed to loud noise for at least 12 hours before the test The instrument must be calibrated according to chapter 3 5 o...

Page 47: ...Operating Instructions MI 24 MI 24h 45 Tested by Date...

Page 48: ...o 105 dBHL High freq option for 4 kHz to 105 dBHL Test level contralat 70 dBHL to 110 dBHL High freq option for 4 kHz to 105 dBHL Attack release time Typical 10 ms ON OFF Ratio Greater than 70 dB Pres...

Page 49: ...Operating Instructions MI 24 MI 24h 47...

Page 50: ...option Warm up time less than 10 minutes after power on Environment conditions 15 to 35 C 59 to 95 F operation 5 to 50 C 41 to 122 F storage Maximum humidity 90 storage and operation Dimensions 15 W...

Page 51: ...e 1 power cable 1 set of ear tips 1 calibration cavities cavities 5ml 2ml 0 5ml 1 printer paper roll for app 350 printouts Consumable 1 roll printer paper Part No 5529 4 pc ear tips yellow 7 mm Part N...

Page 52: ...Operating Instructions MI 24 MI 24h 50...

Page 53: ...1162 0321 REV E 07 07...

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