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Maico MI 24 Operating Instructions Manual

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MI 24, MI 24h

Operating Instructions

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MAICO Diagnostics | 10393 West 70
Street | Eden Prairie, MN 55344, USA | Toll Free 888.941.4201

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Summary of Contents for Maico MI 24

  • Page 1: Operating Instructions

    MI 24, MI 24h Operating Instructions MAICO Diagnostics | 10393 West 70 Street | Eden Prairie, MN 55344, USA | Toll Free 888.941.4201...

  • Page 2: Table Of Contents

    How to measure the Stapedius reflex Interpreting test results How to test children Additional Reading 10. Individual setup of the MI 24 11. Care and maintenance of the instrument 12. How to change the printer paper 13. Warranty, maintenance and after-sales service 14.

  • Page 3: Introduction

    1 Introduction Thank you very much for purchasing a quality product from the family. This automatic Tympanometer MI 24 is manufactured to meet all quality and safety requirements. This user manual should make it as easy as possible for you to become familiar with the functions of the MI 24.

  • Page 4: Description

    Contralateral acoustic reflex is available as an option. Test results are displayed on the front panel LCD (liquid crystal display) screen and may be printed. The design of the MI 24 allows rapid and reliable measurements. This equipment is designed for middle ear function screening. PC-Interface: A USB interface for data transfer to a connected computer is built in.
  • Page 5 Operating Instructions MI 24, MI 24h NOTE: 1.02 mm H O = 1.0 daPa.
  • Page 6 Operating Instructions MI 24, MI 24h 2.2 Acoustic Reflex An acoustic reflex, or contraction of the Stapedial muscle, occurs under normal conditions when a sufficiently intense sound is presented to the auditory pathway. This contraction of the muscle causes a stiffening of the ossicular chain which changes the compliance of the middle ear system.

  • Page 7: Getting Started

    Operating Instructions MI 24, MI 24h 3 Getting started Your MI 24 was carefully inspected and packed for shipping. However, it is good practice to thoroughly inspect the outside of the shipping container for signs of damage. If any damage is noted, please notify the carrier immediately.
  • Page 8 Operating Instructions MI 24, MI 24h...
  • Page 9 Operating Instructions MI 24, MI 24h 3.2 Environmental conditions for the MI 24 The MI 24 should be operated in a quiet room. The test room must be at normal temperature, usually 15° C / 59° F to 35° C / 95° F, and the instrument should be switched on about 10 minutes before the first measurement to guarantee precise measuring results.
  • Page 10 Operating Instructions MI 24, MI 24h Getting familiar with the MI 24 Figure 3 The controls of the MI 24 The MI 24 Front Panel Controls 3.4.1 See the following keys: 1. PRINT = Printout 2. L/R = Switch over left/right ear 3.
  • Page 11 Operating Instructions MI 24, MI 24h 24."...
  • Page 12 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 first measurement to guarantee precise measuring results. If the device has been cooled down (e.g. during...
  • Page 13 Operating Instructions MI 24, MI 24h 3.4.4 The display of the MI 24 The test result is shown during the measurement on the LCD. The measurements are saved automatically and can be printed out in a fast and quiet way with the integrated printer.
  • Page 14 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 Calibration the tympanometry mode. The basic menu Place the probe in the .5 ml cavity.
  • Page 15 Operating Instructions MI 24, MI 24h 3.6 Getting familiar with the probe The probe of the MI 24 is shown in figure 8. The probe head is adjustable to three angles (0°, 60° and 80°). It is adjusted by turning the locking screw at the bottom of the probe using a coin or a screw driver.
  • Page 16 Operating Instructions MI 24, MI 24h If the probe tip is clogged, you can remove it by opening the fixation ring . After cleaning the probe tip or attaching a new one, the tip must be fixed again by fastening the fixation ring.

  • Page 17: How To Create A Tympanogram

    Operating Instructions MI 24, MI 24h How to create a tympanogram In the following paragraph we will briefly explain the principle and the background of the impedance measurement to create a better understanding. If you want to begin the measurements immediately, just skip this paragraph and continue reading section 4.3 “Preparing the Measurements.”...
  • Page 18 Operating Instructions MI 24, MI 24h The impedance measurement examines the acoustic resistance of the middle ear. If the eardrum is hit by a sound, part of the sound is absorbed and sent via middle ear to the inner ear while the other part of the sound is reflected. The stiffer the eardrum is the more sound is reflected and the less sound reaches the inner ear.
  • Page 19 Operating Instructions MI 24, MI 24h 4.2 Preparing the patient Explain to the patient that the measurement is painless and that nothing enters the auditory canal. The patient does not have to respond when there are loud test sounds or when the pressure in the auditory canal changes. In no case should the patient swallow, chew or move during the measurement.
  • Page 20 Operating Instructions MI 24, MI 24h 4.5 How to evaluate the tympanogram display After having completed Impedance Right Tympanometer Status READY measurement you can see the Ear Volume 0.94 ml Compliance 0.81 ml Pressure results on the LCD. - 37 daPa...
  • Page 21 Operating Instructions MI 24, MI 24h 4.6 How to print the test result After the end of a test you can print the results for your records by pressing the Print button . The quiet thermal printer prints out the example used in the previous paragraph in only six seconds.
  • Page 22 Operating Instructions MI 24, MI 24h How to create a tympanogram with high probe tone In addition to the standard 226 Hz probe tone tympanometry, the MI 24h has a higher frequency probe tone that can be selected by the user. A tympanogram recorded using the high probe tone is generally better suited for screening newborns and provides more accurate results for those subjects.

  • Page 23: How To Measure The Stapedius Reflex

    Operating Instructions MI 24, MI 24h 6 How to measure the Stapedius reflex 6.1 The basics of the Stapedius reflex measurement While tympanometry measures the musculus stapedius hearing change of the compliance caused by nerve middle changing pressure outer bones...
  • Page 24 Operating Instructions MI 24, MI 24h 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 Auto with a starting level of 70 or 80 dB If you choose Auto, the MI 24 starts with the preset level and increases the level automatically until a reflex is registered or the maximum value is reached. You can choose your individual starting level and maximum level.
  • Page 26 If a Stapedius reflex occurs, the compliance increases and the curve rises. The box which appears during the test symbolizes the threshold at which the MI 24 accepts a change of compliance as a valid Stapedius reflex...
  • Page 27 Operating Instructions MI 24, MI 24h 6.5 Preparing the contralateral measurement (optional) Switch on the contralateral reflex Impedance Right Contra Status READY measurement by pressing the Reflex Ear Volume 0.94 ml Compliance 0.81 ml Pressure - 37 daPa key (the word Contra must appear on...
  • Page 28 Operating Instructions MI 24, MI 24h How to print the test results After a test, print the results for MAICO MI 24 Id No.: Date: Name: Examiner: your documents by pressing the Remarks: Tympanogram Right Print button. The printer prints 0.94 ml...

  • Page 29: Interpreting Test Results

    Operating Instructions MI 24, MI 24h 7 Interpreting Test Results 7.1 Understanding the printout The printout contains the following MAICO MI 24 Id No.: Date: Name: Examiner: Remarks: information: Tympanogram Right 0.94 ml  Ear volume 0.81 ml - 37 daPa...
  • Page 30 The MI 24 may refuse to run the test, with the probe indicating a volume out of tolerance by illuminating the red light, or a flat tympanogram will be recorded since no movement will occur with a change in air pressure.
  • Page 31 Operating Instructions MI 24, MI 24h Middle ear fluid such as in serious otitis media will yield a very flat tympanogram with no definite peak and negative air pressure. A resolving case or beginning case may produce 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.

  • Page 32: How To Test Children

    Operating Instructions MI 24, MI 24h 8 How to test children When practicing impedance measurement with small children, be aware of problems caused by the child being restless or afraid of the examination or reacting sensitively to the change of pressure and the loud test sound.

  • Page 33: Additional Reading

    Operating Instructions MI 24, MI 24h 9 Additional Reading Auditory Disorders: A Manual for Clinical Evaluation Jerger, 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.
  • Page 34 Operating Instructions MI 24, MI 24h 10 Individual Setup of the MI 24 The MI 24 offers many options for the experienced user to adapt the instrument to individual demands. Main Menu The settings shown in the figures are the Tympanometry : standard settings.
  • Page 35 Operating Instructions MI 24, MI 24h 10.2 The tympanometer setup Select the menu option Tympanometry Setup Menu as illustrated in figure and the Tympanometer Setup Menu will appear on the LCD. Change the menu options with the up/down cursor keys.
  • Page 36 Operating Instructions MI 24, MI 24h 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 2000 Hz : On 4000 Hz : On With this option you can choose the maximum acoustic pressure level the MI 24 uses if the  Change item automatic identification of the reflex threshold is  Change item setting MENU Exit switched on.
  • Page 38 Select the menu option Common Setup Menu from the main setup menu. The common setup menu offers the following options. Power-up: Common Setup Menu Choose the test mode of the MI 24 after Power-up : Tymp and Reflex switching on. With the Tymp setting, only...
  • Page 39 Operating Instructions MI 24, MI 24h Language : You can choose one of the following languages: German, French, English or Spanish for the text on the LCD and the printout. After selection all the texts appear in the chosen language.

  • Page 40: Care And Maintenance Of The Instrument

    Operating Instructions MI 24, MI 24h 11 Care and maintenance of the instrument Disconnect the power plug before 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 the area clean.

  • Page 41: How To Change The Printer Paper

    Close the printer cover by putting the two guide rails at the end of the printer cover into their appropriate slots in the paper compartment of the housing of the MI 24. Press the front of the printer cover down until it fastens.

  • Page 42: Warranty, Maintenance And After-Sales Service

    WARNING: The Maico MI 24 is designed to be used with a hospital grade outlet. Injury to personnel or damage to equipment can result when a three-prong to two-prong adapter is connected between the power plug and an AC outlet or extension...
  • Page 43 Operating Instructions MI 24, MI 24h 13.2 Maintenance The MI 24 is designed to require minimal maintenance and should provide you with years of trouble-free use. The following suggestions may assist you in avoiding and/or solving problems. Calibration: The optimum length of time between recalibrations for impedance meters or audiometers varies, depending upon the treatment given the instrument and the headphones/probe.
  • Page 44 Ship, prepaid, to your Maico Special Instrument service center. NOTE: Warranty service is provided by your authorized Maico Special Instruments Distributor. DO NOT ATTEMPT TO REMOVE THE INSTRUMENT CASE YOURSELF.

  • Page 45: Safety Regulations

    Operating Instructions MI 24, MI 24h 14 Safety regulations 14.1 Electrical safety: The MI 24 tympanometer is constructed to comply with protection class II of the international standard IEC 601-1 (EN 60601-1). The instruments are not intended for operation in areas with an explosion hazard.
  • Page 46 Operating Instructions MI 24, MI 24h 15 Checklist for subjective device control According to the manufacturer requirements, the user should test the instrument once a week. This is to find errors immediately and to avoid inaccurate test results. This test should test tympanogram and reflex with an otologic normal person and compare the results with earlier measurements.
  • Page 47 Operating Instructions MI 24, MI 24h Tested by: Date:...

  • Page 48: Technical Data

    Operating Instructions MI 24, MI 24h 16 Technical Data and Accessories Impedance measurement: Type: Clas 2 acc. to ANSI S3.39 Tympanometer: Test frequency: 226 Hz ± 1% Test level: 85 dB in 2 cm Pressure range: +200 to -400 daPa Volume range: 0.1 to 6.0 ml...
  • Page 49 Operating Instructions MI 24, MI 24h...
  • Page 50 Operating Instructions MI 24, MI 24h Figure 4 Connectors on the rear of the MI 24 Connection plugs: A. Power socket B. Pressure tube C. Probe D. USB PC-interface E. Contralateral phone (option) Warm up time: less than 10 minutes after power on...
  • Page 51 Operating Instructions MI 24, MI 24h Accessories: Standard: 1 hand-held probe 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.
  • Page 52 Operating Instructions MI 24, MI 24h...
  • Page 53 1162-0321 REV. E 07/07...

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Mi 24h

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