Welch Allyn MicroTymp Operating Instructions Manual
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Welch Allyn MicroTymp Operating Instructions Manual

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Summary of Contents for Welch Allyn MicroTymp

  • Page 1 Welch Allyn Printer/Charger Operating Instructions...

  • Page 2: Table Of Contents

    Welch Allyn Thank you for purchasing the Welch Allyn MicroTymp. The operating and maintenance instructions found in this manual followed to should be ensure many years of accurate and reliable service. Please read these instructions thoroughly before using your new MicroTymp.
  • Page 3 The Welch Allyn MicroTymp is a single-component aural acoustic admittance meter that records a tympanogram with a 226-Hz probe tone. In order, to properly use the MicroTymp and to interpret the results correctly, the user should be familiar with the basic...
  • Page 4 Tympanometry is the measurement of acoustic admittance as a function of ear canal air pressure. The resulting graph is a tympano- gram. Because ear canal air pressure changes the admittance of the middle ear, the admittance of the air in the ear canal changes when the ear is pressurized.

  • Page 5: Parts

    Parts of the MicroTymp Display Memory Buttons Ejector Button Battery Cover - - R e f e r e n c e Label - C h a r g i n g...

  • Page 6: Operation

    The RUN symbol will flash at the top of the screen. NOTE: The MicroTymp will automatically turn OFF 40 seconds after the last test or activation of any button. 3. Examine the subject’s ear canal opening. Select a tip of ade- quate size to seal the entrance of the ear canal.

  • Page 7: Operation

    4. Grasp the subject’s pinna. Pull gently up and back to straighten the ear canal (or straight back for children). 5. While maintaining tension on the pinna, press the tip firmly against the ear canal opening. The tip should point straight into the ear canal for adults and slightly anteriorly for children.
  • Page 8 appear, reposition probe to start again. For further explanation, and in case of other symbols, see Display Symbols (pg. 9) for interpretation. 7. Test is complete when RUN ( =s) symbol disappears, and ON/READY ( <I> ) symbol reappears. Typical test takes approximately 3 seconds.
  • Page 9 3 seconds. BLANK symbol will appear. MEMORY (-- 14. The MicroTymp will turn OFF automatically 40 seconds after the last test or last actuation of any button. Contents of memory are not lost when the unit turns OFF.

  • Page 10: Displaysymbols

    Symbol names are used throughout these instructions to describe the graphic display. ON/READY The MicroTymp is on and ready for service. The test is in progress. When test is complete, this symbol is replaced by ON/READY symbol. Results may now be stored...
  • Page 11 MEMORY #l (Patent’s Right Ear) The contents of Memory #l are being displayed on the screen. MEMORY #2 (Patient’s Left Ear) The contents of Memory #2 are displayed on the screen.
  • Page 12 OVER The admittance measurement (Peak Ya) has exceeded the scale maximum (1.5 mmho). Points which are over the limit are plotted at 0 mmho. BLOCK The test cannot progress because the measured admittance is less than 0.2 mmho. This can be caused by: probe tip lodged against canal wall ear canal occlusion collapsed ear canal...
  • Page 13 BLANK MEMORY The memory location indicated does not contain any data. LEAK The test cannot proceed because desired pressures within the ear have not been achieved. This occurs when: the tip is not completely sealed in the ear canal. the tip becomes dislodged during a test. the ear canal volume is abnormally large 2cc but I 23x;...
  • Page 14 SAVE THE DATA Desired pressures were not reached. This happens when the tip becomes dislodged in the ear canal or if there is a very slight leak throughout the test. Though the test has been interrupted, partial results are displayed. A line at 1.4 mmho has been plotted after the leak condition occurred.
  • Page 15 LOW BATTERY It is necessary to recharge MicroTymp (pg. 22) as battery voltage has fallen below the level required for testing. The START/RUN button is inoperative. The MEMORY (t 9) buttons may be used and data may be printed. PRESSURE RANGE ERROR The air pressure in the ear canal when the test began was not correct.

  • Page 16: Parts

    Parts of the MicroTymp Printer/Charger Paper Feed Button .I Indicator (Green) Power Plug 2 Quick Check Window Quick Check Cavities...
  • Page 17 (pg. 46). The green power indicator will become illuminated. 3. Place MicroTymp in the well with the tip pointing away from the cord. When MicroTymp is properly seated, the red charge indica- tor will become illuminated. Charge indicator may flicker during printing.
  • Page 18 PRINT button again after first printout is complete. 6. Other Messages: No Handle There was either no MicroTymp in the well or it was not seated properly. Reseat the MicroTymp and ensure that red indicator is illuminated. No Data Both memories were empty.

  • Page 19: Quickcheck

    The QUICK CHECK provides a complete functional test of the MicroTymp. The QUICK CHECK should be used at least once per month and whenever there is any question regarding MicroTymp operation. This provides rapid assurance that the MicroTymp is working properly. To use the QUICK CHECK: 1.

  • Page 20: Paperreplacement T

    Paper Replacement Pink strip indicates need for immediate paper replacement. CAUTION: Failure to change paper within 4 printouts after the pink strip appears could result in damage to print mechanism. 1. Remove paper access door by sliding it to the right. Paper Access Door 2.
  • Page 21 5. Slide paper access door to the left until it snaps closed. CAUTION: Ensure paper is taut before closing paper access door. Loose paper can cause printer malfunction. NOTE: Use only Welch Allyn paper (#53600) or Printer/Charger life will be lessened and warrranty voided. DISASSEMBLY OF PRINTER/CHARGER PRESENTS POSSIBLE ELECTRICAL SHOCK HAZARD.

  • Page 22: Wall Mounting Instructions

    Wall Mounting Instructions Choose a location for Printer/Charger within five feet (1.5m) of an electrical outlet. Position mounting bracket vertically on wall and use as template to pencil markings for drill holes. Select correct mounting hardware from two provided: Sheet metal screws and plastic anchors-for concrete block or plasterboard, use 0.187 in.

  • Page 23: Recharging

    Results may be stored, recalled or printed when the battery is low. The MicroTymp may be recharged by any of these three methods: 1. CHARGING TRANSFORMER Any of the Welch Allyn’s charging transformers (pg.
  • Page 24 3. Place MicroTymp into the charging well. MicroTymp will fit into the well only one way. When properly seated the red charge indicator will become illuminated. Power Indicator (Green) A fully drained battery may be recharged overnight by any of the preceding methods (71040 Charging Transformer, 71130 Printer/ Charger or 71123 Charging Stand).

  • Page 25: Battery Replacement

    Battery Replacement The MicroTymp battery is intended for many charge/discharge cycles and is warranted for two years (expiration date is imprinted on battery). REMOVAL OF BATTERY WILL RESULT IN LOSS OF MEMORY CONTENTS. To replace: 1. Allow MicroTymp to turn OFF.
  • Page 26 REPLACE WITH WELCH ALLYN NO. 72700 BATTERY ONLY. RISK OF FIRE MAY OTHERWISE OCCUR. CAUTION: The battery must be removed if the MicroTymp is going to be stored or placed anywhere other than in the Charging Stand (or Charging Transformer) for more than one month.

  • Page 27: Interpretation Of Results

    Interpretation of Results Normal Tympanogram Indicates normally functioning middle ear system Low Static Admittance Low Static Admittance (low peak height) indicates possibility of: Otitis media with effusion Cholesteotoma/other middle ear tumor Tympanosclerosis Otosclerosis NOTE: When peak admittance is below the box, no gradient value will be printed.
  • Page 28 High Static Admittance High Static Admittance (high peak height) indicates possibility Tympanic membrane abnormalities Ossicular disruption NOTE: “HIGH Ya” will print out in place of gradient (GR) value when admittance exceeds 1.5 mmho (see OVER, pg. 11). Volume (+ 200 Vea) Too Large Excessively large volume in presence of flat tympanogram indicates possibility of:...
  • Page 29 Abnormal tympanograms can be grouped into two broad categories: low-admittance pathologies and high-admittance pathologies. Low- admittance pathologies include space-occupying lesions of the middle ear (e.g. otitis media with effusion, middle ear tumors), ossicular fixation (e.g. otosclerosis, lateral ossicular fixation), and conditions that artificially flatten the tympanogram (e.g. ear canal occlusion, tympanic membrane perforation).
  • Page 30 2. Middle ear tumor: There is a wide variety of neoplastic processes that invade the middle ear. The most common is the keratoma (cholesteatoma), a collection of keratinizing squamous epithelium that frequently originates from Shrapnell’s membrane (pars flaccida) of the tympanic membrane or the ear canal wall, and invades the middle ear space.
  • Page 31 A flat tympanogram may occur with a small equivalent volume 2. Tympanic membrane perforation or patent tympanostomy tube: In these cases the air pressure produced by the MicroTymp escapes through the perforation or tube so that a pressure dif- ference across the eardrum does not occur. Because the air pressure changes have no effect on the tension of the eardrum, the tympanogram is flat.
  • Page 32 Note: If volume exceeds 2.0 cc the MicroTymp will not record a tympanogram. Above 2.0 cc a LEAK ( =:) symbol will appear; above 2.5 cc, an OPEN ( ;I ) symbol will appear. HIGH ADMITTANCE PATHOLOGIES Tympanic membrane abnormalities.

  • Page 33: Guidelines For Screening

    Guidelines for Screening (For Hearing Impairment and Middle Ear Disorders) introduction In a non-medical setting, tympanometry can be useful in determining the need for a medical referral. However, abnormal tympanometric results occur not only in patients that have ear disease that requires medical attention, but also in subjects with transient conditions that resolve without medical intervention and in ears that have residual effects of previously-controlled disease.
  • Page 34 Peak (Ya) Too Low When static admittance (Peak Ya) is abnormally low (see normal boxes on MicroTymp) a retest using the entire protocol should be administered after 4-6 weeks. Only upon two consecutive occurrences of low static admittance should a medical referral be recommended, provided that the abnormal result is not accompanied by other abnormalities.
  • Page 35 NOTE: Abnormal tympanometric peak pressure is not recommended as a referral criterion because it is not consistently associated with middle ear disease of medical significance. Guidelines for Screening for Hearing Impairment and Middle Ear Disorders* *Proposed New American Speech Hearing Association (ASHA) Guideline.

  • Page 36: Replacementparts

    Replacement Parts No. 72700 7.2V Nickel Cadmium Battery No. 23630 Set of 4 Tips No. 23621 Small Tip (White) No. 23622 Medium Tip (Black) No. 23623 Large Tip (Gray) No. 23624 Extra Large Tip (Blue) No. 53600 Roll of Paper No.

  • Page 37: Chargingtransformers

    Charging Transformers Any of the following Welch Allyn Charging Transformers may be used with this instrument: No. 71040 110-130~ input UL Listed, CSA Certified No. 71030 90-11Ov Input No. 71032 220-240~ Input Compliant with IEC 601-l No. 71034 230-250~ Input Compliant with IEC 601-l No.

  • Page 38: Cleaning And Sterilization

    A cleaning tool (#236186) has been provided with your Welch Allyn MicroTymp and is attached to this page. Clean the MicroTymp probe once each month or when debris is visible. 1. Remove tip 2. Insert hooked end of cleaning tool and scoop out cerumen and other debris, taking care not to push material into probe.
  • Page 39 Tips Will withstand cleaning or sterilization by any one of the following: Ethylene Oxide (13O”F, 8 PSI. 4 hr. cycle) Cidex 7 70% Isopropyl Alcohol Wescodyne (10% by volume) Boiling water (30 min.) NOTE: Zepharin Chloride (with or without anti-rust tablets) is not recommended.

  • Page 40: Repair And Recalibration

    STATE STREET ROAD SKANEATELES FALLS, NY 13X3-0220 U.S.A. Outside of the United States, return MicroTymp to your local autho- rized Welch Allyn Distributor. Recalibration Annual calibration checks are recommended for the MicroTymp. Arrangements for recalibration may be made by returning the instrument registration card, or by contacting Welch Allyn or an authorized Welch Allyn MicroTymp distributor.

  • Page 41: Glossary

    200 Vea)----the volume of air that has the same acoustic admittance as the ear canal/middle ear system when the ear is pressurized. The MicroTymp measures Vea with a 226-Hz probe tone and an ear canal air pressure of t-200 daPa. Under these conditions, Vea is a good estimate of the volume of air in front of the probe.
  • Page 42 The MicroTymp calculates the gradient by determining the pressure interval corresponding to a 50% reduction in admittance on either side of the peak.

  • Page 43: References

    References Goodhill, V. (1979). Ear: Diseases, Deafness, and Dizziness. Harper and Row (Hagerstown, Md.). Margolis, R.H. (1981). Fundamentals of Acoustic Immittance. In G.R. Popelka (ed.) Hearing Assessment with the Acoustic Reflex. Grune and Stratton (New York). Margolis, R.H.; Heller, J. (1987). Screening tympanometry: criteria for medical referral.

  • Page 44: How The Microtymp Works

    How Welch Allyn MicroTymp Works A block diagram of the Welch Allyn MicroTymp is shown below. A 226-Hz probe tone is introduced in the sealed ear canal by a miniature loudspeaker. A miniature microphone records and monitors the sound pressure produced in the ear canal.

  • Page 45: Technical Specifications

    Technical Specifications 9.60 in 24 c m 5.157 in. 14.1 cm. Printer/Charger 2.9 lb./l.3 Kg.
  • Page 46 Storage Temperature: -20” to + 40°C (-4O to + 104OF). Printer Paper: Thermal type, 58mm (2.28”) wide x 19.8m (65’) long with end-of-roll indicator, Welch Allyn No. 53600. Must be stored in dark, cool location, to prevent exposure of paper. 205 double-ear printouts per roll.
  • Page 47 Printer/Charger Input frequency for all models is 50-60 Hz. All units also include a 105°C automatically resetting thermal protective device in the secondary circuitry. Fuse Types l-3AG Slow Blow 2-5 x 20mm Time Delay Recognition l-UL Approved (UL 544) File No. El5508 2-CSA Certified (C22.2 No.
  • Page 48 Standards Compliance This instrument complies with the following draft standards based on the most recent revision available at the time of design, and classification as a type 4 instrument: American National Standard for Aural Acoustic-lmmittance Instru- ments-83-60, Draft 1984A, 1 l/84. IEC-Aural Impedance/Admittance Instruments Document 29C, Secretariat 46, l/84.
  • Page 49 Welch Allyn gratefully acknowledges the assistance of Robert H. Margolis, Ph.D. of Syracuse University for his assistance in preparing the Introduction, Interpretation of Results, Criteria for Medical Referral, How the MicroTymp Works, and Glossary sections of this booklet.
  • Page 50 Welch Allyn, Inc. 4341 State Street Road P.O. Box 220 Skaneateles Falls, New York 13153-0220 U.S.A. No. 236084-2 Printed in U.S.A.

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