Welch Allyn MicroTymp Скачать руководство пользователя страница 35 | Manualshive

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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*

1

r

*Proposed New American Speech Hearing Association

Guideline.

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Содержание MicroTymp

Страница 1: ... vi K Welch Allyn MicroTymd and Printer Charger Operating Instructions WA Welch Allyn ...

Страница 2: ...roduction to Tympanometry 1 MicroTymp Parts 4 Operation 5 DisplaySymbols 9 Printer Charger Parts 15 Operation I 6 QuickCheck 18 PaperReplacementt 19 Wall Mounting Instructions 2 1 MicroTymp Recharging 22 Battery Replacement 24 Interpretation of Results 26 Guidelines for Screening 32 ReplacementParts 3 5 ChargingTransformers 36 Cleaning and Sterilization 37 Repair and Recalibration 39 Glossary 4 0 ...

Страница 3: ...nent 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 principles of tympanometry Acoustic admittance is the ease with which acoustic energy is transferred from one system to another If the air in the ear canal is easily set into vibration the a...

Страница 4: ... to evaluate the ear under test Static admittance Peak Ya is a measure of the height of the tympanometric peak Given appropriate norms static admittance is a useful indicator of middle ear disease Equivalent ear canal volume 200 Vea is the admittance value determined with an ear canal air pressure of 200 daPa dekapascals An abnormally high equivalent ear canal volume suggests the presence of a tym...

Страница 5: ...Parts of the MicroTymp T i p Ejector Battery Cover 1 1 Display Memory Buttons Start Run Button R e f e r e n c e Label C h a r g i n g 4 ...

Страница 6: ...h repeatedly in the center of the screen The RUN s 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 Tips are not intended to be inserted within the ear canal Improper tip size will cause le...

Страница 7: ...ening The tip should point straight into the ear canal for adults and slightly anteriorly for children Inadequate pressure or misalignment will cause LEAK g or BLOCK z errors which prevent the seal necessary to complete a test 6 Upon achieving a seal an indication on the 200 Vea scale will appear Points will then progress from right to left across the display If BLOCK zl LEAK or OPEN I symbols 6 ...

Страница 8: ...xplanation and in case of other symbols see Display Symbols pg 9 for interpretation I 6 0 2w 200 100 I 1w M a 1 5 4 I 1 0 1 1 5 0 7 Test is complete when RUN s symbol disappears and ON READY I symbol reappears Typical test takes approximately 3 seconds 7 ...

Страница 9: ... START RUN 6 D button 10 Tips may be removed by hand or by sliding the toward the tio white tip ejector 1 I To print results use Printer Charger 71130 pg 16 12 To display right F or left 3 memory contents press appropriate memory button 13 To erase right F or left 3 memory contents depress appropriate memory button continuously for 3 seconds BLANK MEMORY symbol will appear 14 The MicroTymp will tu...

Страница 10: ...lay symbols Symbol names are used throughout these instructions to describe the graphic display ON READY The MicroTymp is on and ready for service RUN The test is in progress When test is complete this symbol is replaced by ON READY s symbol Results may now be stored if desired 9 ...

Страница 11: ...MEMORY l Patent s Right Ear The contents of Memory l are being displayed on the screen I__ 4 2 1 0 I MEMORY 2 Patient s Left Ear The contents of Memory 2 are displayed on the screen IO ...

Страница 12: ...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 l probe tip lodged against canal wall l ear canal occlusion l collapsed ear canal l extremely small ear Repositioning probe tip will usually alleviate this condition 11 ...

Страница 13: ...etely sealed in the ear canal l the tip becomes dislodged during a test l the ear canal volume is abnormally large 2cc but I 23x above 2 5 the OPEN I symbol will appear To alleviate this condition l reposition the tip l use a different tip l increase pressure against the ear NOTE If a leak condition occurs after 100 daPa pressure is reached the pattern will be displayed with a Save the Data Symbol...

Страница 14: ...esent the test need not be repeated If no peak can be identified follow instructions for LEAK i condition OPEN The test has not begun because the total measured admittance the sum of 200 Vea and Ya exceeds 3 5 mmho This occurs when l the unit is not in an ear l the probe is not completely sealed in an ear l used on perforated or hypermobile tympanic membrane an ear with patent tympanostomy tubes o...

Страница 15: ... 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 The MicroTymp sensed this error To alleviate this condition restart MicroTymp Should this symbol persist return instrument for servicing pg 39 NOTE Gradient values are computed by the Printer Charger and will appear at time of printout 14 ...

Страница 16: ...Parts of the MicroTymp Printer Charger Paper Feed Button I 7 Print Button Indicator Green Power Plug 2 Doit Quick Check Window Quick Check Cavities 15 ...

Страница 17: ... flat vertical surface pg 21 2 Connect the power plug to receptacle of proper voltage frequency and plug type 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 I Ch3 ye Indicator I r Print Butto...

Страница 18: ...inted results are an exact copy of information on the MicroTymp display that was stored in memory If only one memory had data then only one result will be printed For a duplicate copy of results depress PRINT q 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 ind...

Страница 19: ...esults 2 Print results for that tracing only other memory should be empty 3 Insert results in QUICK CHECK window 4 Align baseline and 200 Vea axis of the printout with window 5 The printed value of 200 Vea should fall within the 0 5 box on the window If the printout is outside the box return MicroTymp for recalibration Check Window 6 Repeat steps 1 5 using the 1 9cc QUICK CHECK cavity and box NOTE...

Страница 20: ...ip appears could result in damage to print mechanism 1 Remove paper access door by sliding it to the right Paper Access Door 2 Remove and discard old roll of paper but save black plastic spindle 3 Cut end of new roll squarely and insert black plastic spindle Torn edge will prevent paper from feeding properly and could cause paper jam Discard End ...

Страница 21: ...Front View Side View indicating possible loose areas 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 REFER ALL ...

Страница 22: ...rect mounting hardware from two provided Sheet metal screws and plastic anchors for concrete block or plasterboard use 0 187 in 4 75mm diameter drill Secure anchors to wall Sheet metal screws only for metal panel or wood walls use 0 120 in 3 05mm diameter drill Fasten mounting bracket to wall with screws Mount unit by aligning Printer Charger cut out with top of bracket Push down until seated secu...

Страница 23: ...HARGING TRANSFORMER Any of the Welch Allyn s charging transformers pg 36 may be used To recharge 1 Plug the transformer into a receptacle of appropriate voltage frequency and plug configuration 2 Place MicroTvmp on its side and plug the output cord of the transformer into the charging jack 71040 Charging Transformer shown 2 MODEL 71123 AUDIOSCOPE CHARGING STAND Follow directions included with stan...

Страница 24: ...vernight by any of the preceding methods 71040 Charging Transformer 71130 Printer Charger or 71123 Charging Stand The MicroTymp may be charged indefinitely without damage to the battery Special Notes l Slight heating of MicroTymp handle is normal l Batteries will not leak l Batteries will discharge gradually over a period of about 60 days when stored at room temperature 7O F Storage at higher temp...

Страница 25: ...ration date is imprinted on battery REMOVAL OF BATTERY WILL RESULT IN LOSS OF MEMORY CONTENTS To replace 1 Allow MicroTymp to turn OFF 2 Unscrew battery cover using a small Phillips head screwdriver Save this screw 3 Remove battery cover by lifting up and away from the tip end of MicroTymp 4 Grasp and pull up on battery 24 ...

Страница 26: ...and lower battery into compartment 6 To replace cover first insert tip end under front cover then lower opposite end and replace screw To avoid stripping screw threads do not tighten excessively 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 Stan...

Страница 27: ... height indicates possibility of l Otitis media with effusion l Cholesteotoma other middle ear tumor l Tympanosclerosis l Otosclerosis NOTE When peak admittance is below the box no gradient value will be printed Gradient Too Wide Gradient Too Wide GR 151 daPa in children or 114 daPa in adults indicates possibility of l Otitis media with effusion 26 ...

Страница 28: ...nce exceeds 1 5 mmho see OVER pg 11 Volume 200 Vea Too Large Excessively large volume in presence of flat tympanogram indicates possibility of l Perforated tympanic membrane l Patent tympanostomy tube NOTE If volume exceeds 2cc a LEAK F symbol will appear above 2 5cc an OPEN I symbol will appear Negative Tympanometric Peak Pressure Negative TPP indicates eustachian tube dysfunction as a result of ...

Страница 29: ...ons produce low static admittance of the middle ear by a variety of mechanisms A lesion that displaces air in the middle ear space will cause low admittance by reducing the middle ear volume The lesion may also interfere with the vibration of the ossi cular chain contributing to the low admittance Finally if the lesion is in contact with the eardrum low admittance will result from inter ference wi...

Страница 30: ...ic otitis media that may involve the eardrum malleus incus and or stapes or from otosclerosis a genetic condition of delayed onset that produces a focal lesion immobilizing the stapes footplate In general the more lateral the fixation the more effect the condition has on the tympanogram 1 Lateral ossicular fixation Tympanograms recorded from patients with lateral ossicular fixation are typically c...

Страница 31: ...lume in front of the probe is less than 0 2 cc l A flat tympanogram may occur with a small equivalent volume 4cc for children or 6cc for adults 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 ...

Страница 32: ...into vibration with greater ease than the normally stiff tympanic membrane The result is a high static admittance Although the tympanogram is abnormal the condition rarely affects hearing sensitivity or requires further medical treatment Ossicular disruption Disruption of the ossicular chain ranges from partial interruption with fibrous attachments between ossicular remnants to complete absence of...

Страница 33: ...ry Because abnormal tympanograms occur in transient middle ear conditions that do not require medical attention the occurrence of tympanometric abnormalities must be interpreted with caution Some tympanometric abnormalities are cause for an immediate medical referral while others warrant a referral only if they persist over an extended period of time Recent Ear Pain Discharge Ideally the decision ...

Страница 34: ...n could be conducted 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 NOTE When the peak is too high...

Страница 35: ...riterion because it is not consistently associated with middle ear disease of medical significance Guidelines for Screening for Hearing Impairment and Middle Ear Disorders 1 4 rW w Pass w 0 Pass w 11 NO WiFi ER Proposed New American Speech Hearing Association ASHA Guideline 34 ...

Страница 36: ...3621 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 236186 Cleaning Tool No 711524 Spindle for Paper No 236081 Screw for Battery Cover No 71123 AudioScope Charging Stand Also charges MicroTymp does not have printer ...

Страница 37: ...with this instrument I I cl 0 I I cl 0 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 71036 230 250 Input SAA Approved All transformers operate at either 50 or 60 Hz 36 ...

Страница 38: ...ctioning of the instrument Cleaning Tool 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 Printer Charger Do not sterilize May be cleaned by wipin...

Страница 39: ...ine 10 by volume Wescodyne 10 by volume Boiling water 30 min NOTE Zepharin Chloride with or without anti rust tablets is not recommended The use of Betadine Wescodyne or boiling water may discolor tips however performance is not affected CAUTION If the tips are wiped while attached to the instru ment the probe tip should be pointed down to prevent seepage of liquid into probe tip 38 ...

Страница 40: ...libration 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 The MicroTymp warranty may be extended for up to three years provided the in strument is returned each year for recalibration A monthly functional check using the Quick Check is al...

Страница 41: ...imate of the volume of air in front of the probe Vea is abnormally large in some patients with ear drum perforations and patent tympano stomy tubes keratoma a collection of keratinizing squamous epithelium that invades the middle ear it frequently originates from a perforation in Shrapnell s membrane pars flaccida of the tympanic mem brane also called cholesteatoma lateral ossicular fixation fixat...

Страница 42: ... the tympano gram in the region of the tympanometric peak The MicroTymp calculates the gradient by determining the pressure interval corresponding to a 50 reduction in admittance on either side of the peak Also called the tympanometric width tympanometric peak pressure the value of ear canal air pressure at which the tympanometric peak occurs tympanometric width see tympanometric gradient tympanom...

Страница 43: ...metry criteria for medical referral Audiology in press Margolis R H Shanks J E 1985 Tympanometry in J Katz ed Handbook of Clinical Audiology 3rd ed Williams and Wilkins Baltimore Terkildsen K Thomsen K A 1959 The influence of pressure variations on the impedance of the human eardrum J Laryngol Otol 73 409 418 Van Camp K J Margolis R H Wilson R H Creten W Shanks J E 1988 Principles of Tympanometry ...

Страница 44: ...e speaker must be driven harder by increasing voltage to maintain the correct SPL The voltage required to maintain the probe tone at 85 dB SPL is proportional to the acoustic admittance of the ear As pressure in the ear canal is changed throughout a test the microprocessor computes acoustic admittance and plots it out Pressure in the ear canal is changed with a miniature pump The pressure transduc...

Страница 45: ...Technical Specifications I 5 157 in 14 1 cm L I 9 60 in 24 c m MicroTymp 0 64 lb O 29 Kg Printer Charger 2 9 lb l 3 Kg 44 ...

Страница 46: ... color coded sizes Probe Tone Frequency 226 Hz 3 Amplitude 85 f 3 dB re 20 uPa in an ANSI HA 1 2cc coupler Distortion 5 maximum total harmonic distortion in an ANSI HA 1 2cc coupler Pump Direction of sweep positive to negative pressure Speed 200 rt 20 daPa second average during data acquisition period Pressure Measurement System Range 200 to 300 daPa Display resolution 20 daPa Accuracy f 15 or 10 ...

Страница 47: ...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 125 File No LR16391 3 Compliant with IEC 601 l 4 Compliant with VDE 0871 B File No T 4 lb B 3532 HfrG Allg Gen 24 02 1988 Plug Types 0 0 II 0 II 1 A B C D 46 ...

Страница 48: ... Acoustic lmmittance Instru ments 83 60 Draft 1984A 1 l 84 IEC Aural Impedance Admittance Instruments Document 29C Secretariat 46 l 84 Warning NOT FOR USE IN THE PRESENCE OF FLAMMABLE ANESTHETICS POSSIBLE EXPLOSION HAZARD DISASSEMBLY OF PRINTER CHARGER PRESENTS POSSIBLE ELECTRICAL SHOCK HAZARD REFER ALL SERVICING TO QUALIFIED PERSONNEL TO PREVENT POSSIBLE FIRE HAZARD REPLACE BATTERY AND FUSES WITH...

Страница 49: ...ges 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 ...

Страница 50: ...Welch Allyn Inc 4341 State Street Road P O Box 220 Skaneateles Falls New York 13153 0220 U S A Printed in U S A No 236084 2 ...

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