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Interacoustics AT235 Additional Information

Interacoustics AT235 Additional Information

Impedance audiometer
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Additional Information

AT235
Impedance Audiometer
D-0105061-D – 2017/05

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Summary of Contents for Interacoustics AT235

  • Page 1: Additional Information

    Additional Information AT235 Impedance Audiometer D-0105061-D – 2017/05...

  • Page 3: Table Of Contents

    1.2.2 Visual inspection of the ear canal ................1 1.2.1 Placement of the contralateral phones ..............2 General Operation of the AT235 Tympano-metry Module .............. 3 Tympanometry ........................3 Reflex ..........................5 Reflex Decay ........................7 Reflex Latency ........................8 Eustachian Tube Function –...

  • Page 5: At235 Tympanometry Module

    The target population for the AT235, including Tympanometry Module includes all ages. The AT235 including Tympanometry Module is designed to be used only by skilled personnel such as audiologists, ENT surgeons, doctors, hearing healthcare professionals or personnel with a similar level of training and expertise.

  • Page 6: Placement Of The Contralateral Phones

    AT235 Additional Information Page 2 1.2.1 Placement of the contralateral phones If the contra headphone is used, place the headband over the patient's head. The audiometric headphone is placed over the non-test ear (or contralateral reflex ear). If the insert phone is used, mount the proper foam tip on the end of the tubing before inserting into the non-...

  • Page 7: General Operation Of The At235 Tympano-Metry Module

    AT235 Additional Information Page 3 2 General Operation of the AT235 Tympano- metry Module 2.1 Tympanometry The default display of tympanometry tests shows graphs for both left and right ear. The following information is found in the display: The label above the graphs indicates which probe tone frequency was used while measuring the recording that is plotted.
  • Page 8 AT235 Additional Information Page 4 Manual Tympanometry Testing The dot represents the measurement of the (non-compensated) acoustic admittance. It is only shown when not recording. During recording the display will always be non-compensated. The empty triangle indicates actual pressure. The full triangle is the pressure cursor showing the current target pressure. It is moved by turning the...

  • Page 9: Reflex

    AT235 Additional Information Page 5 2.2 Reflex Note that in case your protocol has no reflex test included, you can temporarily include a reflex test in your protocol by pressing the I Reflex C button. The default displays of reflex tests show a matrix of reflexes, which are measured in the order of appearance on the screen.
  • Page 10 AT235 Additional Information Page 6 In the second setup, the probe is placed in the left ear with the contra headphone placed on the right ear.

  • Page 11: Reflex Decay

    AT235 Additional Information Page 7 2.3 Reflex Decay Note that in case your protocol has no reflex decay test included, you can temporarily include a reflex decay test in your protocol by holding the Shift button while pressing the I Reflex C button. Pressing this combination also allows including and excluding a reflex decay test from running automatically.

  • Page 12: Reflex Latency

    AT235 Additional Information Page 8 2.4 Reflex Latency The reflex latency test will be automatically performed with an activator intensity of 10dB above the reflex threshold. The test will show a pop up and ask for the intensity of the activator in case: •...

  • Page 13: Eustachian Tube Function - Non-Perforated Eardrum

    AT235 Additional Information Page 9 2.5 Eustachian Tube Function – Non-perforated Eardrum The display of the Eustachian tube function test for the non-perforated eardrum shows graphs for the selected ear in which the three tympanograms of the adapted Williams procedure are plotted. The Williams procedure keeps the pressure between the first and second tympanogram at stop pressure, and between the second and third tympanogram at the start pressure.
  • Page 14 AT235 Additional Information Page 10 The non-compensated tympanometric curves. The equivalent ear canal volume where the acoustic admittance (Y) at the starting pressure of the first tympanogram is taken as the reference value. The table shows the pressure values at which the three peaks are detected (or the highest equivalent volume if there is no peak).

  • Page 15: Eustachian Tube Function - Perforated Eardrum

    AT235 Additional Information Page 11 2.6 Eustachian Tube Function – Perforated Eardrum The default display of the Eustachian tube function test for a perforated eardrum shows a graph for the selected ear. The following information is available during testing: The pressure curve showing that the pressure drops each time the patient swallows. Notice that an exponential release of pressure means that the probe sealing might not be sufficient.

  • Page 16: Eustachian Tube Function - Patulous Eustachian Tube

    AT235 Additional Information Page 12 2.7 Eustachian Tube Function – Patulous Eustachian Tube The Patulous Eustachian Tube test is an impedance baseline test. It monitors changes in impedance over time without applying pressure changes or acoustic stimuli. When a patulous Eustachian tube is present you would typically expect to identify the breathing of the patient in the tympanometric curve.

  • Page 17: The Setup Menu

    AT235 Additional Information Page 13 3 The Setup Menu When holding the Setup button, a menu pops up from which you can select one of the options by rotating the wheel and releasing the Setup button. By default, Protocol settings is selected in which you can temporarily or permanently change the settings used during testing.

  • Page 18: Protocol Settings

    AT235 Additional Information Page 14 3.2 Protocol Settings Press the Setup button to enter protocol settings. Note that the protocol settings of a test can only be changed while there is no data stored for that test. In instances where data is present at the top of the screen, it will say “Data is present, press ‘New session’ to allow changing settings.

  • Page 19: Tymp Settings

    AT235 Additional Information Page 15 3.2.1 Tymp settings Select a tymp test in your Protocol settings. By rotating the wheel, the following settings can be selected and changed. Auto run. Once enabled for a test auto run will cause this test to be automatically run as part of the protocol.
  • Page 20 AT235 Additional Information Page 16 • Medium, which results in a constant speed of about 200 daPa/s • Slow, which results in a constant speed of about 100 daPa/s • Very slow, which results in a constant speed of about 50 daPa/s Manual mode minimum pressure allows you to set the lower limit of the pressure range during manual tympanometry.

  • Page 21: Reflex Settings

    Start level up to Stop level, also if the threshold criterion is attained before reaching Stop level. When Auto stop is chosen, AT235 will detect the reflex threshold according to the threshold criterion and confirm the reflex at the same intensity.
  • Page 22 AT235 Additional Information Page 18 Probe tone frequency. The frequencies which can be selected are 226Hz (recommended for normal testing), 678Hz, 800Hz and 1000Hz. The Peak pressure offset defines how far from the peak pressure the reflex is measured. When multiple peaks are found, the measurement will be taken from the highest peak.
  • Page 23 AT235 Additional Information Page 19 To select a reflex sequence from the table, hold the button while rotating the wheel for selecting the wanted start level. For ipsilateral measurements at some frequencies, the maximum output is limited compared to contralateral measurements.

  • Page 24: Reflex Decay

    Test duration will set the length of the probe tone to 10, 15, 20, 25 or 30 seconds. Show warning gives you the opportunity to set a level at which the AT235 will give a warning. Measure decay at ambient pressure allows you to measure reflex decay while the tympanic peak pressure is being ignored.
  • Page 25 AT235 Additional Information Page 21 When the AGC (automatic gain control) checkbox is marked, the size of the ear canal is taken into account for adjusting the stimulus level. Without compensation, the intensity level will increase as the size of the ear canal decreases. Note that current tympanometry standards do not yet describe how AGC should be applied.

  • Page 26: Reflex Latency

    Auto run. Once enabled for a test auto run will cause this test to be automatically run as part of the protocol. Show warning gives you the opportunity to set a level at which the AT235 gives a warning. Measure latency at ambient pressure allows you to measure reflex latencies while the tympanic peak pressure is being ignored.
  • Page 27 AT235 Additional Information Page 23 When the AGC (automatic gain control) checkbox is marked, the size of the ear canal is taken into account for adjusting the stimulus level. Without compensation, the intensity level will increase as the size of the ear canal decreases. Note that current tympanometry standards do not yet describe how AGC should be applied.

  • Page 28: Eustachian Tube Function - Non-Perforated Eardrum

    Connect a pc keyboard to the USB port of the AT235 for easy typing options including the use of special characters.
  • Page 29 AT235 Additional Information Page 25 Stop pressure. The stop pressure for the three automated tympanograms is selected here. The stop pressure can vary between +300 and -600 daPa. The Non-Perforated Eardrum test is performed. Pump speed. The pump speed for automated tympanometry is selected here. The stated pump speeds are dependent on the size of the ear canal or cavity that is being used during the measurement.

  • Page 30: Eustachian Tube Function - Perforated Eardrum

    Connect a pc keyboard to the USB port of the AT235 for easy typing options including the use of special characters. Start pressure. Here the start pressure is set and can vary between +400 and -600daPa.

  • Page 31: Eustachian Tube Function - Patulous Eustachian Tube

    With the precision of the AT235, it is not uncommon to measure a patient’s heart beat. When rotating the wheel, the following settings can be selected and changed.

  • Page 32: Pause

    Connect a pc keyboard to the USB port of the AT235 for easy typing options including the use of special characters.

  • Page 33: Manage Protocol Settings

    AT235 Additional Information Page 29 3.7 Manage Protocol Settings Hold the Setup button until, by rotating the wheel, Manage protocols is selected. A window pops up showing currently available protocols on your instrument. By default, all custom made protocols are displayed at the top of the list and all factory default protocols are displayed at the bottom of the list.

  • Page 34: Instrument Settings

    AT235 Additional Information Page 30 3.8 Instrument Settings Hold the Setup button while rotating the wheel until Instrument Settings is selected. By rotating the wheel, the following settings can be selected and changed. AUD key. When pressing the button, a pop up window opens in which you can enter a new license key for the audiometry module.
  • Page 35 If the AT235 is connected to the Diagnostic Suite, your PC will automatically update the date and time. Under Printer type you can select which printer is connected to the USB port of your AT235. By default, the Sanibel MPT-III thermal printer is selected. The list below shows the currently supported printers.
  • Page 36 AT235 Additional Information Page 32...

  • Page 37: At235 Audiometry Module

    The target population for the AT235 including Audiometry Module covers all ages. The AT235 including Audiometry Module is designed to be used only by skilled personnel such as audiologists, ENT surgeons, doctors, hearing healthcare professionals or personnel with a similar level of training and expertise.
  • Page 38 AT235 Additional Information Page 34...

  • Page 39: General Operation Of The At235 Tympano-Metry Module

    AT235 Additional Information Page 35 5 General Operation of the AT235 Tympano- metry Module 5.1 Tone Test The Tone test screen is used for pure tone audiometry via normal headphones or insert phones and its functionality is described in the Instructions for Use.

  • Page 40: Auto Test: Hughson-Westlake

    AT235 Additional Information Page 36 5.2 Auto Test: Hughson-Westlake Hughson Westlake is an automatic pure tone test procedure. The threshold of hearing is defined as 2 out of 3 (or 3 out of 5) correct responses at threshold level in a 5dB increase and a 10dB decrease test procedure.

  • Page 41: The Setup Menu

    AT235 Additional Information Page 37 6 The Setup Menu When holding the Setup button, a menu pops up in which you can select one of the options by rotating the wheel and releasing the Setup button. Tone settings, Auto settings, and Common settings - AUD are available from here.

  • Page 42: Tone Settings

    AT235 Additional Information Page 38 6.2 Tone Settings Hold the Setup button and rotate the wheel in order to select Tone Settings. When rotating the wheel, the following settings can be selected and changed. In order to use dedicated symbols for aided and binaural measurements, be sure to select the correct Measurement type here.

  • Page 43: Auto Settings

    AT235 Additional Information Page 39 Select Jump to 1kHz by output change if you wish to default to 1000Hz when changing ear side. At Jump Strategy you define how the system automatically changes frequency when storing thresholds. Bottom makes you rotate through frequencies from bottom up. Butterfly makes you start at 1000Hz, move up to the highest frequency, jump back to 1000Hz and move down to the lowest frequency.
  • Page 44 AT235 Additional Information Page 40...

  • Page 45: Quick Guides

    AT235 Additional Information Page 41 7 Quick Guides 7.1 Selecting the Correct Ear Tip The clinician can choose from a range of ear tips. In general, flanged or mushroom shaped ear tips will be used for most testing (Impedance, DPOAE, TEOAE and Automated ABR). Sometimes, an umbrella shaped ear tip will be more appropriate for performing a quick impedance screening.

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