Lyric2 Sizing Instruction - Phonak Lyric2 Instruction Booklet

Lyric2 sizing instruction

Sizing for Lyric2 is a 2-step process
‚ In the first step, the maximum depth of insertion is determined
using a length sizer.
‚ In the second step, the Lyric2 device sizers are used to determine
h the correct device size.
th
Complete both measurements on one ear before continuing with
the other ear. After successful sizing, Lyric2 can be immediately fit.
Step 1 Determine device insertion depth
‚ Inform the patient what you are doing and show that the tip of
the length sizer is very soft (e.g. touch back of hands with it).
‚ Instruct patient to tell you when TM is touched (usually indicated
by scratching noise or tickling sensation).
‚ Locate the posterior meatus. This will be your reference point for
the sizing process. Hold length sizer between your index and
middle finger and insert it into the ear canal by gently tapping
with your thumb, taking care to keep the tip at the bottom of
the canal.
‚ To ensure the sizer is laying on the bottom of the ear canal, it
helps to use the inter-tragal notch as the entry point.
‚ Lift index finger and gently tap the length sizer into the canal
with your thumb. The length sizer is balanced on your middle
finger and the floor of the ear canal.
‚ Insert length sizer until the soft tip touches the tympanic
membrane, at which point you will feel or see the length sizer
bend or bounce back against your thumb.
‚ Always release pinna before reading maximum device insertion
depth at posterior meatus.
‚ Refer to color band markings to determine maximum device
insertion depth (see diagram above: length sizer diagram).
‚ Repeat the measurement 2 times to avoid false measurements
(e.g. because length sizer hits the wall, etc.).
Step 2 Determine device size
‚ Repeat otoscopy prior to sizer insertion.
‚ Start sizing with the small sizer (green core). Load the sizer on
the insertion tool and make sure that the black dot on the seal is
in the superior position.
‚ Prior to insertion, gently apply lubricant (see lubrication
instruction on page 16).
‚ Use the depth collar to set the maximum depth of insertion on
the insertion tool according to the previous measurement.
‚ Insert sizer according to the shape of the canal as observed
during otoscopy. If pulled, release pinna before reading insertion
depth at posterior meatus.
‚ Pay attention to the resistance felt during sizer insertion as it is
the first indication for acoustic seal and Lyric2 size. Little
resistance = poor acoustic seal so consider larger size.
Appropriate resistance = good acoustic seal and appropriate size.
Significant resistance = reasonable acoustic seal unless folding
but consider smaller size.
‚ Check the fit of the sizer with otoscopy technique. If all sides
of the seal are touching the ear canal wall without any gaps or
folds in the seal and if the insertion was smooth and
comfortable, the patient wears a small device.
‚ Folds in seal indicate that sizer is too big and you should try
the XS-sizer.
‚ If the XS-sizer is still too big, the ear is contraindicated for Lyric2
use. If the ear canal is too large, you will see gaps between the
canal wall and sizer indicating that you should try a larger sizer.
‚ The device size is correct when there are no gaps or folds and it
fits comfortably in the ear canal.
If you are unsure which size to choose (e.g. two sizes show good
fit in the ear), it might also help to consider the hearing loss
when selecting device size (stronger HL requires better seal and
vice versa).
If desired, let the patient remove the sizer using the SoundLync
to practice the removal.
If a custom swim mould is required, take impression with the
correct sizer placed in the ear canal used as impression pad.
17