Welch Allyn MicroTymp Bedienungsanleitung
\vi!K
Welch
Allyn
MicroTymd
and
Printer/Charger
Operating
Instructions
WA
Welch
Allyn
WiN
Welch Allyn
Thank you for purchasing the Welch Allyn MicroTymp. The
operating and maintenance instructions found in this manual
should be
followed to
ensure many years of accurate and
reliable service. Please read these instructions thoroughly
before using your new MicroTymp.
Contents
Page
No.
Introduction 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
References................................................... 42
How the MicroTymp Works.
.....................................
.43
Technical Specifications
.......................................
.44
MicroTymp-U.S. Patent Number
4,688,582
Introduction to Tympanometry
Aural acoustic immittance
measurements have become an
integral component of audiologic and otologic evaluation. One class
of aural acoustic immittance measurement,
tympanometty,
has
become routine in the assessment of ear disease. Since the original
report of Terkildsen and Thomsen
(1959)
tympanometry has been
used widely by physicians and audiologists as a research tool for
studying the effects of ear disease on middle ear function and as a
clinical test for detecting medically significant pathology. Recent
technological advances provide the capability for the MicroTymp, a
low-cost, portable, precision instrument that can be of significant
value for determining the need for medical referral, for diagnosis of
ear disease, and for monitoring the course of medical/surgical
intervention.
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
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 admittance is high. If the air is difficult
to set into vibration the admittance of the system is low. The ease or
difficulty of setting the air in the ear canal into vibration is determined
by the volume of air and the admittance of the middle ear.
Tympano-
metry
provides a method of evaluating the physical characteristics
of the middle ear by measuring the admittance of the air trapped in
the ear canal.
‘For more in depth information see:
Margolis, 1981; Margolis and Shanks, 1985; Van Camp et al., 1988.
2Mathematically:
Ya =v
P
where Ya is acoustic admittance, v is volume velocity, and p is sound pressure. The unit
of acoustic admittance is the acoustic millimho
(mmho).
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. Positive or negative pressure, introduced
into the sealed ear canal, decreases the admittance of the air in the
ear canal by stiffening the eardrum. The effect of air pressure on
the acoustic admittance measured in the ear canal is systematically
altered by ear disease. Tympanometry is a sensitive indicator of the
effects of ear disease on the acoustical/mechanical function of the
middle ear.
A normal tympanogram is depicted below. Four features of the
tympanogram can be used 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 tympanic membrane perforation, or a
patent tympanostomy tube.
QTympanometric peak pressure (TPP)
is the position of the
tympanometric peak on the pressure axis. TPP is an imprecise
measure of the middle ear pressure. By itself, TPP is not an
accurate indicator of middle ear disease.
OTympanometric
gradient (GR) or tympanometric width
is a
measure of the width of the tympanometric peak. Defined as the
pressure interval required for a 50% reduction of peak eardrum
admittance, tympanometric width is a good indicator of the
presence of
middle ear effusion.
I
0
GR
= 070
da%
4
2
Parts of the
MicroTymp
Tip-
Ejector
Battery Cover
-
-
1
-
1
/
Display
Memory
Buttons
-
Start/Run
Button
-Reference
Label
-Charging
4
Operating Instructions
1. If the instrument has not been stored at room temperature,
allow 45 minutes for instrument to return to operating
temperature range
(1535OC
or
59-95OF).
2. To turn instrument ON, momentarily depress START/RUN
(&D)
button. The OPEN
(
=I
)
symbol will flash 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 leaks. Secure tip to instrument.
Tympanic
Membrane
External Ear
Canal
4.
Grasp the subject’s pinna. Pull gently up and
the ear canal (or straight back for children). back tostraighten
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.
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
appear, reposition probe to start again. For further explanation,
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
8. To store data for later review or printing:
1.
Makesure
unit is ON.
2. Match pattern on button with observed ear.
3. Depress appropriate MEMORY
(t
3)
button.
4. To insure data entry into memory observe memory
symbol on screen.
CAUTION: Holding the MEMORY button down for more than
3 seconds will cause memory to be erased.
9.
To
start
new test, depress 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 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.
8
Display Symbols
The information below may be used as a guide to interpret display
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
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