USER MANUAL
– STROBOLED
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INMANUUIN171 Rev.2019.04.01 / ENG
3.2 INTENDED USER
The StroboLED has been designed to be used by medical, paramedical or health professionals.
3.3 DESCRIPTION & FUNCTIONING
StroboLED has a LED lighting module which produces the necessary light to obtain video images.
The cold, deep and white Xenon light of this equipment enhances the real brightness and colors
allowing its use for all types of stroboscopic and endoscopic procedures.
The StroboLED allows the connection with an universal endo-camera Ecleris Procam, which has
a
1/3” CCD sensor with integrated controls. The sensor has been especially designed for medical
applications. The endo-camera allows the electronic capture of the image, its processing and
converting to a video signal with proper features to be connected to external devices as monitor,
videoprinters, image capture systems, and others.
Stroboscopy makes it possible to study laryngeal physiology and pathophysiology, as well as to
perform a comprehensive diagnosis of its changes. To understand the principles of how a
stroboscope works it is essential to be familiar with the phonation process.
Phonation is the physical act of producing sound by the passive interaction of the vocal folds and
exhaled air it is modified in terms of tone, pitch and intensity by thoracic, abdominal and laryngeal
muscles, and by the cavities in the upper respiratory tract.
At the beginning of the vibration cycle, the vocal folds are closed at the middle line; when the
subglottal pressure exceeds, by volitive effect, the resistance created by the closure of the vocal
folds, the inferior border begins to open and this aperture generates an undulating movement of
the folds from the inferior to the superior border with a resultant aperture and closure sequence.
Expiratory muscle contraction results in an increase of subglottal pressure and passing of air
between the vocal folds that come together to the middle line, thus preventing air stream to pass
through and the cycle begins once again. Stroboscopic effect is based on the optical illusion that
creates a fictitious slowing down of a periodical movement, which makes it possible to display fold
vibration.
Stroboscopic light sends rapid pulses, each of them flashing a particular point in the vibration
cycle. Whenever the frequency is changed regarding fold vibration (asynchronic), an optical
illusion of movement occurs; whenever both frequencies overlap (synchronic), a frozen or still
movement effect occurs. When the emission of flash and the phonation frequency are synchronic,
the same part of the fold vibration cycle will be flashed, therefore vocal cords will be seen
motionless or in slow motion due to phase variation.
However, when the emission of flashes is asynchronic, a different stage of the vibration cycle will
be lit up with each flash impulse.
Laryngostroboscopy goals:
Vocal folds observation
Prognosis assessment
Results monitoring
For a proper use of StroboLED it is essential to know the basic functioning of the equipment.
3.3.1. PARAMETERS TO BE ASSESSED BY STROBOSCOPY
It is essential to know the parameters that have to be evaluated by stroboscopy. The different
parameters are briefly discussed below.
