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MA531_EN
EN 10
UTC2
Effects of cavitation
To the passage of the sonic wave in the liquids, depending from phenomenons of compression-decompression, some
small bubble of air can be formed. When a determined volume is reached these bubbles, following the variations of pres-
sure of the field, can gather and can oscillate in a stable beam (stable cavitation), or in a turbulent beam where, because
of ample variations of volume they explode (unstable cavitation).
The cavitation provokes an increase of the flow of the liquids in proximity of the oscillations of the bubbles and it can be
responsible of some therapeutic effects as well as of cellular damages. At therapeutic dose the destructive reactions
would be verified just in presence of low cellular concentration to low viscosity of the mean, as at eyes and uterus level.
Thermal effects
When an ultrasonic wave crosses the biological tissue, part of the mechanical energy is converted into heat. The increase
of the temperature depends on the absorbed energy and is proportional to the intensity of the ultrasonic beam and to the
coefficient of absorption of the tissue. The temperature’s increase changes with relation to the possibility of cooling of the
tissue due to the circulation of the blood or to the movements of the transducer
The generation of a local diathermy in the treatment with ultrasound is not immediate. The appearance of the thermal phe-
nomenon and expecially its perception by the patient they assume for this detail of not immediateness, a great importance
in the respects of the concept “ dose “ during the treatment. This is generally implemented through a circular massage
on delimited areas. Said phenomenon, when the “ dose “ is correct, it will in fact owe, to be revealed as a light pleasant
feeling of heat after some minutes of treatment. The lack or the excessive delay of demonstrations of the phenomenon,
denote an insufficiency of basic dose or wrong removal (on healthy tissue, for instance, rather than sick). The immediate
appearance or the sense of excessive and troublesome heat, it points out the excessive basic dose and the pain in such
case must be interpreted as synonym either of excessive heat, or of a probable diagnostic error in the evaluation of the
state of acuteness of a pathological phenomenon, in the sense that the same is very more acute than the expectation.
Application’s Mode
The therapy with ultrasounds can be applied with two different modalities: by direct contact of the emitter with skin or
through water bath (by immersion).
Application by water bath
This mode is used when the surface to treat are irregular or small or when the zone is so aching to be prevent the direct
contact. The part to treat is dipped in the water at the temperature of about 37°C and the emitter of ultrasound is placed to
a distance of 2 -3 cm. Normally used intensity is 2-3 W/cm2 and the treatment lasts 10-15 minutes. Generally 10 sessions,
one a day, are given to complete a treatment. With Classic model don’t active the contact control in immersion treatment.
Direct contact
In the treatments with direct contact to the skin, a GEL is interposed between the emitter and the skin, in order to better
the energy transmission. The treatments can be implemented in two different ways: with the emitter stationing on the
treatment zone or with the emitter moving on the treatment zone.
Treatment with static emitter
The head of treatment is set on the zone from to treat sustained by a stativo that it maintains the head of treatment to
contact with the skin for the whole duration of the therapy. The absence of movement and the zone of treatment very cir-
cumscribed it provokes rapid increases of temperature, therefore you/he/she is required a small intensity of power (0.5-1
W/cm2) and a pulsated issue (10-20%). The time of treatment is middly of 5-10 minutes with daily frequency for a total
of ten sessions.
Summary of Contents for UTC2
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