USERMANUAL 10
Packcontents
TheRESTARTpackcontains:
•1RESTARTdevice;
•1medicalpower supply;
•1batterycharger;
•1gelfor ultrasound;
•1carry bag;
•1usermanual.
Introduction tothetechnology
Ultrasoundtreatmentrepresentsamethodthatisbasedonthetransferofenergyintothetissues
whichresultsinthermal and non-thermal biological effects.
This treatment is based on the contact between the head of the device and the tissues being
treated.Theoptimalcouplingof these twosurfacesisensured bytheuseofawater-basedultra-
sound gel. Through the contact described the transmission of general mechanical waves from
the piezoelectric present inside the head of the device takes place. In order for there to be maxi-
mumtransmissionofenergyfromonemediumtoanother,theimpedanceofthetwomustbethe
same.Obviouslyinthecaseofthehumanbody, suchconditionhardlyoccurs.
Thegreatertheimpedancedifferencebetweenthetwomedia,thegreaterthereflectionandcon-
sequently the smaller the amountofenergy that will betransferred.Theimpedancedifferenceis
greatestwithaluminium-airinterface,whichisthefirstthatultrasoundwaveswouldhavetoover-
cometoreachthebody.Toreducethisdifference,acouplingsubstancemustbeused.Ifthereisa
smallamountofairbetweenthetransducerandtheskin,theproportionofultrasoundwavesthat
wouldbereflectedwouldreach99.998%,i.e.therewouldbe no transmission.
In addition to the phenomenon of reflection, if the wave does not hit the separation surface
between the media at 90°, refraction occurs. In practice, the direction of the ultrasound beam
through the second medium will be angled. The critical angle for ultrasound waves at the skin
surface appears to be 15°.If the device head is oriented at a 15° angle to the surface, most of the
beam will propagate through the epidermal tissues parallel to the skin rather than perpendicular
tothetissues.
The absorption of the energy released by the ultrasound waves follows an exponential trend, in
fact muchmoreenergyisabsorbedinsuperficialtissuesratherthanindeepones.
Precisely due to the trend of absorption, theoretically there is no point where all the energy is absor-
bed,butthereiscertainlyapointwheretheselevelsarenotsufficienttoproduceatherapeuticeffect.
Generally tissues with the highest protein content will absorb more, unlike tissues with high water
andlowproteincontent,whichwillabsorbaminimalamountofenergy(bloodandfat,forexample).
