Application
182099015-V01-10.Juni2013-GA-MCL31-THAI 41
Clinical experience has shown that optimal ablation of tissue can be achieved by applying energy
densities at average levels (about 4 to 10 J/cm²).
For initial application sessions, we recommend using an energy density of 4 J/cm².
As a general rule, energy density settings between 4 J/cm² and 10 J/cm² are adequate for most
indications.
Please note that ablation will not begin unless a certain level of energy density (ablation
threshold) is exceeded. This threshold is quoted as 1.6 J/cm² (approximate value) by litera-
ture sources. A density setting smaller than 1.6 J/cm² will cause heating of tissue and potential
thermal damage. Energy densities at such levels can also be selectively used in order to achieve
superficial hemostasis.
To support such applications, the Dermablate allows you to activate a thermal mode, in which
subablative pulses (energy density = 1,5 J/cm²) will be emitted at a high repeat frequency (F = 20
Hz). Such energy densities are not enough to ablate tissue, because the applied energy remains
inside the tissue as thermal energy.
Spot size:
The spot size is determined by the particular indication in the first place. Small diameters are typi-
cally selected for ablation of a minor lesion or planarization of the rim of a lesion. . For treatment
of an area-related indication, a medium to large spot diameter is used in many cases.
On selecting one of the largest available spot diameters, you should make sure that your energy
density (energy per spot area) is actually strong enough to trigger the therapeutic effect (refer to
section “Energy density”).
Frequency:
• For therapeutic treatment of an extended lesion, the frequency, i.e. the repetition rate of laser
pulses, can be randomly selected as appropriate for a given application and suggested by
personal experience. For example, 8 Hz appears to be a suitable rate for a handpiece that is
manually moved over greater surface areas by an experienced user.
• To remove a small lesion, you may set a frequency of 1 Hz (example), in order to prevent
overtreatment.
• On selection of Thermal Mode, the laser frequency will be fixed at 20 Hz. This results in rapid
heating of tissue due to the subablative pulses that are applied in this case.
To Next Page
Loading...