Flash pulsed dye laser pump
2015/12/15 view:
Flash
pump pulse dye laser (flashlamp pumped pulsed dye laser, FPDL) is based
on the theory of selective photothermolysis designed earliest vascular
type of laser, the clinical use of a significant effect, side effects,
has become the treatment of choice for laser vascular diseases. FPDL
early use of wavelength 585 nm, pulse width of 0.45 ms, shorter than
the small blood vessels of the thermal relaxation time, less damage to
surrounding tissue. But further study found that energy concentrated in the period of 0.45 ms yield higher emission energy peaks. The course of treatment is likely to cause blood vessel rupture. Therefore, all patients treated after FPDL will appear purpura. In
addition, vascular wall rupture can be repaired at the proliferation of
endothelial cells surrounding the blood vessel recanalization. Appropriate
to extend the pulse width of the laser heating can be alleviated with
different diameters vessels, intravascular coagulation atrophy. Thus,
to the late 1990s, FPDL above 1.5ms pulse width to make after surgery
significantly reduced the incidence of purpura, human clinical use
longer pulse width FPDL now been cast. On
the other hand, since the penetration is directly related to the laser
wavelength, the longer the wavelength, the deeper the penetration. Therefore, in order to obtain a strong penetration, FPDL increased from the original wavelength 585 nm to 590nm or 595 nm. As Vbeam dye laser. Wavelength of 595 nm. 0.45 ~ 40ms pulse width is adjustable. Compared
with conventional lasers, these long wavelengths FPDL pulse width and
length while maintaining the specificity of vascular injury. But
also has good penetration, for the deeper parts of the hemangioma can
play a role, while a longer pulse width can alleviate thermal
coagulation various diameters of blood vessels, reduce the incidence of
adverse reactions. FPDL
common adverse reactions include purpura and temporary pigmentation
changes, blisters, scarring, skin texture changes and scarring
occasionally occur.
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