Laser appratus for removing spots

Abstract

A laser apparatus for removing nevus flammeus is composed of a pulse laser power supply with a frequency controllable switch which is serially connected between discharging SCR and high-voltage energy-accumulating capacitor and controlled by a drive module, a solid laser device and a laser output device. Its output laser pulse has wide pulse width and high pulse peak power.

Description

technical field [0001] The invention relates to the field of medical equipment, especially the field of laser medical equipment Background technique [0002] Port wine stain, commonly known as red birthmark, is a vascular disease of the skin. The scarlet mole has brought many inconveniences to people in work and life, especially for female friends who love beauty, and it has caused physical and psychological pain. The lesions are often tight and intradermal and are often difficult to remove with conventional treatments. If the treatment is too superficial to remove the lesion, it will definitely leave a scar if the desired depth of treatment is to be achieved. [0003] With the emergence of laser medical technology, the application of argon ion laser (wavelength 488 / 514.5nm) in the middle and late 1970s proved to be effective in the treatment of red nevus, but the incidence of scars is high, and depigmentation or pigmentation may occur. The subsequently successfully devel...

AI Technical Summary

Problems solved by technology

However, dye lasers still have inherent disadvantages: First, in terms of medical effects, because the pulse width of fuel lasers is generally only a few microseconds, when the output of a certain energy has a very high peak laser power, it is very easy to cause adverse reactions of purpura; Secondly, in terms of equipment maintenance, since the equipment needs to be constantly replaced with dyes, there are disadvantages of complicated maintenance, low work efficiency, and high failure rate of the equipment.

Because the pulse width is too wide, the peak power of the fundamental pulse is low, resulting in low frequency doubling efficiency when the fundamental wave passes through the nonlinear frequency conversion crystal.

Judging from the feedback from doctors in some large hospitals in China, the current second harmonic 532nm green light energy is not strong enough, the treatment efficiency of acne is low, and the medical effect is repeated.

In order to improve the efficiency of this nonlinear optical effect, it is proposed to use an acousto-optic Q switch or an electro-optic Q switch to increase the peak power of the fundamental wave. Although this method improves the frequency doubling efficiency, it also improves the output energy of the second harmonic , but because the ideal laser pulse width time for laser treatment of scarlet acne should be in the range of 1 to 10ms, because the pulse width is too narrow (about a few hundred nanoseconds pulse width) modulated by the Q switch, the output narrow pulse width 532nm laser The ideal treatment effect of bright red nevus cannot be achieved, and what is more, it will cause damage to human skin and cause "purpura" phenomenon

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