Dual-frequency dual-pulse intracavity laser stone crusher

Abstract

The invention relates to a dual-frequency dual-pulse intracavity laser stone crusher comprising a laser resonant cavity and an output module. The laser resonant cavity includes a laser generating module, a focusing lens, a Q-switched crystal, a first frequency doubling crystal and an output mirror. The laser generating module is used for generating 1064-nm laser; the Q-switched crystal is used forcarrying out Q-switching processing on laser to form pulsed laser; the first frequency doubling crystal is used for carrying out partial frequency doubling on the pulse laser to realize double-frequency pulse laser output with the length of 1064 / 532 nm; the output mirror is used for outputting the dual-frequency pulse laser to the output module; and the output module is used for transmitting thedual-frequency pulse laser to a stone part in the body for stone crushing. According to the invention, the plasma is excited on the surface of the stone by using the 532-nm laser; the plasma is heatedby using the 1064-nm laser to generate a mechanical shock wave to break the stone; and while the stone is crushed, the body tissue does not absorb the 1064 / 532-nm laser and thus the body tissue is protected from being hurt by hot damages. Therefore, only the stone is crushed but the tissue is not hurt, so that the safety of intracavity laser lithotripsy is improved.

Description

technical field [0001] The invention relates to the field of laser technology, in particular to a dual-frequency dual-pulse intracavity laser lithotripsy machine. Background technique [0002] With the continuous development of laser technology and endoscopic technology, intracavitary laser lithotripsy has become one of the most promising and widely used methods for lithotripsy in the digestive, biliary and urinary systems. At present, the most used holmium laser lithotripsy emits a pulsed laser. The wavelength of the generated holmium laser is 2140 nm. The energy is transmitted through the soft optical fiber, so that the water at the end of the optical fiber and the surface of the stone is vaporized to form tiny bubbles. To the stone, the stone gasification and rupture. Although the holmium laser lithotripsy has the advantages of high lithotripsy efficiency, the single pulse of the holmium laser emitted by it has a tissue penetration depth of about 0.5mm, which has thermal...

AI Technical Summary

Problems solved by technology

Although the holmium laser lithotripsy machine has the advantages of high lithotripsy efficiency, the tissue penetration depth of the holmium laser single pulse emitted by it is about 0.5 mm, which has thermal damage to the surrounding tissue and has the ability to vaporize and cut soft tissues, which can cause ureter, Renal pelvis mucosal injury, perforation and stenosis are prone to serious complications. At present, there have been clinical reports of cases of renal function damage, ureteral perforation and postoperative infection caused by holmium laser

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