Electro-optical Q-switch double-frequency double-pulse laser lithotripsy system

Abstract

The invention discloses an electro-optical Q-switch double-frequency double-pulse laser lithotripsy system, relates to the technical field of optical-based medical instruments, and solves the problemof lack of a laser lithotripsy system which can safely crush calculus with different sizes, has high electro-optical efficiency and is easy in changing pulse width. The system comprises a total reflector and an electro-optical Q-switch switch component, a driving circuit, a controller, a pump source, a gain medium, an output mirror, a first focusing mirror, a frequency doubling crystal, a second focusing mirror, a coupling lens and an output optical fiber; the electro-optical Q-switch switch component and the gain medium are positioned between the total reflector and the output mirror; and thecontroller controls the pump source to work, and controls the voltage on the electro-optical Q-switch switch component through the control driving circuit so that the system outputs a double-frequency laser beam with a pulse width between 1 and 1.5 microseconds or between 200 and 300 microseconds. According to the invention, the calculus with larger size can be crushed, the cutting of soft tissues around the calculus can be achieved, the electro-optical efficiency is high, the pulse width is easy to change, and the method is suitable for clinical use.

Description

technical field [0001] The invention relates to the technical field of light-based medical devices, in particular to an electro-optic Q-switch dual-frequency dual-pulse laser lithotripsy system. Background technique [0002] In order to crush the stones in the digestive system and urinary system, humans have invented various methods such as extracorporeal shock wave lithotripsy, electrohydraulic lithotripsy, ultrasonic lithotripsy, and laser lithotripsy. Because laser lithotripsy has many inherent advantages, in addition to the first choice of extracorporeal shock wave for kidney stones, other methods are basically replaced by laser lithotripsy. In laser lithotripsy, Ho:Cr:Tm:YAG 2.1 micron static laser and Nd:YAG 1.064+0.532 micron dual-frequency double-pulse Q-switched laser are currently used clinically. The former has been produced by several domestic units, while the latter is only produced by WOM in Germany, and my country needs to import many units every year. [00...

AI Technical Summary

Problems solved by technology

However, this structure has the following disadvantages: First, to change the output pulse width, the length of the optical fiber inside the optical path needs to be replaced, which requires complex readjustment of the system, which is impossible in clinical use; second, the structure The passive Q-switching crystal is used to realize the output of 1μs laser. Because the resonant cavity loss of passive Q-switching is very high, the electro-optic efficiency of the whole machine is low; the third is that this structure uses long optical fiber and Cr4+: YAG passive Q-switching, Can only output 1μs dynamic gravel pulse

[0005] Therefore, there is a lack of a laser lithotripsy system that can crush stones, can also cut the soft tissue around the stones, has high electro-optic efficiency, and is easy to change the pulse width.

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