In vivo ultrasound lithotripter

Abstract

The invention relates to an intracorporal ultrasonic lithotripter consisting of an ultrasonic transducer and an automatic frequency tracking system, wherein, the ultrasonic transducer comprises more than two groups of piezoelectric ceramic pieces, a counterweight, the piezoelectric ceramic pieces and an amplitude transformer are connected together through hollow bolts, and the ultrasonic transducer is installed in the housing handle made of fire-resistant resin materials. A broken stone probe is connected with the front end of the amplitude transformer, a back cover is connected with the backend of the housing handle by screw threads, a pneumatic stone breaking device or a laser stone breaking device can be connected after the back cover is took down, an air regulation device which can regulate the adsorptive pressure in the operation process conveniently is installed on the side of the back end of the housing handle. The whole transducer can be fumigated in 125 DEG C. The automatic frequency tracking system adopts DDS and large-scale programmable devices, a direct digital frequency synthesizer to generate driving signals of the ultrasonic transducer and a strategy of autotracking after scanning search, thus, the automatic frequency tracking system adapts to the discreteness of the transducer and overcomes effects of a variety of causes on the resonance points.

Description

technical field [0001] The invention relates to a medical instrument for minimally invasive treatment of calculi in the urinary system, in particular to an in vivo ultrasonic lithotripsy instrument. Background technique [0002] For general kidney stones, ureteral stones and bladder stones, extracorporeal shock wave lithotripsy can be used for lithotripsy, or medical holmium laser, medical neodymium laser, pneumatic ballistic lithotripsy and other methods can be used for lithotripsy. Extracorporeal shock wave lithotripsy and ultrasonic lithotripsy are only effective for about 15% of small friable stones. Medical holmium laser, medical neodymium laser and pneumatic lithotripsy can solve the treatment problems of about 80% of stone patients. These treatment methods are carried out with the help of cystoscope and flexible ureteroscope. The laser fiber or the treatment end of the device reaches the stone site through the urethra, and then the stone is crushed by laser energy or...

AI Technical Summary

Problems solved by technology

[0010] The object of the present invention is: to overcome the difficulty of simultaneously operating the pressure regulating needle valve and the exhaust valve with one hand, the ultrasonic lithotripsy machine of the existing ultrasonic lithotripsy transducer in the body has poor stone crushing ability, and can attract stones of different sizes. It is not easy to operate, and the problem of needle tube blockage caused by suction to soft tissue. At the same time, in order to solve the problem that the transducer cannot fully release the power due to the low accuracy of frequency tracking in the automatic frequency tracking scheme using a phase-locked loop circuit The problem that the duty ratio of the two input signals is relatively high for the phase comparator, thus providing an in vivo ultrasonic lithotripsy instrument

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