Shock-wave lithotripsy device and method

Abstract

The invention discloses a shock-wave lithotripsy device and method. The device comprises a shock-wave generator and a focusing part; the focusing part is provided with a focusing surface and comprisesmultiple sub-focusing parts which can move between the folding position where the symmetry axis opposite to the focusing part is folded and the unfolding position where the symmetry axis opposite tothe focusing surface is unfolded, and when the multiple sub-focusing parts are located at the folding position, the shock wave generated by the shock-wave generator is focused by the focusing surfaceto the focus of the shock-wave lithotripsy device; when the multiple sub-focusing parts move from the folding position to the unfolding position, shock waves generated by the shock-wave generator arefocused by the focusing surface to new focuses of multiple lithotripsy devices. The device is simple in structure and convenient to operate, by changing the shock-wave focus position and sound field characteristics, along with the calculus breaking progress, the sound field is gradually changed to be the low pressure wide sound beam from the high pressure narrow sound beam, and then the calculus crushing efficiency is improved; in addition, vascular tissue damage is avoided.

Description

technical field [0001] The invention relates to the field of medical instruments, in particular to a shock wave lithotripsy device and a lithotripsy method. Background technique [0002] Since its invention in the early 1980s, extracorporeal shock wave lithotripsy (SWL) has revolutionized the treatment of urolithiasis disease, becoming the main modality for fragmentation and comminution of clinical renal and ureteral stones. In vitro and in vivo kidney stone crushing experiments showed that the stones were broken and the stone fragments gradually became smaller due to the propagation of the stress wave in the stone. However, in the later stage of shock wave lithotripsy, the effectiveness of stress wave lithotripsy will be greatly hindered when the size of stone fragments is smaller than half the wavelength of the stress wave in the stone. As the total area of ​​stone fragments becomes larger, the width of the sound beam should also increase accordingly in order to continuou...

AI Technical Summary

Problems solved by technology

Strengthen the cavitation effect by increasing the sound pressure value to achieve the purpose of crushing stones, but the cavitation bubble energy generated by the cavitation effect will cause mechanical deformation of capillaries and cause damage to vascular tissue

[0003] In the existing shock wave lithotripsy device, the focus position of the shock wave is fixed, and there is no direct relationship between the width of the sound beam of the shock wave and the sound pressure value. Although the sound pressure value at the focal point can be adjusted by the output voltage or capacity, the sound beam of the shock wave The width remains unchanged, so that the characteristics of the sound beam and the sound pressure cannot be effectively adjusted simultaneously with the progress of the crushed stone, resulting in a decrease in the crushing efficiency

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