Internal extracting device for calculus cavities of urinary systems

Abstract

The invention relates to an internal extracting device for calculus cavities of urinary systems. The internal extracting device comprises a guide tube and a guide wire. A net basket is arranged at a far end of the guide wire, a calculus extracting pocket is fixed onto the net basket and is in the shape of an elongated pocket by means of pre-plasticizing, an opening is formed in a surface of a near end of the calculus extracting pocket, and tiny holes are further formed in the calculus extracting pocket. The internal extracting device for the calculus cavities of the urinary systems has the advantages that large quantities of broken calculi, blood clots and pus clots can be extracted by the internal extracting device at one step, the internal extracting device is free of constraints of the inner diameters of the lumens of the ureters or the inner diameters of operation channels, broken calculus missing in calculus extracting procedures can be prevented, and the broken calculi can be effectively prevented from being poured into the kidneys by water current; injury to the walls of the ureters due to the broken calculi can be prevented, and accordingly the internal extracting device is safe and reliable.

Description

technical field [0001] The invention relates to the field of medical devices, in particular to a settling device for calculi in the urinary system cavity. Background technique [0002] Kidney stones are one of the most common diseases in urology, and minimally invasive treatment techniques have replaced traditional open surgery as the most important treatment for kidney stones. The fundamental purpose of minimally invasive treatment is to completely remove stones. The flexible ureteroscope enters the kidney through the natural orifice of the human body, and the stone is crushed by the holmium laser. The effect is accurate, and it is one of the main minimally invasive treatment methods for kidney stones. In order to improve the stone-clearing rate, after the holmium laser pulverizes the stones, a stone basket is often used to collect the larger broken stones. [0003] Most of the stone baskets used at home and abroad are simple basket structures. For example, Chinese paten...

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Problems solved by technology

[0004] It can be concluded that there are still the following deficiencies in the current set of stone baskets: 1) Whether it is a triangular set of stone baskets or a mesh set of stone baskets, they all adopt the design of centripetal collection, and the stones are spherical after being set, rather than elliptical. Spherical, the number of set stones is limited by the inner diameter of the ureter lumen or the inner diameter of the operating channel, and it is necessary to repeatedly enter the ureter to take stones, which is inefficient; 2) There are gaps between the steel wires after the set stone basket is collected, especially the mesh set stone basket is tightened The mesh behind the inner core is easy to miss stones, and the stone basket itself cannot stop stones, and small stones and gravels are easily washed back to the kidney under the infusion of reverse water flow; 3) The edges and corners of stones will be exposed to the mesh of the stone basket Outside the hole, it is easy to cause the stone basket to fail to pass through the operation channel, and it is very easy to scratch the ureteral wall, causing surgical complications; 4) For blood clots or pus accumulated in the kidney, it is difficult to grasp the stone basket under a soft microscope. low efficiency

[0005] To sum up, there is an urgent need for a safe and reliable intracavitary extraction device for stones in the urinary system, which has high stone removal efficiency, does not miss broken stones, and can collect blood clots and pus at the same time. However, there are no reports about such devices so far

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