Layered fetching catheter

Abstract

The invention discloses a layered fetching catheter, and relates to the field of medical instruments, and the layered fetching catheter is characterized by comprising a telescopic mechanism, a sleeve and an extraction mechanism which is communicated with the sleeve to control the telescopic mechanism to expand and retract in the radial direction; the telescopic mechanism comprises a plurality of metal wires, each metal wire is of a double-layer structure, and each metal wire is divided into an outer-layer metal wire and an inner-layer metal wire; the telescopic mechanism further comprises a supporting rod for supporting the metal wire to form a claw structure, grooves extending from the top end to one side of the root are formed in the opposite side faces of the supporting rod, and a clamping ring capable of moving up and down is arranged on the inner wall of the supporting rod. The inner-layer metal wire penetrates through the clamping ring and extends outwards to form a claw part structure; the extraction mechanism controls the outer-layer metal wires and the inner-layer metal wires to be linked or independently stretch and expand in a segmented mode, and the clamping ring moves up and down along with movement of the inner-layer metal wires. The invention has the technical effects that the double-mesh basket structure is included, so that small stones can be prevented from falling off.

Description

technical field [0001] The invention relates to the field of medical devices, in particular to a layered catheter for taking objects. Background technique [0002] Choledocholithiasis is a common and frequently-occurring disease in my country. Blockage of the common bile duct by stones often induces complications such as acute cholangitis, obstructive jaundice, and acute biliary pancreatitis, with symptoms such as chills, fever, abdominal pain, and jaundice. Cause shock, long-term calculus stimulation has the risk of cholangiocarcinoma, which is an important disease that endangers human health. [0003] The extraction catheter is widely used in the treatment of stones in different surgical fields such as urology and biliary tract. large gravel. [0004] At present, the Chinese patent with the publication number CN 205411257U discloses a disposable ureter retrieval catheter, which includes a control end and a working end. The push-pull handle, the working end includes the b...

AI Technical Summary

Problems solved by technology

[0005] Although this kind of disposable ureteral extraction catheter can complete the stone extraction operation, the gap of the headless basket is relatively large, so it can only be used to extract larger gravel, and it is easy to miss the gravel with a smaller particle size.

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