CN212879469U - Three-wire mesh basket structure and stone taking assembly comprising same - Google Patents

Abstract

The utility model relates to a three-wire basket structure and a stone taking assembly comprising the same, which comprises a sheath pipe and three wire guide pipes fixed at the front end of the sheath pipe, wherein the wire guide pipes are elastic pipes, and the rear ends of the wire guide pipes are communicated with the sheath pipe; the front end of the mesh guide pipe is an open end; the sheath tube is connected with a push-pull wire in a sliding manner, the front end of the push-pull wire is connected with three nickel-titanium wires, and each nickel-titanium wire is correspondingly matched with one mesh wire guide tube to be penetrated in a sliding manner; the front end of each nickel-titanium wire penetrates out of the opening end and is fixed with the opening end of the adjacent mesh wire guide pipe, and the three nickel-titanium wires and the mesh wire guide pipe are matched to form the triangular conical mesh basket in an opening state. Through the design of the three-wire mesh basket structure, when the three-wire mesh basket is unfolded, the mesh basket is in a triangular cone shape, and the bottom surface of the mesh basket is in an open shape; when the sheath is contracted, the nickel-titanium wire is contracted into the sheath; the basket can collect big calculus piece and little calculus piece simultaneously, has avoided the condition that need change different calculus-taking baskets in the operation.

Description

Three-wire mesh basket structure and stone taking assembly comprising same

Technical Field

The utility model relates to a three silk screen basket structures and stone extraction subassembly that contains three silk screen basket structures.

Background

Renal calculus is a common disease of the urinary system, metabolic abnormality of the body, obstruction of the urinary tract, infection, foreign matters and use of medicines are common causes of calculus formation, and with the development of science and technology, ureter soft lens lithotripsy becomes one of the methods for treating renal calculus or calculus at the upper segment of ureter. The holmium laser is applied under the soft lens to crush the calculus and then the calculus is taken out as much as possible, and the calculus taking basket is a device for taking out calculus fragments after the calculus is broken under the soft lens of the ureter. The current four silk calculus extraction basket structure is more single, and the specification is also more single, in the operation, because the size of calculus is uncontrollable to various size difference's piece coexists under most circumstances, just so need change different calculus extraction baskets and get the stone, change different calculus extraction baskets and got the stone and increased the time of operation, increased patient's misery and operation expense and also strengthened the operation risk simultaneously. The prior art urgently needs a three-wire mesh basket structure with a large opening and capable of collecting large stone fragments and small stone fragments simultaneously and a stone taking assembly comprising the three-wire mesh basket structure.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome the defect that exists among the prior art, provide one kind and open the opening great, can collect three wire mesh basket structures of big calculus piece and little calculus piece simultaneously and contain the subassembly of getting the stone of three wire mesh basket structures.

The technical scheme of the utility model is to provide a three-wire mesh basket structure, which comprises a sheath pipe and three wire mesh guide pipes fixed at the front end of the sheath pipe, wherein the wire mesh guide pipes are elastic pipes, and the rear ends of the wire mesh guide pipes are communicated with the sheath pipe; the front end of the mesh guide pipe is an open end;

the sheath tube is connected with a push-pull wire in a sliding manner, the front end of the push-pull wire is connected with three nickel-titanium wires, and each nickel-titanium wire is correspondingly matched with one mesh wire guide tube to be penetrated in a sliding manner; the front end of each nickel-titanium wire penetrates out of the opening end and is fixed with the opening end of the adjacent mesh wire guide pipe, and the three nickel-titanium wires and the mesh wire guide pipe are matched to form the triangular conical mesh basket in an opening state.

Through the design of the three-wire mesh basket structure, when the three-wire mesh basket is unfolded, the mesh basket is in a triangular cone shape, and the bottom surface of the mesh basket is in an open shape; when the sheath is contracted, the nickel-titanium wire is contracted into the sheath; the basket can collect big calculus piece and little calculus piece simultaneously, has avoided the condition that needs to change different calculus-taking baskets in the operation to shorten the time of operation, reduced patient's misery and operation expense, also reduced the operation risk simultaneously.

Preferably, the front ends of the three nickel-titanium wires are respectively fixed with the opening ends of the corresponding mesh wire guide pipes, and the opening ends of the corresponding mesh wire guide pipes are the opening ends of the mesh wire guide pipes on the clockwise adjacent side or the opening ends of the mesh wire guide pipes on the counterclockwise adjacent side. By adopting the design, the triangular conical net basket can be formed.

Preferably, the mesh wire guide tube comprises a sliding tube and a connecting tube which are arranged side by side, the sliding tube is matched with the nickel-titanium wire to be slidably arranged, the connecting tube is matched and fixed with the front end of the nickel-titanium wire, the front end part of the connecting tube is connected with a fixed sleeve, and the front end of the nickel-titanium wire is fixedly connected with the fixed sleeve. Due to the design, the friction between the nickel-titanium wires can be avoided in the opening and tightening processes of the triangular conical mesh basket.

Preferably, the front end of the push-pull wire is fixedly connected with the three nickel-titanium wires through welding or a heat-shrinkable tube. Such a design is a further optimization of the solution.

Preferably, the push-pull wire comprises a push section at the rear section and a grinding conical section at the front end, the push section is a nickel-titanium wire, and the diameter range of the nickel-titanium wire at the push section is 0.25-0.35 mm; the diameter of the thinnest front end of the pushing section is 0.15-0.25mm, and the length of the pushing section is 120-180 mm. Due to the design, the pushing section is arranged to be the nickel-titanium wire, compared with the existing spring tube, the pushing performance of the whole wire at the position of the pushing section can be greatly improved due to the structure that the nickel-titanium wire of the pushing section is combined with the sheath tube, and the mesh basket can be more easily put in and taken out of the endoscope; and the design of the grinding conical section improves the passing performance of the whole wire at the position of the grinding conical section, and particularly when the wire passes through an S-shaped curve with the diameter of 10mm, the wire can be easily opened and can adapt to work in a complex cavity channel.

The sheath tube is made of PEEK or a braided tube; the mesh guide pipe is made of PTFE or PI; the fixing sleeve is made of PTFE. By the design, the quality of the wire can be improved.

A stone taking assembly comprising a three-wire basket structure comprises the three-wire basket structure and further comprises a handle main body, wherein a push rod is connected to the handle main body in a front-back sliding mode, a sheath tube fixing tube is arranged at the front end of the push rod, a push-pull wire fixing portion is arranged at the rear end of the handle main body, a sheath tube penetrates through the sheath tube fixing tube, and the outer wall of the sheath tube is fixedly connected with the sheath tube fixing tube; the rear end of the push-pull wire is fixedly connected with the push-pull wire fixing part. By the design, the sheath tube and the push-pull wire can slide relatively, so that an operator can conveniently open and fold the three-wire basket and the sheath tube can pass through the ureter soft lens.

Preferably, the handle main body is tubular, and the side wall of the handle main body is provided with an installation groove; the handle is characterized in that a guide post is inserted in the handle main body, the outer wall of the guide post is provided with rotation limiting plates, and the rotation limiting plates are arranged in pairs and are respectively matched with notches at the rear end parts of the mounting grooves for limiting; the rear end part of the guide post is provided with a sliding limiting ring, notches are symmetrically formed in the sliding limiting ring, the sliding limiting ring is separated into sliding limiting sub-rings, and the front surface of each sliding limiting sub-ring is matched with the rear end surface of the corresponding mounting groove for limiting; the rear end of each sliding limiting sub-ring is provided with a push-pull wire clamping block, and the two push-pull wire clamping blocks are matched to clamp and fix the rear end of the push-pull wire. Such design can be through guide post and mounting groove cooperation to it is fixed to push away the wire rear end.

Preferably, the upper surface of the guide post is an arc-shaped surface, the push rod is provided with a sliding cover plate matched with the arc-shaped surface, and the sliding cover plate covers the arc-shaped surface and is matched with the arc-shaped surface to slide back and forth;

a sliding guide lug is convexly arranged on the arc-shaped surface, and a sliding groove matched with the sliding guide lug to slide is formed in the sliding cover plate; the upper surface of the sliding cover plate is convexly provided with a limiting convex edge, and the sliding groove is arranged in the limiting convex edge; the limiting convex edge is matched with the notch of the mounting groove for limiting; and push-pull inclined blocks are arranged outside the limiting convex ribs. By the design, the guide column and the push rod can be in sliding fit and limited.

Preferably, the rear ends of the rotation limiting plates and the adjacent sliding limiting sub-rings are integrally formed, and the front ends of the paired rotation limiting plates are provided with push rod limiting blocks; the rear end of the handle body is in threaded fit connection with a rear end cover, and the rear end cover covers the position of the push rod limiting block. By the design, the overall strength and the appearance attractiveness of the guide column are improved.

The utility model has the advantages and the beneficial effects that: through the design of the three-wire mesh basket structure, when the three-wire mesh basket is unfolded, the mesh basket is in a triangular cone shape, and the bottom surface of the mesh basket is in an open shape; when the sheath is contracted, the nickel-titanium wire is contracted into the sheath; the basket can easily snatch big calculus piece and lithangiuria piece, does not need to spend time location to go the hitch stone with the basket of four silk structures, has avoided the condition that needs to change the different basket of getting the stone in the operation to shorten the time of operation, reduced patient's misery and operation expense, also reduced the operation risk simultaneously. The rotation synchronism of the four-wire basket in the bent curve can be influenced, and the calculus can not be taken well by sleeving, the utility model discloses a three-wire basket can move freely in S-shaped curve, and is flexible as usual, does not need many times to adjust the position and just can accurately catch the calculus, saves doctor' S energy and can also alleviate the misery for patient.

Drawings

FIG. 1 is a perspective view of the basket mechanism of the present invention;

FIG. 2 is a schematic view of the overall structure of the stone removing assembly;

FIG. 3 is a cross-sectional structural view of the handle body;

FIG. 4 is an enlarged view of the structure at A in FIG. 3;

FIG. 5 is a perspective view of the handle body;

FIG. 6 is an exploded view of the handle body and other components;

FIG. 7 is an exploded view of the main body of the handle and other components (from another perspective);

fig. 8 is an exploded view (from another perspective) of the handle body and other components.

In the figure: 1. a sheath tube; 2. a mesh guide tube; 3. an open end; 4. pushing and drawing wires; 5. a nickel titanium wire; 6. a sliding tube; 7. a connecting pipe; 8. fixing the sleeve; 9. a pushing section; 10. grinding the conical section; 11. a handle body; 12. a push rod; 13. a sheath tube fixing tube; 14. a push-pull wire fixing part; 15. a threaded connection section; 16. protecting the front tube; 17. mounting grooves; 18. a guide post; 19. rotating the limiting plate; 20. sliding the limit sub-ring; 21. a notch; 22. a push-pull wire clamping block; 23. an arc-shaped surface; 24. a sliding cover plate; 25. a sliding guide projection; 26. a sliding groove; 27. a limiting convex rib; 28. pushing and pulling the inclined block; 29. a push rod limiting block; 30. a rear end cap; 31. a front connecting pipe; 32. a rear connecting pipe; 33. and (5) reinforcing ribs.

Detailed Description

The following description will further describe embodiments of the present invention with reference to the accompanying drawings and examples. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.

Example 1

As shown in fig. 1 to 8, a three-wire mesh basket structure includes a sheath tube 1 and three wiremesh guide tubes 2 fixed at the front end of the sheath tube 1, the wiremesh guide tubes 2 are elastic tubes and are provided, and the rear ends of the wiremesh guide tubes 2 are communicated with the sheath tube 1; the front end of themesh guide tube 2 is anopen end 3;

the sheath tube 1 is connected with a push-pull wire 4 in a sliding manner, the front end of the push-pull wire 4 is connected with three nickel-titanium wires 5, and each nickel-titanium wire 5 is correspondingly matched with one meshwire guide tube 2 to be penetrated in a sliding manner; the front end of each nickel-titanium wire 5 penetrates out of the openingend 3 and then is fixed with the openingend 3 of the adjacent meshwire guide pipe 2, and the three nickel-titanium wires 5 are matched with the meshwire guide pipe 2 to form the triangular conical mesh basket in an opening state.

The front ends of the three nickel-titanium wires 5 are respectively fixed with the opening ends 3 of the correspondingmesh guide pipes 2, and the opening ends 3 of the correspondingmesh guide pipes 2 are the opening ends 3 of themesh guide pipes 2 on the clockwise adjacent side or the opening ends 3 of themesh guide pipes 2 on the counterclockwise adjacent side.

Meshsilk stand pipe 2 includesslide tube 6 and connecting pipe 7 that set up side by side,slide tube 6 andnickel titanium silk 5 cooperation slip are worn to establish, connecting pipe 7 is fixed with the cooperation of 5 front ends of nickel titanium silk, end connection has fixingsleeve 8 before the connectingpipe 7, 5 front ends of nickel titanium silk and 8 fixed connection of fixing sleeve.

The front end of the push-pull wire 4 is fixedly connected with three nickel-titanium wires 5 through welding or heat shrink tubes.

The push-pull wire 4 comprises a push section 9 at the rear section and a grinding conical section 10 at the front end, wherein the push section 9 is a nickel-titanium wire 5, and the diameter range of the nickel-titanium wire of the push section 9 is 0.25-0.35 mm; the diameter of the thinnest front end of the grinding conical section 10 is 0.15-0.25mm, and the length of the pushing section is 120-180 mm. The length of the pushing section 9 is preferably 1000mm or more.

The sheath tube 1 is made of PEEK or a braided tube; themesh guide pipe 2 is made of PTFE; the fixingsleeve 8 is made of PTFE.

When the sheath tube is used, themesh guide tubes 2 have elasticity, the open ends 3 of the threemesh guide tubes 2 are far away or close under the action of the push-pull wires 4, and preferably, the threemesh guide tubes 2 are uniformly distributed at the end part of the sheath tube 1; the structure has the advantages that the head part at the far end is only formed by combining three nickel-titanium wires 5 and themesh guide pipe 2, stones do not need to be removed like a four-wire mesh basket, the stones can be grabbed like hands, and the head part is only formed by three nickel-titanium wires 3 and themesh guide pipe 2, so that the stones can be received as thick as the sheath pipe 1 during recovery, and the stones can be conveniently put in and taken out of the endoscope.

When the front end of the push-pull wire 4 is far away from themesh guide tube 2, each nickel-titanium wire 5 retracts from the slidingtube 6, and because the connecting tube 7 is matched and fixed with the front end of the nickel-titanium wire 5, the open ends 3 of the threemesh guide tubes 2 are closed and combined into a bundle (in a state of not taking stones), so that the endoscope and organs can conveniently pass through;

the push-pull wire 4 comprises a push section 9 at the rear section and a grinding conical section 10 at the front end, the push section 9 is a nickel-titanium wire 5, the push section 9 keeps the hardness of part of wires (the push section 9 and a sheath tube 1 outside the push section 9) of the push section 9, the pushing performance of the wires is kept, the grinding conical section 10 can be sent to the position of a lithotomy organ, when the wires (the grinding conical section 10 and the sheath tube 1 outside the grinding conical section 10) of the grinding conical section 10 are at the position of the lithotomy organ, especially when passing through an S-shaped curve, the front section is thin and the rear section is thick, the wires can easily pass through the S-shaped curve, the basket is smoothly opened, and the S-shaped curve can adapt to work in a complex cavity channel; the minimum diameter of the S-shaped bend through which the application can pass is 10 mm.

When 4 front ends of push-pull silk are close towire netting stand 2, everynickel titanium silk 5 from theslide tube 6 roll-off, because connecting pipe 7 is fixed with the cooperation of 5 front ends of nickel titanium silk,nickel titanium silk 5 is the arc (memory metal design shape) between theopen end 3 of two adjacentwire netting stand 2, the basket that threenickel titanium silk 5 cooperations were constituteed is the triangle-shaped toper, and the opening is forward, can collect big calculus piece and litulus piece simultaneously, the condition of the different stone basket of getting that needs to be changed in having avoided the operation.

After the stone fragments enter the triangular net basket, the net basket is contracted and tightly sleeved, and the stone fragments are taken out of the human body along with the sheath tube 1.

Example 2

A stone taking assembly comprising a three-wire basket structure comprises the three-wire basket structure of embodiment 1 and further comprises a handlemain body 11, wherein apush rod 12 is connected to the handlemain body 11 in a front-back sliding manner, a sheathtube fixing tube 13 is arranged at the front end of thepush rod 12, a wire pushing and pulling fixing part 14 is arranged at the rear end of the handlemain body 11, a sheath tube 1 penetrates through the sheathtube fixing tube 13, and the outer wall of the sheath tube 1 is fixedly connected with the sheathtube fixing tube 13; the rear end of the push wire 4 is fixedly connected with a push wire fixing part 14. The rear part of the sheathtube fixing tube 13 is provided with a threadedconnection section 15, and the threadedconnection section 15 is connected with aprotection front tube 16 in a matching manner.

The handlemain body 11 is tubular, and the side wall of the handle main body is provided with aninstallation groove 17; aguide post 18 is inserted in the handlemain body 11, rotation limiting plates 19 are arranged on the outer wall of theguide post 18, and the rotation limiting plates 19 are arranged in pairs and are respectively matched with the notches at the rear end parts of the mountinggrooves 17 for limiting; the rear end part of theguide post 18 is provided with a sliding limiting ring,notches 21 are symmetrically formed in the sliding limiting ring, the sliding limiting ring is separated into a sliding limitingsub-ring 20, and the front surface of the sliding limitingsub-ring 20 is matched with the rear end surface of the mountinggroove 17 for limiting; the rear end of each sliding limitingsub-ring 20 is provided with a push-pullwire clamping block 22, and the two push-pull wire clamping blocks 22 are matched to clamp and fix the rear end of the push-pull wire 4.

The upper surface of theguide column 18 is an arc-shaped surface 23, thepush rod 12 is provided with a sliding cover plate 24 matched with the arc-shaped surface 23, and the sliding cover plate 24 covers the arc-shaped surface 23 and is matched with the arc-shaped surface 23 to slide back and forth; the cross section of theguide post 18 is C-shaped, and an elastic clamping space is formed by gaps among the push-pull wire clamping blocks 22,gaps 21 among the sliding limitingsub-rings 20 and intervals among the rotating limiting plates 19; after therear end cover 30 is in threaded fit with the rear end of thehandle body 11, the push-pullwire clamping block 22 can be restrained to clamp therear connecting pipe 32. The bottom of theguide post 18 is further provided with a reinforcingrib 33, the reinforcingrib 33 is arranged on the front side of the sliding limitingsub-ring 20, and the C-shaped opening of the cross section of theguide post 18 is connected with the rib to ensure the resilience strength of the elastic clamping space.

A sliding guideconvex block 25 is convexly arranged on the arc-shaped surface 23, and a sliding groove 26 which is matched with the sliding guideconvex block 25 to slide is formed on the sliding cover plate 24; the upper surface of the sliding cover plate 24 is convexly provided with a limiting convex rib 27, and the sliding groove 26 is arranged in the limiting convex rib 27; the limiting convex ridge 27 is matched with the notch of the mountinggroove 17 for limiting; and a push-pullinclined block 28 is arranged outside the limiting convex rib 27.

The rear ends of the rotation limiting plates 19 and the adjacent sliding limitingsub-rings 20 are integrally formed, and the front ends of the paired rotation limiting plates 19 are provided with pushrod limiting blocks 29; the rear end of thehandle body 11 is in threaded fit connection with arear end cover 30, and the rear end cover 30 covers the position of the pushrod limiting block 29.

When the sheath tube is used, the rear end of the sheath tube 1 penetrates through the sheathtube fixing tube 13 and theguide column 18 to the front end of the push-pullwire clamping block 22, and the push-pull wire 4 extends out of the rear end of the sheath tube 1 and is matched with the two push-pull wire clamping blocks 22 to be clamped and fixed; the sheathtube fixing tube 13 and the front connectingtube 31 are integrally formed, the front connecting tube 31 (the material of the front connectingtube 31 is PET) and the outer wall of the sheath tube 1 are fixed in a heat shrinkage mode, the push-pull wire 4 is fixedly provided with a rear connecting tube 32 (the material of therear connecting tube 32 is 304 stainless steel tube or PET heat shrinkage tube) from the rear end of the sheath tube 1, and the push-pullwire clamping block 22 is matched to clamp and fix therear connecting tube 32;

when the push-pullinclined block 28 drives thepush rod 12 to slide forwards, thepush rod 12 drives the sheath tube 1 to slide forwards relative to the push-pull wire 4, and the net basket is tightened; when the push-pullinclined block 28 drives thepush rod 12 to slide backwards, thepush rod 12 drives the sheath tube 1 to slide backwards relative to the push-pull wire 4, and the basket is opened.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the technical principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.

Claims (10)

1. A three-wire mesh basket structure, its characterized in that: the mesh guiding tube is an elastic tube and is provided with three, and the rear end of the mesh guiding tube is communicated with the sheath tube; the front end of the mesh guide pipe is an open end;

the sheath tube is connected with a push-pull wire in a sliding manner, the front end of the push-pull wire is connected with three nickel-titanium wires, and each nickel-titanium wire is correspondingly matched with one mesh wire guide tube to be penetrated in a sliding manner; the front end of each nickel-titanium wire penetrates out of the opening end and is fixed with the opening end of the adjacent mesh wire guide pipe, and the three nickel-titanium wires and the mesh wire guide pipe are matched to form the triangular conical mesh basket in an opening state.

2. The three wire mesh basket structure of claim 1, wherein: the front ends of the three nickel-titanium wires are respectively fixed with the opening ends of the corresponding mesh wire guide pipes, and the opening ends of the corresponding mesh wire guide pipes are the opening ends of the mesh wire guide pipes on the clockwise adjacent side or the opening ends of the mesh wire guide pipes on the counterclockwise adjacent side.

3. The three wire mesh basket structure of claim 2, wherein: the mesh wire guide tube comprises a sliding tube and a connecting tube which are arranged side by side, the sliding tube is matched with the nickel-titanium wire to slide and penetrate, the connecting tube is matched and fixed with the front end of the nickel-titanium wire, the front end of the connecting tube is connected with a fixing sleeve, and the front end of the nickel-titanium wire is fixedly connected with the fixing sleeve.

4. The three wire mesh basket structure of claim 2, wherein: the front end of the push-pull wire is fixedly connected with the three nickel-titanium wires through welding or a heat-shrinkable tube.

5. The three wire mesh basket structure of claim 1, wherein: the push-pull wire comprises a push section at the rear section and a grinding conical section at the front end, wherein the push section is a nickel-titanium wire, and the diameter range of the nickel-titanium wire at the push section is 0.25-0.35 mm; the diameter of the thinnest front end of the grinding conical section is 0.15-0.25mm, and the length of the grinding conical section is 120-180 mm.

6. The three wire mesh basket structure of claim 3, wherein: the sheath tube is made of PEEK or a braided tube; the mesh guide pipe is made of PTFE or PI; the fixing sleeve is made of PTFE.

7. A stone removal assembly comprising a three-wire mesh basket structure, characterized in that: the three-wire basket structure comprises the three-wire basket structure of any one of claims 1 to 6, and further comprises a handle body, wherein a push rod is connected to the handle body in a front-back sliding manner, a sheath fixing tube is arranged at the front end of the push rod, a push-pull wire fixing part is arranged at the rear end of the handle body, the sheath is arranged in the sheath fixing tube in a penetrating manner, and the outer wall of the sheath is fixedly connected with the sheath fixing tube; the rear end of the push-pull wire is fixedly connected with the push-pull wire fixing part.

8. The stone extraction assembly comprising a three wire basket structure of claim 7, wherein: the handle main body is tubular, and the side wall of the handle main body is provided with an installation groove; the handle is characterized in that a guide post is inserted in the handle main body, the outer wall of the guide post is provided with rotation limiting plates, and the rotation limiting plates are arranged in pairs and are respectively matched with notches at the rear end parts of the mounting grooves for limiting; the rear end part of the guide post is provided with a sliding limiting ring, notches are symmetrically formed in the sliding limiting ring, the sliding limiting ring is separated into sliding limiting sub-rings, and the front surface of each sliding limiting sub-ring is matched with the rear end surface of the corresponding mounting groove for limiting; the rear end of each sliding limiting sub-ring is provided with a push-pull wire clamping block, and the two push-pull wire clamping blocks are matched to clamp and fix the rear end of the push-pull wire.

9. The stone retrieval assembly comprising a three wire basket structure of claim 8, wherein: the upper surface of the guide post is an arc-shaped surface, the push rod is provided with a sliding cover plate matched with the arc-shaped surface, and the sliding cover plate covers the arc-shaped surface and is matched with the arc-shaped surface to slide back and forth;

a sliding guide lug is convexly arranged on the arc-shaped surface, and a sliding groove matched with the sliding guide lug to slide is formed in the sliding cover plate; the upper surface of the sliding cover plate is convexly provided with a limiting convex edge, and the sliding groove is arranged in the limiting convex edge; the limiting convex edge is matched with the notch of the mounting groove for limiting; and push-pull inclined blocks are arranged outside the limiting convex ribs.

10. The stone retrieval assembly comprising a three wire basket structure of claim 9, wherein: the rear ends of the rotating limit plates and the adjacent sliding limit sub-rings are integrally formed, and the front ends of the paired rotating limit plates are provided with push rod limit blocks; the rear end of the handle body is in threaded fit connection with a rear end cover, and the rear end cover covers the position of the push rod limiting block.

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