Basket device for removing calculus from biliary tract and working method of basket device

Abstract

The invention relates to the technical field of medical instruments, in particular to a biliary tract calculus removal net basket device and a working method thereof. The shell comprises a supporting part and a hard outer sleeve; the suction assembly comprises a first power part and a soft inner sleeve; the extracting assembly comprises a second power part and a net basket; the end, deviating from the first power part, of the inner sleeve is diverged to form a horn mouth which has a contraction state and an adsorption state. When the first power part drives the inner sleeve to move relative to the outer sleeve, the horn mouth completes switching between a contraction state and an adsorption state; when the second power part applies force to the mesh basket and retracts the mesh basket, a negative pressure effect is formed from the interior of the tube body of the inner sleeve to the interior of the accommodating cavity, so that the mesh basket realizes a sleeving and tightening effect on the calculus while the horn mouth realizes a local adsorption effect on the calculus; the calculus taking-out device can be used for quickly and accurately taking out calculi with different sizes and states, and is high in applicability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, and particularly relates to a gallstone removing basket device and a working method thereof. BACKGROUND

[0002] Gallstone is a common disease in surgery, and the gallstone in common bile duct can cause biliary obstruction secondary to jaundice, cholangitis and even pancreatitis, which is life-threatening. Cholangioscopy is a common method for treating gallstones in surgery at present. In this process, a fiber choledochoscope is usually placed along the incision of the biliary tract, and after the gallstone is found, the gallstone is removed by using the push-pull and rotation action of the handle to control the gallstone removing basket to cover the gallstone. The gallstone is removed in the process of moving out of the body by the gallstone removing basket.

[0003] In the above use process, the gallstone removing basket is composed of a plurality of curved flexible metal wire bodies uniformly distributed around a certain axis, and the gap between each flexible metal wire body is large. The gallstone is a polyhedron, a circle or an ellipse, and has a hard texture and a smooth surface. Therefore, when the size of the gallstone is too large or the diameter of the biliary tract is too small, the gallstone is difficult to enter the gallstone removing basket through the gap between the flexible metal wire bodies and be covered in the clinical operation, which is time-consuming and laborious and needs repeated operation, and the internal biliary tract is easily damaged. When the size of the gallstone is small, the gallstone is easily slipped out of the gap between the flexible metal wire bodies in the process of moving out of the body, causing the gallstone to remain.

[0004] In the related art, a negative pressure suction gallstone removing auxiliary device is disclosed in Chinese patent document with application number CN201610884483.5, which includes a stone wrapping device, a fixing seat and a stabilizing device. The stone wrapping device is located at the proximal end of the fixing seat, and the stabilizing device is folded back on the outer circumferential surface of the distal end of the fixing seat. The stone wrapping device is composed of latex, and the stone wrapping device is in a skirt shape and gradually expands outward at an angle of 30 degrees with the axis of the fixing seat. When the negative pressure of the choledochoscope is turned on, the stone wrapping device is contracted and adsorbed on the gallstone, a negative pressure environment is generated, and gallstones of different sizes can be sucked. Although the above-mentioned gallstone removing auxiliary device can ensure that the gallstone can be covered and sucked by the skirt-shaped stone wrapping device, the stone wrapping device needs to be moved repeatedly before work to ensure that the edges of the skirt-shaped stone wrapping device can be evenly distributed around the gallstone. However, the maintenance of this state is uncertain, and for some difficult-to-remove or incarcerated gallstones, the traditional gallstone removing basket needs to be additionally used, which leads to frequent replacement of the operation instrument and the problem of instrument adaptation, increases the complexity of the gallstone removing process, and makes it difficult to achieve the purpose of fast and accurate gallstone removal.

[0005] The information disclosed in this BACKGROUND section is only intended to enhance the understanding of the general background of the application and should not be taken as an acknowledgement or any form of suggestion that this information constitutes prior art in the field. SUMMARY

[0006] The technical problem solved by the present application is to provide a gallbladder stone taking basket device and a working method thereof, and to realize fast and accurate gallbladder stone taking.

[0007] In order to achieve the above-mentioned purpose, the technical solution adopted by the present application is as follows: a gallbladder stone taking basket device, comprising a shell, a suction assembly and a sleeve taking assembly; The shell comprises a supporting part and a hard outer sleeve, the supporting part is provided with a through active cavity in the axial direction, and the outer sleeve is sleeved at one end of the supporting part; The suction assembly comprises a first power part and a soft inner sleeve, the first power part is limited in the active cavity and is provided with a through containing cavity in the axial direction, the inner sleeve is arranged in the same direction as the outer sleeve, is sleeved at one end of the first power part, and the inner sleeve extends out of the active cavity and is located in the pipe body of the outer sleeve; The sleeve taking assembly comprises a second power part and a basket, the second power part is limited in the containing cavity, one end of the basket is connected with the end of the second power part, and when subjected to the action from the second power part, the basket is deformed and limited in the pipe body of the inner sleeve, and the other end of the second power part is led out from the end of the supporting part away from the outer sleeve for the user to apply force; Wherein, the end of the inner sleeve away from the first power part diverges to form a horn mouth, the horn mouth has a contraction state limited in the outer sleeve and an adsorption state extending out of the outer sleeve and partially abutting on the calculus, and the first power part drives the relative movement of the inner sleeve relative to the outer sleeve, and the horn mouth completes the switching between the contraction state and the adsorption state; When the second power part applies force to the basket to retract the basket, the pipe body of the inner sleeve forms a negative pressure effect into the containing cavity, so that the horn mouth realizes the local adsorption effect on the calculus, and the basket realizes the sleeve taking and tightening effect on the calculus.

[0008] Further, the supporting part comprises a first part and a second part which are detachably connected, the first part is provided with a moving groove in the axial direction, the first power part is partially limited in the moving groove, and after the first part is connected with the second part, the second part forms a limiting effect on the limit position of the moving groove.

[0009] Further, the first power part comprises a sliding sleeve, a butt joint and a moving block; The sliding sleeve is limited in the movable cavity, one end of which is contracted to be adapted to the shape of the butt joint and is fixedly connected with the butt joint, and the moving block is fixed on the outer axial surface of the sliding sleeve, and the inner sleeve is sleeved on the butt joint; The moving block is limited in the moving groove and is in sliding connection with the moving groove, and one end of the moving block protruding into the moving groove is arranged on the outer axial surface of the first part.

[0010] Further, the moving block is externally provided with a threaded structure, and the first part is externally provided with a threaded sleeve, and the threaded sleeve is connected with the moving block through the threaded structure.

[0011] Further, the outer axial surfaces of the first part and the second part are locally protruded to form a first abutting part and a second abutting part respectively, and the first abutting part and the second abutting part are respectively abutted with two end parts of the threaded sleeve after the first part and the second part are connected.

[0012] Further, the second power part comprises a handle, a push rod and a sealing block; One end of the push rod is limited in the containing cavity and is fixedly connected with the sealing block, and the other end of the push rod is protruded outside the supporting part through the movable cavity and is fixedly connected with the handle, one end of the sealing block away from the push rod is fixedly connected with the net basket, and the side wall of the sealing block is abutted and compressed with the inner wall of the containing cavity to form a sealing effect.

[0013] Further, the outer axial surface of the push rod is locally protruded to form two clamping parts, and the two clamping parts are symmetrically arranged with the axis of the push rod as the axis of symmetry. Each clamping part comprises a plurality of continuous clamping teeth, and the clamping teeth are arranged in sequence along the outer axial surface of the push rod. The end surface of the second part opposite to the handle is throughly arranged to form a clamping groove, the clamping groove is an elliptical structure, the short axis of the clamping groove is adapted to the diameter of the end surface of the push rod, and the long axis of the clamping groove is adapted to the distance between the end surfaces of the two clamping parts. The push rod has a moving state and a clamping state, when the push rod is in the moving state, the two clamping parts are located on the long axis of the clamping groove, and when the push rod is in the clamping state, the clamping parts form an angle with the long axis of the clamping groove, and the clamping teeth are abutted on the end surface of the second part.

[0014] Further, each clamping tooth has a guide surface and a clamping surface, the clamping surface is connected with the guide surface and the next clamping tooth, and the guide surface is arranged to be inclined towards one end of the handle, and the included angle between the guide surface and the clamping surface is set to an obtuse angle. When the push rod is in the latching state, the latching surface is restricted in the slot by an interference fit. When the push rod switches from the latching state to the moving state, the guide surface is attached to and slides against the side wall of the slot, forming a guiding effect on the movement of the push rod.

[0015] Furthermore, the push rod has a limiting head protruding from one end toward the sealing block, and the sealing block has a recessed end toward the push rod, forming a limiting groove that conforms to the shape of the limiting head. The limiting groove fully covers the limiting head.

[0016] The present invention also provides a method for operating the bile duct stone retrieval basket device as described above, comprising the following steps: The outer cannula, the inner cannula confined within the outer cannula, and the basket confined within the inner cannula are inserted into the bile duct using interventional techniques. When the location of the stone is reached, the basket is released from the inner tube through the second power unit, forming a mesh structure that can accommodate the stone. The inner sleeve is driven by the first power unit to move relative to the outer sleeve, so that the flared mouth switches from a contracted state to an adsorption state. The second power unit applies force to the basket again to retract it, creating a negative pressure inside the inner tube and into the receiving cavity. During this process, the flared opening achieves a local adsorption effect on the stone, and the basket achieves a snug and tightening effect on the stone.

[0017] The beneficial effects of this invention are as follows: By setting a rigid outer sleeve and a soft inner sleeve, when the device moves to the location of the stone, the basket is first released by the second power unit, and the inner sleeve is pushed out of the outer sleeve by the action of the first power unit, so that the flared end partially abuts against the stone. As the second power unit applies force to the basket and retracts the basket, a negative pressure is formed in the receiving cavity, which realizes the local adsorption of the stone, allowing the stone to enter the basket. At the same time, the basket can realize the function of grabbing and tightening the stone. Stones of different sizes and conditions can be quickly and accurately removed, making it highly applicable. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the biliary stone retrieval basket device in an embodiment of the present invention; Figure 2 This is a top view of the bile duct stone retrieval basket device in an embodiment of the present invention; Figure 3 for Figure 2 Sectional view at point AA; Figure 4 This is a schematic diagram of the shell structure in an embodiment of the present invention; Figure 5 This is an exploded view of the casing in an embodiment of the present invention; Figure 6 This is a schematic diagram of the structure of the absorption component in an embodiment of the present invention; Figure 7 This is an exploded view of the absorption component in an embodiment of the present invention; Figure 8 This is a schematic diagram of the structure of the sleeve component in an embodiment of the present invention; Figure 9 This is an exploded view of the overlay component in an embodiment of the present invention; Figure 10 This is a schematic diagram of the push rod in a moving state in an embodiment of the present invention; Figure 11 This is a schematic diagram of the push rod in the latching state in an embodiment of the present invention; Figures 12 to 15 A schematic diagram of the working process of the bile duct stone retrieval basket device; Figure 16 This is a flowchart illustrating the working method of the bile duct stone retrieval basket device in an embodiment of the present invention.

[0020] Reference numerals: 01, stone; 10, shell; 11, support; 11a, movable cavity; 111, first section; 111a, transfer groove; 111b, first abutment; 112, second section; 112a, second abutment; 112b, slot; 12, outer sleeve; 20, suction assembly; 21, first power unit; 21a, receiving cavity; 211, sliding sleeve; 212, connecting joint; 21 3. Moving block; 213a. Threaded structure; 214. Threaded sleeve; 22. Inner sleeve; 22a. Flared mouth; 30. Sleeve assembly; 31. Second power unit; 311. Handle; 312. Push rod; 312a. Limiting head; 313. Sealing block; 313a. Limiting groove; 314. Engaging part; 3141. Locking tooth; 3141a. Guide surface; 3141b. Engaging surface; 32. Net basket. Detailed Implementation

[0021] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0022] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0024] like Figures 1 to 15 The illustrated bile duct stone retrieval basket device includes a housing 10, a suction assembly 20, and a retrieval assembly 30; The housing 10 includes a support part 11 and a rigid outer sleeve 12. The support part 11 has a through movable cavity 11a along the axial direction, and the outer sleeve 12 is sleeved on one end of the support part 11. The suction assembly 20 includes a first power unit 21 and a soft inner sleeve 22. The first power unit 21 is confined in the movable cavity 11a and has a through receiving cavity 21a along the axial direction. The inner sleeve 22 is arranged in the same direction as the outer sleeve 12, is sleeved on one end of the first power unit 21, and extends out of the movable cavity 11a and is located inside the tube of the outer sleeve 12. The sleeve assembly 30 includes a second power unit 31 and a basket 32. The second power unit 31 is confined in the receiving cavity 21a. One end of the basket 32 ​​is connected to the end of the second power unit 31 and deforms when subjected to the action of the second power unit 31, thus confining it within the tube of the inner sleeve 22. The other end of the second power unit 31 extends from the end of the support part 11 away from the outer sleeve 12 for the user to apply force. The inner sleeve 22 diverges from the end opposite to the first power unit 21 to form a flared mouth 22a. The flared mouth 22a has a contracted state that is confined inside the outer sleeve 12 and the outer tube wall abuts against the inner tube wall of the outer sleeve 12, and an adsorption state that extends outside the outer sleeve 12 and the inner tube wall partially abuts against the stone 01. When the first power unit 21 drives the inner sleeve 22 to move relative to the outer sleeve 12, the flared mouth 22a completes the switching between the contracted state and the adsorption state. When the second power unit 31 applies force to the basket 32 ​​and retracts the basket 32, a negative pressure is formed in the inner tube 22 and the receiving cavity 21a, so that the flared mouth 22a achieves a local adsorption effect on the stone 01, while the basket 32 ​​achieves a snag and tightening effect on the stone 01.

[0025] This invention provides a bile duct stone retrieval basket 32 ​​device capable of quickly and accurately removing gallstones 01. In use, the outer tube 12, inner tube 22, and basket 32 ​​of the stone retrieval basket 32 ​​device are first inserted into the bile duct by interventional means. At this time, the inner tube 22 is confined inside the outer tube 12, and the outer tube wall at the flared end 22a abuts against the inner tube wall of the outer tube 12, with the flared end 22a in a contracted state. The basket 32 ​​is deformed and confined within the inner tube 22 by the action of the second power unit 31. That is, from the external structure, it is only necessary to ensure that the head of the outer tube 12 and the basket 32 ​​can be inserted into the bile duct to ensure that the outer tube 12, inner tube 22, and basket 32 ​​all enter the bile duct.

[0026] When the outer sleeve 12, carrying the inner sleeve 22 and the basket 32, reaches the location of the stone 01, the basket 32 ​​can first be released from the inner sleeve 22 by the action of the second power unit 31, forming a mesh structure capable of accommodating the stone 01. However, if the mesh structure fails to capture the stone 01 after the basket 32 ​​is released, or if the captured stone 01 slips out from the gaps in the mesh structure, the basket 32 ​​can be retracted by the reverse action of the second power unit 31, re-confining the basket 32 ​​within the inner sleeve 22. The outer sleeve 12 can be moved again to deliver the inner sleeve 22 and the basket 32 ​​to the location of the stone 01, and the basket 32 ​​can be released again to capture the stone 01. The above steps can be repeated multiple times until the stone 01 is located in the mesh structure of the basket 32. It should be noted that the basket 32 ​​is composed of several curved flexible metal wires evenly distributed around a set axis. The shape can be semi-circular, diamond-shaped, spiral, etc., and can be selected according to the user's needs and the specific situation of the bile duct and the stone 01. No specific limitation is made here.

[0027] After the basket 32 ​​is released and the mesh structure captures the stone 01, several flexible metal wires disperse around the stone 01. The inner sleeve 22 is driven by the first power unit 21 to move relative to the stone, so that the flared mouth 22a extends out of the outer sleeve 12 by about 1-2 mm, thereby switching the flared mouth 22a from a contracted state to an adsorption state. The flared mouth 22a extends out of the outer sleeve 12 and the inner tube wall partially abuts against the stone 01. The stone 01 blocks the flared mouth 22a, thus forming a closed space between the inner sleeve 22 and the receiving cavity 21a.

[0028] Subsequently, the second power unit 31 applies force to the basket 32 ​​again, causing the basket 32 ​​to retract. Due to the sealing effect formed between the stone 01 and the flared opening 22a, a negative pressure is created inside the inner sleeve 22 and into the receiving cavity 21a. Simultaneously, because the inner sleeve 22 is made of a soft material, the flared opening 22a, due to the negative pressure, forms a wrapping effect at the contact point with the stone 01, tightly adsorbing the stone 01 onto the flared opening 22a. Under this adsorption, the relative position of the stone 01 with the basket 32 ​​is fixed, and it enters the receiving cavity. In the mesh structure of stone 01, as the basket 32 ​​retracts, several flexible metal wires contract, achieving the function of catching and tightening stone 01. When the first power unit 21 drives the inner sleeve 22 to extend, causing the inner wall of the flared opening 22a to partially abut against stone 01, it does not affect the release of the basket 32 ​​or the wrapping effect of stone 01. However, it can ensure that the abutment between stone 01 and flared opening 22a forms a sealed space between the inner sleeve 22 and the receiving cavity 21a, thereby ensuring that stone 01 can be adsorbed under subsequent negative pressure.

[0029] After the above operations are completed, the current state can be maintained, and the entire device can be removed from the human body. After removal, the adsorption and wrapping effect of the inner sleeve 22 and the basket 32 ​​on the stone 01 is released by the first power unit 21 and the second power unit 31 respectively, thereby removing the stone 01. During this process, the stone retrieval basket 32 ​​device can accurately and quickly remove the stone 01 from the bile duct without being limited by the size and state of the stone 01, and has strong applicability. Based on the above embodiments, in order to facilitate product assembly, the support part 11 is provided with a first part 111 and a second part 112 that are detachably connected. The first part 111 is provided with a sliding groove 111a along the axial direction. The first power part 21 is partially confined in the sliding groove 111a. After the first part 111 and the second part 112 are connected, the second part 112 forms a limiting effect on the extreme position of the sliding groove 111a. In the production process, in order to simplify the forming process of the support part 11, the first part 111 and the second part 112 can be formed separately, and then the formed first part 111 and the second part 112 can be assembled and connected to form a whole. The first part 111 and the second part 112 can be connected by threaded connection, plug-in or butt joint. In this embodiment, in order to ensure the stability of the connection, the first part 111 and the second part 112 are connected by threaded connection.

[0030] A sliding groove 111a is provided along the axial direction on the first section 111. The first power unit 21 is partially confined in the sliding groove 111a. The user can control the first power unit 21 at the position of the sliding groove 111a, thereby driving the inner sleeve 22 to move only along the length direction of the sliding groove 111a, ensuring the stability of the inner sleeve 22's extension and repositioning. During production, the structure of the sliding groove 111a can be directly formed together with the first section 111, or the first section 111 can be formed first, and the sliding groove 111a can be machined later. After the first section 111 is connected to the second section 112, the second section 112 forms a limiting effect on the extreme position of the sliding groove 111a, that is, by limiting the extreme position of the movement of the first power unit 21, the extreme position of the movement of the inner sleeve 22 is limited.

[0031] Based on the above embodiments, the first power unit 21 includes a sliding sleeve 211, a coupling joint 212, and a moving block 213; the sliding sleeve 211 is confined in the movable cavity 11a, one end of which is contracted to adapt to the shape of the coupling joint 212 and is fixedly connected to the coupling joint 212; the moving block 213 is fixed on the outer axial surface of the sliding sleeve 211, and the inner sleeve 22 is sleeved on the coupling joint 212; the moving block 213 is confined in the shift groove 111a and is slidably connected to the shift groove 111a, and one end of the moving block 213 extending into the shift groove 111a protrudes from the outer axial surface of the first part 111.

[0032] During operation, since the end of the moving block 213 that extends into the shift groove 111a protrudes from the outer axial surface of the first section 111, the user can change the relative position of the sliding sleeve 211 in the movable cavity 11a by changing the relative position of the moving block 213 and the shift groove 111a. Under the connection of the connector 212, the movement of the sliding sleeve 211 will drive the inner sleeve 22 to move synchronously along the axial direction, thereby realizing the switching of the flared mouth 22a between the contracted state and the adsorption state.

[0033] Based on the above embodiments, in order to precisely control the movement of the inner sleeve 22, the moving block 213 is provided with a threaded structure 213a on the outside, and the first part 111 is fitted with a threaded sleeve 214. The threaded sleeve 214 is connected to the moving block 213 through the threaded structure 213a. When the flared mouth 22a extends out of the outer sleeve 12 and the inner tube wall partially abuts against the stone 01, the user needs to control the second power unit 31 to move in the opposite direction along the receiving cavity 21a to apply force and retract the basket 32. During this process, the flared mouth 22a needs to be kept extended and always in partial contact with the stone 01. By assembling the threaded sleeve 214 with the threaded structure 213a on the outside of the moving block 213, the position of the moving block 213 and the sliding sleeve 211 is restricted from changing during the application of force by the second power unit 31, thereby ensuring the partial contact of the flared mouth 22a, effectively ensuring the formation of negative pressure, avoiding stone removal failure, and ensuring the success rate of stone removal.

[0034] Based on the above embodiment, in order to limit the position of the threaded sleeve 214 relative to the first portion 111, the outer shaft surfaces of the first portion 111 and the second portion 112 are partially protruding to form a first abutting portion 111b and abutting portion 112a, respectively. After the first portion 111 and the second portion 112 are connected, the first abutting portion 111b and the second abutting portion 112a abut against the two ends of the threaded sleeve 214, respectively. That is, at this time, the length of the threaded sleeve 214 is equivalent to the length of the shift groove 111a. The abutting action between the two ends of the threaded sleeve 214 and the first abutting portion 111b and the second abutting portion 112a leaves space for the threaded sleeve 214 to rotate, thus limiting the threaded sleeve 214 from driving the moving block 213 to move relative to each other directly along the direction of the shift groove 111a, so as to ensure the control effect on the first power unit 21.

[0035] Based on the above embodiments, the second power unit 31 includes a handle 311, a push rod 312, and a sealing block 313; one end of the push rod 312 is confined within the receiving cavity 21a and fixedly connected to the sealing block 313; the other end extends outward from the support part 11 through the movable cavity 11a and is fixedly connected to the handle 311; the end of the sealing block 313 facing away from the push rod 312 is fixedly connected to the basket 32, and the side wall of the sealing block 313 abuts against and presses against the inner wall of the receiving cavity 21a to form a sealing effect; it can be controlled by the handle 311. 1. The push rod 312 is moved, which in turn causes the sealing block 313 and the receiving cavity 21a to move relative to each other along the axial direction, thereby realizing the release and retrieval of the basket 32. During the movement, the sealing block 313 abuts against and presses against the inner wall of the receiving cavity 21a, thus ensuring the sealing effect between the second power unit 31 and the receiving cavity 21a when the basket 32 ​​is retrieved, ensuring the formation of negative pressure from the inner sleeve 22 to the receiving cavity 21a, and ensuring that the flared mouth 22a can adsorb the stone 01.

[0036] Based on the above embodiments, to prevent the stone 01 from slipping due to user error during removal from the body, a partial protrusion is made on the outer axial surface of the push rod 312 to form two engaging portions 314. The two engaging portions 314 are symmetrically arranged about the axis of the push rod 312. Each engaging portion 314 includes several continuous teeth 3141, which are arranged sequentially along the outer axial surface of the push rod 312. The end face of the second portion 112, which is opposite to the handle 311, is through-hole to form a groove 112b. The slot 112b has an elliptical structure. The minor axis of the slot 112b is adapted to the diameter of the end face of the push rod 312, and the major axis of the slot 112b is adapted to the distance between the line connecting the two engaging parts 314 on the end face. The push rod 312 has a moving state and a engaging state. When the push rod 312 is in the moving state, both engaging parts 314 are located on the major axis of the slot 112b. When the push rod 312 is in the engaging state, the engaging parts 314 and the major axis of the slot 112b form an angle, and the locking teeth 3141 abut against the end face of the second part 112.

[0037] During use, when the basket 32 ​​is not released, the push rod 312 is in a locked state. The locking part 314 and the long axis of the slot 112b form an angle, and the locking teeth 3141 abut against the end face of the second part 112, restricting the push rod 312 from moving along the axial direction, so that the basket 32 ​​can be restricted in the inner sleeve 22 and not released. When the basket 32 ​​needs to be released, the second part 112 is rotated, so that the slot 112b on the end face of the second part 112 rotates relative to the end face of the push rod 312 until both locking parts 314 are located on the long axis of the slot 112b, and the push rod 312 can move freely along the axis. The movement of the wire and the slot 112b do not restrict the push rod 312, thus releasing the basket 32; when the basket 32 ​​has achieved the function of catching and tightening the stone 01, by rotating the second part 112, the push rod 312 is put into the locking state again. The locking tooth 3141 corresponding to the position of the push rod 312 abuts against the end face of the second part 112, thereby ensuring that the push rod 312 can maintain this position to control the basket 32 ​​and the stone 01 to be moved out of the body together. The user does not need to apply force to the handle 311 to maintain this position, which reduces the difficulty of operation and ensures the stability of the stone removal process.

[0038] It should be noted that the minor axis of the slot 112b refers to the line connecting the two endpoints of the elliptical structure of the slot 112b in the minor axis direction, while the major axis refers to the line connecting the two endpoints of the elliptical structure of the slot 112b in the major axis direction. Since the outer axial surface of the push rod 312 is partially protruded to form two engaging portions 314, the distance between the line connecting the two engaging portions 314 on the end face is greater than the diameter of the end face of the push rod 312. When an angle is formed between the engaging portion 314 and the major axis of the slot 112b, the engaging portion 314 will restrict the push rod 312 from moving along the axial direction. In this embodiment, the angle is set to 90°, that is, the second part 112 is controlled to rotate 90° relative to the push rod 312, so that the locking teeth 3141 can fully abut against the end face of the second part 112, ensuring the stability of the locking action.

[0039] Based on the above embodiments, to ensure the stability of the push rod 312 switching between the latching state and the moving state, each latching tooth 3141 has a guide surface 3141a and a latching surface 3141b. The latching surface 3141b connects the guide surface 3141a and the next latching tooth 3141. The guide surface 3141a is inclined towards the handle 311, and the included angle between it and the latching surface 3141b is set to an obtuse angle. When the push rod 312 is in the latching state, the latching surface 3141b is constrained in the slot 112b by an interference fit. This causes friction to be generated on the snap-fit ​​surface 3141b due to the squeezing action of the side wall of the slot 112b, preventing the push rod 312 from becoming loose from the slot 112b and ensuring the stability of the push rod 312's position when it is in the snap-fit ​​state. When the push rod 312 switches from the snap-fit ​​state to the moving state, the guide surface 3141a and the side wall of the slot 112b are attached and slide together, forming a guiding effect on the movement of the push rod 312, preventing jamming or other phenomena when the second part 112 rotates, and ensuring the stability of the moving state.

[0040] Based on the above embodiment, due to the sealing effect between the sealing block 313 and the receiving cavity 21a, when the push rod 312 causes relative movement between the sealing block 313 and the receiving cavity 21a, the frictional force between the sealing block 313 and the inner wall of the receiving cavity 21a will be greater than the frictional force between the push rod 312 and the inner wall of the receiving cavity 21a. A limiting head 312a is provided by protruding one end of the push rod 312 towards the sealing block 313, and the end of the sealing block 313 towards the push rod 312 is recessed. A limiting groove 313a is formed that is adapted to the shape of the limiting head 312a. The limiting groove 313a fully covers the limiting head 312a, so that when the push rod 312 drives the sealing block 313 to move relative to the receiving cavity 21a to form a negative pressure, the sealing block 313 will not come out from the end of the push rod 312, ensuring the connection between the two, thereby ensuring that the local adsorption effect of the flared mouth 22a on the stone 01 and the snatching and tightening effect of the basket 32 ​​on the stone 01 can be realized.

[0041] like Figure 16 As shown, the present invention also provides a method for operating the above-mentioned bile duct stone retrieval basket 32 ​​device, comprising the following steps: The outer cannula 12, the inner cannula 22 confined within the outer cannula 12, and the basket 32 ​​confined within the inner cannula 22 are inserted into the bile duct through interventional means. When the location of stone 01 is reached, the basket 32 ​​is released from the inner tube 22 through the second power unit 31, forming a mesh structure that can accommodate stone 01. The inner sleeve 22 is driven by the first power unit 21 to move relative to the outer sleeve 12, so that the flared mouth 22a switches from the contracted state to the adsorption state. The second power unit 31 applies force to the basket 32 ​​again to retract the basket 32, so that a negative pressure is formed in the inner tube 22 and the receiving cavity 21a. During this process, the flared mouth 22a achieves a local adsorption effect on the stone 01, and the basket 32 ​​achieves a snag and tightening effect on the stone 01.

[0042] The specific process of the above working method has been described in detail in the above embodiments, and will not be repeated here.

[0043] Those skilled in the art should understand that this invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to this invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A bile duct stone retrieval basket device, characterized in that, Includes a housing, a suction assembly, and a detachment assembly; The housing includes a support portion and a rigid outer sleeve. The support portion has a through movable cavity along the axial direction, and the outer sleeve is fitted onto one end of the support portion. The suction assembly includes a first power unit and a soft inner sleeve. The first power unit is confined in the movable cavity and has a through receiving cavity along the axial direction. The inner sleeve is arranged in the same direction as the outer sleeve, sleeved on one end of the first power unit, and the inner sleeve extends out of the movable cavity and is located inside the tube of the outer sleeve. The retrieval assembly includes a second power unit and a basket. The second power unit is confined in the receiving cavity. One end of the basket is connected to the end of the second power unit and deforms when subjected to the action of the second power unit, thus confining it within the tube of the inner sleeve. The other end of the second power unit extends from the end of the support portion away from the outer sleeve for the user to apply force. The inner sleeve diverges from the end opposite to the first power unit to form a flared opening. The flared opening has a contracted state that is confined inside the outer sleeve and the outer sleeve wall abuts against the inner sleeve wall of the outer sleeve, and an adsorption state that extends outside the outer sleeve and the inner sleeve wall partially abuts against the stone. When the first power unit drives the inner sleeve to move relative to the outer sleeve, the flared opening completes the switching between the contracted state and the adsorption state. When the second power unit applies force to the basket and retracts the basket, a negative pressure is formed in the inner tube and the receiving cavity, so that the flared opening can achieve a local adsorption effect on the stone, while the basket can achieve a tightening effect on the stone.

2. The bile duct stone retrieval basket device according to claim 1, characterized in that, The support includes a first part and a second part that are detachably connected. The first part is provided with a sliding groove along the axial direction. The first power unit is partially confined in the sliding groove. After the first part and the second part are connected, the second part forms a limiting effect on the extreme position of the sliding groove.

3. The bile duct stone retrieval basket device according to claim 2, characterized in that, The first power unit includes a sliding sleeve, a coupling joint, and a moving block; The sliding sleeve is confined within the movable cavity, one end of which contracts to adapt to the shape of the mating head and is fixedly connected to the mating head. The moving block is fixed to the outer axial surface of the sliding sleeve, and the inner sleeve is fitted onto the mating head. The movable block is confined in the sliding groove and slidably connected to the sliding groove, with one end of the movable block extending into the sliding groove protruding from the outer axial surface of the first portion.

4. The bile duct stone retrieval basket device according to claim 3, characterized in that, The movable block is provided with a threaded structure on its exterior, and the first part is fitted with a threaded sleeve on its exterior. The threaded sleeve is connected to the movable block through the threaded structure.

5. The bile duct stone retrieval basket device according to claim 4, characterized in that, The outer shaft surfaces of the first and second portions have partial protrusions, forming a first abutting portion and a second abutting portion, respectively. After the first and second portions are connected, the first abutting portion and the second abutting portion abut against the two ends of the threaded sleeve, respectively.

6. The bile duct stone retrieval basket device according to claim 2, characterized in that, The second power unit includes a handle, a push rod, and a sealing block; One end of the push rod is confined within the receiving cavity and fixedly connected to the sealing block; the other end extends out of the outside of the support portion through the movable cavity and is fixedly connected to the handle; the end of the sealing block opposite to the push rod is fixedly connected to the basket, and the side wall of the sealing block abuts against and presses against the inner wall of the receiving cavity to form a sealing effect.

7. The bile duct stone retrieval basket device according to claim 6, characterized in that, The outer axial surface of the push rod has a partial protrusion, forming two engaging parts, which are symmetrically arranged about the axis of the push rod. Each of the engagement parts includes a plurality of continuous locking teeth, which are arranged sequentially along the outer axial surface of the push rod; The second portion is disposed through the end face opposite to the handle to form a slot. The slot is elliptical in shape. The minor axis of the slot is adapted to the diameter of the end face of the push rod, and the major axis of the slot is adapted to the distance between the two engaging portions on the end face. The push rod has a moving state and a locking state. When the push rod is in the moving state, both locking parts are located on the long axis of the slot. When the push rod is in the locking state, the locking parts form an angle with the long axis of the slot, and the locking teeth abut against the end face of the second part.

8. The bile duct stone retrieval basket device according to claim 7, characterized in that, Each of the aforementioned teeth has a guide surface and a snap-fit ​​surface, the snap-fit ​​surface connecting the guide surface and the next aforementioned tooth, the guide surface being inclined toward one end of the handle, and the angle between the guide surface and the snap-fit ​​surface being set to an obtuse angle; When the push rod is in the latching state, the latching surface is restricted in the slot by an interference fit. When the push rod switches from the latching state to the moving state, the guide surface is attached to and slides against the side wall of the slot, forming a guiding effect on the movement of the push rod.

9. The bile duct stone retrieval basket device according to claim 6, characterized in that, The push rod protrudes towards the sealing block at one end and is provided with a limiting head. The sealing block is recessed towards the push rod at one end, forming a limiting groove that adapts to the shape of the limiting head. The limiting groove provides full coverage of the limiting head.

10. A method of operating the bile duct stone retrieval basket device as described in claim 1, characterized in that, Includes the following steps: The outer cannula, the inner cannula confined within the outer cannula, and the basket confined within the inner cannula are inserted into the bile duct using interventional techniques. When the location of the stone is reached, the basket is released from the inner tube through the second power unit, forming a mesh structure that can accommodate the stone. The inner sleeve is driven by the first power unit to move relative to the outer sleeve, so that the flared mouth switches from a contracted state to an adsorption state. The second power unit applies force to the basket again to retract it, creating a negative pressure inside the inner tube and into the receiving cavity. During this process, the flared opening achieves a local adsorption effect on the stone, and the basket achieves a snug and tightening effect on the stone.

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