Mesh basket assembly and calculus removing mesh basket

Abstract

The mesh basket assembly comprises a pipe fitting, a guide piece and a plurality of mesh basket wires connected between the pipe fitting and the guide piece, the mesh basket wires can arch out in the direction away from the axis of the pipe fitting, a mesh basket body is formed on the periphery of the mesh basket wires, the guide piece is provided with a containing chamber, and the mesh basket assembly further comprises a deformation piece. The deformation pieces are bent according to a set route and contained in the containing chamber, the multiple deformation pieces are arranged in one-to-one correspondence with the multiple mesh basket wires, the near end portions of the multiple deformation pieces are fixedly connected to the far end portions of the corresponding mesh basket wires, and the far end portions of the multiple deformation pieces are fixedly connected to the guiding piece. According to the mesh basket assembly provided by the utility model, when a stone is too large to be clamped in the mesh basket and cannot be released, force can be applied to pull the mesh basket wire, so that the mesh basket wire drives the deformation part to be partially separated from the accommodating chamber, the axial length of the mesh basket body is increased, the mesh basket body can expand in the radial direction, and then the stone is released. The mesh basket assembly is simple in structure, convenient to operate, safe and reliable.

Description

Net basket components and stone retrieval net basket Technical Field

[0001] This utility model relates to the field of medical device technology, specifically to a basket assembly and a stone retrieval basket. Background Technology

[0002] Gallstones are a common biliary system disease in clinical practice, causing numerous discomforts and health risks to patients. In clinical treatment, stone retrieval baskets, as a commonly used stone removal instrument, play an important role.

[0003] In practical use, existing lithotripsy baskets are prone to the following problems: First, when the basket encounters a stone that is too large to pass through the papilla during stone retrieval, it is necessary to release the stone and replace the lithotripsy equipment. However, in this situation, the stone may become stuck in the basket due to its large size, preventing successful release. Second, even when the basket successfully retrieves the stone through the papilla and reaches the duodenum, preparing to release it through the intestines, the stone may still become stuck in the basket and fail to be released.

[0004] Both of these situations necessitate open surgery for gallstones, even though minimally invasive procedures could have resolved the problem. This not only causes significant physical harm to patients, increases the risk of postoperative complications such as infection, and prolongs recovery time, but also greatly complicates the work of doctors, affecting treatment efficiency and the patient's experience. Therefore, there is an urgent need for an improved solution that effectively addresses the problem of stones becoming stuck during stone retrieval using existing stone retrieval baskets, thereby enhancing the safety, effectiveness, and convenience of gallstone treatment. Summary of the Invention

[0005] The purpose of this invention is to provide a basket assembly and a stone retrieval basket that can easily release stones.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] This utility model provides a basket assembly for a stone retrieval basket, including a pipe, a guide, and basket wires connecting the two. The basket wires are multiple in number and can arch outwards from the axis away from the pipe to form a basket body. The guide has a receiving chamber. The basket assembly also includes deformable members that bend along a predetermined path and are housed within the receiving chamber. Multiple deformable members are arranged in a one-to-one correspondence with the multiple basket wires. The proximal ends of the multiple deformable members are fixedly connected to the distal ends of their corresponding basket wires, and the distal ends are fixedly connected to the guide. When the basket wire is subjected to force and moves away from the receiving chamber, the basket wire can pull the deformable members on it to partially detach from the receiving chamber, thereby extending the axial length of the basket body.

[0008] When a stone becomes stuck in the basket and cannot be released, force can be applied to pull the basket wires, causing the basket wires and the deformable part to detach from the receiving chamber. This increases the axial length of the basket body, allowing it to expand radially and release the stone.

[0009] Preferably, the deformable element is formed by bending an elongated body.

[0010] In some embodiments, the deformable element is formed by bending an elongated body in a spiral or wavy shape. The spiral or wavy shape allows for a greater stroke length within a smaller space.

[0011] Preferably, the deformable component is made of metal.

[0012] In some embodiments, the deformable component is made of stainless steel or nickel-titanium alloy.

[0013] Preferably, the deformable component is integrally formed or welded with its corresponding wire mesh.

[0014] Preferably, the guide includes a connecting portion and a barrier portion surrounding the connecting portion and forming the receiving chamber with the connecting portion. The connecting portion has a plurality of channels corresponding to the basket wire and allowing the basket wire or the deformable member to pass through. The diameter of the channels is smaller than the outer diameter of the deformable member.

[0015] More preferably, the guide further includes a blocking portion connected to the enclosure portion and forming a blockage, and the distal end of the deformable member is fixedly connected to the blocking portion.

[0016] Preferably, the basket wire has 3 to 5 strands.

[0017] Preferably, the basket wire is nickel-titanium wire or stainless steel rope.

[0018] This utility model also provides a stone retrieval basket, which includes the basket assembly described above.

[0019] Preferably, the stone-collecting basket further includes a pull rod, a handle slidably disposed on the pull rod along the axial direction, a three-way assembly connected to the pull rod, and a sheath connected to the three-way assembly. One end of the tubular part of the basket assembly passes through the sheath, the three-way assembly is fixedly connected to the handle and controlled by the handle, and the basket wire has an initial state of retracting into the sheath and a working state of extending out of the sheath.

[0020] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art:

[0021] The mesh basket assembly provided by this utility model can, when encountering a situation where a stone is too large and stuck in the mesh basket, apply force to pull the mesh basket wire, causing the mesh basket wire and the deformable part to detach from the receiving chamber. This increases the axial length of the mesh basket body, allowing it to expand radially and thus release the stone. This mesh basket assembly has a simple structure, is easy to operate, and is safe and reliable. Attached Figure Description

[0022] Figure 1 is a structural schematic diagram of the basket assembly provided in Embodiment 1 (not all fittings are shown);

[0023] Figure 2 is an enlarged schematic diagram of part A in Figure 1;

[0024] Figure 3 is a schematic diagram of the basket assembly provided in Embodiment 1 under stress and elongation;

[0025] Figure 4 is a schematic diagram of the basket assembly provided in Embodiment 1 under stress and elongation and expansion;

[0026] Figure 5 is a cross-sectional view of the guide provided in Embodiment 1;

[0027] Figure 6 is a top view of the guide provided in Embodiment 1;

[0028] Figure 7 is another structural schematic diagram of the basket assembly provided in Embodiment 1;

[0029] Figure 8 is a schematic diagram of the stone retrieval basket provided in Example 1;

[0030] The components are: 1. Basket assembly; 11. Pipe fitting; 111. First fixing pipe; 112. Second fixing pipe; 113. Cable; 114. Boosting pipe; 12. Basket wire; 13. Guide component; 131. Connecting part; 132. Enclosure part; 133. Sealing part; 134. Reception chamber; 135. Passage; 14. Deformable component; 141. Distal end of deformable component;

[0031] 2. Sheath; 3. Tee assembly; 4. Protective tube; 5. Pull rod; 6. Handle; 7. Stone. Detailed Implementation

[0032] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0033] In the description of the embodiments of this utility model, it should be understood that "distal end" refers to the end of the instrument or component away from the operator, and "proximal end" refers to the end of the instrument or component closer to the operator; "axial direction" refers to the direction parallel to the line connecting the centers of the distal and proximal ends of the instrument or component; "inner" and "outer" are positions defined by distance relative to the center of the instrument or component, where "inner" is the position closer to the center of the instrument or component, and "outer" is the position away from the center of the instrument or component; "upper" and "lower" refer to the orientation of the instrument in its actual use or working state. The above description of directional terms is only for the convenience of describing the embodiments of the present invention and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the embodiments of this utility model.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0035] In this embodiment of the invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0036] The foregoing disclosure provides many different implementations or examples for carrying out different structures of the embodiments of this utility model. To simplify the disclosure of the embodiments of this utility model, specific examples of components and arrangements are described above. Of course, these are merely examples and are not intended to limit the embodiments of this utility model. Furthermore, reference numerals and / or reference letters may be repeated in different examples of the embodiments of this utility model; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various implementations and / or arrangements discussed.

[0037] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings.

[0038] Example 1

[0039] A stone retrieval basket, as shown in Figure 8, includes a pull rod 5, a handle 6 slidably mounted on the pull rod 5 along its axial direction, a three-way assembly 3 connected to the distal end of the pull rod 5, a sheath 2 connected to the three-way assembly 3, and a basket assembly 1 movably disposed within the sheath 2. The basket assembly 1 includes a tube 11, a guide 13, and basket wires 12 connected between the two. The proximal end of the tube 11 is fixedly connected to the handle 6, which is configured to push and pull the tube 11 to give the basket wires 12 an initial state retracted within the sheath 2 (not shown in the figure) and a working state extended beyond the sheath 2 (as shown in Figure 8). Multiple basket wires 12 are present, and these multiple basket wires 12 can arch outwards away from the axis of the tube 11 to form a basket body. In this embodiment, there are four basket wires 12, which are nickel-titanium wires. In some other embodiments, the basket wires 12 can also be stainless steel ropes.

[0040] Referring to Figures 1 to 6, the guide 13 has a receiving chamber 134. Specifically, it includes a connecting portion 131, a blocking portion 132, and a sealing portion 133. The blocking portion 132 surrounds the connecting portion 131 and forms the receiving chamber 134 together with the connecting portion 131. The sealing portion 133 is connected to the blocking portion 132 and forms a seal. The connecting portion 131 has multiple channels 135 corresponding to the wire mesh 12 and allowing the wire mesh 12 to pass through. That is, in this embodiment, there are four channels 135. Preferably, the channels 135 are arranged in pairs side by side, and each wire mesh 12 extends into the receiving chamber 134 through its corresponding channel 135. Of course, in some other embodiments, the number of channels 135 may be greater than the number of wire mesh 12.

[0041] The basket assembly 1 also includes deformable elements 14, which have multiple deformable elements 14 corresponding one-to-one with multiple basket wires 12. That is, in this embodiment, there are four deformable elements 14. Taking one as an example, the deformable element 14 is bent along a predetermined route and housed in the receiving chamber 134. Its proximal end is fixedly connected to the distal end of its corresponding basket wire 12, specifically by welding or by integrally forming it with the corresponding basket wire 12. The distal end 141 of the deformable element is fixedly connected to the guide 13, specifically by welding. The outer diameter of the deformable element 14 is larger than the diameter of the channel 135 to prevent the deformable element 14 from being uncontrolled and exposed in the receiving chamber 134, thus affecting stone retrieval. When the stone 7 is stuck in the basket and cannot be released, operate the handle 6 to move the tube 11 with the basket wire 12 away from the receiving chamber 134 (towards the proximal end). Under the pulling force of the basket wire 12, the deforming part 14 is gradually pulled away from the receiving chamber 134, thereby extending the axial length of the basket body. As a result, the basket body can expand radially outward, thus releasing the stone 7.

[0042] Preferably, the deformable element 14 is formed by bending an elongated body, the diameter of which is less than or equal to the diameter of the channel 135, so that it can pass through the channel 135. Preferably, the deformable element 14 can be formed by bending the elongated body in a spiral or wavy shape. A spiral or wavy shape allows for a larger stroke length within a smaller space, facilitating the outward expansion of the basket while avoiding interference between them. The deformable element 14 is made of metal, such as stainless steel, nickel-titanium alloy, or other conventional materials in the art.

[0043] Referring to Figure 7, the fitting 11 includes a fixed tube, a cable 113, and a booster tube 114. The proximal ends of multiple basket wires 12 converge within the fixed tube and are fixed thereto. The fixing method includes, but is not limited to, riveting and extrusion. The fixed tube includes a first fixed tube 111 and a second fixed tube 112 arranged sequentially from far to near. The distal end of the cable 113 is fixedly connected to the second fixed tube 112, and the proximal end is fixedly connected to the booster tube 114. The booster tube 114 is fixedly connected to the handle 6, specifically by locking the booster tube 114 to the handle 6 using a screw. Operating the handle 6 allows the booster tube 114, cable 113, fixed tube, and basket assembly 1 to move synchronously.

[0044] The sheath 2, the three-way connector 3, the handle 6, and the pull rod 5 can refer to existing technologies. In this embodiment, the stone retrieval basket also includes a protective tube 4 sleeved at the connection between the sheath 2 and the three-way connector 3.

[0045] The working principle of the above-mentioned stone retrieval basket is:

[0046] In its initial state, the basket assembly 1 is retracted into the sheath 2.

[0047] During operation, pushing handle 6 towards the distal end causes the fitting 11 and basket assembly 1 to move synchronously, extending basket assembly 1 out of sheath tube 2. The basket wire 12 expands under its own shape-holding force to form a basket body, which then snares the stone 7. When the stone 7 is snareed, pulling handle 6 in the opposite direction causes fitting 11 to retract basket assembly 1, thereby removing the stone 7.

[0048] When a large stone 7 cannot pass through the nipple or be released, the tension applied to the handle 6 is increased, so that the deformable part 14 is gradually pulled away from the receiving chamber 134, thereby extending the axial length of the basket body and expanding the basket body radially outward to release the stone 7.

[0049] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A basket assembly for a stone retrieval basket, comprising a pipe (11), a guide (13), and basket wires (12) connected between the two, wherein the basket wires (12) are multiple, and the multiple basket wires (12) can arch outwards in a direction away from the axis of the pipe (11) to form a basket body on the periphery, characterized in that: The guide (13) has a receiving chamber (134), and the basket assembly (1) further includes a deformable member (14). The deformable member (14) is bent along a set route and housed in the receiving chamber (134). The deformable member (14) has multiple members that correspond one-to-one with multiple basket wires (12). The proximal ends of the multiple deformable members (14) are fixedly connected to the distal ends of their corresponding basket wires (12), and the distal ends are fixedly connected to the guide (13). When the basket wires (12) are subjected to force and move away from the receiving chamber (134), the basket wires (12) can pull the deformable members (14) on them to partially detach from the receiving chamber (134), so as to extend the axial length of the basket body.

2. The basket assembly of the stone retrieval basket according to claim 1, characterized in that: The deformable part (14) is formed by bending a slender body.

3. The basket assembly of the stone retrieval basket according to claim 2, characterized in that: The deformable part (14) is formed by bending an elongated body in a spiral or wavy shape.

4. The basket assembly of the stone retrieval basket according to claim 1, characterized in that: The deformable part (14) is made of metal.

5. The basket assembly of the stone retrieval basket according to claim 1, characterized in that: The deformable part (14) and its corresponding basket wire (12) are integrally formed or welded together.

6. The basket assembly of the stone retrieval basket according to claim 1, characterized in that: The guide (13) includes a connecting part (131) and a barrier part (132) surrounding the connecting part (131) and forming the receiving chamber (134) with the connecting part (131). The connecting part (131) has a plurality of channels (135) corresponding to the basket wire (12) and allowing the basket wire (12) or the deformable member (14) to pass through. The diameter of the channel (135) is smaller than the outer diameter of the deformable member (14).

7. The basket assembly of the stone retrieval basket according to claim 6, characterized in that: The guide (13) also includes a sealing part (133) connected to the enclosure part (132) and forming a blockage, and the distal end of the deformable part (14) is fixedly connected to the sealing part (133).

8. The basket assembly of the stone retrieval basket according to claim 1, characterized in that: The basket wire (12) has 3 to 5 strands; and / or, the basket wire (12) is nickel-titanium wire or stainless steel rope.

9. A stone-collecting basket, characterized in that: Includes the basket assembly as described in any one of claims 1 to 8.

10. The stone-collecting basket according to claim 9, characterized in that: The stone retrieval basket also includes a pull rod (5), a handle (6) slidably mounted on the pull rod (5) along the axial direction, a three-way assembly (3) connected to the pull rod (5), and a sheath (2) connected to the three-way assembly (3). One end of the tube (11) of the basket assembly (1) passes through the sheath (2). The three-way assembly (3) is fixedly connected to the handle (6) and controlled by the handle (6). The basket wire (12) has an initial state of retracting into the sheath (2) and a working state of extending out of the sheath (2).

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