A type of gravel basket

Abstract

This utility model relates to a lithotripsy basket, including an outer tube, a push-pull assembly, a basket, and a handle. The lithotripsy basket also includes a sealing member disposed on the basket. The sealing member has a winding structure that is wound from the inside out and has elastic deformation capability. The sealing member is configured such that under the action of external force, its winding structure elastically deforms and moves axially to retract into the outer tube, and is configured such that after the external force is removed, its winding structure unfolds to form a blockage at the distal end of the basket, preventing lithotripsy from passing through. By providing a sealing member, the winding structure of the sealing member can elastically deform and retract into the outer tube, facilitating its entry into the target location within the body; simultaneously, when it extends out of the outer tube, it forms a blockage at the distal end of the basket, preventing small stones formed during lithotripsy from scattering to distant locations, facilitating subsequent stone removal, and preventing lithotripsy from entering other parts of the body and causing complications.

Description

Technical Field

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

[0002] In the clinical treatment of bile duct stones, doctors typically use instruments such as stone retrieval baskets and balloon retrieval devices to remove the stones. However, when faced with larger stones, doctors need to perform lithotripsy first, breaking the large stones into smaller fragments before removing them one by one. During this process, the smaller fragments often scatter over distances, causing considerable inconvenience to subsequent stone removal procedures and significantly prolonging the operation time. More seriously, there is always a risk that the fragments may enter the hepatic ducts. If this occurs, it can lead to blockage, inflammation, or even rupture of the hepatic ducts, resulting in a series of serious complications and posing a significant threat to the patient's health. Utility Model Content

[0003] The purpose of this invention is to provide a gravel basket with a sealing function.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] This utility model provides a gravel-crushing basket, including an outer tube, a push-pull assembly passing through the outer tube, a basket connected to the distal end of the push-pull assembly, and a handle connected to the proximal end of the push-pull assembly. The handle is configured to drive the push-pull assembly to extend or retract the basket into the outer tube under the action of an external force. The gravel-crushing basket also includes a sealing member disposed on the basket. The sealing member has a winding structure that is wound from the inside out. The winding structure has elastic deformation capability. The sealing member is configured to elastically deform its winding structure and move axially towards the outer tube under the action of an external force, so as to retract into the outer tube. It is also configured to unfold its winding structure after the external force is removed to form a blockage and prevent gravel from passing through.

[0006] Existing lithotripsy baskets cannot avoid the inconvenience and risks caused by stone fragment scattering during mechanical lithotripsy. This application addresses this issue by cleverly designing a occlusion element with an elastic deformation capability in its coiled structure. When the instrument enters the target location within the body, the occlusion element retracts inside the outer tube, ensuring the instrument passes smoothly through narrow channels. When the occlusion element extends from the outer tube, its coiled structure unfolds at the distal end of the basket, forming an effective seal that prevents small stones formed during lithotripsy from scattering further away, thus preventing stone fragments from entering other vital areas (such as the common hepatic duct) and significantly reducing the risk of complications. It also facilitates subsequent stone retrieval procedures and improves surgical efficiency.

[0007] In some embodiments, the spiral structure is spirally wound from the inside out. The spirally wound structure can increase the contact area with the stone, better form a seal, and can adaptively adjust according to the shape and diameter of the target stone location, ensuring a good sealing effect for different patients.

[0008] In some specific embodiments, the winding structure includes multiple spiral unit coils connected in sequence, the diameter of the multiple spiral unit coils gradually increasing from the inside to the outside, and the winding structure forming a spiral tower shape.

[0009] Furthermore, two adjacent spiral unit coils are in contact with each other or have a gap between them.

[0010] In some embodiments, the starting end of the winding structure is closer to the basket than its ending end, and the ending end of the winding structure is a free end.

[0011] In some embodiments, the winding structure starts from a starting end and is continuously wound in the same direction to its end.

[0012] In some embodiments, the wound structure is formed from metal wire through a heat treatment and shaping process. The heat treatment and shaping process is based on existing technology in the art and is not limited thereto.

[0013] In some specific embodiments, the winding structure is made of nickel-titanium alloy.

[0014] In some embodiments, the sealing element further includes a connecting portion, one end of which is connected to a connecting pipe at the far end of the basket, and the other end of which is connected to the starting end of the winding structure.

[0015] In some embodiments, the connecting portion and the winding structure are integrally formed.

[0016] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art:

[0017] This application incorporates a sealing component whose coiled structure can elastically deform and contract within the outer tube, facilitating entry into the target location within the body. Simultaneously, when extending from the outer tube, it forms a blockage at the distal end of the basket, preventing small stones formed during lithotripsy from scattering to distant locations, thus facilitating subsequent stone removal and preventing stones from entering other parts of the body and causing complications. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the mesh basket and sealing wire provided in Example 1;

[0019] Figure 2 This is a schematic diagram of the structure of the crushed stone basket provided in Example 1, wherein the basket and the sealing element both extend outside the outer tube;

[0020] Figure 3 This is a schematic diagram of the structure of the distal end of the crushed stone basket provided in Example 1, wherein the basket is retracted inside the outer tube and the sealing element extends outside the outer tube;

[0021] Figure 4 This is a schematic diagram of the structure of the distal end of the gravel basket provided in Example 1, wherein the basket and the sealing element are simultaneously retracted into the outer tube;

[0022] Figure 5 This is a schematic diagram of the structure of the distal end of the stone crushing basket provided in Example 1, after stone removal and before stone crushing.

[0023] Figure 6 This is a schematic diagram of the structure of the distal end of the crushed stone basket provided in Example 1 after crushing the stone;

[0024] Figure 7 This is a schematic diagram of the distal end of the lithotripsy basket provided in Example 1 during the process of lithotripsy and removal from the common bile duct;

[0025] The components include: 1. Sealing element; 11. Winding structure; 111. Spiral unit coil; 112. Starting end; 113. End; 12. Connecting part; 2. Net basket; 21. Net basket wire; 22. Distal fixing tube; 23. Proximal fixing tube; 3. Outer tube; 4. Push-pull assembly; 5. Handle; 51. Pull rod; 52. Operating part; 53. T-joint assembly;

[0026] A. Duodenum; A1. Duodenal papilla; B. Common bile duct; C. Common hepatic duct; D. Hepatic cystic duct; E. Stone. Detailed Implementation

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings.

[0033] Example 1

[0034] A type of gravel basket, such as Figure 2 As shown, it includes an outer tube 3, a push-pull assembly 4 passing through the outer tube 3, a basket 2 connected to the far end of the push-pull assembly 4, and a handle 5 connected to the near end of the push-pull assembly 4. The handle 5 is configured to drive the push-pull assembly 4 to extend or retract the basket 2 into the outer tube 3 under the action of external force. The gravel basket also includes a sealing member 1 provided on the basket 2. The sealing member 1 has a winding structure 11 that is wound from the inside out. The winding structure 11 has elastic deformation capability. The sealing member 1 is configured to elastically deform its winding structure 11 and move towards the axial direction under the action of external force so as to retract into the outer tube 3. It is also configured to unfold its winding structure 11 after the external force is removed to form a blockage to prevent gravel from passing through.

[0035] When faced with a large kidney stone E, the basket 2 is opened to enclose the large stone E, and then the handle 5 is operated to control the basket 2 to retract, applying mechanical pressure to the stone E and causing it to break. The broken small stones E are prone to scattering far away, which is not conducive to stone removal and poses a risk of entering other parts of the body. By setting a sealing component 1, which forms an open winding structure 11 at the far end of the basket 2, a blockage is formed at the far end, which can prevent small stones E from passing through and prevent small fragments from scattering far away and entering other parts of the body or causing inconvenience to stone removal.

[0036] like Figures 1 to 7 As shown, the spiral structure 11 is spirally wound from the inside out. The spirally wound structure 11 increases the contact area with the stone E, resulting in better blockage. Furthermore, it can adaptively adjust according to the shape and diameter of the target stone location, ensuring good blockage in different patients. The spiral structure 11 is formed from metal wire through a heat treatment shaping process, which is a conventional process in the art. Preferably, the metal wire is a nickel-titanium alloy wire with good flexibility and shape memory.

[0037] Specifically, the winding structure 11 includes multiple sequentially connected spiral unit coils 111. The diameter of the spiral unit coils 111 gradually increases from the inside out, making the winding structure 11 resemble a spiral tower. The number of spiral unit coils 111 is at least two, and can be specifically designed according to the diameter of the target stone-collecting location, ensuring that small stones cannot pass through. For example, the number of spiral unit coils 111 can be 4 to 6. Two adjacent spiral unit coils 111 are in contact with each other or have a gap. When there is a gap, the gap should not be too large to prevent small stones from passing through; preferably, the gap should not be larger than the diameter of the metal wire. More specifically, the starting end 112 of the winding structure 11 is closer to the basket 2 than its ending end 113, and the ending end 113 of the winding structure 11 is a free end. Furthermore, the winding structure 11 starts from the starting end 112 and continuously winds in the same direction to its ending end 113. This arrangement facilitates the retraction of the winding structure 11 into the outer tube 3.

[0038] The sealing component 1 also includes a connecting portion 12, one end of which is connected to the distal fixing tube 22 at the distal end of the basket 2, and the other end is connected to the starting end 112 of the winding structure 11. Preferably, the connecting portion 12 is a straight structure extending axially, so that when the sealing component 1 is subjected to external force, it guides the winding structure 11 to undergo elastic deformation and retract into the outer tube 3. In this embodiment, the connecting portion 12 and the winding structure 11 are integrally formed.

[0039] The basket 2, outer tube 3, push-pull assembly 4, and handle 5 can refer to existing technology. As one example, the basket 2 includes multiple basket wires 21, a distal fixing tube 22, and a proximal fixing tube 23. The distal ends of the multiple basket wires 21 converge at the distal fixing tube 22 and are fixed thereto, while the proximal ends converge at the proximal fixing tube 23 and are fixed thereto. The middle portion arches outward to form the basket body. The connecting portion 12 of the sealing member 1 is riveted and fixed to the distal fixing tube 22. The handle 5 includes a pull rod 51, an operating portion 52 slidably disposed on the pull rod 51, and a three-way assembly 53. The proximal end of the three-way assembly 53 is connected to the distal end of the pull rod 51, and the distal end is connected to the outer tube 3. The push-pull assembly 4 includes a pull cable connected to the proximal fixing tube 23 and the operating portion 52.

[0040] Working principle:

[0041] In its initial state, the basket 2 and the sealing element 1 of the gravel mesh basket are retracted into the outer tube 3 (see...). Figure 4 During operation, the distal end of the stone-collecting basket is inserted into the target stone-collecting position (such as the common bile duct B), and the operating part 52 of the handle 5 is pushed, which drives the push-pull assembly 4 to move the basket 2 and the sealing component 1 gradually to the distal end.

[0042] As the sealing component 1 is pushed out of the outer tube 3, under its own elastic force, it spirals around the distal end of the stone E from the outside in, that is, it gradually spirals from the outside in starting from the end 113, forming a spiral structure 11, until the sealing component 1 is completely pushed out of the outer tube 3 (see...). Figure 3 Afterwards, the basket 2 is pushed out of the outer tube 3, and under its own elasticity, the basket 2 expands and forms the basket 2 body.

[0043] Next, remove stone E (see Figure 5 When a large stone E cannot pass through the duodenal papilla A1, the operating handle 5 controls the basket 2 to contract, applying mechanical pressure to the stone E to break it up. Due to the obstruction of the winding structure 11, the broken fragments will not fly far away and enter the common hepatic duct C or the hepatic cystic duct D (see...). Figure 6 ).

[0044] Subsequently, operate handle 5. This causes the drive push-pull assembly 4 to move the basket 2 and the sealing component 1 gradually towards the proximal end. Under the pressure of the outer tube 3, the basket 2 contracts and carries some small stones into the outer tube 3 (see...). Figure 7 The remaining stones can be swept out of the bile duct and discharged into the duodenum A through the winding structure 11.

[0045] Finally, continue operating handle 5. Under the pressure of the outer tube 3, the spiral unit coils 111 on the winding structure 11 undergo elastic deformation from the inside out and move towards the axial direction. That is, starting from the starting end 112, they gradually deform from the inside out. The winding structure 11 is eventually straightened or nearly straightened and retracts into the outer tube 3. Remove the stone-retrieving basket 2 to complete the stone crushing and retrieval operation.

[0046] 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 gravel-crushing basket, comprising an outer tube (3), a push-pull assembly (4) passing through the outer tube (3), a basket (2) connected to the distal end of the push-pull assembly (4), and a handle (5) connected to the proximal end of the push-pull assembly (4), wherein the handle (5) is configured to drive the push-pull assembly (4) to extend or retract the basket (2) within the outer tube (3) under the action of an external force, characterized in that: The gravel basket also includes a sealing member (1) disposed on the basket (2), the sealing member (1) having a winding structure (11) that is wound from the inside out, the winding structure (11) having elastic deformation capability. The sealing element (1) is configured such that, under the action of an external force, its winding structure (11) undergoes elastic deformation and moves toward the axial direction to retract into the outer tube (3), and is configured such that, after the external force is removed, its winding structure (11) unfolds to form a blockage at the far end of the basket (2) to prevent the passage of gravel.

2. The crushed stone basket according to claim 1, characterized in that: The winding structure (11) is spirally wound from the inside out.

3. The crushed stone basket according to claim 2, characterized in that: The winding structure (11) includes multiple spiral unit coils (111) connected in sequence. The diameter of the multiple spiral unit coils (111) gradually increases from the inside to the outside, making the winding structure (11) resemble a spiral tower.

4. The crushed stone basket according to claim 3, characterized in that: Two adjacent spiral unit coils (111) are in contact with each other or have a gap.

5. The crushed stone basket according to claim 1, characterized in that: The starting end (112) of the winding structure (11) is closer to the basket (2) than its ending end (113), and the ending end (113) of the winding structure (11) is a free end.

6. The crushed stone basket according to claim 1, characterized in that: The winding structure (11) starts from the starting end (112) and is continuously wound in the same direction to its end (113).

7. The gravel basket according to any one of claims 1 to 6, characterized in that: The winding structure (11) is formed by heat treatment and shaping of metal wire.

8. The crushed stone basket according to claim 1, characterized in that: The winding structure (11) is made of nickel-titanium alloy.

9. The gravel basket according to claim 1, characterized in that: The sealing component (1) also includes a connecting part (12), one end of which is connected to the connecting pipe at the far end of the basket (2), and the other end is connected to the starting end (112) of the winding structure (11).

10. The gravel basket according to claim 9, characterized in that: The connecting part (12) and the winding structure (11) are integrally formed.

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