Occlusion basket
By designing an adjustable inner and outer basket structure, the problem of non-adjustable basket holes in existing ureteral occluders is solved, achieving a balance between stone blockage and smooth water flow, and reducing the difficulty of ureteroscopic lithotripsy.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- 威高奋威健康科技发展(上海)有限公司
- Filing Date
- 2023-06-27
- Publication Date
- 2026-06-16
AI Technical Summary
The basket opening size of existing ureteral occluders is not adjustable, which can cause stones to escape into the renal pelvis or enter the renal calyx, increasing the difficulty of the operation. Alternatively, if the basket opening is too small, it may hinder the flow of water.
Design a sealing basket, including an inner basket and an outer basket, with adjustable basket openings via a controller. The inner and outer baskets can switch between extended and retracted states to ensure effective sealing of stones and unobstructed water flow.
While ensuring that the stones do not escape, it improves the flow of water, reduces the difficulty of the surgery, and enhances the operability of the surgery.
Smart Images
Figure CN116672024B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of medical device technology, and more particularly to a sealing basket. Background Technology
[0002] Ureteral stones are a common disease in urology. Ureteroscopic lithotripsy uses a thin endoscope (approximately 3mm in diameter) inserted through the urethra and bladder into the ureter to break up and remove ureteral or kidney stones. During lithotripsy, a continuous flow of water is required, which can easily cause stones and fragments in the middle and upper ureter to be flushed back into the renal pelvis or calyces by the water flow or the recoil force of the lithotripsy device, increasing the difficulty of the surgery and potentially leading to failure. Blocking the area above the ureteral stone with a device is an important way to prevent the stone from flowing back into the kidney. Currently, some ureteral occlusion devices are available clinically; however, these devices still have certain shortcomings in practical use.
[0003] Previous patent CN201621413091.2 disclosed a ureteral occlusion device, including an occlusion element insertion kit with an insertion catheter and a top wire; an occlusion element having a central column and an olive-shaped basket structure with the central column as its axis, the basket structure being composed of several shape memory alloy filaments, one end of the central column being formed with a barb; and an occlusion element extractor, the top of which has a collar that engages with the barb at one end of the central column. The basket opening in the above solution is not adjustable. If the designed basket opening is larger than the size of the broken stone, it can escape through the basket into the renal pelvis or renal calyces, increasing the difficulty of the surgery and leading to surgical failure. If the designed basket opening is too small, although it can prevent the broken stone from escaping into the renal pelvis or renal calyces, it is not conducive to the passage of fluid. Summary of the Invention
[0004] The purpose of this invention is to provide a blocking basket to solve the problem in related technologies where the size of the basket opening is not adjustable. If the designed basket opening is larger than the size of the broken stone, it can escape into the renal pelvis or renal calyx through the basket, increasing the difficulty of the operation and leading to surgical failure. If the designed basket opening is too small, although it can prevent the broken stone from escaping into the renal pelvis or renal calyx, it is also not conducive to the passage of water.
[0005] This invention provides a sealing basket, the sealing basket comprising:
[0006] A basket structure includes an inner basket and an outer basket sleeved outside the inner basket, wherein the inner basket and the outer basket are arranged coaxially.
[0007] The controller includes a first control element and a second control element, the first control element being configured to allow the inner mesh basket to have two states: relative rotation and relative fixation relative to the outer mesh basket about the axis of the inner mesh basket, and the second control element being configured to switch the inner mesh basket and the outer mesh basket between an unfolded state and a retracted state.
[0008] As a preferred technical solution for sealing the mesh basket, the first control component includes a first tube and a second tube passing through the first tube. One end of the first tube is coaxially fixed to one end of the outer mesh basket along the axis of the outer mesh basket, and one end of the second tube extends into the outer mesh basket and is coaxially fixed to one end of the inner mesh basket along the axis of the inner mesh basket.
[0009] As a preferred technical solution for blocking the net basket, the net basket structure is woven from memory material, and when the net basket structure is not subjected to external force, the inner net basket and the outer net basket are in the unfolded state.
[0010] As a preferred technical solution for sealing the mesh basket, the second control component includes a third tube, which is slidable along the axial direction of the first tube. One end of the third tube extends into the outer mesh basket and is coaxially fixed to the other end of the inner mesh basket along the axis of the inner mesh basket.
[0011] As a preferred technical solution for blocking the net basket, the second control component further includes a fourth tube, which is inserted into the third tube along the axis of the third tube, and one end of the fourth tube is coaxially fixed to the other end of the outer net basket along the axis of the outer net basket.
[0012] As a preferred technical solution for blocking the net basket, the third tube is inserted into the second tube.
[0013] As a preferred technical solution for blocking the net basket, the third pipe and the second pipe are provided with a groove on one side and a sliding pin on the other side along their axial direction, and the sliding pin is slidably disposed in the groove.
[0014] As a preferred technical solution for blocking the net basket, it also includes a storage tube, which is sleeved on the first tube. When the outer net basket is in the closed state, the outer net basket can extend into the storage tube.
[0015] As a preferred technical solution for blocking the net basket, it also includes a handle, the handle including a body, the body having an insertion hole along its axial direction, the side wall of the body having a first groove communicating with the insertion hole along its circumference, and the side wall of the body having a second groove communicating with the insertion hole along its axial direction.
[0016] The handle also includes a first operating part and a second operating part. The controller part is inserted into the socket. The other end of the first tube is fixedly connected to the body. The other end of the second tube is fixedly connected to the first operating part that is slidably disposed in the first slot. The other end of the fourth tube is fixedly connected to the second operating part that is slidably disposed in the second slot. The other end of the third tube abuts against the second operating part along the axial direction of the third tube.
[0017] As a preferred technical solution for sealing mesh baskets, the surface of the inner mesh basket, or the surface of the inner mesh basket opposite to the outer mesh basket, or the surface of the outer mesh basket opposite to the inner mesh basket, is covered with a friction-reducing coating.
[0018] As a preferred technical solution for the blocking net basket, the distance between the inner net basket and the outer net basket is 'a', and the value of 'a' ranges from 0.2mm to 0.8mm.
[0019] As a preferred technical solution for the sealing basket, the inner basket includes a plurality of first mesh openings, and the outer basket includes a plurality of second mesh openings, with the plurality of first mesh openings and the plurality of second mesh openings corresponding one-to-one.
[0020] The beneficial effects of this invention are as follows:
[0021] The present invention provides a sealing basket, which includes a basket structure and a controller. The basket structure includes an inner basket and an outer basket sleeved on the outside of the inner basket, and the inner and outer baskets are arranged coaxially. The controller includes a first control element and a second control element. The first control element is configured to allow the inner basket to have two states: relative rotation and relative fixation relative to the outer basket about the axis of the inner basket. The second control element is configured to switch the inner and outer baskets between an unfolded state and a retracted state. When this sealing device is used in ureteral stone surgery, the basket structure in its retracted state is first placed behind the location of the stone in the ureter. Then, the second control unit controls the inner and outer baskets to switch from the retracted state to the extended state simultaneously. At this time, the first control unit is adjusted to make the basket opening formed by the inner and outer baskets as large as possible. This facilitates the passage of water and also makes it easier to see the situation behind the sealing basket. After adjusting the position of the sealing basket, the second control unit is adjusted until the basket structure abuts against the wall of the ureter. Subsequently, the first control component is adjusted to maximize the size of the basket opening formed by the inner and outer mesh baskets, ensuring that the broken stones cannot pass through. The laser lithotripsy technology then breaks up the stones. Under the influence of the water flow, the broken stones move towards the renal pelvis or calyces. The basket opening formed by the inner and outer mesh baskets not only prevents the broken stones from passing through the sealing baskets but also ensures water flow. Furthermore, the dense mesh wires ensure that if individual mesh wires are accidentally broken during holmium laser lithotripsy, it will not affect the overall sealing effect. This design effectively prevents the broken stones from passing through while improving water flow. Attached Figure Description
[0022] Figure 1 This is a schematic diagram of the sealing basket structure in an embodiment of the present invention (excluding the receiving tube);
[0023] Figure 2 This is a schematic diagram of the structure of the inner and outer mesh baskets before they rotate relative to each other in an embodiment of the present invention;
[0024] Figure 3 This is a schematic diagram of the structure of the inner and outer mesh baskets after relative rotation in an embodiment of the present invention;
[0025] Figure 4 This is a schematic diagram of one end of the basket structure in an embodiment of the present invention;
[0026] Figure 5 This is a schematic diagram of the structure at the other end of the basket structure in an embodiment of the present invention;
[0027] Figure 6 This is a cross-sectional view of the sealing basket in an embodiment of the present invention (the basket structure is in a folded state);
[0028] Figure 7 for Figure 4 A magnified view of a section at point A in the middle;
[0029] Figure 8 for Figure 4 A magnified view of a section at point B in the middle;
[0030] Figure 9 This is a schematic diagram of the handle structure in an embodiment of the present invention;
[0031] Figure 10 This is a schematic diagram of the sealing basket in an embodiment of the present invention (excluding the storage tube and handle).
[0032] In the picture:
[0033] 1. Basket structure; 11. Inner basket; 12. Outer basket;
[0034] 21. First control component; 211. First pipe; 212. Second pipe; 22. Second control component; 221. Third pipe; 222. Fourth pipe;
[0035] 31. Main body; 311. First slot; 312. Second slot; 32. First operating unit; 33. Second operating unit;
[0036] 4. Storage tube. Detailed Implementation
[0037] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0038] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions. Furthermore, "above," "on top of," and "over" the first feature in relation to the second feature includes the first feature directly above and diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "under," and "below" the first feature in relation to the second feature includes the first feature directly below and diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0039] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.
[0040] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.
[0041] like Figures 1-10As shown, this embodiment provides a sealing basket, which includes a basket structure 1 and a controller. The basket structure 1 includes an inner basket 11 and an outer basket 12 sleeved on the outside of the inner basket 11. The inner basket 11 and the outer basket 12 are arranged coaxially. The controller includes a first control element 21 and a second control element 22. The first control element 21 is configured to allow the inner basket 11 to have two states: relative rotation and relative fixation relative to the outer basket 12 about the axis of the inner basket 11. The second control element 22 is configured to switch the inner basket 11 and the outer basket 12 between an unfolded state and a retracted state. When this sealing device is used in ureteral stone surgery, the basket structure 1, which is in the retracted state, is first placed behind the location of the stone in the ureter. Then, the second control component 22 controls the inner basket 11 and the outer basket 12 to simultaneously switch from the retracted state to the extended state. At this time, the first control component 21 is adjusted to make the basket opening formed by the inner basket 11 and the outer basket 12 as large as possible. This facilitates the passage of water and allows for a clear view of the situation behind the sealing basket, making it easier to move and determine the position of the basket. After adjusting the position of the sealing basket, the second control component 22 is adjusted until the basket structure 1 abuts against the wall of the ureter. Subsequently, the first control component 21 is adjusted to maximize the size of the basket opening formed by the inner and outer mesh baskets 11 and 12, ensuring that the broken stones cannot pass through. The laser lithotripsy technology breaks the stones, and the water flow propels the broken stones towards the renal pelvis or calyces. The basket opening formed by the inner and outer mesh baskets 11 and 12 not only prevents the broken stones from passing through the sealing baskets but also ensures water flow. Furthermore, the dense mesh wires ensure that even if individual wires are accidentally broken during holmium laser lithotripsy, the overall sealing effect will not be affected. This design improves water flow while preventing the broken stones from passing through.
[0042] Optionally, the second control element 22 is configured to switch the inner net basket 11 and the outer net basket 12 between an extended state and a retracted state. For example, the second control element 22 can drive the inner net basket 11 and the outer net basket 12 to simultaneously switch from an extended state to a retracted state.
[0043] Optionally, the inner mesh basket 11 includes a plurality of first mesh openings, and the outer mesh basket 12 includes a plurality of second mesh openings, with each of the first and second mesh openings corresponding one-to-one. In this embodiment, the first and second mesh openings have the same shape. In other embodiments, the first and second mesh openings may have different shapes.
[0044] like Figures 2 to 3 As shown, it illustrates the positional changes of the inner basket 11 and the outer basket 12 before and after relative rotation. For example, before the first control member 21 controls the inner basket 11 to rotate relative to the outer basket 12, as... Figure 2 As shown, the wires of the inner mesh basket 11 and the outer mesh basket 12 are opposite each other, and the first mesh opening of the inner mesh basket 11 and the second mesh opening of the outer mesh basket 12 correspond one-to-one and are opposite each other; after the first control member 21 controls the inner mesh basket 11 to rotate relative to the outer mesh basket 12, the inner mesh basket 11 rotates relative to the outer mesh basket 12 by a preset angle α, and then the inner mesh basket 11 is fixed relative to the outer mesh basket 12. At this time, the inner mesh basket 11 and the outer mesh basket 12 are in a relatively fixed state. Figure 3 As shown, the wires of the inner basket 11 and the outer basket 12 are not opposite each other. At this time, the wires of the inner basket 11 and the outer basket 12 together form a basket hole, and the area of the basket hole is smaller than the area of the first mesh hole of the inner basket 11 or the second mesh hole of the outer basket 12.
[0045] The area of the basket opening can be adjusted by changing the preset angle α of the rotation of the inner basket 11 relative to the outer basket 12. Specifically, α can be 10 degrees, 15 degrees, or 20 degrees, etc.
[0046] Optionally, the first control element 21 includes a first tube 211 and a second tube 212 passing through the first tube 211. One end of the first tube 211 is coaxially fixed to one end of the outer mesh basket 12 along its axis, and one end of the second tube 212 extends into the outer mesh basket 12 and is coaxially fixed to one end of the inner mesh basket 11 along its axis. In this embodiment, by rotating the second tube 212, the second tube 212 rotates relative to the first tube 211, thereby enabling the inner mesh basket 11 to rotate relative to the outer mesh basket 12 around a pivot. Because the friction between the first tube 211 and the second tube 212 is large, when the force applied to the second tube 212 is removed, the first tube 211 and the second tube 212 remain relatively stationary under the action of friction, thus the inner mesh basket 11 and the outer mesh basket 12 are in a relatively fixed state.
[0047] Specifically, one end of the inner net basket 11 and one end of the outer net basket 12 are both proximal ends, that is, the ends closer to the operator, while the other ends of the inner net basket 11 and the outer net basket 12 are both distal ends, that is, the ends farther away from the operator.
[0048] When the third drive tube 221 moves the inner basket 11 from the proximal end to the distal end, the inner basket 11 and the outer basket 12 switch from the unfolded state to the folded state.
[0049] Optionally, the basket structure 1 is woven from memory material. When the basket structure 1 is not subjected to external force, the inner basket 11 and the outer basket 12 are in an unfolded state. The second control component 22 includes a third tube 221, which can slide along the axial direction of the first tube 211. One end of the third tube 221 extends into the outer basket 12 and is coaxially fixed to the other end of the inner basket 11 along its axis. In this embodiment, both the inner basket 11 and the outer basket 12 are woven from memory material, and both are in an unfolded state when not subjected to external force. One end of the third tube 221 extends into the outer mesh basket 12 and is coaxially fixed to the other end of the inner mesh basket 11 along the axis of rotation. Since the outer mesh basket 12 is sleeved on the outside of the inner mesh basket 11, when the third tube 221 drives the inner mesh basket 11 to switch from the unfolded state to the retracted state, the inner mesh basket 11 will drive the outer mesh basket 12 to switch from the unfolded state to the retracted state. When the inner mesh basket 11 switches from the retracted state to the unfolded state, since the outer mesh basket 12 is woven from memory material, the outer mesh basket 12 automatically switches from the retracted state to the unfolded state. Specifically, in this embodiment, the memory material is a nickel-titanium alloy wire; in other embodiments, it can also be a wire made of polymer memory material.
[0050] Optionally, the second control element 22 further includes a fourth tube 222, which is inserted into the third tube 221 along its axis. One end of the fourth tube 222 is coaxially fixed to the other end of the outer mesh basket 12 along its axis. In this embodiment, by simultaneously driving the fourth tube 222 and the third tube 221 to slide, the inner mesh basket 11 and the outer mesh basket 12 can be synchronously switched between a closed state and an extended state.
[0051] In other embodiments, the basket structure 1 is not woven from memory material. When the third tube 221 is driven to move the inner basket 11 from the proximal end to the distal end, the inner basket 11 and the outer basket 12 switch from an unfolded state to a folded state. When the fourth tube 222 is driven to move the outer basket 12 from the distal end to the proximal end, the inner basket 11 and the outer basket 12 switch from a folded state to an unfolded state.
[0052] In other embodiments, the portion of the third tube 221 connected to the inner mesh basket 11 and the portion of the fourth tube 222 connected to the outer mesh basket 12 are rotatably connected around the third tube 221, meaning they can only rotate and not move axially. For example, the length of the third tube 221 can be shortened, retaining only a shorter section connecting the distal end of the third tube 221 to the inner mesh basket 11. This third tube 221 is rotatably sleeved with the fourth tube 222, and a limiting protrusion structure is fixedly provided at the front and rear of the outer side of the fourth tube 222. The limiting protrusion structure restricts the axial movement of the third tube 221 in the front and rear of the fourth tube 222. The structure of the fourth tube 222 remains unchanged, and by controlling the fourth tube 222, the synchronous axial movement of the inner mesh basket 11 and the outer mesh basket 12 can be achieved.
[0053] Optionally, the third tube 221 is inserted into the second tube 212. In this embodiment, since the space in the ureter itself is very small, this arrangement can save space.
[0054] Optionally, along the axial direction of the third tube 221 and the second tube 212, one of the third tube 221 and the second tube 212 is provided with a groove, and the other is provided with a sliding pin, which is slidably disposed in the groove. In this embodiment, the above arrangement can ensure that the second tube 212 and the third tube 221 can slide relative to each other along the axis of the third tube 221. On the other hand, the above arrangement only requires rotating one of the second tube 212 and the third tube 221 to achieve synchronous rotation of the second tube 212 and the third tube 221, thereby enabling both ends of the inner mesh basket 11 to actively rotate around the axis of rotation, preventing different rotation angles at both ends of the inner mesh basket 11, which would lead to twisting of the inner mesh basket 11.
[0055] Optionally, the occlusion basket also includes a receiving tube 4, which is sleeved on the first tube 211. When the outer basket 12 is in the retracted state, the outer basket 12 can extend into the receiving tube 4. In this embodiment, during the process of inserting the occlusion basket into the urinary catheter, the basket structure 1 needs to be housed in the receiving tube 4. When both the inner basket 11 and the outer basket 12 are in the retracted state, the receiving tube 4 can be driven, thereby housing the basket structure 1 inside the receiving tube 4.
[0056] Optionally, the sealing basket further includes a handle, which includes a body 31. The body 31 has an insertion hole along its axial direction, and a first groove 311 communicating with the insertion hole is provided on the side wall of the body 31 along its circumference. A second groove 312 communicating with the insertion hole is provided on the side wall of the body 31 along its axial direction. The handle also includes a first operating part 32 and a second operating part 33. The controller part is inserted into the insertion hole. The first tube 211 is fixedly connected to the body 31, the second tube 212 is fixedly connected to the first operating part 32 slidably disposed in the first groove 311, and the fourth tube 222 is fixedly connected to the second operating part 33 slidably disposed in the second groove 312. In this embodiment, the first operating part 32 slides in the first groove 311, driving the second tube 212 to rotate around its axis, thereby driving the inner mesh basket 11 to rotate relative to the outer mesh basket 12 around the pivot. When the second operating unit 33 slides within the second groove 312, the fourth tube 222 slides along its axis, thereby switching the outer mesh basket 12 between a retracted state and an extended state. When the outer mesh basket 12 switches from an extended state to a retracted state, the second operating unit 33 drives the third tube 221 to slide axially, thereby switching the inner mesh basket 11 from an extended state to a retracted state. Specifically, the shape of the first groove 311 is determined according to the shape of the body 31. When the body 31 is cylindrical, the first groove 311 is a fan-shaped groove with the same diameter as the body 31. When the body 31 is rectangular, the first groove 311 is a triangular groove. For the second groove 312, regardless of the shape of the body 31, the second groove 312 is a rectangular groove arranged along the axial direction of the insertion hole.
[0057] Optionally, the surface of the inner mesh basket 11, or the surface of the inner mesh basket 11 opposite to the outer mesh basket 12, or the surface of the outer mesh basket 12 opposite to the inner mesh basket 11, is coated with an anti-friction coating. In this embodiment, since the inner mesh basket 11 and the outer mesh basket 12 will experience relative friction when the inner mesh basket 11 rotates relative to the outer mesh basket 12 around the axis of rotation, an anti-friction coating is provided between the inner mesh basket 11 and the outer mesh basket 12 to reduce the friction between them. In other embodiments, the anti-friction coating may also be applied to the outer mesh basket 12, or both the inner mesh basket 11 and the outer mesh basket 12 may be coated with an anti-friction coating.
[0058] In other embodiments, the inner basket 11 may optionally be polished or surface-treated with hydrogel, acrylic polymer and photocurable hydrophilic coating or organic adhesive hydrophilic coating to form an anti-sticking, highly lubricating, biosafe and stable hydrophilic coating between the inner basket 11 and the outer basket 12, thereby reducing the friction between the inner basket 11 and the outer basket 12 when they move relative to each other.
[0059] Optionally, the distance between the inner mesh basket 11 and the outer mesh basket 12 is 'a', where 'a' ranges from 0.2mm to 0.8mm. In this embodiment, if the distance between the inner mesh basket 11 and the outer mesh basket 12 is too large, the broken stones can easily pass through the gap between them. If the distance is too small, the friction between them increases, hindering their relative rotation. Therefore, through extensive testing, this embodiment controls the distance 'a' between the inner mesh basket 11 and the outer mesh basket 12 to be between 0.2mm and 0.8mm. Specifically, 'a' can be one of 0.2mm, 0.3mm, 0.4mm, 0.45mm, 0.5mm, 0.55mm, 0.6mm, 0.7mm, and 0.8mm.
[0060] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.
Claims
1. A method for blocking a net basket, characterized in that, include: The basket structure (1) includes an inner basket (11) and an outer basket (12) sleeved on the outside of the inner basket (11). The inner basket (11) and the outer basket (12) are arranged coaxially. The inner basket (11) includes a plurality of first mesh holes, and the outer basket (12) includes a plurality of second mesh holes. The plurality of first mesh holes and the plurality of second mesh holes correspond one-to-one. When the inner basket (11) rotates relative to the outer basket (12), the first mesh holes and the second mesh holes intersect to form basket holes. The area of the basket holes is smaller than the area of the first mesh hole of the inner basket (11) or the area of the second mesh hole of the outer basket (12). The controller includes a first control element (21) and a second control element (22), the first control element (21) being configured to allow the inner mesh basket (11) to have two states: rotating and fixed relative to the outer mesh basket (12) about the axis of the inner mesh basket (11), the basket opening being used to prevent ureteral stone fragments from passing through while ensuring the flow of water; The second control (22) is configured to switch the inner mesh basket (11) and the outer mesh basket (12) between an extended state and a retracted state; The inner mesh basket (11) and the outer mesh basket (12) opposite to each other or the outer mesh basket (12) and the inner mesh basket (11) opposite to each other are covered with a friction-reducing coating; the distance between the inner mesh basket (11) and the outer mesh basket (12) is a, and the value of a ranges from 0.2mm to 0.8mm.
2. The sealing basket according to claim 1, characterized in that, The first control element (21) includes a first tube (211) and a second tube (212) passing through the first tube (211). One end of the first tube (211) is coaxially fixed to one end of the outer mesh basket (12) along the axis of the outer mesh basket (12). One end of the second tube (212) extends into the outer mesh basket (12) and is coaxially fixed to one end of the inner mesh basket (11) along the axis of the inner mesh basket (11).
3. The sealing basket according to claim 2, characterized in that, The basket structure (1) is woven from memory material. When the basket structure (1) is not subjected to external force, the inner basket (11) and the outer basket (12) are in the unfolded state.
4. The sealing basket according to claim 2 or 3, characterized in that, The second control element (22) includes a third tube (221) which is slidable along the axial direction of the first tube (211). One end of the third tube (221) extends into the outer mesh basket (12) and is coaxially fixed to the other end of the inner mesh basket (11) along the axis of the inner mesh basket (11).
5. The sealing basket according to claim 4, characterized in that, The second control component (22) further includes a fourth tube (222), which is inserted into the third tube (221) along the axis of the third tube (221), and one end of the fourth tube (222) is coaxially fixed to the other end of the outer mesh basket (12) along the axis of the outer mesh basket (12).
6. The sealing basket according to claim 5, characterized in that, The third tube (221) is inserted into the second tube (212).
7. The sealing basket according to claim 6, characterized in that, The third tube (221) and the second tube (212) are provided with a groove on one of them along their axial direction and a sliding pin on the other, with the sliding pin slidably disposed in the groove.
8. The sealing basket according to claim 3, characterized in that, It also includes a storage tube (4), which is sleeved on the first tube (211). When the outer mesh basket (12) is in the closed state, the outer mesh basket (12) can extend into the storage tube (4).
9. The sealing basket according to claim 5, characterized in that, It also includes a handle, the handle including a body (31), the body (31) having an insertion hole along its axial direction, the side wall of the body (31) having a first groove (311) communicating with the insertion hole along its circumference, and the side wall of the body (31) having a second groove (312) communicating with the insertion hole along its axial direction. The handle also includes a first operating part (32) and a second operating part (33). The controller part is inserted into the socket. The other end of the first tube (211) is fixed to the body (31). The other end of the second tube (212) is fixed to the first operating part (32) which is slidably disposed in the first groove (311). The other end of the fourth tube (222) is fixed to the second operating part (33) which is slidably disposed in the second groove (312). The other end of the third tube (221) abuts against the second operating part (33) along the axial direction of the third tube (221).