Basket retrieval device

Abstract

This utility model belongs to the field of medical device technology and discloses a basket stone retrieval device, including a handle assembly, a spindle assembly, a guide tube assembly, a basket assembly, a core wire, and an elastic element. The spindle assembly is slidably connected to the handle assembly. One end of the elastic element is fixedly connected to the spindle assembly, and the other end is fixedly connected to the guide tube assembly. One end of the core wire is fixedly connected to the handle assembly, and the other end of the core wire slidably passes through the spindle assembly, the elastic element, and the guide tube assembly to connect to the basket assembly. Since the elastic element itself has the strength to resist torsional deformation, fixing both ends of the elastic element to the guide tube assembly and the spindle assembly respectively can be used to resist the torsional force generated when the guide tube assembly is coiled. This prevents the two ends of the basket wire from rotating relative to each other when the guide tube assembly rotates after coiling, thereby avoiding the problem of the basket wire of the basket assembly becoming kinked, which would prevent the basket assembly from being opened normally.

Description

Technical Field

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

[0002] Kidney stones are a common urinary system disease. Metabolic abnormalities, urinary tract obstruction, infection, foreign bodies, and medication use are common causes of stone formation. Ureteroscopic lithotripsy is an effective treatment for kidney stones or upper ureteral stones. It allows for precise stone removal through the body's natural passageways, without surgery, reducing patient discomfort. The instrument used in this procedure is a basket stone retrieval device.

[0003] For example, patent CN117338374A discloses a basket stone retrieval device. By pulling the mandrel assembly to open the basket assembly, and then retrieving the stone, pushing the mandrel assembly closes the basket assembly, thus securing the stone for removal. To ensure a firm grip while avoiding excessive force that could deform or damage the basket and impair its function, this patented device incorporates an elastic element between the guide tube assembly and the mandrel assembly. However, during use, because the outer sheath is relatively long and the distance it travels into the body is also considerable, the outer sheath needs to be coiled before the wire is gradually inserted. During coiling and insertion, the outer sheath and the core wire are prone to relative rotation, causing the basket wires within the basket assembly to become tangled, preventing the basket assembly from opening properly.

[0004] Therefore, there is an urgent need to design a basket stone retrieval device to solve the above-mentioned problems in the existing technology. Utility Model Content

[0005] The purpose of this invention is to provide a net basket stone retrieval device that solves the problem that the net basket assembly cannot be opened normally due to the kinking of the net basket wires during the coiling process.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] This utility model provides a net basket stone retrieval device, which includes a handle assembly, a spindle assembly, a guide tube assembly, a net basket assembly, a core wire, and an elastic element. The spindle assembly is slidably connected to the handle assembly along the axial direction. One end of the elastic element is fixedly connected to the spindle assembly, and the other end of the elastic element is fixedly connected to the guide tube assembly. One end of the core wire is fixedly connected to the handle assembly, and the other end of the core wire slidably passes through the spindle assembly, the elastic element, and the guide tube assembly and connects to the net basket assembly.

[0008] The basket assembly includes multiple guide tubes and basket wires corresponding to each guide tube. One end of each guide tube is connected to the guide tube assembly. One end of each basket wire can slide through the corresponding guide tube and be connected to the core wire. The other end is fixedly connected to the adjacent guide tube or passes through the adjacent guide tube and is fixedly connected to the guide tube assembly.

[0009] Optionally, the two ends of the elastic element are respectively snapped into the mandrel assembly and the guide tube assembly via a snap-fit ​​structure;

[0010] Alternatively, the two ends of the elastic element are bonded to the mandrel assembly and the guide tube assembly respectively by adhesive;

[0011] Alternatively, the two ends of the elastic element are magnetically connected to the mandrel assembly and the guide tube assembly, respectively, via magnetic components.

[0012] Optionally, the basket stone retrieval device further includes a reinforcing wire sheath, which can selectively cover the outside of different areas of the core wire.

[0013] Optionally, the elastic element is a compressible spring, sheet, or elastic column, and the elastic coefficient of the elastic element is K, satisfying K≥0.05.

[0014] Optionally, the elastic coefficient K of the elastic element satisfies K≥0.3.

[0015] Optionally, the mandrel assembly includes a mandrel body, on which a first groove is formed and a through hole is formed axially through the mandrel body and communicating with the first groove. The handle assembly includes a handle sleeve and a gripper slider, the gripper slider being slidably connected to the first groove. One end of the mandrel wire is fixedly connected to the gripper slider, and the other end of the mandrel wire passes through the through hole. The handle sleeve is slidably fitted onto the mandrel body and connected to the gripper slider.

[0016] Optionally, the gripper slider includes a connecting block, a first gripper, and a second gripper. The first gripper and the second gripper are connected to the connecting block at intervals. A clamping protrusion is provided on one side of the first gripper and the second gripper that are opposite to each other, and the core wire is clamped between the two clamping protrusions.

[0017] Optionally, the first gripper and the second gripper are provided with a plugging protrusion on their opposite sides, and the handle slide is provided with a plugging through hole corresponding to the plugging protrusion, and the plugging protrusion is inserted into the plugging through hole.

[0018] Optionally, the mandrel assembly further includes a protective sleeve threaded to the mandrel body to form a receiving chamber for accommodating the elastic element.

[0019] Optionally, the guide tube assembly includes a reinforcing tube and an outer sheath tube. The reinforcing tube is connected to the mandrel assembly, and a portion of the outer sheath tube is inserted and fixed inside the reinforcing tube. The portion of the outer sheath tube extending out of the reinforcing tube is connected to the basket assembly.

[0020] Optionally, the guide tube includes an outer tube and an inner tube, the end of the basket wire is connected to the core wire, the head end of the basket wire passes through the inner tube and then enters the outer tube of the adjacent guide tube, and the head end of the basket wire is fixedly connected to the outer tube or passes through the outer tube and is fixedly connected to the outer sheath tube.

[0021] The beneficial effects of this utility model are:

[0022] This invention provides a basket stone retrieval device, which includes a handle assembly, a spindle assembly, a guide tube assembly, a basket assembly, a core wire, and an elastic element. Since the elastic element itself has the strength to resist torsional deformation, one end of the elastic element is fixedly connected to the guide tube assembly, and the other end is fixedly connected to the spindle assembly. This utilizes the elastic element to resist the torsional force that causes the guide tube assembly to rotate when coiled. Because one end of the basket wire is connected to the core wire, and the core wire is fixed by the handle assembly connected to the spindle assembly, and the other end of the basket wire is fixedly connected to the guide tube assembly or a guide tube connected to the guide tube assembly, when the elastic element prevents the guide tube assembly from rotating after coiling, the two ends of the basket wire will not rotate relative to each other. This avoids the problem of the basket wire in the basket assembly becoming kinked, preventing the basket assembly from being opened normally. Attached Figure Description

[0023] Figure 1 This is a structural assembly diagram of the basket stone retrieval device according to Embodiment 1 of this utility model;

[0024] Figure 2 This is a schematic diagram of the connection structure between the core shaft body and the outer sheath tube via an elastic element in the first embodiment of the stone retrieval device provided by this utility model, viewed from a first perspective.

[0025] Figure 3 This is a schematic diagram of the connection structure between the core shaft body and the outer sheath tube through an elastic element in the first embodiment of the stone retrieval device provided by this utility model, viewed from a second perspective.

[0026] Figure 4 This is a diagram illustrating the connection structure between the handle assembly and the spindle body in the first embodiment of the stone-retrieving device provided by this utility model.

[0027] Figure 5 This is a diagram illustrating the connection structure between the handle slide and the gripper slider in the first embodiment of the stone-retrieving device provided by this utility model.

[0028] Figure 6 This is a diagram illustrating the connection structure between the mandrel body and the gripper slider in Embodiment 1 of the stone-retrieving device provided by this utility model.

[0029] Figure 7 This is a schematic diagram of the handle sliding sleeve in the net basket stone retrieval device provided in Embodiment 1 of this utility model;

[0030] Figure 8 This is a schematic diagram of the connection between the gripper slider and the core wire in the stone retrieval device of Embodiment 1 provided by this utility model;

[0031] Figure 9 This is a schematic diagram of the connection between the basket assembly and the outer sheath in the basket stone retrieval device provided by this utility model;

[0032] Figure 10 This is a diagram showing the internal structure of the net basket assembly in the net basket stone retrieval device provided by this utility model;

[0033] Figure 11 This is a structural assembly diagram of the basket stone retrieval device according to Embodiment 2 of this utility model;

[0034] Figure 12 This is a schematic diagram of the connection structure between the core shaft body and the outer sheath tube via an elastic element in the second embodiment of the stone retrieval device provided by this utility model, viewed from a first perspective.

[0035] Figure 13 This utility model provides a schematic diagram of the connection structure between the core shaft body and the outer sheath tube via an elastic element in the second embodiment of the basket stone retrieval device.

[0036] Figure 14 This is a structural cross-sectional view of the basket stone retrieval device provided in Embodiment 2 of this utility model.

[0037] In the picture:

[0038] 1. Handle assembly; 11. Handle slide sleeve; 111. Insertion through hole; 112. Slide sleeve body; 113. Grip ring; 12. Grip slider; 121. Connecting block; 122. First gripper; 123. Second gripper; 124. Clamping protrusion; 125. Insertion protrusion; 13. Outer tube; 131. Second slide groove; 14. Grip part; 15. Clamping component; 16. Locking component;

[0039] 2. Mandrel assembly; 21. Mandrel body; 211. First slide groove; 212. Push-pull part; 22. Protective sleeve;

[0040] 3. Guide tube assembly; 31. Reinforcing tube; 311. Fixing part; 32. Outer sheath tube;

[0041] 4. Basket assembly; 41. Guide tube; 411. Outer tube; 412. Inner tube; 42. Basket wire;

[0042] 5. Core wire;

[0043] 6. Elastic components;

[0044] 7. Reinforced thread sleeve. Detailed Implementation

[0045] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0046] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0047] In this 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.

[0048] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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 this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0049] Kidney stones are a common urinary system disease. Metabolic abnormalities, urinary tract obstruction, infection, foreign bodies, and medication use are common causes of stone formation. Ureteroscopic lithotripsy is an effective treatment for kidney stones or upper ureteral stones. It uses the body's natural passageways for precise, visualized stone removal, eliminating the need for surgery and reducing patient discomfort. The procedure involves first using a holmium laser under flexible ureteroscopy to fragment the stones, then removing as many fragmented stones as possible using a basket retrieval device.

[0050] For example, patent CN117338374A discloses a basket stone retrieval device. By pulling a handle assembly connected to the mandrel assembly, the basket assembly opens to retrieve the stone. After the stone is retrieved, pushing the handle assembly closes the basket assembly, securing the stone for removal. However, to ensure a firm grip while avoiding excessive force that could deform or damage the basket and impair its function, this patent includes an elastic element between the guide tube assembly and the mandrel assembly. However, this elastic element is not actually connected to either assembly; it is simply a standalone component. The guide tube assembly and the mandrel assembly are in contact, so relative torsion can occur between them. The guide tube assembly includes an outer sheath connected to the head end of the basket wire. When the outer sheath is coiled, due to the bending-torsion coupling effect, the free end of the outer sheath rotates 360° with each coil. Therefore, the head end of the basket wire will rotate with the outer sheath. However, the end of the basket wire is connected to the mandrel wire, which is clamped by the handle assembly connected to the mandrel assembly and is in a fixed state, so the end of the basket wire cannot rotate. Therefore, the head end and the end end of the basket wire will be relatively displaced, causing the basket wire to twist, making it impossible to open the basket assembly normally.

[0051] Therefore, in order to solve the problem that the basket assembly cannot be opened normally due to the kinking of the basket wires during the coiling process, this embodiment provides a basket stone retrieval device.

[0052] Example 1

[0053] like Figures 1 to 10 As shown, the net basket stone retrieval device includes a handle assembly 1, a spindle assembly 2, a guide tube assembly 3, a net basket assembly 4, a core wire 5, and an elastic element 6. The spindle assembly 2 is slidably connected to the handle assembly 1 along the axial direction. One end of the elastic element 6 is fixedly connected to the spindle assembly 2, and the other end of the elastic element 6 is fixedly connected to the guide tube assembly 3. One end of the core wire 5 is fixedly connected to the handle assembly 1, and the other end of the core wire 5 slidably passes through the spindle assembly 2, the elastic element 6, and the guide tube assembly 3 and is connected to the net basket assembly 4.

[0054] The basket assembly 4 includes multiple guide tubes 41 and basket wires 42 corresponding to each guide tube 41. One end of each guide tube 41 is connected to the guide tube assembly 3. One end of each basket wire 42 can slide through the corresponding guide tube 41 and be connected to the core wire 5. The other end is fixedly connected to the adjacent guide tube 41 or passes through the adjacent guide tube 41 and is fixedly connected to the guide tube assembly 3.

[0055] The basket stone retrieval device includes a handle assembly 1, a spindle assembly 2, a guide tube assembly 3, a basket assembly 4, a core wire 5, and an elastic element 6. Since the elastic element 6 itself has the strength to resist torsional deformation, one end of the elastic element 6 is fixedly connected to the guide tube assembly 3, and the other end is fixedly connected to the spindle assembly 2. This allows the elastic element 6 to resist the torsional force that causes the guide tube assembly 3 to rotate when it is coiled. One end of the basket wire 42 is connected to the core wire 5, and the core wire 5 is fixed by the handle assembly 1 connected to the spindle assembly 2. The other end of the basket wire 42 is fixedly connected to the guide tube assembly 3 or the guide tube 41 connected to the guide tube assembly 3. Therefore, when the elastic element 6 prevents the guide tube assembly 3 from rotating after coiling, the two ends of the basket wire 42 will not rotate relative to each other, thus avoiding the problem of the basket wire 42 of the basket assembly 4 becoming kinked, which would prevent the basket assembly 4 from opening properly.

[0056] It should be noted that even if the torsional force causing the guide tube assembly 3 to rotate is large when the guide tube assembly 3 is coiled, causing the elastic element 6 to deform slightly and thus causing the guide tube assembly 3 to rotate slightly, as long as it does not exceed the elastic deformation limit of the elastic element 6, when the coiled part of the guide tube assembly 3 is released, the elastic element 6 will drive the guide tube assembly 3 to return to its normal shape, thereby solving the problem that the basket assembly 4 cannot be opened normally.

[0057] In this basket stone retrieval device, since the handle assembly 1 is connected to the core wire 5, and the core shaft assembly 2 is connected to the guide tube assembly 3 via the elastic element 6, when the handle assembly 1 and the core shaft assembly 2 slide relative to each other along the axial direction of the core shaft assembly 2, the core wire 5 and the guide tube assembly 3 also slide relative to each other. During this process, the basket assembly 4 connected to the core wire 5 partially extends into and out of the guide tube assembly 3. When the basket assembly 4 partially extends out of the guide tube assembly 3, the basket assembly 4 switches to an open state to retrieve the stone; when the basket assembly 4 partially extends into the guide tube assembly 3, the basket assembly 4 switches to a closed state to gather the retrieved stone inside the basket assembly 4. After the basket assembly 4 retrieves the stone, the handle assembly 1 and the core shaft assembly 2 continue to slide relative to each other, so that the basket assembly 4 gradually closes and grips the stone inside. It should be noted that the basket assembly 4 must be in the closed state when entering and exiting the human body.

[0058] Specifically, the two ends of the elastic element 6 are respectively snapped into the spindle assembly 2 and the guide tube assembly 3 via a snap-fit ​​structure. The snap-fit ​​structure enables the two ends of the elastic element 6 to be snapped into the spindle assembly 2 and the guide tube assembly 3, thereby making the elastic element 6 detachably connected to the spindle assembly 2 and the guide tube assembly 3, so that elastic elements 6 with different elastic coefficients can be replaced as needed.

[0059] When the elastic element 6 is fixedly connected to the spindle assembly 2 and the guide tube assembly 3 using a snap-fit ​​structure, the two ends of the elastic element 6 are provided with mounting heads for fixed connection. The mounting heads are provided with first pin holes. The spindle assembly 2 and the guide tube assembly are provided with mounting holes for insertion into the mounting heads and second pin holes that penetrate the mounting holes. When the mounting head is inserted into the mounting hole, the first pin hole and the second pin hole are aligned. Then, a stop pin is inserted, thereby achieving the connection function and preventing relative rotation between the mounting head and the mounting through hole.

[0060] Specifically, the two ends of the elastic element 6 are bonded to the spindle assembly 2 and the guide tube assembly 3 respectively using adhesive. This bonding method ensures that the two ends of the elastic element 6 are connected to the spindle assembly 2 and the guide tube assembly 3 in a non-detachable manner, guaranteeing the connection strength after connection. In this embodiment, the elastic element 6 is a spring, and the adhesive is hot melt adhesive.

[0061] Specifically, the two ends of the elastic element 6 are magnetically connected to the spindle assembly 2 and the guide tube assembly 3 respectively via magnetic components. The magnetic connection between the two ends of the elastic element 6 and the spindle assembly 2 and the guide tube assembly 3 allows for a detachable connection between the elastic element 6 and the spindle assembly 2 and the guide tube assembly 3, enabling the replacement of elastic elements 6 with different elastic coefficients as needed.

[0062] When the elastic element 6 is fixedly connected to the spindle assembly 2 and the guide tube assembly 3 using a magnetic component, both ends of the elastic element 6 are provided with magnetic mounting heads that are fixedly connected. The spindle assembly 2 and the guide tube assembly are both provided with mounting holes for inserting the mounting heads. After the mounting head is inserted into the mounting hole, the magnetism attracts the mounting head into the mounting hole, thereby achieving the connection function and preventing the mounting head from rotating relative to the mounting through hole.

[0063] Optionally, such as Figure 8 As shown, the basket stone retrieval device also includes a reinforcing wire sleeve 7, which can be selectively wrapped around the outside of different areas of the core wire 5. By wrapping the outside of different areas of the core wire 5 with the reinforcing wire sleeve 7, the strength of the core wire 5 is enhanced and deformation is prevented. On the one hand, this improves the firmness and stability of the basket assembly 4 in grasping the core wire, and on the other hand, it improves the core wire 5's ability to resist deformation.

[0064] In this embodiment, the basket wire 42 is made of nickel-titanium, and the core wire 5 in the handle assembly 1 is made of stainless steel. The basket wire 42 and the core wire 5 are connected together by welding or other means. The reinforcing wire sleeve 7 can be made by rolling a thin metal plate into a cylindrical tube. The reinforcing wire sleeve 7 wraps around the core wire 5 to enhance the support of the core wire 5.

[0065] Optionally, the elastic element 6 is a compressible spring, sheet, or elastic column, and the elastic coefficient of the elastic element 6 is K, satisfying K≥0.05. By limiting the elastic coefficient of the elastic element 6 to ensure that its elastic coefficient K satisfies K≥0.05, the elastic element 6 is guaranteed to have sufficient torsional strength, and deformation is avoided as much as possible when the elastic element 6 is used to resist the torsional force generated by the coiled guide tube assembly 3.

[0066] Among them, the elastic coefficient K of the elastic element 6 can be any value greater than or equal to 0.05, such as 0.05, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, etc.

[0067] More preferably, the elastic coefficient K of the elastic element 6 satisfies K≥0.3. By further limiting the range of the elastic coefficient K of the elastic element 6, the elastic coefficient K is avoided from being too small, resulting in insufficient strength to resist torsion. Therefore, by further limiting the elastic coefficient K of the elastic element 6, the torsional resistance performance of the elastic element 6 is optimized in a targeted manner.

[0068] Optionally, such as Figures 4 to 6 As shown, the spindle assembly 2 includes a spindle body 21, on which a first groove 211 and a through hole extending axially through the spindle body 21 and communicating with the first groove 211 are provided. The handle assembly 1 includes a handle sleeve 11 and a gripper slider 12. The gripper slider 12 is slidably connected to the first groove 211. One end of the core wire 5 is fixedly connected to the gripper slider 12, and the other end of the core wire 5 passes through the through hole. The handle sleeve 11 is slidably fitted onto the spindle body 21 and connected to the gripper slider 12. By fixing one end of the core wire 5 to the gripper slider 12 and slidably fitting the handle sleeve 11 connected to the gripper slider 12 onto the spindle body 21, when the handle sleeve 11 is slidably controlled, the core wire 5 can be controlled to open and close the basket assembly 4 connected to the core wire 5.

[0069] Optionally, such as Figure 8As shown, the gripper slider 12 includes a connecting block 121, a first gripper 122, and a second gripper 123. The first gripper 122 and the second gripper 123 are connected to the connecting block 121 at intervals. Clamping protrusions 124 are provided on opposite sides of the first gripper 122 and the second gripper 123, and the core wire 5 is clamped between the two clamping protrusions 124. By providing clamping protrusions 124 on the first gripper 122 and the second gripper 123 of the gripper slider 12, the core wire 5 is clamped onto the gripper slider 12, allowing the core wire 5 to slide as the gripper slider 12 slides.

[0070] In this embodiment, both the first jaw 122 and the second jaw 123 in the gripper slider 12 have a certain degree of elasticity. The distance between the clamping protrusions 124 on the first jaw 122 and the second jaw 123 is less than the diameter of the core wire 5. Therefore, when it is necessary to clamp the core wire 5, the first jaw 122 or the second jaw 123 needs to be pried open to increase the distance between the clamping protrusions 124, so that the core wire 5 can be placed between the two clamping protrusions 124. After placement, the first jaw 122 or the second jaw 123 is released, and the core wire 5 is clamped and fixed under its own elastic force. The connecting block 121, the first jaw 122, and the second jaw 123 are manufactured using an integral molding process.

[0071] In order to improve the support force for the core wire 5, a reinforcing sleeve 7 covering the outside of the core wire 5 is set at the end of the core wire 5 that is clamped by the gripper slider 12. At this time, one end of the reinforcing sleeve 7 abuts against the clamping protrusion 124, and the other end of the reinforcing sleeve 7 abuts against the connecting block 121. Thus, when the gripper slider 12 is pushed and pulled to move the core wire 5, the reinforcing sleeve 7 can provide support force in different directions. It works together with the clamping protrusion 124 to prevent relative sliding between the core wire 5 and the gripper slider 12. At this time, the length of the reinforcing sleeve 7 is equal to the distance between the clamping protrusion 124 and the connecting block 121.

[0072] Optionally, such as Figure 7 , Figure 8 As shown, the first gripper 122 and the second gripper 123 have insertion protrusions 125 on opposite sides. The handle slide 11 has insertion through holes 111 corresponding to the insertion protrusions 125, and the insertion protrusions 125 are inserted into the insertion through holes 111. By providing insertion protrusions 125 on the first gripper 122 and the second gripper 123, and providing insertion through holes 111 on the handle slide 11, the handle slide 11 is connected to the gripper slider 12, so that the gripper slider 12 can move together when the handle slide 11 is slidable.

[0073] In this embodiment, the handle slide 11 also includes a slide body 112 and a grip ring 113, wherein the grip ring 113 is two ring structures disposed on the slide body 112.

[0074] When assembling the handle sleeve 11, the gripper slider 12, and the spindle body 21, the gripper slider 12 is first placed in the first groove 211 of the spindle body 21. At this time, the connecting block 121, the first gripper 122, and the third gripper 123 of the gripper slider 12 are all located in the first groove 211, but the insertion protrusion 125 on the gripper slider 12 extends out of the first groove 211. Then, the handle sleeve 11 is fitted onto the spindle body 21 and slid to the gripper slider 12. At this time, the insertion protrusion 125 of the gripper slider 12 located outside the first groove 211 enters the interior of the handle sleeve 11 and is inserted into the insertion through hole 111 on the handle sleeve 11, thereby completing the assembly and connection of the handle sleeve 11, the gripper slider 12, and the spindle body 21.

[0075] Optionally, such as Figure 1 As shown, the spindle assembly 2 also includes a protective sleeve 22, which is threadedly connected to the spindle body 21 to form a receiving chamber for accommodating the elastic element 6. By providing the protective sleeve 22 on the outside of the spindle body 21, a receiving chamber for accommodating the elastic element 6 is formed. The protective sleeve 22 protects the elastic element 6, and the anti-slip sleeve and the spindle body 21 are connected by a threaded connection, which facilitates the connection and disassembly of the two, so as to quickly replace the elastic element 6 with different elastic coefficients.

[0076] Optionally, such as Figure 1 As shown, the guide tube assembly 3 includes a reinforcing tube 31 and an outer sheath 32. The reinforcing tube 31 is connected to the mandrel assembly 2, and a portion of the outer sheath 32 is inserted and fixed inside the reinforcing tube 31. The portion of the outer sheath 32 extending out of the reinforcing tube 31 is connected to the basket assembly 4. The outer sheath 32 is suitable for entering the body's natural cavities, and its length is sufficient to reach the lesion through these cavities. The reinforcing tube 31 is fitted onto the end of the outer sheath 32 near the mandrel assembly 2 to prevent bending or breakage during its engagement with the mandrel assembly 2. The outer sheath 32 and the basket assembly 4 enter the body to grasp stones, while the reinforcing tube 31 remains outside the body and does not enter. Optionally, the reinforcing tube 31 and the outer sheath 32 can be fixedly connected using various methods such as heat shrinking, bonding, welding, or compression.

[0077] The number of guide tubes 41 and basket wires 42 on the basket assembly 4 used for stone retrieval can be freely set according to needs. In this embodiment, four guide tubes 41 and four basket wires 42 are provided. One end of each guide tube 41 is connected to the guide tube assembly 3. One end (defined as the movable end) of each basket wire 42 can slide through the corresponding guide tube 41 and be connected to the core wire 5. The other end is fixed to the clockwise adjacent guide tube 41 or passes through the clockwise adjacent guide tube 41 to be fixed to the outer sheath 32 of the guide tube assembly 3; or, the other end of each basket wire 42 is fixed to the counterclockwise adjacent guide tube 41 or passes through the counterclockwise adjacent guide tube 41 to be fixed to the outer sheath 32 of the guide tube assembly 3. That is, two basket wires 42 are inserted into each guide tube 41, one fixed and the other can slide relative to the guide tube 41.

[0078] Optionally, such as Figure 10 As shown, the guide tube 41 includes an outer tube 411 and an inner tube 412. The end of the basket wire 42 is connected to the core wire 5. The head of the basket wire 42 passes through the inner tube 412 and then enters the outer tube 411 of the adjacent guide tube 41. The head of the basket wire 42 is fixedly connected to the outer tube 411 or passes through the outer tube 411 and connects to the outer sheath tube 32. Since each guide tube 41 is provided with two basket wires 42, by setting the outer tube 411 and the inner tube 412 in the guide tube 41, the two basket wires 42 located in the same guide tube 41 are prevented from crossing or knotting, thus ensuring the normal movement of the basket wires 42.

[0079] For ease of description, in this embodiment, the end where the handle assembly 1 is located is referred to as the proximal end, and the end where the basket assembly 4 is located is referred to as the distal end. When using the basket stone retrieval device of Embodiment 1 for stone retrieval, the handle slide 11 is first slid towards the proximal end. At this time, the gripper slider 12 drives the core wire 5 to control the basket wire 42 to enter the guide tube 41, and the basket assembly 4 is in a retracted state. At this time, the outer sheath 32 and the retracted basket assembly 4 can enter the body. After the basket assembly 4 moves to the stone retrieval position, the handle slide 11 is slid towards the distal end. At this time, the gripper slider 12 drives the core wire 5 to control the basket wire 42 to extend out of the guide tube 41, and the basket assembly 4 is in an expanded state. After the basket assembly 4 covers the stone, it switches back to the retracted state and is withdrawn from the body.

[0080] Example 2

[0081] Figures 1 to 14 Embodiment 2 is shown, wherein the same or corresponding components as in Embodiment 1 are referred to by the same reference numerals as in Embodiment 1. For simplicity, only the differences between Embodiment 2 and Embodiment 1 are described. The difference lies in the specific structure of the handle assembly 1 and the spindle assembly 2 in Embodiment 2, which differs from that in Embodiment 1.

[0082] In Embodiment 2, the handle assembly 1 includes an outer tube 13, a gripping part 14, a clamping part 15 and a locking part 16, and the spindle assembly 2 includes a spindle body 21 and a protective sleeve 22.

[0083] The spindle body 21 is slidably mounted on the outer tube 13, so that the spindle assembly 2 can be slidably engaged with the handle assembly 1 through the spindle body 21. The protective sleeve 22 is threadedly connected to the spindle body 21 to form a receiving chamber for accommodating the elastic element 6, which is disposed in the receiving chamber. The protective sleeve 22 is provided with a through-hole communicating with the receiving chamber. The reinforcing tube 31 of the guide tube assembly 3 is axially movable through the through-hole. The reinforcing tube 31 is provided with a fixing part 311, which is located in the receiving chamber and is fixedly connected to one end of the elastic element 6. The other end of the elastic element 6 is fixedly connected to the spindle body 21. The fixing part 311 and the reinforcing tube 31 are integral structures.

[0084] A grip 14 is provided on the outer wall of the outer tube 13 for easy handling by the operator. A second slide groove 131 is provided on the outer tube 13, extending axially along the spindle body 21. A push-pull part 212 is provided on the spindle body 21, passing through the second slide groove 131 and connecting to the spindle body 21. By pushing the push-pull part 212, the operator can slide the spindle assembly 2 within the outer tube 13 of the handle assembly 1. The push-pull part 212 preferably has anti-slip textures.

[0085] The clamping component 15 is located near the end of the outer tube 13 and includes a stop shoulder and two clamping parts that can approach each other. A portion of the clamping component 15 passes into the outer tube 13 and abuts against the end face of the outer tube 13 via the stop shoulder. The core wire 5 is located between the two clamping parts. The locking member 16 is fastened to the outside of the two clamping parts and is threadedly connected to the outer wall of the outer tube 13. When the locking member 16 is threadedly tightened on the outer tube 13, the two clamping parts clamp the core wire 5 in the middle, thereby achieving a fixed connection between the core wire 5 and the handle assembly 1.

[0086] In order to improve the support force for the core wire 5, a reinforcing sleeve 7 covering the outside of the core wire 5 is set at the end of the core wire 5 that is clamped by the two clamping parts. On the one hand, the reinforcing sleeve 7 increases the surface area of ​​the core wire 5 that is clamped by the two clamping parts, thereby facilitating the clamping of the core wire 5 by the two clamping parts. On the other hand, when the push-pull part 212 is pushed to make the spindle assembly 2 drive the outer sheath tube 32 to retract, the support force for the core wire 5 is improved, and the core wire 5 is prevented from bending. At this time, the length of the reinforcing sleeve 7 does not exceed the length of the handle assembly 1.

[0087] For ease of description, in this embodiment, the end where the handle assembly 1 is located is referred to as the proximal end, and the end where the basket assembly 4 is located is referred to as the distal end. When using the basket stone retrieval device of Embodiment 2 for stone retrieval, the push-pull part 212 is first pushed to slide towards the distal end. The push-pull part 212 causes the spindle body 21 to drive the outer sheath tube 32 to move towards the distal end relative to the core wire 5. Since the guide tube 41 is connected inside the outer sheath tube 32, the guide tube 41 moves towards the distal end at this time and the basket wire 42 is drawn into the guide tube 41. At this time, the basket assembly 4 is in a retracted state, and the outer sheath tube 32 and the basket assembly 4 in the retracted state can enter the human body. After the basket assembly 4 moves to the stone retrieval position, the push-pull part 212 is pushed to slide proximally. The push-pull part 212 causes the spindle body 21 to drive the outer sheath tube 32 to move proximally relative to the core wire 5. Since the guide tube 41 is connected inside the outer sheath tube 32, the guide tube 41 moves proximally and releases the basket wire 42. At this time, the basket assembly 4 is in the open state. After the basket assembly 4 covers the stone, it switches to the closed state again and is pulled out of the human body.

[0088] It can be seen that not only are the specific structures of the handle assembly 1 and the spindle assembly 2 different in Embodiment 1, but their operation methods are also different. In Embodiment 1, the outer sheath tube 32 is kept fixed, and the basket wire 42 is retracted or expanded by pulling the core wire 5, while in Embodiment 2, the core wire 5 is kept fixed, and the basket wire 42 is retracted or expanded by pushing and pulling the outer sheath tube 32.

[0089] The solution can be freely chosen from either the first embodiment or the second embodiment, depending on the requirements. Both the first and second embodiments solve the problem that the basket assembly 4 cannot be opened normally during the coiling process due to the kinking of the basket wire 42.

[0090] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. 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 this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A basket stone retrieval device, characterized in that, The net basket stone retrieval device includes a handle assembly (1), a spindle assembly (2), a guide tube assembly (3), a net basket assembly (4), a core wire (5), and an elastic element (6). The spindle assembly (2) is slidably connected to the handle assembly (1) along the axial direction. One end of the elastic element (6) is fixedly connected to the spindle assembly (2), and the other end of the elastic element (6) is fixedly connected to the guide tube assembly (3). One end of the core wire (5) is fixedly connected to the handle assembly (1), and the other end of the core wire (5) slidably passes through the spindle assembly (2), the elastic element (6), and the guide tube assembly (3) and connects to the net basket assembly (4). The basket assembly (4) includes a plurality of guide tubes (41) and basket wires (42) corresponding to each guide tube (41). One end of each guide tube (41) is fixedly connected to the guide tube assembly (3). One end of each basket wire (42) can slide through the corresponding guide tube (41) and be connected to the core wire (5). The other end of each basket wire (42) is fixedly connected to the adjacent guide tube (41) or passes through the adjacent guide tube (41) and is fixedly connected to the guide tube assembly (3).

2. The basket stone-retrieving device according to claim 1, characterized in that, The two ends of the elastic element (6) are respectively snapped into the spindle assembly (2) and the guide tube assembly (3) through a snap-fit ​​structure; Alternatively, the two ends of the elastic element (6) are bonded to the mandrel assembly (2) and the guide tube assembly (3) respectively by adhesive; Alternatively, the two ends of the elastic element (6) are magnetically connected to the spindle assembly (2) and the guide tube assembly (3) respectively via magnetic elements.

3. The basket stone-retrieving device according to claim 1, characterized in that, The basket stone-collecting device also includes a reinforcing wire sleeve (7), which can selectively cover the outside of different areas of the core wire (5).

4. The basket stone-retrieving device according to claim 1, characterized in that, The elastic element (6) is a compressible spring, sheet, or elastic column, and the elastic coefficient of the elastic element (6) is K, which satisfies K≥0.

05.

5. The basket stone-retrieving device according to claim 4, characterized in that, The elastic coefficient K of the elastic element (6) satisfies K≥0.

3.

6. The basket stone-retrieving device according to claim 1, characterized in that, The mandrel assembly (2) includes a mandrel body (21), on which a first groove (211) is provided and a through hole that passes through the mandrel body (21) axially and communicates with the first groove (211). The handle assembly (1) includes a handle sleeve (11) and a gripper slider (12), which is slidably connected to the first groove (211). One end of the core wire (5) is fixedly connected to the gripper slider (12), and the other end of the core wire (5) passes through the through hole. The handle sleeve (11) is slidably fitted on the mandrel body (21) and connected to the gripper slider (12).

7. The basket stone-retrieving device according to claim 6, characterized in that, The gripper slider (12) includes a connecting block (121), a first gripper (122) and a second gripper (123). The first gripper (122) and the second gripper (123) are connected to the connecting block (121) at intervals. The first gripper (122) and the second gripper (123) are provided with clamping protrusions (124) on their opposite sides. The core wire (5) is clamped between the two clamping protrusions (124).

8. The basket stone-retrieving device according to claim 7, characterized in that, The first gripper (122) and the second gripper (123) are provided with a plug-in protrusion (125) on their opposite sides. The handle slide (11) is provided with a plug-in through hole (111) corresponding to the plug-in protrusion (125). The plug-in protrusion (125) is inserted into the plug-in through hole (111).

9. The basket stone-retrieving device according to claim 8, characterized in that, The mandrel assembly (2) also includes a protective sleeve (22), which is threaded to the mandrel body (21) to form a receiving chamber for accommodating the elastic element (6).

10. The basket stone-retrieving device according to claim 1, characterized in that, The guide tube assembly (3) includes a reinforcing tube (31) and an outer sheath tube (32). The reinforcing tube (31) is connected to the spindle assembly (2). The outer sheath tube (32) is partially inserted and fixed inside the reinforcing tube (31). The portion of the outer sheath tube (32) extending out of the reinforcing tube (31) is connected to the basket assembly (4).

11. The basket stone-retrieving device according to claim 10, characterized in that, The guide tube (41) includes an outer tube (411) and an inner tube (412). The end of the basket wire (42) is connected to the core wire (5). The head end of the basket wire (42) passes through the inner tube (412) and then enters the outer tube (411) of the adjacent guide tube (41). The head end of the basket wire (42) is fixedly connected to the outer tube (411) or passes through the outer tube (411) and is fixedly connected to the outer sheath tube (32).

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