Calculus removing device for biliary tract

Abstract

The utility model relates to the technical field of medical instruments, in particular to a calculus removing device for a biliary tract. The calculus removing device for the biliary tract comprises an operating handle, a push-pull guide wire, a traction guide wire, a catheter and a calculus removing basket assembly. And the operating handle is used for controlling the push-pull guide wire and the traction guide wire. And the push-pull guide wire and the traction guide wire are connected with the operating handle. And the traction guide wire and the push-pull guide wire are coaxially arranged in the catheter. The push-and-pull guide wire is internally provided with a channel for the traction guide wire to penetrate through. The calculus removing basket assembly comprises an elastic wire, a first connector and a second connector. And the plurality of elastic wires are arranged between the first connector and the second connector to form a net structure for capturing stones. And one end of the elastic wire is connected with the first connector. And the other end of the elastic wire is connected with the second connector. And the first connector is connected with the traction guide wire. And the second connector is connected with the push-pull guide wire. According to the calculus removing device for the biliary tract, the operation difficulty is reduced, and the controllability of the basket net structure is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a stone removal device for the bile duct. Background Art

[0002] A disposable stone retrieval basket is a medical device used for bile duct stone removal. Biliary stone removal is typically performed under endoscopic retrograde cholangiopancreatography (ERCP). The basket is guided into the bile duct through an endoscope. During the introduction process, the basket remains closed. Once the basket reaches the target location (where the stone is located), the operator deploys the basket's mesh using a control handle. The mesh is typically made of fine, flexible wire and forms a cage-like structure. The deployed mesh surrounds the stone, and further manipulation of the handle closes the basket's mesh, capturing the stone and ultimately removing it.

[0003] For example, Chinese patent document CN215606070U discloses an ERCP-based bile duct stone removal device. This device features a memory metal basket at the front end of an inner tube that fits within the inner lumen of an overtube. The basket can retract within the inner lumen of the overtube and automatically expand into a net-like shape when extended out of the overtube, thereby scraping away muddy and attached stones from the bile duct wall.

[0004] However, the existing disposable stone retrieval baskets have limited control flexibility during actual use. For example, when capturing stones, the operator can only use the control handle to cause the stone retrieval basket and the catheter to produce relative displacement, thereby achieving the expansion and closing of the net. In short, the stone retrieval basket uses the side wall of the catheter to constrain the net, thereby achieving a closed state and capturing stones, and lacks direct control over the net. This greatly increases the difficulty of operation and prolongs the operation time, especially when passing through narrow or curved bile ducts. Summary of the Invention

[0005] The purpose of the present utility model is to provide a stone removal structure during the process of bile duct stone removal, so as to reduce the difficulty of operation and improve the controllability of the basket net of the stone removal basket.

[0006] In order to achieve the above purpose, the present invention adopts the following scheme:

[0007] A stone removal device for the bile duct, comprising an operating handle, a push-pull guide wire, a traction guide wire, a catheter and a stone removal basket assembly;

[0008] The operating handle is used to control the push-pull guidewire and the traction guidewire, and the push-pull guidewire and the traction guidewire are both connected to the operating handle. The traction guidewire and the push-pull guidewire are coaxially arranged in the catheter, and the push-pull guidewire is provided with a channel for passing the traction guidewire;

[0009] The stone removal basket assembly includes an elastic wire, a first connector and a second connector. Multiple elastic wires are arranged between the first connector and the second connector to form a basket net structure for capturing stones. One end of the elastic wire is connected to the first connector, and the other end of the elastic wire is connected to the second connector. The first connector is connected to the traction guide wire, and the second connector is connected to the push-pull guide wire.

[0010] Among them, when performing a bile duct stone removal operation under endoscopic retrograde cholangiopancreatography, after the catheter carrying the stone removal basket assembly reaches the vicinity of the stone location, the operator first drives the push-pull guide wire through the operating handle to push the stone removal basket assembly out of the catheter, and the elastic wire expands under the action of its own elasticity to form a basket net structure to surround and capture the stone; when the basket net structure in the expanded state needs to pass through a narrow or curved bile duct, the operator further drives the traction guide wire through the operating handle, and the traction guide wire drives the first connector to move in the direction away from the second connector, stretching the elastic wire, and then causing the elastic wire to contract toward the traction guide wire along the radial direction of the traction guide wire, thereby reducing the difficulty of operation and improving the controllability of the basket net structure. After waiting to pass through the narrow or curved bile duct, the traction guide wire is released, and the elastic wire will expand again to form a basket net structure.

[0011] Preferably, the end of the traction guidewire passes through the second connector and the first connector in sequence, and the traction guidewire is located inside the basket structure. This arrangement further enhances the stability of the basket structure, making the basket more secure when capturing stones and reducing the risk of accidental disengagement. The traction guidewire can more evenly distribute the force transmitted by the operating handle to various parts of the basket, thereby ensuring smoother and more precise movement of the basket when opening and closing, further improving the success rate and efficiency of stone capture.

[0012] Preferably, the end of the traction guidewire is provided with rounded corners, which is conducive to significantly reducing the friction and scraping of the end of the traction guidewire on the inner wall of the bile duct and surrounding tissues during the operation, greatly reducing the risk of tissue damage and bleeding, and further improving the safety of the operation.

[0013] Preferably, a mesh is provided between adjacent elastic filaments, and the mesh is located on the side close to the first connector. With this arrangement, the introduction of the mesh, on the one hand, enables the basket structure to capture not only larger stones, but also small, muddy stones. The multi-layer capture mechanism greatly improves the overall efficiency of stone removal. By capturing muddy stones, the mesh effectively reduces the risk of stones remaining in the bile duct, reduces the possibility of postoperative stone recurrence, and improves the thoroughness of the operation. On the other hand, the mesh provides additional support and fixation for the entire basket structure, further enhancing the overall stability of the basket, making it more stable and reliable during the process of capturing and removing stones.

[0014] Preferably, the plurality of elastic wires are arranged in a circular array along the axis of the traction guide wire.

[0015] Preferably, the elastic wire is a stainless steel wire.

[0016] Preferably, the net structure is semicircular, diamond-shaped or spiral-shaped.

[0017] Compared with the prior art, the present invention provides a device for removing stones from the bile duct, which has the following substantial features and improvements: the device for removing stones from the bile duct drives the push-pull guide wire and the traction guide wire respectively through the operating handle, so that the operator can more accurately control the expansion and closing of the basket, more effectively capture and remove stones, and improve the success rate of the operation; the push-pull guide wire and the traction guide wire are coaxially arranged, and a channel for passing the traction guide wire is provided in the push-pull guide wire, making the whole device more compact and convenient for operation in the narrow bile duct, improving the flexibility and convenience of operation, and one end of the elastic wire is connected to the first end. The first end of the basket net is connected to the connector, and the other end is connected to the second connector, forming a multi-point fixed design, which improves the stability of the basket net structure, makes the process of capturing stones smoother, and reduces the possibility of accidental falling off, especially when the basket net structure in the expanded state needs to pass through a narrow or curved bile duct, the operator further drives the traction guide wire through the operating handle, and the traction guide wire drives the first connector to move away from the second connector, stretching the elastic wire, and then causing the elastic wire to contract toward the traction guide wire along the radial direction of the traction guide wire, thereby reducing the difficulty of operation and improving the controllability of the basket net structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of a stone removal device for the bile duct in an embodiment of the present utility model.

[0019] Figure 2 yes Figure 1 Schematic diagram of the three-dimensional structure of a stone removal device for the bile duct from another perspective.

[0020] Figure 3 It is a schematic diagram of the three-dimensional structure of another stone removal device for the bile duct in an embodiment of the present utility model.

[0021] Figure numerals: 1, push-pull guide wire; 2, traction guide wire; 3, catheter; 4, stone removal basket assembly; 5, rounded corner; 6, mesh; 41, elastic wire; 42, first connector; 43, second connector. DETAILED DESCRIPTION

[0022] The specific implementation of the present utility model is described in detail below with reference to the accompanying drawings.

[0023] like Figure 1-3As shown, an embodiment of the present invention proposes a stone removal device for the bile duct, which aims to reduce the difficulty of operation and improve the controllability of the basket net of the stone removal basket during the process of bile duct stone removal.

[0024] A stone removal device for the bile duct proposed in an embodiment of the present invention drives the push-pull guide wire 1 and the traction guide wire 2 respectively through an operating handle, so that the operator can more accurately control the expansion and closing of the basket, more effectively capture and remove stones, and improve the success rate of the operation. When the basket structure in the expanded state needs to pass through a narrow or curved bile duct, the operator further drives the traction guide wire 2 through the operating handle. The traction guide wire 2 drives the first connector 42 to move in a direction away from the second connector 43, stretching the elastic wire 41, and then causing the elastic wire 41 to contract toward the traction guide wire 2 along the radial direction of the traction guide wire 2, thereby reducing the difficulty of operation and improving the controllability of the basket structure.

[0025] like Figure 1 As shown, a stone removal device for the biliary tract includes an operating handle, a push-pull guidewire 1, a traction guidewire 2, a catheter 3, and a stone removal basket assembly 4. The operating handle is used to control the push-pull guidewire 1 and the traction guidewire 2. Both the push-pull guidewire 1 and the traction guidewire 2 are connected to the operating handle, and the traction guidewire 2 and the push-pull guidewire 1 are coaxially arranged within the catheter 3. The push-pull guidewire 1 is provided with a channel for the traction guidewire 2 to pass through.

[0026] like Figure 1 Combine Figure 2 As shown, the stone retrieval basket assembly 4 includes an elastic wire 41, a first connector 42, and a second connector 43. Multiple elastic wires 41 are arranged between the first connector 42 and the second connector 43 to form a basket structure for catching stones. One end of the elastic wire 41 is connected to the first connector 42. The other end of the elastic wire 41 is connected to the second connector 43. The first connector 42 is connected to the traction guidewire 2. The second connector 43 is connected to the push-pull guidewire 1.

[0027] like Figure 2 As shown, the end of the traction guidewire 2 passes through the second connector 43 and the first connector 42 in sequence. The traction guidewire 2 is located within the basket structure. This arrangement further enhances the stability of the basket structure, making the net more secure when capturing stones and reducing the risk of accidental dislodgment. The traction guidewire 2 can more evenly distribute the force transmitted by the operating handle to all parts of the net, ensuring smoother and more precise movement during the expansion and closing of the net, further improving the success rate and efficiency of stone capture.

[0028] Furthermore, the positioning of the guide wire 2 within the basket structure helps prevent unnecessary deformation during operation. This maintains the optimal shape of the basket structure, improving its ability to capture and remove stones and reducing the possibility of damage. Furthermore, the presence of the guide wire 2 makes the opening and closing of the basket structure more flexible and controllable, allowing the operator to more easily adjust the shape and size of the basket structure to accommodate different stone types and sizes, further enhancing operational flexibility and adaptability.

[0029] like Figure 2 As shown, multiple elastic wires 41 are arranged in a circular array along the axis of the traction guide wire 2. For example, the number of elastic wires 41 is preferably 3-6. The elastic wires 41 are preferably stainless steel wires.

[0030] like Figure 1 As shown, the end of the traction guidewire 2 is provided with a rounded corner 5. Such a configuration is conducive to significantly reducing the friction and scraping of the end of the traction guidewire 2 on the inner wall of the bile duct and surrounding tissues during the operation, greatly reducing the risk of tissue damage and bleeding, and further improving the safety of the operation.

[0031] In order to further improve the capture efficiency of the net structure, Figure 3 As shown, a mesh 6 is provided between adjacent elastic wires 41, and the mesh 6 is located on the side close to the first connector 42. With this arrangement, the introduction of the mesh 6 enables the basket structure to capture not only larger stones, but also small, sand-like stones. The multi-layer capture mechanism greatly improves the overall stone removal efficiency. By capturing sand-like stones, the mesh 6 effectively reduces the risk of stones remaining in the bile duct, reduces the possibility of stone recurrence after surgery, and improves the thoroughness of the surgery.

[0032] Furthermore, the mesh 6 provides additional support and fixation for the entire net structure, further enhancing the overall stability of the net and making it more stable and reliable during the process of capturing and removing stones.

[0033] The basket net structure in the stone removal device for the bile duct proposed in the embodiment of the present invention can be semicircular, diamond-shaped or spiral-shaped. The most suitable basket net structure is selected according to the patient's specific situation and the type of stone to improve the personalization and accuracy of the operation. For example, the semicircular design can be deployed in a relatively narrow bile duct, adapting to different bile duct shapes and structures to ensure the success rate of stone capture. The diamond-shaped design can provide better structural support and stability, making the basket net structure more firm and reliable when deployed and closed. The spiral design can effectively roll up and capture stones, especially muddy or fragmented stones, through a rotating action, thereby improving the capture efficiency.

[0034] When a bile duct stone removal device proposed in an embodiment of the present invention is used for bile duct stone removal under endoscopic retrograde cholangiopancreatography, after the catheter 3 carrying the stone removal basket assembly 4 reaches the vicinity of the stone location, the operator first drives the push-pull guide wire 1 through the operating handle to push the stone removal basket assembly 4 out of the catheter 3, and the elastic wire 41 expands under the action of its own elasticity to form a basket net structure for surrounding and capturing the stone.

[0035] When the basket net structure in the expanded state needs to pass through a narrow or curved bile duct, the operator further drives the traction guidewire 2 through the operating handle, and the traction guidewire 2 drives the first connector 42 to move in a direction away from the second connector 43, thereby stretching the elastic wire 41, and then causing the elastic wire 41 to contract along the radial direction of the traction guidewire 2 toward the traction guidewire 2, thereby reducing the difficulty of operation and improving the controllability of the basket net structure. After waiting to pass through the narrow or curved bile duct, the traction guidewire 2 is released, and the elastic wire 41 will expand again to form a basket net structure.

[0036] The present invention is not limited to the specific technical solutions described in the above embodiments. In addition to the above embodiments, the present invention may also have other implementation methods. For those skilled in the art, any technical solution formed by any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A stone removal device for the bile duct, characterized in that: It includes an operating handle, a push-pull guide wire (1), a traction guide wire (2), a catheter (3) and a stone removal basket assembly (4); The operating handle is used to control the push-pull guide wire (1) and the traction guide wire (2), and the push-pull guide wire (1) and the traction guide wire (2) are both connected to the operating handle. The traction guide wire (2) and the push-pull guide wire (1) are coaxially arranged in the catheter (3), and a channel for passing the traction guide wire (2) is provided in the push-pull guide wire (1); The stone removal basket assembly (4) includes an elastic wire (41), a first connector (42) and a second connector (43). A plurality of elastic wires (41) are arranged between the first connector (42) and the second connector (43) to form a basket structure for capturing stones. One end of the elastic wire (41) is connected to the first connector (42), and the other end of the elastic wire (41) is connected to the second connector (43). The first connector (42) is connected to the traction guide wire (2), and the second connector (43) is connected to the push-pull guide wire (1).

2. The stone removal device for the bile duct according to claim 1, characterized in that: The end of the traction guide wire (2) passes through the second connector (43) and the first connector (42) in sequence, and the traction guide wire (2) is located inside the basket net structure.

3. The stone removal device for the bile duct according to claim 2, characterized in that: The end of the traction guide wire (2) is provided with a rounded corner (5).

4. The stone removal device for the bile duct according to claim 1, characterized in that: A mesh (6) is provided between adjacent elastic threads (41), and the mesh (6) is located on a side close to the first connector (42).

5. The stone removal device for the bile duct according to claim 1, characterized in that: A plurality of elastic wires (41) are arranged in a circular array along the axis of the traction guide wire (2).

6. The stone removal device for the bile duct according to claim 1, characterized in that: The elastic wire (41) is a stainless steel wire.

7. The stone removal device for the bile duct according to claim 1, characterized in that: The net structure is semicircular, diamond or spiral.

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