A conduit and basket

Abstract

This application provides a catheter and a basket, relating to the field of medical device technology. The catheter includes a sheath and an adapter. The adapter has a first connecting portion and a second connecting portion. The first connecting portion has a first guidewire guide hole, the wall of which has a first side opening for inserting a visual guidewire. The first side opening penetrates the outer wall of the first connecting portion and extends from one end face of the first guidewire guide hole to the other end face, so that the wall of the first guidewire guide hole forms a non-closed structure. The second connecting portion is connected to the sheath. The width of the first side opening is smaller than the outer diameter of the visual guidewire, and at least one of the two ends of the first side opening is configured as an elastic structure. The catheter provided by this application allows for insertion of a visual guidewire without being limited by a proximal connector, enabling catheter insertion guided by a visual guidewire with high efficiency.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and in particular to a catheter and basket. Background Technology

[0002] The advent of visual guidewires has reduced the difficulty of ERCP procedures. However, in procedures to remove stones or polyps, the proximal end of the visual guidewire has a connector, which prevents the inner hole of catheters with conventional endoscopic instruments from passing through it. Without guidewire guidance, the catheter can only cross the papilla and enter the bile duct with the help of the forceps and lifters of the duodenoscope, resulting in low efficiency or failure to reach the intended position. Summary of the Invention

[0003] In view of this, the purpose of this application is to overcome the shortcomings of the prior art and provide a catheter and basket in which the catheter is inserted into the visual guidewire without being restricted by the proximal connector, and can realize the use of the visual guidewire to guide the catheter for insertion, resulting in high work efficiency.

[0004] This application provides the following technical solution:

[0005] In a first aspect, embodiments of this application provide a catheter, the catheter comprising:

[0006] Sheath;

[0007] An adapter has a first connecting portion and a second connecting portion. The first connecting portion has a first guide wire guide hole. The wall of the first guide wire guide hole has a first side opening. The first guide wire guide hole is used to pass through a visible guide wire. The first side opening penetrates the outer wall of the first connecting portion and extends from one end face of the first guide wire guide hole to the other end face, so that the wall of the first guide wire guide hole forms a non-closed structure. The second connecting portion is connected to the sheath. The width of the first side opening is smaller than the outer diameter of the visible guide wire, and at least one of the two ends of the first side opening is provided as an elastic structure.

[0008] In some embodiments of the first aspect, the number of the adapters is multiple, and the multiple adapters are spaced apart along the axial direction of the sheath.

[0009] In some embodiments of the first aspect, the two ends of the first side opening are misaligned, and the two ends of the first side opening have overlapping portions when projected axially onto the first guide wire guide hole.

[0010] In some embodiments of the first aspect, the catheter further includes:

[0011] A spreading tube is provided, wherein the spreading tube is configured as an elastic structure; wherein one end of the first side opening passes through a portion of the spreading tube, and the side of the other end of the first side opening abuts against the side wall of the spreading tube.

[0012] In some embodiments of the first aspect, the adapter and the sheath are detachably connected.

[0013] In some embodiments of the first aspect, the second connecting portion has a mounting hole, which is arranged parallel to the first guide wire guide hole, and the sheath passes through the mounting hole;

[0014] Wherein, the sheath tube and the mounting hole are interference-fitted; and / or, the sheath tube and the hole wall of the mounting hole are connected.

[0015] In some embodiments of the first aspect, the wall of the mounting hole has a second side opening that penetrates the outer wall of the adapter and extends from one end face of the mounting hole to the other end face, so that the wall of the mounting hole forms a non-closed structure.

[0016] In some embodiments of the first aspect, the mounting hole has a second side opening in its wall, which communicates with the first guide wire guide hole. The second side opening extends from one end face of the mounting hole to the other end face, so that the mounting hole wall forms a non-closed structure.

[0017] In some embodiments of the first aspect, both the first side opening and the second side opening extend axially along the sheath.

[0018] In some embodiments of the first aspect, the first side opening extends axially along the sheath, one end of the opposite ends of the first side opening is provided with an adhesive portion, the adhesive portion is bonded to a corresponding side of the sheath, and the other end of the opposite ends of the first side opening is connected to a corresponding side of the sheath.

[0019] In some embodiments of the first aspect, the first side opening extends axially along the sheath, one end of the opposite ends of the first side opening is fixedly connected to a corresponding side of the sheath, and the other end of the opposite ends of the first side opening is engaged with a corresponding side of the sheath.

[0020] Secondly, this application also provides a net basket, the net basket comprising:

[0021] The catheter as described in any of the above embodiments;

[0022] The sheath has a basket wire and a traction wire, and has a distal end, a first clamping channel and a proximal end. The basket wire and the traction wire are sequentially inserted into the first clamping channel from the distal end to the proximal end, and the basket wire and the traction wire are connected at their closest ends.

[0023] A first connector is connected to the end of the basket wire away from the proximal end, and the first connector is located outside the sheath. The first connector has a second guide wire guide hole for inserting the visible guide wire. The wall of the second guide wire guide hole has a third side opening that penetrates the outer wall of the first connector and extends from the end face of one end of the second guide wire guide hole to the end face of the other end, so that the wall of the second guide wire guide hole forms a non-closed structure.

[0024] In some embodiments of the first aspect, the sheath further has a second clamp channel that extends in the same direction as the first clamp channel.

[0025] The embodiments of this application have the following advantages:

[0026] This application provides a catheter with an adapter, which has a first connecting portion and a second connecting portion. The first connecting portion has a first guidewire guide hole, and a first side opening extending through the entire length is provided on one side of the first guidewire guide hole. This first side opening is ensured to be narrower than the outer diameter of the visible guidewire, and at least one end is made of an elastic material. This design ensures that the guidewire can be stably fixed while allowing larger proximal connectors to pass through easily without obstruction. This unique structure allows the visible guidewire to smoothly pass through the first guidewire guide hole from the first side opening on the side of the first connecting portion, even in the presence of a large proximal connector. Furthermore, due to the sheath connection between the adapter and the catheter, the visible guidewire is effectively inserted into the catheter.

[0027] Clearly, this application not only solves the problem of the inability to insert the visual guidewire into the catheter due to the proximal connector of the visual guidewire in the traditional method, but also improves the overall work efficiency, enabling doctors to use the visual guidewire in conjunction with the catheter to complete the relevant surgical steps more quickly and accurately.

[0028] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 A schematic diagram of the structure of a catheter provided in one embodiment of this application is shown;

[0031] Figure 2 This illustration shows a schematic diagram of the form of a catheter adapter according to an embodiment of this application.

[0032] Figure 3 This illustration shows another perspective structural diagram of a catheter adapter provided in one embodiment of this application;

[0033] Figure 4 This illustration shows a schematic diagram of a second form of a catheter adapter according to an embodiment of this application.

[0034] Figure 5 This illustration shows a schematic diagram of the third form of a catheter adapter according to an embodiment of this application.

[0035] Figure 6 This illustration shows a schematic diagram of the form of a catheter adapter according to an embodiment of this application.

[0036] Figure 7 This illustration shows a schematic diagram of the configuration of a catheter adapter according to an embodiment of this application.

[0037] Figure 8 This illustration shows a schematic diagram of the form of a catheter adapter according to an embodiment of this application.

[0038] Figure 9 This illustration shows a schematic diagram of the form of a first connector of a catheter according to an embodiment of this application.

[0039] Figure 10 This illustration shows another perspective structural diagram of a catheter adapter provided in one embodiment of this application;

[0040] Figure 11 This illustration shows a schematic diagram of a second form of a catheter adapter according to an embodiment of this application.

[0041] Figure 12This illustration shows a schematic diagram of the third form of a catheter adapter according to an embodiment of this application.

[0042] Figure 13 This illustration shows a schematic diagram of the first state structure of a catheter according to an embodiment of this application;

[0043] Figure 14 A schematic diagram of the second state structure of a catheter provided in one embodiment of this application is shown;

[0044] Figure 15 This illustration shows a schematic diagram of the third state structure of a catheter according to an embodiment of this application;

[0045] Figure 16 A schematic diagram of the structure of a catheter provided in another embodiment of this application is shown;

[0046] Figure 17 A schematic diagram of the structure of a catheter provided in another embodiment of this application is shown;

[0047] Figure 18 A schematic diagram of the structure of a catheter provided in another embodiment of this application is shown;

[0048] Figure 19 A schematic diagram of the structure of a catheter sheath provided in another embodiment of this application is shown.

[0049] Description of main component symbols:

[0050] 100-Sheath tube; 110-First clamping channel; 120-Second clamping channel; 200-Adapter; 210-First side opening; 220-First guide wire guide hole; 230-Mounting hole; 240-Second side opening; 250-Adhesive part; 300-Traction wire; 400-Second connector; 500-Basket wire; 600-First connector; 610-Second guide wire guide hole; 620-Third side opening; 630-Fasting hole; 700-Channel tube. Detailed Implementation

[0051] The embodiments of this application 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 this application, and should not be construed as limiting this application.

[0052] It should be noted that when an element is said to be "fixed" to another element, it can be directly on the other element or there may be an intervening element. When an element is said to be "connected" to another element, it can be directly connected to the other element or there may be an intervening element. Conversely, when an element is said to be "directly" on another element, there is no intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0053] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., 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 application according to the specific circumstances.

[0054] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0055] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the template description is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0056] Among related technologies, biliary and pancreatic diseases are common in clinical practice, and endoscopic treatment, especially endoscopic retrograde cholangiopancreatography (ERCP), is a commonly used method. During ERCP, X-rays are required for observation, which obviously poses the problem of radiation exposure to doctors and patients, as well as the problem of slow recovery caused by contrast agent infiltration or placement in the bile duct.

[0057] The advent of visual guidewires has reduced the difficulty of ERCP procedures and the impact of X-rays. However, in procedures to remove stones or polyps, the proximal connector of the visual guidewire prevents the catheter from passing through its inner hole. Without guidewire guidance, the catheter must rely on the forceps and lifters of the duodenoscope to cross the papilla and enter the bile duct, resulting in low efficiency or failure to reach the intended location.

[0058] like Figure 1 and Figure 2 As shown, in order to solve the above-mentioned technical problems, this application provides a catheter. This embodiment takes a basket-type catheter as an example, and the invention is applicable to all catheters. The catheter includes a sheath 100 and an adapter 200. The adapter 200 has a first connecting part and a second connecting part. The first connecting part has a first guidewire guide hole 220. The wall of the first guidewire guide hole 220 has a first side opening 210. The first guidewire guide hole 220 is used to pass through a visible guidewire. The first side opening 210 penetrates the outer wall of the first connecting part and extends from the end face of one end of the first guidewire guide hole 220 to the end face of the other end, so that the wall of the first guidewire guide hole 220 forms a non-closed structure. The second connecting part is connected to the sheath 100. The width of the first side opening 210 is smaller than the outer diameter of the visible guidewire, and at least one of the two ends of the first side opening 210 is provided as an elastic structure.

[0059] These embodiments provide an improved catheter design, particularly suitable for endoscopic retrograde cholangiopancreatography (ERCP). This novel design effectively addresses a problem in the prior art where standard catheters cannot pass through when guided by a visual guidewire due to the large size of the connector at the proximal end of the guidewire.

[0060] The catheter includes a specially designed adapter 200, which has two key parts: a first connecting part and a second connecting part. The first connecting part has a first guidewire guide hole 220 with a first side opening 210. This special structure allows the visible guidewire to pass smoothly through the first guidewire guide hole 220 from the first side opening 210 on the side of the first connecting part, even in the presence of a large proximal connector. Since the adapter 200 is connected to the sheath 100 of the catheter, the visible guidewire is effectively inserted into the catheter.

[0061] Furthermore, by setting the first guide wire guide hole 220 to a non-closed state, that is, by providing a first side opening 210 extending through the entire length on one side of the first guide wire guide hole 220, and ensuring that the width of this first side opening 210 is less than the visible outer diameter of the guide wire, and at least one end is made of an elastic material, this ensures that the guide wire can be stably fixed while allowing it to pass easily through larger proximal connectors without obstruction. Of course, in other embodiments, both ends of the first side opening 210 can also be made of elastic structures. Alternatively, the adapter 200 can be entirely made of elastic elements.

[0062] For example, in this embodiment, the extension path of the first side opening 210 is parallel to the axis of the sheath 100. Of course, in other embodiments, the extension path of the first side opening 210 can be set to extend obliquely. If it is necessary for the visible guide wire to enter or exit the first guide wire guide hole 220 at a certain angle, the first side opening 210 can be set to have a certain tilt angle relative to the axis of the sheath 100.

[0063] Alternatively, the extension path of the first lateral opening 210 can be designed as a curved extension. For some complex cases, more flexible control over the position of the visual guidewire may be required. In this case, the first lateral opening 210 can be designed to extend along a curved path. This design allows the guidewire to better conform to the naturally curved ducts, such as the bile duct or pancreatic duct.

[0064] Alternatively, the extension path of the first side opening 210 can be designed in segments. For example, the beginning part can be straight, and then turn to a diagonal or curved direction, which can ensure smooth initial insertion while providing the flexibility required for subsequent operations.

[0065] Of course, for ease of operation, the first side opening 210 can be set at the end of the adapter 200 away from the sheath 100. This setting helps to increase the operating space and reduce the interference of the sheath 100 on the path of the operating visible guide wire into the first guide wire guide hole 220.

[0066] Clearly, this design not only solves the problem of the inability to insert the visual guidewire into the catheter due to the proximal connector of the guidewire in traditional methods, but also improves overall work efficiency, enabling doctors to use the visual guidewire in conjunction with the catheter to complete relevant surgical steps more quickly and accurately. In other words, the design of this new catheter and its supporting system significantly enhances the ability to handle specific situations in endoscopic surgery, especially for those situations that require the guidance of a visual guidewire but are difficult to apply directly due to its special structure.

[0067] In some embodiments, there are multiple adapters 200, which are spaced apart along the axial direction of the sheath 100.

[0068] In these embodiments, to further enhance the flexibility and adaptability of the catheter, multiple adapters 200 can be designed to be spaced apart along the axial direction of the sheath 100. This design increases operational flexibility; the multiple adapters 200 distributed throughout the catheter allow the guidewire to be positioned close to the catheter at different locations, thereby facilitating the manipulation of the catheter along the guidewire and reducing movement resistance.

[0069] In simple terms, by setting up multiple adapters 200, the catheter can be guided and supported at different locations, ensuring it maintains the correct path throughout the procedure. This is especially important for operations requiring precise control of the catheter's trajectory.

[0070] Furthermore, the presence of multiple adapters 200 can distribute stress and reduce the load on individual connection points, thereby improving the stability and durability of the entire system.

[0071] Furthermore, the distance between each adapter 200 can be set according to actual needs, for example, an adapter 200 can be set at certain intervals.

[0072] For example, the number of adapters 200 is 10. Of course, in other embodiments, the number of adapters 200 may also be 3, 5, 8, 12, 14, 16, etc.

[0073] like Figure 2 and Figure 3 As shown, in some embodiments, the two ends of the first side opening 210 are misaligned, and the two ends of the first side opening 210 have overlapping portions when projected axially into the first guide wire guide hole 220.

[0074] In these embodiments, by misaligning the two ends of the first side opening 210, the visual guidewire is subjected to greater constraint as it passes through the first guidewire guide hole 220, thereby more firmly securing the visual guidewire and increasing the difficulty for it to detach from the first guidewire guide hole 220. This is particularly useful for controlling the direction of catheter movement.

[0075] Because the two ends are misaligned and overlap in the axial direction, this forms a maze-like or locking structure, making it difficult for the guidewire to slip out from the first side opening 210, thus increasing safety. It should be noted that although the fixation ability is enhanced, because there is a certain overlap area at both ends, the doctor can still adjust the position of the visual guidewire by appropriate operation (such as rotation or slight pulling) to enter and exit the first guidewire guide hole 220.

[0076] Furthermore, the staggered design can accommodate visual guidewires of different diameters to some extent. Thinner guidewires may be easier to pass through, while thicker guidewires will encounter greater resistance during passage, but can still be effectively guided and secured.

[0077] For example, the specific misalignment angles at both ends of the first side opening 210 can be set as needed. For instance, the angular misalignment angle at both ends is 5°. Of course, in other embodiments, the angular misalignment angles at both ends can also be 7°, 9°, 11°, 13°, 15°, etc., to ensure sufficient overlap area in the axial direction.

[0078] To further optimize this design, elastic material can be used at one or both ends of the staggered opening. As the visual guidewire passes through, the elastic material provides sufficient pressure to hold the guidewire in place while allowing appropriate deformation to facilitate its smooth passage.

[0079] like Figure 4 As shown, in some embodiments, the catheter further includes a spreading tube, which is configured as an elastic structure; wherein, one end of the first side opening 210 passes through a portion of the spreading tube, and the side of the other end of the first side opening 210 abuts against the side wall of the spreading tube.

[0080] In these embodiments, the catheter also includes a spreading tube designed as an elastic structure, meaning it can deform elastically. This design further enhances the functionality and operational flexibility of the adapter 200. Specifically, the main function of the spreading tube is to help the first guidewire guide hole 220 expand better, i.e., to facilitate the expansion of the first side opening 210. One end of the first side opening 210 passes through a portion of the spreading tube, meaning the length of the first side opening 210 inserted into the spreading tube is less than the length of the spreading tube. The other end of the second side opening 240 abuts against the side wall of the spreading tube, i.e., the spreading tube is not inserted. For ease of description, the first side opening 210 has a first end and a second end, the first end passing through one end of the spreading tube, and the side wall of the other end of the spreading tube abutting against the side wall of the second end. During use, the portion where the second end of the spreading tube and the second side opening 240 abuts is empty, meaning this section has low rigidity. By lifting this portion, a gap greater than or equal to the wall thickness of the spreading tube is formed between the first end and the second end of the first side opening 210, allowing for easier passage and fixation to the visual guidewire. After connecting both, the spreading tube can be removed.

[0081] Optionally, a guide angle is provided on the end face of the end that abuts the second end of the spreading tube and the second side opening 240, which facilitates the visual guide wire to pass through the gap between the first end and the second end (i.e., the first side opening 210) under the action of the inclined surface of the guide angle.

[0082] For example, the material of the expansion tube is PTFE. Of course, in other embodiments, the material of the expansion tube can also be polyethylene, polypropylene, polyurethane, etc.

[0083] In some embodiments, the adapter 200 and the sheath 100 are detachably connected.

[0084] In these embodiments, the adapter 200 and sheath 100 are designed to be detachably connected. This design provides greater flexibility and convenience, especially when it is necessary to change to different types of adapter 200 or maintain the catheter. That is, the physician can select the appropriate type of adapter 200 based on the specific needs of the catheter during the procedure, such as different sizes of the first guidewire guide hole 220, different designs of the first side opening 210, etc. Furthermore, the detachable design allows each component to be thoroughly cleaned and sterilized individually, helping to reduce the risk of infection.

[0085] Furthermore, by setting the adapter 200 and the sheath 100 as separate structures, it is advantageous to use a standard guidewire (non-visual guidewire) when using a standard guidewire, since the standard guidewire does not have a proximal connector, so there is no need to use the adapter 200 and no need to redesign the catheter for a visual guidewire.

[0086] For example, the adapter 200 and the sheath 100 are connected by a snap-fit ​​mechanism. The adapter 200 and the sheath 100 are provided with mutually cooperating snap-fit ​​structures, which can be connected or separated by pressing or rotating.

[0087] Alternatively, the adapter 200 and the sheath 100 can be connected by a pin, with corresponding holes on the adapter 200 and the sheath 100, and the connection can be achieved by inserting a pin or other fixing device.

[0088] like Figure 5 As shown, in some embodiments, the second connecting portion has a mounting hole 230, the mounting hole 230 and the first guide wire guide hole 220 are arranged in parallel, and the sheath tube 100 passes through the mounting hole 230; wherein, the sheath tube 100 and the mounting hole 230 are interference fit; and / or, the sheath tube 100 and the hole wall of the mounting hole 230 are bonded together.

[0089] In these embodiments, the second connection portion has a mounting hole 230, which is arranged parallel to the first guidewire guide hole 220. The sheath 100 passes through this mounting hole 230, and a secure connection between the two can be ensured by one or a combination of the following methods:

[0090] Interference fit: An interference fit refers to a tight connection achieved by pressing a slightly larger sheath 100 into a slightly smaller mounting hole 230, utilizing the elastic deformation of the material. No additional fasteners or adhesives are required, and the sheath 100 is easy to install and remove.

[0091] It should be noted that the sheath tube 100 and the mounting hole 230 are configured with an interference fit or a transition fit. This allows the adapter 200 to be moved along the sheath tube 100 after the sheath tube 100 is inserted into the mounting hole 230, thereby adjusting the position of the adapter 200 on the sheath tube 100. This ensures that multiple adapters 200 are distributed in preset positions on the sheath tube 100, maintaining the required distance between adjacent adapters 200. However, for added security, the adapter 200 can be further secured by applying adhesive or other methods after its position on the sheath tube 100 has been adjusted. Alternatively, locking screws can be used for limiting the position, etc., which are not specifically limited here.

[0092] Bonding: Bonding is achieved by using a medical-grade adhesive to secure the sheath 100 and the wall of the mounting hole 230 together. The adhesive provides a very strong bond and is suitable for high-stress applications. Simply apply an appropriate amount of adhesive and allow it to cure. Filling minute gaps: For applications with less stringent dimensional tolerances, the adhesive can fill minute gaps, improving overall stability.

[0093] For example, select adhesives suitable for medical applications, such as epoxy resins, cyanoacrylates (super glue), etc.

[0094] By combining the advantages of interference fit and adhesive bonding, a dual safety guarantee is provided. Even if the adhesive fails, the interference fit can still provide a certain degree of connection strength.

[0095] For example, an interference fit is first applied to ensure a basic mechanical connection. Then, a small amount of adhesive is applied to the contact surfaces to further strengthen the connection. To ensure the effectiveness of the interference fit, the dimensional tolerances of the sheath 100 outer diameter and the mounting hole 230 inner diameter need to be precisely controlled. Typically, the interference fit should be between 0.05 mm and 0.15 mm, with the specific value depending on the elastic modulus of the material used and the design requirements.

[0096] It should be noted that the connection between the adapter 200 and the sheath 100 must be very secure to ensure that it will not loosen during operation. By using a combination of interference fit and adhesive bonding, it can be ensured that even under high stress, the sheath 100 and the adapter 200 will not separate or move relative to each other, thus guaranteeing the normal movement of the sheath 100.

[0097] For ease of understanding, the installation process for the adapter 200 is provided below:

[0098] First, install multiple adapters 200 onto the sheath 100 in sequence. Then, adjust and fix the position of the adapters 200 on the sheath 100. Finally, insert the first guide wire guide hole 220 into the side of the visible guide wire.

[0099] like Figure 6 As shown, in some embodiments, the wall of the mounting hole 230 has a second side opening 240 that penetrates the outer wall of the adapter 200 and extends from the end face of one end of the mounting hole 230 to the end face of the other end, so that the wall of the mounting hole 230 forms a non-closed structure.

[0100] In these embodiments, the mounting hole 230 has a second side opening 240 that penetrates the outer wall of the adapter 200 and extends from one end of the mounting hole 230 to the other. This design makes the hole wall of the mounting hole 230 a non-closed structure. Clearly, the presence of the second side opening 240 allows the sheath 100 to be more easily inserted into or removed from the mounting hole 230, especially when quick assembly or disassembly of the sheath 100 is required. This design simplifies the assembly process and improves operational efficiency.

[0101] Secondly, the non-closed structure of the mounting hole 230 can ensure a tight fit between the sheath 100 and the mounting hole 230 through appropriate material selection and design, thereby providing sufficient stability and ensuring that the relative positions of the two are fixed.

[0102] For example, the adapter 200 is made of a material with good elasticity and resilience, such as silicone or polyurethane. These materials can deform under stress and return to their original shape, ensuring the stable fixation of the sheath 100. Furthermore, if higher mechanical strength is required, a plastic or metal material with a certain degree of elasticity, such as nylon or stainless steel, can be selected, and the elastic effect can be achieved through appropriate structural design.

[0103] Furthermore, the width of the second side opening 240 should be smaller than the outer diameter of the sheath 100 to ensure that after the sheath 100 is inserted, the hole wall can apply a certain pressure to the sheath 100, thereby achieving a stable connection. This increases the difficulty for the sheath 100 to detach from the mounting hole 230. In other words, normal surgical procedures cannot detach the sheath 100 from the mounting hole 230; separation can only be achieved by manually applying external force.

[0104] For example, small protrusions or grooves are provided at the edge of the second side opening 240 to increase friction and prevent the sheath 100 from sliding.

[0105] For example, elastic buckles are provided at both ends of the second side opening 240. When the sheath 100 is inserted, the buckles will automatically lock, providing additional fixing force.

[0106] Optionally, if the adapter 200 is made of an elastic material, injection molding is used to ensure the accuracy of the hole wall and the second side opening 240. If the adapter 200 is made of a rigid material, machining (such as CNC machining) is required to ensure the accuracy and surface quality of the opening.

[0107] For example, for ease of operation, the second side opening 240 is positioned at the end of the adapter 200 away from the first guide wire guide hole 220.

[0108] like Figure 7 As shown, in some embodiments, the mounting hole 230 has a second side opening 240 in its hole wall, which communicates with the first guide wire guide hole 220. The second side opening 240 extends from the end face of one end of the mounting hole 230 to the end face of the other end, so that the hole wall of the mounting hole 230 forms a non-closed structure.

[0109] In these embodiments, the mounting hole 230 has a second side opening 240 in its wall, and this second side opening 240 communicates with the first guidewire guide hole 220. The second side opening 240 extends from one end of the mounting hole 230 to the other end, making the wall of the mounting hole 230 a non-closed structure. Since the second side opening 240 communicates with the first guidewire guide hole 220, the visible guidewire can enter or exit the first guidewire guide hole 220 through this first side opening 210, and the sheath 100 can also enter and exit the mounting hole 230 through the first side opening 210.

[0110] Obviously, the above settings, while ensuring that the visual guidewire can move along the first guidewire guide hole 220, reduce the distance between the visual guidewire and the sheath 100, which is beneficial for movement in narrow cavities. This allows doctors to adjust the position of the guidewire and the sheath 100 more flexibly.

[0111] In some embodiments, the first side opening 210 and the second side opening 240 are both provided to extend along the axial direction of the sheath 100.

[0112] In these embodiments, both the first side opening 210 and the second side opening 240 extend axially along the sheath 100, ensuring consistent insertion direction of the visual guidewire and the sheath 100, simplifying the operation. This consistency helps reduce operational errors. The axially extending design allows the visual guidewire and sheath 100 to experience uniform pressure distribution as they pass through the orifice, thereby improving their stability within the orifice. Furthermore, the visual guidewire and sheath 100 do not experience unnecessary bending or twisting due to changes in the position or orientation of the openings.

[0113] Furthermore, the axially extending opening design is relatively simple and easy to manufacture using methods such as injection molding or machining. During assembly, the guide wire and sheath 100 can be inserted more smoothly, reducing assembly difficulty. The axially extending design maximizes the use of the space in the adapter 200, avoiding space waste caused by inconsistent opening positions. This design makes the entire system more compact, reduces overall size, and improves operational flexibility.

[0114] like Figure 8 As shown, in some embodiments, the first side opening 210 extends along the axial direction of the sheath tube 100, and one end of the opposite ends of the first side opening 210 is provided with an adhesive portion 250, which is bonded to the corresponding side of the sheath tube 100. The other end of the opposite ends of the first side opening 210 is connected to the corresponding side of the sheath tube 100.

[0115] In these embodiments, one end of the opposite ends of the first side opening 210 is provided with an adhesive portion 250, which is bonded to the corresponding side of the sheath tube 100, while the other end of the opposite end of the first side opening 210 is connected to the corresponding side of the sheath tube 100 in other ways.

[0116] The adhesive portion 250 provides additional fixing force to ensure that the visible guide wire can be confined within the first guide wire guide hole 220 when passing through the first side opening 210, which facilitates the sheath tube 100 to close the first side opening 210.

[0117] The other end of the first side opening 210 can employ other connection methods, such as elastic structures, snap-fit, or adhesive bonding. Adhesive bonding is a simple and reliable connection method that is easy to implement during the manufacturing process. By combining the adhesive part 250 with another connection method, the assembly process can be simplified and work efficiency improved.

[0118] For example, the adhesive portion 250 uses a medical-grade adhesive layer, such as an epoxy resin layer, a cyanoacrylate layer, or a peelable adhesive layer, which have good biocompatibility and adhesive strength. It should be noted that the adhesive portion 250 should be large enough to ensure sufficient bonding area, thereby providing adequate fixing force.

[0119] In some embodiments, the first side opening 210 extends along the axial direction of the sheath 100, one end of the opposite ends of the first side opening 210 is fixedly connected to the corresponding side of the sheath 100, and the other end of the opposite ends of the first side opening 210 is snapped or glued to the corresponding side of the sheath 100.

[0120] In these embodiments, one end of the opposite ends of the first side opening 210 is fixedly connected to the corresponding side of the sheath 100, while the other end is connected to the corresponding side of the sheath 100 via a snap-fit ​​connection. This design combines the stability of a fixed connection with the flexibility of a snap-fit ​​or adhesive connection, providing a more optimized user experience and higher reliability.

[0121] One end of the first side opening 210 can be fixedly connected to the sheath 100 by welding (such as ultrasonic welding or laser welding) or using medical-grade adhesives (such as epoxy resin or cyanoacrylate). The other end of the first side opening 210 can be provided with a resilient snap-fit ​​structure, which can engage with a corresponding slot or protrusion on the sheath 100 to form a detachable but stable connection. For example, a small hole or groove can be provided on the sheath 100, and a corresponding pin can be provided at the other end of the first side opening 210, which can be inserted and locked by rotation or other means.

[0122] Obviously, the above settings can solve the problem of bonding failure due to aging. The pre-connection at one end of the first side opening 210 can reduce the number of times of snapping or bonding and improve efficiency.

[0123] like Figure 1 , Figure 9 and Figure 10 As shown, in some embodiments, this application also provides a basket, which includes a conduit, basket wire 500, traction wire 300, a first connector 600 and a second connector 400. The sheath 100 has a distal end, a first clamping channel 110 and a proximal end. The basket wire 500 and the traction wire 300 are sequentially inserted into the first clamping channel 110 from the distal end to the proximal end. The ends of the basket wire and the traction wire 300 that are close to each other are connected by the second connector 400. The first connector 600 is connected to the end of the basket wire away from the proximal end, and the first connector 600 is located outside the sheath tube 100. The first connector 600 has a second guide wire guide hole 610 for inserting the visible guide wire. The wall of the second guide wire guide hole 610 has a third side opening 620, which penetrates the outer wall of the first connector 600 and extends from the end face of one end of the second guide wire guide hole 610 to the end face of the other end, so that the wall of the second guide wire guide hole 610 forms a non-closed structure.

[0124] It should be noted that in existing basket-type catheters, the guidewire channel is not located within the sheath 100, but rather a through-hole is provided in the first connector 600 or a similar location, allowing the guidewire to enter through the through-hole from the proximal end of the guidewire for positioning. The principle of this implementation is similar to that of having the guidewire channel within the sheath 100, and neither can be adapted to a visible guidewire. In this embodiment, the first connector 600 is modified to achieve the effect of adapting to a visible guidewire. Similar to the preceding description, this embodiment uses a basket-type catheter as an example, but does not mean it is only applicable to basket-type catheters. Any catheter with a first connector 600 structure and a through-hole for positioning the guidewire, where the through-hole cannot allow the proximal end of the visible guidewire to pass through, should be within the scope of this application.

[0125] In these embodiments, because the sheath 100 releases the basket wire 500 only after crossing the stone during stone removal or lithotripsy, although the significant difference between this system and conventional basket catheters is that the visible guidewire does not cross the stone, while the ordinary guidewire does, this inherently provides better insertion performance during stone crossing.

[0126] However, when the adapter 200 is fixed at the distal end of the sheath 100, installing the adapter 200 too far forward during the process of crossing the stone will affect the passage of the sheath 100 across the stone.

[0127] For example, the first connector 600 has parallel second guide wire guide holes 610 and fastening holes 630. The fastening hole 630 is used to pass through and fix the end of the basket wire 500 away from the proximal end. Obviously, the end of the fastening hole 630 away from the proximal end can be closed or open, which is not specifically limited here. The second guide wire guide hole 610 is a cavity for passing through a visible guide wire, in which the visible guide wire can slide smoothly. In this example, the end of the second guide wire guide hole 610 away from the mounting hole 230 has a third side opening 620. The first connector 600 is made of an elastic material and can insert the visible guide wire by its own deformation.

[0128] For example, such as Figure 11 As shown, when the flexibility or elasticity of the first connector 600 is low and the third side opening 620 should be set to be wide, the visible guide wire can be directly installed into the second guide wire guide hole 610 from the side direction.

[0129] For example, such as Figure 12 As shown, the two ends of the third side opening 620 are misaligned, and the two ends of the third side opening 620 have overlapping portions when projected axially into the second guide wire guide hole 610.

[0130] By misaligning the two ends of the first side opening 210, the visual guide wire experiences more friction as it passes through the second guide wire guide hole 610 from the third side opening 620, thus securing the visual guide wire more firmly and increasing the difficulty of it detaching from the first guide wire guide hole 220. This is particularly useful for controlling the movement direction of the basket guide tube.

[0131] Because the two ends are misaligned and overlap in the axial direction, this forms a maze-like or locking structure, making it difficult for the guidewire to slip out from the first side opening 210, thus increasing safety. It should be noted that although the fixation ability is enhanced, because there is a certain overlap area at both ends, the doctor can still adjust the position of the visual guidewire by appropriate operation (such as rotation or slight pulling) to enter and exit the second guidewire guide hole 610.

[0132] Furthermore, the staggered design can accommodate visual guidewires of different diameters to some extent. Thinner guidewires may be easier to pass through, while thicker guidewires will encounter greater resistance during passage, but can still be effectively guided and secured.

[0133] For ease of understanding, the working principle of this embodiment is provided as follows:

[0134] Because the basket wire and the traction wire 300 are not fixed in either the axial or circumferential direction within the sheath 100, meaning there is room for movement, they exhibit the following behavior when subjected to external pressure: Figure 13 The first connector 600 is in a state where it does not protrude from the side of the sheath 100, so as to avoid affecting the movement of the sheath 100.

[0135] When it is necessary to insert the visual guide wire into the second guide wire guide hole 610, the first connector 600 can be moved circumferentially or a portion of the mesh wire can be extended to allow the visual guide wire to pass through the second guide wire guide hole 610, and the mesh basket will appear as follows: Figure 14 The sheath 100 remains in the state shown and is maintained during movement within the body or the forceps channel of other instruments. In this state, theoretically, the maximum radial dimension of the sheath 100 matches the above scheme. However, by extending part of the basket wire, the maximum radial dimension of the sheath 100 can be reduced. When the sheath reaches but does not cross the stone, since the visual guidewire in this system does not need to cross the stone, the visual guidewire disengages from the second guidewire guide hole 610. Under the pressure of the stone and the visceral wall, the basket presents as shown... Figure 15 In this state, it is easier to cross the stones.

[0136] like Figure 19 As shown, in some embodiments, the sheath 100 also has a second clamp channel 120, which extends in the same direction as the first clamp channel 110.

[0137] In this embodiment, the sheath 100 is introduced into the second clamp channel 120 for a separate cavity for the contents, which may be a visible guidewire.

[0138] For example, the cross-section of the second clamp 120 can be circular, elliptical, or flat. However, the basket still includes the adapter 200.

[0139] In clinical practice, the visual guidewire is first placed in the expected position, using its friction with the cavity to establish positioning. Various surgical procedures are then performed by guiding the catheter through the visual guidewire. However, if the visual guidewire slips after the catheter has been guided to the expected position, or if the visual guidewire needs to enter a deeper cavity but cannot achieve the expected path due to insufficient rigidity, the contents can be completely withdrawn, and the catheter can then enter through the second cavity 120. This allows the visual guidewire to re-enter the expected position under the guidance of the second cavity 120, or, because the circumferential movement space is constrained by the second cavity 120 (which is narrower than the body cavity), the visual guidewire, with its increased overall axial rigidity, can advance and form the expected path.

[0140] like Figure 16 As shown, in some embodiments, a channel tube 700 is fixedly connected to the outside of the sheath tube 100 to expand the uses of the basket, such as:

[0141] 1) When the stone is too large and the basket cannot cross and trap it, the laser fiber is delivered through the channel tube 700 to break the stone. After the stone is broken, it is removed with the basket.

[0142] 2) Infuse sterile water into the cavity;

[0143] 3) Administer hemostatic agents, etc.

[0144] like Figure 17 and Figure 18 As shown in some embodiments, in actual clinical practice, during bile duct stone removal, the basket needs to be pulled out entirely from the sphincter of Oddi. Since the stones may be large, the contents (e.g., the guidewire) may be pulled out along with the sphincter of Oddi. In cases of multiple stones, the contents need to re-enter the bile duct. Because the sphincter of Oddi has been cut by the sphincter incision knife, the basket can re-enter the sphincter under the action of the forceps, but the contents do not have the ability to actively re-enter the adapter 200, meaning they are difficult to follow the basket into the sphincter.

[0145] To solve the above problems, the distribution density of the adapter 200 at the distal end of the sheath 100 is increased or the adapter 200 is lengthened to increase the limiting length of the contents. This allows the contents to remain in the first guide wire guide hole 220 when the basket carrying the stone detaches from the duodenal papillary sphincter, so that they can re-enter the papillary sphincter with the basket.

[0146] It should be noted that the catheter provided in this application can also be used in other endoscopic instruments, such as baskets, balloons, etc.

[0147] In all examples shown and described herein, any specific values ​​should be interpreted as merely exemplary and not as limitations; therefore, other examples of exemplary embodiments may have different values.

[0148] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0149] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these modifications and improvements all fall within the protection scope of this application.

Claims

1. A catheter, characterized in that, The catheter includes: Sheath; An adapter has a first connecting portion and a second connecting portion. The first connecting portion has a first guide wire guide hole. The wall of the first guide wire guide hole has a first side opening. The first guide wire guide hole is used to pass through a visible guide wire. The first side opening penetrates the outer wall of the first connecting portion and extends from one end face of the first guide wire guide hole to the other end face, so that the wall of the first guide wire guide hole forms a non-closed structure. The second connecting portion is connected to the sheath. The width of the first side opening is smaller than the outer diameter of the visible guide wire, and at least one of the two ends of the first side opening is provided as an elastic structure.

2. The catheter according to claim 1, characterized in that, The number of adapters is multiple, and the multiple adapters are spaced apart along the axial direction of the sheath.

3. The catheter according to claim 1, characterized in that, The two ends of the first side opening are offset, and the two ends of the first side opening have overlapping portions when projected onto the axial direction of the first guide wire guide hole.

4. The catheter according to claim 1, characterized in that, The catheter also includes: A spreading tube is provided, wherein the spreading tube is configured as an elastic structure; wherein one end of the first side opening passes through a portion of the spreading tube, and the side of the other end of the first side opening abuts against the side wall of the spreading tube.

5. The catheter according to claim 1 or 2, characterized in that, The adapter and the sheath are detachably connected.

6. The catheter according to claim 1, characterized in that, The second connecting part has a mounting hole, which is arranged parallel to the first guide wire guide hole, and the sheath passes through the mounting hole; Wherein, the sheath tube and the mounting hole are interference-fitted; and / or, the sheath tube and the hole wall of the mounting hole are connected.

7. The catheter according to claim 6, characterized in that, The mounting hole has a second side opening in its wall, which penetrates the outer wall of the adapter and extends from one end face of the mounting hole to the other end face, so that the mounting hole wall forms a non-closed structure.

8. The catheter according to claim 6, characterized in that, The mounting hole has a second side opening in its wall, which communicates with the first guide wire guide hole. The second side opening extends from the end face of one end of the mounting hole to the end face of the other end, so that the wall of the mounting hole forms a non-closed structure.

9. The catheter according to claim 7 or 8, characterized in that, Both the first side opening and the second side opening extend axially along the sheath.

10. The catheter according to claim 1, characterized in that, The first side opening extends along the axial direction of the sheath. One end of the two opposite ends of the first side opening is provided with an adhesive part, which is bonded to the corresponding side of the sheath. The other end of the two opposite ends of the first side opening is connected to the corresponding side of the sheath.

11. The catheter according to claim 1, characterized in that, The first side opening extends along the axial direction of the sheath. One end of the opposite ends of the first side opening is fixedly connected to the corresponding side of the sheath, and the other end of the opposite ends of the first side opening is snapped or glued to the corresponding side of the sheath.

12. A net basket, characterized in that, The basket includes: The catheter as described in any one of claims 1 to 11; The sheath has a basket wire and a traction wire, and has a distal end, a first clamping channel and a proximal end. The basket wire and the traction wire are sequentially inserted into the first clamping channel from the distal end to the proximal end, and the basket wire and the traction wire are connected at their closest ends. A first connector is connected to the end of the basket wire away from the proximal end, and the first connector is located outside the sheath. The first connector has a second guide wire guide hole for inserting the visible guide wire. The wall of the second guide wire guide hole has a third side opening that penetrates the outer wall of the first connector and extends from the end face of one end of the second guide wire guide hole to the end face of the other end, so that the wall of the second guide wire guide hole forms a non-closed structure.

13. The basket according to claim 12, characterized in that, The sheath also has a second clamp channel, which extends in the same direction as the first clamp channel.

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