Catheter and mesh basket

Abstract

The invention provides a catheter and a mesh basket, and relates to the technical field of medical instruments. The catheter comprises a sheath tube and an adapter, the adapter is provided with a first connecting part and a second connecting part, the first connecting part is provided with a first guide wire guide hole, the hole wall of the first guide wire guide hole is provided with a first side opening, the first guide wire guide hole is used for allowing a visible guide wire to penetrate through, and the first side opening penetrates through the outer wall of the first connecting part; the first side opening extends from the end face of one end of the first guide wire guide hole to the end face of the other end of the first guide wire guide hole, so that the hole wall of the first guide wire guide hole forms a non-closed structure, and the second connecting part is connected with the sheathing canal; wherein the width of the first side opening is smaller than the outer diameter of the visible guide wire, and at least one side of the two ends of the first side opening is of an elastic structure. According to the catheter, the visual guide wire can penetrate into the catheter without being limited by the near-end connector, the visual guide wire can be used for guiding the catheter to conduct intubation, and the working efficiency is high.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and in particular to a catheter and a basket. Background Art

[0002] With the emergence of visual guidewires, the difficulty of ERCP surgery can be reduced. However, in the removal of stones or polyps in the body, since the proximal end of the visual guidewire has a proximal connector, the inner hole of the catheter of the conventional endoscopic instrument cannot pass through the visual guidewire. If there is no guidewire, the catheter can only cross the papilla and enter the bile duct with the help of the duodenoscope's clamp channel and lifting clamp as a guide, which is inefficient or cannot reach the expected position at all. Summary of the invention

[0003] In view of this, the purpose of the present application is to overcome the deficiencies in the prior art and to provide a catheter and a basket, wherein the insertion of the catheter into the visual guidewire is not restricted by the proximal connector, and the catheter can be intubated using the visual guidewire, thereby achieving high work efficiency.

[0004] This application provides the following technical solutions:

[0005] In a first aspect, an embodiment of the present application provides a catheter, the catheter comprising:

[0006] Sheath;

[0007] An adapter, the adapter having a first connecting part and a second connecting part, the first connecting part having a first guide wire guide hole, the hole wall of the first guide wire guide hole having a first side opening, the first guide wire guide hole being used to pass a visible guide wire, the first side opening penetrating the outer wall of the first connecting part, the first side opening extending from the end face of one end of the first guide wire guide hole to the end face of the other end so that the hole wall of the first guide wire guide hole forms a non-closed structure, and the second connecting part is connected to the sheath; wherein, 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 set as an elastic structure.

[0008] In some embodiments of the first aspect, there are multiple adapters, and the multiple adapters are arranged at intervals along the axial direction of the sheath tube.

[0009] In some embodiments of the first aspect, two ends of the first side opening are staggered, and projections of the two ends of the first side opening in the axial direction of the first guide wire guide hole have overlapping portions.

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

[0011] The expansion tube is configured as an elastic structure; wherein one end of the first side opening is penetrated through a partial area of ​​the expansion tube, and the side surface of the other end of the first side opening abuts against the side wall of the expansion 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, the mounting hole and the first guide wire guide hole are arranged in parallel, and the sheath tube is inserted into the mounting hole;

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

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

[0016] In some embodiments of the first aspect, the hole wall of the mounting hole has a second side opening, the second side opening is connected to the first guide wire guide hole, and the second side opening extends from the end surface of one end of the mounting hole to the end surface of the other end, so that the hole wall of the mounting hole forms a non-closed structure.

[0017] In some embodiments of the first aspect, the first side opening and the second side opening are both arranged to extend along the axial direction of the sheath tube.

[0018] In some embodiments of the first aspect, the first side opening is extended along the axial direction of the sheath tube, one of the two opposite ends of the first side opening is provided with a bonding portion, the bonding portion is bonded to the corresponding side of the sheath tube, and the other of the two opposite ends of the first side opening is connected to the corresponding side of the sheath tube.

[0019] In some embodiments of the first aspect, the first side opening is arranged to extend along the axial direction of the sheath tube, one of the two opposite ends of the first side opening is fixedly connected to the corresponding side of the sheath tube, and the other of the two opposite ends of the first side opening is clamped to the corresponding side of the sheath tube.

[0020] In a second aspect, the present application further provides a net basket, the net basket comprising:

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

[0022] The basket wire and the traction wire, the sheath has a distal end, a first clamp channel and a proximal end, the basket wire and the traction wire are sequentially inserted into the first clamp channel from the distal end to the proximal end, and the ends of the basket wire and the traction wire close to each other are connected.

[0023] A first connector, the first connector is connected to an 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, and the second guide wire guide hole is used to pass the visible guide wire; wherein, the hole wall of the second guide wire guide hole has a third side opening, the third side opening passes through the outer wall of the first connector, and the third side opening 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 hole 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, and the second clamp channel and the first clamp channel extend in the same direction.

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

[0026] The present application provides a catheter, which is additionally provided with an adapter, and the adapter has a first connecting portion and a second connecting portion. A first guide wire guide hole is provided on the first connecting portion, and a first side opening that runs through the entire length is provided on one side of the first guide wire guide hole, and it is ensured that the width of the first side opening is smaller than the outer diameter of the visible guide wire, and at least one end is made of elastic material, which not only ensures that the guide wire can be stably fixed, but also allows a larger proximal connector to pass through easily without obstruction. This special structure allows the visible guide wire to pass smoothly through the first guide wire guide hole from the first side opening on the side of the first connecting portion even in the presence of a larger proximal connector, and because the adapter is connected to the sheath of the catheter, the visible guide wire is equivalent to inserting the catheter.

[0027] Obviously, the present application not only solves the problem that the visual guidewire cannot be inserted into the catheter due to the proximal connector of the visual guidewire under the traditional method, but also helps to improve the overall work efficiency, allowing doctors to use the visual guidewire in conjunction with the catheter to complete related surgical steps more quickly and accurately.

[0028] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 A schematic structural diagram of a catheter provided by an embodiment of the present application is shown;

[0031] Figure 2 A schematic structural diagram of a catheter adapter according to an embodiment of the present application is shown;

[0032] Figure 3 A schematic structural diagram from another perspective of a first embodiment of a catheter adapter provided by an embodiment of the present application is shown;

[0033] Figure 4 A schematic structural diagram of a second embodiment of a catheter adapter provided by an embodiment of the present application is shown;

[0034] Figure 5 A schematic structural diagram of a catheter adapter according to a third embodiment of the present application is shown;

[0035] Figure 6 A structural schematic diagram showing a fourth perspective of a catheter adapter provided by an embodiment of the present application;

[0036] Figure 7 A schematic structural diagram showing a fifth aspect of a catheter adapter provided by an embodiment of the present application from one viewing angle;

[0037] Figure 8 A schematic structural diagram showing a sixth aspect of a catheter adapter provided by an embodiment of the present application from one viewing angle;

[0038] Fig. 9 A schematic structural diagram of a first connecting member of a catheter provided by an embodiment of the present application is shown from a perspective;

[0039] Fig.10 A schematic structural diagram from another perspective of a first embodiment of a catheter adapter provided by an embodiment of the present application is shown;

[0040] Fig.11 A schematic structural diagram of a second embodiment of a catheter adapter provided by an embodiment of the present application is shown;

[0041] Fig.12A schematic structural diagram of a catheter adapter according to a third embodiment of the present application is shown;

[0042] Fig.13 A schematic diagram of the structure of a catheter in a first state provided by an embodiment of the present application is shown;

[0043] Fig.14 A schematic diagram of the second state structure of a catheter provided by an embodiment of the present application is shown;

[0044] Fig.15 A schematic diagram of the structure of a catheter in a third state provided by an embodiment of the present application is shown;

[0045] Fig.16 A schematic structural diagram of a catheter provided by another embodiment of the present application is shown;

[0046] Fig.17 A schematic structural diagram of a catheter provided in yet another embodiment of the present application is shown;

[0047] Fig.18 A schematic structural diagram of a catheter provided in yet another embodiment of the present application is shown;

[0048] Fig.19 A schematic structural diagram of a sheath tube of a catheter provided in yet another embodiment of the present application is shown.

[0049] Description of main component symbols:

[0050] 100-sheath; 110-first clamp channel; 120-second clamp 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 connecting piece; 500-basket wire; 600-first connecting piece; 610-second guide wire guide hole; 620-third side opening; 630-fastening hole; 700-channel tube. DETAILED DESCRIPTION

[0051] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0052] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. In contrast, when an element is referred to as being "directly on" another element, there is no intermediate element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0053] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0054] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0055] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of the template are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0056] In the related technologies, bile and pancreatic diseases are common clinical diseases, among which endoscopic treatment, especially endoscopic retrograde cholangiopancreatography (ERCP) is a common method. During the ERCP procedure, X-rays are required for auxiliary observation, which obviously causes the problem of radiation exposure to doctors and patients, as well as the problem of slow recovery caused by the infiltration or retention of contrast agents in the patient's bile duct.

[0057] With the emergence of visual guidewires, the difficulty of ERCP surgery and the impact of X-rays can be reduced. However, in the removal of stones or polyps in the body, since the proximal end of the visual guidewire has a proximal connector, there is an inner hole of the catheter that cannot be passed through. If there is no guidewire, the catheter can only cross the papilla and enter the bile duct with the help of the duodenoscope's clamp channel and lifting clamp as a guide, which is inefficient or cannot reach the expected position at all.

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

[0059] In these embodiments, an improved catheter design is provided, which is particularly suitable for endoscopic retrograde cholangiopancreatography (ERCP) surgery. Through this new design, the problem existing in the prior art can be effectively solved, that is, when a visual guide wire is used for guidance, the connector at the proximal end of the guide wire is large, which makes it difficult for a standard catheter to pass through.

[0060] The catheter includes a special adapter 200, which has two key parts, namely a first connection part and a second connection part. The first connection part is provided with a first guide wire guide hole 220 having a first side opening 210. This special structure allows the visible guide wire to smoothly pass through the first guide wire guide hole 220 from the first side opening 210 on the side of the first connection part even in the presence of a larger proximal connector, and because the adapter 200 is connected to the sheath 100 of the catheter, the visible guide wire is equivalent to being inserted into the catheter.

[0061] Furthermore, by setting the first guide wire guide hole 220 to a non-closed state, that is, a first side opening 210 is provided on one side of the first guide wire guide hole 220 that runs through the entire length, and ensuring that the width of the first side opening 210 is smaller than the outer diameter of the visible guide wire, and at least one end is made of elastic material, this ensures that the guide wire can be stably fixed and allows it to easily pass through a larger proximal connector without obstruction. Of course, in other embodiments, both ends of the first side opening 210 can also be set as elastic structures. Alternatively, the adapter 200 is provided with an elastic member as a whole.

[0062] For example, in this embodiment, the extension path of the first side opening 210 is parallel to the axial direction of the sheath tube 100. Of course, in other embodiments, the extension path of the first side opening 210 can be set to extend obliquely, and if the visual guide wire needs 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 inclination angle relative to the axis of the sheath tube 100.

[0063] Alternatively, the extension path of the first side opening 210 can be set to extend in a curve. For some complex cases, it may be necessary to more flexibly control the position of the visual guidewire. In this case, it may be considered to allow the first side opening 210 to extend along a curved path. Such a design allows the guidewire to better fit 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 sections, for example, the first section is straight and then turns to an oblique direction or a curve, so that the initial insertion can be smooth 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 is conducive to increasing the operating space and reducing the interference of the sheath 100 on the path of the operating visible guide wire entering the first guide wire guide hole 220.

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

[0067] In some embodiments, there are multiple adapters 200 , and the multiple adapters 200 are arranged at intervals along the axial direction of the sheath tube 100 .

[0068] In these embodiments, in order to further enhance the flexibility and adaptability of the catheter, multiple adapters 200 may be designed to be spaced apart along the axial direction of the sheath tube 100. Such a design can increase the operational flexibility, and multiple adapters 200 are distributed on the catheter, so that the visual guidewire can be close to the catheter at different positions, thereby facilitating the control of the catheter to move along the visual guidewire and reducing the movement resistance.

[0069] In short, by providing multiple adapters 200, the catheter can be guided and supported at different positions to ensure that it maintains the correct path throughout the operation. This is particularly important for operations that require precise control of the catheter's direction.

[0070] Furthermore, the presence of multiple adapters 200 can disperse stress and reduce the burden on a single connection point, 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 is provided every a certain length.

[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, and so on.

[0073] like Figure 2 and Figure 3 As shown, in some embodiments, the two ends of the first side opening 210 are staggered, and the projections of the two ends of the first side opening 210 in the axial direction of the first guide wire guide hole 220 have overlapping parts.

[0074] In these embodiments, by staggering the two ends of the first side opening 210, the visual guide wire can be subjected to more restraining force when passing through the first side opening 210 from the first guide wire guide hole 220, thereby more firmly fixing the visual guide wire and increasing the difficulty of the visual guide wire escaping from the first guide wire guide hole 220. This is particularly useful for controlling the moving direction of the catheter.

[0075] Among them, since the two ends are misaligned and have overlapping parts in the axial direction, a structure similar to a "maze" or "lock" is formed, making it difficult for the guide wire to slip out of the first side opening 210, thereby increasing safety. It should be noted that although the fixing ability is enhanced, because there is a certain overlapping area at the two ends, the doctor can still adjust the position of the visual guide wire through appropriate operations (such as rotation or slight pulling) to enter and exit the first guide wire guide hole 220.

[0076] Moreover, the staggered design can accommodate visual guidewires of different diameters to a certain extent. A thinner guidewire may be easier to pass through, while a thicker guidewire will encounter greater resistance during the passage, but can still be effectively guided and fixed.

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

[0078] To further optimize this design, an elastic material may be used at one or both ends of the dislocated opening so that when the visual guide wire passes through, the elastic material can provide sufficient pressure to fix the visual guide wire while allowing appropriate deformation to facilitate smooth passage of the visual guide wire.

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

[0080] In these embodiments, the catheter also includes a spread tube, which is designed as an elastic structure, that is, the spread tube can be elastically deformed. This design further enhances the functionality and operational flexibility of the adapter 200. Specifically, the main function of the spread tube is to help the first guide wire guide hole 220 to be better unfolded, that is, it is conducive to expanding the first side opening 210. One end of the first side opening 210 is inserted into a partial area of ​​the spread tube, that is, the length of one end of the first side opening 210 inserted into the spread tube is less than the length of the spread tube. The other end of the second side opening 240 abuts the side wall of the spread tube, that is, the spread tube is not penetrated. For ease of description, the first side opening 210 has a first end and a second end, the first end is penetrated into one end of the spread tube, and the side wall of the other end of the spread tube abuts the side wall of the second end. When in use, there is no object inside the portion where the second end of the expansion tube and the second side opening 240 abut against each other, that is, the rigidity of this portion is relatively low, and the expansion tube and the second side opening 240 can be lifted up to form a gap between the first end and the second end of the first side opening 210 that is greater than or equal to the wall thickness of the expansion tube, so that the expansion tube can be more easily passed over and fixed on the visual guide wire. After the connection between the two is completed, the expansion tube can be removed.

[0081] Optionally, a guide angle is provided on the end surface of the expansion tube abutting against the second end of the second side opening 240, so as to facilitate the visible guide wire to pass through the gap between the first end and the second end (ie, 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 material. Of course, in other embodiments, the material of the expansion tube can also be set to 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 the sheath 100 are designed to be detachably connected. This design provides greater flexibility and convenience, especially when it is necessary to replace different types of adapters 200 or maintain the catheter. In other words, the doctor can choose the appropriate type of adapter 200 according to the specific needs of the catheter for the operation, such as first guide wire guide holes 220 of different sizes, different first side openings 210 designs, etc. In addition, the detachable design allows each component to be thoroughly cleaned and disinfected separately, which helps reduce the risk of infection.

[0085] Furthermore, by configuring the adapter 200 and the sheath 100 as a split structure, when using a common guidewire (non-visual guidewire), since the common guidewire does not have a proximal connector, there is no need to use the adapter 200 and there is no need to redesign the catheter for the visual guidewire.

[0086] Exemplarily, the adapter 200 and the sheath tube 100 are connected by a snap-fit ​​connection. The adapter 200 and the sheath tube 100 are provided with snap-fit ​​structures that cooperate with each other, and the connection or separation can be completed by pressing or rotating.

[0087] Alternatively, the adapter 200 and the sheath tube 100 are connected by a latch, and corresponding holes are provided on the adapter 200 and the sheath tube 100, and the connection is 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 is passed 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.

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

[0090] Interference fit: Interference fit means that the slightly larger sheath tube 100 is pressed into the slightly smaller mounting hole 230, and the elastic deformation of the material is used to achieve a tight connection. No additional fasteners or adhesives are required, and the sheath tube 100 is easy to disassemble and assemble.

[0091] It should be noted that the sheath tube 100 and the mounting hole 230 are set to an interference fit or a transition fit, so that after the sheath tube 100 is inserted into the mounting hole 230, the adapter 200 can be moved along the sheath tube 100, and then the position of the adapter 200 on the sheath tube 100 can be adjusted, so that multiple adapters 200 can be dispersed at preset positions on the sheath tube 100, and the distance between adjacent adapters 200 is kept in accordance with the requirements. However, in order to strengthen the insurance, the adapter 200 can be strengthened and fixed by applying glue or dispensing glue after the position of the adapter 200 on the sheath tube 100 is adjusted. Of course, it is also possible to limit the position by setting a locking screw, etc., which is not specifically limited here.

[0092] Bonding: Bonding is done by using a medical grade adhesive to secure the sheath 100 and the wall of the mounting hole 230 together. Adhesives can provide a very strong connection and are suitable for high stress applications. Simply apply an appropriate amount of adhesive and wait for it to cure. Can fill small gaps: For applications where dimensional tolerances are not so strict, adhesives can fill small gaps and improve overall stability.

[0093] Exemplarily, an adhesive suitable for medical applications is selected, such as epoxy, cyanoacrylate (super glue), etc.

[0094] The combined use of interference fit and bonding combines the advantages of interference fit and bonding, providing double security. 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 performed to ensure a basic mechanical connection. Then a small amount of adhesive is applied to the contact surface to further strengthen the connection. In order to ensure the effect of the interference fit, the dimensional tolerance of the outer diameter of the sheath tube 100 and the inner diameter of the mounting hole 230 needs to be accurately controlled. Generally, the interference amount should be between 0.05 mm and 0.15 mm, and the specific value depends 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 tube 100 must be very firm to ensure that it will not loosen during operation. By combining interference fit and bonding, it can be ensured that even under high stress, the sheath tube 100 and the adapter 200 will not separate or move relative to each other, thereby ensuring the normal movement of the sheath tube 100.

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

[0098] First, a plurality of adapters 200 are sequentially mounted on the sheath tube 100 , and then the position of the adapter 200 on the sheath tube 100 is adjusted and fixed, and finally, the side of the self-visible guide wire is inserted into the first guide wire guide hole 220 .

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

[0100] In these embodiments, the hole wall of the mounting hole 230 has a second side opening 240, which penetrates the outer wall of the adapter 200 and extends from one end of the mounting hole 230 to the other end. This design makes the hole wall of the mounting hole 230 form a non-closed structure. Obviously, the presence of the second side opening 240 allows the sheath tube 100 to be more easily inserted into or removed from the mounting hole 230, especially when the sheath tube 100 needs to be quickly disassembled. This design simplifies the assembly process and improves operating efficiency.

[0101] Secondly, the non-closed structure of the hole wall of the mounting hole 230 can ensure a tight fit between the sheath tube 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 recovery, such as silicone, polyurethane, etc. These materials can deform after being subjected to force, and can also recover to their original shape, ensuring stable fixation of the sheath 100. In addition, if higher mechanical strength is required, a plastic or metal material with a certain elasticity, such as nylon, stainless steel, etc., 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 tube 100 to ensure that after the sheath tube 100 is inserted, the hole wall can exert a certain pressure on the sheath tube 100, thereby achieving a stable connection, that is, it can increase the difficulty of the sheath tube 100 being separated from the mounting hole 230. In other words, the normal operation during the operation cannot separate the sheath tube 100 from the mounting hole 230, and it can only be separated by applying external force manually.

[0104] For example, a small protrusion or groove is provided on the edge of the second side opening 240 to increase friction and prevent the sheath tube 100 from sliding.

[0105] For example, elastic buckles are provided at both ends of the second side opening 240 , and when the sheath tube 100 is inserted, the buckles are automatically locked to provide additional fixing force.

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

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

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

[0109] In these embodiments, the hole wall of the mounting hole 230 has a second side opening 240, and the second side opening 240 is connected to the first guide wire guide hole 220. The second side opening 240 extends from one end of the mounting hole 230 to the other end, so that the hole wall of the mounting hole 230 forms a non-closed structure. Since the second side opening 240 is connected to the first guide wire guide hole 220, the visual guide wire can enter or exit the first guide wire guide hole 220 through this first side opening 210, and the sheath tube 100 can also enter and exit the mounting hole 230 from the first side opening 210.

[0110] Obviously, the above arrangement reduces the distance between the visible guidewire and the sheath 100 while ensuring that the visible guidewire can move along the first guidewire guide hole 220, which is conducive to movement in a narrow cavity, and allows the doctor 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 extended along the axial direction of the sheath tube 100 .

[0112] In these embodiments, the first side opening 210 and the second side opening 240 are both extended along the axial direction of the sheath tube 100, which makes the insertion direction of the visual guide wire and the sheath tube 100 consistent, simplifying the operation process. This consistency helps to reduce errors in operation. The axially extended design can make the visual guide wire and the sheath tube 100 receive uniform pressure distribution when passing through the hole, thereby improving their stability in the hole. In addition, the visual guide wire and the sheath tube 100 will not produce unnecessary bending or distortion due to changes in the position or direction of the opening.

[0113] Furthermore, the design of the opening extending in the axial direction is relatively simple and can be easily manufactured by injection molding or machining. During the assembly process, the guide wire and the sheath tube 100 can be inserted more smoothly, reducing the difficulty of assembly. The axial extension design can maximize the use of the space of the adapter 200 and avoid space waste caused by inconsistent opening positions. This design can make the entire system more compact, reduce the overall size, and improve operational flexibility.

[0114] like Figure 8 As shown, in some embodiments, the first side opening 210 is extended along the axial direction of the sheath tube 100, and a bonding portion 250 is provided at one of the two opposite ends of the first side opening 210, the bonding portion 250 is bonded to the corresponding side of the sheath tube 100, and the other end of the two opposite ends of the first side opening 210 is connected to the corresponding side of the sheath tube 100.

[0115] In these embodiments, one of the two opposite ends of the first side opening 210 is provided with a bonding portion 250, which is bonded to the corresponding side of the sheath tube 100, while the other opposite end of the first side opening 210 is connected to the corresponding side of the sheath tube 100 by other means.

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

[0117] The other end of the first side opening 210 can be connected by other means, such as elastic structure, buckle, bonding, etc. Bonding is a simple and reliable connection method, which is easy to implement in the manufacturing process. By combining the bonding portion 250 with another connection method, the assembly process can be simplified and the work efficiency can be improved.

[0118] Exemplarily, the bonding portion 250 uses a medical-grade adhesive layer, such as an epoxy resin layer, a cyanoacrylate layer, a tearable adhesive layer, etc. These adhesive layers have good biocompatibility and bonding strength. It should be noted that the size of the bonding portion 250 should be large enough to ensure sufficient bonding area, thereby providing sufficient fixing force.

[0119] In some embodiments, the first side opening 210 is extended along the axial direction of the sheath tube 100, one of the two opposite ends of the first side opening 210 is fixedly connected to the corresponding side of the sheath tube 100, and the other of the two opposite ends of the first side opening 210 is clamped or bonded to the corresponding side of the sheath tube 100.

[0120] In these embodiments, one of the two opposite ends of the first side opening 210 is fixedly connected to the corresponding side of the sheath tube 100, and the other end is connected to the corresponding side of the sheath tube 100 by a clamping method. This design combines the stability of a fixed connection with the flexibility of a clamping or bonding connection, providing a more optimized operating experience and higher reliability.

[0121] One end of the first side opening 210 can be fixedly connected to the sheath tube 100 by welding (such as ultrasonic welding, laser welding) or using a medical grade adhesive (such as epoxy resin, cyanoacrylate). The other end of the first side opening 210 can be provided with an elastic buckle structure, which can cooperate with a corresponding notch or protrusion on the sheath tube 100 to form a detachable but stable connection. For example, a small hole or groove can be provided on the sheath tube 100, and a corresponding latch can be provided at the other end of the first side opening 210, which is locked by rotation or other means after insertion.

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

[0123] like Figure 1 , Fig. 9 and Fig.10 As shown, in some embodiments, the present application also provides a basket, the basket includes a catheter, a basket wire 500, a traction wire 300, a first connecting piece 600 and a second connecting piece 400, the sheath 100 has a distal end, a first clamp channel 110 and a proximal end, the basket wire 500 and the traction wire 300 are sequentially inserted into the first clamp channel 110 from the distal end to the proximal end, and the ends of the basket wire and the traction wire 300 that are close to each other are connected by the second connecting piece 400. The first connecting member 600 is connected to the end of the basket wire away from the proximal end, and the first connecting member 600 is located outside the sheath 100, and the first connecting member 600 has a second guide wire guide hole 610, and the second guide wire guide hole 610 is used to pass the visible guide wire; wherein, the hole wall of the second guide wire guide hole 610 has a third side opening 620, and the third side opening 620 passes through the outer wall of the first connecting member 600, and the third side opening 620 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 hole wall of the second guide wire guide hole 610 forms a non-closed structure.

[0124] It should be noted that the guidewire channel of the existing basket-type catheters as described above is not located in the sheath 100, but a through hole is set in the first connecting piece 600 or a similar position, so that the guidewire can enter the above-mentioned through hole from the proximal end of the guidewire to obtain positioning. The principle of this implementation method is similar to the method in which the guidewire channel is located in the sheath 100, and both cannot be adapted to a visual guidewire. In this embodiment, the first connecting piece 600 is modified to achieve the effect of adapting to a visual guidewire. Similar to the previous description, this embodiment cites a basket-type catheter for illustration, which does not mean that it is only applicable to the basket. Those having a first connecting piece 600 structure and having a through hole for positioning the guidewire inside it, and the above-mentioned through hole cannot allow the proximal end of the visual guidewire to pass through, should all be within the scope of the present application.

[0125] In these embodiments, because when performing stone removal or lithotripsy, the sheath 100 releases the basket wire 500 only after crossing the stone. Although compared with the traditional basket catheter, the significant difference of the present system is that the visible guide wire will not cross the stone, while the ordinary guide wire will cross the stone, which can inherently provide better insertion performance in the process of crossing the stone.

[0126] However, when the adapter 200 is fixed at the distal end of the sheath tube 100 , during the process of crossing stones, the adapter 200 installed too far forward will affect the passability of the sheath tube 100 in crossing stones.

[0127] Exemplarily, the first connector 600 has a second guide wire guide hole 610 and a fastening hole 630 in parallel. 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 a visual guide wire, in which the visual guide wire can slide smoothly. In this example, the end of the second guide wire guide hole 610 away from the mounting hole 230 is provided with a third side opening 620, and the first connector 600 is made of an elastic material, and the visual guide wire can be inserted by its own deformation.

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

[0129] For example, Fig.12 As shown, the two ends of the third side opening 620 are staggered, and the projections of the two ends of the third side opening 620 in the axial direction of the second guide wire guide hole 610 have overlapping parts.

[0130] By staggering the two ends of the first side opening 210, the visual guide wire can be subjected to more friction when passing through the second guide wire guide hole 610 from the third side opening 620, thereby more firmly fixing the visual guide wire and increasing the difficulty of the visual guide wire escaping from the first guide wire guide hole 220. This is particularly useful for controlling the moving direction of the basket catheter.

[0131] Among them, since the two ends are misaligned and have overlapping parts in the axial direction, a structure similar to a "maze" or "lock" is formed, making it difficult for the guide wire to slip out of the first side opening 210, thereby increasing safety. It should be noted that although the fixing ability is enhanced, because there is a certain overlapping area at the two ends, the doctor can still adjust the position of the visual guide wire through appropriate operations (such as rotation or slight pulling) to enter and exit the second guide wire guide hole 610.

[0132] Moreover, the staggered design can accommodate visual guidewires of different diameters to a certain extent. A thinner guidewire may be easier to pass through, while a thicker guidewire will encounter greater resistance during the passage, but can still be effectively guided and fixed.

[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 the sheath tube 100 in either the axial or circumferential direction, that is, there is room for movement, when subjected to external pressure, they appear as follows Fig.13 , that is, the first connecting member 600 does not protrude from the side of the sheath tube 100, so as to avoid affecting the movement of the sheath tube 100.

[0135] When it is necessary to pass the visual guide wire through the second guide wire guide hole 610, the first connecting member 600 can be moved circumferentially or a portion of the net basket wire can be extended to allow the visual guide wire to pass through the second guide wire guide hole 610. Fig.14 The state shown in the figure is maintained when the sheath 100 moves in the body or in the clamp channel of other instruments. In this state, the maximum radial dimension of the sheath 100 is theoretically consistent with the above scheme, but the maximum radial dimension of the sheath 100 can be reduced by extending part of the basket wire. When the stone is reached but not crossed, since the visual guide wire does not need to cross the stone in this system, the visual guide wire is separated from the second guide wire guide hole 610. Under the pressure of the stone and the visceral wall, the basket appears as follows Fig.15 state, it is easier to cross the stones.

[0136] like Fig.19 As shown, in some embodiments, the sheath 100 further has a second clamp channel 120 , and the second clamp channel 120 and the first clamp channel 110 are arranged to extend in the same direction.

[0137] In this embodiment, the sheath 100 introduces a second forceps channel 120, which is a separate lumen for the contents, and the contents may be a visual guidewire.

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

[0139] In clinical practice, the visual guidewire is first placed at the expected position, and the friction between the guidewire and the cavity is used to form a positioning, and various surgical operations are performed by guiding the catheter through the visual guidewire. However, once the catheter has been guided to the expected position by the visual guidewire and the visual guidewire slips, or the visual guidewire needs to enter a deeper cavity and cannot achieve the expected path due to insufficient rigidity, etc., the contents can be completely extracted and then enter through the second cavity 120, so that the visual guidewire can enter the expected position again through the guidance of the second cavity 120 of the catheter, or the visual guidewire, which has increased overall axial rigidity and has limited circumferential movement space in the circumferential direction compared to the human body cavity, can move forward and form the expected path.

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

[0141] 1) When the stone is too large to be covered by the basket, the channel tube 700 delivers the laser optical fiber to break the stone, and the stone is broken and then taken out with the basket;

[0142] 2) Input sterile water to expand the cavity;

[0143] 3) Input of blood to stop bleeding, etc.

[0144] like Fig.17 and Fig.18 As shown, in some embodiments, in actual clinical practice, when taking stones from the bile duct, the basket needs to be pulled out of the papillary sphincter as a whole, and the stones may be large, and the contents (such as a visual guide wire) may be pulled out together in the process of pulling out the papillary sphincter, and in the case of multiple stones, the contents need to enter the bile duct again. Since the papillary sphincter has been cut by the papillotomy knife, the basket can enter the nipple again under the action of the lifting forceps, but the contents do not have the ability to actively enter the adapter 200 again, that is, it is difficult to follow the basket into the nipple.

[0145] In order to solve the above problem, 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, so that when the basket carrying the stone is separated from the duodenal papillary sphincter, the passively dislodged contents are still retained in the first guide wire guide hole 220 and can re-enter the papillary sphincter with the basket.

[0146] It should be noted that the catheter provided in this application can also be applied to 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 limiting, and thus other examples of the exemplary embodiments may have different values.

[0148] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0149] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application.

Claims

1. A catheter, characterized in that: The catheter comprises: Sheath; An adapter, the adapter having a first connecting part and a second connecting part, the first connecting part having a first guide wire guide hole, the hole wall of the first guide wire guide hole having a first side opening, the first guide wire guide hole being used to pass a visible guide wire, the first side opening penetrating the outer wall of the first connecting part, the first side opening extending from the end face of one end of the first guide wire guide hole to the end face of the other end so that the hole wall of the first guide wire guide hole forms a non-closed structure, and the second connecting part is connected to the sheath; wherein, 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 set as an elastic structure.

2. The catheter according to claim 1, characterized in that There are multiple adapters, and the multiple adapters are arranged at intervals along the axial direction of the sheath tube.

3. The catheter according to claim 1, characterized in that The two ends of the first side opening are staggered, and the projections of the two ends of the first side opening in the axial direction of the first guide wire guide hole have overlapping parts.

4. The catheter according to claim 1, characterized in that The catheter further comprises: The expansion tube is configured as an elastic structure; wherein one end of the first side opening is penetrated through a partial area of ​​the expansion tube, and the side surface of the other end of the first side opening abuts against the side wall of the expansion 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 portion has a mounting hole, the mounting hole is arranged in parallel with the first guide wire guide hole, and the sheath tube is passed through the mounting hole; Wherein, the sheath tube and the mounting hole are interference fit; and / or, the sheath tube is connected to the hole wall of the mounting hole.

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

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

9. The catheter according to claim 7 or 8, characterized in that The first side opening and the second side opening are both extended along the axial direction of the sheath tube.

10. The catheter according to claim 1, characterized in that The first side opening is extended along the axial direction of the sheath tube, and one of the two opposite ends of the first side opening is provided with a bonding portion, the bonding portion is bonded to the corresponding side of the sheath tube, and the other end of the two opposite ends of the first side opening is connected to the corresponding side of the sheath tube.

11. The catheter according to claim 1, characterized in that The first side opening is extended along the axial direction of the sheath tube, one end of the opposite ends of the first side opening is fixedly connected to the corresponding side of the sheath tube, and the other end of the opposite ends of the first side opening is clamped or bonded to the corresponding side of the sheath tube.

12. A mesh basket, characterized in that: The basket comprises: A catheter as claimed in any one of claims 1 to 11; A basket wire and a traction wire, wherein the sheath tube has a distal end, a first clamp channel and a proximal end, the basket wire and the traction wire are sequentially inserted into the first clamp channel from the distal end to the proximal end, and the ends of the basket wire and the traction wire close to each other are connected; A first connector, the first connector is connected to an 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, and the second guide wire guide hole is used to pass the visible guide wire; wherein, the hole wall of the second guide wire guide hole has a third side opening, the third side opening passes through the outer wall of the first connector, and the third side opening 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 hole 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 tube further has a second clamp channel, and the second clamp channel and the first clamp channel are arranged to extend in the same direction.

Images