Guide structure, ureter sheath and ureter insertion device

Abstract

The invention discloses a guiding structure, a ureter sheath and a ureter insertion device, and relates to the technical field of medical instruments.The guiding structure comprises an outer pipe body, an inner pipe body and a spiral pipe, the inner pipe body is arranged on the inner wall of the outer pipe body, and a guiding channel is axially formed in the inner pipe body; the spiral pipe is spirally wound between the outer pipe body and the inner pipe body in the axis direction. The spiral pipe further comprises a reinforcing wire body, the reinforcing wire body shuttles inside and outside through gaps of at least part of the spiral sections in the axis direction of the outer pipe body, and at least part of an inner penetrating section, located on the inner side of the spiral pipe, of the reinforcing wire body is fixedly arranged in the inner pipe body in a penetrating mode. Compared with the prior art, the inner tube body can be effectively prevented from generating a bulge phenomenon, and an instrument can be inserted into the guide channel more smoothly.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly to a guiding structure, a ureteral sheath and a ureteral insertion device. Background Art

[0002] A ureteral sheath is a medical device widely used in urological surgeries, usually composed of an outer tube body, an intermediate layer spiral tube (also called a spring tube) and an inner tube body. The design of this device aims to provide a certain supporting force to establish a passage for an endoscope and other instruments to enter the urinary tract, enabling the urethral catheter to be smoothly introduced into the ureter.

[0003] Through long-term practice, the inventor found that during the surgery, the inner tube body of the ureteral sheath often bulges, which in turn affects the smoothness of instrument insertion. Summary of the Invention

[0004] The present invention discloses a guiding structure, a ureteral sheath and a ureteral insertion device to solve the technical problem that the ureteral sheath in the related art affects the smoothness of instrument insertion.

[0005] To solve the above problems, the present invention adopts the following technical solutions: In a first aspect, the present invention provides a guiding structure for a ureteral sheath, including an outer tube body, an inner tube body and a spiral tube. The inner tube body is arranged on the inner wall of the outer tube body. An axial guiding channel is arranged in the inner tube body. The spiral tube is spirally wound between the outer tube body and the inner tube body along the axial direction. It further includes a reinforcing wire body. Along the axial direction of the outer tube body, the reinforcing wire body shuttles inside and outside through at least part of the gaps between the spiral segments, and at least part of the inner penetrating section of the reinforcing wire body located inside the spiral tube is fixedly arranged in the inner tube body.

[0006] Preferably, the outer tube body or the inner tube body has a filling part, and the filling part is fitted into the gap between adjacent spiral segments of the spiral tube.

[0007] Preferably, when the filling part of the inner tube body is fitted into the gap between adjacent spiral segments, at least part of the outer penetrating section of the reinforcing wire body located outside the spiral tube is fixedly arranged in the outer tube body.

[0008] Preferably, when the filling part of the outer tube body is fitted into the gap between adjacent spiral segments, the inner wall surface of the outer tube body is concaved outward to form a groove for accommodating the spiral segment and the reinforcing wire body. One side of the reinforcing wire body is attached to the inner wall of the groove, and the other side is attached to the spiral segment.

[0009] Preferably, the filling part and the adjacent spiral segments are bonded by a biocompatible adhesive or connected by heat fusion.

[0010] Preferably, the corner portion of the reinforcement wire body is in contact with the spiral tube.

[0011] Preferably, both ends of the reinforcement wire body are provided with limiting sub-segments. After the reinforcement wire body shuttles in and out of the gap of at least part of the spiral segment, the limiting sub-segment overlaps with the spiral segment at the outermost end of the spiral tube to limit the radial position of the spiral segment.

[0012] Preferably, the limiting sub-segment is vertically bent from below or above the outermost spiral segment on the spiral tube to the side of the corresponding spiral segment, and then bent in the opposite direction and overlapped with the upper end or lower end of the corresponding spiral segment.

[0013] In a second aspect, the present invention provides a ureteral sheath comprising the guiding structure described in any of the above schemes.

[0014] In a third aspect, the present invention provides a ureteral insertion device, comprising the above-mentioned guiding structure or the above-mentioned ureteral sheath.

[0015] The technical solution adopted by the present invention can achieve the following beneficial effects: 1. By adding reinforcing wires, filling parts, and limiting sub-segments to the guide structure, the stability of the inner and outer tubes of the ureteral sheath can be significantly improved, and the separation or bulging between the inner and outer tubes can be prevented. The traction of the reinforcing wires and the radial position limitation of the limiting sub-segments effectively prevent the connection surface between the spiral tube and the inner and outer tubes from peeling off due to uneven force during use or changes in the pitch of the spiral tube. The combination of the reinforcing wires and the spiral segments and the supporting effect of the filling parts ensure that even if the inner and outer tubes are partially peeled off, the structural integrity can be maintained, avoiding the separation from further expanding into bulging, thereby improving the reliability and service life of the product; in this way, when inserting instruments into the guide cavity, it can be smoother because there is no bulging; 2. The design of the filling part enables the gap between adjacent segments of the spiral tube to be precisely controlled, thereby effectively preventing the pitch of the spiral tube from changing due to forward and backward displacement during use. By fitting the filling part into the gap between the spiral segments, the stability of the spiral tube in the axial and radial directions can be ensured, and uneven connection of the inner and outer tube bodies and loose structure due to pitch changes can be avoided. This design effectively suppresses the shear force caused by pitch changes, thereby avoiding the potential risk of delamination and uneven connection of the inner and outer tube bodies. In this way, the service life of the ureteral guide sheath can be extended and its reliability in medical surgery can be improved; 3. In the design of the reinforcement wire and spiral tube structure, especially considering the difference in thermal expansion coefficients, by adding a close fit between the inner and outer tubes and the reinforcement wire in the structure, the peeling or bulging of the inner and outer tubes caused by different thermal expansion can be reduced when the temperature changes. The difference in thermal expansion coefficients of the metal and glue bonding surface of the spiral tube and the cladding body is effectively controlled. The design ensures that even under long-term use or large temperature fluctuations, the guide structure can still maintain its stability and prevent deformation, peeling or bulging caused by inconsistent thermal expansion. The traction effect of the reinforcement wire and the mechanical locking between the structures ensure the stability and safety of the inner and outer tubes in various environments, thereby improving the application effect of the guide structure in clinical practice. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 is a schematic diagram of a partial structure of an embodiment of the present application for illustrating a guide structure; Figure 2 is a partial cross-sectional view of an embodiment of the present application for showing the interior of the guide structure; Figure 3 This is a partial cross-sectional view of the embodiment of the present application for showing the inner layer distribution of the guide structure Figure 1 ; Figure 4 yes Figure 3 A front cross-sectional view for showing the inner layer distribution of the guide structure; Figure 5 This is a partial cross-sectional view of the embodiment of the present application for showing the inner layer distribution of the guide structure Figure 2 ; Figure 6 yes Figure 5 A front cross-sectional view for showing the inner layer distribution of the guide structure; Figure 7 is a front cross-sectional view of an embodiment of the present application for showing that a corner portion of a reinforcement wire body is in contact with a spiral tube; Figure 8 This is a partial cross-sectional view of the embodiment of the present application for showing the inner layer distribution of the guide structure Figure 3 ; Fig. 9 yes Figure 8 Enlarged view of part A in .

[0018] In the figure: 100, outer tube body; 110, second embedded channel; 120, groove; 200, inner tube body; 210, guide channel; 220, first embedded channel; 300, spiral tube; 310, spiral segment; 400, reinforcement wire body; 410, limit sub-segment; 500, filling part. DETAILED DESCRIPTION

[0019] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0020] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0021] In the related art, the ureteral guide sheath is a medical device widely used in urological surgery, which is usually composed of an outer tube body, a spiral tube (also called a spring tube) in the middle layer, and an inner tube body. The design of the device aims to provide a certain support force so that the ureter can be smoothly introduced into the ureter. However, in practice, the inner layer often bulges, especially after long-term use, the problem of delamination and detachment between the inner tube body and the outer tube body becomes particularly significant. After in-depth research, the applicant found that the root cause of the bulging of the inner tube body is the delamination and detachment between the outer tube body and the inner tube body, and this problem is caused by multiple structural defects in the existing design.

[0022] First, the bonding surface between the inner and outer tubes of the ureteral guide sheath is not smooth and continuous, but due to the structural characteristics of the spiral tube in the middle layer, an uneven contact surface is formed. Specifically, the bonding surface between the metal and the glue of the spiral tube shows a periodic change pattern, which leads to obvious differences in the strength and area of ​​the bonding area. Due to this periodic change, the bonding force of the inner and outer tubes is uneven in different areas, especially when bent or stressed, it is easy to start to detach from the weak connection point. This detachment gradually expands from a small range, and eventually causes bulging of the inner tube. Therefore, the structural characteristics of the spiral tube and the periodic changes in the metal-glue bonding surface are the main factors leading to the delamination and detachment of the inner and outer tubes.

[0023] Secondly, the spiral tube, as the wire material of the middle layer, has the problem of displacement back and forth during use. This displacement causes the pitch of the spiral tube to change, which in turn makes the connection quality between the inner and outer tubes unbalanced. The change in pitch not only affects the stability of the connection between the inner and outer tubes, but also applies shear force to the connection surface during the change process. The shear force will aggravate the peeling between the inner and outer tubes, thereby further aggravating the occurrence of bulging of the inner tube. Even in the absence of obvious external force, the pitch change itself can cause a slight detachment between the inner and outer tubes, and gradually worsen with the extension of use time, ultimately affecting the overall performance of the ureteral guide sheath.

[0024] In the prior art, the problem of uneven connection and pitch variation caused by the spiral tube structure has not been effectively solved, resulting in the frequent bulging of the inner tube body and the separation of the inner and outer tube bodies during use of the ureteral guide sheath. This not only affects its reliability and stability in clinical surgery, but may also have an adverse effect on the patient's treatment process. Therefore, a new structural design is urgently needed to effectively avoid or slow down the separation of the inner and outer tube bodies and improve the smoothness of the ureteral guide sheath during instrument insertion.

[0025] Based on this, the present application provides a guiding structure, a ureteral sheath and a ureteral insertion device.

[0026] The following is combined with Figures 1 to 9 , a guide structure, a ureteral sheath and a ureteral insertion device provided by the present application are described in detail through specific embodiments and their application scenarios.

[0027] First, combining Figure 1 , Figure 2The present application provides a guide structure for use in a ureteral sheath, which includes an outer tube body 100, an inner tube body 200 and a spiral tube 300. The inner tube body 200 is arranged on the inner wall of the outer tube body 100, and a guide channel 210 is axially arranged in the inner tube body 200. The spiral tube 300 is spirally wound between the outer tube body 100 and the inner tube body 200 along the axial direction. Exemplarily, when the guide structure is initially manufactured, the spiral tube 300 is firstly sleeved on the inner tube body 200, and then the outer tube body 100 is formed on the periphery of the inner tube body 200 by an extrusion injection molding process, so that the spiral tube 300 can be covered between the inner tube body 200 and the outer tube body 100. Further, during surgery, the guide structure part is directly inserted into the patient's ureter, and the guide channel 210 can allow some surgical instruments to enter the ureter until the lesion.

[0028] At the same time, combined Figure 3 , Figure 4 The guide structure further includes a reinforcing wire 400, which shuttles in and out of the gaps of at least part of the spiral segments 310 along the axial direction of the outer tube 100, and at least part of the inner penetration section of the reinforcing wire 400 located inside the spiral tube 300 is fixedly penetrated in the inner tube 200. Exemplarily, the reinforcing wire 400 can shuttle in and out of the gaps of multiple spiral segments 310 in sequence, or can shuttle in and out of the gaps of the spiral segments 310 at intervals. Furthermore, when there is a reinforcement wire 400 in the guide structure, when the guide structure is initially manufactured, the reinforcement wire 400 is first passed in and out of the gaps between the multiple spiral segments 310, and then the inner tube body 200 is formed by injection molding inside the spiral tube 300 with the reinforcement wire 400 through the extrusion injection molding process, and then the outer tube body 100 is bonded to the outer surface of the spiral tube 300, so that the spiral tube 300 together with the reinforcement wire 400 can be covered between the inner tube body 200 and the outer tube body 100, and at the same time, under the extrusion injection molding manufacturing process, in the injection-molded inner tube body 200, part of the inner tube body 200 can surround the reinforcement wire 400, so that the reinforcement wire 400 forms an anchor point with it.

[0029] Exemplarily, when the reinforcement wire 400 is shuttled in and out of the gap of the spiral segment 310 of the spiral tube 300, the reinforcement wire 400 can be bent into a corrugated shape in advance according to a preset shape, and then one end of the reinforcement wire 400 is fixed, and the other end of the reinforcement wire 400 is first inserted into the gap at the end of the spiral segment 310, and then the spiral tube 300 is rotated around the central axis of the spiral tube 300. At this time, the reinforcement wire 400 can automatically and gradually penetrate into the entire section of the spiral tube 300.

[0030] Exemplarily, a first embedded channel 220 is provided in the tube wall of the inner tube body 200 for the reinforcing wire body 400 to pass through, so that the reinforcing wire body 400 can avoid the spiral segment 310 of the spiral tube 300, and an anchoring point is formed between the reinforcing wire body 400 and the first embedded channel 220. It is worth noting that the first embedded channel 220 is a circumferentially closed channel with two ends open, rather than a slot structure, that is, after the reinforcing wire body 400 passes through the first embedded channel 220, the segment portion of the reinforcing wire body 400 located in the first embedded channel 220 and the spiral segment 310 are in a state of avoiding each other.

[0031] On this basis, the pulling effect of the reinforcement wire 400 can effectively prevent the inner tube body 200 and the outer tube body 100 from being delaminated and separated. Even if the connection surface between the outer tube body 100 and the inner tube body 200 is separated due to the force during use, the reinforcement wire 400 in the design limits the relative movement of the inner and outer tube bodies through the fixed inner penetration section, avoiding the further expansion of the separation area along the axial direction. At the same time, due to the existence of the reinforcement wire 400, the connection force between the inner tube body 200 and the outer tube body 100 is enhanced, so that even under stress, the delamination between the inner tube body 200 and the outer tube body 100 is not easy to expand into a bulge, which significantly improves the stability and structural integrity of the ureteral sheath. In particular, when the joint surface between the outer tube body 100 and the inner tube body 200 is relatively weak or uneven, the reinforcement wire 400 plays a role of local reinforcement, ensuring the reliability of the guide structure during use. Furthermore, the role of the reinforcement wire 400 is not limited to preventing detachment. It can also effectively limit the change in the pitch of the spiral tube 300. Since the reinforcement wire 400 shuttles in and out of the gap between the spiral segments 310, it will limit the pitch between two adjacent spiral segments 310, reducing the impact of the shear force caused by the pitch change on the joint surface of the inner and outer tubes, thereby further optimizing the performance of the guide structure.

[0032] In summary, the reinforcement wire 400 plays a vital role in the guide structure of the present application, and can effectively solve the bulging problem caused by the delamination of the inner tube body 200 and the outer tube body 100, thereby ensuring the stability and long-term reliability of the ureteral sheath during use.

[0033] Exemplarily, the inner tube body 200 can be made of materials such as polyethylene, PTFE, etc., as the inner layer in contact with the medical fluid. The outer tube body 100 can be made of materials such as polyurethane, PEBAX, etc. Further, the thermal expansion coefficient of the material of the spiral tube 300 is less than the thermal expansion coefficient of the inner tube body 200 and less than the thermal expansion coefficient of the outer tube body 100.

[0034] Polyethylene and polytetrafluoroethylene are common biocompatible materials with excellent chemical resistance and corrosion resistance, and can effectively resist various chemical substances and drug components in medical fluids. This allows the inner tube body 200 to maintain stable physical and chemical properties for a long time when in contact with biological fluids such as urine, and is not prone to deformation or degradation, ensuring safety and hygiene during use by patients.

[0035] In addition, polyethylene and PTFE materials have a low friction coefficient, which can significantly reduce the resistance during instrument insertion, making the guide sheath smoother during insertion and reducing trauma and discomfort to the patient. Polyurethane and PEBAX, as materials for the outer tube 100, not only have high mechanical strength and toughness, and can effectively provide the necessary support, but also have excellent elasticity, can withstand certain bending and stretching without being easily damaged, and enhance the durability and reliability of the entire guide structure.

[0036] In general, the use of materials such as polyethylene, PTFE, polyurethane and PEBAX makes the inner tube body 200 and the outer tube body 100 have good biocompatibility, durability, flexibility and chemical resistance, which can greatly improve the performance of the ureteral sheath and ensure its safety, stability and effectiveness in clinical surgery.

[0037] In some embodiments, in combination Figure 4 , Figure 6 The outer tube body 100 or the inner tube body 200 has a filling portion 500 , and the filling portion 500 is embedded in the gap between adjacent spiral segments 310 of the spiral tube 300 . Exemplarily, the material of the filling portion 500 corresponds to the material of the outer tube body 100 or the inner tube body 200 .

[0038] Specifically, during the application of the spiral tube 300, due to the variability of the material and the stress of the structure, the pitch between adjacent spiral segments 310 often changes to a certain extent. Especially when subjected to external force or long-term use, the pitch of the spiral tube 300 is prone to deviation, thereby affecting the stability and reliability of the entire guide structure. The filling part 500 plays a role in fixing the pitch of the spiral tube 300 by being embedded in the gap between adjacent spiral segments 310, thereby effectively avoiding the change of the pitch.

[0039] Furthermore, the filling part 500 limits the relative displacement of the segments of the spiral tube 300 by physically embedding the gaps between the segments of the spiral tube 300, so that the pitch of the spiral tube 300 is kept within a relatively fixed range. This not only improves the stability of the spiral tube 300, but also avoids the adverse effects caused by the pitch change, especially the uneven force and unstable connection between the inner and outer tube bodies that may be caused by the pitch change of the spiral tube 300. Through the existence of the filling part 500, the pitch of the spiral tube 300 is not easy to change, thereby reducing the influence of the shear force generated by the pitch change on the joint surface of the inner and outer tube bodies, and further enhancing the connection force and stability of the inner and outer tube bodies.

[0040] In addition, the design of the filling part 500 can also reduce the sliding or friction between the spiral tube 300 and the inner and outer tube bodies, thereby effectively improving the mechanical strength of the entire guide structure and reducing the risk of failure due to material fatigue. Overall, the use of the filling part 500 effectively ensures the consistency of the pitch of the spiral tube 300, thereby improving the overall performance of the guide structure, making it more reliable and durable in actual use.

[0041] In some embodiments, Figure 2 , Figure 3 as well as Figure 4 As shown, when the filling portion 500 of the inner tube 200 is embedded in the gap between adjacent spiral segments 310 , at least a portion of the outer penetration section of the reinforcement wire 400 located outside the spiral tube 300 is fixedly penetrated in the outer tube 100 .

[0042] Exemplarily, a second embedded channel 110 is provided in the tube wall of the outer tube body 100 for the reinforcement wire body 400 to pass through, so that after the reinforcement wire body 400 passes through the first embedded channel 220, the filling part 500 and the second embedded channel 110 in sequence, it continues to avoid the spiral segment 310 of the spiral tube 300, and an anchoring point is also formed between the reinforcement wire body 400 and the second embedded channel 110.

[0043] On this basis, the design of the first embedded channel 220 and the second embedded channel 110 enables the reinforcement wire 400 to pass through the inner and outer tube bodies firmly and form an anchor point in the outer tube body 100, further strengthening the bonding force between the inner and outer tube bodies. This structure not only effectively limits the relative displacement between the inner and outer tube bodies, avoiding detachment and bulging caused by external force or long-term use, but also enhances the stability of the spiral tube 300 and reduces the shear force caused by pitch changes. Through the action of the reinforcement wire 400, even if there is a partial detachment at the joint surface of the inner and outer tube bodies, relying on the anchor point between the reinforcement wire 400 and the second embedded channel 110, it can effectively prevent the detachment area from further expanding, ensuring the reliability of the guide structure in long-term use.

[0044] In addition, the combination of the reinforcement wire 400 and the filling part 500 can provide additional support within the gap between the segments of the spiral tube 300, making the spiral tube 300 more stable during the force-bearing process and less prone to displacement or deformation. The design of the reinforcement wire 400 improves the compression and tensile resistance of the overall structure, enhances the mechanical strength of the guide structure, and further improves the overall performance and service life of the ureteral sheath. In summary, through the coordination of the first embedded channel 220, the filling part 500 and the second embedded channel 110, and the anchor point formed by the reinforcement wire 400, the guide structure significantly improves the connection stability between the inner and outer tube bodies, prevents detachment and bulging, and ensures the safety and stability of the medical device during use.

[0045] In some embodiments, Figure 5 as well as Figure 6 As shown, when the filling portion 500 of the outer tube body 100 is embedded in the gap between adjacent spiral segments 310, the inner tube wall surface of the outer tube body 100 is concave to form a groove 120 for accommodating the spiral segments 310 and the reinforcement wire body 400, and one side of the reinforcement wire body 400 is in contact with the inner wall of the groove 120, and the other side is in contact with the spiral segment 310.

[0046] On this basis, one side of the reinforcing wire body 400 is fitted with the inner wall of the groove 120, ensuring the positioning stability of the reinforcing wire body 400 in the outer tube body 100 and avoiding the displacement of the reinforcing wire body 400 due to external force. On the other hand, the other side of the reinforcing wire body 400 is fitted with the spiral segment 310, which enhances the synergy between the reinforcing wire body 400 and the spiral tube 300 and effectively limits the relative displacement between the segments of the spiral tube 300. Through this design, the reinforcing wire body 400 not only effectively improves the connection stability between the outer tube body 100 and the inner tube body 200, but also can prevent the pitch change of the spiral tube 300 or the detachment of the outer tube body 100 during long-term use. At the same time, the presence of the groove 120 reduces the friction between the reinforcing wire body 400 and the outer tube body 100, making the movement of the reinforcing wire body 400 smoother and less susceptible to extrusion or distortion, thereby extending the service life of the guide structure and improving the overall reliability of the ureteral sheath. In addition, the optimization of the guide structure can effectively avoid the instability factors caused by the friction between the spiral tube 300 and the reinforcement wire body 400, and further improve the overall performance of the guide structure.

[0047] It is worth noting that when the main structure of the filling part 500 is the outer tube body 100 , the second embedding channel 110 in the outer tube body 100 can be eliminated and replaced by the groove 120 on the surface of the outer tube body 100 .

[0048] In some embodiments, the filling portion 500 is bonded or thermally fused to the adjacent spiral segment 310 by a biocompatible adhesive. Exemplarily, the contact surface between the inner tube body 200 and the outer tube body 100 is also coated with a biocompatible adhesive, so that the connection strength of the bonding surface can be increased. Exemplarily, the biocompatible adhesive can be selected from polyurethane adhesives, polyvinyl alcohol (PVA) adhesives, acrylic adhesives, hyaluronic acid (HA)-based adhesives, etc., among which polyurethane (PU) adhesives are widely used in medical devices, have good biocompatibility, elasticity and water resistance, and are suitable for environments in direct contact with the human body; PVA is a water-soluble polymer with good biocompatibility, commonly used in surgical operations, and has a certain degree of degradability; acrylic acid and its derivatives, such as methacrylic acid (MMA), are often used in medical devices, they are usually harmless to the human body, and can effectively form strong adhesion; hyaluronic acid is a polysaccharide substance naturally present in human tissues, commonly used in surgical operations, etc., and hyaluronic acid-based adhesives have good biocompatibility and lubricity.

[0049] In some embodiments, Figure 7 As shown, the corner of the reinforcing wire body 400 is in contact with the spiral tube 300. Furthermore, the corner of the reinforcing wire body 400 is in contact with the surface of the spiral segment 310, which can limit the movement of the spiral tube 300 to a certain extent, ensuring that the pitch of two adjacent spiral segments 310 is not easily changed, and thus when the guide structure is inserted into the ureter, it is not easy for the inner tube body 200 to bulge in the case of bending.

[0050] In some embodiments, in combination Figure 8 , Fig. 9 , both ends of the reinforcing wire body 400 are provided with limiting sub-segments 410. After the reinforcing wire body 400 passes through the gap in and out of at least part of the spiral segment 310, the limiting sub-segment 410 overlaps with the spiral segment 310 at the outermost end of the spiral tube 300 to limit the radial position of the spiral segment 310.

[0051] Exemplarily, the limiting sub-segment 410 is vertically bent from below the outermost spiral segment 310 on the spiral tube 300 to the side of the corresponding spiral segment 310 , and then bent in the opposite direction and overlapped with the upper end of the corresponding spiral segment 310 .

[0052] Exemplarily, the limiting sub-segment 410 is vertically bent from above the outermost spiral segment 310 on the spiral tube 300 to the side of the corresponding spiral segment 310 , and then bent in the opposite direction and overlapped with the lower end of the corresponding spiral segment 310 .

[0053] On this basis, the presence of the limiter segment 410 can effectively prevent the spiral segment 310 from being displaced or loosened during use. The reinforcement wire 400 limits the free radial movement of the spiral segment 310 by overlapping the spiral segment 310, and avoids the segment of the spiral tube 300 from being offset due to external forces, especially under the bending and pressure of the guide structure during operation, thereby improving the mechanical stability of the entire guide structure. This design can effectively reduce the gap changes between the spiral segments 310, thereby effectively improving the connection quality of the inner and outer tube bodies, and avoiding the problems of interlayer detachment and bulging caused by the instability of the spiral segment 310 in the traditional design.

[0054] At the same time, by bending vertically to the side and then bending in the opposite direction below or above the spiral segment 310, the limiting sub-segment 410 can not only enhance its gripping force on the spiral segment 310, but also achieve more effective mechanical locking in space, further improving the fixation of the spiral segment 310. This design effectively avoids radial offset or displacement of the spiral segment 310 due to external force or long-term use, thereby increasing the long-term stability and reliability of the guide structure.

[0055] In a second aspect, the present application provides a ureteral sheath comprising the guide structure of any of the above-mentioned embodiments.

[0056] In a third aspect, the present application further provides a ureteral insertion device, comprising the guiding structure of the first aspect or the ureteral sheath of the second aspect.

[0057] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0058] In addition, it should be noted that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in a reverse order according to the functions involved. For example, the described methods may be performed in an order different from that described, and various steps may be added, omitted, or combined. In addition, features described with reference to certain examples may be combined in other examples.

[0059] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A guiding structure of a ureteral sheath, characterized in that: The invention comprises an outer tube body (100), an inner tube body (200) and a spiral tube (300), wherein the inner tube body (200) is arranged on the inner wall of the outer tube body (100), a guide channel (210) is axially arranged in the inner tube body (200), and the spiral tube (300) is spirally wound between the outer tube body (100) and the inner tube body (200) along the axial direction; It also comprises a reinforcing wire body (400), which passes through the gaps of at least part of the spiral segments (310) in and out along the axial direction of the outer tube body (100), and at least part of the inner penetration section of the reinforcing wire body (400) located on the inner side of the spiral tube (300) is fixedly penetrated in the inner tube body (200).

2. The guiding structure according to claim 1, characterized in that: The outer tube body (100) or the inner tube body (200) has a filling portion (500), and the filling portion (500) is embedded in the gap between adjacent spiral segments (310) of the spiral tube (300).

3. The guiding structure according to claim 2, characterized in that: When the filling portion (500) of the inner tube body (200) is embedded in the gap between adjacent spiral segments (310), at least part of the outer penetration section of the reinforcement wire body (400) located outside the spiral tube (300) is fixedly penetrated in the outer tube body (100).

4. The guiding structure according to claim 2, characterized in that: When the filling portion (500) of the outer tube body (100) is embedded in the gap between adjacent spiral segments (310), the inner tube wall surface of the outer tube body (100) is concave to form a groove (120) for accommodating the spiral segment (310) and the reinforcement wire body (400), and one side of the reinforcement wire body (400) is in contact with the inner wall of the groove (120) and the other side is in contact with the spiral segment (310).

5. The guiding structure according to any one of claims 2 to 4, characterized in that: The filling portion (500) is connected to the adjacent spiral segment (310) by bonding with a biocompatible adhesive or by thermal fusion.

6. The guiding structure according to claim 1, characterized in that: The corner portion of the reinforcing wire body (400) is in contact with the spiral tube (300).

7. The guiding structure according to claim 1, characterized in that: Both ends of the reinforcing wire body (400) are provided with limiting sub-segments (410); after the reinforcing wire body (400) passes through the gap in and out of at least part of the spiral segments (310), the limiting sub-segment (410) overlaps with the spiral segment (310) at the outermost end of the spiral tube (300) to limit the radial position of the spiral segment (310).

8. The guiding structure according to claim 7, characterized in that: The limiting sub-segment (410) is vertically bent from below or above the outermost spiral segment (310) on the spiral tube (300) to the side of the corresponding spiral segment (310), and then bent in the opposite direction and overlapped with the upper end or lower end of the corresponding spiral segment (310).

9. A ureteral sheath, characterized in that: It comprises the guiding structure as described in any one of claims 1 to 8.

10. A ureteral insertion device, characterized in that: It comprises the guiding structure according to any one of claims 1 to 8 or the ureteral sheath according to claim 9.

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