Ureteral stent

Abstract

The utility model provides a kind of ureteral stent, including pipe body, the pipe body includes straight pipe part, the both ends of the straight pipe part are respectively set curved portion, multiple first drainage holes are set on the pipe wall of the straight pipe part, at least one the curved portion is set multiple second drainage holes, the distal end of at least one the curved portion is set head portion in the shape of taper, the pipe wall of the straight pipe part and the curved portion is all used multiple layer structure, and its pipe wall includes inner layer, reinforcing layer and outer layer in turn from inside to outside. The integrated structure formed by the reinforcing layer of spring layer and / or braided layer and inner and outer layers can improve the support force and biocompatibility of ureteral stent, and by setting drainage hole on the straight pipe part and curved portion, it can avoid sticking with renal pelvis / bladder, ensure smooth drainage, solve the problem of insufficient support, poor drainage effect and easy displacement of traditional stent.

Description

Technical Field

[0001] This utility model relates to the technical field of delivery devices, specifically to a ureteral stent. Background Technology

[0002] Ureteral stents are an important tool in modern urology, and ureteral stent placement is one of the most common urological procedures, with indications including almost any surgery involving the ureter and various kidney surgeries. After placement, a ureteral stent allows urine from the kidney to drain into the bladder via both intraluminal and extraluminal pathways, relieving hydronephrosis caused by ureteral obstruction and related pain and infection. Additionally, ureteral stents can support the ureter and prevent / treat ureteral strictures.

[0003] However, traditional ureteral stents are mostly made of a single polymer material or a single metal material. The former lacks sufficient support, while the latter is too rigid and prone to irritating tissues. Metal materials are also prone to aging and corrosion. Stents made of a single material are also susceptible to twisting or collapse, especially in ureteral stenosis, which can lead to stent displacement or drainage failure. Some stents use spring coils or braided mesh structures, but these lack multi-layered composite material technology, resulting in limited compression resistance. Furthermore, the drainage holes on existing ureteral stents are poorly designed; for example, drainage holes located on the lateral wall tend to adhere to the renal pelvis / bladder wall, leading to decreased drainage efficiency. Utility Model Content

[0004] The purpose of this utility model embodiment is to provide a ureteral stent to solve the above-mentioned problems existing in the prior art.

[0005] To solve the above-mentioned technical problems, this utility model provides a ureteral stent, including a tube body. The tube body includes a straight tube section, and curved sections are respectively provided at both ends of the straight tube section. Multiple first drainage holes are provided on the tube wall of the straight tube section, and multiple second drainage holes are provided on at least one of the curved sections. A conical head is provided at the distal end of at least one of the curved sections. The tube walls of both the straight tube section and the curved sections adopt a multi-layer structure, and their tube walls include an inner layer, a reinforcing layer and an outer layer from the inside to the outside.

[0006] In some embodiments, the curved portion is configured as a J-shaped structure.

[0007] In some embodiments, the plurality of first drainage holes are spaced apart by a predetermined interval, and the orientation of the plurality of first drainage holes is rotated by a predetermined angle sequentially along the extension direction of the straight tube portion.

[0008] In some embodiments, the inner layer and the outer layer are made of a polymer material.

[0009] In some embodiments, the reinforcing layer within the straight tube portion includes a spring layer and a braided layer, the spring layer extending axially along the straight tube portion, and the braided layer disposed on the outer or inner side of the spring layer.

[0010] In some embodiments, the spring layer is disposed close to the inner layer, and the braided layer is disposed close to the outer layer.

[0011] In some embodiments, the reinforcing layer within the bend includes at least a braided layer, the straight section and the braided layer within the bend are integrally formed, and the braided layer can extend from the straight section into the head of the bend.

[0012] In some embodiments, the spring layer is formed by spring wires arranged spirally along the axial direction of the straight tube portion.

[0013] In some embodiments, the braided layer is a single-metal wire winding structure or a multi-metal wire mesh structure.

[0014] In some embodiments, the spring layer and / or the braided layer are coated with a polymer material.

[0015] This utility model embodiment improves the support and biocompatibility of the ureteral stent through the reinforcing layer formed by the spring layer and / or braided layer and the integrated structure formed by the inner and outer layers. By setting drainage holes on the straight and curved parts, it can avoid contact with the renal pelvis / bladder, ensure smooth drainage, and solve the problems of insufficient support, poor drainage effect and easy displacement of traditional stents. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the ureteral stent according to an embodiment of the present invention;

[0018] Figure 2 This is a cross-sectional schematic diagram of the straight tube portion of the ureteral stent according to an embodiment of the present invention;

[0019] Figure 3 This is a cross-sectional schematic diagram of the curved portion of the ureteral stent according to an embodiment of the present invention.

[0020] Figure label:

[0021] 1-Bend; 11-Second drainage hole; 12-Head; 2-Straight tube; 21-First drainage hole; 3-Outer side; 4-Braided layer; 5-Spring layer; 6-Inner layer. Detailed Implementation

[0022] Various embodiments and features of this utility model are described herein with reference to the accompanying drawings.

[0023] It should be understood that various modifications can be made to the embodiments described herein. Therefore, the above description should not be considered as limiting, but merely as an example of embodiments. Other modifications within the scope and spirit of this invention will be apparent to those skilled in the art.

[0024] The accompanying drawings, which are included in and form part of this specification, illustrate embodiments of the present invention and, together with the general description of the present invention given above and the detailed description of the embodiments given below, serve to explain the principles of the present invention.

[0025] These and other features of the present invention will become apparent from the following description of preferred forms of embodiments given as non-limiting examples, with reference to the accompanying drawings.

[0026] It should also be understood that although the present invention has been described with reference to some specific examples, those skilled in the art can certainly implement many other equivalent forms of the present invention, which have the features described in the claims and are therefore all within the scope of protection defined herein.

[0027] The above and other aspects, features and advantages of the present invention will become more apparent when taken in conjunction with the accompanying drawings and in view of the following detailed description.

[0028] Specific embodiments of the present invention will now be described with reference to the accompanying drawings; however, it should be understood that the claimed embodiments are merely examples of the present invention, which may be implemented in various ways. Well-known and / or repeated functions and structures have not been described in detail to avoid unnecessary or redundant details that could obscure the present invention. Therefore, the specific structural and functional details claimed herein are not intended to be limiting, but merely to serve as the basis and representative basis for the claims to teach those skilled in the art to use the present invention in a variety of substantially any suitable detailed structures.

[0029] This specification may use the phrases “in one embodiment,” “in another embodiment,” “in yet another embodiment,” or “in other embodiments,” all of which may refer to one or more of the same or different embodiments according to the present invention.

[0030] This utility model embodiment provides a ureteral stent, which can be introduced into the human body via a guidewire. The ureteral stent includes a tube body, such as... Figures 1-3 As shown, the pipe body includes a straight pipe section 2, and two curved sections 1 are respectively provided at both ends of the straight pipe section 2. The curved sections 1 can be configured as a J-shaped structure. Here, the two curved sections 1 located at both ends of the straight pipe section 2 can be bent in different directions.

[0031] Furthermore, a plurality of first drainage holes 21 are provided on the wall of the straight pipe section 2, and the plurality of first drainage holes 21 are spaced apart by a predetermined interval. Preferably, the orientations of the different first drainage holes 21 are set according to a predetermined rule, and the orientations of the different first drainage holes 21 can be different. In a specific embodiment, a plurality of first drainage holes 21 are provided on the straight pipe section 2 at a certain distance, the distance of which is set according to the length of the straight pipe section 2, for example, 10 mm. The orientations of the plurality of first drainage holes 21 are sequentially rotated by a predetermined angle along the extension direction of the straight pipe section 2. The predetermined angle can be, for example, 30°, 60°, 90°, etc. By sequentially rotating and staggering the plurality of first drainage holes 21, drainage in different directions can be achieved, thereby improving the drainage effect.

[0032] Furthermore, at least one of the curved portions 1 is provided with a plurality of second drainage holes 11. By providing the second drainage holes 11 on the curved portion 1, it is possible to effectively prevent the ureteral stent from being tightly attached to the renal pelvis or the inner wall of the bladder, ensuring that the drainage holes are always unobstructed, and further improving the drainage efficiency.

[0033] In this embodiment, the diameter of the first drainage hole 21 and / or the second drainage hole 11 is preferably 0.5-1.5 mm. In this embodiment, the drainage holes provided on the straight tube 2 and the curved part 1 can effectively drain urine, improve the drainage effect, reduce urine retention, and reduce the risk of infection.

[0034] Furthermore, at least one of the curved portions 1 is provided with a head 12 at its distal end, the outer wall of the head 12 being tapered, the tapered head 12 facilitating the pushing of the ureteral stent within the cavity when the ureteral stent is introduced into the human body.

[0035] Furthermore, the straight tube portion 2 and the curved portion 1 of the ureteral stent both adopt a multi-layer structure. The tube wall includes an inner layer 6, a reinforcing layer and an outer layer 3 from the inside to the outside. In order to enable the inner lumen of the ureteral stent to slide smoothly along the guide wire, the thickness of the inner layer 6 and the outer layer 3 in this embodiment is preferably set to 0.05-0.2 mm.

[0036] In this embodiment, the inner layer 6 and the outer layer 3 are preferably made of materials with good biocompatibility and lubricity, such as polytetrafluoroethylene (PTFE). Other polymer materials can also be used, such as thermoplastic polyurethane (TPU), polyamide (PA), and polyether block polyamide (Pebax). In one specific embodiment, the inner layer 6 and the outer layer 3 can form a thin PTFE film, thereby forming an integrated structure with the reinforcing layer. This integrated structure improves the overall integrity and stability of the ureteral stent.

[0037] The reinforcing layer within the straight tube section 2 includes a spring layer 5 and a braided layer 4. The spring layer 5 extends axially along the straight tube section 2, and the braided layer 4 is disposed on the outer or inner side of the spring layer 5. In this embodiment, the spring layer 5 is disposed near the inner layer 6, and the braided layer 4 is disposed near the outer layer 3. This prioritizes the rigidity of the straight tube section 2. Alternatively, the spring layer 5 can be disposed near the outer layer 3, and the braided layer 4 can be disposed near the inner layer 6.

[0038] The spring layer 5 here is formed by spring wires made of metal, such as stainless steel or nickel-titanium alloy. The spring wires are spirally arranged along the axial direction of the straight tube 2, which can provide additional axial support for the lumen of the ureteral stent and prevent the lumen from collapsing due to external pressure (such as ureteral stenosis, stones or tumor compression). Even if the wall of the outer layer 3 is deformed by pressure, the spring layer 5 located on the inner side can still maintain the patency of the lumen, ensure that the urine drainage path is not blocked, and reduce the risk of stent displacement.

[0039] The braided layer 4 is made of stainless steel or nickel-titanium alloy, and it is either a single-metal wire winding structure or a multi-metal wire mesh structure. Compared to the spring layer 5, which provides axial elasticity, the braided layer 4 provides radial support. By combining the braided layer 4 with the spring layer 5 to form a composite reinforcing structure, the ureteral stent is less prone to collapse under external pressure. In this embodiment, when the braided layer 4 is located on the outside of the spring layer 5, it can also prevent torsional stress concentration from causing the spring layer 5 to unravel.

[0040] Furthermore, the spring layer 5 and the braided layer 4 are coated with a polymer material that completely encapsulates them. This prevents direct contact between the metal material and the tissue, reducing tissue irritation and inflammatory responses, and improving biocompatibility.

[0041] The reinforcing layer formed by the spring layer 5 and the braided layer 4 can increase the cross-sectional area of ​​the lumen by reducing the wall thickness, significantly reducing the resistance to urine flow, improving drainage efficiency, preventing the lumen from collapsing due to external pressure (such as ureteral stenosis, stones or tumor compression), and also giving the ureteral stent good flexibility and fatigue resistance, adapting to the physiological activities of the ureter, and extending the service life of the ureteral stent.

[0042] The reinforcing layer within the curved portion 1 includes at least the braided layer 4, wherein the straight tube portion 2 and the braided layer 4 within the curved portion 1 are integrally formed, and the braided layer 4 extends from the straight tube portion 2 into the head 12 of the curved portion 1. Because the tip of the head 12 has a certain degree of flexibility to conform to the direction of the urethra, bladder, and ureter, reducing resistance during insertion, the flexible head 12 may be difficult to pass through in areas of ureteral stenosis due to insufficient resistance. The presence of the braided layer 4 reduces the flexibility of the head 12, and by increasing the rigidity of the head 12, stronger axial support can be provided, facilitating penetration of dense tissue or mildly calcified areas, and assisting the ureteral stent in crossing the obstruction segment. Furthermore, extending the braided layer 4 into the head 12 can also improve the abrupt transition in rigidity from the straight tube portion 2 to the head 12. In other embodiments, the spring layer 5 within the straight tube portion 2 can also be extended into the head 12, thereby increasing the axial support.

[0043] This utility model embodiment improves the support and biocompatibility of the ureteral stent through the reinforcing layer formed by the spring layer and / or braided layer and the integrated structure formed by the inner and outer layers. By setting drainage holes on the straight and curved parts, it can avoid contact with the renal pelvis / bladder, ensure smooth drainage, and solve the problems of insufficient support, poor drainage effect and easy displacement of traditional stents.

[0044] Furthermore, the features of the embodiments shown in the accompanying drawings or the various embodiments mentioned in this specification should not be construed as independent embodiments. Rather, each feature described in one example of an embodiment can be combined with one or more other desired features from other embodiments to produce other embodiments not described in words or with reference to the drawings.

[0045] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A ureteral stent, characterized in that, The device includes a pipe body, which includes a straight pipe section. Both ends of the straight pipe section are respectively provided with curved sections. The pipe wall of the straight pipe section is provided with a plurality of first drainage holes. At least one of the curved sections is provided with a plurality of second drainage holes. The distal end of at least one of the curved sections is provided with a conical head. The pipe walls of both the straight pipe section and the curved section adopt a multi-layer structure, and their pipe walls include an inner layer, a reinforcing layer and an outer layer from the inside to the outside.

2. The ureteral stent according to claim 1, characterized in that, The curved portion is configured as a J-shaped structure.

3. The ureteral stent according to claim 1, characterized in that, The plurality of first drainage holes are spaced apart by a predetermined interval, and the orientation of the plurality of first drainage holes is rotated by a predetermined angle sequentially along the extension direction of the straight tube.

4. The ureteral stent according to claim 1, characterized in that, The inner layer and the outer layer are made of polymer material.

5. The ureteral stent according to claim 1, characterized in that, The reinforcing layer within the straight tube section includes a spring layer and a braided layer. The spring layer extends axially along the straight tube section, and the braided layer is disposed on the outside or inside of the spring layer.

6. The ureteral stent according to claim 5, characterized in that, The spring layer is disposed close to the inner layer, and the braided layer is disposed close to the outer layer.

7. The ureteral stent according to claim 5, characterized in that, The reinforcing layer within the curved portion includes at least a braided layer, and the braided layer within the straight tube portion and the curved portion is integrally formed, wherein the braided layer extends from the straight tube portion into the head of the curved portion.

8. The ureteral stent according to claim 7, characterized in that, The spring layer is formed by spring wires, which are spirally arranged along the axial direction of the straight tube.

9. The ureteral stent according to claim 7, characterized in that, The braided layer is a single-metal wire winding structure or a multi-metal wire mesh structure.

10. The ureteral stent according to claim 7, characterized in that, The spring layer and / or the braided layer are coated with a polymer material.

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