Ureteral stent

Abstract

The utility model relates to the technical field of medical instruments, in particular to a ureteral stent. Comprising a first fixing tube, a connecting tube and a second fixing tube which are sequentially communicated, the connecting tube comprises a connecting section and at least one supporting section, the supporting section is used for supporting a local narrow area in a ureter, the connecting section is made of a flexible material, and the strength of the supporting section is larger than that of the connecting section; wherein through holes are formed in the pipe wall of the first fixing pipe, the pipe wall of the connecting pipe and the pipe wall of the second fixing pipe, and the width of the first fixing pipe and the width of the second fixing pipe are larger than the pipe diameter of the connecting pipe. According to the ureteral stent, the supporting strength of the ureteral stent can be guaranteed, and the use experience feeling of a patient can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a ureteral stent. Background Art

[0002] Ureteral stenosis refers to partial or complete obstruction of the ureter caused by various causes, resulting in varying degrees of upper urinary tract obstruction and hydronephrosis, which in turn damages renal function or leads to renal failure. Ureteral stent placement is an effective, safe and simple method to treat ureteral stenosis, which can quickly relieve symptoms and restore the patient's quality of life.

[0003] Common ureteral stents currently include silicone stents, polyurethane stents, and metal stents. These stents are placed to provide drainage support when localized ureteral stenosis or obstruction occurs. Silicone stents are soft and less likely to cause irritation after placement, but they offer limited support and protection against malignant ureteral strictures. Metal ureteral stents offer strong support but can easily cause a strong foreign body sensation and lead to rejection. Utility Model Content

[0004] The technical problem to be solved by the embodiments of the present invention is to provide a ureteral stent to solve the problem in the prior art that silicone stents are soft in texture and not easy to cause irritation after placement, but are poor in supporting properties and resistance to malignant ureteral stenosis; metal ureteral stents have strong supporting properties but are prone to a strong foreign body sensation and cause rejection reactions.

[0005] The utility model discloses a ureteral stent, comprising: a first fixed tube, a connecting tube, and a second fixed tube connected in sequence, the connecting tube comprising a connecting section and at least one supporting section, the supporting section being used to support a local narrow area in the ureter, the connecting section being made of a flexible material, and the strength of the supporting section being greater than that of the connecting section; wherein, through holes are provided on the tube walls of the first fixed tube, the connecting tube, and the second fixed tube, and the widths of the first fixed tube and the second fixed tube are greater than the diameter of the connecting tube.

[0006] Optionally, the support section includes an inner lining layer, a support layer and an elastic layer which are sequentially arranged from the inside to the outside; the inner lining tube is made of a hydrophobic material, the elastic layer is made of a polymer elastic material, and the strength of the support layer is greater than the strength of the elastic layer.

[0007] Optionally, a lubricating coating is provided on the outer side of the ureteral stent.

[0008] Optionally, the support layer has a spiral woven structure or a mesh woven structure.

[0009] Optionally, the lining layer, the supporting layer and the elastic layer are an integrated structure.

[0010] Optionally, when there are multiple support segments, the multiple support segments are arranged at intervals.

[0011] Optionally, the diameter of the supporting segment is larger than the diameter of the connecting segment.

[0012] Optionally, the first fixing tube and the second fixing tube are in a curled structure.

[0013] Optionally, the first fixing tube and the second fixing tube are located on both sides of the connecting section.

[0014] Optionally, the first fixing tube and the second fixing tube adopt a double-layer structure, the inner layer structure is made of a hydrophobic material, and the outer layer structure is made of a polymer elastic material.

[0015] Compared with the prior art, the ureteral stent provided by the present invention has the following advantages: during use, the ureteral stent comprises a first fixing tube disposed in the patient's renal pelvis, a second fixing tube disposed in the patient's bladder, and a connecting tube disposed in the ureter. The width of the first fixing tube and the second fixing tube is greater than the diameter of the connecting tube, thereby ensuring stable placement of the first fixing tube and the second fixing tube in the patient's body and preventing displacement of the ureteral stent during peristalsis in the patient's ureter. The connecting tube comprises a connecting section and at least one supporting section, wherein the supporting section is located in a ureteral stenosis region during use, supporting the ureteral stenosis region through the supporting section so that urine enters the ureteral stent through the through hole and flows into the bladder after passing through the ureteral stent. At the same time, the connecting section is made of a flexible material, which can alleviate adverse reactions caused by the ureteral stent being placed in the patient's body and reduce the patient's discomfort. The strength of the supporting section is greater than that of the connecting section, ensuring the support strength of the ureteral stent in the stenosis region, improving the ability to resist the stenosis region in the ureter, and ensuring the drainage function of the ureteral stent. Therefore, the ureteral stent of this embodiment can not only ensure the supporting strength of the ureteral stent, but also improve the patient's usage experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments, in which:

[0017] Figure 1 This is an overall schematic diagram of a ureteral stent provided by an embodiment of the present utility model;

[0018] Figure 2 is a cross-sectional view of a support section provided by an embodiment of the present utility model;

[0019] Figure 3 This is a schematic structural diagram of a connecting section and a supporting section provided in one embodiment of the present utility model;

[0020] Figure 4 This is a schematic cross-sectional view of the connecting section and the supporting section provided in one embodiment of the present invention;

[0021] Figure 5 This is a schematic structural diagram of a ureteral stent provided by an embodiment of the present utility model placed in a patient's body.

[0022] The reference numerals in the figures are:

[0023] 100. Ureteral stent; 101. Through hole; 10. First fixing tube; 20. Connecting tube; 210. Connecting section; 220. Supporting section; 221. Lining layer; 222. Supporting layer; 223. Elastic layer; 224. Lubricating coating; 30. Second fixing tube; 40. Renal pelvis; 50. Bladder; 60. Uretera; 61. Stenosis area. DETAILED DESCRIPTION

[0024] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. Now, in conjunction with the accompanying drawings, a detailed description of the preferred embodiments of the present utility model will be given.

[0025] The present invention provides a ureteral stent 100, such as Figures 1 to 5 As shown, it includes a first fixed tube 10, a connecting tube 20 and a second fixed tube 30 connected in sequence. The connecting tube 20 includes a connecting section 210 and at least one supporting section 220. The supporting section 220 is used to support the local narrow area 61 in the ureter 60. The connecting section 210 is made of a flexible material, and the strength of the supporting section 220 is greater than that of the connecting section 210. Among them, the first fixed tube 10, the connecting tube 20 and the second fixed tube 30 are all provided with a through hole 101 on the tube wall, and the width of the first fixed tube 10 and the second fixed tube 30 is greater than the tube diameter of the connecting tube 20.

[0026] During use of the ureteral stent 100, the first fixing tube 10 is arranged in the patient's renal pelvis 40, the second fixing tube 30 is arranged in the patient's bladder 50, and the connecting tube 20 is arranged in the ureter 60. The width of the first fixing tube 10 and the second fixing tube 30 is set to be larger than the diameter of the connecting tube 20, so as to achieve the stable arrangement of the first fixing tube 10 and the second fixing tube 30 in the patient's body and prevent the ureteral stent 100 from shifting when the patient's ureter 60 moves. The connecting tube 20 includes a connecting section 210 and at least one supporting section 220. The supporting section 220 is located at the narrow region 61 of the ureter 60 during use. The supporting section 220 supports the narrow region 61 within the ureter 60, allowing urine to enter the ureteral stent 100 through the through hole 101. The urine, transported by the ureteral stent 100, flows into the bladder 50 after passing through the narrow region 61. Furthermore, the connecting section 210 is made of a flexible material, which can alleviate adverse reactions caused by the ureteral stent 100 being placed in the patient's body and reduce the patient's discomfort. The supporting section 220 is stronger than the connecting section 210, ensuring the supporting strength of the ureteral stent 100 within the narrow region 61, improving the ability to resist the narrow region 61 within the ureter 60, and ensuring the drainage function of the ureteral stent 100. Therefore, the ureteral stent 100 of this embodiment can not only ensure the supporting strength of the ureteral stent 100, but also improve the user experience of the patient.

[0027] The above-mentioned connecting section 210, the first fixed tube 10 and the second fixed tube 30 are made of flexible materials, for example, silicone. Silicone has excellent hydrophobic properties. While reducing the patient's discomfort, the contact angle formed by urine on the surface of the material is large, and the water droplets have strong rolling properties on the surface and are not easy to adhere to the surface, thereby reducing the adhesion of urine crystals to the tube wall, promoting the excretion of crystals, preventing the ureteral stent 100 from being blocked, and extending the service life of the ureteral stent 100.

[0028] As a preferred solution of this embodiment, refer to Figure 2 and Figure 3 The support section 220 includes an inner lining layer 221, a support layer 222 and an elastic layer 223 which are sequentially arranged from the inside to the outside; the inner lining tube is made of a hydrophobic material, and the elastic layer 223 is made of a polymer elastic material. The strength of the support layer 222 is greater than that of the elastic layer 223.

[0029] Here, an example of the composition of the support segment 220 is provided. The support segment 220 includes an inner lining layer 221, a support layer 222, and an elastic layer 223, which are sequentially arranged from the inside out. The inner lining is made of a hydrophobic material, which can reduce the contact angle of urine on the tube wall, facilitate urine flow, and reduce the adhesion of urine crystals on the tube wall, promote crystal excretion, prevent blockage of the ureteral stent 100, and extend the service life of the ureteral stent 100. The elastic layer 223 is made of a polymer elastic material and has a certain degree of flexibility. When it is attached to the inner wall of the ureter 60, it has good biocompatibility, can reduce irritation reactions, and alleviate patient discomfort. The strength of the support layer 222 is greater than that of the elastic layer 223, and is used to resist the radial pressure fed back from the narrow area 61 in the ureter 60, so that the ureter 60 remains unobstructed, ensuring good conductivity of the ureteral stent 100, and facilitating the flow of urine into the bladder 50. The material of the support layer 222 is not specifically limited here, and it only needs to meet the requirement that the strength is greater than that of the elastic layer 223. For example, the support layer 222 can be made of metal, wherein the metal has a high hardness and good supporting strength.

[0030] The polymer elastic material in this embodiment is not specifically limited. For example, the polymer elastic material may be polyurethane elastomer (TPU), polyolefin elastomer (TPO) or polyamide elastomer (TPEA).

[0031] As a preferred solution of this embodiment, refer to Figure 2 A lubricating coating 224 is also provided on the outer side of the elastic layer 223 .

[0032] Among them, the setting of the lubricating coating 224 can reduce the resistance during the placement of the ureteral stent 100 into the patient's ureter 60, reduce damage to the ureter 60 tissue, and facilitate the smooth operation of the surgical process. The lubricating coating 224 can be gelatin, polyvinyl alcohol gel, etc., which has good compatibility with human tissue and will not cause allergic reactions or the risk of infection.

[0033] As a preferred solution of this embodiment, the support layer 222 has a spiral woven structure or a mesh woven structure.

[0034] The spiral braided structure evenly distributes stress across the individual lines, thereby reducing the stress on individual lines and improving the overall structure's load-bearing capacity, resulting in excellent support strength. Mesh braided structures generally have excellent support strength. In actual applications, selecting an appropriate mesh structure (parallel braiding, cross braiding, or circular braiding) based on specific needs and environments can provide a stronger support capability. This can better counteract the radial pressure feedback from the narrow area 61 within the ureter 60, keeping the ureter 60 unobstructed and ensuring good conductivity of the ureteral stent 100, facilitating the flow of urine into the bladder 50.

[0035] As a preferred solution of this embodiment, the lining layer 221, the supporting layer 222 and the elastic layer 223 are an integrated structure.

[0036] Among them, the above-mentioned lining layer 221, support layer 222 and elastic layer 223 are an integrated structure to enhance the overall connection strength of the support section 220. In this embodiment, the lining layer 221, support layer 222 and elastic layer 223 are combined together by hot melt connection to form an integrated structure.

[0037] In this embodiment, hot melt connection is adopted, which has the advantages of high connection strength, forming a sealing layer at the connection part, simple and fast operation, and suitability for production.

[0038] As a preferred solution of this embodiment, when there are multiple supporting segments 220, the multiple supporting segments 220 are arranged at intervals.

[0039] Among them, the number of support segments 220 provided in this embodiment corresponds to the environmental conditions within the patient's ureter 60. When there are multiple stenosis areas 61 in the ureter 60, the number of corresponding support segments 220 is the same as the number of stenosis areas 61, so as to support the corresponding stenosis areas 61 and alleviate the stenosis problem of the ureter 60 in a targeted manner. Therefore, the number of support segments 220 is not specifically limited. The length of the support segment 220 can be adjusted within the range of 10mm-300mm, and increases with the increase in the length of the stenosis area 61 in correspondence with the length of the stenosis area 61. Therefore, the length of the support segment 220 is not specifically limited.

[0040] Therefore, the ureteral stent 100 of this embodiment has good adaptability, plays a role in conducting urine according to the actual environment in the ureter 60 of different patients, and can ensure the patient's usage experience to the greatest extent.

[0041] Reference Figure 5 , giving an example of a ureter 60 having a narrow area 61 therein.

[0042] As a preferred solution of this embodiment, the diameter of the supporting section 220 is larger than the diameter of the connecting section 210 .

[0043] Among them, when a malignant tumor appears on the inner wall of the patient's ureter 60, the diameter of the support segment 220 is larger than the diameter of the connecting segment 210, which can better support the compression of the tumor and still ensure the conductivity of the ureteral stent 100 so that urine can flow to the bladder 50. The diameter of the support segment 220 can be adjusted according to the tumor condition to achieve the purpose of supporting the tumor, and no specific limitation is made here.

[0044] As a preferred solution of this embodiment, refer to Figure 1 and Figure 5 , the first fixed tube 10 and the second fixed tube are in a curled structure.

[0045] The curled structure of the first and second fixing tubes 10 and 11 provides enhanced support and, when installed within the patient's body, creates a relatively gentle contact with the patient, reducing discomfort. During the actual production of the ureteral stent 100, the first and second fixing portions and the connecting segment 210 are integrally molded, enhancing the overall connection stability of the ureteral stent 100.

[0046] As a preferred solution of this embodiment, refer to Figure 1 and Figure 5 The first fixed tube and the second fixed tube are separated on both sides of the connecting section 210.

[0047] The first fixing tube and the second fixing tube are located on both sides of the connecting section 210 , and the ureteral stent 100 is evenly stressed when fixed in the patient's body, thereby ensuring the stability of the ureteral stent 100 in the patient's body.

[0048] As a preferred solution of this embodiment, the first fixing tube 10 and the second fixing tube 30 adopt a double-layer structure, the inner layer structure is made of a hydrophobic material, and the outer layer structure is made of a polymer elastic material.

[0049] Among them, the inner layers of the above-mentioned first fixed tube 10 and the second fixed tube 30 are made of hydrophobic material, which can reduce the contact angle of urine on the tube wall and facilitate the flow of urine. At the same time, it reduces the adhesion of urine crystals on the tube wall, promotes the excretion of crystals, prevents the ureteral stent 100 from being blocked, and extends the service life of the ureteral stent 100; the outer layer structure is made of polymer elastic material, which itself has a certain degree of softness. When it fits with the inner wall of the ureter 60, it has good biocompatibility, can reduce the irritation reaction, and reduce the patient's discomfort.

[0050] The polymer elastic material in this embodiment is not specifically limited. For example, the polymer elastic material may be polyurethane elastomer (TPU), polyolefin elastomer (TPO) or polyamide elastomer (TPEA).

[0051] It should be understood that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Those skilled in the art may modify the technical solutions described in the above embodiments, or make equivalent replacements for some of the technical features therein; and all these modifications and replacements should fall within the scope of protection of the claims attached to the present invention.

Claims

1. A ureteral stent, characterized in that: include: A first fixed tube, a connecting tube, and a second fixed tube are sequentially connected, wherein the connecting tube includes a connecting section and at least one supporting section, wherein the supporting section is used to support a local stenosis area in the ureter, and the connecting section is made of a flexible material, and the strength of the supporting section is greater than that of the connecting section; Wherein, through holes are provided on the tube walls of the first fixing tube, the connecting tube and the second fixing tube, and the width of the first fixing tube and the second fixing tube is greater than the diameter of the connecting tube.

2. The ureteral stent according to claim 1, characterized in that: The support section includes an inner lining layer, a support layer and an elastic layer which are sequentially sleeved from the inside to the outside; the inner lining layer is made of a hydrophobic material, the elastic layer is made of a polymer elastic material, and the strength of the support layer is greater than that of the elastic layer.

3. The ureteral stent according to claim 2, characterized in that: A lubricating coating is provided on the outer side of the ureteral stent.

4. The ureteral stent according to claim 2, characterized in that: The support layer is in a spiral woven structure or a mesh woven structure.

5. The ureteral stent according to claim 2, characterized in that: The lining layer, the supporting layer and the elastic layer are an integrated structure.

6. The ureteral stent according to claim 1, characterized in that: When there are multiple support segments, the multiple support segments are arranged at intervals.

7. The ureteral stent according to claim 1, characterized in that: The diameter of the supporting section is larger than the diameter of the connecting section.

8. The ureteral stent according to claim 1, characterized in that: The first fixing tube and the second fixing tube are in a curled structure.

9. The ureteral stent according to claim 8, characterized in that: The first fixing tube and the second fixing tube are located on both sides of the connecting section.

10. The ureteral stent according to claim 1, characterized in that: The first fixing tube and the second fixing tube adopt a double-layer structure, the inner layer structure is made of hydrophobic material, and the outer layer structure is made of polymer elastic material.

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