Ureteral stent

Abstract

The utility model discloses a ureteral stent, including the hollow support body, the inside of support body is provided with at least one can realize the membrane component of one -way flow of medium. The utility model discloses the one -way flow membrane component of setting up in the hollow support body prevents urine reflux effectively, and the low density design of the both ends of memory alloy braided tube reduces the irritation to ureter, and the structure of the both ends diameter greater than the middle section enhances the fixity and reduces the risk of displacement.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically to a ureteral stent. Background Technology

[0002] With improved living standards, the incidence of ureteral stricture is rising. The resulting upper urinary tract obstruction and hydronephrosis can lead to serious complications such as lower back pain, infection, and even uremia. Traditional endovascular treatments, such as ureteral dilation and endoscopic incision, require long-term placement of double-J stents to maintain patency. However, these stents have drawbacks, including susceptibility to blockage, infection, displacement, stone formation, and frequent replacement, affecting treatment outcomes and patients' quality of life. While metal stents offer advantages such as long-term placement, large-diameter dilation, and low obstruction rates, long-term placement can lead to urine reflux. The mechanism of vesicoureteral reflux involves impaired ureteral orifice antireflux function. When intravesical pressure is abnormally high (e.g., in benign prostatic hyperplasia or neurogenic bladder), urine reflux causes hydronephrosis. If the pressure is not relieved in time, irreversible ureteral structural changes can occur, ultimately leading to renal failure.

[0003] Neither traditional stents nor metal stents have completely solved the problems of maintaining long-term patency and preventing urine reflux leading to hydronephrosis in the treatment of ureteral stricture. Utility Model Content

[0004] The purpose of this utility model is to provide a ureteral stent in order to solve the above problems.

[0005] To achieve the above objectives, this utility model specifically adopts the following technical solution:

[0006] A ureteral stent includes: a hollow stent body, wherein at least one membrane component capable of enabling unidirectional flow of media is disposed inside the stent body.

[0007] As a further description of the above technical solution, the support body includes a braided tube, and the surface of the braided tube is covered with a film.

[0008] As a further description of the above technical solution, the braided tube is made of shape memory alloy wire, and the braiding density at both ends of the braided tube is less than that in the middle section.

[0009] As a further description of the above technical solution, the diameters at both ends of the support body are larger than the diameter of the middle section.

[0010] As a further description of the above technical solution, a retrieval line is provided at one end of the stent body near the bladder.

[0011] As a further description of the above technical solution, the membrane module includes an inlet section and an outlet section, the diameter of the inlet section is larger than the diameter of the outlet section, and the inlet section and the outlet section are integrally formed.

[0012] As a further description of the above technical solution, the coating and the membrane assembly are any one of PTFE, ePTFE, PVC, PC, polyurethane or silicone.

[0013] As a further description of the above technical solution, the membrane is provided with at least one coating layer inside and / or outside, the coating layer being an anti-crystallization coating, an antibacterial coating, a hydrophilic coating, or a hydrophobic coating.

[0014] As a further description of the above technical solution, the membrane assembly is fixed inside the support body by welding, bonding, or mechanical fixation. The beneficial effects of this utility model are as follows:

[0015] This invention effectively prevents urine reflux by using an anti-reflux membrane inside the hollow support body. Combined with the low-density design at both ends of the shape memory alloy braided tube, it reduces irritation to the ureter. The structure with a diameter at both ends that is larger than that in the middle section enhances fixation and reduces the risk of displacement.

[0016] To more clearly illustrate the structural features and functions of this utility model, the following detailed description of this utility model is provided in conjunction with the accompanying drawings and specific embodiments. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the ureteral stent and anti-reflux membrane provided by this utility model in the closed state;

[0018] Figure 2 This is a schematic diagram of the ureteral stent and anti-reflux membrane provided by this utility model in the open state;

[0019] Figure 3 This is a schematic diagram of the anti-backflow membrane provided by this utility model in the open state;

[0020] Figure 4 This is a schematic diagram of the anti-backflow membrane provided by this utility model in the closed state.

[0021] Reference numerals: 100, support body; 110, recycling line; 200, membrane module; 201, inlet section; 202, outlet section; 300, membrane coating. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0023] like Figures 1-4 As shown, in one embodiment, a ureteral stent includes a hollow stent body 100. The stent body 100 contains at least one membrane assembly 200 that enables unidirectional flow of the medium. When the stent body 100 is placed in the target location, i.e., the ureter, it provides effective support for the ureter. The membrane assembly 200 within the stent body 100 is an anti-reflux membrane, which essentially acts as a one-way valve, allowing unobstructed flow in the forward direction and preventing reflux in the reverse direction, effectively preventing urine reflux and reducing surgical complications. In some embodiments, only one anti-reflux membrane is provided. In other feasible embodiments, multiple anti-reflux membranes can be provided, such as two, three, or four.

[0024] Optionally, the stent body 100 includes a braided tube with a membrane 300 on its surface. The anti-reflux membrane is placed at any position inside the stent and can be fixed to the stent by means of welding, bonding, mechanical fixation, etc. It can be fixed to the membrane 300 or directly to the stent to ensure that the anti-reflux membrane is not displaced or even detached when urine passes through the stent body 100.

[0025] Optionally, the braided tube is made of shape memory alloy wire, and the braiding density at both ends of the braided tube is less than that in the middle section, which can reduce the support force at both ends, thereby reducing irritation to the ureter and complications such as reactive hyperplasia.

[0026] Optionally, the diameters at both ends of the stent body 100 are larger than the diameter of the middle section. The larger diameter sections at both ends allow the stent body 100 to be securely fixed inside the ureter, preventing stent displacement. For example, the diameters at both ends are 5-15 mm, and the diameter of the middle section is 2-10 mm.

[0027] Optionally, a retrieval line 110 is provided at one end of the stent body 100 near the bladder. The stent body 100 can be easily retrieved by pulling the retrieval line 110. In some embodiments, the retrieval line 110 can be a monofilament, multifilament or other linear structure, such as a suture. The material can be a polymer material such as PTFE, PE, PA, PP, or a metal material such as stainless steel, copper, nickel-titanium alloy, etc.

[0028] Optionally, the membrane module 200 includes an inlet section 201 and an outlet section 202. The diameter of the inlet section 201 is larger than the diameter of the outlet section 202, and the inlet section 201 and the outlet section 202 are integrally formed. The inlet section 201 and the outlet section 202 have a variable diameter section at their midpoint, and the outlet section 202 closes when subjected to reverse impact from liquid, thereby effectively preventing urine reflux.

[0029] Optionally, the materials of the support surface coating 300 and the anti-backflow membrane can be PTFE, ePTFE, PVC, PC, polyurethane, silicone, etc. The coating 300 can be formed by processes such as impregnation, spraying, and bonding. At the same time, a coating layer is applied to the inner and outer surfaces of the membrane. The coating can be applied to both the inner and outer layers, or it can be a single layer, such as the outer layer. The coating can be an anti-crystallization coating, an antibacterial coating, a hydrophilic / hydrophobic coating, or other coatings, such as a pyrene coating or an isobutyltriethoxysilane coating.

[0030] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A ureteral stent, characterized in that, include: A hollow support body, wherein at least one membrane component capable of enabling unidirectional flow of the medium is disposed inside the support body, the support body includes a braided tube, the surface of the braided tube is coated with a membrane, the braided tube is woven from shape memory alloy wires, and the braiding density at both ends of the braided tube is less than that in the middle section, and the diameter at both ends of the support body is greater than that in the middle section.

2. The ureteral stent according to claim 1, characterized in that, A retrieval line is provided at one end of the stent body near the bladder.

3. The ureteral stent according to claim 1, characterized in that, The membrane module includes an inlet section and an outlet section, the diameter of the inlet section is larger than the diameter of the outlet section, and the inlet section and the outlet section are integrally formed.

4. The ureteral stent according to claim 1, characterized in that, The coating and the membrane assembly are any one of PTFE, ePTFE, PVC, PC, polyurethane, or silicone.

5. The ureteral stent according to claim 2, characterized in that, The membrane has at least one coating layer on its interior and / or exterior, which is an anti-crystallization coating, an antibacterial coating, a hydrophilic coating, or a hydrophobic coating.

6. The ureteral stent according to claim 1, characterized in that, The membrane assembly is fixed inside the support body by welding, bonding or mechanical fixation.

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