Ureteral stent

Abstract

The present application relates to the technical field of medical instruments and specifically discloses a ureteral stent. The ureteral stent comprises a catheter and a one-way valve. A first curled section is arranged at one end of the catheter, and a second curled section is arranged at the other end of the catheter. The one-way valve is formed by attaching two integrally-formed membranes to each other, and a portion of the second curled section extends between the two membranes by means of a liquid inlet end. Liquid outlet holes are formed in the side wall of the second curled section. The liquid outlet holes are located in the portion of the second curled section that extends between the two membranes, and the liquid outlet direction of at least one of the liquid outlet holes intersects with a first direction; the first direction is the direction in which the two membranes face each other. In the described solution, the two membranes are attached to each other, so that the one-way valve is in a closed state, which can effectively prevent urine from flowing back to the kidney and causing injury to the kidney. As the liquid outlet direction of a first liquid outlet hole in the second curled section intersects with the first direction, the membranes hardly shield the liquid outlet hole even if the one-way valve is in a closed state as a result of attaching the two membranes to each other. The urine in the renal pelvis can still flow through the catheter into the one-way valve by means of the unshielded liquid outlet hole, so that the urine in the bladder is prevented from flowing back to the kidney and smooth urine conveyance is enabled, thus ensuring the safety of the kidney.

Description

A ureteral stent Technical Field

[0001] This application relates to the field of medical device technology, and in particular to a ureteral stent. Background Technology

[0002] A ureteral stent is a hollow tube made of polymer material. It is widely used in urological surgery. Its main purpose is to ensure that urine flows smoothly from the kidney to the bladder, avoid ureteral stricture and urinary fistula, and help to expel stone fragments.

[0003] Ureteral stents are primarily placed after ureteral stones or ureteral surgery, and in other situations that may lead to ureteral obstruction, such as hydronephrosis, kidney transplantation, kidney and ureteral tumors, and ureteral stricture. Furthermore, it is necessary to place a ureteral stent before extracorporeal shock wave lithotripsy, obstetric and gynecological surgeries, and complex surgeries involving the retroperitoneal ureteral region. This stent plays a crucial role in draining urine and preventing intraoperative ureteral injury. However, in practice, the use of ureteral stents in these techniques can lead to impaired urine drainage, resulting in increased intrarenal pressure and potential kidney damage. Utility Model Content

[0004] This application discloses a ureteral stent to solve the technical problem of poor urine drainage in ureteral stents in related technologies.

[0005] To solve the above problems, this application adopts the following technical solution:

[0006] This application provides a ureteral stent, which includes a catheter and a one-way valve. One end of the catheter is provided with a first coiled section, and the other end of the catheter is provided with a second coiled section. The one-way valve is formed by two integrally molded diaphragms bonded together. A portion of the second coiled section extends between the two diaphragms through the inlet end.

[0007] The second coiled segment has a liquid outlet hole on its side wall. The liquid outlet hole is located in the part of the second coiled segment that extends between the two membranes, and the liquid outlet direction of at least one of the liquid outlet holes intersects with the first direction, which is the direction in which the two membranes are opposite to each other.

[0008] Furthermore, there are two liquid outlet holes, and the liquid outlet directions of the two liquid outlet holes are distributed in different radial directions of the conduit.

[0009] Furthermore, there are two liquid outlet holes. When the liquid outlet direction of one of the liquid outlet holes coincides with the first direction, the angle between the liquid outlet direction of the other liquid outlet hole and the first direction is 30°≤α≤150°.

[0010] Furthermore, the number of liquid outlet holes is three, and the three liquid outlet holes are distributed circumferentially along the conduit. When the liquid outlet direction of one of the liquid outlet holes coincides with the first direction, the other two liquid outlet holes are distributed on both sides of the first direction.

[0011] Furthermore, when there are at least two outlet holes, the at least two outlet holes are distributed along the axial direction of the conduit.

[0012] Furthermore, along the second direction, the one-way valve includes an expansion section and a release section, the width of the expansion section gradually increases until it connects with the release section, the second coiled section extends to the expansion section, and the second direction is the flow direction of urine within the one-way valve.

[0013] Furthermore, along the second direction, the extension length of the expansion segment is less than the extension length of the release segment.

[0014] Furthermore, a plurality of liquid inlet holes are provided on the sidewall of the first curled section, and the plurality of liquid inlet holes are distributed along the extension path of the first curled section.

[0015] Furthermore, the plurality of liquid inlet holes are formed on at least one side of the first coiled segment.

[0016] Furthermore, the conduit is provided with markings distributed along its extension direction.

[0017] The technical solution adopted in this application can achieve the following beneficial effects:

[0018] In this ureteral stent, when there is a large amount of urine in the bladder, the two diaphragms adhere to each other, keeping the one-way valve closed. This effectively prevents urine from flowing back to the kidneys and causing kidney damage. The discharge direction of the first outlet on the second coiled segment intersects with the first direction. Even when the two diaphragms adhere to each other and the one-way valve is closed, the diaphragms cannot easily block the outlet. Urine in the renal pelvis can still flow through the catheter and into the one-way valve through the unblocked outlet. This not only prevents urine from flowing back to the kidneys from the bladder but also ensures smooth urine delivery, further ensuring kidney safety. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application 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 of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 is a schematic diagram of the structure of the ureteral stent according to an embodiment of this application;

[0021] Figure 2 is a magnified view of part A in Figure 1;

[0022] Figure 3 is a magnified view of part B in Figure 2;

[0023] Figure 4 is a schematic diagram of the structure of the catheter according to an embodiment of this application;

[0024] Figure 5 is a magnified view of part C in Figure 4;

[0025] Figure 6 is a schematic diagram of the one-way valve according to an embodiment of this application;

[0026] Figure 7 is a schematic diagram of the second curled segment extending into the one-way valve according to an embodiment of this application;

[0027] Figure 8 is a schematic diagram of the distribution of the liquid outlet holes in an embodiment of this application.

[0028] In the picture:

[0029] 100, conduit; 110, first coiled section; 111, inlet port; 120, second coiled section; 121, outlet port; 200, one-way valve; 200a, diaphragm; 210, expansion section; 220, release section. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0031] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0032] The ureteral stent provided in this application will be described in detail below with reference to Figures 1 to 8, through specific embodiments and application scenarios.

[0033] Please refer to Figures 1 and 3. This application discloses a ureteral stent for use in urological surgery to smoothly drain urine from the kidney to the bladder. The disclosed ureteral stent includes a catheter 100 and a one-way valve 200. The catheter 100 is a hollow tube structure with both ends connected, that is, the catheter 100 has a fluid inlet port at one end and a fluid outlet port at the other end. The fluid inlet port of the catheter 100 is located at the renal pelvis, and the fluid outlet port of the catheter 100 is located at the bladder.

[0034] One end of the catheter 100 is provided with a first coiled section 110, which is located in the renal pelvis. The other end of the catheter 100 is provided with a second coiled section 120, which is located in the bladder. The coiled portions at both ends of the catheter 100 can increase the contact area between the ureteral stent and the renal pelvis and bladder, thereby enhancing the supporting effect of the ureteral stent. When the ureteral stent is correctly placed, the coiled portions at both ends of the catheter 100 can fit tightly against the mucosa of the renal pelvis and bladder, which can effectively prevent the ureteral stent from shifting or falling off.

[0035] Please refer to Figures 3, 6, and 7. The one-way valve 200 is formed by two integrally molded diaphragms 200a bonded together. One end of the one-way valve 200 is the inlet end, and the other end is the outlet end. Part of the second coiled section 120 extends between the two diaphragms 200a through the inlet end. When there is a large amount of urine in the bladder, the two diaphragms 200a will bond together under the pressure of the urine and be in a closed state, which can prevent the urine in the bladder from flowing back to the kidneys through the catheter 100 and causing kidney damage.

[0036] In this embodiment of the application, please refer to Figures 4 and 5. A liquid outlet hole 121 is provided on the side wall of the second coiled segment 120. The liquid outlet hole 121 is located in the part of the second coiled segment 120 that extends into the two membranes 200a, and the liquid outlet direction of at least one liquid outlet hole 121 intersects with the first direction, which is the direction in which the two membranes 200a are opposite to each other. For example, please refer to Figure 7. The first direction can be the direction from the upper membrane 200a to the lower membrane 200a in Figure 7. In this way, even when the two membranes 200a are attached to each other and the one-way valve 200 is in a closed state, the membranes 200a are unlikely to block the liquid outlet hole 121. Urine in the renal pelvis can still flow through the catheter 100 and through the unblocked liquid outlet hole 121 into the one-way valve 200. While avoiding the backflow of urine from the bladder to the kidney, it can ensure the smoothness of urine delivery and further ensure the safety of the kidney.

[0037] In one optional embodiment, as shown in Figure 7, there can be two outlet holes 121. The outlet directions of the two outlet holes 121 are distributed in different radial directions of the catheter 100. In this way, when assembling the catheter 100 and the one-way valve 200, there is a situation where the outlet directions of both outlet holes 121 intersect with the first direction. Neither of the two diaphragms 200a will block the two outlet holes 121. Even if one outlet hole 121 is blocked by either diaphragm 200a, the other outlet hole 121 will not be blocked. This makes the assembly of the catheter 100 and the one-way valve 200 more flexible and can significantly improve the assembly efficiency of the ureteral stent.

[0038] In a further technical solution, please refer to Figure 7. When the liquid outlet direction of one of the liquid outlets 121 coincides with the first direction, the angle between the liquid outlet direction of the other liquid outlet 121 and the first direction is 30°≤α≤150°. That is to say, the angle between the liquid outlet direction of the unshielded liquid outlet 121 and the first direction is 30°≤α≤150°. In this way, the diaphragm 200a is far away from the unshielded liquid outlet 121, making it difficult for the diaphragm 200a to block or obstruct the flow of the liquid outlet 121.

[0039] In an optional embodiment of this application, the number of outlet holes 121 can be three. The three outlet holes 121 are distributed circumferentially along the catheter 100. When the outlet direction of one outlet hole 121 coincides with the first direction, the other two outlet holes 121 are distributed on both sides of the first direction. Urine flows out from both sides of the first direction, which can increase the drainage efficiency of urine, prevent urine from stagnating in the catheter 100, and reduce the risk of infection and stone formation.

[0040] In a further technical solution, please refer to Figure 8. When there are at least two outlet holes 121, that is, when there are two or more outlet holes 121, the outlet holes 121 are distributed along the axial direction of the catheter 100. The outlet holes 121 distributed along the extension direction of the catheter 100 can effectively reduce the pressure of urine inside the catheter 100 and increase the drainage efficiency of urine. When urine flows out through outlet holes 121 in multiple directions, they disperse the impact force of urine, reduce the pressure of urine on the ureteral wall of the patient, and reduce damage or patient discomfort.

[0041] In this embodiment, please refer to Figure 6. Along the second direction, that is, the flow direction of urine within the one-way valve 200, the one-way valve 200 includes an expansion section 210 and a release section 220 connected to the expansion section 210. The width of the expansion section 210 gradually increases until it connects with the release section 220, while the width of the release section 220 can remain consistent. The second coiled section 120 extends to the expansion section 210. In this way, the expansion section 210 can serve as a accommodating space for the end portion of the second coiled section 120. When there is a large amount of urine in the bladder, based on the supporting effect of the portion of the catheter 100 extending into the expansion section 210, the expansion section 210 is difficult to be compressed and completely adhered together. The urine applies pressure to the release section 220, causing the portions of the two diaphragms 200a corresponding to the release section 220 to adhere together, thereby preventing backflow of urine.

[0042] In a further technical solution, along the flow direction of urine within the one-way valve 200, the extension length of the expansion section 210 is less than the extension length of the release section 220. In this way, under the action of urine pressure, the contact area between the two diaphragms 200a in the release section of the entire one-way valve 200 is larger. This enhances the tightness of the fit between the diaphragm 200a and the catheter 100, which can reduce the possibility of urine backflow from the bladder to the catheter 100. That is, the sealing effect against backflowing urine is better, which helps to prevent urine reflux.

[0043] In this embodiment of the application, please refer to Figure 2. A plurality of liquid inlet holes 111 are also provided on the side wall of the first coiled section 110. The plurality of liquid inlet holes 111 are distributed along the extension path of the first coiled section 110. The provision of the plurality of liquid inlet holes 111 can increase the amount of urine entering the catheter 100, reduce the accumulation and retention of urine in the renal pelvis, and can timely drain urine to the bladder.

[0044] In a further technical solution, please refer to Figure 2. Multiple inlet holes 111 are formed on at least one side of the first coiled segment 110. It should be noted that, in this embodiment, "at least one side of the first coiled segment 110" means that the first coiled segment 110 is coiled to form a disc-shaped structure, and the inlet holes 111 are formed on one or both sides of the disc-shaped structure. The inlet holes 111 are formed on one side of the disc-shaped structure, rather than on the radially inner and radially outer sides of the first coiled segment 110. This avoids the coiled structure of the first coiled segment 110 itself obstructing or restricting the flow of the inlet holes 111, thus ensuring the liquid flow rate of the inlet holes 111 as much as possible.

[0045] In a further technical solution, the catheter 100 is provided with markings distributed along its extension direction. These markings can be in various forms such as graphics, numbers, or scale lines. Through the markings, doctors can ensure that the catheter 100 is inserted into the correct position when inserting the ureteral stent, avoiding insertion that is too deep or too shallow, thereby reducing possible complications.

[0046] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0047] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application.

Claims

1. A ureteral stent, characterized in that, include: A conduit (100) has a first coiled section (110) at one end and a second coiled section (120) at the other end. A one-way valve (200) is formed by bonding two integrally molded diaphragms (200a) together, with a portion of the second curled section (120) extending between the two diaphragms (200a); The second coiled segment (120) has a liquid outlet hole (121) on its side wall. The liquid outlet hole (121) is located in the part of the second coiled segment (120) that extends between the two membranes (200a). The liquid outlet direction of at least one of the liquid outlet holes (121) intersects with a first direction, which is the direction in which the two membranes (200a) are opposite to each other.

2. The ureteral stent according to claim 1, characterized in that, The number of liquid outlet holes (121) is two, and the liquid outlet directions of the two liquid outlet holes (121) are distributed in different radial directions of the conduit (100).

3. The ureteral stent according to claim 2, characterized in that, When the discharge direction of one of the discharge holes (121) coincides with the first direction, the angle between the discharge direction of the other discharge hole (121) and the first direction is 30°≤α≤150°.

4. The ureteral stent according to claim 1, characterized in that, The number of liquid outlet holes (121) is three. The three liquid outlet holes (121) are distributed circumferentially along the conduit (100). When the liquid outlet direction of one of the liquid outlet holes (121) coincides with the first direction, the other two liquid outlet holes (121) are distributed on both sides of the first direction.

5. The ureteral stent according to claim 3 or 4, characterized in that, When there are at least two outlet holes (121), the at least two outlet holes (121) are distributed along the axial direction of the conduit (100).

6. The ureteral stent according to claim 1, characterized in that, Along the second direction, the one-way valve (200) includes an expansion section (210) and a release section (220), the width of the expansion section (210) gradually increases to connect with the release section (220), the second coiled section (120) extends to the expansion section (210), and the second direction is the flow direction of urine in the one-way valve (200).

7. The ureteral stent according to claim 6, characterized in that, Along the second direction, the extension length of the expansion segment (210) is less than the extension length of the release segment (220).

8. The ureteral stent according to claim 1, characterized in that, The first curled section (110) is also provided with a plurality of liquid inlet holes (111) on its sidewall, and the plurality of liquid inlet holes (111) are distributed along the extension path of the first curled section (110).

9. The ureteral stent according to claim 8, characterized in that, The liquid inlet (111) is located on at least one side of the first coiled segment (110).

10. The ureteral stent according to claim 1, characterized in that, The conduit (100) is provided with markings distributed along its extension direction.

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