Anti-reflux ureteral stent

Abstract

The present application provides an anti-reflux ureteral stent, relating to the field of medical device technology. The anti-reflux ureteral stent comprises a main tube, a first component, and a second component, the first component and the second component being placed at both ends of the main tube; a flow blocking device for preventing urine reflux is provided in the main tube; the flow blocking device comprises a receiving tube and an elastic bladder; the outer diameter of the receiving tube is smaller than the inner diameter of the main tube; a capillary wick is provided in the receiving tube, and the capillary wick is used to drain part of the urine that refluxes from the second component into the main tube into the elastic bladder through capillary action, thereby causing the elastic bladder to deform; the elastic bladder is used to isolate the main tube when its maximum radial dimension reaches a preset dimension. The anti-reflux ureteral stent utilizes the capillary phenomenon to achieve the effect of actively preventing urine reflux.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and in particular to an anti-reflux ureteral stent. Background Art

[0002] Ureteral stents are medical devices commonly used in urological surgeries and treatments to maintain ureteral patency, promote urine drainage, or assist with postoperative recovery. For some patients, the placement of a ureteral stent can cause complications such as urinary reflux. Causes of urinary reflux include increased bladder pressure, which causes urine in the bladder to flow back into the kidneys through the lumen of the stent. Urinary reflux can cause symptoms such as low back pain and secondary urinary tract infections.

[0003] Some existing ureteral stents have a one-way valve at the end (the bladder side of the stent) to prevent reverse flow of urine. However, the presence of the one-way valve increases the bulk of the stent end and can exacerbate bladder irritation symptoms. Preventing urine backflow without a one-way valve at the end of the stent is a pressing issue. Summary of the Invention

[0004] The purpose of this application is to overcome the defects of the prior art and provide an anti-reflux ureteral stent to solve the problems in the prior art.

[0005] To solve the above problems, an embodiment of the present application provides an anti-reflux ureteral stent, comprising a main tube, a first component and a second component, wherein the first component and the second component are placed at both ends of the main tube; wherein the first component is used to be placed in the renal pelvis, and the second component is used to be placed in the bladder;

[0006] A flow blocking device for preventing urine from flowing back is provided in the main pipe;

[0007] The flow blocking device includes a receiving tube and an elastic bag, wherein the first end of the receiving tube faces the side where the second component is located, and the second end is connected to the elastic bag;

[0008] The outer diameter of the accommodating tube is smaller than the inner diameter of the main tube; a capillary wick is provided in the accommodating tube, and the capillary wick is used to drain part of the urine that flows back from the second component into the main tube into the elastic bladder through capillary action, thereby causing the elastic bladder to deform;

[0009] The elastic bag is used to isolate the main pipe when its maximum radial dimension reaches a preset dimension.

[0010] In one possible embodiment, the elastic sac includes a sac body and a sealing ring; the sealing ring is fixed to the outer wall of the sac body and is arranged along the circumference of the sac body; wherein the sealing ring is used to seal and contact the inner wall of the main pipe when the maximum radial dimension of the elastic sac reaches a preset dimension.

[0011] In a possible embodiment, the elastic bag is provided with a flow hole;

[0012] The elastic bag includes an annular connecting portion, which is sealed and connected to the containing tube; wherein the flow hole is located between the connecting portion and the sealing ring.

[0013] In a possible embodiment, the outer wall of the accommodating tube is provided with a plurality of connecting arms, and two adjacent connecting arms are arranged at intervals; wherein the connecting arms are fixedly connected to the inner wall of the main tube.

[0014] In a possible implementation, one end of the capillary wick is located in the elastic bag; the other end is located in the accommodating tube and is spaced apart from the second end of the accommodating tube.

[0015] In a possible implementation manner, compared with the first component, the second component is closer to the flow blocking device.

[0016] In a possible implementation, the length of the accommodating tube is 20-50 mm; and the capillary wick includes capillary fibers.

[0017] In a possible implementation manner, the outer wall of the main pipe is provided with a plurality of protrusion structures, and two adjacent protrusion structures are arranged at intervals.

[0018] In a possible implementation manner, the protruding structure is an arc-shaped structure.

[0019] In a possible implementation manner, both the first component and the second component include a curled structure.

[0020] The beneficial effects of this application include:

[0021] The anti-reflux ureteral stent proposed in this application comprises a main tube, a first component, and a second component. A flow-blocking device is provided within the main tube to prevent urine reflux. The flow-blocking device comprises a receiving tube and an elastic bladder. The first end of the receiving tube faces the side where the second component is located, and the second end is connected to the elastic bladder.

[0022] When urine reflux occurs, urine will flow from the bladder into the second component. Due to the internal pressure of the bladder, the urine in the bladder will continue to flow through the second component to the first component via the main pipe.

[0023] Since a flow blocking device is provided in the main pipe, when the refluxed urine passes through the location of the flow blocking device, the urine will contact the capillary core in the receiving tube. At this time, due to capillary action, part of the refluxed urine will be drained into the elastic bag.

[0024] As more urine enters the elastic bladder, it deforms. When its maximum radial dimension reaches a predetermined size, the outer wall of the bladder abuts the inner wall of the main tube, effectively blocking the main tube. This prevents urine from flowing back into the first component and the renal pelvis.

[0025] The anti-reflux ureteral stent utilizes the capillary phenomenon to actively prevent urine reflux and has the advantages of rapid response and high reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 A schematic diagram of an anti-reflux ureteral stent is shown;

[0028] Figure 2 Shown Figure 1 A partial enlarged view in the middle A direction;

[0029] Figure 3 Shown Figure 2 Schematic diagram of the elastic capsule after deformation;

[0030] Figure 4 shows Figure 2 Schematic diagram of the aa direction;

[0031] Figure 5 A schematic cross-sectional view of a main pipe is shown.

[0032] Description of main component symbols:

[0033] 100 - main pipe; 110 - raised structure; 200 - first component; 300 - second component; 410 - accommodating tube; 411 - capillary wick; 412 - connecting arm; 420 - elastic capsule; 421 - capsule body; 422 - sealing ring; 423 - flow hole; 430 - connecting part. DETAILED DESCRIPTION

[0034] The following describes in detail embodiments of the present application. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application.

[0035] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0036] In this application, for the main tube of an anti-reflux ureteral stent, the direction of urine flow from the first component through the main tube to the second component is defined as the forward flow direction, and the direction of urine flow from the second component through the main tube to the first component is defined as the reverse flow direction. The function of the flow blocking device in the main tube is to prevent urine from flowing in the reverse flow direction, thereby preventing urine from flowing back from the bladder into the renal pelvis through the main tube. When urine flows in the forward flow direction, it indicates that the urine in the anti-reflux ureteral stent is in a normal flow state.

[0037] In this application, the first end and the second end of a component refer to both ends of the component.

[0038] The anti-reflux ureteral stent proposed in this application achieves the effect of preventing urine reflux without providing a one-way valve, and has the advantages of small size, rapid response and high reliability.

[0039] Example

[0040] See Figures 1-4 In this embodiment, an anti-reflux ureteral stent is proposed, which has the function of preventing urine reflux. Figure 2 In the elastic bag 420 is in a natural state; Figure 3 In the figure, the elastic bag 420 is in a deformed state. In addition, in the figure, the arrow n represents the inner wall of the main pipe 100, and the arrow w represents the outer wall of the main pipe 100.

[0041] The anti-reflux ureteral stent includes a main tube 100, a first component 200 and a second component 300, which are respectively placed at both ends of the main tube 100. The first component 200 is used to be placed in the renal pelvis, and the second component 300 is used to be placed in the bladder.

[0042] like Figure 2 and Figure 3 As shown, a flow blocking device for preventing urine from flowing back is provided in the main pipe 100. Compared with the first component 200, the second component 300 is closer to the flow blocking device. Figure 1 The flow blocking device is set at the position corresponding to the mark A in the figure.

[0043] The flow blocking device includes a receiving tube 410 and an elastic bag 420 . Compared with the receiving tube 410 , the elastic bag 420 is closer to the first component 200 .

[0044] The first end of the accommodating tube 410 faces the side where the second component 300 is located, and the second end is connected to the elastic bag 420. Figure 2-Figure 3 The first end of the accommodating tube 410 is located at the top, and the second end is located at the bottom, wherein the first end of the accommodating tube 410 is closer to the first component 200.

[0045] The outer diameter of the containment tube 410 is smaller than the inner diameter of the main tube 100, ensuring that the containment tube 410 does not block the main tube 100 and affect the normal flow of urine. The inner diameter of the main tube 100 is 1±0.1 mm. The elastic modulus of the containment tube 410 is greater than that of the bladder body 421 of the elastic bladder 420. Compared to the elastic bladder 420, the containment tube 410 is less susceptible to deformation, thereby providing better support for the elastic bladder 420.

[0046] The accommodating tube 410 is provided with a capillary core 411, which is used to drain part of the urine that flows back from the second component 300 into the main tube 100 into the elastic bag 420 through capillary action, so that the elastic bag 420 is deformed. Figure 2 and Figure 3 In the figure, the gap between the capillary core 411 and the containing tube 410 is only for the convenience of distinguishing the capillary core 411 from the containing tube 410. In actual products, there may be no gap between the capillary core 411 and the inner wall of the containing tube 410.

[0047] The elastic bag 420 is used to isolate the main pipe 100 when its maximum radial dimension reaches a preset dimension. The radial directions of the elastic bag 420 and the main pipe 100 are consistent, wherein the preset dimension is the dimension of the inner diameter of the main pipe 100.

[0048] The elastic bladder 420 can be spherical. Since the inner diameter of the main tube 100 is only 1 mm, the outer diameter of the elastic bladder 420 in its natural state (hollow and unaffected by external forces) is necessarily less than 1 mm. Consequently, the volume of the elastic bladder 420 is very small. Therefore, when a very small amount of urine is drained into the elastic bladder 420 by the capillary wick 411, the elastic bladder 420 fills with urine and deforms. When the maximum radial dimension of the elastic bladder 420 is smaller than a predetermined dimension, a gap exists between the outer wall of the elastic bladder 420 and the inner wall of the main body, allowing urine to flow.

[0049] The anti-reflux ureteral stent works as follows:

[0050] When urine reflux occurs, urine will flow from the bladder into the second component 300. Due to the internal pressure of the bladder, the urine in the bladder will continue to flow through the second component 300 and the main pipe 100 to the first component 200.

[0051] Since the main pipe 100 is provided with a flow blocking device, when the urine flows back through the location of the flow blocking device, the urine will come into contact with the capillary wick 411 in the receiving tube 410. At this time, due to the capillary action, part of the urine flowing back will be quickly drained into the elastic bag 420.

[0052] As more urine enters the elastic bladder 420, the volume of the elastic bladder 420 changes. When the maximum radial dimension of the elastic bladder 420 reaches a predetermined size, the outer wall of the elastic bladder 420 abuts against the inner wall of the main tube 100, thereby isolating the main tube 100. This prevents urine from flowing back into the first component 200 and the renal pelvis.

[0053] The anti-reflux ureteral stent utilizes the capillary phenomenon to actively prevent urine reflux and has the advantages of rapid response and high reliability.

[0054] In this embodiment, the elastic bladder 420 includes a bladder body 421 and a sealing ring 422. The sealing ring 422 is fixed to the outer wall of the bladder body 421 and is arranged along the circumference of the bladder body 421. The sealing ring 422 is configured to seal against the inner wall of the main tube 100 when the maximum radial dimension of the elastic bladder 420 reaches a predetermined dimension. The sealing ring 422 can improve the sealing effect.

[0055] The elastic modulus of the sealing ring 422 is greater than the elastic modulus of the capsule 421 .

[0056] like Figure 2 and Figure 3 As shown, a flow hole 423 is defined on the body 421 of the elastic bag 420 .

[0057] Furthermore, the elastic bag 420 includes an annular connecting portion 430, which is sealed to the housing tube 410, wherein the flow hole 423 is located between the connecting portion 430 and the sealing ring 422. The connecting portion 430 and the housing tube 410 can be connected by laser welding or hot melting.

[0058] During urine backflow, urine enters the containment tube 410 and comes into contact with the capillary wick 411. At this point, under capillary action, the urine is drained into the elastic bladder 420. Due to the presence of the flow hole 423, some of the urine that has entered the elastic bladder 420 will be discharged outside the elastic bladder 420 through the flow hole 423. As the urine in the bladder continues to backflow, when the urine submerges the flow hole 423, due to the internal pressure of the bladder, the pressure outside the elastic bladder 420 is greater than the pressure on the inner wall of the elastic bladder 420. As a result, urine inside the main tube 100 and outside the elastic bladder 420 enters the elastic bladder 420 through the flow hole 423. At the same time, the capillary wick 411 continues to drain the urine into the elastic bladder 420. In this way, within a certain period of time, the elastic bladder 420 will rapidly deform, and its maximum radial dimension will reach the preset size, thereby isolating the main tube 100.

[0059] When the intra-bladder pressure returns to normal, the urine that has refluxed into the main tube 100 will flow back into the bladder from the second component 300 due to gravity and other factors. At the same time, some of the urine in the elastic bladder 420 will be discharged from the elastic bladder 420 through the flow hole 423 and enter the main tube 100. In this way, the radial dimension of the elastic bladder 420 will be reduced, so that the blocked main tube 100 can be restored to a connected state.

[0060] Since the first component 200 is farther away from the blocking device than the second component 300 , even if part of the refluxed urine flows onto the elastic bag 420 , the blocking device can ensure that the main pipe 100 is blocked before the urine flows to the first component 200 .

[0061] like Figure 4 As shown, the outer wall of the receiving tube 410 is provided with a plurality of connecting arms 412, with adjacent connecting arms 412 spaced apart. The connecting arms 412 are fixedly connected to the inner wall of the main tube 100. The connecting arms 412 and the main tube 100 can be connected by laser welding or heat fusion. The connection between the connecting arms 412 and the main tube 100 secures the flow blocking device within the main tube 100.

[0062] The main pipe 100 and the first component 200 can be integrally formed; the main pipe 100 and the second component 300 can be fixedly connected by laser welding or heat fusion. After the accommodating tube 410 and the elastic bladder 420 are connected, the flow blocking device is formed. The flow blocking device is placed into the end of the main pipe 100 away from the first component 200. Subsequently, the connecting arm 412 is connected to the main pipe 100; then, the second component 300 is connected to the main pipe 100.

[0063] like Figure 2 and Figure 3 As shown, one end of the capillary core 411 is located in the elastic bag 420 ; the other end is located in the accommodating tube 410 and is spaced apart from the second end of the accommodating tube 410 .

[0064] When urine flows in the normal flow direction through main tube 100, capillary wick 411 is shielded from the urine by elastic bladder 420 and containment tube 410. Consequently, urine is not directed into elastic bladder 420 by capillary wick 411. This ensures that, during normal urine flow (i.e., normal flow), elastic bladder 420 does not obstruct urine from draining from the renal pelvis into the bladder. A gap is created between capillary wick 411 and the second end of containment tube 410 to prevent normal urine flow from splashing onto capillary wick 411.

[0065] In this embodiment, the length of the receiving tube 410 is 20-50 mm, and the capillary wick 411 includes capillary fibers. The capillary wick 411 is made of capillary fibers, wherein the capillary fibers include plant fibers or polymer fibers.

[0066] The capillary wick 411 is a flexible structure. During installation, the capillary wick 411 can be pulled into the housing tube 410 via a filament. For example, during assembly, one end of the capillary wick 411 is connected to the filament, which passes through the housing tube 410 and out of the flow hole 423. A force is applied to the filament to pull the capillary wick 411 into the housing tube 410. Subsequently, the connection between the filament and the capillary wick 411 is disconnected.

[0067] The capillary core 411 and the receiving tube 410 can be relatively fixed by friction. In addition, the capillary core 411 and the receiving tube 410 can also be relatively fixed by laser welding or heat melting at a local position.

[0068] like Figure 5 As shown, the outer wall of the main tube 100 is provided with a plurality of protrusion structures 110, and two adjacent protrusion structures 110 are arranged at intervals. The protrusion structures 110 are arc-shaped structures. The protrusion structures 110 have the function of supporting the ureter.

[0069] In this embodiment, the first component 200 and the second component 300 both include elastic curling structures. When no external force is applied, the first component 200 and the second component 300 both take on a curled shape.

[0070] After the installation of the anti-reflux ureteral stent is completed, the first component 200 is located in the renal pelvis and the second component 300 is located in the bladder. When the guide wire is removed: the first component 200 will curl up spontaneously, thereby allowing the first component 200 to remain in the renal pelvis; the second component 300 will curl up spontaneously, thereby allowing the second component 300 to remain in the bladder.

[0071] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0072] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. An anti-reflux ureteral stent, characterized in that: The invention comprises a main pipe, a first component and a second component, wherein the first component and the second component are placed at two ends of the main pipe; wherein the first component is used to be arranged in the renal pelvis, and the second component is used to be arranged in the bladder; A flow blocking device for preventing urine from flowing back is provided in the main pipe; The flow blocking device includes a receiving tube and an elastic bag, wherein the first end of the receiving tube faces the side where the second component is located, and the second end is connected to the elastic bag; The outer diameter of the accommodating tube is smaller than the inner diameter of the main tube; a capillary wick is provided in the accommodating tube, and the capillary wick is used to drain part of the urine that flows back from the second component into the main tube into the elastic bladder through capillary action, thereby causing the elastic bladder to deform; The elastic bag is used to isolate the main pipe when its maximum radial dimension reaches a preset dimension; The elastic sac includes a sac body and a sealing ring; the sealing ring is fixed to the outer wall of the sac body and arranged along the circumference of the sac body; wherein the sealing ring is used to seal and contact the inner wall of the main pipe when the maximum radial dimension of the elastic sac reaches a preset dimension; One end of the capillary core is located in the elastic bag; the other end is located in the accommodating tube and is spaced apart from the second end of the accommodating tube; The elastic bag is provided with a flow hole; The elastic bag includes an annular connecting portion, which is sealed and connected to the containing tube; wherein the flow hole is located between the connecting portion and the sealing ring.

2. The anti-reflux ureteral stent according to claim 1, characterized in that: The outer wall of the accommodating tube is provided with a plurality of connecting arms, and two adjacent connecting arms are arranged at intervals; wherein, the connecting arms are fixedly connected to the inner wall of the main tube.

3. The anti-reflux ureteral stent according to claim 1, characterized in that: Compared with the first component, the second component is closer to the flow blocking device.

4. The anti-reflux ureteral stent according to claim 1, characterized in that: The length of the accommodating tube is 20-50 mm; the capillary wick includes capillary fibers.

5. The anti-reflux ureteral stent according to claim 1, characterized in that: The outer wall of the main pipe is provided with a plurality of protruding structures, and two adjacent protruding structures are arranged at intervals.

6. The anti-reflux ureteral stent according to claim 5, characterized in that: The convex structure is an arc-shaped structure.

7. The anti-reflux ureteral stent according to claim 1, characterized in that: The first component and the second component both include a curled structure.

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