Disposable anti-reflux biliary stent

Abstract

The utility model discloses a disposable anti-backflow biliary tract support which comprises a support body, a valve seat, a valve clack and an elastic component. The valve seat is arranged in the stent body and connected to the inner wall of the stent body, a bile duct side channel located on one side of the valve seat and an intestinal tract side channel located on the other side of the valve seat are arranged in the stent body, and a circulation channel used for communicating the bile duct side channel with the intestinal tract side channel is arranged in the valve seat. The valve clack is arranged in the intestinal tract side channel and connected to the valve seat in a sliding mode in the axial direction of the valve seat, one end of the elastic component is connected with the stent body, and the other end of the elastic component is connected with the valve clack. The valve clack is used for being driven by the elastic component to slide to be attached to the valve seat so as to seal the circulation channel, and the valve clack is further used for sliding to be separated from the valve seat so as to open the circulation channel. According to the utility model, intestinal contents can be prevented from flowing back into the bile duct.

Description

Technical Field

[0001] The utility model relates to a disposable anti-reflux bile duct stent. Background Art

[0002] At present, implanting a biliary stent into a narrow or obstructed area is a good method for treating biliary obstruction. Biliary stents have been widely used in the medical field. A biliary stent is disclosed in the Chinese patent publication number CN217118687U. However, after implanting a biliary stent, intestinal contents will flow back into the bile duct through the biliary stent, thereby causing reflux cholangitis and affecting the patient's health. Some existing biliary stents have a relatively single function and cannot prevent intestinal contents from flowing back into the bile duct. Utility Model Content

[0003] The technical problem to be solved by the utility model is to overcome the defects of the prior art and provide a disposable anti-reflux biliary stent, which can prevent intestinal contents from refluxing into the bile duct.

[0004] In order to solve the above technical problems, the technical solution of the utility model is: a disposable anti-reflux biliary stent, which includes a stent body, a valve seat, a valve flap and an elastic component;

[0005] The valve seat is arranged in the support body and connected to the inner wall of the support body;

[0006] The stent body has a bile duct side channel located on one side of the valve seat and an intestinal side channel located on the other side of the valve seat;

[0007] The valve seat is provided with a flow channel for connecting the bile duct side channel and the intestinal side channel;

[0008] The valve flap is arranged in the intestinal side channel and is slidably connected to the valve seat along the axial direction of the valve seat;

[0009] One end of the elastic component is connected to the bracket body, and the other end of the elastic component is connected to the valve flap. The valve flap is used to slide relative to the valve seat until it fits on the valve seat under the drive of the elastic component to close the circulation channel. The valve flap is also used to slide to separate from the valve seat to open the circulation channel when subjected to pressure in the bile duct side channel.

[0010] Furthermore, the elastic component is located in the intestinal side channel.

[0011] A specific structure of the elastic component is further provided. The elastic component is a conical spring. An end portion of the conical spring with a larger diameter is connected to the bracket body, and an end portion of the conical spring with a smaller diameter is connected to the valve flap.

[0012] Furthermore, the valve flap is slidably connected to the valve seat via a sliding rod portion; wherein the sliding rod portion is connected to the valve flap, and a sliding matching hole corresponding to the sliding rod portion one by one is provided on the valve seat, and the sliding rod portion is slidably connected in the sliding matching hole.

[0013] Furthermore, one end of the sliding rod portion is connected to the valve flap, and the other end of the sliding rod portion is provided with an anti-slip step portion.

[0014] Furthermore, at least two sliding rod parts are sequentially arranged along the circumferential direction.

[0015] Furthermore, one end of the valve seat facing the bile duct side channel is provided with a guide cone portion for guiding the bile in the bile duct side channel to flow into the circulation channel.

[0016] Furthermore, an end portion of the valve seat facing the intestinal side channel is provided with a fitting conical surface portion for fitting with the valve flap, and the valve flap is a conical structure adapted to the fitting conical surface portion.

[0017] Furthermore, a concave cavity is provided at one end of the valve flap facing away from the valve seat.

[0018] A specific structure of the stent body is further provided. The stent body comprises a skeleton and a coating covering the skeleton. The skeleton is formed by winding shape memory alloy wire.

[0019] After adopting the above technical solution, the bile secreted by the liver will flow into the intestine through the bile duct. After installing the disposable anti-reflux biliary stent of the embodiment of the present application, the bile in the bile duct will first flow into the bile duct side channel and converge in the bile duct side channel. When the pressure in the bile duct side channel is large enough, the valve flap will be pushed to slide to separate from the valve seat, and then the circulation channel will be opened to allow the bile to flow from the bile duct side channel through the circulation channel into the intestinal side channel, and then discharged into the intestine. After the bile in the bile duct side channel is discharged, the pressure in the bile duct side channel decreases, and then the elastic component drives the valve flap to slide and reset to fit on the valve seat to close the circulation channel, so that the intestinal contents cannot flow back from the intestinal side channel into the bile duct side channel, and the intestinal contents will impact and squeeze the valve flap when refluxing, and then the valve flap can be pressed against the valve seat, so that the circulation channel is closed more tightly, effectively preventing the intestinal contents from flowing back into the bile duct, avoiding the reflux phenomenon of intestinal contents, and avoiding cholangitis caused by reflux. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic structural diagram of a disposable anti-reflux biliary stent of the utility model;

[0021] Figure 2It is a cross-sectional view of the disposable anti-reflux biliary stent of the utility model when the flow channel is opened;

[0022] Figure 3 It is a cross-sectional view of the disposable anti-reflux biliary stent of the utility model when the flow channel is closed. DETAILED DESCRIPTION

[0023] In order to make the content of the utility model more clearly understood, the utility model is further described in detail below based on specific embodiments and in conjunction with the accompanying drawings.

[0024] like Figures 1 to 3 As shown, a disposable anti-reflux biliary stent comprises a stent body 1, a valve seat 2, a valve flap 3 and an elastic component 4;

[0025] The valve seat 2 is disposed in the support body 1 and connected to the inner wall of the support body 1;

[0026] The stent body 1 has a bile duct side channel 5 located on one side of the valve seat 2 and an intestinal side channel 6 located on the other side of the valve seat 2;

[0027] The valve seat 2 is provided with a flow channel 7 for connecting the bile duct side channel 5 and the intestinal side channel 6;

[0028] The valve flap 3 is disposed in the intestinal side channel 6 and is slidably connected to the valve seat 2 along the axial direction of the valve seat 2;

[0029] One end of the elastic component 4 is connected to the stent body 1, and the other end of the elastic component 4 is connected to the valve flap 3. The valve flap 3 is used to slide relative to the valve seat 2 to fit on the valve seat 2 under the drive of the elastic component 4 to close the circulation channel 7. The valve flap 3 is also used to slide to separate from the valve seat 2 when subjected to the pressure in the bile duct side channel 5 to open the circulation channel 7. Specifically, the bile secreted by the liver will flow into the intestine through the bile duct. After the disposable anti-reflux biliary stent of the embodiment of the present application is installed, the bile in the bile duct will first flow into the bile duct side channel 5 and converge in the bile duct side channel 5. When the pressure in the bile duct side channel 5 is large enough, the valve flap 3 will be pushed to slide to separate from the valve seat 2, thereby opening the circulation channel 7 so that the bile passes through the circulation channel 7 from the bile duct side channel 5 and flows into the intestinal side channel 6, and then discharged into the intestine. When the bile in the bile duct side channel 5 is discharged, the pressure in the bile duct side channel 5 becomes smaller, and then the elastic component 4 will drive the valve flap 3 to slide back to fit on the valve seat 2 to close the circulation channel 7, so that the intestinal contents cannot flow back from the intestinal side channel 6 into the bile duct side channel 5, and the intestinal contents will impact and squeeze the valve flap 3 when refluxing, and then the valve flap 3 can be pressed against the valve seat 2, so that the circulation channel 7 is closed more tightly, effectively preventing the intestinal contents from flowing back into the bile duct, avoiding the reflux of intestinal contents, and avoiding cholangitis caused by reflux.

[0030] like Figures 1 to 3 As shown, the elastic component 4 is located in the intestinal side channel 6, and the elastic component 4 can be a conical spring, the end of the conical spring with a larger diameter is connected to the bracket body 1, and the end of the conical spring with a smaller diameter is connected to the valve flap 3; specifically, when bile needs to be discharged, the valve flap 3 slides to separate from the valve seat 2 under the pressure in the bile duct side channel 5 and compresses the conical spring, and the circulation channel 7 is opened; when the bile flows out, the conical spring drives the valve flap 3 to return to fit with the valve seat 2, and the circulation channel 7 is closed. In this embodiment, the conical spring can be but not limited to being wound by shape memory alloy wire, and the conical spring and the bracket body 1 can be welded; of course, in some embodiments, the conical spring and the bracket body 1 can also be glued.

[0031] like Figures 1 to 3As shown, the valve flap 3 can be slidably connected to the valve seat 2 through a sliding rod portion 8; wherein the sliding rod portion 8 is connected to the valve flap 3, and the valve seat 2 is provided with sliding matching holes corresponding to the sliding rod portion 8 one by one, and the sliding rod portion 8 is slidably connected in the sliding matching holes, thereby enabling the valve flap 3 to slide relative to the valve seat 2; specifically, the sliding rod portion 8 is used to guide the sliding of the valve flap 3, and the valve seat 2 can be glued to the inner wall of the bracket body 1.

[0032] like Figures 1 to 3 As shown, one end of the slide rod portion 8 is connected to the valve flap 3 , and the other end of the slide rod portion 8 is provided with an anti-slip step portion 9 to prevent the valve flap 3 from falling off the valve seat 2 .

[0033] Specifically, at least two slide rod portions 8 may be sequentially provided along the circumferential direction; in the present embodiment, two slide rod portions 8 are provided.

[0034] like Figures 1 to 3 As shown, one end of the valve seat 2 facing the bile duct side channel 5 may be provided with a guide cone portion 10 for guiding the bile in the bile duct side channel 5 to flow into the circulation channel 7 .

[0035] like Figures 1 to 3 As shown, one end of the valve seat 2 facing the intestinal side channel 6 may be provided with a fitting conical surface portion 11 for fitting with the valve flap 3 , and the valve flap 3 is a conical structure adapted to the fitting conical surface portion 11 .

[0036] like Figures 1 to 3 As shown, an end of the valve flap 3 facing away from the valve seat 2 may be provided with a concave cavity 12 .

[0037] Specifically, the stent body 1 may include a skeleton and a coating covering the skeleton, and the skeleton is formed by winding shape memory alloy wire.

[0038] To summarize, the bile secreted by the liver will flow into the intestine through the bile duct. After the disposable anti-reflux biliary stent of the embodiment of the present application is installed, the bile in the bile duct will first flow into the bile duct side channel 5 and converge in the bile duct side channel 5. When the pressure in the bile duct side channel 5 is large enough, the valve flap 3 will be pushed to slide apart from the valve seat 2, thereby opening the circulation channel 7 to allow the bile to pass through the circulation channel 7 from the bile duct side channel 5 and then flow into the intestinal side channel 6, and then be discharged into the intestine. When the bile in the bile duct side channel 5 is discharged, the pressure in the bile duct side channel 5 becomes smaller, and then the elastic component 4 will drive the valve flap 3 to slide back to fit on the valve seat 2 to close the circulation channel 7, so that the intestinal contents cannot flow back from the intestinal side channel 6 into the bile duct side channel 5, and the intestinal contents will impact and squeeze the valve flap 3 when refluxing, and then the valve flap 3 can be pressed against the valve seat 2, so that the circulation channel 7 is closed more tightly, effectively preventing the intestinal contents from flowing back into the bile duct, avoiding the reflux of intestinal contents, and avoiding cholangitis caused by reflux.

[0039] The specific embodiments described above further illustrate the technical problems, technical solutions and beneficial effects solved by the present invention. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A disposable anti-reflux biliary stent, characterized in that: It comprises a support body (1), a valve seat (2), a valve flap (3) and an elastic component (4); The valve seat (2) is arranged in the support body (1) and connected to the inner wall of the support body (1); The stent body (1) has a bile duct side channel (5) located on one side of the valve seat (2) and an intestinal side channel (6) located on the other side of the valve seat (2); The valve seat (2) is provided with a flow channel (7) for connecting the bile duct side channel (5) and the intestinal tract side channel (6); The valve flap (3) is arranged in the intestinal side channel (6) and is slidably connected to the valve seat (2) along the axial direction of the valve seat (2); One end of the elastic component (4) is connected to the bracket body (1), and the other end of the elastic component (4) is connected to the valve flap (3). The valve flap (3) is used to slide relative to the valve seat (2) under the drive of the elastic component (4) until it fits on the valve seat (2) to close the circulation channel (7). The valve flap (3) is also used to slide to separate from the valve seat (2) when subjected to pressure in the bile duct side channel (5) to open the circulation channel (7).

2. The disposable anti-reflux biliary stent according to claim 1, characterized in that: The elastic component (4) is located in the intestinal side channel (6).

3. The disposable anti-reflux biliary stent according to claim 2, characterized in that: The elastic component (4) is a conical spring, the end of the conical spring with a larger diameter is connected to the bracket body (1), and the end of the conical spring with a smaller diameter is connected to the valve flap (3).

4. The disposable anti-reflux biliary stent according to claim 1, characterized in that: The valve flap (3) is slidably connected to the valve seat (2) via a sliding rod portion (8); wherein the sliding rod portion (8) is connected to the valve flap (3), and the valve seat (2) is provided with a sliding matching hole corresponding to the sliding rod portion (8) one by one, and the sliding rod portion (8) is slidably connected in the sliding matching hole.

5. The disposable anti-reflux biliary stent according to claim 4, characterized in that: One end of the sliding rod portion (8) is connected to the valve flap (3), and the other end of the sliding rod portion (8) is provided with an anti-slip step portion (9).

6. The disposable anti-reflux biliary stent according to claim 5, characterized in that: At least two sliding rod parts (8) are arranged in sequence along the circumferential direction.

7. The disposable anti-reflux biliary stent according to claim 1, characterized in that: An end portion of the valve seat (2) facing the bile duct side channel (5) is provided with a flow guide cone portion (10) for guiding bile in the bile duct side channel (5) to flow into the circulation channel (7).

8. The disposable anti-reflux biliary stent according to claim 1, characterized in that: An end portion of the valve seat (2) facing the intestinal side channel (6) is provided with a fitting conical surface portion (11) for fitting with the valve flap (3); the valve flap (3) is a conical structure adapted to fit with the fitting conical surface portion (11).

9. The disposable anti-reflux biliary stent according to claim 8, characterized in that: A concave cavity (12) is provided at one end of the valve flap (3) facing away from the valve seat (2).

10. The disposable anti-reflux biliary stent according to claim 1, characterized in that: The stent body (1) comprises a skeleton and a coating covering the skeleton, and the skeleton is formed by winding shape memory alloy wire.

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