Anti-migration anchoring stent for biliary drainage during ERCP

Abstract

The present invention provides an anti-displacement anchoring stent for bile duct drainage during ERCP, characterized in that: it comprises an anchoring stent body; wherein the anchoring stent body has an anchoring member and a tumor positioning member; the anchoring member is convexly arranged on the surface of the anchoring stent body; the tumor positioning member is concavely arranged on the anchoring stent body. The stent can play the role of anchoring and preventing displacement.

Description

Technical Field

[0001] The invention relates to a medical device, in particular to an anti-displacement anchoring stent for bile duct drainage during ERCP. Background Art

[0002] ERCP is the first-line treatment for palliative drainage of malignant bile duct stenosis. There are currently different stent drainage schemes for malignant distal bile duct stenosis. The most widely used is bare metal stent drainage, but it has a high re-obstruction rate due to tumor progression and invasion. The coated metal stent is protected by the coating to prevent tumor invasion into the stent cavity, and a longer stent patency period can be obtained, but the stent migration rate is high, so reducing the migration of the coated metal stent is particularly urgent. Summary of the invention

[0003] The present invention aims to overcome the above-mentioned defects, solve the problem of stent displacement, and provide an anti-displacement anchoring stent for biliary drainage during ERCP, which reduces the occurrence of displacement of the coated metal stent by combining the implantation of the anchoring stent.

[0004] The anti-displacement anchoring stent for biliary drainage during ERCP provided by the present invention is characterized by comprising an anchoring stent body;

[0005] Wherein, the anchoring stent body mentioned above has an anchoring member and a tumor positioning member;

[0006] The above-mentioned anchoring member is arranged on the surface of the anchoring bracket body in an outward convex shape; the surface here can refer to a single surface or a double surface.

[0007] The tumor positioning element is arranged on the anchoring stent body in an inwardly concave manner. The body position here may refer to a single surface or to both surfaces.

[0008] Furthermore, the anti-displacement anchoring stent for biliary drainage during ERCP provided by the present invention is also characterized in that:

[0009] The anchoring bracket body is in a flat strip-shaped configuration.

[0010] Furthermore, the anti-displacement anchoring stent for biliary drainage during ERCP provided by the present invention is also characterized in that:

[0011] The surface of the anchoring bracket body is a concave surface.

[0012] Furthermore, the anti-displacement anchoring stent for biliary drainage during ERCP provided by the present invention is also characterized in that:

[0013] The curvature of the concave surface fits the outer surface of the metal bracket. That is, according to the difference of the metal bracket, anchor brackets with different matching specifications can be manufactured.

[0014] Furthermore, the anti-displacement anchoring stent for biliary drainage during ERCP provided by the present invention is also characterized in that:

[0015] The anchoring members are located at two ends of the anchoring bracket body.

[0016] Furthermore, the anti-displacement anchoring stent for biliary drainage during ERCP provided by the present invention is also characterized in that:

[0017] The anchors are arranged on the surface of the stent body in an array or based on the arrangement of metal stent meshes.

[0018] Furthermore, the anti-displacement anchoring stent for biliary drainage during ERCP provided by the present invention is also characterized in that:

[0019] The tumor positioning element is located in the middle section of the anchoring stent body.

[0020] Furthermore, the anti-displacement anchoring stent for biliary drainage during ERCP provided by the present invention is also characterized in that:

[0021] The tumor positioning elements are arranged in an array on the surface of the support body.

[0022] When it is a double surface, the tumor positioning elements are preferably staggered.

[0023] Furthermore, the anti-displacement anchoring stent for biliary drainage during ERCP provided by the present invention is also characterized in that:

[0024] The above-mentioned anchoring member is of any geometric shape;

[0025] The above-mentioned tumor positioning element can be of any geometric shape.

[0026] Furthermore, the anti-displacement anchoring stent for biliary drainage during ERCP provided by the present invention is also characterized in that:

[0027] The anchoring stent body mentioned above also has a guide wire channel that runs through the entire length direction of the anchoring stent body.

[0028] Beneficial effects of the present invention:

[0029] Based on the enhanced effect of the anchored stent design, this design provides a new method and reduces the migration of the covered metal stent during ERCP for the placement of metal covered stents for malignant stenosis of the distal bile duct. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the overall appearance of the anchor bracket;

[0031] Figure 2It is a schematic diagram of the cross-section of the anchoring protrusions at both ends of the anchoring bracket;

[0032] Figure 3 It is a schematic diagram of the cross section of the central hollow cavity of the anchoring bracket;

[0033] Figure 4 This is a schematic diagram of the specific implementation when the anchoring stent and the coated metal stent are placed in parallel. DETAILED DESCRIPTION

[0034] The present invention will be further described below in conjunction with the accompanying drawings.

[0035] like Figure 1-3 As shown, the anti-displacement anchoring stent for biliary drainage during ERCP provided in this embodiment comprises an anchoring stent body 1;

[0036] The anchoring bracket body 1 is characterized by being flat and long in shape from the overall appearance, and the flat surface of the long strip is slightly concave, and the curvature matches the cylindrical surface of the expanded metal bracket.

[0037] The anchoring stent body 1 comprises an anchoring member 2 and a tumor positioning member 3;

[0038] The anchoring member 2 is a granular object with an outward protrusion, and is arranged on the surface of the anchoring stent body 1. After the coated metal stent is expanded and opened, it can be partially pressed into the coated mesh due to pressure, thereby reducing the movement of the stent.

[0039] The particle-shaped protrusions can be in the shape of columns, trapezoids, triangles, inverted triangles, or various small particle-shaped protrusions.

[0040] The anchoring member 2 is located at the two end portions A of the entire stent;

[0041] The tumor positioning member 3 is in the shape of an inwardly concave hollow cavity and is disposed on the anchoring stent body 1. Based on the hollow design of the hollow cavity, the cavity can accommodate the invading tumor tissue, thereby properly anchoring the anchoring stent to the surrounding tissue.

[0042] The central hollow cavity is rectangular, circular, elliptical, triangular or any other open shape, and is hollow inside.

[0043] The tumor positioning element 3 is located at the middle portion A of the entire stent.

[0044] In addition, since the stent needs to be implanted with the aid of a guide wire, the anchoring stent body 1 also has a guide wire channel 4 that runs through the entire length direction of the anchoring stent body and is a circular or elliptical hole.

[0045] like Figure 4 As shown, when the anchoring stent and the coated metal stent are placed in parallel, the specific implementation state is:

[0046] According to the morphology when the anchoring stent 1 and the coated metal stent 5 are placed in parallel, tumor tissue invasion can be seen in the central hollow cavity, and the anchoring protrusions at both ends are embedded in the coated mesh of the coated metal stent due to expansion pressure. 5 is the coated metal stent.

[0047] It can be seen that the design scheme of this embodiment is mainly a flat long strip bracket, and the two long strip surfaces of the bracket are slightly concave toward the center, and the arc of the concave fits with the surface of the cylindrical coated bracket, and there are a large number of anti-displacement anchoring protrusions on the concave surfaces at both ends and a large number of hollow cavities on the central concave surface. When the anchor bracket and the coated metal bracket are placed in parallel, the externally pressed tumor tissue enters the large number of hollow cavities on the central concave surface of the anchor bracket, and the invading tumor tissue can anchor the anchor bracket in place, and the large number of anchoring protrusions at both ends of the concave surface of the anchor bracket can be anchored in the mesh of the coated metal bracket due to the expansion pressure of the coated metal bracket, thereby utilizing the anchoring effect of the anchor bracket and the tumor tissue and the anchoring protrusions at both ends of the anchor bracket that fit in the mesh of the metal bracket to achieve the effect of resisting the displacement of the metal bracket.

Claims

1. Anti-displacement anchoring stent for biliary drainage during ERCP, characterized in that: An anchoring bracket body is included; Wherein, the anchoring stent body comprises an anchoring member and a tumor positioning member; The anchor is in the shape of a flat strip, and the flat surface of the strip is a concave surface. The curvature of the concave surface matches the cylindrical surface of the expanded metal stent, and the anchor is anchored at the mesh of the coated metal stent due to the expansion pressure of the metal stent. The tumor positioning piece is arranged on the anchoring support body in an inwardly concave manner to accommodate the entry of tumor tissue under external pressure.

2. The anti-displacement anchoring stent for biliary drainage during ERCP according to claim 1, characterized in that: The anchoring members are located at two ends of the anchoring bracket body.

3. The anti-displacement anchoring stent for biliary drainage during ERCP according to claim 1, characterized in that: The anchoring elements are arranged on the surface of the anchoring stent body in an array or based on a metal stent mesh arrangement.

4. The anti-displacement anchoring stent for biliary drainage during ERCP according to claim 1, characterized in that: The tumor positioning element is located in the middle section of the anchoring stent body.

5. The anti-displacement anchoring stent for biliary drainage during ERCP according to claim 1, characterized in that: The tumor positioning elements are arranged in an array on the surface of the anchoring support body.

6. The anti-displacement anchoring stent for biliary drainage during ERCP according to claim 1, characterized in that: The anchoring member is of any geometric shape; The tumor positioning element can be of any geometric shape.

7. The anti-displacement anchoring stent for biliary drainage during ERCP according to claim 1, characterized in that: The anchoring stent body also has a guide wire channel that runs through the entire length direction of the anchoring stent body.

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