Film-coated metal inner stent

Abstract

The utility model relates to a film-covered metal inner stent which comprises a stent body, the stent body comprises a metal frame, an inner film-covered layer and an outer film-covered layer, the inner film-covered layer and the outer film-covered layer are wrapped on the inner surface and the outer surface of the metal frame respectively, and a flow guide pipe is arranged at one end of the stent body. The catheter comprises a first end face and a second end face, the diameter of the first end face is larger than that of the second end face, the second end face is connected with the stent body, and an annular air bag is arranged outside the catheter. The catheter and the air bag are arranged at the upper part of the stent body, so that the stent can be better clamped at the pylorus part, the stent body is prevented from continuously sliding towards the intestinal tract, and the positioning problem of the covered stent at the pylorus part is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a coated metal internal stent. Background Art

[0002] Medical metal stents are a commonly used technical means in clinical hospitals. Reasonable use of metal stents can play an excellent auxiliary role in the treatment process. The existing medical metal pipeline stents will not have many problems during the actual operation and implantation process. However, the coated metal stents currently used in the pylorus often have technical problems such as displacement due to gastric peristalsis, but there are currently no more measures to prevent displacement. Utility Model Content

[0003] In order to overcome the problems existing in the related art, an embodiment of the utility model provides a coated metal inner stent, which solves the technical problem of displacement of the coated stent.

[0004] The utility model provides a coated metal inner stent, comprising a stent body, the stent body comprising a metal frame and an inner coating layer and an outer coating layer respectively wrapped around the inner and outer surfaces of the metal frame, a guide tube is arranged at one end of the stent body, the guide tube comprises a first end face and a second end face, the diameter of the first end face is greater than the diameter of the second end face, and the second end face is connected to the stent body.

[0005] Through the above technical solution, a guide tube is arranged on the upper part of the stent body. The diameter of the first end face of the guide tube is larger than the diameter of the second end face so that the guide tube can be stuck in the pylorus to prevent the stent body from continuing to slide toward the intestine, thereby solving the positioning problem of the coated stent in the pylorus.

[0006] In one embodiment, the side surface of the guide tube is a curved surface and is recessed toward the inside of the guide tube. By providing the recess, the contact area between the guide tube and the pylorus is increased, further improving the positioning effect.

[0007] In one embodiment, an annular airbag is provided outside the guide tube, and the end face of the airbag is flush with or lower than the first end face of the guide tube. The airbag is provided outside the guide tube, and the positioning problem at the pylorus can be ensured by inflating the airbag. When removing the guide tube, it is convenient to remove the guide tube by simply releasing the gas in the airbag.

[0008] In one embodiment, the airbag is in the shape of a ring, and the ring-shaped airbag has a simple structure and is easy to produce and manufacture.

[0009] In one embodiment, the airbag is provided with a valve for inflation and deflation, and the valve is connected to an external inflation and deflation mechanism through a pipeline to facilitate inflation and deflation operations, and the valve and the pipeline are connected by a detachable structure, such as a snap or threaded structure.

[0010] In one embodiment, a skirt is provided at the other end of the stent body. The skirt can withstand pressure and reduce the rejection of the pylorus.

[0011] In one embodiment, the skirt includes a connecting portion and a serrated portion, and the serrated portion is a triangular structure, which is easy to produce and manufacture.

[0012] In one embodiment, the serrated portion includes a soft material layer, the material of the soft material layer is silicone, and the serrated portion is not provided with a wire mesh, so it is easy to deform and reduce stress response.

[0013] In one embodiment, the inner coating layer and the outer coating layer are made of silicone or biological membranes to reduce the possibility of rejection reaction in the body.

[0014] In one embodiment, the metal frame is woven from steel wires.

[0015] The technical solution provided by the embodiments of the utility model may include the following beneficial effects: by arranging a positioning guide tube on the stent body, the structure of the guide tube prevents the stent as a whole from being displaced in the pylorus, and at the same time, an airbag is arranged on the outside of the guide tube, and the size of the guide tube is changed and the stent is installed and removed by inflation and deflation of the airbag.

[0016] It should be understood that the above general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings herein are incorporated in and constitute a part of the specification, illustrate embodiments consistent with the present utility model, and together with the description, are used to explain the principles of the present utility model.

[0018] Figure 1 This is a three-dimensional structural diagram of a coated metal inner stent described in the utility model;

[0019] Figure 2 It is a longitudinal cross-sectional view of a coated metal stent described in the utility model;

[0020] Figure 3 This is a cross-sectional view of a coated metal inner stent described in the utility model.

[0021] In the figure, the stent body 100 , the metal frame 110 , the outer coating layer 120 , the inner coating layer 130 , the flow guide tube 200 , the first end surface 210 , the second end surface 220 , the airbag 300 , the valve 310 , the skirt 400 , the connecting portion 410 , and the serrated portion 420 . DETAILED DESCRIPTION

[0022] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on this patent; in order to better illustrate the embodiments of the utility model, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0023] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "inner", "outer", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0024] In the description of the present invention, unless otherwise clearly specified and limited, if the term "connection" or the like appears to indicate the connection relationship between components, the term should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two components or the interaction relationship between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] Reference Figure 1-Figure 3 As shown, the utility model discloses a coated metal inner stent, which includes a stent body 100, and the stent body 100 includes a metal frame 110 and an inner coating layer 130 and an outer coating layer 120, the inner coating layer 130 is wrapped around the inner surface of the metal frame 110, and the outer coating layer 120 is wrapped around the outer surface of the metal frame 110.

[0026] A guide tube 200 is disposed at one end of the support body 100. The guide tube 200 includes a first end surface 210 and a second end surface 220. The diameter of the first end surface 210 is larger than the diameter of the second end surface 220. The side surface of the guide tube 200 is a curved surface and is recessed inside the guide tube 200. The second end surface 220 is connected to the support body 100.

[0027] A circular airbag 300 is disposed outside the flow guide tube 200. The shape of the airbag 300 is preferably a circular ring, and may also be designed as a rounded rectangle or other shapes, which are not listed here. The end surface of the airbag 300 is flush with or lower than the first end surface 210 of the flow guide tube 200. A valve 310 for inflation and deflation is disposed on the airbag 300. The metal frame 110 is made of steel wire woven into a metal pipe network structure.

[0028] Preferably, the flow guide tube 200 and the stent body 100 are made in one piece, and the flow guide tube 200 is also composed of a metal frame 110 and an inner film layer 130 and an outer film layer 120 respectively wrapped on the inner and outer surfaces of the metal frame 110. The metal frame 110 can support the inner film layer 130 and the outer film layer 120 to maintain the stability of the shape.

[0029] When in use, the gas inside the balloon 300 is firstly evacuated, and then the stent body 100 is placed in the pylorus to the designated position and then positioned through the guide tube 200. The inwardly concave side of the guide tube 200 increases the contact area with the pylorus, thereby improving the positioning effect. Then, it is connected to the valve 310 through a pipeline (not shown), and can be connected through a detachable structure such as a buckle and a thread. The connection method belongs to the technical means well known to those skilled in the art, and will not be described here.

[0030] After the pipeline is connected to the valve 310, the airbag 300 is expanded by inflating it with an inflator or other equipment. After completion, the pipeline is disassembled and taken out so that it can be better stuck at the pylorus to prevent it from displacement. After the treatment is completed, the pipeline is connected to the valve 310 again, and the airbag 300 is deflated to shrink so that it can be smoothly taken out.

[0031] In order to reduce the rejection reaction of the human body, a skirt 400 is provided at the other end of the stent body 100. The skirt 400 includes a connecting portion 410 and a serrated portion 420. The serrated portion 420 is a triangular structure. The serrated portion 420 includes a soft material layer (not shown), the material of the soft material layer is silicone, and the serrated portion 420 is only provided with the soft material layer, and the wire mesh metal frame 110 is not provided. The material of the inner film layer 130 and the outer film layer 120 is silicone. Preferably, three serrated portions 420 are provided, and the three serrated portions 420 are evenly distributed at one end of the stent body 100 to improve the balance of clamping.

[0032] The diameter of the connecting portion 410 is larger than the diameter of the stent body 100, and the transition surface is a curved surface protruding outward. A skirt 400 without a wire mesh is used at the other end of the stent body 100, and the material of the skirt 400 is consistent with the coating material. Silicone is preferably used in this embodiment, which has a higher affinity with the human body. Of course, those skilled in the art can also use other materials as needed, which are not listed here one by one. The serrated portion is not provided with a wire mesh, which is more conducive to the pyloric compression of the skirt 400 to avoid rejection by the body.

[0033] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and practicing the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present invention, which follow the general principles of the present invention and include common knowledge or customary technical means in the art that are not disclosed in the present invention. The specification and examples are to be regarded as exemplary only, and the true scope and spirit of the present invention are indicated by the following claims.

[0034] It should be understood that the present invention is not limited to the precise structure described above and shown in the drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A coated metal stent, comprising a stent body (100), characterized in that: The stent body (100) comprises a metal frame (110) and an inner coating layer (130) and an outer coating layer (120) respectively wrapped around the inner and outer surfaces of the metal frame (110); a flow guide tube (200) is provided at one end of the stent body (100); the flow guide tube (200) comprises a first end surface (210) and a second end surface (220); the diameter of the first end surface (210) is greater than the diameter of the second end surface (220); and the second end surface (220) is connected to the stent body (100).

2. The coated metal stent according to claim 1, characterized in that: The side surface of the flow guide pipe (200) is a curved surface and is recessed toward the interior of the flow guide pipe (200).

3. The coated metal stent according to claim 1, characterized in that: An annular air bag (300) is arranged outside the flow guide tube (200), and an end surface of the air bag (300) is flush with or lower than the first end surface (210) of the flow guide tube (200).

4. The coated metal stent according to claim 3, characterized in that: The airbag (300) is in the shape of a ring.

5. The coated metal stent according to claim 3, characterized in that: The airbag (300) is provided with a valve (310) for inflation and deflation.

6. The coated metal stent according to claim 1, characterized in that: The other end of the bracket body (100) is provided with a skirt (400).

7. The coated metal stent according to claim 6, characterized in that: The skirt (400) comprises a connecting portion (410) and a serrated portion (420), and the serrated portion (420) is a triangular structure.

8. The coated metal stent according to claim 7, characterized in that: The sawtooth portion (420) comprises a soft material layer, and the material of the soft material layer is silicone.

9. The coated metal stent according to claim 8, characterized in that: The inner film layer (130) and the outer film layer (120) are made of silica gel or biological membrane.

10. The coated metal stent according to claim 9, characterized in that: The metal frame (110) is woven from steel wires.

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