Intrahepatic portal-systemic venous shunt stent

Abstract

The present invention relates to the field of medical technology, and in particular to an intrahepatic portosystemic venous shunt stent, comprising a tubular inner coating, one end of the inner coating expanding outwards to form an inner coating flare, an outer metal mesh tightly fitted on the outer wall of the inner coating, one end of the outer metal mesh expanding outwards to form a bare area of ​​the metal mesh flare, a plurality of metal balls are arranged at the intersection of the bare area of ​​the metal mesh flare and the end of the inner coating flare, and the stent is tightly fitted to the portal vein vessel wall by expanding the opening part of one end of the coated stent in a "trumpet" shape, and using four metal marking points as the boundary between the coated part and the metal mesh part of the expanded part, so as to minimize the influence on the blood flow at the distal end of the portal vein shunt, reduce the tissue regeneration in the stent, prevent the stent from occlusion and "capping" phenomenon, and can accurately position the stent under DSA, so as to be suitable for precise intrahepatic portosystemic venous shunt, in particular, precise intrahepatic portosystemic venous shunt via the left branch of the portal vein.

Description

Technical Field

[0001] The invention relates to the field of medical technology, in particular to an intrahepatic portal-systemic venous shunt stent. Background Art

[0002] At present, the stents used in TIPS surgery are divided into bare stents and covered stents. Bare stents are easily caused to restenosis of the shunt channel due to the stimulation of high-speed blood flow after surgery, which leads to the formation of pseudointima; covered stents can greatly prolong the patency of the shunt channel, but the stent is easy to affect the portal vein blood flow after entering the portal vein; and the "capping" phenomenon is easy to appear at both ends of the stent. The existing covered stents are not suitable for the needs of precise shunt of intrahepatic portal-systemic veins. In addition, the internal diameter of the covered stent in the prior art is fixed, which is difficult to meet the situation where the intrahepatic portal-systemic vein needs to frequently adjust the venous flow rate. In view of this, we propose an intrahepatic portal-systemic vein shunt stent. Summary of the invention

[0003] The object of the present invention is to provide an intrahepatic portal-systemic vein shunt stent to solve the problem that the covered stent proposed in the above background technology is not suitable for the need of precise intrahepatic portal-systemic vein shunt.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] An intrahepatic portal vein shunt stent comprises a tubular inner covering membrane, one end of the inner covering membrane expands outwards to form an inner covering membrane flare, an outer metal mesh is tightly attached to the outer wall of the inner covering membrane, one end of the outer metal mesh expands outwards to form a metal mesh flare bare area, and a plurality of metal balls are arranged at the intersection of the metal mesh flare bare area and the inner covering membrane flare end;

[0006] Two clamping blocks are symmetrically arranged on the inner wall of the other end of the inner covering film, and an adjusting component is arranged between the two clamping blocks. The adjusting component comprises an outer grille and an inner grille embedded in the outer grille.

[0007] Preferably, each of the clamping blocks is provided with a square groove on one side close to the adjusting component, and a group of arc-shaped metal sheets are provided on the inner walls on both sides of the square groove, the two groups of arc-shaped metal sheets are symmetrically distributed, and each group of the arc-shaped metal sheets is provided with two sheets.

[0008] Preferably, two slots are symmetrically provided on the side wall of the outer grille in the radial direction, and a protrusion is provided on the inner end wall of each slot.

[0009] Preferably, the card slot is plug-fitted with the card block, the protrusion is plug-fitted with the square slot, and each protrusion is plug-fitted between two arc-shaped metal sheets on the same side thereof.

[0010] Preferably, a plurality of fan-shaped through grooves are provided in an annular shape at equal intervals on the surface of the outer grille, and a grille groove rotatably connected to the inner grille is provided on the inner side of the outer grille.

[0011] Preferably, a plurality of fan-shaped baffles are provided on the surface of the inner grille, and the number and shape of the fan-shaped baffles correspond to the fan-shaped through grooves.

[0012] Preferably, a rotating shaft is coaxially connected to the center of the inner grille, and a straight slot is radially opened on the rotating shaft to completely penetrate the rotating shaft.

[0013] Preferably, the number of the metal balls is at least four and they are distributed in a ring-like shape with equal intervals.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The present invention expands the opening part of one end (portal vein end) of the coated stent into a "trumpet-shaped" shape, and uses four metal marking points on the expanded part as the boundary between the coated part and the metal mesh part, so that the stent fits closely to the portal vein wall, minimizes the impact on the blood flow at the distal end of the portal vein shunt, reduces tissue regeneration in the stent, prevents stent occlusion and "capping" (the hepatic vein end or portal vein end of the stent is covered by the vascular wall), and can accurately position the stent under DSA, which is suitable for precise intrahepatic portosystemic shunt, especially precise intrahepatic portosystemic shunt via the left branch of the portal vein.

[0016] 2. The present invention adds an easily detachable adjustment component to the other end of the coated stent, and adjusts the diameter of the coated stent by adjusting the overlapping area of ​​the fan-shaped baffle and the fan-shaped through groove, thereby adjusting the flow rate. The operation is simple and convenient. In some special circumstances, when the flow rate and flow rate of the coated stent need to be adjusted, there is no need to replace the coated stent, which greatly reduces the damage to the patient's body. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the overall structure of the present invention from one perspective;

[0018] Figure 2 It is a schematic diagram of the overall structure of another viewing angle in the present invention;

[0019] Figure 3 It is a schematic diagram of the structure of the inner coating in the present invention;

[0020] Figure 4 For the present invention Figure 3 A schematic diagram of the structure enlargement at the center A;

[0021] Figure 5 It is a structural schematic diagram of the regulating component in the present invention;

[0022] Figure 6 It is a schematic diagram of the structure of the outer grille in the present invention;

[0023] Figure 7 It is a schematic structural diagram of the inner grille in the present invention.

[0024] In the figure: 1. inner coating; 10. inner coating expansion; 11. clamping block; 12. square groove; 13. arc-shaped metal sheet; 130. clamping plate; 1300. slide groove; 131. sliding locking pin; 132. push handle; 2. outer metal mesh; 20. bare area of ​​metal mesh expansion; 21. metal ball; 3. adjustment component; 30. outer grille; 300. fan-shaped through groove; 301. clamping groove; 302. protrusion; 303. grille groove; 31. inner grille; 310. fan-shaped baffle; 311. rotating shaft; 312. straight groove. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] In the description of the present invention, 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" 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 invention and simplifying the description, and do not indicate or imply that the referred device or element 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 invention.

[0027] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0028] See also Figure 1-7 , the present invention provides a technical solution:

[0029] An intrahepatic portal vein shunt stent comprises a tubular inner covering 1, one end of which expands outward to form an inner covering flared opening 10, an outer metal mesh 2 is tightly attached to the outer wall of the inner covering 1, one end of the outer metal mesh 2 expands outward to form a metal mesh flared bare area 20, and a plurality of metal balls 21 are arranged at the intersection of the metal mesh flared bare area 20 and the end of the inner covering flared opening 10;

[0030] Specifically, the number of metal balls 21 is at least four, preferably four in this embodiment, and they are evenly spaced and distributed in a ring shape, serving as a partial boundary between the inner coating 1 and the outer metal mesh 2 , so that the boundary of the coated stent can be clearly distinguished under X-rays.

[0031] In addition, the outward expansion angle of the coating expansion opening 10 is 120°, so that the stent fits closely with the portal vein wall, minimizing the impact on the blood flow at the distal end of the portal vein shunt.

[0032] In order to ensure that the flow rate and flow velocity of the stent graft need to be adjusted in some special situations, the inventors have added a regulating component 3 in the stent graft as a preferred embodiment. Figure 3-7 As shown, two clamping blocks 11 are symmetrically arranged on the inner wall of the other end of the inner covering film 1 , and an adjusting component 3 is arranged between the two clamping blocks 11 . The adjusting component 3 includes an outer grille 30 and an inner grille 31 embedded in the outer grille 30 .

[0033] In this embodiment, each block 11 is provided with a square groove 12 on one side close to the adjustment component 3, and a group of arc-shaped metal sheets 13 are provided on the inner walls of both sides of the square groove 12. The two groups of arc-shaped metal sheets 13 are symmetrically distributed, and each group of arc-shaped metal sheets 13 is provided with two. Two slots 301 are symmetrically provided on the side wall of the outer grille 30 in the radial direction, and a protrusion 302 is provided on the inner end wall of each slot 301. The slot 301 is plugged into the block 11, and the protrusion 302 is plugged into the square groove 12. The groove 12 is plug-in-fitted, and each protrusion 302 is clamped between the two arc-shaped metal sheets 13 on the same side thereof, and is sleeved on the outside of the clamping block 11 through the clamping groove 301 on the side wall of the outer grille 30. At the same time, the protrusion 302 is embedded between the arc-shaped metal sheets 13 on the inner wall of the square groove 12. When clamped in, the arc-shaped metal sheets 13 are deformed due to their elasticity. The protrusion 302 passes over the arc-shaped metal sheets 13 and is clamped between them, thereby fixing the adjustment component 3 and can be easily disassembled when not needed.

[0034] Furthermore, a plurality of fan-shaped through grooves 300 are provided in a circular shape at equal intervals, a grille groove 303 rotatably connected to the inner grille 31 is provided on the inner side of the outer grille 30, and a plurality of fan-shaped baffles 310 are provided on the surface of the inner grille 31, and the number and shape of the fan-shaped baffles 310 correspond to the fan-shaped through grooves 300. By concentrically rotating the inner grille 31 in the grille grooves 303, the overlapping area of ​​the fan-shaped baffles 310 and the fan-shaped through grooves 300 can be adjusted to adjust the diameter of the coated stent, thereby adjusting the flow rate.

[0035] In addition, a rotating shaft 311 is coaxially connected to the center of the inner grille 31, and a straight slot 312 is radially opened on the rotating shaft 311 to completely penetrate the rotating shaft. By using a slender hook to hook the straight slot 312 and rotate it, the rotation of the inner grille 31 can be adjusted, and the adjustment component 3 can be removed by hooking the straight slot 312 and pulling it outward.

[0036] When the intrahepatic portal-systemic venous shunt stent of this embodiment is in use, the coated stent is implanted as a whole into the venous vessel wall, and the adjustment component 3 can be installed or not installed as needed. When it needs to be installed, the adjustment component 3 is inserted into the tube wall at one end of the inner coating 1 in advance. When it is inserted, the arc-shaped metal sheet 13 is deformed due to its elasticity. The protrusion 302 passes over the arc-shaped metal sheet 13 and is stuck between it to fix the adjustment component 3. The inner grille 31 can be adjusted to rotate by hooking the straight slot 312 with a slender hook, thereby adjusting the overlapping area of ​​the fan-shaped baffle 310 and the fan-shaped slot 300 to adjust the diameter of the coated stent, and then adjust the flow rate. When it is not needed, the adjustment component 3 can be removed by hooking the straight slot 312 with a slender hook and pulling it outward.

[0037] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An intrahepatic portal-systemic venous shunt stent, comprising a tubular inner covering (1), characterized in that: One end of the inner film (1) expands outwards to form an inner film expansion opening (10), and the outward expansion angle of the inner film expansion opening (10) is 120 degrees. A layer of outer metal mesh (2) is tightly attached to the outer wall of the inner film (1), and one end of the outer metal mesh (2) expands outwards to form a metal mesh expansion opening bare area (20). A plurality of metal balls (21) are provided at the intersection of the metal mesh expansion opening bare area (20) and the end of the inner film expansion opening (10); two clamping blocks (11) are symmetrically provided on the inner wall of the other end of the inner film (1). ), an adjustment component (3) is provided between the two clamping blocks (11), the adjustment component (3) comprising an outer grille (30) and an inner grille (31) embedded in the outer grille (30); a square groove (12) is provided on one side of each clamping block (11) close to the adjustment component (3), a group of arc-shaped metal sheets (13) are provided on the inner walls on both sides of the square groove (12), the two groups of arc-shaped metal sheets (13) are symmetrically distributed, and the number of arc-shaped metal sheets (13) in each group is two; the outer grille ( Two slots (301) are symmetrically provided in the radial direction on the side wall of the outer grille (30), and a protrusion (302) is provided on the inner end wall of each slot (301); the slots (301) are plug-fitted with the block (11), the protrusion (302) is plug-fitted with the square groove (12), and each protrusion (302) is plug-fitted between two arc-shaped metal sheets (13) on the same side thereof; a plurality of fan-shaped through slots (300) are provided in an annular shape at equal intervals on the surface of the outer grille (30), and a plurality of fan-shaped through slots (300) are provided on the inner end wall of the outer grille (30). A grille slot (303) rotatably connected to the inner grille (31) is provided on the side; a plurality of fan-shaped baffles (310) are provided on the surface of the inner grille (31), the number and shape of the fan-shaped baffles (310) corresponding to the fan-shaped through slots (300); a rotating shaft (311) is coaxially connected at the center of the inner grille (31), and a straight slot (312) is provided on the rotating shaft (311) in a radial direction to completely penetrate the rotating shaft; and the number of the metal balls (21) is at least four, and they are distributed in a ring-shaped manner with equal spacing.

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