Cutting weaving type support

Abstract

The invention provides a cutting and weaving type stent, and belongs to the technical field of medical instruments for treating vascular diseases, the stent is provided with a supporting skeleton part obtained through cutting and a stopping net part obtained through weaving, the supporting skeleton part is provided with a plurality of cross rods which are arranged at intervals in the circumferential direction and extend in the axial direction, and the stopping net part is arranged on the supporting skeleton part. Vertical rods which are arranged at intervals in the axial direction are arranged between any two adjacent cross rods, the vertical rods are used for connecting any two adjacent cross rods, and the multiple cross rods and the multiple vertical rods are vertically and horizontally arranged to form the integrally-arranged supporting framework part; the backstop net part is provided with transverse weaving wires extending in the axial direction and vertical weaving wires extending in the circumferential direction, the transverse weaving wires are wound around vertical rods in a staggered mode, and the vertical weaving wires are wound around transverse rods in a staggered mode, so that the supporting framework part and the backstop net part are integrally and fixedly connected in a weaving mode; the technical problem that an existing double-layer support is high in layering risk is mainly solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical devices for treating vascular diseases, and in particular relates to a cutting braided stent. Background Art

[0002] Intracranial atherosclerotic stenosis is one of the main causes of ischemic stroke. Its pathophysiological process is as follows: cholesterol is deposited in the arterial wall, leading to thickening of the arterial intima, infiltration of the intima by foam cells, followed by pathological intima thickening, and eventually forming an atherosclerotic plaque with core necrosis. The atherosclerotic plaque will reduce the size of the vascular lumen, leading to vascular stenosis.

[0003] Stent implantation is a commonly used intravascular interventional treatment for intracranial atherosclerotic stenosis. In clinical practice, stents with relatively large mesh sizes are often used to treat lesions. After the stent is released, it supports the vascular lumen and squeezes atherosclerotic plaques, which can easily cause plaque rupture and detachment. The detached plaques pass through the mesh of the stent into the vascular lumen, leading to thrombosis in the distal blood vessels of the lesion.

[0004] Most existing intracranial stents are made using laser cutting technology. The mesh size of the cut stent is relatively large. If the mesh size of the stent is reduced, the radial support force of the stent will increase significantly, which will inevitably cause damage to the vascular endothelium. The mesh size of a single braided stent is small, which can effectively prevent the detached plaque from passing through the mesh of the stent and entering the vascular lumen, but its radial support force is insufficient, and it is easy to cause in-stent restenosis in the later stage.

[0005] In order to solve the above problems, a double-layer stent is usually used. The double-layer stent has a support frame with a larger mesh and a stop frame with a smaller mesh that is sleeved on the outside or inside of the support frame. The support frame is used to increase the overall radial support force of the stent, and the stop frame is used to further stop the detached plaque. However, such a double-layer stent has an obvious disadvantage, that is, the first layer and the second layer are a sleeve structure, which has a high risk of stratification, resulting in poor adhesion between the stent and the blood vessel wall, thereby increasing the incidence of intra-stent thrombosis or intra-stent restenosis.

[0006] Therefore, it is necessary to provide an improved technical solution to address the above-mentioned deficiencies in the prior art. Summary of the invention

[0007] The purpose of the present invention is to provide a cut braided stent, which mainly solves the technical problem that the existing double-layer stent has a high risk of delamination.

[0008] In order to achieve the above-mentioned purpose, the cutting braided stent of the present invention provides the following technical solutions:

[0009] A cut braided stent, comprising a support frame portion obtained by cutting and a stopper mesh portion obtained by braiding, wherein the support frame portion comprises a plurality of cross bars arranged at intervals along the circumferential direction and extending along the axial direction, and a vertical bar arranged at intervals along the axial direction is arranged between any two adjacent cross bars, and the vertical bar is used to connect any two adjacent cross bars, and the plurality of cross bars and the plurality of vertical bars are arranged vertically and horizontally to form the support frame portion which is arranged integrally;

[0010] The stop net part has transverse braided wires extending axially and vertical braided wires extending circumferentially, the transverse braided wires are staggered around the vertical rods, and the vertical braided wires are staggered around the cross rods, so that the support frame part and the stop net part are braided and fixedly connected as a whole.

[0011] As a further optimized technical solution, the cross bars are extended and arranged in a wave shape, and the wave crests and wave troughs of any two adjacent cross bars are opposite to each other.

[0012] As a further optimized technical solution, one end of each vertical rod is connected to a wave crest on one of the horizontal rods, and the other end is connected to a wave trough on another horizontal rod.

[0013] As a further optimized technical solution, the vertical rod is close to a straight line shape and forms a set angle with the vertical radial direction.

[0014] As a further optimized technical solution, the transverse braiding wires and the vertical braiding wires are both made of developing materials, so that the cut braided stent can be developed as a whole.

[0015] As a further optimized technical solution, the support skeleton part is made of nickel-titanium alloy tube or stainless steel tube through laser cutting, and the horizontal braided wire and the vertical braided wire are both double-layer structures, and the double-layer structure has an outer nickel-titanium layer and an inner platinum core.

[0016] As a further optimized technical solution, the wire diameters of the transverse braiding wires and the vertical braiding wires are the same, both of which are 0.02mm-0.03mm.

[0017] As a further optimized technical solution, the mesh size at the ends of the supporting skeleton part is larger than the mesh size in the middle between the two ends.

[0018] As a further optimized technical solution, the mesh size of the ends of the support frame part is 150mm 2 -200mm 2 , the middle mesh size between the two ends is 90mm 2 -140mm 2 The mesh area of ​​the stopper net is 0.3mm 2 -0.5mm 2 .

[0019] As a further optimized technical solution, the cut braided stent has a length of 15mm-22mm and a diameter of 2.5mm-4.5mm.

[0020] Beneficial effects: The support skeleton part can provide moderate radial support force and effectively support the stenotic lesions. The mesh size of the stopper net part is small, which can better stop the plaque and prevent the plaque from falling off, and can effectively reduce the probability of the plaque falling off from the stent mesh, and prevent microembolism after the plaque falls off. Compared with the existing single cutting stent, the stent of the present invention has a smaller mesh area and a larger coverage area for the plaque, which can effectively reduce the probability of the plaque falling off from the stent mesh. Compared with a single braided stent, the stent of the present invention has moderate radial support force and can effectively support the stenotic lesions. Compared with the double-layer stent, the cutting skeleton and the braided net of the stent of the present invention are overlapped and distributed, and the support skeleton part and the stopper net part are fixedly connected by braiding, so that the overall integrity is stronger and the risk of stent delamination is effectively reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. Among them:

[0022] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention;

[0023] Figure 2 A schematic diagram of a support frame portion of an embodiment of the present invention;

[0024] Figure 3 It is a schematic diagram of the braiding state of the transverse braiding wire and the supporting skeleton part according to one embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of the weaving state of the vertical braiding wire and the supporting skeleton part according to an embodiment of the present invention.

[0026] In the figure: 1, supporting frame part; 1a, end mesh; 1b, middle mesh; 101, horizontal rod; 102, vertical rod; 2, stopper mesh part; 201, horizontal braided wire; 202, vertical braided wire. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention belong to the scope of protection of the present invention.

[0028] In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention. The terms "connected" and "connected" used in the present invention should be understood in a broad sense. For example, they can be fixed connections or detachable connections; they can be directly connected or indirectly connected through intermediate components. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0029] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0030] The present invention provides a cut and woven stent, comprising a supporting skeleton portion obtained by cutting and a stopping mesh portion obtained by weaving, wherein the stopping mesh portion weaves the supporting skeleton portion into the stopping mesh portion during the weaving process, so that the supporting skeleton portion and the stopping mesh portion are weaved into a whole, thereby effectively improving the integrity of the stent; in addition, the mesh openings of the supporting skeleton portion are relatively large and are mainly used to support blood vessels, while the mesh openings of the stopping mesh portion are relatively small and can effectively block plaques on the blood vessel wall.

[0031] Example 1

[0032] like Figure 1 , Figure 2 As shown, the cutting braided stent has a length of 15mm-22mm (for example, it can be 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm and an interval value between any two end points according to different models), a diameter of 2.5mm-4.5mm (for example, it can be 2.5mm, 3.0mm, 3.5mm, 4.0mm, 4.5mm and an interval value between any two end points according to different models), and has a supporting skeleton part 1 and a stop mesh part 2. The supporting skeleton part 1 and the stop mesh part 2 are used to be woven into a whole, so that the stent can not only effectively support the blood vessel, but also conveniently block the plaque on the blood vessel.

[0033] Specifically, the support skeleton part 1 is formed into a mesh structure by laser cutting using nickel-titanium alloy tubes or stainless steel tubes. The support skeleton part 1 has a plurality of cross bars 101 that are evenly spaced circumferentially and extend axially. Each cross bar 101 extends from one end of the bracket to the other end of the bracket. The cross bars 101 are arranged in a wavy shape during the extension process, and when the support skeleton is in an expanded state, the crests and troughs of any two adjacent cross bars 101 are opposite.

[0034] Between any two adjacent cross bars 101, there are vertical bars 102 evenly spaced in the axial direction. One end of each vertical bar 102 is integrally fixedly connected to the crest of one cross bar 101, and the other end is integrally fixedly connected to the trough of another cross bar 101, so as to connect two adjacent cross bars 101. The vertical bars 102 are nearly straight and form a set angle with the vertical radial direction. Multiple cross bars 101 and multiple vertical bars 102 are arranged vertically and horizontally to form the above-mentioned integrally arranged support frame part 1.

[0035] The stopper mesh part 2 has a transverse braided wire 201 extending in the axial direction and a vertical braided wire 202 extending in the circumferential direction, wherein the transverse braided wire 201 is staggered around the vertical rod 102. It should be noted here that the transverse braided wire 201 is staggered around the vertical rod 102, such as Figure 3 As shown, during the weaving process, any transverse braided wire 201 enters a grid at one end of the supporting skeleton part 1, crosses the top of the vertical rod 102 to enter another grid, and then passes out from the bottom of the vertical rod 102 of another grid, and is arranged in a cycle to extend axially and pass through the other end of the supporting skeleton part 1.

[0036] Similarly, the vertical braided wires 202 are staggered around the crossbar 101, such as Figure 4 As shown, during the weaving process, any vertical braided wire 202 enters from a grid on one side of the support frame part 1, crosses the top of the crossbar 101 to enter another grid, and then passes out from the bottom of the crossbar 101 of another grid, and is arranged in a circular manner to extend circumferentially, and is circumferentially wound through the support frame part 1. Through the above-mentioned weaving method, the support frame part 1 and the stop net part 2 are woven into one, so as to obtain a cut braided stent with better integrity. There is no risk of separation between the support frame part 1 and the stop net part 2, and the stent has good radial support. At the same time, compared with a single cutting stent, the mesh size is smaller, which can more effectively block plaques on blood vessels.

[0037] Furthermore, in order to facilitate the surgical operation, the transverse braided wires 201 and the vertical braided wires 202 are both made of developing materials, so that the cut braided stent can be developed as a whole, which makes it easier for the doctor to observe the position and status of the stent during the surgical operation.

[0038] In this embodiment, the support frame part 1 uses a double-layer structure of transverse braided wires 201 and vertical braided wires 202, and the double-layer structure has an outer nickel-titanium layer and an inner platinum core. Since the inner platinum core has the property of being radiopaque, the stopper mesh part 2 can be fully visualized, that is, the cut braided stent can be fully visualized during the operation.

[0039] In this embodiment, the wire diameters of the transverse braided wires 201 and the vertical braided wires 202 are the same, both of which are 0.02 mm-0.03 mm (for example, they may be 0.02 mm, 0.03 mm, and an interval value between any two end points depending on different models).

[0040] Furthermore, the size of the end mesh 1a at both ends of the support skeleton part 1 is larger than the size of the middle mesh 1b between the two ends. Because when the stent is used, the length is usually slightly larger than the length of the lesion position to fully cover the narrow lesion position, so that the middle position of the stent is used to fully support the narrow part of the blood vessel, which requires that the support strength of the middle position of the stent is relatively large, and the two ends are in the healthy position of the blood vessel and do not need to be supported by the stent. At this time, if the radial force at both ends of the stent is large, it will over-support the normal blood vessel and damage the healthy blood vessel. Therefore, the size of the end mesh 1a at both ends of the support skeleton part 1 is processed to be larger than the size of the middle mesh 1b between the two ends, so that the radial support force at both ends of the stent is smaller than the radial support force in the middle, thereby avoiding damage to the healthy blood vessel.

[0041] In this embodiment, the mesh size 1a of the ends of the support frame part 1 is 150mm. 2 -200mm 2 , the size of the middle mesh 1b between the two ends is 90mm 2 -140mm 2 The mesh area of ​​the stopper mesh part 2 is 0.3mm 2 -0.5mm 2 .

[0042] In summary, the support skeleton part 1 of the cut braided stent provided by the present invention can provide moderate radial support force and effectively support stenotic lesions, while the stop mesh part 2 can better stop plaques and prevent them from falling off, effectively reducing the probability of plaques falling off from the stent mesh and preventing microembolism after plaque falling off. The overall integrity is stronger, effectively reducing the risk of stent delamination.

[0043] It should be understood that the above description is merely exemplary and the embodiments of the present application do not limit this.

[0044] The above are only preferred 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 are within the scope of protection of the pending claims of the present invention.

Claims

1. A cut-and-weave stent, comprising a support frame portion (1) obtained by cutting and a stopper mesh portion (2) obtained by weaving, characterized in that: The support frame part (1) comprises a plurality of cross bars (101) arranged at intervals along the circumferential direction and extending along the axial direction, a vertical bar (102) arranged at intervals along the axial direction is arranged between any two adjacent cross bars (101), the vertical bar (102) is used to connect any two adjacent cross bars (101), and the plurality of cross bars (101) and the plurality of vertical bars (102) are arranged vertically and horizontally to form the support frame part (1) arranged in an integrated manner; The stop net portion (2) comprises transverse braided wires (201) extending in the axial direction and vertical braided wires (202) extending in the circumferential direction, wherein the transverse braided wires (201) are staggered around the vertical rods (102), and the vertical braided wires (202) are staggered around the cross rods (101), so that the support frame portion (1) and the stop net portion (2) are braided and fixedly connected in an integral manner.

2. The cutting braided stent according to claim 1, characterized in that: The cross bars (101) are arranged to extend in a wave shape, and the wave crests and wave troughs of any two adjacent cross bars (101) are opposite to each other.

3. The cutting braided stent according to claim 2, characterized in that: One end of each vertical rod (102) is connected to a wave crest on one of the horizontal rods (101), and the other end is connected to a wave trough on another horizontal rod (101).

4. The cutting braided stent according to claim 3, characterized in that: The vertical rod (102) is in a nearly straight line shape and forms a set angle with the vertical radial direction.

5. The cutting braided stent according to any one of claims 1 to 4, characterized in that: The transverse braided wires (201) and the vertical braided wires (202) are both made of a developing material, so that the cut braided stent can be developed as a whole.

6. The cutting braided stent according to claim 5, characterized in that: The support frame part (1) is made of nickel-titanium alloy tube or stainless steel tube through laser cutting, and the transverse braided wire (201) and the vertical braided wire (202) are both double-layer structures, and the double-layer structure has an outer nickel-titanium layer and an inner platinum core.

7. The cutting braided stent according to claim 6, characterized in that: The transverse braiding wires (201) and the vertical braiding wires (202) have the same wire diameter, both of which are 0.02 mm-0.03 mm.

8. The cutting braided stent according to any one of claims 1 to 4, characterized in that: The size of the end meshes (1a) at both ends of the support frame part (1) is larger than the size of the middle meshes (1b) between the two ends.

9. The cutting braided stent according to any one of claims 1 to 4, characterized in that: The mesh size (1a) at both ends of the support frame part (1) is 150 mm. 2 -200mm 2 The size of the middle mesh (1b) between the two ends is 90mm 2 -140mm 2 The mesh area of ​​the stopper net part (2) is 0.3 mm 2 -0.5mm 2 .

10. The cutting braided stent according to any one of claims 1 to 4, characterized in that: The cut braided stent has a length of 15 mm to 22 mm and a diameter of 2.5 mm to 4.5 mm.

Images