Cutting braiding type supportTechnical Field
The invention belongs to the technical field of medical appliances for treating vascular diseases, and particularly relates to a cutting braided type bracket.
Background
Intracranial atherosclerotic stenosis is one of the main causes of ischemic stroke, and its pathophysiological processes are that cholesterol is deposited on the arterial wall, which causes thickening of the intima of the arterial vessel, foam cells infiltrate the intima, and then pathological intima thickening occurs, so that an atherosclerotic plaque with core necrosis is finally formed, and the atherosclerotic plaque can reduce the lumen size of the vessel, namely cause the stenosis of the vessel.
The stent implantation is a commonly used intravascular interventional treatment mode of intracranial atherosclerosis stenosis, a stent with larger mesh size is clinically used for treating lesions, the stent plays a supporting role on the inner cavity of the blood vessel after being released, and meanwhile, atherosclerotic plaques are extruded, the plaques are easy to rupture and fall off, and the fallen plaques pass through the mesh of the stent to enter the lumen of the blood vessel, so that the thromboembolism of a blood vessel at the far end of the lesion is caused.
The existing intracranial stent is manufactured by adopting a laser cutting technology, meshes of the cut stent are relatively large, if the sizes of the meshes of the cut stent are reduced, the radial supporting force of the cut stent can be obviously increased, and the damage to the intima of a blood vessel is likely to be caused. The mesh size of the single braided stent is smaller, so that the falling plaque can be effectively prevented from entering the vascular lumen through the mesh of the stent, but the radial supporting force is insufficient, and restenosis in the stent easily occurs in the later stage.
In order to solve the above problems, a double-layer stent is generally used, the double-layer stent has a layer of supporting frame with larger meshes and a layer of stop frame sleeved outside or in the supporting frame with smaller meshes, the supporting frame is used for improving the overall radial supporting force of the stent, and the stop frame is used for further stopping the falling plaque, but the double-layer stent has an obvious disadvantage that the first layer and the second layer are sleeved structures, so that the risk of layering is higher, the poor adhesion between the stent and the vessel wall is caused, and the occurrence rate of thrombosis or restenosis in the stent is increased.
Accordingly, there is a need to provide an improved solution to the above-mentioned deficiencies of the prior art.
Disclosure of Invention
The invention aims to provide a cutting woven type bracket, which mainly solves the technical problem that the existing double-layer bracket has higher layering risk.
In order to achieve the above object, the cutting woven stent of the present invention provides the following technical solutions:
The cutting and weaving type support comprises a support framework part obtained by cutting and a stop net part obtained by weaving, wherein the support framework part is provided with a plurality of cross bars which are arranged at intervals along the circumferential direction and extend along the axial direction, vertical rods which are arranged at intervals along the axial direction are arranged between any two adjacent cross bars, the vertical rods are used for connecting any two adjacent cross bars, and the plurality of cross bars and the plurality of vertical rods are vertically and horizontally arranged to form the support framework part which is integrally arranged;
The stop net part is provided with transverse braiding wires extending along the axial direction and vertical braiding wires extending along the circumferential direction, the transverse braiding wires are staggered and wound with vertical rods, and the vertical braiding wires are staggered and wound with transverse rods, so that the support framework part and the stop net part are integrally and fixedly connected in a braiding mode.
As a further optimized technical scheme, the cross bars are arranged in a wave-shaped extending mode, and the wave crests and wave troughs of any two adjacent cross bars are opposite.
As a further optimized technical scheme, one end of each vertical rod is connected with a wave crest on one transverse rod, and the other end of each vertical rod is connected with a wave trough on the other transverse rod.
As a further optimized technical scheme, the vertical rod is in a shape close to a straight line and forms a set included angle with the vertical radial direction.
As a further optimized technical scheme, the transverse braided wires and the vertical braided wires are made of developing materials, so that the whole cutting braided type support is developed.
As a further optimized technical scheme, the support framework part is formed by cutting a nickel-titanium alloy pipe or a stainless steel pipe by laser, and the transverse braiding wires and the vertical braiding wires are of a double-layer structure, and the double-layer structure is provided with a nickel-titanium layer on the outer side and a platinum core on the inner side.
As a further optimized technical scheme, the diameters of the transverse knitting yarns and the vertical knitting yarns are the same and are all 0.02mm-0.03mm.
As a further optimized technical solution, the end mesh size of the two ends of the supporting framework part is larger than the middle mesh size between the two ends.
As a further optimized technical scheme, the mesh sizes of the end parts at the two ends of the supporting framework part are 150mm2-200mm2, the mesh size of the middle part between the two ends is 90mm2-140mm2, and the mesh area of the stopping net part is 0.3mm2-0.5mm2.
As a further optimized technical scheme, the length of the cutting braided stent is 15mm-22mm, and the diameter is 2.5mm-4.5mm.
The support frame has the advantages that the support frame part can provide moderate radial supporting force to effectively support the stenotic lesion, the mesh size of the stop net part is smaller, the plaque can be better stopped and prevented from falling off, the probability of falling off of the plaque from the meshes of the support frame can be effectively reduced, micro embolism after falling off of the plaque is prevented, compared with the existing single cutting support frame, the support frame has smaller mesh area, larger coverage area of the plaque and capability of effectively reducing the probability of falling off of the plaque from the meshes of the support frame, and compared with the single weaving support frame, the support frame has moderate radial supporting force and can effectively support the stenotic lesion. Compared with a double-layer bracket, the cutting framework and the woven mesh of the bracket are overlapped and distributed, and the supporting framework part and the stop mesh part are integrally woven and fixedly connected, so that the integral integrity is stronger, and the layering risk of the bracket is effectively reduced.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. Wherein:
FIG. 1 is a schematic diagram of the overall structure of an embodiment of the present invention;
FIG. 2 is a schematic view of a portion of a support frame according to one embodiment of the present invention;
FIG. 3 is a schematic representation of the weave pattern of transversely woven filaments with a support frame portion according to one embodiment of the invention;
Fig. 4 is a schematic view showing a woven state of vertical woven wires and a support frame portion according to an embodiment of the present invention.
In the figure, 1 part of the supporting framework, 1a part of the end part mesh, 1b part of the middle part mesh, 101, cross bars, 102, vertical rods, 2 parts of the stopping net, 201 parts of the transverse knitting wires, 202 parts of the vertical knitting wires.
Detailed Description
The following description of the technical solutions in the embodiments of the present invention will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which are derived by a person skilled in the art based on the embodiments of the invention, fall within the scope of protection of the invention.
In the description of the present invention, the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", etc. refer to the orientation or positional relationship based on that shown in the drawings, merely for convenience of description of the present invention and do not require that the present invention must be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. The terms "coupled" and "connected" as used herein are to be construed broadly, and may be, for example, fixedly coupled or detachably coupled, or may be directly coupled or indirectly coupled through intermediate members, as will be apparent to those of ordinary skill in the art, in view of the detailed description of the terms.
The invention will be described in detail below with reference to the drawings in connection with embodiments. It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
The invention provides a cutting and weaving type support which is provided with a support framework part obtained by cutting and a stop net part obtained by weaving, wherein the stop net part weaves the support framework part into the stop net part in the weaving process, so that the support framework part and the stop net part are integrated by weaving, the integrity of the support is effectively improved, in addition, the support framework part has larger meshes and is mainly used for supporting blood vessels, and the stop net part has smaller meshes and can effectively block plaque on the blood vessel walls.
Example 1
As shown in fig. 1 and 2, the cut-and-braid type stent has a length of 15mm-22mm (for example, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm and a range value between any two ends according to different models) and a diameter of 2.5mm-4.5mm (for example, 2.5mm, 3.0mm, 3.5mm, 4.0mm, 4.5mm and a range value between any two ends according to different models), and has a supporting skeleton portion 1 and a stop net portion 2, and the supporting skeleton portion 1 and the stop net portion 2 are used for braiding into a whole, so that the stent can effectively support a blood vessel and can conveniently block plaque on the blood vessel.
Specifically, the supporting frame portion 1 is formed into a net structure by laser cutting using a nickel-titanium alloy tube or a stainless steel tube, the supporting frame portion 1 has a plurality of cross bars 101 arranged at uniform intervals in the circumferential direction and extending in the axial direction, 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 wave shape in the extending process, and peaks and valleys of any adjacent two cross bars 101 are opposite in the supporting frame expanding state.
The two adjacent cross bars 101 are provided with vertical bars 102 which are uniformly arranged at intervals along the axial direction, one end of each vertical bar 102 is integrally and fixedly connected with a wave crest on one cross bar 101, and the other end is integrally and fixedly connected with a wave trough on the other cross bar 101, so that the two adjacent cross bars 101 are connected, and the vertical bars 102 are in a nearly linear shape and form a set included angle with the vertical radial direction. The plurality of cross bars 101 and the plurality of vertical bars 102 are arranged in a longitudinal and transverse manner to form the integrally arranged support frame portion 1.
The stop net part 2 is provided with transverse knitting wires 201 extending along the axial direction and vertical knitting wires 202 extending along the circumferential direction, wherein the transverse knitting wires 201 are staggered and wound on the vertical rods 102, and it should be noted that the staggered and wound on the vertical rods 102 by the transverse knitting wires 201 means that any one transverse knitting wire 201 penetrates from one grid at one end of the supporting framework part 1, enters the other grid across the top of the vertical rods 102 and then penetrates out from the bottom of the vertical rods 102 of the other grid in the knitting process, and is circularly arranged to extend along the axial direction and penetrate to the other end of the supporting framework part 1.
In the same way, the cross bars 101 are wound around the vertical braiding wires 202 in a staggered manner, as shown in fig. 4, in the braiding process, any one vertical braiding wire 202 penetrates from one grid on one side of the supporting framework part 1, crosses the top of the cross bar 101 to enter the other grid, and then penetrates from the bottom of the cross bar 101 of the other grid, and the vertical braiding wires 202 are circularly arranged to extend circumferentially and penetrate through the supporting framework part 1 for one circle. Through the above-mentioned mode of weaving for support skeleton part 1 and backstop net part 2 weave as an organic wholely, with the better cutting woven type support of obtaining the wholeness, this support does not have support skeleton part 1 and backstop net part 2 separation's risk, and this support has good radial support nature, and it is smaller than the mesh size of independent cutting support simultaneously, can block the plaque on the blood vessel more effectively.
Further, in order to facilitate the operation, the transverse knitting yarn 201 and the vertical knitting yarn 202 are made of developing materials, so that the whole cut knitting type stent is developed, and thus, a doctor can conveniently observe the position and the state of the stent during the operation.
In this embodiment, the support frame portion 1 uses both the transverse braid wires 201 and the vertical braid wires 202 in a double layer structure having an outer nickel titanium layer and an inner platinum core. The inner platinum core has the characteristic of radiopacity, so that the stop net part 2 can be developed in full section, namely the cutting braided stent can be developed in a whole body in the operation process.
In this embodiment, the diameters of the transverse knitting yarn 201 and the vertical knitting yarn 202 are the same, and are all 0.02mm-0.03mm (for example, may be 0.02mm, 0.03mm and the interval value between any two ends according to different models).
Further, the end mesh 1a at both ends of the support frame portion 1 is larger in size than the middle mesh 1b between both ends. Because the support is in use, the length is usually selected to be slightly longer than the length of the lesion site so as to fully cover the narrow lesion site, and thus the middle site of the support is used for fully supporting the narrow site of the blood vessel, the support strength of the middle site of the support is required to be relatively higher, the two ends of the support are positioned at the healthy site of the blood vessel, and the support is not required, at this time, if the radial force of the two ends of the support is higher, the normal blood vessel is excessively supported, and the healthy blood vessel is damaged, therefore, the size of the end mesh 1a of the two ends of the support framework part 1 is processed to be greater than the size of the middle mesh 1b between the two ends, so that the radial supporting force of the two ends of the support is smaller than the radial supporting force of the middle part, and thus the healthy blood vessel is prevented from being damaged.
In this embodiment, the end mesh size 1a of both ends of the supporting frame portion 1 is 150mm2-200mm2, the middle mesh 1b between both ends is 90mm2-140mm2, and the mesh area of the stopper mesh portion 2 is 0.3mm2-0.5mm2.
In summary, the supporting framework part 1 of the cut braided stent provided by the invention can provide moderate radial supporting force to effectively support the stenotic lesion, the blocking net part 2 can better block the plaque and prevent the plaque from falling off, the probability of falling off the plaque from the meshes of the stent is effectively reduced, micro embolism after the plaque falls off is prevented, the integral integrity is stronger, and the layering risk of the stent is effectively reduced.
It is to be understood that the above description is intended to be illustrative, and that the embodiments of the present application are not limited thereto.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the particular embodiments disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.