CN113017753A - Blood vessel support - Google Patents

Abstract

The present invention provides a vascular stent comprising: the supporting framework is arranged in a tubular shape and comprises a first supporting section, a spiral section and a second supporting section which are sequentially connected in the axial direction, and the spiral section is formed by spirally extending a plurality of spiral ribs side by side in the axial direction of the supporting framework; the inner weaving layer is arranged in a tubular shape and covers the inner circumferential wall of the spiral section, and the inner weaving layer is formed by spirally extending and cross weaving a plurality of weaving wires in the axial direction of the supporting framework. The spiral section of the supporting framework of the blood vessel support can be self-adaptive and telescopic along the axial direction, so that the spiral section drives the inner weaving layer to keep following under a good adherent state when the blood vessel moves, the inner weaving layer is ensured to accurately cover the neck of the aneurysm, the blood flow entering the aneurysm is slowed down, and the problems that the blood flow of a collateral blood vessel or a perforator blood vessel covered by the existing support is obviously reduced, the blood vessels are damaged at two ends of the support, the operation is complex and the like are solved.

Description

Blood vessel support

Technical Field

The invention relates to the technical field of medical instruments, in particular to a vascular stent which can be implanted into an intracranial arterial vessel for treating diseases such as intracranial aneurysm.

Background

Intracranial aneurysm is an abnormal bulge formed by gradual expansion of an intracranial arterial vessel under the action of hemodynamic load and other factors, wherein local vessel wall damage is caused by congenital abnormality or acquired injury and other factors. The intracranial aneurysm rupture bleeding has acute morbidity, serious symptoms, no obvious aura, and high mortality and disability rate.

The treatment of intracranial aneurysm is mainly by external surgical clipping and endovascular interventional embolization, but the surgical clipping has large wound, many complications and long operation and recovery time, and is not popular with doctors and patients. With the development and progress of minimally invasive endovascular interventional therapy technology, more and more intracranial aneurysm patients receive endovascular interventional therapy technology, and endovascular interventional embolization technology gradually becomes the leading technology of intracranial aneurysm treatment.

In the actual treatment process of intracranial complex aneurysms such as wide-neck aneurysms, fusiform aneurysms, large or huge aneurysms and dissected aneurysms, a plurality of spring rings are needed to complete embolization, and an additional auxiliary device (a balloon or a stent) is needed to support the aneurysms, so that on one hand, the difficulty of the operation is increased, the operation time is prolonged, and on the other hand, the cost of the whole operation process is very high. Therefore, in order to solve the problems in the treatment of complicated aneurysms, blood flow guiding devices have been designed and developed.

The blood flow guiding device is a self-expanding bracket with low porosity, can reduce the blood exchange between an aneurysm body and a parent artery, induce the formation of thrombus in the aneurysm, and promote the intimal hyperplasia at the neck of the aneurysm, thereby achieving the reconstruction effect of the parent artery.

However, the current blood flow guiding devices for treating intracranial aneurysms still have the following problems:

when the existing blood flow guiding device is used for treating aneurysm, the stent is inevitable to cover a side branch blood vessel or a branch-crossing blood vessel, and the whole metal coverage rate of the stent is high, so that the blood flow of the side branch blood vessel or the branch-crossing blood vessel is obviously reduced, the risk of blood vessel occlusion is generated, and serious complications are brought to a patient;

secondly, a stent of the existing blood flow guiding device is formed by weaving a plurality of strands of filaments, and both ends of the stent are provided with scattered weaving filament heads, so that the inner wall of a blood vessel is easily damaged in the pushing and releasing processes;

and (III) the existing blood flow guiding device which is purely woven is relatively complex to operate in the operation and has higher operation requirement on operators.

Disclosure of Invention

The invention mainly aims to provide a blood vessel stent, which solves the problems that the blood flow of a collateral blood vessel or a perforator blood vessel covered by the existing stent is obviously reduced, the two ends of the stent damage the blood vessel, the operation is complex and the like.

In order to achieve the primary object of the present invention, there is provided a stent for blood vessels, comprising: the supporting framework is arranged in a tubular shape and comprises a first supporting section, a spiral section and a second supporting section which are sequentially connected in the axial direction, and the spiral section is formed by spirally extending a plurality of spiral ribs side by side in the axial direction of the supporting framework; the inner weaving layer is arranged in a tubular shape and covers the inner circumferential wall of the spiral section, and the inner weaving layer is formed by spirally extending and cross weaving a plurality of weaving wires in the axial direction of the supporting framework.

According to the scheme, the spiral section is arranged in the middle of the supporting framework of the intravascular stent and is formed by spirally extending a plurality of spiral ribs side by side in the axial direction of the supporting framework, the self-expansion inner braided layer arranged on the inner peripheral wall of the spiral section has strong radial supporting performance in a blood vessel, the flexibility of the spiral section is good, an expansion space is provided for the self-expansion inner braided layer, and the self-expansion capacity of the intravascular stent is improved. Simultaneously, under the stable circumstances of the first support section in both ends of the support skeleton of blood vessel support and second support section anchor, the spiral section at support skeleton middle part can be followed the axial and is stretched out and drawn back from the adaptation for the spiral section drives the interior weaving layer and can keep following up under the good state of adherence when vascular motion, ensures that the interior weaving layer accurately covers the aneurysm neck, thereby slows down in the blood flow gets into the aneurysm. Moreover, the intravascular stent is convenient to push in the blood vessel and simple to operate in the operation. The blood vessel stent is implanted into an intracranial artery blood vessel for treating diseases such as intracranial aneurysm and the like, and solves the problems that the blood flow of a collateral blood vessel or a transbronchial blood vessel covered by the existing stent is obviously reduced, the two ends of the stent damage the blood vessel, the operation is complex and the like.

Preferably, each strand of braided wire includes an inner core and an outer ring covering the outer peripheral wall of the inner core, the inner core being made of a first material that is visible to X-rays, and the outer ring being made of a second material.

Still further, the cross-sectional area of the inner core is between 10% and 50% of the cross-sectional area of the braided wire.

Further, the pitches of the spiral ribs are equal.

The further proposal is that a plurality of spiral ribs are arranged side by side in the axial direction of the supporting framework at equal intervals.

In a further aspect, the pitch of the helical rib is equal to the pitch of the braided wire.

In a further development, the width of the spiral rib in the circumferential direction of the support frame is greater than the diameter of the braided wire.

The other end of the first supporting section, which is far away from the spiral section, is provided with a plurality of first developing sleeves; and/or one end of the second supporting section, which is far away from the spiral section, is provided with a plurality of second developing sleeves.

The first end of the inner weaving layer is connected with the first ends of the spiral ribs through a spring ring; and/or the second end of the inner braided layer is connected to the second end of the spiral rib through a spring ring.

The first end of the inner braid is clamped on the first end of the spiral rib through a C-shaped ring; and/or the second end of the inner braid is clamped on the second end of the spiral rib through the C-shaped ring.

Drawings

Fig. 1 is a structural view of a first embodiment of the stent of the present invention.

Fig. 2 is a front view of a first embodiment of the inventive stent.

Fig. 3 is a schematic view of the first embodiment of the stent of the present invention in which the inner braid is virtually laid out in an expanded state.

Fig. 4 is an axial cross-sectional view of a braided wire in a first embodiment of a stent of the present invention.

Fig. 5 is a radial cross-sectional view of a braided wire in a first embodiment of a stent of the present invention.

Fig. 6 is a structural view of a support frame in a first embodiment of the stent of the present invention.

Fig. 7 is a schematic view of the first embodiment of the stent of the present invention in an imaginary laid-open state.

Fig. 8 is a partial view of the connection of the inner braid and the helical ribs of the first embodiment of the stent of the present invention.

Fig. 9 is a schematic view showing a connection mode of the inner braid and the spiral rib in the first embodiment of the stent for blood vessels of the present invention.

Fig. 10 is a partial view of another manner of connecting the inner braid and the helical ribs in the first embodiment of the stent for blood vessels according to the present invention.

Fig. 11 is a schematic view showing another connection manner of the inner braid and the spiral rib in the first embodiment of the stent for blood vessels of the present invention.

Fig. 12 is a structural view of a second embodiment of the stent of the present invention.

Fig. 13 is a structural view of a support frame in a second embodiment of the stent of the present invention.

Fig. 14 is a schematic view of a second embodiment of the stent of the present invention with the support frame in an imaginary laid-open state.

The invention is further explained with reference to the drawings and the embodiments.

Detailed Description

First embodiment of the vascular stent:

referring to fig. 1 and 2, the present embodiment discloses a vascular stent 1, in particular, a vascular stent 1 implantable in an intracranial arterial vessel for treating diseases such as intracranial aneurysm. The blood vessel stent 1 comprises a supportingframework 11 and aninner braid 12, wherein the supportingframework 11 is a tubular structure formed by laser engraving of a metal tube and has low metal coverage rate. Wherein,support skeleton 11 is including thefirst support section 112,spiral section 111 and thesecond support section 113 that connect gradually in its axial, andspiral section 111 is extended by manyspiral muscle 1111 side by side spiral in the axial ofsupport skeleton 11 and is formed. Theinner braid 12 is disposed in a tubular shape and covers the inner circumferential wall of thespiral section 111 of thesupport frame 11, and theinner braid 12 is formed by spirally extending and cross-braiding a plurality ofbraided wires 121 in the axial direction of thesupport frame 11, and has a high metal coverage.

The middle part of thesupport framework 11 of the blood vessel support 1 of the embodiment is provided with thespiral section 111, thespiral section 111 is formed by a plurality ofspiral ribs 1111 which extend spirally side by side in the axial direction of thesupport framework 11, the self-expansioninner woven layer 12 arranged on the inner circumferential wall of thespiral section 111 has stronger radial support performance in the blood vessel, the flexibility of thespiral section 111 is good, the self-expansioninner woven layer 12 provides an expansion space, and the self-expansion capability of the blood vessel support 1 is improved. Meanwhile, under the condition that the anchoring of the first supportingsection 112 and the second supportingsection 113 at the two ends of the supportingframework 11 of the blood vessel support 1 is stable, thespiral section 111 in the middle of the supportingframework 11 can be axially self-adaptive and telescopic, so that thespiral section 111 drives theinner weaving layer 12 to keep following under a good adherence state when the blood vessel moves.

When vascular stent 1 implants the parent artery,spiral section 111 just covers in the position of tumour neck mouth, because be equipped withinterior weaving layer 12 inspiral section 111,interior weaving layer 12 has higher metal coverage, can effectively change the hemodynamics in the aneurysm, slows down the blood flow and gets into the aneurysm, reaches the purpose of curing the aneurysm. In a parent artery, thefirst support section 112 and thesecond support section 113 of the blood vessel stent 1 are respectively positioned at two ends of the neck of the parent artery, so that the stent is firmly anchored in the blood vessel, and because thefirst support section 112 and thesecond support section 113 have lower metal coverage, the blood flow of a collateral branch and a blood vessel through the collateral branch near the neck of the parent artery is not influenced, and the problems of obvious reduction of blood flow, blood vessel occlusion and the like caused by the fact that the existing blood vessel stent covers the collateral branch or the blood vessel through the collateral branch are solved.

Moreover, the intravascular stent 1 of the embodiment is convenient to push in the blood vessel and simple to operate in the operation. The blood vessel stent 1 of the embodiment is implanted into an intracranial artery vessel for treating diseases such as intracranial aneurysm and the like, and solves the problems that the blood flow of a collateral vessel or a transbronchial vessel covered by the existing stent is obviously reduced, the two ends of the stent damage the blood vessel, the operation is complex and the like.

Referring to fig. 3 to 5, theinner braid 12 of the blood vessel stent 1 of the present embodiment is formed by spirally extending 24 to 144 strands ofbraid wires 121 in the axial direction of the supportingframe 11 and cross-braiding, the braided PPI (pixel density) is 50 to 300, and the metal coverage of theinner braid 12 is between 15% and 45%. Eachstrand 121 of theinner braid 12 includes aninner core 1212 and anouter ring 1211 wrapped around an outer peripheral wall of theinner core 1212, theinner core 1212 being made of a first material that is X-ray visible and theouter ring 1211 being made of a second material. In this embodiment, the diameter of each strand of thebraided wire 121 of the inner braidedlayer 12 is 0.02mm to 0.06mm, and the cross-sectional area of theinner core 1212 of the braidedwire 121 is 10% to 50% of the cross-sectional area of the braidedwire 121. The first material can be one of platinum, gold, platinum-iridium alloy, pure tantalum and the like which can be seen in X-ray, and the second material can be one of cobalt-chromium alloy, nickel-titanium alloy, stainless steel and the like. Theinner core 1212 of theinner braid 12 of the blood vessel stent 1 of the present embodiment is made of the first material visible by X-ray, so that the blood vessel stent 1 can be precisely placed under X-ray, and theinner braid 12 is ensured to accurately cover the neck of the aneurysm, thereby slowing down the blood flow entering the aneurysm.

Referring to fig. 6 and 7, in the stent 1 of the present embodiment, the plurality ofspiral ribs 1111 of thespiral section 111 in thesupport frame 11 have the same pitch, the plurality ofspiral ribs 1111 are arranged side by side at equal intervals in the axial direction of thesupport frame 11, the pitch of thespiral ribs 1111 is equal to the pitch of thebraided wire 121, and the width L3 of thespiral ribs 1111 in the circumferential direction of thesupport frame 11 is greater than the diameter of the braidedwire 121. First ends of thespiral ribs 1111 are connected with thefirst support section 112 to form a plurality of first connection points 1124, and thefirst connection points 1124 are uniformly distributed in the circumferential direction of thesupport framework 11; and/or the second ends of thespiral ribs 1111 are connected with thesecond support section 113 to form a plurality of second connection points 1135, and the plurality of second connection points 1135 are uniformly distributed in the circumferential direction of thesupport framework 11.

Thefirst support segment 112 of this embodiment is formed by arranging a plurality of first support rings 1121 and a plurality of firstcompliant rings 1122 in an staggered manner in the axial direction of thesupport frame 11, eachfirst support ring 1121 and each firstcompliant ring 1122 extend in a sinusoidal curve in the circumferential direction of thesupport frame 11, a plurality of firstclosed lattices 1123 are formed by connecting adjacent first support rings 1121 and firstcompliant rings 1122, the number of sinusoidal units of the firstcompliant rings 1122 in each firstclosed lattice 1123 is greater than the number of sinusoidal units of the first support rings 1121, and the first ends of the plurality ofspiral ribs 1111 are connected to adjacent first support rings 1121 respectively. The width L1 of the first support rib of thefirst support ring 1121 in the circumferential direction of thesupport frame 11 is greater than the width L2 of the first compliant rib of the firstcompliant ring 1122 in the circumferential direction of thesupport frame 11.

Thesecond support segment 113 of this embodiment is formed by a plurality of second support rings 1131 and a plurality of secondcompliant rings 1132 being arranged side by side in an staggered manner in the axial direction of thesupport frame 11, eachsecond support ring 1131 and each secondcompliant ring 1132 extending in a sinusoidal curve in the circumferential direction of thesupport frame 11, a plurality of secondclosed lattices 1134 are formed by connecting between adjacent second support rings 1131 and secondcompliant rings 1132, the number of sinusoidal units of the secondcompliant rings 1132 in each secondclosed lattice 1134 is greater than the number of sinusoidal units of the second support rings 1131, and the second ends of the plurality ofspiral ribs 1111 are connected with adjacent second support rings 1131. Wherein, the width L4 of the second support rib of thesecond support ring 1131 in the circumferential direction of thesupport skeleton 11 is greater than the width L5 of the second compliant rib of the secondcompliant ring 1132 in the circumferential direction of thesupport skeleton 11. In addition, in this embodiment, thesecond support segment 113 further includes a thirdcompliant ring 1133, the thirdcompliant ring 1133 extends in a sinusoidal manner in the circumferential direction of thesupport skeleton 11, and the thirdcompliant ring 1133 is connected to the secondcompliant ring 1132 away from thespiral segment 111, and the string openings of the thirdcompliant ring 1133 and the string openings of the secondcompliant ring 1132 form a rhombicclosed lattice 1136 in one-to-one correspondence.

Specifically, thespiral section 111 of thesupport frame 11 of the present embodiment is formed by sixspiral ribs 1111 that extend spirally side by side in the axial direction of thesupport frame 11, the thread pitches of the sixspiral ribs 1111 are equal, and the sixspiral ribs 1111 are arranged side by side at equal intervals in the axial direction of thesupport frame 11. One end of thefirst support section 112, which is far away from thespiral section 111, is provided with a first flared opening, thefirst support section 112 in this embodiment is formed by two first support rings 1121 and two firstcompliant rings 1122 that are arranged side by side in an staggered manner in the axial direction of thesupport frame 11, three firstclosed lattices 1123 are formed by connecting the adjacent first support rings 1121 and the firstcompliant rings 1122, the three firstclosed lattices 1123 are uniformly arranged in the circumferential direction of thesupport frame 11, and each firstclosed lattice 1123 is internally provided with three sinusoidal units of the firstcompliant rings 1122 and sinusoidal units of the two first support rings 1121. In the axial direction of thesupport frame 11, two adjacent firstclosed lattices 1123 are arranged in a staggered manner. The first end of thefirst support section 112, which is far away from thespiral section 111, is a firstcompliant ring 1122, one end of the firstcompliant ring 1122, which is far away from thespiral section 111, is provided with three first developingsleeves 2, and the three first developingsleeves 2 are uniformly arranged in the circumferential direction of thesupport framework 11. The second end of the first supportingsection 112 adjacent to thespiral section 111 is a first supportingring 1121, the first ends of the sixspiral ribs 1111 are respectively connected with the six peaks on the adjacent side of the first supportingring 1121 in a one-to-one correspondence manner to form six first connection points 1124, and the sixfirst connection points 1124 are uniformly distributed in the circumferential direction of the supportingframework 11.

One end of thesecond support section 113, which is away from thespiral section 111, has a second flared mouth, in this embodiment, thesecond support section 113 is formed by two second support rings 1131 and two secondcompliant rings 1132, which are arranged side by side in an staggered manner in the axial direction of thesupport skeleton 11, and one thirdcompliant ring 1133 connected to the secondcompliant ring 1132, which is away from thespiral section 111, three secondclosed cells 1134 are formed by connecting the adjacent second support rings 1131 and the secondcompliant rings 1132, the three secondclosed cells 1134 are uniformly arranged in the circumferential direction of thesupport skeleton 11, and each secondclosed cell 1134 has a sinusoidal unit of the three secondcompliant rings 1132 and a sinusoidal unit of the two second support rings 1131. In the axial direction of thesupport frame 11, two adjacent secondclosed cells 1134 are arranged in a staggered manner. The thirdcompliant ring 1133 is connected to the secondcompliant ring 1132 which is far away from thespiral section 111, the string openings of the thirdcompliant ring 1133 and the string openings of the secondcompliant ring 1132 form nine rhombicclosed cells 1136 in a one-to-one correspondence manner, and the nine rhombicclosed cells 1136 are uniformly arranged in the circumferential direction of thesupport skeleton 11. One end of the thirdcompliant ring 1133, which is far away from thespiral section 111, is provided with three second developingsleeves 3, and the three second developingsleeves 3 are uniformly arranged in the circumferential direction of the supportingframework 11. One end of thesecond support section 113 adjacent to thespiral section 111 is asecond support ring 1131, the second ends of the sixspiral ribs 1111 are respectively connected with the six peaks on the adjacent side of thesecond support ring 1131 in a one-to-one correspondence manner to form six second connection points 1135, and the six second connection points 1135 are uniformly distributed in the circumferential direction of thesupport frame 11.

Thefirst support section 112 of thesupport framework 11 in the vessel stent 1 of the present embodiment is formed by arranging a plurality of first support rings 1121 and a plurality of firstcompliant rings 1122 alternately side by side in the axial direction of thesupport framework 11, and thesecond support section 113 of thesupport framework 11 is formed by arranging a plurality of second support rings 1131 and a plurality of secondcompliant rings 1132 alternately side by side in the axial direction of thesupport framework 11 and a thirdcompliant ring 1133 connected to the secondcompliant ring 1132 distant from thespiral section 111. In the release process of the vessel stent 1, thefirst support section 112 is pushed out of the catheter first, and the firstcompliant rings 1122 and the first support rings 1121 of thefirst support section 112 are opened in sequence, so that thefirst support section 112 can be ensured to bend and adhere to the vessel sufficiently due to the staggered and segmented design of the plurality of firstcompliant rings 1122 and the plurality of first support rings 1121. Becausespiral section 111 has suitable support nature and compliance,interior weaving layer 12 endotheca is inspiral section 111, can guarantee thatinterior weaving layer 12 opens smoothly. Similarly, in thesecond support section 113, the staggered and segmented design of the secondcompliant ring 1132 and thesecond support ring 1131 can ensure that thesecond support section 113 adheres to the wall sufficiently at the curved blood vessel, and meanwhile, the chord openings of the thirdcompliant ring 1133 and the chord openings of the secondcompliant ring 1132 form rhombicclosed lattices 1136 in one-to-one correspondence, so that sufficient support can be improved in the conduit, and the smooth pushing of the stent is ensured. Therefore, since the vessel stent 1 has thecut supporting skeleton 11, it has better operability than the existing pure braided stent, and does not need to release the stent slowly by the push-pull technology like the existing stent, thereby greatly simplifying the operation of releasing the stent in the operation and reducing the complication of the operation in the operation.

Referring to fig. 8 and 9, in this embodiment, theinner braid 12 is connected to thespiral rib 1111 in such a manner that a first end of theinner braid 12 is connected to a first end of thespiral rib 1111 by aspring coil 13; and/or the second end of theinner braid 12 is attached to the second end of thespiral rib 1111 by acoil spring 13. The quantity of thisembodiment spiral muscle 1111 is six, correspondingly, and the first end ofinterior weaving layer 12 is connected respectively on the first end of sixspiral muscle 1111 through six spring coils 13, and the second end ofinterior weaving layer 12 is connected respectively on the second of sixspiral muscle 1111 through sixspring coils 13 and is served.

Referring to fig. 10 and 11, in another connection manner of theinner braid 12 and thespiral rib 1111, a first end of theinner braid 12 is clamped on a first end of thespiral rib 1111 through a C-shapedring 14; and/or the second end of theinner braid 12 may be snapped onto the second end of thespiral rib 1111 by a C-ring 14. The quantity of thisembodiment spiral muscle 1111 is six, correspondingly, and the first end ofinterior weaving layer 12 is held at the first end of sixspiral muscle 1111 through six C type rings 14 block respectively, and the second end ofinterior weaving layer 12 is held at the second of sixspiral muscle 1111 through six C type rings 14 block respectively.

Therefore, theinner braid 12 of the blood vessel stent 1 is not only kept consistent with the contraction and expansion of thespiral section 111 of the supportingframework 11, but also the thread heads at the two ends of thebraided thread 121 of theinner braid 12 are fixed on the inner peripheral wall of thespiral rib 1111 of thespiral section 111, so that the contact between the thread head of thebraided thread 121 and the blood vessel wall is avoided, the stimulation to the blood vessel wall in the pushing and releasing process is reduced, and the problem that the inner wall of the blood vessel is damaged by the existing stent is effectively solved.

The supportingframework 11 of the blood vessel support 1 of the embodiment can be used independently, namely the supportingframework 11 can be implanted into a blood vessel independently for treating diseases such as blood vessel stenosis, the supportingframework 11 meets the requirement of the supporting property and has good flexibility, the problem that the radial supporting force of the existing blood vessel support is too large, so that a narrow plaque is easily extruded, plaque fragments block a branch blood vessel to cause infarction can be solved, and the problems that the compliance of the existing blood vessel support is poor, the chronic external expansion tension is small, and the adherence is poor and the restenosis is easily caused can be solved.

Second embodiment of vascular stent:

as an explanation of the second embodiment of the stent of the present invention, only the differences from the first embodiment of the stent will be explained below.

Referring to fig. 12 to 14, in the support framework 11 ' of the blood vessel stent 1 ' of the present embodiment, the first support section 112 ' is formed by connecting a plurality of first diamond-shaped mesh rings 4 in the axial direction of the support framework 11 ', and one end of the first support section 112 ' away from thespiral section 111 has a first flaring mouth; and/or the second support section 113 ' in the support framework 11 ' of the blood vessel support 1 ' is formed by connecting a plurality of second diamond-shaped mesh rings 5 in the axial direction of the support framework 11 ', and one end of the second support section 113 ' far away from thespiral section 111 is provided with a second flaring mouth. Wherein, one end of the first supporting section 112' far away from thespiral section 111 is provided with a plurality of first developingsleeves 2; and/or, one end of the second supporting section 113' far from thespiral section 111 is provided with a plurality of second developingsleeves 3.

Specifically, thespiral section 111 of the support frame 11 ' of the present embodiment is formed by sixspiral ribs 1111 that extend spirally side by side in the axial direction of the support frame 11 ', the thread pitches of the sixspiral ribs 1111 are equal, and the sixspiral ribs 1111 are arranged side by side at equal intervals in the axial direction of the support frame 11 '. The first supporting section 112 'is formed by connecting two first diamond-shaped grid rings 4 in the axial direction of the supporting framework 11', one end of the first supporting section 112 'far away from thespiral section 111 is provided with three first developingsleeves 2, and the three first developingsleeves 2 are uniformly arranged in the circumferential direction of the supporting framework 11'. The first ends of the sixspiral ribs 1111 are respectively connected with the six water chestnuts on the adjacent side of the first support section 112 'in a one-to-one correspondence manner to form six first connection points 1124', and the six first connection points 1124 'are uniformly distributed in the circumferential direction of the support framework 11'. The second supporting section 113 'is formed by connecting two second diamond-shaped grid rings 5 in the axial direction of the supporting framework 11', one end of the second supporting section 113 'far away from thespiral section 111 is provided with three second developingsleeves 3, and the three second developingsleeves 3 are uniformly arranged in the circumferential direction of the supporting framework 11'. The second ends of the sixspiral ribs 1111 are respectively connected with the six water caltrops on the adjacent side of the second support section 113 'in a one-to-one correspondence manner to form six second connection points 1135', and the six second connection points 1135 'are uniformly distributed in the circumferential direction of the support framework 11'.

The first support section 112 'of the support framework 11' in the vessel stent 1 'of the present embodiment is formed by connecting a plurality of first diamond-shaped mesh rings 4 in the axial direction of the support framework 11', and the second support section 113 'of the support framework 11' is formed by connecting a plurality of second diamond-shaped mesh rings 5 in the axial direction of the support framework 11 ', so as to provide good radial support force and good adherence, and enable the vessel stent 1' to obtain more moderate radial support force and better anchoring force. Simultaneously, the support skeleton 11 ' middle part of blood vessel support 1 ' hasspiral section 111, andspiral section 111 is extended bymany spiral muscle 1111 spirals side by side in the axial of support skeleton 11 ', has stronger radial support performance in the blood vessel to the self-expanding inner braid that sets up atspiral section 111 internal perisporium, andspiral section 111's pliability is good, provides expansion space for self-expanding inner braid, improves blood vessel support 1's self-expanding ability. Moreover, under the condition that the anchoring of the first supporting section 112 ' and the second supporting section 113 ' at the two ends of the supporting framework 11 ' of the blood vessel stent 1 ' is stable, thespiral section 111 at the middle part of the supporting framework 11 ' can be self-adaptive and telescopic along the axial direction, so that thespiral section 111 drives the inner braided layer to keep following under a good adherence state when the blood vessel moves. In addition, the intravascular stent 1' of the embodiment is convenient to push in the blood vessel and simple to operate in the operation. The blood vessel stent 1' of the embodiment is implanted into an intracranial artery vessel for treating diseases such as intracranial aneurysm and the like, and solves the problems that the blood flow of a collateral vessel or a transbronchial vessel covered by the existing stent is obviously reduced, the two ends of the stent damage the blood vessel, the operation is complex and the like.

The supporting framework 11 'of the blood vessel support 1' of the embodiment can be used independently, namely the supporting framework 11 'can be implanted into a blood vessel independently for treating diseases such as blood vessel stenosis, the supporting framework 11' meets the supporting requirement and has good flexibility, the problem that plaque fragments block a branch blood vessel to cause infarction due to too large radial supporting force of the existing blood vessel support and the problem that poor adherence and restenosis are easily caused due to poor compliance and small chronic external expansion tension of the existing blood vessel support can be solved.

The above embodiments are merely preferred examples of the present invention, and not intended to limit the scope of the invention, so that equivalent changes or modifications made based on the structure, characteristics and principles of the invention as claimed should be included in the claims of the present invention.

Claims (10)

1. A vascular stent, comprising:

the supporting framework is arranged in a tubular shape and comprises a first supporting section, a spiral section and a second supporting section which are sequentially connected in the axial direction, and the spiral section is formed by spirally extending a plurality of spiral ribs side by side in the axial direction of the supporting framework;

the inner weaving layer is arranged in a tubular shape and covers the inner circumferential wall of the spiral section, and the inner weaving layer is formed by spirally extending and cross-weaving a plurality of strands of weaving wires in the axial direction of the supporting framework.

2. The vascular stent of claim 1, wherein:

each strand of braided wire comprises an inner core and an outer ring coated on the outer peripheral wall of the inner core, the inner core is made of a first material visible in X-rays, and the outer ring is made of a second material.

3. The vascular stent of claim 2, wherein:

the cross-sectional area of the inner core is between 10% and 50% of the cross-sectional area of the braided wire.

4. The vascular stent of claim 1, wherein:

the screw pitches of the plurality of spiral ribs are equal.

5. The vascular stent of claim 4, wherein:

the spiral ribs are arranged in parallel in the axial direction of the supporting framework at equal intervals.

6. The vascular stent of claim 4, wherein:

the thread pitch of the spiral rib is equal to that of the weaving wire.

7. The vascular stent of claim 1, wherein:

the width of the spiral rib in the circumferential direction of the supporting framework is larger than the diameter of the weaving wire.

8. The vascular stent of claim 1, wherein:

a plurality of first developing sleeves are arranged at one end, far away from the spiral section, of the first supporting section; and/or one end of the second support section, which is far away from the spiral section, is provided with a plurality of second developing sleeves.

9. The vascular stent of any one of claims 1 to 8, wherein:

the first end of the inner woven layer is connected to the first end of the spiral rib through a spring ring; and/or the second end of the inner braided layer is connected to the second end of the spiral rib through a spring ring.

10. The vascular stent of any one of claims 1 to 8, wherein:

the first end of the inner weaving layer is clamped on the first end of the spiral rib through a C-shaped ring; and/or the second end of the inner braided layer is clamped on the second end of the spiral rib through a C-shaped ring.

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