A flexible vascular embolization recanalization device

Abstract

The present invention discloses a flexible vascular embolization recanalization device, including a main capture device, the main capture device including a plurality of main capture stents, the plurality of main capture stents are used to contract and expand radially, and the plurality of main capture stents are expanded to form a columnar mesh structure, the main capture stent includes: a first main wire material, and a second main wire material; the second bending portion in the first main wire material and the sixth bending portion in the second main wire material are hooked with each other. The first main wire material and the second main wire material are hooked with each other by multiple bending portions, so that the connection point of the stent mesh structure is changed from fixed to movable, which reduces the rigidity of the stent, and the stent can pass smoothly at the bend of the blood vessel, which is convenient for the operation.

Description

Technical Field

[0001] The invention relates to the field of medical thrombosis surgery, and in particular to a flexible vascular embolization recanalization device. Background Art

[0002] Stroke is a difficult-to-treat disease that seriously endangers human health and life safety in the world today. It is characterized by high morbidity and mortality. It is the second leading cause of death in the world and has become the leading cause of death for Chinese residents. Stroke is divided into ischemic stroke and hemorrhagic stroke. The incidence of ischemic stroke is higher than that of hemorrhagic stroke, accounting for about 70%-80% of the total number of strokes. After an ischemic stroke occurs, the blood supply to the brain is interrupted and energy is depleted, immediately causing damage to the brain tissue in the ischemic center and loss of some brain functions. The consequences of long-term vascular embolism are very serious, and it has always been a difficult point to treat.

[0003] At present, there are several main methods for the treatment of stroke: intravenous and intraarterial drug thrombolysis, ultrasonic thrombolysis, intravascular mechanical thrombectomy, etc. Although intravenous and intraarterial thrombolysis is a conventional method for the treatment of acute ischemic stroke, this method has strict requirements on the time window for thrombolysis in patients. Normally, the patient is required to be within 4.5 hours of onset or delayed by 1-2 hours, that is, it cannot exceed 6 hours at most, and its application is also limited by many factors, especially the recanalization rate of thromboembolic arterial occlusion will be greatly reduced.

[0004] For this reason, mechanical thrombectomy devices have received widespread attention since 2000. With the continuous development of new materials, new processes and medical imaging equipment, mechanical thrombectomy devices can intuitively and quickly open or extract occluded thrombi in blood vessels, especially embolism in large blood vessels, which greatly extends the time window in clinical treatment. A recent clinical investigation and study in the United States concluded that the time window for mechanical thrombectomy is as long as 24 hours, and the success rate of treating patients is as high as more than 40%, which completely improves the subsequent treatment effect.

[0005] As early as 2004, the U.S. Food and Drug Administration (FDA) approved the MERCI thrombectomy device, followed by the PHONEX thrombus removal device in 2006, the PENUMBRA thrombus aspiration device in 2008, the SOLITAIRE AB stent thrombectomy device in 2016, and the current various forms of thrombectomy devices. So far, mechanical thrombectomy devices have problems in clinical use.

[0006] The bracket of the catcher of the existing thrombus removal device adopts a mesh structure, which is directly laser engraved on the material, so that each connection point of the mesh structure is a whole. When the catcher of this structure contracts and stretches, the connection points of the mesh structure are fixed and cannot move relatively, resulting in strong rigidity of the bracket. The bracket cannot pass smoothly at the bend of the blood vessel, causing inconvenience to the operation.

[0007] Therefore, the prior art still needs to be improved and developed. Summary of the invention

[0008] In view of the above-mentioned deficiencies in the prior art, an object of the present invention is to provide a flexible vascular embolization recanalization device, wherein in the structure of the main capture device, a first main wire material and a second main wire material are hooked with each other through multiple bending portions, thereby changing the connection points of the stent mesh structure from fixed to movable, thereby reducing the rigidity of the stent, and the stent can pass smoothly through the bends of the blood vessel, facilitating the operation.

[0009] The technical solution of the present invention is as follows:

[0010] A flexible vascular embolization recanalization device includes a main capture device, the main capture device includes a plurality of main capture stents, the plurality of main capture stents are used to contract and expand radially, and the plurality of main capture stents are expanded to form a cylindrical mesh structure, the main capture stents include:

[0011] A first main wire, wherein the first main wire is provided with a plurality of first bending portions and a plurality of second bending portions, wherein the first bending portions extend along the cylindrical surface to one side, and the second bending portions extend along the cylindrical surface to the other side;

[0012] A second main wire, wherein the second main wire is provided with a plurality of fifth bending portions and a plurality of sixth bending portions, wherein the fifth bending portions extend along the cylindrical surface and in a direction away from the first bending portions, and the sixth bending portions extend along the cylindrical surface and in a direction close to the second bending portions;

[0013] The second bending portion and the sixth bending portion are hooked with each other;

[0014] The first bending portion is used to hook the fifth bending portion of the second main wire in the adjacent main capturing stent.

[0015] Furthermore, the first main wire is provided with a plurality of third bending portions, and the second main wire is provided with a plurality of seventh bending portions, and the third bending portions and the seventh bending portions are both extended in the radial direction.

[0016] Further, the distance between the bottom of the third bending portion near the far end and the axis is smaller than the distance between the bottom of the third bending portion near the end and the axis;

[0017] The distance between the bottom of the seventh bending portion at the far end and the axis is smaller than the distance between the bottom of the seventh bending portion at the near end and the axis.

[0018] Furthermore, the first main wire is provided with a plurality of fourth bending portions, and the second main wire is provided with a plurality of eighth bending portions, and the fourth bending portions and the eighth bending portions are extended in the same direction along the cylindrical surface.

[0019] Furthermore, after the main capture stents are expanded, a thrombus transition zone, a thrombus embedding zone, and a thrombus capture zone are sequentially formed from the proximal end to the distal end;

[0020] The thrombus migration zone is a cylindrical inner area covered by the first first bending portion, the first second bending portion, and the first third bending portion which are sequentially connected from the proximal end to the distal end;

[0021] The thrombus embedding area is a cylindrical inner area covered by the second first bending portion, the second second bending portion, and the second third bending portion which are sequentially connected from the proximal end to the distal end;

[0022] The thrombus capture area is a cylindrical inner area covered by the third first bend, the third third bend, the first fourth bend, the fourth third bend, and the second fourth bend, which are sequentially connected from the proximal end to the distal end.

[0023] Furthermore, three main capture brackets are provided, and one main capture bracket is hooked with the fifth bending portion of another adjacent main capture bracket through the first bending portion.

[0024] Furthermore, a distal guide head, an auxiliary catcher, and the main catcher for thrombus capture are sequentially arranged from the distal end to the proximal end.

[0025] Furthermore, the auxiliary capture device includes a plurality of auxiliary capture brackets, and the plurality of auxiliary capture brackets are used to contract and expand radially, and the plurality of auxiliary capture brackets form a mesh spherical shape after expansion, and the auxiliary capture brackets include:

[0026] A first auxiliary wire, wherein the first auxiliary wire is provided with a plurality of ninth bending portions and a plurality of tenth bending portions, wherein the ninth bending portions extend along the spherical outer surface to one side, and the tenth bending portions extend along the spherical outer surface to the other side;

[0027] A second auxiliary wire, wherein the second auxiliary wire is provided with a plurality of eleventh bending portions and a plurality of twelfth bending portions, wherein the eleventh bending portion extends along the spherical outer surface and in a direction away from the ninth bending portion, and the twelfth bending portion extends along the spherical outer surface and in a direction close to the tenth bending portion;

[0028] The tenth bending portion and the twelfth bending portion are hooked with each other;

[0029] The ninth bending portion is used to hook the eleventh bending portion of the adjacent second auxiliary wire.

[0030] Furthermore, three auxiliary capturing brackets are provided.

[0031] Furthermore, a developable connecting member for displaying the position is also included.

[0032] Furthermore, the developable connecting member includes a first developing connecting member and a second developing connecting member; the first developing connecting member is located at one end of the proximal end of the main trap, and the second developing connecting member is located between the main trap and the auxiliary trap.

[0033] Compared with the prior art, the present invention adopts a mutually hooking setting at the connection points of the first main wire and the second main wire, so that the wires can move relatively without being fixed, thereby changing the connection points of the main capture stent mesh structure from fixed to movable, reducing the rigidity of the main capture stent, and the main capture stent can pass smoothly at the turning point of the blood vessel; at the same time, the thrombus can change in the mesh structure formed by the main capture stent in accordance with the change of the main capture stent, so that the thrombus is better embedded in the mesh; while ensuring the support characteristics of the stent, the outer diameter of the mesh structure formed by the main capture stent can be compliantly changed, so as to better adapt to different curved blood vessels or variable diameter blood vessels; the main capture stent has better flexibility as a whole, because the shape of the blood vessel is not a completely ideal cylindrical shape, so each wire can have relative adjustment room to be more suitable for blood vessels of different shapes, the bending parts between the wires are hooked with each other, and the wires of the main capture stent are spatially combined as a whole, to prevent the stent from partially collapsing when the main capture stent is recovered to the microcatheter or passes through a tortuous blood vessel, so that the thrombus escapes. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a front view of an embodiment of a flexible vascular embolization recanalization device of the present invention;

[0035] Figure 2 It is a structural schematic diagram of an embodiment of a flexible vascular embolization recanalization device of the present invention;

[0036] Figure 3 It is a schematic structural diagram of an embodiment of a main capture device of a flexible vascular embolism recanalization device of the present invention;

[0037] Figure 4 It is a schematic structural diagram of an embodiment of a main capture device of a flexible vascular embolism recanalization device of the present invention;

[0038] Figure 5This is a schematic diagram of the structure of the first main wire in an embodiment of a main capture device of a flexible vascular embolization recanalization device of the present invention;

[0039] Figure 6 It is a schematic structural diagram of an auxiliary capture device in an embodiment of a flexible vascular embolization recanalization device of the present invention.

[0040] In the figure: 100, main capture device; 110, main capture bracket; 120, first main wire; 121, first bending portion; 122, second bending portion; 123, third bending portion; 124, fourth bending portion; 125, first connecting portion; 126, second connecting portion; 127, third connecting portion; 128, fourth connecting portion; 129, fifth connecting portion; 130, second main wire; 131, fifth bending portion; 132, sixth bending portion; 133, seventh bending portion; 134, The eighth bending portion; 140, thrombus migration zone; 150, thrombus embedding zone; 160, thrombus capture zone; 200, distal guide head; 300, auxiliary capture device; 310, auxiliary capture bracket; 320, first auxiliary wire; 321, ninth bending portion; 322, tenth bending portion; 330, second auxiliary wire; 331, eleventh bending portion; 332, twelfth bending portion; 400, developable connector; 410, first developing connector; 420, second developing connector. DETAILED DESCRIPTION

[0041] The present invention provides a flexible vascular embolization recanalization device. To make the purpose, technical solution and effect of the present invention clearer and more specific, the present invention is further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described here are only used to explain the present invention and are not used to limit the present invention.

[0042] like Figure 1 , Figure 2 , Figure 4 As shown, a flexible vascular embolism recanalization device includes a main capture device 100 for thrombus capture, and the main capture device includes a plurality of main capture stents 110. The plurality of main capture stents 110 are used to contract and expand radially. When the main capture stent 110 contracted into a line passes through the thrombus, the main capture stent 110 begins to release the constraint and expand. The expanded main capture device 100 is expanded by the plurality of main capture stents 110 to form a cylindrical mesh structure. The cylindrical mesh structure is hollow inside, so that the thrombus is expanded from the middle, and the blood passes smoothly from the middle of the cylindrical mesh structure, so as to achieve the effect of unblocking the blood vessel. The cylindrical mesh structure in this embodiment is set as a cylindrical mesh structure, and the cylindrical mesh structure is more easily adapted to the cylindrical blood vessel. It is easy to imagine that the main capture stent 110 can be expanded to form other structural shapes, such as a sphere. The cylindrical structure includes an irregular cylindrical shape, an elliptical cylindrical shape, a square column, etc.

[0043] like Figure 3 As shown (in order to facilitate the identification of the structure, a reference body is set inside the cylindrical mesh structure. In actual applications, the inside of the cylindrical mesh structure is hollow or has some thrombus blocks, but the thrombus blocks are difficult to fill the inside of the cylindrical mesh structure). After the main capture stents 110 are expanded, they form a cylindrical mesh structure. The main capture stents 110 include a first main wire 120 and a second main wire 130 wrapped around the first main wire 120. The first main wire 120 is provided with a plurality of first bending portions 121 and a plurality of second bending portions 122. The first bending portion 121 extends to one side along the cylindrical surface, and the second bending portion 122 extends to the other side along the cylindrical surface. The first bending portion 121 and the second bending portion 122 in this embodiment and the other bending portions mentioned below are all U-shaped structures. The extension direction of the bending portion refers to the depth direction of the U shape. Extending to one side along the cylindrical surface refers to extending in a clockwise or counterclockwise direction along the cylindrical surface. For ease of understanding, the first main wire 120 and the second main wire 130 can be understood as a mirror structure or most of the bending structures are mirror structures, and the mirror plane is a plane formed by the vertices of the second bending portions 122 and the central axis.

[0044] The second main wire 130 is provided with a plurality of fifth bending portions 131 and a plurality of sixth bending portions 132. The fifth bending portion 131 extends along the cylindrical surface and in a direction away from the first bending portion 121, and the sixth bending portion 132 extends along the cylindrical surface and in a direction close to the second bending portion 122. The second bending portion 122 of the first main wire 120 and the sixth bending portion 132 of the second main wire 130 in one main capture stent 110 are hooked with each other, specifically, the bottom of the U-shaped structure of the second bending portion 122 passes through the bottom of the U-shaped structure of the sixth bending portion 132 to form a chain structure hooked with each other; the first bending portion 121 of the first main wire 120 in the main capture stent 110 and the fifth bending portion 131 of the second main wire 130 in another adjacent main capture stent 110 are hooked with each other.

[0045] In this way, the connection points of the first main wire 120 and the second main wire 130 are hooked with each other, that is, the second bending portion 122 of the first main wire 120 in a main capture bracket 110 and the sixth bending portion 132 of the second main wire 130 are hooked with each other, and the first bending portion 121 of the first main wire 120 in the main capture bracket 110 and the fifth bending portion 131 of the second main wire 130 in another adjacent main capture bracket 110 are hooked with each other, so that the first main wire 120 and the second main wire 130 can move relatively without being fixed. When the main capture bracket 110 contracts, the first main wire 120 and the second main wire 130 are connected. The connection position of the wire 130 can be relatively movable and disengaged, and will not pull the main capture stent 110 due to being fixed, which is more conducive to the contraction of the main capture stent 110; when the main capture stent 110 contracts, the connection position of the first main wire 120 and the second main wire 130 adopts a movable hook connection structure. When the stent moves at a bend in the blood vessel, the first main wire 120 and the second main wire 130 can change shape according to the bending of the blood vessel wall without being affected by the tension of the connection part. In this way, the connection point of the stent mesh structure is changed from fixed to movable, which reduces the rigidity of the stent and allows the stent to pass smoothly at the bend in the blood vessel.

[0046] In order to make the function of the main capture stent 110 more complete, a plurality of third bending portions 123 are further provided on the first main wire 120, and a plurality of seventh bending portions 133 are further provided on the second main wire 130. The third bending portions 123 and the seventh bending portions 133 are both extended radially, that is, in a plurality of main capture stents 110, all the third bending portions 123 and all the corresponding seventh bending portions 133 surround to form a plurality of mesh groove structures, so that the thrombus located outside the main capture stent 110 can be embedded in the formed mesh groove, which facilitates the external thrombus to adhere to the main capture stent 110, thereby facilitating the thrombus to be dragged out of the blood vessel.

[0047] Thus, when the main capture stent 110 is opened, the first main wire 120 and the second main wire 130 are embedded in the thrombus plaque in the radial direction due to the elasticity of the material. At the same time, the third bend 123 and all the corresponding seventh bends 133 surround to form a plurality of mesh groove structures, and the first main wire 120 and the second main wire 130 are embedded in the thrombus plaque in the axial direction by using a hook structure and axial expansion. At present, all clinically applied stents are embedded in only one radial direction because of the fixed connection point. Therefore, the main capture stent 110 is used to capture the thrombus, which can open the blockage more quickly and the blood reflow speed is faster.

[0048] For the convenience of structural description, the end of the main capture device 100 held in hand during use is the proximal end (the end close to the user), and the end close to the thrombus is the distal end (the end away from the user and close to the patient, i.e. Figure 1One end of the distal guide head 200 is the distal end).

[0049] The third bend 123 and the seventh bend 133 in the present invention can be set according to the actual production situation. In this scheme, a setting form is proposed, in which the distance between the bottom of the third bend 123 near the distal end and the axis is smaller than the distance between the bottom of the third bend 123 near the end and the axis; the distance between the bottom of the seventh bend 133 near the distal end and the axis is smaller than the distance between the bottom of the seventh bend 133 near the end and the axis. In this way, the groove formed by the third bend 123 and the seventh bend 133 at the distal end makes the internal space of the entire cylindrical mesh structure smaller and smaller. Therefore, when the thrombus is captured inside the cylindrical mesh structure, the thrombus is not easy to leak out because the internal space of the distal cylindrical mesh structure is small, which is equivalent to the small mesh point at the distal end.

[0050] The first main wire 120 is also provided with a plurality of fourth bends 124, and the second main wire 130 is also provided with a plurality of eighth bends 134, and the fourth bends 124 and the eighth bends 134 are extended in the same direction along the cylindrical surface. The fourth bends 124 and the eighth bends 134 can be in the same direction clockwise or counterclockwise. In this way, the fourth bends 124 and the eighth bends 134 are evenly distributed structures, which is equivalent to the grids of the formed cylindrical mesh structure being evenly distributed, so that thrombus is not easy to leak out.

[0051] like Figure 4 , Figure 5 As shown, in order to make the structure of the main capture stent 110 more complete, the present embodiment also includes various connecting parts, which are located on the first main wire 120 and the second main wire 130. For the convenience of structural description, the first main wire 120 is mainly used as an example for explanation, the first connecting part 125 at the proximal central axis position, the first connecting part 125 is used to concentrate the head of all the first main wires 120 and the second main wires 130; the second connecting part 126 connected to the first connecting part 125 and inclined radially outward; the third connecting part 127 arranged parallel to the central axis, the third connecting part 127 is arranged in plurality, and the third connecting part 127 is used to connect the first bending part 121 and the adjacent second bending part 122; the fourth connecting part 128 connected to the bending part and inclined radially inward; the fifth connecting part 129 located at the distal central axis position, the fifth connecting part 129 is connected to the fourth connecting part 128 and is used to concentrate the tail of all the first main wires 120 and the second main wires 130. The angle between the second connection portion 126 and the central axis is between 30° and 65°. The angle between the fourth connection portion 128 and the central axis is between 30° and 65°. On the one hand, it provides a suitable radial support force for the stent. On the other hand, this section is arranged obliquely, which makes it easy to enter the microcatheter when withdrawing the stent.

[0052] like Figure 2 , Figure 4 As shown, in this embodiment, three main capture brackets 110 are provided. When the main capture brackets 110 are expanded, the three main capture brackets 110 are arranged in a circular array along the axis, and one main capture bracket 110 is hooked with the fifth bending portion 131 of another adjacent main capture bracket 110 through the first bending portion 121. The main capture device 100 formed by the main capture brackets 110 arranged in this way has a stable structure, and its supporting force can meet the functional requirements of supporting thrombus.

[0053] The diameters of the first main wire 120 and the second main wire 130 are equal or different. The first main wire 120 and the second main wire 130 can be cylindrical, elliptical, rectangular without sharp corners, etc. The materials of the first main wire 120 and the second main wire 130 are nickel-titanium alloy, tantalum, iridium, platinum, tungsten, etc., or medical stainless steel, medical polymer materials, etc.

[0054] like Figure 4 As shown, in this embodiment, after the main capture stents 110 are expanded, a thrombus transition area 140, a thrombus embedding area 150, and a thrombus capture area 160 are formed in sequence from the proximal end to the distal end. The thrombus transition area 140 is the internal area of ​​the columnar mesh structure covered by the first first bending portion 121, the first second bending portion 122, and the first third bending portion 123 which are sequentially connected from the proximal end to the distal end; in addition, a first connecting portion 125 is provided before the first first bending portion 121, and a second connecting portion 126 which is connected to the first connecting portion 125 is provided, and the tail end of the second connecting portion 126 is connected to the first first bending portion 121, and the first first bending portion 121 and the first second bending portion 122 are connected by the third connecting portion 127. The internal space of the columnar mesh structure formed in this area is large, which is equivalent to enlarging the mesh points thereon, which is conducive to capturing large thrombi.

[0055] The thrombus embedding area 150 is an inner area of ​​the columnar mesh structure covered by the second first bending portion 121, the second second bending portion 122, and the second third bending portion 123 which are sequentially connected from the proximal end to the distal end; in addition, the second first bending portion 121 and the second second bending portion 122 are connected by the third connecting portion 127. The columnar mesh structure space formed in this area is smaller than the columnar mesh structure space of the thrombus transition area 140, which is equivalent to that the mesh points thereon are smaller than the mesh points of the thrombus transition area 140, which is conducive to capturing medium-sized thrombi.

[0056] The thrombus capturing area 160 is a cylindrical inner area covered by the third first bending portion 121, the third third bending portion 123, the first fourth bending portion 124, the fourth third bending portion 123, and the second fourth bending portion 124, which are sequentially connected from the proximal end to the distal end. In addition, the second fourth bending portion 124 is connected to the fourth connecting portion 128, and the fifth connecting portion 129 is connected to the fourth connecting portion 128. The cylindrical mesh structure space formed in this area is smaller than the cylindrical mesh structure space of the thrombus embedding area 150, which is equivalent to that the mesh points on it are smaller than the mesh points of the thrombus embedding area 150, so that the thrombus can be prevented from leaking out of the cylindrical mesh structure space when the thrombus is dragged.

[0057] Different forms of thrombus plaques can be captured through the three-area settings. When the time window exceeds 6-8 hours, the thrombus coagulation or the coagulated thrombus when the time window is longer can be collected and embedded through the thrombus transition area 140 and the thrombus embedding area 150 of the main body capturer, and the thrombus plaques can be collected in the stent cavity to achieve the purpose of removing the thrombus.

[0058] like Figure 1 , Figure 2 As shown, a flexible vascular embolization recanalization device of the present invention is provided with a distal guide head 200, an auxiliary capturer 300, and the main capturer 100 for thrombus capture as described above in sequence from the distal end to the proximal end. When the flexible vascular embolization recanalization device further includes a microcatheter (not marked in the figure) wrapped around the distal guide head 200, the auxiliary capturer 300, and the main capturer 100 before being released, the main capturer 100 and the auxiliary capturer 300 are compressed and restrained in the microcatheter. When the capturer passes through the thrombus, the microcatheter is pulled out from the distal end to the proximal end, and the main capturer 100 and the auxiliary capturer 300 begin to release the constraint and expand. The expanded main capturer 100 expands the thrombus and captures the thrombus, and the auxiliary capturer 300 collects the small thrombus or plaque that escapes from the main capturer 100.

[0059] like Figure 2 , Figure 6As shown, the auxiliary capture device 300 includes a plurality of auxiliary capture brackets 310, and the plurality of auxiliary capture brackets 310 are used to contract and expand radially, and the plurality of auxiliary capture brackets 310 form a mesh sphere or a mesh ellipsoid after expansion. The auxiliary capture bracket 310 includes: a first auxiliary wire 320, and the first auxiliary wire 320 is provided with a plurality of ninth bending portions 321 and a plurality of tenth bending portions 322, the ninth bending portion 321 extends along the outer surface of the spherical surface to one side, and the tenth bending portion 322 extends along the outer surface of the spherical surface to the other side. Extension; second auxiliary wire 330, the second auxiliary wire 330 is provided with a plurality of eleventh bends 331 and a plurality of twelfth bends 332, the eleventh bend 331 extends along the spherical outer surface and away from the ninth bend 321, the twelfth bend 332 extends along the spherical outer surface and close to the tenth bend 322; the tenth bend 322 and the twelfth bend 332 are hooked with each other; the ninth bend 321 is used to hook the eleventh bend 331 of the adjacent second auxiliary wire 330. As described above for the structure and function of the main catcher 100, the specific functions and principles of the auxiliary catcher 300 are similar to those of the main catcher 100. In the mesh structure formed by the ninth bend 321, several tenth bends 322, the eleventh bend 331 and several twelfth bends 332 on the auxiliary capture bracket 310, the first auxiliary wires 320 and the second auxiliary wires 330 near the proximal end are sparsely distributed, which is equivalent to a large mesh opening, which facilitates the thrombus to enter the sphere, and the first auxiliary wires 320 and the second auxiliary wires 330 near the distal end are densely distributed, which is equivalent to a small mesh opening, which facilitates the interception of discrete small thrombi.

[0060] There are three auxiliary capture brackets 310. When the auxiliary capture brackets 310 are opened, the three auxiliary capture brackets 310 are arranged in an array along the axis, and one of the auxiliary capture brackets 310 is hooked with the eleventh bend 331 of another adjacent main capture bracket 110 through the ninth bend 321. The auxiliary capture device 300 formed by the auxiliary capture brackets 310 arranged in this way has a stable structure. When the main capture device 100 drags the thrombus, the supporting force generated by the auxiliary capture bracket 310 at the tail can prevent the thrombus from detaching. At the same time, the auxiliary capture device 300 can also be used to capture and collect small thrombi generated when the main capture device 100 opens the thrombus due to the lysis of the thrombus.

[0061] The flexible vascular embolization recanalization device of this embodiment also includes a developable connection member 400 for displaying the position. The developable connection member 400 is provided with two, namely, a first developable connection member 410 and a second developable connection member 420. The first developable connection member 410 is located at one end close to the end of the main capturer 100, and the second developable connection member 420 is located between the main capturer 100 and the auxiliary capturer 300. The first main wire 120 and the second main wire 130 are fixedly connected to the first developable connection member 410 through the first connection portion 125, and the first main wire 120 and the second main wire 130 are fixedly connected to the second developable connection member 420 through the fifth connection portion 129; the first main wire 120 and the second main wire 130 are fixedly connected to the developable connection member 400 by welding, screwing, caulking and locking.

[0062] The developable connecting member 400 can clearly display its shape on the screen during blood vessel imaging, and can accurately indicate the position of the flexible vascular embolization recanalization device when the flexible vascular embolization recanalization device is accompanied by thrombus.

[0063] The working process of this embodiment is that when the microcatheter passes through the thrombus block in the blood vessel and the main capture stent 110 has not been released, the six wires of the main capture stent 110 are basically in the shape of a comb willow straight line. When the main capture device 100 is released, each wire is opened from the distal end in sequence and simultaneously, and the thrombus is exerted radially and axially from the inside by the first main wire 120 and the second main wire 130. The main capture device 100 begins to embed and capture the thrombus plaque from the thrombus transition area 140 and the thrombus embedding area 150, and the orientation of the middle hollow channel can restore normal blood flow. Large thrombus plaques can be dragged and captured by the withdrawn main capture stent 110. When the thrombus moves to the distal end to the thrombus capture area 160 due to the withdrawal of the stent, it will be blocked by the third bend 123 and the seventh bend 133 in the mesh groove structure, and the thrombus supported outside the main capture stent 110 will be fixed. When a thrombus is embedded in the main capture device 100 , it is possible that the thrombus is lysed into small discrete thrombi, and these small discrete thrombi escape from the main capture device 100 . These escaped small discrete thrombi will be completely captured and collected by the auxiliary capture device 300 at the distal end.

[0064] In summary, compared with the prior art, the present invention adopts a mutually hooking setting through the connection points of the first main wire 120 and the second main wire 130, so that the wires can move relatively without being fixed, thereby changing the connection points of the stent mesh structure from fixed to movable, reducing the rigidity of the main capture stent, and the main capture stent can pass smoothly at the turning point of the blood vessel; at the same time, the thrombus can change in the mesh structure formed by the main capture stent in accordance with the change of the main capture stent, so that the thrombus is better embedded in the mesh structure; while ensuring the support characteristics of the stent, the outer diameter of the mesh structure formed by the main capture stent can be compliantly changed, so as to better adapt to different curved blood vessels or variable diameter blood vessels; the main capture stent has better flexibility as a whole, because the shape of the blood vessel is not a completely ideal cylindrical shape, so each wire can have relative adjustment space to be more suitable for blood vessels of different shapes, and the bending parts between the wires are hooked with each other, so that the wires of the main capture stent are spatially combined as a whole, so as to prevent the main capture stent from being partially collapsed when it is recovered to the microcatheter or passes through a tortuous blood vessel, so as to allow the thrombus to escape. Because the main capture stent's overall mesh structure has excellent permeability within the blood vessel, especially when the main capture device enters the blood vessel and reaches deep into the blood vessel, the stimulation and damage to the inner wall of the blood vessel after its expansion and contraction as well as its release and passage are minimized to avoid other complications.

[0065] It should be understood that the application of the present invention is not limited to the above examples. For ordinary technicians in this field, improvements or changes can be made based on the above description. All these improvements and changes should fall within the scope of protection of the claims attached to the present invention.

Claims

1. A flexible vascular embolization recanalization device, characterized in that: It includes a main capture device, which includes a plurality of main capture brackets, which are used to contract and expand radially, and form a columnar mesh structure after the main capture brackets are expanded. The main capture brackets include: A first main wire, wherein the first main wire is provided with a plurality of first bending portions and a plurality of second bending portions, wherein the first bending portions extend along the cylindrical surface to one side, and the second bending portions extend along the cylindrical surface to the other side; A second main wire, wherein the second main wire is provided with a plurality of fifth bending portions and a plurality of sixth bending portions, wherein the fifth bending portions extend along the cylindrical surface and in a direction away from the first bending portions, and the sixth bending portions extend along the cylindrical surface and in a direction close to the second bending portions; The second bending portion and the sixth bending portion are hooked with each other; The first bending portion is used to hook the fifth bending portion of the second main wire in the adjacent main capture stent; The first main wire is further provided with a plurality of third bending portions, and the second main wire is further provided with a plurality of seventh bending portions, and the third bending portions and the seventh bending portions are both extended radially; The first main wire is also provided with a plurality of fourth bending portions, and the second main wire is also provided with a plurality of eighth bending portions, and the fourth bending portions and the eighth bending portions are extended in the same direction along the cylindrical surface; After the main capture stents are expanded, a thrombus transition zone, a thrombus embedding zone, and a thrombus capture zone are formed in sequence from the proximal end to the distal end; The thrombus migration zone is a cylindrical inner area covered by the first first bending portion, the first second bending portion, and the first third bending portion which are sequentially connected from the proximal end to the distal end; The thrombus embedding area is a cylindrical inner area covered by the second first bending portion, the second second bending portion, and the second third bending portion which are sequentially connected from the proximal end to the distal end; The thrombus capture area is a cylindrical inner area covered by the third first bend, the third third bend, the first fourth bend, the fourth third bend, and the second fourth bend which are sequentially connected from the proximal end to the distal end; The flexible vascular embolization recanalization device also includes a developable connecting piece for displaying the position.

2. The flexible vascular embolization recanalization device according to claim 1, characterized in that: The main capture brackets are provided with three, and one of the main capture brackets is hooked with the fifth bending portion of another adjacent main capture bracket through the first bending portion.

3. The flexible vascular embolization recanalization device according to claim 1, characterized in that: A distal guide head, an auxiliary catcher, and the main catcher are sequentially arranged from the distal end to the proximal end.

4. The flexible vascular embolization recanalization device according to claim 3, characterized in that: The auxiliary capture device includes a plurality of auxiliary capture brackets, which are used to contract and expand radially, and form a mesh spherical shape after the auxiliary capture brackets are expanded. The auxiliary capture brackets include: A first auxiliary wire, wherein the first auxiliary wire is provided with a plurality of ninth bending portions and a plurality of tenth bending portions, wherein the ninth bending portions extend along the spherical outer surface to one side, and the tenth bending portions extend along the spherical outer surface to the other side; A second auxiliary wire, wherein the second auxiliary wire is provided with a plurality of eleventh bending portions and a plurality of twelfth bending portions, wherein the eleventh bending portion extends along the spherical outer surface and in a direction away from the ninth bending portion, and the twelfth bending portion extends along the spherical outer surface and in a direction close to the tenth bending portion; The tenth bending portion and the twelfth bending portion are hooked with each other; The ninth bending portion is used to hook the eleventh bending portion of the adjacent second auxiliary wire.

5. The flexible vascular embolization recanalization device according to claim 4, characterized in that: The number of auxiliary capturing brackets is three.

6. The flexible vascular embolization recanalization device according to claim 3, characterized in that: The developable connecting member includes a first developing connecting member and a second developing connecting member; The first developing connection piece is located at one end of the proximal end of the main trap, and the second developing connection piece is located between the main trap and the auxiliary trap.

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