A winding type net disk support and conveying device thereof

Abstract

The present invention discloses a coiled mesh stent and a delivery device thereof, belonging to the field of vascular interventional medical technology. It comprises a delivery device and a thrombus removal stent, wherein the delivery device comprises a delivery outer tube and a stent fixing tube arranged coaxially from outside to inside, wherein at least one thrombus removal stent is fixed at the distal end of the stent fixing tube, and a head end guide cap is provided at the distal end of the stent fixing tube; the thrombus removal stent is made of a cylindrical woven mesh frame with a shape memory effect, and the distal end opening of the cylindrical woven mesh frame is rolled outward and heat-treated to be fixed. By arranging a thrombus removal stent with a distal end opening rolled outward on the stent fixing tube, the rolled out thrombus removal stent can be in close contact with the inner wall of the blood vessel, and after the thrombus is scraped off, it is collected in the curled space of the thrombus removal stent, which can improve the thrombus collection effect and thrombus removal efficiency; when scraping the thrombus, the curled thrombus removal stent is not easy to scratch the blood vessel wall; when recovered after release, the curled thrombus removal stent can be smoothly received into the delivery outer tube.

Description

Technical Field

[0001] The invention relates to a coiled mesh disc support and a conveying device thereof, belonging to the technical field of vascular interventional medical treatment. Background Art

[0002] Abnormal vascular channels cause blood to flow abnormally in the blood vessels. This hemodynamic abnormality can cause a series of adverse consequences such as tissue hypoxia, abnormal intravascular pressure, increased cardiac load and even heart failure. Therefore, catheter intervention technology is generally required to restore or reconstruct blood flow in the blood vessels. Vascular stenosis or blockage can cause blood turbulence or slow flow, which can lead to the formation of obstructions such as thrombi, resulting in restricted blood supply to the downstream areas of the vascular system. When a thrombus is located in the neurovascular system, it may cause a stroke; when a thrombus is located in the pulmonary artery vascular system, it may cause pulmonary embolism and lead to the death of the patient. Therefore, there is a need for an intravascular obstruction removal device and system to reduce the possibility of obstructions such as thrombi and their fragments being retained in the vascular system, while maximizing the probability of capturing obstructions to reduce the risk of abnormal vascular blood flow.

[0003] With the development of technology, percutaneous mechanical thrombectomy (PMT) devices have emerged in recent years. It is a group of instruments used to remove blockages in blood vessels. It uses dissolution, crushing, suction, stents or basket thrombectomy to remove blockages such as thrombi and plaques in blood vessels to restore blood circulation function. The clinical effect has been recognized by experts and has become a hot topic of research in recent years.

[0004] At present, the most widely used technology in intravascular thrombus removal technology includes embedding the thrombus removal stent into the thrombus, and then dragging the thrombus into the suction catheter to complete the purpose of thrombus capture and suction removal. For example, patent CN106580397A discloses a segmented intracranial thrombus removal stent structure, patent CN202020392829.1 discloses a filter assembly and thrombus suction assembly for pulmonary embolism thrombus removal, and patent CN202011112928.0 discloses a basket-type thrombus removal device, all of which adopt thrombus removal technology that combines thrombus removal stents with suction technology. It also includes the suction separation thrombectomy technology described in U.S. Patent US08366735B2, the suction catheter thrombectomy technology with a self-expanding head described in Patent US5011488, the obstruction removal system described in Patent CN201780084363.X, and the thrombectomy stent device with proximal protection and distal protection functions described in Patent CN211749877U.

[0005] The method of capturing thrombi with stents and removing thrombi and other obstructions by suction (i.e., negative pressure) with suction catheters is generally safe and effective. However, during the transfer process of the thrombus-removing stent embedded in the thrombus, the thrombus is easily squeezed and cut and broken by the mesh stent, and the broken thrombus easily escapes to the distal end along the blood flow direction and blocks other blood vessel branches. Moreover, when the blood flows toward the distal end of the thrombus, the captured thrombus and other obstructions may also break and fall off during the transfer of the thrombus-removing stent and flow to the distal end along the blood flow direction, and accumulate in other parts, blocking other branch blood vessels. In addition, some of the cylindrical mesh thrombus-removing stent devices will collapse when encountering a curved blood vessel, thereby increasing the chance of the captured thrombus escaping or breaking. For some obstructions that are usually attached to the blood vessel wall, it is difficult for traditional tubular mesh thrombus-removing stents to scrape, capture and transfer the wall thrombus. Therefore, a thrombus-removing stent with good flexibility that can adapt to tortuous blood vessels is needed to improve the adaptability of blood vessels and the ability to capture thrombus removal. At the same time, it can also remove obstructions such as mural thrombi that have strong adhesion to the blood vessel wall, and reduce the risk of obstructions such as thrombi breaking and escaping to the distal end during transfer.

[0006] As for the known medical devices and methods, each has certain advantages and disadvantages. There is a continuous need to provide alternative medical devices and alternative methods for manufacturing and using medical devices. Therefore, a rolled-up mesh stent and a delivery device thereof are proposed, which uses a thrombus removal stent with a distal opening rolled outward, and the thrombus removal stent has a good collection effect on thrombi, has little damage to blood vessels, and is easy to release and recover. Summary of the invention

[0007] The technical problem to be solved by the present invention is to provide a rolled mesh disc stent and a delivery device thereof, which solves the problems that the current thrombus removal stent has a need to improve its collection effect on thrombi, causes great damage to blood vessels, and is inconvenient to release and recover.

[0008] The technical problem to be solved by the present invention is achieved by adopting the following technical solutions:

[0009] A winding mesh disc support and a conveying device thereof, comprising a conveying device and a thrombus removal support, wherein the conveying device comprises a conveying outer tube and a support fixing tube coaxially arranged from outside to inside, at least one thrombus removal support is fixed at the distal end of the support fixing tube, and a head end guide cap is provided at the distal end of the support fixing tube;

[0010] The thrombus removal stent is made of a cylindrical woven mesh frame with a shape memory effect, and the distal opening of the cylindrical woven mesh frame is rolled outward and heat-treated to be shaped.

[0011] As a preferred example, the thrombus retrieval stent includes three types: a curved externally coiled thrombus retrieval stent, a folded line externally coiled thrombus retrieval stent and a combined externally coiled thrombus retrieval stent;

[0012] The curved external coiling thrombus retrieval stent is a mesh surface formed by rotating a continuous proximal line segment and a distal external coiling curve for one circle, and the mesh surface is a single-layer or double-layer structure;

[0013] The folded-line externally rolled thrombus retrieval stent is a mesh formed by rotating a multi-segment folded line for one circle, wherein the distal end of the folded line is rolled outward;

[0014] The combined external coiling thrombus retrieval stent is a mesh formed by rotating a multi-segment fold line at the proximal end and an external coiling curve at the distal end.

[0015] The distal end of the stent fixing tube is fixed with one or more combinations of three types of thrombectomy stents.

[0016] As a preferred example, the zigzag type external winding plug stent is a mesh surface formed by rotating 4 continuous line segments for one circle, wherein, arranged from the proximal end to the distal end, the cylindrical mesh surface formed by rotating the first line segment at the proximal end for one circle is fixed on the stent fixing tube, the second line segment rotates for one circle to form a conical mesh surface, the third and fourth line segments constitute an outwardly convex V-shaped zigzag line, and the V-shaped zigzag line rotates for one circle to form a V-shaped supporting mesh surface.

[0017] As a preferred example, the combined external coiling plug-removing stent is a mesh surface formed by rotating the first line segment at the proximal end, the second line segment and the external coiling curve at the distal end in sequence for one circle. The cylindrical mesh surface formed by rotating the first line segment for one circle is fixed on the stent fixing tube, the second line segment rotates for one circle to form a conical mesh surface, and the external coiling curve rotates for one circle to form an arched supporting mesh surface.

[0018] As a preferred example, the combined external coiling plug-removing stent is a mesh formed by rotating 7 consecutive proximal line segments and a distal external coiling curve for one circle, arranged from proximal to distal, the cylindrical mesh formed by rotating the first proximal line segment for one circle is fixed on the stent fixing tube, the second line segment rotates for one circle to form a conical mesh, the third and fourth line segment fold lines form an outwardly convex V-shaped fold line, the V-shaped fold line rotates for one circle to form a V-shaped supporting mesh, the fifth line segment rotates for one circle to form a reverse conical mesh, the sixth line segment rotates for one circle to form a cylindrical mesh, the seventh line segment rotates for one circle to form a conical mesh, and the external coiling curve rotates for one circle to form an arched supporting mesh.

[0019] As a preferred example, a plurality of combined external coiling stents are fixed at the distal end of the stent fixing tube. The diameters of the plurality of combined external coiling stents fixed at the distal end of the stent fixing tube gradually decrease from the distal end to the proximal end.

[0020] As a preferred example, a plurality of curved external coiling plug stents and a plurality of combined external coiling plug stents are fixed at the distal end of the stent fixing tube, and the curved external coiling plug stents and the combined external coiling plug stents are arranged at intervals.

[0021] As a preferred example, a plurality of folded-line external coiling plug stents and combined external coiling plug stents are fixed at the distal end of the stent fixing tube, and the folded-line external coiling plug stents and combined external coiling plug stents are arranged at intervals.

[0022] As a preferred example, the outer coiled tail of the thrombus removal stent is rolled into a ring.

[0023] As a preferred example, the curved external coiling plug stent adopts a double-layer mesh surface.

[0024] The beneficial effects of the present invention are:

[0025] (1) By arranging a thrombus removal stent with a distal opening that is rolled outward on the stent fixing tube, the rolled out thrombus removal stent can be in close contact with the inner wall of the blood vessel. After the thrombus is scraped off, it is collected in the curled space of the thrombus removal stent and sucked out of the body through a negative pressure suction device and a suction catheter, thereby improving the thrombus collection effect and thrombus removal efficiency. When scraping off the thrombus, the curled thrombus removal stent is not easy to scratch the blood vessel wall. When it is released and recovered, the curled thrombus removal stent can be smoothly put into the outer delivery tube.

[0026] (2) The top contact area of ​​the V-shaped support mesh is small, which causes less damage to blood vessels. The arched support mesh has stronger radial support and is more stable.

[0027] (3) The diameter of the combined external coiling thrombus removal stent gradually decreases from the distal end to the proximal end. The gradual diameter is conducive to scraping off the thrombus layer by layer.

[0028] (4) The tail of the stent is rolled into a ring to prevent the tip of the tail from damaging the blood vessel;

[0029] (5) During the release process, the coiled thrombectomy stent will automatically roll up from unfolding to coiling motion, breaking up large pieces of thrombus during the coiling motion, while wrapping the thrombus and transferring it to the suction catheter. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a side structural schematic diagram of the present invention;

[0031] Figure 2 It is a schematic diagram of the three-dimensional structure of the present invention;

[0032] Figure 3 This is a schematic diagram of the structure of the thrombectomy stent with the proximal end surface biased;

[0033] Figure 4 This is a schematic diagram of the structure of the thrombectomy stent with its end surface biased toward the distal end;

[0034] Figure 5 is a schematic diagram of the cross-sectional structure of the thrombus removal stent along the axis;

[0035] Figure 6 This is a schematic diagram of the structure of the proximal end surface of the thrombectomy stent;

[0036] Figure 7 It is a schematic structural diagram of a first embodiment of a curved external coiling plug retrieval stent;

[0037] Figure 8 It is a schematic structural diagram of a second embodiment of a curved external coiling plug retrieval stent;

[0038] Fig. 9 It is a schematic structural diagram of a first embodiment of a folded-line external coiling plug-removing stent;

[0039] Fig.10 It is a schematic structural diagram of a second embodiment of a folded-line external coiling plug-removing stent;

[0040] Fig.11 It is a schematic structural diagram of a first embodiment of a combined external coiling plug-removing bracket;

[0041] Fig.12 It is a schematic structural diagram of a second embodiment of a combined external coiling plug-removing bracket;

[0042] Fig.13 This is a schematic diagram of the combined structure of various types of thrombectomy stents used in the present invention;

[0043] Fig.14 This is a schematic diagram of the structure of the thrombus removal stent with multiple gradually changing diameters used in the present invention;

[0044] Fig.15 It is a schematic diagram of the structure of the curved external coiling bolt support and the combined external coiling bolt support arranged at intervals in the present invention;

[0045] Fig.16 It is a schematic diagram of the structure of the present invention using a folding line type external coiling plug bracket and a combined type external coiling plug bracket arranged at intervals;

[0046] Fig.17 This is a schematic diagram of the structure in which the outer coil tail of the thrombectomy stent is rolled into a ring;

[0047] Fig.18 It is a schematic diagram of the structure of a curved external coiling bolt stent using a double-layer mesh surface;

[0048] Fig.19 This is a schematic diagram of the structure of the thrombectomy stent located between the outer delivery tube and the stent fixing tube;

[0049] Fig. 20 It is a schematic diagram of the structure of the suction catheter and the delivery catheter being inserted through the guide wire during surgery;

[0050] Fig.21 It is a schematic diagram of the structure of extending the delivery catheter from the suction catheter during surgery;

[0051] Fig. 22This is a schematic diagram of the structure of exposing the thrombectomy stent from the delivery catheter during surgery;

[0052] Fig.23 Schematic diagram of the structure of the thrombus removal stent to collect thrombus during surgery;

[0053] Fig.24 This is a schematic diagram of the structure of the thrombectomy stent collecting thrombus to the suction tube port of the suction catheter during surgery.

[0054] In the figure: a conveying device 1, a conveying outer tube 101, a stent fixing tube 102, a head end guide cap 103, a suction catheter 104, a three-way catheter connecting seat 105, a hemostatic sealing valve 106, a thrombus removal stent 2, a curved outer coiled thrombus removal stent 21, a broken line outer coiled thrombus removal stent 22, a combined outer coiled thrombus removal stent 23, an outer coiled curve 24, a circular ring 25, a cylindrical mesh surface 26, a conical mesh surface 27, a V-shaped support mesh surface 28, an arched support mesh surface 29, a blood vessel 3, a guide wire 4, a thrombus 5, and a developing ring 6. DETAILED DESCRIPTION

[0055] In order to make the technical means, creative features, objectives and effects of the present invention easier to understand, the present invention is further described below with reference to specific illustrations.

[0056] The embodiments described herein illustrate the device of the present invention in a form suitable for retrieving a thrombus 5 blockage within a human vascular system 3. It should be understood that the following embodiments discuss use in a blood vessel 3. However, unless otherwise noted, variations of the device and method are not limited to use in clearing a thrombus 5 in a blood vessel 3. Rather, the present invention can clear any of the above-defined blockages or combinations thereof in a blood vessel 3. Also, the present invention can have applicability in different locations within a human blood vessel 3. Furthermore, the present utility can be used in a variety of processes in which the benefits of the method and / or device are desired.

[0057] Unless otherwise specified, all technical and scientific terms used in the present invention shall have the same meaning as commonly understood by those of ordinary skill in the art to which the present disclosure belongs. It should also be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having the meaning consistent with their context in the relevant art, and should not be interpreted as idealized or overly formal unless explicitly defined.

[0058] For the purposes of the following terminology, the terms blood clot, thrombus 5, embolus, and obstruction are used synonymously. Although the present invention describes only an obstruction removal device, the device can also be used to capture blood clots, thrombus 5, emboli, foreign matter, and other materials. The expandable guide tip on the device can engage blood clots, thrombus 5, emboli, foreign matter, emboli, and other materials.

[0059] For ease of description, the following description uses the terms “proximal end” and “distal end”, wherein the “proximal end” refers to an end close to the operating end and the “distal end” refers to an end far from the operating end.

[0060] Example 1

[0061] like Figure 1 , Figure 2 As shown, a winding mesh disc stent and its delivery device, which includes a delivery device 1 and a thrombus removal stent 2, the delivery device 1 includes a delivery outer tube 101 and a stent fixing tube 102 arranged coaxially from outside to inside, at least one thrombus removal stent 2 is fixed at the distal end of the stent fixing tube 102, and a head end guide cap 103 is provided at the distal end of the stent fixing tube 102;

[0062] like Figure 3-Figure 6 As shown, the thrombus removal stent 2 is made of a cylindrical braided mesh frame with a shape memory effect, and the distal opening of the cylindrical braided mesh frame is rolled outward and heat-treated to be shaped;

[0063] like Figure 7-Figure 13 As shown, the thrombus retrieval stent 2 includes three types: a curved external thrombus retrieval stent 21, a broken line external thrombus retrieval stent 22 and a combined external thrombus retrieval stent 23;

[0064] like Figure 7 , Figure 8 As shown, the curved external coiling plug-removing stent 21 is a mesh surface formed by rotating a continuous proximal line segment and a distal external coiling curve 24, and the mesh surface is a single-layer or double-layer structure;

[0065] like Fig. 9 , Fig.10 As shown, the folded line type externally rolled plug removal stent 22 is a mesh surface formed by rotating a multi-segment folded line for one circle, wherein the distal end of the folded line is rolled outward;

[0066] like Fig.11 , Fig.12 As shown, the combined external coiling plug-removing stent 23 is a mesh formed by rotating the multi-segment fold line at the proximal end and the external coiling curve 24 at the distal end for one circle;

[0067] like Fig.13 As shown, the distal end of the stent fixing tube 102 is fixed with various combinations of three types of thrombus removal stents 2 .

[0068] In this embodiment, a thrombus removal stent 2 with a distal opening rolled outward is provided on the stent fixing tube 102, so that the rolled out thrombus removal stent 2 can be in close contact with the inner wall of the blood vessel 3. After the thrombus 5 is scraped off, it is collected in the curled space of the thrombus removal stent 2 and sucked out of the body through the negative pressure suction device and the suction catheter 104, which can improve the thrombus 5 collection effect and thrombus removal efficiency; when scraping off the thrombus 5, the curled thrombus removal stent 2 is not easy to scratch the blood vessel wall; when recovered after release, the curled thrombus removal stent 2 can be smoothly received into the outer transport tube 101.

[0069] Example 2

[0070] like Fig. 9 As shown, the folded line external coiling embolization stent 22 is a mesh formed by rotating four continuous line segments, wherein, in order from the proximal end to the distal end, the cylindrical mesh 26 formed by rotating the first line segment at the proximal end is fixed on the stent fixing tube 102, the second line segment rotates once to form a conical mesh 27, the third and fourth line segments form an outwardly convex V-shaped fold line, and the V-shaped fold line rotates once to form a V-shaped support mesh 28. The other structures are the same as those in Example 1. The top contact area of ​​the V-shaped support mesh 28 formed by the folded line external coiling embolization stent 22 is small, and the damaged blood vessel 3 is small.

[0071] like Fig.10 As shown, in Fig. 9 On the basis of the above, another mesh-disk-shaped folded line external winding plug bracket 22 is added. The mesh-disk-shaped folded line external winding plug bracket 22 is a mesh surface formed by rotating 6 continuous line segments. Among them, from the proximal end to the distal end, the cylindrical mesh surface 26 formed by rotating the first line segment at the proximal end is fixed on the bracket fixing tube 102, and the second line segment rotates to form a conical mesh surface 27. The third and fourth line segments form an outwardly convex V-shaped fold line, and the V-shaped fold line rotates to form a V-shaped support mesh surface 28. The fifth line segment is symmetrical with the second line segment, and the sixth line segment is symmetrical with the first line segment. Other structures are similar to Fig. 9 The mesh-disk-shaped folded-line external coiled thrombus-removing stent 22 has better support, and the combination of the two has a better thrombus-removing effect.

[0072] Example 3

[0073] like Fig.11 As shown, the combined external coiling plug stent 23 is a mesh surface formed by rotating the first line segment at the proximal end, the second line segment and the outer coiling curve 24 at the distal end in sequence, the cylindrical mesh surface 26 formed by rotating the first line segment is fixed on the stent fixing tube 102, the second line segment rotates once to form a conical mesh surface 27, and the outer coiling curve 24 rotates once to form an arched support mesh surface 29. Other structures are the same as those in Example 1. The arched support mesh surface 29 formed by the combined external coiling plug stent 23 has stronger radial support force and is more stable.

[0074] Example 4

[0075] like Fig.12 As shown, the combined external coiling plug bracket 23 is a mesh formed by rotating the 7 consecutive proximal line segments and the distal external coiling curve 24 for one circle, arranged from the proximal end to the distal end, the cylindrical mesh 26 formed by rotating the first proximal line segment for one circle is fixed on the bracket fixing tube 102, the second line segment rotates for one circle to form a conical mesh 27, the third and fourth line segment fold lines form an outwardly convex V-shaped fold line, the V-shaped fold line rotates for one circle to form a V-shaped support mesh 28, the fifth line segment rotates for one circle to form a reverse conical mesh 27, the sixth line segment rotates for one circle to form a cylindrical mesh 26, the seventh line segment rotates for one circle to form a conical mesh 27, and the external coiling curve 24 rotates for one circle to form an arched support mesh 29. Other structures are the same as those in Example 1. The combined external coiling plug bracket 23 combines the advantages of both the V-shaped support mesh 28 and the arched support mesh 29.

[0076] like Fig.13 As shown, in Fig.12 Add one on the basis Fig.11 The combined outer winding bolt bracket 23 is provided.

[0077] Example 5

[0078] like Fig.14 As shown, a plurality of combined external coiling thrombus stents 23 are fixed at the distal end of the stent fixing tube 102, and the diameter of the combined external coiling thrombus stent 23 gradually decreases from the distal end to the proximal end. The other structures are the same as those in Example 1. The gradual diameter is conducive to scraping off the thrombus layer by layer.

[0079] Example 6

[0080] like Fig.15 As shown, a plurality of curved external coiling plug stents 21 and a plurality of combined external coiling plug stents 23 are fixed at the distal end of the stent fixing tube 102, and the curved external coiling plug stents 21 and the combined external coiling plug stents 23 are arranged at intervals. The other structures are the same as those in Example 1. The advantages of both the curved external coiling plug stent 21 and the combined external coiling plug stent 23 are combined, and the thrombus removal effect is better by relying on a plurality of thrombus removal stents 2.

[0081] Example 7

[0082] like Fig.16 As shown, a plurality of folded-line external coiling plug stents 22 and combined external coiling plug stents 23 are fixed at the distal end of the stent fixing tube 102, and the folded-line external coiling plug stents 22 and combined external coiling plug stents 23 are arranged at intervals. The other structures are the same as those in Example 1. The advantages of both the folded-line external coiling plug stents 22 and the combined external coiling plug stents 23 are combined, and the thrombus removal effect is better by relying on a plurality of thrombus removal stents 2.

[0083] Example 8

[0084] like Fig.17 As shown, the tail of the thrombus removal stent 2 is rolled outwardly into a ring 25. Other structures are the same as those in Example 1. The tail of the thrombus removal stent 2 is rolled outwardly into a ring 25 to prevent the tip of the tail from damaging the blood vessel 3.

[0085] like Fig.18 As shown, the curved external coiling plug-removing support (21) adopts a double-layer mesh surface.

[0086] In addition, if Figure 1 , Figure 2 As shown, the delivery device 1 also includes a suction catheter 104, a three-way catheter connection seat 105 and a negative pressure suction device (not shown in the figure), the proximal end of the delivery outer tube 101 is connected to the three-way catheter connection seat 105, and the proximal end of the three-way catheter connection seat 105 is provided with a flexible hemostatic sealing valve 106, and the stent fixing tube 102 passes through the hemostatic sealing valve 106 and enters the inner cavity of the delivery outer tube 101. In addition, the delivery outer tube 101 is inserted into the suction catheter 104, and the delivery outer tube 101 and the proximal end of the suction catheter 104 are sealed by a sealing valve sheet, and the side of the suction catheter 104 is externally connected to the negative pressure suction device. The thrombectomy stent 2 is fixed by the stent fixing tube 102. The distal ends of the delivery outer tube 101, the stent fixing tube 102, and the suction catheter 104 are all provided with a developing ring 6.

[0087] like Fig.19 As shown, during delivery, the thrombus removal stent 2 is tightly attached to the stent fixing tube 102 .

[0088] The thrombus removal stent 2 and the stent fixing tube 102 are inserted into the outer delivery tube 101 and delivered to the location of the thrombus 5 .

[0089] Directions:

[0090] like Fig. 20 As shown, during the operation, the blood vessel 3 is punctured, and the guide wire 4 (purchased separately) is introduced to completely pass through the lesion (thrombus 5). The distal ends of the delivery outer tube 101 and the suction catheter 104 of the delivery device 1 are delivered to the vicinity of the thrombus 5 under the guidance of the guide wire 4, and the delivery outer tube 101 and the suction catheter 104 are kept fixed.

[0091] like Fig.21 As shown, at this time, the self-expandable thrombus removal stent 2 fixed on the stent fixing tube 102 is pressed and gripped in the cavity of the outer delivery tube 101, and the thrombus removal stent 2 delivery device 1 follows the guide wire 4 through the inner cavity of the suction catheter 104 to reach the lesion (thrombus 5) site, and at the same time, the head end guide cap 103 passes through the lesion (thrombus 5) site.

[0092] like Fig. 22As shown, the stent fixing tube 102 is kept fixed, and the outer delivery tube 101 is withdrawn to a certain distance until the developing ring 6 can be observed, and the thrombus removal stent 2 is radially self-expanded and fully deployed. Wait for a period of time until the thrombus removal stent 2 is completely embedded in the thrombus 5 and fully embedded and fused with the thrombus 5.

[0093] like Fig.23 , Fig.24 As shown, the outer delivery tube 101 is completely withdrawn from the inner cavity of the suction catheter 104, or the outer delivery tube 101 and the stent fixing tube 102 are kept relatively fixed; then, the stent fixing tube 102 is withdrawn proximally, thereby driving the thrombus removal stent 2 to move slowly backward, and the wall thrombus 5 is scraped off and transferred to the vicinity of the distal opening of the suction catheter 104 as a whole by the thrombus removal stent 2. The external negative pressure suction device is started to provide continuous negative pressure to the cavity of the suction catheter 104, and the thrombus 5 is sucked into the cavity of the suction catheter 104 under the negative pressure at the distal suction opening of the device. At the same time, the thrombus removal stent 2 and the thrombus 5 are pulled into the inner cavity of the suction catheter 104 as a whole. In this process, the large thrombus 5 is squeezed and crushed by the thrombus removal stent 2 embedded therein, and the fragments are blocked in the thrombus removal stent 2 and are sucked and transferred to the outside of the human body together. The operation is over, and all instruments are withdrawn from the human body together.

[0094] If the thrombus 5 is not completely removed, the thrombus removal stent 2 and its delivery device 1 can be inserted into the lesion site again through the suction catheter 104, and the above process is repeated until the thrombus 5 in the target area is completely removed.

[0095] In the basic implementation process described above, when the thrombus 5 is transferred into the inner cavity of the suction catheter 104, the thrombus 5 inside the stent grid is squeezed and broken into smaller fragments as the stent enters the tube opening and is gradually compressed and narrowed, thereby being more easily suctioned and transferred out of the human body.

[0096] The basic principles, main features and advantages of the present invention are shown and described above. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A rolled-up mesh disc stent and a conveying device thereof, comprising a conveying device (1) and a thrombus removal stent (2), wherein the conveying device (1) comprises a conveying outer tube (101) and a stent fixing tube (102) coaxially arranged from outside to inside, wherein at least one thrombus removal stent (2) is fixed at a distal end of the stent fixing tube (102), and a head end guide cap (103) is provided at a distal end of the stent fixing tube (102), characterized in that: The thrombus removal stent (2) is made of a cylindrical woven mesh frame with a shape memory effect, and the distal opening of the cylindrical woven mesh frame is rolled outward and heat-treated to shape; The thrombus retrieval stent (2) comprises two types: a folded-line externally coiled thrombus retrieval stent (22) and a combined externally coiled thrombus retrieval stent (23); The folded line type externally rolled thrombus removal stent (22) is a mesh surface formed by rotating a multi-segment folded line for one circle, wherein the distal end of the folded line is rolled outward; The combined external coiling plug-removing stent (23) is a mesh formed by rotating a multi-segment fold line at the proximal end and an external coiling curve (24) at the distal end. The distal end of the stent fixing tube (102) is fixed with one or more combinations of two types of thrombectomy stents (2).

2. According to claim 1, a winding type mesh disk support and a conveying device thereof, characterized in that: The folded-line external coiling plug stent (22) is a mesh formed by rotating four continuous line segments one circle, wherein, arranged from the proximal end to the distal end, the first line segment at the proximal end rotates one circle to form a cylindrical mesh (26) fixed on the stent fixing tube (102), the second line segment rotates one circle to form a conical mesh (27), the third and fourth line segments form an outwardly convex V-shaped folded line, and the V-shaped folded line rotates one circle to form a V-shaped supporting mesh (28).

3. According to claim 1, a winding type mesh disk support and a conveying device thereof are characterized in that: The combined external coiling plug-removing stent (23) is a mesh surface formed by rotating the first line segment at the proximal end, the second line segment and the external coiling curve (24) at the distal end in sequence for one circle; the cylindrical mesh surface (26) formed by rotating the first line segment for one circle is fixed on the stent fixing tube (102); the conical mesh surface (27) is formed by rotating the second line segment for one circle; and the arched supporting mesh surface (29) is formed by rotating the external coiling curve (24) for one circle.

4. A winding type mesh disk support and a conveying device thereof according to claim 1, characterized in that: The combined external coiling plug-removing stent (23) is a mesh formed by rotating seven consecutive proximal line segments and a distal external coiling curve (24) one circle, arranged from the proximal end to the distal end. The cylindrical mesh (26) formed by rotating the first proximal line segment one circle is fixed on the stent fixing tube (102). The second line segment rotates one circle to form a conical mesh (27). The third and fourth line segment fold lines form an outwardly convex V-shaped fold line. The V-shaped fold line rotates one circle to form a V-shaped support mesh (28). The fifth line segment rotates one circle to form a reverse conical mesh (27). The sixth line segment rotates one circle to form a cylindrical mesh (26). The seventh line segment rotates one circle to form a conical mesh (27). The external coiling curve (24) rotates one circle to form an arched support mesh (29).

5. A winding type mesh disk support and a conveying device thereof according to claim 1, characterized in that: A plurality of combined external coiling plug stents (23) are fixed to the distal end of the stent fixing tube (102).

6. A winding type mesh disk support and a conveying device thereof according to claim 4, characterized in that: The diameters of the multiple combined external coiling plug stents (23) fixed at the distal end of the stent fixing tube (102) gradually decrease from the distal end to the proximal end.

7. A winding type mesh disk support and a conveying device thereof according to claim 1, characterized in that: A plurality of curved external coiling plug brackets (21) and a plurality of combined external coiling plug brackets (23) are fixed to the distal end of the bracket fixing tube (102), and the curved external coiling plug brackets (21) and the combined external coiling plug brackets (23) are arranged at intervals.

8. The winding type mesh disk support and the conveying device thereof according to claim 1, characterized in that: A plurality of folded-line external coiling plug brackets (22) and combined external coiling plug brackets (23) are fixed to the distal end of the bracket fixing tube (102), and the folded-line external coiling plug brackets (22) and combined external coiling plug brackets (23) are arranged at intervals.

9. A winding type mesh disk support and a conveying device thereof according to claim 1, characterized in that: The outer tail of the thrombus removal stent (2) is rolled into a ring (25).

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