CN115120305B

CN115120305B - Bolt taking device and bolt taking system

Info

Publication number: CN115120305B
Application number: CN202210824222.XA
Authority: CN
Inventors: 郭力友; 李爽; 夏洁
Original assignee: Suzhou Zhongtian Medical Device Technology Co ltd
Current assignee: Suzhou Zhongtian Medical Device Technology Co ltd
Priority date: 2022-07-13
Filing date: 2022-07-13
Publication date: 2024-04-30
Anticipated expiration: 2042-07-13
Also published as: CN115120305A

Abstract

The invention relates to the technical field of medical instruments, and particularly discloses a thrombus taking device and a thrombus taking system. The device comprises a guide piece and a thrombus taking module, wherein the guide piece extends along the length direction of a blood vessel; the thrombus taking module comprises a thrombus taking bracket and a first connecting ring, wherein the thrombus taking bracket is sleeved on the guide piece and comprises a bracket stretching end, a bracket catching net and a bracket converging end which are connected end to end; the support net forms a parallelogram grid which is spirally distributed around the axis of the guide piece, and the support net can drive the first connection to rotate around the axis of the guide piece. The device can enable the support to catch the net to rotate when the movement encounters obstruction through optimizing the structure of the parallelogram grid on the support to enable the bolt taking support to generate self-adaptive rotation so as to ensure the catching capability of the bolt and promote the bolt taking effect.

Description

Bolt taking device and bolt taking system

Technical Field

The invention relates to the technical field of medical instruments, in particular to a thrombus taking device and a thrombus taking system.

Background

Pulmonary artery embolism is a potentially life-threatening disease, and acute pulmonary artery embolism can lead to systemic hypotension and even total heart failure, leading to death of the patient, being one of three fatal cardiovascular diseases in parallel with myocardial infarction and stroke. The most common embolus in pulmonary embolism is thrombus. The common treatment modes at present mainly comprise treatment operation modes such as pulmonary artery intima stripping operation, thrombus suction, catheter internal thrombolysis, mechanical thrombus removal and the like. Among them, mechanical thrombus removal mainly removes thrombus by crushing, aspiration, stent or basket thrombus removal and the like, and is a hot spot of research in recent years. Mechanical embolectomy techniques use a suction device to aspirate a thrombus out of the body by engaging the stent after expansion with the thrombus and then pulling the thrombus into the aspiration catheter.

However, current thrombi removal devices primarily insert the stent into the thrombus and thereby withdraw the stent into the catheter along with the thrombus. However, thrombus can be broken and shed in the process of thrombus removal, and the shed thrombus can block downstream blood vessels along with blood flow.

Disclosure of Invention

The invention aims to provide a thrombus taking device and a thrombus taking system, so as to improve the capability of collecting emboli and improve the effect of thrombus taking operation.

To achieve the purpose, the invention adopts the following technical scheme:

A thrombus removing device which can be placed in a blood vessel and comprises a guide piece and a thrombus removing module; the guide extends along the length of the blood vessel; the thrombus taking module comprises a thrombus taking bracket and a first connecting ring, the thrombus taking bracket is sleeved on the guide piece and comprises a bracket extending end, a bracket catching net and a bracket converging end which are connected end to end, the bracket converging end is fixedly connected with the first connecting ring, and the first connecting ring is sleeved on the guide piece; the support net forms a parallelogram grid, the parallelogram grid is spirally distributed around the axis of the guide piece, and the support net can drive the first connection to rotate around the axis of the guide piece.

As a preferred technical scheme of the thrombus taking device, one first connecting ring and one connected thrombus taking bracket are used as a thrombus taking group, and at least one thrombus taking group is arranged.

As the preferable technical scheme of the thrombus taking device, two thrombus taking groups are arranged, the directions of the parallelograms on the two thrombus taking brackets which are spiral around the axis of the guide piece are opposite, so that the rotation directions of the two thrombus taking groups are opposite.

As the preferable technical scheme of the thrombus taking device, the peripheral wall of the guide piece is convexly provided with a limiting protrusion, and when the thrombus taking support moves relative to the guide piece, the first connecting ring is stopped by the first connecting ring and abuts against the limiting protrusion.

As the preferable technical scheme of the thrombus taking device, the parallelogram grid is provided with a long side and a short side, the ratio of the length of the long side to the length of the short side is larger than a proportional threshold, and the included angle between the long side and the short side is within an angle threshold range.

As a preferable technical scheme of the thrombus taking device, the proportion threshold value is 1.1, and the angle threshold value is in the range of 60-120 degrees.

As the preferable technical scheme of the thrombus taking device, the stretching end of the bracket is fixedly connected with a second connecting ring, and the second connecting ring is sleeved on the guide piece and can move along the length direction of the blood vessel.

As the preferable technical scheme of the thrombus taking device, the first connecting ring comprises a first inner ring, a middle ring and a first outer ring which are sequentially sleeved from inside to outside, wherein the middle ring is communicated with a plug interface, and the plug interface is communicated with the end face of the middle ring; the inserting port, the first inner ring and the first outer ring form an inserting groove, and the bracket converging end is inserted into the inserting groove.

The utility model provides a get system of taking out, includes distal end protection device and foretell device of taking out, distal end protection device includes braided wire and cover are located the device skeleton of guide, the one end of device skeleton is connected with the filter screen that braided wire formed, distal end protection device's opening with the opening of taking out the bolt support is just right.

As the preferable technical scheme of the thrombus taking system, the thrombus taking system further comprises a pushing rod, a guide catheter and a thrombus absorbing catheter which are sleeved in sequence from inside to outside, wherein the thrombus taking device and the distal end protecting device can be converged in the guide catheter, one end of the guide piece, which is far away from the distal end protecting device, is fixedly connected with the pushing rod, and the thrombus absorbing catheter is used for recovering emboli, the distal end protecting device and the thrombus taking device.

The invention has the beneficial effects that:

The thrombus taking device can avoid the obstruction of blood vessels to the support net by rotating in the withdrawing process of the thrombus taking device by means of the design of the parallelogram grid on the thrombus taking support, and further realize the self-adaptive rotation of the thrombus taking support around the axis of the guide piece, thereby enhancing the catching capacity of the thrombus, avoiding the falling-off condition of the thrombus in the withdrawing process and improving the thrombus taking operation efficiency. Meanwhile, the structural improvement ensures that the thrombus taking bracket has excellent flexibility and anti-torque damage capability, has good adherence capability in a bent blood vessel, and can adapt to blood vessels with different shapes; when encountering resistance in the retracting process, the thrombus taking support can also generate self-adaptive rotation, automatically avoid the resistance, and reduce the damage to blood vessels. The structure has the advantages of high thrombus taking efficiency, no damage to blood vessels, easy improvement of developing property and prevention of falling of emboli.

The embolic system can collect fallen and broken embolic scraps by means of the distal protection device to take out the embolic scraps outside the body, so as to prevent downstream vascular blockage. The filter screen can effectively realize the catching action of the emboli. The design that distal end protection device and thrombus taking support opening are just right can accomplish the surrounding to the embolus from both sides, and then has reduced the risk that the embolus breaks away from the thrombus taking system by a wide margin.

Drawings

Fig. 1 is a schematic structural diagram of a thrombus removal system according to an embodiment of the present invention;

FIG. 2 is a partially expanded view of a thrombolytic stent according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of another exemplary embodiment of a thrombolysis module according to the present invention;

FIG. 4 is a schematic view of another exemplary embodiment of a thrombolytic stent according to the present invention;

FIG. 5 is a schematic view of a distal end protection device according to an embodiment of the present invention;

FIG. 6 is a partially expanded view of a device skeleton provided in an embodiment of the present invention;

FIG. 7 is a partially expanded view of a skeleton weave and weave wires provided by an embodiment of the invention;

FIG. 8 is a partially expanded view of another alternative embolectomy bracket provided by an embodiment of the present invention;

FIG. 9 is a schematic structural view of a device skeleton and a braiding mandrel provided in an embodiment of the present invention;

FIG. 10 is a cross-sectional view of a first attachment ring provided in an embodiment of the present invention;

FIG. 11 is a cross-sectional view of a first attachment ring provided in an embodiment of the present invention;

FIG. 12 is a cross-sectional view of a third attachment ring provided in an embodiment of the present invention;

FIG. 13 is a partial cross-sectional view of a tie down system according to an embodiment of the invention;

FIG. 14 is a cross-sectional view of a vessel, embolic and a embolization system provided by an embodiment of the invention;

FIG. 15 is a second cross-sectional view of a vessel, embolic and an embolectomy system provided by embodiments of the present invention;

fig. 16 is a schematic structural view of another embolectomy system according to an embodiment of the present invention.

In the figure:

100. a thrombus taking device; 110. a thrombus taking bracket; 111. a stent extension end; 112. a bracket catches the net; 113. a bracket bundling end; 114. a bracket connector; 120. an inner tube; 121. an inner tube collar; 130. opening the end head; 140. a first connection ring; 141. a first inner ring; 142. a middle ring; 143. a first outer ring; 144. a plug-in groove; 150. an inner rod; 160. an inner rod end; 170. a second connecting ring;

200. A distal protection device; 210. a device skeleton; 211. a skeleton link; 212. a skeleton braiding part; 213. braiding holes; 214. a skeleton hole; 215. a skeleton connector; 220. weaving filaments; 230. a third connecting ring; 231. a second inner ring; 232. a second outer ring; 240. a fourth connecting ring; 300. a guide wire; 400. a push rod; 500. a guide catheter; 600. a thrombolysis catheter;

800. Braiding a mandrel; 910. a blood vessel; 920. emboli; 921. embolic debris.

Detailed Description

In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved more clear, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In the description of the present invention, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

The technical scheme of the invention is further described below by the specific embodiments with reference to the accompanying drawings.

As shown in fig. 1,2, 14 and 15, the present embodiment provides a thrombolytic device 100 capable of being placed within a blood vessel 910, including a guide and a thrombolytic module; the guide extends along the length of the vessel 910; the thrombus taking module comprises a thrombus taking bracket 110 and a first connecting ring 140, wherein the thrombus taking bracket 110 is sleeved on a guide piece and comprises a bracket extending end 111, a bracket catching net 112 and a bracket converging end 113 which are connected end to end, the bracket converging end 113 is fixedly connected with the first connecting ring 140, and the first connecting ring 140 is sleeved on the guide piece; the support catch net 112 forms a parallelogram grid which is spirally distributed around the axis of the guide, and the support catch net 112 can drive the first connecting ring 140 to rotate around the axis of the guide.

By means of the design of the parallelogram grid on the thrombus taking support 110, the thrombus taking device 100 can avoid the obstruction of the blood vessel 910 to the support catch net 112 in a rotating mode in the retracting process of the thrombus taking device 100, and further realize the self-adaptive rotation of the thrombus taking support 110 around the axis of the guide piece, thereby enhancing the catching capability of the thrombus 920, avoiding the falling-off condition of the thrombus 920 in the retracting process and improving the thrombus taking operation efficiency. Meanwhile, the structural improvement ensures that the thrombus taking support 110 has excellent flexibility and anti-torque damage capability, has good adherence capability in the bent blood vessel 910, and can adapt to the blood vessels 910 with different shapes; when encountering resistance during retraction, the thrombus taking support 110 can also generate self-adaptive rotation, so that the resistance is avoided automatically, and the damage to the blood vessel 910 is reduced. The structure has the advantages of high thrombus taking efficiency, no damage to the blood vessel 910, easy improvement of developing property and prevention of falling of the thrombus 920.

In this embodiment, the bracket stretching end 111 is a rod-shaped member, and one end is fixedly connected to the bracket capturing net 112; the stent extension end 111 is provided with at least one, and by fixing the developing material (developing ring or developing ring) to the stent extension end 111, the developability of the thrombolytic stent 110 can be enhanced. The bracket converging end 113 is a rod-shaped member, and is provided with at least one member, one end of the member is fixedly connected to the bracket capturing net 112, and the other end of the member is inserted into the first connecting ring 140.

Preferably, the thrombus-taking stand 110 is cut from a shape memory alloy tube, and then shaped and polished by heat treatment.

Specifically, the rotation direction of the thrombolytic stent 110 is determined according to the extension direction of the parallelogram grid.

In this embodiment, a first connection ring 140 and an associated one of the thrombolytic stents 110 are used as a thrombolytic group, and at least one of the thrombolytic groups is provided. The setting of the thrombus taking group is favorable for improving the thrombus taking capacity of the thrombus taking device 100, improves the catching capacity of the thrombus taking device 100 on the thrombus 920 with different sizes and shapes, reduces the probability of repeatedly taking the thrombus, and improves the efficiency of the thrombus taking operation.

As shown in fig. 3, 14 and 15, in another implementation of the present embodiment, two thrombolytic groups are provided, and directions of the parallelogram meshes on the two thrombolytic holders 110 spiral around the axis of the guide are opposite, so that the rotation directions of the two thrombolytic groups are opposite. The two thrombus taking groups are arranged at intervals along the extending direction of the guide piece, and the adjacent two thrombus taking groups can be overlapped in a partial area. Through the limitation of the rotation directions of the two thrombus taking groups, the action of the thrombus taking module during withdrawal can be adjusted, so that the thrombus taking capacity can be further improved, and the risk of falling of the thrombus 920 is reduced. In other implementations of this embodiment, the rotation directions of the two thrombolytic groups are the same.

With continued reference to fig. 2, further, the parallelogram grid has long sides and short sides, the ratio of the length of the long sides to the length of the short sides is greater than a proportional threshold, and the angle between the long sides and the short sides is within an angle threshold. The above design defines the dimension ratio of the long side to the short side and the range of the included angle, and completes the definition of the parallelogram grid, thereby helping to ensure the self-adaptive capability of the rotation of the thrombus taking support 110, and further enabling the rotation action of the first connecting ring 140 to be accurately and effectively completed.

In this embodiment, the ratio threshold is 1.1 and the angle threshold is in the range of 60 ° -120 °. Preferably, the ratio of the length of the long side to the length of the short side is within 1.5-3.

As shown in fig. 4, 14 and 15, in another implementation of the present embodiment, the stent extension end 111 is fixedly connected with a second connection ring 170, and the second connection ring 170 is sleeved on the guide member and can move along the length direction of the blood vessel 910. With the retraction or deployment of the stent graft 110, the second link 170 is free to slide, which facilitates delivery of the stent graft 110 and avoids damage to the vessel 910 from the stent extension end 111.

As shown in fig. 10, 11, 14 and 15, in this embodiment, the first connection ring 140 includes a first inner ring 141, a middle ring 142 and a first outer ring 143 that are sequentially sleeved from inside to outside, the middle ring 142 is penetrated by an insertion port, and the insertion port is communicated with an end surface of the middle ring 142; the plug-in port, the first inner ring 141 and the first outer ring 143 form a plug-in slot 144, and the bracket converging end 113 is plugged in the plug-in slot 144. Specifically, a bracket connector 114 is disposed at an end of the bracket converging end 113 away from the bracket capturing net 112, and the bracket connector 114 extends into the plugging slot 144 completely. The first inner ring 141 provides a penetrating space for the guide member, and the processing cost of the first connecting ring 140 is greatly reduced by means of the split design of the first inner ring 141, the middle ring 142 and the first outer ring 143 to form the insertion groove 144. The above design ensures the stable connection between the bracket convergent end 113 and the first connecting ring 140, and reduces the risk of the thrombus taking bracket 110 shifting or falling off in the process of thrombus taking.

Preferably, each member of the first connecting ring 140 is cut from a metal or polymer tube.

In this embodiment, the components of the connecting ring and the guide member may be connected together by glue bonding, laser welding, or the like. The specific connection mode is a conventional technical means in the field, and is well known by those skilled in the art, and is not repeated herein.

As shown in fig. 13, in the present embodiment, the outer peripheral wall of the guide member is convexly provided with a limiting protrusion, and when the thrombus-taking stand 110 is displaced relative to the guide member, the first connection ring 140 is stopped by the first connection ring 140 against the limiting protrusion. Under the condition that the thrombus taking support 110 is withdrawn or pushed forward, the limit protrusion drives the thrombus taking support 110 to move in a manner of being in direct contact with the first connecting ring 140 and ensures that the first connecting ring 140 can perform self-adaptive rotation, so that the thrombus taking device 100 can smoothly and stably run.

Preferably, the limiting protrusion is made of medical metal or polymer material, such as medical stainless steel, nickel-titanium memory alloy, cobalt-based alloy, titanium alloy or magnesium alloy, or developing material such as gold, platinum iridium, platinum tungsten or tantalum, so as to increase the proximal developing property of the thrombus taking support 110; the limit protrusion is connected to the inner tube 120 by means of glue bonding, laser welding or hot melt welding, etc.

In other implementations of this embodiment, the limiting protrusion is a spherical member, and the above design greatly reduces the contact area between the limiting protrusion and the first connection ring 140, thereby reducing the rotational resistance of the thrombus taking stand 110.

As shown in fig. 1, 14 and 15, the present embodiment also provides a embolectomy system that can be placed within a blood vessel 910, including an embolectomy device 100 and a distal protection device 200; the thrombus taking device 100 comprises a guide member and a thrombus taking module, the distal end protecting device 200 comprises a device framework 210, braiding wires 220 and a third connecting ring 230 which are connected end to end, the device framework 210 is sleeved on the guide member, one end of the device framework 210 is wound with the braiding wires 220, the braiding wires 220 are furled on the third connecting ring 230, the third connecting ring 230 is sleeved on the guide member, and an opening of the distal end protecting device 200 is opposite to an opening of the thrombus taking support 110.

The present embolic system, with the aid of the distal protection device 200, is capable of collecting dislodged and broken embolic debris 921 out of the body, preventing occlusion of the downstream vessel 910. The setting of filter screen can realize effectively the action of catching to the embolus 920, twines in the design of device skeleton 210 through braided wire 220 can realize the zonulae occludens of filter screen and device skeleton 210, has reduced the risk that distal end protection device 200 was damaged, and braided wire 220 draws in the design of third go-between 230 makes the filter screen mesh narrow gradually from the embolus 920 near-end to embolus 920 distal end, has realized the optimization to the filter screen effect of catching from this. The design of the distal protection device 200 opposite to the opening of the thrombus taking support 110 can complete the surrounding of the thrombus 920 from two sides, thereby greatly reducing the risk that the thrombus 920 is separated from the thrombus taking system. The split arrangement of the thrombus taking device 100 and the remote protection device 200 improves the thrombus taking operation flow of the thrombus taking system, can cope with complex thrombus taking working environment, can greatly improve the flexibility of work, and can also improve the efficiency of thrombus taking operation; through the design that the third connecting ring 230 is sleeved on the guide piece, the quick positioning of the distal protection device 200 and the thrombus taking device 100 can be realized, and the design of the split structure is ensured to still smoothly and accurately finish the thrombus taking operation.

The present extraction system is compact and both the distal end protection device 200 and the extraction device 100 facilitate improved visualization. The distal protection device 200 has the advantage of good adhesion, effectively reducing the risk of damage to the vessel 910. The filter screen is the toper structure, and the mesh of toper filter screen becomes little by the embolic 920 near-end to embolic 920 distal end gradually, and then can promote the effect of catching to different sizes embolic piece 921.

Specifically, the thickness of the filter screen is 10-1000 μm, and the mesh diameter of the filter screen is 10-1000 μm.

As shown in fig. 1, 5, 14 and 15, the filter screen separates the device framework 210 from the inner wall of the blood vessel 910, and the surface of the filter screen is smooth, so that the damage of the device framework 210 to the inner wall of the blood vessel 910 can be reduced; the diameter of the braided wire 220 is 0.05-0.3mm, and the material is medical polymer wire or medical metal wire; the filter screen can be internally provided with at least one developing wire such as platinum iridium, platinum tungsten, platinum and the like, so that the filter screen can be integrally developed. The specific material selection method of the filter screen is common knowledge in the field, and is well known by those skilled in the art, and is not repeated herein.

The above design allows the filter to collect emboli 920 without impeding blood flow. The device framework 210 is formed by cutting medical memory alloy tubes or braiding wires and then performing heat treatment for shaping; the filter screen is woven from medical wire or perforated from medical film, and can be coated on the outer surface of the device frame 210 by means of hot melting, bonding, welding, etc.

As shown in fig. 5-7, further, a skeleton connector 215 is disposed on the other side of the skeleton link 211, the skeleton connector 215 is fixedly connected to a fourth connecting ring 240, and the fourth connecting ring 240 is sleeved on the guide member. The fourth connecting ring 240 achieves the positioning effect of the device framework 210 and the guide member, further facilitates the positioning of the distal protection device 200 and the thrombus taking device 100, and simultaneously avoids the occurrence of the condition that the framework connecting rod 211 damages the blood vessel 910.

In this embodiment, the device skeleton 210 includes a skeleton link 211 and a skeleton weave portion 212 provided on one side of the skeleton link 211, the skeleton weave portion 212 forming skeleton holes 214, the skeleton holes 214 being uniformly spaced around the axis of the guide, the skeleton weave portion 212 being perforated with weave holes 213, the plurality of weave holes 213 being uniformly spaced around the skeleton holes 214; each of the braid wires 220 passes through one of the braid holes 213, and both ends are fixedly coupled to the third connecting ring 230. Specifically, the braid holes 213 are cut by laser. The connection structure of the braided wire 220 on the device framework 210 is simple, the connection strength is high, the problem of falling or deviation is not easy to occur, and the effect of the thrombus taking operation is ensured.

The above design ensures even distribution of the braid holes 213 on the frame link 211, with the interval d of each two adjacent braid holes 213 in the circumferential direction of the frame link 211 being the same. The reinforced convex plates are arranged near the braiding holes 213, so that the situation that the strength of the skeleton connecting rod 211 is reduced due to the arrangement of the braiding holes 213 is avoided, the strength of the skeleton connecting rod 211 is the same, and the expansion action of the skeleton connecting rod 211 is more uniform due to the arrangement.

Preferably, a portion of the skeleton weave portion 212, in which the skeleton holes 214 are formed, are spaced apart around the axis of the guide, is divided into a weave frame, and a storage net is formed by a third connection ring 230 connected to the weave frame through the weave wires 220, the weave wires 220 connected to the weave frame, and the weave frame; the storage net bag is provided with at least one, and the woven frame of the latter storage net bag is coaxially and fixedly connected with one end of the woven frame of the former storage net bag, which is far away from the thrombus taking device 100.

The setting of a plurality of net bags of accomodating makes the filter screen denser, helps improving distal end protection device 200's ability of fishing, has promoted distal end protection device 200 and has caught the effect to the embolic piece 921 of different sizes and shapes, has reduced the risk that embolic piece 921 blocks up blood vessel 910 again.

As shown in fig. 9, the process flow of the distal protection device 200 includes the following steps: sleeving the device framework 210 on the outer surface of the weaving mandrel 800, so that the device framework 210 and the weaving mandrel 800 are relatively fixed; passing the braid wires 220 through the braid holes 213, and connecting both ends of the braid wires 220 with a braiding machine; after the weaving is completed, the filter screen and the device framework 210 are heat-set together; after the shaping is completed, both ends of the braid wires 220 are fixed by the third connecting ring 230.

As shown in fig. 5-7 and 12, in the present embodiment, the third connection ring 230 includes a second inner ring 231 and a second outer ring 232 coaxially sleeved on the second inner ring 231, and the second inner ring 231 and the second outer ring 232 form a receiving cavity; both ends of the braided wire 220 are connected in the accommodating cavity in a penetrating way. Specifically, the second inner ring 231 is fixedly connected with the second outer ring 232.

The second inner ring 231 provides a penetrating space for the guide member, and the machining cost of the third connecting ring 230 is greatly reduced by virtue of the manner that the receiving cavity is formed by the split design of the second inner ring 231 and the second outer ring 232. The above design ensures the firm connection of the braided wire 220 and the third connecting ring 230, and reduces the risk of the filter screen shifting or falling off in the process of thrombus removal.

Specifically, the braid wires 220 are fixedly connected to the third connecting ring 230 by welding or glue bonding, etc. The second inner ring 231 can be cut from medical polymer or metal tubing, and the second outer ring 232 can be made of a developing material such as platinum iridium, platinum tungsten or platinum, so that the distal end of the embolic 920 is better in developing performance.

Through the mode of promoting the developability, can make the thrombus taking device 100 and the distal end protection device 200 can both wholly develop, and then help guaranteeing to take the accurate completion of the transportation, expansion and the withdrawal action of thrombus taking system.

With continued reference to fig. 1, 14 and 15, in this embodiment, the embolectomy system further includes a pushing rod 400, a guiding catheter 500 and a embolectomy catheter 600 that are sleeved in sequence from inside to outside, where the embolectomy device 100 and the distal protection device 200 can both be retracted within the guiding catheter 500, one end of the guiding element away from the distal protection device 200 is fixedly connected to the pushing rod 400, and the embolectomy catheter 600 is used to aspirate the embolus 920 during surgery and to recover the distal protection device 200 and the embolectomy device 100. The bolt taking system has the advantages of simple and reliable structure and stable operation, and ensures that the bolt taking operation by the bolt taking system can be successfully and efficiently completed through the mutual cooperation of the components.

In this embodiment, the guiding element includes an inner tube 120 and a guiding wire 300, wherein the end of the inner tube 120 near the distal protection device 200 is fixedly connected with an open end 130, the guiding wire 300 passes through the inner tube 120 and the open end 130, the first connecting ring 140 is sleeved on the inner tube 120, and the guiding wire 300 passes through the third connecting ring 230 and is connected with the distal protection device 200. The design of the low-rigidity guide wire 300 reduces the difficulty of positioning the guide piece and the distal protection device 200, and ensures that the guide piece and the distal protection device 200 smoothly and quickly complete the alignment operation.

Specifically, the limiting protrusion on the inner tube 120 is an inner tube convex ring 121, and the inner tube convex ring 121 is sleeved on the outer side wall of the inner tube 120.

The embodiment also provides a thrombus removing method, which is applied to the thrombus removing system and comprises the following steps:

step one: puncture is made at the target site and a puncture is made, and a retrieval system is passed through the puncture and into the embolic site of vessel 910, causing distal protection device 200 to pass through embolic 920, distally of the embolic site.

Step two: the guide catheter 500 is withdrawn, releasing the distal protection device 200, allowing the distal protection device 200 to gradually expand until it conforms to the interior wall of the vessel 910.

Step three: the embolic device 100 is guided through the embolic 920 by means of the guidewire 300 and the guide catheter 500, and the guide catheter 500 is retracted, releasing the embolic device 100, allowing the embolic device 100 to be gradually deployed until the embolic stent 110 completely encloses the embolic 920.

Step four: the guide catheter 500 is withdrawn from the vessel 910.

Step five: after the embolic stent 110 has fully bonded to the embolic 920, the embolic device 100 and the embolic 920 positioned in the embolic device 100 are withdrawn into the embolic catheter 600.

Step six: the distal protection device 200, and the embolic debris 921 located in the distal protection device 200, are withdrawn into the embolic catheter 600, and the embolic catheter 600 is withdrawn from the blood vessel 910.

The thrombus taking method smoothly completes the expansion action of the thrombus taking system by positioning and expanding the distal protection device 200, positioning the thrombus taking device 100 by the guide wire 300 and finally expanding the thrombus taking device 100; the planning of the flow is simple and accurate, the split design is utilized to ensure the flexibility of positioning the thrombus taking device 100 and the remote protection device 200, and the time for positioning the thrombus taking device 100 and the remote protection device 200 is effectively shortened, so that the thrombus taking operation is ensured to be successfully and efficiently completed. The method has the advantages of wide application range, simple and convenient operation and low workload, effectively simplifies the flow of the thrombus taking operation, reduces the risk of thrombus taking misoperation, improves the thrombus taking effect, reduces the risk of residual embolic debris 921 and ensures the personal safety of patients.

After deployment in vessel 910, the embolic stent 110 gradually expands as the temperature increases, combining with the emboli 920. If a single thrombolysis operation fails to completely clear the emboli 920, the thrombolysis device 100 may be redeployed for retrieval until the emboli 920 are completely cleared.

As shown in fig. 16, in another implementation of this embodiment, the guide member includes an inner rod 150 and a guide wire 300, wherein an inner rod end 160 is fixedly connected to an end of the inner rod 150 near the distal end protection device 200, the guide wire 300 passes through the inner rod 150 and the inner rod end 160, and the first connection ring 140 and the third connection ring 230 are respectively sleeved on the inner rod 150.

Specifically, the limiting protrusion on the inner rod 150 is an inner rod convex ring, and the inner rod convex ring is sleeved on the outer side wall of the inner rod 150.

The embodiment also provides another thrombus removing method, which is applied to the thrombus removing system and comprises the following steps:

Step one: puncture is made at the target site and a puncture is made, a retrieval system is passed through the puncture and into the embolic site of vessel 910, and guidewire 300 and inner rod 150 are passed sequentially through embolic 920, with distal protection device 200 being positioned distally of the embolic site.

Step two: the guide catheter 500 is withdrawn, releasing the distal protection device 200 and the embolic device 100, allowing the distal protection device 200 to gradually expand until it engages the inner wall of the vessel 910, allowing the embolic device 100 to gradually expand until the embolic stent 110 completely encloses the emboli 920.

Step three: the guide catheter 500 is withdrawn from the vessel 910.

Step four: after the stent 110 has been fully engaged with the embolic material 920, the push rod 400 is retracted toward the embolic catheter 600, the embolic device 100 and the distal protection device 200 are successively retracted within the embolic catheter 600, and the embolic material 920 within the embolic device 100 and embolic debris 921 within the distal protection device 200 are received within the embolic catheter 600.

Step five: the embolectomy catheter 600 is withdrawn from the vessel 910.

The method for removing the thrombus completes the unfolding action of the thrombus removing system by firstly utilizing the guide wire 300 to position the inner rod 150, then positioning the distal protection device 200 and the thrombus removing device 100 and finally unfolding the distal protection device 200 and the thrombus removing device 100, and the above procedures can also smoothly complete the unfolding action of the thrombus removing system; the thrombus taking method also ensures that the thrombus taking operation can be successfully and efficiently finished.

It is to be understood that the above examples of the present invention are provided for clarity of illustration only and are not limiting of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.

Claims

1. A thrombus taking system is characterized by comprising a distal protection device (200) and a thrombus taking device,

The thrombolysis device can be placed in a blood vessel (910) and comprises a guide member extending along the length direction of the blood vessel (910);

The thrombus taking module comprises a thrombus taking support (110) and a first connecting ring (140), wherein the thrombus taking support (110) is sleeved on the guide piece and comprises a support extending end (111), a support catching net (112) and a support converging end (113) which are connected end to end, the support converging end (113) is fixedly connected with the first connecting ring (140), and the first connecting ring (140) is sleeved on the guide piece;

The support catch net (112) forms a parallelogram grid which is spirally distributed around the axis of the guide piece, and the support catch net (112) can drive the first connecting ring (140) to rotate around the axis of the guide piece;

The distal end protection device (200) comprises a braiding wire (220), a device framework (210) sleeved on the guide piece and a third connecting ring (230), the device framework (210) is connected end to end, one end of the device framework (210) is connected with a filter screen formed by the braiding wire (220), the braiding wire (220) is furled in the third connecting ring (230), the third connecting ring (230) is sleeved on the guide piece, and an opening of the distal end protection device (200) is opposite to an opening of the thrombus taking support (110);

The distal protection device (200) is capable of collecting dislodged and broken embolic debris (921) out of the body, preventing downstream occlusion of the blood vessel (910);

-one of said first connection rings (140) and one of said thrombolytic holders (110) connected thereto as a thrombolytic group, said thrombolytic group being provided with at least one;

the two thrombus taking groups are arranged, the directions of the parallelogram grids on the two thrombus taking brackets (110) which are spiral around the axis of the guide piece are opposite, so that the rotation directions of the two thrombus taking groups are opposite;

The device framework (210) comprises a framework connecting rod (211) and a framework braiding part (212) arranged on one side of the framework connecting rod (211), wherein framework holes (214) are formed in the framework braiding part (212), the framework holes (214) are uniformly distributed at intervals around the axis of the guide piece, the framework braiding part (212) is penetrated with braiding holes (213), and a plurality of the braiding holes (213) are uniformly distributed at intervals around the framework holes (214); each braiding wire (220) passes through one braiding hole (213), and both ends of each braiding wire are fixedly connected to the third connecting ring (230);

the first connecting ring (140) comprises a first inner ring (141), a middle ring (142) and a first outer ring (143) which are sequentially sleeved from inside to outside, the middle ring (142) is communicated with an inserting port, and the inserting port is communicated with the end face of the middle ring (142); the plug-in connector, the first inner ring (141) and the first outer ring (143) form a plug-in groove (144), and the bracket converging end (113) is plugged in the plug-in groove (144).

2. The embolectomy system of claim 1, wherein the outer peripheral wall of the guide member is convexly provided with a limiting projection, and the first connecting ring (140) is stopped against the first connecting ring (140) against the limiting projection when the embolectomy holder (110) is displaced relative to the guide member.

3. The embolectomy system of claim 1 wherein the parallelogram grid has long sides and short sides, the ratio of the length of the long sides to the length of the short sides being greater than a proportionality threshold, and the angle of the long sides to the short sides being within an angle threshold.

4. A thrombolytic system according to claim 3, wherein said ratio threshold is 1.1 and said angle threshold is in the range of 60 ° -120 °.

5. The embolectomy system of claim 1, wherein the stent extension (111) has a second connector ring (170) affixed thereto, the second connector ring (170) being disposed over the guide member and being movable along the length of the vessel (910).

6. The thrombus removal system of claim 1, further comprising a push rod (400), a guide catheter (500) and a thrombus suction catheter (600) which are sequentially sleeved from inside to outside, wherein the thrombus removal device and the distal protection device (200) can be both retracted in the guide catheter (500), one end of the guide part, which is far away from the distal protection device (200), is fixedly connected with the push rod (400), and the thrombus suction catheter (600) is used for recovering the thrombus (920), the distal protection device (200) and the thrombus removal device (100).