CN113143405A

CN113143405A - Intravascular thrombus taking net disk support and conveying device thereof

Info

Publication number: CN113143405A
Application number: CN202110610592.9A
Authority: CN
Inventors: 胡文忠; 韩建超; 李世文; 周斌; 丁双喜
Original assignee: Shanghai Rongmai Medical Technology Co ltd
Current assignee: Shanghai Rongmai Medical Technology Co ltd
Priority date: 2021-06-01
Filing date: 2021-06-01
Publication date: 2021-07-23

Abstract

The invention discloses an intravascular thrombus taking net disk support and a conveying device thereof, and belongs to the technical field of vascular interventional medical treatment. The thrombus removal device comprises a conveying device and a thrombus removal net disc bracket; the thrombus taking net plate bracket comprises at least one conical disc-shaped net frame which is integrally manufactured; the tapered disk-shaped net rack is composed of a tapered part and a disk part, wherein the tapered part is located at the near end, the disk part is located at the far end, the near end of the tapered part is small, the far end of the tapered part is large, the diameter of the far end of the tapered part is smaller than that of the disk part, and the junction of the tapered part and the disk part is in smooth transition. The thrombus can be collected and blocked step by step, and the thrombus is prevented from escaping to the far end to block other blood vessel branches; the conical part of the conical disk-shaped net rack can better guide and recover the bracket to enter the suction catheter, so that the retraction force required by the bracket of the embolectomy net disk is reduced; the multi-section conical disc-shaped net rack is combined into a multi-section form, so that the flexibility and the adaptability of the thrombus taking net disk support in a bent blood vessel can be improved.

Description

Intravascular thrombus taking net disk support and conveying device thereof

Technical Field

The invention relates to an intravascular thrombus taking net disk support and a conveying device thereof, belonging to the technical field of vascular interventional medical treatment.

Background

Abnormal vascular access causes abnormal blood flow in blood vessels, and the hemodynamic abnormality can cause a series of adverse effects such as hypoxia, abnormal intravascular pressure, heavy heart load and even heart failure, so that the blood flow in the blood vessels needs to be restored or rebuilt through a catheter intervention technology. Narrowing or blockage of a blood vessel can cause turbulent or slow flow of blood, which can lead to the formation of obstructions such as thrombi, which can limit the blood supply to downstream regions of the vascular system. When a thrombus is located in the neurovascular system, a stroke may be initiated; when a thrombus is located in the pulmonary artery vasculature, pulmonary embolism may be triggered, leading to patient death. Accordingly, there is a need for an intravascular obstruction removal device and system that reduces the likelihood of obstructions, such as thrombus and fragments thereof, remaining in the vascular system while maximizing the probability of capturing the obstruction to reduce the risk of abnormal blood flow in the vessel.

With the development of technology, in recent years, a mechanical thrombus removal (PMT) device has appeared, which is a group of devices for removing blockages in blood vessels, and removes blockages such as thrombus and plaque in blood vessels by dissolving, crushing, aspiration, stent or basket thrombolysis, so as to restore blood circulation function.

Currently, the most widely used techniques for intravascular thrombus removal include embedding a thrombectomy stent within the thrombus and then performing thrombus capture and aspiration removal by pulling the thrombus within an aspiration catheter. For example, a segmented intracranial thrombus removal support structure disclosed in patent CN106580397A, a filter screen assembly and a thrombus suction assembly for removing pulmonary embolism thrombus disclosed in patent CN202020392829.1, and a basket type thrombus removal device disclosed in patent CN202011112928.0 all adopt a thrombus removal technology combining a thrombus removal support and a suction technology. Also included are the suction detachment embolectomy technique described in US patent 08366735B2, as well as the suction catheter embolectomy technique with a self-expanding tip described in US patent 5011488, the obstruction clearing system described in patent cn201780084363.x, an embolectomy stent device with proximal and distal protection described in patent CN211749877U, and the like.

The thrombus is captured by the stent and the obstruction such as the thrombus is removed by suction (namely negative pressure) of the suction catheter, so that the thrombus is generally safe and effective, but the thrombus of the thrombus taking stent embedded in the thrombus is easily extruded by the reticular stent to be cut and broken in the transfer process, and the broken thrombus easily escapes to the far end along the blood flow direction to block other blood vessel branches. Furthermore, when blood flows towards the distal end of the thrombus, the captured thrombus or other obstruction may break off during the transfer of the stent and flow to the distal end along the blood flow direction, and accumulate at other positions to block other branch vessels. In addition, some of the cylindrically-reticulated stent-retrieval devices collapse when subjected to vessel bending, thereby increasing the chances of the trapped thrombus escaping or breaking. For some obstructions that are usually attached to the vessel wall, it is difficult for conventional tubular mesh thrombectomy stents to scrape, capture and transfer the mural thrombus. Therefore, the thrombus taking support which has good flexibility and can adapt to tortuous and diameter-variable blood vessels is needed, the blood vessel adaptability and thrombus taking capturing capability can be improved, and the blood vessel is prevented from being damaged due to overlarge radial supporting force of the local lumen scaffold in the diameter-variable blood vessel. And meanwhile, the device can also remove obstructions such as mural thrombus with strong adhesive force with the vessel wall, and the like, and can also reduce the risk of breaking and escaping to the far end in the process of transferring the thrombus of the obstructions.

With respect to the known medical devices and methods, each has certain advantages and disadvantages. There is a continuing need to provide alternative medical devices and alternative methods for making and using medical devices. Therefore, the thrombus taking net disk support and the conveying device thereof in the blood vessel are provided, the thrombus taking support adopting the conical disk-shaped woven filter net adopts a multi-section conical disk-shaped filter net support structure, so that various blockages such as thrombus attached to the wall in the blood vessel can be scraped and collected in the transfer process of the blockages such as thrombus and the like, the grid structure at the tail part of the support can collect and block the broken thrombus from escaping towards the far end, and a plurality of sections of the conical disk-shaped filter net support are combined into a multi-section form, so that the flexibility of the thrombus taking support device in the bent blood vessel can be increased, the inward collapse of a net support structure is avoided, the risk that the blockages are broken and escape towards the far end is reduced, and the blockage removal efficiency is improved. The radial supporting force of the net disc of different sections can be changed by weaving different section densities, and the blood vessel is prevented from being damaged due to overlarge supporting force at the narrow blood vessel in the variable-diameter blood vessel.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the utility model provides an endovascular embolectomy net plate support and conveyor thereof, it has solved present embolectomy support and has had not enough pliability, the blockage clearance efficiency awaits improvement, the difficult problem of retrieving of embolectomy support.

The technical problem to be solved by the invention is realized by adopting the following technical scheme:

a thrombus taking net plate support in a blood vessel and a conveying device thereof comprise a conveying device and a thrombus taking net plate support, wherein the conveying device comprises a conveying outer pipe, a support fixing pipe and a head end telescopic pipe which are coaxially arranged from outside to inside;

the thrombus taking net plate bracket comprises at least one conical plate-shaped net frame which is woven by metal wires with shape memory effect;

the conical disk-shaped net rack is composed of a conical part and a disk part, the conical part is located at the near end, the disk part is located at the far end, the conical part is a conical net surface with a small near end and a large far end, the disk part is a disk-shaped net surface formed by one circle of rotation of a V-shaped curve, the diameter of the far end of the conical part is smaller than that of the disk part, and the connecting part of the conical part and the disk part is in smooth transition.

As a preferred example, at least one convex middle disk part is arranged between the proximal end and the distal end of the conical part, and the middle disk part is also a disk-shaped net surface formed by one rotation of a V-shaped curve.

As a preferred example, the intermediate disc portion on the tapered portion closer to the distal end has a larger diameter, and the diameter of the intermediate disc portion is not larger than the diameter of the disc portion.

As a preferred example, the convex web tops of the disks deflect towards the proximal or distal ends, and the convex web tops of the intermediate disks deflect towards the proximal or distal ends.

As a preferred example, the embolectomy mesh tray support comprises a plurality of conical disc-shaped mesh trays with different mesh densities.

The mesh density of the conical disk-shaped net racks is sequentially increased or decreased from the near end to the far end.

As a preferred example, the thrombectomy disk support comprises at least two conical disk-shaped racks, wherein the maximum diameter of the conical disk-shaped rack at the most distal end is larger than the maximum diameter of the conical disk-shaped racks at other positions.

As a preferred example, the embolectomy mesh tray support adopts at least two conical disc-shaped mesh frames, wherein the conical disc-shaped mesh frame at the far end has the highest weaving density, the near end of the conical disc-shaped mesh frame is fixed on the support fixing tube, and other conical disc-shaped mesh frames are sequentially woven outside the conical disc-shaped mesh frame at the far end.

As a preferred example, the joint of the bracket fixing tube and the thrombus taking net disk bracket and the distal end of the conveying outer tube are respectively provided with a developing ring.

The invention has the beneficial effects that:

(1) the thrombus taking net disc support of the device adopts a multi-section conical disc-shaped net frame structure, and a plurality of convex disc-shaped parts of the net frame structure can scrape and collect various blockages such as thrombus attached to the wall in a blood vessel;

(2) the conical disc-shaped net rack with more compact meshes can better collect and block thrombus and prevent the thrombus from escaping to the far end to block other blood vessel branches;

(3) the conical disc-shaped net rack with more sparse meshes can be better embedded into the interior of obstructions such as thrombus and the like by self-expansion, the capability of capturing the thrombus by the stent is improved, and the thrombus is prevented from falling to the far end in the transfer process of the stent;

(4) the conical part of the conical disc-shaped net rack can better guide and recover the bracket to enter the suction catheter, so that the withdrawing force required by the bracket of the embolectomy net disk is reduced, and the operation stability is improved;

(5) the multi-section conical disc-shaped net racks are combined into a multi-section form, so that the flexibility and the adaptability of the thrombus taking net disc support in a bent blood vessel can be improved, the inward collapse of a net-shaped thrombus taking net disc support structure in a tortuous blood vessel can be avoided, and the thrombus inlaying and capturing capacity is improved;

(6) the space between the convex disk parts of the conical disk-shaped net rack of the plurality of sections can accommodate more thrombus obstructions;

(7) under the condition of the same wire number, the larger the diameter of the conical disc-shaped net rack is, the weaker the supporting force is, and the vessel wall is protected from being damaged; the smaller the diameter of the conical disc-shaped net rack is, the stronger the supporting force is, and the conical disc-shaped net rack is favorable for being embedded into thrombus or cracking the thrombus;

(8) different densities are woven at different sections according to the needs, so that the radial supporting force of the net disc at different sections is changed, and the blood vessel is prevented from being damaged due to overlarge supporting force at the narrow blood vessel in the variable-diameter blood vessel.

Drawings

FIG. 1 is a schematic side view of the present invention;

FIG. 2 is a schematic perspective view of the present invention;

FIG. 3 is a schematic structural view of a thrombectomy screen tray support;

FIG. 4 is a schematic view of the distal end of the thrombectomy screen tray support;

FIG. 5 is a schematic view of a bracket structure of a thrombus removal net disk composed of 3 conical disk-shaped net racks;

FIG. 6 is a schematic view of a thrombectomy disk holder having 1 central disk;

FIG. 7 is a schematic view of a thrombectomy disk holder having 2 intermediate disks;

FIG. 8 is a schematic view of a thrombectomy disk holder having 4 intermediate disks;

FIG. 9 is a schematic view of the configuration of the disks, the middle disk and the distal end inclined thrombectomy mesh disk support;

FIG. 10 is a schematic view of the configuration of the disks, the intermediate disk and the proximally inclined embolic screen disk stent;

FIG. 11 is a schematic view of a configuration of a thrombectomy mesh disc holder with the disc portion oriented distally and the intermediate disc portion oriented proximally;

FIG. 12 is a schematic structural view of a thrombus removal mesh disk support with a fine proximal end and a sparse distal end;

FIG. 13 is a schematic structural view of a thrombus removal mesh disk holder with a fine distal end and a sparse proximal end;

FIG. 14 is a schematic view of a proximal fine, distal sparse embolic mesh disk stent having a medial disk-shaped portion;

FIG. 15 is a schematic view of a distal, fine, and proximal sparse embolic mesh disk stent having a medial disk;

FIG. 16 is a schematic structural view of a thrombus removal mesh disk support with a fine distal end and a sparse proximal end arranged in an overlapping manner;

FIG. 17 is a schematic view of a thrombus removal mesh tray support structure in which the distal conical disk-shaped mesh tray has a smaller maximum diameter than the other conical disk-shaped mesh trays;

FIG. 18 is a schematic structural view of a thrombus removal mesh disk holder with a fine distal end and a sparse proximal end;

FIG. 19 is a perspective view of a thin distal and thin proximal embolic mesh disk stent;

FIG. 20 is a schematic view of a thrombectomy mesh disc holder having a thin distal end and a thin proximal end and a central disc portion;

FIG. 21 is a schematic view of a woven structure at a density change of a thrombus removal mesh disk stent with a fine distal end and a sparse proximal end;

FIG. 22 is a schematic illustration of the delivery sheath withdrawn and the thrombectomy screen disc stent undeployed;

FIG. 23 is a schematic view of the delivery device being advanced over a guidewire into a thrombus in a vessel during a procedure;

FIG. 24 is a schematic view of the delivery device releasing the thrombectomy screen tray support during operation;

FIG. 25 is a schematic structural view of a thrombus scraping wall-attached thrombus of the thrombus taking mesh-disk stent during operation;

FIG. 26 is a schematic view of the thrombus removal mesh tray stent scraping thrombus into the aspiration catheter during operation;

FIG. 27 is a schematic structural view of thrombus removal from a tortuous blood vessel by the thrombus removal mesh disk stent.

In the figure: the device comprises a conveying device 1, an aspiration catheter 101, a conveying outer tube 102, a stent fixing tube 103, a head end telescopic tube 104, a head end guide cap 105, a thrombus taking net disc stent 2, a conical disc-shaped net frame 21, a conical part 211, a disc-shaped part 212, a middle disc-shaped part 213, a developing ring 3, a three-way catheter connecting seat 4, a hemostatic sealing valve 5, a guide wire 6, a blood vessel 7 and thrombus 8.

Detailed Description

In order to make the technical means, the original characteristics, the achieved purpose and the efficacy of the invention easy to understand, the invention is further described with reference to the specific drawings.

The embodiments described herein illustrate the inventive device in a form suitable for retrieving a thrombus 8 obstruction within the human vascular 7 system. It should be understood that the following examples discuss use in blood vessel 7. However, unless otherwise noted, variations of the apparatus and methods are not limited to use in removing thrombus 8 from blood vessel 7. Rather, the present invention can clear any occlusion or combination thereof as broadly defined above in the blood vessel 7. At the same time, the invention can have applicability in different parts of the human blood vessel 7. Further, the present utility may be used in a variety of processes where the benefits of the method and/or apparatus are desired.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

For the purposes of the following terms, the terms clot, thrombus 8, embolus and obstruction may be used synonymously. Although the present invention has been described with respect to an obstruction removal device, the device may also be used to capture blood clots, thrombus 8, emboli, foreign matter and other matter. An expandable guide tip on the device can engage blood clots, thrombus 8, emboli, foreign bodies, emboli, and other materials.

For ease of description, the following description uses the terms "proximal" and "distal", where "proximal" refers to the end proximal to the operative end and "distal" refers to the end distal to the operative end.

Example 1

As shown in fig. 1-5, an intravascular thrombus-taking net disk support and a conveying device thereof comprise a conveying device 1 and a thrombus-taking net disk support 2, wherein the conveying device 1 comprises a conveying outer tube 102, a support fixing tube 103 and a head end telescopic tube 104 which are coaxially arranged from outside to inside, the far end of the head end telescopic tube 104 is provided with a head end guide cap 105, the near end of the thrombus-taking net disk support 2 is fixed with the far end of the support fixing tube 103 or near the far end, and the far end of the thrombus-taking net disk support 2 is fixed with the far end of the head end telescopic tube 104 and the head end guide cap 105;

the embolectomy mesh-plate bracket 2 comprises at least one conical disc-shaped mesh frame 21 which is woven by metal wires with shape memory effect;

the tapered disk-shaped net rack 21 is composed of a tapered part 211 at the proximal end and a disk-shaped part 212 at the distal end, the tapered part 211 is small at the proximal end and large at the distal end, the disk-shaped part 212 is a disk-shaped net surface formed by one rotation of a V-shaped curve, the diameter of the distal end of the tapered part 211 is smaller than that of the disk-shaped part 212, and the junction of the tapered part 211 and the disk-shaped part 212 is in smooth transition.

The embolectomy mesh tray support 2 of the device adopts a multi-segment conical disc-shaped mesh frame 21 structure, and a plurality of convex disc-shaped parts 212 can scrape and collect various obstructions such as thrombus 8 attached to the inner wall of a blood vessel 7.

The conical part 211 of the conical disk-shaped net rack 21 can better guide and recover the bracket to the opening of the suction catheter 101, reduce the retracting force required by the embolectomy net disk bracket 2 and improve the operation stability.

The multi-section conical disc-shaped net racks 21 are combined into a multi-section form, so that the flexibility and the adaptability of the thrombus taking net disc support 2 in a bent blood vessel can be improved, the inward collapse of the structure of the net-shaped thrombus taking net disc support 2 in a tortuous blood vessel 7 can be avoided, and the capabilities of inlaying and capturing thrombus 8 are improved;

the space between the raised disks 212 of the multi-segmented conical disk shaped wire frame 2 can accommodate more thrombus 8 obstruction.

As shown in fig. 3, the developing ring 3 is provided at the junction of the stent fixing tube 103 and the thrombectomy screen disc stent 2, and at the distal end of the outer delivery tube 102. The position is convenient to observe.

Example 2

As shown in fig. 6, at least one convex middle disk 213 is arranged between the proximal end and the distal end of the conical part 211, and the middle disk 213 is also a disk-shaped mesh surface formed by one rotation of the V-shaped curve. The other portions are the same as in example 1.

Example 3

As shown in fig. 7 and 8, the intermediate disk portion 213 on the tapered portion 211 closer to the distal end has a larger diameter, and the diameter of the intermediate disk portion 213 is not larger than that of the disk portion 212. The other portions are the same as in example 2.

The diameters of the plurality of intermediate disk-shaped portions 213 become smaller from the distal end to the proximal end, so that the thrombus 8 can be gradually blocked from escaping to the distal end, and the intermediate disk-shaped portions can be better embedded and hooked into the inside of the thrombus 8. The tapered middle disk 213 also facilitates retraction into the suction catheter 101 lumen.

Example 4

As shown in fig. 9-11, the convex web tops of the disks 212 are deflected toward the proximal or distal ends, and the convex web tops of the intermediate disks 213 are deflected toward the proximal or distal ends. The other portions are the same as in example 3.

Example 5

As shown in fig. 12-15, the embolectomy screen tray support 2 comprises a plurality of conical disk-shaped screen frames 21 with different mesh densities.

The mesh density of the plurality of tapered disk-shaped wire frames 21 increases or decreases sequentially from the proximal end to the distal end. The other portions are the same as in example 1 or 2.

The conical disk-shaped net rack 21 with more compact meshes can better collect and block the thrombus 8, and prevent the thrombus 8 from escaping to the far end and blocking other branches of the blood vessel 7;

the conical disc-shaped net rack 21 with more sparse meshes can better self-expand the interior of the blockage such as thrombus 8 and the like, the capability of the stent for capturing the thrombus 8 is improved, and the thrombus 8 is prevented from falling to the far end in the transfer process of the stent.

As shown in fig. 16, the embolectomy mesh tray support 2 employs at least two tapered disk-shaped mesh frames 21, wherein the most distal tapered disk-shaped mesh frame 21 is woven with the highest density and the proximal end is fixed to the support fixing tube 103, and the other tapered disk-shaped mesh frames 21 are sequentially woven outside the most distal tapered disk-shaped mesh frame 21. The thrombus can be better prevented from escaping.

Example 6

As shown in fig. 17, the embolectomy screen tray support 2 comprises at least two tapered disc-shaped racks 21, wherein the maximum diameter of the most distal tapered disc-shaped rack 21 is larger than the maximum diameter of the tapered disc-shaped racks 21 at other positions. The other portions are the same as in example 1.

The preparation method comprises the following steps:

as shown in fig. 18-21, the tapered part 211 and the disk part 212 are integrally woven by using metal wires with shape memory effect and are heat-treated and shaped into the tapered disk-shaped wire frame 21 structure as shown in the figure. The specific weaving steps are as follows:

firstly, weaving a conical disc-shaped net rack 21 at the farthest end by a plurality of metal wires;

then, some of the wires are selected to be woven back distally, and the remaining wires continue to weave the next tapered disk-shaped wire frame 21 proximally (as shown in fig. 10), so that the tapered disk-shaped wire frame 21 closer to the proximal end is more sparse.

As shown in fig. 1, 24 and 25, the delivery device 1 further includes a three-way catheter connection seat 4 and a negative pressure suction device (not shown in the figures), the proximal end of the delivery outer tube 102 is connected with the three-way catheter connection seat 4, a flexible hemostatic sealing valve 5 is disposed at the proximal end of the three-way catheter connection seat 4, and the stent fixing tube 103 passes through the hemostatic sealing valve 5 and enters the inner cavity of the delivery outer tube 102. In addition, the conveying outer pipe 102 is inserted into the suction duct 101, the conveying outer pipe 102 and the near end of the suction duct 101 are sealed through a sealing valve plate, and the side surface of the suction duct 101 is externally connected with a negative pressure suction device. The head end extension tube 104 retracts relative to the bracket fixing tube 103, and the embolectomy net disc bracket 2 is unfolded.

The using method comprises the following steps:

as shown in fig. 22-26, during the procedure, the blood vessel 7 is punctured and a guidewire 6 (otherwise available) is introduced to completely traverse the lesion (thrombus 8) site. The delivery outer tube 102 of the delivery device 1 and the distal end of the suction catheter 101 are delivered to be close to the thrombus 8 under the guidance of the guide wire 6, and the delivery outer tube 102 and the suction catheter 101 are kept fixed.

At this time, the self-expandable thrombectomy-mesh-disc stent 2 fixed to the stent fixing tube 103 is pressed into the lumen of the outer delivery tube 102, and the thrombectomy-mesh-disc stent 2 delivery device 1 is passed through the lumen of the aspiration catheter 101 along the guide wire 6 to the site of the lesion (thrombus 8), while the tip end guide cap 105 is passed through the site of the lesion (thrombus 8).

Keeping the support fixing tube 103 fixed, and withdrawing the conveying outer tube 102 backwards to a certain distance until the developing ring 3 can be observed, and the embolectomy mesh disc support 2 radially expands and is completely unfolded. Waiting for a period of time, completely embedding the mesh plate bracket 2 to be thrombus-removed into the thrombus 8, and fully embedding and fusing the mesh plate bracket 2 and the thrombus 8. (the mesh density of the distal tapered disk-shaped net rack 21 of the thrombus taking net disk support 2 is higher, so that the distal end of the thrombus 8 can be prevented from escaping, the mesh density of the tapered disk-shaped net rack 21 closer to the proximal end is lower, the mesh density of the tapered disk-shaped net rack 21 closer to the proximal end can be better embedded into the thrombus 8, the space between the two ends of the tapered part 211 can contain more thrombus 8 and has better flexibility, and the mesh density can be better adapted to the tortuous shape of the blood vessel 7.)

Completely withdrawing the outer delivery tube 102 from the lumen of the aspiration catheter 101, or keeping the outer delivery tube 102 and the stent fixing tube 103 relatively fixed; then, the stent fixing tube 103 is withdrawn proximally, thereby bringing the thrombectomy-mesh-disk stent 2 slowly to move backward, and the mural thrombus 8 is scraped and transferred by the thrombectomy-mesh-disk stent 2 entirely to the vicinity of the distal opening of the aspiration catheter 101. The external negative pressure aspiration device is activated to provide a continuous negative pressure within the aspiration catheter 101 lumen, and the thrombus 8 is aspirated into the aspiration catheter 101 lumen under the negative pressure at the aspiration opening at the distal end of the device. At the same time, the thrombectomy mesh-disc stent 2 and the thrombus 8 are pulled into the lumen of the aspiration catheter 101 as a whole. In the process, the massive thrombus 8 is crushed by the thrombus removal mesh disk support 2 embedded in the massive thrombus, and simultaneously, the fragments are blocked in the thrombus removal mesh disk support 2 and are sucked and transferred to the outside of the human body. After the operation is finished, all the instruments are withdrawn from the human body together.

If the thrombus 8 is not completely removed, the thrombectomy mesh-disk stent 2 and the delivery device 1 thereof can be penetrated into the lesion site again through the suction catheter 101, and the above process is repeated until the thrombus 8 in the target area is completely removed.

In the basic implementation described above, during the transfer of the thrombus 8 into the lumen of the aspiration catheter 101, the thrombus 8, which is located inside the stent frame, is crushed into smaller pieces as the stent gradually narrows as it enters the orifice, and is thus more easily aspirated and transferred outside the body.

The thrombus taking net disk support 2 is provided with the conical part 211, so that on one hand, the thrombus taking net disk support 2 can be better guided into the suction opening, and meanwhile, the conical part 211 is favorable for reducing the withdrawing force of the thrombus taking net disk support 2 entering the suction catheter 101, and the stability of the operation is improved; on the other hand, the tapered portion 211 contributes to enhancing the radial supporting rigidity of the disk portion 212, facilitating scraping of the mural thrombus 8.

The mesh density of the distal disc portion 212 is dense, and can effectively prevent the thrombus 8 from escaping distally. The mesh density of the weave of the intermediate disk 213 may be set less than the mesh density of the distal disk 212, with the overall minimum mesh density of the proximal taper 211. Thus, the dense mesh sealing is favorable for preventing thrombus 8 from penetrating through the meshes to escape, and the sparse mesh density is favorable for embedding the stent into the thrombus 8 after radial self-expansion, so that the broken thrombus 8 can be better embedded and supported. The top of the disc-shaped part 212 is a circular arc top, so that the contact injury to the blood vessel 7 can be reduced, and the mural thrombus 8 can be better scraped;

as shown in fig. 27, the multi-segment tapered disk-shaped net rack 21 is combined into a multi-segment form, so that the flexibility and the adaptability of the thrombus taking disk stent 2 in the curved blood vessel 7 can be increased, and the inward collapse of the structure of the mesh thrombus taking disk stent 2 in the tortuous blood vessel 7 can be avoided, thereby improving the capability of inlaying and capturing thrombus 8; the space between the raised disks 212 of the multi-segmented conical disk shaped wire frame 21 can accommodate more thrombus 8 obstruction. The radial supporting force of the net disk with sparse density at the far end is smaller, so that the net disk can adapt to a thinner blood vessel section at the far end, and meanwhile, the supporting force of the net disk is not too large to damage the blood vessel. Because the net disk stent is squeezed less, the supporting force of the net disk stent on blood vessels is larger, and the supporting force of the net disk stent is smaller as the density of the net holes is smaller.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides an endovascular embolectomy net dish support and conveyor thereof, it includes conveyor (1) and embolectomy net dish support (2), conveyor (1) includes by outer transport outer tube (102), the fixed pipe of support (103), the flexible pipe of head end (104) that set up of outer to interior coaxial line, and flexible pipe of head end (104) distal end is equipped with head end direction cap (105), embolectomy net dish support (2) near-end is fixed with fixed pipe of support (103) distal end or near distal end, and embolectomy net dish support (2) distal end is fixed with flexible pipe of head end (104) distal end and head end direction cap (105), its characterized in that:

the thrombus taking net plate bracket (2) comprises at least one conical plate-shaped net frame (21) which is woven by metal wires with shape memory effect;

the conical disk-shaped net rack (21) is composed of a conical part (211) located at the proximal end and a disk-shaped part (212) located at the distal end, the conical part (211) is a conical net surface with a small proximal end and a large distal end, the disk-shaped part (212) is a disk-shaped net surface formed by one circle of V-shaped curve rotation, the diameter of the distal end of the conical part (211) is smaller than that of the disk-shaped part (212), and the connecting part of the conical part (211) and the disk-shaped part (212) is in smooth transition.

2. An endovascular embolectomy mesh-disc stent and delivery device thereof according to claim 1, wherein at least one convex middle disc-shaped part (213) is arranged between the proximal end and the distal end of the conical part (211), and the middle disc-shaped part (213) is also a disc-shaped mesh surface formed by one rotation of a V-shaped curve.

3. The endovascular embolectomy mesh disc stent and delivery device thereof according to claim 2, wherein the diameter of the intermediate disc part (213) on the tapered part (211) closer to the distal end is larger, and the diameter of the intermediate disc part (213) is not larger than that of the disc part (212).

4. The endovascular embolectomy mesh tray stent and delivery device thereof of claim 3, wherein the convex mesh surface top of the disc-shaped part (212) is deflected towards the proximal end or the distal end, and the convex mesh surface top of the middle disc-shaped part (213) is deflected towards the proximal end or the distal end.

5. An endovascular embolectomy mesh tray stent and delivery device thereof according to claim 1 or 2, wherein the embolectomy mesh tray stent (2) comprises a plurality of conical disc-shaped mesh frames (21) with different mesh densities.

6. The endovascular embolectomy mesh tray stent and delivery device thereof according to claim 1, wherein the embolectomy mesh tray stent (2) comprises at least two conical disk-shaped mesh frames (21), wherein the maximum diameter of the most distal conical disk-shaped mesh frame (21) is larger than the maximum diameter of the other conical disk-shaped mesh frames (21).

7. The endovascular embolectomy mesh tray stent and delivery device thereof according to claim 1, characterized in that the embolectomy mesh tray stent (2) adopts at least two conical disk-shaped mesh frames (21), wherein, the weaving density of the most distal conical disk-shaped mesh frame (21) is the maximum and the proximal end thereof is fixed on the stent fixing tube (103), and the other conical disk-shaped mesh frames (21) are sequentially woven outside the most distal conical disk-shaped mesh frame (21).

8. The endovascular embolectomy mesh disc stent and conveying device thereof according to claim 1, wherein the joint of the stent fixing tube (103) and the embolectomy mesh disc stent (2) and the distal end of the conveying outer tube (102) are respectively provided with a developing ring (3).