CN210354988U - Bolt steering gear and conveying device thereof - Google Patents

Abstract

The utility model discloses a bolt steering gear and conveyor thereof, the device is including the bolt steering gear, the bolt steering gear is connected with the push rod, the bolt steering gear is compressed in leading-in sheath intraductally. The bolt steering gear comprises a supporting frame and a filter screen; the supporting frame comprises a bottom layer frame and at least one inner layer frame, the bottom layer frame and the at least one inner layer frame are arranged at intervals from low to high, and the distance between a near-end vertex and a far-end vertex of the bottom layer frame is greater than the distance between the near-end vertex and the far-end vertex of the inner layer frame; the filter screen is arranged outside the support frame and forms an arch structure. The utility model discloses a whole adherence of embolus steering gear is good, can cover three blood vessels of aortic arch lateral wall, can improve embolus steering rate, reduces the embolus escape, reduces the risk that embolus flow direction brain blood vessel leads to apoplexy.

Description

Bolt steering gear and conveying device thereof

Technical Field

The present invention relates to a medical device for preventing vascular embolization during surgery, and more particularly, to a device for cerebral vascular protection during cardiac and/or aortic surgery by collecting or diverting embolic debris.

Background

Some procedures involving the heart and aorta, such as cardiac surgery, cardiopulmonary bypass, catheter-based interventional cardiology, and ascending aorta, can form platelet polymers (e.g., thrombi, lipid droplets, bacterial clots, and/or other foreign bodies, tumor cells, or other small tissue fragments) or break-up and shed atherosclerotic debris from the artery wall, which can be transported with the blood stream into the cerebral blood circulation and other important systemic arterial systems to embolize blood vessels. Embolic material entering the cerebral blood circulation can occlude small arteries, resulting in localized cerebral vascular embolization, which has become a significant complication of cardiac and aortic surgery.

It has been shown that embolic protection devices are used to divert, capture or collect plaque, debris or thrombus of the anterior flow to prevent the formation of emboli during the procedure in order to prevent complications caused by embolic particles. For example, TAVR (a transcatheter aortic valve placement) surgery, it has been discovered in recent years that 1 out of 10 patients has a clinically significant stroke resulting from the surgery. Most strokes occur during or within 72 hours of surgery, which may be the result of loose plaque, debris on the native heart valve or aortic wall migrating to the brain. The Sentinel embolic protection product developed by Claret Medical, incorporated, designed two polymeric membrane filters that were inserted through the right radial arm artery and released into the brachiocephalic artery and the left common carotid artery. Through clinical studies, Sentinel allowed 63% reduction in clinical stroke during the first 72 hours post-TAVR.

The EMBOL-X product of Edwards Lifesciences is a device designed for open-heart surgery during extracorporeal circulation. The device is a filter screen inserted directly into the ascending aorta in close proximity to the heart, which filters all blood leaving the heart and bypassing the machine, and then passes it to the downstream circuit. Since emboss-X completely spans the aorta and a guide wire or catheter cannot pass through it without breaking its protective seal, the device has the limitation of being only suitable for open heart surgery and not for endovascular surgery.

An embolic protection device having an expandable tubular structure supporting a filter mesh material is disclosed in US 2004215167. The embolic protection device is compressed to a small diameter from the femoral approach into the patient's aorta and then expanded within the aorta, with the filter mesh material allowing blood to enter the side branch vessels connected to the aorta and preventing embolic material from entering the side branches. The device may be left at the aortic arch for long-term protection, or the device may be compressed and removed from the aorta. However, because the device is designed to be permanently implanted, its structure may damage the implantation site when the device is removed, making extraction from the aortic arch difficult.

US6258120 discloses an embolic protection device having a hollow tube with a cylindrical or conical wall that is impermeable to emboli and has an open end that allows blood to enter one end, flow through the hollow tube and exit the other end. This patent also discloses embolic protection devices that are planar rather than cylindrical in design. The main problem of this patent is that the embolic protection device is not fully adherent in the aortic arch, there is a risk of embolic material escaping from between the instrument and the vessel wall, in addition the instrument occupies the spatial space of the aortic arch, there is also a risk of hindering subsequent instrument operation.

Chinese patent CN106061434 discloses an embolic protection device of porous mesh material and having a cylindrical outer wall, having an open upstream end, a closed downstream end, a radially collapsed delivery configuration and a radially expanded configuration. The open upstream end of the device is placed in the aortic arch region for deflecting emboli flowing to the upstream vessel. The closed downstream end of the device is placed in the descending aorta for collecting emboli flowing to the downstream blood vessels. Although the device protects not only the upstream blood vessel but also the downstream blood vessel, the thrombus collection design of the device in the descending aorta area is very complex, occupies the whole cross-sectional space of the aorta, and adds great difficulty to the subsequent instrument operation, and different instrument kinks are easy to occur in the operation process, so that the operation cannot be carried out.

In summary, the conventional thrombus protection devices have the following problems:

(1) three blood vessels on the side wall of the aortic arch are not completely covered;

(2) the adherence of the apparatus is poor, and emboli escape exists;

(3) the instrument is inaccurate in positioning, the coverage area is small, and the area of a collateral vessel opening cannot be completely covered;

(4) the operation process of the instrument is complex;

(5) the instrument occupies too much aortic space, hindering subsequent instrument operation.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a embolus steering gear and conveyor thereof, its embolus steering gear can cover three blood vessels of aortic arch lateral wall to have good adherence performance, can improve embolus steering rate, reduce embolus escape, reduce the risk that embolus flow direction brain blood vessel leads to apoplexy.

The technical scheme adopted by the utility model to achieve the above purpose is to provide a bolt steering gear, which comprises a supporting frame and a filter screen; the supporting frame comprises a bottom layer frame and at least one inner layer frame, the bottom layer frame and the at least one inner layer frame are arranged at intervals from low to high, and the distance between a near-end vertex and a far-end vertex of the bottom layer frame is greater than the distance between the near-end vertex and the far-end vertex of the inner layer frame; the filter screen is arranged outside the support frame and forms an arch structure.

Further, the bottom layer frame is connected with the periphery of the filter screen, and the at least one inner layer frame is arranged between the bottom layer frame and the central point of the filter screen and is connected with the filter screen.

Further, the number of the inner frames is multiple, and the distance between the proximal vertex and the distal vertex of the multiple inner frames gradually decreases along the direction away from the bottom layer frame.

Further, the bottom layer frame is a plane structure, and the width of the far end of the bottom layer frame is larger than or equal to the width of the near end.

Further, at least one of the inner frames is in an arc-shaped structure in a direction towards the upper wall of the aortic arch, and the width of the far end of the inner frame is larger than or equal to the width of the near end.

Further, the distance between the proximal vertex and the distal vertex of the bottom layer frame is 30-120mm, the width of the distal vertex is 50-100mm, and the width of the proximal vertex is 30-60 mm.

Further, the distance between the proximal vertex and the distal vertex of the inner frame is 20-100mm, the width of the distal vertex is 20-80mm, and the width of the proximal vertex is 15-40 mm.

Further, the height of the filter screen in the direction perpendicular to the bottom layer frame is 2-60 mm.

Further, the aperture of the filter screen is 30-250um, and the mesh area of the filter screen accounts for 30% -80% of the total area of the filter screen.

Further, the surface of the filter screen is covered with a heparin or anti-hemagglutination drug coating; or the filter screen is made of a material containing an anti-hemagglutination medicine.

The utility model discloses a realize above-mentioned purpose and another technical scheme that adopts provides a embolus steering gear and conveyor thereof, including foretell embolus steering gear, push rod and leading-in sheath pipe, the embolus steering gear with the push rod is connected, the embolus steering gear compressed in leading-in sheath pipe.

Further, a distal end of the push rod is connected to a proximal or distal end of an inner frame of the embolic diverter.

Further, the device further comprises a first wire, wherein the distal end of the first wire is connected with the proximal end of the bottom layer frame of the embolus diverter, and the proximal end of the first wire is connected with the pushing rod.

Furthermore, the push rod is of a reducing structure with the outer diameter gradually increasing from the far end to the near end.

Further, the far end of the push rod is hinged with the near end or the far end of the inner frame of the embolus steering gear; or the far end of the push rod is provided with a first hook, and the near end or the far end of the inner layer frame of the embolus steering gear is provided with a first ring connected with the first hook.

Further, the distal end of the first wire is hingedly connected to the proximal end of the underlying frame of the embolic deflector; or the far end of the first silk thread is provided with a second hook, and the near end of the bottom layer frame of the embolus steering gear is provided with a second ring connected with the second hook.

Further, the distal end of the pushing rod is provided with a developing element.

The utility model discloses contrast prior art has following beneficial effect: 1. the embolus diverter adopts a structural design combining a multilayer frame structure and an arched filter screen, has better transverse supporting force, is more suitable for the adherence of an aortic vessel anatomical structure, prevents emboli from escaping from a gap between the embolus diverter and a vessel, and is released in an aortic arch without displacement caused by pulse constriction and high-flow blood scouring. 2. The embolus diverter is designed with a longer frame structure and a larger arched filter screen, can cover three blood vessels on the side wall of the aortic arch, and can also cover three blood vessel inlets under the condition of inaccurate positioning. 3. The inner layer frame of the embolus steering gear is connected with the pushing rod, the bottom layer frame is connected with the silk thread, and the silk thread is connected with the pushing rod. The connection of the three parts has certain directionality, and when the embolus diverter is conveyed to the aortic arch, the embolus diverter is always kept in the direction of the upper wall of the aortic arch. 4. The embolus diverter and the conveying device thereof enter the way from the femoral artery, the complexity of the operation is reduced, the three vessels on the side wall of the aortic arch can be covered, the wall sticking performance is good, the embolus diverting rate is improved, the escape of embolus is reduced, and the risk of stroke caused by the embolus flowing to the cerebral vessels is reduced.

Drawings

FIG. 1 is a schematic view of an aortic arch;

fig. 2 is a schematic view of an embolus diverter and a conveying device thereof provided in embodiment 1 of the present invention;

fig. 3 is a schematic view of the release of the embolus diverter in the aortic arch in embodiment 1 of the present invention;

fig. 4 is a schematic view of the overall structure of the bolt steering gear in embodiment 1 of the present invention;

fig. 5a is a schematic three-dimensional structure diagram of the bolt steering gear in the natural expansion state according to embodiment 1 of the present invention;

fig. 5b is a schematic top view of the bolt steering gear in the natural expansion state according to embodiment 1 of the present invention;

fig. 5c is a schematic front view of the bolt steering gear in the natural expansion state according to embodiment 1 of the present invention;

fig. 5d is a left side view structural schematic diagram of the bolt steering gear in the natural expansion state according to embodiment 1 of the present invention;

fig. 5e is a schematic view of the longitudinal section structure of the embolus diverter released from the aortic arch in embodiment 1 of the present invention;

fig. 6 is a schematic structural view of a push rod with a hook at a distal end according to embodiment 1 of the present invention;

fig. 7 is a schematic structural view of the supporting frame of embodiment 3 of the present invention, in which two ends of the supporting frame are provided with circular rings;

description of reference numerals:

10-an embolus diverter; 101-bottom layer frame, 102-inner layer frame, 103-third ring, 105-filter screen;

20-a push rod; 201-a first thread, 202-a first hook;

30, leading in a sheath;

b, thrombus;

w-thrombus flow direction;

h is the height of the arch radian vertex of the filter screen.

Detailed Description

The invention is further described with reference to the following figures and examples.

To more clearly describe the structural features of the present invention, the terms "proximal" and "distal" are used as the terms of orientation, wherein "proximal" refers to the end that is closer to the operator during the operation; "distal" means the end away from the operator. The term "or" is generally employed in its sense including "and/or" unless the content clearly dictates otherwise. The terms "inner", "outer", "left", "right" and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Example 1

Fig. 1 is a schematic diagram of a basic aortic arch related to the present embodiment, in which 3 larger arteries are emitted from the convex side of the arch, and are sequentially divided into a brachiocephalic artery, a left common carotid artery and a left subclavian artery from right to left.

Fig. 2 is a schematic diagram of the embolus diverter and its delivery device provided in this embodiment, the embolus diverter and its delivery device include an embolus diverter 10, a pushing rod 20, and an introducing sheath 30, the embolus diverter 10 is connected with the pushing rod 20, after the embolus diverter 10 is assembled with the pushing rod 20, the distal end (the end connected with the embolus diverter 10) of the pushing rod 20 and the whole embolus diverter 10 are compressed into the introducing sheath 30 for delivery. The embolus diverter 10 is conveyed into the aortic arch through the guide catheter lumen by the embolus diverter and the conveying device thereof provided by the embodiment, and the approach is performed in a preassembly mode or a non-preassembly mode through the femoral artery path, so that the approach path of the operation can be reduced, and the complexity of the operation is reduced.

Fig. 3 is a schematic view showing the release of the embolic deflector 10 in the aortic arch in this embodiment, and fig. 3 shows the configuration of the embolic deflector 10 released into the aortic arch, with the embolic deflector 10 released between the proximal end of the ascending aorta and the distal end of the descending aorta.

Fig. 4 is a schematic diagram of the overall structure of the embolus diverter 10 in this embodiment, and the embolus diverter 10 is composed of a supporting frame and a filter screen 105. The support frame functions to support the filter screen 105. The supporting frame is a three-dimensional shape formed by arranging a plurality of single-layer frames from low to high at intervals, the filter screen 105 is arranged outside the supporting frame and forms an arch structure, and the push rod 20 is connected with the supporting frame.

Referring to fig. 5 a-5 d, in this embodiment, the support frame of embolic deflector 10 is preferably comprised of a bottom layer frame 101 and an inner layer frame 102. The bottom frame 101 is preferably a planar structure having a distal width greater than or equal to a proximal width. The underlying frame 101 is made of nitinol material to accommodate different aortic arch diameters. The inner frame 102 is preferably curved in a direction toward the upper wall of the aortic arch, and has a distal width greater than or equal to a proximal width, which is capable of fitting well to the upper wall of the aortic arch and supporting the filtration screen 105. The distance between the near end vertex and the far end vertex of the bottom layer frame 101 is larger than that between the near end vertex and the far end vertex of the inner layer frame 102, the supporting frame structure can better adapt to the aorta anatomical structure, the diameter of a blood vessel from ascending aorta to descending aorta is gradually reduced, if the bottom layer frame 101 and the inner layer frame 102 are designed to be the same as the distance between the near end vertex and the far end vertex, the inner layer frame 102 can be attached to the wall badly, the filter screen 105 generates excessive folds, and emboli can easily escape from gaps. In other embodiments, the bottom layer frame 101 may have another planar structure or a three-dimensional structure, the inner layer frame 102 may also have a planar structure or another three-dimensional structure, and the shapes of the bottom layer frame 101 and the inner layer frame 102 may also be irregular patterns, which is not limited in this embodiment.

Referring to fig. 5b, in the present embodiment, the width of the bottom layer frame 101 is preferably 30-130mm, preferably 70-120mm, the width of the distal end is 50-100mm, and the width of the proximal end is 30-60 mm. The inner frame 102 has a width of 20 to 100mm, preferably 50 to 80mm, a distal width of 20 to 80mm, preferably 40 to 60mm, and a proximal width of 15 to 40 mm. In other embodiments, the inner frame 102 may be multiple, each having a width within this size range. In addition, the bottom layer frame 101 and the inner layer frame 102 may be configured as a symmetrical structure with a distal width equal to a proximal width. As shown in fig. 3, the embolic deflector 10 of the present embodiment is attached to the wall of the aortic arch after being released in the aortic arch, the bottom frame 101 is connected to the periphery of the filtering mesh 105, and the inner frame 102 is disposed between the center points of the bottom frame 101 and the filtering mesh 105 and connected to the filtering mesh 105. The bottom layer frame 101 plays a role in fixing the filter screen 105, and the inner layer frame 102 plays a role in supporting the filter screen 105 to be in an arch shape, so that the embolus steering device 10 can be well attached to the upper wall of an aortic arch, blood flow rising from the brachiocephalic trunk artery, the left common carotid artery and the left subclavian artery can be filtered in the operation process, and the embolus is blocked by the embolus steering device 10 to flow along the direction W shown by the arrow in fig. 3.

Further, the size of the inner frame 102 satisfies: can cover the three vessels of the aortic arch side wall and can cover the entrances of the three vessels of the aortic arch side wall in the case of inaccurate positioning of the underlying frame 101. The bottom layer frame 101 of the embolus diverter 10 is released in the aortic arch to play a role in positioning the filter screen 105, so that the filter screen 105 cannot be well supported in the use of blood flow and matched instruments, but under the conditions of pulse contraction and high-flow blood flushing, the bottom layer frame 101 is easy to displace, so that the filter screen 105 cannot be well supported, particularly, three blood vessels on the side wall of the aortic arch are easy to collapse, wrinkle and the like to cause thrombus escape, and the longer length design of the inner layer frame 102 just plays a role in strengthening the sealing effect of the three blood vessels on the arch, the filter screen 105 is arranged on the bottom layer frame 101 and the inner layer frame 102, and the inner layer frame 102 can also support the filter screen 105, so that the filter screen can be better attached to an arch-shaped curved surface.

Referring to fig. 5c and 5d, the curvature of the inner frame 102 is preferably similar to the curvature of the arched filter screen 105. The radian of the inner frame 102 is designed to be a semi-spherical top-like shape which mainly supports the filter screen 105, and the radian of the inner frame 102 is matched with the arched radian of the filter screen 105. The inner frame 102 conforms generally to the arcuate surface of the filter screen 105. The curved inner frame 102 better seals three vessels in the aortic arch when the embolic deflector 10 is released into the arch. The bottom layer frame 101 achieves a first seal in the aortic arch and the inner layer frame 102 achieves a second seal in the upper wall of the arch.

Specifically, each layer of the frame of the tie-back deflector 10 is not on the same plane, and the inner layer frame 102 is assembled at a position higher than the lower layer frame 101 in the vertical direction, and both form a staggered structure. The filter screen 105 is disposed outside the supporting frame, the filter screen 105 and the corresponding bottom layer frame 101 or the inner layer frame 102 are connected to each other by one or more methods such as sewing, gluing, hot pressing, ultrasonic welding, laser welding, and high-frequency welding, preferably, the bottom layer frame 101 is combined with the filter screen 105, the inner layer frame 102 is attached to or combined with the filter screen 105, for better attachment or combination, the radian of the inner layer frame 102 is similar to that of the arched filter screen 105, and the height h of the arched filter screen 105 in the direction perpendicular to the bottom layer frame 101 is preferably 2-60 mm.

FIG. 5e shows the embolic deflector deployed from the proximal ascending aorta to the distal descending aorta according to different aortic arch shapes, with the underlying frame 101 of the embolic deflector 10 positioned at the tangent to the center of the aortic arch to support the filter mesh 105; the inner layer frame 102 of the embolus diverter 10 is positioned on the upper wall of the aortic arch, firmly fixes the semi-spherical highest part of the filter screen 105 and seals three blood vessels on the aortic arch. Preventing thrombus from being flushed into three blood vessels on the aortic arch by the blood flow.

In this embodiment, the filter screen 105 is in an arch shape and has a fishing net structure. The filter screen 105 can be made of a sheet material with a certain mesh woven in advance by metal materials such as nickel-titanium wires and the like, high polymer materials or biocompatible materials such as inorganic nonmetal and the like, or can be made of an arched screen wire material woven in advance or shaped; the mesh material can also be made by processing a membrane material into a membrane and punching. The aperture of the filter screen 105 is preferably 30-250um, which can not only block thrombus from passing through, but also ensure that the blood flow velocity is not affected. Preferably, the open area of the mesh of the filter screen 105 occupies 40% to 70% of the entire area of the filter screen 105. In connection with fig. 5c, the height h of the apex of the arched curvature of the filter screen 105 is preferably 2-60 mm. Preferably, the perimeter of the bottom cross-section of the arched filter mesh is equal to the perimeter of the underlying frame 101, and further, the maximum arc length of the arched filter mesh may be arranged in the axial direction and equal to or greater than the axial length of the underlying frame 101 after it is retracted into the sheath.

In this embodiment, the diameter or width of the wave bars of the frame constituting the support frame may be 1.0mm to 0.2 mm; the diameter or width of the bottom layer frame wave bars may be the same as or different from the diameter or width of the inner layer frame wave bars. Further, the diameter or width of the bottom layer frame wave bars is larger than the diameter or width of the inner layer frame wave bars. The frame wave rod can be formed by laser engraving of biocompatible materials such as metal, high polymer or inorganic nonmetal and can also be formed by weaving or winding single-strand or multi-strand wires of the biocompatible materials such as metal, high polymer or inorganic nonmetal.

In one embodiment, the distal end of the push rod 20 is connected to the proximal end of the inner frame 102, and the push rod 20 is further connected to the bottom frame 101 through the first wire 201, specifically, the distal end of the first wire 201 is connected to the proximal end of the bottom frame 101, and the proximal end of the first wire 201 is connected to the push rod 20. The connection of push rod 20, inner frame 102, and bottom frame 101 has a certain orientation such that embolic deflector 10 is always maintained in the direction of the upper wall of the aortic arch when embolic deflector 10 is delivered to the aortic arch. By pushing and pulling on the proximal end of push rod 20, the entire embolic deflector 10 can be released or retracted within introducer sheath 30 or the guiding catheter.

In this embodiment, the pushing rod 20 may be stainless steel, nickel titanium, polymer tube or rod.

With reference to fig. 6, in this embodiment, the structure of the push rod 20 may be a uniform size structure, or may also be a diameter-variable structure, further, the outer diameter of the push rod 20 adopting the diameter-variable structure gradually increases from the distal end to the proximal end, preferably, the distal end of the push rod 20 is provided with a connection structure for connecting with the inner frame 102 of the tie rod steering gear 10, the connection structure may be a first hook 202, or may be a fixed structure in an embedded form, and correspondingly, the inner frame 102 is provided with a first ring connected with the first hook 202. The hinged connection between the pushing rod 20 and the inner frame 102 of the embolic steering device 10 allows the joint to rotate freely, and allows the pushing rod 20 and the inner frame 102 to move relatively, and the hinged connection is characterized in that the embolic steering device 10 can adapt to the curvature of the blood vessel freely after being released into the aortic arch, and is not affected by the change of the pushing rod 20.

Similarly, the distal end of the first silk thread 201 is also provided with a second hook or a fixing structure in an embedded manner, and correspondingly, the bottom layer frame 101 may be correspondingly provided with a second ring connected with the second hook, the distal end of the first silk thread 201 is connected with the proximal end of the bottom layer frame 101 in a hinge manner, and the proximal end of the first silk thread 201 is connected with the distal end of the push rod 20 in a fixed manner. Such a design helps to maintain the synchronization of both the push rod 20 and the embolic diverter 10, not only ensuring the freedom of the underlying frame 101, but also achieving a smoother in-and-out catheter performance, facilitating the free adjustment of the position and shape of the embolic diverter 10 in the aortic arch after release.

In another embodiment, push rod 20 is coupled to embolic deflector 10 such that push rod 20 extends to the distal-most end of inner frame 102 and push rod 20 is hingedly coupled to the distal end of inner frame 102. The connection mode of the bottom layer frame is unchanged. In yet another embodiment, push rod 20 is attached to embolic deflector 10 by extending push rod 20 to the distal-most end of inner frame 102 and hingedly attaching push rod 20 to the distal and proximal ends of inner frame 102. The underlying frame 101 is attached in a constant manner.

The push rod 20 provided by this embodiment may be a rod or a tube. Further, the pushing rod 20 may be pre-bent or patterned to improve the transportation or adherence of the embolic deflector 10. When there are multiple inner frames 102, the hinge points are arranged according to the tangent points of the push rod 20 and each inner frame, e.g., the push rod 20 may be connected with the outermost inner frame.

The push rod 20 preferably has an outer diameter of 0.5 to 1.5mm, and the first wire 201 preferably has an outer diameter of 0.1 to 0.5 mm.

In this embodiment, the support frame of embolic deflector 10 is further provided with different numbers and forms of visualization markers to facilitate visualization and positioning of embolic deflector 10 throughout the release and surgical procedure. The development mark point can be realized by winding a development wire on the support frame to form a development point, or can be formed by directly sleeving an annular or tubular development element on the support frame, or can be formed by manufacturing a nickel-titanium wire material with development performance into the support frame. The primary purpose of the visualization marker is to clearly identify the position and open/retracted state of the emboli diverter 10 during the procedure. Preferably, a visualization element is also provided at the distal end of the pusher rod 20 to facilitate the surgeon in confirming the position of the delivery, positioning, release, etc. of the embolic deflector and its delivery device during the surgical procedure. The material of the developing element can be noble metal such as tantalum, platinum, gold, tungsten and the like.

Further, the surface of the filter screen 105 of the embolus diverter 10 is covered with a coating, and the coating can be made of anti-coagulation medicines such as heparin and anticoagulant medicines, so as to prevent the filter screen 105 from being blocked due to thrombus accumulation in the operation process. The arrangement mode of the coating can be realized by adopting processes such as dip coating, spray coating and the like. In another embodiment, the filter screen 105 may also be made of a material with an anti-clotting drug.

Example 2

The present embodiment is substantially the same as the embodiment 1, and the difference is that:

the support frame of the embolus steering gear 10 is composed of a bottom layer frame 101 and a plurality of inner layer frames, the number of the inner layer frames is larger than or equal to 2, the inner layer frames and the bottom layer frame 101 are arranged in the same direction, the distance between the near end vertex and the far end vertex of the bottom layer frame is larger than the distance between the near end vertex and the far end vertex of the inner layer frame, and the distance between the near end vertex and the far end vertex of the inner layer frames gradually decreases along the direction far away from the bottom layer frame 101.

Example 3

The present embodiment is substantially the same as the embodiment 1, and the difference is that:

the embolus steering gear is of a double-layer ellipse-like structure in a naturally unfolded state, and third circular rings 103 are designed at two ends of an inner layer frame and a bottom layer frame of the embolus steering gear to serve as connection points, as shown in fig. 7, so that the inner layer frame and the bottom layer frame of the embolus steering gear are conveniently connected with a pushing rod and a first silk thread.

The push rod is connected to the distal end of the inner frame of the embolic deflector, and the distal end of the push rod is pre-bent to form a third hook, typically with an aortic arch radius of curvature. The push rod supports the highest point of the filter screen and penetrates through the whole inner layer framework, the design is more favorable for the filter screen to be attached to three blood vessels on the aortic arch wall, and the whole embolus steering gear can form a barrier space to cover the whole blood vessel wall above the radius of the aortic arch.

Example 4

The present embodiment is substantially the same as the embodiment 1, and the difference is that:

the support frame consists of only one layer of underlying frame. The bottom layer frame is preferably a planar structure or a three-dimensional structure with the width of the far end larger than or equal to the width of the near end. The periphery of the filter screen is connected with the bottom layer framework, and the filter screen is in a plane or non-plane structure.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement or improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (17)

1. The bolt steering gear is characterized by comprising a supporting frame and a filter screen;

the supporting frame comprises a bottom layer frame and at least one inner layer frame, the bottom layer frame and the at least one inner layer frame are arranged at intervals from low to high, and the distance between a near-end vertex and a far-end vertex of the bottom layer frame is greater than the distance between the near-end vertex and the far-end vertex of the inner layer frame;

the filter screen is arranged outside the support frame and forms an arch structure.

2. The embolic diverter of claim 1, wherein said bottom frame is attached to a perimeter of said filter screen, and said at least one inner frame is disposed between said bottom frame and a center point of said filter screen and attached to said filter screen.

3. The embolic deflector of claim 2, wherein said inner frames are plural in number, and wherein the distance between the proximal and distal apices of said plural inner frames decreases progressively in a direction away from said underlying frame.

4. The embolic deflector of claim 1, wherein said underlying frame is a planar structure and the distal width of said underlying frame is greater than or equal to the proximal width.

5. The embolic diverter of claim 1, wherein at least one of said inner frames is arcuate in configuration in a direction toward the upper wall of the aortic arch, and the distal width of said inner frame is greater than or equal to the proximal width.

6. The embolic deflector of claim 1, wherein said underlying frame has a distance between a proximal apex and a distal apex of 30-120mm, a distal width of 50-100mm, and a proximal width of 30-60 mm.

7. The embolic deflector of claim 1, wherein said inner frame has a distance between a proximal apex and a distal apex of 20-100mm, a distal width of 20-80mm, and a proximal width of 15-40 mm.

8. The embolic diverter of claim 1, wherein said filter mesh has a height in a direction perpendicular to said underlying frame of 2-60 mm.

9. The emboli diverter of claim 1 wherein the mesh size of the filter mesh is 30-250um and the mesh area of the filter mesh is 30% -80% of the total area of the filter mesh.

10. The embolic diverter of claim 1, wherein the surface of said filter mesh is covered with a coating of heparin or anti-clotting drug; or the filter screen is made of a material containing an anti-hemagglutination medicine.

11. A delivery device comprising the embolic diverter of any of claims 1-10, a push rod, and an introducer sheath, the embolic diverter coupled to the push rod, the embolic diverter compressed within the introducer sheath.

12. The delivery device of claim 11, wherein a distal end of the push rod is coupled to a proximal or distal end of an inner frame of the embolic deflector.

13. The delivery device of claim 11, further comprising a first wire, a distal end of the first wire being connected to a proximal end of an underlying frame of the embolic diverter, a proximal end of the first wire being connected to the push rod.

14. The delivery device of claim 11, wherein the push rod is of a tapered configuration with an outer diameter that increases from the distal end to the proximal end.

15. The delivery device of claim 12, wherein a distal end of the push rod is hingedly connected to a proximal or distal end of an inner frame of the embolic diverter; or the far end of the push rod is provided with a first hook, and the near end or the far end of the inner layer frame of the embolus steering gear is provided with a first ring connected with the first hook.

16. The delivery device of claim 13, wherein a distal end of the first wire is hingedly connected to a proximal end of a bottom frame of the embolic deflector; or the far end of the first silk thread is provided with a second hook, and the near end of the bottom layer frame of the embolus steering gear is provided with a second ring connected with the second hook.

17. The delivery device of claim 11, wherein a distal end of the pusher rod is provided with a visualization element.

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