CN115957059A - Vascular stent delivery system - Google Patents

Abstract

The application relates to a blood vessel stent conveying system which comprises a blood vessel stent and a conveyor. The intravascular stent comprises a plurality of wave rings which are sequentially arranged and connecting rods which are connected with the adjacent wave rings, each wave ring comprises a plurality of wave crests and wave troughs which are arranged at intervals, and except the wave rings at the two ends, each wave crest and each wave trough are connected with the adjacent wave rings through one connecting rod. The conveyor comprises a conveying rod and a core wire penetrating through the conveying rod, the blood vessel support is sleeved on the conveying rod, and after the conveying rod and the core wire are electrified, part of the connecting rod is subjected to electric corrosion and is broken. The vascular stent delivery system can be recovered in the release process, and can also improve the adhesion with the vascular wall after release.

Description

Vascular stent delivery system

Technical Field

The invention relates to the technical field of medical instruments, in particular to a vascular stent conveying system.

Background

This section provides background information related to the present disclosure only and is not necessarily prior art.

Intracranial aneurysms are abnormal protrusions that occur on the wall of the intracranial arterial blood vessel and are the leading cause of subarachnoid hemorrhage. After rupture of the aneurysm and hemorrhage, the brain tissue can be damaged, and cerebral vasospasm can also be caused, which mostly occurs 3-14 days after subarachnoid hemorrhage. The blood clots irritate the walls of the blood vessels, causing strong constriction of the blood vessels, which may lead to ischemic necrosis, coma and hemiplegia in the brain tissue. Intracranial aneurysm may occur in congenital dysplasia of arteries, infection, arteriosclerosis, craniocerebral trauma and the like, and the clinical manifestations of the intracranial aneurysm are headache and nausea, and the intracranial aneurysm is usually treated by an operation mode. Currently, interventional therapy and surgical craniotomy clamping are the two main surgical approaches to intracranial aneurysms. The interventional therapy is to release a metal spring ring made of special alloy material from artery into aneurysm, so as to cause thrombus in the cavity, achieve the purpose of embolizing the aneurysm, relieve the blood flow impact pressure on the aneurysm wall and achieve the hemostatic effect. However, the coil has low stability, resulting in poor surgical performance.

The stent-assisted spring coil embolization technology is an important technology in intracranial aneurysm interventional embolization. With the assistance of the stent, the intracranial wide-neck, micro and fusiform aneurysm which cannot be subjected to compact embolism or even cannot be subjected to embolism can obtain a good treatment effect, the embolism proportion is increased, the recurrence of the aneurysm is prevented, and the healing is promoted.

The stent mainly plays the following roles: 1. protecting the parent artery, so that the spring ring can be well filled in the aneurysm, and preventing postoperative cerebral infarction caused by stenosis and occlusion of the parent artery; 2. the density of the embolism in the neck of the tumor is increased, and due to the blocking of the stent, the spring ring can completely cover the neck of the tumor according to the plastic of the shape of the artery of the tumor, thereby promoting the thrombopoiesis and healing; 3. the shape of the parent artery is changed, the blood flow is guided, the blood flow is reduced to enter the aneurysm, and the healing is promoted; 4. stimulating the growth of angiogenesis endothelium and promoting the healing of aneurysm.

The existing auxiliary stent products are divided into open-loop stents and closed-loop stents according to mesh design, wherein the open-loop stents have good flexibility and compliance, and the adherence is good. So if the diseased vessel is highly tortuous, an open loop stent is used for assistance. However, an accepted disadvantage of open loop stents is that they cannot be retrieved after release, and if the stent is not placed in the correct position during the operation, a second stent needs to be placed, which not only increases the cost of the operation, but also increases the operation time and the operation risk. Moreover, the placement of multiple stents at the lesion site may cause multiple stenoses and increase the psychological stress of the patient.

Disclosure of Invention

The present invention has been made to solve at least one of the above-mentioned problems. The purpose is realized by the following technical scheme:

embodiments of the present application provide a vascular stent delivery system, comprising:

the vascular stent comprises a plurality of wave rings which are sequentially arranged and connecting rods which are connected with the adjacent wave rings, wherein each wave ring comprises a plurality of wave crests and wave troughs which are arranged at intervals, and except the wave rings at the two ends, each wave crest and each wave trough are connected with the adjacent wave rings through one connecting rod; and

the blood vessel support is sleeved on the conveying rod, and after the conveying rod and the core wire are electrified, part of the connecting rod is subjected to electric corrosion and is broken.

According to this application embodiment's blood vessel support conveying system, because blood vessel support all connects through the connecting rod at crest and trough before the release and forms a closed loop support, can realize retrieving in the release process, can avoid blood vessel support to place at wrong position, when blood vessel support confirms release position, through with carrying the pole with the core silk circular telegram after, blood vessel support's partial connecting rod can take place the galvanic corrosion and break, make blood vessel support become the open loop structure by closed loop structure, can improve the laminating nature with the vascular wall after the release of blood vessel support.

In addition, the blood vessel stent delivery system according to the embodiment of the invention can also have the following additional technical characteristics:

in one embodiment, the wave ring and a part of the connecting rod are provided with a coating, at least a part of the connecting rod is not provided with the coating, and after the conveying rod is electrified with the core wire, the connecting rod which is not provided with the coating is subjected to electric corrosion and is broken.

In one embodiment, the connecting rods comprise first connecting rods and second connecting rods, the width of each first connecting rod is larger than that of each second connecting rod, at least one first connecting rod is connected between every two adjacent wave rings, the first connecting rods are provided with the coatings, and the second connecting rods are not provided with the coatings.

In one embodiment, the conveyor further comprises a first developing ring and a second developing ring which are arranged on the core wire, the proximal end of the vascular stent is provided with a clamping block, and the clamping block is clamped between the first developing ring and the second developing ring and is abutted against the first developing ring.

In one embodiment, the first developing ring is electrically connected with the core wire, and the first developing ring is connected with the conveying rod in an insulating mode.

In one embodiment, the conveyor further includes a connecting wire, the first developing ring is provided with a through hole, the connecting wire penetrates through the through hole, the connecting wire is insulated from the first developing ring, and two ends of the connecting wire are respectively electrically connected with the conveying rod.

In one embodiment, the first developing ring is connected with the core wire in an insulating mode, and the first developing ring is electrically connected with the conveying rod.

In one embodiment, the second developing ring is connected with the core wire in an insulated mode, and the second developing ring is connected with the conveying rod in an insulated mode.

In one embodiment, the conveyor further comprises a metal base arranged at the proximal end of the conveying rod, the core wire is fixedly connected with the proximal end of the conveying rod through the metal base, the conveying rod is connected with the metal base in an insulation manner, and the proximal end of the core wire is electrically connected with the metal base.

In one embodiment, the blood vessel stent further comprises an introducer sheath, wherein the introducer sheath comprises a lumen, the delivery rod is arranged in the lumen in a penetrating way, and the blood vessel stent is sleeved on the delivery rod and is positioned in the lumen.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:

FIG. 1 is a schematic structural diagram of a stent delivery system according to an embodiment of the present invention;

FIG. 2 is a schematic structural view of the vascular stent shown in FIG. 1;

FIG. 3 is an expanded view of the vascular stent shown in FIG. 2;

FIG. 4 is an enlarged view of FIG. 3 at A;

FIG. 5 is a schematic view of the conveyor shown in FIG. 1;

FIG. 6 is a schematic view of a portion of the conveyor shown in FIG. 5;

FIG. 7 is a schematic structural view of the first developer ring shown in FIG. 6;

FIG. 8 is a schematic view of the partially released stent system of FIG. 1 within a microcatheter;

FIG. 9 is a schematic structural view of the vascular stent after intravascular release;

FIG. 10 is a schematic structural view of a stent delivery system according to a second embodiment of the present application;

FIG. 11 is a schematic view of the conveyor shown in FIG. 10;

fig. 12 is a schematic view showing a structure of partial release of the stent delivery system of fig. 10 in a microcatheter.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" may be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof.

Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.

For convenience of description, spatially relative terms, such as "inner", "outer", "lower", "below", "upper", "above", and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the example term "below … …" may include both an up and down orientation. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

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 invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

It should be noted that, in the present application, a range expressed by "one numerical value to another numerical value" is a general expression for avoiding that all numerical values in the range are enumerated in the specification. Thus, recitation of a range of values herein is intended to encompass any value within the range and any smaller range defined by any value within the range, as if the range and smaller range were explicitly recited in the specification.

In the present application, the end closer to the operator in use is referred to as the "proximal end", the end farther from the operator is referred to as the "distal end", and the "proximal end" and the "distal end" of any component of the stent delivery system are defined according to this principle. "axial" generally refers to the length of the stent as it is delivered, and "radial" generally refers to the direction of the stent perpendicular to its "axial" direction, and defines both "axial" and "radial" directions for any component of the stent in accordance with this principle.

Referring to fig. 1, a stent delivery system 10 according to a first embodiment of the present application includes a stent 100 and a transporter 200, the stent 100 is sleeved on the transporter 200, and the transporter 200 is used for delivering the stent 100 to a lesion site.

Referring to fig. 2 to 4, the blood vessel stent 100 includes a plurality of wave rings 110 sequentially arranged and a connecting rod 120 connecting adjacent wave rings 110, the wave ring 110 includes a plurality of wave crests 111 and wave troughs 112 arranged at intervals, except for the wave rings 110 at both ends, each wave crest 111 and wave trough 112 is connected with adjacent wave rings 110 through a connecting rod 120, so that the blood vessel stent 100 forms a plurality of closed mesh structures. In the illustrated embodiment, the adjacent wave rings 110 are symmetrically distributed about the center line of the two wave rings 110, between two adjacent wave rings 110, the wave trough 112 of one wave ring 110 is disposed opposite to the wave crest 111 of the other wave ring 110, and a connecting rod 120 is connected between the wave crest 111 and the wave trough 112 to form a diamond-like grid. Of course, in other embodiments, the vessel stent 100 may have other structures as long as it is ensured that there are no free peaks 111 and/or valleys 112 on other wave rings 110 except for the wave rings at the two ends, i.e. all peaks 111 and valleys 112 on other wave rings 110 are connected by the connecting rods 120. When the stent 100 is configured to be energized, a portion of the connecting rods 120 are electrically corroded and broken to release a portion of the free peaks 111 and/or valleys 112.

In one embodiment, the vessel stent 100 can be made by laser engraving a metal tube, and the wall thickness of the vessel stent 100 ranges from 0.04mm to 0.06mm. The material of the stent 100 may be an alloy having shape memory and super elasticity, such as nitinol, cobalt-chromium alloy, etc.

In one embodiment, the wave ring 110 and a portion of the connecting rod 120 are coated, and at least a portion of the connecting rod 120 is not coated, so that when the vascular stent 100 is energized, the connecting rod 120 without the coating is electrically corroded and broken. In one embodiment, the coating may be parylene, or the like.

Referring to fig. 3 and 4, the connecting rod 120 includes a first connecting rod 121 and a second connecting rod 122, the width of the first connecting rod 121 is greater than the width of the second connecting rod 122, at least one first connecting rod 121 is connected between two adjacent wave rings 110, the first connecting rod 121 is coated, and the second connecting rod 122 is not coated. In one embodiment, the width of the wave ring 110 ranges from 0.05mm to 0.1mm, the width of the first connecting rod 121 ranges from 0.05mm to 0.1mm, and the width of the second connecting rod 122 ranges from 0.02mm to 0.04mm. In an embodiment, the first connection bars 121 and the second connection bars 122 are arranged at intervals, for example, one first connection bar 121 is arranged every two second connection bars 122, and when the second connection bars 122 are broken by electrical corrosion, the first connection bars 121 can maintain the connection of the entire wave ring 110. Referring to fig. 4, the first connecting rod 121 is wound with a developing filament 125, such as Huang Jinsi, for observing the adherence of the stent 100 in the blood vessel after release.

With continued reference to fig. 2, the proximal and distal ends of the stent 100 are expanded outwardly such that the proximal and distal ends have a diameter greater than the diameter of the central section, thereby increasing the stability of the stent 100 after release. In one embodiment, the angle between the proximal and distal ends of the stent 100 and the central axis of the stent 100 is in the range of 20-50 °, and the diameter of the middle section of the stent 100 is 3-6 mm in the expanded state.

Referring to fig. 1 and fig. 2, the proximal end of the blood vessel stent 100 is provided with a clamping block 130, and the blood vessel stent 100 is fixed on the conveyor 200 by the clamping block 130. Specifically, the proximal end of the blood vessel stent 100 is provided with 3 engaging blocks 130,3 engaging blocks 130 which are evenly distributed along the circumference of the blood vessel stent 100. In an embodiment, the engaging block 130 includes a supporting rod 131 formed by extending the proximal end of the blood vessel stent 100 and a developing sheet 132 disposed on the supporting rod 131, and the developing sheet 132 may be fixed on the supporting rod 131 by welding or riveting. Specifically, the proximal wave ring 110 of the blood vessel stent 100 is connected to 3 support rods 131, so that the blood vessel stent 100 can be conveniently recycled. In the embodiment shown in fig. 3, several of the wave rings 110 near the proximal end may be discontinuous and connected by a plurality of connecting rods 120 to form 3 triangular structures. In one embodiment, the support rods 131 are integrally carved with other structures of the vessel stent 100. The developing sheet 132 may be made of platinum, tantalum, platinum tungsten, platinum iridium, or the like, and may facilitate observation of the expanded state of the vascular stent 100. In one embodiment, the distal end of the stent 100 is also provided with a visualization structure 140 to facilitate viewing of the stent's distal end after deployment. The developing structure 140 may have the same structure as the proximal engaging block 130, and also includes a supporting rod and a developing sheet disposed on the supporting rod.

Referring to fig. 5, the conveyor 200 includes a conveying rod 210 and a core wire 220 inserted into the conveying rod 210, and the core wire 220 is insulated from the conveying rod. The delivery rod 210 is a hollow structure, and the radial dimension of the delivery rod 210 gradually decreases from the proximal end to the distal end. The delivery rod 210 includes a proximal portion 211 and a distal portion 212, the proximal portion 211 having a hardness greater than the distal portion 212, and the proximal portion 211 and the distal portion 212 being fixedly connected together, for example, by welding. In one embodiment, proximal portion 211 is a hollow tube structure, distal portion 212 is a spring structure, and distal portion 212 has a length that is 1/5 to 1/3 of the overall length of delivery rod 210.

With continued reference to fig. 5, the conveyor 210 further includes a metal base 250 disposed at the proximal end of the conveying rod 210, the proximal end of the core wire 220 is fixedly connected to the conveying rod 210 through the metal base 250, the proximal end of the conveying rod 210 is connected to the metal base 250 in an insulated manner, and the proximal end of the core wire 220 is electrically connected to the metal base 250. In the illustrated embodiment, the metal base 250 is sleeved on the proximal end of the conveying rod 210 and is fixedly connected by the insulating glue, and the proximal end of the core wire 220 is fixedly connected with the metal base 250 by welding, so as to realize the electrical connection between the core wire 220 and the metal base 250.

The outer surface of the proximal end portion 211 of the delivery rod 210 is provided with an insulating coating 213, the insulating coating 213 may be a teflon coating, and the insulating coating 213 may be smoother when the delivery rod 210 is pushed. The position of the transmission rod 210 near the metal base 250 is exposed, i.e. not provided with the insulating coating 213, and the exposed position is used for connecting with the electrode of the power supply, for example, the exposed length from the far end of the metal base 250 to the far end of the transmission rod 210 is about 3 cm.

The core wire 220 is positioned within the lumen of the delivery rod 210, and the core wire 220 extends from the proximal end of the delivery rod 210 to the distal end of the delivery rod 210 and is secured to the distal end of the delivery rod 210, such as by welding or adhesive bonding. The surface of the core wire 220 is provided with an insulating layer 221, such as teflon, to achieve insulation from the inner wall of the feed rod 210.

With reference to fig. 1 and fig. 5, the conveyor 200 further includes a first developing ring 230 and a second developing ring 240 disposed on the core wire 220, and the engaging block 130 of the blood vessel stent 100 is disposed between the first developing ring 230 and the second developing ring 240 and abuts against the first developing ring 230. The first developer ring 230 and the second developer ring 240 are located at the distal end portion 212 of the conveying rod 210, and the spring structure of the distal end portion 212 is not continuous and is interrupted by the first developer ring 230 and the second developer ring 240. In one embodiment, the first developer ring 230 and the second developer ring 240 are both ring-shaped structures, which are disposed on the core wire 220 and are fixedly connected to the spring structure of the distal portion 212. The first and second developing rings 230 and 240 are each a metallic material having developability, such as platinum, tantalum, platinum iridium, platinum tungsten, or the like.

The first developing ring 230 is electrically connected to the core wire 220, and the first developing ring 230 is connected to the feeding rod 210 in an insulating manner. Referring to fig. 6, the first developing ring 230 is connected to the core wire 220 by soldering, and the insulating layer 221 at the connection position of the first developing ring 230 and the core wire 220 is removed by the temperature generated during soldering, so that the first developing ring 230 is electrically connected to the core wire. The first developer ring 230 is fixedly attached to the feed rod 210 by an insulating glue, and in the illustrated embodiment, the first developer ring 230 is attached to the spring structure with the distal portion 212 spaced apart by the insulating glue. Referring to fig. 5 and 7, the first developing ring 230 is provided with a through hole 231, the conveyor 200 further includes a connecting wire 260, the connecting wire 260 penetrates through the through hole 231, the connecting wire 260 is connected to the first developing ring 230 in an insulated manner, and two ends of the connecting wire 260 are electrically connected to the conveying rod 210 respectively, so that the spring structure separated by the first developing ring 230 can be electrically connected. In the illustrated embodiment, the region of the connection wire 260 within the through hole 231 is sheathed with a heat shrinkage tube 261 to insulate the connection wire 260 from the first developing ring 230. The material of the connection wire 260 may be graphene, gold, silver, copper, or the like.

The second developing ring 240 is connected to the core wire 220 in an insulated manner, and the second developing ring 240 is also connected to the feeding rod 210 in an insulated manner. In the illustrated embodiment, the second developing ring 240 is fitted over the core wire 220 and is connected to the feeding rod 210 by an insulating glue.

Referring to fig. 1, the blood vessel stent delivery system 10 further includes a guiding sheath 300, the guiding sheath 300 includes an inner cavity, the delivery rod 210 is disposed through the inner cavity, the blood vessel stent 100 is sleeved on the delivery rod 210 and located in the inner cavity, and the engaging block 130 abuts against the first developing ring 240.

The inner diameter of the lumen of the introducer sheath 300 remains constant from the distal end to the proximal end. The inner diameter of the introducer sheath 300 is larger than the outer diameter of the delivery rod 210 so that the delivery rod 210 can move from the proximal end to the distal end within the lumen of the introducer sheath 300 to advance the stent 100. The material of the introducer sheath 300 is a polymer material, and polytetrafluoroethylene is provided in the inner layer of the introducer sheath 300 for lubrication. The inner diameter of the introducer sheath 300 includes 0.017in, 0.021in, 0.027in, etc. dimensions, and the port of the introducer sheath 300 is tapered.

The present application further provides a method of operating a vascular stent delivery system 10, comprising the steps of:

s11: the blood vessel stent 100 is sleeved on the conveying rod 210, the clamping block 130 at the proximal end of the blood vessel stent 100 is clamped between the first developing ring 230 and the second developing ring 240 and is abutted against the first developing ring 230, the blood vessel stent 100 is loaded in the guide sheath 300, and at the moment, the blood vessel stent 100 is in a compressed state.

S12: the microcatheter 400 is delivered to the lesion (e.g. aneurysm), the introducer sheath 300 is connected to the proximal end of the microcatheter 400, the delivery rod 210 is pushed distally, and after the target position is reached, the second visualization ring 240 is gradually pushed out of the distal end face of the microcatheter 400, the stent 100 is partially pushed out of the microcatheter 400 and self-expands to be expanded, and the first visualization ring 230 is still in the microcatheter. It should be noted that, when the second developing ring 240 is not pushed out of the distal end face of the microcatheter 400, the blood vessel stent 100 can be recovered into the microcatheter 400 again, so as to recover the blood vessel stent 100.

S13: referring to fig. 8, after the release position of the blood vessel stent 100 is determined, the metal base 250 is connected to the positive pole of the power supply, the exposed position of the proximal end of the delivery rod 210 is connected to the negative pole of the power supply, and a direct current is introduced, so that a complete current loop can be formed, and the direction of the current loop is as follows: the positive pole → the metal base 250 → the core wire 220 → the first developing ring 230 → the blood vessel stent 100 → blood → the part of the delivery rod 210 between the first developing ring 230 and the second developing ring 240 → the connecting wire 260 → the part of the delivery rod 210 located at the proximal end of the first developing ring → the negative pole, when the blood vessel stent 100 is electrified, part of the connecting rod 120 of the blood vessel stent 100 is electrically corroded and broken, so that the blood vessel stent 100 is changed from a closed loop structure to an open loop structure. In this embodiment, the second connecting rod 122 without the coating layer may be electrically corroded and broken to form the open loop structure of the vascular stent 100.

In one embodiment, the voltage of the power supply is in the range of 9-12V and the current is set to 5mA. In rapidly circulating blood, a weak current does not produce a thrombus.

S14: the delivery rod 210 is pushed further to push the first visualization ring 230 out of the microcatheter, at which point the stent 100 is fully deployed within the vessel. As a part of the connecting rods 120 of the blood vessel stent 100 is broken, the blood vessel stent 100 changes from a closed loop structure to an open loop structure, please refer to fig. 9, after the blood vessel stent 100 is completely released, it can better fit and bend the blood vessel.

Above-mentioned blood vessel support conveying system 10, because blood vessel support 100 is all connected through connecting rod 120 at crest 111 and trough 112 before the release and forms a closed loop support, can realize retrieving in the release process, can avoid blood vessel support 100 to be placed at the wrong position, when blood vessel support 100 confirms release position, through with the delivery rod 210 with the core wire 220 circular telegram back, blood vessel support 110's partial connecting rod 120 can take place the galvanic corrosion and the fracture, make blood vessel support 100 become the open loop structure by closed loop structure, can improve the laminating nature with the vascular wall after blood vessel support 100 releases.

Referring to fig. 10 and 11, a second embodiment of the present invention of a stent delivery system 10a has substantially the same structure as the first embodiment of the stent delivery system 10, but differs therefrom mainly in that: the first developing ring 230a of the conveyer 200a is connected to the core wire 220a and the conveying rod 210a in a different manner. The delivery unit 200a of the blood vessel stent delivery system 10a of embodiment 2 is not provided with the connecting wire 260 of embodiment 1.

Referring to fig. 11, the first developing ring 230a is electrically connected to the feeding rod 210a, and the first developing ring 230a is insulated from the core wire 220 a. In one embodiment, the first developing ring 230a is sleeved on the core wire 220a, and the insulating layer on the core wire 220a is remained and is fixedly connected by being welded to two ends of the conveying rod 210a, and the conveying rod 210a is kept in electrical communication through the first developing ring 230 a. Of course, in other embodiments, the first developing ring 230a may also be directly sleeved on the conveying rod 210a, and the conveying rod 210a may not be required to be separated.

The second developing ring 240a is connected to the core wire 220a in an insulated manner, and the second developing ring 240a is also connected to the feeding rod 210a in an insulated manner. In the illustrated embodiment, the second developing ring 240a is fitted over the core wire 220a and is connected to the feeding rod 210a by insulating glue.

Unlike embodiment 1, in this embodiment, the metal base 250a is used to connect to the negative pole of the power source, and the exposed position of the conveying rod 210a near the metal base 250a is used to connect to the positive pole of the power source.

The operation method of the blood vessel stent conveying system 10a in the embodiment comprises the following steps:

s21: the vascular stent 100a is sleeved on the delivery rod 210a, the clamping block 130 at the proximal end of the vascular stent 100 is clamped between the first developing ring 230a and the second developing ring 240a and is abutted against the first developing ring 230a, and the vascular stent 100 is loaded in the guide sheath 300, at this time, the vascular stent 100a is in a compressed state.

S22: the microcatheter 400 is delivered to the lesion (e.g. aneurysm), the introducer sheath 300 is connected to the proximal end of the microcatheter 400, the delivery rod 210a is pushed distally, and after the target position is reached, the second visualization ring 240a is gradually pushed out of the distal end face of the microcatheter 400, the stent 100 is partially pushed out of the microcatheter and self-expands to expand, and the first visualization ring 230a is still in the microcatheter 400. It should be noted that when the second developing ring 240a is not pushed out of the distal end surface of the microcatheter 400a, the stent 100 can be recovered into the microcatheter 400 again, so as to recover the stent 100.

S23: referring to fig. 12, after the release position of the blood vessel stent 100 is determined, the exposed position of the conveying rod 210a close to the metal base 250a is connected to the positive pole of the power supply, the metal base 250a of the conveyor 200a is connected to the negative pole of the power supply, and direct current is introduced, so that a complete current loop can be formed, and the direction of the current loop is as follows: the positive pole → the portion of the delivery rod 210a located at the proximal end of the first visualization ring 230a → the stent 100a → blood → the portion of the delivery rod 210a located at the distal end of the second visualization ring 240a → the core wire 220a → the metal base 250a → the negative pole, when the stent 100 is energized, a portion of the connecting rod 120 of the stent 100 is electrically corroded and broken, so that the stent 100 changes from a closed loop structure to an open loop structure. In this embodiment, the second connecting rod 122 without the coating layer may be electrically corroded and broken to form the open loop structure of the vascular stent 100.

S24: the delivery rod 210a is further pushed to push the first development ring 230a out of the microcatheter 400, and the stent 100 is completely deployed in the blood vessel.

All possible combinations of the technical features of the above embodiments may not be described for the sake of brevity, but should be considered as within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. A vascular stent delivery system, comprising:

the vascular stent comprises a plurality of wave rings which are sequentially arranged and connecting rods which are connected with the adjacent wave rings, wherein each wave ring comprises a plurality of wave crests and wave troughs which are arranged at intervals, and except the wave rings at the two ends, each wave crest and each wave trough are connected with the adjacent wave rings through one connecting rod; and

the blood vessel support is sleeved on the conveying rod, and after the conveying rod and the core wire are electrified, part of the connecting rod is subjected to electric corrosion and is broken.

2. The stent delivery system according to claim 1, wherein the wave ring and a portion of the connecting rods are provided with a coating, at least a portion of the connecting rods are not provided with the coating, and after the delivery rod is electrified with the core wire, the connecting rods not provided with the coating are corroded electrically and broken.

3. The stent delivery system according to claim 2, wherein the connecting rods comprise first connecting rods and second connecting rods, the width of the first connecting rods is greater than the width of the second connecting rods, at least one first connecting rod is connected between two adjacent wave rings, the first connecting rods are provided with the coating, and the second connecting rods are not provided with the coating.

4. The system of claim 1, wherein the conveyor further comprises a first developing ring and a second developing ring disposed on the core wire, and the proximal end of the stent is provided with a snap-fit block, and the snap-fit block is snapped between the first developing ring and the second developing ring and abuts against the first developing ring.

5. The vascular stent delivery system of claim 4, wherein the first visualization ring is electrically connected to the core wire and the first visualization ring is in insulated connection with the delivery rod.

6. The blood vessel stent conveying system according to claim 5, wherein the conveyor further comprises a connecting wire, a through hole is formed in the first developing ring, the connecting wire penetrates through the through hole, the connecting wire is insulated from the first developing ring, and two ends of the connecting wire are electrically connected with the conveying rod respectively.

7. The vascular stent delivery system of claim 4, wherein the first visualization ring is in insulated connection with the core wire and the first visualization ring is in electrical connection with the delivery rod.

8. The stent delivery system according to any of claims 5-7, wherein the second visualization ring is in insulated connection with the core wire and the second visualization ring is in insulated connection with the delivery rod.

9. The vessel stent conveying system according to claim 1, wherein the conveyor further comprises a metal base disposed at a proximal end of the conveying rod, the core wire is fixedly connected with the proximal end of the conveying rod through the metal base, the conveying rod is connected with the metal base in an insulating manner, and the proximal end of the core wire is electrically connected with the metal base.

10. The stent delivery system according to claim 1, further comprising an introducer sheath, wherein the introducer sheath comprises a lumen, the delivery rod is disposed through the lumen, and the stent is sleeved on the delivery rod and positioned in the lumen.

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