CN216933342U - Braided stent and braided stent system - Google Patents

Abstract

The utility model provides a braided stent and a braided stent system, wherein the braided stent is in a tubular braided mesh structure and has an expansion state and a compression state; the woven support comprises at least one first rib and at least one first developing piece, wherein the first rib is composed of at least two silk materials, and the first developing piece is arranged on at least one first rib. The braided stent of the braided stent system is braided by adopting two or more wires partially or completely containing developing materials, and the developing property of the braided stent can be improved under the condition of a smaller proportion of developing weaving head number to non-developing weaving head number, namely under the condition of not influencing the radial supporting force of the braided stent, the stent opening and the like.

Description

Braided stent and braided stent system

Technical Field

The utility model relates to the technical field of medical instruments, in particular to a braided stent and a braided stent system.

Background

Intracranial aneurysms are mostly abnormal bulges on the wall of an intracranial artery, are the first causes of subarachnoid hemorrhage, and are second only to cerebral thrombosis and hypertensive cerebral hemorrhage in cerebrovascular diseases and are the third cause. For some complicated aneurysms (such as large aneurysms, wide-neck aneurysms, fusiform and sandwich aneurysms and the like), intravascular braided stents are mostly adopted for treatment, the braided stents are utilized to interfere blood flow entering the aneurysms from parent arteries, so that blood in the aneurysms is blocked and deposited, thrombosis in the aneurysms is caused, and the aneurysms is further promoted to be completely blocked, and the braided stents can form a 'scaffold' for climbing and growing vascular endothelial cells, so that the endothelialization of the neck and the mouth of the aneurysm can be promoted, and the aneurysm is prevented from being broken.

In the existing woven stent for treating aneurysm, development is required to be arranged on the stent to help a doctor judge the position of the stent, the opening and the wall adhesion of the stent, so that risks of thrombus in the stent, injury of the stent to blood vessels and the like are avoided; in addition, the stent release is inaccurate due to the fact that the braided stent has stent shortening, and many doctors require that the stent has developing points which can help the doctors to judge the stent release ratio. Because a common nontransmissive material has poor resilience, is easy to deform under stress and low elastic modulus, the existing woven stent is generally woven by nickel-titanium or cobalt-based alloy wires, but the nickel-titanium or cobalt-based alloy wires have relatively poor developability, so the stent on the market is formed by co-weaving the nickel-titanium or cobalt-based alloy wires and developing materials such as platinum tungsten wires, platinum iridium wires, tantalum wires and the like, namely, the developing performance is usually realized by co-weaving the nickel-titanium or cobalt-based alloy wires and materials of transmission lines during weaving and the like. Or the developing points which are not transmitted are spliced on the head end or the tail end of the bracket. However, in a tortuous blood vessel, a doctor can hardly judge whether the stent is opened and adheres well through a few nontransmissive braided wires; and the current braided stent helps doctors to judge the stent release ratio by arranging the developing points on the pushing rod, so that the judging mode is still inaccurate, even the pushing rod and the stent are relatively displaced, the stent release ratio cannot be judged, and great inconvenience is brought to the operation of the doctors. Meanwhile, in order to achieve the effect of blood flow guiding, the wire diameter of the woven wire is very small, generally between 15 and 60 microns, so that the effect of high mesh density under low metal coverage is achieved. However, even if the developing wires are co-woven, it is difficult to balance the relationship between the radial supporting force of the stent, the stent opening, and the developing performance.

It is noted that the information disclosed in the above background section is only for enhancement of understanding of the background of the utility model and therefore it may contain information that does not form the prior art that is already known to a person of ordinary skill in the art.

SUMMERY OF THE UTILITY MODEL

In view of the problems in the prior art, an object of the present invention is to provide a braided stent and a braided stent system, in which the braided stent is braided by using two or more wires partially or entirely containing a developing material, and the developability of the braided stent is improved without affecting the radial supporting force of the braided stent, the stent opening, and the like.

A first aspect of the present invention provides a braided stent, wherein the braided stent is a tubular braided mesh structure and has an expanded state and a compressed state;

the woven support comprises at least one first rib and at least one first developing piece, wherein the first rib is composed of at least two silk materials, and the first developing piece is arranged on at least one first rib.

According to a first aspect of the utility model, said first rib is formed by parallel braiding, spiral winding or cross braiding of at least two wires.

According to a first aspect of the utility model, the material of the wire is a combination of one or more of nickel titanium alloy, cobalt chromium alloy and platinum alloy.

According to a first aspect of the utility model, the wire has a radial dimension of between 15um and 150 um.

According to a first aspect of the utility model, the braided stent further comprises at least one second rib, the second rib consisting of at least one wire; the braided stent is braided by the first and second ribs to form the tubular braided mesh structure.

According to the first aspect of the present invention, the ratio of the number of the first ribs to the number of the second ribs is K, and satisfies: k is more than 0 and less than or equal to 1.

According to an embodiment of the present invention, the first developing member has a spiral structure in which a developing wire is wound;

the developing wires are wound on the outer surface of the first rib, or the developing wires are wound on the at least two wires of the first rib in a crossed mode.

According to a first aspect of the utility model, at least one end of the developer wire is clamped between the at least two wires of the first rib.

According to the first aspect of the present invention, the first developing member is a circular ring member or a cylindrical member, and the circular ring member or the cylindrical member is sleeved on the outer surface of the first rib.

According to the first aspect of the present invention, the first developing member is made of one or a combination of more of platinum iridium alloy, platinum nickel alloy, platinum tungsten alloy, tungsten, tantalum, and gold.

According to a first aspect of the present invention, the woven stent includes a plurality of the first developing members arranged in a line in an axial direction of the woven stent when the woven stent is in a compressed state.

A second aspect of the utility model provides a braided stent system comprising a delivery sheath, a push guidewire and the braided stent; the braided stent is loaded on the distal end of the push guide wire, and the delivery sheath is used for accommodating the push guide wire and the braided stent.

According to the second aspect of the present invention, a second developing member and/or a third developing member is disposed on the pushing guide wire, and the second developing member and/or the third developing member is in a ring structure or a spring structure;

the second developer is disposed on the push guidewire on a proximal side of the braided stent;

the third developing part is arranged at the distal end of the pushing guide wire.

The utility model discloses utility model discloses a weave support of support system of the utility model adopts two roots or many parts or all contain the silk material of development material to weave and form, can weave under the condition of the proportion of first number of non-development weaving in developing less, improve the development nature of weaving the support under the condition such as not influencing weaving support radial bracing power, support and open promptly.

Meanwhile, the woven support is provided with the developing piece through the ribs woven by the two or more wires, in some embodiments, the developing piece is wound on the two or more wires of the ribs, so that the interaction force between the developing piece and the ribs can be improved, and the phenomenon that the doctor opens the judgment of the release ratio on the support due to slippage and displacement of the developing piece caused by factors such as push resistance is prevented.

In addition, development points can be arranged at any position of the woven stent according to actual needs, and when the number of the development points is two or more, the development points are in a line when the stent is in a compressed state. On one hand, the pushing resistance increased by the increase of the metal content of the unit cross-sectional area of the stent in a compressed state due to the increase of the developing points can be reduced, and on the other hand, the visible range (namely the visible length) of the developing points of the stent in the compressed state can be enlarged, so that a doctor can judge the position of the stent and the release ratio of the stent more favorably, and the success rate of the operation is improved.

Drawings

Other features, objects, and advantages of the utility model will be apparent from the following detailed description of non-limiting embodiments, which proceeds with reference to the accompanying drawings and which is incorporated in and constitutes a part of this specification, illustrating embodiments consistent with the present application and together with the description serve to explain the principles of the application. It is obvious that the drawings in the following description are only some embodiments of the utility model, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.

Fig. 1 is a schematic structural view of a woven stent according to an embodiment of the present invention;

fig. 2 is a schematic structural view of a first developing member of the first embodiment of the present invention;

fig. 3 is a schematic structural view of a first developing member of a second embodiment of the present invention;

fig. 4 is a schematic structural view of a first developing member of a third embodiment of the present invention;

fig. 5 is a schematic structural view of a braided stent system according to an embodiment of the utility model.

Reference numerals are as follows:

11 conveying pipe sheath

12 pushing guide wire

121 straight section

122 transition section

1221 second developing Member

123 connection segment

1231 third developing member

13 woven stent

131 first ribs

132. 132a, 132b, 132c first developing member

133 second rib

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and the utility model should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their repetitive description will be omitted

Reference in the specification to the expression "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," or the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the specification. Furthermore, the particular features, structures, materials, or characteristics shown may be combined in any suitable manner in any one or more embodiments or examples. Moreover, the various embodiments or examples and features of the various embodiments or examples presented in this specification may be combined and combined by those skilled in the art without being mutually inconsistent.

Terms representing relative spatial terms such as "lower", "upper", and the like may be used to more readily describe one element's relationship to another element as illustrated in the figures. Such terms are intended to include not only the meanings indicated in the drawings, but also other meanings or operations of the device in use. For example, if the device in the figures is turned over, elements described as "below" other elements would then be oriented "above" the other elements. Thus, the exemplary terms "under" and "beneath" all include above and below. The device may be rotated 90 or other angles and the terminology representing relative space is also to be interpreted accordingly. The "radial dimension" in the present invention means a distance between the farthest two points on the cross section, and the radial dimension of the braided wire is the diameter of the braided wire, taking the cross section of the braided wire as a circle as an example.

Although the terms first, second, etc. may be used herein to describe various elements in some instances, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first interface, a second interface, etc. Also, as used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context indicates otherwise. It will be further understood that the terms "comprises," "comprising," "includes" and/or "including," when used in this specification, specify the presence of stated features, steps, operations, elements, components, items, species, and/or groups, but do not preclude the presence, or addition of one or more other features, steps, operations, elements, components, items, species, and/or groups thereof. The terms "or" and/or "as used herein are to be construed as inclusive or meaning any one or any combination. Thus, "A, B or C" or "A, B and/or C" means "any of the following: a; b; c; a and B; a and C; b and C; A. b and C ". An exception to this definition will occur only when a combination of elements, functions, steps or operations are inherently mutually exclusive in some way.

Throughout the specification, when a device is referred to as being "connected" to another device, this includes not only the case of being "directly connected" but also the case of being "indirectly connected" with another element interposed therebetween. In addition, when a device "includes" a certain component, unless otherwise stated, the device does not exclude other components, but may include other components.

The following disclosure provides many different embodiments, or examples, for implementing different features of the utility model. To simplify the disclosure of the present description, the components and settings of a specific example are described below. Of course, they are merely examples and are not intended to limit the present description. Moreover, the description may repeat reference numerals and/or reference letters in the various examples, which have been repeated for purposes of simplicity and clarity and do not in themselves dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present description provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.

In order to solve the technical problems, the utility model provides a braided stent and a braided stent system, wherein the braided stent is in a tubular braided mesh structure and has an expansion state and a compression state; the woven support comprises at least one first rib and at least one first developing piece, wherein the first rib is composed of at least two silk materials, and the first developing piece is arranged on at least one first rib. The braided stent of the braided stent system is braided by adopting two or more wires partially or completely containing developing materials, and the developing property of the braided stent can be improved under the condition of a smaller proportion of developing weaving head number to non-developing weaving head number, namely under the condition of not influencing the radial supporting force of the braided stent, the stent opening and the like.

It should be noted that the proximal end and the distal end are relative to the operator, and the end closer to the operator is the proximal end, and the end farther from the operator is the distal end. The structure of the braided stent and the braided stent system of the present invention will be further described with reference to the accompanying drawings and specific embodiments, it being understood that the scope of the utility model is not limited by the specific embodiments.

Fig. 1 is a schematic structural view of a braided stent according to an embodiment of the present invention, in which the braided stent 13 has a tubular braided mesh structure and has an expanded state and a compressed state; the braided stent 13 comprises at least one first rib 131 and at least one first developing member 132, wherein the first rib 131 is composed of at least two filaments, and the first developing member 132 is disposed on at least one first rib 131. The first rib 131 is formed by parallel weaving, spiral winding or cross weaving of at least two wires.

The braided stent further comprises at least one second rib 133, the second rib 133 being composed of at least one wire; the braided stent is braided with first rib 131 and second rib 133 to form the tubular braided mesh structure. Braided stent 13 in the embodiment of fig. 1 is comprised of two types of ribs, namely a tubular braided structure formed by braiding first ribs 131 and second ribs 133. The first ribs 131 consist of two filaments and the second ribs 133 consist of one filament. In other embodiments, the first ribs are made of a plurality of wires and the second ribs are made of one wire, or the first ribs are made of two wires, the second ribs are made of a plurality of wires, and so on, which are not listed here. When the ribs of the braided stent 13 are made up of multiple filaments, the multiple filaments may be woven in parallel, spirally wound, cross-woven, or other configurations that are not spirally wound and/or non-woven, or even combinations thereof.

The material of the wire material can be one or the combination of more of nickel-titanium alloy, cobalt-chromium alloy wire or platinum alloy. For example, the wire may be a double-layered structure of wires, wherein each layer of the structure is composed of a different alloy material. The double-layer structure can be a two-layer laminated structure or a coaxial structure, for example, the wire comprises an outer layer structure and an inner layer structure wrapped by the outer layer structure, the outer layer structure is made of one alloy material, and the inner layer structure is made of another alloy material. Specifically, the outer layer structure may be a nickel-titanium alloy, a cobalt-chromium alloy, a nickel-cobalt alloy or the like, and the inner layer structure may be a metal material such as platinum, gold or tantalum or the like having a high attenuation coefficient under X-rays, and the higher the attenuation coefficient is, the stronger the radiopacity under X-rays is.

The cross section of the wire can be polygonal, such as triangle, quadrangle, etc., and can also be circular or oval. The dimension of the wire in the thickness or width direction, i.e. the radial dimension, may be between 15um and 150um, preferably between 15um and 60um, for example when the cross-section of the wire is circular, the diameter of the wire may be between 15um and 150um, preferably between 15um and 60 um.

The braided stent 13 of the present invention includes at least one first developing member 132, and the first developing member 132 is disposed on the first ribs 131 composed of a plurality of filaments. Still taking the embodiment of fig. 1 as an example, the first ribs 131 consist of two wires; the second ribs 133 are formed by a single wire, the single wire of the second ribs 133 may be a nickel-titanium or cobalt-based alloy wire, and the double wires of the first ribs 131 may be nickel-titanium wires (DFT wires). At this time, the plurality of first developing members 132 are disposed on the first ribs composed of a plurality of wires, i.e., on the first ribs 131 of two wires. The first developing member 132 may be made of one or more of pt-ir alloy, pt-ni alloy, pt-w alloy, w, ta and au

Fig. 2 is a schematic structural diagram of a first developing device according to a first embodiment of the present invention, wherein the first developing device 132a is cylindrical, circular or sheet-shaped, and the first developing device 132a is sleeved on the first ribs 131 of the knitted stent 13. When the first developing part 132a is in a sheet shape, one end of the first developing part 132a is clamped between two wires of the first rib 131 and then wraps the two wires, and the first developing part 132a can be further fixed on the first rib 131 in a laser welding or gluing mode, so that risks such as slipping and displacement of the first developing part 132a caused by friction in pushing, releasing and recovering processes can be effectively prevented, a doctor can judge the position of the bracket, the release ratio of the bracket and the like according to the position of the first developing part 132a, and the success rate of the operation is improved.

The first developing member 132 may be a spiral structure wound by a developing wire; the developing wires are wound on the outer surface of the first rib 131, or the developing wires are wound on the at least two wires of the first rib 131 in a crossing manner. Fig. 3 is a schematic structural diagram of a first developing member according to a second embodiment of the present invention, which is different from the first embodiment in that the first developing member 132b is a developing wire wound around the first ribs 131, and the developing wire may be an alloy wire of platinum iridium, platinum tungsten, etc. At least one end of the development wire is clamped between the at least two wires of the first rib 131. As shown in fig. 2, the two ends of the first developing member 132b are clamped between the two wires of the first rib 131, and the two ends 1321 and 1322 of the first developing member 132b can fix the developing wires on the two wires of the first rib 131 by laser welding or gluing, which can effectively prevent the first developing member 132b from slipping and shifting due to friction in the pushing, releasing and recovering processes.

Fig. 4 is a schematic structural view of a first developing member of a third embodiment of the present invention. Wherein the first developing member 132c is preferably disposed on the first ribs 131, and the first developing member 132c of the third embodiment is different from the second embodiment in that the developing wire of the first developing member 132c is wound one turn around one wire of the first ribs 131 and then one turn around the other wire of the first ribs 131, sequentially reciprocating, and finally, the two ends of the first developing member 132c are clamped between the two wires of the first ribs 131, the two ends of the first developing member 132c can fix the developing wires on the two wires of the first ribs 131 by laser welding or gluing, this way can effectively prevent that first development piece 132c from leading to risks such as development piece slippage aversion because of the frictional force in the propelling movement, release and the recovery process, ensures that the doctor can judge the position of support, the release proportion of support etc. according to the position of first development piece 132c, improves the operation success rate.

In different embodiments, a ratio K of the number of the first ribs to the number of the second ribs may be set, and the radial support force of the knitted stent may be ensured by reasonably setting the value K.

Still taking the example of fig. 1 in which the first ribs are composed of two wires and the second ribs are composed of a single wire, preferably, the ratio K of the number of first ribs to the number of said second ribs may be chosen to be less than or equal to 1, for example 1/32, 1/12, 1/8, 1/4, 1/2, 3/4, etc., but the utility model is not limited thereto. In other alternative embodiments, the ratio of the number of the first ribs to the number of the second ribs may have other values, and all of them are within the protection scope of the present invention. When the braided stent 13 includes more than two kinds of ribs, or the number of wires in each rib is different from that in the embodiment of fig. 1, a reasonable K value can be set to maintain the radial supporting force of the braided stent according to the use scenario of the braided stent system.

On the other hand, the whole body of the braided stent can be developed by reasonably setting the number of the first developing pieces arranged on the braided stent, so that doctors can judge the conditions of the position, release, opening, wall attachment and the like of the stent. The number of the first developing parts 132 may be one, two, three or more, when there are a plurality of the first developing parts 132, the plurality of the first developing parts 132 may be disposed at the 1/4, 1/2, 3/4, 4/5, etc. of the braided stent 13, or on the ribs including a plurality of wires at any other clinically desirable position, the first developing parts disposed at a certain position of the braided stent may help a doctor to judge the release ratio of the braided stent, and then the recovery release and adherence condition of the stent may be adjusted according to the actual release condition of the braided stent, so as to achieve the most satisfactory therapeutic effect.

FIG. 5 is a schematic structural view of a braided stent system according to an embodiment of the present invention, wherein the braided stent system comprises a delivery sheath 11 having a hollow lumen, a push guidewire 12, and a braided stent 13; the braided stent 13 is loaded on the distal end of the push guidewire 12, and the delivery sheath 11 is used for accommodating the push guidewire 12 and the braided stent 13. At least one end of the braided stent 13 is connected with the push guide wire 12, that is, the distal end or the proximal end of the braided stent 13 is connected with the push guide wire 12, and the connection between the two can be obtained by welding, adding a conveying and recovering element on the push guide wire 12 and the like. When the push guide wire 12 moves in the hollow inner cavity of the delivery sheath 11, the braided stent 13 can be driven to move in the hollow inner cavity of the delivery sheath 11.

When the number of the first developing members 132 is two or more, the plurality of the first developing members 132 may be arranged in a line when the braided stent 13 is compressed into the delivery sheath 11, that is, when the braided stent is in a compressed state, such an arrangement may reduce the pushing resistance increased by the increase of the first developing members on one hand, and increase the visible range of the braided stent 13 in the delivery sheath 11 on the other hand, thereby better helping a doctor to grasp the position of the braided stent 13 when pushing the braided stent 13 and the release opening ratio of the braided stent 13.

In other embodiments, a second and/or a third image is disposed on the push guidewire 12. The second developing member and/or the third developing member may be a ring structure or a spring structure.

As shown in fig. 5, the push guide wire 12 may further include a plurality of straight sections and transition sections, in this embodiment, optionally, the push guide wire 12 includes a straight section 121 at a proximal end, a connecting section 123 connected to one end of the braided stent 13, and a transition section 122 between the straight section 121 and the connecting section 123, at this time, the second visualization member 1221 may be a visualization ring sleeved on a distal end of the transition section 122, the proximal end of the braided stent 13 may also be connected thereto, and the second visualization member 1221 may help a physician judge a position of the proximal end of the braided stent. A third developing member 1231 may be disposed at the distal end of the connecting segment 123 of the pushing guide wire 12, and the third developing member 1231 may be a spring-structured developing member, more specifically, a developing member in which a wire having developing characteristics is spirally wound to form a spring structure.

The second developing member and the third developing member may be made of the same material as the first developing member, and may be made of a combination of one or more of platinum-iridium alloy, platinum-nickel alloy, platinum-tungsten alloy, tungsten, tantalum, and gold.

According to the woven support system, the proportion of various ribs forming the woven support and the number of the first developing pieces can be set according to actual use scenes, so that the woven support can be guaranteed to have certain radial supporting force, whole body development can be realized, a doctor is helped to judge the positions, release, opening, wall attachment and the like of the support, and the success rate of the operation is improved.

In the drawings of the present invention, the dimensional relationships of the respective components are merely examples, and are not intended as limitations between the present invention. In particular, the dimensions of the various components may be selected as desired and are within the scope of the present invention. The foregoing is a more detailed description of the utility model in connection with specific preferred embodiments and it is not intended that the utility model be limited to these specific details. For those skilled in the art to which the utility model pertains, several simple deductions or substitutions can be made without departing from the spirit of the utility model, and all shall be considered as belonging to the protection scope of the utility model.

Claims (13)

1. A braided stent, wherein the braided stent is a tubular braided mesh structure and has an expanded state and a compressed state;

the woven support comprises at least one first rib and at least one first developing piece, wherein the first rib is composed of at least two silk materials, and the first developing piece is arranged on at least one first rib.

2. The braided stent of claim 1 wherein said first struts are braided in parallel, helically wound or cross-woven from at least two filaments.

3. The braided stent of claim 1 wherein the material of the wire is one of a nickel-titanium alloy, a cobalt-chromium alloy, and a platinum alloy.

4. The woven stent of claim 1 wherein the filaments have a radial dimension of 15um to 150 um.

5. The woven stent of claim 1 further comprising at least a second rib, said second rib comprised of at least one wire; the braided stent is braided from the first and second tendons to form the tubular braided mesh structure.

6. The woven stent of claim 5 wherein the ratio of the number of first ribs to the number of second ribs is K, satisfying: k is more than 0 and less than or equal to 1.

7. The woven stent of claim 1 wherein the first developer member is a spiral structure wound with developer wire;

the developing wires are wound on the outer surface of the first rib, or the developing wires are wound on the at least two wires of the first rib in a crossed mode.

8. The woven stent of claim 7 wherein at least one end of said developer wire is sandwiched between said at least two filaments of said first tendon.

9. The woven stent of claim 1 wherein the first visualization member is a circular ring member or a cylindrical member, and the circular ring member or the cylindrical member is sleeved on the outer surface of the first rib.

10. The woven stent of claim 1 wherein the first developer is made from one of platinum iridium alloy, platinum nickel alloy, platinum tungsten alloy, tungsten, tantalum and gold.

11. The woven stent of claim 1 comprising a plurality of the first contrast members arranged in a line in an axial direction of the woven stent when the woven stent is in a compressed state.

12. A braided stent system comprising a delivery sheath, a pushwire, and the braided stent of any one of claims 1-11; the braided stent is loaded on the distal end of the push guide wire, and the delivery sheath is used for accommodating the push guide wire and the braided stent.

13. The braided stent system of claim 12 wherein said push guidewire has disposed thereon a second and/or third visualization member, said second and/or third visualization member being in a loop configuration or a spring configuration;

the second developer is disposed on the push guidewire on a proximal side of the braided stent;

the third developing part is arranged at the distal end of the pushing guide wire.

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