Braided supports and braided support systems

Abstract

This invention provides a braided support and a braided support system. The braided support is a tubular braided mesh structure and has an expanded state and a compressed state. The braided support includes at least one first rib and at least one first developing element, wherein the first rib is composed of at least two filaments, and the first developing element is disposed on at least one of the first ribs. The braided support system of this invention is woven from two or more filaments that contain some or all of the developing material, which can improve the developability of the braided support while maintaining a relatively small ratio of developing braids to non-developing braids, i.e., without affecting the radial support force or the opening of the support.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to a braided stent and a braided stent system. Background Technology

[0002] Intracranial aneurysms are abnormal bulges that occur on the walls of intracranial arteries. They are the leading cause of subarachnoid hemorrhage and, among cerebrovascular diseases, the third leading cause after cerebral thrombosis and hypertensive intracerebral hemorrhage. For some complex aneurysms (such as large aneurysms, wide-necked aneurysms, fusiform aneurysms, and dissecting aneurysms), endovascular braided stents are often used for treatment. The braided stent interferes with the blood flow from the parent artery into the aneurysm, causing blood stasis and thrombosis within the aneurysm, leading to complete occlusion. Furthermore, the braided stent can form a "scaffold" for the growth of vascular endothelial cells, which helps promote endothelialization of the aneurysm neck and thus prevents aneurysm rupture.

[0003] Currently, all braided stents used to treat aneurysms require radiopaque markers to help doctors determine stent placement, deployment, and apposition to the vessel wall, thus preventing risks such as in-stent thrombosis and stent damage to the blood vessel. Additionally, due to stent shortening that can lead to inaccurate stent deployment, many doctors require radiopaque markers on the stent to help them assess the deployment ratio. Because conventional radiopaque materials have poor resilience, are easily deformed under stress, and have low elastic modulus, existing braided stents are generally made of nickel-titanium or cobalt-based alloy wires. However, both nickel-titanium and cobalt-based alloy wires have relatively poor radiopaque properties. Therefore, stents on the market often combine nickel-titanium or cobalt-based alloy wires with radiopaque materials such as platinum-tungsten, platinum-iridium, and tantalum wires. Radiopaque properties are typically achieved by mixing nickel-titanium and cobalt-based alloy wires with radiopaque materials during the braiding process. Alternatively, radiopaque markers may be attached only to the head or tail of the stent. However, in tortuous blood vessels, it is difficult for surgeons to determine whether the stent has deployed and adhered well to the vessel wall using only a few radiopaque braided filaments. Furthermore, current braided stents rely on imaging points on the delivery rod to help surgeons determine the stent deployment ratio, a method that remains inaccurate. Even a slight displacement between the delivery rod and the stent can render the deployment ratio impossible to determine, significantly hindering the surgeon's operation. Meanwhile, to achieve blood flow guidance, the braided filaments have a very small diameter, typically 15-60 μm, to achieve high mesh density with low metal coverage. However, even with the inclusion of radiopaque filaments, it is still difficult to balance the radial support force of the stent and the relationship between stent deployment and imaging performance.

[0004] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of the present invention, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0005] To address the problems in the prior art, the present invention aims to provide a braided support and a braided support system. The braided support is made of two or more filaments that contain some or all of the developing material, thereby improving the developing properties of the braided support without affecting its radial support force or its ability to open.

[0006] The first aspect of the present invention provides a braided support, characterized in that the braided support is a tubular braided mesh structure and has an expanded state and a compressed state;

[0007] The braided support includes at least one first rib and at least one first developing element, wherein the first rib is composed of at least two filaments and the first developing element is disposed on at least one of the first ribs.

[0008] According to a first aspect of the invention, the first reinforcing bar is formed by at least two filaments being woven in parallel, spirally wound, or cross-woven.

[0009] According to a first aspect of the invention, the material of the filament is one or more combinations of nickel-titanium alloy, cobalt-chromium alloy, and platinum alloy.

[0010] According to a first aspect of the invention, the radial dimension of the filament is 15 μm to 150 μm.

[0011] According to a first aspect of the invention, the braided support further includes at least one second rib, the second rib being composed of at least one filament; the braided support is woven from the first rib and the second rib to form the tubular braided mesh structure.

[0012] According to a first aspect of the invention, the ratio of the number of the first ribs to the number of the second ribs is K, satisfying: 0 < K ≤ 1.

[0013] According to one embodiment of the present invention, the first developing element is a spiral structure formed by winding developing wires;

[0014] The developing filament is wound around the outer surface of the first rib, or the developing filament is crisscrossed and wound around the at least two filaments of the first rib.

[0015] According to a first aspect of the invention, at least one end of the developing filament is clamped between the at least two filaments of the first reinforcing bar.

[0016] According to a first aspect of the invention, the first developing element is a ring or a cylindrical element, which is sleeved on the outer surface of the first rib.

[0017] According to a first aspect of the present invention, the first developing element is prepared by one or more combinations of platinum-iridium alloy, platinum-nickel alloy, platinum-tungsten alloy, tungsten, tantalum and gold.

[0018] According to a first aspect of the invention, the braided support includes a plurality of first developing elements, wherein when the braided support is in a compressed state, the plurality of first developing elements are arranged in a line along the axial direction of the braided support.

[0019] A second aspect of the invention provides a braided support system, including a delivery sheath, a push wire, and the braided support; the braided support is mounted on the distal end of the push wire, and the delivery sheath is used to accommodate the push wire and the braided support.

[0020] According to a second aspect of the present invention, the push guide wire is provided with a second developing element and / or a third developing element, wherein the second developing element and / or the third developing element is a ring structure or a spring structure;

[0021] The second developing element is disposed on the push guide wire on the proximal side of the braided bracket;

[0022] The third imaging element is disposed at the distal end of the push guidewire.

[0023] The braided support system of the present invention is made of two or more filaments that contain some or all of the developing material. It can improve the developability of the braided support with a small ratio of developing braids to non-developing braids, that is, without affecting the radial support force of the braided support or the opening of the support.

[0024] Meanwhile, the braided stent has a radiopaque element set on the ribs woven from two or more filaments. In some embodiments, the radiopaque element is wrapped around the two or more filaments of the ribs, which can improve the interaction force between the radiopaque element and the ribs and prevent the radiopaque element from slipping or shifting due to factors such as pushing resistance, thus affecting the doctor's judgment on the stent's opening and release ratio.

[0025] Furthermore, imaging points can be placed at any location on the woven stent as needed. When there are two or more imaging points, they form a line when the stent is compressed. This reduces the increased pushing resistance caused by the increased metal content per unit cross-sectional area of ​​the stent under compression, and also expands the visible range (i.e., visible length) of the imaging points under compression. This makes it easier for doctors to determine the stent's position and release ratio, thus improving the success rate of the surgery. Attached Figure Description

[0026] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. Other features, objects, and advantages of the invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings. It is obvious that the drawings described below are merely some embodiments of the invention, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0027] Figure 1 This is a schematic diagram of the structure of a braided bracket according to an embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram of the structure of the first developing element according to the first embodiment of the present invention;

[0029] Figure 3 This is a schematic diagram of the structure of the first developing element according to the second embodiment of the present invention;

[0030] Figure 4 This is a schematic diagram of the structure of the first developing element according to the third embodiment of the present invention;

[0031] Figure 5 This is a schematic diagram of the structure of a braided support system according to an embodiment of the present invention.

[0032] Figure label:

[0033] 11. Delivery tube sheath

[0034] 12 Push the guide wire

[0035] 121 Straight Section

[0036] 122 Transition Section

[0037] 1221 Second developing piece

[0038] 123 Connecting Section

[0039] 1231 Third developing piece

[0040] 13 Braided support

[0041] 131 First tendon, first appearance

[0042] Image files 132, 132a, 132b, and 132c

[0043] 133 Second Rib Detailed Implementation

[0044] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms, and the invention should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided to make the invention more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore repeated descriptions of them will be omitted.

[0045] In this specification, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics represented in connection with that embodiment or example, which are included in at least one embodiment or example of this specification. Furthermore, the specific features, structures, materials, or characteristics represented may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples represented in this specification, as well as the features of different embodiments or examples.

[0046] Terms such as "below" and "above" indicating relative space are used to more easily explain the relationship of one device relative to another illustrated in the accompanying drawings. These terms refer not only to their meaning as shown in the drawings but also to other meanings or operations of the device in use. For example, if the device in the drawings is flipped, a device previously described as "below" another device may now be described as "above" another device. Therefore, the exemplary term "below" encompasses both above and below. The device may be rotated 90° or other angles, and the terms representing relative space are interpreted accordingly. The "radial dimension" referred to in this invention refers to the distance between the two farthest points on a cross-section. Taking a circular cross-section of a braided thread as an example, the radial dimension of the braided thread is its diameter.

[0047] Although the terms first, second, etc., are used in some instances herein to refer to various elements, these elements should not be limited by these terms. These terms are used only to distinguish one element from another. For example, first interface and second interface, etc., are used. Furthermore, 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 should be further understood that the terms “comprising,” “including,” indicate the presence of the stated feature, step, operation, element, component, item, kind, and / or group, but do not exclude the presence, occurrence, or addition of one or more other features, steps, operations, elements, components, items, kinds, and / or groups. The terms “or” and “and / or” as used herein are interpreted as inclusive, or mean any one or any combination thereof. Thus, “A, B, or C” or “A, B, and / or C” means “any one of: A; B; C; A and B; A and C; B and C; A, B, and C.” Exceptions to this definition will only occur if the combination of elements, functions, steps, or operations is inherently mutually exclusive in some way.

[0048] Throughout this specification, when it is said that a device is "connected" to another device, this includes not only "direct connection" but also "indirect connection" by placing other components in between. Furthermore, when it is said that a device "comprises" a certain constituent element, unless otherwise stated otherwise, this does not exclude other constituent elements, but rather implies that other constituent elements may be included.

[0049] The following disclosure provides numerous different embodiments or examples for implementing various structures of the invention. To simplify this disclosure, specific examples of components and settings are described below. These are merely examples and are not intended to limit the scope of this description. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or settings discussed. In addition, examples of various specific processes and materials are provided in this description, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0050] To address the existing technical problems, this invention provides a braided support and a braided support system. The braided support is a tubular braided mesh structure with both an expanded and a compressed state. The braided support includes at least one first rib and at least one first developing element, wherein the first rib is composed of at least two filaments, and the first developing element is disposed on at least one of the first ribs. The braided support system of this invention is woven from two or more filaments partially or entirely containing developing material, which can improve the developability of the braided support while maintaining a relatively small ratio of developing braids to non-developing braids, i.e., without affecting the radial support force or the opening of the support.

[0051] It should be noted that the terms "proximal end" and "distal end" are relative to the operator; the end closer to the operator is called the proximal end, and the end farther from the operator is called the distal end. The structure of the braided support and braided support system of the present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the various specific embodiments are not intended to limit the scope of protection of the present invention.

[0052] Figure 1 This is a schematic diagram of the structure of a braided support frame according to an embodiment of the present invention. The braided support frame 13 is a tubular braided mesh structure and has an expanded state and a compressed state. The braided support frame 13 includes at least one first rib 131 and at least one first developing element 132, wherein the first rib 131 is composed of at least two filaments, and the first developing element 132 is disposed on at least one of the first ribs 131. The first rib 131 is formed by at least two filaments being woven in parallel, spirally wound, or cross-woven.

[0053] The braided support also includes at least one second rib 133, which is composed of at least one filament; the braided support is woven from the first rib 131 and the second rib 133 to form the tubular braided mesh structure. Figure 1 In this embodiment, the braided support 13 is composed of two types of ribs, namely, a tubular braided structure formed by the first rib 131 and the second rib 133. The first rib 131 is composed of two filaments, and the second rib 133 is composed of one filament. In some other embodiments, the first rib is composed of multiple filaments, and the second rib is composed of one filament; or the first rib is composed of two filaments, and the second rib is also composed of multiple filaments, etc., which will not be listed here. When the ribs of the braided support 13 are composed of multiple filaments, the multiple filaments can be parallel braided, spirally wound braided, cross-woven, or other non-spiral wound and / or non-braided configurations, or even combinations of the above configurations.

[0054] The wire material can be one or a combination of nickel-titanium alloy, cobalt-chromium alloy, or platinum alloy. For example, the wire can be a double-layered structure, where each layer is composed of a different alloy material. The double-layered structure can be a two-layered structure or a coaxial structure, such as a wire comprising an outer layer and an inner layer wrapped by the outer layer. The outer layer is one alloy material, and the inner layer is another alloy material. Specifically, the outer layer can be made of materials such as nickel-titanium alloy, cobalt-chromium alloy, or nickel-cobalt alloy, while the inner layer can be made of metals with high attenuation coefficients under X-rays, such as platinum, gold, or tantalum. The higher the attenuation coefficient, the stronger the radiopaque linearity under X-rays.

[0055] The cross-section of the filament can be polygonal, such as a triangle or quadrilateral, or it can be circular or elliptical. The dimensions of the filament in the thickness or width direction, i.e., the radial dimension, can be between 15um and 150um, preferably between 15um and 60um. For example, when the cross-section of the filament is circular, the diameter of the filament can be between 15um and 150um, preferably between 15um and 60um.

[0056] The braided support 13 of the present invention includes at least one first developing element 132, and the first developing element 132 is disposed on the first reinforcing bar 131 composed of multiple filaments. Still using... Figure 1 In one embodiment, the first rib 131 is composed of two wires; the second rib 133 is composed of a single wire. The single wire of the second rib 133 can be a nickel-titanium or cobalt-based alloy wire, and the two wires of the first rib 131 can be nickel-titanium wire (DFT wire). In this case, multiple first developing elements 132 are disposed on the first rib composed of multiple wires, i.e., disposed on the first rib 131 with two wires. The first developing elements 132 can be made of one or more combinations of platinum-iridium alloy, platinum-nickel alloy, platinum-tungsten alloy, tungsten, tantalum, and gold.

[0057] Figure 2 This is a schematic diagram of the structure of the first imaging element according to the first embodiment of the present invention. The first imaging element 132a is cylindrical, annular, or sheet-shaped. The cylindrical or sheet-shaped first imaging element 132a is sleeved on the first rib 131 of the braided support 13. When the first imaging element 132a is sheet-shaped, one end of the first imaging element 132a is clamped between the two filaments of the first rib 131 and then the two filaments are wrapped around it. Furthermore, the first imaging element 132a can be further fixed to the first rib 131 by laser welding or adhesive bonding. This method can effectively prevent the risk of the first imaging element 132a slipping or shifting due to friction during the pushing, releasing, and retrieval process, ensuring that the doctor can determine the position of the support and the release ratio of the support based on the position of the first imaging element 132a, thereby improving the success rate of the surgery.

[0058] The first developing element 132 may be a spiral structure formed by winding developing filaments; the developing filaments are wound around the outer surface of the first rib 131, or the developing filaments are crisscrossed and wound around the at least two filaments of the first rib 131. Figure 3 This is a schematic diagram of the structure of the first developing element according to the second embodiment of the present invention. The second embodiment differs from the first embodiment in that the first developing element 132b is a developing wire wound around the first reinforcing rib 131. The developing wire can be an alloy wire such as platinum-iridium or platinum-tungsten. At least one end of the developing wire is clamped between at least two wires of the first reinforcing rib 131. Figure 2 As shown, the two ends of the first developing element 132b are sandwiched between the two filaments of the first rib 131. The two ends 1321 and 1322 of the first developing element 132b can be fixed to the two filaments of the first rib 131 by laser welding or adhesive bonding. This method can effectively prevent the risk of the first developing element 132b slipping or shifting due to friction during the pushing, releasing and recycling process.

[0059] Figure 4 This is a schematic diagram of the structure of the first imaging element according to the third embodiment of the present invention. Preferably, the first imaging element 132c is disposed on the first rib 131. The difference between the first imaging element 132c in the third embodiment and the second embodiment is that the imaging filament of the first imaging element 132c is first wound around one filament of the first rib 131, then around the other filament of the first rib 131, and so on, until both ends of the first imaging element 132c are finally clamped between the two filaments of the first rib 131. The two ends of the first imaging element 132c can be fixed to the two filaments of the first rib 131 by laser welding or adhesive bonding. This method can effectively prevent the risk of slippage or displacement of the first imaging element 132c due to friction during the pushing, releasing, and retrieving processes, ensuring that the doctor can determine the position of the stent, the release ratio of the stent, etc., based on the position of the first imaging element 132c, thereby improving the success rate of the surgery.

[0060] In different embodiments, the ratio K of the number of the first ribs to the number of the second ribs can be set. By reasonably setting the value of K, the radial support force of the braided bracket can be guaranteed.

[0061] Still with Figure 1Taking the example of a first reinforcing bar composed of two filaments and a second reinforcing bar composed of a single filament, preferably, the ratio K of the number of the first reinforcing bars to the number of the second reinforcing bars can be less than or equal to 1, for example, 1 / 32, 1 / 12, 1 / 8, 1 / 4, 1 / 2, 3 / 4, etc., but the present invention is not limited thereto. In other alternative embodiments, the ratio of the number of the first reinforcing bars to the number of the second reinforcing bars can also be other values, all of which are within the protection scope of the present invention. When the braided bracket 13 includes more than two types of reinforcing bars, or the number of wires in the various reinforcing bars is different from that in the second type, the ratio K is also acceptable. Figure 1 In the implementation of this method, a reasonable K value can also be set according to the scenario in which the braided support system is used to maintain the radial support force of the braided support.

[0062] On the other hand, by reasonably setting the number of first imaging elements on the braided stent of the present invention, the entire braided stent can be imaging, helping doctors to determine the position, release, opening, and adhesion of the stent. The number of first imaging elements 132 can be one, two, three, or more. When there are multiple first imaging elements 132, they can be set at 1 / 4, 1 / 2, 3 / 4, 4 / 5 of the length of the braided stent 13, or on any other clinically desired location, including the reinforcing bars of multiple filaments. The first imaging elements set at certain parts of the braided stent can help doctors determine the release ratio of the braided stent, and then adjust the retrieval, release, and adhesion of the stent according to the actual release of the braided stent to achieve the most satisfactory treatment effect.

[0063] Figure 5 This is a schematic diagram of a braided support system according to an embodiment of the present invention. The braided support system includes a delivery sheath 11 with a hollow inner cavity, a pusher wire 12, and a braided support 13. The braided support 13 is mounted on the distal end of the pusher wire 12, and the delivery sheath 11 accommodates the pusher wire 12 and the braided support 13. At least one end of the braided support 13 is connected to the pusher wire 12, that is, the distal or proximal end of the braided support 13 is connected to the pusher wire 12. The connection between the two can be achieved by welding, adding a delivery and recovery element to the pusher wire 12, or other methods. When the pusher wire 12 moves within the hollow inner cavity of the delivery sheath 11, it can drive the braided support 13 to move within the hollow inner cavity of the delivery sheath 11.

[0064] When there are two or more first imaging elements 132, when the braided support 13 is compressed into the delivery sheath 11, that is, when the braided support is in a compressed state, the multiple first imaging elements 132 can be arranged in a line. This arrangement can reduce the pushing resistance caused by the increase in the number of first imaging elements, and increase the visibility range of the braided support 13 in the delivery sheath 11, which can better help doctors grasp the position of the braided support 13 when pushing it and the release and opening ratio of the braided support 13.

[0065] In some other embodiments, the push guide wire 12 is provided with a second developing element and / or a third developing element. The second developing element and / or the third developing element can be a ring structure or a spring structure.

[0066] like Figure 5 As shown, the guidewire 12 can be composed of multiple straight sections and transition sections. In this embodiment, optionally, the guidewire 12 includes a proximal straight section 121, a connecting section 123 connecting one end of the braided support 13, and a transition section 122 between the straight section 121 and the connecting section 123. In this case, the second imaging element 1221 can be an imaging ring sleeved on the distal end of the transition section 122, and the proximal end of the braided support 13 can also be connected here. The second imaging element 1221 can help the doctor determine the position of the proximal end of the braided support. The third imaging element 1231 can be disposed at the distal end of the connecting section 123 of the guidewire 12. The third imaging element 1231 can be an imaging element with a spring structure. More specifically, the third imaging element is an imaging element with imaging properties formed by spirally winding a wire to form a spring structure.

[0067] The materials of the second and third developing elements are the same as those of the first developing element, and they can be made from one or more of the following: platinum-iridium alloy, platinum-nickel alloy, platinum-tungsten alloy, tungsten, tantalum, and gold.

[0068] The braided scaffold system of the present invention allows for the setting of the proportions of various ribs constituting the braided scaffold, as well as the number of first imaging elements, according to the actual usage scenario. On the one hand, it ensures that the braided scaffold has a certain radial support force, and on the other hand, it enables whole-body imaging, helping doctors to determine the position, release, opening, and wall adhesion of the scaffold, thereby improving the success rate of the surgery.

[0069] In the various accompanying drawings of this invention, the dimensional relationships of the various components are merely illustrative and not intended to limit the scope of the invention. Specifically, the dimensions of each component can be selected and set as needed, and all such selections fall within the protection scope of this invention. The above description is a further detailed explanation of this invention in conjunction with specific preferred embodiments, and it should not be construed that the specific implementation of this invention is limited to these descriptions. For those skilled in the art, several simple deductions or substitutions can be made without departing from the concept of this invention, and all such deductions or substitutions should be considered to fall within the protection scope of this invention.

Claims

1. A braided support frame, characterized in that, The braided support is a tubular braided mesh structure, and has an expanded state and a compressed state; The braided support includes at least one first rib and at least one first developing element, wherein the first rib is composed of at least two filaments, and the first developing element is disposed on at least one of the first ribs; wherein... The first developing element is a spiral structure formed by winding developing filaments. At least one end of each developing filament is clamped between at least two filaments of the first rib, and the developing filaments are wound around the outer surface of the first rib, or the developing filaments are crisscrossed and wound around the at least two filaments of the first rib; or The first developing element is sheet-shaped, with one end of the first developing element clamped between the at least two filaments of the first rib, and the first developing element covering the at least two filaments; The braided support includes a plurality of first developing elements, and when the braided support is in a compressed state, the plurality of first developing elements are arranged in a line along the axial direction of the braided support. The braided support also includes at least one second rib, which is composed of at least one filament; the braided support is woven from the first rib and the second rib to form the tubular braided mesh structure.

2. The braided support according to claim 1, characterized in that, The first reinforcing bar is made of at least two wires woven in parallel, spirally wound, or cross-woven.

3. The braided support according to claim 1, characterized in that, The material of the wire is one or more of nickel-titanium alloy, cobalt-chromium alloy and platinum alloy.

4. The braided support according to claim 1, characterized in that, The radial dimension of the filament is 15um to 150um.

5. The braided support according to claim 1, characterized in that, The ratio of the number of the first ribs to the number of the second ribs is K, which satisfies: 0 < K ≤ 1.

6. The braided support according to claim 1, characterized in that, The first developing element is made of one or more of the following materials: platinum-iridium alloy, platinum-nickel alloy, platinum-tungsten alloy, tungsten, tantalum, and gold.

7. A braided support system, characterized in that, The device includes a delivery sheath, a pusher wire, and a braided support as described in any one of claims 1-6; the braided support is mounted on the distal end of the pusher wire, and the delivery sheath is used to accommodate the pusher wire and the braided support.

8. The braided support system according to claim 7, characterized in that, The push guide wire is provided with a second developing element and / or a third developing element, wherein the second developing element and / or the third developing element is a ring structure or a spring structure; The second developing element is disposed on the push guide wire on the proximal side of the braided bracket; The third imaging element is disposed at the distal end of the push guidewire.

Images