An enhanced intermediate catheter assembly and delivery system

Abstract

The present invention relates to an enhanced intermediate catheter assembly, comprising: an intermediate catheter having a lumen, the lumen being configured to accommodate a microcatheter; a first flexible support body, provided on the intermediate catheter and located in the lumen; the first flexible support body having a slit or mesh; a second flexible support body, provided on the intermediate catheter and located in the lumen; the second flexible support body having a slit or mesh; the first flexible support body and the second flexible support body being evenly distributed around the axis of the intermediate catheter, and a channel for the microcatheter to pass through is formed between the first flexible support body and the second flexible support body. By arranging a plurality of support wires in the lumen of the intermediate catheter, the microcatheter is supported by the support wires, and the stability of the microcatheter in the intermediate catheter is improved, and the microcatheter can be prevented from rotating in the intermediate catheter. At the same time, when angiography is required, the contrast agent can flow through the gaps between adjacent support wires, which is convenient for angiography. The present invention also relates to a delivery system.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to an enhanced intermediate catheter assembly and a delivery system. Background Art

[0002] Large blood vessels refer to blood vessels with a lumen diameter greater than 2 mm, for example, large blood vessels include the internal carotid artery (about 3.8 mm), the middle cerebral artery (about 2.8 mm), the intracranial segment of the vertebral artery (about 2.8 mm), and the basilar artery (about 3.2 mm). Medium blood vessels refer to blood vessels with a lumen diameter ranging from 0.75 mm to 2.0 mm. For intravascular interventional treatment, establishing a pathway is a technique that must be mastered. The coaxial technology in the process of establishing a pathway is equally important and needs to be mastered by every interventional physician. The purpose of the coaxial technology is to ensure the stability of the microcatheter's pathway in the intermediate catheter. The coaxial technology can further improve the success of the instrument in place, facilitate the microcatheter to move in the intermediate catheter, make the direction more accurate, and make the operator's operation more stable.

[0003] Therefore, while ensuring that the microcatheter passes smoothly in the intermediate catheter, the difference between the outer diameter of the microcatheter and the inner diameter of the intermediate catheter is required to be as small as possible, so that during the stent delivery process, the microcatheter shakes less and the stable release of the device can be guaranteed.

[0004] Although reducing the difference between the outer diameter of the microcatheter and the inner diameter of the intermediate catheter can increase coaxiality, the smaller the difference, the smaller the gap between the microcatheter and the intermediate catheter. When angiography is required during stent delivery, the injection of contrast agents is extremely difficult. When an intermediate catheter with a large inner diameter is used, the microcatheter will shake in the intermediate catheter, resulting in poor stability in device delivery. This leads to the fact that in reality, the outer diameter of the microcatheter cannot completely match the inner diameter of the intermediate catheter, resulting in the risk of misalignment.

[0005] Existing Publication 1: Chinese invention application with publication number CN114099910A;

[0006] Existing Publication 2: Chinese invention application with publication number CN116407212A;

[0007] Existing Publication 3: US invention with publication number US9358037B2;

[0008] Existing public document 4: US invention with publication number US20110264132A1. Summary of the invention

[0009] The invention provides an enhanced intermediate catheter assembly and a delivery system to solve the technical problems that the existing micro-catheter has poor stability in the intermediate catheter and is inconvenient for angiography.

[0010] The present invention discloses an enhanced intermediate catheter assembly, which includes an intermediate catheter, a first flexible support body, and a second flexible support body. The intermediate catheter has a lumen, and the lumen is configured to accommodate a microcatheter; the first flexible support body is arranged on the intermediate catheter and is located in the lumen; the first flexible support body has a gap or a mesh; the second flexible support body is arranged on the intermediate catheter and is located in the lumen; the second flexible support body has a gap or a mesh; the first flexible support body and the second flexible support body are uniformly distributed around the axis of the intermediate catheter, and a channel for the microcatheter to pass through is formed between the first flexible support body and the second flexible support body; or, the first flexible support body and the second flexible support body are symmetrically arranged, and a channel for the microcatheter to pass through is formed between the first flexible support body and the second flexible support body.

[0011] Furthermore, the first flexible support body and the second flexible support body each include a plurality of support wires, and the plurality of support wires of the first flexible support body and the plurality of support wires of the second flexible support body are uniformly distributed around the axis of the intermediate conduit to form the channel.

[0012] Furthermore, the first flexible support body is formed by a plurality of braided wires cross-woven into a sheet-like structure; the second flexible support body is formed by a plurality of braided wires cross-woven into a sheet-like structure; the first flexible support body and the second flexible support body are symmetrically arranged to form the channel.

[0013] Furthermore, the height of the first flexible support body is higher than that of the second flexible support body; and / or, an auxiliary support sheet is provided between the first flexible support body or the second flexible support body and the lumen wall.

[0014] Furthermore, the structures of the first flexible support body and the second flexible support body are symmetrical to each other.

[0015] Furthermore, the wire diameter of one end of the braided wire is 0.02mm~0.1mm, and the wire diameter of the other end of the braided wire is 0.05mm~0.1mm; the first flexible support body includes a first braided portion and a second braided portion, the first braided portion is woven by one end of the braided wire with a wire diameter of 0.02mm~0.1mm; the second braided portion is woven by one end of the braided wire with a wire diameter of 0.05mm~0.1mm; the braiding density of the first braided portion is greater than the braiding density of the second braided portion.

[0016] Furthermore, the first flexible support body and the second flexible support body are both formed by cross-weaving a plurality of braided wires; the structures of the first flexible support body and the second flexible support body are symmetrical to each other; the first flexible support body and the second flexible support body are symmetrically arranged to form the channel.

[0017] Furthermore, the first flexible support body includes a first woven portion and a second woven portion, and a woven density of the first woven portion is greater than a woven density of the second woven portion.

[0018] Further, a plurality of the first flexible support bodies are arranged in sequence and at intervals along the axis of the intermediate conduit; and / or a plurality of the second flexible support bodies are arranged in sequence and at intervals along the axis of the intermediate conduit.

[0019] Furthermore, at least one developing wire is provided on the first flexible support body, and the developing wire is arranged around the first flexible support body; and / or, at least one developing wire is provided on the second flexible support body, and the developing wire is arranged around the second flexible support body; the developing wire is made of any one of developing materials including platinum tungsten, platinum iridium, and tantalum.

[0020] The present invention also discloses a delivery system, which includes the enhanced intermediate catheter assembly as described in any one of the above embodiments.

[0021] In the prior art, intravascular stents are increasingly used as a conventional treatment for many vascular diseases, such as cardiovascular and cerebrovascular diseases such as aneurysms and atherosclerosis. Especially in tortuous blood vessels, when releasing the stent, the microcatheter may retreat or rotate, which may cause the unreleased stent or the released stent (i.e., at the distal end of the microcatheter) to be kinked, resulting in the risk of the stent being unable to open.

[0022] Compared with the prior art, in this embodiment, multiple support wires are arranged in the lumen of the intermediate catheter, the support wires are used to support the microcatheter, and the stability of the microcatheter in the intermediate catheter is improved, and the microcatheter can be prevented from rotating in the intermediate catheter. At the same time, when angiography is required, the contrast agent can flow through the gaps between adjacent support wires, which is convenient for angiography.

[0023] The foregoing general description and the following description are exemplary and explanatory only and are not intended to limit the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] One or more embodiments are exemplarily described by corresponding drawings, and these exemplary descriptions and drawings do not limit the embodiments. Elements with the same reference numerals in the drawings are regarded as similar elements, and wherein:

[0025] Figure 1 A cross-sectional view of an embodiment of a conveying system of the present invention Figure 1 ;

[0026] Figure 2 A side view of an embodiment of an enhanced intermediate conduit assembly of the present invention Figure 1 ;

[0027] Figure 3 A cross-sectional view of an embodiment of a conveying system of the present invention Figure 2 ;

[0028] Figure 4 A side view of an embodiment of an enhanced intermediate conduit assembly of the present invention Figure 2 ;

[0029] Figure 5 The cross-sectional view of an embodiment of an enhanced intermediate conduit assembly of the present invention is Figure 1 ;

[0030] Figure 6 The cross-sectional view of an embodiment of an enhanced intermediate conduit assembly of the present invention is Figure 2 ;

[0031] Figure 7 The cross-sectional view of an embodiment of an enhanced intermediate conduit assembly of the present invention is Figure 3 ;

[0032] Figure 8 is a schematic diagram of an embodiment of a braided wire of a reinforced intermediate catheter assembly of the present invention;

[0033] Fig. 9 The cross-sectional view of an embodiment of an enhanced intermediate conduit assembly of the present invention is Figure 4 ;

[0034] Fig.10 A side view of an embodiment of an enhanced intermediate conduit assembly of the present invention Figure 3 ;

[0035] Fig.11 A cross-sectional view of an embodiment of a conveying system of the present invention Figure 3 .

[0036] Reference numerals:

[0037] 1. Intermediate catheter; 11. Lumen; 21. First flexible support body; 22. Second flexible support body; 23. Support wire; 24. Gap; 25. Channel; 26. Braided wire; 27. Mesh; 28. Gap; 31. Large arc edge; 32. Small arc edge; 34. First braided portion; 35. Second braided portion; 36. Arc surface; 4. Microcatheter; 5. Auxiliary support sheet; 6. Visualizing wire. DETAILED DESCRIPTION

[0038] In order to be able to understand the features and technical contents of the embodiments of the present invention in more detail, the implementation of the embodiments of the present invention is described in detail below in conjunction with the accompanying drawings. The attached drawings are for reference only and are not used to limit the embodiments of the present invention. In the following technical description, for the convenience of explanation, a full understanding of the disclosed embodiments is provided through multiple details. However, one or more embodiments can still be implemented without these details. In other cases, to simplify the drawings, well-known structures and devices can be simplified for display.

[0039] The terms "first", "second", etc. in the description and claims of the embodiments of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged where appropriate, so that the embodiments of the embodiments of the present invention described here. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0040] In the embodiments of the present invention, the terms "upper", "lower", "inside", "middle", "outside", "front", "back" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. These terms are mainly used to better describe the embodiments of the present invention and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific direction, or to be constructed and operated in a specific direction. Moreover, in addition to being used to indicate directions or positional relationships, some of the above terms may also be used to indicate other meanings. For example, the term "upper" may also be used to indicate a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the embodiments of the present invention can be understood according to the specific circumstances.

[0041] In addition, the terms "disposed", "connected", and "fixed" should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0042] Unless otherwise specified, the term "plurality" means two or more and "plurality" means two or more.

[0043] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present invention may be combined with each other.

[0044] The applicant found that when a large inner diameter intermediate catheter is used during intravascular delivery of the stent, the microcatheter will shake in the intermediate catheter, resulting in poor stability of the device delivery. If the technical solution of reducing the difference between the outer diameter of the microcatheter and the inner diameter of the intermediate catheter is chosen, although the coaxiality can be increased, the smaller the difference, the smaller the gap between the microcatheter and the intermediate catheter. When angiography is required during the delivery of the stent, the injection of the contrast agent is extremely difficult.

[0045] In view of this, an embodiment of the present invention proposes an enhanced intermediate conduit assembly and a delivery system. Next, the technical solution of the present invention will be described in detail in conjunction with specific embodiments.

[0046] In the present invention, the distal end refers to the end away from the operator during surgery, and the proximal end refers to the end close to the operator during surgery.

[0047] First embodiment

[0048] The enhanced intermediate conduit assembly mentioned in this embodiment, such as Figure 1 , Figure 2 As shown, the enhanced intermediate catheter assembly includes an intermediate catheter 1, a first flexible support body 21, and a second flexible support body 22. The intermediate catheter 1 has a lumen 11. When in use, the microcatheter 4 can be disposed in the lumen 11 of the intermediate catheter 1, and the microcatheter 4 can move toward the distal end or the proximal end in the lumen 11 of the intermediate catheter 1.

[0049] In this embodiment, if Figure 2 As shown, the first flexible support body 21 and the second flexible support body 22 have the same structure, and both the first flexible support body 21 and the second flexible support body 22 include a plurality of support wires 23, and the support wires 23 are round metal wires or flat metal wires. Preferably, the support wires 23 are made of nickel-titanium alloy material to reduce immune rejection. When in use, the support wires 23 may be elastically deformed when the microcatheter 4 moves, and the support wires 23 made of nickel-titanium alloy material can be restored to their original state by utilizing the characteristics of nickel-titanium alloy memory alloy.

[0050] Optionally, the number of the support wires 23 ranges from 8 to 144, and the diameter of the support wires 23 ranges from 0.02 mm to 0.2 mm. Such a setting can ensure the supporting force of the support wires 23 on the microcatheter 4.

[0051] like Figure 1 , Figure 2 As shown, since the structures of the first flexible support body 21 and the second flexible support body 22 are the same, the first flexible support body 21 is taken as an example for introduction. The support wire 23 is located in the lumen 11 of the intermediate catheter 1, and both ends of the support wire 23 are connected to the wall of the lumen 11, and the middle part of the support wire 23 protrudes toward the axis of the intermediate catheter 1. There is a gap 24 between two adjacent support wires 23. The first flexible support body 21 and the second flexible support body 22 are both arranged in the lumen 11, and the first flexible support body 21 and the second flexible support body 22 each occupy half of the lumen 11. The multiple support wires 23 of the first flexible support body 21 and the multiple support wires 23 of the second flexible support body 22 are evenly distributed around the axis of the intermediate catheter 1, and form a channel 25, which can be used for the microcatheter 4 to pass through.

[0052] When in use, the microcatheter 4 moves distally in the lumen 11 of the intermediate catheter 1. When the microcatheter 4 passes through the channel 25 surrounded by the plurality of support wires 23, the support wires 23 undergo slight elastic deformation as the microcatheter 4 moves, and the portion of the support wires 23 protruding toward the middle axis contacts the outer wall of the microcatheter 4. The microcatheter 4 is fixed by the cooperation of the plurality of support wires 23, which not only facilitates the movement of the microcatheter 4 but also increases the stability of the microcatheter 4 and the intermediate catheter 1, and the gaps 24 between the adjacent support wires 23 facilitate the passage of the contrast agent.

[0053] In the prior art, intravascular stents are increasingly used as conventional treatments for many vascular diseases, such as cardiovascular and cerebrovascular diseases such as aneurysms and atherosclerosis. Especially in tortuous blood vessels, when releasing the stent, the microcatheter 4 may retreat or rotate, which may cause the unreleased stent or the released stent (i.e., at the distal end of the microcatheter 4) to be kinked, thereby causing the risk of the stent being unable to be opened.

[0054] Compared with the prior art, in this embodiment, a plurality of support wires 23 are arranged in the lumen 11 of the intermediate catheter 1, and the support wires 23 are used to support the microcatheter 4, and the stability of the microcatheter 4 in the intermediate catheter 1 is improved, and the microcatheter 4 can be prevented from rotating in the intermediate catheter 1. At the same time, when angiography is required, the contrast agent can flow through the gaps 24 between adjacent support wires 23, which is convenient for angiography.

[0055] Second embodiment

[0056] This embodiment also proposes an enhanced intermediate conduit assembly. The difference between the second embodiment and the first embodiment is that the structures of the first flexible support body 21 and the second flexible support body 22 are different, as follows:

[0057] like Figure 3 , Figure 4 As shown, the first flexible support body 21 is formed by a plurality of braided wires 26 interlaced and woven into a fan-shaped sheet structure, and the sheet structure has a plurality of meshes 27. Similarly, the second flexible support body 22 is formed by a plurality of braided wires 26 interlaced and woven into a fan-shaped sheet structure, and the sheet structure has a plurality of meshes 27. Because both the first flexible support body 21 and the second flexible support body 22 are fan-shaped sheet structures, the structure and setting of the first flexible support body 21 are taken as an example for introduction. The first flexible support body 21 includes a large arc edge 31 and a small arc edge 32, and the large arc edge 31 and the small arc edge 32 are respectively located at two ends of the first flexible support body 21. The first flexible support body 21 is located in the lumen 11 of the intermediate catheter 1, and the large arc edge 31 of the first flexible support body 21 is arranged on the wall of the lumen 11, and the dot of the first flexible support body 21 coincides with the axis of the intermediate catheter 1. The small arc edge 32 of the first flexible support body 21 is bent toward the distal end. The first flexible support 21 and the second flexible support 22 are symmetrically arranged, and the small arc edge 32 of the first flexible support 21 and the small arc edge 32 of the second flexible support 22 are arranged to form a channel 25, and the channel 25 can allow the microcatheter 4 to pass through. A gap 28 is also formed between the first flexible support 21 and the second flexible support 22, and the gap 28 is conducive to the passage of the contrast agent.

[0058] Optionally, the braided wire 26 is made of round metal wire or flat metal wire. Preferably, the braided wire 26 is made of nickel-titanium alloy material to reduce immune rejection reaction. When in use, when the microcatheter 4 moves, the first flexible support body 21 and the second flexible support body 22 may be elastically deformed. By utilizing the characteristics of nickel-titanium memory alloy, the braided wire 26 made of nickel-titanium alloy material can restore the first flexible support body 21 and the second flexible support body 22 to their original state after elastic deformation.

[0059] Optionally, the number of the braided wires 26 ranges from 8 to 144, and the wire diameter of the braided wires 26 ranges from 0.02 mm to 0.2 mm. Such a setting can ensure the supporting force of the first flexible support body 21 and the second flexible support body 22 on the microcatheter 4.

[0060] Compared with the prior art, in this embodiment, by arranging the first flexible support body 21 and the second flexible support body 22 in a fan-shaped sheet structure in the lumen 11 of the intermediate catheter 1, not only can the damage to the inner wall of the blood vessel be avoided, but also the microcatheter 4 can be clamped by the first flexible support body 21 and the second flexible support body 22, which can facilitate the movement of the microcatheter 4 to the distal end or the proximal end while avoiding the rotation of the microcatheter 4, thereby improving the coaxiality of the microcatheter 4 and the intermediate catheter 1, and also improving the stability of the microcatheter 4 in the intermediate catheter 1. At the same time, when angiography is required, the contrast agent can flow through the mesh 27 of the first flexible support body 21, the mesh 27 of the second flexible support body 22, and the gap 28 between the first flexible support body 21 and the second flexible support body 22, which is convenient for angiography.

[0061] Third embodiment

[0062] This embodiment also proposes an enhanced intermediate conduit assembly. The third embodiment is a further improvement on the second embodiment, and the main improvement lies in the structure and arrangement of the first flexible support body 21 and the second flexible support body 22, as follows:

[0063] Alternatively, if Figure 5 As shown, the height of the first flexible support body 21 is H, the height of the second flexible support body 22 is h, and H is greater than h. By making the height of the first flexible support body 21 higher than the height of the second flexible support body 22, when the microcatheter 4 moves toward the distal end in the intermediate catheter 1, the contact area between the first flexible support body 21 and the microcatheter 4 is larger, thereby increasing the supporting force of the first flexible support body 21 on the microcatheter 4, so that the intermediate catheter 1 disclosed in this embodiment is more suitable for the scene of blood vessel bifurcation.

[0064] Alternatively, if Figure 6 As shown, the enhanced intermediate catheter assembly also includes an auxiliary support sheet 5, which is woven into a sheet structure by a plurality of braided wires 26, and the sheet structure has a plurality of meshes 27. The auxiliary support sheet 5 is located in the lumen 11 of the intermediate catheter 1, and the auxiliary support sheet 5 is located between the first flexible support body 21 and the wall of the lumen 11. One side of the auxiliary support sheet 5 is fixedly connected to the wall of the lumen 11, and the other side of the auxiliary support sheet 5 is fixedly connected to the first flexible support body 21. The auxiliary support sheet 5 is arranged between the first flexible support body 21 and the wall of the lumen 11, which can not only increase the supporting force of the first flexible support body 21 on the microcatheter 4, but also make the intermediate catheter 1 disclosed in this embodiment more suitable for the scene of vascular bifurcation. At the same time, it can also prevent the first flexible support body 21 from being flipped during the movement of the microcatheter 4 to the proximal end and make the end of the first flexible support body 21 facing the distal end become the end facing the proximal end.

[0065] Alternatively, if Figure 6As shown, the enhanced intermediate catheter assembly also includes an auxiliary support sheet 5, which is woven into a sheet structure by a plurality of braided wires 26, and the sheet structure has a plurality of meshes 27. The auxiliary support sheet 5 is located in the lumen 11 of the intermediate catheter 1, and the auxiliary support sheet 5 is located between the second flexible support body 22 and the wall of the lumen 11. One side of the auxiliary support sheet 5 is fixedly connected to the wall of the lumen 11, and the other side of the auxiliary support sheet 5 is fixedly connected to the second flexible support body 22. The auxiliary support sheet 5 is arranged between the second flexible support body 22 and the wall of the lumen 11, which can not only increase the supporting force of the second flexible support body 22 on the microcatheter 4, but also make the intermediate catheter 1 disclosed in this embodiment more suitable for the scene of vascular bifurcation. At the same time, it can also prevent the second flexible support body 22 from being flipped during the movement of the microcatheter 4 to the proximal end and make the end of the second flexible support body 22 facing the distal end become the end facing the proximal end.

[0066] In this embodiment, any one of the three optional technical solutions mentioned above can be selected.

[0067] Of course, the optional technical solution that the height of the first flexible support body 21 is higher than the height of the second flexible support body 22 can be combined with the optional technical solution that an auxiliary support sheet 5 is provided between the first flexible support body 21 and the wall of the lumen 11. This can not only prevent the first flexible support body 21 from flipping over, but also increase the supporting force of the first flexible support body 21 on the microcatheter 4.

[0068] Of course, the optional technical solution that the height of the first flexible support body 21 is higher than the height of the second flexible support body 22 can be combined with the optional technical solution that an auxiliary support sheet 5 is provided between the second flexible support body 22 and the wall of the lumen 11. This can not only prevent the second flexible support body 22 from flipping over, but also increase the supporting force of the second flexible support body 22 on the microcatheter 4.

[0069] Of course, the optional technical solution of setting an auxiliary support sheet 5 between the first flexible support body 21 and the wall of the lumen 11 can be combined with the optional technical solution of setting an auxiliary support sheet 5 between the second flexible support body 22 and the wall of the lumen 11. This can not only prevent the first flexible support body 21 and the second flexible support body 22 from flipping over, but also increase the supporting force of the first flexible support body 21 and the second flexible support body 22 on the microcatheter 4.

[0070] Fourth embodiment

[0071] This embodiment also proposes an enhanced intermediate conduit assembly. The fourth embodiment is a further improvement based on the second or third embodiment, and the main improvements are:

[0072] Alternatively, if Figure 7As shown, the structure of the first flexible support 21 and the structure of the second flexible support 22 are symmetrical to each other. In this way, the supporting forces of the first flexible support 21 and the second flexible support 22 on the microcatheter 4 can be basically consistent. In the present invention, basically consistent means that due to the fact that there are errors in the manufacture of the first flexible support 21 and the second flexible support 22 in reality, and the positions and angles of the first flexible support 21 and the second flexible support 22 on the intermediate catheter 1 cannot be 100% the same, it is just to make the supporting force of the first flexible support 21 on the microcatheter 4 and the supporting force of the second flexible support 22 on the microcatheter 4 as consistent as possible.

[0073] Alternatively, if Figure 7 , Figure 8 As shown, because the first flexible support body 21 and the second flexible support body 22 are symmetrical structures, the first flexible support body 21 is introduced. The first flexible support body 21 is woven from a plurality of braided wires 26, and the wire diameter d of one end of the braided wire 26 used is 0.02mm~0.1mm, and the wire diameter D of the other end of the braided wire 26 is 0.05mm~0.1mm. At the same time, the first flexible support body 21 includes a first braided portion 34 and a second braided portion 35. The first braided portion 34 is woven from one end of the braided wire 26 with a wire diameter of 0.02mm~0.1mm, and the second braided portion 35 is woven from one end of the braided wire 26 with a wire diameter of 0.05mm~0.1mm. The wire diameter of the braided wire 26 of the second braided portion 35 is thick, which can facilitate the second braided portion 35 to be set on the wall of the lumen 11, and the connection structure strength with the wall of the lumen 11 is higher. The braided wires 26 of the first braided portion 34 have a thin wire diameter, which facilitates elastic deformation of the first braided portion 34 when in contact with the microcatheter 4. The wire diameter of the braided wires 26 is controlled to improve the support force of the first flexible support body 21 on the microcatheter 4.

[0074] Optionally, the weaving density of the first weaving portion 34 is greater than the weaving density of the second weaving portion 35 .

[0075] Of course, the two optional technical solutions of the weaving density of the first weaving portion 34 being greater than the weaving density of the second weaving portion 35 and the wire diameter of the weaving wire 26 of the first weaving portion 34 being thinner can be combined. This can not only enable the first weaving portion 34 to undergo elastic deformation when in contact with the microcatheter 4, but also ensure that the first flexible support body 21 has sufficient supporting force on the microcatheter 4 by increasing the weaving density.

[0076] Fifth embodiment

[0077] This embodiment also proposes an enhanced intermediate conduit assembly. The difference between the second embodiment and the first embodiment is that the structures of the first flexible support body 21 and the second flexible support body 22 are different, as follows:

[0078] like Fig. 9 , Fig.10 As shown, the first flexible support body 21 is formed by a plurality of braided wires 26 interlaced and woven into a braided body, the braided body is a block structure, and the braided body has a plurality of meshes 27, that is, the first flexible support body 21 has a plurality of meshes 27. Similarly, the second flexible support body 22 is formed by a plurality of braided wires 26 interlaced and woven into a braided body, the braided body is a block structure, and the braided body has a plurality of meshes 27, that is, the second flexible support body 22 has a plurality of meshes 27. The structures of the first flexible support body 21 and the second flexible support body 22 are symmetrical structures to each other. Because the structures of the first flexible support body 21 and the second flexible support body 22 are symmetrical structures to each other, the first flexible support body 21 is taken as an example for introduction. The first flexible support body 21 includes a first braided portion 34 and a second braided portion 35, and the braiding density of the first braided portion 34 is greater than the braiding density of the second braided portion 35. The first flexible support body 21 is arranged coaxially with the intermediate conduit 1. The second braided portion 35 is connected to the wall of the lumen 11, and the side of the first braided portion 34 facing the axis of the intermediate catheter 1 is a curved surface 36, which is used to fit the outer wall of the microcatheter 4. The first flexible support 21 and the second flexible support 22 are symmetrically arranged, and the curved surface 36 of the first flexible support 21 and the curved surface 36 of the second flexible support 22 are surrounded to form a channel 25, and the channel 25 can allow the microcatheter 4 to pass through. A gap 28 is also formed between the first flexible support 21 and the second flexible support 22, and the gap 28 is conducive to the passage of contrast agent.

[0079] Compared with the prior art, in this embodiment, by arranging the first flexible support body 21 and the second flexible support body 22 in a block structure in the lumen 11 of the intermediate catheter 1, not only can the damage to the inner wall of the blood vessel be avoided, but also the microcatheter 4 can be clamped by the first flexible support body 21 and the second flexible support body 22, which can facilitate the movement of the microcatheter 4 to the distal end or the proximal end while avoiding the rotation of the microcatheter 4, thereby improving the coaxiality of the microcatheter 4 and the intermediate catheter 1, and also improving the stability of the microcatheter 4 in the intermediate catheter 1. At the same time, when angiography is required, the contrast agent can flow through the mesh 27 of the first flexible support body 21, the mesh 27 of the second flexible support body 22, and the gap 28 between the first flexible support body 21 and the second flexible support body 22, which is convenient for angiography.

[0080] Sixth embodiment

[0081] This embodiment also proposes an enhanced intermediate conduit assembly. The sixth embodiment is a further improvement based on any one of the first to fifth embodiments, and the main improvements are:

[0082] A plurality of the first flexible support bodies 21 are sequentially arranged at intervals along the axis of the intermediate conduit 1 ; and / or a plurality of the second flexible support bodies 22 are sequentially arranged at intervals along the axis of the intermediate conduit 1 .

[0083] In this embodiment, the first flexible support body 21 and the second flexible support body 22 have the following optional technical solutions, which are as follows:

[0084] Alternatively, if Fig.11 As shown, the number of the first flexible support bodies 21 is at least two, and at least two first flexible support bodies 21 are arranged in sequence and spaced apart along the axis of the intermediate catheter 1. Such an arrangement can improve the support force of the first flexible support body 21 on the microcatheter 4. It can also prevent the microcatheter 4 from rotating, thereby improving the stability of the microcatheter 4 in the intermediate catheter 1. At the same time, it is convenient for the operator to perform angiography.

[0085] Alternatively, if Fig.11 As shown, the number of the second flexible support bodies 22 is at least two, and at least two second flexible support bodies 22 are arranged in sequence along the axis of the intermediate catheter 1. Such an arrangement can improve the support force of the second flexible support body 22 on the microcatheter 4. It can also prevent the microcatheter 4 from rotating, thereby improving the stability of the microcatheter 4 in the intermediate catheter 1. At the same time, it is convenient for the operator to perform angiography.

[0086] Alternatively, if Fig.11 As shown, the number of the first flexible support bodies 21 is at least two, and at least two first flexible support bodies 21 are arranged in sequence along the axis of the intermediate catheter 1. Similarly, the number of the second flexible support bodies 22 is at least two, and at least two second flexible support bodies 22 are arranged in sequence along the axis of the intermediate catheter 1. Such an arrangement can improve the support force of the first flexible support body 21 and the second flexible support body 22 on the microcatheter 4. It can also prevent the microcatheter 4 from rotating, and improve the stability of the microcatheter 4 in the intermediate catheter 1. At the same time, it is convenient for the operator to perform angiography.

[0087] In this embodiment, any one of the three optional technical solutions mentioned above can be selected.

[0088] Seventh embodiment

[0089] This embodiment also proposes an enhanced intermediate conduit assembly. The sixth embodiment is a further improvement based on any one of the first to sixth embodiments, and the main improvement lies in the arrangement of the developing wire 6, which is as follows:

[0090] Alternatively, if Figure 1 , Figure 3 , Fig. 9As shown, the enhanced intermediate conduit assembly of this embodiment further includes at least one developing wire 6, which is wound around the outer circumference of the first flexible support body 21. The developing wire 6 is made of any developing material of platinum tungsten, platinum iridium, or tantalum.

[0091] Alternatively, if Figure 1 , Figure 3 , Fig. 9 As shown, the enhanced intermediate conduit assembly of this embodiment further includes at least one developing wire 6, which is wound around the outer circumference of the second flexible support body 22. The developing wire 6 is made of any developing material of platinum tungsten, platinum iridium, or tantalum.

[0092] Alternatively, if Figure 1 , Figure 3 , Fig. 9 As shown, the enhanced intermediate conduit assembly of this embodiment further includes at least two developing wires 6, one developing wire 6 is wound around the outer periphery of the first flexible support body 21. The other developing wire 6 is wound around the outer periphery of the second flexible support body 22. The developing wire 6 is made of any developing material of platinum tungsten, platinum iridium, or tantalum.

[0093] In this embodiment, any one of the three optional technical solutions mentioned above can be selected.

[0094] In this embodiment, by arranging the developing wire 6 on the flexible supporting body, it is convenient to develop the flexible supporting body, so that the operator can observe the position of the flexible supporting body.

[0095] Of course, a developing spring may be used instead of the developing wire 6 .

[0096] Eighth embodiment

[0097] This embodiment proposes a delivery system. The system disclosed in the eighth embodiment includes the enhanced intermediate conduit assembly in any one of the first to seventh embodiments, specifically:

[0098] like Figures 1 to 4As shown, the delivery system includes an intermediate catheter 1, a first flexible support body 21, a second flexible support body 22 and a microcatheter 4. The first flexible support body 21 and the second flexible support body 22 are both arranged on the intermediate catheter 1 and are located in the lumen 11 of the intermediate catheter 1. The microcatheter 4 is arranged in the lumen 11 of the intermediate catheter 1, and the microcatheter 4 can move toward the distal end or the proximal end in the lumen 11 of the intermediate catheter 1. When the microcatheter 4 is located in the lumen 11, the first flexible support body 21 and the second flexible support body 22 simultaneously contact the outer wall of the microcatheter 4 and clamp the microcatheter 4, which can facilitate the movement of the microcatheter 4 toward the distal end or the proximal end while preventing the microcatheter 4 from rotating, thereby improving the stability of the microcatheter 4 in the intermediate catheter 1. At the same time, when angiography is required, the contrast agent can flow through the mesh 27 and the gap 28 to facilitate angiography; or the contrast agent can flow through the gap 24 to facilitate angiography.

[0099] Application scenario of an exemplary embodiment:

[0100] like Figure 1 , Figure 2 As shown, when the microcatheter 4 is arranged in the lumen 11 of the intermediate catheter 1, at this time, the first flexible support body 21 and the second flexible support body 22 are both in the original state. In the process of the microcatheter 4 moving toward the distal end, the end of the microcatheter 4 close to the distal end first contacts the first flexible support body 21 and the second flexible support body 22. As the microcatheter 4 moves toward the distal end, the first flexible support body 21 and the second flexible support body 22 first undergo elastic deformation. At this time, the first flexible support body 21 and the second flexible support body 22 clamp the microcatheter 4 and prevent the microcatheter 4 from rotating, thereby improving the stability of the microcatheter 4 in the intermediate catheter 1. At the same time, when angiography is required, the contrast agent can flow through the gap 24 to facilitate angiography.

[0101] The above description and the accompanying drawings fully illustrate the embodiments of the present invention so that those skilled in the art can practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations. Unless explicitly required, individual components and functions are optional, and the order of operations may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. The embodiments of the present invention are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. An enhanced intermediate conduit assembly, characterized in that: include: An intermediate catheter (1) having a lumen (11) configured to accommodate a microcatheter (4); A first flexible support body (21) is provided on the intermediate catheter (1) and is located in the lumen (11); the first flexible support body (21) has a mesh (27); A second flexible support body (22) is provided on the intermediate catheter (1) and is located in the lumen (11); the second flexible support body (22) has a mesh (27); The first flexible support body (21) is formed by a plurality of braided wires (26) interlaced and woven into a sheet-like structure; the second flexible support body (22) is formed by a plurality of braided wires (26) interlaced and woven into a sheet-like structure; or, both the first flexible support body (21) and the second flexible support body (22) are formed by a plurality of braided wires (26) interlaced and woven into a braided body; The first flexible support body (21) and the second flexible support body (22) are symmetrically arranged, and a channel (25) for the microcatheter (4) to pass through is formed between the first flexible support body (21) and the second flexible support body (22); A plurality of the first flexible support bodies (21) are sequentially arranged at intervals along the axis of the intermediate conduit (1); and a plurality of the second flexible support bodies (22) are sequentially arranged at intervals along the axis of the intermediate conduit (1); When contrast imaging is required, the contrast agent can flow through the mesh (27) of the first flexible support (21), the mesh (27) of the second flexible support (22) and the gap (28) between the first flexible support (21) and the second flexible support (22), thereby facilitating contrast imaging.

2. The enhanced intermediate conduit assembly according to claim 1, characterized in that: The height of the first flexible support body (21) is higher than the height of the second flexible support body (22); And / or, an auxiliary support sheet (5) is provided between the first flexible support body (21) or the second flexible support body (22) and the wall of the lumen (11).

3. The enhanced intermediate conduit assembly according to claim 1, characterized in that: The structures of the first flexible support body (21) and the second flexible support body (22) are symmetrical to each other.

4. The enhanced intermediate conduit assembly according to claim 3, characterized in that: The wire diameter of one end of the braided wire (26) is 0.02 mm to 0.1 mm, and the wire diameter of the other end of the braided wire (26) is 0.05 mm to 0.1 mm; the first flexible support body (21) comprises a first braided portion (34) and a second braided portion (35); the first braided portion (34) is braided by one end of the braided wire (26) having a wire diameter of 0.02 mm to 0.1 mm; the second braided portion (35) is braided by one end of the braided wire (26) having a wire diameter of 0.05 mm to 0.1 mm; the braiding density of the first braided portion (34) is greater than the braiding density of the second braided portion (35).

5. The enhanced intermediate conduit assembly according to claim 1, characterized in that: The first flexible support body (21) comprises a first braided portion (34) and a second braided portion (35), and the braiding density of the first braided portion (34) is greater than the braiding density of the second braided portion (35).

6. The enhanced intermediate conduit assembly according to any one of claims 1 to 5, characterized in that: At least one developing wire (6) is provided on the first flexible support body (21), and the developing wire (6) is arranged around the first flexible support body (21); and / or at least one developing wire (6) is provided on the second flexible support body (22), and the developing wire (6) is arranged around the second flexible support body (22); the developing wire (6) is made of any one of the developing materials of platinum tungsten, platinum iridium, and tantalum.

7. A conveying system, characterized in that: include: A reinforced intermediate conduit assembly as claimed in any one of claims 1 to 6.

Images