Enhanced middle guide pipe assembly and conveying system

Abstract

The present invention relates to an enhanced intermediate catheter assembly, comprising: an intermediate catheter having a lumen within which a microcatheter can move; the at least two elastic supporting sheet bodies are positioned in the tube cavity and are arranged on the wall of the tube cavity; the elastic supporting sheet body is made of a high polymer material; the height of the elastic supporting sheet body ranges from 0.25 mm to 0.5 mm; a circulation hole for a contrast agent to circulate is formed between the elastic supporting sheet body and the wall of the tube cavity; a channel through which a microcatheter can pass is formed between the at least two elastic supporting sheet bodies; a gap for circulation of a contrast agent is formed between every two adjacent elastic supporting sheet bodies. The plurality of elastic supporting sheet bodies are arranged on the wall of the catheter cavity of the middle catheter, and the plurality of elastic supporting sheet bodies which are uniformly distributed around the axis of the middle catheter are used for supporting the micro catheter, so that the stability of the micro catheter in the middle catheter can be improved, and the circulation of a contrast agent is also facilitated. The invention also relates to a conveying system.

Description

[0001] This application claims priority to patent application number 2024117326581. Technical Field

[0002] The invention relates to the technical field of intermediate catheters, and in particular to an enhanced intermediate catheter component and a conveying system. Background Art

[0003] For intravascular interventional treatment, establishing a pathway is a skill that every interventional physician must master. The coaxial technology in the process of establishing the pathway is equally important. 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 increase the success rate of the device in place. It not only facilitates the movement of the microcatheter in the intermediate catheter, but also makes the movement direction more accurate, and also makes the operator's operation more stable.

[0004] Therefore, under the premise of ensuring that the microcatheter can pass 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. During the stent delivery process, the microcatheter has a small shaking amplitude, which further ensures the stable release of the device.

[0005] In the prior art, in order to increase the coaxiality between the microcatheter and the intermediate catheter, the method of reducing the difference between the outer diameter of the microcatheter and the inner diameter of the intermediate catheter is usually adopted. However, the smaller the difference, the smaller the gap between the microcatheter and the intermediate catheter. This will make the injection of contrast agent extremely difficult during angiography. If an intermediate catheter with a large inner diameter is used, the difference will become larger, and the microcatheter will shake in the intermediate catheter, making the stability of the device delivery worse. This will not only cause the microcatheter and the intermediate catheter to be unable to adapt, but also lead to the risk of misalignment.

[0006] During the research and development process of the inventor, the inventor also found some relevant information about the microcatheter and the intermediate catheter, among which, a Chinese invention application with a publication number of CN118304543A and an invention name of an enhanced microcatheter and a delivery system discloses an enhanced microcatheter, which includes a microcatheter and a flexible braided tube body, and the microcatheter is configured in the lumen of the intermediate catheter. One end of the flexible braided tube body is arranged on the microcatheter, and the flexible braided tube body is a self-expanding braided tube woven from a plurality of braided wires, and the flexible braided tube body has a plurality of meshes. When the microcatheter is arranged in the lumen, the flexible braided tube body is arranged between the intermediate catheter and the microcatheter. By arranging the flexible braided tube body on the microcatheter, the coaxiality of the microcatheter and the intermediate catheter can be ensured, and the stability of the microcatheter in the intermediate catheter can be further improved. It can also prevent the microcatheter from rotating in the intermediate catheter. At the same time, when contrast imaging is required, the contrast agent can circulate through the plurality of meshes on the flexible braided tube body. Summary of the invention

[0007] 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.

[0008] The present invention discloses an enhanced intermediate catheter assembly, which includes an intermediate catheter and at least two elastic support sheets. The intermediate catheter has a lumen in which a microcatheter can move. The at least two elastic support sheets are both located in the lumen and are arranged on the lumen wall. The elastic support sheets are made of polymer materials. The height range of the elastic support sheets is 0.25 mm to 0.5 mm. A flow hole for contrast medium to flow is formed between the elastic support sheet and the lumen wall. A channel for microcatheter to pass through is formed between at least two elastic support sheets. A gap for contrast medium to flow is formed between two adjacent elastic support sheets. At least two elastic support sheets form a group, and multiple groups of elastic support sheets are arranged in the lumen. The multiple groups of elastic support sheets are arranged in sequence along the axis of the intermediate catheter. When in use, the elastic support sheet can be abutted by the microcatheter and undergo elastic deformation.

[0009] The present invention also discloses a delivery system, which comprises the enhanced intermediate catheter assembly as described in any one of the above items.

[0010] In the prior art, stent implantation is a treatment method often used for cardiovascular and cerebrovascular diseases such as aneurysms and atherosclerosis. When releasing the stent in a tortuous blood vessel, when the microcatheter moves proximally or may rotate, this may cause the unreleased stent or the released stent to be kinked, resulting in the risk that the stent cannot be opened and expanded. During the implantation of the stent, if the inner diameter of the intermediate catheter used is large, the microcatheter may shake inside the intermediate catheter, which may cause the stability of the stent delivery to deteriorate. If the inner diameter of the intermediate catheter used is small, the difference between the inner diameter of the intermediate catheter and the outer diameter of the microcatheter will also become smaller, which also means that the gap between the intermediate catheter and the microcatheter will become smaller. Although the coaxiality of the two can be increased, the injection of contrast agent will become very difficult.

[0011] Compared with the prior art, in this embodiment, by arranging a plurality of elastic support sheets with triangular cross-sections on the lumen wall of the intermediate catheter, and using a plurality of elastic support sheets evenly distributed around the axis of the intermediate catheter to support the microcatheter, the stability of the microcatheter in the intermediate catheter can be improved, and the microcatheter can be prevented from rotating in the intermediate catheter. When contrast imaging is required, the contrast agent can not only flow through the flow holes formed by the elastic support sheets and the lumen wall of the intermediate catheter, but also flow through the gap between two adjacent elastic support sheets. Such an arrangement reduces the obstacles to the flow of contrast agents.

[0012] 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

[0013] 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:

[0014] Figure 1 A cross-sectional view of an embodiment of a conveying system of the present invention Figure 1 ;

[0015] Figure 2 is a cross-sectional view of an embodiment of an enhanced intermediate conduit assembly of the present invention Figure 1 ;

[0016] Figure 3 A schematic side view of an embodiment of an elastic support sheet of an enhanced intermediate conduit assembly of the present invention Figure 1 ;

[0017] Figure 4 is a cross-sectional view of an embodiment of an enhanced intermediate conduit assembly of the present invention Figure 2 ;

[0018] Figure 5 A schematic side view of an embodiment of an elastic support sheet of an enhanced intermediate conduit assembly of the present invention Figure 2 ;

[0019] Figure 6 is a cross-sectional view of an embodiment of an enhanced intermediate conduit assembly of the present invention Figure 3 ;

[0020] Figure 7 A schematic side view of an embodiment of an elastic support sheet of an enhanced intermediate conduit assembly of the present invention Figure 3 ;

[0021] Figure 8 A cross-sectional view of an embodiment of a conveying system of the present invention Figure 2 ;

[0022] Fig. 9 is a cross-sectional view of an embodiment of an enhanced intermediate conduit assembly of the present invention Figure 4 ;

[0023] Fig.10 is a cross-sectional schematic diagram of an embodiment of an enhanced intermediate conduit assembly of the present invention;

[0024] Fig.11 is a cross-sectional view of an embodiment of an enhanced intermediate conduit assembly of the present invention Figure 5 ;

[0025] Fig.12 is a cross-sectional view of an embodiment of an enhanced intermediate conduit assembly of the present invention Figure 6 ;

[0026] Fig.13 A schematic side view of an embodiment of an elastic support sheet of an enhanced intermediate conduit assembly of the present invention Figure 4 ;

[0027] Fig.14 is a cross-sectional view of an embodiment of an enhanced intermediate conduit assembly of the present invention Figure 7 ;

[0028] Fig.15 A schematic side view of an embodiment of an elastic support sheet of an enhanced intermediate conduit assembly of the present invention Figure 5 ;

[0029] Fig.16 A schematic side view of an embodiment of an elastic support sheet of an enhanced intermediate conduit assembly of the present invention Figure 6 ;

[0030] Fig.17 It is a schematic diagram of an embodiment of a developing reinforcement net of an enhanced intermediate conduit assembly of the present invention.

[0031] Reference numerals:

[0032] 1. Intermediate catheter; 11. Lumen; 12. Channel; 13. Gap; 2. Elastic support sheet; 21. First support portion; 22. Second support portion; 23. Flow hole; 24. Third support portion; 25. Chamfer; 26. First partition; 27. First flow sub-hole; 28. Diverter hole; 29. ​​Second partition; 30. Second flow sub-hole; 31. Guide sheet; 32. Development reinforcement mesh; 33. Microcatheter. DETAILED DESCRIPTION

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] Unless otherwise specified, the term "plurality" means two or more and "plurality" means two or more.

[0038] 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.

[0039] 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.

[0040] First embodiment

[0041] The enhanced intermediate conduit assembly mentioned in this embodiment, such as Figure 1 , Figure 2As shown, the enhanced intermediate catheter assembly includes an intermediate catheter 1 and a plurality of elastic support sheets 2, and the intermediate catheter 1 has a lumen 11 therein. When in use, the microcatheter 33 can be arranged in the lumen 11 of the intermediate catheter 1, and the microcatheter 33 can move toward the distal end or the proximal end in the lumen 11 of the intermediate catheter 1. A plurality of groups of elastic support sheets 2 are arranged in the lumen 11 of the intermediate catheter 1, and the plurality of groups of elastic support sheets 2 are arranged in sequence and at intervals along the axis of the intermediate catheter 1. Such an arrangement can ensure the coaxiality of the microcatheter 33 and the intermediate catheter 1. Taking a group of elastic support sheets 2 as an example, the group of elastic support sheets 2 includes a plurality of elastic support sheets, and the plurality of elastic support sheets 2 are all located in the lumen 11 of the intermediate catheter 1, and both ends of the plurality of elastic support sheets 2 are arranged on the wall of the lumen 11 of the intermediate catheter 1. The plurality of elastic support sheets 2 are evenly distributed around the axis of the intermediate catheter 1, and a channel 12 is formed between the plurality of elastic support sheets 2, that is, Figure 2 The dotted circle represents the channel 12, through which the microcatheter 33 can pass. When in use, the elastic support sheet 2 can be abutted by the microcatheter 33 and elastically deformed. A gap 13 is formed between two adjacent elastic support sheets 2, through which the contrast agent can flow.

[0042] As shown Figures 1 to 3 As shown, in this embodiment, the structures of multiple elastic support sheets 2 are the same, so the structure of one of the elastic support sheets 2 is taken as an example for introduction, and the elastic support sheet 2 is made of polymer material. Optionally, the elastic support sheet 2 can be made of any polymer material among silicone, TPU, and Pebax. The height H of the elastic support sheet 2 ranges from 0.25mm to 0.5mm; the elastic support sheet 2 is integrally formed, and the elastic support sheet 2 includes a first support portion 21 and a second support portion 22, and the first support portion 21 is connected to the side of the second support portion 22 along its length direction. The first support portion 21 is connected to the wall of the lumen 11 along the other side of its length direction, and the second support portion 22 is connected to the wall of the lumen 11 along the other side of its length direction, and the first support portion 21 and the second support portion 22 are symmetrically arranged. The height of the first support portion 21 is the same as the height of the second support portion 22, that is, the height of the first support portion 21 can be regarded as the height H of the elastic support sheet 2. A first angle α is formed between the first support portion 21 and the second support portion 22, and the first angle α is 60°. A side surface of the connection between the first support portion 21 and the second support portion 22 facing the axis of the intermediate catheter 1 is an arc surface, and the arc surface is coaxially arranged with the intermediate catheter 1. The first support portion 21, the second support portion 22 and the wall of the lumen 11 are jointly surrounded to form a flow hole 23, and the flow hole 23 can be used for the flow of contrast agent.

[0043] When the enhanced intermediate catheter assembly of this embodiment is in use, one end of the microcatheter 33 enters the lumen 11 of the intermediate catheter 1 and moves toward the distal end. When the microcatheter 33 passes through the channel 12 surrounded by the multiple elastic support sheets 2, as the microcatheter 33 moves, the multiple elastic support sheets 2 undergo slight elastic deformation, and the first support portion 21 and the second support portion 22 of the elastic support sheet 2 are respectively squeezed toward the gap 13 on both sides of the elastic support sheet 2, and the arc surfaces of the multiple elastic support sheets 2 are respectively in contact with the outer tube wall of the microcatheter 33. Through the cooperation of the multiple elastic support sheets 2 and the clamping and fixing of the microcatheter 33, the movement of the microcatheter 33 is facilitated while the stability of the microcatheter 33 and the intermediate catheter 1 is increased, and the gap 13 and the flow hole 23 between the adjacent elastic support sheets 2 are conducive to the passage of the contrast agent.

[0044] In the prior art, stent implantation is a treatment method often used for cardiovascular and cerebrovascular diseases such as aneurysms and atherosclerosis. When releasing the stent in a tortuous blood vessel, when the microcatheter 33 moves proximally or may rotate, this may cause the unreleased stent or the released stent to be kinked, thereby causing the risk that the stent cannot be opened and expanded. During the implantation of the stent, if the inner diameter of the intermediate catheter 1 is large, the microcatheter 33 may shake in the intermediate catheter 1, which may cause the stability of the stent delivery to deteriorate. If the inner diameter of the intermediate catheter 1 is small, the difference between the inner diameter of the intermediate catheter 1 and the outer diameter of the microcatheter 33 is also reduced, which also means that the gap 13 between the intermediate catheter 1 and the microcatheter 33 is reduced. Although the coaxiality of the two can be increased, the injection of the contrast agent becomes very difficult.

[0045] Compared with the prior art, in this embodiment, by arranging a plurality of elastic support sheets 2 with a triangular cross-section on the wall of the lumen 11 of the intermediate catheter 1, and supporting the microcatheter 33 with a plurality of elastic support sheets 2 evenly distributed around the axis of the intermediate catheter 1, the stability of the microcatheter 33 in the intermediate catheter 1 can be improved, and the microcatheter 33 can be prevented from rotating in the intermediate catheter 1. When contrast imaging is required, the contrast agent can not only flow through the flow hole 23 formed by the elastic support sheet 2 and the wall of the lumen 11 of the intermediate catheter 1, but also flow through the gap 13 between two adjacent elastic support sheets 2. Such an arrangement reduces the obstacles to the flow of contrast agent.

[0046] In the prior art, during one operation, one intermediate catheter 1 cannot be adapted to micro-catheters 33 of different outer diameters.

[0047] When the enhanced intermediate catheter assembly disclosed in the present embodiment is used, it does not need to be replaced, and only the microcatheter 33 of different outer diameters needs to be replaced. Specifically, a microcatheter 33 is used first, and multiple elastic support sheets 2 just clamp the microcatheter 33, and the height of the elastic support sheet 2 is 0.5mm at this time. When a new microcatheter 33 needs to be replaced, the outer diameter of the new microcatheter 33 is larger than the outer diameter of the previous microcatheter 33. When the new microcatheter 33 enters the channel 12 between the multiple elastic support sheets 2, due to the large outer diameter of the new microcatheter 33, the new microcatheter 33 will squeeze the elastic support sheet 2 and cause the elastic support sheet 2 to undergo elastic deformation, and the height of the elastic support sheet 2 is reduced, and at this time the height of the elastic support sheet 2 is less than 0.5mm. The height of the elastic support sheet 2 can be reduced from 0.5mm to 0.25mm. 0.25mm is the minimum height of the elastic support sheet 2. The enhanced intermediate catheter assembly of this embodiment can adapt to microcatheters 33 of different outer diameters without replacing the intermediate catheter 1 assembly in the same operation.

[0048] Second embodiment

[0049] This embodiment also proposes an enhanced intermediate conduit assembly. The difference between the second embodiment and the first embodiment lies in the different structures and numbers of the elastic support sheets 2, as follows:

[0050] Optional, such as Figure 1 , Figure 4 , Figure 5 As shown, when the number of the elastic support sheets 2 is two, the two elastic support sheets 2 are respectively located on both sides of the axis of the intermediate conduit 1, and the two elastic support sheets 2 are symmetrically arranged. In this embodiment, the structures of the multiple elastic support sheets 2 are the same, so the structure of one of the elastic support sheets 2 is taken as an example for introduction. The elastic support sheet 2 is integrally formed, and the elastic support sheet 2 includes a first support portion 21, a second support portion 22 and a third support portion 24. One side of the first support portion 21 along its length direction is connected to one side of the third support portion 24 along its length direction, and one side of the second support portion 22 along its length direction is connected to the other side of the third support portion 24 along its length direction. The other side of the first support portion 21 along its length direction and the other side of the second support portion 22 along its length direction are both connected to the wall of the lumen 11, and the first support portion 21 and the second support portion 22 are arranged in parallel. The third support portion 24 is an arc-shaped sheet structure, and the cross-sectional shape of the third support portion 24 is an arc-shaped, and the third support portion 24 is arranged coaxially with the intermediate conduit 1. A channel 12 is formed between the third supporting portions 24 of the two symmetrically arranged elastic supporting sheets 2. Figure 4The dotted circle represents the channel 12, through which the microcatheter 33 can pass. The first support part 21, the second support part 22, the third support part 24 and the wall of the lumen 11 are collectively arranged to form a flow hole 23, through which the contrast agent can flow. The two symmetrically arranged third support parts 24, which are arc-shaped, increase the clamping force of the elastic support sheet 2 on the microcatheter 33, while reducing the number of the elastic support sheets 2, increasing the gap 13, and facilitating the elastic deformation of the elastic support sheet 2.

[0051] Optional, such as Figure 1 , Figure 6 , Figure 7 As shown, when the number of the elastic support sheets 2 is two, the two elastic support sheets 2 are respectively located on both sides of the axis of the intermediate conduit 1, and the two elastic support sheets 2 are symmetrically arranged. In the present embodiment, the structures of the plurality of elastic support sheets 2 are the same, so the structure of one of the elastic support sheets 2 is taken as an example for introduction. The elastic support sheets 2 are integrally formed, and the elastic support sheet includes a first support portion 21, a second support portion 22 and a third support portion 24. One side of the first support portion 21 along its length direction is connected to one side of the third support portion 24 along its length direction, and one side of the second support portion 22 along its length direction is connected to the other side of the third support portion 24 along its length direction. The other side of the first support portion 21 along its length direction and the other side of the second support portion 22 along its length direction are both connected to the wall of the lumen 11, and the first support portion 21 and the second support portion 22 are symmetrically arranged. From Figure X It is observed that the height of the first support portion 21 is the same as the height of the second support portion 22. A second angle β is formed between the first support portion 21 and the second support portion 22, and the second angle β is 60° to 90°. The third support portion 24 is an arc-shaped sheet structure, and the cross-sectional shape of the third support portion 24 is an arc-shaped structure. The third support portion 24 is coaxially arranged with the intermediate conduit 1. A channel 12 is formed between the third support portions 24 of the two symmetrically arranged elastic support sheets 2, that is, Figure 6 The dotted circle represents the channel 12, through which the microcatheter 33 can pass. The first support portion 21, the second support portion 22, the third support portion 24 and the wall of the lumen 11 are collectively arranged to form a flow hole 23, through which the contrast agent can flow. The two symmetrically arranged third support portions 24, which are arc-shaped, increase the clamping force of the elastic support sheet 2 on the microcatheter 33, while reducing the number of the elastic support sheets 2 and increasing the gap 13. A second angle β is formed between the first support portion 21 and the second support portion 22, which is more conducive to the elastic deformation of the elastic support sheet 2.

[0052] You can choose any one of the above two technical solutions.

[0053] Third embodiment

[0054] This embodiment also proposes an enhanced intermediate conduit assembly. The third embodiment is a further improvement on the second embodiment, and the main improvement is that a guide piece 31 is further provided on the enhanced intermediate conduit assembly, as follows:

[0055] Alternatively, if Figure 8 , Fig. 9 As shown, the third support portion 24 of the elastic support sheet 2 is provided with a chamfer 25 at one end close to the proximal end, and such a configuration facilitates the end of the micro-catheter 33 close to the distal end to smoothly enter the channel 12 between the two elastic support sheets 2, that is, Fig. 9 The dotted circle represents the channel 12. When the microcatheter 33 enters the channel 12, a buffer space is formed between the outer tube wall of the microcatheter 33 and the chamfered surface 25, which can reduce the flow rate of the contrast agent during imaging.

[0056] Alternatively, if Figure 1 , Fig.10 , Fig.11 As shown, the enhanced intermediate catheter assembly also includes a plurality of guide pieces 31, and the plurality of guide pieces 31 are all arranged in the lumen 11 of the intermediate catheter 1, and the plurality of guide pieces 31 are all located at the end of the elastic support sheet 2 close to the proximal end. Because the plurality of guide pieces 31 have the same structure, and the connection method of the plurality of guide pieces 31 with the intermediate catheter 1 is also the same, the structure of one of the guide pieces 31 and the connection method with the intermediate catheter 1 are taken as an example for introduction. The guide piece 31 is an arc-shaped sheet structure, and the side length of one end of the guide piece 31 is longer than the side length of the other end. The end of the guide piece 31 with the longer side is arranged on the wall of the lumen 11 of the intermediate catheter 1, and the end of the guide piece 31 with the shorter side enters the channel 12 between the two symmetrically arranged elastic support sheets 2, as shown in FIG. Fig.11 The dotted circle represents the channel 12. A plurality of guide pieces 31 are evenly arranged around the axis of the intermediate catheter 1. Such an arrangement facilitates the micro-catheter 33 to first pass through the space formed between the plurality of guide pieces 31 for position calibration, and then smoothly enter the channel 12 between the two elastic support sheets 2. It can also reduce the flow rate of the contrast agent during angiography.

[0057] Optional, such as Figures 8 to 11As shown, of course, the above two optional technical solutions of this embodiment can also be combined. Among the multiple guide pieces 31, at least two guide pieces 31 have the shorter ends entering the channel 12 between the two elastic support sheets 2 and are located at the chamfer 25 of the elastic support sheet 2. When the microcatheter 33 enters the channel 12, the shorter end of the guide piece 31 can be bent toward the third support portion 24 and abut against the chamfer 25. Through such an arrangement, not only can the microcatheter 33 first pass through the space formed between the multiple guide pieces 31 for position calibration, and enter the channel 12 between the two elastic support sheets 2 more smoothly, but also can further reduce the flow rate of the contrast agent without affecting the circulation of the contrast agent during angiography.

[0058] In this embodiment, any one of the three optional technical solutions mentioned above can be selected.

[0059] Fourth embodiment

[0060] This embodiment also proposes an enhanced intermediate conduit assembly. The fourth embodiment is a further improvement based on the first, second or third embodiment, and the main improvements are:

[0061] Alternatively, if Figure 1 , Fig.12 , Fig.13 As shown, the elastic support sheet 2 also includes a first partition 26, which is located in the circulation hole 23, and the connection relationship between the elastic support sheet 2 and the first partition 26 is integrally formed. Specifically, one side of the first partition 26 along its length direction is connected to a side of the first support part 21 facing the second support part 22, and the connection between the two is located in the middle of the first support part 21. The other side of the first partition 26 along its length direction is connected to a side of the second support part 22 facing the first support part 21, and the connection between the two is located in the middle of the second support part 22. The first partition 26 divides the circulation hole 23 into two first circulation sub-holes 27, and the first support part 21, the second support part 22 and the first partition 26 are all provided with a shunt hole 28, so that the contrast agent in the first circulation sub-hole 27 and the contrast agent in the gap 13 can circulate through the shunt hole 28, which can alleviate the impact force caused by the contrast agent to the elastic support sheet 2 when it circulates.

[0062] Fifth embodiment

[0063] This embodiment also proposes an enhanced intermediate conduit assembly. The fifth embodiment is a parallel technical solution of the fourth embodiment, and the fifth embodiment is also a further improvement based on the second or third embodiment, and the main improvements are:

[0064] Alternatively, if Figure 1 , Figures 12 to 15As shown, the elastic support sheet 2 also includes a first partition 26 and a plurality of second partitions 29. The first partition 26 is located in the circulation hole 23, and the connection relationship between the elastic support sheet 2 and the first partition 26 is integrally formed. Specifically, one side of the first partition 26 along its length direction is connected to a side of the first support portion 21 facing the second support portion 22, and the connection between the two is located in the middle of the first support portion 21. The other side of the first partition 26 along its length direction is connected to a side of the second support portion 22 facing the first support portion 21, and the connection between the two is located in the middle of the second support portion 22. The first partition 26 divides the circulation hole 23 into two first circulation sub-holes 27.

[0065] The cross-sectional shape of the plurality of second partitions 29 is V-shaped, and the plurality of second partitions 29 are divided into two parts, one part of the second partitions 29 is located in a first circulation sub-hole 27, and the plurality of second partitions 29 located in the first circulation sub-hole 27 are connected end to end in sequence, and divide the first circulation sub-hole 27 into a plurality of second circulation sub-holes 30. One side of a second partition 29 close to the first support portion 21 is connected to the first support portion 21, or one side of a second partition 29 close to the first support portion 21 is connected to one side of the first partition 26 close to the first support portion 21. One side of a second partition 29 close to the second support portion 22 is connected to the second support portion 22, or one side of a second partition 29 close to the second support portion 22 is connected to one side of the first partition 26 close to the second support portion 22.

[0066] Another part of the second partitions 29 is located in another first circulation sub-hole 27, and the multiple second partitions 29 located in the first circulation sub-hole 27 are connected end to end in sequence, and the first circulation sub-hole 27 is divided into multiple second circulation sub-holes 30. One side of a second partition 29 close to the first support portion 21 is connected to the first support portion 21, or one side of a second partition 29 close to the first support portion 21 is connected to one side of the third support portion 24 close to the first support portion 21. One side of a second partition 29 close to the second support portion 22 is connected to the second support portion 22, or one side of a second partition 29 close to the second support portion 22 is connected to one side of the third support portion 24 close to the second support portion 22.

[0067] In this embodiment, the cross-sectional shape of all the second flow sub-holes 30 is triangular. The elastic support sheet 2 of such a structure is not only structurally stable, but also facilitates the movement of the third support portion 24 toward the wall of the lumen 11 of the intermediate catheter 1, thereby further expanding the diameter of the channel 12 and facilitating the adaptation of more micro-catheters 33 of different sizes.

[0068] Of course, in this embodiment, the first support portion 21, the second support portion 22 and the plurality of second partition portions 29 are all provided with diverter holes 28, which not only facilitates the circulation of the contrast agent in the plurality of second circulation sub-holes 30, but also facilitates the circulation of the contrast agent in the second circulation sub-holes 30 and the contrast agent in the gap 13 through the diverter holes 28, thereby alleviating the impact force on the elastic support sheet 2 caused by the circulation of the contrast agent.

[0069] Sixth embodiment

[0070] 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 improvement is that the thickness of the elastic support sheet 2 increases from the axis of the intermediate conduit 1 to the wall of the lumen 11, as follows:

[0071] Optionally, in the elastic support sheet 2, the first support portion 21 and the second support portion 22 have the same structure and are symmetrically arranged, and the thickness of the first support portion 21 at one end close to the axis of the intermediate catheter 1 gradually increases toward the thickness of the first support portion 21 at one end close to the wall of the lumen 11. That is, the thickness of the connection between the first support portion 21 and the second support portion 22 is the thinnest, and the thickness of the first support portion 21 and the second support portion 22 close to the wall of the lumen 11 is the thickest. Such an arrangement is more conducive to the elastic deformation of the elastic support sheet 2.

[0072] Optionally, the elastic support sheet 2 includes a first support portion 21, a second support portion 22, and a third support portion 24 disposed between the first support portion 21 and the second support portion 22. The thickness of the third support portion 24 is the thinnest, the first support portion 21 and the second support portion 22 have the same structure and are symmetrically disposed, the thickness of the first support portion 21 at one end close to the third support portion 24 increases successively toward the thickness of the first support portion 21 at one end close to the wall of the lumen 11, and the thickness of the first support portion 21 and the second support portion 22 close to the wall of the lumen 11 is the thickest. Such an arrangement is more conducive to the elastic deformation of the elastic support sheet 2. Of course, this optional technical solution can also be combined with the optional technical solution in which a second angle is formed between the first support portion 21 and the second support portion 22 in the second embodiment to further improve the performance of the elastic support sheet 2 and be more conducive to the elastic deformation of the elastic support sheet 2.

[0073] You can choose any one of the above two technical solutions.

[0074] Seventh embodiment

[0075] This embodiment also proposes an enhanced intermediate conduit assembly. The seventh embodiment is a further improvement based on any one of the first to sixth embodiments, and the main improvement is that the enhanced intermediate conduit assembly disclosed in this embodiment is further provided with a developing reinforcement net 32, as follows:

[0076] Optional, such as Figure 4 , Fig.16 , Fig.17 As shown, the developing reinforcement net 32 ​​is woven with developing wires, and the developing wires are made of any developing material such as platinum tungsten, platinum iridium, and tantalum. One end of the developing reinforcement net 32 ​​is arranged in the wall of the lumen 11 of the intermediate catheter 1. The other end of the developing reinforcement net 32 ​​is arranged in the elastic support sheet 2, and the developing reinforcement net 32 ​​is located at one end of the elastic support sheet 2 close to the wall of the lumen 11.

[0077] Optionally, in the fourth embodiment and the fifth embodiment, the diversion hole 28 is located at the mesh of the development reinforcement net 32, which facilitates the circulation of the contrast agent.

[0078] In this embodiment, the structural strength of the elastic support sheet 2 and the intermediate conduit 1 is further enhanced by providing the development reinforcement net 32. At the same time, it is also convenient for the elastic support sheet 2 to be developed, so that the operator can observe the position of the elastic support sheet 2 during the operation.

[0079] Eighth embodiment

[0080] 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:

[0081] like Figures 1 to 2 As shown, the delivery system includes an intermediate catheter 1, an elastic support sheet 2 and a microcatheter 33. The elastic support sheet 2 is arranged on the intermediate catheter 1 and is located in the lumen 11 of the intermediate catheter 1. The microcatheter 33 is arranged in the lumen 11 of the intermediate catheter 1, and the microcatheter 33 can move toward the distal end or the proximal end in the lumen 11 of the intermediate catheter 1. When the microcatheter 33 is located in the lumen 11, a plurality of elastic support sheets 2 simultaneously abut against the outer wall of the microcatheter 33 and clamp the microcatheter 33, which can facilitate the movement of the microcatheter 33 toward the distal end or the proximal end while preventing the microcatheter 33 from rotating, thereby improving the stability of the microcatheter 33 in the intermediate catheter 1. At the same time, when angiography is required, the contrast agent can circulate through the gap 13 and the circulation hole 23.

[0082] Application scenario of an exemplary embodiment:

[0083] like Figure 1 , Figure 6 , Figure 7As shown, when the microcatheter 33 is arranged in the lumen 11 of the intermediate catheter 1, at this time, the two symmetrically arranged elastic support sheets 2 are both in the original state. In the process of the microcatheter 33 moving toward the distal end, the end of the microcatheter 33 close to the distal end first contacts the two elastic support sheets 2. As the microcatheter 33 moves toward the distal end, the two elastic support sheets 2 undergo elastic deformation. At this time, the two symmetrically arranged elastic support sheets 2 clamp the microcatheter 33 and prevent the microcatheter 33 from rotating, thereby improving the stability of the microcatheter 33 in the intermediate catheter 1. At the same time, when angiography is required, the contrast agent can flow through the gap to facilitate angiography. Microcatheters 33 of different outer diameters can be adapted without replacing the intermediate catheter 1 component in the same operation.

[0084] 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 having a lumen in which the microcatheter can move; At least two elastic support sheets are located in the lumen and arranged on the lumen wall of the lumen; the elastic support sheets are made of polymer materials; the height of the elastic support sheets ranges from 0.25 mm to 0.5 mm; a flow hole for the flow of contrast medium is formed between the elastic support sheet and the lumen wall; a channel for the passage of a microcatheter is formed between at least two elastic support sheets; and a gap for the flow of contrast medium is formed between two adjacent elastic support sheets; At least two elastic support sheets form a group, and multiple groups of elastic support sheets are arranged in the tube cavity, and the multiple groups of elastic support sheets are arranged in sequence and spaced apart along the axis of the intermediate catheter; When in use, the elastic supporting sheet can be abutted by the micro-catheter to undergo elastic deformation.

2. The enhanced intermediate conduit assembly according to claim 1, characterized in that: When there are multiple elastic support sheets, the multiple elastic support sheets are evenly distributed around the axis of the intermediate conduit.

3. The enhanced intermediate conduit assembly according to claim 2, characterized in that: The elastic support sheet includes a first support portion and a second support portion, one side of the first support portion is connected to one side of the second support portion, and the other side of the first support portion and the other side of the second support portion are both connected to the lumen wall; a first angle is formed between the first support portion and the second support portion; A side surface of a connection between the first supporting portion and the second supporting portion facing the axis of the intermediate conduit is an arc surface, and the arc surface is coaxially arranged with the intermediate conduit.

4. The enhanced intermediate conduit assembly according to claim 1, characterized in that: When the number of the elastic supporting plates is two, the two elastic supporting plates are symmetrically arranged.

5. The enhanced intermediate conduit assembly according to claim 4, characterized in that: The elastic support sheet includes a first support portion, a second support portion and a third support portion, one side of the first support portion is connected to one side of the third support portion, one side of the second support portion is connected to the other side of the third support portion, and the other side of the first support portion and the other side of the second support portion are both connected to the lumen wall; the first support portion is arranged parallel to the second support portion; the third support portion is an arc-shaped sheet structure, and the third support portion is arranged coaxially with the intermediate conduit; A channel for the micro-catheter to pass through is formed between the third supporting parts of the two symmetrically arranged elastic supporting sheets.

6. The enhanced intermediate conduit assembly according to claim 4, characterized in that: The elastic support sheet includes a first support portion, a second support portion and a third support portion, one side of the first support portion is connected to one side of the third support portion, one side of the second support portion is connected to the other side of the third support portion, and the other side of the first support portion and the other side of the second support portion are both connected to the lumen wall; the first support portion and the second support portion are symmetrically arranged, and a second angle is formed between the first support portion and the second support portion; the third support portion is an arc-shaped sheet structure, and the third support portion is coaxially arranged with the intermediate conduit; A channel for the micro-catheter to pass through is formed between the third supporting parts of the two symmetrically arranged elastic supporting sheets.

7. The enhanced intermediate conduit assembly according to claim 5 or 6, characterized in that: Also includes: A plurality of guide plates are located in the lumen and at one end of the elastic support plate body close to the proximal end; the plurality of guide plates are evenly arranged around the axis of the intermediate conduit; One end of each of the guide plates is disposed on the lumen wall; the other ends of the guide plates enter the channel; the guide plates are arc-shaped plate structures, and the length of one end of the guide plates connected to the lumen wall is longer than the length of one end of the guide plates entering the channel.

8. The enhanced intermediate conduit assembly according to claim 7, characterized in that: One end of the third support portion close to the proximal end is provided with a chamfer; The other ends of at least two guide plates enter the channel and are located at the chamfered positions; When the micro-catheter enters the channel, the other end of the guide piece may be bent toward the third supporting portion and abut against the chamfer.

9. The enhanced intermediate conduit assembly according to claim 1, characterized in that: The elastic supporting sheet comprises: A first partition is located in the circulation hole, one side of the first partition is connected to the first supporting portion of the elastic supporting sheet, and the other side of the first partition is connected to the second supporting portion of the elastic supporting sheet; the first partition divides the circulation hole into two first circulation sub-holes; The first supporting part, the second supporting part and the first dividing part are all provided with diversion holes, so that the first flow sub-hole can flow with the contrast agent in the gap through the diversion holes.

10. The enhanced intermediate conduit assembly according to claim 1, characterized in that: The elastic supporting sheet comprises: A first partition is located in the circulation hole, one side of the first partition is connected to the first supporting portion of the elastic supporting sheet, and the other side of the first partition is connected to the second supporting portion of the elastic supporting sheet; the first partition divides the circulation hole into two first circulation sub-holes; A plurality of second partitions are respectively arranged in the two first flow sub-holes; the cross-sectional shape of the second partition is V-shaped, the plurality of second partitions respectively arranged in the two first flow sub-holes are sequentially connected end to end, and respectively divide the two first flow sub-holes into a plurality of second flow sub-holes, and the cross-sectional shape of the second flow sub-hole is triangular; The first supporting part, the second supporting part and the plurality of second partitioning parts are all provided with diversion holes, so that the second flow sub-holes can flow with the contrast agent in the gap through the diversion holes.

11. The enhanced intermediate conduit assembly according to claim 1, characterized in that: The thickness of the elastic support sheet increases gradually from the axis of the intermediate conduit toward the lumen wall.

12. A conveying system, characterized in that: include: A reinforced intermediate conduit assembly as claimed in any one of claims 1 to 11.

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