An intermediate catheter assembly and a delivery system

Abstract

The present invention relates to an intermediate catheter assembly, comprising: an intermediate catheter, the tube wall of which has at least one injection channel for contrast agent or saline to circulate; an anti-bending portion, which is arranged on the outer surface of the intermediate catheter; the anti-bending portion has a capsule cavity connected to the injection channel; the thickness of the capsule wall of the capsule cavity ranges from 0.02 mm to 0.05 mm; when the anti-bending portion is in a non-filled state, the anti-bending portion thickens the local wall of the intermediate catheter, which can enhance the local anti-bending performance of the intermediate catheter; contrast agent or saline is injected into the capsule cavity through the injection channel to form a buffer capsule, and the anti-bending portion is expanded and in a filled state, when the intermediate catheter is about to bend, the anti-bending portion in the filled state plays a buffering role under the bending pressure, so as to reduce the risk of the intermediate catheter being crushed or bent. The present invention also relates to a conveying system.

Description

Technical Field

[0001] The invention relates to the technical field of intermediate catheter components, and in particular to an intermediate catheter component and a conveying system. Background Art

[0002] The intermediate catheter assembly is one of the commonly used tools for interventional treatment, especially during thrombectomy and aneurysm surgery. The intermediate catheter assembly can provide distal support and provide support for the entry of other interventional materials.

[0003] Existing intermediate catheter components usually adopt a multi-layer composite structure to form a single-layer tube wall. When passing through a tortuous blood vessel, it may bend to form a closed lumen. Once this happens, the intermediate catheter component cannot be used any more and must be replaced with a new intermediate catheter component.

[0004] The existing intermediate catheter assembly has a softer texture at one end near the distal end and a harder texture at the other end near the proximal end. During the use of the intermediate catheter assembly, the distal end of the intermediate catheter assembly may be crushed due to improper operation by the operator, and the lumen of the intermediate catheter assembly may become smaller, making the catheter unusable. Such an intermediate catheter assembly cannot be used any more. Summary of the invention

[0005] The present invention provides an intermediate catheter assembly and a delivery system to solve the technical problems that the middle part of the existing intermediate catheter assembly is easily bent when passing through a tortuous blood vessel, resulting in a closed lumen, or the end of the intermediate catheter assembly close to the distal end is compressed, resulting in a smaller lumen and inability to be used normally.

[0006] The invention discloses an intermediate catheter component, which comprises an intermediate catheter and an anti-bending portion, wherein the tube wall of the intermediate catheter has at least one injection channel for contrast agent or physiological saline to flow; the anti-bending portion is arranged on the outer surface of the intermediate catheter; the anti-bending portion has a capsule cavity connected with the injection channel; the thickness of the capsule cavity wall ranges from 0.02 mm to 0.05 mm; contrast agent or physiological saline is injected into the capsule cavity through the injection channel to expand the capsule cavity to form a buffer capsule, thereby increasing the anti-bending performance of the intermediate catheter where the anti-bending portion is arranged.

[0007] Furthermore, the anti-bending portion is tubular or spiral, and the anti-bending portion at least covers a portion of the intermediate conduit.

[0008] Furthermore, there are multiple anti-bending portions, and the multiple anti-bending portions are distributed in a spiral shape around the axis of the intermediate conduit.

[0009] Furthermore, there are multiple anti-bending parts, and the multiple anti-bending parts are evenly arranged around the axis of the intermediate conduit.

[0010] Furthermore, there are multiple anti-bending parts, which are relatively arranged along the axis of the middle conduit.

[0011] Furthermore, there are multiple groups of anti-bending parts, which are arranged in sequence and at intervals along the axis of the intermediate conduit, and two adjacent groups of anti-bending parts are arranged crosswise.

[0012] Furthermore, the capsule wall of the capsule cavity includes a first subcapsule wall and a second subcapsule wall, the first subcapsule wall is located near the distal end, and the second subcapsule wall is located near the proximal end; the thickness of the first subcapsule wall is thinner than that of the second subcapsule wall.

[0013] Further, the outer surface of the first subcapsule wall is provided with a plurality of glue spots; and / or the outer surface of the second subcapsule wall is provided with a plurality of glue spots.

[0014] Furthermore, the material of the anti-bending part is made of any one of Pebax, PET, nylon or a mixture of the two.

[0015] The present invention also discloses a delivery system, which includes the intermediate catheter assembly as described in any one of the above embodiments.

[0016] The intermediate catheter assembly and delivery system provided by the present invention can achieve the following technical effects:

[0017] In this embodiment, the anti-bending portion has a non-filled state and a filled state, and both states improve the anti-bending performance of the intermediate conduit. The technical solution of this embodiment can make the wall of the intermediate conduit thinner, so that the intermediate conduit has better passability.

[0018] When the anti-bending portion is disposed on the outer surface of the intermediate catheter and no contrast agent is injected into the cavity of the anti-bending portion, the anti-bending portion is higher than the outer surface of the intermediate catheter. When the anti-bending portion is in such a non-filled state, the anti-bending portion thickens the local wall of the intermediate catheter, which can enhance the anti-bending performance of the local intermediate catheter. This is to enhance the anti-bending performance of the intermediate catheter when the anti-bending portion is in the non-filled state.

[0019] Of course, contrast agent can also be injected into the sac cavity of the anti-bending portion to form a buffer capsule, and the anti-bending portion is expanded and in a filled state. The anti-bending portion in the filled state is higher than the outer surface of the intermediate catheter. At this time, the hardness of the anti-bending portion in the filled state is increased and is harder than the hardness of the intermediate catheter. When the intermediate catheter is about to bend, the anti-bending portion in the filled state acts as a buffer under the bending pressure to reduce the risk of the intermediate catheter being crushed or bent.

[0020] 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

[0021] 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:

[0022] Figure 1 is a cross-sectional view of an embodiment of an intermediate conduit assembly of the present invention Figure 1 ;

[0023] Figure 2 is an exploded schematic diagram of an embodiment of an intermediate conduit assembly of the present invention;

[0024] Figure 3 is a cross-sectional view of an embodiment of an intermediate conduit assembly of the present invention Figure 2 ;

[0025] Figure 4 A partial cross-sectional view of an embodiment of an intermediate conduit assembly of the present invention Figure 1 ;

[0026] Figure 5 is a schematic diagram of an embodiment of an intermediate catheter assembly of the present invention Figure 1 ;

[0027] Figure 6 It is a cross-sectional schematic diagram of an embodiment of an intermediate catheter assembly of the present invention in a blood vessel;

[0028] Figure 7 is a schematic diagram of an embodiment of an intermediate catheter assembly of the present invention Figure 2 ;

[0029] Figure 8 is a schematic diagram of an embodiment of an intermediate catheter assembly of the present invention Figure 3 ;

[0030] Fig. 9 is a side view schematic diagram of an embodiment of an intermediate conduit assembly of the present invention;

[0031] Fig.10 A partial cross-sectional view of an embodiment of an intermediate conduit assembly of the present invention Figure 2 ;

[0032] Fig.11 A partial cross-sectional view of an embodiment of an intermediate conduit assembly of the present invention Figure 3 .

[0033] Reference numerals:

[0034] 1. Intermediate catheter; 11. Tube cavity; 12. Liquid injection channel; 13. Connecting hole; 14. Groove; 2. Anti-bending portion; 21. Capsule cavity; 22. First subcyst wall; 23. Second subcyst wall; 24. Glue point. DETAILED DESCRIPTION

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] Unless otherwise specified, the term "plurality" means two or more and "plurality" means two or more.

[0040] 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.

[0041] 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.

[0042] First embodiment

[0043] The intermediate conduit assembly mentioned in this embodiment, such as Figure 1 As shown, the intermediate catheter assembly includes an intermediate catheter 1 and an anti-bending portion 2. The intermediate catheter 1 has a lumen 11, and the lumen 11 of the intermediate catheter 1 can allow a microcatheter to pass through. The intermediate catheter 1 has at least one injection channel 12 in its closure, and the injection channel 12 can allow contrast agent or saline to flow. The anti-bending portion 2 is arranged on the outer surface of the intermediate catheter 1, and the anti-bending portion 2 has a capsule cavity 21, and the capsule cavity 21 is connected to the injection channel 12 on the intermediate catheter 1 through a connecting hole 13. The thickness of the capsule wall of the capsule cavity 21 ranges from 0.02 mm to 0.05 mm. By controlling the thickness of the capsule wall of the capsule cavity 21, the elastic force of the anti-bending portion 2 is optimized, and the anti-bending performance of the intermediate catheter 1 is improved.

[0044] Optional, such as Figure 2 As shown, the outer surface of the intermediate conduit 1 has a groove 14 that matches the shape of the anti-bending portion 2, and the bottom of the groove 14 has a connecting hole 13 that is connected to the injection channel 12. The anti-bending portion 2 is arranged in the groove 14, so that the anti-bending portion 2 can be flat with the outer surface of the intermediate conduit 1 in a non-filled state, that is, the anti-bending portion 2 is not higher than the outer surface of the intermediate conduit 1. At the same time, the hardness of the portion of the intermediate conduit 1 provided with the anti-bending portion 2 can be the same as the hardness of the portion of the intermediate conduit 1 not provided with the anti-bending portion 2.

[0045] In this embodiment, if contrast agent is used, it is convenient for the operator to observe the situation of the intermediate catheter 1 in the blood vessel. When the cyst cavity 21 of the late anti-bending portion 2 ruptures, the contrast agent enters the blood vessel, which is also convenient for human metabolism and avoids damage to the human body. Similarly, if physiological saline is used, when the cyst cavity 21 of the late anti-bending portion 2 ruptures, the physiological saline enters the blood vessel, which may increase the frequency of urination and avoid damage to the human body. In the present invention, contrast agent is used as an example for description.

[0046] In this embodiment, the anti-bending portion 2 has a non-filled state and a filled state, and both states improve the anti-bending performance of the intermediate conduit 1. The technical solution of this embodiment can make the wall of the intermediate conduit 1 thinner, so that the intermediate conduit 1 has better passability.

[0047] When the anti-bending portion 2 is disposed on the outer surface of the intermediate catheter 1 and no contrast agent is injected into the cavity 21 of the anti-bending portion 2, the anti-bending portion 2 is higher than the outer surface of the intermediate catheter 1. When the anti-bending portion 2 is in this non-filled state, the anti-bending portion 2 thickens the local wall of the intermediate catheter 1, which can enhance the local anti-bending performance of the intermediate catheter 1. This is the anti-bending portion 2 in the non-filled state to enhance the anti-bending performance of the intermediate catheter 1.

[0048] Of course, contrast agent can also be injected into the sac cavity 21 of the anti-bending portion 2 to form a buffer sac, and the anti-bending portion 2 is expanded and in a filled state. The anti-bending portion 2 in the filled state is higher than the outer surface of the intermediate catheter 1. At this time, the hardness of the anti-bending portion 2 in the filled state is increased and is harder than the hardness of the intermediate catheter 1. When the intermediate catheter 1 is about to bend, the anti-bending portion 2 in the filled state plays a buffering role under the bending pressure, so as to reduce the risk of the intermediate catheter 1 being crushed or bent.

[0049] Specifically, there are two ways to use the anti-bending portion 2. The first is to directly inject contrast agent into the cavity 21 of the anti-bending portion 2 through the injection channel 12, which can increase the anti-bending performance of the intermediate catheter 1 where the anti-bending portion 2 is provided, which is to prevent the intermediate catheter 1 from being crushed or bent. The second is that in the case where the intermediate catheter assembly has been bent through a tortuous blood vessel and the lumen 11 has been closed, the contrast agent can be slowly injected into the cavity 21 of the anti-bending portion 2 through the injection channel 12, and the contrast agent can slowly expand the bent portion. At this time, as the bent portion expands, the two ends of the bent portion of the intermediate catheter 1 can be straightened to solve the problem of the closed lumen 11.

[0050] The above technical solution can enhance the anti-bending performance of the intermediate conduit 1, and can also optimize the shape and arrangement of the anti-bending portion 2 to further enhance the anti-bending performance of the intermediate conduit 1, as follows:

[0051] Optional, such as Figure 1 As shown, the anti-bending portion 2 is tubular, and the tubular anti-bending portion 2 is sleeved on the entire intermediate catheter 1 and covers the entire intermediate catheter 1. Such a configuration can enhance the anti-bending performance of the entire intermediate catheter 1, and such a configuration is suitable for tortuous blood vessels with many turns.

[0052] Optional, such as Figure 3As shown, the anti-bending portion 2 is tubular, and the tubular anti-bending portion 2 is sleeved on the intermediate catheter 1, and covers a part of the intermediate catheter 1. Of course, multiple anti-bending portions 2 can also be set on the intermediate catheter 1, and the multiple anti-bending portions 2 are arranged in sequence along the axis of the intermediate catheter 1. Such an arrangement can enhance the anti-bending performance of multiple sections of the intermediate catheter 1. Such an arrangement is more suitable for tortuous blood vessels with more turns and is more targeted. When the intermediate catheter 1 needs to turn in the blood vessel, in order to avoid the intermediate catheter 1 from bending, it is only necessary to fill the anti-bending portion 2 with contrast agent, and make the anti-bending portion 2 in a filled state. The anti-bending portion 2 in a filled state increases the flexibility and anti-bending performance of the intermediate catheter 1, allowing the intermediate catheter 1 to pass smoothly through the turning of the blood vessel.

[0053] Optional, such as Figure 4 As shown, the anti-bending portion 2 is spiral, and the spiral anti-bending portion 2 is sleeved on the intermediate catheter 1 and covers a part of the intermediate catheter 1. Of course, multiple spiral anti-bending portions 2 can also be set on the intermediate catheter 1, and the multiple anti-bending portions 2 are arranged in sequence along the axis of the intermediate catheter 1. Compared with the above-mentioned technical solution of using the anti-bending portion 2 to cover the entire intermediate catheter 1, such a setting can also enhance the anti-bending performance of multiple sections of the intermediate catheter 1, and is suitable for tortuous blood vessels with more turns. When the intermediate catheter 1 needs to turn in the blood vessel, in order to avoid the intermediate catheter 1 from bending, it is only necessary to fill the anti-bending portion 2 with contrast agent, and make the anti-bending portion 2 in a filled state. The anti-bending portion 2 in a filled state increases the flexibility and anti-bending performance of the intermediate catheter 1, and allows the intermediate catheter 1 to pass smoothly through the turning of the blood vessel. In this technical solution, the spiral anti-bending portion 2 not only ensures its anti-bending performance, but also saves materials and reduces manufacturing costs.

[0054] Optional, such as Figure 5 As shown, the anti-bending portion 2 is block-shaped. The anti-bending portion 2 can be square or round. In the present embodiment, as long as the anti-bending portion 2 is block-shaped, the block shape of the anti-bending portion 2 is not further limited. In the present embodiment, there are multiple anti-bending portions 2, and the multiple anti-bending portions 2 are spirally distributed around the axis of the intermediate conduit 1. Compared with the above-mentioned technical solution of the spiral anti-bending portion 2, the multiple block-shaped anti-bending portions 2 are spirally distributed around the axis of the intermediate conduit 1, which can not only increase the anti-bending performance of the intermediate conduit 1, but also make the use of the anti-bending portion 2 more targeted. Figure 6 The figure shows a blood vessel that bends to the right. In this case, the end of the intermediate catheter 1 close to one end also bends to the right along with the blood vessel. Figure 6The middle dotted line indicates the bending area of ​​the blood vessel. The section of the intermediate catheter 1 located in the bending area belongs to the bending portion. The multiple anti-bending portions 2 on the bending portion cooperate with each other to enhance the anti-bending performance of the bending portion of the intermediate catheter 1. Specifically, the contrast agent is filled into the cavity 21 of the anti-bending portion 2 located on the left side of the intermediate catheter 1, and the contrast agent fills the cavity 21 so that the anti-bending portion 2 expands and is in a filled state. At the same time, the contrast agent is filled into the cavity 21 of the anti-bending portion 2 located on the right side of the intermediate catheter 1, and the contrast agent fills half of the cavity 21 so that the anti-bending portion 2 expands and is in a half-filled state. At the same time, the anti-bending portion 2 on one side of the intermediate catheter 1 is in a filled state, and the anti-bending portion 2 on the other side of the intermediate catheter 1 is in a half-filled state. Such cooperation can make the bending section of the intermediate catheter 1 tough and improve the anti-bending ability of the catheter.

[0055] Optional, such as Figure 7 As shown, the anti-bending portion 2 is block-shaped, and there are multiple anti-bending portions 2, and the multiple anti-bending portions 2 are arranged relatively along the axis of the intermediate catheter 1. A part of the anti-bending portion 2 is arranged on one side of the intermediate catheter 1, and another part of the anti-bending portion 2 is arranged on the other side of the intermediate catheter 1, so that both sides of the intermediate catheter 1 can be thickened to improve the anti-bending performance of the intermediate catheter 1. Such a setting not only ensures its anti-bending performance, but also saves materials, reduces manufacturing costs, and is more suitable for continuous turning and tortuous blood vessels.

[0056] Optional, such as Figure 8 , Fig. 9 As shown, there are multiple groups of anti-bending parts 2, and the multiple groups of anti-bending parts 2 are arranged in sequence along the axis of the intermediate conduit 1, and two adjacent groups of anti-bending parts 2 are arranged crosswise. Each group of anti-bending parts 2 includes multiple anti-bending parts 2, and the anti-bending parts 2 are block-shaped, and the multiple anti-bending parts 2 are evenly arranged around the axis of the intermediate conduit 1. When the intermediate conduit 1 is in the bending area of ​​the blood vessel, the bending force on the bending part of the intermediate conduit 1 can be buffered by the coordination between the multiple groups of anti-bending parts 2 in the bending part being in the filled state and the semi-filled state, thereby avoiding the risk of bending of the bending part and enhancing the anti-bending performance of the intermediate conduit 1.

[0057] In the above optional technical solution, when there are multiple anti-bending parts 2, the number of injection channels 12 is the same as the number of anti-bending parts 2. Each anti-bending part 2 is connected to one injection channel 1. In this way, the phenomenon of multiple anti-bending parts 2 expanding through one injection channel 1 can be avoided.

[0058] You can select any one of the above optional technical solutions.

[0059] Of course, in addition to the technical solution of covering the entire intermediate catheter 1 with the anti-bending portion 2, other optional technical solutions have another effect, specifically, the operator can selectively fill multiple bending portions according to the specific situation during the operation. For example, when the intermediate catheter 1 passes through the first turn of the blood vessel, the operator can only fill the anti-bending portion 2 in the bending area of ​​the blood vessel. When the anti-bending portion 2 has passed the first turn, the operator can drain the already filled anti-bending portion 2 and make the anti-bending portion 2 in a non-filled state. And refill the next anti-bending portion 2 in the bending area of ​​the blood vessel. Such a setting makes the operator's operation more flexible and more targeted.

[0060] Second embodiment

[0061] This embodiment also proposes an intermediate catheter assembly. The second embodiment is a further improvement on the first embodiment. The improvement lies in the structure of the sac wall of the sac cavity 21, which is as follows:

[0062] Optional, such as Fig.10 As shown, the material of the anti-bending part 2 is made of any one of Pebax, PET, nylon or a mixture of the two, and the softness of the anti-bending part 2 is softer than that of the intermediate catheter 1. The capsule wall of the capsule cavity 21 includes a first sub-capsule wall 22 and a second sub-capsule wall 23. The first sub-capsule wall 22 is arranged near the distal end of the anti-bending part 2, and the second sub-capsule wall 23 is arranged near the proximal end of the anti-bending part 2. The thickness of the first sub-capsule wall 22 ranges from 0.02 mm to 0.03 mm, and the thickness of the second sub-capsule wall 23 ranges from 0.04 mm to 0.05 mm. The connection between the two is uniformly transitioned from the first sub-capsule wall 22 to the second sub-capsule wall 23, and the thickness of the first sub-capsule wall 22 is thinner than that of the second sub-capsule wall 23.

[0063] Optional, such as Fig.11 As shown, this optional technical solution is a further improvement of the above optional technical solution. The thickness of the first subcapsule wall 22 near the distal end ranges from 0.02 mm to 0.03 mm, the thickness of the second subcapsule wall 23 near the proximal end ranges from 0.04 mm to 0.05 mm, and the thickness of the capsule wall of the capsule cavity 21 gradually increases from the end of the first subcapsule wall 22 near the distal end to the end of the second subcapsule wall 23 near the proximal end.

[0064] You can choose any one of the two optional technical solutions mentioned above.

[0065] In this embodiment, the above-mentioned technical solution can make the intermediate catheter assembly of this embodiment have two effects. The first effect is that the first sub-capsule wall 22 of the anti-bending part 2 in the non-filled state is close to the distal end and the first sub-capsule wall 22 is thinner than the second sub-capsule wall 23, and combined with the material of the anti-bending part, the flexibility of the intermediate catheter 1 is better and it is easier to fit the inner wall of the blood vessel. The second effect is that in order to reduce the damage to the blood vessel, it is necessary to slowly inject contrast agent into the capsule cavity 21, and with the slow injection of contrast agent, the capsule cavity 21 near the first sub-capsule wall 22 is easier to expand, so that the expansion effect is better than that of the capsule wall with the same wall thickness.

[0066] Third embodiment

[0067] This embodiment also proposes an intermediate conduit assembly. The third embodiment is a further improvement based on the second embodiment, and is specifically as follows:

[0068] Optional, such as Fig.11 As shown, the outer surface of the first subcapsule wall 22 is provided with a plurality of hemispherical glue dots 24. The glue dots 24 are made of Pebax, PET, nylon or a mixture of the two, which can ensure that the softness of the glue dots 24 is the same as that of the anti-bending portion 2.

[0069] Optional, such as Fig.11 As shown, the outer surface of the second subcapsule wall 23 is provided with a plurality of hemispherical glue dots 24. The glue dots 24 are made of any one of Pebax, PET, and nylon or a mixture of the two, which can ensure that the softness of the glue dots 24 is the same as that of the anti-bending portion 2.

[0070] Optional, such as Fig.11 As shown, the above two technical solutions can also be integrated, and the outer surface of the first subcapsule wall 22 and the outer surface of the second subcapsule wall 23 are both provided with a plurality of hemispherical glue dots 24. The material of the glue dots 24 is any one of Pebax, PET, and nylon or a mixture of the two, which can ensure that the softness of the glue dots 24 is the same as the softness of the anti-bending part 2.

[0071] Any one of the above three optional technical solutions can be selected. Compared with the prior art, the outer surface of the anti-bending portion 2 of the intermediate catheter assembly disclosed in this embodiment has a glue point 24. When the intermediate catheter 1 stops moving in the blood vessel, the anti-bending portion 2 of the intermediate catheter 1 in the blood vessel bending area is filled with contrast agent, and the anti-bending portion 2 is in a filled state. At this time, the glue point 24 of the anti-bending portion 2 can contact the inner wall of the blood vessel, act as an anchor point, increase the stability of the intermediate catheter 1 in the blood vessel, and facilitate other operations of the operator.

[0072] Fourth embodiment

[0073] The present invention further discloses a delivery system (not shown in the figure). The delivery system disclosed in the fourth embodiment includes the intermediate catheter assembly in any one of the first to third embodiments.

[0074] 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 intermediate conduit assembly, characterized in that: include: The intermediate catheter (1) has a tube wall having at least one injection channel (12) through which contrast medium or physiological saline can flow; The anti-bending portion (2) is arranged on the outer surface of the intermediate conduit (1); the anti-bending portion (2) has a capsule cavity (21) connected to the injection channel (12); the thickness of the capsule wall of the capsule cavity (21) ranges from 0.02 mm to 0.05 mm; The capsule wall of the capsule cavity (21) comprises a first subcyst wall (22) and a second subcyst wall (23), the first subcyst wall (22) is located near the distal end, and the second subcyst wall (23) is located near the proximal end; the thickness of the first subcyst wall (22) is thinner than the thickness of the second subcyst wall (23); The outer surface of the intermediate conduit (1) has a groove (14) matched with the shape of the anti-bending portion (2); the bottom of the groove (14) has a connecting hole (13) connected to the injection channel (12); the capsule cavity (21) is connected to the injection channel (12) on the intermediate conduit (1) through the connecting hole (13); the anti-bending portion (2) is arranged in the groove (14); By injecting contrast agent or physiological saline into the cystic cavity (21) through the injection channel (12), the cystic cavity (21) expands to form a buffer sac, thereby increasing the anti-bending performance of the intermediate catheter (1) at the anti-bending portion (2).

2. The intermediate conduit assembly according to claim 1, characterized in that: The anti-bending portion (2) is tubular or spiral, and the anti-bending portion (2) at least covers a portion of the intermediate conduit (1).

3. The intermediate conduit assembly according to claim 1, characterized in that: The number of the anti-bending parts (2) is multiple, and the multiple anti-bending parts (2) are distributed in a spiral shape around the axis of the intermediate conduit (1).

4. The intermediate conduit assembly according to claim 1, characterized in that: The number of the anti-bending parts (2) is multiple, and the multiple anti-bending parts (2) are evenly arranged around the axis of the intermediate conduit (1).

5. The intermediate conduit assembly according to claim 1, characterized in that: The number of the anti-bending parts (2) is plural, and the plural anti-bending parts (2) are arranged relatively along the axis of the intermediate conduit (1).

6. The intermediate conduit assembly according to claim 1, characterized in that: The anti-bending parts (2) are provided in a plurality of groups, and the plurality of groups of anti-bending parts (2) are arranged in sequence and at intervals along the axis of the intermediate conduit (1), and two adjacent groups of anti-bending parts (2) are arranged crosswise.

7. The intermediate conduit assembly according to claim 1, characterized in that: The outer surface of the first subcapsule wall (22) is provided with a plurality of glue dots (24); and / or the outer surface of the second subcapsule wall (23) is provided with a plurality of glue dots (24).

8. The intermediate conduit assembly according to claim 1, characterized in that: The material of the anti-bending part (2) is any one of Pebax, PET, and nylon, or a mixture of the two.

9. A conveying system, characterized in that: include: An intermediate conduit assembly as claimed in any one of claims 1 to 8.

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