CN118662754A - Intermediate catheter assembly and conveying system - Google Patents

Abstract

The present invention relates to an intermediate catheter assembly comprising: the tube wall of the middle catheter is provided with at least one liquid injection channel for the circulation of contrast medium or physiological saline; the bending resistance part is arranged on the outer surface of the middle catheter; the bending-resistant part is provided with a sac cavity communicated with the liquid injection channel; the thickness of the wall of the capsule cavity is 0.02 mm-0.05 mm; when the bending-resistant part is in a non-filling state, the bending-resistant part thickens part of the pipe wall of the middle pipe, so that the bending resistance of part of the middle pipe can be enhanced; the contrast agent or the normal saline is injected into the capsule cavity through the liquid injection channel to form the buffer capsule, the bending-resistant part is expanded and is in a filling state, and when the middle catheter is about to bend, the bending-resistant part in the filling state plays a role in buffering under bending pressure, so that the risk that the middle catheter is crushed or bent is reduced. The invention also relates to a conveying system.

Description

An intermediate catheter assembly and a delivery system

Technical Field

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

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.

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.

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 operator's improper operation may cause the distal end of the intermediate catheter assembly to collapse, causing the lumen of the intermediate catheter assembly to become smaller, making the catheter unusable. Such an intermediate catheter assembly cannot be used any more.

Summary of the invention

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.

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.

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

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.

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

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

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.

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.

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.

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

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

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

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.

When the anti-bending portion is disposed on the outer surface of the intermediate catheter and contrast medium is not 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.

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.

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

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:

FIG1 is a cross-sectional schematic diagram of an embodiment of an intermediate conduit assembly of the present invention;

FIG2 is an exploded schematic diagram of an embodiment of an intermediate conduit assembly of the present invention;

FIG3 is a second cross-sectional schematic diagram of an embodiment of an intermediate conduit assembly of the present invention;

FIG4 is a partial cross-sectional schematic diagram of an embodiment of an intermediate conduit assembly of the present invention;

FIG5 is a schematic diagram of an embodiment of an intermediate conduit assembly of the present invention;

FIG6 is a cross-sectional schematic diagram of an embodiment of an intermediate catheter assembly of the present invention being located within a blood vessel;

FIG7 is a second schematic diagram of an embodiment of an intermediate conduit assembly of the present invention;

FIG8 is a third schematic diagram of an embodiment of an intermediate conduit assembly of the present invention;

FIG9 is a side view of an embodiment of an intermediate conduit assembly of the present invention;

FIG10 is a second partial cross-sectional schematic diagram of an embodiment of an intermediate conduit assembly of the present invention;

FIG. 11 is a third partial cross-sectional schematic diagram of an embodiment of an intermediate conduit assembly of the present invention.

Reference numerals:

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

DETAILED DESCRIPTION

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.

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 herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

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.

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.

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

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.

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.

First embodiment

The intermediate catheter assembly mentioned in this embodiment, as shown in FIG1 , 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 circulate. The anti-bending portion 2 is arranged on the outer surface of the intermediate catheter 1, and the anti-bending portion 2 has a sac cavity 21, and the sac cavity 21 is connected to the injection channel 12 on the intermediate catheter 1 through a connecting hole 13. The thickness of the sac wall of the sac cavity 21 ranges from 0.02 mm to 0.05 mm. By controlling the thickness of the sac wall of the sac 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.

Optionally, as shown in FIG2 , the outer surface of the intermediate conduit 1 has a groove 14 that matches the shape of the anti-bending portion 2, the bottom of the groove 14 has a connecting hole 13 that is connected to the injection channel 12, and 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 also be made the same as the hardness of the portion of the intermediate conduit 1 not provided with the anti-bending portion 2.

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.

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.

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.

Of course, contrast agent can also be injected into the sac cavity 21 of the anti-bending portion 2 to form a buffer capsule, 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.

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.

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:

Optionally, as shown in Fig. 1, the anti-bending portion 2 is tubular, and the tubular anti-bending portion 2 is sleeved on the entire intermediate conduit 1 and covers the entire intermediate conduit 1. Such a configuration can enhance the anti-bending performance of the entire intermediate conduit 1, and such a configuration is suitable for tortuous blood vessels with many turns.

Optionally, as shown in FIG3 , the anti-bending portion 2 is tubular, and the tubular anti-bending portion 2 is sleeved on the intermediate catheter 1, and covers a portion of the intermediate catheter 1. Of course, multiple anti-bending portions 2 can also be provided 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, and 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 bend of the blood vessel.

Optionally, as shown in FIG4 , the anti-bending portion 2 is spirally shaped, and the spirally shaped anti-bending portion 2 is sleeved on the intermediate conduit 1, and covers a part of the intermediate conduit 1. Of course, multiple spirally shaped anti-bending portions 2 can also be arranged on the intermediate conduit 1, and the multiple anti-bending portions 2 are arranged in sequence along the axis of the intermediate conduit 1. Compared with the above-mentioned technical solution of using the anti-bending portion 2 to cover the entire intermediate conduit 1, such a setting can also enhance the anti-bending performance of multiple sections of the intermediate conduit 1, and is suitable for tortuous blood vessels with more turns. When the intermediate conduit 1 needs to turn in the blood vessel, in order to avoid the intermediate conduit 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 conduit 1, and allows the intermediate conduit 1 to pass smoothly through the turning of the blood vessel. In this technical solution, the spirally shaped anti-bending portion 2 not only ensures its anti-bending performance, but also saves materials and reduces manufacturing costs.

Optionally, as shown in FIG5 , 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, the number of the anti-bending portions 2 is multiple, and the multiple anti-bending portions 2 are spirally distributed around the axis of the intermediate conduit 1. Compared with the technical solution of the above-mentioned 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. As shown in FIG6 , a blood vessel that bends to the right is shown. When facing this situation, the end of the intermediate conduit 1 close to one end also bends to the right along with the blood vessel. The dotted line in FIG6 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 sac cavity 21 of the anti-bending portion 2 located on the left side of the intermediate catheter 1, and the contrast agent fills the sac 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 sac 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 space of the sac 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.

Optionally, as shown in FIG7 , the anti-bending portion 2 is block-shaped, and the number of the anti-bending portions 2 is multiple, and the multiple anti-bending portions 2 are respectively 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 an arrangement 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.

Optionally, as shown in FIG8 and FIG9, the number of the anti-bending parts 2 is multiple groups, 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.

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.

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

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.

Second embodiment

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:

Optionally, as shown in FIG10 , the material of the anti-bending portion 2 is made of any one of Pebax, PET, and nylon or a mixture of the two, and the softness of the anti-bending portion 2 is softer than that of the intermediate catheter 1. The capsule wall of the capsule cavity 21 includes a first subcapsule wall 22 and a second subcapsule wall 23, the first subcapsule wall 22 is arranged near the distal end of the anti-bending portion 2, and the second subcapsule wall 23 is arranged near the proximal end of the anti-bending portion 2, the thickness of the first subcapsule wall 22 ranges from 0.02 mm to 0.03 mm, the thickness of the second subcapsule wall 23 ranges from 0.04 mm to 0.05 mm, and the connection between the two is uniformly transitioned from the first subcapsule wall 22 to the second subcapsule wall 23, and the thickness of the first subcapsule wall 22 is thinner than the thickness of the second subcapsule wall 23.

Optionally, as shown in FIG11 , this optional technical solution is a further improvement of the above optional technical solution. The thickness of the end of the first subcapsule wall 22 close to the distal end is in the range of 0.02 mm to 0.03 mm, and the thickness of the end of the second subcapsule wall 23 close to the proximal end is in the range of 0.04 mm to 0.05 mm. The thickness of the capsule wall of the capsule cavity 21 gradually increases from the end of the first subcapsule wall 22 close to the distal end to the end of the second subcapsule wall 23 close to the proximal end.

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

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, the contrast agent needs to be slowly injected into the capsule cavity 21, and with the slow injection of the 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.

Third embodiment

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:

Optionally, as shown in Fig. 11, a plurality of hemispherical glue dots 24 are provided on the outer surface of the first subcapsule wall 22. 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.

Optionally, as shown in Fig. 11, a plurality of hemispherical glue dots 24 are provided on the outer surface of the second subcapsule wall 23. 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.

Optionally, as shown in FIG11 , the above two technical solutions can 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 portion 2.

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.

Fourth embodiment

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.

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 (10)

1. An intermediate catheter assembly, comprising:

an intermediate catheter (1) with a wall provided with at least one liquid injection channel (12) for the circulation of contrast medium or physiological saline;

A bending-resistant portion (2) provided on the outer surface of the intermediate duct (1); the bending-resistant part (2) is provided with a sac cavity (21) communicated with the liquid injection channel (12); the thickness of the capsule wall of the capsule cavity (21) is 0.02 mm-0.05 mm;

the contrast agent or the normal saline is injected into the capsule cavity (21) through the liquid injection channel (12) so that the capsule cavity (21) is expanded to form a buffer capsule, and the bending resistance performance of the position of the middle catheter (1) provided with the bending resistance part (2) can be improved.

2. The intermediate catheter assembly of claim 1, wherein the intermediate catheter assembly comprises,

The bending-resistant part (2) is tubular or spiral, and the bending-resistant part (2) at least covers a part of the middle catheter (1).

3. The intermediate catheter assembly of claim 1, wherein the intermediate catheter assembly comprises,

The number of the bending resistance parts (2) is multiple, and the bending resistance parts (2) are spirally distributed around the axis of the middle catheter (1).

4. The intermediate catheter assembly of claim 1, wherein the intermediate catheter assembly comprises,

The number of the bending resistance parts (2) is multiple, and the bending resistance parts (2) are uniformly distributed around the axis of the middle catheter (1).

5. The intermediate catheter assembly of claim 1, wherein the intermediate catheter assembly comprises,

The number of the bending resistance parts (2) is multiple, and the bending resistance parts (2) are respectively arranged oppositely along the axis of the middle catheter (1).

6. The intermediate catheter assembly of claim 1, wherein the intermediate catheter assembly comprises,

The number of the bending-resistant parts (2) is multiple, the bending-resistant parts (2) are sequentially arranged at intervals along the axis of the middle catheter (1), and two adjacent bending-resistant parts (2) are arranged in a crossing mode.

7. The intermediate catheter assembly as defined in any one of claims 1-6, wherein,

The capsule wall of the capsule cavity (21) comprises a first sub-capsule wall (22) and a second sub-capsule wall (23), the first sub-capsule wall (22) is positioned near the far end, and the second sub-capsule wall (23) is positioned near the near end; the thickness of the first ascal wall (22) is thinner than the thickness of the second ascal wall (23).

8. The intermediate catheter assembly as recited in claim 7, wherein,

The outer surface of the first ascus wall (22) is provided with a plurality of glue points (24); and/or, the outer surface of the second ascus wall (23) is provided with a plurality of glue points (24).

9. The intermediate catheter assembly of claim 1, wherein the intermediate catheter assembly comprises,

The bending-resistant part (2) is made of one or two of Pebax, PET and nylon.

10. A delivery system, comprising:

An intermediate catheter assembly as claimed in any one of claims 1 to 9.