CN114010921A

CN114010921A - Extension guide catheter

Info

Publication number: CN114010921A
Application number: CN202111507174.3A
Authority: CN
Inventors: 张鹏涛; 陈晓艺; 罗***
Original assignee: Insight Lifetech Co Ltd
Current assignee: Insight Lifetech Co Ltd
Priority date: 2021-12-10
Filing date: 2021-12-10
Publication date: 2022-02-08
Also published as: WO2023103541A1

Abstract

The present application relates to an extension guide catheter. The extension guiding catheter comprises an operation interface, a pushing part and a catheter which are sequentially connected from a near end to a far end; wherein, the catheter is provided with a channel which is communicated along the axial direction and is used for conveying the instrument; the periphery of the catheter is wound with a balloon, and the balloon is in fluid communication with the operation interface; the pushing part is provided with a connecting part for connecting the operation interface with the catheter, and comprises a flow channel for fluidly communicating the operation interface with the balloon, and at least part of the connecting part is embedded in the flow channel. The scheme that this application provided has reduced the radial maximum dimension of propelling movement portion, more does benefit to the transport of apparatuses such as seal wire, microcatheter.

Description

Extension guide catheter

Technical Field

The present application relates to the technical field of medical equipment, and in particular, to an extension guide catheter.

Background

Percutaneous Coronary Intervention (PCI) surgery refers to a treatment method for improving myocardial perfusion by opening a narrow or even an occluded coronary artery lumen through a cardiac catheter technique. The operation has the advantages of short course of treatment, small wound, remarkable curative effect and the like, and is developed rapidly in recent years.

In the related art, in the percutaneous coronary intervention, a guide wire, a microcatheter, or other device is pushed from an extension guide catheter to a desired position in a coronary artery, however, since the radial dimension of the pushing portion of the extension guide catheter in the related art is too large, the delivery of the guide wire, the microcatheter, or other device is not facilitated, and thus, the difficulty of the operation is increased.

Disclosure of Invention

In order to solve or partially solve the problems existing in the related art, the application provides the extension guide catheter, which can reduce the radial maximum size of the pushing part and is more beneficial to conveying of instruments such as guide wires, micro-catheters and the like.

A first aspect of the present application provides an elongate guiding catheter comprising:

the operation interface, the pushing part and the catheter are sequentially connected from the near end to the far end;

wherein the catheter is provided with a channel which is communicated along the axial direction and is used for conveying the instrument;

a balloon is wound on the periphery of the catheter, and the balloon is in fluid communication with the operation interface;

the pushing part is provided with a connecting part for connecting the operation interface with the catheter, and comprises a flow channel for fluidly communicating the operation interface with the balloon, and at least part of the connecting part is embedded in the flow channel.

In one implementation, the connecting member includes a first tube;

the flow passage is formed by the first pipe body and a second pipe body connected with the first pipe body;

wherein at least part of the first pipe body is embedded in the second pipe body.

In one implementation, the first tube includes an insertion portion inserted into the second tube, and the insertion portion is provided with a flow port in fluid communication with the second tube.

In one implementation, the connecting component comprises a first tube and a connecting rod which are connected in the axial direction;

wherein, at least part of the first pipe body and at least part of the connecting rod are embedded in the second pipe body.

In one implementation, the first pipe body includes an insertion part inserted into the second pipe body;

the first pipe body is connected with the connecting rod through the inserting part, and the inserting part is provided with a circulation port which is in fluid communication with the second pipe body.

In one implementation mode, the insertion part is provided with an inclined notch, and the connecting rod is inserted into the inclined notch and is fixedly connected with the inner wall surface of the inclined notch;

wherein a portion of the oblique cutouts are used to form the communication ports.

In one implementation manner, the connecting rod is fixedly connected with the axial end of the insertion part and is used for plugging the opening of the axial end;

wherein, the pipe wall of the insertion part is provided with the circulation port.

In one implementation, the insertion portion is inserted into the second pipe body from the axial opening of the second pipe body in a sealing manner.

In one implementation, the connecting part comprises a connecting rod connected between the operation interface and the catheter, and the flow passage is formed by a second tube connected between the operation interface and the catheter;

wherein at least part of the connecting rod is embedded in the second pipe body.

In one implementation manner, the second tube body comprises a first sub tube body and a second sub tube body which are integrally formed;

the first sub-pipe body is arranged on the pushing part, and the second sub-pipe body is arranged on the catheter;

wherein at least part of the connecting rod is embedded in the first sub-pipe body.

In one implementation, the first tube comprises a metal.

In one implementation, the connecting rod is a solid structure.

In one implementation, the conduit is a composite structure consisting of an outer layer, an intermediate layer and an inner layer;

the stiffness of the catheter tapers in the direction from the proximal end to the distal end.

The technical scheme provided by the application can comprise the following beneficial effects:

the extension guiding catheter comprises an operation interface, a pushing part and a catheter which are sequentially connected from a near end to a far end; wherein the catheter is provided with a channel which is communicated along the axial direction and is used for conveying the instrument; a balloon is wound on the periphery of the catheter, and the balloon is in fluid communication with the operation interface; the pushing part is provided with a connecting part for connecting the operation interface with the catheter, and comprises a flow channel for fluidly communicating the operation interface with the balloon, and at least part of the connecting part is embedded in the flow channel. The extension that this application embodiment provided guides the pipe makes the propelling movement portion form inside and outside nested formula structure, has effectively reduced the radial maximum size of propelling movement portion, more does benefit to the transport of instruments such as seal wire, microcatheter.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

The foregoing and other objects, features and advantages of the application will be apparent from the following more particular descriptions of exemplary embodiments of the application as illustrated in the accompanying drawings wherein like reference numbers generally represent like parts throughout the exemplary embodiments of the application.

FIG. 1 is a schematic structural view of an elongate guiding catheter according to a first embodiment of the present application;

FIG. 2A is an enlarged view of a portion of FIG. 1 at I;

FIG. 2B is a cross-sectional view taken along A-A of FIG. 1;

FIG. 2C is a cross-sectional view taken along line B-B of FIG. 1;

FIG. 2D is a cross-sectional view taken along line C-C of FIG. 1;

FIG. 2E is a cross-sectional view taken along line D-D of FIG. 1;

FIG. 3 is a schematic structural view of an elongate guiding catheter according to a second embodiment of the present application;

FIG. 4A is an enlarged partial schematic view at II in FIG. 3;

fig. 4B is a cross-sectional view taken along E-E in fig. 3.

FIG. 5 is a schematic structural view of an elongate guiding catheter according to a third embodiment of the present invention;

FIG. 6 is a schematic structural view of an elongate guiding catheter according to a fourth embodiment of the present application;

FIG. 7A is a cross-sectional view taken along F-F of FIG. 6;

fig. 7B is a partially enlarged schematic view of fig. 6 at iii.

Reference numerals: 100. a conduit; 200. a first sub-tube body; 300. a second sub-tube body; 400. a first pipe body; 500. a connecting rod; 600. an operation interface; 110. a channel; 101 outer layer; 102. an intermediate layer; 103. an inner layer; 120. an instrument inlet; 130. a developable tip; 140. a balloon; 141. an expansion chamber; 210. a flow channel; 410. a flow port; 420. a port; 430. an interface.

Detailed Description

Embodiments of the present application will be described in more detail below with reference to the accompanying drawings. While embodiments of the present application are illustrated in the accompanying drawings, it should be understood that the present application may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

It should be understood that although the terms "first," "second," "third," etc. may be used herein to describe various information, these information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present application. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

In the description of the present application, it is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be considered limiting of the present application.

Unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections as well as removable connections or combinations; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In view of the above problems, an embodiment of the present application provides an extension guide catheter, which can reduce the maximum radial size of a pushing portion, and is more favorable for conveying devices such as guide wires and microcatheters.

The technical solutions of the embodiments of the present application are described in detail below with reference to the accompanying drawings.

Example one

FIG. 1 is a schematic diagram of an elongate guiding catheter according to a first embodiment of the present application.

Referring to fig. 1, the present embodiment provides an elongate guiding catheter comprising: an operation interface 600, a pushing part and a catheter 100 which are connected in sequence from a near end to a far end; wherein the catheter 100 is provided with a channel 110 for delivering the instrument, which runs through in the axial direction; a balloon 140 is wound around the periphery of the catheter 100, and the balloon 140 is in fluid communication with the operation interface 600; wherein the pushing part is provided with a connecting part for connecting the operation interface 600 with the catheter 100, and comprises a flow channel 210 for fluidly communicating the operation interface 600 with the balloon 140, and at least part of the connecting part is embedded in the flow channel 210.

The proximal end of the extension guiding catheter of the embodiment of the application is the end for operation of a doctor, and the distal end is the end far away from the operation of the doctor.

The extension that this application embodiment provided guides the pipe, makes propelling part form inside and outside nested formula structure, has effectively reduced the radial maximum dimension of propelling part, more does benefit to the transport of apparatuses such as seal wire, little pipe, in addition, has optimized the structure of the runner of propelling part, has strengthened the trafficability characteristic of medium among the runner 210, and then can realize inflating fast or the pressure release for sacculus 140.

Fig. 2E is a cross-sectional view taken along line D-D in fig. 1.

Referring to fig. 1 and 2E, in this embodiment, catheter 100 is provided with an angled instrument entrance 120 on the proximal side and a visualization tip 130 on the distal side. The catheter 100 is a composite structure composed of an outer layer 101, an intermediate layer 102 and an inner layer 103; the outer layer 101 of the catheter 100 is made of a material with higher hardness, so that the balloon 140 is better supported, and the catheter 100 cannot deform when the balloon 140 is pressurized.

In which the stiffness of the catheter 100 is gradually reduced in the proximal to distal direction, thereby not only avoiding deformation, but also facilitating passage through tortuous lesions.

In one implementation, the intermediate layer 102 may be comprised of a metal spring and braid; the material of the inner layer 103 may include HDPE (High Density Polyethylene) or PTFE (polytetrafluoroethylene).

In one implementation, the intermediate layer 102 may also be formed from a separately provided metal spring or from a separately provided braid.

It is understood that the intermediate layer 102 may not be limited to being composed of a metal spring and a braid, or to being composed of a separately disposed metal spring, or to being composed of a separately disposed braid, and the structure of the intermediate layer 102 is not limited in this application, for example, in other embodiments, the intermediate layer 102 may also be composed of a tube material that is cut and hollowed out.

In one implementation, balloon 140 includes an expandable or contractible inflation body disposed about the periphery of catheter 100 and defining an inflation lumen 141 with the outer tubular wall of catheter 100, with inflation lumen 141 being in fluid communication with operative interface 600 via flow channel 210.

In one implementation, balloon 140 may have a diameter of 1.5-4.5mm, but is not so limited.

In one implementation, the operation interface 600 may be a HUB interface for connecting to an external device, thereby pressurizing or depressurizing the balloon 140 through the flow channel 210. When the catheter is pressurized, a medium such as a fluid can be input from the operation interface 600 and injected into the expansion cavity 141 of the balloon 140 through the flow channel 210, so that the expansion body of the balloon 140 is expanded, and the catheter 100 can be anchored at a desired position in a blood vessel after the expansion body is expanded, thereby providing stronger axial supporting force for the extension guide catheter. Therefore, the defect that the prolonged guide catheter in the related technology generates reverse motion in blood vessels due to insufficient axial supporting force or heart beating and the like can be avoided, and instruments such as guide wires, micro-catheters and the like can be smoothly conveyed in the prolonged guide catheter.

Fig. 2E is a cross-sectional view taken along line D-D in fig. 1.

Referring to fig. 1 and 2E, in one implementation, the connecting member includes a first tube 400 and a connecting rod 500 connected in an axial direction; the flow path 210 is formed by a first tube 400 and a second tube connected to the first tube 400; wherein at least a portion of the first tube 400 and at least a portion of the connecting rod 500 are embedded in the second tube.

Wherein, the second pipe body comprises a first sub-pipe body 200 and a second sub-pipe body 300 which are integrally formed; the first sub-tube 200 is disposed in the pushing part, and the second sub-tube 300 is disposed in the catheter 100; at least a portion of the connecting rod 500 is embedded in the first sub-pipe 200.

In this embodiment, the second sub-tube 300 is disposed outside the catheter 100, and the inner diameter of the second sub-tube 300 may be smaller than that of the first sub-tube 200, so as to reduce the maximum radial dimension after the second sub-tube 300 and the catheter 100 are juxtaposed, thereby enabling the extension guiding catheter 100 to be smoothly advanced in the blood vessel. And at least a portion of the connection rod 500 is easily inserted into the first sub-pipe 200.

In this embodiment, the inner diameter of the first sub-tube 200 is set to be larger than that of the second sub-tube 300, so that the connection rod 500 can be embedded on the one hand, and on the other hand, the flow channel 210 for allowing a medium to pass through quickly can be formed between the connection rod 500, and further the pressurizing or pressure releasing speed of the balloon 140 can be increased.

In this embodiment, the first sub-pipe 200 and the second sub-pipe 300 may be integrally formed. For example, part of the tube walls of the first sub-tube 200 and the second sub-tube 300 may be integrally formed, or the first sub-tube 200 extends from the proximal end to the distal end and the inner diameter thereof gradually decreases to form the second sub-tube 300, so that the structural strength of the pushing portion can be improved and the process can be simplified after the first sub-tube 200 is integrally formed.

In one implementation, the second tube may be made of a material with a relatively high hardness, such as nylon or PEBAX (polyether block polyamide), so as to ensure that the flow channel 210 does not deform greatly when high pressure exists, thereby not only ensuring the medium passing ability, but also not affecting the transportation of the instrument.

In this embodiment, the connecting rod 500 may be a solid structure, or the connecting rod 500 and the end connected to the second tube body are a local solid structure.

In one implementation, the connecting rod 500 may be made of a metal, such as including but not limited to 304 or 316 stainless steel.

FIG. 2A is an enlarged view of a portion of FIG. 1 at I; fig. 2B is a cross-sectional view taken along a-a in fig. 1.

Referring to fig. 1, 2A and 2B, in the present embodiment, the first tube 400 includes an insertion portion inserted into the second tube; the first tube 400 is connected to the connection rod 500 by a connection part, and the connection part is provided with a flow port 410 in fluid communication with the second tube. After setting up like this for first body 400 has realized in the inside of second body and has linked to each other with connecting rod 500 fixed, makes inside and outside nested structure of propelling movement portion realization, can reduce the radial dimension of propelling movement portion, more does benefit to the transport of other apparatus.

Continuing to refer to fig. 2A, the insertion portion is inserted into the second tube body from the axial opening of the second tube body in a sealing manner, wherein a plug port 430 is disposed at one side of the proximal end of the second tube body, the insertion portion is inserted into the second tube body from the plug port 430, and the edge of the plug port 430 is connected to the outer tube wall of the first tube body in a sealing manner, so that one side of the proximal end of the second tube body is in a sealing state, and further, the medium in the flow channel 210 does not leak.

In one implementation, the edge of the socket 430 on the proximal side of the second tube can be welded to the outer tube wall of the first tube 400, which makes the connection between the first tube 400 and the second tube more secure.

In this embodiment, the connecting rod 500 is fixedly connected to the axial end of the insertion part and is used for plugging the opening of the axial end; wherein, the pipe wall of the insertion part is provided with a circulation port. The proximal end of the connector rod 500 may be radially sized to fit within the port 420 cross-section of the first tube 400 such that the proximal end of the connector rod 500 just seals off the port 420. In addition, the connecting rod 500 and the first pipe 400 are axially supported to each other, so that the structural stability of the pushing part can be improved.

With continued reference to fig. 1 and 2B, the proximal end of the connecting rod 500 is fixedly connected to the first tube 400, and the distal end thereof extends to the catheter 100 after the wall of the second tube is penetrated, and is fixedly connected to the wall of the catheter 100.

In one implementation, the material of the first tube 400 includes metal, such as a hypotube. Alternatively, the material of the first tube 400 may include nitinol or stainless steel. This allows the first tube 400 to have a higher stiffness and a better kink resistance, and the elongate guide catheter of this embodiment can be pushed more easily with the same size as the elongate guide catheter of the related art.

Example two

FIG. 3 is a schematic diagram of an elongate guiding catheter according to a second embodiment of the present application.

Referring to fig. 3, the extension guiding catheter of the embodiment of the present application includes an operation interface 600, a pushing portion and a catheter 100, which are sequentially connected from a proximal end to a distal end; wherein the catheter 100 is provided with a channel 110 for delivering the instrument, which runs through in the axial direction; a balloon 140 is wound around the periphery of the catheter 100, and the balloon 140 is in fluid communication with the operation interface 600; wherein the pushing part is provided with a connecting part for connecting the operation interface 600 with the catheter 100, and comprises a flow channel 210 for fluidly communicating the operation interface 600 with the balloon 140, and at least part of the connecting part is embedded in the flow channel 210.

According to the extension guide catheter provided by the embodiment of the application, the pushing part forms an inner nested structure and an outer nested structure, the radial maximum size of the pushing part is effectively reduced, and the extension guide catheter is more beneficial to conveying of instruments such as guide wires and microcatheters. In addition, the medium passing capacity in the flow channel 210 is enhanced, and the balloon 140 can be quickly pressurized or depressurized.

It should be noted that the extension guiding tube provided in the second embodiment is substantially the same as that of the first embodiment, except that the connection manner between the first tube 400 and the connecting rod 500 and the structure of the communication port 410 are different from those of the first embodiment.

FIG. 4A is an enlarged partial schematic view at II in FIG. 3; fig. 4B is a cross-sectional view taken along E-E in fig. 3.

Referring to fig. 3, 4A and 4B, in the present embodiment, the insertion portion is provided with an inclined cut, and the connection rod 500 is inserted into the inclined cut and is fixedly connected to an inner wall surface at the inclined cut; wherein the partially inclined cut-out is used to form the flow opening 410.

In one implementation, the axial included angle between the inclined notch and the pushing part can be 0-90 degrees.

In this embodiment, the diameter of the connection rod 500 may be smaller than the inner diameter of the first tube 400, and after the connection rod 500 is inserted into the inclined notch, only a partial space of the inclined notch is occupied, and the medium in the first tube 400 may be output to the second tube from the remaining space of the inclined notch.

In addition, after the connecting rod 500 is inserted into the inclined notch, the outer wall surface of the connecting rod 500 is fixedly connected with the inner wall surface of the first pipe body 400, for example, the connecting rod 500 can be fixedly connected with the inner wall surface of the first pipe body 400 in a welding manner, so that the connecting area of the connecting rod 500 and the first pipe body 400 can be increased, and the connecting strength of the connecting rod 500 and the first pipe body 400 is further improved.

EXAMPLE III

Figure 5 is a schematic view of an elongate guiding catheter according to a third embodiment of the present invention.

Referring to fig. 5, the extension guiding catheter of the embodiment of the present application includes an operation interface 600, a pushing portion and a catheter 100, which are sequentially connected from a proximal end to a distal end; wherein the catheter 100 is provided with a channel 110 for delivering the instrument, which runs through in the axial direction; a balloon 140 is wound around the periphery of the catheter 100, and the balloon 140 is in fluid communication with the operation interface 600; wherein the pushing part is provided with a connecting part for connecting the operation interface 600 with the catheter 100, and comprises a flow channel 210 for fluidly communicating the operation interface 600 with the balloon 140, and at least part of the connecting part is embedded in the flow channel 210.

The extension that this application embodiment provided guides the pipe makes the propelling movement portion form inside and outside nested formula structure, has effectively reduced the radial maximum size of propelling movement portion, more does benefit to the transport of instruments such as seal wire, microcatheter.

It should be noted that the extension guiding catheter of the third embodiment is substantially the same as that of the first and second embodiments, except that the structure of the pushing part of the third embodiment is different from that of the first and second embodiments.

The pushing part of the present embodiment may not include the first tube 400, but includes the connecting rod 500, and the second tube and the connecting rod 500 are connected to the operation port 600 and the conduit 100.

In this embodiment, the partial flow path 210 of the pushing part is formed between the second pipe and the connection rod 500, and the first pipe 400 is not provided, so that the structure of the pushing part can be simplified.

Example four

FIG. 6 is a schematic view of an elongate guiding catheter according to a fourth embodiment of the present application.

Referring to fig. 6, the extension guiding catheter of the embodiment of the present application includes an operation interface 600, a pushing portion and a catheter 100, which are sequentially connected from a proximal end to a distal end; wherein the catheter 100 is provided with a channel 110 for delivering the instrument, which runs through in the axial direction; a balloon 140 is wound around the periphery of the catheter 100, and the balloon 140 is in fluid communication with the operation interface 600; wherein the pushing part is provided with a connecting part for connecting the operation interface 600 with the catheter 100, and comprises a flow channel 210 for fluidly communicating the operation interface 600 with the balloon 140, and at least part of the connecting part is embedded in the flow channel 210.

It should be noted that the extension guiding catheter of the fourth embodiment is substantially the same as that of the first to third embodiments, except that the structure of the pushing part of the fourth embodiment is different from that of the first to third embodiments.

The pushing part of the present embodiment may not have the connecting rod 500, but includes the first tube 400, and the first tube 400 is connected to the operation port 600 and connected to the catheter 100.

Fig. 7A is a sectional view taken along F-F in fig. 6, and fig. 7B is a partially enlarged schematic view taken at iii in fig. 6.

Referring to fig. 6, 7A and 7B, in the present embodiment, the connection member includes a first pipe body 400; the flow passage is formed by a first tube 400 and a second tube connected to the first tube 400; at least part of the first pipe 400 is embedded in the second pipe, so that the structure of the pushing part can be simplified, and the radial size of the pushing part can be reduced.

In one implementation, the first tube 400 includes a plug portion that plugs into the second tube, the plug portion being provided with a flow port that is in fluid communication with the second tube. The end of the insertion part passes through the wall of the second tube and is connected to the catheter 100, for example, passes through the wall of the first sub-tube 200 of the second tube and is connected to the catheter 100,

in this embodiment, the insertion part is provided with an inclined cutout for forming the circulation port 410. The structure can not only enlarge the size of the circulation port and improve the fluid passing capacity. The material of the first tube 400 includes metal, for example, a hypotube can be used. Alternatively, the material of the first tube 400 may include nitinol or stainless steel. Thus, the first tube 400 has higher hardness, so that the connection stability between the operation interface and the catheter 100 is better, and the tube has good kink resistance, and can improve the pushing performance of the extension guide catheter.

It is to be understood that the pushing portion of the present embodiment may not be limited to the structures in the above embodiments one to four, and the above is only an exemplary description.

The aspects of the present application have been described in detail hereinabove with reference to the accompanying drawings. In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments. Those skilled in the art should also appreciate that the acts and modules referred to in the specification are not necessarily required for the application. In addition, it can be understood that the steps in the method of the embodiment of the present application may be sequentially adjusted, combined, and deleted according to actual needs, and the modules in the device of the embodiment of the present application may be combined, divided, and deleted according to actual needs.

Having described embodiments of the present application, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen in order to best explain the principles of the embodiments, the practical application, or improvements made to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. An elongate guide catheter, comprising:

2. The elongate guiding catheter of claim 1, wherein:

the connecting part comprises a first pipe body;

3. The elongate guiding catheter of claim 2, wherein:

the first pipe body comprises an insertion part inserted in the second pipe body, and the insertion part is provided with a circulation port which is in fluid communication with the second pipe body.

4. The elongate guiding catheter of claim 1, wherein:

the connecting part comprises a first pipe body and a connecting rod which are connected along the axial direction;

5. The elongate guiding catheter of claim 4, wherein:

the first pipe body comprises an inserting part inserted in the second pipe body;

6. The elongate guiding catheter of claim 5, wherein:

the connecting rod is inserted in the inclined notch and fixedly connected with the inner wall surface at the inclined notch;

7. The elongate guiding catheter of claim 5, wherein:

the connecting rod is fixedly connected with the axial end of the inserting part and is used for sealing the opening of the axial end;

8. The elongate guiding catheter according to any one of claims 2-7, wherein:

the inserting part is inserted in the second pipe body from the axial opening of the second pipe body in a sealing mode.

9. The elongate guiding catheter of claim 1, wherein:

the connecting part comprises a connecting rod connected between the operation interface and the guide pipe, and the flow passage is formed by a second pipe body connected between the operation interface and the guide pipe;

10. The elongate guiding catheter according to any one of claims 2-7, 9, wherein:

the second pipe body comprises a first sub pipe body and a second sub pipe body which are integrally formed;

11. The elongate guiding catheter according to any one of claims 2-7, wherein:

the first pipe body is made of metal.

12. The elongate guiding catheter according to any one of claims 4-7, wherein:

the connecting rod is of a solid structure.

13. The elongate guiding catheter of claim 1, wherein: the conduit is a composite structure consisting of an outer layer, a middle layer and an inner layer;