CN113995945A

CN113995945A - Extension catheter

Info

Publication number: CN113995945A
Application number: CN202111507175.8A
Authority: CN
Inventors: 张鹏涛; 陈晓艺; 冯观妹
Original assignee: Insight Lifetech Co Ltd
Current assignee: Insight Lifetech Co Ltd
Priority date: 2021-12-10
Filing date: 2021-12-10
Publication date: 2022-02-01
Also published as: WO2023103542A1

Abstract

The present application relates to an extension catheter. The extension catheter includes: the operation interface, the pushing part and the catheter are sequentially connected from the near end to the far end; the catheter is provided with a channel which is through along the axial direction and used for conveying an instrument, and one side of the near end of the channel is provided with an instrument inlet; the pushing part comprises a connecting part connected between the operation interface and the catheter, a balloon is wound on the periphery of the connecting part, a flow channel is formed in the axis direction of the connecting part, and the balloon is in fluid communication with the operation interface through the flow channel. The scheme that this application provided can strengthen the axial holding power of extension pipe, enables the seal wire simultaneously and can not produce the removal, has avoided leading to the phenomenon of seal wire displacement because of little pipe withdraws from among the correlation technique.

Description

Extension catheter

Technical Field

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

When the extension catheter in the related art is used in combination with instruments such as a microcatheter and the like which have smaller inner diameters and do not have a rapid exchange channel, the phenomenon of guide wire displacement caused by withdrawal of the microcatheter can occur, and the operation can be influenced.

Disclosure of Invention

In order to solve or partially solve the problems existing in the related art, the application provides the extension catheter, which can enhance the axial supporting force of the extension catheter, simultaneously can prevent the guide wire from moving, and avoids the phenomenon of guide wire displacement caused by the withdrawal of the microcatheter in the related art.

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

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

the catheter is provided with a channel which is through along the axial direction and used for conveying an instrument, and one side of the near end of the channel is provided with an instrument inlet;

the pushing part comprises a connecting part connected between the operation interface and the catheter, a balloon is wound on the periphery of the connecting part, a flow channel is formed in the connecting part, and the balloon is in fluidic communication with the operation interface through the flow channel.

In one implementation manner, the connecting part comprises a first tube and a connecting rod which are connected in the axial direction, and the balloon is wound at the joint of the first tube and the connecting rod;

the flow passage is formed by the first tube body provided with a flow port at the junction in fluid communication with the balloon.

In one implementation manner, the first pipe body is provided with an inclined cut at the connection position, the connecting rod is inserted into the inclined cut and is fixedly connected with the inner wall surface of the inclined cut, wherein part of the inclined cut is used for forming the flow opening; or

The connecting rod is fixedly connected with the axial end of the first pipe body and used for blocking an opening of the axial end, wherein the flow opening is formed in the pipe wall of the connecting position of the first pipe body.

In one implementation, the connecting part includes a first tube connected between the operation interface and the catheter, and the flow passage is formed in the first tube;

the first pipe body is positioned on the pipe wall in the sacculus and is provided with an opening which is communicated with the sacculus in a fluid manner.

In one implementation, the opening is an oblique cut provided on a tube wall of the first tube located in the balloon.

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, the sacculus is around locating the connecting rod, at least part the connecting rod inlays to be located in the second pipe body.

In one implementation, the first tube comprises a metal; or

The first tube is a hypotube.

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

In one implementation manner, one side of the balloon, which is located at the distal end, is a sealing end, one side of the balloon, which is located at the proximal end, is formed with a fluid inlet communicated with the flow channel, and the fluid inlet is arranged in the pushing portion.

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 catheter comprises an operation interface, a pushing part and a catheter which are sequentially connected from a near end to a far end; the catheter is provided with a channel which is through along the axial direction and used for conveying an instrument, and one side of the near end of the channel is provided with an instrument inlet; the pushing part comprises a connecting part connected between the operation interface and the catheter, a balloon is wound on the periphery of the connecting part, a flow channel is formed in the axis direction of the connecting part, and the balloon is in fluid communication with the operation interface through the flow channel. After the arrangement, media such as fluid and the like can be injected into the balloon from the flow channel arranged in the pushing part, when the balloon is pressurized, the axial supporting force of the extension catheter can be enhanced, the guide wire can not move, the phenomenon that the guide wire is displaced due to the fact that the microcatheter is withdrawn in the related technology is avoided, and further the operation is not influenced; in addition, after the flow channel is arranged in the connecting part, the radial size of the pushing part can be reduced, and the conveying of other instruments is facilitated.

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 catheter shown in 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. 3 is a schematic structural view of an elongate catheter shown in 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 line C-C of fig. 3.

FIG. 5 is a schematic structural view of an elongate catheter shown in a third embodiment of the present application;

FIG. 6A is an enlarged partial schematic view at III in FIG. 5;

fig. 6B is a cross-sectional view taken along line C-C of fig. 3.

Reference numerals: 100. a conduit; 200. a first pipe body; 300. a second tube body; 400. a connecting rod; 500. 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; 220. an oblique cut; 310. a port.

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, the embodiment of the present application provides an extension catheter, which not only can enhance the axial supporting force of the extension catheter, but also can prevent the guide wire from moving, thereby avoiding the phenomenon of guide wire displacement caused by the withdrawal of the microcatheter in the related art, and further avoiding the influence on the operation.

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 structural view of an elongate catheter shown in a first embodiment of the present application; fig. 2A is a partially enlarged schematic view at i in fig. 1.

Referring to fig. 1 and 2, an extension catheter provided by an embodiment of the present application includes: an operation interface 500, a pushing part and a catheter 100 which are connected in sequence from the proximal end to the distal end; wherein, the catheter 100 is provided with a channel 110 which is penetrated along the axial direction and used for conveying the instrument, and one side of the proximal end of the channel 110 is provided with an instrument inlet 120; the pushing part includes a connecting part connected between the operation interface 500 and the catheter 100, the balloon 140 is wound around the outer periphery of the connecting part, a flow channel 210 is formed along the axial direction of the connecting part, and the balloon 140 is in fluid communication with the operation interface 500 through the flow channel 210.

According to the extension catheter provided by the embodiment of the application, as the balloon 140 is arranged at the pushing part, media such as fluid can be injected into the balloon 140 from the flow channel 210 arranged in the connecting part, when the balloon 140 is pressurized, the axial supporting force of the extension catheter can be enhanced, the guide wire can not move, the phenomenon that the guide wire is displaced due to the fact that the micro-catheter exits in the related art is avoided, and then the operation is not influenced. In addition, after the flow passage 210 is arranged along the axis of the connecting part, the radial size of the pushing part can be reduced, and the conveying of other instruments is facilitated.

Fig. 2C is a cross-sectional view taken along line B-B in fig. 1.

Referring to fig. 1-2C, 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 high hardness, so that the catheter 100 does not deform.

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.

With continued reference to fig. 2A, in one implementation, balloon 140 includes an expandable or contractible inflation body disposed about the periphery of the coupling member and defining an inflation lumen 141 therein, which inflation lumen 141 is in fluid communication with operative interface 500 via flow channel 210.

One side of the balloon 140 at the distal end is a sealing end, and one side of the balloon 140 at the proximal end is a fluid inlet communicated with the flow channel 210, and the fluid inlet is arranged in the pushing part.

In this embodiment, the size of the balloon 140 may be 1.5-4.5 mm. The balloon 140 may be wrapped at 6cm from the instrument portal 120, but is not limited thereto.

In one implementation, the operation interface 500 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 100 is pressurized, a medium such as a fluid can be input from the operation interface 500 and injected into the inflation cavity 141 of the balloon 140 through the flow channel 210, so that the inflation body of the balloon 140 is expanded, and the catheter 100 can be anchored at a desired position in other catheters used in cooperation with the inflation body. Meanwhile, the guide wire can be limited between the inflated expansion body and other catheters, so that when the microcatheter is withdrawn, the guide wire cannot be displaced, and the operation cannot be influenced.

In one implementation, the connecting component of the pushing part includes a first tube 200 and a connecting rod 400 connected in the axial direction, and the balloon 140 is wound around the connecting position of the first tube 200 and the connecting rod 400; the flow channel 210 is formed by a first tube 200, the first tube 200 being provided with a flow port at the junction in fluid communication with the balloon 140. The medium in flow channel 210 can flow out of the flow port while being injected into balloon 140, causing balloon 140 to expand.

In one implementation, the first tube 200 is provided with an inclined slit 220 at a connection portion, and the connection rod 400 is inserted into the inclined slit 220 and is fixedly connected to an inner wall surface of the inclined slit 220, wherein a portion of the inclined slit 220 is used to form a flow port.

In one implementation, the inclined notch 220 may be axially angled from the push rod by 0-90 degrees, but is not limited thereto.

In this embodiment, two ends of the expansion body of the balloon 140 are fixedly connected with the first tube 200; or, one end of the expansion body of the balloon 140 is fixedly connected to the first tube 200, and the other end is fixedly connected to the connecting rod 400; as shown in fig. 2A, one end of the inflation body of the balloon 140 is fixedly connected to the first tube 200, a part of the other end is connected to the first tube 200, and another part is connected to the connection rod 400, for example, a part of the inflation body is connected to the connection rod 400 radially toward the side of the inclined opening and connected to the first tube 200 radially away from the side of the inclined opening. This allows the oblique incision 220 to be received in the inflation lumen 141, and the medium output from the partial oblique incision 220 can be injected into the inflation lumen 141, causing the balloon 140 to expand rapidly. In this embodiment, the diameter of the connection rod 400 may be smaller than the inner diameter of the first tube 200, the connection rod 400 only occupies a part of the space of the oblique incision 220 after being inserted into the oblique incision 220, and the medium in the first tube 200 may be injected into the inflation cavity 141 of the balloon 140 from the remaining space of the oblique incision.

In addition, after the connecting rod 400 is inserted into the inclined notch 220, the outer wall surface of the connecting rod 400 is fixedly connected with the inner wall surface of the first pipe body 200, for example, the outer wall surface of the connecting rod 400 is fixedly connected with the inner wall surface of the first pipe body 200 in a welding manner, so that the connecting area of the connecting rod 400 and the first pipe body 200 can be increased, and the connecting strength of the connecting rod 400 and the first pipe body 200 is further improved.

In this embodiment, after the connecting rod 400 is inserted into the inclined notch 220, an inner and outer nested structure is formed, and the radial size of the pushing portion is further reduced.

In other implementations, the connecting rod 400 is fixedly connected to the axial end of the first tube 200 and is used to close the opening of the axial end, wherein the first tube 200 has a flow opening on the tube wall at the connection. The proximal end of the connecting rod 400 may be radially sized to fit within the cross-sectional area of the opening (not shown) of the axial end of the first tube 200 such that the proximal end of the connecting rod 400 just closes off the opening of the axial end. In addition, the connecting rod 400 and the first tube 200 are axially supported to each other, so that the structural stability of the pushing part can be improved.

In this embodiment, the connecting rod 400 may be a solid structure, or the connecting rod 400 and the first tube 200 are connected to form a partially solid structure.

Specifically, in one implementation, the connecting rod 400 may be made of a metal, such as including but not limited to 304 or 316 stainless steel.

In one implementation, the material of the first tube 200 includes metal, such as a hypotube. Alternatively, the material of the first tube 200 may include nitinol or stainless steel. This provides the first tube 200 with a higher stiffness and a better kink resistance, which results in a better pushability of the extension tube of the present embodiment at the same size as the extension tube of the related art.

Example two

FIG. 3 is a schematic structural view of an elongate catheter shown in a second embodiment of the present application; fig. 4A is a partially enlarged schematic view of fig. 3 at ii.

Referring to fig. 3 and 4A, an extension catheter provided by an embodiment of the present application includes: an operation interface 500, a pushing part and a catheter 100 which are connected in sequence from the proximal end to the distal end; wherein, the catheter 100 is provided with a channel 110 which is penetrated along the axial direction and used for conveying the instrument, and one side of the proximal end of the channel 110 is provided with an instrument inlet 120; the pushing part includes a connecting part connected between the operation interface 500 and the catheter 100, the balloon 140 is wound around the outer periphery of the connecting part, a flow channel 210 is formed along the axial direction of the connecting part, and the balloon 140 is in fluid communication with the operation interface 500 through the flow channel 210.

In addition, after the flow channel is arranged in the connecting part, the radial size of the pushing part can be reduced, and the conveying of other instruments is facilitated.

It should be noted that the extension duct of the second embodiment is substantially the same as that of the first embodiment, except that the structure of the pushing portion of the second embodiment is different from that of the first embodiment.

Fig. 4B is a cross-sectional view taken along line C-C of fig. 3.

Referring to fig. 1 to 4B, in the present embodiment, the connection part of the pushing part includes a first tube connected between the operation interface 500 and the catheter 100, and the flow path 210 is formed in the first tube 200; the first tube 200 has an opening in fluid communication with the balloon 140 at the wall of the tube within the balloon 140. The medium in the flow channel 210 can flow out of the opening and be delivered into the inflation lumen 141 of the balloon 140, causing the balloon 140 to expand.

In one implementation, the opening is an oblique cut 220 formed in the wall of the first tube 200 within the balloon 140. Therefore, the area of the opening can be increased, the circulation speed of the medium is increased, and the pressurizing or depressurizing speed of the balloon 140 can be increased.

In this embodiment, both ends of the expansion body of the balloon 140 are fixedly connected to the first tube 200, and the inclined slit 220 is accommodated in the expansion cavity 141, so that after the arrangement, the medium output from the inclined slit 220 can be injected into the expansion cavity 141 to expand the balloon.

In this embodiment, the cut-off notch 220 can increase the flow velocity of media such as fluid in the first tube 200, which is beneficial to rapidly pressurizing or depressurizing the balloon 140.

EXAMPLE III

FIG. 5 is a schematic structural view of an elongate catheter shown in a third embodiment of the present application; fig. 6A is a partially enlarged schematic view of fig. 5 at iii.

Referring to fig. 5 and 6, an extension catheter provided by an embodiment of the present application includes: an operation interface 500, a pushing part and a catheter 100 which are connected in sequence from the proximal end to the distal end; wherein, the catheter 100 is provided with a channel 110 which is penetrated along the axial direction and used for conveying the instrument, and one side of the proximal end of the channel 110 is provided with an instrument inlet 120; the pushing part includes a connecting part connected between the operation interface 500 and the catheter 100, the balloon 140 is wound around the outer periphery of the connecting part, a flow channel 210 is formed along the axial direction of the connecting part, and the balloon 140 is in fluid communication with the operation interface 500 through the flow channel 210.

It should be noted that the extension duct in the third embodiment is basically the same as those in the first and second embodiments, but the structure of the pushing portion in the third embodiment is different from that in the first and second embodiments.

With continued reference to fig. 6A and 6B, in the present embodiment, the connection component of the pushing part of the present embodiment includes a connection rod 400 connected between the operation interface 500 and the catheter 100, and the flow passage 210 is formed by the second tube 300 connected between the operation interface 500 and the catheter 100; the balloon 140 is wound around the connecting rod 400, and at least a portion of the connecting rod 400 is embedded in the second tube 300.

In this embodiment, the second tube is connected between the operation interface 500 and the balloon 140, the edge of the port 310 of the second tube 300 located at the distal end side is fixedly connected with the proximal end side of the expansion body of the balloon 140, the distal end side of the expansion body is fixedly connected with the outer wall surface of the connecting rod 400, so as to form the closed expansion cavity 141, and after the setting, the medium output from the port 310 can be injected into the expansion cavity 141, so as to expand the balloon.

The pushing part of the present embodiment may not include the first tube 200, but includes the connecting rod 400, and the second tube 300 and the connecting rod 400 are connected to the operation port 500 and the conduit 100.

In this embodiment, a part of the flow channel 210 of the pushing part is formed between the second tube 300 and the connecting rod 400, for example, the flow channel 210 close to the operation port 500 is provided between the second tube 300 and the connecting rod 400, and the first tube 200 is not provided, so that the structure of the pushing part can be simplified.

It is to be understood that the pushing portion of the present embodiment may not be limited to the structures in the above first to third embodiments, 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 extension catheter, comprising:

the pushing part comprises a connecting part connected between the operation interface and the catheter, a balloon is wound on the periphery of the connecting part, a flow channel is formed in the axis direction of the connecting part, and the balloon is in fluid communication with the operation interface through the flow channel.

2. The extension catheter of claim 1, wherein:

the connecting part comprises a first pipe body and a connecting rod which are connected along the axial direction, and the balloon is wound at the connecting part of the first pipe body and the connecting rod;

3. The extension catheter of claim 2, wherein:

the first pipe body is provided with an inclined cut at the connecting part, the connecting rod is inserted into the inclined cut and is fixedly connected with the inner wall surface of the inclined cut, and part of the inclined cut is used for forming the circulation port; or

4. The extension catheter of claim 1, wherein:

the connecting part comprises a first pipe body connected between the operation interface and the catheter, and the flow passage is formed in the first pipe body;

5. The extension catheter of claim 4, wherein:

the opening is an inclined cut arranged on the tube wall of the first tube body in the balloon.

6. The extension 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;

7. The extension catheter of any one of claims 4 to 5, wherein:

the first pipe body is made of metal; or

The first tube is a hypotube.

8. The extension catheter of claim 1, wherein:

the connecting rod is of a solid structure.

9. The extension catheter of claim 1, wherein:

one side of the sacculus, which is positioned at the far end, is a sealing end, one side of the sacculus, which is positioned at the near end, is provided with a fluid inlet communicated with the flow channel, and the fluid inlet is arranged in the pushing part.

10. The extension catheter of claim 1, wherein:

the conduit is a composite structure consisting of an outer layer, a middle layer and an inner layer;