CN115054807B

CN115054807B - Extension guide catheter

Info

Publication number: CN115054807B
Application number: CN202210735150.1A
Authority: CN
Inventors: 张鹏涛; 陈晓艺
Original assignee: Insight Lifetech Co Ltd
Current assignee: Insight Lifetech Co Ltd
Priority date: 2022-06-27
Filing date: 2022-06-27
Publication date: 2024-05-10
Anticipated expiration: 2042-06-27
Also published as: CN115054807A

Abstract

The present application relates to an elongate guiding catheter. The extension guiding catheter comprises an operation part, a pushing part and a catheter which are sequentially connected from the proximal end to the distal end; the catheter is provided with a channel which is communicated along the axial direction and used for conveying the instrument, one side of the channel facing the proximal end is provided with an instrument inlet, the periphery of the pushing part is wound with a first balloon, and the periphery of the catheter is wound with a second balloon; the operation part is provided with a first interface and a second interface, the first interface is communicated with the first balloon through a first flow channel, and the second interface is communicated with the second balloon through a second flow channel; the pushing part comprises a first pipe body and a second pipe body, the first flow channel is arranged in the first pipe body, and the second flow channel is arranged in the second pipe body; the technical scheme provided by the application can anchor the guide wire, has an anchoring effect on the catheter, and can smoothly convey the micro-catheter and other instruments.

Description

Extension guide catheter

Technical Field

The application relates to the technical field of medical instruments, in particular to an extension guiding catheter.

Background

Percutaneous coronary intervention (percutaneous coronary intervention, PCI) surgery refers to a therapeutic approach to the improvement of blood perfusion of the myocardium by dredging stenosed and even occluded coronary lumens via cardiac catheter techniques. The operation has the advantages of short treatment course, small wound, obvious curative effect and the like, and has rapid development in recent years.

When the extension catheter in the related art is matched with the instruments with smaller inner diameter such as a micro catheter and no rapid exchange channel, the phenomenon of guide wire displacement caused by the withdrawal of the micro catheter can occur, and the operation can be influenced; in addition, in percutaneous coronary intervention operation, instruments such as a guide wire and a microcatheter are pushed from an extension catheter to a desired position in a coronary artery, however, the delivery of the instruments such as the microcatheter is not facilitated due to insufficient radial supporting force of the extension guiding catheter in the related art, so that the operation difficulty is increased.

In view of the foregoing, there is a need for an extended guide catheter that has both good anchoring and supporting forces and avoids displacement of the guidewire.

Disclosure of Invention

In order to solve or partially solve the problems in the related art, the application provides an extension guide catheter which can prevent a guide wire from moving, has an anchoring effect on the catheter, and can more smoothly convey instruments such as the guide wire, the micro catheter and the like.

The present application provides an elongate guiding catheter comprising:

an operation part, a pushing part and a catheter which are sequentially connected from the proximal end to the distal end; the catheter is provided with a channel which is communicated along the axial direction and used for conveying the instrument, an instrument inlet is formed in one side, facing the proximal end, of the channel, a first balloon is wound around the periphery of the pushing part, and a second balloon is wound around the periphery of the catheter;

The operation part is provided with a first interface and a second interface, the first interface is communicated with the first balloon through a first flow channel, and the second interface is communicated with the second balloon through a second flow channel;

The pushing part comprises a first pipe body and a second pipe body, the first flow channel is arranged in the first pipe body, and the second flow channel is arranged in the second pipe body; the catheter comprises a catheter body, a first balloon, a second balloon, a first tube body, a second balloon and a second tube body, wherein the first tube body is close to one end of the catheter, the first tube body is provided with a first flow port, the first flow port is positioned in the first balloon, the second tube body penetrates out of the first balloon and then extends into the second balloon, the end part of the distal end of the second tube body is provided with a second flow port, and the second flow port is positioned in the second balloon.

In one embodiment, the first section of the second pipe body is sleeved outside the first pipe body; or (b)

The first section of the second pipe body is accommodated in the first pipe body; or (b)

The second pipe body is arranged in parallel with the first pipe body.

In one embodiment, the second tube body comprises a first section and a second section integrally connected;

The first section is arranged close to the operation part, the second section is arranged close to the second balloon and is arranged on one side away from the instrument inlet in the radial direction, and the first circulation port and the instrument inlet are arranged on the same side in the radial direction.

In one embodiment, the second tubular body further comprises a transition section connected to the first section and the second section;

at least part of the transition section is located within the first balloon, the transition section passing out of the first balloon on a side facing away from the instrument inlet; or the transition section is positioned on one side of the first balloon close to the operation part, and the transition section passes through the first balloon on one side of the transition section, which is away from the instrument inlet.

In one embodiment, the pushing part further comprises a connecting rod connected between the first pipe body and the catheter, the connecting rod and the second pipe body are arranged in parallel, and the instrument inlet and the second pipe body are respectively arranged at two radial sides of the connecting rod;

the first balloon is wound at the joint of the first tube body and the connecting rod; or, the first balloon is wound at the position of the first tube body close to the connecting rod.

In one embodiment, the first tube body is connected with the catheter, the first balloon is arranged adjacent to the instrument inlet, one side of the distal end of the first tube body is provided with an inclined incision, the inclined incision penetrates out of the second tube body in the interior of the first balloon, and penetrates out of the tube wall of the second tube body on the same side of the instrument inlet in the radial direction;

The inclined incision is provided with first circulation opening at the position of wearing out the second body, first circulation opening is located first sacculus, the distal end of inclined incision extends first sacculus and with the pipe is connected.

In one embodiment, the first pipe body is provided with an inclined notch at the connection position, the connecting rod is inserted into the inclined notch and fixedly connected with the inner wall surface of the second pipe body close to the inclined notch, and part of the inclined notch is used for forming the first flow opening; or (b)

The connecting rod is fixedly connected with the axial end of the first pipe body and used for blocking the opening of the axial end, wherein the pipe wall of the connecting part of the first pipe body is provided with an opening for forming the first circulation port.

In one embodiment, the first balloon comprises a first sealing end arranged towards the proximal end and a second sealing end arranged towards the distal end, wherein the first sealing end is in sealing connection with the wall of the first tube body and/or the wall of the second tube body, and the second sealing end is in sealing connection with the wall of the first tube body and/or the wall of the second tube body.

In one embodiment, the first balloon comprises a first sealing end arranged towards the proximal end and a second sealing end arranged towards the distal end, wherein the first sealing end is in sealing connection with the wall of the first tube body and/or the wall of the second tube body, and the second sealing end is in sealing connection with the connecting rod and/or the wall of the second tube body.

In one embodiment, an included angle is formed between the first interface and the second interface;

The first interface and the second interface are arranged as a whole; or, the first interface and the second interface are separately arranged.

In one embodiment, developing parts are arranged in the first balloon and the second balloon, the developing parts in the first balloon are fixed on a first tube body, or the developing parts in the first balloon are fixed on the second tube body and/or the connecting rod, and the developing parts in the second balloon are fixed on the catheter.

In one embodiment, the first pipe body and/or the second pipe body are/is made of a metal material or a polymer material; or (b)

The catheter is a composite structure formed by an outer layer, an intermediate layer and an inner layer, and the hardness of the catheter is gradually reduced along the direction from the proximal end to the distal end.

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

According to the extension guide catheter provided by the embodiment of the application, on one hand, as the first balloon is arranged on the periphery of the pushing part, and the medium such as fluid can be injected into the first balloon from the first flow channel, when the first balloon is pressurized, the axial supporting force of the extension guide catheter can be enhanced, meanwhile, the guide wire can not move, the phenomenon of guide wire displacement caused by the withdrawal of the microcatheter in the related art is avoided, and further, the operation is not influenced. On the other hand, since the second balloon is arranged at the periphery of the catheter, the medium such as fluid can be injected into the second balloon through the second flow passage, when the second balloon is pressurized, the distal end of the catheter can be anchored at a desired position in the blood vessel of the human body, and the axial supporting force of the extension guiding catheter is further enhanced. Therefore, the defect that the extension guiding catheter in the related art generates reverse motion in the blood vessel due to insufficient axial supporting force, heart beating and the like can be avoided, and instruments such as guide wires, micro-catheters and the like can be conveyed in the catheter more smoothly.

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 as claimed.

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

FIG. 1B is an enlarged partial schematic view of the elongate guiding catheter shown in FIG. 1;

FIG. 1C is a cross-sectional view of the elongate guiding catheter shown in FIG. 1 along A1-A1;

FIG. 1D is a cross-sectional view of the elongate guiding catheter shown in FIG. 1, taken along line B1-B1;

FIG. 2A is a schematic view of an elongate guiding catheter according to another embodiment of the present application;

FIG. 2B is an enlarged partial schematic view of the elongate guiding catheter shown in FIG. 2A;

FIG. 2C is a cross-sectional view of the elongate guiding catheter shown in FIG. 2A along A2-A2;

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

FIG. 3B is an enlarged partial schematic view of the elongate guiding catheter shown in FIG. 3A;

FIG. 3C is a cross-sectional view of the elongate guiding catheter shown in FIG. 3A taken along line A3-A3;

FIG. 4A is a schematic view of an elongate guiding catheter according to another embodiment of the present application;

FIG. 4B is an enlarged partial schematic view of the elongate guiding catheter shown in FIG. 4A;

FIG. 4C is a cross-sectional view of the elongate guiding catheter shown in FIG. 4A taken along line A4-A4;

FIG. 5A is a schematic view of an elongate guiding catheter according to another embodiment of the present application;

FIG. 5B is an enlarged partial schematic view of the elongate guiding catheter shown in FIG. 5A;

FIG. 5C is a cross-sectional view of the elongate guiding catheter shown in FIG. 5A taken along line A5-A5;

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

FIG. 6B is an enlarged partial schematic view of the elongate guiding catheter shown in FIG. 6A;

FIG. 6C is a cross-sectional view of the elongate guiding catheter shown in FIG. 6A taken along line A6-A6;

FIG. 6D is a cross-sectional view of the elongate guiding catheter shown in FIG. 6A taken along line C1-C1;

FIG. 7A is a schematic view of an elongate guiding catheter according to another embodiment of the present application;

FIG. 7B is an enlarged partial schematic view of the elongate guiding catheter shown in FIG. 7A;

FIG. 7C is a cross-sectional view of the elongate guiding catheter shown in FIG. 7A taken along line A7-A7;

FIG. 8A is a schematic view of an elongate guiding catheter according to another embodiment of the present application;

FIG. 8B is an enlarged partial schematic view of the elongate guiding catheter shown in FIG. 8A;

FIG. 8C is a cross-sectional view of the elongate guiding catheter shown in FIG. 8A taken along line A8-A8;

FIG. 9A is a schematic view of an elongate guiding catheter according to another embodiment of the present application;

FIG. 9B is an enlarged partial schematic view of the elongate guiding catheter shown in FIG. 9A;

FIG. 9C is a cross-sectional view of the elongate guiding catheter shown in FIG. 9A taken along line A9-A9;

FIG. 10A is a schematic view of an elongate guiding catheter according to another embodiment of the present application;

FIG. 10B is an enlarged partial schematic view of the elongate guiding catheter shown in FIG. 10A;

FIG. 10C is a cross-sectional view of the elongate guiding catheter shown in FIG. 10A taken along line A10-A10.

Reference numerals:

100. A first tube body; 200. a second tube body; 300. a first balloon; 400. a conduit; 500. a second balloon; 600. a first interface; 700. a second interface; 800. a connecting rod; 110. a first flow passage; 120. a first flow port; 210. a second flow passage; 220. a second flow port; 201. a first section; 202. a second section; 203. a transition section; 310, 510, an inflation lumen; 320, 520; a developing member; 410. a channel; 420. an instrument inlet; 430. a developable tip; 401. an outer layer; 402. an intermediate layer; 403. an inner layer.

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 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 application 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 by 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 application. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the description of the present application, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.

Unless specifically stated or limited otherwise, the terms "mounted," "connected," "secured" and the like are to be construed broadly and may be, for example, fixedly connected or detachably connected or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

In percutaneous coronary intervention, instruments such as a guide wire and a microcatheter are pushed from an extension catheter to a desired position in a coronary artery, however, since the radial dimension of a pushing part of the extension guiding catheter in the related art is too large, the delivery of the instruments such as the guide wire and the microcatheter is not facilitated, and thus the operation difficulty is increased. In view of the above problems, embodiments of the present application provide an extension guide catheter, which can enhance the axial supporting force of the extension guide catheter, prevent the guide wire from moving, and have an anchoring effect on the guide catheter, so as to more smoothly deliver instruments such as guide wires, micro-catheters, etc.

The following describes the technical scheme of the embodiment of the present application in detail with reference to the accompanying drawings.

Example 1

Referring to fig. 1A, 2A and 4A, an embodiment of the present application provides an extended guiding catheter, which includes an operation portion, a pushing portion and a catheter 400 sequentially connected from a proximal end to a distal end; the catheter 400 is provided with a channel 410 which is communicated along the axial direction and used for conveying the instrument, one side of the channel 410 facing the proximal end is provided with an instrument inlet 420, the periphery of the pushing part is wound with a first balloon 300, and the periphery of the catheter 400 is wound with a second balloon 500; the operation portion is provided with a first port 600 and a second port 700, the first port 600 communicates with the first balloon 300 through the first flow passage 110, and the second port 700 communicates with the second balloon 500 through the second flow passage 210.

The pushing part comprises a first pipe body 100 and a second pipe body 200, the first flow channel 110 is arranged in the first pipe body 100, and the second flow channel 210 is arranged in the second pipe body 200; the first tube body 100 is provided with a first flow port 120 near one end of the catheter 400, the first flow port 120 is positioned in the first balloon 300, the second tube body 200 extends into the second balloon 300 after penetrating out of the first balloon 300, the end part of the distal end of the second tube body 200 is provided with a second flow port 220, and the second flow port 220 is positioned in the second balloon 300.

The extension guide catheter of the embodiment of the application has a proximal end which is operated by a doctor and a distal end which is operated far from the doctor.

In one aspect of the extension guide catheter provided in the embodiment of the application, since the first balloon 300 is disposed at the periphery of the pushing portion, fluid and other mediums can be injected into the first balloon 300 from the first flow channel 110, when the first balloon 300 is pressurized, the axial supporting force of the extension guide catheter 400 can be enhanced, and meanwhile, the guide wire can not move, so that the phenomenon of guide wire displacement caused by the withdrawal of the microcatheter in the related art is avoided, and further, the operation is not affected.

On the other hand, since the second balloon 500 is disposed at the outer periphery of the catheter 400, a fluid or the like medium can be injected into the second balloon 500 through the second flow channel 210, the distal end of the catheter 400 can be anchored at a desired position in the blood vessel of the human body when the second balloon 500 is pressurized, and the axial supporting force of the extension guide catheter 400 can be further enhanced. This can avoid the defect of the opposite movement of the prolonged guiding catheter in the related art in the blood vessel due to insufficient axial supporting force or heart beat, and can smoothly convey the micro catheter and other instruments in the catheter 400.

In one implementation, the first interface 600 and the second interface 700 of the operation portion may be HUB interfaces for connecting to external devices for pressurizing or depressurizing the first balloon 300 and the second balloon 500 through the external devices. The external device can be a syringe, the medium can be normal saline, and the normal saline is injected into the first interface and the second interface through the syringe to expand the two balloons.

The first balloon 300 and the second balloon 500 comprise expandable or contractible inflatable bodies, the inflatable bodies of the first balloon 300 are arranged around the periphery of the pushing part, the inflatable bodies of the second balloon 500 are arranged around the periphery of the catheter 400, the interior of the inflatable bodies form inflatable chambers, the inflatable chambers 310 of the first balloon 300 are in fluid communication with the first interface 600 through the first flow channel 110, and the inflatable chambers 510 of the second balloon 500 are in fluid communication with the second interface 700 through the second flow channel 210.

During pressurization, fluid introduced through the first port 600 may be injected into the first balloon 300 through the first flow port 120 of the first flow channel 120, fluid introduced through the second port 700 may be injected into the second balloon 500 through the second flow port 220 of the second flow channel 210, the first balloon 300 may be expanded to fix the guide wire in the blood vessel, and the second balloon 500 may be expanded to anchor the catheter 400 at a desired position in the blood vessel of the human body.

In this embodiment, the first interface 600 and the second interface 700 may be fixed as one body; or the first interface 600 and the second interface 700 may be separately provided; wherein the first interface 600 is disposed along a length direction of the extension guide catheter, and the second interface 700 is disposed obliquely with respect to the first interface 600; or the second port 700 is disposed along the length of the elongate guiding catheter, and the first port 600 is disposed obliquely with respect to the second port 700.

The first balloon 300 includes a first sealing end disposed toward the proximal end and a second sealing end disposed toward the distal end, wherein the proximal end is an end that is close to the operation of the doctor, i.e., an end that is close to the operation portion, and the distal end is an end that is far away from the operation of the doctor, and the first sealing end is sealingly connected to the wall of the first tube body 100 and/or the second tube body 200, and the second sealing end is sealingly connected to the connecting rod 800 and/or the wall of the second tube body 200.

In this embodiment, the second pipe body 200 includes a first section 201 and a second section 202 integrally connected; the first section 201 is arranged close to the operating part, the second section 202 is arranged close to the second balloon 500 and is arranged radially on the side facing away from the instrument inlet 420, wherein the first flow opening 120 and the instrument inlet 420 are arranged radially on the same side.

The first section 201 of the second tube body 200 and the first tube body 100 are combined, for example, may be fixed into a whole, the second section 202 is disposed on the outer side of the catheter 400, and the inner diameter of the second section 202 may be smaller than that of the first section 201, so that the radial maximum size of the second section 202 and the catheter 400 after being juxtaposed can be reduced, and further the extension guiding catheter can be smoothly pushed in a blood vessel, and at the same time, at least part of the connecting rod 800 is also facilitated to be inserted into the first tube body 100.

In this embodiment, the second pipe body 200 further includes a transition section 203 connected to the first section 201 and the second section 202; at least a portion of the transition section 203 is located within the first balloon 300, the transition section 203 passing out of the first balloon 300 on a side facing away from the instrument inlet; or the transition section 203 is located at one side of the first balloon 300 close to the operation portion, and one side of the transition section 203, which is radially away from the instrument inlet, sequentially penetrates into and out of the first balloon 300, so that the second flow channel 210 is isolated from the inner space of the first balloon 300, and the expansion of the first balloon 300 is not affected.

In one implementation manner, the first section 201, the second section 202 and the transition section 203 may be integrally formed, for example, part of the pipe walls of the first section 201, the second section 202 and the transition section 203 may be integrally formed, or the first section 201 extends from the proximal end to the distal end and the inner diameter thereof gradually decreases to form the transition section 203, and the transition section 203 extends from the proximal end to the distal end to form the second section 202.

It should be noted that, referring to fig. 1B, in the present embodiment, the first section 201 of the second tube body 200 is sleeved outside the first tube body 100, the transition section 203 is configured to be straight, or the transition section 203 may be configured to be curved, and the transition section 203 is disposed on a side facing away from the instrument inlet. The inner diameter of the first section 201 of the second tube 200 is greater than that of the first tube 100, the first tube 100 is flat, the first tube 100 penetrates from the wall of the second tube 200, then penetrates from the wall of the second tube 200, and the first balloon 300 is disposed near the first tube 100 at the penetrating portion of the second tube 200.

In one implementation, the first tube 100 and the second tube 200 are hollow tubes, and may be made of metal materials, for example, the first tube 100 may be a hypotube. Or the material of the first tube body 100 may include nickel-titanium alloy or stainless steel. Thus, the first tube body 100 has higher hardness and good kink resistance, and compared with the extension guiding catheter in the related art, the extension guiding catheter in the embodiment has better pushing performance under the same size.

In one implementation, the first tube 100 and/or the second tube 200 may be made of a relatively stiff polymeric material, such as nylon or PEBAX (polyether block polyamide), which ensures that no substantial deformation occurs in the presence of high pressure in the second flow path, thereby ensuring the throughput of the medium and not affecting the delivery of the instrument.

In this embodiment, the pushing portion may be provided with the connecting rod 800, or the connecting rod 800 may not be provided. Referring to fig. 1A, 1B and 1C, the pushing part includes a connection rod 800 connected between the first tube body 100 and the catheter 400, the connection rod 800 is arranged in parallel with the second tube body 200, and the instrument inlet 420 and the second tube body 200 are respectively arranged at two radial sides of the connection rod 800; the first balloon 300 is wound around the connection between the first tube 100 and the connecting rod 800, and the first flow port 120 is disposed adjacent to the connection.

In this embodiment, the connecting rod 800 has a straight rod shape, and has a high deformation resistance, and may be a solid structure, or a partially solid structure at the end where the connecting rod 800 is connected to the second pipe body 200. In one implementation, the connecting rod 800 may be made of a metallic material, including, but not limited to, stainless steel.

In this embodiment, the first balloon 300 is wound around the connection portion between the first tube 100 and the connecting rod 800, and the connection portion between the first tube 100 and the connecting rod 800 may be located in the first balloon 300. As shown in fig. 2A and 2B, the first sealing end is connected to the outer tube wall of the first tube body 100, and the second sealing end is connected to the outer wall of the second tube body 200 and the inner wall of the first tube body. 1A and 1B, the connecting rod 800 is arranged in parallel with the second section 202 of the second tube body 200, the first sealing end of the first balloon 300 is connected to a part of the outer tube wall of the first tube body 100 and a part of the outer tube wall of the second tube body 200, and the second sealing end is connected to a part of the connecting rod 800 and a part of the outer tube wall of the second section 202. Therefore, the structure formed by connecting the connecting rod 800 and the first pipe body 100 is positioned in the first balloon 300, so that the appearance consistency of the pushing part is ensured, the pushing part has higher strength and better pushing property.

In some embodiments, as shown in fig. 4A and 4B, the first sealing end is connected to a portion of the outer tube wall of the first tube body 100 and a portion of the outer tube wall of the second tube body 200, and the second sealing end is connected to a portion of the outer tube wall of the first tube body 100 and a portion of the outer tube wall of the second tube body 200.

In some embodiments, as shown in fig. 9A and 9B, when the pushing portion is provided with the connecting rod 800, the first balloon 300 may also be wound around the first tube 100 near the connecting rod, where the connection between the first tube 100 and the connecting rod is located outside the first balloon. Referring to fig. 1B, in the present embodiment, a distal end side of the first tube body 100 is provided with an inclined notch, and the connecting rod 800 is axially inserted into the inclined notch and fixedly connected to an inner wall surface at the inclined notch; wherein a partially sloped cut is used to form the first flow opening 120. In one implementation manner, the axial included angle between the inclined notch and the pushing part can be 0-90 degrees, and the inclined notch is arranged on one hand to facilitate the insertion of the connecting rod 800; on the other hand, in order to have a good hardness transition.

As shown in fig. 1B, in this embodiment, the diameter of the connecting rod 800 may be smaller than the inner diameter of the first tube body 100, after the connecting rod 800 is inserted into the inclined incision, only a part of the space of the inclined incision is occupied, and the medium in the first tube body 100 may be output from the remaining space of the inclined incision into the first balloon 300.

In addition, after the connecting rod 800 is inserted into the inclined notch, the outer wall surface of the connecting rod 800 is fixedly connected with the inner wall surface of the first pipe body 100, for example, the connecting rod 800 and the first pipe body 100 can be fixedly connected in a welding mode, so that the connection area of the connecting rod 800 and the first pipe body 100 can be increased, and the connection strength of the connecting rod 800 and the first pipe body 100 is further improved.

Referring to fig. 4A and fig. 4B, in another implementation manner, the connecting rod 800 may be fixedly connected to an axial end of the first tube body 100, where the connecting rod 800 and the axial end may be fixed by bonding or welding to close off a port of the axial end, the wall of the first tube body 100 at the connection portion is provided with an opening for forming the first circulation port 120, the opening is located in the first balloon 300, an end portion of the first tube body 100 in the distal direction is located outside the first balloon 300, and the second tube body 200 passes through the first balloon 300 and is penetrated out along the axial direction of the first tube body 100.

Referring to fig. 2A and 2B, in one implementation, the pushing portion may be directly connected to the catheter 400 without the connecting rod 800, the first balloon 300 is disposed adjacent to the instrument inlet 420, a distal end side of the first tube 100 is provided with an inclined incision, the inclined incision at the distal end of the first tube 100 penetrates out of the second tube 200 inside the first balloon 300 and penetrates out of the wall of the second tube 200 on the same side of the instrument inlet 420 in a radial direction, the portion penetrating out of the second tube 200 is provided with the first circulation port 120, and the first circulation port 120 is located in the first balloon 300, so that the second section 202 of the second tube 200 is formed on a side far away from the instrument inlet without affecting the delivery of the microcatheter, the guide wire or the like, and the inclined incision distal end extends out of the first balloon 300 to be connected to the catheter 400, and the extension portion of the inclined incision may be connected to the outer/inner layer surface of the catheter 400, or the outer/inner layer of the catheter 400, or the connection between the inner/outer layer of the catheter 400 may be enhanced, and the transition stability may be extended.

In this embodiment, developing components are disposed inside the first balloon 300 and the second balloon 500, and the developing components may be made of metal or resin, etc., and the developing components in the first balloon 300 are fixed to the first tube 100, the second tube 200 and/or the connection rod 800, and the developing components in the second balloon 500 are fixed to the catheter 400.

In some embodiments, the developing component may be in an annular structure, and the developing component in the first balloon 300 may be sleeved at the axial overlapping position of the first tube 100 and the connecting rod 800, so as to improve the connection stability of the first tube 100 and the connecting rod 800. The visualization component within the second balloon 500 may be sleeved around the periphery of the catheter.

Referring to fig. 1A and 1B, in this embodiment, the catheter 400 is provided with an angled instrument inlet 420 on the proximal side facing and a visualization tip 430 on the distal side. Catheter 400 is a composite structure comprising an outer layer 401, an intermediate layer 402, and an inner layer 403; the outer layer of the catheter 400 is made of different polymer materials with gradually decreasing proximal to distal hardness, which not only provides better support for the second balloon 500, but also allows the catheter 400 to not deform when the second balloon 500 is pressurized.

Wherein, because the outer layer is made of different polymer materials with gradually reduced hardness from the proximal end to the distal end, the hardness of the catheter 400 gradually becomes smaller along the direction from the proximal end to the distal end, so that the deformation can be avoided, and the catheter is easier to pass through the tortuous lesion part in the blood vessel of the human body. The phenomena of blood vessel ischemia or blood vessel injury and the like easily caused during operation due to the oversized distal end size or non-tapered tip of the extension guide catheter in the related art are avoided.

In one implementation, intermediate layer 402 may be comprised of a metal spring and a braid; the material of the inner layer 403 may include HDPE (HIGH DENSITY Polyethylene) or PTFE (Poly tetra fluoroethylene ).

In one implementation, intermediate layer 402 may also be comprised of a separately provided metal spring, or a separately provided braid.

The gradual decrease in stiffness of the catheter 400 in the proximal to distal direction may achieve the effect of varying stiffness of the catheter 400 by varying the pitch of the spring or the density of the braid weave, in addition to varying the material of the outer tube.

It is understood that the middle layer 402 may not be limited to be composed of a metal spring and a braid, or to be composed of a metal spring disposed alone, or to be composed of a braid disposed alone, and the structure of the middle layer is not limited in the present application, for example, in other embodiments, the middle layer 402 may be composed of a tube material cut by rotary cutting.

Example two

Referring to fig. 3A, 5A and 6A, an embodiment of the present application provides an extended guiding catheter, which includes an operation portion, a pushing portion and a catheter 400 sequentially connected from a proximal end to a distal end; the catheter 400 is provided with a channel 410 which is communicated along the axial direction and used for conveying the instrument, one side of the channel 410 facing the proximal end is provided with an instrument inlet 420, the periphery of the pushing part is wound with a first balloon 300, and the periphery of the catheter 400 is wound with a second balloon 500; the operation part is provided with a first interface 600 and a second interface 700, the first interface 600 is communicated with the first balloon 300 through a first flow passage 110, and the second interface 700 is communicated with the second balloon 500 through a second flow passage 210; the pushing part comprises a first pipe body 100 and a second pipe body 200, the first flow channel 110 is arranged in the first pipe body 100, and the second flow channel 210 is arranged in the second pipe body 200; the first tube body 100 is provided with a first flow port 120 near one end of the catheter 400, the first flow port 120 is positioned in the first balloon 300, the second tube body 200 extends into the second balloon 300 after penetrating out of the first balloon 300, the end part of the distal end of the second tube body 200 is provided with a second flow port 220, and the second flow port 220 is positioned in the second balloon 300. According to the extension guide catheter provided by the embodiment of the application, when the first balloon 300 is pressurized, the axial supporting force of the extension guide catheter 400 can be enhanced, meanwhile, the guide wire can not move, the phenomenon of guide wire displacement caused by the withdrawal of the microcatheter in the related art is avoided, and further, the operation is not influenced. When the second balloon 500 is inflated, the catheter 400 can be anchored at a desired location within the vessel, and the axial support force of the elongate guiding catheter is further enhanced.

It should be noted that the extension guide tube of the second embodiment is basically the same as that of the first embodiment, except that the pushing portion of the second embodiment is different from that of the first embodiment, for example, the first tube 100 and the second tube 200 of the first embodiment are combined in a different manner from that of the first embodiment.

Referring to fig. 3B, 5B, 6B, 3C, 5C, 6C and 6D, in the present embodiment, the first section 201 of the second tube body 200 is accommodated in the first tube body 100, the transition section 203 is configured to be curved, and the transition section 203 passes through the first circulation port 120 and then winds radially to a side facing away from the instrument inlet 420. So configured, not only does the first flow channel 110 and the second flow channel 210 separate, but the radial dimension of the pusher can be reduced, the overall size is smaller, and the effective use inner diameter in the guide catheter 400 is increased. In addition, the space of the first flow port 120 is fully utilized, and the first flow port 120 has a dual function, namely, the medium can be injected into the first balloon 300, and the transition section 203 of the second pipe body 200 can be penetrated out so as to connect the first section 201 in the first pipe body 100 with the second section 202 outside the first pipe body 100.

In this embodiment, since the transition section 203 of the second tube body 200 is disposed in the first balloon 300, the outer space of the guiding catheter is not occupied, and the connection strength and connection stability of the first section 201 and the second section 202 and the overall tightness of the second flow channel 210 are also ensured.

As shown in fig. 3B, in the present embodiment, when the pushing portion is not provided with the connecting rod 800, the first sealing end of the first balloon 300 is connected to the outer tube wall of the first tube body 100, and the second sealing end is connected to a portion of the inner tube wall of the first tube body 100 and a portion of the outer tube wall of the second tube body 200.

As shown in fig. 5B, in the present embodiment, when the pushing portion is provided with the connecting rod 800, the first balloon 300 is wound around the connection portion between the first tube 100 and the connecting rod 800, and the connection portion between the first tube 100 and the connecting rod 800 may be located in the first balloon 300. Wherein the connecting rod 800 is disposed in parallel with the second section 202 of the second tube body 200, the first sealed end is connected to the outer tube wall of the first tube body 100, and the second sealed end is connected to the outer wall of the second tube body 200 and the connecting rod 800. Therefore, the structure formed by connecting the connecting rod 800 and the first pipe body 100 is positioned in the first balloon 300, so that the appearance consistency of the pushing part is ensured, the pushing part has higher strength and better pushing property.

As shown in fig. 6B, when the pushing portion is provided with the connecting rod 800, the first balloon 300 may also be wound around the first tube 100 near the connecting rod, in which case, the connection between the first tube 100 and the connecting rod is located outside the first balloon 300.

Example III

Referring to fig. 7A, 8A, 9A and 10A, an embodiment of the present application provides an extended guiding catheter, which includes an operation portion, a pushing portion and a catheter 400 sequentially connected from a proximal end to a distal end; the catheter 400 is provided with a channel 410 which is communicated along the axial direction and used for conveying the instrument, one side of the channel 410 facing the proximal end is provided with an instrument inlet 420, the periphery of the pushing part is wound with a first balloon 300, and the periphery of the catheter 400 is wound with a second balloon 500; the operation part is provided with a first interface 600 and a second interface 700, the first interface 600 is communicated with the first balloon 300 through a first flow passage 110, and the second interface 700 is communicated with the second balloon 500 through a second flow passage 210; the pushing part comprises a first pipe body 100 and a second pipe body 200, the first flow channel 110 is arranged in the first pipe body 100, and the second flow channel 210 is arranged in the second pipe body 200; the first tube 100 is provided with a first circulation port 120 near one end of the catheter 400, the first circulation port 120 is located in the first balloon 300, and the second tube 100 penetrates out of the first balloon 300 and then is connected with the second balloon 500. According to the extension guide catheter provided by the embodiment of the application, when the first balloon 300 is pressurized, the axial supporting force of the extension guide catheter can be enhanced, meanwhile, the guide wire can not move, the phenomenon of guide wire displacement caused by the withdrawal of the microcatheter in the related art is avoided, and further, the operation is not influenced. When the second balloon 500 is inflated, the catheter 400 can be anchored at a desired location within the vessel, and the axial support force of the elongate guiding catheter is further enhanced.

It should be noted that the extension guide pipe of the second embodiment is basically 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, for example, the combination manner of the first tube 100 and the second tube 200 and the arrangement manner of the connecting rod 800 of the second embodiment are different from those of the first embodiment.

Referring to fig. 7B, 8B, 9B, 7C, 8C, and 9C, in the present embodiment, the second pipe 200 is disposed in parallel with the first pipe 100, and the second pipe 200 is disposed on a side facing away from the first flow port 120 in a radial direction. Wherein, the first pipe body 100 and the second pipe body 200 can be set to be straight, and the two are parallel to each other, so that the effective inner diameters of the first pipe body 100 and the second pipe body 200 are guaranteed, the punching speed of the first balloon 300 and the second balloon 500 is faster, in addition, the strength of the pushing part is higher, and the pushing part has better pushing property.

In this embodiment, the pushing portion may be provided with the connecting rod 800, or may not be provided with the connecting rod 800, see fig. 10A, 10B and 10C, and in the case where the pushing portion is provided with the connecting rod 800, in order to further improve the strength of the pushing portion, the connecting rod 800 may be inserted into the first tube 100, and two ends of the connecting rod 800 are respectively connected between the first interface 600 and the catheter 400.

As shown in fig. 7B and 7C, in the present embodiment, when the pushing portion is not provided with the connecting rod 800, the first sealing end of the first balloon 300 is connected to a portion of the outer tube walls of the first tube body 100 and the second tube body 200, and the second sealing end is connected to a portion of the inner tube wall of the first tube body 100 and a portion of the outer tube wall of the second tube body 200.

As shown in fig. 8B, when the pushing portion is provided with the connecting rod 800, the first balloon 300 is wound around the connection portion between the first tube 100 and the connecting rod 800, and the connection portion between the first tube 100 and the connecting rod 800 may be located at a position of the first balloon 300 near the second sealing end. The connecting rod 800 is arranged in parallel with the second section 202 of the second pipe body 200, the first sealing end is connected with the outer pipe wall of the first pipe body 100 and the second pipe body, and the second sealing end is connected with the outer pipe wall of the second pipe body 200 and the connecting rod 800, so that the connection strength of the first balloon 300 can be improved, and in addition, the pushing part can have higher strength and better pushing performance.

As shown in fig. 9B and 9C, in one implementation manner, when the pushing portion is provided with the connecting rod 800, the first balloon 300 may also be wound around the first tube 100 near the position of the connecting rod 800, in this case, the connection between the first tube 100 and the connecting rod 800 is located outside the first balloon 300, the first balloon 300 is located on the proximal side of the connection, and the first connection end and the second connection end of the first balloon 300 are both connected to part of the outer tube walls of the first tube 100 and the second tube 200.

As shown in fig. 10B and 10C, in one implementation, when the pushing portion is provided with the connecting rod 800, and both ends of the connecting rod 800 are respectively connected to the first interface 600 and the catheter 400, since the portion of the connecting rod 800 near the proximal end is accommodated in the first tube 100, the first sealing end of the first balloon 300 is connected to a portion of the outer tube walls of the first tube 100 and the second tube 200, and the second sealing end is connected to the outer tube wall of the second tube 200 and the connecting rod 800.

As can be seen from the above embodiments, the extension guide catheter provided by the present application, by combining the first tube body 100 and the second tube body 200, enables the pushing portion to form the first flow channel 110 communicating with the first balloon 300 and the second flow channel 210 communicating with the second balloon 500, and the two flow channels are mutually independent, so as to control the contraction and expansion of the first balloon 300 and the second balloon 500 through the medium such as the fluid, respectively, so that the axial supporting force of the extension guide catheter 400 can be enhanced, the guide wire does not move, the anchoring effect is provided for the guide catheter 400, and the devices such as the micro-catheter can be smoothly conveyed, for example, the devices such as the guide wire, the micro-catheter can be rapidly withdrawn, the problems such as the occurrence of the blood vessel blockage or the blood vessel injury can be avoided, and the convenience can be provided for the operation of doctors in the surgery of complex lesions such as CTO.

The foregoing description of embodiments of the application has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described. The terminology used herein was chosen in order to best explain the principles of the embodiments, the practical application, or the improvement of technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. An elongate guiding catheter, comprising:

The pushing part comprises a first pipe body and a second pipe body, the first flow channel is arranged in the first pipe body, and the second flow channel is arranged in the second pipe body; a first flow port is formed in one end, close to the catheter, of the first tube body, the first flow port is positioned in the first balloon, the second tube body penetrates out of the first balloon and then extends into the second balloon, a second flow port is formed in the end part of the distal end of the second tube body, and the second flow port is positioned in the second balloon;

The second pipe body comprises a first section and a second section which are connected into a whole;

The first section is arranged close to the operation part, the second section is arranged close to the second balloon and is arranged on one side away from the instrument inlet in the radial direction, and the first circulation port and the instrument inlet are arranged on the same side in the radial direction;

The first tube body is connected with the catheter, the first balloon is arranged at a position adjacent to the instrument inlet, one side of the distal end of the first tube body is provided with an inclined incision, the inclined incision penetrates out of the second tube body in the first balloon, and penetrates out of the tube wall of the second tube body at the same side of the instrument inlet in the radial direction;

the inclined incision is provided with first circulation opening at the position of wearing out the second body, first circulation opening is located first sacculus, the distal end of inclined incision extends first sacculus and with the pipe connection.

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

The first section of the second pipe body is sleeved outside the first pipe body.

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

the second pipe body further comprises a transition section connected to the first section and the second section;

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

The pushing part further comprises a connecting rod connected between the first pipe body and the guide pipe, the connecting rod and the second pipe body are arranged in parallel, and the instrument inlet and the second pipe body are respectively arranged on two radial sides of the connecting rod;

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

The connecting rod is inserted into the inclined notch and fixedly connected with the inner wall surface of the second pipe body close to the inclined notch, wherein part of the inclined notch is used for forming the first flow opening; or (b)

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

The first balloon comprises a first sealing end arranged towards the proximal end and a second sealing end arranged towards the distal end, the first sealing end is in sealing connection with the first tube body and/or the tube wall of the second tube body, and the second sealing end is in sealing connection with the first tube body and/or the tube wall of the second tube body.

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

The first balloon comprises a first sealing end arranged towards the proximal end and a second sealing end arranged towards the distal end, the first sealing end is in sealing connection with the first tube body and/or the tube wall of the second tube body, and the second sealing end is in sealing connection with the connecting rod and/or the tube wall of the second tube body.

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

an included angle is formed between the first interface and the second interface;

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

The inside of first sacculus and second sacculus is provided with developing part, developing part in the first sacculus is fixed in first body, perhaps developing part in the first sacculus is fixed in second body and/or the connecting rod, developing part in the second sacculus is fixed in the pipe.

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

The first pipe body and/or the second pipe body are/is made of metal materials or high polymer materials; or (b)