CN115054807A

CN115054807A - Extension guide catheter

Info

Publication number: CN115054807A
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: 2022-09-16
Anticipated expiration: 2042-06-27

Abstract

The present application relates to an extension guide catheter. The extension guiding catheter comprises an operation part, 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, one side of the channel, which faces the near 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 operating part is provided with a first interface and a second interface, the first interface is communicated with the first balloon through a first flow passage, and the second interface is communicated with the second balloon through a second flow passage; the pushing part comprises a first pipe body and a second pipe body, a first flow passage is arranged in the first pipe body, and a second flow passage is arranged in the second pipe body; first body is close to the one end that is close to the pipe and is equipped with first circulation mouth, and first circulation mouth is located first sacculus, and the second body is worn out and is extended to in the second sacculus after first sacculus, and the scheme that this application provided can the anchoring seal wire, also has the anchoring effect to the pipe simultaneously, can carry apparatus such as little pipe more smoothly.

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.

When the extension catheter in the related technology is used in combination with instruments such as a micro catheter and the like which have smaller inner diameters and do not have a 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; moreover, in the percutaneous coronary intervention, a guide wire, a micro-catheter or other device is pushed from the extension catheter to a desired position in the coronary artery, however, the radial supporting force of the extension guide catheter is insufficient in the related art, so that the delivery of the micro-catheter or other device is not facilitated, and the operation difficulty is increased.

In view of the above, it is desirable to provide an extension guiding catheter which has good anchoring support force and can avoid displacement of the guide wire.

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 smoothly convey instruments such as the guide wire, a micro-catheter and the like.

The present application provides an extension guide catheter comprising:

the operation part, 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, an instrument inlet is formed in one side, facing the near end, of the channel, a first balloon is wound on the periphery of the pushing part, and a second balloon is wound on 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 passage, and the second interface is communicated with the second balloon through a second flow passage;

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 first pipe body is close to the one end of pipe is equipped with first circulation mouth, first circulation mouth is located in the first sacculus, the second pipe body is worn out extend to behind the first sacculus in the second sacculus, the tip of second pipe body distal end is provided with second circulation mouth, second circulation mouth is located in the second sacculus.

In one embodiment, the first section of the second tube is sleeved outside the first tube; or

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

The second tube and the first tube are arranged in parallel.

In one embodiment, 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 operating part, the second section is arranged close to the second balloon and is arranged on one side deviating from the device inlet along the radial direction, and the first circulating port and the device inlet are arranged on the same side along 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; alternatively, the transition section is located on a side of the first balloon adjacent to the operative portion, the transition section passing through the first balloon on a side facing away from the instrument inlet.

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

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

In one embodiment, the first tube is connected to the catheter, the first balloon is disposed adjacent to the device inlet, and an oblique incision is formed at a distal side of the first tube, the oblique incision penetrating the second tube inside the first balloon and penetrating a wall of the second tube radially at a same side of the device inlet;

the inclined cut is provided with a first circulation port at a position penetrating out of the second tube body, the first circulation port is located in the first balloon, and the far end of the inclined cut extends out of the first balloon and is connected with the catheter.

In one embodiment, the first tube 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 second tube body close to the inclined cut, wherein part of the inclined cut is used for forming the first circulation port; 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 an opening used for forming the first circulation opening is formed in the pipe wall of the connecting position of the first pipe body.

In one embodiment, the first balloon includes a first sealing end disposed toward the proximal end and a second sealing end disposed toward the distal end, the first sealing end is sealingly connected to the tube wall of the first tube and/or the second tube, and the second sealing end is sealingly connected to the tube wall of the first tube and/or the second tube.

In one embodiment, the first balloon includes a first sealing end disposed toward the proximal end and a second sealing end disposed toward the distal end, the first sealing end is connected to the tube wall of the first tube and/or the second tube in a sealing manner, and the second sealing end is connected to the tube wall of the connecting rod and/or the second tube in a sealing manner.

In one embodiment, the first interface and the second interface form an included angle therebetween;

the first interface and the second interface are arranged into a whole; or the first interface and the second interface are arranged separately.

In one embodiment, a developing member is disposed inside the first balloon and the second balloon, the developing member in the first balloon is fixed to a first tube, or the developing member in the first balloon is fixed to the second tube and/or the connecting rod, and the developing member in the second balloon is fixed to the catheter.

In one embodiment, the first tube and/or the second tube is made of a metal material or a polymer material; or

The catheter is a composite structure consisting of an outer layer, a middle 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:

the extension guide catheter that this application embodiment provided, on the one hand, because first sacculus sets up in the periphery of propelling movement portion, media such as fluid can pour into first sacculus from first fluid passage into, when first sacculus is pressurized, can not only strengthen the axial holding power of extension catheter, 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, and then can not influence going on of operation. On the other hand, because the second balloon is arranged on the periphery of the catheter, a medium such as fluid can be injected into the second balloon through the second flow passage, when the second balloon is inflated, the far end of the catheter can be anchored at a desired position in a human blood vessel, and the axial supporting force of the extension guide catheter is further enhanced. Therefore, the defect that the prolonged guide catheter generates reverse motion in blood vessels due to insufficient axial supporting force or heart beating and the like in the related technology can be avoided, and instruments such as guide wires, micro-catheters and the like can be smoothly conveyed in the catheter.

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. 1A is a schematic structural 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 taken along line 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 structural 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 taken along line A2-A2;

FIG. 3A is a schematic structural 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 structural 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 structural 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 elongated finger guide tube shown in FIG. 5A taken along A5-A5;

FIG. 6A is a schematic structural 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 elongated finger guide tube shown in FIG. 6A taken along A6-A6;

FIG. 6D is a cross-sectional view of the elongated finger guide tube shown in FIG. 6A taken along line C1-C1;

FIG. 7A is a schematic structural 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 structural 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 elongated finger guide tube shown in FIG. 8A taken along line A8-A8;

FIG. 9A is a schematic structural 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 elongated finger guide tube shown in FIG. 9A taken along line A9-A9;

FIG. 10A is a schematic structural 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 elongated finger guide tube shown in fig. 10A taken along line a10-a 10.

Reference numerals:

100. a first pipe 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 circulation port; 210. a second flow passage; 220. a second flow port; 201. a first stage; 202. a second stage; 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 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 percutaneous coronary intervention, a guide wire, a micro-catheter and other instruments are pushed to a desired position in a coronary artery from an extension catheter, however, the radial size of the pushing part of the extension guiding catheter in the related art is too large, which is not beneficial to the delivery of the guide wire, the micro-catheter and other instruments, and thus increases the difficulty of the operation. 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, anchor the catheter, and smoothly deliver devices such as the guide wire and the microcatheter.

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

Example one

Referring to fig. 1A, 2A and 4A, an embodiment of the present application provides an extension guide catheter, including an operating portion, a pushing portion and a catheter 400 connected in sequence from a proximal end to a distal end; the catheter 400 is provided with a channel 410 which is penetrated along the axial direction and used for delivering 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 is communicated with the first balloon 300 through the first flow passage 110, and the second port 700 is communicated 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 passage 110 is arranged in the first pipe body 100, and the second flow passage 210 is arranged in the second pipe body 200; one end of the first tube 100 close to the catheter 400 is provided with a first vent 120, the first vent 120 is located in the first balloon 300, the second tube 200 passes through the first balloon 300 and then extends into the second balloon 300, the end of the distal end of the second tube 200 is provided with a second vent 220, and the second vent 220 is located in the second balloon 300.

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.

On one hand, because the first balloon 300 is disposed at the periphery of the pushing portion, media such as fluid 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 catheter 400 can be enhanced, and the guide wire can not move, thereby avoiding the phenomenon of guide wire displacement caused by the withdrawal of the microcatheter in the related art, and further avoiding affecting the operation.

On the other hand, since the second balloon 500 is disposed on the outer periphery of the catheter 400, a medium such as a fluid can be injected into the second balloon 500 through the second flow passage 210, when the second balloon 500 is pressurized, the distal end of the catheter 400 can be anchored at a desired position in the blood vessel of the human body, and the axial supporting force of the extension guide catheter 400 is further enhanced. Therefore, the defect that the prolonged guide catheter generates reverse motion in blood vessels due to insufficient axial supporting force or heart beating and the like in the related art can be avoided, and instruments such as a microcatheter and the like can be smoothly conveyed in the catheter 400.

In one implementation, the first and

second interfaces

600 and 700 of the operation part may be HUB interfaces for connecting to an external device for pressurizing or depressurizing the first and

second balloons

300 and 500 through the external device. Wherein 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 expansion bodies, the expansion body of the first balloon 300 is wound on the periphery of the pushing part, the expansion body of the second balloon 500 is wound on the periphery of the catheter 400, an expansion cavity is formed inside the expansion body, the expansion cavity 310 of the first balloon 300 is in fluid communication with the first interface 600 through the first flow passage 110, and the expansion cavity 510 of the second balloon 500 is in fluid communication with the second interface 700 through the second flow passage 210.

When the catheter is pressurized, the fluid introduced through the first port 600 may be injected into the first balloon 300 through the first communication port 120 of the first flow channel 120, the fluid introduced through the second port 700 may be injected into the second balloon 500 through the second communication port 220 of the second flow channel 210, the guide wire may be fixed in the blood vessel after the first balloon 300 is expanded, and the catheter 400 may be anchored at a desired position in the blood vessel of the human body after the second balloon 500 is expanded.

In this embodiment, the first interface 600 and the second interface 700 may be fixed as a single body; alternatively, the first interface 600 and the second interface 700 may be separately provided; wherein the first hub 600 is disposed along the length of the elongate guiding catheter and the second hub 700 is disposed obliquely with respect to the first hub 600; alternatively, the second hub 700 is disposed along the length of the elongate guiding catheter, and the first hub 600 is disposed obliquely with respect to the second hub 700.

The first balloon 300 comprises a first sealing end arranged towards the proximal end and a second sealing end arranged towards the distal end, wherein the proximal end is the end close to the operation of the doctor, i.e. the end close to the operation part, and correspondingly, the distal end is the end far away from the operation of the doctor, the first sealing end is connected with the tube wall of the first tube 100 and/or the second tube 200 in a sealing manner, and the second sealing end is connected with the tube wall of the connecting rod 800 and/or the second tube 200 in a sealing manner.

In this embodiment, the second tube 200 includes a first section 201 and a second section 202 connected as a whole; the first section 201 is arranged close to the operating section and the second section 202 is arranged close to the second balloon 500 and radially on the side facing away from the device inlet 420, wherein the first communication opening 120 and the device inlet 420 are arranged radially on the same side.

Wherein, the first section 201 of second body 200 and first body 100 combine together to set up, for example can fix as an organic whole, and the outside of pipe 400 is located to second section 202, and the internal diameter of second section 202 can be less than first section 201, can reduce the radial maximum size after second section 202 and pipe 400 are abreast like this, and then can make the extension guide the pipe and advance smoothly in the blood vessel, also do benefit to simultaneously and locate first body 100 with at least part of connecting rod 800 grafting.

In this embodiment, the second tubular body 200 further comprises a transition section 203 connected to the first section 201 and the second section 202; at least part of the transition section 203 is located inside the first balloon 300, the transition section 203 exits the first balloon 300 on the side facing away from the instrument entrance; or the transition section 203 is positioned at one side of the first balloon 300 close to the operation part, and the transition section 203 sequentially penetrates into and out of the first balloon 300 at one side deviating from the device inlet in the radial direction, so that the second flow passage 210 is isolated from the inner space of the first balloon 300, and the expansion of the first balloon 300 is not influenced.

In one implementation, the first section 201, the second section 202, and the transition section 203 may be integrally formed, for example, part of tube 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 200 is sleeved outside the first tube 100, and the transition section 203 is arranged to be straight, or alternatively, the transition section 203 may also be arranged to be curved, and the transition section 203 is arranged on a side away from the apparatus 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 straight, the first tube 100 firstly penetrates through the tube wall of the second tube 200 and then penetrates out of the tube wall of the second tube 200, and the first balloon 300 is arranged close to the penetrating position of the first tube 100 on the second tube 200.

In one implementation, the first tube 100 and the second tube 200 are hollow tubes, and may be made of a metal material, for example, the first tube 100 may be a hypotube. Alternatively, the material of the first tube 100 may include nitinol or stainless steel. This allows the first tube 100 to have a higher stiffness and a better kink resistance, which allows the elongate guide catheter of the present embodiment to be pushed better with the same size as the elongate guide catheter of the related art.

In one implementation, the first tube 100 and/or the second tube 200 may be made of a polymer material with a relatively high hardness, for example, nylon or PEBAX (polyether block polyamide), so that it can be ensured that the second flow channel does not deform greatly when high pressure exists, and not only the passing capability of the medium is ensured, but also the transportation of the apparatus is not affected.

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

In this embodiment, the connection rod 800 is a straight rod, has high deformation resistance, and may be a solid structure, or the connection end of the connection rod 800 and the second tube 200 is a local solid structure. In one implementation, the connecting rod 800 may be made of a metallic material, such as including but not limited to stainless steel.

In this embodiment, the first balloon 300 is wound around the connection portion of the first tube 100 and the connection rod 800, and the connection portion of the first tube 100 and the connection rod 800 may be located in the first balloon 300. As shown in fig. 2A and 2B, the first sealed end is connected to the outer wall of the first tube 100, and the second sealed end is connected to the outer wall of the second tube 200 and the inner wall of the first tube. As shown in fig. 1A and 1B, wherein the connecting rod 800 and the second section 202 of the second tube 200 are disposed in parallel, the first sealed end of the first balloon 300 is connected to a portion of the outer wall of the first tube 100 and a portion of the outer wall of the second tube 200, and the second sealed end is connected to a portion of the connecting rod 800 and a portion of the outer wall of the second section 202. Can be so that connecting rod 800 and first body 100 be located first sacculus 300 by the structure that forms of being connected, guaranteed the outward appearance uniformity of propelling movement portion, make the propelling movement portion have higher intensity, have better propelling movement nature.

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

In some embodiments, as shown in fig. 9A and 9B, when the pushing part is provided with the connecting rod 800, the first balloon 300 may also be wound around the first tube 100 at a position close to the connecting rod, in which case, the joint of the first tube 100 and the connecting rod is located outside the first balloon. Referring to fig. 1B, in this embodiment, an inclined cut is formed at one side of the distal end of the first tube 100, and the connecting rod 800 is axially inserted into the inclined cut and is fixedly connected to an inner wall surface of the inclined cut; wherein the partially inclined cut-out is used to form the first circulation opening 120. In one implementation, the axial included angle between the inclined notch and the pushing part may be 0 to 90 degrees, and the inclined notch is provided for facilitating 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 connection rod 800 may be smaller than the inner diameter of the first tube 100, and after the connection rod 800 is inserted into the oblique incision, only a partial space of the oblique incision is occupied, and the medium in the first tube 100 may be output into the first balloon 300 from the remaining space of the oblique incision.

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 manner, so that the connecting area of the connecting rod 800 and the first pipe body 100 can be increased, and the connecting strength of the connecting rod 800 and the first pipe body 100 is further improved.

Referring to fig. 4A and 4B, in another implementation manner, the connection rod 800 may be further fixedly connected to an axial end of the first tube 100, the connection rod 800 may be fixed to the axial end by bonding or welding, so as to close a port of the axial end, an opening for forming the first circulation port 120 is formed in a tube wall of the connection portion of the first tube 100, the opening is located in the first balloon 300, an end portion of the first tube 100 facing the distal direction is located outside the first balloon 300, and the second tube 200 passes through the inside of the first balloon 300 and passes through along the axial direction of the first tube 100.

Referring to fig. 2A and 2B, in one implementation, the pushing portion may not be provided with the connecting rod 800, the first tube is directly connected to the catheter 400, the first balloon 300 is disposed adjacent to the device inlet 420, one side of the distal end of the first tube 100 is provided with an oblique incision, the oblique incision of the distal end of the first tube 100 penetrates through the second tube 200 inside the first balloon 300 and penetrates through the tube wall of the second tube 200 at the same side of the device inlet 420 in the radial direction, the portion penetrating through the second tube 200 is provided with the first circulation port 120, the first circulation port 120 is located inside the first balloon 300, so that the second section 202 of the second tube 200 is formed at a side away from the device inlet, which does not affect delivery of devices such as microcatheter and guide wire, and the distal end of the oblique incision extends out of the first balloon 300 to be connected to the catheter 400, and an extension of the distal end of the oblique incision may be connected to the outer layer/inner layer surface of the catheter 400, or interfacing with the outer/inner layers of catheter 400, or between the inner and outer layers, may provide a transition in connection, enhancing stability of the extension guide catheter.

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

In some embodiments, the developing component may be 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 developing component in the second balloon 500 may be sleeved on the periphery of the catheter.

Referring to fig. 1A and 1B, in this embodiment, catheter 400 is provided with a beveled instrument entrance 420 on the proximal side and a visualization tip 430 on the distal side. The conduit 400 is a composite structure composed of 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 reduced hardness from the proximal end to the distal end, so that the second balloon 500 is better supported, and the catheter 400 cannot 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 near end to the far end, the hardness of the catheter 400 is gradually reduced along the direction from the near end to the far end, thereby not only avoiding deformation, but also being easier to pass through tortuous lesion parts in human blood vessels. The phenomenon that blood vessel ischemia or blood vessel injury and the like are easily caused during operation due to the fact that the distal end of the extension guiding catheter is overlarge in size or the tip of the extension guiding catheter is in a non-conical shape when the extension guiding catheter of the related technology is used is avoided.

In one implementation, the middle layer 402 may be comprised of a metal spring and braid; the material of the inner layer 403 may include HDPE (High Density Polyethylene) or PTFE (polytetrafluoroethylene).

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

The stiffness of the catheter 400 is gradually reduced in the proximal to distal direction, and the effect of varying the stiffness of the catheter 400 can be achieved by changing the pitch of the spring or the density of the braid, in addition to the material of the outer tube.

It is understood that the intermediate layer 402 may not be limited to being composed of the metal spring and the braid, or to being composed of the separately arranged metal spring, or to being composed of the separately arranged braid, and the structure of the intermediate layer is not limited in this application, for example, in other embodiments, the intermediate layer 402 may also be formed by a tube material that is cut and hollowed out.

Example two

Referring to fig. 3A, 5A and 6A, an embodiment of the present application provides an extension guide catheter, including an operating portion, a pushing portion and a catheter 400 connected in sequence from a proximal end to a distal end; the catheter 400 is provided with a channel 410 which is penetrated along the axial direction and used for delivering 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 the first flow passage 110, and the second interface 700 is communicated 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 passage 110 is arranged in the first pipe body 100, and the second flow passage 210 is arranged in the second pipe body 200; the first tube 100 is provided with a first vent 120 near one end of the catheter 400, the first vent 120 is located in the first balloon 300, the second tube 200 extends into the second balloon 300 after penetrating out of the first balloon 300, the end of the far end of the second tube 200 is provided with a second vent 220, and the second vent 220 is located in the second balloon 300. The extension guide catheter provided by the embodiment of the application can not only enhance the axial supporting force of the extension catheter 400 when the first balloon 300 is pressurized, but also prevent the guide wire from moving, thereby avoiding the phenomenon of guide wire displacement caused by the exit of the microcatheter in the related art and further avoiding affecting the operation. 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 guide catheter is further enhanced.

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

Referring to fig. 3B, fig. 5B, fig. 6B, fig. 3C, fig. 5C, fig. 6C and fig. 6D, in the present embodiment, the first section 201 of the second tube 200 is accommodated in the first tube 100, the transition section 203 is curved, and the transition section 203 penetrates through the first circulation port 120 and then winds around a side facing away from the instrument inlet 420 in a radial direction. Thus, not only is the first flow channel 110 isolated from the second flow channel 210, but the radial dimension of the pusher can be reduced, the overall size is smaller, and the effective inner diameter of the guide catheter 400 is increased. In addition, the space of the first circulation port 120 is fully utilized, and the first circulation port 120 has a dual function of injecting a medium into the first balloon 300 and allowing the transition section 203 of the second tube 200 to pass through so as to connect the first section 201 inside the first tube 100 with the second section 202 outside the first tube 100.

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

In this embodiment, as shown in fig. 3B, when the pushing portion does not have the connecting rod 800, the first sealed end of the first balloon 300 is connected to the outer wall of the first tube 100, and the second sealed end is connected to a portion of the inner wall of the first tube 100 and a portion of the outer wall of the second tube 200.

As shown in fig. 5B, in this embodiment, when the pushing portion is provided with the connecting rod 800, the first balloon 300 is wound around the connection portion of the first tube 100 and the connecting rod 800, and the connection portion of the first tube 100 and the connecting rod 800 may be located in the first balloon 300. Wherein, the connecting rod 800 and the second section 202 of the second tube 200 are arranged in parallel, the first sealed end is connected with the outer tube wall of the first tube 100, and the second sealed end is connected with the outer wall of the second tube 200 and the connecting rod 800. Can be so that connecting rod 800 and first body 100 be located first sacculus 300 by the structure that forms of being connected, guaranteed the outward appearance uniformity of propelling movement portion, make the propelling movement portion have higher intensity, have better propelling movement nature.

As shown in fig. 6B, when the pushing part is provided with the connecting rod 800, the first balloon 300 may be further wound around the first tube 100 at a position close to the connecting rod, in which case the connection point of 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 extension guide catheter, including an operating portion, a pushing portion and a catheter 400 connected in sequence from a proximal end to a distal end; the catheter 400 is provided with a channel 410 which is penetrated along the axial direction and used for delivering 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 the first flow passage 110, and the second interface 700 is communicated 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 passage 110 is arranged in the first pipe body 100, and the second flow passage 210 is arranged in the second pipe body 200; one end of the first tube 100 close to the catheter 400 is provided with a first opening 120, the first opening 120 is located in the first balloon 300, and the second tube 100 passes through the first balloon 300 and then is connected to the second balloon 500. The extension guide catheter provided by the embodiment of the application can not only enhance the axial supporting force of the extension guide catheter when the first balloon 300 is pressurized, but also 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 affecting the operation. 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 guide catheter is further enhanced.

It should be noted that the extension guiding catheter of the second embodiment is substantially the same as that of the first embodiment, except that the structure of the pushing part of the second embodiment is different from that of the first embodiment, for example, the combination of the first tube 100 and the second tube 200 and the arrangement of the connecting rod 800 of the second embodiment are different from that of the first embodiment.

Referring to fig. 7B, fig. 8B, fig. 9B, fig. 7C, fig. 8C, and fig. 9C, in the present embodiment, the second tube 200 is disposed in parallel with the first tube 100, and the second tube 200 is disposed on a side facing away from the first circulation port 120 in a radial direction. Wherein, first body 100 and second body 200 all can set up to the straight form, and the two looks parallel arrangement has so both guaranteed the effective internal diameter of first body 100 and second body 200 for first sacculus 300 and second sacculus 500's stamping speed is faster, and the intensity that enables the propelling movement portion in addition is higher, has better propelling movement nature.

In this embodiment, the pushing portion may be provided with the connecting rod 800, or may not be provided with the connecting rod 800, referring to fig. 10A, 10B and 10C, when the pushing portion is provided with the connecting rod 800, in order to further enhance the strength of the pushing portion, the connecting rod 800 may be inserted into the first pipe body 100, and two ends of the connecting rod 800 are connected between the first connector 600 and the conduit 400, respectively.

In this embodiment, as shown in fig. 7B and 7C, when the pushing part is not provided with the connecting rod 800, the first sealed end of the first balloon 300 is connected to a portion of the outer tube wall of the first tube 100 and the second tube 200, and the second sealed end is connected to a portion of the inner tube wall of the first tube 100 and a portion of the outer tube wall of the second tube 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 of the first tube 100 and the connecting rod 800, and the connection portion of 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. Wherein, the connecting rod 800 sets up with the second section 202 of second body 200 looks abreast, and first sealed end links to each other with the outer pipe wall of the part of first body 100 and second body, and the second sealed end links to each other with the outer pipe wall of the part of second body 200 and connecting rod 800, can promote the joint strength of first sacculus 300 like this, can make the propelling movement portion have higher intensity in addition, has better propelling movement nature.

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

As shown in fig. 10B and 10C, in one implementation, when the pushing part is provided with the connecting rod 800, and two ends of the connecting rod 800 are connected to the first port 600 and the catheter 400, respectively, since a portion of the connecting rod 800 close to the proximal end is accommodated in the first tube 100, the first sealed 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 sealed 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 guiding catheter provided by the present application, by combining the first tube 100 and the second tube 200, the pushing portion can form the first flow channel 110 communicated with the first balloon 300 and the second flow channel 210 communicated with the second balloon 500, the two flow channels are independent from each other, and are used to control the contraction and expansion of the first balloon 300 and the second balloon 500 through media such as fluid, respectively, so that the axial supporting force of the extension guiding catheter 400 can be enhanced, the guide wire does not move, and the anchoring function is provided to the guiding catheter 400, so as to smoothly deliver instruments such as a micro-catheter, for example, the guide wire and the micro-catheter can be rapidly withdrawn, thereby avoiding the problems of blood vessel blockage or blood vessel injury, and facilitating the operation of a doctor in the operation of complex pathological changes such as CTO.

Having described embodiments of the present application, the above description is intended to be illustrative, 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 second pipe body comprises a first section and a second section which are connected into a whole;

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

the first section of the second pipe body is sleeved outside the first pipe body; or

The second tube and the first tube are arranged in parallel.

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

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

5. The elongate guiding catheter of claim 2, 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;

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

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

the first tube body is connected with the catheter, the first balloon is arranged adjacent to the instrument inlet, an inclined cut is formed in one side of the far end of the first tube body, penetrates out of the second tube body in 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;

7. The elongate guiding catheter of claim 5, 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 close to the second pipe body, wherein part of the inclined cut is used for forming the first circulation port; or

8. The elongate guiding catheter of claim 1 or 5, wherein:

the first balloon comprises a first sealing end and a second sealing end, the first sealing end is arranged towards the near end, the second sealing end is arranged towards the far end, the first sealing end is connected with the tube wall of the first tube body and/or the second tube body in a sealing mode, and the second sealing end is connected with the tube wall of the first tube body and/or the second tube body in a sealing mode.

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

the first balloon comprises a first sealing end and a second sealing end, the first sealing end is arranged towards the near end, the second sealing end is arranged towards the far end, the first sealing end is connected with the tube wall of the first tube body and/or the second tube body in a sealing mode, and the second sealing end is connected with the connecting rod and/or the tube wall of the second tube body in a sealing mode.

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

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

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

the developing part is fixed to the first pipe body, or the developing part in the first balloon is fixed to the second pipe body and/or the connecting rod, and the developing part in the second balloon is fixed to the catheter.

12. 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