Extended guiding catheter

Abstract

The invention relates to an extended guide catheter. The extension guiding catheter comprises an operation interface, a pushing part and a catheter which are sequentially connected from the near end to the far end. The catheter is provided with a channel which is through in the axial direction and used for conveying instruments, an inclined instrument inlet is formed in the side, facing the near end, of the catheter, and the opening direction of the instrument inlet faces the near end. A balloon is arranged on the periphery of the catheter in a surrounding mode and is in fluid communication with the operation connector. Wherein the pushing part is provided with a connecting part used for connecting the operation connector with the catheter and a flow channel used for communicating the operation connector with the balloon in a fluid mode, and at least part of the connecting part is embedded in the flow channel. According to the scheme, the maximum radial size of the pushing part is reduced, and conveying of instruments such as guide wires and micro-catheters is better facilitated.

Description

[0001] This application is a divisional application of a patent application with an application date of December 10, 2021, application number 202111507174.3, and invention name “Extended Guide Catheter”. Technical Field

[0002] The present application relates to the technical field of medical devices, and in particular to an extended guide catheter. Background Art

[0003] Percutaneous coronary intervention (PCI) is a treatment method that uses cardiac catheterization to clear narrow or even blocked coronary artery cavities, thereby improving myocardial blood perfusion. This surgery has the advantages of short treatment course, less trauma, and significant efficacy, and has developed rapidly in recent years.

[0004] An extended guide catheter is a medical device used in percutaneous coronary intervention (PCI). Its main function is to increase support and assist in device delivery. The extended guide catheter was developed in response to the need to increase the recoil support of the guide catheter, improve its stability at the coronary artery opening, and achieve non-invasive deep insertion to deliver the device to the distal lesion during PCI surgery. It is usually used in conjunction with a guide catheter and plays a key supporting and auxiliary role in interventional surgery. An extended guide catheter usually consists of two sections: a push rod and an extension tube. The push rod part is used to provide sufficient pushing force and anti-bending properties to ensure that the catheter can reach the lesion site smoothly. The extension tube part is used to provide additional support and is compatible with guide catheters of various sizes. Its rapid exchange function enables doctors to quickly replace other interventional devices during surgery to improve surgical efficiency.

[0005] PTCA (Percutaneous Transluminal Coronary Angioplasty) is an interventional surgical method used to treat coronary artery stenosis. The PTCA balloon catheter is a medical device used to treat coronary artery stenosis and blockage. During the operation, the doctor inserts the PTCA balloon catheter into the body through the vascular insertion point and guides it to the site of coronary artery stenosis or blockage. Then, the balloon is inflated to expand the blood vessel, thereby changing the shape of the blood vessel to achieve the purpose of treatment.

[0006] The extended guide catheter and the PTCA balloon catheter are two different medical devices, and there are significant differences between the two in terms of usage methods, functions and structures. The main function of the extended guide catheter is to increase support and assist in the delivery of equipment. In percutaneous coronary intervention surgery, related technologies such as guidewires, microcatheters, and PTCA balloon catheters are pushed from the extended guide catheter to the desired position in the coronary artery. For example, the PTCA balloon catheter can be pushed from the extended guide catheter to the site of coronary artery stenosis or blockage to achieve treatment of the stenotic or blocked site.

[0007] Specifically, Japanese patent application with publication number JP2003164528A relates to a balloon catheter, which is the above-mentioned PTCA balloon catheter, and paragraph

[0002] of its specification states "an occluded part or stenosis of a tube engaged by a balloon catheter at a treatment location". The balloon catheter is used in conjunction with a guide wire, which is first introduced into a blood vessel and reaches the lesion site along the blood vessel. Then, the balloon catheter is sent into the blood vessel along the guide wire and reaches the lesion site under the guidance of the guide wire.

[0008] However, the balloon catheter with publication number JP2003164528A is mainly used for targeted treatment of diseased blood vessels of patients. Since the opening direction of the guidewire port of the balloon catheter is perpendicular to the axial direction of the distal shaft and the radial dimension of the inner cavity is small, the inner cavity can only allow the guidewire to pass through, and the catheter cannot provide axial support and coaxial calibration, making it difficult to deliver other microcatheters, stents and other instruments in the distal shaft except the guidewire. Therefore, the balloon catheter cannot be used as an extended guide catheter in interventional treatment surgery. Summary of the invention

[0009] In order to solve or partially solve the problems existing in the related art, the present application provides an extended guide catheter, which can reduce the maximum radial dimension of the push portion and is more conducive to the delivery of instruments such as guidewires and microcatheters.

[0010] The first aspect of the present application provides an extended guide catheter, comprising:

[0011] An operation interface, a pushing part and a catheter are connected in sequence from the proximal end to the distal end;

[0012] Wherein, the catheter is provided with a channel penetrating along the axial direction for conveying the instrument;

[0013] A balloon is disposed around the outer periphery of the catheter, and the balloon is fluidically connected to the operation interface;

[0014] The pushing portion is provided with a connecting component for connecting the operation interface with the catheter, and a flow channel for fluidically connecting the operation interface with the balloon, and at least part of the connecting component is embedded in the flow channel.

[0015] In one implementation, the connecting component includes a first tube body;

[0016] The flow channel is formed by the first tube body and a second tube body connected to the first tube body;

[0017] Wherein, at least a portion of the first tube is embedded in the second tube.

[0018] In one implementation manner, the first tube body includes an inserting portion inserted into the second tube body, and the inserting portion is provided with a flow port fluidically connected to the second tube body.

[0019] In one implementation, the connecting component includes a first tube body and a connecting rod connected in the axial direction;

[0020] The flow channel is formed by the first tube body and a second tube body connected to the first tube body;

[0021] Wherein, at least a portion of the first tube body and at least a portion of the connecting rod are embedded in the second tube body.

[0022] In one implementation, the first tube body includes an inserting portion inserted into the second tube body;

[0023] The first tube body is connected to the connecting rod through the plug-in portion, and the plug-in portion is provided with a flow port which is fluidically connected to the second tube body.

[0024] In one implementation, the plug-in portion is provided with an inclined cutout, the connecting rod is inserted into the inclined cutout, and is fixedly connected to the inner wall surface at the inclined cutout;

[0025] Part of the inclined cutouts is used to form the flow openings.

[0026] In one implementation, the connecting rod is fixedly connected to the axial end of the plug-in portion and is used to block the opening of the axial end;

[0027] Wherein, the flow opening is opened on the tube wall of the plug-in part.

[0028] In one implementation manner, the inserting portion is sealed and inserted into the second tube body from the axial opening of the second tube body.

[0029] In one implementation, the connecting component includes a connecting rod connected between the operation interface and the catheter, and the flow channel is formed by a second tube body connected between the operation interface and the catheter;

[0030] Wherein, at least a portion of the connecting rod is embedded in the second tube body.

[0031] In one implementation, the second tube body includes a first sub-tube body and a second sub-tube body formed as one body;

[0032] The first sub-tube body is arranged on the pushing part, and the second sub-tube body is arranged on the catheter;

[0033] Wherein, at least a portion of the connecting rod is embedded in the first sub-tube body.

[0034] In one implementation manner, the material of the first tube includes metal.

[0035] In one implementation manner, the connecting rod is a solid structure.

[0036] In one implementation, the catheter is a composite structure consisting of an outer layer, a middle layer and an inner layer;

[0037] The hardness of the catheter gradually decreases along the direction from the proximal end to the distal end.

[0038] The technical solution provided by this application may have the following beneficial effects:

[0039] The extended guide catheter of the embodiment of the present application includes an operation interface, a push part and a catheter connected in sequence from the proximal end to the distal end; wherein the catheter is provided with a channel for conveying instruments that runs axially; a balloon is provided around the outer periphery of the catheter, and the balloon is fluidically connected to the operation interface; wherein the push part is provided with a connecting component for connecting the operation interface to the catheter, and a flow channel for fluidically connecting the operation interface to the balloon, and at least part of the connecting component is embedded in the flow channel. The extended guide catheter provided in the embodiment of the present application enables the push part to form an inner-outer nested structure, effectively reducing the maximum radial dimension of the push part, and is more conducive to the delivery of instruments such as guidewires and microcatheters.

[0040] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The above and other objects, features and advantages of the present application will become more apparent by describing in more detail exemplary embodiments of the present application in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the present application.

[0042] Figure 1 is a schematic structural diagram of an extended guide catheter shown in the first embodiment of the present application;

[0043] Figure 2A yes Figure 1The local enlarged schematic diagram of point Ⅰ in the middle;

[0044] Figure 2B yes Figure 1 Sectional view along AA;

[0045] Figure 2C yes Figure 1 Sectional view along the middle line BB;

[0046] Figure 2D yes Figure 1 Cross-sectional view at the middle edge CC;

[0047] Figure 2E yes Figure 1 Sectional view at the middle edge DD;

[0048] Figure 3 is a schematic structural diagram of an extended guide catheter shown in the second embodiment of the present application;

[0049] Figure 4A yes Figure 3 A partial enlarged schematic diagram of the middle II;

[0050] Figure 4B yes Figure 3 Cross-sectional view along EE.

[0051] Figure 5 is a schematic structural diagram of an extended guide catheter shown in the third embodiment of the present application;

[0052] Figure 6 is a schematic structural diagram of an extended guide catheter shown in the fourth embodiment of the present application;

[0053] Fig. 7A yes Figure 6 Cross-sectional view at the middle edge FF;

[0054] Figure 7B yes Figure 6 A partial enlarged schematic diagram of point III in the middle.

[0055] Figure numerals: 100, catheter; 200, first sub-tube body; 300, second sub-tube body; 400, first tube body; 500, connecting rod; 600, operation interface; 110, channel; 101 outer layer; 102, middle layer; 103, inner layer; 120, instrument entrance; 130, developing tip; 140, balloon; 141, expansion cavity; 210, flow channel; 410, flow port; 420, port; 430, plug interface. DETAILED DESCRIPTION

[0056] The embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0057] It should be understood that although the terms "first", "second", "third", etc. may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of this application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0058] In the description of the present application, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0059] Unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, or a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0060] In the related art, during percutaneous coronary intervention surgery, guidewires, microcatheters and other instruments are pushed from an extended guide catheter to a desired position in the coronary artery. However, since the radial dimension of the pushing portion of the extended guide catheter in the related art is too large, it is not conducive to the delivery of guidewires, microcatheters and other instruments, thereby increasing the difficulty of the surgery.

[0061] In view of the above problems, an embodiment of the present application provides an extended guide catheter, which can reduce the maximum radial dimension of the pushing portion and is more conducive to the delivery of instruments such as guidewires and microcatheters.

[0062] The technical solution of the embodiments of the present application is described in detail below with reference to the accompanying drawings.

[0063] Embodiment 1

[0064] Figure 1 It is a schematic structural diagram of the extended guide catheter shown in the first embodiment of the present application.

[0065] See also Figure 1 The extended guide catheter provided in this embodiment includes: an operation interface 600, a pushing part and a catheter 100 connected in sequence from the proximal end to the distal end; wherein the catheter 100 is provided with a channel 110 for conveying instruments that runs axially through; a balloon 140 is provided around the outer periphery of the catheter 100, and the balloon 140 is fluidically connected to the operation interface 600; wherein the pushing part is provided with a connecting component for connecting the operation interface 600 to the catheter 100, and includes a flow channel 210 for fluidically connecting the operation interface 600 to the balloon 140, and at least part of the connecting component is embedded in the flow channel 210.

[0066] The extended guide catheter in the embodiment of the present application has a proximal end which is an end for a doctor to operate, and a distal end which is an end away from the doctor to operate.

[0067] The extended guide catheter provided in the embodiment of the present application enables the push portion to form an inner and outer nested structure, effectively reducing the maximum radial dimension of the push portion, which is more conducive to the delivery of instruments such as guide wires and microcatheters. In addition, the structure of the flow channel of the push portion is optimized, and the passing capacity of the medium in the flow channel 210 is enhanced, thereby enabling rapid inflation or depressurization of the balloon 140.

[0068] Figure 2E yes Figure 1 Cross-sectional view along the middle line DD.

[0069] See also Figure 1 and Figure 2E In this embodiment, the catheter 100 is provided with an inclined instrument entrance 120 at the proximal side and a developing tip 130 at the distal side. The catheter 100 is a composite structure consisting of an outer layer 101, an intermediate layer 102 and an inner layer 103; the outer layer 101 of the catheter 100 is made of a material with a relatively high hardness, which not only provides a better support for the balloon 140, but also prevents the catheter 100 from deforming when the balloon 140 is pressurized.

[0070] The hardness of the catheter 100 gradually decreases from the proximal end to the distal end, which not only avoids deformation but also makes it easier to pass through tortuous lesions.

[0071] In one implementation, the middle layer 102 may be composed of a metal spring and a braided layer; the material of the inner layer 103 may include materials such as HDPE (High Density Polyethylene) or PTFE (Poly tetrafluoroethylene).

[0072] In one implementation, the middle layer 102 may also be composed of a separately provided metal spring, or a separately provided braided layer.

[0073] It can be understood that the middle layer 102 is not limited to being composed of metal springs and braided layers, nor is it limited to being composed of separately arranged metal springs, or is not limited to being composed of separately arranged braided layers. The present application does not limit the structure of the middle layer 102. For example, in other embodiments, the middle layer 102 can also be composed of a hollowed-out tube through rotary cutting.

[0074] In one implementation, the balloon 140 includes an expandable or contractible expansion body, which is disposed on the periphery of the catheter 100 and defines an expansion cavity 141 together with the outer wall of the catheter 100 . The expansion cavity 141 is fluidically connected to the operation interface 600 through the flow channel 210 .

[0075] In one implementation, the diameter of the balloon 140 may be 1.5-4.5 mm, but is not limited thereto.

[0076] In one implementation, the operation interface 600 may be a HUB interface, which is used to connect to an external device, and then pressurize or depressurize the balloon 140 through the flow channel 210. During pressurization, a medium such as a fluid can be input from the operation interface 600 and injected into the expansion cavity 141 of the balloon 140 through the flow channel 210, so that the expansion body of the balloon 140 expands. After the expansion body expands, the catheter 100 can be anchored at a desired position in the blood vessel, so as to provide a stronger axial support force for the extended guide catheter. In this way, the defect of the extended guide catheter in the related art that the reverse movement occurs in the blood vessel due to insufficient axial support force or heart beating can be avoided, and the guide wire, microcatheter and other instruments can be smoothly transported in the extended guide catheter.

[0077] Figure 2E yes Figure 1 Cross-sectional view along the middle line DD.

[0078] See also Figure 1 and Figure 2E In one implementation, the connecting component includes a first tube body 400 and a connecting rod 500 connected along the axial direction; the flow channel 210 is formed by the first tube body 400 and a second tube body connected to the first tube body 400; wherein at least part of the first tube body 400 and at least part of the connecting rod 500 are embedded in the second tube body.

[0079] The second tube body includes a first sub-tube body 200 and a second sub-tube body 300 formed as one body; the first sub-tube body 200 is arranged on the pushing part, and the second sub-tube body 300 is arranged on the catheter 100; at least part of the connecting rod 500 is embedded in the first sub-tube body 200.

[0080] In this embodiment, the second sub-tube 300 is arranged outside the catheter 100, and the inner diameter of the second sub-tube 300 can be smaller than that of the first sub-tube 200, so that the radial maximum dimension of the second sub-tube 300 and the catheter 100 after being arranged side by side can be reduced, thereby enabling the extended guiding catheter 100 to be smoothly advanced into the blood vessel. At the same time, it is also convenient to embed at least part of the connecting rod 500 in the first sub-tube 200.

[0081] In this embodiment, the inner diameter of the first sub-tube 200 is set to be larger than that of the second sub-tube 300. This allows the connecting rod 500 to be embedded on the one hand, and on the other hand, it ensures that a flow channel 210 is formed between the connecting rod 500 for the medium to pass quickly, thereby increasing the inflation or decompression speed of the balloon 140.

[0082] It should be noted that, in this embodiment, the first sub-tube body 200 and the second sub-tube body 300 can be formed as one body. For example, part of the tube wall of the first sub-tube body 200 and the second sub-tube body 300 can be formed as one body, or the first sub-tube body 200 extends from the proximal end to the distal end and its inner diameter gradually decreases to form the second sub-tube body 300. After being formed as one body, the structural strength of the push part can be improved and the process can be simplified.

[0083] In one implementation, the second tube body can be made of a material with greater hardness, such as nylon or PEBAX (polyether block polyamide). This ensures that no significant deformation will occur when high pressure exists in the flow channel 210, thereby ensuring the passing capacity of the medium and not affecting the delivery of the device.

[0084] In this embodiment, the connecting rod 500 may be a solid structure, or one end of the connecting rod 500 connected to the second tube body may be a partially solid structure.

[0085] In one implementation, the connecting rod 500 may be made of metal, such as but not limited to 304 or 316 stainless steel.

[0086] Figure 2A yes Figure 1 The local enlarged schematic diagram of point Ⅰ in the middle; Figure 2B yes Figure 1 Cross-sectional view along AA.

[0087] See also Figure 1 , Figure 2A and Figure 2BIn this embodiment, the first tube body 400 includes a plug-in portion plugged into the second tube body; the first tube body 400 is connected to the connecting rod 500 through the plug-in portion, and the plug-in portion is provided with a flow port 410 in fluid communication with the second tube body. After such a configuration, the first tube body 400 is fixedly connected to the connecting rod 500 inside the second tube body, and the push part realizes an inside-outside nested structure, which can reduce the radial dimension of the push part and is more conducive to the delivery of other instruments.

[0088] Continue to see Figure 2A The plug-in portion is sealed and plugged into the second tube body from the axial opening of the second tube body, wherein a plug-in port 430 is provided on the proximal side of the second tube body, and the plug-in portion is plugged into the second tube body from the plug-in port 430, and the edge of the plug-in port 430 is sealed and connected to the outer tube wall of the first tube body, so that the proximal side of the second tube body is in a sealed state, thereby preventing the medium in the flow channel 210 from leaking.

[0089] In one implementation, the edge of the insertion port 430 on the side of the second tube body facing the proximal end can be welded to the outer tube wall of the first tube body 400, so that the connection between the first tube body 400 and the second tube body is more secure.

[0090] In this embodiment, the connecting rod 500 is fixedly connected to the axial end of the plug-in part and is used to block the opening of the axial end; wherein, a flow opening is provided on the tube wall of the plug-in part. The radial dimension of the end of the proximal side of the connecting rod 500 can be matched with the cross-sectional setting of the port 420 of the first tube body 400, so that the end of the proximal side of the connecting rod 500 can just block the port 420. In addition, the connecting rod 500 and the first tube body 400 form mutual support along the axial direction, thereby improving the structural stability of the push part.

[0091] Continue to see Figure 1 and Figure 2B The proximal end of the connecting rod 500 is fixedly connected to the first tube body 400 , and the distal end thereof extends to the catheter 100 after passing through the tube wall of the second tube body, and is fixedly connected to the tube wall of the catheter 100 .

[0092] In one implementation, the material of the first tube body 400 includes metal, for example, a hypotube can be used. Alternatively, the material of the first tube body 400 can include nickel-titanium alloy or stainless steel. In this way, the first tube body 400 has a higher hardness and good anti-kink performance. Compared with the extended guiding catheter in the related art, the extended guiding catheter in this embodiment has better pushability under the same size.

[0093] Embodiment 2

[0094] Figure 3 It is a schematic structural diagram of an extended guide catheter shown in the second embodiment of the present application.

[0095] See also Figure 3 The extended guide catheter of the embodiment of the present application includes an operation interface 600, a pushing portion and a catheter 100 connected in sequence from the proximal end to the distal end; wherein the catheter 100 is provided with a channel 110 for conveying instruments that runs axially through; a balloon 140 is provided around the outer periphery of the catheter 100, and the balloon 140 is fluidically connected to the operation interface 600; wherein the pushing portion is provided with a connecting component for connecting the operation interface 600 to the catheter 100, and includes a flow channel 210 for fluidically connecting the operation interface 600 to the balloon 140, and at least part of the connecting component is embedded in the flow channel 210.

[0096] The extended guiding catheter provided in the embodiment of the present application has a push portion formed with an inner and outer nested structure, which effectively reduces the maximum radial dimension of the push portion and is more conducive to the delivery of guidewires, microcatheters and other instruments. In addition, the medium passing capacity in the flow channel 210 is enhanced, and the balloon 140 can be quickly pressurized or depressurized.

[0097] It is worth noting that the extended guide catheter provided in the second embodiment is basically the same as that in the first embodiment, except that the connection method between the first tube body 400 and the connecting rod 500 and the structure of the flow port 410 in the second embodiment are different from those in the first embodiment.

[0098] Figure 4A yes Figure 3 A partial enlarged schematic diagram of the middle II; Figure 4B yes Figure 3 Cross-sectional view along EE.

[0099] See also Figure 3 , Figure 4A and Figure 4B In this embodiment, the plug-in portion is provided with an inclined cutout, the connecting rod 500 is inserted into the inclined cutout, and is fixedly connected to the inner wall surface at the inclined cutout; wherein, part of the inclined cutout is used to form the flow port 410.

[0100] In one implementation, the axial angle between the inclined cutout and the pushing portion may be 0-90 degrees.

[0101] In this embodiment, the diameter of the connecting rod 500 can be smaller than the inner diameter of the first tube body 400. After the connecting rod 500 is inserted into the inclined cut, it only occupies part of the space of the inclined cut, and the medium in the first tube body 400 can be output to the second tube body from the remaining space of the inclined cut.

[0102] In addition, after the connecting rod 500 is inserted into the inclined incision, the outer wall surface of the connecting rod 500 and the inner wall surface of the first tube body 400 are fixedly connected, for example, they can be fixedly connected by welding, which can increase the connection area between the connecting rod 500 and the first tube body 400, thereby improving the connection strength between the connecting rod 500 and the first tube body 400.

[0103] Embodiment 3

[0104] Figure 5 It is a schematic diagram of the structure of an extended guide catheter shown in the third embodiment of the present application.

[0105] See also Figure 5 The extended guide catheter of the embodiment of the present application includes an operation interface 600, a pushing portion and a catheter 100 connected in sequence from the proximal end to the distal end; wherein the catheter 100 is provided with a channel 110 for conveying instruments that runs axially through; a balloon 140 is provided around the outer periphery of the catheter 100, and the balloon 140 is fluidically connected to the operation interface 600; wherein the pushing portion is provided with a connecting component for connecting the operation interface 600 to the catheter 100, and includes a flow channel 210 for fluidically connecting the operation interface 600 to the balloon 140, and at least part of the connecting component is embedded in the flow channel 210.

[0106] The extended guide catheter provided in the embodiment of the present application enables the push portion to form an inner-outer nested structure, effectively reducing the maximum radial dimension of the push portion, and is more conducive to the delivery of instruments such as guidewires and microcatheters.

[0107] It is worth noting that the extended guide catheter of the third embodiment is basically the same as that of the first and second embodiments, except that the structure of the pushing portion of the third embodiment is different from that of the first and second embodiments.

[0108] The pushing portion of this embodiment may not be provided with the first tube body 400 , but includes a connecting rod 500 . The second tube body and the connecting rod 500 are connected to the operation interface 600 and between the catheter 100 .

[0109] In this embodiment, a part of the flow channel 210 of the pushing portion is formed between the second tube body and the connecting rod 500. Since the first tube body 400 is not provided, the structure of the pushing portion can be simplified.

[0110] Embodiment 4

[0111] Figure 6 It is a schematic structural diagram of an extended guide catheter shown in the fourth embodiment of the present application.

[0112] See also Figure 6The extended guide catheter of the embodiment of the present application includes an operation interface 600, a pushing portion and a catheter 100 connected in sequence from the proximal end to the distal end; wherein the catheter 100 is provided with a channel 110 for conveying instruments that runs axially through; a balloon 140 is provided around the outer periphery of the catheter 100, and the balloon 140 is fluidically connected to the operation interface 600; wherein the pushing portion is provided with a connecting component for connecting the operation interface 600 to the catheter 100, and includes a flow channel 210 for fluidically connecting the operation interface 600 to the balloon 140, and at least part of the connecting component is embedded in the flow channel 210.

[0113] The extended guide catheter provided in the embodiment of the present application enables the push portion to form an inner-outer nested structure, effectively reducing the maximum radial dimension of the push portion, and is more conducive to the delivery of instruments such as guidewires and microcatheters.

[0114] It is worth noting that the extended guide catheter of the fourth embodiment is basically the same as that of the first to third embodiments, except that the structure of the pushing portion of the fourth embodiment is different from that of the first to third embodiments.

[0115] The pushing portion of this embodiment may not be provided with the connecting rod 500 , but includes a first tube body 400 . The first tube body 400 is connected to the operation interface 600 and between the catheter 100 .

[0116] Fig. 7A yes Figure 6 Cross-sectional view at the middle edge FF, Figure 7B yes Figure 6 A partial enlarged schematic diagram of point III in the middle.

[0117] See also Figure 6 , Fig. 7A and Figure 7B In this embodiment, the connecting component includes a first tube body 400; the flow channel is formed by the first tube body 400 and a second tube body connected to the first tube body 400; wherein, at least a portion of the first tube body 400 is embedded in the second tube body, which can not only simplify the structure of the pushing part, but also reduce the radial size of the pushing part.

[0118] In one implementation, the first tube body 400 includes a plug-in portion plugged into the second tube body, and the plug-in portion is provided with a flow port in fluid communication with the second tube body. The end of the plug-in portion passes through the tube wall of the second tube body and is connected to the catheter 100, for example, passes through the tube wall of the first sub-tube body 200 of the second tube body and is connected to the catheter 100.

[0119] In this embodiment, the plug-in portion is provided with an inclined cutout, and the inclined cutout is used to form a flow port 410. Such a structure can not only expand the size of the flow port, but also improve the fluid passing capacity. The material of the first tube body 400 includes metal, for example, a hypotube can be used. Alternatively, the material of the first tube body 400 may include nickel-titanium alloy or stainless steel. In this way, the first tube body 400 has a higher hardness, which not only makes the connection stability between the operation interface and the catheter 100 better, but also has good anti-kink performance, which can improve the pushability of the extended guide catheter.

[0120] It can be understood that the pushing portion of this embodiment is not limited to the structures in the above embodiments 1 to 4, and the above are only exemplary descriptions.

[0121] The scheme of the present application has been described in detail above with reference to the accompanying drawings. In the above embodiments, the descriptions of the various embodiments have their own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments. Those skilled in the art should also be aware that the actions and modules involved in the specification are not necessarily required for the present application. In addition, it can be understood that the steps in the method of the embodiment of the present application can be adjusted in order, merged and deleted according to actual needs, and the modules in the device of the embodiment of the present application can be merged, divided and deleted according to actual needs.

[0122] The embodiments of the present application have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. An extended guide catheter, characterized in that: include: An operation interface, a pushing part and a catheter are connected in sequence from the proximal end to the distal end; The catheter is provided with a channel for conveying instruments which runs through the catheter in the axial direction, and an inclined instrument inlet is provided on the proximal side of the catheter, and the opening direction of the instrument inlet faces the proximal end; A balloon is disposed around the outer periphery of the catheter, and the balloon is fluidically connected to the operation interface; The pushing portion is provided with a connecting component for connecting the operation interface with the catheter, and a flow channel for fluidically connecting the operation interface with the balloon, and at least part of the connecting component is embedded in the flow channel.

2. The extended guide catheter according to claim 1, characterized in that: The connecting component includes a first tube body; The flow channel is formed by the first tube body and a second tube body connected to the first tube body; Wherein, at least a portion of the first tube is embedded in the second tube.

3. The extended guide catheter according to claim 2, characterized in that: The first tube body includes an inserting portion inserted into the second tube body, the inserting portion is provided with a flow port fluidically connected to the second tube body, and the first tube body is fixedly connected to the connecting rod inside the second tube body.

4. The extended guide catheter according to claim 2, characterized in that: An insertion port is provided on the proximal side of the second tube body, the plug-in portion is inserted into the second tube body from the insertion port, and the edge of the insertion port is sealed and connected to the outer tube wall of the first tube body; the edge of the insertion port on the side of the second tube body facing the proximal end is welded to the outer tube wall of the first tube body.

5. The extended guide catheter according to claim 2, characterized in that: The connecting component includes a connecting rod connected between the operation interface and the catheter, the flow channel is formed by a second tube body connected between the operation interface and the catheter, and the second tube body and the connecting rod are commonly connected between the operation interface and the catheter; Wherein, at least a portion of the connecting rod is embedded in the second tube body.

6. The extended guide catheter according to claim 5, characterized in that: A portion of the flow channel of the pushing portion is formed between the second tube body and the connecting rod.

7. The extended guide catheter according to claim 5, characterized in that: The second tube body comprises a first sub-tube body and a second sub-tube body formed as one body, wherein the first sub-tube body and the second sub-tube body are formed as one body; or, the first sub-tube body extends from the proximal end to the distal end and the inner diameter of the first sub-tube body gradually decreases to form the second sub-tube body; The first sub-tube body is arranged on the pushing part, and the second sub-tube body is arranged on the catheter; Wherein, at least a portion of the connecting rod is embedded in the first sub-tube body.

8. The extended guide catheter according to claim 2, characterized in that: The material of the first tube includes metal; The second tube is made of nylon or PEBAX.

9. The extendable guide catheter according to claim 1, characterized in that: The conduit is a composite structure consisting of an outer layer, an intermediate layer and an inner layer; The hardness of the catheter gradually decreases along the direction from the proximal end to the distal end; The middle layer is composed of metal springs and / or braided layers; or, the middle layer is composed of a hollowed-out tube through rotary cutting.

10. The extendable guide catheter according to claim 1, characterized in that: The diameter of the balloon 140 is 1.5-4.5 mm.

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