Extending catheter and medical instrument

Abstract

The extension catheter comprises a catheter body (1), a push rod (2) and a balloon (3), an extension channel (11) is arranged in the catheter body (1), a leading-in opening (12) is formed in the near end of the catheter body (1), the push rod (2) is connected to the near end of the catheter body (1), a filling channel (21) is arranged in the push rod (2), the balloon (3) is arranged on the outer side of the near end of the catheter body (1), and the balloon (3) is communicated with the filling channel (21). The medical instrument comprises a guiding catheter (6) and an extension catheter, a guiding channel (61) is arranged in the guiding catheter (6), the near end of the catheter body (1) extends into the far end in the guiding channel (61), and the balloon (3) abuts against the inner wall of the guiding channel (61) after being expanded. The extended catheter is not easy to slide and slip in the guide catheter (6), a contrast agent / medicine can flow to the extended channel along the guide channel (61) to carry out super-selective contrast / medicine application, and the extended catheter can be externally connected with an aspirator to realize thrombus and plaque aspiration functions.

Description

Extension catheters and medical devices

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 202223593958.5, filed on December 29, 2022, entitled “Extension Catheter and Medical Device,” which is incorporated herein by reference in its entirety. Technical Field

[0003] The present application belongs to the field of medical devices, and specifically relates to an extension catheter and a medical device. Background Art

[0004] Percutaneous transluminal coronary intervention (PCI) involves the use of percutaneous puncture to deliver a balloon catheter or other device to relieve coronary artery stenosis or obstruction and restore coronary blood flow. With the continuous advancement of medicine, interventional procedures have also seen significant growth. However, during the placement of extension catheters in related technologies, gaps in the guide catheter lumen can lead to slippage or even dislocation.

[0005] Summary of the Invention

[0006] The purpose of the embodiments of the present application is to provide an extension catheter and a medical device to solve the technical problem in the prior art that the extension catheter is prone to slipping or even falling off inside the guide catheter.

[0007] To achieve the above-mentioned purpose, the technical solution adopted in this application is: an extension catheter, comprising:

[0008] a tube body, wherein an extension channel for conveying medical devices is provided inside the tube body, and an introduction port is provided at the proximal end of the tube body;

[0009] A push rod is connected to the proximal end of the tube body to form an overlapping portion, and a filling channel is provided inside the push rod;

[0010] The balloon is provided on the tube body and is located at the proximal end of the tube body, and the inner cavity of the balloon is communicated with the filling channel.

[0011] In one embodiment, the tube body includes an inner layer, a reinforcement layer, and an outer layer arranged in sequence from the inside to the outside, and the extension channel is located in the inner layer.

[0012] In one embodiment, the extension catheter further includes a connecting piece, which connects the reinforcement layer and the pushing rod.

[0013] In one embodiment, the reinforcement layer comprises a stainless steel braided mesh or springs.

[0014] In one embodiment, the inner layer is made of polytetrafluoroethylene or linear low-density polyethylene.

[0015] In one embodiment, the outer layer is made of a material comprising one or more mixtures of polyether front-end polyamide, nylon, and polyurethane elastomer.

[0016] In one embodiment, the hardness of the material of the outer layer decreases from the proximal end to the distal end of the catheter.

[0017] In one embodiment, the balloon is made of silicone rubber, polyurethane elastomer, or thermoplastic elastomer.

[0018] In one embodiment, the radial cross-sectional structure of the push rod can be elliptical, circular, or semi-arc.

[0019] In one embodiment, the pushing rod is made of a hypotube.

[0020] In one embodiment, the connecting member includes a connecting plate and a plurality of connecting strips connected to opposite sides of the connecting plate, the connecting plate and each connecting strip are connected to the reinforcing layer, the pushing rod is connected to the connecting plate, and each connecting strip is wrapped and connected to the inner layer.

[0021] In one embodiment, the distal end of the push rod is provided with a first through hole connected to the filling channel, and the outer layer is provided with a second through hole corresponding to the position of the first through hole, and the filling channel is connected to the inner cavity of the balloon through the first through hole and the second through hole.

[0022] In one embodiment, the introduction port is arranged to be oblique.

[0023] In one embodiment, the extension catheter further comprises a catheter seat connected to the proximal end of the pushing rod, and a third through hole communicating with the filling channel is provided in the catheter seat.

[0024] In one embodiment, a first developing ring is provided at the distal end of the tube body, and a second developing ring is provided at the proximal end of the tube body, and the second developing ring is located inside the balloon.

[0025] In one embodiment, the balloon is flatly attached to the tube body, the distal end of the balloon is tightly welded to the outer layer to form a sealed end, and the proximal end of the balloon is tightly welded to the outer layer and the distal end of the push rod.

[0026] Another object of the present application is to provide a medical device comprising:

[0027] a guiding catheter, wherein a guiding channel is provided in the guiding catheter;

[0028] The proximal end of the extension catheter extends into the guiding channel, and the balloon abuts against the inner wall of the guiding channel after expansion.

[0029] In one embodiment, the medical device further includes an aspirator, which is connected to the proximal end of the guiding catheter and communicates with the guiding channel, and is used to aspirate thrombus.

[0030] The beneficial effect of the extension catheter provided by the embodiment of the present application is that: compared with the prior art, the extension catheter of the embodiment of the present application is provided with a balloon at the proximal end of the tube body, and a filling channel connected to the balloon is provided in the push rod. The extension catheter is extended along the proximal end of the guide catheter, one end of the push rod is exposed from the proximal end of the guide catheter, and the distal end of the tube body is exposed from the distal end of the guide catheter. The proximal end of the tube body is located at the distal end of the guide catheter, and the balloon can be filled through the filling channel. After the balloon is expanded, the outer wall of the balloon is tightly attached to the inner cavity of the guide catheter, and the extension catheter is not easy to slip or slip off in the guide catheter, which can enhance the axial stability of the extension catheter in the guide catheter.

[0031] The beneficial effects of the medical device provided by the embodiment of the present application are as follows: compared with the prior art, the medical device of the embodiment of the present application uses the above-mentioned extension catheter, and the proximal end of the tube body is located at the distal end of the guiding catheter. After the balloon is expanded, the outer wall of the balloon is close to the inner lumen of the guiding catheter, and the inner lumen of the guiding catheter is completely closed. The contrast agent / drug is injected from the proximal end of the guiding catheter, and the contrast agent / drug will flow along the guiding channel and enter the extension channel through the introduction port for super-selective angiography (by injecting contrast agent, thereby showing the lesions of the coronary artery) / medication. The extension channel is connected to the guiding channel, and the proximal end of the guiding catheter can be externally connected to an aspirator. The aspirator is used to connect the extension channel and the guiding channel to aspirate thrombus and plaque, which can avoid the inconvenience caused by frequent replacement of interventional catheters during surgery, shorten the operation time, reduce the difficulty of surgery, and reduce the patient's pain. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0033] FIG1 is a schematic structural diagram of an extension catheter provided in an embodiment of the present application;

[0034] FIG2 is a schematic structural diagram of the connection between the push rod and the tube body of the extension catheter provided in an embodiment of the present application;

[0035] FIG3 is a cross-sectional view of a tube body of an extension catheter provided in an embodiment of the present application;

[0036] FIG4 is a cross-sectional view of a push rod of an extension catheter provided in an embodiment of the present application;

[0037] FIG5 is a schematic structural diagram of a connector for an extension catheter provided in an embodiment of the present application;

[0038] FIG6 is a schematic structural diagram of the connection between the tube body and the guide catheter of the medical device provided in an embodiment of the present application.

[0039] Figure numerals: 1. Tube body; 11. Extension channel; 12. Introduction port; 13. Inner layer; 14. Reinforcement layer; 15. Outer layer; 151. First developing ring; 152. Second developing ring; 2. Push rod; 21. Filling channel; 22. First through hole; 3. Balloon; 4. Catheter seat; 5. Connector; 51. Connecting piece; 52. Connecting strip; 6. Guide catheter; 61. Guide channel. DETAILED DESCRIPTION

[0040] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clearly understood, this application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0041] It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.

[0042] 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 accompanying drawings, and are only for the convenience of describing this 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 cannot be understood as a limitation on this application.

[0043] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0044] References to "one embodiment," "some embodiments," or "an embodiment" in this specification mean that a particular feature, structure, or characteristic described in conjunction with that embodiment is included in one or more embodiments of the present invention. Thus, phrases such as "in one embodiment," "in some embodiments," "in other embodiments," and "in other embodiments" appearing in various places in this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. Furthermore, in one or more embodiments, particular features, structures, or characteristics may be combined in any suitable manner.

[0045] The term "proximal end" generally refers to the end of the corresponding component closer to the operator, and the term "distal end" refers to the end of the corresponding component farther from the operator.

[0046] Please refer to Figures 1, 3 and 4 together, and the extension catheter provided in the embodiment of the present application will now be described. The extension catheter includes a tube body 1, a push rod 2 and a balloon 3. An extension channel 11 is provided inside the tube body 1. The extension channel 11 is used to transport medical devices, and an introduction port 12 is provided at the proximal end of the tube body 1. The push rod 2 is connected to the proximal end of the tube body 1 and forms a lap joint. A filling channel 21 is provided inside the push rod 2. The balloon 3 is provided on the tube body 1 and is located at the proximal end of the tube body 1, at the lap joint. The inner cavity of the balloon 3 is connected to the filling channel 21.

[0047] The extension catheter of the embodiment of the present application is provided with a balloon 3 at the proximal end of the tube body 1, and a filling channel 21 connected to the balloon 3 is provided in the push rod 2. The extension catheter is extended along the proximal end of the guiding catheter 6, and one end of the push rod 2 is exposed from the proximal end of the guiding catheter 6, and the distal end of the tube body 1 is exposed from the distal end of the guiding catheter 6. The proximal end of the tube body 1 is located at the distal end of the guiding catheter 6, and the balloon 3 can be filled through the filling channel 21. The filling channel 21 is provided in the push rod 2, which can reduce the radial size of the push rod 2 and is more conducive to the delivery of other instruments. After the balloon 3 is expanded, the outer wall of the balloon 3 is close to the inner cavity of the guiding catheter 6, and the extension catheter is not easy to slip or slip off in the guiding catheter 6, which can enhance the axial stability of the extension catheter in the guiding catheter 6.

[0048] In one embodiment, referring to Figures 1, 3, and 4, the tube body 1 includes an inner layer 13, a reinforcement layer 14, and an outer layer 15. The inner layer 13, reinforcement layer 14, and outer layer 15 are arranged in sequence from the inside out, and the extension channel 11 is located within the inner layer 13. The three-layer composite structure can provide strong support, pressure resistance, and flexural resistance.

[0049] Inner layer 13 is made of polytetrafluoroethylene (PTFE) or linear low-density polyethylene (LLDPE). PTFE is highly lubricating and non-sticky, facilitating the passage of other instruments through extended channel 11 within inner layer 13. LLDPE has high softening and melting temperatures, and offers advantages such as high strength, toughness, rigidity, and excellent heat and cold resistance. It also exhibits excellent resistance to environmental stress cracking, impact strength, and tear resistance.

[0050] The material of the outer layer 15 is a mixture of one or more polyether front-end polyamide, nylon, and polyurethane elastomer, which ensures that the outer surface of the tube body 1 has a smoother appearance and feel, and fully protects the blood vessels from thrombosis, dissection, etc.

[0051] The outer layer 15 material has a decreasing hardness from the proximal end to the distal end of the catheter. This not only prevents deformation but also makes it easier to navigate tortuous lesions. The flexible material at the distal end prevents damage to the vessel wall during insertion, better meeting the requirements of catheter insertion within human blood vessels. This allows doctors to operate more accurately and conveniently while reducing pain for patients during surgery.

[0052] In one embodiment, referring to FIG. 1 , FIG. 3 and FIG. 4 , the reinforcement layer 14 includes a stainless steel braided mesh or a spring, which can improve the strong support, pressure resistance and flexure resistance of the extension catheter.

[0053] In one embodiment, referring to Figures 1, 3 and 4, the material of the balloon 3 is one of silicone rubber, polyurethane elastomer and thermoplastic elastomer. Silicone rubber also has the outstanding characteristics of being physiologically inert and not causing blood coagulation, so it is widely used in the medical field. Polyurethane resin (Polyurethane Resin), as a polymer material with high strength, tear resistance, wear resistance and other properties, is widely used in daily life, industrial and agricultural production, medicine and other fields. Thermoplastic elastomer TPE / TPR, also known as artificial rubber or synthetic rubber. Its products not only have the excellent properties of high elasticity, aging resistance and oil resistance of traditional cross-linked vulcanized rubber, but also have the characteristics of convenient processing and wide processing methods of ordinary plastics.

[0054] In one embodiment, referring to Figures 1, 3, and 4, the push rod 2 has a radial cross-section structure that is elliptical, circular, or semi-arc-shaped. Elliptical and semi-arc-shaped push rods can reduce their thickness, saving space and facilitating the passage of other instruments. A circular push rod 2 ensures greater strength and improved pushing performance.

[0055] In one embodiment, referring to Figures 1, 3 and 4, the push rod 2 is made of a hypotube, which has high hardness, good anti-kink performance and better pushing performance.

[0056] In one embodiment, referring to Figures 1, 2, 3, and 5, the extension catheter further includes a connector 5, which connects the reinforcement layer 14 and the push rod 2. The connector 5 is made of metal, and the connector 5, the push rod 2, and the reinforcement layer 14 are connected by laser welding, ensuring a secure connection between the push rod 2 and the tube body 1. The connection point is in the middle of the tube body 1, which does not damage the blood vessel.

[0057] In one embodiment, referring to Figures 1, 2, 3, and 5, the connector 5 includes a connecting piece 51 and a plurality of connecting strips 52, with the connecting strips 52 connected to opposite sides of the connecting piece 51. The connecting piece 51 and the connecting strips 52 are connected to the reinforcing layer 14, the push rod 2 is connected to the connecting piece 51, and the connecting strips 52 are wrapped around and connected to the inner layer 13. The connecting strips 52 wrap around and connect to the outer side of the inner layer 13, ensuring that the connector 5 is firmly connected to the tube body 1.

[0058] In one embodiment, referring to Figures 1 and 2 , a first through-hole 22 is provided at the distal end of the push rod 2, communicating with the filling channel 21. A second through-hole is provided on the outer layer 15, corresponding to the first through-hole 22. The filling channel 21 communicates with the inner lumen of the balloon 3 through the first through-hole 22 and the second through-hole. Multiple first through-holes 22 are provided, arranged side by side. The first through-holes 22 and the second through-holes communicate with the balloon 3 and the filling channel 21, making it easier for the operator to inject a fluid or other medium through the filling channel 21 to fill the balloon 3, allowing the balloon 3 to quickly anchor within the inner lumen of the guiding catheter 6 and achieve a closure.

[0059] In one embodiment, referring to Figures 1, 2, and 3, the introduction port 12 is configured as an oblique opening. The proximal end of the tube body 1 is configured as an oblique surface, and the oblique introduction port 12 has a larger cross-sectional area than the extension channel 11, facilitating easier delivery of other instruments along the introduction port 12 to the extension channel 11.

[0060] In one embodiment, referring to Figures 1, 2, 3, and 4, the extension catheter further comprises a catheter adapter 4, which is connected to the proximal end of the push rod 2. The catheter adapter 4 is provided within the catheter adapter 4, and the third through hole is connected to the filling channel 21. The catheter adapter 4 is provided at the proximal end of the push rod 2 to facilitate the operator's manipulation.

[0061] In one embodiment, referring to Figures 1, 2, and 4, a first developing ring 151 is provided at the distal end of the tube body 1, and a second developing ring 152 is provided at the proximal end of the tube body 1. The second developing ring 152 is located within the balloon 3. The first developing ring 151 and the second developing ring 152 allow for precise positioning within the patient's body under X-rays, reducing operational difficulty.

[0062] In one embodiment, referring to Figures 1, 2, and 3, balloon 3 is vacuum-sealed against tubular body 1. The distal end of balloon 3 is tightly welded to outer layer 15 of tubular body 1, forming a sealed end. The proximal end of balloon 3 is tightly welded to outer layer 15 of tubular body 1 and the distal end of push rod 2. The welds at both ends of balloon 3 create a smooth transition, with no noticeable bumps or unevenness, ensuring smoother insertion into other channels.

[0063] Referring to Figures 1, 2, 3, and 6, another object of the present application is to provide a medical device comprising a guiding catheter 6 and an extension catheter. The guiding catheter 6 is provided with a guiding channel 61, and a Y-shaped connecting valve is provided at the proximal end of the catheter body 1. The proximal end of the catheter body 1 extends into the guiding channel 61, and the balloon 3 abuts the inner wall of the guiding channel 61 after expansion.

[0064] In one embodiment, the medical device further includes an aspirator, which is connected to the Y-shaped connecting valve and communicates with the guiding channel 61 , and is used to aspirate thrombus.

[0065] The working process of the medical device external aspirator in the embodiment of the present application for aspirating thrombus and plaque:

[0066] A guiding catheter 6 is delivered to the coronary artery ostium, and a guiding guidewire is delivered along the proximal Y-shaped connecting valve of the guiding catheter 6 to the distal end of the coronary artery stenosis. An extension catheter is delivered along the guiding guidewire, and the extension catheter extends into the guiding catheter 6 from the proximal Y-shaped connecting valve of the guiding catheter 6. The distal end of the extension catheter's body 1 emerges from the distal end of the guiding catheter 6, and the proximal end of the body 1 is located within the guiding channel 61. One end of the push rod 2 is located within the guiding channel 61, and the other end emerges from the Y-shaped connecting valve. The catheter adapter 4 is located outside the Y-shaped connecting valve. A balloon 3 is filled through the third through-hole of the catheter adapter 4 and the filling channel 21 within the push rod 2. After expansion, the balloon 3 is anchored within the guiding channel 61. The balloon 3 blocks the gap between the guiding catheter 6 and the body 1, connecting the guiding channel 61 to the extension channel 11. The interface where the push rod 2 extends from the Y-shaped connecting valve of the guiding catheter 6 is sealed. An aspirator is connected to the other interface of the Y-shaped connecting valve to aspirate thrombi and plaque at the distal end of the body 1. Thrombus or calcified plaque etc. flow back to the guiding channel 61 along the extension channel 11 due to the negative pressure until they are drawn out of the body.

[0067] The medical device of the present invention utilizes the aforementioned extension catheter. The proximal end of the catheter body 1 is positioned distal to the guiding catheter 6. After the balloon 3 is inflated, the outer wall of the balloon 3 abuts against the inner lumen of the guiding catheter 6, completely sealing the inner lumen of the guiding catheter 6. The balloon 3 fills the gap between the guiding catheter 6 and the catheter body 1, thereby connecting the guiding channel 61 with the extension channel 11. After the balloon 3 is inflated, the outer wall of the balloon 3 abuts against the inner lumen of the guiding catheter 6, making the extension catheter less likely to slip or fall out of the guiding catheter 6, thereby enhancing the axial stability of the extension catheter within the guiding catheter 6. An aspirator can be connected to the proximal end of the guiding catheter 6, connecting the extension channel 11 with the guiding channel 61 to aspirate thrombi and plaques. This avoids the inconvenience of frequent intraoperative catheter changes, shortens surgical time, reduces surgical difficulty, and alleviates patient pain. Furthermore, the sealing effect of the balloon 3 reduces the possibility of thrombi and plaques escaping, enabling more thorough thrombus removal during aspiration, reducing the escape of small thrombi, and minimizing the risk of post-thrombotic complications.

[0068] The working process of the medical device delivering contrast agent / drug in the embodiment of the present application:

[0069] The guiding catheter 6 is delivered to the coronary artery ostium, and the guiding guidewire is delivered to the distal end of the coronary artery stenosis along the proximal Y-shaped connecting valve of the guiding catheter 6. The extension catheter is delivered along the guiding guidewire, and the extension catheter extends into the guiding catheter 6 from the proximal Y-shaped connecting valve of the guiding catheter 6. The distal end of the tube body 1 of the extension catheter is exposed from the distal end of the guiding catheter 6, and the proximal end of the tube body 1 is located in the guiding channel 61. One end of the push rod 2 is located in the guiding channel 61, and the other end is exposed from the Y-shaped connecting valve. The catheter seat 4 is located outside the Y-shaped connecting valve. The balloon 3 is filled through the third through hole of the catheter seat 4 and the filling channel 21 in the push rod 2. After the balloon 3 is expanded, it is anchored in the guiding channel 61. The balloon 3 blocks the gap between the guiding catheter 6 and the tube body 1, and the guiding channel 61 is connected to the extension channel 11. The interface of the push rod 2 extending from the Y-shaped connecting valve of the guiding catheter 6 is blocked, and the contrast agent / drug is delivered at the other interface of the Y-shaped connecting valve. The contrast agent / drug flows along the guiding channel 61 to the extension channel 11, flows out at the distal end of the tube body 1, and flows to the distal end of the coronary artery stenosis for super-selective angiography / targeted drug administration.

[0070] The medical device of the embodiment of the present application uses the above-mentioned extension catheter. After the proximal end of the tube body 1 is located at the distal end of the guiding catheter 6 and the balloon 3 is expanded, the outer wall of the balloon 3 is close to the inner cavity of the guiding catheter 6, and the inner cavity of the guiding catheter 6 is completely closed. The balloon 3 fills the gap between the guiding catheter 6 and the tube body 1, so that the guiding channel 61 is connected with the extension channel 11. The contrast agent / drug can flow along the guiding channel 61 to the extension channel 11 for super-selective angiography / targeted drug administration. Super-selective angiography avoids the harm to the patient caused by injecting more contrast agent, will not cause allergic reactions, and also avoids the harm caused by X-ray irradiation, which is very practical; targeted drug administration avoids the flow of drugs into non-target areas, thereby causing side effects to the patient, and improves the utilization rate of the drugs.

[0071] To verify the anchoring or sealing effectiveness of the medical device of this embodiment, the applicant conducted a series of tests, using the compression ratio of balloon 3 to indicate the degree of sealing between the extension catheter and the guide catheter 6. Compression ratio = cross-sectional area of ​​balloon 3 within guide catheter 6 / cross-sectional area of ​​balloon 3 when not restrained by guide catheter 6. A smaller compression ratio indicates greater compression and a greater ability to withstand negative suction pressure. See Table 1 for test data.

[0072] Table 1 Test data of Examples 1-9

[0073] The test data in Table 1 show that the extension catheters of Examples 1-9 can all be used in conjunction with the same guide catheter 6 and are suitable for various working conditions. The compression ratio thereof is between 20% and 83%, which can meet the sealing and plugging requirements.

[0074] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. An extension catheter, comprising: A tube body, wherein an extension channel for conveying medical devices is provided inside the tube body, and an introduction port is provided at the proximal end of the tube body; A push rod connected to the proximal end of the tube body to form an overlapped portion, wherein a filling channel is provided inside the push rod; The balloon is arranged on the tube body and is located at the proximal end of the tube body, and the inner cavity of the balloon is communicated with the filling channel.

2. The extension catheter according to claim 1, wherein: The tube body comprises an inner layer, a reinforcement layer and an outer layer which are arranged in sequence from the inside to the outside, and the extension channel is located at the center of the inner layer.

3. The extension catheter according to claim 2, wherein: It also includes a connecting piece, which connects the reinforcing layer and the pushing rod.

4. The extension catheter according to claim 3, wherein: The connecting member includes a connecting plate and a plurality of connecting strips connected to opposite sides of the connecting plate, the connecting plate and each of the connecting strips are connected to the reinforcing layer, the pushing rod is connected to the connecting plate, and each of the connecting strips is wrapped and connected to the inner layer.

5. The extension catheter according to claim 3, wherein: The distal end of the push rod is provided with a first through hole communicating with the filling channel, the outer layer is provided with a second through hole corresponding to the position of the first through hole, and the filling channel is connected with the inner cavity of the balloon through the first through hole and the second through hole.

6. The extension catheter according to any one of claims 1 to 5, wherein: The introduction port is arranged in an oblique manner.

7. The extension catheter according to any one of claims 1 to 5, wherein: It also includes a catheter seat, which is connected to the proximal end of the pushing rod. The catheter seat is provided with a third through hole connected to the filling channel.

8. The extension catheter according to any one of claims 1 to 5, wherein: A first developing ring is arranged at the distal end of the tube body, and a second developing ring is arranged at the proximal end of the tube body. The second developing ring is located in the balloon.

9. A medical device comprising: A guiding catheter, wherein a guiding channel is provided in the guiding catheter; According to any one of claims 1 to 8, the proximal end of the tube body extends into the guiding channel, and the balloon abuts against the inner wall of the guiding channel after expansion.

10. The medical device of claim 9, further comprising an aspirator, wherein: The aspirator is connected to the proximal end of the guiding catheter, is communicated with the guiding channel, and is used to aspirate thrombus.

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