Extension tubes and medical devices

Abstract

The extension tube and medical device include an extension tube comprising a tubular body (1), a push rod (2), and a balloon (3), wherein an extension passage (11) is provided inside the tubular body (1), an inlet (12) is provided at the proximal end of the tubular body (1), the push rod (2) is connected to the proximal end of the tubular body (1), a filling passage (21) is provided inside the push rod (2), and the balloon (3) is provided outside the proximal end of the tubular body (1) and communicates with the filling passage (21). The medical device includes a guide tube (6) and an extension tube, wherein a guide passage (61) is provided inside the guide tube (6), the proximal end of the tubular body (1) is provided at the distal end within the guide passage (61), and the balloon (3) abuts against the inner wall of the guide passage (61) after inflation. The extension tube does not easily slide or fall off within the guide tube (6), so the contrast medium / drug flows along the guide passage (61) into the extension passage, allowing for superselective contrast / medication, and an external suction device can be attached to achieve the function of suctioning thrombus and plaque.

Description

[Technical Field]

[0001] (CROSS-REFERENCE TO RELATED APPLICATIONS) This application claims priority to a Chinese patent application bearing application number 202223593958.5 and entitled "Extension tube and medical device" filed with the China Patent Office on December 29, 2022, the entire contents of which are incorporated herein by reference.

[0002] TECHNICAL FIELD This application relates to the field of medical devices, and more particularly to extension tubes and medical devices. [Background technology]

[0003] Percutaneous transluminal coronary intervention (PCI) is a technique that uses percutaneous puncture technology to deliver a balloon tube and other related instruments to relieve stenosis or blockage in the coronary arteries and restore blood flow through the coronary arteries. With the continuous development of medicine, medical interventional procedures have also made great strides. When an extension tube in a related technique is placed in the lumen of a guide tube, a gap may form due to the fitting relationship, which can cause the extension tube to slide and even become dislodged. Summary of the Invention

[0004] The embodiments of the present application aim to provide an extension tube and a medical device that solves the technical problem of the prior art that the extension tube is prone to sliding inside the guide tube, and therefore may fall off.

[0005] To achieve the above object, the present application adopts the following technical solution: An extension tube is provided, the extension tube comprising a tubular body, a push rod, and a balloon; an extension passage for feeding a medical instrument into the inside of the tubular body, and an inlet port at the proximal end of the tubular body; the push rod is coupled to the proximal end of the tubular body to form a joint, the push rod having a fill passage therein; The balloon is provided on the tubular body and is located at the proximal end of the tubular body, and the lumen of the balloon communicates with the filling passage.

[0006] In one embodiment, the pipe body includes an inner layer, a reinforcing layer, and an outer layer, which are arranged in this order from the inside to the outside, and the extension passage is located within the inner layer.

[0007] In one embodiment, the extension tube further comprises a connecting member, the connecting member connecting the reinforcing layer and the push rod.

[0008] In one embodiment, the reinforcing layer comprises a stainless steel interwoven mesh or spring.

[0009] In one embodiment, the material of the inner layer is polytetrafluoroethylene or linear low density polyethylene.

[0010] In one embodiment, the material of the outer layer is one or a mixture of polyether block polyamide, nylon, and polyurethane elastomer.

[0011] In one embodiment, the hardness of the outer layer material decreases progressively from the proximal end to the distal end of the tube.

[0012] In one embodiment, the material of the balloon is one of silicone rubber, polyurethane elastomer, and thermoplastic elastomer.

[0013] In one embodiment, the radial cross-sectional structure of the push rod may be one of an elliptical shape, a circular shape, and a semicircular arc shape.

[0014] In one embodiment, the push rod material is hypotube.

[0015] In one embodiment, the connecting member comprises a connecting piece and a plurality of connecting strips connected to opposite sides of the connecting piece, each of the connecting piece and the connecting strips being connected to the reinforcing layer, the push rod being connected to the connecting piece, and each of the connecting strips being connected by wrapping around the inner layer.

[0016] In one embodiment, a first through hole communicating with the filling passage is provided at the distal end of the push rod, a second through hole is provided in the outer layer corresponding to the position of the first through hole, and the filling passage communicates with the inner cavity of the balloon via the first through hole and the second through hole.

[0017] In one embodiment, the inlet is provided with an oblique cross section.

[0018] In one embodiment, the extension tube further comprises a tube seat, the tube seat being coupled to the proximal end of the push rod, the tube seat having a third through hole communicating with the filling passage.

[0019] In one embodiment, a first developer ring is provided at the distal end of the tubular body and a second developer ring is provided at the proximal end of the tubular body, the second developer ring being located within the balloon.

[0020] In one embodiment, the balloon is mounted flat on a tubular 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.

[0021] Another object of the present application is to provide a medical device, the medical device comprising: a guide tube having a guide passage provided therein; The extension tube includes a proximal end of the tubular body inserted into the guide passage, and the balloon abuts against the inner wall of the guide passage after being inflated.

[0022] In one embodiment, the medical device further comprises an aspirator, the aspirator being connected to the proximal end of the guide tube, the aspirator being in communication with the guide passage, and the aspirator being used to aspirate thrombus.

[0023] The extension tube provided in the embodiments of the present application has the following beneficial effects: Compared with the prior art, the extension tube of the embodiments of the present application has a balloon at the proximal end of the tubular body, a filling passage in the push rod communicating with the balloon, the extension tube is inserted along the proximal end of the guide tube, one end of the push rod is exposed at the proximal end of the guide tube, and the distal end of the tubular body is exposed at the distal end of the guide tube, and the proximal end of the tubular body is located at the distal end of the guide tube, allowing the balloon to be filled through the filling passage. After the balloon is inflated, the outer wall of the balloon fits tightly against the lumen of the guide tube, preventing the extension tube from easily sliding or falling off within the guide tube, thereby improving the axial stability of the extension tube within the guide tube.

[0024] The medical device provided in the embodiments of the present application has the following advantageous effects. Compared with the prior art, the medical device of the embodiments of the present application uses the above-mentioned extension tube, with the proximal end of the tubular body positioned at the distal end of the guide tube. After the balloon is inflated, the outer wall of the balloon fits tightly against the lumen of the guide tube, completely occluding the lumen of the guide tube. The contrast agent / drug is injected from the proximal end of the guide tube, flows along the guide channel, and enters the extension channel from the inlet to perform superselective contrast imaging (injecting contrast agent to reveal the condition of coronary artery lesions) / medication. The extension channel is connected to the guide channel, and an external suction device can be attached to the proximal end of the guide tube. The suction device can be used to connect the extension channel and the guide channel to aspirate thrombus and plaque, thereby avoiding the need for frequent interventional tube replacement during surgery, shortening the surgical time, reducing the difficulty of the surgery, and easing the patient's discomfort. [Brief explanation of the drawings]

[0025] [Figure 1] 1 is a schematic diagram illustrating the structure of an extension tube according to an embodiment of the present application. [Figure 2] 10 is a schematic diagram showing the structure of a connection portion between a push rod and a tube body of an extension tube according to an embodiment of the present application. FIG. [Figure 3] 1 is a cross-sectional view of a tube body of an extension tube according to an embodiment of the present application. [Figure 4] FIG. 10 is a cross-sectional view of a push rod of an extension tube according to an embodiment of the present application. [Figure 5] 3A and 3B are schematic diagrams illustrating the structure of a connecting member of an extension tube according to an embodiment of the present application. [Figure 6] 1 is a schematic diagram showing the structure of a connecting portion between a tubular body and a guide tube of a medical device according to an embodiment of the present application. DETAILED DESCRIPTION OF THE INVENTION

[0026] In order to more clearly explain the technical solutions in the embodiments of the present application, the drawings used in the description of the embodiments or prior art are briefly introduced above. Obviously, the above drawings are only some embodiments of the present application, and those skilled in the art can also obtain other related drawings based on these drawings without any creative efforts.

[0027] In order to more clearly explain the technical problems, technical solutions and beneficial effects that the present application aims to solve, the present application will be described in more detail below with reference to the drawings and examples. It should be understood that the specific examples described herein are only used to illustrate the present application and are not intended to limit the present application.

[0028] It should be understood that when an element is referred to as being "fixed" or "mounted" to another element, the element may be directly or indirectly disposed relative to the other element. When an element is referred to as being "coupled" to another element, the element may be directly or indirectly coupled to the other element.

[0029] It should be understood that the orientations or positional relationships indicated by the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," and "outside" are based on the orientations or positional relationships shown in the drawings, and are intended only to facilitate and simplify the description of the embodiments of the present application, and do not indicate or suggest that the specified devices or elements necessarily have a particular orientation or must be configured or operated in a particular orientation, and therefore should not be understood as limitations on the embodiments of the present application.

[0030] Additionally, terms such as "first," "second," etc. are used for descriptive purposes only and are not to be understood as indicating or suggesting the relative importance or number of technical features depicted. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of such features. In this specification, "plurality" means two or more than two, unless otherwise specified.

[0031] In the specification of this application, the references to "one embodiment," "some embodiments," or "embodiments" mean that one or more embodiments of the application include a particular feature, structure, or characteristic described in connection with that embodiment. Thus, the appearances of phrases such as "in one embodiment," "in some embodiments," "in other embodiments," and "in yet other embodiments" in various places throughout this specification are not necessarily referring to the same embodiment and, unless otherwise emphasized, may mean "in one or more embodiments, but not all embodiments." Furthermore, in one or more embodiments, particular features, structures, or characteristics may be combined in any suitable manner.

[0032] The term "proximal end" generally refers to the end of the corresponding member that is closer to the operator, and the term "distal end" generally refers to the end of the corresponding member that is further from the operator.

[0033] 1, 3, and 4, an extension tube provided in an embodiment of the present application will be described. The extension tube comprises a tubular body 1, a push rod 2, and a balloon 3. An extension passage 11 for feeding a medical instrument into the inside of the tubular body 1 is provided, and an introduction port 12 is provided at the proximal end of the tubular body 1. The push rod 2 is connected to the proximal end of the tubular body 1 to form a connection part, and a filling passage 21 is provided inside the push rod 2. The balloon 3 is provided in the tubular body 1 and is located at the proximal end of the tubular body 1 and at the connection part, and the lumen of the balloon 3 communicates with the filling passage 21.

[0034] In the embodiment of the present application, the extension tube has a balloon 3 at the proximal end of the tubular body 1, and a filling passage 21 communicating with the balloon 3 is provided in the push rod 2. The extension tube is inserted along the proximal end of the guide tube 6, one end of the push rod 2 is exposed at the proximal end of the guide tube 6, and the distal end of the tubular body 1 is exposed at the distal end of the guide tube 6, and the proximal end of the tubular body 1 is located at the distal end of the guide tube 6. The balloon 3 can be filled through the filling passage 21. By providing the filling passage 21 on the push rod 2, the radial size of the push rod 2 is reduced, which is more convenient for feeding other instruments. After the balloon 3 is inflated, the outer wall of the balloon 3 fits tightly against the inner lumen of the guide tube 6, preventing the extension tube from easily sliding or falling off within the guide tube 6. This improves the axial stability of the extension tube within the guide tube 6.

[0035] 1, 3 and 4, the pipe 1 includes an inner layer 13, a reinforcing layer 14 and an outer layer 15, which are arranged in order from the inside to the outside, and the extension passage 11 is located within the inner layer 13. The three-layer composite structure provides strong support, pressure resistance and folding resistance.

[0036] The material of the inner layer 13 is polytetrafluoroethylene or linear low-density polyethylene. Polytetrafluoroethylene has high lubricity and non-stick properties, making it easy for other instruments to pass through the extension passage 11 in the inner layer 13. Linear low-density polyethylene has advantages such as a high softening temperature and melting temperature, high strength, high toughness, high rigidity, and good heat and cold resistance, and also has good environmental stress crack resistance, impact strength, tear resistance, etc.

[0037] The outer layer 15 is made of a mixture of one or more of polyether block polyamide, nylon, and polyurethane elastomer, which gives the outer surface of the tubular body 1 a smoother appearance and feel and adequately protects the blood vessels from blood clots, peeling, etc.

[0038] The hardness of the outer layer 15 material gradually decreases from the proximal end to the distal end of the tube, which not only prevents deformation but also makes it easier to pass through tortuous lesions, and the distal end is made of a flexible material to avoid damaging the blood vessel wall during pushing, better meeting the demands of pushing the tube through the human blood vessels, allowing doctors to operate it more accurately and easily and reducing the patient's pain during surgery.

[0039] In one embodiment, referring to FIGS. 1, 3 and 4, the reinforcing layer 14 comprises a stainless steel interwoven mesh or spring, which can improve the strength, pressure resistance and folding resistance of the extension tube.

[0040] In one embodiment, referring to FIGS. 1, 3, and 4, the material of the balloon 3 is a type of silicone rubber, polyurethane elastomer, or thermoplastic elastomer. Silicone rubber is physiologically inert and has excellent properties such as not causing blood coagulation, making it widely used in the medical field. Polyurethane resin is a polymer material with properties such as high strength, tear resistance, and abrasion resistance, and is widely used in fields such as daily life, industrial and agricultural production, and medicine. Thermoplastic elastomers (TPE / TPR) are also called artificial or synthetic rubbers. These products have various excellent properties of traditional cross-linked vulcanized rubber, such as high elasticity, aging resistance, and oil resistance, while also possessing the characteristics of general plastics, such as ease of processing and a wide range of processing methods.

[0041] 1, 3, and 4, in one embodiment, the radial cross-sectional structure of the push rod 2 is one of elliptical, circular, and semicircular arc shapes. The elliptical and semicircular arc shapes of the push rod can reduce the thickness of the push rod, saving space and facilitating the passage of other instruments. The circular push rod 2 has good strength and better pushing performance.

[0042] 1, 3 and 4, in one embodiment, the push rod 2 is made of a hypotube, which has high hardness, good kink resistance and superior pushing performance.

[0043] 1, 2, 3 and 5, in one embodiment, the extension tube further includes a connecting member 5, which connects the reinforcing layer 14 and the push rod 2. The connecting member 5 is made of a metal material, and the connecting member 5, the push rod, and the reinforcing layer 14 are connected by laser welding, thereby firmly connecting the push rod 2 to the tubular body 1, and since the connecting portion is located in the center of the tubular body 1, no damage will be caused to the blood vessel.

[0044] 1, 2, 3, and 5, the connecting member 5 includes a connecting piece 51 and a plurality of connecting strips 52, and the plurality of connecting strips 52 are connected to opposite sides of the connecting piece 51. Each of the connecting piece 51 and the connecting strips 52 is connected to the reinforcing layer 14, the push rod 2 is connected to the connecting piece 51, and each of the connecting strips 52 is wrapped around and connected to the inner layer 13. The connecting strips 52 are wrapped around and connected to the outside of the inner layer 13 in an annular shape, so that the connecting member 5 can be firmly connected to the pipe body 1.

[0045] 1 and 2 , in one embodiment, a first through-hole 22 is provided at the distal end of the push rod 2, and the first through-hole 22 is connected to the filling passage 21. A second through-hole is provided in the outer layer 15, and the second through-hole is provided at a position corresponding to the first through-hole 22, and the filling passage 21 is connected to the inner cavity of the balloon 3 via the first through-hole 22 and the second through-hole. A plurality of first through-holes 22 are provided, and the plurality of first through-holes 22 are arranged side by side, and the first through-holes 22 and the second through-holes are provided to communicate with the balloon 3 and the filling passage 21. This allows an operator to inject a medium such as a fluid through the filling passage 21 to fill the balloon 3, thereby facilitating rapid fixation and sealing of the balloon 3 in the inner cavity of the guide tube 6.

[0046] 1, 2, and 3, inlet 12 is provided with an oblique cross section. The cross section of the proximal end of tubular body 1 is provided with an oblique cross section, and inlet 12 provided with an oblique cross section facilitates delivery of other instruments along inlet 12 to extension passage 11 more easily because the cross-sectional area of ​​inlet 12 is larger than the cross-sectional area of ​​extension passage 11.

[0047] 1, 2, 3 and 4, in one embodiment, the extension tube further includes a tube seat 4, which is connected to the proximal end of the push rod 2, and which has a third through-hole formed in the tube seat 4, which communicates with the filling passage 21. Providing the tube seat 4 at the proximal end of the push rod 2 makes it easier for the operator to grip the extension tube.

[0048] 1, 2 and 4, in one embodiment, a first development ring 151 is provided at the distal end of the tubular body 1, and a second development ring 152 is provided at the proximal end of the tubular body 1, and the second development ring 152 is located within the balloon 3. By providing the first development ring 151 and the second development ring 152, accurate positioning within the patient's body under radiation is possible, reducing the difficulty of operation.

[0049] 1, 2 and 3, in one embodiment, the balloon 3 is attached flat to the tubular body 1 by vacuum, and the distal end of the balloon 3 is tightly welded to the outer layer 15 of the tubular body 1 to form a sealed end, and the proximal end of the balloon 3 is tightly welded to the outer layer 15 of the tubular body 1 and the distal end of the push rod 2. The welds at both ends of the balloon 3 are smooth and have no obvious unevenness, which reduces the resistance of instruments entering other passages and makes them smoother.

[0050] 1, 2, 3, and 6, another object of the present application is to provide a medical device comprising a guide tube 6 and an extension tube, a guide passage 61 provided in the guide tube 6, and a Y-shaped connecting valve provided at the proximal end of the tubular body 1. The proximal end of the tubular body 1 is inserted into the guide passage 61, and the balloon 3 abuts against the inner wall of the guide passage 61 after being inflated.

[0051] In one embodiment, the medical device further comprises a suction device, the suction device is connected to the Y-shaped connecting valve, the suction device communicates with the guiding passage 61, and the suction device is used to suction the thrombus.

[0052] The process of aspirating thrombus and plaque by externally attaching an aspirator to the medical device of the embodiment of the present application is as follows.

[0053] The guide tube 6 is advanced to the coronary artery ostium, and a guide wire is advanced along the Y-shaped connecting valve at the proximal end of the guide tube 6 to the distal end of the coronary artery stenosis. An extension tube is advanced along the guide wire, and the extension tube is inserted into the guide tube 6 through the Y-shaped connecting valve at the proximal end of the guide tube 6. The distal end of the tubular body 1 of the extension tube is exposed from the distal end of the guide tube 6, and the proximal end of the tubular body 1 is located within the guide passage 61. One end of the push rod 2 is located within the guide passage 61, and the other end is exposed from the Y-shaped connecting valve. The tube base 4 is located outside the Y-shaped connecting valve. The balloon 3 is filled through the third through-hole of the tube base 4 and the filling passage 21 in the push rod 2. After inflation, the balloon 3 is fixed within the guide passage 61, sealing the gap between the guide tube 6 and the tubular body 1. The guide passage 61 communicates with the extension passage 11. The connection port of the push rod 2 protruding from the Y-shaped connection valve of the guide tube 6 is blocked, and an aspirator is connected to the other connection port of the Y-shaped connection valve to aspirate the thrombus and plaque at the distal end of the tubular body 1. The thrombus, calcified plaque, etc. are forced to flow back along the extension passage 11 into the guide passage 61 by the action of negative pressure and are extracted outside the body.

[0054] The medical device of the present application uses the above-mentioned extension tube, and the proximal end of the tubular body 1 is located at the distal end of the guide tube 6. After the balloon 3 is inflated, the outer wall of the balloon 3 fits tightly against the lumen of the guide tube 6, completely blocking the lumen of the guide tube 6. The balloon 3 fills the gap between the guide tube 6 and the tubular body 1, allowing the guide passage 61 to communicate with the extension passage 11. After the balloon 3 is inflated, the outer wall of the balloon 3 fits tightly against the lumen of the guide tube 6, preventing the extension tube from easily sliding or falling off within the guide tube 6. This improves the axial stability of the extension tube within the guide tube 6. An external suction device can be attached to the proximal end of the guide tube 6, which can be used to connect the extension passage 11 with the guide passage 61 and aspirate thrombus and plaque. This avoids the need to frequently change interventional tubes during surgery, shortens the surgical time, reduces the difficulty of the surgery, and alleviates the patient's discomfort. Furthermore, the sealing action of the balloon 3 reduces the possibility of thrombus and plaque escaping, so that during the suction process, thrombus is removed more thoroughly, reducing the possibility of small thrombus escaping and reducing the probability of thrombotic sequelae.

[0055] The process of delivering contrast agent / drug by the medical device of the present application is as follows.

[0056] The guide tube 6 is advanced to the coronary artery ostium, and a guide wire is advanced along the Y-shaped connecting valve at the proximal end of the guide tube 6 to the distal end of the coronary artery stenosis. An extension tube is advanced along the guide wire, and the extension tube is inserted into the guide tube 6 through the Y-shaped connecting valve at the proximal end of the guide tube 6. The distal end of the tubular body 1 of the extension tube is exposed from the distal end of the guide tube 6, and the proximal end of the tubular body 1 is located within the guide passage 61. One end of the push rod 2 is located within the guide passage 61, and the other end is exposed from the Y-shaped connecting valve. The tube base 4 is located outside the Y-shaped connecting valve. The balloon 3 is filled through the third through-hole of the tube base 4 and the filling passage 21 in the push rod 2. After inflation, the balloon 3 is fixed within the guide passage 61, sealing the gap between the guide tube 6 and the tubular body 1. The guide passage 61 communicates with the extension passage 11. The connecting port of the push rod 2 protruding from the Y-shaped connecting valve of the guide tube 6 is blocked, and the contrast agent / drug is fed from the other connecting port of the Y-shaped connecting valve. The contrast agent / drug flows along the guide passage 61 into the extension passage 11, flows out from the distal end of the tubular body 1, and flows to the distal end of the coronary artery stenosis, thereby performing superselective contrast imaging / targeted drug administration.

[0057] The medical device of the present application uses the above-mentioned extension tube, with the proximal end of tubular body 1 positioned at the distal end of guide tube 6. After balloon 3 is inflated, the outer wall of balloon 3 fits tightly against the lumen of guide tube 6, completely blocking the lumen. Balloon 3 fills the gap between guide tube 6 and tubular body 1, connecting guide channel 61 to extension channel 11. Contrast agent / drug flows along guide channel 61 into extension channel 11, enabling superselective imaging / targeted administration. Superselective imaging avoids the risk of injury to patients caused by large injections of contrast agent, allergic reactions, and the risk of X-ray radiation, making it very practical. Targeted administration avoids the side effects of drug flowing into non-target areas and improves drug utilization.

[0058] In order to verify the fixing or sealing effect of the medical device of the embodiment of the present application, the applicant conducted a series of tests, in which the compression ratio of the balloon 3 indicates the degree of sealing between the extension tube and the guide tube 6, where compression ratio = cross-sectional area of ​​the balloon 3 within the guide tube 6 / cross-sectional area of ​​the balloon 3 when the balloon 3 is not restricted by the guide tube 6, and it can be seen that the smaller the compression ratio, the stronger the compression and the greater the suction negative pressure that can be received. See Table 1 for the test data.

[0059] [Table 1]

[0060] As can be seen from the verification data in Table 1, the extension tubes of Examples 1 to 9 can be used in combination with the same guide tube 6 and are applicable to various working situations. Their compression ratios are 20% to 83%, and they can meet the sealing and occlusion requirements.

[0061] The above are only preferred embodiments of the present application, and do not limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall fall within the protection scope of the present application. [Explanation of symbols]

[0062] 1. Body 11 Extension passage 12 Introduction 13 Inner layer 14 Reinforcement layer 15 Outer layer 151 First developing ring 152 Second developing ring 2 push rods 21 Filling passage 22 First through hole 3. Balloon 4 Tube base 5 Connecting members 51 Connecting piece 52 Connecting Strips 6 Guidance tube 61 Guidance passage

Claims

1. an extension tube comprising a tubular body, a push rod, and a balloon; an extension passage for feeding a medical instrument into the inside of the tubular body, and an inlet port at the proximal end of the tubular body; the push rod is coupled to the proximal end of the tubular body to form a joint, the push rod having a fill passage therein; The balloon is provided on the tubular body and is located at the proximal end of the tubular body, and the lumen of the balloon communicates with the filling passage.

2. The pipe body includes an inner layer, a reinforcing layer, and an outer layer, which are sequentially provided from the inside to the outside, and the extension passage is located at the center of the inner layer. The extension tube of claim 1 .

3. The extension tube further includes a connecting member, the connecting member connecting the reinforcing layer and the push rod. The extension tube of claim 2 .

4. The connecting member includes a connecting piece and a plurality of connecting strips connected to opposite sides of the connecting piece, each of the connecting piece and the connecting strips being connected to the reinforcing layer, the push rod being connected to the connecting piece, and each of the connecting strips being connected to the inner layer while wrapping around it. The extension tube of claim 3 .

5. a first through hole communicating with the filling passage is provided at the distal end of the push rod, a second through hole is provided in the outer layer at a position corresponding to the first through hole, and the filling passage communicates with the inner cavity of the balloon via the first through hole and the second through hole; The extension tube of claim 3 .

6. The inlet is provided to have an oblique cross section. The extension tube according to any one of claims 1 to 5.

7. The extension tube further includes a tube seat, the tube seat being connected to a proximal end of the push rod, and a third through-hole being formed in the tube seat and communicating with the filling passage. The extension tube according to any one of claims 1 to 5.

8. a first developer ring provided at a distal end of the tubular body and a second developer ring provided at a proximal end of the tubular body, the second developer ring being located within the balloon; The extension tube according to any one of claims 1 to 5.

9. A medical device, a guide tube having a guide passage provided therein; 9. A medical device comprising: an extension tube according to any one of claims 1 to 8, wherein a proximal end of the tubular body is inserted into the guide passage, and the balloon abuts against the inner wall of the guide passage after being inflated.

10. The medical device further comprises a suction device, the suction device being connected to a proximal end of the guide tube, the suction device being in communication with the guide passage, and the suction device being used to suction thrombus. The medical device of claim 9.

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