A medical tube and a balloon catheter

Abstract

The present invention provides a medical tube and a balloon catheter. The balloon catheter includes an inner tube, and the inner tube is the medical tube. The medical tube includes a first tube body and a second tube body, and the second tube body is sleeved on the outer surface of the first tube body. Among them, the second tube body is a metal hypotube, and the friction coefficient of the inner surface of the first tube body is smaller than that of the inner surface of the second tube body. The medical tube has good pushability, and when the medical tube is sleeved on a guide wire and travels along the guide wire, the frictional force generated between it and the guide wire is small, improving the smoothness of the medical tube during travel and avoiding blockage that may lead to an extended operation time.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly relates to a medical tube and a balloon catheter. Background Art

[0002] Peripheral arterial disease is a local ischemic disease of the body caused by local stenosis or occlusion of peripheral arteries. After local stenosis or occlusion of the lower limb arteries, symptoms such as intermittent claudication, cold skin of the legs or feet, chronic pain, and gangrene will occur. For ischemic diseases, the current main treatment methods include drug treatment, surgical treatment, and interventional treatment.

[0003] Balloon catheters can be used for the interventional treatment of peripheral arterial diseases. For example, they can be applied to the dilation of stenosis or occlusive lesions caused by atherosclerosis in arteries below the groin (specifically including iliac arteries, femoral arteries, superficial femoral arteries, popliteal arteries, infrapopliteal arteries, etc.). Currently, stainless steel hypotubes are used as the inner tubes in balloon catheters for peripheral arterial diseases, which have excellent pushability and trackability. However, the friction coefficient of stainless steel hypotubes is relatively large. Therefore, when the balloon catheter is pushed or retracted along the guide wire, there is a large frictional force, resulting in sluggish movement of the balloon catheter and prolonging the operation time. Summary of the Invention

[0004] The purpose of the present invention is to provide a medical tube and a balloon catheter. When the medical tube is sleeved on the guide wire and moves along the guide wire, there is a small frictional force between them, which will not cause blockage to the movement of the medical tube.

[0005] To achieve the above purpose, the present invention provides a medical tube, which includes a first tube body and a second tube body, and the second tube body is sleeved on the outer surface of the first tube body; wherein, the second tube body is a metal hypotube, and the friction coefficient of the inner surface of the first tube body is smaller than the friction coefficient of the inner surface of the second tube body.

[0006] Optionally, the medical tube further includes a third tube body, and the third tube body is sleeved on the outer surface of the second tube body.

[0007] Optionally, the material of the first tube body is polytetrafluoroethylene.

[0008] Optionally, the first tube body is provided with a weakening structure.

[0009] Optionally, the weakening structure is a groove, and the groove is arranged on the outer surface of the first tube body, or the groove penetrates through the tube wall of the first tube body.

[0010] Optionally, the groove spirally surrounds along the axis of the first tube body to form a spiral structure.

[0011] Optionally, the cross-section of the first tube body is circular or regular polygon.

[0012] Optionally, the first tube body and the second tube body are in interference fit.

[0013] Optionally, the distal ends of both the first tube body and the third tube body protrude from the distal end of the second tube body, and the distal end of the first tube body is connected to the distal end of the third tube body; and / or,

[0014] The proximal ends of both the second tube body and the first tube body protrude from the proximal end of the third tube body, and the proximal end of the second tube body is connected to the proximal end of the first tube body.

[0015] To achieve the above object, the present invention further provides a balloon catheter, including a catheter body and a balloon. The catheter body includes an outer tube and an inner tube. The inner tube is the medical tubing as described in any one of the preceding items. The inner tube is partially inserted into the outer tube, and a liquid flow channel is formed between the outer surface of the inner tube and the inner surface of the outer tube. The distal end of the inner tube extends out of the distal end of the outer tube; the balloon is sleeved on the outer surface of the distal end of the inner tube, and the distal end of the balloon is connected to the distal end of the inner tube. The proximal end of the balloon is connected to the distal end of the outer tube and is also communicated with the liquid flow channel.

[0016] Compared with the prior art, the medical tubing and the balloon catheter of the present invention have the following advantages:

[0017] The aforementioned medical tubing includes a first tube body and a second tube body. The second tube body is sleeved on the outer surface of the first tube body; wherein, the second tube body is a metal hypotube, and the friction coefficient of the inner surface of the first tube body is smaller than that of the inner surface of the second tube body. This medical tubing has both pushability and flexibility. The inner cavity of the first tube body of the medical tubing can be used as a guide wire cavity to allow the medical tubing to move along the guide wire. Since the friction coefficient of the inner surface of the first tube body is small, the frictional resistance between the medical tubing and the guide wire during movement can be reduced. Description of the Drawings

[0018] The drawings are used to better understand the present invention and do not constitute an improper limitation to the present invention. Among them:

[0019] Figure 1 is a schematic structural view of the medical tubing provided by the present invention according to an embodiment;

[0020] Figure 2 is a schematic structural view of the medical tubing provided by the present invention according to an embodiment, and the third tube body is not shown in the figure;

[0021] Figure 3 is Figure 1 a schematic cross-sectional view of the medical tubing shown;

[0022] Figure 4 is a schematic structural view of the first tube body of the medical tube according to an embodiment of the present invention;

[0023] Figure 5 is a schematic structural view of the medical tube according to an embodiment of the present invention, in which the two ends of the first tube body, the second tube body and the third tube body are not flush;

[0024] Figure 6 is a schematic structural view of the balloon catheter according to an embodiment of the present invention;

[0025] Figure 7 is Figure 6 the Y-Y cross-sectional view of the balloon catheter shown;

[0026] Figure 8 is Figure 6 the P-P cross-sectional view of the balloon catheter shown;

[0027] Figure 9 is Figure 6 the Y-Y cross-sectional view of the balloon catheter shown, Figure 9 in which the shape of the cross-section of the first tube body is different from that of Figure 7 ;

[0028] Figure 10 is Figure 6 the P-P cross-sectional view of the balloon catheter shown, Figure 10 in which the shape of the cross-section of the first tube body is different from that of Figure 8 ;

[0029] [Explanation of the reference numerals is as follows]:

[0030] 1 - heat shrinkable tube;

[0031] 10 - catheter body, 100 - inner tube, 110 - first tube body, 120 - second tube body, 130 - third tube body, 11 - liquid flow channel, 200 - outer tube;

[0032] 20 - balloon;

[0033] 30 - connecting piece, 31 - first joint, 32 - second joint;

[0034] 40 - stress diffusion tube;

[0035] 50 - imaging element. Detailed implementation manners

[0036] The following describes the embodiments of the present invention through specific examples. Those skilled in the art can easily understand the other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the diagrams provided in this embodiment only illustrate the basic concept of the present invention in a schematic manner. Therefore, only the components related to the present invention are shown in the diagrams, rather than being drawn according to the number, shape, and size of the components in actual implementation. The type, quantity, and ratio of each component in actual implementation can be arbitrarily changed, and the component layout type may also be more complex.

[0037] In addition, each of the following embodiments of the description has one or more technical features. However, this does not mean that those who use the present invention must implement all the technical features in any one embodiment at the same time, or can only separately implement some or all of the technical features in different embodiments. In other words, on the premise that implementation is possible, those skilled in the art can, according to the disclosure of the present invention and depending on design specifications or implementation requirements, selectively implement some or all of the technical features in any one embodiment, or selectively implement the combination of some or all of the technical features in multiple embodiments, thereby increasing the flexibility when implementing the present invention.

[0038] As used in this specification, the singular forms "a", "an", and "the" include plural objects, and the plural form "plural" includes more than two objects, unless the content clearly indicates otherwise. As used in this specification, the term "or" is generally used in the sense of including "and / or", unless the content clearly indicates otherwise, and the terms "install", "connect", and "couple" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be directly connected or indirectly connected through an intermediate medium. It can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] To make the objectives, advantages, and features of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. It should be noted that the drawings are all in a very simplified form and use non-precise ratios, only for the purpose of facilitating and clearly assisting in explaining the objectives of the embodiments of the present invention. The same or similar reference numerals in the drawings represent the same or similar components.

[0040] In this text, the terms "proximal" and "distal" refer to the relative orientation, relative position, and direction of components or actions with respect to each other from the perspective of a doctor using the medical device. Although "proximal" and "distal" are not restrictive, "proximal" generally refers to the end of the medical device that is closer to the doctor during normal operation, while "distal" generally refers to the end that first enters the patient's body.

[0041] Figure 1 And Figure 2 The structural schematic diagram of the medical tubing provided by an embodiment of the present invention is shown. Figure 3 Is Figure 1 The cross-sectional schematic diagram of the shown medical tubing.

[0042] Please refer to Figures 1 to 3 , the medical tubing includes a first tube body 110 and a second tube body 120, and the second tube body 120 is sleeved on the outer surface of the first tube body 110. Among them, the second tube body 120 is a metal hypotube, and the friction coefficient of the inner surface of the first tube body 110 is less than the friction coefficient of the inner surface of the second tube body 120. The medical tubing can be used in a medical device including a tube assembly, and the medical device is, for example, a balloon catheter. In this way, the medical tubing can be used as the inner tube 100 of the balloon catheter (as Figure 7 marked), so that the inner cavity of the first tube body 110 serves as a guide wire lumen for threading a guide wire, and during actual operation, the medical tubing is pushed or retracted along the guide wire. Since the second tube body 120 is a metal hypotube, the medical tubing has both good pushability and flexibility, which is beneficial for the medical tubing to pass through tortuous blood vessels along the guide wire, and the friction coefficient of the inner surface of the first tube body 110 is small. Therefore, during the advancement of the medical tubing, the frictional resistance generated between the guide wire and the inner surface of the first tube body 110 is small, avoiding the blockage of the medical tubing during advancement and prolonging the operation time. In this embodiment, the material of the first tube body 110 is, for example, polytetrafluoroethylene (PTFE) or other polymer materials with a small surface friction coefficient, good biocompatibility, and no degradation in the living body.

[0043] The embodiment of the present invention does not particularly limit the shape of the cross-section of the first tube body 110, and it can be circular (as Figure 2 , Figure 7 And Figure 8 shown), or it can be rectangular or regular polygon such as regular octagon (as Figure 9 And Figure 10 shown), regular hexagon, etc., and even can be an irregular shape.

[0044] Preferably, a weakening structure may be provided on the first tube body 110 to reduce the rigidity of the first tube body 110, thereby improving the flexibility of the medical tube. Figure 4 As shown in FIG. 1 , the groove 111 may be disposed on the outer surface of the first tube body 110, or the groove 111 may penetrate the tube wall of the first tube body 110. The groove 111 preferably spirals around the axis of the first tube body 110 to form a spiral structure.

[0045] The second tube body 120 is formed with a hole 121 by cutting so that the second tube body 120 forms a sea wave tube. The hole 121 can be spirally wound along the axis of the second tube body 120 to form a spiral structure, and the flexibility and pushability of the second tube body 120 can be adjusted by adjusting the pitch of the spiral structure, thereby adjusting the flexibility and pushability of the medical tube.

[0046] Furthermore, the medical tube further includes a third tube body 130, and the third tube body 130 is sleeved on the outer surface of the second tube body 120. The embodiment of the present invention does not specifically limit the material of the third tube body 130, and the third tube body 130 can be made of any suitable polymer material.

[0047] Next, the manufacturing process of the medical tubing will be described.

[0048] First, the first tube 110 , the second tube 120 , and the third tube 130 are provided. The outer diameter of the first tube 110 is slightly larger than the inner diameter of the second tube 120 .

[0049] Then, the second tube 120 is sleeved on the outer surface of the first tube 110 so that the first tube 110 and the second tube 120 are interference fit. Also, the third tube 130 is sleeved on the outer surface of the second tube 120. Moreover, the distal end of the third tube 130 protrudes from the distal end of the second tube 120, the distal end of the first tube 110 protrudes from the distal end of the third tube 130, the proximal end of the second tube 120 protrudes from the proximal end of the third tube 130, and the proximal end of the first tube 110 protrudes from the proximal end of the second tube 120 (such as Figure 5 shown).

[0050] Then, the distal end of the first tube 110 is connected to the distal end of the third tube 130 by laser welding, and the portion of the distal end of the first tube 110 protruding from the distal end of the third tube 130 is cut off, so that the distal end of the first tube 110 is flush with the distal end of the third tube 130. And, a heat shrink tube 1 (such as Figure 5As shown in the figure, heat the heat-shrinkable tube 1 to connect the proximal end of the second tube body 120 to the proximal end of the first tube body 110. Then remove the heat-shrinkable tube 1 and cut off the part of the proximal end of the first tube body 110 that protrudes from the second tube body 120, so that the proximal end of the first tube body 110 is flush with the proximal end of the second tube body 120.

[0051] Further, as Figures 6 to 10 shown, an embodiment of the present invention further provides a balloon catheter, which includes a catheter body 10 and a balloon 20. Among them, the catheter body 10 includes an inner tube 100 and an outer tube 200. The inner tube 100 is the aforementioned medical tubing, and the inner tube 100 is partially inserted into the outer tube 200. Thus, the inner cavity of the first tube body 110 of the inner tube 100 serves as a guide wire lumen. The outer diameter of the inner tube 100 is smaller than the inner diameter of the outer tube 200, so that a liquid flow channel 11 is formed between the outer surface of the inner tube 100 and the inner surface of the outer tube 200. The distal end of the inner tube 100 extends out of the distal end of the outer tube 200. The balloon 20 is sleeved on the outer surface of the distal end of the inner tube 100, and the distal end of the balloon 20 is connected to the distal end of the inner tube 100. The proximal end of the balloon 20 is connected to the distal end of the outer tube 200, and the proximal end of the balloon 20 is also communicated with the liquid flow channel 11 to allow a filling agent to enter the balloon 20 from the liquid flow channel 11, for example, and fill the balloon 20.

[0052] During actual operation, a guide wire is pre-imported into the human body along a blood vessel. The balloon catheter is sleeved on the guide wire through the guide wire lumen, so that the balloon catheter can enter the human body along the guide wire and the balloon 20 can reach the target position, and after the treatment is completed, the balloon catheter can be withdrawn from the human body along the guide wire. Since the inner surface of the guide wire lumen is the inner surface of the first tube body 110, its friction coefficient is small. Therefore, during the process of the balloon catheter advancing along the guide wire, the frictional resistance between the two is small, making the movement of the balloon catheter smoother and avoiding the occurrence of blockage phenomena that may prolong the operation time.

[0053] Those skilled in the art should know that the balloon catheter further includes a connector 30, which is connected to the proximal end of the catheter body 10. The connector 30 includes a first joint 31 and a second joint 32. The first joint 31 is communicated with the inner tube 100 (that is, communicated with the first tube body 110) for threading the guide wire. The second joint 32 is communicated with the liquid flow channel 11 and is used to connect to an external syringe to inject a filling agent into the balloon 20. In addition, the balloon catheter further includes a stress diffusion tube 40, which is sleeved on the outer surface of the proximal end of the outer tube 120 and is also connected to the distal end of the connector 30 for diffusing the stress received at the proximal end of the catheter body 10.

[0054] Furthermore, a developing element 50 is also provided on the outer surface of the distal end of the inner tube 100. The number of the developing elements 50 can be two, and they can be respectively arranged corresponding to the proximal end and the distal end of the balloon 20 for determining the position of the balloon 20 in the body. And when the filling agent includes a contrast liquid, the developing element 50 can also be used to observe the contrast effect.

[0055] In addition, a hydrophilic coating (not shown in the figure) is also provided on the outer surface of the distal end of the balloon 20 and the outer tube 200 to reduce the friction between the balloon catheter and the blood vessel wall.

[0056] In summary, the medical tubing provided by the technical solution of the embodiment of the present invention reduces the frictional force generated between the medical tubing and the guide wire when the medical tubing travels along the guide wire by adding a first tube body with a small surface friction coefficient to the inner layer of the metal hypotube, improves the smoothness of the travel of the medical tubing, and avoids the prolongation of the operation time. When the medical tubing is applied to a balloon catheter or other medical devices including a catheter body, only the structure of the medical tubing changes, and the design, production process, sterilization, packaging, etc. of other structures do not change, and the production and processing process of the medical device will not be increased.

[0057] Although the present invention is disclosed as above, it is not limited thereto. Those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims

1. A medical tube, characterized in that, It includes a first tube body, a second tube body and a third tube body. The second tube body is sleeved on the outer surface of the first tube body, and the first tube body and the second tube body are in interference fit. Among them, pores are formed by cutting on the second tube body so that the second tube body is formed into a metal bellows tube. The friction coefficient of the inner surface of the first tube body is smaller than that of the inner surface of the second tube body. The third tube body is sleeved on the outer surface of the second tube body, and the inner surface of the third tube body fits with the outer surface of the second tube body. The material of the first tube body is polytetrafluoroethylene. A weakening structure is provided on the first tube body. The weakening structure is a groove. The groove is arranged on the outer surface of the first tube body, or the groove penetrates through the tube wall of the first tube body. The groove spirally surrounds along the axis of the first tube body to form a spiral structure. The distal ends of the first tube body and the third tube body both protrude from the distal end of the second tube body, and the distal end of the first tube body is connected to the distal end of the third tube body; and / or, the proximal ends of the second tube body and the first tube body both protrude from the proximal end of the third tube body, and the proximal end of the second tube body is connected to the proximal end of the first tube body.

2. The medical tubing according to claim 1, characterized in that, The cross-section of the first tube body is circular or regular polygon.

3. A balloon catheter, characterized in that, It includes a catheter body and a balloon. The catheter body includes an outer tube and an inner tube. The inner tube is the medical tubing according to claim 1 or 2. The inner tube is partially inserted into the outer tube, and a liquid flow channel is formed between the outer surface of the inner tube and the inner surface of the outer tube. The distal end of the inner tube extends out from the distal end of the outer tube. The balloon is sleeved on the outer surface of the distal end of the inner tube, and the distal end of the balloon is connected to the distal end of the inner tube. The proximal end of the balloon is connected to the distal end of the outer tube and is also communicated with the liquid flow channel.

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