Balloon dilatation catheter with binding structure

Abstract

The invention relates to a balloon dilatation catheter with a binding structure. The balloon dilatation catheter comprises the binding structure and a balloon dilatation catheter body (of a rapid exchange type or an OTW type). The balloon dilatation catheter is divided into a balloon and a catheter body. The periphery of the balloon is integrally sleeved with the binding structure, at least one end of the binding structure is fixed to the balloon dilatation catheter body, the binding structure is of a preset shape, particularly a cylindrical structure, and the shape of the balloon in the dilatation state is matched with the preset shape of the binding structure. After the balloon is expanded, the binding structure can effectively bind the external form of the balloon, it is guaranteed that the balloon is expanded according to the preset form of the binding structure, a complete cylindrical form is formed, the dumbbell effect is not generated, and therefore full expansion of the plaque position is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and in particular to a balloon dilatation catheter with a restraining structure. Background Art

[0002] When treating vascular stenosis by interventional means, the balloon dilatation catheter is a commonly used device. A good balloon dilatation catheter must have good ability to pass through stenotic lesions and good recovery performance after dilatation. At the same time, the balloon needs to maintain a complete cylindrical shape during the dilatation process, and not produce a "dumbbell" effect due to the squeezing of intravascular plaques, resulting in the inability to effectively dilate the lesion.

[0003] The commonly used balloon dilatation catheters on the market cannot always maintain a cylindrical state during expansion, or the cylindrical structure is not stable enough. Summary of the invention

[0004] In view of this, the present application proposes a device including a restraining structure and a balloon dilatation catheter; the balloon dilatation catheter is divided into two parts, a balloon and a tube body; the restraining structure is integrally sleeved on the outer circumference of the balloon, and at least one end of the restraining structure is fixed to the tube body, the restraining structure is in a preset shape, specifically a cylindrical structure, and the shape of the balloon in the expanded state matches the preset shape of the restraining structure.

[0005] In one possible implementation, the proximal side of the restraint structure has a first outward conical structure, and the outer diameter of the first conical structure gradually increases from the proximal end to the distal end of the tube body; the distal side of the restraint structure has a second outward conical structure, and the outer diameter of the second conical structure gradually decreases from the proximal end to the distal end of the tube body.

[0006] In a possible implementation manner, the restraint structure is made of a braided structure.

[0007] In a possible implementation, the distal end of the restraint structure is welded to the tube body, or the distal end of the restraint structure is adhesively fixed to the tube body, or the distal end of the restraint structure is riveted to the tube body; the proximal end of the restraint structure is movably connected to the tube body.

[0008] In a possible implementation, it further includes a developing ring; the proximal end of the binding structure is fixedly connected to the developing ring, and the proximal end of the binding structure is slidably connected to the tube body through the developing ring.

[0009] In a possible implementation, the first conical surface structure of the restraining structure extends outwardly with a first mounting section, and the first mounting section is an equal-diameter structure that is adapted to the outer diameter of the tube body; the second conical surface structure of the restraining structure extends outwardly with a second mounting section, and the second mounting section is an equal-diameter structure that is adapted to the outer diameter of the tube body; and the axial length of the first mounting section is slightly longer than the axial length of the second mounting section.

[0010] In a possible implementation manner, a radial length of the first mounting segment is greater than a radial length of the second mounting segment.

[0011] In a possible implementation, the angle between the conical structures at both ends of the restraining structure and the axis of the tube body is less than 30°.

[0012] In a possible implementation, a preset shape of the restraint structure is slightly larger than a shape of the balloon in an expanded state.

[0013] In a possible implementation, the restraining structure is made of memory metal material.

[0014] The beneficial effects of the present application are as follows: by installing a restraining structure of a preset shape at the position where the balloon is set on the tube body, and the restraining structure is located outside the balloon, after the balloon is expanded, the restraining structure can effectively restrain the external shape of the balloon, ensuring that the balloon expands according to the preset shape of the restraining structure, forming a relatively complete cylindrical shape, without producing a dumbbell effect, thereby achieving full expansion of the plaque position. In addition, at least one end of the restraining structure is fixed on the tube body, so that while the restraining structure and the tube body are fixed, the unfixed end can slide on the tube body to a certain extent during transportation, further reducing transportation resistance.

[0015] Other features and aspects of the present application will become apparent from the following detailed description of exemplary embodiments with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate exemplary embodiments, features, and aspects of the present application and, together with the description, serve to explain the principles of the present application.

[0017] Figure 1 A schematic structural diagram of a balloon dilatation catheter with a restraining structure according to an embodiment of the present application is shown;

[0018] Figure 2 A side schematic diagram of a binding structure according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0019] Various exemplary embodiments, features and aspects of the present application will be described in detail below with reference to the accompanying drawings. The same reference numerals in the accompanying drawings represent elements with the same or similar functions. Although various aspects of the embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless otherwise specified.

[0020] Among them, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application or simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0021] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0022] The word “exemplary” is used exclusively herein to mean “serving as an example, example, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.

[0023] In addition, in order to better illustrate the present application, numerous specific details are given in the following specific embodiments. It should be understood by those skilled in the art that the present application can also be implemented without certain specific details. In some examples, methods, means, components and circuits well known to those skilled in the art are not described in detail in order to highlight the subject matter of the present application.

[0024] Figure 1 A schematic structural diagram of a balloon dilatation catheter with a restraining structure according to an embodiment of the present application is shown; Figure 2 A side schematic diagram of a binding structure according to an embodiment of the present application is shown.

[0025] like Figure 1-Figure 2As shown, the balloon dilatation catheter with a restraining structure 10 includes: a restraining structure 10, a balloon dilatation catheter, the balloon dilatation catheter is divided into a tube body 20 and a balloon (not shown in the figure, the balloon is located on the inner side of the restraining structure 20); and the tube body 20, the restraining structure 10 is integrally sleeved on the outer circumference of the balloon, and at least one end of the restraining structure 10 is fixed to the tube body 20, the restraining structure 10 is in a preset shape, specifically a cylindrical structure, and the shape of the balloon in the expanded state matches the preset shape of the restraining structure 10.

[0026] In this embodiment, a restraining structure 10 of a preset shape is installed at the position where the balloon is set in the tube body 20, and the restraining structure 10 is located outside the balloon. After the balloon is expanded, the restraining structure 10 can effectively restrain the external shape of the balloon, ensuring that the balloon expands according to the preset shape of the restraining structure 10, forming a relatively complete cylindrical shape without producing a dumbbell effect, thereby achieving full expansion of the plaque position. In addition, at least one end of the restraining structure 10 is fixed to the tube body 20, so that the restraining structure 10 and the tube body 20 are fixed, and the unfixed end can slide on the tube body 20 to a certain extent during transportation, further reducing transportation resistance.

[0027] It should also be pointed out that the restraint structure 10 can be adapted to a rapid exchange balloon catheter or an OTW balloon catheter. It is only necessary to ensure that the restraint structure 10 is fixedly installed outside the balloon. Therefore, the specific types of balloon catheters that the restraint structure 10 can be adapted to are not described in this article.

[0028] In one specific embodiment, the preset shape of the restraint structure 10 is specifically: a cylindrical structure, and the proximal side of the restraint structure 10 has a first conical structure 11 facing outward, and the outer diameter of the first conical structure 11 gradually increases from the proximal end to the distal end of the tube body 20, and the distal side of the restraint structure 10 has a second conical structure 12 facing outward, and the outer diameter of the second conical structure 12 gradually decreases from the proximal end to the distal end of the tube body 20.

[0029] In one specific embodiment, Figure 1 As shown, the binding structure 10 is in the shape of a date pit as a whole, with the distal and proximal ends protruding outward, namely the first conical structure 11 and the second conical structure 12 referred to in the previous text of the present application, and the middle part is a hollow cylindrical structure.

[0030] In one specific embodiment, the restraint structure 10 is made of a braided structure.

[0031] In one specific embodiment, the distal end of the restraint structure 10 is welded and fixed to the tube body 20, or the distal end of the restraint structure 10 is adhesively fixed to the tube body 20, or the distal end of the restraint structure 10 is riveted and fixed to the tube body 20, and the proximal end of the restraint structure 10 is movably connected to the tube body 20.

[0032] In one specific embodiment, the balloon dilatation catheter with a restraining structure 10 of the present application further includes a developing ring 30 , the proximal end of the restraining structure 10 is fixedly connected to the developing ring 30 , and the proximal end of the restraining structure 10 is slidably connected to the tube body 20 via the developing ring 30 .

[0033] In the above two embodiments, the braided restraint structure 10 can cooperate with the balloon dilatation catheter through the developing ring 30 set at its end to achieve more accurate balloon dilatation surgery. The distal end of the restraint structure 10 can be combined with the developing ring 30 by bonding or welding, and then pressed together or directly bonded to the balloon dilatation catheter. The proximal end of the restraint structure 10 can be combined with the developing ring 30 by bonding or welding, and its proximal developing ring 30 can slide freely on the catheter to solve the problem of inconsistent shortening rates of the braided restraint structure 10 and the balloon dilatation tube body 20.

[0034] In one specific embodiment, the first conical surface structure 11 of the restraining structure 10 extends outwardly with a first mounting section 13, and the first mounting section 13 is an equal-diameter structure that is adapted to the outer diameter of the tube body 20. The second conical surface structure 12 of the restraining structure 10 extends outwardly with a second mounting section 14, and the second mounting section 14 is an equal-diameter structure that is adapted to the outer diameter of the tube body 20, and the axial length of the first mounting section 13 is slightly longer than the axial length of the second mounting section 14.

[0035] In one specific embodiment, the radial length of the first mounting segment 13 is greater than the radial length of the second mounting segment 14, the angle between the conical structures at both ends of the restraint structure 10 and the axis of the tube body 20 is less than 30°, and the preset shape of the restraint structure 10 is slightly larger than the shape of the balloon in the expanded state.

[0036] In one specific embodiment, the binding structure 10 is made of memory metal.

[0037] In this embodiment, the restraining structure 10 with superelasticity and shape memory can automatically return to its original position during the delivery process and after the expansion is completed, thereby reducing the outer diameter of the balloon and further reducing the delivery resistance of the balloon during the delivery process.

[0038] Preferably, nickel-titanium braided wire or cobalt-cadmium braided wire.

[0039] The embodiments of the present application have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A balloon dilatation catheter with a restraining structure, characterized in that: It includes a restraining structure and a balloon dilatation catheter; the balloon dilatation catheter is divided into two parts: a balloon and a tube body; The restraint structure is integrally sleeved on the outer circumference of the balloon, and at least one end of the restraint structure is fixed to the tube body. The restraint structure is in a preset shape, specifically a cylindrical structure, and the shape of the balloon in the expanded state matches the preset shape of the restraint structure.

2. The balloon dilatation catheter with a restraining structure according to claim 1, characterized in that: The proximal side of the restraint structure has a first outward conical structure, and the outer diameter of the first conical structure gradually increases from the proximal end to the distal end of the tube body; the distal side of the restraint structure has a second outward conical structure, and the outer diameter of the second conical structure gradually decreases from the proximal end to the distal end of the tube body.

3. The balloon dilatation catheter with a restraining structure according to claim 1, characterized in that: The restraining structure is made of a braided structure.

4. The balloon dilatation catheter with a restraining structure according to claim 1, characterized in that: The distal end of the restraint structure is fixed to the tube body by welding, or the distal end of the restraint structure is fixed to the tube body by bonding, or the distal end of the restraint structure is fixed to the tube body by riveting; The proximal end of the restraint structure is movably connected to the tube body.

5. The balloon dilatation catheter with a restraining structure according to claim 4, characterized in that: Also included is a developing ring; The proximal end of the binding structure is fixedly connected to the developing ring, and the proximal end of the binding structure is slidably connected to the tube body through the developing ring.

6. The balloon dilatation catheter with a restraining structure according to claim 2, characterized in that: The first conical surface structure of the restraining structure extends outward to form a first installation section, and the first installation section is a constant diameter structure and is adapted to the outer diameter of the tube body; The second conical surface structure of the restraining structure extends outward to form a second installation section, and the second installation section is a constant diameter structure and is adapted to the outer diameter of the tube body.

7. The balloon dilatation catheter with a restraining structure according to any one of claims 1 to 6, characterized in that: The preset shape of the restraining structure is slightly larger than the shape of the balloon in the expanded state.

8. The balloon dilatation catheter with a restraining structure according to any one of claims 1 to 6, characterized in that: The restraining structure is a nickel-titanium alloy.

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