CN119701166A

CN119701166A - Balloon dilation catheter with strapped structure

Info

Publication number: CN119701166A
Application number: CN202311269720.3A
Authority: CN
Inventors: 田强元; 李纪森; 任彬彬; 刘辰洋
Original assignee: Shanghai Li Kai Technology Co ltd
Current assignee: Shanghai Li Kai Technology Co ltd
Priority date: 2023-09-27
Filing date: 2023-09-27
Publication date: 2025-03-28

Abstract

The present application relates to a balloon dilatation catheter with a restraining structure, including: a restraining structure, a balloon dilatation catheter (rapid exchange type or OTW type). 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 of the balloon dilatation catheter. 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. 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, and does not produce a dumbbell effect, thereby achieving full expansion of the plaque position.

Description

Balloon dilation catheter with strapped structure

Technical Field

The application relates to the technical field of medical instruments, in particular to a balloon dilation catheter with a belted structure.

Background

Balloon dilation catheters are a common instrument in the interventional treatment of vascular stenosis. A good balloon dilation catheter is required to have good ability to pass stenotic lesions and good retrieval performance after dilation is complete. Meanwhile, the balloon needs to maintain a complete cylindrical shape in the expanding process, so that a dumbbell effect is not generated due to extrusion of plaque in a blood vessel, and a lesion position cannot be effectively expanded.

At present, when the balloon dilation catheter commonly used in the market is dilated, the balloon dilation catheter cannot always maintain a cylindrical state or maintain the shape of a cylindrical structure to be unstable.

Disclosure of Invention

In view of the above, the application provides a balloon dilation catheter which comprises a binding structure and a balloon dilation catheter, wherein the balloon dilation catheter is divided into two parts, namely a balloon and a tube body, the binding structure is integrally sleeved on the periphery of the balloon, at least one end of the binding structure is fixed on the tube body, the binding structure is in a preset shape, particularly a cylindrical structure, and the shape of the balloon in a dilation state is matched with the preset shape of the binding structure.

In one possible implementation, the proximal side of the constraining structure has a first outwardly tapered surface structure with an outer diameter that gradually increases from the proximal section of the tube to the distal end, and the distal side of the constraining structure has a second outwardly tapered surface structure with an outer diameter that gradually decreases from the proximal section of the tube to the distal end.

In one possible implementation, the tethering structure is made of a woven structure.

In one possible implementation manner, the distal end of the constraint structure is welded and fixed with the pipe body, or the distal end of the constraint structure is bonded and fixed with the pipe body, or the distal end of the constraint structure is riveted and fixed to the pipe body, and the proximal end of the constraint structure is movably connected with the pipe body.

In one possible implementation, the device further comprises a developing ring, wherein the proximal end of the binding structure is fixedly connected with the developing ring, and the proximal end of the binding structure is in sliding connection with the tube body through the developing ring.

In one possible implementation manner, the first conical surface structure of the constraint structure is outwards extended to form a first installation section, the first installation section is of an equal-diameter structure and is matched with the outer diameter of the pipe body, the second conical surface structure of the constraint structure is outwards extended to form a second installation section, the second installation section is of an equal-diameter structure and is matched with the outer diameter of the pipe body, and the axial length of the first installation section is slightly longer than that of the second installation section.

In one possible implementation, the radial length of the first mounting section is greater than the radial length of the second mounting section.

In one possible implementation, the angle between the conical surface structures at the two ends of the constraint structure and the axis of the pipe body is smaller than 30 °.

In one possible implementation, the preset shape of the constraining structure is slightly larger than the shape of the balloon in the expanded state.

In one possible implementation, the constraining structure is a memory metal material.

The balloon stent has the beneficial effects that the constraint structure with the preset shape is arranged at the position of the balloon arranged on the tube body, and is positioned at the outer side of the balloon, after the balloon is expanded, the constraint structure can effectively constraint the external form of the balloon, so that the balloon is ensured to expand according to the preset form of the constraint structure to form a more complete cylindrical form, and the dumbbell effect is not generated, so that the plaque position is fully expanded. Moreover, at least one end of the binding structure is fixed on the pipe body, so that the fixed end of the binding structure and the pipe body can slide on the pipe body to a certain extent during conveying, and conveying resistance is further reduced.

Other features and aspects of the present application will become apparent from the following detailed description of exemplary embodiments, which proceeds with reference to the accompanying drawings.

Drawings

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

FIG. 1 shows a schematic structural view of a balloon dilation catheter of a belted structure according to an embodiment of the present application;

fig. 2 shows a schematic side view of a tethering structure in accordance with an embodiment of the present application.

Detailed Description

Various exemplary embodiments, features and aspects of the application will be described in detail below with reference to the drawings. In the drawings, like reference numbers indicate identical or functionally similar elements. Although various aspects of the embodiments are illustrated in the accompanying drawings, the drawings are not necessarily drawn to scale unless specifically indicated.

It should be understood, however, that the terms "center," "longitudinal," "transverse," "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counter-clockwise," "axial," "radial," "circumferential," and the like indicate or are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of describing the application or simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the application.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

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

In addition, numerous specific details are set forth in the following description in order to provide a better illustration of the application. It will be understood by those skilled in the art that the present application may be practiced without some of these specific details. In some instances, well known methods, procedures, components, and circuits have not been described in detail so as not to obscure the present application.

Fig. 1 shows a schematic structural view of a balloon dilation catheter of a belted structure according to an embodiment of the application, and fig. 2 shows a schematic side view of a tethered structure according to an embodiment of the application.

As shown in fig. 1-2, the balloon dilation catheter of the belted structure 10 comprises a constraint structure 10 and a balloon dilation catheter, wherein the balloon dilation catheter is divided into a tube body 20 and a balloon (shielding is not shown in the figure, the balloon is positioned on the inner side of the constraint structure 20), the tube body 20 is integrally sleeved on the periphery of the balloon, at least one end of the constraint structure 10 is fixed on the tube body 20, the constraint structure 10 is in a preset shape, particularly a cylindrical structure, and the shape of the balloon in an expanded state is matched with the preset shape of the constraint structure 10.

In this embodiment, the constraining structure 10 with a preset shape is installed at the position where the balloon is arranged on the tube body 20, and the constraining structure 10 is located at the outer side of the balloon, after the balloon is expanded, the constraining structure 10 can effectively constrain the external form of the balloon, so that the balloon is ensured to expand according to the preset form of the constraining structure 10, a relatively complete cylindrical form is formed, dumbbell effect is not generated, and therefore, the plaque position is fully expanded. Furthermore, at least one end of the restraint structure 10 is fixed on the pipe body 20, so that the unfixed end can slide on the pipe body 20 to a certain extent during conveying while the restraint structure 10 and the pipe body 20 are fixed, and conveying resistance is further reduced.

It should be further noted that the constraining structure 10 may be adapted to a rapid exchange balloon catheter, or may be adapted to an OTW balloon catheter, and only the constraining structure 10 needs to be fixedly installed outside the balloon, so that details of the type of balloon catheter to which the constraining structure 10 can be adapted are not described herein.

In one embodiment, the constraint structure 10 has a preset shape, specifically, a cylindrical structure, and the proximal side of the constraint structure 10 has a first tapered surface structure 11 facing outward, the outer diameter of the first tapered surface structure 11 gradually increases from the proximal section of the tube body 20 to the distal end, the distal side of the constraint structure 10 has a second tapered surface structure 12 facing outward, and the outer diameter of the second tapered surface structure 12 gradually decreases from the proximal section of the tube body 20 to the distal end.

In one embodiment, as shown in fig. 1, the binding structure 10 is in a shape of a jujube core, and the distal and proximal ends are protruded outwards, that is, the first conical surface structure 11 and the second conical surface structure 12 referred to above in the present application, and the middle part is in a hollow cylinder structure.

In one embodiment, the tethering structure 10 is made of a woven structure.

In one embodiment, the distal end of the restraint structure 10 is welded to the tube 20, or the distal end of the restraint structure 10 is adhesively secured to the tube 20, or the distal end of the restraint structure 10 is riveted to the tube 20, and the proximal end of the restraint structure 10 is movably connected to the tube 20.

In one embodiment, the balloon dilation catheter of the present harness structure 10 further includes a visualization ring 30, the proximal end of the harness structure 10 being fixedly connected to the visualization ring 30, the proximal end of the harness structure 10 being slidably connected to the tube 20 via the visualization ring 30.

In both embodiments, the braided tethering structure 10 may be mated with a balloon dilation catheter through a visualization ring 30 provided at an end thereof to enable more precise balloon dilation procedures. The distal end of the constraining structure 10 may be bonded to the visualization ring 30 by bonding, welding, and then crimping or bonding directly to the balloon dilation catheter. The proximal end of the constraining structure 10 may be bonded, welded, and attached to the developing ring 30, and the proximal developing ring 30 may slide freely over the catheter to solve the problem of inconsistent shrinkage of the braided constraining structure 10 and the balloon dilation tube 20.

In one embodiment, the first conical surface structure 11 of the constraint structure 10 extends outwards to form a first mounting section 13, the first mounting section 13 is of an equal diameter structure and is matched with the outer diameter of the pipe body 20, the second conical surface structure 12 of the constraint structure 10 extends outwards to form a second mounting section 14, the second mounting section 14 is of an equal diameter structure and is matched with the outer diameter of the pipe body 20, and the axial length of the first mounting section 13 is slightly longer than that of the second mounting section 14.

In one embodiment, the radial length of the first mounting section 13 is greater than that of the second mounting section 14, the angle between the conical surface structures at the two ends of the constraint structure 10 and the axis of the tube 20 is less than 30 °, and the preset shape of the constraint structure 10 is slightly greater than that of the balloon in the expanded state.

In one embodiment, the restraint structure 10 is a memory metal material.

In this embodiment, the constraining structure 10 having superelasticity and shape memory may return automatically after delivery and expansion is completed, thereby reducing the balloon outer diameter and thus the balloon delivery resistance during delivery.

Preferably, nickel titanium braided wires or cobalt cadmium braided wires.

The foregoing description of embodiments of the application has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described. The terminology used herein was chosen in order to best explain the principles of the embodiments, the practical application, or the improvement of technology in the marketplace, or to enable others 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 comprises 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 is characterized in that the proximal side of the restraining structure has a first conical structure facing outward, 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 restraining structure has a second conical structure facing outward, 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 restraining structure is fixed to the tube body by welding, or the distal end of the restraining structure is fixed to the tube body by bonding, or the distal end of the restraining 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 it also 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.

6. The balloon dilatation catheter with a restraining structure according to claim 2, characterized in that the first conical structure of the restraining structure extends outwardly to form a first mounting section, and the first mounting section is an equal-diameter structure 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 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 a preset shape of the restraining structure is slightly larger than a shape of the balloon in an 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 made of nickel-titanium alloy.