CN116058912A

CN116058912A - Braided catheter

Info

Publication number: CN116058912A
Application number: CN202211538667.8A
Authority: CN
Inventors: 付诗; 张宁; 张淼; 刘辰洋
Original assignee: Shanghai Li Kai Technology Co ltd
Current assignee: Shanghai Li Kai Technology Co ltd
Priority date: 2022-12-02
Filing date: 2022-12-02
Publication date: 2023-05-05

Abstract

The present application relates to a braided catheter comprising: the structure body is a woven structure, the outer surface of the structure body is coated with the protective layer, the structure body is a hollow cylinder structure which is formed by interweaving two or more woven strands arranged along a first direction and two or more woven strands arranged along a second direction, the woven strands in at least one direction are woven wires which are twisted with each other clockwise or anticlockwise to form a twisting structure, and the protective layer is made of high polymer materials. The braided wire strand structure formed by clockwise or anticlockwise twisting wires improves the overall flexibility of the catheter, has better lumen collapse resistance, and is sleeved with the protective layer, so that the braided structure is restrained and stabilized. The structure is loose can not take place when establishing the passageway in the art, and its constraint to braided structure tip can avoid vascular damage simultaneously, and the difficult deformation of appearing of the braided catheter of protection this application, fracture scheduling problem.

Description

Braided catheter

Technical Field

The application relates to the technical field of medical instruments, in particular to a braided catheter.

Background

Intracranial acute embolism is a common condition of ischemic cerebral apoplexy, and aspiration and thrombolysis are common means for treating intravascular acute thrombosis. In the process of using the catheter to extract thrombus, the catheter not only needs to have better super-selection positioning capability, but also needs to have stronger lumen deformation resistance so as to avoid the problem that the catheter deforms and the inner cavity collapses when the embolus is difficult to take out and negative pressure suction is required to be increased.

Therefore, there is a need for a suction catheter that is both compliant and resistant to deformation in the clinic.

Disclosure of Invention

In view of this, the present application proposes a braided catheter comprising a structural body and a protective layer; the structure main body is of a woven structure, and the protective layer is coated on the outer surface of the structure main body; the structure body is a hollow cylinder structure which is formed by interweaving two or more braiding strands arranged along a first direction and two or more braiding strands arranged along a second direction; wherein the braided strands in a first direction are first strands and the braided strands in a second direction are second strands; at least one direction of the braided wire strands are formed by twisting more than two braided wires clockwise or anticlockwise to form a wire twisting structure; the protective layer is made of a high polymer material.

In one possible implementation, the structural body is welded to the protective layer.

In one possible implementation manner, the braided wires in the first wire strand are twisted with each other clockwise or anticlockwise to form the twisting structure; the braided wires in the second wire strand are twisted with each other clockwise or anticlockwise to form the wire twisting structure.

In one possible implementation manner, the braided wires in the first wire strand are twisted with each other clockwise or anticlockwise to form a twisting structure; the braided filaments in the second strand are arranged linearly.

In one possible implementation, the structural body includes an equal diameter section and a variable diameter section; the large diameter end of the reducing section is connected with the equal diameter section, and the small diameter end of the reducing section is positioned at one end of the structural main body.

In one possible implementation manner, the reducing structure is a multi-section reducing structure, the size of the reducing structure gradually increases from the end part to the middle part of the structural main body, and the reducing section and the equal-diameter section are coaxially arranged.

In one possible implementation manner, the ratio of the diameter of the small diameter end of the reducing section to the diameter of the large diameter end of the reducing section is greater than or equal to 1:2.

in one possible implementation, the first strands intersect the second strands at regular intervals, the first strands intersecting the second strands to form intersections; wherein the crossing points of two adjacent or alternate second strands and the same first strand are positioned on the opposite side of the first strand.

In one possible implementation manner, the material of the protective layer is thermoplastic polyurethane elastomer material, silica gel material or nylon material; the braided wires are made of DFT developing materials containing platinum Jin Naxin.

In another aspect, the present application provides a method for preparing a braided catheter, for preparing a braided catheter according to any one of the above aspects, comprising the steps of: heat setting the braided structure to form the structural body; and assembling the protective layer on the outer side of the structural main body. And assembling the protective layer on the outer surface of the formed structural main body, and mutually fixing the structural main body and the protective layer through reflow soldering.

The beneficial effects of this application: through weaving the silk strand interweaving that sets up in first direction and second direction, the structure main part is made to the silk strand that weaves that just at least one direction is that two above braided wire twist the silk clockwise or anticlockwise and constitute, and this is along the braided wire strand structure that clockwise or anticlockwise twisted the silk and is, compares the structure main part that makes according to conventional mode through single braided wire, and holistic compliance of pipe of this application obtains promoting, possesses the ability of preferred lumen subsidence simultaneously, at the protective layer of its cover setting, plays the constraint effect to the braided structure to stabilize the braided structure. The structure is loose can not take place when establishing the passageway in the art, and its constraint to braided structure tip can avoid vascular damage simultaneously, and the difficult deformation of appearing of the braided catheter of protection this application, fracture scheduling problem.

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 present application and together with the description, serve to explain the principles of the present application.

FIG. 1 illustrates a half-section view of a braided catheter of an embodiment of the present application;

FIG. 2 shows a schematic cross-sectional view of a braided catheter of an embodiment of the present application;

FIG. 3 shows a schematic structural view of a strand of braided filaments according to an embodiment of the present application;

FIG. 4 shows a partial schematic view of a braided strand interweaving in accordance with an embodiment of the present application;

FIG. 5 shows a partial schematic view of a braided strand interlacing of another embodiment of the present application;

FIG. 6 shows an enlarged view of a portion of a threading structure of an embodiment of the present application;

FIG. 7 shows a partial schematic view of a braided strand interlacing of another embodiment of the present application;

FIG. 8 shows a schematic side view of a structural body with a reducing structure according to an embodiment of the present application;

fig. 9 shows a schematic side view of a structural body with a reducing structure according to another embodiment of the present application.

Detailed Description

Various exemplary embodiments, features and aspects of the present application will be described in detail below with reference to the accompanying 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 description or to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and therefore should not be construed as limiting the present 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 detailed description in order to provide a better understanding of the present 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, methods, means, elements, and circuits have not been described in detail as not to unnecessarily obscure the present application.

FIG. 1 illustrates a half-section view of a braided catheter of an embodiment of the present application; FIG. 2 shows a schematic cross-sectional view of a braided catheter of an embodiment of the present application; FIG. 3 shows a schematic structural view of a strand of braided filaments according to an embodiment of the present application; FIG. 4 shows a partial schematic view of a braided strand interweaving in accordance with an embodiment of the present application; FIG. 5 shows a partial schematic view of a braided strand interlacing of another embodiment of the present application; FIG. 6 shows an enlarged view of a portion of a threading structure of an embodiment of the present application; FIG. 7 shows a partial schematic view of a braided strand interlacing of another embodiment of the present application;

FIG. 8 shows a schematic side view of a structural body with a reducing structure according to an embodiment of the present application; fig. 9 shows a schematic side view of a structural body with a reducing structure according to another embodiment of the present application.

As shown in fig. 1-9, the braided catheter includes: the structure body 10 and the protection layer 20, the structure body 10 is a woven structure, the protection layer 20 is coated on the outer surface of the structure body 10, the structure body 10 is a hollow cylinder structure which is formed by interweaving two or more woven strands 100 arranged along a first direction and two or more woven strands 100 arranged along a second direction, wherein the woven strands 100 arranged along the first direction are first strands 110, the woven strands 100 arranged along the second direction are second strands 120, at least one woven strand 100 is formed by twisting more than two woven wires 101 clockwise or anticlockwise to form a twisting structure 200, and the protection layer 20 is made of a high polymer material.

In this embodiment, the braided wire strands 100 arranged in the first direction and the second direction are interwoven to form the structural body 10, and the braided wire strands 100 in at least one direction are formed by twisting more than two braided wires 101 clockwise or anticlockwise, so that the braided wire strand 100 structure formed by twisting the wires clockwise or anticlockwise has improved flexibility compared with the structural body 10 prepared by a single braided wire 101 in a conventional manner, and meanwhile, the structural body 10 has better lumen collapse resistance capability, and the protective layer 20 sleeved on the structural body has a binding effect on the braided structure and stabilizes the braided structure. The loose structure can not take place when establishing the passageway in the art, and its constraint of structure main part 10 tip can avoid vascular damage simultaneously, protects the difficult deformation of appearing of the braided catheter of this application, the fracture scheduling problem. ,

in short, the plurality of braided wires 101 in the same direction are twisted with each other, that is, twisted to some extent to form one braided wire strand 100, and then interweaved with the braided wire strand 100 in the other direction to form the structural body 10.

In one embodiment, the structural body 10 is welded to the protective layer 20.

In one embodiment, the braided filaments 101 in the first strand 110 are twisted with each other clockwise or counterclockwise to form the twisting structure 200, and the braided filaments 101 in the second strand 120 are twisted with each other clockwise or counterclockwise to form the twisting structure 200.

By this embodiment, it can be understood that: the twisting directions of the first strands 110 and the second strands 120 are generally divided into three types:

1. the total braided filaments 101 of the first strand 110 are twisted with each other clockwise, and the braided filaments 101 of the second braided strand 100120 are twisted with each other clockwise.

2. The total braided filaments 101 of the first strand 110 are twisted with each other clockwise, and the braided filaments 101 of the second braided strand 100120 are twisted with each other counterclockwise.

3. Or the total braided filaments 101 of the first strand 110 are twisted with each other in a counterclockwise direction, and the braided filaments 101 in the second braided strand 100120 are twisted with each other in a counterclockwise direction.

To first silk strand 110 twist silk each other clockwise, second silk strand 120 twist silk each other anticlockwise, can ensure that the whole braided catheter of this application possesses the symmetry, and the structure is more stable, when taking out the embolus and need increase negative pressure suction, this symmetrical structure makes the structure main part 10 of twisting the silk have better anti-deformation ability, when taking into account stronger locating capability, can obtain better suction effect.

More specifically, the shape of the single first strand 110 or the single second strand 120 in the whole stent is similar to a spring structure, and this shape characteristic provides enough flexibility for the structural body 10, in the scheme of the present application, on this basis, by twisting more than two braided wires 101 clockwise or anticlockwise, the shape of the single braided strand 100 is also a spring structure, and several braided wires 101 in the same direction are twisted with each other, that is, after being twisted to a certain extent, are interwoven with braided wires 101 in another direction to form a braided structure, and this "spring winding spring" manner not only can improve the flexibility of the catheter, but also increases the rigidity of the braided strand 100, thereby improving the lumen collapse resistance of the catheter.

In one embodiment, the braided filaments 101 in the first strand 110 are twisted with each other clockwise or counterclockwise to form a twisted wire structure 200, and the braided filaments 101 in the second strand 120 are arranged linearly.

In this embodiment, the plurality of braided wires 101 in the braided wire strand 100 in the first direction are twisted clockwise or counterclockwise to form the twisted wire structure 200, the braided wires 101 in the second direction are not twisted, and are linearly arranged, so that the structural body 10 is formed, and the compliance of the structural body 10 is not as good as that of the structural body 10 twisted clockwise in the first direction and twisted counterclockwise in the second direction, so that the compliance and the lumen collapse resistance of the structural body 10 are in a moderate range.

More specifically, as shown in fig. 6, the braided wire strands 100 in one direction in the stent are not twisted, the braided wire strands 100 in the other direction are twisted, the number of braided wire strands 100 in the structural body 10 is 2, the number of times of twisting the braided wire strands 100 in one direction is 2, and the number of times of twisting the braided wire strands 100 in the other direction is 0.

In one embodiment, the structural body 10 includes a constant diameter section 12 and a variable diameter section 11, the large diameter end of the variable diameter section 11 is connected with the constant diameter section 12, the small diameter end of the variable diameter section 11 is located at one end of the structural body 10, and the variable diameter section 11 and the constant diameter section 12 are coaxially arranged.

In one embodiment, the reducing structure 13 is a multi-stage reducing structure, and the size of the reducing structure 13 increases gradually from the end to the middle of the structural body 10.

In this embodiment, the multi-stage reducing diameter structure 13 is gradually enlarged from one end of the structural body 10 to the other end, and the braided catheter with the reducing diameter structure 13 has a smaller diameter end which is easier to enter the delivery catheter, so that the braided catheter of the present application can be used in surgery by those skilled in the art.

In one embodiment, the ratio of the diameter of the small diameter end of the variable diameter section 11 to the diameter of the large diameter end of the variable diameter section 11 is 1 or more: 2.

in one embodiment, the first strands 110 are regularly intersecting the second strands 120 at equal intervals, the first strands 110 intersecting the second strands 120 to form intersections, wherein the intersection of two adjacent or alternating second strands 120 with the same first strand 110 is on the opposite side of the first strand 110.

As shown in fig. 4, in this embodiment, the braiding structure of the structural body 10 includes a common regular structure, where the intersecting points 201 of two adjacent second strands 120 and the same first strand 110 are located on opposite sides of the first strand 110, and the opposite sides referred to herein are understood as two adjacent intersecting points 201 on the same first strand 110, where one intersecting point 201 overlaps the inner side of the first strand 110, and the other intersecting point overlaps the outer side of the first strand 110, that is, the braided strands 100 in different directions are interwoven with each other in a "1-to-1" rule, the number of braided strands 100 in the same direction is 2, and the number of twisting times of the braided strands 100 and the braided strands 100 is 2.

In one embodiment, as shown in fig. 5, the first strands 110 and the second strands 120 are regularly crossed at equal intervals, the first strands 110 and the second strands 120 intersect to form an intersection 201, wherein the intersection 201 of two second strands 120 located in between and the same first strand 110 is located on the opposite side of the first strand 110.

In this embodiment, it should be construed that the term "spaced" as used herein means two second strands 120 disposed at a distance from each other, that is, two second strands 120 disposed at a distance from one second strand 120, one of the two second strands 120 being located at the inner side of the first strand 110 and the other being located at the outer side of the first strand 110, at points where the two second strands 120 intersect with the first strand 110.

As shown in fig. 7, in this embodiment, the braiding structure of the structural body 10 includes a common regular structure, and the above-mentioned "1-press 1" is the same, in this embodiment, the braided strands 100 in different directions are interwoven with each other in the "2-press 2" rule, the number of braided strands 100 in the same direction is 2, and the number of twisting times of the braided strands 100 and the braided strands 100 is 2.

In one embodiment, the material of the protective layer 20 is a thermoplastic polyurethane elastomer material, a silicone material or a nylon material, and the material of the braided wire 101 is a DFT (drawn filled tube) developing material containing platinum Jin Naxin, i.e. a braided wire containing platinum core nickel titanium material.

In another aspect, the present application provides a method for preparing a braided catheter, for preparing a braided catheter according to any one of the embodiments above, comprising the steps of: and (3) performing heat setting on the woven structure to obtain a structural main body 10, assembling a protective layer 20 on the outer surface of the structural main body 10 after setting, and mutually fixing the structural main body 10 and the protective layer 20 through reflow soldering.

More specifically, with respect to the structural body 10 having the reducing structure 13, the protective layer 20 does not require an advanced reducing process. The reducing level of the structural body 10 is a step-by-step reducing, and then the protective layer 20 is sleeved outside the structural body 10, and the protective layer 20 is uniformly attached to the outer surface of the structural body 10 by means of reflow soldering, so that the radial wall thickness of the protective layer 20 is always kept uniform, and the structural body 10 is protected.

The embodiments of the present application have been described above, the foregoing description is exemplary, not exhaustive, and not 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 braided catheter, comprising a structural body and a protective layer;

the structure main body is of a woven structure;

the protective layer is coated on the outer surface of the structural main body;

the structure body is a hollow cylinder structure which is formed by interweaving two or more braiding strands arranged along a first direction and two or more braiding strands arranged along a second direction;

wherein the braided strands in a first direction are first strands and the braided strands in a second direction are second strands;

at least one direction of the braided wire strands are formed by twisting more than two braided wires clockwise or anticlockwise to form a wire twisting structure;

the protective layer is made of a high polymer material.

2. The braided catheter of claim 1, wherein the structural body is welded to the protective layer.

3. The braided catheter of claim 1, wherein the braided filaments in the first strand are twisted with each other in a clockwise or counterclockwise direction to form the twisted wire structure;

the braided wires in the second wire strand are twisted with each other clockwise or anticlockwise to form the wire twisting structure.

4. The braided catheter of claim 1, wherein the braided filaments in the first strand are twisted with each other in a clockwise or counterclockwise direction to form a twisted structure;

the braided filaments in the second strand are arranged linearly.

5. The braided catheter of claim 1, wherein the first strands intersect the second strands at regular intervals, the first strands intersecting the second strands to form intersections;

wherein the crossing points of two adjacent or alternate second strands and the same first strand are positioned on the opposite side of the first strand.

6. The braided catheter of any one of claims 1-5, wherein the structural body includes an isodiametric segment and a variable diameter segment;

the big footpath end of reducing section with the constant diameter section is connected, the small diameter end of reducing section is located the one end of structure main part, just the constant diameter section with the coaxial setting of reducing section.

7. The braided catheter of claim 6, wherein the structural body has a variable diameter structure thereon, the variable diameter structure being a multi-segment variable diameter, the variable diameter structure increasing in size from an end portion to a central portion of the structural body.

8. The braided catheter of claim 6, wherein a ratio of a minor diameter end diameter of the reduced diameter segment to a major diameter end diameter of the reduced diameter segment is 1 or greater: 2.

9. the woven catheter of any one of claims 1-5, wherein the protective layer is made of polyurethane, silicone or nylon;

the braided wires are made of DFT developing materials containing platinum Jin Naxin.

10. A method of making a braided catheter, for use in making a braided catheter according to any one of claims 1-9, comprising the steps of:

heat setting the braided structure to form the structural body;

and assembling the protective layer on the outer side of the structural main body.

And assembling the protective layer on the outer surface of the formed structural main body, and mutually fixing the structural main body and the protective layer through reflow soldering.