CN114191141A

CN114191141A - Aortic arch support

Info

Publication number: CN114191141A
Application number: CN202111609122.7A
Authority: CN
Inventors: 蒋磊; 高廷朝; 李顺启
Original assignee: Henan Provincial Chest Hospital
Current assignee: Henan Provincial Chest Hospital
Priority date: 2021-12-27
Filing date: 2021-12-27
Publication date: 2022-03-18

Abstract

The invention discloses an aortic arch support, which comprises a main body part, a flange part, a coating film, a support rod and an elastic rod, wherein the main body part is provided with a flange part; the main body part is positioned in the middle of the bracket, the two ends of the main body part are provided with flange parts, the diameters of the flange parts are larger than that of the main body part, the main body part and the flange parts at the two ends are all formed by connecting wavy rings made of single metal wires, and the wavy rings of the main body part and the flange parts are mutually fixed by adopting a film; the main body part is provided with at least one window, two supporting rods extending along the axis of the aortic arch support are arranged on two sides of the window, the rigidity of the supporting rods is greater than that of the waveform ring, and an elastic rod is arranged on the opposite side of the two supporting rods; through the matching use of the two support rods and the elastic rod, the bracket can have better support performance and can be suitable for the shape of an aortic arch; because the welding point of the supporting rod and the waveform ring is positioned on the wave crest or the wave trough, the compression and the expansion of the bracket are not influenced.

Description

Aortic arch support

Technical Field

The application relates to an aortic arch support, in particular to a support which can be conveniently placed and stably supported on an aortic arch.

Background

At present, widely used aortic arch support mainly has two kinds on the market, one is the support that adopts the tubular metal resonator to cut and form, this kind of support has stronger support performance, when placing on the aortic arch, because the intensity of self is higher, can resist the impact of the high-speed blood flow of artery, stable support is on the aortic arch, but when carrying, its compression performance is relatively poor, be difficult to draw in order to place in the delivery catheter, in addition, if excessive compression, when carrying the operation position, its condition that expandes the failure takes place occasionally. One of the two types of the widely used stents is formed by weaving a plurality of metal wires, so that the stent has stronger supporting performance and compressibility, but the problem of windowing on the stent is difficult, and the operation time is prolonged; and secondly, the single metal wire forms a waveform ring, and the waveform ring is fixed by adopting a film covering, so that the stent has good compressibility and is easy to convey and expand, but has poor supporting performance and can be displaced under the impact of blood flow.

Disclosure of Invention

The technical scheme of this application aims at solving the technical problem among the prior art, provides one kind and can have better support performance, easily carries simultaneously, places, the aortic arch support of windowing.

The specific scheme is that the aortic arch support comprises a main body part, a flange part, a coating film, a support rod and an elastic rod; the main body part is positioned in the middle of the bracket, the two ends of the main body part are provided with flange parts, the diameters of the flange parts are larger than that of the main body part, the main body part and the flange parts at the two ends are all formed by connecting wavy rings made of single metal wires, and the wavy rings of the main body part and the flange parts are mutually fixed by adopting a film; the main body part is provided with at least one window, two supporting rods extending along the axis of the aortic arch support are arranged on two sides of the window, the rigidity of the supporting rods is greater than that of the wavy ring, and an elastic rod is arranged on the opposite side of the two supporting rods.

In a preferred embodiment, the covering membrane is made of a biocompatible polymer material.

In a preferred embodiment, the material of the coating is polytetrafluoroethylene.

In a preferred embodiment, the two support rods are parallel to each other, and an angle between the two support rods in the circumferential direction of the main body portion is less than 120 degrees and greater than 60 degrees.

In a preferred embodiment, the circumferential angle between the two support bars is 90 degrees.

In a preferred embodiment, the welding points between the two support rods and the corrugated ring are located on the wave crests or the wave troughs.

In a preferred embodiment, the two support rods and the wave-shaped ring are made of the same material.

In a preferred embodiment, the diameter of the support rods is greater than the diameter of the undulating rings.

In a preferred embodiment, the covering film is fixed on the wavy ring by spraying, hot melting, bonding or sewing.

In a preferred embodiment, the covering film is sewn to the wavy annular body by means of a sewing thread, and the sewing points are located on the same circumference for the same wavy annular body.

In the technical scheme, the support has better supporting performance and can be suitable for the shape of an aortic arch by matching two supporting rods and one elastic rod; because the welding points of the supporting rod and the waveform ring are positioned on the wave crest or the wave trough, the compression and the expansion of the bracket are not influenced; meanwhile, the connection points of the covering film and the wavy ring are positioned on the same circumference, so that the compressibility and the expansion performance of the stent are further improved. The elastic polymer arranged on the covering film can enable the covering film to be stretched tightly during unfolding, and the formation of thrombus is reduced.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings needed to be used in the embodiments of the present disclosure will be briefly described below, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic view of a main body and a support bar according to the present invention.

Fig. 2 is a schematic view of the resilient lever of the present invention.

FIG. 3 is a schematic representation of a stitch point of the present invention.

Detailed Description

Features and exemplary embodiments of various aspects of the present disclosure will be described in detail below, and in order to make objects, technical solutions and advantages of the present disclosure more apparent, the present disclosure will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are intended to be illustrative only and are not intended to be limiting of the disclosure. It will be apparent to one skilled in the art that the present disclosure may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present disclosure by illustrating examples of the present disclosure.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

As shown in fig. 1, the aortic arch stent of the present invention comprises a main body 1, flange portions 2, a coating 3, a support rod 4, and an elastic rod 5, wherein the main body 1 is located at the middle position of the stent, the flange portions 2 are arranged at the two ends of the main body 1, the diameter of the flange portions 2 is larger than that of the main body, the main body 1 and the flange portions 2 at the two ends are corrugated rings 6 made of a single metal wire, the coating 3 is used for fixing the corrugated rings 6 of the main body 1 and the flange portions 2 to each other, the coating 3 can be used for fixing the corrugated rings 6 of the main body 1 and the flange portions 2 by spraying, hot melting, and bonding, preferably, the corrugated rings 6 of the main body 1 and the flange portions 2 are sewn on the coating 3 by using suture lines.

The difference from the existing bracket used in the market is that in order to improve the supporting performance of the bracket, two supporting rods 4 are arranged on the bracket, the two supporting rods 4 are in a metal wire structure, the rigidity of the two supporting rods 4 is greater than that of the wavy ring, preferably, the wavy ring 6 of the main body part 1 and the flange part 2 and the supporting rods 4 are made of metal of the same material, and the diameter of the supporting rods 4 is predicted to be greater than that of the wavy ring 6 and welded on the wavy ring 6. The distance between two bracing pieces 4 guarantees that there can be sufficient space between them and sets up the windowing to place the support lateral branch, can accomplish the windowing rapidly between two bracing pieces 4 when the support need be placed to brachiocephalic trunk, left common carotid artery and left subclavian artery, can set up the distance between the wave ring 6 of main part 1 a little more in order to realize this purpose, or the diameter of the wave ring 6 of main part 1 is less than the diameter of the wave ring 6 of flange portion 2.

The two support rods 4 are parallel to each other, and the angle between the circumferential directions of the holder main body portion 1 is less than 120 degrees and more than 60 degrees, preferably 90 degrees. Because two bracing pieces 4 have been set up, it has promoted the stability of support, especially when being provided with the support side branch, two bracing pieces 4 set up the both sides at the support side branch for the support has generally avoided the support performance loss because the windowing brings.

Because the aortic arch stent needs to be in an arch shape during expansion so as to conform to the shape of the aortic arch, after the two support rods 4 are arranged, the outer side of the arch, namely one side corresponding to the brachiocephalic trunk, the left common carotid artery and the left subclavian artery, has better support performance, but the arch shape is affected during expansion, so that the stent tends to be in a linear shape on the whole and cannot be adapted to the shape of the aortic arch, as shown in the attached drawing 2, an elastic rod 5 is arranged on the inner side of the arch, namely the opposite side of the brachiocephalic trunk, the left common carotid artery and the left subclavian artery, and the elastic rod 5 has certain elasticity and resists the stress brought by the support rods 4, so that the stent can conform to the shape of the aortic arch. In the same circumferential direction, the connection points of the elastic rod 5, the two support rods 4 and the waveform ring 6 form an isosceles triangle, so that the whole stress of the bracket is more balanced. Preferably, the angle between the elastic rod 5 and the support rod 4 is 135 degrees in the same circumferential direction.

The elastic rod 5 may be made of a super-elastic metal wire, and it is preferable that the elastic rod 5 is made of a spring wire made of the same material as the stent body in consideration of the overall performance of the stent, and the elastic rod 5 or the spring wire is welded to the corrugated rings 6. The spring wire is heat-set into an arch shape during manufacturing, so that the inner side shape of the aortic arch of a patient is sequentially formed after the spring wire is implanted into a human body, the bracket is completely attached to the inner side of the aortic arch, and stress caused by rigidity of the support rod 4 is offset.

Because two support rods 4 and an elastic rod 5 are arranged in the longitudinal direction of the bracket, the compression performance and the expansion performance of the bracket can be influenced to a certain extent, in order to reduce the influence on compression and expansion as much as possible, the two support rods 4 are welded at the wave crest or the wave trough of the wave-shaped ring 6, namely, the welding point of each support rod 4 and the wave-shaped ring 6 is the wave crest or the wave trough, and the positions of the wave crest or the wave trough are basically fixed, so that the welding point of each support rod 4 moves slightly when the bracket is compressed or expanded, and the influence on the bracket is small.

In addition, as shown in fig. 3, when the wavy rings 6 are sutured on the covering membrane, the suture points 7 are located on the same circumference for the same wavy ring, so that the wavy rings are uniformly stressed, when the stent is contracted, the closed position of each wavy ring 6 can be ensured to form a ring, and when the stent is expanded, each ring is simultaneously and radially expanded.

The material of the covering membrane 3 is a biocompatible polymer, preferably polytetrafluoroethylene, and the reason for using the polymer is that the material property is stable, and considering that polytetrafluoroethylene has no good elasticity, if the model of the stent is matched with the diameter of the aortic arch of a patient with an error, the wavy ring 6 does not completely unfold the covering membrane, a certain gap is formed between the covering membrane 3 and the vessel wall of the aortic arch, and thrombus is easily caused. In order to avoid the occurrence of such phenomena, when the covering membrane 3 is manufactured, a plurality of elastic lines are arranged on the circumferential direction of the covering membrane 3 so as to improve the elastic deformation capacity of the covering membrane, so that the covering membrane 3 can be completely tightened without folds even if the wavy ring-shaped object 6 is not completely unfolded after the stent is expanded, and the covering membrane is completely attached to the inner wall of the aortic arch.

The material of the corrugated ring 6 is a biocompatible polymer, metal or alloy, preferably a metal or alloy with certain support properties, such as metallic titanium or nitinol.

The diameter of the stent body part 1 is set according to the size of the aortic arch of a patient, and is between 2 and 7CM, and 4CM is preferable.

Through the embodiment, the support performance of the support can be guaranteed, meanwhile, the support has good compressibility and unfolding performance, can be stably supported on the aortic arch, conforms to the shape of the aortic arch, and is well attached.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiment shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An aortic arch stent comprises a main body part (1), a flange part (2), a coating film (3), a support rod (4) and an elastic rod (5); the main body part (1) is located in the middle of the support, the flange parts (2) are arranged at two ends of the main body part (1), the diameter of each flange part (2) is larger than that of the main body part (1), the main body part (1) and the flange parts (2) at two ends are formed by connecting wavy rings (6) made of single metal wires, and the wavy rings (6) of the main body part (1) and the flange parts (2) are fixedly connected with each other through a coating (3); the method is characterized in that: the main body part (1) is provided with at least one window, two supporting rods (4) extending along the longitudinal axis of the aortic arch support are arranged on two sides of the window, the rigidity of the supporting rods (4) is greater than that of the wavy ring (6), and an elastic rod (5) is arranged on the opposite side of the two supporting rods (4).

2. The aortic arch support of claim 1, wherein: the coating (3) is made of a biocompatible polymer material.

3. The aortic arch support according to claim 2, wherein the material of the cover (3) is polytetrafluoroethylene.

4. The aortic arch support according to claim 1, wherein the two support rods (4) are parallel to each other, and the angle between the two support rods (4) in the circumferential direction of the main body (1) is less than 120 degrees and greater than 60 degrees.

5. The aortic arch support according to claim 5, wherein the circumferential angle between the two support bars (4) is 90 degrees.

6. The aortic arch support according to claim 1, wherein the welding points between the two support rods (4) and the corrugated ring (6) are located at the peaks or valleys.

7. The aortic arch support according to claim 1, wherein the two support rods (4) and the corrugated ring (6) are made of the same material.

8. The aortic arch support according to claim 7, wherein the diameter of the support rods (4) is larger than the diameter of the undulating ring (6).

9. The aortic arch support according to claim 1, wherein the coating (3) is fixed on the corrugated ring (6) by spraying, heat melting, bonding or sewing.

10. The aortic arch support according to claim 1, wherein the cover (3) is sewn to the undulating ring by means of a suture, and the sewing points (7) are located on the same circumference for the same undulating ring.