CN112022430A

CN112022430A - Novel covered stent for aortic arch

Info

Publication number: CN112022430A
Application number: CN202010831815.XA
Authority: CN
Inventors: 吴林辉; 陈贡发; 刘宗超
Original assignee: Guangdong University of Technology
Current assignee: Guangdong University of Technology
Priority date: 2020-08-18
Filing date: 2020-08-18
Publication date: 2020-12-04

Abstract

The invention discloses a novel coated vascular stent for an aortic arch, which comprises a keel, a plurality of wave rings and a coated membrane, wherein the wave rings are distributed along the length direction of the keel respectively, and the wave rings are fixedly connected to the keel; the covering film covers the outer surface or the inner surface of the wave ring to form a pipe bracket structure; the front part of the covering film is provided with a plurality of through holes. According to the invention, the flexibility of the front part of the pipe support structure is improved by arranging the high-low wave ring at the front part of the keel; after the stent is released in the aortic arch, the stent structure part of the high-low wave ring at the aortic arch is perfectly attached to the aortic wall, the curve of the aortic arch can be effectively attached, the blood flow rate and the blood pressure in the aortic aneurysm are reduced through the round hole cutting seam on the tectorial membrane, so that the environment is created by thrombus, the blood flow volume of the upper three branches can be ensured, and the safety and the reliability of treatment are improved.

Description

Novel covered stent for aortic arch

Technical Field

The invention belongs to the technical field of medical instruments, and particularly relates to a novel covered stent for an aortic arch.

Background

Thoracic aortic arch aneurysms are pathological dilations of the aortic segment that emanate at the aortic arch and have a tendency to dilate and rupture. It is generally considered that the diameter of the aorta is more than 50% larger than the normal diameter of the aorta at the same age and sex, and it is considered that the part of the aorta has an aneurysm. The pathogenesis of the disease comprises heredity, trauma, hypertension, aortic atherosclerosis, iatrogenic injury and the like. Patients with aortic aneurysms have a high mortality rate and unbroken aneurysms are often asymptomatic, with most patients being diagnosed with essentially an occasional diagnosis in clinical examination or in population screening.

Clinically, the traditional treatment scheme for the diseases is to perform artificial vascular replacement of the thoracotomy aortic arch (Bental operation), and the chest-opening operation has huge wound, needs external circumfluence and huge operation risk, and the death rate of the traditional operation scheme is up to 50 percent. In order to save lives of patients, the chimney bracket implantation technology on the arch is invented, the chimney bracket is a traditional circular bracket, the technology of single chimney, double chimney and triple chimney brackets is developed on the arch, but obvious gaps often exist between the single chimney bracket, the double chimney bracket and the triple chimney bracket and between the bracket and an aorta bracket, so that internal leakage is obvious and cannot be effectively attached, further interlayer lacerations or aneurysms cannot be well blocked, and serious consequences such as tumor body rupture and the like are finally caused.

Disclosure of Invention

The present invention aims to solve the above problems and provide a novel covered vessel stent structure for aortic arch which is safe and reliable in use. When the stent is used, the stent is released in an aortic arch, the high-low wave stent part at the aortic arch is perfectly attached to the aortic wall, the blood flow rate and the blood pressure in an aortic aneurysm are reduced through the round hole cutting seam on the tectorial membrane, so that the environment is created by thrombus, the blood flow volume of the upper three branches can be ensured, and the safety and the reliability of treatment are improved.

The purpose of the invention can be achieved by adopting the following technical scheme:

a novel coated vascular stent for an aortic arch comprises a keel, a plurality of wave rings and a coating, wherein the wave rings are distributed along the length direction of the keel respectively, and the wave rings are fixedly connected to the keel; the covering film covers the outer surface or the inner surface of the wave ring to form a pipe bracket structure; the front part of the covering film is provided with a plurality of through holes.

As a preferable scheme, the wave ring comprises a plurality of high-low wave rings and equal-height wave rings, the high-low wave rings are arranged at the front part of the keel, wherein the first wave ring at the front part of the keel is an equal-height wave ring; the equal-height wave ring is arranged at the tail part of the keel.

As a preferable scheme, the high-low wave ring comprises a first wave ring and a second wave ring, two ends of the first wave ring are connected with the keel through the second wave ring, the wavelength of the first wave ring is smaller than that of the second wave ring, and the wave crest and the wave trough of the first wave ring are smaller than those of the second wave ring; the equal-altitude wave ring is a simple harmonic wave.

Preferably, the number of the high-low wave circles is 4, and the number of the high-high wave circles is 6.

Preferably, the tube support structure is arcuate in shape.

Preferably, the diameter of the radial cross section of the tube support structure is 110-120% of the diameter of the aorta.

Preferably, the keel and the wave ring are made of metal wires.

Preferably, the through hole is a circular hole.

The implementation of the invention has the following beneficial effects:

1. according to the invention, a proper number of wave rings and the area of the through hole on the coating can be selected according to the growth position of the aneurysm, then the stent is released in the aortic arch, the blood flow rate and the blood pressure in the aortic aneurysm are reduced through the round hole cutting slit on the coating, so as to create an environment for thrombus, and when the aneurysm affects the upper three-branch artery, the coating cutting slit on the coating stent enables the blood to flow into the upper three-branch artery under the pressure of the blood flow, so that the blood flow of the upper three-branch artery can be ensured, a better anchoring effect can be obtained at the aortic arch, and the safety and the reliability of treatment are improved. In addition, the waved shape of the wavering has better movable contraction capacity, so that the use effect of the patient during movement is improved.

2. According to the invention, the high-low wave ring is arranged at the front part of the keel, so that the bending resistance of the keel can be reduced, and the flexibility of the front part of the pipe support structure is improved; after the stent is released in the aortic arch, the stent structure part of the high-low wave ring at the aortic arch perfectly fits the aortic wall, so that the stent can effectively fit the bending of the aortic arch, and the problems that the prior stent often has obvious gaps between the stent and the aortic blood vessel, thus the internal leakage is obvious, the effective fit is not realized, and the dissection or aneurysm cannot be blocked well are solved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a structural schematic diagram of the novel covered stent for an aortic arch according to the present invention.

Fig. 2 is a schematic structural view of fig. 1 after the cover film is removed.

Fig. 3 is a plan development view of fig. 1.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Examples

Referring to fig. 1 to 3, the present embodiment relates to a novel covered stent for an aortic arch, which includes a keel 1, a plurality of wave rings 2 and a covering film 3, wherein the wave rings 2 are distributed along the length direction of the keel 1, and the wave rings 2 are fixedly connected to the keel 1; the film 3 covers the outer surface or the inner surface of the wave ring 2 to form a pipe bracket structure; the front part of the coating 3 is provided with a plurality of through holes 31.

According to the invention, a proper number of wave rings 2 and the area of the film 3 with the through hole 31 are selected according to the growth position of the tumor body, the stent is released in the aortic arch, the blood flow rate and the blood pressure in the aortic aneurysm are reduced through the round hole cutting slit on the film 3 to form a thrombus creating environment, and when the tumor body affects the upper three-branch artery, the film 3 cutting slit on the film 3 stent can enable the blood to flow into the upper three-branch artery under the pressure action of the blood flow, so that the blood flow of the upper three branches can be ensured, a better anchoring effect can be obtained at the aortic arch, and the safety and the reliability of treatment are improved. In addition, the waved shape of the wavering has better movable contraction capacity, so that the use effect of the patient during movement is improved.

The wave ring 2 comprises a plurality of high-low wave rings 21 and equal-height wave rings 22, the high-low wave rings 21 are arranged at the front part of the keel 1, wherein the first wave ring at the front part of the keel 1 is the equal-height wave ring 22; the equal-height wave ring 22 is arranged at the tail part of the keel 1. The high-low wave ring 21 comprises a first wave ring 211 and a second wave ring 212, two ends of the first wave ring 211 are connected with the keel 1 through the second wave ring 212, the wavelength of the first wave ring 211 is smaller than that of the second wave ring 212, and the wave crest and the wave trough of the first wave ring 211 are smaller than those of the second wave ring 212; the contour rings 22 are simple harmonics.

According to the structure, the high-low wave ring 21 is arranged at the front part of the keel 1, so that the bending resistance of the part can be reduced, and the flexibility of the front part of the pipe support structure is improved; after the stent is released in the aortic arch, the stent structure part of the high-low wave ring 21 at the aortic arch perfectly fits the aortic wall, so that the stent can effectively fit the bending of the aortic arch, and the problems that the prior stent often has obvious gaps between the stent and the aortic blood vessel, thus the internal leakage is obvious, the effective fit is not realized, and the dissection or aneurysm cannot be well blocked are solved.

The number of the high-low wave rings 21 is 4, and the number of the high-high wave rings 22 is 6. Of course, the invention can select a proper number of wave rings according to the growth position of the tumor body.

In order to match the tube support structure to the aortic blood vessel, the tube support structure is arc-shaped.

The diameter of the radial section of the tube stent structure is 110-120% of the diameter of the aorta. The keel 1 and the wave ring 2 are made of metal wires. The through hole 31 is a circular hole. Of course, the through-hole 31 may be square or triangular.

While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiment, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims

1. A novel coated vascular stent for an aortic arch is characterized by comprising a keel, a plurality of wave rings and a coated membrane, wherein the wave rings are distributed along the length direction of the keel respectively, and the wave rings are fixedly connected to the keel; the covering film covers the outer surface or the inner surface of the wave ring to form a pipe bracket structure; the front part of the covering film is provided with a plurality of through holes.

2. The novel covered stent for an aortic arch according to claim 1, wherein the wave ring comprises a plurality of high-low wave rings and equal-height wave rings, the high-low wave rings are arranged at the front part of the keel, and the first wave ring at the front part of the keel is an equal-height wave ring; the equal-height wave ring is arranged at the tail part of the keel; the high-low wave ring comprises a first wave ring and a second wave ring, two ends of the first wave ring are connected with the keel through the second wave ring, the wavelength of the first wave ring is smaller than that of the second wave ring, and the wave crest and the wave trough of the first wave ring are smaller than those of the second wave ring; the equal-altitude wave ring is a simple harmonic wave.

3. The stent of claim 2, wherein the number of the high-low wave circles is 4, and the number of the high-high wave circles is 6.

4. The novel covered stent for an aortic arch of claim 1, wherein the stent structure is arc-shaped.

5. The novel covered stent for aortic arch of claim 1 or 4, wherein the diameter of the radial section of the stent structure is 110-120% of the diameter of the aorta.

6. The novel covered stent for an aortic arch of claim 1, wherein the keel and the wave ring are wires.

7. The novel covered stent for aortic arch of claim 1, wherein the through hole is a circular hole.