Collapsible endovascular graft liner stent

Abstract

The application discloses an anti-folding artificial blood vessel lining support which is installed at a bifurcation of a main blood vessel and a branch blood vessel and comprises an anti-folding part, a positioning part arranged at one end of the anti-folding part and an anchoring part arranged at the other end of the anti-folding part, wherein the positioning part is positioned in cooperation with the main blood vessel of the artificial blood vessel, the anti-folding part extends into the branch blood vessel of the artificial blood vessel, and the anchoring part is matched with the inner wall of the branch blood vessel. The application effectively provides sufficient support for the connecting part of the artificial blood vessel and the branch blood vessel, and avoids the folding problem.

Description

TECHNICAL FIELD

[0001] The present application relates to an anti-fold artificial blood vessel lining stent. BACKGROUND

[0002] Acute aortic dissection type A is a serious cardiovascular surgical emergency with the characteristics of acute onset, severe condition and high mortality. If not treated in time, the mortality rate within 48 hours of onset can reach 50%. In terms of treatment, the first choice is open surgery, and the operation name is ascending aorta replacement, total aortic arch reconstruction and elephant trunk implantation. At present, the blood vessel material used for ascending aorta and arch reconstruction is Dacron artificial blood vessel. The modified artificial blood vessel is an integrated blood vessel, and there is no special treatment between the main body and the branch of the artificial blood vessel, only a simple connection, which lacks sufficient support.

[0003] In the clinical follow-up work, we found that some patients had a folding phenomenon at the starting position of the artificial blood vessel bifurcation after the operation, and some patients had cerebral ischemia symptoms such as dizziness, blackout and syncope. SUMMARY

[0004] The purpose of the present application is to provide an anti-fold artificial blood vessel lining stent which effectively prevents the folding problem at the bifurcation of the artificial blood vessel.

[0005] In order to achieve the above-mentioned purpose, the present application adopts the following technical scheme:

[0006] An anti-fold artificial blood vessel lining stent, characterized in that: the lining stent is installed at the bifurcation of the main blood vessel and the branch blood vessel, and comprises an anti-fold part, a positioning part at one end of the anti-fold part, and an anchoring part at the other end, the positioning part is positioned and matched with the main blood vessel of the artificial blood vessel, the anti-fold part extends into the branch blood vessel of the artificial blood vessel, and the anchoring part is matched with the inner wall of the branch blood vessel.

[0007] Preferably, the lining stent is made of nickel-titanium material.

[0008] Preferably, the anti-fold part is a spiral cylinder, the anti-fold part matches the inner diameter of the branch blood vessel, and the positioning part is positioned and connected with the wall at the branch opening of the main blood vessel of the artificial blood vessel.

[0009] Preferably, the positioning part comprises a proximal petal, the proximal petal is annular and wavy, part of the proximal petal is turned outward to form an everted part, a perforation is arranged at the wave crest of the everted part of the proximal petal, and the perforation is sutured and connected with the wall of the main blood vessel of the artificial blood vessel to prevent the lining stent from moving distally.

[0010] Preferably, the anchoring part includes a distal petal, which is wavy in shape and has outwardly expanding barbs at the crests and troughs of the wavy part. The distal petal is anchored to the inner wall of the branch vessel by the barbs as its endpoint.

[0011] Preferably, the anti-bending part of the spiral tube is laser-cut and includes six spiral rods evenly spaced. The free ends of the six spiral rods near the proximal petal of the spiral body are bent into straight connecting sections, and the free ends of the straight connecting sections are connected to the troughs of the proximal petal.

[0012] Preferably, the wall thickness of each of the spiral rods is 0.1-0.3 mm, and the width of the rod is 0.2-0.4 mm.

[0013] Preferably, the length of the inner lining support is 20-40mm.

[0014] The beneficial effects of this invention are: this invention effectively provides sufficient support to the starting part of the artificial blood vessel bifurcation, avoiding the problem of kinking. Attached Figure Description

[0015] To more clearly illustrate the embodiments of the present invention, the embodiments will be described below in conjunction with the accompanying drawings.

[0016] Fig. 1 This is a three-dimensional structural diagram of the present invention.

[0017] Fig. 2 This is a structural schematic diagram from another perspective of the present invention.

[0018] Fig. 3 This is a structural diagram of the present invention in use. Detailed Implementation

[0019] The following examples illustrate possible implementations of the present invention, but are not intended to limit the scope of protection of the present invention.

[0020] like Figs. 1 to 3 As shown, this invention provides a fold-resistant artificial blood vessel liner stent, preferably made of nickel-titanium material, which has good flexibility. The liner stent is installed at the bifurcation of the main blood vessel and the branch blood vessel. It includes a fold-resistant part 1, a positioning part 2 at one end of the fold-resistant part 1, and an anchoring part 3 at the other end. The positioning part is positioned and engaged with the wall of the main blood vessel of the artificial blood vessel. The fold-resistant part extends into the branch blood vessel of the artificial blood vessel, and the anchoring part engages with the inner wall of the branch blood vessel.

[0021] Preferably, the anti-bending part 1 is spiral cylindrical, and the anti-bending part 1 matches the inner diameter of the branch blood vessel. The positioning part 2 is positioned and sutured to the wall of the branch opening of the main blood vessel of the artificial blood vessel.

[0022] Preferably, the positioning part 2 comprises a proximal petal 21 which is annularly undulated, comprising six peaks and six valleys, a part of the proximal petal 21 is turned outward and heat treated to form an everted part 211, a perforation 212 is arranged at the peak of the everted part of the proximal petal, and the proximal petal is sutured to the main vessel wall of the artificial blood vessel through 3-6 perforations to prevent the endovascular stent from moving distally; the anchoring part 3 comprises a distal petal 31 which is annularly undulated, and a barbed strip 311 is arranged at the peak of the distal petal and extends outward to the valley, and the distal petal is anchored to the inner wall of the branch vessel through the barbed strip 311 as the terminal point. At this time, the stent will no longer move or scratch in the artificial blood vessel, and at the same time, the spiral body can better deform to adapt to the bending angle in the process of bending of the artificial blood vessel. The peak is away from the spiral body, and the valley is connected with the spiral body.

[0023] The proximal petal structure can ensure the stability of the endovascular stent while facilitating suture positioning. The arch branch artery is close to the heart, and the heart is in a long-term pulsation state. In addition, the branch artery is adjacent to the chest. Therefore, the heart pulsation and respiratory movement can cause relative displacement of the artificial blood vessel branch and the endovascular stent; more importantly, after the artificial blood vessel is implanted in the body, with the passage of time, the main vessel and the branch vessel will be remodeled due to changes in the physicochemical properties in the body, such as absorption of hematoma and wrapping of chronic aseptic inflammatory tissue; at the same time, the design can avoid the retraction of the endovascular stent, thereby ensuring the stability of the stent, and therefore the distal petal is preferably a barbed strip structure.

[0024] In the embodiment, preferably, the spiral body is cut by laser, and the spiral structure has good bending performance and optimal folding resistance. Since the stent is a non-invasive instrument, the convergence ability does not need to be considered, so the structure can maximize the patency of the external blood vessel under the limit angle; the spiral body 1 comprises six spiral rods which are arranged at uniform intervals, and the free ends of the six spiral rods close to the proximal petal are respectively bent to have straight connecting sections 11, and the free ends of the straight connecting sections 11 are connected to the valleys of the proximal petal. Preferably, the wall thickness of each spiral rod is 0.1-0.3 mm, and the width of the rod is 0.2-0.4 mm, and the flexibility and compression strength are better. The everted part of the proximal petal is at 90 degrees to the central axis of the spiral body, the straight connecting section is parallel to the central axis of the spiral body, and the outer diameter of the everted part of the proximal petal matches the inner diameter of the main vessel of the artificial blood vessel.

[0025] The length of the artificial blood vessel endovascular stent is preferably 20-40 mm, which can better cover the curved part of the branch vessel. If the stent is too long, the installation will be slightly cumbersome, and if it is too short, it will not cover the curved section, resulting in folding of the blood vessel at the end of the stent.

Claims

1. A collapsible artificial blood vessel lining stent, characterized by: The inner lining support is installed at the bifurcation of the main blood vessel and the branch blood vessel, and comprises a bending-resistant part, a positioning part at one end of the bending-resistant part, and an anchoring part at the other end, the positioning part is positioned with the main blood vessel of the artificial blood vessel, the bending-resistant part extends into the branch blood vessel of the artificial blood vessel, and the anchoring part is matched with the inner wall of the branch blood vessel; The bending-resistant part is a spiral cylinder, the bending-resistant part is matched with the inner diameter of the branch blood vessel, and the positioning part is positioned and connected with the wall at the branch opening of the main blood vessel of the artificial blood vessel; The positioning part comprises a proximal petal, the proximal petal is annular and wavy, part of the proximal petal is turned outward to form an everted part, a perforation is arranged at the wave crest of the everted part of the proximal petal, and the perforation is sutured and connected with the wall of the main blood vessel of the artificial blood vessel to prevent the inner lining support from moving distally; The anchoring part comprises a distal petal, the distal petal is annular and wavy, an outwardly expanded barbed strip is arranged at the wave crest of the distal petal towards the wave trough, and the distal petal is anchored with the inner wall of the branch blood vessel through the barbed strip as the terminal point; The inner lining support is made of nickel-titanium material, and the length of the inner lining support is 20-40 mm; The free ends of the six spiral rods of the bending-resistant part close to the proximal petal are respectively bent to have straight connecting segments, and the free ends of the straight connecting segments are connected with the wave trough of the proximal petal.

2. The anti-kink artificial vascular graft liner stent of claim 1, wherein: The bending-resistant part in the spiral cylinder is cut by laser, and comprises six spiral rods which are arranged in uniform intervals.

3. The anti-kink artificial vascular graft liner stent of claim 2, wherein: The wall thickness of each spiral rod is 0.1-0.3 mm, and the width of the rod is 0.2-0.4 mm.

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