CN116138925B

CN116138925B - Fragile artificial vascular liner stent

Info

Publication number: CN116138925B
Application number: CN202310101469.3A
Authority: CN
Inventors: 舒畅; 方坤; 蒲佐; 赵嘉伟
Original assignee: Fuwai Hospital of CAMS and PUMC
Current assignee: Fuwai Hospital of CAMS and PUMC
Priority date: 2023-01-31
Filing date: 2023-01-31
Publication date: 2025-12-23
Anticipated expiration: 2043-01-31
Also published as: CN116138925A

Abstract

The invention discloses an anti-folding artificial blood vessel lining bracket which is arranged at the bifurcation of a main blood vessel and a branch blood vessel and comprises an anti-folding part, wherein one end of the anti-folding part is provided with a positioning part, the other end of the anti-folding part is provided with an anchoring part, the positioning part is matched with the main blood vessel of the artificial blood vessel in a positioning way, the anti-folding part stretches 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 invention effectively supports the connecting part of the artificial blood vessel and the branch blood vessel, and avoids the problem of discounting.

Description

Anti-folding artificial blood vessel lining support

Technical Field

The invention relates to an artificial blood vessel lining bracket capable of being folded.

Background

The acute A-type aortic dissection is a severe fatal cardiovascular surgery emergency, and has the characteristics of urgent onset, serious illness and high mortality. If the operation treatment is not in time, the death rate can reach 50% within 48 hours of the onset of the disease. In terms of treatment, open surgery is currently preferred, the surgical name being ascending aortic replacement, total aortic reconstruction, trunk stent implantation. At present, the vascular material used for ascending initiative and arch reconstruction is Dacron (Dacron) artificial blood vessel. The remodelling of the artificial blood vessel into an integrated blood vessel has no special treatment between the artificial blood vessel main body and the branches, is simply a connection and lacks sufficient support.

In the clinical follow-up work, we find that the phenomenon that the bifurcation starting part of the artificial blood vessel is folded after the operation of part of patients, and part of patients have cerebral ischemia symptoms such as dizziness, amaurosis and syncope symptoms.

Disclosure of Invention

The invention aims to provide an anti-folding artificial blood vessel lining bracket which effectively prevents the problem of folding of an artificial blood vessel at a bifurcation part.

In order to achieve the above purpose, the present invention adopts the following technical scheme:

An anti-folding artificial blood vessel lining support is characterized in that the lining support is arranged at a bifurcation of a main blood vessel and a branch blood vessel and comprises an anti-folding part, one end of the anti-folding part is provided with a positioning part, the other end of the anti-folding part is provided with an anchoring part, the positioning part is matched with the main blood vessel of the artificial blood vessel in a positioning way, the anti-folding part stretches 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.

Preferably, the lining support is made of nickel titanium.

Preferably, the anti-folding part is in a spiral cylinder shape, the anti-folding part is matched with the inner diameter of the branch blood vessel, and the positioning part is in positioning connection with the wall at the branch opening of the main blood vessel of the artificial blood vessel.

Preferably, the positioning part comprises proximal petals, the proximal petals are in a ring-shaped wavy shape, a part of the proximal petals are turned outwards to form an everting part, a perforation is arranged at the crest of the everting part of the proximal petals, and the perforation is connected with the vessel wall of the main body of the artificial blood vessel in a sewing way so as to prevent the lining support from moving distally.

Preferably, the anchoring portion includes distal petals, the distal petals are annular wavy, the peak of the distal petals is provided with an outwardly expanding barb strip towards the trough, and the distal petals are anchored with the inner wall of the branch vessel through the barb strip as a terminal point.

Preferably, the helical bending-resistant part is formed by laser cutting and comprises six helical rods which are uniformly arranged at intervals, free ends of the helical rods, which are close to the petals at the proximal end, of the helical main body are respectively bent with a straight connecting section, and the free ends of the straight connecting sections are connected with the trough parts of the petals at the proximal end.

Preferably, the wall thickness of each screw rod is 0.1-0.3mm, and the width of the rod is 0.2-0.4mm.

Preferably, the length of the lining support is 20-40mm.

The invention has the beneficial effects that the bifurcation initiating part of the artificial blood vessel is effectively supported sufficiently, and the problem of discounting is avoided.

Drawings

In order to more clearly illustrate the embodiments of the present invention, the present embodiments will be described below with reference to the accompanying drawings.

Fig. 1 is a schematic perspective view of the present invention.

Fig. 2 is a schematic structural view of another view of the present invention.

Fig. 3 is a schematic structural view of the present invention in a use state.

Detailed Description

The following examples are given to illustrate possible embodiments of the present invention, but are not intended to limit the scope of the invention.

As shown in figures 1 to 3, the lining support for the blood vessel which can resist folding is made of nickel titanium material preferably and has good flexibility, is arranged at the bifurcation of a main blood vessel and a branch blood vessel, comprises a folding-resisting part 1, one end of the folding-resisting part 1 is provided with a positioning part 2, the other end is provided with an anchoring part 3, the positioning part is matched with the wall of the main blood vessel of the blood vessel, the folding-resisting part stretches into the branch blood vessel of the blood vessel, and the anchoring part is matched with the inner wall of the branch blood vessel.

Preferably, the anti-bending part 1 is preferably in a spiral cylinder shape, the anti-bending part 1 is matched with the inner diameter of the branch blood vessel, and the positioning part 2 is in positioning suture connection with the wall of the branch opening of the main blood vessel of the artificial blood vessel.

Preferably, the positioning part 2 comprises a proximal petal 21, the proximal petal 21 is in a ring wave shape and comprises six wave crests and six wave troughs, a part of the proximal petal 21 is turned outwards and shaped by heat treatment to form an everting part 211, a through hole 212 is arranged at the wave crest of the everting part of the proximal petal and is connected with the main vessel wall of the artificial blood vessel in a sewing way through 3-6 through holes so as to prevent the lining support from moving distally, the anchoring part 3 comprises a distal petal 31, the distal petal 31 is in a ring wave shape, an outward expansion bending barb strip 311 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 branched blood vessel through the barb strip 311 as a terminal point. At the moment, the bracket can not move or scratch in the artificial blood vessel, and the spiral main body can be better deformed to conform to the bending angle in the bending process of the artificial blood vessel. The wave crest is far away from the spiral main body, and the wave trough is connected with the spiral main body.

The proximal petal structure can be used for conveniently sewing and positioning while guaranteeing the stability of the lining support. The supraarch branch artery is in a long-term beating state due to its proximity to the heart, and is immediately adjacent to the chest. Therefore, heart beating and respiratory movement can possibly lead to relative displacement of the artificial blood vessel branch and the lining support, more importantly, after the artificial blood vessel is implanted into a body, the blood vessel main body and the branch can be remodeled by changing physical and chemical properties in the body over time, such as hematoma absorption, chronic aseptic inflammation tissue wrapping and the like, and simultaneously, the design can avoid the retraction of the lining support, further ensure the stability of the support, so that the far-end petals are preferably in a barb strip structure.

In this embodiment, preferably, the spiral body is formed by cutting with laser, the spiral structure has better bending performance and optimal bending resistance, and meanwhile, the structure can maximally ensure the smoothness of the external blood vessel under the limit angulation because the stent is not an interventional instrument and does not need to consider the beam-contracting capability, the spiral body 1 comprises six spiral rods which are uniformly arranged at intervals, the free ends of the six spiral rods, which are close to the petals at the proximal end, of the spiral body are respectively bent with straight connecting sections 11, and the free ends of the straight connecting sections 11 are connected with the trough parts of the petals at the proximal end. Preferably, the wall thickness of each screw rod is 0.1-0.3mm, and the width of the rod is 0.2-0.4mm, and the flexibility and the compressive strength are better. The everting part of the proximal petals is 90 degrees with the central axis of the spiral main body, the straight connecting section is parallel to the central axis of the spiral main body, and the outer diameter of the everting part of the proximal petals is matched with the inner diameter of the main body blood vessel of the artificial blood vessel.

The length of the artificial blood vessel lining support is preferably 20-40mm, the artificial blood vessel lining support can better cover the bending part of a branched blood vessel, the installation of the support with too long is somewhat complicated, and the artificial blood vessel lining support cannot cover the bending section to cause the blood vessel to be folded at the tail end of the support.

Claims

1. An anti-folding artificial blood vessel lining support is characterized in that the lining support is arranged at the bifurcation of a main blood vessel and a branch blood vessel and comprises an anti-folding part, one end of the anti-folding part is provided with a positioning part, the other end of the anti-folding part is provided with an anchoring part, the positioning part is matched with the main blood vessel of the artificial blood vessel in a positioning way, the anti-folding part stretches 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 anti-folding part is in a spiral cylinder shape, the anti-folding part is matched with the inner diameter of the branch blood vessel, and the positioning part is in positioning connection with the wall of the branch opening of the main body blood vessel of the artificial blood vessel;

the positioning part comprises proximal petals, the proximal petals are in an annular wavy shape, a part of the proximal petals are turned outwards to form an everting part, a perforation is arranged at the crest of the everting part of the proximal petals, and the perforation is connected with the wall of a main body vessel of the artificial blood vessel in a sewing way so as to prevent the lining bracket from moving towards the distal end;

the anchoring part comprises distal petals which are in an annular wavy shape, wherein the wave crest of each distal petal is provided with an outward-expanding barb strip towards the wave trough, and the distal petals are anchored with the inner wall of the branch vessel through the barb strip serving as a terminal point;

the lining support is made of nickel titanium, and the length of the lining support is 20-40mm;

the free ends of the six spiral rods, which are close to the petals at the proximal end, of the spiral cylindrical bending-resistant part are respectively bent with a straight connecting section, and the free ends of the straight connecting sections are connected with the trough parts of the petals at the proximal end.

2. The flexible vessel lining stent of claim 1, wherein the flexible vessel lining stent is formed by cutting a cylindrical flexible vessel by laser, and comprises six spiral rods which are uniformly arranged at intervals.

3. The flexible vessel lining stent of claim 2, wherein the wall thickness of each of the helical rods is 0.1-0.3mm and the width of the rods is 0.2-0.4mm.