A branch vascular stent

Abstract

The present invention discloses a branched blood vessel stent, belonging to the technical field of medical devices. It includes a cylindrical branched covered main body and a branched bare stent fixed on the branched covered main body; a disc-shaped bottom cover film is butted at the lower end of the branched covered main body; a plum blossom bare stent is fixed on the lower side surface of the bottom cover film; a felt is covered on the upper side surface of the bottom cover film; a plurality of anchoring spines arranged around the center of the bottom cover film penetrate through the bottom cover film and the felt; the lower end of the anchoring spine is buckled on the plum blossom bare stent, and the upper end of the anchoring spine extends beyond the felt and has barbs inclined downward. The branched blood vessel stent is independent of the main blood vessel stent, can be replaced or adjusted at any time, and has good adaptability; the detachable and adjustable felt ring has better sealing performance, can reduce the difficulty of surgical operation and save surgical time; the anchoring spines fixedly connect various parts of the branched blood vessel stent and can be anchored into the main blood vessel stent and the native blood vessel, avoiding the subsequent displacement problem of the branched blood vessel stent.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly relates to a branched blood vessel stent. Background Art

[0002] Aortic diseases, as common diseases in the spectrum of cardiovascular diseases, have a rapidly increasing incidence rate, such as acute type A aortic dissection, aneurysms involving the aortic arch, atherosclerosis, aortic ulcers, etc. These diseases greatly endanger human health and even threaten life.

[0003] Open surgical operation is the main method for treating acute type A aortic dissection and aneurysms involving the aortic arch. The commonly used surgical procedure is total aortic arch replacement combined with stent elephant trunk procedure. The currently known latest surgical plan is that the stent blood vessel and the artificial blood vessel are of an integral structure, which can shorten the surgical suture time of the main body anastomosis. However, there are still some problems:

[0004] 1. It is still necessary to dissect the three branched blood vessels of the arch, especially the left subclavian artery, which increases the surgical operation time;

[0005] 2. Some medical device manufacturers or doctors have thought of stents with branches synchronously, so that the blood vessels can be dissected and the operation time can be shortened when released. However, for the artificial blood vessel stent with an integral branched stent, since the size of the branched blood vessel stent has been pre-sutured and fixed in advance, the diameters of the left subclavians of different patients are different, and even some diseased blood vessels can only be known the final size after the patient's chest is opened. Therefore, it is very difficult to achieve a branched stent that perfectly fits the branched blood vessels. When an oversized branched blood vessel stent enters the native blood vessel, it will inevitably cause further dilatation damage or even tearing to the already aged blood vessel. When an undersized branched blood vessel stent enters the native blood vessel, it will inevitably cause a gap between the native blood vessel and the branched blood vessel stent, and then cause reflux and endoleakage;

[0006] In the traditional pre-opening method of the main body blood vessel stent, the preset branch openings are determined, and the corresponding branches are also determined, with matching. This results in that once the main body artificial blood vessel stent is selected, it is very difficult to adjust the branched blood vessel stent again;

[0007] The existing branched blood vessel stent itself does not have an anchoring function. At the same time, there is no specific elastic member to support between the branched blood vessel stent and the main body blood vessel stent, which causes the branched blood vessel stent to separate from the main body blood vessel stent under the influence of hemodynamics, and then causes displacement. Summary of the Invention

[0008] The objective of the invention is to provide a branched blood vessel stent, which can ensure that blood vessels are no longer dissected during the operation, shortening the operation time; at the same time, it can optimally match the branched blood vessels of different patients. After the branched blood vessel stent is assembled into the human body, it can fully adhere to the native branched blood vessels without internal leakage and displacement.

[0009] The present invention adopts the following technical solution: a branched blood vessel stent, comprising a cylindrical branched covered stent body and a branched bare stent fixed on the branched covered stent body;

[0010] It further comprises:

[0011] a disc-shaped bottom covered membrane, which is butted at the lower end of the branched covered stent body;

[0012] a plum blossom bare stent, which is fixed on the lower side of the bottom covered membrane;

[0013] felt, which covers the upper side of the bottom covered membrane;

[0014] a plurality of anchoring spines arranged around the center of the bottom covered membrane, the anchoring spines penetrate through the bottom covered membrane and the felt; the lower end of the anchoring spine is buckled on the plum blossom bare stent, and the upper end of the anchoring spine extends beyond the felt and has barbs inclined downward.

[0015] Preferably: the anchoring spine has a vertical portion, and the upper end of the vertical portion has a tip;

[0016] The lower end of the vertical portion has a first bending portion, and one end of the first bending portion away from the vertical portion has a reverted portion; the plum blossom bare stent is buckled in the first bending portion; the gap between the reverted portion and the vertical portion is smaller than the cross-sectional dimension of the plum blossom bare stent, for restricting the plum blossom bare stent from disengaging from the first bending portion.

[0017] Preferably: the barb is arranged on one side of the tip of the vertical portion.

[0018] Preferably: one end of the reverted portion away from the first bending portion has a straight segment, and the other end of the straight segment has a second bending portion, and the second bending portion is attached to the lower side of the bottom covered membrane.

[0019] Preferably: the inner side edge of the bottom covered membrane is stitched and fixed at the lower end of the branched covered stent body, and radial elongated holes are formed on the bottom covered membrane and arranged around the center of the bottom covered membrane; the vertical portion and the reverted portion of the anchoring spine are arranged in the elongated holes.

[0020] Preferably: the plum blossom bare stent is bent with evenly distributed rounded corners, and the plum blossom bare stent has an annular multi-pointed star structure; the first bending portion of the vertical portion is buckled at the rounded corner vertex of the plum blossom bare stent.

[0021] Preferably: the plum blossom bare stent is stitched and fixed on the bottom covered membrane through a suture.

[0022] Preferably, the felt is in a disc shape, and small holes for the anchor piercing are arranged around the center of the felt.

[0023] Preferably, a plurality of the branch bare stents are sutured and fixed on the outer surface or the inner surface of the branch covered membrane body at a certain interval by suture threads.

[0024] Preferably, after the branch blood vessel stent is installed at the branch opening of the main blood vessel, a support ring is used to support in the main blood vessel at the branch opening; the expanded support ring presses the felt, the bottom covered membrane and the plum blossom bare stent against the inner wall of the main blood vessel, and the tip of the anchor piercing is pierced into the inner wall of the main blood vessel.

[0025] The beneficial effects of the present invention are as follows:

[0026] The branch blood vessel stent is independent of the main blood vessel stent, and the branch stent blood vessel and its felt ring with different diameters can be replaced at any time, having good adaptability, and will not cause damage to the native blood vessel due to the over-large branch blood vessel stent or cause the occurrence of endoleak due to the over-small branch blood vessel stent;

[0027] The felt ring of the branch blood vessel stent is detachable and adjustable and has better sealing performance, so that the main blood vessel stent does not need to be positioned too precisely, simplifies the surgical operation difficulty, saves the surgical time, and the surgical risk of the patient is smaller;

[0028] The anchor piercing integrally fixes and connects each part of the branch blood vessel stent together, improving the overall stability; after the branch blood vessel stent is installed in place, the anchor piercing can be firmly anchored to the main blood vessel stent and the native blood vessel. Under hemodynamic conditions, the main and branch blood vessel stents will not shift, thus avoiding the problems of treatment failure or causing other serious complications. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0030] Figure 1 It is a perspective view of a branch blood vessel stent of the present invention.

[0031] Figure 2 It is a front view of a branch blood vessel stent of the present invention.

[0032] Figure 3 It is Figure 2 an enlarged view of part A in

[0033] Figure 4This is the bottom view of a branch blood vessel stent of the present invention.

[0034] Figure 5 This is the front view of the anchoring thorn in the present invention.

[0035] Figure 6 This is the perspective view of the anchoring thorn in the present invention.

[0036] Figure 7 This is the front view of the branch bare stent in the present invention.

[0037] Figure 8 This is the front view of the plum blossom bare stent in the present invention.

[0038] Figure 9 This is the front view of the bottom film in the present invention.

[0039] Figure 10 This is the front view of the felt in the present invention.

[0040] Figure 11 This is the perspective view of the support ring in the present invention.

[0041] Figure 12 Schematic diagram of the installation of the present invention Figure One 。

[0042] Figure 13 Schematic diagram of the installation of the present invention Figure Two 。

[0043] Explanation of reference numerals in the drawings:

[0044] 1. Branch film-covered main body; 2. Branch bare stent; 3. Bottom film; 31. Long hole; 4. Plum blossom bare stent; 5. Felt; 6. Anchoring thorn; 61. Barbs; 62. Vertical part; 63. First bending part; 64. Refolded part; 65. Straight line segment; 66. Second bending part; 7. Support ring; 8. Balloon; 9. Main blood vessel stent; 10. Native blood vessel. Detailed implementation manners

[0045] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention. Embodiment 1

[0046] As Figures 1 to 4 shown, the present invention provides a branch blood vessel stent. The branch film-covered main body 1 is cylindrical, and the branch bare stent 2 is fixedly sutured on the outer surface or the inner surface of the branch film-covered main body 1 through a suture thread. As Figure 7As shown, the branch bare stents 2 are distributed at a certain interval. The bottom film 3 is disc-shaped and is butt-jointed to the lower end of the branch film body 1 through suture lines. The bottom film 3 and the branch film body 1 form a "T" structure. A plum blossom bare stent 4 is fixed on the lower side of the bottom film 3, and a felt 5 is covered on the upper side of the bottom film 3. A plurality of anchoring spines 6 are evenly distributed around the center of the bottom film 3. The anchoring spines 6 are buckled on the plum blossom bare stent 4 and pass through the bottom film 3 and the felt 5 from the lower side to fix the felt 5, the bottom film 3 and the plum blossom bare stent 4 together.

[0047] Combined with Figure 5 , Figure 6 As shown, one side of the upper end of the anchoring spine 6 has a barb 61. The upper end of the anchoring spine 6 extends beyond the felt 5 and is used to locate on the inner wall of the blood vessel;

[0048] The anchoring spine 6 is integrally bent and formed. The upper end of the vertical part 62 has a tip, and one side of the tip has a barb 61 facing downward for cleaning. At the lower end of the vertical part 62 is a first bending part 63. The first bending part 63 forms a circular bayonet for buckling the plum blossom bare stent 4. After the first bending part 63 is a reverse folding part 64. The gap between the reverse folding part 64 and the vertical part 62 is smaller than the cross-sectional dimension of the plum blossom bare stent 4. Relying on the elasticity of the anchoring spine 6 itself, the plum blossom bare stent 4 can be pressed into the first bending part 63 from this gap. The reset reverse folding part 64 can effectively prevent the plum blossom bare stent 4 from disengaging from the first bending part 63. After the reverse folding part 64, a second bending part 66 is arranged through a straight line segment 65. The second bending part 66 is in a horizontal state and can fit well on the lower side of the bottom film 3, playing a certain supporting role and cooperating with the plum blossom bare stent 4 to prevent the rotation of the vertical part 62 and improve the stability of the vertical part 62. Embodiment Two

[0049] On the basis of the above Embodiment One, combined with Figures 1 to 4 , and Figure 9 As shown, the inner side edge of the bottom film 3 is fixedly sutured to the lower end of the branch film body 1 through suture lines. A long hole 31 is formed on the bottom film 3 and is arranged around the center of the bottom film 3. The long hole 31 is opened along the radial direction of the bottom film 3. During use, the vertical part 62 and the reverse folding part 64 of the anchoring spine 6 are both inserted into the long hole 31, and the straight line segment 65 and the second bending part 66 are attached to the lower side of the bottom film 3;

[0050] As Figure 8 shown, the plum blossom bare stent 4 is bent with evenly distributed rounded corners, forming an overall annular multi-pointed star structure. The plum blossom bare stent 4 is fixedly sutured to the lower side of the bottom film 3 through suture lines; each anchoring spine 6 is correspondingly buckled at the rounded corner vertex of the plum blossom bare stent 4;

[0051] As Figure 10As shown, the felt 5 is disc-shaped, and is provided with small holes arranged around the center of the felt 5 ; when in use, the small holes of the felt 5 are penetrated on the vertical portion 62 of the anchoring thorn 6 .

[0052] Working principle: Combination Figures 11 to 13 As shown, the auxiliary parts for the branch vessel stent during installation include a balloon 8, a balloon catheter, a support ring 7, and a delivery system thereof, which are installed after the main vessel stent 9 is installed;

[0053] After compression, the branch vessel stent is gathered at the front end of the delivery system. When it moves to the release position (the branch opening of the main vessel), the felt 5 at the bottom of the branch vessel stent is pressed against the inside of the main vessel. The branch vessel stent is then released by operating the handle. At this point, the anchoring thorns 6 do not pierce the wall of the main vessel stent 9 or the wall of the native blood vessel 10.

[0054] Then, the support ring 7 is released through the conveying system, and then the support ring 7 is expanded by the balloon 8. The positioning pins around the support ring 7 play a role of fixing and positioning; the opened support ring 7 presses against the end of the branch blood vessel stent, so that the felt 5, the bottom film 3 and the plum blossom bare stent 4 press against the inner wall of the main blood vessel, and the vertical part 62 of the anchoring thorn 6 pierces the wall of the main blood vessel stent 9, and then pierces the wall of the native blood vessel 10 to achieve fixation.

[0055] During the operation, it is normally difficult to accurately release the branch vessel stent for smaller and more tortuous native blood vessels. In this embodiment, in this case, the main vessel stent 9 with a large branch opening can be replaced, and the felt 5 of the branch vessel stent 9 can be enlarged. In this way, the positioning of the branch vessel stent 9 can be easily released without being more precise, thereby greatly shortening the operation time.

[0056] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A branched blood vessel stent, comprising a cylindrical branched covered main body (1) and a branched bare stent (2) fixed on the branched covered main body (1); It is characterized in that It further comprises: A disc-shaped bottom covering film (3), docked at the lower end of the branched covered main body (1); A plum blossom bare stent (4), fixed on the lower side of the bottom covering film (3); A felt (5), covering the upper side of the bottom covering film (3); A plurality of anchoring spines (6) arranged around the center of the bottom covering film (3), the anchoring spines (6) passing through the bottom covering film (3) and the felt (5); the lower end of the anchoring spines (6) is buckled on the plum blossom bare stent (4), and the upper end of the anchoring spines (6) extends beyond the felt (5) and has barbs (61) inclined downward; The anchoring spine (6) has a vertical portion (62), and the upper end of the vertical portion (62) has a tip; The lower end of the vertical portion (62) has a first bending portion (63), and one end of the first bending portion (63) away from the vertical portion (62) has a folding-back portion (64); the plum blossom bare stent (4) is buckled in the first bending portion (63); the gap between the folding-back portion (64) and the vertical portion (62) is smaller than the cross-sectional dimension of the plum blossom bare stent (4), for restricting the plum blossom bare stent (4) from disengaging from the first bending portion (63).

2. The branched blood vessel stent according to claim 1, wherein: The barb (61) is arranged on one side of the tip of the vertical portion (62).

3. The branched blood vessel stent according to claim 1, wherein: One end of the folding-back portion (64) away from the first bending portion (63) has a straight segment (65), and the other end of the straight segment (65) has a second bending portion (66), and the second bending portion (66) is attached to the lower side of the bottom covering film (3).

4. The branched blood vessel stent according to claim 3, wherein: The inner side edge of the bottom covering film (3) is fixedly sutured to the lower end of the branched covered main body (1) through a suture, and a radial elongated hole (31) arranged around the center of the bottom covering film (3) is formed on the bottom covering film (3); the vertical portion (62) and the folding-back portion (64) of the anchoring spine (6) are inserted through the elongated hole (31).

5. A branched blood vessel stent according to claim 1, characterized in that: The plum blossom bare stent (4) is bent with evenly distributed rounded corners, and the plum blossom bare stent (4) has an annular multi-pointed star structure; the first bending portion (63) of the vertical portion (62) is buckled at the rounded corner vertex of the plum blossom bare stent (4).

6. The branched blood vessel stent according to claim 1, wherein: The plum blossom bare stent (4) is fixedly sutured to the bottom covering film (3) through a suture.

7. A branched blood vessel stent according to claim 1, characterized in that: The felt (5) is disc-shaped, and small holes for the anchoring spines (6) to pass through are formed on the felt (5) and arranged around the center of the felt (5).

8. A branched blood vessel stent according to claim 1, characterized in that: A plurality of the branched bare stents (2) are fixedly sutured to the outer surface or the inner surface of the branched covered main body (1) at a certain interval through sutures.

9. The branched blood vessel stent according to claim 1, wherein: After the branched blood vessel stent is installed at the branch opening of the main blood vessel, a support ring (7) is used to support in the main blood vessel at the branch opening; the expanded support ring (7) presses the felt (5), the bottom covering film (3) and the plum blossom bare stent (4) against the inner wall of the main blood vessel, and pierces the tip of the anchoring spine (6) into the inner wall of the main blood vessel.

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