Ascending aorta stent

Abstract

The invention discloses an ascending aorta stent, which belongs to the field of medical instruments and comprises a stent bottom, a stent middle and a stent top. A plurality of closable split ring structures are arranged at the connecting ends, connected with the support middle part, of the support bottom part and the support top part, a plurality of connecting parts are arranged at the two ends of the support middle part, and the support middle part is connected with the support bottom part and the support top part through the connection of the connecting parts and the closable split ring structures; the net weaving part in the middle of the support is formed by weaving one silk thread, the connecting parts used for being connected with the top and the bottom of the support are formed at the two ends of the net weaving part, and the closable split ring structures are evenly distributed on the top and the bottom of the support. Compared with an existing method that knitting is directly conducted on the top or the bottom of the support, the efficiency is higher.

Description

Technical Field

[0001] The present invention relates to the field of medical devices, and particularly to an ascending aortic stent. Background Art

[0002] Aortic dissection is a critical acute aortic disease, which refers to the formation of an intimal tear in the aortic intima and part of the media due to various reasons. Blood enters the media through the tear and spreads proximally and distally under pressure, causing partial dissection of the media and forming a new vascular cavity (false lumen) between the intima and the media. If the aortic tear is located in the ascending aorta or aortic arch, and the dissection involves the ascending aorta, it is type A; if the tear is located distal to the left subclavian artery and the dissection is limited to the descending aorta, it is type B. Prophylactic ascending aortic replacement is the main measure to prevent type A dissection. By using an artificial blood vessel to replace the diseased aorta through an elective operation, the risk of type A dissection and mortality are greatly reduced.

[0003] Currently, traditional ascending aortic lesions require open-chest surgery to replace the artificial blood vessel. Therefore, interventional treatment is a more advanced treatment method for aortic diseases. To solve the flexibility of the stent, many interventional treatment stents use products combining a nitinol braid and a nitinol stent to treat aortic diseases. However, the connection method between the braid structure and the stent has not been well solved. Once the connection problem is not handled well, the stent has the risk of puncturing the blood vessel. The existing solution can only be to braid on the processed stent, which not only wastes time but also increases the processing difficulty accordingly. In addition, the stent of the existing product has poor radiopacity, so it is easy to deviate during the release process. Therefore, there is an urgent need for a stent that can solve the above problems. Summary of the Invention

[0004] The present invention provides an ascending aortic stent that can solve at least one of the problems pointed out in the background art.

[0005] An ascending aortic stent includes a stent bottom, a stent middle part, and a stent top; Wherein, at the connection ends of the stent bottom and the stent top connected to the stent middle part, a plurality of closable opening ring structures are provided, and both ends of the stent middle part have a plurality of connecting parts. Through the connection of the connecting parts with the closable opening ring structures, the connection between the stent middle part and the stent bottom and the stent top is realized.

[0006] Preferably, the connection ends of the stent bottom, the stent top and the stent middle part, and both ends of the stent middle part are corrugated.

[0007] Preferably, the connecting part is a ring structure formed by twisting metal wires.

[0008] Preferably, the middle part of the stent is a net structure woven by a metal wire.

[0009] Preferably, both the bottom and the top of the stent include a metal stent, a film, and sutures for fixing the metal stent and the film.

[0010] Preferably, it further includes two groups of developer wires respectively wound around the connection ends at the bottom and the top of the stent, and fixing holes for the developer wires to pass through are provided at the inflection points of the connection ends at the bottom and the top of the stent.

[0011] Preferably, two knots are provided at the position of the developer wire corresponding to any fixing hole, and the two knots are respectively located on both sides of the fixing hole.

[0012] Preferably, a plurality of positioning protrusions are provided on both the connection end at the bottom and the connection end at the top of the stent, and the developer wire is wound between two adjacent positioning protrusions.

[0013] Preferably, it further includes an innominate artery stent, and the innominate artery stent is connected to the top or the bottom of the stent.

[0014] Preferably, an elastic film layer is provided inside the middle part of the stent.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: In the present invention, the netting part in the middle of the stent is woven from a single wire, and a plurality of connection parts for connecting with the top and the bottom of the stent are formed at both ends thereof. The top and the bottom of the stent are evenly distributed with closable open-loop structures. Therefore, after the three parts are processed, they can be finally assembled in sequence from 2:30 of the middle stent, which is more efficient than the existing method of directly weaving on the top or the bottom of the stent; In addition, positioning protrusions are evenly distributed on the top and the bottom of the stent, and fixing holes are provided at the inflection points. The developer wire is wound around the stent and knotted and fixed on both sides of the fixing hole, which can realize the fixation of the developer wire, avoid its displacement, and improve the accuracy of intraoperative release. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of the overall structure of the present invention; Figure 2 is a schematic diagram of the connection between the bottom of the stent and the middle part of the stent; Figure 3 is a partial schematic diagram of the connection between the connection end at the bottom of the stent and the metal wire in the middle part of the stent; Figure 4 is Figure 3 a partial enlarged view of point A of Figure 5 is Figure 3Partial enlarged view at position B; Figure 6 is Figure 3 Partial enlarged view at position C; Figure 7 is Figure 3 Partial enlarged view at position D; Figure 8 Schematic diagram of the structure of the closable open-loop structure and the connecting part; Figure 9 Schematic diagram of the structure of the elastic film layer; Figure 10 Usage state diagram of the present invention; Figure 11 Schematic diagram of the structure of the top of the stent and the innominate artery stent; Figure 12 Schematic diagram of the structure of the connection between the bottom of the stent and the middle of the stent in Embodiment 3; Figure 13 is Figure 12 Partial enlarged view at position E; Figure 14 is Figure 12 Partial enlarged view at position F; Figure 15 is Figure 12 Partial enlarged view at position G; Figure 16 Schematic diagram of the structure of the innominate artery stent.

[0017] Explanation of reference numerals: 1 - Top of the stent, 2 - Middle of the stent, 3 - Bottom of the stent, 4 - Innominate artery stent, 5 - Closable open-loop structure, 6 - Connecting part, 7 - Marking wire, 8 - Positioning protrusion, 9 - Fixing hole, 10 - Knot, 11 - Inflection point, 12 - Elastic film layer, 13 - Metal stent, 14 - Film, 15 - Suture. Detailed description of the specific implementation

[0018] Next, in conjunction with the drawings, a specific implementation of the present invention will be described in detail, but it should be understood that the protection scope of the present invention is not limited by the specific implementation. Embodiment 1

[0019] As Figures 1 to 8 shown, an ascending aorta stent provided by an embodiment of the present invention includes a stent bottom 3, a stent middle 2, and a stent top 1. In addition, it further includes an innominate artery stent 4, and the innominate artery stent 4 is connected to the stent top 1 or the stent bottom 3. In this embodiment, the stent top 1 is taken as an example; Among them, the stent middle 2 in this embodiment is a metal mesh structure. Specifically, it is woven from a single metal wire with shape memory, and there is no breakpoint in the middle; Both the bottom 3 and the top 1 of the stent are metal stent structures; In the prior art, the top 1 and the bottom 3 of the stent are processed first, and then wire meshing is carried out on the bottom 3 or the top 1 of the stent to form the middle part 2 of the stent, which takes a long processing time. Based on this, to improve the efficiency, the connection ends of the top 1 and the bottom 3 of the stent and the middle part 2 of the stent in this embodiment are provided with a closable opening ring structure 5. When the middle part 2 of the stent is wire meshed, a plurality of connecting parts 6 are formed at both ends thereof. The connection between the three is realized through the connection between the connecting part 6 and the closable opening ring structure 5, thereby forming a complete stent structure. After adopting this method, the three can be processed independently and then assembled, thereby improving the processing efficiency. Figure 10 It is a usage state diagram of the ascending aortic stent; The closable opening ring structure 5 has two states. One is the open state before connecting with the middle part 2 of the stent (as Figure 8 shown), and the other is the closed state after connecting with the middle part 2 of the stent (as Figure 5 shown); The connecting part 6 of this embodiment is a ring structure twisted by metal wires. In some other embodiments, the connecting part 6 can also be a ring structure formed by tying knots of metal wires. After the ring structure is sleeved on the closable opening ring structure 5 in the open state, the state change from state one to state two can be realized by pressing the closable opening ring structure 5. Of course, tools can also be used for auxiliary assembly to complete the connection between the middle part 2 of the stent and the top 1 and the bottom; In addition, in some other embodiments, in order to increase the contact area between the middle part 2 of the stent and the top 1 and the bottom, the connection ends of the bottom 3, the top 1 of the stent and the middle part 2 and both ends of the middle part 2 of the stent are corrugated, specifically as Figure 2 shown. After increasing the contact area, the connection strength between the three can be effectively increased; In some other embodiments, as Figure 9 shown, an elastic film material, namely an elastic film layer 12, with excellent elastic properties is provided inside the wire mesh of the middle part 2 of the stent. The elastic film layer material can be selected as polytetrafluoroethylene, which can block the outflow of blood and can deform with the deformation of the ascending aortic stent. Both ends of the elastic film layer are respectively connected to the top 1 and the bottom 3 of the stent; Embodiment Two

[0020] In the prior art, some ascending aortic stents achieve the imaging effect by setting imaging points, and the outline of the whole stent cannot achieve the imaging effect. Based on this, as Figures 3 to 8 shown, this embodiment proposes an ascending aortic stent. On the basis of Embodiment One, it includes two groups of imaging wires 7 respectively wound around the connection ends of the bottom 3 of the stent and the connection ends of the top 1 of the stent; The overall developing line 7 of this embodiment is an annular structure, so as to realize the development of the overall approximate contour of the stent. In addition, as Figure 4 shown, a plurality of positioning protrusions 8 are provided on both the connecting end of the bottom 3 of the stent and the connecting end of the top 1 of the stent. The developing line 7 is wound between two adjacent positioning protrusions 8, which can make the developing line 7 evenly distributed; In addition, as Figure 6 and Figure 7 shown, in order to further limit the developing line 7 on the basis of the winding method, fixing holes 9 for allowing the developing line to pass through are provided at the inflection points 11 of the connecting end of the bottom 3 of the stent and the connecting end of the top 1 of the stent. In addition, in order to prevent the developing line 7 from shifting, two knots 10 are provided at the position of the developing line 7 corresponding to any fixing hole 9 (that is, the developing line 7 passes through the hole position of the inflection point 11 of the stent and is knotted and locked on both sides of the hole). The two knots 10 are respectively located on both sides of the fixing hole 9, so as to ensure that the position of the developing line 7 will not change randomly and improve the accuracy of intraoperative release. Embodiment Three

[0021] On the basis of Embodiment One, this embodiment proposes an ascending aortic stent. As Figure 11 shown, both the top 1 and the bottom 3 of the stent include a metal stent 13 and a film 14. The film 14 is connected to the metal stent 13 through a suture 15 or a suture cord. In this embodiment, the suture 15 is taken as an example. Specifically, the suture 15 winds around the metal stent 13 and alternately passes above or below the film 14 multiple times, so as to complete the suture and fixation of the two; As Figure 12 shown, in addition, in order to realize the connection between the top 1, the bottom 3 and the middle 2 of the stent, the suture 15 can be used to replace the closable opening ring structure 5. First, as Figure 14 and Figure 15 shown, fixing holes 9 are provided at the inflection points 11 on the metal stent. The suture passes through the fixing holes 9 and is knotted to realize the fixation of the metal stent and the suture. In addition, as Figure 13 shown, when the suture passes through the connecting part 6, it passes through the annular structure of the connecting part 6 and then winds around the metal stent and is knotted and fixed, so as to realize the fixed connection between the top 1, the bottom 3 and the middle 2 of the stent; In addition, in order to prevent the middle 2 of the stent from circumferentially moving relative to the top 1 or the bottom 3 of the stent, a plurality of positioning protrusions 8 are provided on the metal stent, and the knotting position is between the two positioning protrusions 8, effectively avoiding the loosening of the knotting position; The film 14 of this embodiment is a cylindrical structure, which can be located inside or outside the metal stent 13. The top 1 and the bottom 3 of the stent in this embodiment take the outside as an example; In some other embodiments, as Figure 16As shown, the innominate artery stent also includes a metal stent 13, a membrane 14, and sutures 15 for fixing the two. The membrane 14 is located inside the metal stent 13.

[0022] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit and basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be construed as limiting the claimed invention.

[0023] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An ascending aortic stent, characterized in that, It includes a stent bottom, a stent middle part, and a stent top part; Among them, both connection ends of the stent bottom and the stent top part connected to the stent middle part are provided with a number of closable opening ring structures, and both ends of the stent middle part have a number of connection parts. Through the connection of the connection parts with the closable opening ring structures, the connection between the stent middle part and the stent bottom and the stent top part is realized.

2. The ascending aorta stent according to claim 1, characterized in that The connection ends of the stent bottom, the stent top part and the stent middle part, and both ends of the stent middle part are corrugated.

3. The ascending aorta stent according to claim 1, characterized in that The connection part is an annular structure twisted by metal wires.

4. The ascending aortic stent according to claim 1, wherein The stent middle part is a mesh structure woven by a metal wire.

5. The ascending aorta stent according to claim 1, characterized in that Both the stent bottom and the stent top part include a metal stent, a film, and a suture for fixing the metal stent and the film.

6. The ascending aorta stent according to claim 1, wherein, It also includes two groups of developer wires respectively wound around the connection ends of the stent bottom and the stent top part. Fixing holes for allowing the developer wires to pass through are provided at the inflection points of the connection ends of the stent bottom and the stent top part.

7. The ascending aortic stent according to claim 6, characterized in that, Two knots are provided at the position of the developer wire corresponding to any fixing hole, and the two knots are respectively located on both sides of the fixing hole.

8. The ascending aorta stent according to claim 6, characterized in that A plurality of positioning protrusions are provided on both the connection ends of the stent bottom and the connection ends of the stent top part, and the developer wire is wound between adjacent two positioning protrusions.

9. The ascending aorta stent according to claim 1, characterized in that, It also includes an innominate artery stent, and the innominate artery stent is connected to the stent top part or the stent bottom part.

10. The ascending aortic stent according to claim 1, wherein An elastic film layer is provided inside the stent middle part.

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