CN216257646U - Artificial heart valve stent with high ductility - Google Patents

Abstract

The utility model discloses a high-ductility artificial heart valve stent, which adopts a unique grid structure formed by respectively surrounding and connecting a first hexagonal unit and a second hexagonal unit up and down, compared with the artificial heart valve stent with a diamond-shaped unit grid structure in the prior art, the artificial heart valve stent with the same size has the advantages of less grids, less materials, good ductility, small radial resistance and low elastic retraction rate when used as a balloon expandable stent for expansion, and is easier to compress and expand when used as a self-expandable stent; the local bending design of the circular convex part and the circular groove part in each hexagonal unit not only facilitates the rotation and displacement of each rib in the grid, enables the whole body to be easy to deform, further enhances the ductility, but also plays a role in limiting the wound suture; the design that the longitudinal sides are bent in the second hexagonal unit plays a spring-like role, and the stress is absorbed in the axial direction during compression and expansion, and the length compensation is carried out, so that the uniform grid of the completely expanded stent is ensured.

Description

Artificial heart valve stent with high ductility

Technical Field

The utility model relates to the technical field of medical instruments, in particular to a heart valve prosthesis bracket with strong ductility.

Background

With the development trend of the aging society of China, the incidence rate of senile valve degenerative diseases is continuously increased, wherein aortic stenosis gradually becomes the most common valvular heart disease of the population. For patients with severe aortic stenosis, surgical aortic valve replacement was the only treatment to prolong life, but older patients often have contraindications for surgery due to their advanced age, poor health, severe disease, or other complications. Statistics in developed countries indicate that about 1/3 patients with severe aortic stenosis cannot receive traditional open chest surgery because of high surgical risk or contraindications. For these high-risk or cardiac surgery contraindications, transcatheter aortic valve placement can now be an effective treatment.

Transcatheter aortic valve placement (TAVI), or Transcatheter Aortic Valve Replacement (TAVR), is delivered into an interventional catheter through the femoral artery, and the prosthetic heart valve is delivered to the aortic valve area to be opened, thereby completing prosthetic valve placement, recovering valve function, and the operation does not need to be thoracotomy, thus having small trauma and fast postoperative recovery. Since Alain Cribiier professor completes the first TAVI operation in France in 2002, the technology obtains rapid development in European and American countries, and TAVI is rapidly developed in China in recent years, so that domestic original instruments and experience of Chinese surgeons are important forces with great influence on international stages.

The main instrument of transcatheter aortic valve placement is the prosthetic aortic valve, which is usually composed of a stent and a prosthetic valve. Stents can be divided into two main categories according to different expansion modes: the balloon expandable stent and the self-expandable stent both need to have excellent physical properties to meet the severe use requirements of a human body, such as radial mechanical properties, fatigue resistance and the like. Most of artificial aortic valve stents in the prior art are of an annular structure formed by surrounding grid units, the improvement of the physical properties of the stent is mainly from the research, development and innovation of application materials, and the design of the grid structure is considered to improve the extensibility of the artificial aortic valve stent so as to obtain better use effect.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, the utility model provides a heart valve prosthesis support with strong ductility.

In order to achieve the purpose, the technical scheme adopted by the utility model for solving the technical problems is as follows: the utility model provides a prosthetic heart valve support that ductility is strong, is the cylindrical surface form, and the surface fretwork forms a plurality of grids, including nearly heart-end and telecentric end, nearly heart-end is connected gradually by a plurality of first hexagonal units and encircles and form, telecentric end is connected gradually by a plurality of second hexagonal units and encircles and form, first hexagonal unit and second hexagonal unit are all about self cross axle and axis of ordinates symmetry to have a pair of relative summit and be located self axis of ordinates, adjacent two first hexagonal unit is with adjacent two all share the longitudinal side between the second hexagonal unit, arbitrary hypotenuse on the first hexagonal unit with arbitrary hypotenuse length is unanimous on the second hexagonal unit, a plurality of first hexagonal unit and a plurality of second hexagonal unit corresponds from top to bottom and the summit links to each other, in first hexagonal unit and the second hexagonal unit, the upper vertex and the lower vertex are both outwards bent and protruded to form circular convex parts, one end of each bevel edge is connected with a longitudinal edge, the longitudinal edge is inwards bent and sunken to enable the connection parts of the two adjacent bevel edges at the same end of the longitudinal edge to form circular groove parts, and the longitudinal edge of the second hexagonal unit is bent.

Preferably, the round convex part and the round groove part are consistent in shape and size.

Preferably, the number of the first hexagonal cells is 3 times as many.

Preferably, three longitudinal sides of the first hexagonal unit on the proximal end are widened and provided with connecting holes, and the three longitudinal sides of the widened first hexagonal unit circumferentially trisect the proximal end.

Preferably, the longitudinal sides of the second hexagonal unit are regularly wavy.

Due to the application of the technical scheme, compared with the prior art, the utility model has the following beneficial effects:

1. compared with the artificial heart valve stent with a rhombic unit grid structure in the prior art, the artificial heart valve stent has the advantages that the number of grids is small under the same size, the material consumption is reduced, the ductility is good, the radial resistance is small when the artificial heart valve stent is used as a balloon expansion type stent for expansion, the elastic retraction rate is low, and the artificial heart valve stent is easier to compress and expand when the artificial heart valve stent is used as a self-expansion type stent;

2. the local bending design of the circular convex part and the circular groove part in each hexagonal unit not only facilitates the rotation and displacement of each rib in the grid, enables the whole body to be easy to deform, further enhances the ductility, but also plays a role in limiting the wound suture;

3. the design that the longitudinal sides are bent in the second hexagonal unit plays a spring-like role, and the stress is absorbed in the axial direction during compression and expansion, and the length compensation is carried out, so that the uniform grid of the completely expanded stent is ensured.

Drawings

Fig. 1 is a perspective view of an embodiment of a malleable prosthetic heart valve stent according to the present invention.

Fig. 2 is an enlarged schematic view of a portion a in fig. 1.

Fig. 3 is an enlarged schematic view of a portion B in fig. 1.

Fig. 4 is an enlarged schematic view of the portion C in fig. 1.

FIG. 5 is a compressed, collapsed perspective view of an embodiment of a malleable prosthetic heart valve stent in accordance with the present invention.

In the figure: 1. a proximal end; 2. a distal end; 3. a first hexagonal cell; 4. a second hexagonal cell; 5. a rounded convex portion; 6. a round slot part; 7. and connecting the holes.

Detailed Description

The present invention will be further described in detail with reference to the following specific examples:

the embodiment is a prosthetic heart valve stent with strong ductility, which is mainly applied to transcatheter aortic valve implantation and is used for fixing a prosthetic valve during the transcatheter aortic valve implantation, and the stent is automatically expanded from the position where the interventional catheter enters the aortic valve of a human body or is expanded by a balloon in a contracted and contracted state to complete the implantation of the prosthetic aortic valve, so that the valve function is recovered. With reference to fig. 1 to 4, in this embodiment, the expanded or expanded state is cylindrical, the surface of the expanded or expanded state is hollowed to form a plurality of grids, including a proximal end 1 and a distal end 2, the proximal end 1 is formed by sequentially connecting and surrounding a plurality of first hexagonal units 3, the distal end 2 is formed by sequentially connecting and surrounding a plurality of second hexagonal units 4, the first hexagonal units 3 and the second hexagonal units 4 are symmetrical about a lateral axis and a longitudinal axis thereof, and have a pair of opposite vertices located on the longitudinal axis thereof, a longitudinal edge is shared between two adjacent first hexagonal units 3 and between two adjacent second hexagonal units 4, any bevel edge on the first hexagonal unit 3 is the same as any bevel edge on the second hexagonal unit 4, the plurality of first hexagonal units 3 and the plurality of second hexagonal units 4 are in one-to-up-down correspondence and connected with each other vertex, and in the first hexagonal units 3 and the second hexagonal units 4, the upper and lower two vertexes are all outwards bent and protruded to form circular convex parts 5, one end of each bevel edge is connected with a longitudinal edge and is inwards bent and sunken to enable the connection parts of the two adjacent bevel edges at the same end of the longitudinal edge to form circular groove parts 6, and the longitudinal edges of the second hexagonal units 4 are bent.

Wherein, the shape and the size of the round convex part 5 and the round groove part 6 are consistent; the number of the first hexagonal unit 3 is 3 times (12 or 15 in practical application); three longitudinal edges of the first hexagonal unit 3 on the proximal end 1 are widened and provided with connecting holes 7, the proximal end 1 is circumferentially trisected by the three longitudinal edges of the widened first hexagonal unit 3, and the connecting holes 7 are used for passing sutures to connect and fix the embodiment with native valve tissues, artificial valves and other accessories; the longitudinal edges of the second hexagonal unit 4 are regular waves, the undulation intervals are equal, and the bending shapes are consistent.

In this embodiment, the number of the first hexagonal unit 3 and the number of the second hexagonal unit 4 are equal to 12, and the shape and the size of the upper end and the lower end are completely consistent except for the inconsistency of the middle pair of longitudinal edges, so that a circle of 12 diamond-shaped units connected in a surrounding manner is formed between the proximal end 1 and the distal end 2 connected up and down. With reference to fig. 1 to 5, when the present embodiment is compressed and contracted, each cell is shortened in the transverse direction and lengthened in the longitudinal direction, two sides of each hexagonal cell are parallel and adjacent to form a gap, and each round protrusion 5 and each round groove 6 are the bending connection point of each rib.

The utility model has the beneficial effects that: compared with the artificial heart valve stent with a rhombic unit grid structure in the prior art, the special mesh structure formed by respectively surrounding the first hexagonal unit 3 and the second hexagonal unit 4 and connecting the first hexagonal unit and the second hexagonal unit up and down is adopted, so that the special artificial heart valve stent has the advantages of less meshes under the same size, less material consumption, good ductility, small radial resistance and low elastic retraction rate when used as a balloon expandable stent for expansion, and is easier to compress and expand when used as a self-expandable stent; the local bending design of the round convex part 5 and the round groove part 6 in each hexagonal unit not only facilitates the rotation and displacement of each rib in the grid, makes the whole easy to deform, further enhances the ductility, but also plays a role in limiting the thread winding; the design that the longitudinal sides are bent in the second hexagonal unit 4 plays a spring-like role, and the stress is absorbed in the axial direction during compression and expansion, and the length compensation is performed, so that the uniform grid of the completely expanded stent is ensured.

The above-mentioned embodiments are merely illustrative of the technical idea and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be covered in the scope of the present invention.

Claims (5)

1. A heart valve prosthesis stent with strong ductility is characterized in that: be the cylindricality form, surface fretwork forms a plurality of grids, including nearly heart end (1) and telecentric end (2), nearly heart end (1) is connected gradually by a plurality of first hexagonal unit (3) and encircles and form, telecentric end (2) is connected gradually by a plurality of second hexagonal unit (4) and encircles and form, first hexagonal unit (3) and second hexagonal unit (4) are all about self cross axle and axis of ordinates symmetry to it is located self axis of ordinates to have a pair of relative summit, adjacent two between first hexagonal unit (3) and adjacent two all share the longitudinal edge between second hexagonal unit (4), arbitrary hypotenuse on first hexagonal unit (3) with arbitrary length is unanimous on second hexagonal unit (4), a plurality of first hexagonal unit (3) and a plurality of second hexagonal unit (4) one-to-one-up-down and the summit links to each other, in first hexagon unit (3) and second hexagon unit (4), two apex department all form round convex part (5) towards outer bending protrusion from top to bottom, connect on each hypotenuse and indulge limit one end all inwards bend sunken making two adjacent hypotenuses junctions of the same end of vertical limit form circular slot portion (6), second hexagon unit (4) vertical limit is crooked form.

2. The strong ductility prosthetic heart valve stent as claimed in claim 1, wherein: the shape and the size of the round convex part (5) and the round groove part (6) are consistent.

3. The strong ductility prosthetic heart valve stent as claimed in claim 1, wherein: the number of the first hexagonal cells (3) is 3 times as many.

4. The malleable prosthetic heart valve stent of claim 3, wherein: three first hexagonal units (3) are arranged on the proximal end (1), the longitudinal sides of the first hexagonal units are widened and provided with connecting holes (7), and the proximal end (1) is circumferentially trisected by the three widened first hexagonal units (3).

5. The strong ductility prosthetic heart valve stent as claimed in claim 1, wherein: the longitudinal sides of the second hexagonal units (4) are regular wave-shaped.

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