Stable Anti-displacement heart stent

Abstract

The present invention relates to the technical field of medical instruments, in particular to a stable anti-displacement heart stent. The heart stent comprises a plurality of groups of elliptical rings that are uniformly distributed, the plurality of groups of elliptical rings being all located on the same center line; each of said groups comprises three elliptical rings which are circumferentially and equally spaced; in the direction of the center line, a spiral rod is fixedly connected between each two adjacent elliptical rings, the spiral rods and the elliptical rings being staggered in the direction of the center line; first arc-shaped rods are fixedly connected between adjacent elliptical rings that are located at the two ends of the center line; and all the elliptical rings, the spiral rods and the first arc-shaped rods cooperate to form a cylindrical stent. By means of the triangular distribution of the elliptical rings, the present invention improves the structural stability of the heart stent; and by means of the staggered elliptical rings, the present invention further improves the stability between the cylindrical stent and the coronary artery after deployment, and improves anti-displacement performance of the cylindrical stent.

Description

A stable anti-displacement heart stent Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a stable anti-displacement heart stent. Background Art

[0002] A heart stent is a medical device that supports the coronary arteries to ensure the normal circulation of blood in the coronary arteries. The implantation of a heart stent is an effective means of treating coronary heart disease. Existing heart stents are often medical devices that combine a stent and a delivery mechanism. During the use of a heart stent, the existing delivery mechanism on the heart stent is often used to deliver the stent to a designated part of the coronary artery, and then the stent is expanded to support the coronary artery. However, since the thickness of the stent is basically the same, during the stent expansion process, the stent is very likely to deform at the connection, and the degree of deformation at the stent connection is difficult to control, which can easily lead to uneven deformation, affecting the stent's support effect on the coronary artery, thereby resulting in poor therapeutic effect of the heart stent.

[0003] In view of this, the present invention discloses a stable anti-displacement heart stent. Summary of the Invention

[0004] In order to overcome the problems mentioned in the above background technology, the present invention provides a stable anti-displacement heart stent.

[0005] The technical solution of the present invention is: a stable anti-displacement heart stent, including multiple groups of evenly distributed elliptical rings, the multiple groups of elliptical rings are all located on the same center line, each group of elliptical rings includes three circumferentially equidistantly distributed elliptical rings, a spiral rod is fixed between two adjacent elliptical rings in the direction of the center line, the spiral rod and the elliptical ring are staggered in the direction of the center line, a first arc rod is fixed between the adjacent elliptical rings at both ends of the center line, all the elliptical rings, the spiral rods and the first arc rod cooperate to form a cylindrical stent, the cylindrical stent is installed with a conveying mechanism, and the conveying mechanism is used to squeeze the cylindrical stent to expand.

[0006] Preferably, two adjacent groups of elliptical rings are staggered, so that the outer side wall of the cylindrical bracket is wavy in the direction of the center line.

[0007] Preferably, the facing sides of each group of elliptical rings are provided with inclined surfaces, and the inclined surfaces are used to reduce the obstruction of the corresponding elliptical rings to the blood. The opposite sides of each group of elliptical rings are provided with evenly distributed grooves.

[0008] Preferably, the spiral rod is provided with a spindle-shaped hole for adapting to the deformation of the spiral rod, and both ends of the spindle-shaped hole are rounded for improving the strength of the spiral rod.

[0009] Preferably, the conveying mechanism includes a propulsion tube, which is arranged in the middle of the cylindrical bracket, an air guide tube is fixedly connected to the inside of the propulsion tube, a guide wire is slidably arranged in the middle of the air guide tube, the outer side surface of the propulsion tube is provided with evenly distributed partition plates, the partition plates are provided with through holes equidistantly distributed circumferentially, an airbag is fixedly connected to the outer side surface of the propulsion tube, the airbag is sleeved on the outer side of the partition plate, and the airbag is adhered to the partition plate, the outer side of the airbag fits with the cylindrical bracket, the side walls of the propulsion tube and the side walls of the air guide tube are both provided with circular holes equidistantly distributed circumferentially, the circular holes on the air guide tube are connected to the adjacent circular holes on the propulsion tube, and the circular hole of the propulsion tube is located in the middle of the airbag.

[0010] Preferably, it also includes an auxiliary deformation mechanism for controlling each group of the elliptical rings to expand accordingly, the auxiliary deformation mechanism is arranged on the cylindrical bracket, the auxiliary deformation mechanism includes a plurality of evenly distributed groups of second arc rods, each group of the second arc rods includes six circumferentially equidistantly distributed groups of the second arc rods, and the plurality of groups of the second arc rods are respectively arranged on adjacent single groups of the elliptical rings, and the second arc rods are fixedly connected to the corresponding elliptical rings, and two adjacent groups of the second arc rods are respectively arranged on two spaced groups of the elliptical rings, and a limiting rod is fixed between the adjacent second arc rods in the same group, and the limiting rods are fixed with connecting rods at both ends in the center line direction, and the connecting rods are fixed to the adjacent elliptical rings, and the elliptical rings are provided with a plurality of evenly distributed groups of limiting components, and the limiting components are located between the two groups of the elliptical rings connected to the second arc rods, and each group of the limiting components is used to limit the elliptical ring after expansion.

[0011] Preferably, the cross section of the second arc-shaped rod gradually becomes smaller from both ends to the middle, and the limiting rod and two adjacent second arc-shaped rods cooperate to form a Z shape.

[0012] Preferably, the thickness of the major axis end of the elliptical ring is greater than the thickness of the minor axis end thereof, so as to reduce its deformation in the direction of the center line.

[0013] Preferably, the limiting assembly includes three first fixing plates equidistantly distributed in the circumferential direction, the three first fixing plates are respectively fixed to adjacent elliptical rings, the elliptical ring close to the first fixing plate in the direction of the center line is fixed with a second fixing rod, the first fixing plate is provided with an arc-shaped hook, and the second fixing rod is provided with a groove that cooperates with the arc-shaped hook on the adjacent first fixing plate.

[0014] Preferably, it also includes a contraction mechanism for contracting the airbag in the direction of the center line, the contraction mechanism is arranged on the air guide tube, the partition plate is slidably connected to the propulsion tube, the contraction mechanism includes symmetrically distributed and equidistant rubber rings, the symmetrically distributed and equidistant rubber rings are respectively fixed to adjacent said partition plates, some of the through holes of the partition plates are fixed with partition membranes, and sliding frames are provided in the remaining through holes of the partition plates for common sliding, an elastic member is installed between the sliding frame and the adjacent said partition plates, the sliding frame is provided with a cylindrical rod that cooperates with the adjacent said partition membranes, and elastic strips distributed circumferentially and equidistantly are fixed between adjacent said partition plates, the elastic strips are fixed to the airbags, and the elastic coefficient of the elastic strips is greater than the elastic coefficient of the airbags.

[0015] Compared with the prior art, the technical effect achieved by the present invention is as follows: the present invention improves the stability of the cylindrical stent composed of all elliptical rings, spiral rods and the first arc rod through the triangular distribution of elliptical rings, makes the outer side of the cylindrical stent present a wavy line through the staggered distribution of elliptical rings, further improves the stability between the cylindrical stent and the coronary artery after expansion, and at the same time improves the anti-displacement property of the cylindrical stent, improves the flexibility of the spiral rod through the shuttle hole, weakens the deformation between the spiral rod and the adjacent elliptical rings, and ensures the strength of the cylindrical stent, and through the connection effect of the adjacent second arc rods, limit rods and connecting rods in the auxiliary deformation mechanism, the adjacent elliptical rings are uniformly contracted after expansion, further improving the use stability and self-strength of the device, and then cooperates with the locking cooperation of the first fixed plate and the second fixed rod of the limit assembly to improve the stability of the cylindrical stent after expansion, and through the limiting effect of the elastic strip and the partition membrane in the contraction mechanism, the auxiliary partition plate moves, thereby further ensuring the synchronous contraction of all elliptical rings and spiral rods, thereby improving the stability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] FIG1 is a schematic diagram of the three-dimensional structure of the present invention;

[0017] FIG2 is a schematic diagram of the planar structure of the present invention after being unfolded;

[0018] FIG3 is a schematic diagram of the three-dimensional structure of the elliptical ring and the spiral rod of the present invention;

[0019] FIG4 is a cross-sectional view of the components of the elliptical ring of the present invention;

[0020] FIG5 is a cross-sectional view of the conveying mechanism of the present invention;

[0021] FIG6 is a schematic diagram of the three-dimensional structure of the auxiliary deformation mechanism of the present invention;

[0022] FIG7 is a cross-sectional view of the retraction mechanism of the present invention.

[0023] In the accompanying drawings: 1-elliptical ring, 2-spiral rod, 21-first arc rod, 3-inclined surface, 4-fusiform hole, 5-propelling tube, 51-air guide tube, 52-guide wire, 53-partitioning plate, 54-airbag, 6-second arc rod, 61-limiting rod, 62-connecting rod, 7-first fixing plate, 71-second fixing rod, 8-rubber ring, 81-partitioning membrane, 82-sliding frame, 83-elastic strip. DETAILED DESCRIPTION

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings in the following description only relate to some embodiments of the present invention, but are not intended to limit the present invention.

[0025] Example 1: A stable anti-displacement heart stent, as shown in Figures 1 to 4, includes multiple groups of evenly distributed elliptical rings 1, multiple groups of elliptical rings 1 are located on the same center line, each group of elliptical rings 1 includes three circumferentially equidistantly distributed, forming a triangular structure, improving the structural stability of the device, a spiral rod 2 is fixed between two adjacent elliptical rings 1 in the horizontal direction, the spiral rods 2 are staggered to form a staggered grid, the spiral rods 2 and the elliptical rings 1 are staggered in the horizontal direction, and a first arc rod 21 is fixed between each group of elliptical rings 1 at the left and right ends, which is equidistantly distributed in the vertical direction. All the elliptical rings 1, the spiral rods 2 and the first arc rod 21 cooperate to form a cylindrical stent, and the space between the two adjacent groups of elliptical rings 1 is 1 / 4. The elliptical rings 1 are staggered so that the outer wall of the cylindrical stent is wavy in the horizontal direction, which is used to improve the firmness between the cylindrical stent and the coronary artery after expansion. The opposite sides of each group of elliptical rings 1 are provided with inclined surfaces 3, which are used to reduce the obstruction of the corresponding elliptical rings 1 to the blood. At the same time, under the action of blood flow, the firmness between the cylindrical stent and the coronary artery is further improved. The opposite sides of each group of elliptical rings 1 are provided with evenly distributed grooves. The grooves on the elliptical rings 1 are used to store drugs and extend the efficacy of the drugs. The spiral rod 2 is provided with a fusiform hole 4 to adapt to the deformation of the spiral rod 2. The two ends of the fusiform hole 4 are rounded to improve the strength of the spiral rod 2. The cylindrical stent is equipped with a conveying mechanism for squeezing the cylindrical stent to expand.

[0026] As shown in Figures 1, 5 and 7, the conveying mechanism includes a propulsion tube 5, which is arranged in the middle of the cylindrical bracket. An air guide tube 51 is fixedly connected to the inside of the propulsion tube 5, and the air guide tube 51 is connected to the existing inflation mechanism. A guide wire 52 is slidingly provided in the middle of the air guide tube 51. The guide wire 52 is used to guide the propulsion tube 5 to a specified position. The outer side of the propulsion tube 5 is provided with eight evenly distributed partition plates 53. The side wall of the partition plate 53 is provided with through holes distributed equidistantly in the circumferential direction. The outer side of the propulsion tube 5 is fixedly connected to the air guide tube 5. There is an airbag 54 adhered to the partition plate 53, and the outer side of the airbag 54 is in contact with the cylindrical bracket. The side walls of the propulsion tube 5 and the side walls of the air guide tube 51 are provided with circular holes equidistantly distributed in the circumferential direction. The circular holes on the air guide tube 51 are connected to the circular holes on the adjacent propulsion tube 5. The circular hole of the propulsion tube 5 is located in the middle of the airbag 54. As the gas is continuously injected into the air guide tube 51, the gas gradually enters the middle of the airbag 54 through flow, and is subsequently limited by the partition plate 53, causing the airbag 54 to gradually expand from the middle to both ends.

[0027] In the present invention, the cylindrical stent composed of all the elliptical rings 1, the spiral rod 2 and the first arc rod 21 is an integrated structure. The cylindrical stent is carved out in one piece by an existing laser cutting machine. After the cylindrical stent is manufactured, it is put on the outside of the airbag 54. At the same time, since the outer side surfaces of all the elliptical rings 1 are provided with evenly distributed grooves, it is convenient to subsequently evenly apply the medicine to the outer side surfaces of all the elliptical rings 1. The grooves of the elliptical rings 1 store the medicine, which facilitates the medicine to stay in the lesions of the coronary artery for a long time, thereby prolonging the efficacy of the medicine.

[0028] When using this device, the cylindrical stent is moved to the designated position by the guiding action of the guide wire 52, and then the existing inflation mechanism is used to fill the airway tube 51 with gas. The gas enters the airbag 54 through the circular holes of the airway tube 51 and the circular holes of the propulsion tube 5. The gas entering the airbag 54 is limited by the partition plate 53, and slowly passes through the circular holes on the partition plate 53, causing the airbag 54 to gradually expand from the middle to both ends. The expansion of the airbag 54 squeezes the cylindrical stent, and the cylindrical stent expands due to the squeezing. The expanded cylindrical stent is tightly attached to the lesion of the coronary artery.

[0029] During the expansion of all the elliptical rings 1, the two adjacent elliptical rings 1 pull the spiral rod 2 to bend. Since the spiral rod 2 is provided with a fusiform hole 4, the thickness of the middle side wall of the spiral rod 2 is thinner than the connection between its two ends and the adjacent elliptical rings 1, which facilitates the deformation of the middle part of the spiral rod 2 when it bends, maintaining the stability of the grid formed by all the elliptical rings 1 and the spiral rod 2, thereby improving the stability of the cylindrical stent after expansion. At the same time, since all the elliptical rings 1 and the spiral rod 2 are staggered, the outer side surface of the cylindrical stent is a wavy line, so that the cylindrical stent contacts the coronary artery in a wavy manner after expansion. Through multiple limit fixations at the wave crest, the firmness between the cylindrical stent and the coronary artery is greatly improved, and the cylindrical stent is prevented from displacement in the coronary artery.

[0030] After the installation is completed, the air bag 54 is deflated and reset by the existing inflation mechanism, and then the connected parts such as the propulsion tube 5 are taken out.

[0031] Example 2: On the basis of Example 1, as shown in Figures 2 and 6, an auxiliary deformation mechanism is also included. The auxiliary deformation mechanism is arranged on the cylindrical bracket. The auxiliary deformation mechanism is used to control each group of elliptical rings 1 to expand accordingly. The auxiliary deformation mechanism includes multiple groups of evenly distributed second arc rods 6. Each group of second arc rods 6 includes six circumferentially equidistantly distributed second arc rods 6. Multiple groups of second arc rods 6 are respectively arranged on adjacent single groups of elliptical rings 1, and the second arc rods 6 are fixedly connected to the corresponding elliptical rings 1. Two adjacent groups of second arc rods 6 are respectively arranged on two groups of elliptical rings 1 spaced apart. A limiting rod 61 is fixed between the adjacent second arc rods 6 in the vertical direction. The limiting rod 61 is fixedly connected to a connecting rod 62 at both ends in the horizontal direction. The rod 62 is fixedly connected to the adjacent elliptical ring 1, and the cross-section of the second arc rod 6 gradually becomes smaller from both ends to the middle, and the limiting rod 61 and the two adjacent second arc rods 6 cooperate to form a Z shape. Through the shape of the second arc rod 6, when the elliptical ring 1 expands in the vertical direction, the elliptical ring 1 in the horizontal direction contracts accordingly under the limiting action of the limiting rod 61 and the second arc rod 6, thereby improving the structural stability of the cylindrical bracket after expansion. The elliptical ring 1 is provided with multiple groups of evenly distributed limiting components, and the limiting components are located between the two groups of elliptical rings 1 connected to the second arc rod 6. Each group of limiting components is used to limit the expanded elliptical ring 1. The thickness of the long axis end of the elliptical ring 1 is greater than the thickness of its short axis end, which is used to reduce its deformation in the horizontal direction.

[0032] As shown in Figures 2 and 6, the limiting assembly includes three first fixing plates 7 that are equidistantly distributed in the circumferential direction. The three first fixing plates 7 are respectively fixed to adjacent elliptical rings 1. The elliptical ring 1 close to the first fixing plate 7 in the horizontal direction is fixed with a second fixing rod 71. The first fixing plate 7 is provided with two symmetrically distributed arc hooks, and the second fixing rod 71 is provided with two symmetrically distributed grooves. The grooves of the second fixing rod 71 cooperate with the arc hooks on the adjacent first fixing plate 7. When the elliptical ring 1 contracts and moves in the horizontal direction, the second fixing rod 71 cooperates with the adjacent first fixing plate 7 to limit the moved elliptical ring 1, so that the expanded elliptical ring 1 maintains the corresponding state, further improving the stability of the device.

[0033] During the installation of the cylindrical bracket, as the airbag 54 expands, the airbag 54 squeezes the entire elliptical ring 1 to expand, wherein the expansion of the elliptical ring 1 pulls the adjacent limit rod 61 through the adjacent second arc rod 6, wherein since the cross-section of the second arc rod 6 gradually increases from the middle to the two ends, and the cross-section of the limit rod 61 is larger than the cross-section of the second arc rod 6, during the movement of the second arc rod 6, the middle part of the second arc rod 6 bends accordingly, and at the same time, the two adjacent second arc rods 6 pull the adjacent limit rod 61 to rotate, and the rotation of the limit rod 61 pulls the two adjacent elliptical rings 1 to move through the adjacent connecting rod 62.

[0034] Because the cross-sectional thickness of the long axis end of the elliptical ring 1 is greater than the cross-sectional thickness of the short axis end, the deformation of the elliptical ring 1 in the horizontal direction is weakened. During the rotation of the limit rod 61, the limit rod 61 pulls the two adjacent elliptical rings 1 closer together through the adjacent connecting rod 62, that is, the elliptical rings 1 in the horizontal direction are closer together. During this process, the elliptical ring 1 connected to the first fixing plate 7 and the second fixing rod 71 respectively moves, so that the first fixing plate 7 and the adjacent second fixing rod 71 are closer together. At this time, the movement of the second fixing rod 71 will squeeze the arc-shaped hook of the adjacent first fixing plate 7 until the second fixing rod 71 is completely inserted into the adjacent first fixing plate 7, completing the locking of the second fixing rod 71 and the adjacent first fixing plate 7, and limiting and locking the expanded elliptical ring 1, further improving the stability of the expanded elliptical ring 1, ensuring that the elliptical ring 1 is always close to the coronary artery, and improving the reliability and stability of the device.

[0035] Embodiment 3: Based on embodiment 2, as shown in Figures 5 and 7, it also includes a contraction mechanism, which is arranged on the air guide tube 51, and the partition plate 53 is slidably connected to the propulsion tube 5. The contraction mechanism is used to contract the airbag 54 in the center line direction. The contraction mechanism includes eight rubber rings 8 that are symmetrically and equidistantly distributed. The eight rubber rings 8 are respectively fixed to adjacent partition plates 53, wherein the four rubber rings 8 on the left are respectively located on the left sides of the four partition plates 53 on the left, and the four rubber rings 8 on the right are respectively located on the right sides of the four partition plates 53 on the right. Part of the through holes of the partition plates 53 are fixed with partition membranes 81, and the remaining through holes of the partition plates 53 are slidably provided with sliding racks 82. The four sliding racks 82 on the left are respectively located on the left sides of the four partition plates 53 on the left, and the four sliding racks 82 on the right are respectively located on the left sides of the four partition plates 53 on the left. The movable frame 82 is respectively located on the right side of the four partition plates 53 on the right side. An elastic member is installed between the sliding frame 82 and the adjacent partition plate 53. The elastic member is set as a spring sheet. The sliding frame 82 is provided with evenly distributed cylindrical rods. The cylindrical rods of the sliding frame 82 cooperate with the adjacent partition membrane 81. Four elastic strips 83 with circumferential equidistant distribution are fixed between the two adjacent partition plates 53. The elastic strip 83 is fixed to the airbag 54. The elastic coefficient of the elastic strip 83 is greater than the elastic coefficient of the airbag 54. Through the limitation of the elastic strip 83, the airbag 54 shrinks and moves in the horizontal direction during the expansion process, and the elliptical ring 1 and the spiral rod 2 on the outer side of the auxiliary airbag 54 shrink accordingly, controlling the uniform deformation of the cylindrical bracket composed of the elliptical ring 1 and the spiral rod 2 to maintain the stability of the cylindrical bracket structure.

[0036] After gas is injected into the airway 51 through the inflation mechanism, the gas enters the airbag 54 and the two adjacent partition plates 53 through the circular holes on the airway 51 and the circular holes on the propulsion tube 5. In the initial state, under the shielding effect of the partition membrane 81, the gas will first fill the area of ​​the airbag 54 connected to the two middle partition plates 53. The airbag 54 in this area expands and squeezes the middle elliptical ring 1 and the spiral rod 2 to expand outward. Then the pressure between the two middle partition plates 53 increases. At this time, the rubber ring 8 on the partition plate 53 limits the position of the left and right symmetrical partition plates 53 in the middle to avoid being separated from each other.

[0037] During the expansion process of the airbag 54 between the two middle partition plates 53, the airbag 54 deforms and at the same time drives the elastic strip 83 to deform together. Since the elastic coefficient of the elastic strip 83 is greater than the elastic coefficient of the airbag 54, during the expansion process of the airbag 54 in the designated area, the airbag 54 pulls the two adjacent partition plates 53 closer together through the elastic strip 83, that is, the airbag 54 contracts in the horizontal direction, further assisting the deformation and expansion of the middle elliptical ring 1 and the spiral rod 2.

[0038] At the same time, as the gas pressure in the two middle partition plates 53 gradually increases, the gas pressure moves by squeezing the adjacent sliding frames 82, and the sliding frames 82 move to squeeze the adjacent elastic members. In the process of movement, the cylindrical rod on the sliding frame 82 pokes the adjacent partition membrane 81. After the cylindrical rod on the sliding frame 82 pokes the adjacent partition membrane 81, the gas moves into the chamber outside the two through the through holes on the adjacent partition plates 53. At this time, the pressure in the airbag 54 is instantly reduced, so that the middle part reduces the squeezing of the elliptical ring 1 and the spiral rod 2. At the same time, the middle part of the airbag 54 reduces the blockage of the coronary artery, thereby keeping the coronary artery unobstructed.

[0039] As the gas enters the area of ​​the four partition plates 53 in the middle of the airbag 54, the airbag 54 in the corresponding area of ​​the four partition plates 53 in the middle is inflated again, and the above operation is repeated, so that the middle part of all the elliptical rings 1 and the spiral rod 2 is intermittently expanded and squeezed to the left and right ends. At the same time, the corresponding partition plates 53 move accordingly to assist the elliptical rings 1 and the spiral rod 2 to expand evenly, thereby ensuring the stability of all the elliptical rings 1 and the spiral rod 2 after expansion.

[0040] It should be noted that the above preferred embodiments are merely illustrative of the technical concepts and features of the present invention. Their purpose is to enable those skilled in the art to understand the contents of the present invention and implement them accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications made in accordance with the spirit and essence of the present invention are intended to be encompassed within the scope of protection of the present invention.

Claims

1. A stable anti-displacement heart stent, characterized in that: The invention comprises a plurality of evenly distributed groups of elliptical rings (1), wherein the plurality of groups of elliptical rings (1) are all located on the same center line, and each group of elliptical rings (1) comprises three elliptical rings equidistantly distributed in the circumferential direction, and a spiral rod (2) is fixed between two adjacent elliptical rings (1) in the direction of the center line, and the spiral rod (2) and the elliptical ring (1) are staggered in the direction of the center line, and a first arc rod (21) is fixed between the adjacent elliptical rings (1) located at both ends of the center line, and all the elliptical rings (1), the spiral rod (2) and the first arc rod (21) cooperate to form a cylindrical bracket, and the cylindrical bracket is equipped with a conveying mechanism, and the conveying mechanism is used to squeeze the cylindrical bracket to expand.

2. A stable anti-displacement heart stent according to claim 1, characterized in that: Two adjacent groups of elliptical rings (1) are staggered, so that the outer side wall of the cylindrical support is wavy in the direction of the center line.

3. A stable anti-displacement heart stent according to claim 1, characterized in that: The facing sides of each group of elliptical rings (1) are provided with inclined surfaces (3), and the inclined surfaces (3) are used to reduce the obstruction of the corresponding elliptical rings (1) to blood. The opposite sides of each group of elliptical rings (1) are provided with evenly distributed grooves.

4. A stable anti-displacement heart stent according to claim 1, characterized in that: The spiral rod (2) is provided with a spindle-shaped hole (4) for adapting to the deformation of the spiral rod (2); both ends of the spindle-shaped hole (4) are circular for improving the strength of the spiral rod (2).

5. The stable anti-displacement heart stent according to claim 1, characterized in that: The conveying mechanism includes a propulsion tube (5), the propulsion tube (5) is arranged in the middle of the cylindrical bracket, an air guide tube (51) is fixedly connected to the inside of the propulsion tube (5), a guide wire (52) is slidably arranged in the middle of the air guide tube (51), the outer side surface of the propulsion tube (5) is provided with evenly distributed partition plates (53), the partition plates (53) are provided with through holes distributed equidistantly in the circumferential direction, the outer side surface of the propulsion tube (5) is fixedly connected to an air bag (54), the The airbag (54) is sleeved on the outside of the partition plate (53), and the airbag (54) is adhered to the partition plate (53). The outside of the airbag (54) is in contact with the cylindrical bracket. The side wall of the propulsion tube (5) and the side wall of the air guide tube (51) are both provided with circular holes distributed equidistantly in the circumferential direction. The circular holes on the air guide tube (51) are connected to the adjacent circular holes on the propulsion tube (5). The circular hole of the propulsion tube (5) is located in the middle of the airbag (54).

6. A stable anti-displacement heart stent according to claim 5, characterized in that: The auxiliary deformation mechanism is also included for controlling each group of the elliptical rings (1) to expand accordingly. The auxiliary deformation mechanism is arranged on the cylindrical bracket. The auxiliary deformation mechanism includes multiple groups of evenly distributed second arc rods (6). Each group of the second arc rods (6) includes six circumferentially equidistantly distributed second arc rods. The multiple groups of the second arc rods (6) are respectively arranged on adjacent single groups of the elliptical rings (1). The second arc rods (6) are fixedly connected to the corresponding elliptical rings (1). Two adjacent groups of the second arc rods (6) are respectively arranged on two spaced-apart groups. On the elliptical rings (1), a limiting rod (61) is fixedly connected between the adjacent second arc rods (6) in the same group, and both ends of the limiting rods (61) in the center line direction are fixedly connected with connecting rods (62), and the connecting rods (62) are fixedly connected to the adjacent elliptical rings (1). The elliptical rings (1) are provided with multiple groups of limiting components evenly distributed, and the limiting components are located between the two groups of elliptical rings (1) connected to the second arc rods (6), and each group of limiting components is used to limit the elliptical rings (1) after expansion.

7. A stable anti-displacement heart stent according to claim 6, characterized in that: The cross section of the second arc-shaped rod (6) gradually decreases from both ends to the middle, and the limiting rod (61) and two adjacent second arc-shaped rods (6) cooperate to form a Z shape.

8. The stable anti-displacement heart stent according to claim 6, characterized in that: The thickness of the long axis end of the elliptical ring (1) is greater than the thickness of the short axis end thereof, so as to reduce its deformation in the direction of the center line.

9. The stable anti-displacement heart stent according to claim 6, characterized in that: The limiting assembly comprises three first fixing plates (7) equidistantly distributed in the circumferential direction, the three first fixing plates (7) being fixed to adjacent elliptical rings (1), the elliptical ring (1) close to the first fixing plate (7) in the centerline direction being fixed to a second fixing rod (71), the first fixing plate (7) being provided with an arc-shaped hook, and the second fixing rod (71) being provided with a groove cooperating with the arc-shaped hook on the adjacent first fixing plate (7).

10. The stable anti-displacement heart stent according to claim 5, characterized in that: The airbag (54) is further provided with a contraction mechanism for contracting in the direction of the center line. The contraction mechanism is provided on the air guide tube (51). The partition plate (53) is slidably connected to the propulsion tube (5). The contraction mechanism includes symmetrically distributed and equidistantly distributed rubber rings (8). The symmetrically distributed and equidistantly distributed rubber rings (8) are respectively fixed to adjacent partition plates (53). Part of the through holes of the partition plates (53) are fixed with partition membranes (81). A sliding frame (82) is slidingly provided in the remaining through holes of (53), an elastic member is installed between the sliding frame (82) and the adjacent partition plate (53), the sliding frame (82) is provided with a cylindrical rod that cooperates with the adjacent partition membrane (81), and elastic strips (83) distributed equidistantly in the circumferential direction are fixed between the adjacent partition plates (53), the elastic strips (83) are fixed to the airbag (54), and the elastic coefficient of the elastic strip (83) is greater than the elastic coefficient of the airbag (54).

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