CN107088113A - A kind of complicated brace rod intravascular stent - Google Patents

Abstract

The invention discloses a complex support tendon vessel support, the support is a hollow tube, including multiple sets of hollow rings; each set of hollow rings includes a first hollow ring monomer and a second hollow ring arranged symmetrically in a mirror Single body; the first hollow ring single body includes a plurality of first zigzag support ribs connected end to end and attached to the cylindrical surface of the inner wall of the hollow tube; the first zigzag support ribs include first support ribs connected in sequence, and the second The supporting ribs are the first supporting connecting ribs, the third supporting ribs and the fourth supporting ribs; the second hollow ring monomer includes a plurality of second zigzag supporting ribs connected end to end and fitted with the cylindrical surface where the inner wall of the hollow tube is located; the second The two zigzag supporting ribs include the fifth supporting rib, the sixth supporting rib, the third supporting connecting rib, the seventh supporting rib and the eighth supporting rib connected in sequence. The invention has good flexibility, which enables the stent to be smoothly transported to the affected area by being pressed and held on the balloon, and can ensure the ability of the stent to pass through complex blood vessels and reach the lesion position smoothly.

Description

A kind of complex support tendon vessel stent

technical field

The invention belongs to the field of medical devices, and in particular relates to a stent for blood vessels, especially a stent with complex support ribs, which has good flexibility, and can be pressed and held on a balloon to smoothly transport the stent to the affected area. At the same time, the affected area can Therefore, it exerts excellent support performance, ensures that the stent bears the pressure of the blood vessel wall and blood flow pressure during use, reduces rebound, and prolongs the service life of the stent.

Background technique

Cardiovascular disease is the third leading cause of human death and seriously threatens human life. Human blood vessels are composed of inner wall, outer wall, intima, and lumen. Due to abnormal blood lipid metabolism in the blood, cholesterol and other lipids accumulate on the inner wall of blood vessels, causing problems such as narrowing of blood vessel walls and atherosclerosis, which leads to ischemia in the organ and eventually leads to ischemic pathological changes in the organ and tissue. For example, coronary atherosclerosis can cause angina pectoris and myocardial infarction; cerebral atherosclerosis can cause brain atrophy; coronary artery stenosis can cause myocardial ischemia, and eventually evolve into myocardial infarction, heart failure and other diseases.

Vascular stent refers to a product with a tube network structure, which can be implanted into human blood vessels like a stent to stretch out narrow blood vessels and support them for a long time, maintaining a certain expansion radius. Before the operation, a metal stent in a tight state is nested outside the balloon catheter, and the stent is first preloaded on the balloon; after being sent to the lesion through the delivery system, the balloon is inflated to make the stent expand: the balloon After contraction and retraction, the plastically deformed metal stent stays in place and is embedded in the blood vessel to ensure smooth blood flow in the blood vessel and complete the stent implantation

The advantage of vascular stents is that it can avoid restenosis caused by vascular rebound after PTCA, and the postoperative restenosis rate is significantly reduced by 12% to 19%. Therefore, patients who have undergone PTCA surgery usually undergo another stent implantation. However, studies have shown that it is precisely because of the implantation of stents that local intimal hyperplasia often occurs in narrow blood vessels, and sometimes serious complications such as thrombosis may occur. However, with the development of stent intervention, medical research shows that the use of antiplatelet and anticoagulant drugs can significantly reduce the incidence of thrombosis; and the emergence of drug-coated stents and degradable metal stents can reduce the restenosis rate of stents To within 10%, so the application of stent surgery is becoming more and more widely. When designing existing stents, most stents do not take into account the possibility of the "Dog boning" phenomenon that will occur in the stent. This is a process of warping the two ends of the stent, which will cause scraping damage to the blood vessel tissue near the two ends of the stent, and bring hidden dangers to the implanted stent.

Contents of the invention

According to the above-mentioned technical problems, a complex support tendon vessel stent is provided. The technical means adopted in the present invention are as follows:

A stent with complex supporting tendons, characterized in that the stent is a hollow tube and includes multiple groups of hollow rings;

Each group of hollow rings includes a first hollow ring monomer and a second hollow ring monomer arranged symmetrically in a mirror;

The first hollow ring unit includes a plurality of first zigzag support ribs connected end to end and attached to the cylindrical surface where the inner wall of the hollow tube is located;

The first zigzag support ribs include sequentially connected first support ribs, second support ribs, first support connecting ribs, third support ribs and fourth support ribs;

The first support rib rises in a left spiral along the cylindrical surface where the inner wall of the hollow tube is located;

The second support rib rises rightward along the cylindrical surface where the inner wall of the hollow tube is located;

The third support rib descends rightward along the cylindrical surface where the inner wall of the hollow tube is located, and is parallel to the second support rib;

The first support connecting rib is in the shape of a semicircle, and its two ends are respectively connected with the second supporting rib and the third supporting rib;

The fourth support rib descends along the axis of the cylindrical surface where the inner wall of the hollow tube is located;

The starting end of the first support rib is connected to the end of the fourth support rib of the adjacent first zigzag support rib through a second support connecting rib, and the second supporting connecting rib is in the shape of a semicircle;

The second hollow ring unit includes a plurality of second zigzag support ribs connected end to end and attached to the cylindrical surface where the inner wall of the hollow tube is located;

The second zigzag support ribs include sequentially connected fifth support ribs, sixth support ribs, third support connecting ribs, seventh support ribs and eighth support ribs;

The fifth support rib descends in a right spiral along the cylindrical surface where the inner wall of the hollow tube is located;

The sixth support rib descends in a left spiral along the cylindrical surface where the inner wall of the hollow tube is located;

The seventh support rib rises leftward along the cylindrical surface where the inner wall of the hollow tube is located, and is parallel to the sixth support rib;

The third supporting rib is in the shape of a semicircle, and its two ends are respectively connected to the sixth supporting rib and the seventh supporting rib;

The eighth support rib rises along the axis of the cylindrical surface where the inner wall of the hollow tube is located;

The starting end of the fifth supporting rib is connected to the terminal of the eighth supporting rib of the second zigzag supporting rib adjacent to it through the fourth supporting connecting rib, and the fourth supporting connecting rib is in the shape of a semicircle;

The first hollow ring monomer and the second hollow ring monomer of each group of hollow rings are connected by a plurality of first connecting ribs, and the two ends of the first connecting ribs are connected with the fourth supporting ribs respectively. The midpoint is connected to the midpoint of the eighth support rib corresponding to the fourth support rib, and the first connecting rib is attached to the cylindrical surface where the inner wall of the hollow tube is located;

Two adjacent groups of hollow rings are connected by a plurality of second connecting ribs, and the second connecting ribs are attached to the cylindrical surface where the inner wall of the hollow tube is located;

Both ends of the second connecting ribs are respectively connected with the third supporting connecting ribs and the first supporting connecting ribs of the first zigzag supporting ribs of another set of hollow rings corresponding to the third supporting connecting ribs.

The complex support tendon vascular stent includes five groups of hollow rings;

The first hollow ring unit includes seven first zigzag support ribs connected end to end and attached to the cylindrical surface where the inner wall of the hollow tube is located;

The second hollow ring unit includes seven second zigzag support ribs connected end to end and attached to the cylindrical surface where the inner wall of the hollow tube is located;

The first hollow ring monomer and the second hollow ring monomer of each group of hollow rings are connected by two first connecting ribs;

Two adjacent groups of hollow rings are connected by two second connecting ribs.

The first first connecting rib in the i-th group of hollow rings is located at the i-th first zigzag support rib of the first hollow-out ring monomer of the i-th group of hollow rings and the second of the i-th group of hollow rings. Between the i-th second zigzag support ribs of the hollow ring monomer, the second first connecting rib in the i-th group of hollow rings is located at the first hollow ring monomer of the i-th group of hollow rings. Between the i+4 first zigzag support ribs and the i+4th second zigzag support ribs of the second hollow ring monomer of the i group of hollow rings, wherein i is 1, 2 or 3;

The first first connecting rib in the jth group of hollow rings is located in the j-3 first zigzag support rib of the first hollow ring monomer of the j group of hollow rings and the jth group of hollow rings Between the j-3 second zigzag support ribs of the second hollow ring monomer, the second first connecting rib in the j group of hollow rings is located in the first hollow ring of the j group of hollow rings Between the jth first zigzag-shaped support rib of the monomer and the j-th second zigzag-shaped support rib of the second hollowed-out ring monomer of the j-th group of hollow rings, wherein j is 4 or 5;

The first second connection rib between the first group of hollow rings and the second group of hollow rings is located between the second second zigzag support rib and the second second hollow ring monomer of the first group of hollow rings. Between the second first zigzag support ribs of the first hollow ring monomer of the two groups of hollow rings; the second second connecting rib between the first group of hollow rings and the second group of hollow rings is located Between the sixth second zigzag support rib of the second hollow ring monomer of the first group of hollow rings and the sixth first zigzag support rib of the first hollow ring monomer of the second group of hollow rings between;

The first second connecting rib between the second group of hollow rings and the third group of hollow rings is located at the third second zigzag support rib of the second hollow ring monomer of the second group of hollow rings and the second Between the third first zigzag support ribs of the first hollow ring monomer of the three groups of hollow rings; the second second connecting rib between the second group of hollow rings and the third group of hollow rings is located Between the seventh second zigzag support rib of the second hollow ring monomer of the second group of hollow rings and the seventh first zigzag support rib of the first hollow ring monomer of the third group of hollow rings between;

The first second connecting rib between the third group of hollow rings and the fourth group of hollow rings is located at the first second zigzag support rib of the second hollow ring monomer of the third group of hollow rings. Between the first first zigzag support ribs of the first hollow ring monomer of the four groups of hollow rings; the second second connecting rib between the third group of hollow rings and the fourth group of hollow rings is located Between the fourth second zigzag support rib of the second hollow ring monomer of the third group of hollow rings and the fourth first zigzag support rib of the first hollow ring monomer of the fourth group of hollow rings between;

The first second connecting rib between the fourth group of hollow rings and the fifth group of hollow rings is located at the second second zigzag support rib of the second hollow ring monomer of the fourth group of hollow rings and the second Between the second first zigzag support ribs of the first hollow ring monomer of the five groups of hollow rings; the second second connecting rib between the fourth group of hollow rings and the fifth group of hollow rings is located Between the fifth second zigzag support rib of the second hollow ring monomer of the fourth group of hollow rings and the fifth first zigzag support rib of the first hollow ring monomer of the fifth group of hollow rings between.

The first connecting ribs include the first ribs, the second ribs, the third ribs, the fourth ribs, the fifth ribs, the sixth ribs and the seventh tendon;

The first rib extends circumferentially along the cylindrical surface where the inner wall of the hollow tube is located and points to the corresponding first support rib;

The second rib descends along the axis of the cylindrical surface where the inner wall of the hollow tube is located;

The third rib extends circumferentially along the cylindrical surface where the inner wall of the hollow tube is located and points to the corresponding first support rib;

The fourth rib descends along the axis of the cylindrical surface where the inner wall of the hollow tube is located;

The fifth support rib extends circumferentially along the cylindrical surface where the inner wall of the hollow tube is located and points to the corresponding eighth support rib;

The sixth rib descends along the axis of the cylindrical surface where the inner wall of the hollow tube is located;

The seventh support rib extends circumferentially along the cylindrical surface where the inner wall of the hollow tube is located and points to the corresponding eighth support rib;

The second connecting rib is a linear connecting rib extending along the axis of the cylindrical surface where the inner wall of the hollow tube is located.

The stent itself is a balloon-expandable stent, and its implantation method is the same as that of the traditional stent. The balloon is pressed and held, and the balloon is delivered to the affected area, and the expansion of the balloon drives the expansion of the stent and the expansion of the balloon. The capsule is withdrawn, and the stent remains in the affected area to function.

The invention has good flexibility, which enables the stent to be smoothly transported to the affected area by being pressed and held on the balloon, and can ensure the ability of the stent to pass through complex blood vessels and reach the lesion position smoothly. Because blood vessels are complex and curved, usually the stent can reach the lesion only after passing through the complex blood vessels smoothly. After the stent is implanted, the stent must maintain the same curved shape as the blood vessel after expansion and expansion, and cannot destroy the original shape of the blood vessel.

The present invention has the following advantages:

1. It has good expansion and expansion ability, which ensures the ability of the stent to be evenly stressed during the expansion process;

2. Possess good radial support force: after the expansion and expansion of the complex support tendon vascular stent is completed and the balloon is removed, it can maintain sufficient strength in the radial direction to resist the rebound caused by the rebound force from the vessel wall. It can therefore exert excellent support performance, ensure that the complex support tendon vascular stent can bear the pressure of the blood vessel wall and blood flow pressure during use, reduce rebound, and prolong the service life of the stent;

3. Possess the ability to accurately control the axial shortening time.

4. The first connecting ribs and the second connecting ribs are arranged in a spiral manner, so that the present invention can effectively reduce the possibility of relative rotation of the stent in the axial direction and reduce damage to the inner wall of the blood vessel.

5. The second connecting rib is a linear connecting rib. On the one hand, it avoids the accumulation of shortening of the supporting ribs of various shapes on the whole bracket in the axial direction. On the other hand, it makes the supporting ribs of each shape expand naturally to both sides, increasing the compliance of the bracket At the same time, it also makes up for the axial shortening of the supporting ribs of each shape. The width of the straight connecting ribs is larger than that of the first connecting ribs. The purpose is to better avoid the "Dog boning" phenomenon; the first connecting ribs are bottomless " "convex" shape, the approximate circular arc design can effectively avoid stress concentration, the connection points of the two kinds of connecting ribs are all at the midpoint of the supporting ribs connected with them, on the one hand, it can reduce the accumulation of shortening of the bracket in the axial direction , on the other hand, it can make the supporting ribs of each shape expand evenly to both sides;

Based on the above reasons, the present invention can be widely promoted in the fields of medical equipment and the like.

Description of drawings

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 that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained according to these drawings without any creative effort.

Fig. 1 is a schematic diagram of the structure of a complex strut vascular stent in a specific embodiment of the present invention.

Fig. 2 is an unfolded flat view of the complex strut tendon vessel stent in the specific embodiment of the present invention.

Fig. 3 is an enlarged schematic diagram of part I in Fig. 2 .

Fig. 4 is a schematic diagram of partial mesh division when the vascular stent with complex support tendons is crimped on the balloon in the specific embodiment of the present invention.

Fig. 5 is the simulation result of the expansion stage of the stent with complex supporting tendons in the specific embodiment of the present invention.

Fig. 6 is the simulation result of the expansion and unloading stage of the stent with complex support tendons in the specific embodiment of the present invention.

detailed description

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

As shown in Fig. 1-Fig. 6, a kind of stent with complex supporting ribs, the stent is a hollow tube, including five sets of hollow rings: the first set of hollow rings 1, the second set of hollow rings 2, the third set of hollow rings Hollow ring 3, the fourth group of hollow ring 4 and the fifth group of hollow ring 5;

Each group of hollow rings includes a first hollow ring monomer 11 and a second hollow ring monomer 12 arranged mirror-symmetrically;

The first hollow ring unit 11 includes seven first zigzag support ribs 111 connected end to end and attached to the cylindrical surface where the inner wall of the hollow tube is located;

The first zigzag support ribs 111 include sequentially connected first support ribs 1111, second support ribs 1112, first support connecting ribs 1115, third support ribs 1113 and fourth support ribs 1114;

The first support rib 1111 spirals upward along the cylindrical surface where the inner wall of the hollow tube is located;

The second support rib 1112 spirals upward along the cylindrical surface where the inner wall of the hollow tube is located;

The third support rib 1113 spirals downward along the cylindrical surface where the inner wall of the hollow tube is located, and is parallel to the second support rib 1112;

The first support connecting rib 1115 is in the shape of a semicircle, and its two ends are respectively connected with the second supporting rib 1112 and the third supporting rib 1113;

The fourth support rib 1114 descends along the axis of the cylindrical surface where the inner wall of the hollow tube is located;

The starting end 11111 of the first support rib 1111 is connected to the end 11141 of the fourth support rib 1114 of the adjacent first zigzag support rib 111 through the second support connecting rib 1116, and the second supporting connecting rib 1116 semi-circular;

The second hollow ring unit 12 includes seven second zigzag support ribs 121 connected end to end and attached to the cylindrical surface where the inner wall of the hollow tube is located;

The second zigzag supporting rib 121 includes a fifth supporting rib 1211, a sixth supporting rib 1212, a third supporting connecting rib 1215, a seventh supporting rib 1213 and an eighth supporting rib 1214 connected in sequence;

The fifth support rib 1211 spirals downward along the cylindrical surface where the inner wall of the hollow tube is located;

The sixth support rib 1212 descends in a left spiral along the cylindrical surface where the inner wall of the hollow tube is located;

The seventh support rib 1213 spirals upward along the cylindrical surface where the inner wall of the hollow tube is located, and is parallel to the sixth support rib 1212;

The third supporting rib 1215 is in the shape of a semicircle, and its two ends are respectively connected with the sixth supporting rib 1212 and the seventh supporting rib 1213;

The eighth support rib 1214 rises along the axis of the cylindrical surface where the inner wall of the hollow tube is located;

The starting end 12111 of the fifth supporting rib 1211 is connected to the terminal end 12141 of the eighth supporting rib 1214 of the second zigzag supporting rib 121 adjacent to it through the fourth supporting connecting rib 1216, and the fourth supporting connecting rib 1216 semi-circular;

The first hollow ring monomer 11 and the second hollow ring monomer 12 of each group of hollow rings are connected by two first connecting ribs 13, and the two ends of the first connecting rib 13 are respectively connected to the second The midpoints of the four supporting ribs 1114 are connected to the midpoints of the eighth supporting ribs 1214 corresponding to the fourth supporting ribs 1114, and the first connecting ribs 13 are attached to the cylindrical surface where the inner wall of the hollow tube is located;

Two adjacent groups of hollow rings are connected by two second connecting ribs 14, and the second connecting ribs 14 are attached to the cylindrical surface where the inner wall of the hollow tube is located;

Both ends of the second connecting rib 14 are respectively connected to the third supporting connecting rib 1215 and the first support of the first zigzag supporting rib 11 of another group of hollow rings corresponding to the third supporting connecting rib 1215. The connecting rib 1115 is connected;

The first first connecting rib 13 in the i-th group of hollow rings is located at the i-th first zigzag support rib 111 of the first hollow ring monomer 11 of the i-th group of hollow rings and the i-th group of hollow rings Between the i-th second zigzag support ribs 121 of the second hollow ring monomer 12, the second first connecting rib 13 in the i-th group of hollow rings is located in the first hollow of the i-th group of hollow rings Between the i+4th first zigzag support rib 111 of the ring monomer 11 and the i+4th second zigzag support rib 121 of the second hollow ring monomer 12 of the i group of hollow rings, Wherein, i is 1, 2 or 3;

The first first connecting rib 13 in the jth group of hollow rings is located in the j-3 first zigzag support ribs 111 of the first hollow ring monomer 11 of the j group of hollow rings and the jth group of hollowed out rings. Between the j-3 second zigzag support ribs 121 of the second hollow ring monomer 12 of the ring, the second first connecting rib 13 in the j group of hollow rings is located in the j group of hollow rings Between the jth first zigzag support rib 121 of the first hollow ring monomer 11 and the j second zigzag support rib 121 of the second hollow ring monomer 12 of the j group of hollow rings, Wherein, j is 4 or 5;

The first second connecting rib 14 between the first group of hollow rings 1 and the second group of hollow rings 2 is located at the second second sawtooth of the second hollow ring monomer 12 of the first group of hollow rings 1 between the second first zigzag support rib 111 of the first hollow ring monomer 11 of the second group of hollow rings 2; the first group of hollow rings 1 and the second group of hollow rings 2 The second second connecting rib 14 between the sixth second zigzag support rib 121 of the second hollow ring monomer 12 of the first group of hollow rings 1 and the first of the second group of hollow rings 2 Between the sixth first zigzag support ribs 111 of the hollow ring monomer 11;

The first second connecting rib 14 between the second group of hollow rings 2 and the third group of hollow rings 3 is located at the third second sawtooth of the second hollow ring monomer 12 of the second group of hollow rings 2 between the third first zigzag support rib 111 of the first hollow ring monomer 11 of the third group of hollow rings 3; the second group of hollow rings 2 and the third group of hollow rings 3 The second second connecting rib 14 between the seventh second zigzag support rib 121 of the second hollow ring monomer 12 of the second group of hollow rings 2 and the first of the third group of hollow rings 3 Between the seventh and first zigzag support ribs 111 of the hollow ring monomer 11;

The first second connecting rib 14 between the third group of hollow rings 3 and the fourth group of hollow rings 4 is located at the first second serration of the second hollow ring monomer 12 of the third group of hollow rings 3 between the first zigzag support ribs 111 of the first hollow ring monomer 11 of the fourth group of hollow rings 4; the third group of hollow rings 3 and the fourth group of hollow rings 4 The second second connecting rib 14 between the fourth and second zigzag support ribs 121 of the second hollow ring monomer 12 of the third group of hollow rings 3 and the first of the fourth group of hollow rings 4 Between the fourth and first zigzag support ribs 111 of the hollow ring monomer 11;

The first second connecting rib 14 between the fourth group of hollow rings 4 and the fifth group of hollow rings 5 is located at the second second sawtooth of the second hollow ring monomer 12 of the fourth group of hollow rings 4 Between the second first zigzag support rib 121 and the second first zigzag support rib 111 of the first hollow ring monomer 11 of the fifth group of hollow ring 5; the fourth group of hollow ring 4 and the fifth group of hollow ring 5 The second second connecting rib 14 between the fifth second zigzag support rib 121 of the second hollow ring monomer 12 of the fourth group of hollow rings 4 and the first of the fifth group of hollow rings 5 Between the fifth and first saw-tooth-shaped support ribs 111 of the hollow ring monomer 11 .

The first connecting rib 13 includes a first rib 131, a second rib 132, a third rib 133, a fourth rib 134, and a fifth rib that are sequentially connected by a quarter-arc rib 138. 135, the sixth tendon 136 and the seventh tendon 137;

The first rib 131 extends circumferentially along the cylindrical surface where the inner wall of the hollow tube is located and points to the corresponding first support rib 1111;

The second rib 132 descends along the axis of the cylindrical surface where the inner wall of the hollow tube is located;

The third support rib 133 extends circumferentially along the cylindrical surface where the inner wall of the hollow tube is located and points to the corresponding first support rib 1111;

The fourth rib 134 descends along the axis of the cylindrical surface where the inner wall of the hollow tube is located;

The fifth rib 135 extends circumferentially along the cylindrical surface where the inner wall of the hollow tube is located and points to the corresponding eighth rib 1214;

The sixth rib 136 descends along the axis of the cylindrical surface where the inner wall of the hollow tube is located;

The seventh rib 137 extends circumferentially along the cylindrical surface where the inner wall of the hollow tube is located and points to the corresponding eighth rib 1214;

The second connecting rib 14 is a linear connecting rib extending along the axis of the cylindrical surface where the inner wall of the hollow tube is located.

The length of the hollow tube is 12mm, the wall thickness is 0.09mm, and the outer diameter is 1.53mm;

The first supporting rib 1111, the second supporting rib 1112, the first supporting rib 1115, the third supporting rib 1113, the fourth supporting rib 1114, the second supporting rib 1116, the fifth supporting rib 1211, the sixth supporting rib 1212, The widths of the third supporting rib 1215, the seventh supporting rib 1213, the eighth supporting rib 1214, and the fourth supporting rib 1216 are all 0.1mm;

The width of the first connecting rib 13 is 0.08mm;

The width of the second connecting rib 14 is 0.1 mm;

As shown in Figure 1, extending to the left means rising, and extending to the right means falling;

As shown in Figure 2, the "first" of each component refers to which one is located at the top;

In order to simplify the calculation process, a single unit is selected as the bracket analysis model, and half of the structure of the first connecting rib 13 and half of the structure of the second connecting rib 14 are selected. The hollow tube adopts two complete first zigzag support ribs 111 structures. The balloon model is established by the cylindrical surface where the inner wall of the hollow tube is located. Also in order to optimize the model, select a part of the balloon that can completely support the analysis model of the bracket. The balloon material is a virtual hyperelastic material, constraining all degrees of freedom of the balloon, and defining the balloon For thin noodles. Contact is established between the balloon model and the bracket analysis model and friction effects are ignored.

This simulation process does not consider the crimping process, but only considers the deformation, stress and strain during the expansion process of the stent. Since the boundary conditions and solution settings are the same as the displacement load, but because it is a contact problem, it is necessary to define the frictionless contact between the inner surface of the bracket analysis model and the outer surface of the balloon model, and the contact performance is asymmetrical, allowing the deformation process of the balloon model Medium penetration bracket analysis model, but the threshold is a very small amount, and here there is a change in the link of pressure load addition.

Divide the load step into two stages, namely:

Load step 1 is the stage where the stent analysis model expands freely and is subjected to expansion force. At this stage, the balloon is inflated, and the inflation force is applied to the balloon, and the pressure load is 1.2Mpa. At this time, the expansion of the balloon drives the expansion of the stent on the surface to the inner wall of the blood vessel. At the same time, the inner wall of the blood vessel will exert a pressure of 0.0133Mpa to prevent the expansion of the stent. In the expansion stage, the stent undergoes a stage of expanding to its original size, but it is still an elastic deformation stage at this time, so the load application is uniform.

Load step 2 is the unloading stage of stent expansion. At this time, no pressure load is set, and the inner wall of the blood vessel will still exert a pressure of 0.0133Mpa to prevent the expansion of the stent. At this time, the balloon will shrink back to its original size, and the stent will rebound slightly at this time.

Figure 5 is the cloud map of the expansion stage, and Figure 6 is the cloud map of the expansion and unloading stage.

Expansion stage

The expansion phase includes a loading step, which is the free expansion of the balloon, and the expansion phase of the stent on the surface driven by the expansion force of the balloon. During this stage the balloon is inflated, applying an inflation force to the balloon, and the stent expands to the inner wall of the vessel.

expansion unloading phase

The expansion and unloading stage of the stent includes a load step. At this time, no pressure load is set on the balloon, and the balloon gradually returns to its original size. Under the action of the inner wall of the vessel and the properties of the material itself, the stent will rebound slightly at this time.

The biomechanical properties of the obtained scaffolds are shown in the table below,

Axial shortening rate χ ₁ (%) Radial return χ ₂ (%) Expansion inhomogeneity χ ₃ (%) Specified parameters ≤2 ≤2 ≤5 bracket 0.896 1.818 2.582

From Figure 5 and Figure 6, we can know the total deformation, equivalent total strain, and equivalent strain values of the bracket. The fatigue strength of the bracket is shown in the following table:

state Total deformation (mm) Equivalent total strain (mm/mm) Equivalent strain (mm/mm) before uninstall 0.967 0.1094 0.1094 after uninstall 0.935 0.10732 0.10732

The axial shortening rate, radial recovery, and expansion inhomogeneity of the stent are all within the specified parameters, indicating that the support performance and compliance performance of the stent can be guaranteed.

The total deformation of the bracket is within an acceptable range. From Figure 5 and Figure 6, it can be observed that the bracket is partially concentrated at the right-angle structure. However, all aspects of the parameters of the bracket are in line with the standard.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the various embodiments of the present invention. scope.

Claims (4)

1. a kind of complicated brace rod intravascular stent, it is characterised in that the support is hollow out pipe, including multigroup hollow out annulus；

Every group of hollow out annulus includes being in the symmetrically arranged first hollow out annulus monomer of minute surface and the second hollow out annulus monomer；

The first hollow out annulus monomer includes multiple join end to end and with the of cylindrical surface adhesive where the hollow out inside pipe wall One zigzag brace rod；

The first zigzag brace rod includes the first brace rod for being sequentially connected, the second brace rod, the first support dowel, the Three brace rods and the 4th brace rod；

First brace rod rises along face of cylinder left-hand screw where the hollow out inside pipe wall；

Second brace rod rises along face of cylinder right-hand screw where the hollow out inside pipe wall；

3rd brace rod declines along face of cylinder right-hand screw where the hollow out inside pipe wall, and flat with second brace rod OK；

The first support dowel is in semicircular arc, and its two ends connects with second brace rod and the 3rd brace rod respectively Connect；

4th brace rod declines along face of cylinder axis where the hollow out inside pipe wall；

The terminal at the top of first brace rod and the 4th brace rod of the first zigzag brace rod adjacent thereto is led to The second support dowel is crossed, the second support dowel is in semicircular arc；

The second hollow out annulus monomer includes multiple join end to end and with the of cylindrical surface adhesive where the hollow out inside pipe wall Two zigzag brace rods；

The second zigzag brace rod includes the 5th brace rod that is sequentially connected, the 6th brace rod, the 3rd support dowel, the Seven brace rods and the 8th brace rod；

5th brace rod declines along face of cylinder right-hand screw where the hollow out inside pipe wall；

6th brace rod declines along face of cylinder left-hand screw where the hollow out inside pipe wall；

7th brace rod rises along face of cylinder left-hand screw where the hollow out inside pipe wall, and flat with the 6th brace rod OK；

The 3rd support dowel is in semicircular arc, and its two ends connects with the 6th brace rod and the 7th brace rod respectively Connect；

8th brace rod rises along face of cylinder axis where the hollow out inside pipe wall；

The terminal at the top of the 5th brace rod and the 8th brace rod of the second zigzag brace rod adjacent thereto is led to The 4th support dowel connection is crossed, the 4th support dowel is in semicircular arc；

Connected between the first hollow out annulus monomer and the second hollow out annulus monomer of every group of hollow out annulus by multiple first dowels Connect, the two ends of first dowel respectively with the midpoint of the 4th brace rod and with corresponding to the 4th brace rod The midpoint connection of eight brace rods, first dowel and cylindrical surface adhesive where the hollow out inside pipe wall；

Connected between two adjacent groups hollow out annulus by multiple second dowels, second dowel and the hollow out inside pipe wall Place cylindrical surface adhesive；

The two ends of second dowel are supported corresponding to dowel with the described 3rd support dowel and the described 3rd respectively First support dowel connection of the first zigzag brace rod of another set hollow out annulus.

2. complicated brace rod intravascular stent according to claim 1, it is characterised in that：The complicated brace rod intravascular stent Including five groups of hollow out annulus；

The first hollow out annulus monomer includes seven and joined end to end and with the of cylindrical surface adhesive where the hollow out inside pipe wall One zigzag brace rod；

The second hollow out annulus monomer includes seven and joined end to end and with the of cylindrical surface adhesive where the hollow out inside pipe wall Two zigzag brace rods；

Connected between the first hollow out annulus monomer and the second hollow out annulus monomer of every group of hollow out annulus by two the first dowels Connect；

Connected between two adjacent groups hollow out annulus by two the second dowels.

3. complicated brace rod intravascular stent according to claim 2, it is characterised in that：

First the first dowel in i-th group of hollow out annulus is located at the i-th of the first hollow out annulus monomer of i-th group of hollow out annulus I-th of second zigzag brace rods of the second hollow out annulus monomer of individual first zigzag brace rod and i-th group of hollow out annulus it Between, second the first dowel in i-th group of hollow out annulus be located at the first hollow out annulus monomer of i-th group of hollow out annulus i-th+ The i-th+4 the second zigzag brace rods of the second hollow out annulus monomer of 4 the first zigzag brace rods and i-th group of hollow out annulus Between, wherein, i is 1,2 or 3；

First the first dowel in jth group hollow out annulus is located at the of the first hollow out annulus monomer of jth group hollow out annulus The zigzag of jth -3 second of j-3 the first zigzag brace rods and the second hollow out annulus monomer of jth group hollow out annulus is supported Between muscle, second the first dowel in jth group hollow out annulus is located at the first hollow out annulus monomer of jth group hollow out annulus J-th of second zigzag brace rods of j-th of first zigzag brace rods and the second hollow out annulus monomer of jth group hollow out annulus Between, wherein, j is 4 or 5；

First the second dowel between first group of hollow out annulus and second group of hollow out annulus is located at first group of hollow out annulus First hollow out annulus monomer of second the second zigzag brace rod of the second hollow out annulus monomer and second group of hollow out annulus Between second the first zigzag brace rod；Second second connection between first group of hollow out annulus and second group of hollow out annulus The 6th the second zigzag brace rod and second group of hollow out that muscle is located at the second hollow out annulus monomer of first group of hollow out annulus are justified Between 6th the first zigzag brace rod of the first hollow out annulus monomer of ring；

First the second dowel between second group of hollow out annulus and the 3rd group of hollow out annulus is located at second group of hollow out annulus First hollow out annulus monomer of the 3rd the second zigzag brace rod of the second hollow out annulus monomer and the 3rd group of hollow out annulus Between 3rd the first zigzag brace rod；Second second connection between second group of hollow out annulus and the 3rd group of hollow out annulus The 7th the second zigzag brace rod and the 3rd group of hollow out that muscle is located at the second hollow out annulus monomer of second group of hollow out annulus are justified Between 7th the first zigzag brace rod of the first hollow out annulus monomer of ring；

First the second dowel between 3rd group of hollow out annulus and the 4th group of hollow out annulus is located at the 3rd group of hollow out annulus First hollow out annulus monomer of first the second zigzag brace rod of the second hollow out annulus monomer and the 4th group of hollow out annulus Between first the first zigzag brace rod；Second second connection between 3rd group of hollow out annulus and the 4th group of hollow out annulus The 4th the second zigzag brace rod and the 4th group of hollow out that muscle is located at the second hollow out annulus monomer of the 3rd group of hollow out annulus are justified Between 4th the first zigzag brace rod of the first hollow out annulus monomer of ring；

First the second dowel between 4th group of hollow out annulus and the 5th group of hollow out annulus is located at the 4th group of hollow out annulus First hollow out annulus monomer of second the second zigzag brace rod of the second hollow out annulus monomer and the 5th group of hollow out annulus Between second the first zigzag brace rod；Second second connection between 4th group of hollow out annulus and the 5th group of hollow out annulus The 5th the second zigzag brace rod and the 5th group of hollow out that muscle is located at the second hollow out annulus monomer of the 4th group of hollow out annulus are justified Between 5th the first zigzag brace rod of the first hollow out annulus monomer of ring.

4. according to any described complicated brace rod intravascular stents of claim 1-3, it is characterised in that：The first dowel bag Include first muscle being sequentially connected by quadrant arc branch muscle, second muscle, the 3rd muscle, the 4th muscle, the 5th Muscle, the 6th muscle and the 7th muscle；

First muscle extends along cylindrical surface peripheral where the hollow out inside pipe wall and points to the first corresponding brace rod；

Second muscle declines along face of cylinder axis where the hollow out inside pipe wall；

3rd muscle extends along cylindrical surface peripheral where the hollow out inside pipe wall and points to the first corresponding brace rod；

4th muscle declines along face of cylinder axis where the hollow out inside pipe wall；

5th muscle extends along cylindrical surface peripheral where the hollow out inside pipe wall and points to the 8th corresponding brace rod；

6th muscle declines along face of cylinder axis where the hollow out inside pipe wall；

7th muscle extends along cylindrical surface peripheral where the hollow out inside pipe wall and points to the 8th corresponding brace rod；

Second dowel is the linear pattern dowel along face of cylinder axis extension where the hollow out inside pipe wall.