阅读说明：本技术 医用支架及支架系统 (Medical stent and stent system ) 是由 刘子昂 �田�浩 于 2020-04-29 设计创作，主要内容包括：本发明涉及一种医用支架及支架系统,所述医用支架包括连接杆和多个波圈,多个所述波圈沿所述医用支架的轴向依次布置,且多个所述波圈通过所述连接杆连接。所述医用支架被配置为：在所述医用支架扩张的过程中,所述波圈对所述连接杆施加作用力,以不减小所述连接杆在所述医用支架之轴向上的长度,进而不减小所述医用支架的轴向长度,以提高所述医用支架的定位准确性。(The invention relates to a medical stent and a stent system, wherein the medical stent comprises a connecting rod and a plurality of wave rings, the wave rings are sequentially arranged along the axial direction of the medical stent, and the wave rings are connected through the connecting rod. The medical stent is configured to: in the process of expanding the medical stent, the wave ring exerts an acting force on the connecting rod so as not to reduce the length of the connecting rod in the axial direction of the medical stent and further not to reduce the axial length of the medical stent so as to improve the positioning accuracy of the medical stent.)

1. A medical stent is characterized by comprising a connecting rod and a plurality of wave rings, wherein the wave rings are sequentially arranged along the axial direction of the medical stent and are connected through the connecting rod;

the medical stent is configured to: in the process of expanding the medical stent, the wave ring exerts acting force on the connecting rod so as not to reduce the length of the connecting rod in the axial direction of the medical stent and further not to reduce the axial length of the medical stent.

2. The medical stent of claim 1, wherein the wave form of the wave ring is a triangular wave and/or a sinusoidal wave.

3. The medical stent of claim 1 or 2, wherein the connecting rod comprises a plurality of sub-connecting rods, each sub-connecting rod connecting two adjacent wave rings; in the axial direction of the medical stent, the wave ring is provided with a first side edge and a second side edge which are opposite, and the first side edge and the second side edge of at least one wave ring are provided with the sub-connecting rods in a staggered manner;

the medical stent is configured to: in the expansion process of the medical stent, the wave ring drives the sub-connecting rods on the first side edge and the sub-connecting rods on the second side edge to move away from each other in a back-to-back mode so as to reduce the overlapping length between the sub-connecting rods and further increase the axial length of the connecting rods on the medical stent.

4. The medical stent of claim 3, wherein the length of the sub-connecting rods in the axial direction of the medical stent is 0.02mm to 5 mm.

5. The medical stent of claim 4, wherein the wave ring has a triangular wave shape, and the wave ring is formed by connecting a plurality of linear wave bars end to end in sequence; the sub-connecting rod is parallel to the axial linear structure of the medical support, and the length L of the sub-connecting rod is as follows:

wherein T is the length of one period of the wave ring, and alpha is the angle of an acute angle formed between the sub-connecting rod and the wave rod.

6. The medical stent of claim 5, wherein a ranges from 10 ° < a <90 °.

7. The medical stent of claim 6, wherein α is in a range of 30 ° to 45 °.

8. The medical stent of claim 4, wherein the wave ring has a sine wave shape, the sub-connecting rods have a linear structure parallel to the axial direction of the medical stent, and the length L of the sub-connecting rods is:

2a≤L<2.5a

wherein a is the amplitude of the wave ring.

9. The medical stent of claim 8, wherein a has a value in the range of 0.1mm < a <3.5 mm.

10. The medical stent of claim 9, wherein a has a value in the range of T ≦ a ≦ 1.5T, where T is the length of one period of the wave ring.

11. The medical stent of claim 1 or 2, wherein the connecting rods are in a non-linear structure, the number of the connecting rods is at least two, and each connecting rod is connected with at least two wave rings;

the medical stent is configured to: during expansion of the medical stent, the wave ring applies a force to the connecting rod to deform the connecting rod without reducing the length of the connecting rod in the axial direction of the medical stent.

12. The medical stent of claim 11, wherein the shape of the connecting rods is a triangular wave shape and/or a sinusoidal wave shape.

13. The medical stent of claim 12, wherein the shape of the connecting rods is a sine wave, a line connecting the 0 ° phase point and the 180 ° phase point of each connecting rod is parallel to the axis of the medical stent, and each connecting rod is connected with the 0 ° phase point or the 180 ° phase point of the wave ring.

14. The medical stent of claim 13, wherein two adjacent connecting rods are 180 ° out of phase, two adjacent wave rings are 180 ° out of phase, and the axial distance of two adjacent wave rings is 0.5t, where t is the length of one period of the connecting rods.

15. The medical stent of claim 13, wherein the phases of two adjacent wave circles are the same, and the distance between two adjacent wave circles is t; the phases of two adjacent connecting rods are the same, and the distance between the two adjacent connecting rods is T, wherein T is the length of one period of the connecting rods, and T is the length of one period of the wave ring.

16. The medical stent of claim 13, wherein the length of one period of the connecting bar is equal to the length of one period of the wave ring.

17. The medical stent of claim 1, wherein the length T of one period of the wave ring is 0.5mm to 3.5 mm.

18. The medical stent of claim 17, wherein the length T of one period of the wave ring is 0.1 pi D ≦ T ≦ 0.2 pi D, where D is the diameter of the medical stent.

19. The medical stent of claim 1, wherein the width W of the wave ring is 0.02mm ≦ W ≦ 0.1 mm; and/or the presence of a gas in the gas,

the width w of the connecting rod is more than or equal to 0.02mm and less than or equal to 0.1 mm; and/or the presence of a gas in the gas,

the diameter D of the medical bracket is more than or equal to 2.5mm and less than or equal to 5.0 mm.

20. The medical stent of claim 1, wherein the medical stent is a braided stent or a cut stent.

21. A stent system comprising a delivery mechanism and a medical stent according to any of claims 1-20, the medical stent being in a compressed state and disposed on the delivery mechanism.

Technical Field

The invention relates to the technical field of medical instruments, in particular to a medical stent and a stent system.

Background

Medical stents, such as vascular stents, prosthetic heart valve stents, and the like, are widely used in clinical medicine to access the inside of a human body lumen and support a lesion site of the human body lumen through a delivery device to achieve treatment. The medical stent is in a compressed state during delivery and is released to be in an expanded state when reaching a lesion site.

The existing medical stent is generally a tubular structure formed by repeatedly arranging a plurality of stent units, wherein the stent units of the cutting stent are in a multi-dimensional wavy structure, and the stent units of the weaving stent are mostly in a net structure. After being pressed and held, the medical stent is conveyed to a lesion position in a lumen by a pushing system and then expanded to a working size. When a traditional medical stent is expanded along the radial direction, the phenomenon of axial dimension shortening often occurs, and the axial shortening of the medical stent easily causes inaccurate positioning, so that the treatment effect is adversely affected.

Disclosure of Invention

The invention aims to provide a medical stent and a stent system, which aim to solve the problem of inaccurate positioning of the medical stent caused by axial shortening of the conventional medical stent during radial expansion.

In order to achieve the purpose, the medical stent provided by the invention comprises a connecting rod and a plurality of wave rings, wherein the wave rings are sequentially arranged along the axial direction of the medical stent and are connected through the connecting rod;

the medical stent is configured to: in the process of expanding the medical stent, the wave ring exerts acting force on the connecting rod so as not to reduce the length of the connecting rod in the axial direction of the medical stent and further not to reduce the axial length of the medical stent.

Optionally, the wave form of the wave ring is a triangular wave and/or a sine wave.

Optionally, the connecting rod comprises a plurality of sub-connecting rods, and each sub-connecting rod connects two adjacent wave rings; in the axial direction of the medical stent, the wave ring is provided with a first side edge and a second side edge which are opposite, and the first side edge and the second side edge of at least one wave ring are provided with the sub-connecting rods in a staggered manner;

the medical stent is configured to: in the expansion process of the medical stent, the wave ring drives the sub-connecting rods on the first side edge and the sub-connecting rods on the second side edge to move away from each other in a back-to-back mode so as to reduce the overlapping length between the sub-connecting rods and further increase the axial length of the connecting rods on the medical stent.

Optionally, the length of the sub-connecting rod in the axial direction of the medical stent is 0.02mm-5 mm.

Optionally, the wave form of the wave ring is triangular, and the wave ring is formed by sequentially connecting a plurality of linear wave rods end to end; the sub-connecting rod is parallel to the axial linear structure of the medical support, and the length L of the sub-connecting rod is as follows:

wherein T is the length of one period of the wave ring, and alpha is the angle of an acute angle formed between the sub-connecting rod and the wave rod.

Optionally, α is in the range of 10 ° < α <90 °.

Optionally, the value range of alpha is more than or equal to 30 degrees and less than or equal to 45 degrees.

Optionally, the waveform of the wave ring is a sine wave, the sub-connecting rods are linear structures parallel to the axial direction of the medical stent, and the length L of the sub-connecting rods is:

2a≤L<2.5a

wherein a is the amplitude of the wave ring.

Optionally, a is in a range of 0.1mm < a <3.5 mm.

Optionally, a is greater than or equal to T and less than or equal to 1.5T, where T is the length of one period of the wave ring.

Optionally, the shape of the connecting rods is a nonlinear structure, the number of the connecting rods is at least two, and each connecting rod is connected with at least two wave rings;

the medical stent is configured such that, during expansion of the medical stent, the wave ring applies a force to the connecting rod to deform the connecting rod without reducing the length of the connecting rod in the axial direction of the medical stent.

Optionally, the shape of the connecting rod is at least one of a triangular waveform or a sinusoidal waveform.

Optionally, the shape of the connecting rods is a sine wave shape, a connecting line of the 0 ° phase point and the 180 ° phase point of each connecting rod is parallel to the axis of the medical stent, and each connecting rod is connected with the 0 ° phase point or the 180 ° phase point of the wave ring.

Optionally, the phase difference between two adjacent connecting rods is 180 °, the phase difference between two adjacent wave rings is 180 °, and the axial distance between two adjacent wave rings is 0.5t, where t is the length of one cycle of the connecting rod.

Optionally, the phases of two adjacent wave coils are the same, and the distance between the two adjacent wave coils is t; the phases of two adjacent connecting rods are the same, and the distance between the two adjacent connecting rods is T, wherein T is the length of one period of the connecting rods, and T is the length of one period of the wave ring.

Optionally, the length of one period of the connecting rod is equal to the length of one period of the wave ring.

Optionally, the length T of one period of the wave ring is 0.5mm ≦ T ≦ 3.5 mm.

Optionally, the length T of one period of the wave ring is 0.1 pi D ≦ T ≦ 0.2 pi D, where D is the diameter of the medical stent.

Optionally, the width W of the wave ring is more than or equal to 0.02mm and less than or equal to 0.1 mm; and/or the presence of a gas in the gas,

the width w of the connecting rod is more than or equal to 0.02mm and less than or equal to 0.1 mm; and/or the presence of a gas in the gas,

the diameter D of the medical support is more than or equal to 2.5mm and less than or equal to 5.0 mm.

Optionally, the medical stent is a braided stent or a cut stent.

In addition, in order to achieve the above object, the present invention further provides a stent system, comprising a delivery mechanism and the medical stent as described in any one of the above, wherein the medical stent is in a compressed state and is disposed on the delivery mechanism.

Compared with the prior art, the medical stent and the stent have the following advantages:

the medical stent comprises a connecting rod and a plurality of wave rings, the wave rings are sequentially arranged along the axial direction of the medical stent, and the wave rings are connected through the connecting rod; in the process of expanding the medical stent, the wave ring expands radially and can apply acting force on the connecting rod so as not to reduce the length of the connecting rod in the axial direction of the medical stent, and further the axial length of the medical stent can not be reduced, thereby overcoming the shortages of the medical stent and improving the positioning accuracy of the medical stent.

Drawings

FIG. 1 is a schematic diagram of a medical stent according to an embodiment of the present invention;

FIG. 2 is a partially schematic plan expanded view of the medical stent of FIG. 1;

FIG. 3 is a partially schematic, planar deployment view of a medical stent according to a second embodiment of the present invention;

FIG. 4 is a partially schematic planar deployment view of a medical stent according to a third embodiment of the present invention;

FIG. 5 is a partially schematic, planar deployment view of a medical stent according to a fourth embodiment of the present invention;

[ reference numerals are described below ]:

100-medical stents;

110-wave ring, 110 a-first wave ring, 110 b-second wave ring, 110 b' -first side, 110b "-second side, 110 c-third wave ring, 111-wave bar;

120-a connecting rod;

121-sub-connecting rod, 121 a-first sub-connecting rod, 121 b-second sub-connecting rod.

Detailed Description

The core idea of the invention is to provide a medical stent, which comprises a connecting rod and a plurality of wave rings, wherein the wave rings are sequentially arranged along the axial direction of the medical stent, and the wave rings are connected through the connecting rod. The medical stent is configured in such a way that the wave ring exerts an acting force on the connecting rod during the expansion of the medical stent, so as not to reduce the length of the connecting rod in the axial direction of the medical stent and further not to reduce the axial length of the medical stent, thereby alleviating or even overcoming the problem of inaccurate positioning of the medical stent.

The medical stent includes, but is not limited to, a cut stent or a woven stent, and the material for manufacturing the medical stent may be a metal material such as nickel-titanium alloy, cobalt-chromium alloy, or stainless steel. According to the specific structure of the medical stent, during the expansion process of the medical stent, the connecting rod moves or deforms and the like to achieve the purpose of not reducing the total length of the connecting rod in the axial direction of the medical stent, so that the axial length of the medical stent is not reduced, and the shortening caused by the radial expansion of the wave ring is resisted or even eliminated.

To further clarify the objects, advantages and features of the present invention, a more particular description of the invention will be rendered by reference to the appended drawings. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.

As used in this specification, the singular forms "a", "an" and "the" include plural referents, and the plural forms "a plurality" include more than two referents, e.g., "two", "three", "four", or even more referents, unless the content clearly dictates otherwise. As used in this specification, the term "or" is generally employed in its sense including "and/or" unless the content clearly dictates otherwise, and the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either fixedly connected, detachably connected, or integrally connected. Either mechanically or electrically. May be directly connected or indirectly connected through an intermediate. Either as communication within the two elements or as an interactive relationship of the two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations. The same or similar reference numbers in the drawings identify the same or similar elements.

In the embodiment of the present invention, the waveform of the wave ring may be at least one of a triangular wave or a sinusoidal wave, and the shape of the connecting rod may be at least one of a linear shape, a sinusoidal wave or a triangular wave, which is specifically set according to actual needs. While the alternative construction of the medical stent will be described in detail below with reference to the accompanying drawings, it is to be understood that the following examples are illustrative of alternative constructions of the invention and are not to be construed as limiting the invention. It should also be understood that the dimensions described hereinafter all refer to the dimensions of the medical stent in the expanded state.

Example one

Fig. 1 and fig. 2 show a schematic structural diagram of a medical stent 100 according to an embodiment of the present invention. As shown in fig. 1 and 2, in the present embodiment, the medical stent 100 includes a wave ring 110 and a connecting rod 120, and the wave ring 110 has a triangular wave. Preferably, the phases of two adjacent wave rings 110 are different by 180 °, that is, when two adjacent wave rings 110 are a first wave ring 110a and a second wave ring 110b, respectively, a peak of the first wave ring 110a is disposed opposite to a trough of the second wave ring 110b, and a trough of the first wave ring 110a is disposed opposite to a peak of the second wave ring 110 b. The connecting rod 120 includes a plurality of sub-connecting rods 121, the sub-connecting rods 121 may be a linear structure parallel to the axis of the medical stent 100, and each sub-connecting rod 121 connects two adjacent wave rings 110.

Generally, each of the medical stents 100 includes at least three wave rings 110, wherein two wave rings 110 are disposed at the edge, the rest wave rings 110 are sequentially disposed between the two wave rings 110, and then the adjacent two wave rings 110 are connected by the sub-connecting rod 121. That is, in this embodiment, along the axial direction of the medical stent 100, the wave ring 110 has a first side and a second side, and the first side and the second side of at least one wave ring 110 are respectively connected with the other wave rings 110 through the sub-connecting rods 121. Taking the orientation shown in fig. 1 as an example, regarding the second wave ring 110b in the figure, in the axial direction of the medical stent 100, the second wave ring 110b has a first side 110b '(e.g., a left side) and a second side 110 b' (e.g., a right side) which are opposite, the first wave ring 110a is disposed on the left side of the second wave ring 110b, the third wave ring 110c is disposed on the right side of the second wave ring 110b, then the first side 110b 'is connected to the first wave ring 110a through the sub-connecting rods 121 disposed on the first side 110 b', and the second side 110b "is connected to the third wave ring 110c through the sub-connecting rods 121 disposed on the second side 110 b". For convenience of description, the sub-link bar disposed on the first side 110 b' is defined as a first sub-link 121a, and the sub-link bar disposed on the second side 110b ″ is defined as a second sub-link bar 121 b. The first sub-connection bars 121a and the second sub-connection bars 121b are arranged in a staggered manner. It can be understood that, on the same wave ring 110, the number of the first sub-connecting rods 121a and the number of the second sub-connecting rods 121b may be equal, that is, in the circumferential direction of the wave ring 110, one second sub-connecting rod 121b is disposed between any two adjacent first sub-connecting rods 121a, and one first sub-connecting rod 121a is disposed between any two adjacent second sub-connecting rods 121 b. Alternatively, on the same wave ring 110, the number of the first sub-connecting rods 121a and the number of the second sub-connecting rods 121b are not equal, for example, in the circumferential direction of the wave ring 110, there may be one, two or more second sub-connecting rods 121b between two adjacent first sub-connecting rods 121 a.

With the above arrangement, when the medical stent 100 in a compressed state is expanded to a working size, the wave ring 110 is radially expanded, and at this time, the second wave ring 110b pushes the first sub-connecting rod 121a and the second sub-connecting rod 121b to move away from each other in a back-to-back manner. That is, the first sub-connection rod 121a moves to the left side and the second sub-connection rod 121b moves to the right side, so that the overlapping length of the first sub-connection rod 121a and the second sub-connection rod 121b in the axial direction of the medical stent 100 is reduced, and thus the total length of the connection rods 120 in the axial direction of the medical stent 100 is not reduced, so as to maintain the axial length of the medical stent 100 and achieve the purpose of resisting or even overcoming the shortening of the medical stent 100.

In this embodiment, the sub-connecting rod 121 may be disposed at any position between the wave crest and the wave trough of the wave ring 110, or at the wave crest or the wave trough of the wave ring 110. It should be noted that, when one end of one of the sub-connecting rods 121 disposed between two adjacent wave rings 110, for example, the first wave ring 110a and the second wave ring 110b, is connected to the wave crest of the first wave ring 110a, and the other end is connected to the wave trough of the second wave ring 110b, the sub-connecting rod 121 should be disposed on the concave side of the corresponding wave ring 110, so that the included angle formed by the sub-connecting rod 121 and the corresponding side of the wave ring 110 is an acute angle. Taking the first sub-connecting rod 121a and the second sub-connecting rod 121b disposed on the second wave ring 110b as an example, an included angle formed between the first sub-connecting rod 121a and the first side edge 110 b' is an acute angle, and an included angle formed between the second sub-connecting rod 121b and the second side edge 110b ″ is also an acute angle. It should be understood that the included angle formed by the sub-connecting rod 121 and the corresponding side of the wave ring 110 herein refers to the included angle when the medical stent plane is unfolded.

Preferably, the connecting rods 120 are disposed at the peaks or the valleys of the wave rings 110, for example, one end of one connecting rod 120 is connected to the peak of the first wave ring 110a, and the other end is connected to the valley of the second wave ring 110 b. In other embodiments, the connecting rod 120 may be disposed between the wave crest and the wave trough of one of the wave rings 110.

According to actual needs, in this embodiment, the diameter D of the medical stent 100 (i.e., the diameter of the wave ring 110) has a value range of 2.5mm or more and 5.0mm or less. The value range of the length T of one period of the wave ring 110 can be 0.5mm or more and less than or equal to T and 3.5mm or less, and further, the value range of the length T of one period of the wave ring 110 can be 0.1 pi D or less and T and less than or equal to 0.2 pi D or less. The width W of the wave ring 110 can be more than or equal to 0.02mm and less than or equal to 0.1mm, and the value of W is preferably more than or equal to 0.04mm and less than or equal to 0.06 mm. The sub connection rod 121 may have a width equal to that of the wave ring 110. It is understood that the width of the wave ring 110 herein refers to the distance between the first side and the second side, and the width of the sub-connecting rod 121 refers to the dimension of the sub-connecting rod 121 in the circumferential direction of the medical stent 100. Further, the wave ring 110 is formed by connecting a plurality of linear wave rods 111 end to end in sequence, and in the planar expanded pattern of the medical stent 100, an acute angle is formed between the sub-connecting rod 121 and the wave rods 111, and the acute angle is an acute angleThe angle a of (b) may be between 10 ° and 90 °, and preferably the acute angle a is greater than or equal to 30 ° and less than or equal to 45 °. The length L of the sub-connecting rod 121 may be between 0.02mm and 5 mm. Optionally, the length L of the sub-connecting rod 121 may also be calculated by the following formula:

generally, the smaller the length T of one period of the wave ring 110 and the angle α of the acute angle formed by the sub-connecting rod 121 and the wave rod 111 are, the less the total axial length of the medical stent 100 after being deployed is easily reduced, if the machining process and the use performance are allowed. The specific parameters of the medical stent 100 in this embodiment can be designed as follows: the diameter D of the medical stent 100 is 2.5mm, the length T of one period of the wave ring 110 is 0.8mm, the angle α of the acute angle formed between the sub-connecting rod 121 and the wave rod 111 is 30 °, the length of the sub-connecting rod 121 is 1.5mm, and the widths of the sub-connecting rod 121 and the wave ring 110 are 0.05 mm.

The medical stent 100 provided in this embodiment may be a cutting stent. The wave crest and the wave trough of the wave ring 110 are processed into round corners, and the joint of the sub-connecting rod 121 and the wave rod 111 is also processed into round corners, so as to avoid forming a sharp included angle on the medical stent 100, thereby reducing the stress concentration of the medical stent 100. Preferably, the radius R at each round corner is not less than 0.02mm and not more than 0.1mm, and further, the radius R can be not less than 0.02mm and not more than 0.05 mm.

Example two

Fig. 3 shows a schematic partially expanded plan view of a medical stent 100 according to a second embodiment of the present invention. As shown in fig. 3, the second embodiment is different from the first embodiment in that the waveform of the wave ring 110 is designed to be a sine wave to reduce the stress concentration area of the wave ring 110, thereby reducing the plastic deformation of the medical stent 100 after crimping. The connecting rod 120 may be designed according to the first embodiment, that is, the connecting rod 120 includes a plurality of sub-connecting rods 121 parallel to the axis of the medical stent 100, and each sub-connecting rod 121 connects two adjacent wave rings 110.

In this embodiment, the amplitude of the wave ring 110 is a, a is greater than 0.1mm and less than 3.5mm, and it is further preferable that T is greater than or equal to a and less than or equal to 1.5T, where T is the length of one period of the wave ring 110. The length L of the sub-connecting rod 121 is 0.02mm-5mm, and the length L of the sub-connecting rod 121 can be designed according to the amplitude of the wave ring 110, for example, the value of L can be selected within the range of L being greater than or equal to 2a and less than 2.5 a. Other parameters can be designed according to the first embodiment, for example, in this embodiment, specific parameters of the medical stent 100 can be designed as follows: the diameter D of the medical stent 100 is 3mm, the length T of one period of the wave ring 110 is 1mm, the amplitude a of the wave ring is 1.5mm, the length of the sub-connecting rod 121 is 3mm, the width of the wave ring 110 and the sub-connecting rod 121 is 0.05mm, and the radius R of a fillet formed at the intersection of the sub-connecting rod 121 and the wave ring 110 is 0.05 mm.

EXAMPLE III

Fig. 4 shows a schematic partially expanded plan view of a medical stent 100 provided in the third embodiment. As shown in fig. 4, in this embodiment, the waveform of the wave ring 110 is a sine wave, the connecting rod 120 is a nonlinear structure, such as a triangular waveform structure, a positive-selection waveform structure or other nonlinear structures, and preferably, the connecting rod 120 is a sine waveform structure in this embodiment, which is convenient for processing and manufacturing on the one hand, and on the other hand, the sine waveform structure is a smooth curve, so that the medical stent 100 is smoother, and is beneficial to reducing stress concentration on the medical stent 100 and plastic deformation after crimping.

With continued reference to fig. 4, the phase of two adjacent wave rings 110 is 180 ° different, and the phase of two adjacent connecting rods 120 is also 180 °. The line connecting the 0 ° phase point and the 180 ° phase point of the connecting rod 120 is parallel to the axis of the medical stent 100. The connecting rod 120 connects at least two wave rings 110 at the same time, and when the medical stent 100 is a woven stent, each connecting rod 120 can connect all the wave rings 110 at the same time. Preferably, the connecting rod 120 is connected to a point of the wave ring 110 located between the wave crest and the wave trough, for example, the connecting rod 120 may be connected to a 0 ° phase point or a 180 ° phase point of the wave ring 110. When the medical stent 100 in a compressed state is expanded, the wave rings 110 expand in a radial direction, and at the same time, two adjacent wave rings 110 apply opposite acting forces to the connecting rod 120 located between the two wave rings 110, so that the connecting rod 120 is deformed in a direction tending to be straightened, thereby achieving the purpose of not reducing the length of the connecting rod 120 in the axial direction of the medical stent 100. In some embodiments, the length of the connecting rod 120 in the axial direction of the medical stent 100 is increased or unchanged when the medical stent 100 in a compressed state is expanded according to the shape of the wave ring 110 and/or the connecting position of the connecting rod 120 and the wave ring 110.

Further, in the present embodiment, the length of the connecting rod 120 located between two adjacent wave rings 110 may be half of the length of one period of the connecting rod 120 (i.e., the axial distance between two adjacent wave rings 110), and the length of one period of the connecting rod 120 may be equal to the length of one period of the wave rings 110.

Alternatively, the parameters of the medical stent 100 provided in this embodiment may be designed by referring to the parameters of the medical stent 100 provided in the first embodiment. In this embodiment, the specific parameters of the medical stent 100 can be designed as follows: the diameter D of the medical stent 100 is 4mm, the length T of one period of the wave ring 110 and the connecting rod 120 is 1.5mm, and the length of the connecting rod 120 between two adjacent wave rings 110 in the axial direction of the medical stent 100 is 0.75 mm. The width W of the wave ring 110 and the width W of the connecting rod 120 may both be 0.02mm, the amplitude a of the wave ring 110 may be 1.5mm, and the amplitude of the connecting rod 120 may be equal to the amplitude of the wave ring 110. The radius R of the fillet formed at the intersection of the connecting rod 120 and the wave ring 110 is 0.05 mm.

In addition, in this embodiment, the waveform of at least one of the wave ring 110 and the connecting rod 120 may be a triangular wave.

Example four

Fig. 5 shows a schematic partially expanded plan view of a medical stent 100 provided in the fourth embodiment. As shown in fig. 5, the present embodiment is different from the fourth embodiment in that the phases of two adjacent wave rings 110 are the same, the phases of two adjacent connecting rods 120 are also the same, the distance between two adjacent wave rings 110 is the length of one period of the connecting rods 120, and the distance between two adjacent connecting rods 120 is the length of one period of the wave rings 110. The medical stent 100 provided in this embodiment is characterized in that the number of the connecting rods 120 is small, and the mesh area formed between the connecting rods 120 and the wave rod 110 is large, which is beneficial to increasing the flexibility of the medical stent 100.

Similarly, the parameters of the medical stent 100 provided in the present embodiment can be designed by referring to the parameters of the medical stent 100 in the embodiment. The specific parameters of the medical stent 100 in this embodiment can be designed as follows: the diameter D of the medical stent 100 is 4mm, the length T of one period of the wave ring 110 and the length T of one period of the connecting rod 120 may be 1.5mm, the amplitude of the wave ring 110 and the amplitude of the connecting rod 120 may be 1.5mm, the width of the wave ring 110 and the width of the connecting rod 120 may be 0.05mm, and the radius R of a fillet formed at the intersection of the connecting rod 120 and the wave ring 110 may be 0.05 mm.

In the above embodiment, the wave ring 110 of the medical stent 100 has a single wave shape, and the connecting rod 120 has only a single configuration. In other embodiments, however, the same medical stent may have both triangular and sinusoidal wave turns. And part of the connecting rods in the same medical support can be triangular wave shapes, part of the connecting rods can be sine wave shapes, and part of the connecting rods can also comprise linear sub-connecting rods.

Based on the medical stent 100, the invention also provides a stent system, which further comprises a conveying mechanism. In the stent system, the medical stent 100 is in a compressed state and is disposed on the delivery mechanism. Depending on the material from which the medical stent 100 is made, for example, when the medical stent 100 is made of a material having high elasticity such as nitinol, the medical stent 100 has self-expandability, and thus the delivery mechanism may include a delivery wire. When the medical stent 100 is made of stainless steel, cobalt-chromium alloy or other material with low elasticity, the delivery mechanism includes a medical balloon.

Although the present invention is disclosed above, it is not limited thereto. Various modifications and alterations of this invention may be made by those skilled in the art without departing from the spirit and scope of this invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.