CN114533355A

CN114533355A - Medical support

Info

Publication number: CN114533355A
Application number: CN202011306112.1A
Authority: CN
Inventors: 张广建; 刘梦钦; 姬庆如; 杨波
Original assignee: Shanghai Hongmai Medical Technology Co ltd
Current assignee: Shanghai Hongmai Medical Technology Co ltd
Priority date: 2020-11-19
Filing date: 2020-11-19
Publication date: 2022-05-27
Also published as: WO2022105401A1

Abstract

The invention relates to a medical stent, which comprises a stent body, wherein the stent body comprises a plurality of wave rings and connecting rods, the wave rings are sequentially arranged along the axial direction of the medical stent, and the wave rings are connected through the connecting rods; the medical stent is configured to: when the medical support is at least partially in a compressed state and is subjected to axial pressure, two adjacent wave rings are mutually abutted or have a preset distance, so that the axial length of the medical support is not reduced, the problem of shortening of the medical support is further solved, and the treatment effect is improved.

Description

Medical support

Technical Field

The invention relates to the technical field of medical instruments, in particular to a medical bracket.

Background

Cardiovascular disease has become the first killer to cause death in humans. In recent years, vascular prostheses such as stents have been widely used for the treatment of various vascular access abnormalities of the human body, such as angiomas, dissections, embolisms, stenoses, and other cardiovascular diseases.

Currently, ePTFE (expanded polytetrafluoroethylene) coated stents have been widely used in the field of implantable medical devices due to their excellent biocompatibility and superior lubricity. Indications for ePTFE-coated stents include peripheral vascular embolization, aortic and bifurcation dissection, aortic and bifurcation true aneurysms, aortic and bifurcation pseudoaneurysms, aortic and bifurcation penetrating ulcers, and the like. The use of stenting to treat cardiovascular disease greatly reduces operative mortality and postoperative complications, reduces surgical trauma and facilitates postoperative recovery of the patient. The therapeutic mechanism of the stent implantation is that the covered stent is delivered to a diseased region through a delivery sheath and then released, and the stent is expanded at the diseased region to open a blocked blood vessel or isolate hemangioma from blood to eliminate the risk of death caused by rupture and heavy bleeding of the aneurysm or reduce the compression of the tumor body on peripheral tissues and organs. Some mature scaffolds such as Gore Viabahn, Bard fluent, Aegis, Ankura, etc. are available in the art.

The flexibility of the stent has been the focus of research on the clinical application of the stent product, especially in the peripheral vascular field. By "compliant" is meant that the shape of the stent can conform to the shape of the vessel, changing as the shape of the vessel changes. The stent with good flexibility can have good adherence with blood vessels when being implanted into a lesion part, and no gap is left between the outer wall of the stent and the blood vessels. In peripheral blood vessels, most of lesions are vascular embolisms, and the diameter of the blood vessels subjected to embolisms is smaller, and the anatomical morphology is tortuous, so that the requirement on the flexibility of the stent is higher. The laser cutting stent has flexible designability, and in order to maintain the flexibility of the stent, when a tube is cut to form the stent, the stent needs to be designed into an open-loop structure, but when the stent with the open-loop structure is ejected and released from a conveying sheath tube, the stent is easy to be compressed and deformed to cause stent shortening and membrane folding, so that hemodynamics passing through the inner cavity of the stent is influenced, and phenomena such as vortex is generated. However, the hemodynamic changes tend to activate thrombus formation inside the stent, causing problems with restenosis within the stent.

Disclosure of Invention

The invention aims to provide a medical stent, aiming at changing the structure of the medical stent so as to keep the axial length when the medical stent is in a compressed state and is subjected to axial pressure, avoiding the problems of shortening, film covering folds and the like and improving the treatment effect.

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

the medical stent is configured to: when the medical stent is at least partially in a compressed state and is subjected to axial pressure, two adjacent wave rings abut against each other or have a preset interval so as not to reduce the axial length of the medical stent.

Optionally, the wave ring comprises wave crests and wave troughs alternately arranged along the circumferential direction of the medical stent, and at least one wave crest and/or at least one wave trough are spaced between two adjacent connecting rods on the same wave ring.

Optionally, the connecting rod is of a linear configuration extending along the axial direction of the medical stent, and two opposite ends of the connecting rod are respectively connected with wave crests of two adjacent wave rings or wave troughs of two adjacent wave rings;

the edge lines of the convex side of the wave crest and the edge lines of the convex side of the wave trough extend along the circumferential direction of the medical stent, so that when at least part of the medical stent is in the compressed state and is subjected to axial pressure, two adjacent wave rings are abutted against each other.

Optionally, the size of the edge line of the convex side of the wave crest and the edge line of the convex side of the wave trough in the circumferential direction of the medical stent is 0.1mm-5 mm.

Optionally, the connecting rod includes a first sub-connecting rod, the first sub-connecting rod is of a Z-shaped structure and includes a first rod body, a second rod body and a third rod body which are connected in sequence, the first rod body and the third rod body extend along the axial direction of the medical support, and the second rod body extends along the circumferential direction of the medical support; the concave side of the wave crest of one of the two adjacent wave rings is connected with the first rod body, and the concave side of the wave trough of the other wave ring is connected with the second rod body, so that when the medical stent is at least partially in the compressed state and is subjected to axial pressure, the two adjacent wave rings respectively abut against two sides of the second rod body to form the preset distance; and/or the presence of a gas in the gas,

the connecting rods comprise second sub-connecting rods which extend along the circumferential direction of the medical support; the convex side of the wave crest of one wave ring and the convex side of the wave trough of the other wave ring in two adjacent wave rings are respectively connected with two ends of the second sub-connecting rod, so that when at least part of the medical stent is in the compressed state and is subjected to axial pressure, the two adjacent wave rings respectively abut against two sides of the second sub-connecting rod to form the preset distance.

The connecting rod comprises a first sub-connecting rod, the first sub-connecting rod is of a Z-shaped structure and comprises a first rod body, a second rod body and a third rod body which are sequentially connected, the first rod body and the third rod body extend along the axial direction of the medical support, and the second rod body extends along the circumferential direction of the medical support; the concave side of the wave crest of one wave ring of the two adjacent wave rings is connected with the first rod body, and the concave side of the wave trough of the other wave ring is connected with the second rod body, so that when the medical support is at least partially in the compressed state and is subjected to axial pressure, the two adjacent wave rings respectively abut against two sides of the second rod body to form the preset distance; and/or the presence of a gas in the gas,

the connecting rod comprises a second sub-connecting rod, the second sub-connecting rod is of a Z-shaped structure and comprises a fourth rod body, a fifth rod body and a sixth rod body which are sequentially connected, wherein the fourth rod body and the sixth rod body extend along the circumferential direction of the medical support, and the fifth rod body extends along the axial direction of the medical support; the convex side of the wave trough of one wave ring of two adjacent wave rings is connected with the fourth rod body, and the convex side of the wave crest of the other wave ring is connected with the sixth rod body, so that when the medical support is at least partially in the compressed state and is subjected to axial pressure, the one wave ring abuts against the proximal end side of the fourth rod body, and meanwhile the other wave ring abuts against the distal end side of the sixth rod body to have the preset distance.

Optionally, when the connecting rod includes the first sub-connecting rod and the second sub-connecting rod, the first sub-connecting rod and the second sub-connecting rod are respectively located at two axial sides of the same wave ring, and the first sub-connecting rod and the second sub-connecting rod are alternately arranged in the circumferential direction of the medical stent.

Optionally, all of the first sub-connecting rods are arranged in a plurality of first helical structures around the axis of the medical stent, while all of the second sub-connecting rods are arranged in a plurality of second helical structures around the axis of the medical stent.

Optionally, the first helical structure and the second helical structure are arranged at equal intervals in the circumferential direction of the medical stent.

Optionally, the number of said peaks per said wave turn is 4-20; and/or the presence of a gas in the gas,

the number of the connecting rods is 2-10; and/or the presence of a gas in the gas,

the axial length of the wave ring is 1mm-20 mm.

Optionally, the wave ring comprises a plurality of bracket edges connected end to end in sequence, and two adjacent bracket edges are connected at an angle to form the wave crest or the wave trough; the included angle formed by two adjacent bracket edges is 10-80 degrees.

Optionally, the medical stent further comprises an outer covering membrane and/or an inner covering membrane, the outer covering membrane is arranged on the outer surface of the stent body, and the inner covering membrane is arranged on the inner surface of the stent body.

In order to achieve the above object, the present invention further provides another medical stent, which includes a stent body, wherein the stent body includes a plurality of wave rings sequentially connected along an axial direction of the medical stent, the wave rings include wave crests and wave troughs alternately arranged along a circumferential direction of the medical stent, and end portions of the wave crests and the wave troughs extend along the circumferential direction of the medical stent.

Optionally, the stent body further comprises a connecting rod, and the plurality of wave rings are connected through the connecting rod; the opposite ends of the connecting rod are respectively connected with the wave crests of the two adjacent wave rings or connected with the wave troughs of the two adjacent wave rings.

In order to achieve the above object, the present invention further provides another medical stent, which comprises a stent body, wherein the stent body comprises a plurality of wave rings and connecting rods, the plurality of wave rings are sequentially arranged along an axial direction of the medical stent, and the plurality of wave rings are connected through the connecting rods; the opposite ends of the connecting rod are respectively connected with the wave crests and the wave troughs of the two adjacent wave rings; the connecting rod includes first sub-connecting rod and/or second sub-connecting rod, first sub-connecting rod is Z type structure, second sub-connecting rod is followed medical support's circumference extends and/or second sub-connecting rod is Z type structure.

Optionally, two opposite ends of the first sub-connecting rod are respectively connected with the concave side of the wave crest and the concave side of the wave trough of two adjacent wave rings.

Optionally, two opposite ends of the second sub-connecting rod are respectively connected with the convex side of the wave crest and the convex side of the wave trough of two adjacent wave rings.

Optionally, the first sub-connecting rods and the second sub-connecting rods are respectively located at two axial sides of the same wave ring, and the first sub-connecting rods and the second sub-connecting rods are alternately arranged in the circumferential direction of the medical stent.

Compared with the prior art, the medical bracket has the following advantages:

the medical stent comprises a stent body, wherein the stent body comprises a plurality of wave rings and connecting rods, the wave rings are sequentially arranged along the axial direction of the medical stent, and the wave rings are connected through the connecting rods; the medical stent is configured in such a way that when the medical stent is at least partially in a compressed state and is subjected to axial pressure, two adjacent wave rings abut against each other or have a preset distance, so that the axial length of the medical stent is not reduced, the shortening of the medical stent is overcome, the hemodynamics change caused by the membrane folding is avoided, and the treatment effect is improved.

Drawings

The drawings are included to provide a better understanding of the invention and are not to be construed as unduly limiting the invention. Wherein:

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

FIG. 2 is a radial cross-sectional view of the medical stent shown in FIG. 1;

FIG. 3 is an enlarged schematic view of the medical stent shown in FIG. 1;

FIG. 4 is a schematic view of a medical stent compressed within a delivery sheath according to one embodiment of the present invention;

fig. 5 is a schematic view of a medical stent being ejected from a delivery sheath for release in accordance with an embodiment of the present invention;

FIG. 6 is a schematic structural view of a medical stent provided in accordance with another embodiment of the present invention;

FIG. 7 is an enlarged schematic view of the medical stent of FIG. 6;

FIG. 8 is a schematic view of a medical stent compressed within a delivery sheath according to another embodiment of the present invention;

fig. 9 is a schematic view of a medical stent being ejected from a delivery sheath for release in accordance with another embodiment of the present invention;

FIG. 10 is a schematic view of a medical stent provided by an embodiment of the present invention when a stent body is connected with an inner covering membrane and an outer covering membrane.

[ reference numerals are described below ]:

1000-stent body;

1100-wave ring;

1100 a-first, 1100 b-second, 1100 c-third;

1110-peak, 1120-trough;

1101-a bracket edge;

1200-a connecting rod;

1210-a first sub-connecting rod;

1211-a first shaft, 1212-a second shaft, 1213-a third shaft;

1220-a second subconnector rod;

1310-outer covering film, 1320-inner covering film;

1-conveying sheath pipe, 2-pushing rod;

10-laminating tooling, 20-isolating film and 30-heat-shrinkable tube.

Detailed Description

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the present embodiment are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.

Furthermore, each of the embodiments described below has one or more technical features, and thus, the use of the technical features of any one embodiment does not necessarily mean that all of the technical features of any one embodiment are implemented at the same time or that only some or all of the technical features of different embodiments are implemented separately. In other words, those skilled in the art can selectively implement some or all of the features of any embodiment or combinations of some or all of the features of multiple embodiments according to the disclosure of the present invention and according to design specifications or implementation requirements, thereby increasing the flexibility in implementing the invention.

As used in this specification, the singular forms "a", "an" and "the" include plural referents, and the plural forms "a plurality" includes more than two 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. Either directly or indirectly through intervening media, either internally or in any other relationship. 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 core idea of the invention is to provide a medical stent, which comprises a stent body, wherein the stent body comprises a plurality of wave rings and connecting rods, the wave rings are sequentially arranged along the axial direction of the medical stent, and the wave rings are connected through the connecting rods. When the medical stent is at least partially in a compressed state and is subjected to axial pressure, two adjacent wave rings are abutted against each other or have a preset distance, so that the axial length of the medical stent is not reduced, the problems of medical stent shortening and tectorial membrane folding can be overcome, the adverse consequences of thrombus, stent restenosis and the like caused by dynamic change of blood flow flowing through the inner cavity of the medical stent can be avoided, and the treatment effect is improved.

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. The same or similar reference numbers in the drawings identify the same or similar elements.

Referring to fig. 1, 3, 7 and 8, the medical stent includes a stent body 1000, the stent body 1000 includes a plurality of wave rings 1100 and a connecting rod 1200, the plurality of wave rings 1100 are sequentially arranged along an axial direction of the medical stent, and the plurality of wave rings 1100 are connected by the connecting rod 1200. The medical stent is configured such that when the medical stent is at least partially in a compressed state and subjected to an axial pressure, adjacent two of the wave rings 1100 abut against each other or have a predetermined spacing so as not to reduce the axial length of the medical stent. The axial pressure refers to that the near end of the medical support is subjected to an external force pointing to the far end, and/or the far end of the medical support is subjected to an external force pointing to the near end. The terms "proximal" and "distal" refer to the relative orientation, relative position, and orientation of elements or actions with respect to one another from the perspective of a clinician using the medical device, and although "proximal" and "distal" are not intended to be limiting, proximal generally refers to the end of the medical device that is closer to the clinician during normal operation, and distal generally refers to the end that is first introduced into a patient. Taking the orientation shown in fig. 1, 3, 5, and 6 as an example, the proximal end refers to the left end, and the distal end refers to the right end.

Further, referring to fig. 2, the medical stent further includes a coating, and the material of the coating includes, but is not limited to, at least one of ultra-high molecular weight polyethylene (UHMWPE), Polyurethane (PU), expanded polytetrafluoroethylene (ePTFE), or Polytetrafluoroethylene (PTFE). The covering membrane is disposed on at least the outer surface or the inner surface of the stent body 1000, preferably on both the outer surface and the inner surface, i.e., the covering membrane includes both an outer covering membrane 1310 and an inner covering membrane 1320. The medical stent is described hereinafter as including an outer cover 1310 and an inner cover 1320.

By reasonably designing the structure of the stent body 1000, when the medical stent is at least partially in the compressed state and is subjected to axial pressure, two adjacent wave rings 1100 are abutted against each other or spaced at a preset interval, so that the problem of shortening of the medical stent when the medical stent is ejected out and released from a delivery sheath tube is solved, the outer covering film 1310 and the inner covering film 1320 are prevented from being folded, and then the conditions of thrombus, stent restenosis and the like caused by hemodynamic change when blood flows through the inner cavity of the medical stent are avoided.

Next, an implementation of the present invention will be described herein with reference to the accompanying drawings. It will be understood by those skilled in the art that the following description is provided by way of example only, and not by way of a required selection, and is not intended to limit the present invention.

Referring back to fig. 1, the wave ring 1100 includes wave crests 1110 and wave troughs 1120 alternately arranged along the circumference of the medical stent. Specifically, the wave ring 1100 includes a plurality of stent ribs 1101 connected end to end in sequence, and two adjacent stent ribs 1101 are connected at an angle to form the wave crest 1110 and the wave trough 1120. Herein, for the same wave ring 1100, the convex side of the wave crest 1110 faces the proximal end of the medical stent, the concave side faces the distal end of the medical stent, the convex side of the wave trough 1120 faces the distal end of the medical stent, and the concave side faces the proximal end of the medical stent. At least one wave crest 1110 and/or one wave trough 1120 are spaced between two adjacent connecting rods 1200 on the same wave ring 1100, so as to maintain the flexibility of the medical stent.

In one embodiment, as shown in fig. 1, two adjacent wave coils 1100 preferably have the same phase, and for convenience, three wave coils 1100 sequentially arranged along the axial direction of the medical stent are referred to herein as a first wave coil 1100a, a second wave coil 1100b, and a third wave coil 1100c, respectively, where the first wave coil 1100a is adjacent to the second wave coil 1100b, and the second wave coil 1100b is adjacent to the third wave coil 1100 c. The connecting rod 1200 is a linear configuration extending along the axial direction of the medical stent. Wherein, opposite ends of a part of the connection rod 1200 are respectively connected to a concave side of the wave crest 1110 of the first wave ring 1100a and a convex side of the wave crest 1110 of the second wave ring 1100b, and opposite ends of another part of the connection rod 1200 are respectively connected to a convex side of the wave trough 1120 of the second wave ring 1100b and a concave side of the wave trough 1120 of the third wave ring 1100 c.

As shown in fig. 3 and 4, in the present embodiment, the ends of the wave crests 1110 and the wave troughs 1120 of the wave ring 1100 extend in the circumferential direction of the medical stent. Specifically, the end of the wave crest 1110 refers to the convex side of the wave crest 1110, that is, the edge line of the convex side of the wave crest 1110 of the wave ring 1100 extends in the circumferential direction of the medical stent. Similarly, the end of the wave trough 1120 refers to the convex side of the wave trough 1120, so the edge line of the convex side of the wave trough 1120 also extends along the circumferential direction of the medical stent. In other words, when the medical stent is in the deployed state, the edge lines of the convex side of the wave crest 1110 and the edge lines of the convex side of the wave trough 1120 are both linear. The "expanded state" refers to a state in which the medical stent is cut along the axis of the medical stent and is stretched into a planar structure.

Fig. 4 shows a schematic view of the medical stent compressed in the delivery sheath 1, and fig. 5 shows a schematic view when an ejector rod 2 applies an axial pressure F at the proximal end of the medical stent inside the delivery sheath 1 to eject the medical stent out of the delivery sheath 1. Referring to fig. 4 and 5, the linear edge lines of the troughs 1120 of the first wave ring 1100a and the linear edge lines of the crests 1110 of the second wave ring 1100b abut against each other, so that the troughs 1120 of the first wave ring 1100a cannot enter the gaps between two adjacent crests 1110 of the second wave ring 1110b, and similarly, the crests 1110 of the second wave ring 1100b cannot enter the gaps between two adjacent troughs 1120 of the first wave ring 1100a, so as to maintain the axial length of the medical stent. Similarly, the linear edge line of the trough 1120 of the second wave coil 1100b abuts against the linear edge line of the crest 1110 of the third wave coil 1100 c.

Optionally, the edge line of the convex side of the wave crest 1110 has a size of 0.1mm to 5mm in the circumferential direction of the medical stent. The size of the edge line of the convex side of the wave trough 1120 in the circumferential direction of the medical stent is also 0.1mm-5 mm. The method is specifically set according to actual needs.

In another embodiment, when the medical stent is in the compressed state and is subjected to axial pressure, two adjacent wave rings 1100 abut against two opposite sides of the connecting rod 1200, so that the two adjacent wave rings 1100 maintain the predetermined distance to overcome the shortening.

In detail, as shown in fig. 6 to 9, the connection rod 1200 includes a first sub-connection rod 1210 and a second sub-connection rod 1220. The first sub-connecting rod is of a Z-shaped structure and comprises a first rod 1211, a second rod 1212 and a third rod 1213 which are connected in sequence. The first rod 1211 and the third rod 1213 extend in the axial direction of the medical stent, and the second rod 1212 extends in the circumferential direction of the medical stent. The second sub-connecting rod 1220 extends in the circumferential direction of the medical stent. In this embodiment, it is preferable that both the first sub-connecting rods 1110 and the second sub-connecting rods 1120 are disposed on the same wave ring 1100, the first sub-connecting rods 1210 and the second sub-connecting rods 1220 are disposed on both axial sides of the wave ring 1100, and the first sub-connecting rods 1100 and the second sub-connecting rods 1120 are alternately disposed in the circumferential direction of the medical stent.

Please refer to fig. 6 and 7, wherein the first wave ring 1100a and the second wave ring 1100b are connected by the first sub-connecting rod 1210, and taking the medical stent shown in fig. 6 as an example, the concave side of the wave crest 1110 of the first wave ring 1100a is connected with the first rod 1211 of the first sub-connecting rod 1210, and the concave side of the wave trough 1120 of the second wave ring 1100b is connected with the third rod 1213 of the first sub-connecting rod 1210. The convex side of the wave trough 1120 of the second wave ring 1100b is connected with the convex side of the wave crest 1110 of the third wave ring 1100c through the second sub-connecting rod 1210.

Fig. 8 shows a schematic view of the medical stent provided in the present embodiment compressed in the delivery sheath 1, and fig. 9 shows a schematic view when an ejector rod 2 applies an axial pressure F to the proximal end of the medical stent inside the delivery sheath 1 to eject the medical stent out of the delivery sheath 1. At this time, the first wave ring 1100a and the second wave ring 1100b respectively abut against two opposite sides of the second rod body 1212 of the first sub-connecting rod 1210, so that the first wave ring 1100a and the second wave ring 1100b have the predetermined distance therebetween, and the predetermined distance is the dimension of the second rod body 1212 in the axial direction of the medical stent. The second wave ring 1100b and the third wave ring 1100c respectively abut against opposite sides of the second sub-connecting rod 1220 to have the predetermined interval, where the predetermined interval is a size of the second sub-connecting rod 1220 in a circumferential direction of the medical stent.

In this embodiment, the widths of the first sub-connecting rod 1210 and the second sub-connecting rod 1220 may be 0.1mm to 2 mm. It can be understood that, for the first sub-connecting rod 1210, the "width" refers to the dimension of the first rod 1211 and the third rod 1213 in the circumferential direction of the medical stent, and the dimension of the second rod 1212 in the axial direction of the medical stent. Similarly, the "width" of the second sub-connecting rod 1220 refers to the dimension of the second sub-connecting rod 1220 in the axial direction of the medical stent.

Referring back to fig. 6 and 7, all of the first sub-connecting rods 1110 are arranged in a plurality of first helical structures around the axis of the medical stent, while all of the second sub-connecting rods 1120 are arranged in a plurality of second helical structures around the axis of the medical stent, such that the first helical structures and the second helical structures are alternately arranged in the circumferential direction of the medical stent. Further, the first helical structure and the second helical structure are arranged at equal intervals in the circumferential direction of the medical stent. So set up for medical support compromises compliance and prevents the foreshortening nature, has good result of use. In a specific medical stent, on the same wave ring 1100, for example, on the second wave ring 1100b, three wave troughs 1120 and two wave crests 1110 are spaced between two adjacent first sub-connecting rods 1210, and three wave troughs 1120 and two wave crests 1110 are also spaced between two adjacent second sub-connecting rods 1120.

It will be appreciated by those skilled in the art that in alternative embodiments, the connector bar 1200 does not necessarily have both the first sub-connector bar 1110 and the second sub-connector bar 1120. Indeed, in some implementations, the connecting rod 1200 may only include the first sub-connecting rod 1110, or the connecting rod 1200 only includes the second sub-connecting rod 1120, both of which may serve to reduce shortening and improve the therapeutic effect.

In addition, in other embodiments, the second sub-connecting rod may also be a Z-shaped structure, and include a fourth rod body, a fifth rod body and a sixth rod body that are connected in sequence, where the fourth rod body and the sixth rod body extend along the circumferential direction of the medical stent, and the fifth rod body extends along the axial direction of the medical stent. Taking the fourth rod body of the second sub-connecting rod connected with the convex side of the trough of the second wave ring, and the sixth rod body connected with the convex side of the peak of the third wave ring as an example, when the medical stent is at least partially in the compressed state and is subjected to axial pressure, the convex side of the trough of the second wave ring abuts against the proximal end side of the fourth rod body, and the convex side of the peak of the third wave ring abuts against the distal end side of the sixth rod body (not shown in the figure).

Or, the first sub-connecting rod and the second sub-connecting rod of two structures are simultaneously included in one medical bracket. That is, in one of the medical stents, a part of the second sub-connecting rods extends in the circumferential direction of the medical stent, and the other part of the second sub-connecting rods has a Z-shaped structure.

As mentioned above, the medical stent includes the stent body 1000, the outer covering film 1310 and the inner covering film 1320, and the processing method of the medical stent is described below.

First, the stent body 1000 is obtained by laser engraving a tube. The medical stent includes but is not limited to a self-expandable stent, when the medical stent is a self-expandable stent, the material of the tube may be a shape memory alloy or a material with high resilience, such as a titanium-based alloy, a cobalt-chromium alloy, stainless steel, etc., and the titanium-based alloy may be selected from a nickel-titanium alloy.

Next, the outer film 1310 and the inner film 1320 are disposed on the stent body 1000. Specifically, referring to fig. 10, a film coating tool 10 is selected according to the diameter of the stent body 1000, an isolation film 20 is coated on the outer surface of the film coating tool 10, and then the inner coating 1320 is disposed on the outer surface of the isolation film 20. Thereafter, the stent body 1000 is sleeved on the outer surface of the inner coating 1320, and the outer coating 1310 is coated on the outer surface of the stent body 1000. Subsequently, another layer of the separation film 20 is disposed on the outer surface of the outer coating film 1310, and a heat shrinkable tube 30 is sleeved on the outer surface of the another layer of the separation film 20.

Next, the heat shrinkable tube 30 is heated to a predetermined temperature to couple the outer cover 1310 and the inner cover 1320 to the stent body 1000.

And finally, removing the heat shrinkable tube 30 and the isolating membrane 20, and taking down the medical support from the membrane covering tool 10.

Those skilled in the art will appreciate that the lamination tool 10 is conventional in the art, and the structure thereof is common general knowledge and will not be described herein. In addition, in this embodiment, the heat shrinkable tube 20 may be heated by a heat treatment furnace.

In this embodiment, according to actual needs, each of the wave rings 1100 of the medical stent may have 4 to 20 wave crests 1110, and the number of the wave troughs 1120 corresponds to that of the wave crests 1110, that is, the number of the wave troughs 1120 is also 4 to 20. The number of the connection rods 1200 is 2-10. When the medical stent is in an expanded state, the distance from the wave crest 1110 to the wave trough 1120 (i.e. the axial length of the wave ring 1100) along the axial direction of the medical stent is 1mm to 20mm, and the angle α (shown in fig. 1) formed between two adjacent stent ridges 1101 is 10 ° to 80 °. In addition, the diameter of the medical stent is not limited in the present invention, and in some embodiments, the medical stent has a uniform diameter (including an inner diameter and an outer diameter) in all axial directions, that is, the medical stent is an isodiametric stent; in other embodiments, the medical stent has different diameters at different axial positions, i.e. the medical stent is a variable diameter stent. The outer diameter of the medical stent is selected within 2mm-30mm according to the diameter of a diseased vessel, and the wall thickness of the stent body 1000 is 0.1mm-5 mm.

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.

Claims

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

the medical stent is configured to: when the medical stent is at least partially in a compressed state and subjected to axial pressure, two adjacent stent rings abut against each other or have a predetermined interval so as not to reduce the axial length of the medical stent.

2. The medical stent of claim 1, wherein the wave ring comprises wave crests and wave troughs alternately arranged along the circumferential direction of the medical stent, and at least one wave crest and/or at least one wave trough is/are spaced between two adjacent connecting rods on the same wave ring.

3. The medical stent of claim 2, wherein the connecting rod is of a straight-line configuration extending along the axial direction of the medical stent, and two opposite ends of the connecting rod are respectively connected with the wave crests of two adjacent wave rings or the wave troughs of two adjacent wave rings;

4. The medical stent according to claim 3, wherein the dimension of the edge line of the convex side of the wave crest and the edge line of the convex side of the wave trough in the circumferential direction of the medical stent is 0.1mm to 5 mm.

5. The medical stent of claim 2, wherein the connecting rod comprises a first sub-connecting rod, the first sub-connecting rod is of a Z-shaped structure and comprises a first rod body, a second rod body and a third rod body which are connected in sequence, the first rod body and the third rod body extend along the axial direction of the medical stent, and the second rod body extends along the circumferential direction of the medical stent; the concave side of the wave crest of one wave ring of the two adjacent wave rings is connected with the first rod body, and the concave side of the wave trough of the other wave ring is connected with the second rod body, so that when the medical support is at least partially in the compressed state and is subjected to axial pressure, the two adjacent wave rings respectively abut against two sides of the second rod body to form the preset distance; and/or the presence of a gas in the gas,

6. The medical stent of claim 2, wherein the connecting rod comprises a first sub-connecting rod, the first sub-connecting rod is of a Z-shaped structure and comprises a first rod body, a second rod body and a third rod body which are connected in sequence, the first rod body and the third rod body extend along the axial direction of the medical stent, and the second rod body extends along the circumferential direction of the medical stent; the concave side of the wave crest of one wave ring of the two adjacent wave rings is connected with the first rod body, and the concave side of the wave trough of the other wave ring is connected with the second rod body, so that when the medical support is at least partially in the compressed state and is subjected to axial pressure, the two adjacent wave rings respectively abut against two sides of the second rod body to form the preset distance; and/or the presence of a gas in the gas,

7. The medical stent according to claim 5 or 6, wherein when the connecting rods include the first sub-connecting rods and the second sub-connecting rods, the first sub-connecting rods and the second sub-connecting rods are located on both axial sides of the same undulating ring, respectively, and the first sub-connecting rods and the second sub-connecting rods are alternately arranged in a circumferential direction of the medical stent.

8. The medical stent of claim 7, wherein all of the first sub-connecting rods are arranged in a plurality of first helical configurations about the axis of the medical stent, while all of the second sub-connecting rods are arranged in a plurality of second helical configurations about the axis of the medical stent.

9. The medical stent of claim 8, wherein the first helical structure and the second helical structure are arranged at equal intervals in a circumferential direction of the medical stent.

10. The medical stent of any one of claims 2 to 6, wherein the number of peaks of each of the wave turns is 4 to 20; and/or the presence of a gas in the gas,

the axial length of the wave ring is 1mm-20 mm.

11. The medical stent of claim 2, wherein the wave ring comprises a plurality of stent ribs connected end to end in sequence, two adjacent stent ribs being connected at an angle to form the wave crest or the wave trough; the included angle formed by two adjacent bracket edges is 10-80 degrees.

12. The medical stent of claim 1 or 2, further comprising an outer coating and/or an inner coating, the outer coating being disposed on an outer surface of the stent body and the inner coating being disposed on an inner surface of the stent body.

13. The medical stent is characterized by comprising a stent body, wherein the stent body comprises a plurality of wave rings which are sequentially connected along the axial direction of the medical stent, the wave rings comprise wave crests and wave troughs which are alternately arranged along the circumferential direction of the medical stent, and the end parts of the wave crests and the wave troughs extend along the circumferential direction of the medical stent.

14. The medical stent of claim 13, wherein said stent body further comprises a connecting rod, and a plurality of said undulating rings are connected by said connecting rod; the opposite ends of the connecting rod are respectively connected with the wave crests of the two adjacent wave rings or connected with the wave troughs of the two adjacent wave rings.

15. A medical stent is characterized by comprising a stent body, wherein the stent body comprises a plurality of wave rings and connecting rods, the wave rings are sequentially arranged along the axial direction of the medical stent, and the wave rings are connected through the connecting rods; the opposite ends of the connecting rod are respectively connected with the wave crests and the wave troughs of the two adjacent wave rings; the connecting rod includes first sub-connecting rod and/or second sub-connecting rod, first sub-connecting rod is Z type structure, second sub-connecting rod is followed medical support's circumference extends and/or second sub-connecting rod is Z type structure.

16. The medical stent as defined in claim 15, wherein opposite ends of said first sub-connecting bar are connected to concave sides of peaks and concave sides of valleys of adjacent two of said wave rings, respectively.

17. The medical stent as defined in claim 15, wherein opposite ends of said second sub-connecting bar are connected to the convex side of the peak and the convex side of the valley of two adjacent said wave rings, respectively.

18. The medical stent of claim 15, wherein the first sub-connecting rods and the second sub-connecting rods are located on both axial sides of the same undulating ring, respectively, and the first sub-connecting rods and the second sub-connecting rods are alternately arranged in a circumferential direction of the medical stent.