A vascular stent capable of preventing the covering from slipping off

Abstract

The present invention provides a vascular stent that prevents the coating from slipping off, comprising a coating and a main support frame arranged on the coating, the main support frame comprising an end ring support frame partially exposing the coating, the vascular stent also comprising an anti-slipping piece, the anti-slipping piece being arranged between the end ring support frame and the coating, the anti-slipping piece being used to fix the coating to the vascular stent to prevent the coating from slipping off and wrinkling.

Description

Technical Field

[0001] The invention relates to the technical field of implantable blood vessels, and in particular to a blood vessel stent capable of preventing a covering film from slipping off. Background Art

[0002] With the improvement of people's living standards and changes in lifestyles, the incidence of vascular diseases is getting higher and higher. If these diseases are not treated in time, they may lead to vascular blockage, aneurysm and other diseases, which will seriously endanger human life safety.

[0003] At present, minimally invasive interventional procedures can be used to treat vascular diseases. This method is less traumatic to patients, highly safe, and highly effective. Therefore, it is recognized by doctors and patients and has become an important treatment method for vascular diseases. Interventional treatment refers to the use of a delivery system to implant a vascular stent into the patient's vascular disease segment. The implanted vascular stent can expand to support the narrowed and occluded segment of the blood vessel or block the rupture of the vascular dissection, reduce the elastic retraction and reshaping of the blood vessel, maintain smooth blood flow in the lumen, and also has the effect of preventing restenosis.

[0004] Currently, commonly used vascular stents include two categories: coated stents and bare metal stents. Coated stents are bare metal stents with a coating, which can completely isolate blood flow and diseased blood vessels, thereby eliminating the fatal risk of blood vessel rupture. Many existing coated stents are provided with a section of annular support frame that is not sutured to the coating at the end. The vascular stent can be fixed on the conveyor by using this section of annular support frame exposed outside the coating. This type of vascular stent needs to be implanted into the human body through intervention during use. This method requires the artificial coated stent to be compressed into the delivery and release device, and guided into the human body along the pre-implanted guide wire. With the assistance of the imaging system, the delivery and release device is accurately delivered to the diseased position of the blood vessel, and then the coated stent is released.

[0005] There are some drawbacks in the structural design of this type of covered stent currently on the market, such as the easy slipping of the covered film during the release of the covered stent by the conveyor, and the loose connection between the covered film and the stent. These adverse factors will cause the covered vascular stent to have a poor deployment shape in the blood vessel, poor flexibility, and irregular expanded inner diameter, which will lead to poor adhesion of the covered stent to the blood vessel wall, and then cause blood flow obstruction or unsealed dissection rupture, resulting in treatment failure or even the need for secondary surgery. Summary of the invention

[0006] The object of the present invention is to provide a vascular stent capable of preventing the covering from slipping off.

[0007] In order to solve the above technical problems, the present invention provides a vascular stent that prevents the coating from slipping off, which includes a coating and a main support frame arranged on the coating, the main support frame includes an end ring support frame partially exposing the coating, the vascular stent also includes an anti-slipping piece, the anti-slipping piece is arranged between the end ring support frame and the coating, and the anti-slipping piece is used to fix the coating to the vascular stent to prevent the coating from slipping off and wrinkling.

[0008] The vascular stent provided by the present invention fixes the end of the coating on the end ring support frame through the anti-slipping piece to prevent the coating from slipping off and wrinkling. Therefore, during the release process of the vascular stent through the conveyor, since the coating is stably fixed on the end ring support frame through the anti-slipping piece, it can be ensured that the coating will not slip off and wrinkle, so that the vascular stent has a good deployment shape in the blood vessel, better flexibility, and a regular expanded inner diameter, so that the vascular stent is well attached to the blood vessel wall, which can prevent blood flow obstruction or unblocked interlayer rupture. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings required for use in the implementation mode will be briefly introduced below. Obviously, the drawings described below are some implementation modes of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0010] Figure 1 It is a schematic diagram of the structure of the vascular stent provided in the first embodiment of the present invention.

[0011] Figure 2 yes Figure 1 A partial enlarged view of the vascular stent.

[0012] Figure 3 yes Figure 1 Schematic diagram of the three-dimensional structure of the end ring support frame.

[0013] Figure 4 It is a schematic structural diagram of a vascular stent provided in the second embodiment of the present invention.

[0014] Figure 5 yes Figure 4 A partial enlarged view of the vascular stent.

[0015] Figure 6 It is a schematic diagram of the structure of a vascular stent provided in the third embodiment of the present invention.

[0016] Figure 7 It is a schematic structural diagram of a vascular stent provided in the fourth embodiment of the present invention.

[0017] Figure 8 yes Figure 7A partial enlarged view of the vascular stent.

[0018] Fig. 9 It is a schematic diagram of the structure of a vascular stent provided in the fifth embodiment of the present invention.

[0019] Fig.10 yes Fig. 9 A partial enlarged view of the vascular stent.

[0020] Fig.11 It is a schematic diagram of the structure of a vascular stent provided in the sixth embodiment of the present invention.

[0021] Fig.12 It is a schematic diagram of the structure of a vascular stent provided in the seventh embodiment of the present invention.

[0022] Fig.13 It is a schematic diagram of the structure of a vascular stent provided in the eighth embodiment of the present invention. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] In addition, the following descriptions of the embodiments are with reference to the attached drawings to illustrate specific embodiments in which the present invention may be implemented. The directional terms mentioned in the present invention, such as "upper", "lower", "front", "back", "left", "right", "inner", "outer", "side", etc., are only with reference to the directions of the attached drawings. Therefore, the directional terms used are for better and clearer description and understanding of the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0025] In the description of the present invention, the "proximal end" of the present invention refers to the end close to the heart, and the "distal end" refers to the end far from the heart. The high and low mentioned in the present invention are relative to the coating. The end surface beyond the coating is called high, and the end surface not beyond the coating is called low. This definition is only for the convenience of expression and cannot be understood as a limitation of the present invention.

[0026] See also Figure 1 and Figure 2 , Figure 1 is a schematic structural diagram of a vascular stent provided by a first embodiment of the present invention; Figure 2 yes Figure 1A partial enlarged view of the vascular stent in the figure. The present invention provides a vascular stent 100 for preventing the coating from slipping off, which includes a tubular coating 20, a main support frame 40 arranged on the coating 20, and an anti-slipping member. The main support frame 40 includes a plurality of Z-shaped or sinusoidal annular corrugated support rods 41, and an end annular support frame 42 partially exposing the end surface of the coating 20, and the plurality of annular corrugated support rods 41 are arranged at intervals along the axial direction of the coating 20; the anti-slipping member is arranged between the end annular support frame 42 and the coating 20, and the anti-slipping member is used to fix the coating 20 at the end of the vascular stent 100 to prevent the coating 20 from slipping off and wrinkling.

[0027] In this embodiment, the end annular support frame 42 is disposed at the proximal end of the coating 20, and the proximal end of the coating 20 has a proximal surface 23. The proximal end of the end annular support frame 42 exposes the proximal surface 23 of the coating 20, that is, the proximal end of the end annular support frame 42 is higher than the proximal surface 23, and the distal end of the proximal end of the end annular support frame 42 is lower than the proximal surface 23. The distal end of the end annular support frame 42 is connected to the coating 20 through an anti-slip component, so that the proximal end of the coating 20 is fixed to the end annular support frame 42.

[0028] The vascular stent 100 provided by the present invention fixes the end of the coating 20 on the end ring-shaped support frame 42 by means of the anti-slipping piece to prevent the coating 20 from slipping off and wrinkling. Therefore, during the release process of the vascular stent 100 through the conveyor, since the coating 20 is stably fixed on the end ring-shaped support frame 42 by means of the anti-slipping piece, it can be ensured that the coating 20 will not slip off and wrinkle, so that the vascular stent 100 is deployed in a good shape in the blood vessel, has good flexibility, and has a regular expanded inner diameter, so that the vascular stent 100 is well attached to the blood vessel wall, and blood flow obstruction or unblocked interlayer rupture can be prevented.

[0029] The shape of the transverse end surface of the coating 20 is circular or elliptical to match the blood vessel, and the coating 20 is made of polyester cloth, PTFE, PET or other polymer materials. These annular corrugated support rods 41 are sutured or attached to the coating 20, and these annular corrugated support rods 41 are arranged at intervals along the axial direction of the coating 20. Each annular corrugated support rod 41 can be an equal wave support rod or a high-low wave support rod, etc. The equal wave support rod refers to the height of each wave crest on the annular corrugated support rod 41 being the same, and the height of each wave trough is also the same, that is, each wave crest and each wave trough are respectively on the same plane; the high-low wave support rod refers to the height of each wave crest on the annular corrugated support rod 41 being different, and the height of each wave trough may also be different.

[0030] Each annular corrugated support rod 41 is made of an elastic metal material, and the metal material includes stainless steel or memory alloy. In this embodiment, each annular corrugated support rod 41 is woven by a superelastic nickel-titanium wire, and the superelastic nickel-titanium alloy wire can be selected from a wire diameter (i.e., a diameter range of 0.2 mm to 0.6 mm). Each annular corrugated support rod 41 is provided with a connecting sleeve, and the connecting sleeve connects the two opposite ends of the annular corrugated support rod 41.

[0031] Each annular corrugated support rod 41 can be sutured on the coating 20 by sutures, that is, the sutures can follow the waveform of each annular corrugated support rod 41 and accompany the entire main support frame 40. The sutures are preferably polymer sutures, which can be PTFE or PET sutures. The sutures can also suture each annular corrugated support rod 41 on the coating 20 through a number of suture knots distributed at non-equidistant intervals. The diameter of the sutures is selected in the range of 0.05mm-0.25mm.

[0032] In this embodiment, each annular corrugated support rod 41 is an equi-wave support rod, and the annular corrugated support rod 41 is woven with nickel-titanium wire with a diameter of 0.5 mm. The number of sine waves can be any number, and the vertical height of the annular corrugated support rod 41 can be any height.

[0033] In other embodiments, the annular corrugated support rod 41 is also a high-low corrugated support rod.

[0034] In other embodiments, each annular corrugated support rod 41 may also be adhered to the covering film 20 by medical glue.

[0035] like Figure 3 As shown, Figure 3 yes Figure 1 Schematic diagram of the three-dimensional structure of the end annular support frame in. The end annular support frame 42 can be an equal wave support rod or a high and low wave support rod, etc. Each Z-shaped or sinusoidal waveform of the end annular support frame 42 includes a crest 423, a trough 421 and a connecting rod 425 connected between the crest 423 and the trough 421. The end annular support frame 42 is made of an elastic metal material, and the metal material includes stainless steel or a memory alloy. Preferably, the end annular support frame 42 is woven by a superelastic nickel-titanium wire, and the superelastic nickel-titanium alloy wire can be selected in the wire diameter range of 0.2mm to 0.5mm. A connecting sleeve 427 is provided on the end annular support frame 42, and the connecting sleeve 427 connects the opposite ends of the end annular support frame 42, that is, the opposite ends of the end annular support frame 42 are both received in the connecting sleeve 427, and then the two ends of the nickel-titanium wire are fixed inside the connecting sleeve 427 by mechanical compression or welding.

[0036] In this embodiment, the end annular support frame 42 is an equi-wave support rod, and the end annular support frame 42 is woven from nickel-titanium wire with a diameter of 0.4 mm. The anti-slip component is a suture 60 sutured to the end annular support frame 42 and the coating 20, and the suture 60 can stably fix the coating 20 on the end annular support frame 60. The suture 60 is preferably a polymer suture, and the polymer suture can be a PTFE or PET suture. The suture 60 is spirally wound around the end annular support frame 42 and sutures the coating 20 to limit the axial movement of the coating 20.

[0037] The suture 60 is spirally wound at least at the intersection of the end annular support frame 42 and the proximal surface 23 of the coating 20, that is, the suture 60 is spirally wound at the intersection of the connecting rod 425 and the proximal surface 23 of the coating 20. Specifically, the suture 60 is spirally wound along the path of the end annular support frame 42 and sutures the coating 20 along the way. The suture 60 is sutured on the part or all of the rod body of the end annular support frame 42 that is higher than the proximal surface 23 of the coating 20; the suture 60 is sutured on the part or all of the rod body of the end annular support frame 42 that is lower than the proximal surface 23 of the coating 20.

[0038] In this embodiment, the suture 60 is spirally wound around the entire rod body of the end annular support frame 42. Specifically, the suture 60 is spirally wound around the end annular support frame 42 for one cycle. The suture 60 sutures the membrane 20 on the suture path with the end annular support frame 42, and the head and tail ends of the suture 60 are connected by knotting to obtain a knot 62. The knot 62 can tighten the suture 60, so that the suture 60 is tightly stretched on the end annular support frame 42; the suture 60 is connected between the membrane 20 and the end annular support frame 42, so that the membrane 20 is tightly stretched on the end annular support frame 42, so as to effectively prevent the proximal end of the membrane 20 from sliding or wrinkling relative to the end annular support frame 42 during the release of the vascular stent 100.

[0039] In other embodiments, a suture 60 is spirally wound around each trough 421 of the end annular support frame 42. Specifically, one end of the suture 60 is fixed to one of the connecting rods 425 connected to the trough 421 by tying a knot, and the other end of the suture is spirally wound around another connecting rod 425 connected to the trough along the trough path and fixed by tying a knot. The suture 60 sutures the covering film 20 on the suture path with the end annular support frame 42, and the knots on the two connecting rods 425 connected to the trough 421 are both higher than the proximal surface 23 of the covering film 20.

[0040] In other embodiments, a suture 60 is spirally wound around each connecting rod 425 of the end annular support frame 42. Specifically, one end of the suture 60 is fixed to the end of the connecting rod 425 that is higher than the proximal end surface 23 of the coating 20 by tying a knot, and the other end of the suture 60 is spirally wound around the connecting rod 425 as a path to the end of the connecting rod 425 that is lower than the proximal end surface 23 of the coating 20, and is fixed by tying a knot. The suture 60 sutures the coating 20 on the suture path with the end annular support frame 42.

[0041] like Figure 2 As shown, a developing member 70 is provided at the proximal end and / or the distal end of the covering film 20, and the developing member 70 is made of a developing material. The developing member 70 may be a plurality of developing points arranged continuously or discontinuously along the opening edge of the proximal end and / or the distal end of the covering film 20, and these developing points may be fixed on the covering film 20 by suturing, stamping, inlaying or pasting; since the developing member 70 has developing properties and is annular, the position of the developing member 70 can be clearly observed by imaging equipment during the operation, which facilitates the implantation of the vascular stent 100.

[0042] In other embodiments, the developing member 50 may also be a developing wire that is continuously or discontinuously wound around the proximal and / or distal edges of the coating 20 , and the developing wire may be a nickel-titanium alloy wire containing tantalum.

[0043] In other embodiments, the suture 60 spirally wound on the end ring support frame 42 can be replaced by a developing wire containing developing material, and the developing wire is preferably made of a nickel-titanium alloy wire containing tantalum.

[0044] In other embodiments, an opening is formed on the outer peripheral wall of the coating 20 , and the opening is extended into the cavity of the main support frame 40 and is provided with an embedded branch.

[0045] Please also read Figure 4 and Figure 5 , Figure 4 is a schematic structural diagram of a vascular stent provided by a second embodiment of the present invention; Figure 5 yes Figure 4 The structure of the vascular stent provided in the second embodiment of the present invention is similar to that of the first embodiment, except that: in the second embodiment, a plurality of positioning members 422 are further provided on the end annular support frame 42a, and the suture 60 is spirally wound around the end annular support frame 42a and sutured to the coating 20, and the suture 60 is fixed on these positioning members 422, and the positioning members 422 can prevent the suture 60 from sliding on the end annular support frame 42a.

[0046] Specifically, the end annular support frame 42a is cut and processed by elastic metal, preferably superelastic nickel-titanium metal. The structure of the end annular support frame 42a is similar to the structure of the end annular support frame 42 in the first embodiment, that is, the end annular support frame 42a can be an equal wave support rod or a high-low wave support rod, etc. Each Z-shaped or sinusoidal waveform of the end annular support frame 42a includes a trough 421, a crest 423 and a connecting rod 425 connected between the crest 423 and the trough 421. A connecting hole 4212 is provided on each trough 421, and the suture is wrapped around the connecting hole 4212 to sew the trough 421 to the coating 20.

[0047] The position of the positioning member 422 is higher than the proximal end surface 23 of the end annular support frame 42a. Specifically, the positioning member 422 is a flange provided on the connecting rod 425 of the end annular support frame 422. The suture 60 is spirally wound along the end annular support frame 42a and extends over the flange and is fixed on the flange. Specifically, the flange is provided at one end of the connecting rod 425 higher than the proximal end surface of the coating 20, that is, the connecting rod 425 is partially protruded at a position higher than the end surface of the coating 20, thereby forming the flange, and the outer diameter of the flange is greater than the outer diameter of the connecting rod 425.

[0048] In this embodiment, each connecting rod 425 of the end annular support frame 42a is provided with a flange protruding from a position higher than the proximal end surface 23 of the coating 20. These flanges are parallel in the axial direction of the end annular support frame 42a, that is, these flanges are located on the same plane. A suture 60 is spirally wound between each trough 421 and the corresponding two connecting rods 425, that is, one end of the suture 60 is tied at the end of the flange of one of the connecting rods 425 away from the coating 20 to obtain a knot 62. Since the outer diameter of the flange is large, the knot 62 cannot slide along the outer circumferential surface of the flange toward the coating 20, thereby fixing the height of the knot 62, so that one end of the suture 60 is fixed to the upper end of the corresponding flange by the knot 62; then the other end of the suture 60 is spirally wound along one of the connecting rods 425 toward the trough 421, passing through the trough 421 and the corresponding other connecting rod 425, and at the end of the flange of the other connecting rod 425 facing away from the coating 20, the suture is tightened and then tied to obtain another knot 62. The suture thread 60 is spirally wound along the end annular support frame 42 a while tightly sews the membrane 20 along the way to the end annular support frame 42 a so as to fix the membrane 20 on the end annular support frame 42 a.

[0049] Since the suture 60 is tightened during the process of spirally winding on the end annular support frame 42a, its tensile stress can act on the coating 20, so that the position of the coating 20 can be stably fixed, and since the knots 62 at both ends of each suture 60 are blocked by the corresponding flanges and cannot slide toward the coating 20 along the connecting rod 425, the suture as a whole will not slide down along the end annular support frame 42a, thereby maintaining the tensile stress of the suture 60, which can effectively prevent the end surface of the coating 20 from sliding or wrinkling relative to the end annular support frame 42a during the release of the vascular stent 100a.

[0050] In this embodiment, a branch vessel stent 44 is also provided on the main support frame 40, and the diameter of the branch vessel stent 44 is smaller than the diameter of the main support frame 40. The branch vessel stent 44 is provided at the distal end of the main support frame 40, and the branch vessel stent 44 includes a tubular branch coating 442 and a plurality of Z-shaped or sinusoidal annular corrugated support rods 444 provided on the branch coating 442, and these annular corrugated support rods 444 are arranged at intervals along the axial direction of the branch vessel stent 44, and each of the annular corrugated support rods 444 is sutured to the branch coating 442 by sutures. The structures of the branch coating 442 and the annular corrugated support rods 444 are respectively similar to the coating 20 and the annular corrugated support rods 41 in the first embodiment, and only the sizes are different, which will not be repeated here. In this embodiment, two branch vessel stents 44 are provided at the distal end of the main support frame 40.

[0051] In other embodiments, each connecting rod 425 is provided with a suture 60 between the corresponding trough 421 and the positioning member 422. Specifically, one end of the suture 60 is tied at the end of the flange of the connecting rod 425 away from the coating 20 to obtain a knot 62. Since the outer diameter of the flange 422 is relatively large, the knot cannot slide along the outer peripheral surface of the flange 422 toward the coating 20, thereby fixing the height of the knot 62, so that one end of the suture 60 is fixed by the knot 62 above the corresponding flange 422; then the other end of the suture 60 is spirally wound along the connecting rod 425 toward the trough 421, the suture is tightened when adjacent to the trough 421, and a knot is tied on the outer peripheral wall of the connecting hole 4212 to obtain a knot. While the suture 60 is spirally wound along the end connecting rod 425, the coating 20 along the way is tightly sewed to the connecting rod 425.

[0052] See also Figure 6 , Figure 6: is a schematic diagram of the structure of the vascular stent provided by the third embodiment of the present invention. The structure of the vascular stent provided by the third embodiment of the present invention is similar to that of the second embodiment, except that: in the third embodiment, the positioning members 422 on the two adjacent connecting rods 425 on the end annular support frame 42b are staggered in the axial direction of the end annular support frame 42a. Specifically, the positioning members 422 on the two connecting rods 425 of each Z-shaped or sinusoidal waveform of the end annular support frame 42b are staggered in the axial direction of the end annular support frame 42b, that is, one of the positioning members 422 is adjacent to the coating 20, and the other positioning member 422 is away from the coating 20. In this embodiment, the positioning members 422 on the two connecting rods 425 of each Z-shaped or sinusoidal waveform are staggered in the axial direction of the end annular support frame 42b, which can reduce the maximum radial cross-sectional area of ​​the end annular support frame 42b after compression, so that the end annular support frame 42b can be suitable for a smaller sheath tube and is easier to load into the conveyor.

[0053] Please also read Figure 7 and Figure 8 , Figure 7 is a schematic structural diagram of a vascular stent provided by a fourth embodiment of the present invention; Figure 8 yes Figure 7 A partial enlarged view of the vascular stent in the fourth embodiment of the present invention. The structure of the vascular stent provided in the fourth embodiment of the present invention is similar to that of the first embodiment, except that: in the fourth embodiment, a plurality of positioning members are further provided on the end annular support frame 42c, and the positioning members are a plurality of steel sleeves 65 provided on the end annular support frame 42c, and the suture 60 is spirally wound and extended along the end annular support frame 42c and sutures the coating 20, and the suture 60 is fixed on the steel sleeve 65. The end annular support frame 42c is a high-low wave support rod of a Z-shaped or sinusoidal waveform, and the steel sleeve 65 is provided on the high wave 420 of the high-low wave support rod. The high wave 420 refers to a wave crest that is higher than other wave crests of the end annular support frame 42c. The steel sleeve 65 is clamped on the high wave 420 of the end annular support frame 42c by means of compression or the like, or the steel sleeve 65 is integrally formed with the end annular support frame 42c. The outer diameter of each steel sleeve 65 is larger than the wire diameter of the screw rod of the end annular support frame 42c.

[0054] Specifically, the end annular support frame 42c is woven by elastic metal wires, preferably nickel-titanium wires with superelasticity. There are at least two high waves 420 in the end annular support frame 42c, and the at least two high waves 420 are evenly spaced along the circumference of the end annular support frame 42c, that is, at least two high waves 420 are rotated in an array along the axis of the end annular support frame 42c. Each high wave 420 includes a crest 423, two troughs 421, and two connecting rods 425 respectively connected between the crest 423 and the two troughs 421. The end annular support frame 42c can be connected to the coating 20 by sutures.

[0055] In this embodiment, the end annular support frame 42c includes three high waves 420, and the three high waves 420 are evenly spaced along the circumference of the end annular support frame 42c. A pair of steel sleeves 65 are respectively arranged on the two connecting rods 425 of each high wave 420, and the pair of steel sleeves 65 are respectively arranged on the upper and lower sides of the intersection of the end annular support frame 42c and the coating 20, that is, the position of one steel sleeve 65 is higher than the proximal end surface 23 of the coating 20, and the position of the other steel sleeve 65 is lower than the proximal end surface 23 of the coating 20. The two pairs of steel sleeves 65 on each high wave 420 are parallel in the axial direction of the end annular support frame 42c, that is, the steel sleeves 65 higher than the proximal end surface 23 are located in the same plane in the axial direction of the end annular support frame 42c, and the steel sleeves 65 lower than the proximal end surface 23 are located in the same plane in the axial direction of the end annular support frame 42c. The suture thread 60 is spirally wound along the path of the connecting rod 425 of each high wave 420 of the end annular support frame 42c and sews the coating 20 along the way. The suture thread 60 is fixed between the pair of steel sleeves 65 by tying a knot.

[0056] Specifically, one end of the suture 60 is tied to form a knot 62 at the end of the steel sleeve 65 of one of the connecting rods 425 of each high wave 420 that is higher than the proximal end surface 23 of the coating 20 and away from the coating 20. Since the outer diameter of the steel sleeve 65 is large, the knot 62 cannot slide along the outer circumference of the steel sleeve 65 toward the coating 20, thereby fixing the height of the knot 62, so that one end of the suture 60 is fixed to the upper end of the corresponding steel sleeve 65 by the knot 62; then the other end of the suture 60 is spirally wound along one of the connecting rods 425 toward the trough 421, passes through another steel sleeve 65, and is tightened at the end of the other steel sleeve 65 facing away from the wave crest 423, and then knotted to form another knot 62. While the suture 60 is spirally wound along the end annular support frame 42c, the coating 20 along the way is tightly sutured to the end annular support frame 42c, so as to fix the coating 20 on the end annular support frame 42c. Since the suture 60 is tightened, its tensile stress can act on the coating 20, thereby fixing the position of the coating 20. Since the two knots 62 are respectively blocked by the two steel sleeves 65 and cannot slide along the connecting rod 425, the two ends of the suture 60 are fixed, so that the suture 60 as a whole will not slide along the end annular support frame 42c, and the tensile stress of the suture 60 can be maintained.

[0057] In this embodiment, the coating 20 includes a straight tube section 22 and a tapered section 24, wherein the tapered section 24 is axially arranged at the distal end of the straight tube section 22. The proximal end of the straight tube section 22 is provided with the end annular support frame 42c, and the high wave 420 of the end annular support frame 42c is higher than the proximal end surface 23 of the coating 20; the straight tube section 22 is provided with a plurality of Z-shaped or sinusoidal annular corrugated support rods 41, and the plurality of annular corrugated support rods 41 are arranged at intervals along the axial direction of the coating 20. The diameter of the tapered section 24 decreases from the proximal end to the distal end, and the tapered section 24 is provided with a plurality of Z-shaped or sinusoidal annular corrugated support rods 45, and the diameters of these annular corrugated support rods 45 decrease from the proximal end to the distal end of the tapered section 24, and the annular corrugated support rods 45 are high-low wave support rods.

[0058] In other embodiments, the end annular support frame 42c is provided with more than three high waves 420, and these high waves 420 can be rotated in an array along the axis of the end annular support frame 42c. A pair of steel sleeves 65 are respectively arranged at intervals on the two connecting rods 425 of each high wave 420, and each steel sleeve 65 can be made of developing material to facilitate the implantation of the vascular stent 100.

[0059] Please also read Fig. 9 and Fig.10 , Fig. 9 is a schematic structural diagram of a vascular stent provided in a fifth embodiment of the present invention; Fig.10 yes Fig. 9A partial enlarged view of the vascular stent in the fifth embodiment of the present invention. The structure of the vascular stent provided in the fifth embodiment of the present invention is similar to that of the fourth embodiment, except that: in the fifth embodiment, the two pairs of steel sleeves 65 on the two connecting rods 425 of each high wave 420 on the end annular support frame 42c are staggered in the axial direction of the end annular support frame 42c, that is, one of the pairs of steel sleeves 65 is located between the other pair of steel sleeves 65. In this embodiment, the two pairs of steel sleeves 65 on the two connecting rods 425 of each high wave 420 are staggered in the axial direction of the end annular support frame 42c, which can reduce the maximum radial cross-sectional area of ​​the end annular support frame 42c after compression, so that the end annular support frame 42c can be suitable for a smaller sheath tube and is easier to load into the conveyor.

[0060] In this embodiment, the coating 20 is a variable diameter truncated cone structure, which includes a proximal straight tube section 25, a distal straight tube section 26 and a transition section 27 connected between the proximal straight tube section 25 and the distal straight tube section 26, and the axial length of the transition section 27 is 5-50 mm. The proximal end of the proximal straight tube section 25 is provided with the end annular support frame 42c, and the high wave 420 of the end annular support frame 42c is higher than the proximal surface 23 of the coating 20. The diameter of the coating 20 at the transition section 27 is smaller than the diameters at the proximal straight tube section 25 and the distal straight tube section 26. The coating 20 at the proximal straight tube section 25 is provided with a plurality of Z-shaped or sinusoidal annular corrugated support rods 41, and the plurality of annular corrugated support rods 41 are arranged at intervals along the axial direction of the coating 20, and each annular corrugated support rod 41 is an equi-wave support rod. The membrane 20 at the distal straight tube section 26 is provided with a plurality of Z-shaped or sinusoidal annular corrugated support rods 412, which are arranged at intervals along the axial direction of the membrane 20, and each annular corrugated support rod 412 is a high-low wave support rod. The membrane 20 at the transition section 27 is provided with a Z-shaped or sinusoidal annular corrugated support rod 414 located in the middle, and two conical corrugated support rods 416 located at the proximal and distal ends of the transition section 27, respectively, and the diameter of the annular corrugated support rod 414 is smaller than the diameters of the annular corrugated support rods 41 and 412.

[0061] See also Fig.11 , Fig.11 : is a schematic diagram of the structure of the vascular stent provided by the sixth embodiment of the present invention. The structure of the vascular stent provided by the sixth embodiment of the present invention is similar to that of the fourth embodiment, except that: in the sixth embodiment, two connecting rods 425 of each high wave 420 on the end annular support frame 42c are respectively provided with a steel sleeve 65, that is, each connecting rod 425 is provided with a steel sleeve 65 at a position higher than the proximal end surface 23 of the coating 20, and the steel sleeve at a position lower than the proximal end surface 23 of the coating 20 is omitted.

[0062] In this embodiment, one end of the suture 60 is tied at the end of the steel sleeve 65 of one of the connecting rods 425 of each high wave 420 away from the coating 20 to obtain a knot 62. Since the outer diameter of the steel sleeve 65 is large, the knot 62 cannot slide along the outer circumference of the steel sleeve 65 toward the coating 20, thereby fixing the height of the knot 62, so that one end of the suture 60 is fixed to the upper end of the corresponding steel sleeve 65 by the knot 62; then the other end of the suture 60 is spirally wound along one of the connecting rods 425 toward the trough 421, and when it is adjacent to the corresponding trough 421, the suture 60 is tightened and knotted to obtain another knot 62. While the suture 60 is spirally wound along the connecting rod 425 of the end annular support frame 42c, the coating 20 along the way is tightly sutured to the end annular support frame 42c, so as to fix the coating 20 on the end annular support frame 42c. Since the suture 60 is tightened, its tensile stress can act on the coating 20, thereby fixing the position of the coating 20. Since one end of the knot 62 is fixed to the steel sleeve 65 and the other end is fixed to the coating 20, the knot 62 cannot slide along the connecting rod 425, so that the suture 60 as a whole will not slide along the end annular support frame 42c, and the tensile stress of the suture 60 can be maintained.

[0063] In this embodiment, a steel sleeve 65 is omitted from each connecting rod 425 of each high wave 420, which saves the manufacturing cost of the vascular stent while maintaining the same effect of positioning the coating 20.

[0064] The steel sleeves 65 on the two connecting rods 425 of the same high wave 420 can be parallel or staggered in the axial direction of the end ring-shaped support frame 42c. When the two steel sleeves 65 on the same high wave 420 are staggered in the axial direction of the end ring-shaped support frame 42c, the maximum radial cross-sectional area of ​​the end ring-shaped support frame 42c after compression can be reduced, so that the end ring-shaped support frame 42c can be applied to a smaller sheath tube and can be more easily loaded into the conveyor.

[0065] See also Fig.12 , Fig.12 : is a schematic diagram of the structure of the vascular stent provided by the seventh embodiment of the present invention. The structure of the vascular stent provided by the seventh embodiment of the present invention is similar to that of the first embodiment, except that: in the seventh embodiment, the anti-slip component is a medical glue 66 disposed between the end annular support frame 42 and the coating 20, so that the coating 20 can be fixed to the end annular support frame 42. Specifically, the connecting rod 425 of the end annular support frame 42 lower than the proximal surface 23 is fixed to the coating 20 by the medical glue 66. In this embodiment, the end annular support frame 42 is attached to the coating 20 by the medical glue 66 to prevent the coating 20 from slipping and wrinkling.

[0066] See also Fig.13 , Fig.13: is a schematic diagram of the structure of the vascular stent provided by the eighth embodiment of the present invention. The structure of the vascular stent provided by the eighth embodiment of the present invention is similar to that of the first embodiment, except that: in the eighth embodiment, a plurality of positioning members are further provided on the end annular support frame 42, and the positioning members are locking grooves 428 provided on the end annular support frame 42, and the position of the locking grooves 428 is higher than the proximal surface of the coating 20. The suture 60 is spirally wound along the path of the end annular support frame 42 and sutures the coating 20 along the way, and the end of the suture 60 is fixed in the locking groove 428.

[0067] Specifically, a line groove 428 is provided on the connecting rod 425 of the end annular support frame 42, which is higher than the proximal end surface 23. One end of the suture 60 is fixed by tying a knot in the line groove 428 of one of the connecting rods 425. Since one end of the suture 60 is connected and fixed in the line groove 428, the knot is not easy to escape from the line groove 428, thereby fixing the height of the knot at one end of the suture 60, so that one end of the suture 60 is fixed to the corresponding line groove by the knot. 428; then the other end of the suture 60 is spirally wound along the connecting rod 425 toward the corresponding trough 421, extended to the other connecting rod 425 through the trough 421, the suture is tightened when adjacent to the wiring groove 428 on the other connecting rod 425, and a knot is tied in the wiring groove 428 on the other connecting rod 425 to obtain a knot, and the suture 60 is spirally wound along the end connecting rod 425 while tightly sews the coating 20 along the way to the connecting rod 425.

[0068] The above is an implementation of the embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the embodiment of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A vascular stent for preventing a coating from slipping off, comprising a coating and a main support frame arranged on the coating, wherein the main support frame comprises an end ring support frame partially exposing the coating, characterized in that: The vascular stent also includes an anti-slip component, which is arranged between the end annular support frame and the coating, and is used to fix the coating to the vascular stent to prevent the coating from slipping and wrinkling, wherein the anti-slip component is at least a suture thread sutured between the end annular support frame and the coating, and the suture thread can sew the coating and fix it on the end annular support frame, and the suture thread is spirally wound along the end annular support frame as a path and sews the coating along the way, wherein the suture thread is spirally wound around part or all of the proximal surface of the end annular support frame that is higher than the coating, and one end of the suture thread is fixed to one end of the end annular support frame that is higher than the proximal surface of the coating, wherein the proximal end and / or distal end of the coating is provided with a developing component.

2. The vascular stent according to claim 1, characterized in that: A plurality of positioning pieces are arranged on the end annular support frame, and the suture is wound along the end annular support frame and fixed on these positioning pieces, and the positioning pieces can prevent the suture from sliding on the end annular support frame.

3. The vascular stent according to claim 2, characterized in that: The position of the positioning piece is higher than the proximal end surface of the end annular support frame, and one end of the suture thread is fixed on the positioning piece.

4. The vascular stent according to claim 3, characterized in that: The positioning piece is a flange arranged on the connecting rod of the end annular support frame, the suture thread is wound along the end annular support frame and extends over the flange, and is fixed to the end of the flange away from the covering film.

5. The vascular stent according to claim 4, characterized in that: The suture thread is fixed by tying a knot at the end of the flange away from the covering membrane.

6. The vascular stent according to claim 4, characterized in that: The flanges are arranged in parallel or staggered in the axial direction of the end annular support frame.

7. The vascular stent according to claim 3, characterized in that: The positioning piece is a steel sleeve arranged on the end ring-shaped support frame, and the suture line is wound and extended along the end ring-shaped support frame and fixed on the steel sleeve.

8. The vascular stent according to claim 3, characterized in that: The positioning piece is a pair of steel sleeves arranged on the same connecting rod of the end annular support frame, one of the pair of steel sleeves is positioned higher than the proximal surface of the coating, and the other is positioned lower than the proximal surface of the coating, the suture thread is spirally wound along the path of the end annular support frame and sews the coating along the way, and the suture thread is fixed between the pair of steel sleeves.

9. The vascular stent according to claim 8, characterized in that: Two adjacent pairs of steel sleeves are arranged in parallel or staggered in the axial direction of the end annular support frame.

10. The vascular stent according to claim 2, characterized in that: The end annular support frame has at least two high waves with wave crests higher than other wave crests, and at least two of the high waves are evenly or unevenly spaced along the circumference of the end annular support frame, and the positioning piece is arranged on each high wave.

11. The vascular stent according to claim 3, characterized in that: The positioning piece is a locking groove arranged on the end annular support frame. The locking groove is a recessed groove on the end annular support frame, and its position is higher than the proximal surface of the end annular support frame. The suture thread is spirally wound along the path of the end annular support frame and sutured with a film along the way, and the end of the suture thread is fixed in the locking groove.

12. The vascular stent according to claim 1, characterized in that: The developing member is a developing wire that is continuously or discontinuously wound around the edge of the proximal end and / or the distal end of the coating; or the developing member is a developing point that is inlaid or attached to the proximal end and / or the distal end of the coating.

13. The vascular stent according to claim 1, characterized in that: The coating includes a straight tube section and a tapered section, wherein the tapered section is axially arranged at the distal end of the straight tube section, and the end annular support frame is arranged at the proximal end of the straight tube section, and the diameter of the tapered section decreases from the proximal end to the distal end.

14. The vascular stent according to claim 1, characterized in that: An opening is provided on the outer peripheral wall of the coating, and an embedded branch is provided in the opening extending into the cavity of the main support frame.

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