CN210811782U

CN210811782U - Blood vessel support

Info

Publication number: CN210811782U
Application number: CN201921153680.5U
Authority: CN
Inventors: 朱悦琦; 李峥; 刘享承; 赵中
Original assignee: Zhuhai Tongqiao Medical Technology Co ltd
Current assignee: Zhuhai Tongqiao Medical Technology Co ltd
Priority date: 2019-07-22
Filing date: 2019-07-22
Publication date: 2020-06-23
Anticipated expiration: 2029-07-22

Abstract

The utility model provides a blood vessel support, including the support near-end that connects gradually, support main part and support distal end, wherein the support main part comprises the open supporting element of multirow and the open flexible unit alternate arrangement of multirow, each row is opened the supporting element and each row is opened the equal end to end connection of flexible unit and is as an organic whole, open supporting element is formed by connecting positive ripple brace rod and anti ripple brace rod, open flexible unit is formed by connecting positive ripple flexible muscle and anti ripple flexible muscle, the open supporting element of predetermined quantity and the adjacent open flexible unit of predetermined quantity of axial connect and form a compound closed ring. Two axially adjacent composite closed rings are connected through a connecting rib. The strength of the open supporting unit is greater than that of the open flexible unit, and the deformation capacity of the open supporting unit is smaller than that of the open flexible unit. The blood vessel stent has more moderate radial supporting force and anchoring force, and reduces excessive compression on a narrow plaque; meanwhile, the adhesive has better flexibility and fitting property, and poor adherence is avoided.

Description

Blood vessel support

Technical Field

The utility model relates to the field of medical equipment, especially, relate to a vascular stent, vascular stent can implant intracranial vascular treatment such as the disease that the intracranial artery stenosis of symptomatic arouses etc..

Background

Intracranial atherosclerotic stenosis is a significant cause of ischemic stroke and is preferred in non-caucasian races such as asian, african and hispanic. The drug treatment of intracranial arterial stenosis mainly comprises anticoagulation, anti-platelet aggregation and acute phase thrombolysis. Anti-platelet aggregation and anticoagulation are classical treatments for symptomatic intracranial arterial stenosis, but the rate of stroke recurrence remains high. The traditional operation treatment is mainly limited to common carotid artery or extracranial segment of internal carotid artery, and the main operation modes include carotid intimal denudation, external carotid artery-internal carotid artery bypass surgery and the like.

With advances in instrumentation technology and increased experience of neurointerventionalists, the risk of intravascular treatment has been greatly reduced and stenting has become one of the important treatments for symptomatic intracranial arteriosclerotic stenosis. Compared with the extracranial artery, the intracranial artery has the particularity of its structural form: firstly, the running of intracranial arteries is tortuous, especially in blood vessels with severe atherosclerosis; the intracranial arterial blood vessel wall is thin and lacks elasticity; thirdly, the blood vessel is positioned in cerebrospinal fluid of the subarachnoid space, and no tissue surrounds and supports the blood vessel; and fourthly, the intracranial arteries emit a plurality of branch-penetrating arteries to supply deep brain parenchyma and are mostly terminal arteries, and collateral circulation is incomplete.

The current intracranial stents used to treat intracranial atherosclerotic stenosis are at a higher risk of developing complications. The main reasons are: firstly, current intracranial support radial bracing force is too big, and the support forms the snow plough effect to the extrusion of stenosis plaque, makes the plaque piece block up the branch blood vessel and leads to the infarction to take place, and secondly the compliance is relatively poor and chronic flaring tension is less, leads to the adherence poor, easy restenosis.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a blood vessel support, which solves the problem that the radial supporting force of the existing blood vessel support is too large and is easy to press narrow plaque, so that plaque fragments block branch blood vessels to cause infarction; and solves the problems of poor compliance and poor adherence and restenosis caused by small chronic external expansion tension of the existing vascular stent.

In order to solve the above problem, the utility model provides a vascular stent, vascular stent includes support distal end, support near-end and support main part. The far end of the bracket is formed by connecting a plurality of rows of closed-loop grids, and one end of the far end of the bracket is provided with an outward-expanding horn mouth. The stent main body is integrally connected between the distal end of the stent and the proximal end of the stent, so that the whole vascular stent forms a tubular shape, the stent main body is formed by alternately arranging a plurality of rows of open supporting units and a plurality of rows of open flexible units, each row of open supporting units and each row of open flexible units are connected into a whole end to end, each open supporting unit is formed by connecting positive corrugated supporting ribs and negative corrugated supporting ribs, each open flexible unit is formed by connecting positive corrugated flexible ribs and negative corrugated flexible ribs, and a predetermined number of open supporting units and a predetermined number of axially adjacent open flexible units are connected through two first connecting points to form a composite closed ring. The stent main body further comprises a connecting rib, and two composite closed rings which are adjacent along the axial direction of the intravascular stent are connected through the connecting rib. The rib widths of the positive corrugated supporting rib and the negative corrugated supporting rib are larger than the positive corrugated flexible rib and the negative corrugated flexible rib, so that the strength of the open supporting unit is larger than that of the open flexible unit, and the deformation capacity of the open flexible unit is larger than that of the open supporting unit. The included angle formed by the positive corrugated supporting rib and the negative corrugated supporting rib of the same open supporting unit is larger than the included angle formed by the positive corrugated flexible rib and the negative corrugated flexible rib of the same open flexible unit.

According to an embodiment of the present invention, the composite closed ring is a closed ring formed by connecting two open supporting units and three open flexible units, the two open supporting units are sequentially and respectively marked as a first open supporting unit and a second open supporting unit, the three open flexible units are sequentially and respectively marked as a first open flexible unit, a second open flexible unit and a third open flexible unit, respective positive corrugated supporting ribs and reverse corrugated supporting ribs of the first open supporting unit and the second open supporting unit are all connected through a second connection point, and the positive corrugated flexible ribs and the reverse corrugated flexible ribs of the second open flexible unit are connected through a third connection point; the connecting rib is connected with the second connecting point of the first open supporting unit of one of the composite closed rings and the third connecting point of the second flexible unit of the axially adjacent composite closed ring, or the connecting rib is connected with the second connecting point of the second open supporting unit of one of the composite closed rings and the third connecting point of the second flexible unit of the axially adjacent composite closed ring.

According to the utility model discloses an embodiment, compound closed ring is the closed ring that is formed by three open supporting element and four open flexible unit connections, three open supporting element is marked as first open supporting element respectively in proper order, open supporting element of second and the third open supporting element, four open flexible unit are marked as first open flexible unit respectively in proper order, open flexible unit of second, open flexible unit of third and the fourth open flexible unit, wherein the positive ripple brace rod and the reverse ripple brace rod of second open supporting element are connected through the second tie point, the respective positive ripple flexible muscle and the respective reverse ripple flexible muscle of second open flexible unit and open flexible supporting element are all connected through the third tie point; the connecting rib is connected with the second connecting point of the second open supporting unit of one of the composite closed rings and the third connecting point of the second flexible supporting unit of the axially adjacent composite closed ring, or the connecting rib is connected with the second connecting point of the second open supporting unit of one of the composite closed rings and the third connecting point of the third open flexible unit of the axially adjacent composite closed ring.

According to an embodiment of the present invention, the composite closed loop is a closed loop formed by connecting three open supporting units and five open flexible units, the three open supporting units are sequentially and respectively denoted as a first open supporting unit, a second open supporting unit and a third open supporting unit, the five open flexible units are sequentially and respectively denoted as a first open flexible unit and a second open flexible unit, the flexible unit comprises a third opening flexible unit, a fourth opening flexible unit and a fifth opening flexible unit, wherein a positive corrugated supporting rib and a negative corrugated supporting rib of the second opening flexible unit are connected through a second connection point, the positive corrugated flexible rib and the negative corrugated flexible rib of the third opening flexible unit are connected through a third connection point, and the connection rib is connected with the second connection point of the second opening supporting unit of one composite closed ring and the third connection point of the third opening flexible unit of the axially adjacent composite closed ring.

According to an embodiment of the present invention, the connecting rib is one of a straight line shape, an omega shape or an S shape.

According to the utility model discloses an embodiment, open supporting element's positive ripple brace rod and anti ripple brace rod have the same muscle width W1, and open flexible unit's positive ripple flexible muscle and the flexible muscle of anti ripple have the same muscle width W2, and the muscle width W1 is 1.2 times to 2.5 times of muscle width W2. The side wall of the far end of the bracket at the bell mouth position and the central axis of the blood vessel bracket form an included angle of 10 degrees to 30 degrees.

According to the utility model discloses an embodiment, the support near-end is formed by multirow closed loop grid connection, the one end of support near-end has the horn mouth that expands outward.

According to the utility model discloses an embodiment, the support near-end includes bevel connection reticulation district section, connecting rod, one row at least closed loop net and development cover, the closed loop net joint of support near-end is in the support main part, bevel connection reticulation district section joint is in the closed loop net of support near-end, bevel connection reticulation district section forms towards whole the funnel-shaped of intravascular stent one side lateral wall slope and forms a pointed end tie point at self end, the connecting rod is connected in pointed end tie point, the end of connecting rod has the round hole, the round hole of connecting rod is used for entangling the connecting ball of conveying silk one end, the development cover overlaps at the round hole position of connecting rod, the intravascular stent includes a plurality of development rings, wherein a part of development ring sets up in the connecting rib, and another part of development ring sets up in the horn mouth position of; after the vascular stent is completely released, the vascular stent is separated from the delivery wire in an electrolytic stripping mode.

According to an embodiment of the present invention, the material of the blood vessel stent is one of nickel-titanium alloy, cobalt-base alloy or stainless steel, and the material of the developing ring is one of platinum-tungsten alloy, platinum-iridium alloy or pure tantalum.

According to the utility model discloses an embodiment, the contained angle scope that positive ripple brace rod and the reverse ripple brace rod of same open supporting element formed is 45 ~ 90, and the contained angle scope that positive ripple flexible muscle and the reverse ripple flexible muscle of same open flexible unit formed is 30 ~ 70.

According to the utility model discloses an embodiment, in the circumferencial direction of blood vessel support preset position, the ratio X of the quantity of compound closed ring and the diameter numerical value of blood vessel support is 0.5 ~ 2, and wherein the diameter numerical value of blood vessel support uses the millimeter to calculate as the unit.

According to an embodiment of the present invention, in the circumferential direction of the predetermined position of the blood vessel stent, the ratio X between the number of the composite closed rings and the diameter value of the blood vessel stent is 1.

Compared with the prior art, the technical scheme has the following advantages:

the utility model discloses a form the support main part of the fretwork cylindrical shape body shape of in proper order alternate arrangement and connection by the open supporting element of multirow and the open flexible unit of multirow respectively to open supporting element's intensity is greater than open flexible unit, and open flexible unit's deformability is greater than open supporting element, and open supporting element is more rigid in order to provide radial holding power, and open flexible unit is softer in order to keep good compliance and laminating nature. The unique design ensures that the blood vessel stent obtains more moderate radial supporting force and better anchoring force through the open supporting unit, can reduce excessive extrusion on the stenotic plaque, and avoids the plaque from being broken to cause fragments to block the branch blood vessel; make simultaneously vascular support obtains better compliance and laminating nature through opening flexible unit, improves the effect of vascular support scaffold, avoids vascular support and vascular wall in crooked blood vessel exist the clearance, reduces the probability that restenosis takes place.

Drawings

Fig. 1 is a schematic structural view of a first embodiment of a vascular stent provided by the present invention;

fig. 2 is a schematic structural view of the vascular stent of the first embodiment of the present invention in a state where the stent is virtually spread out flatly;

FIG. 3 is an enlarged partial view of a first embodiment of a stent provided in the present invention, showing the structure of the open support elements and the structure of the open flexible elements;

fig. 4 is a partial enlarged view of the vascular stent of the first embodiment of the present invention, showing the structure of the open supporting unit, the structure of the open flexible unit, one structure of the connecting ribs and the interconnection manner between the three;

fig. 5 is a partially enlarged view of the proximal end of the stent of the first embodiment of the vascular stent provided in the present invention;

FIG. 6 shows a modified structure of the connecting rib of the vascular stent;

FIG. 7 shows another modified structure of the connecting rib of the vascular stent;

fig. 8 is a partial enlarged view of a second embodiment of a vascular stent provided in the present invention;

fig. 9 is a partially enlarged view of a third embodiment of a vascular stent provided in the present invention;

fig. 10 is a schematic structural view of a fourth embodiment of the vascular stent provided by the present invention;

fig. 11 is a schematic structural view of a fourth embodiment of the stent according to the present invention in a state where the stent is virtually spread out in a flat manner.

The flexible connection structure comprises a flexible connection unit 10, a stent far end, 11, a closed loop mesh, 101, a horn opening, 111, a positive corrugated support unit 112, a negative corrugated support unit, α, an included angle, L1, the length of the stent far end, 20, a stent main body, 21, an open support unit, 211, a positive corrugated support rib, 212, a reverse corrugated support rib, 213, a second connection point, 214, a second connection point, W1, the rib width of the positive corrugated support rib and the reverse corrugated support rib, 22, an open flexible unit, 221, a positive corrugated flexible rib, 222, a reverse corrugated flexible rib, 223, a third connection point, W2, the rib width of the positive corrugated flexible rib and the reverse corrugated flexible rib, 23, a first connection point, 24, a connection rib, L2, the length of the stent main body, 30, the stent far end, 31, the closed loop mesh, 32, a diagonal section, 33, a connection rod, 3301, a round hole 34, a developing sleeve, L3, the length of the stent, 40, a composite stent closed loop support unit, 101, a loop support unit, a support unit, a connection point, a connection unit, a connection point, a connection unit, a connection point, a connection unit, a.

Detailed Description

The following description is only intended to disclose the invention so as to enable any person skilled in the art to practice the invention. The embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art. The principles of the invention, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents, and other arrangements without departing from the spirit and scope of the invention.

As shown in fig. 1 to 5, the present invention provides a vascular stent, in particular to a vascular stent for intracranial vascular treatment. For example, the vascular stent can treat vascular diseases such as symptomatic intracranial arterial stenosis. The stent includes a stent distal end 10, a stent body 20, and a stent proximal end 30. The blood vessel support is formed by carving a metal pipe, and a plurality of hollow grids are formed on the pipe wall of the metal pipe. The stent distal end 10, the stent main body 20 and the stent proximal end 30 are sequentially and integrally distributed along the axial direction of the metal tube, and a channel is formed inside the whole blood vessel stent. The stent proximal end 30 is the end that is proximal to the delivery wire (i.e., proximal to the operating end) when delivered into the vessel, and also corresponds to the proximal end of the vessel; conversely, the distal end 10 of the stent is the end that is distal to the delivery wire (i.e., distal to the operative end) when delivered into the blood vessel, and corresponds to the distal end of the blood vessel.

As shown in FIG. 1, the stent distal end 10 is formed by connecting a plurality of rows (e.g., 2-5 rows) of closed-loop meshes 11, one end of the stent distal end 10 has an outward flared bell 101, and the other end of the stent distal end 10 is integrally connected with the stent main body 20. the diameters of different positions of the stent distal end 10 are different, and the diameters of the positions closer to the bell 101 of the stent distal end 10 are larger and the diameters of the positions closer to the stent main body 20 are smaller.

The stent body 20 is integrally connected between the stent distal end 10 and the stent proximal end 30 such that the entire vascular stent is formed in a tubular shape. The stent body 20 is a portion that mainly supports the position of stenosis of a blood vessel after the vascular stent is implanted in the blood vessel. The support main body 20 is a hollow cylindrical body and is formed by alternately arranging a plurality of rows of open supporting units 21 and a plurality of rows of open flexible units 22, and each row of open supporting units 21 and each row of open flexible units 22 are connected end to end into a whole.

The open support unit 21 is formed by connecting a positive corrugated support rib 211 and a negative corrugated support rib 212. The open flexible unit 22 is formed by connecting a positive corrugated flexible rib 221 and a negative corrugated flexible rib 222. A predetermined number of open support cells 21 are connected to an axially adjacent predetermined number of open flexible cells 22 by two first connection points 23 and form a composite closed loop 40. The stent main body 20 further comprises connecting ribs 24, and two composite closed rings 40 which are adjacent along the axial direction of the intravascular stent are connected through the connecting ribs 24. "axial" means along the length of the stent.

Wherein the "positive corrugation" and the "negative corrugation" in the positive corrugated support rib 211 and the negative corrugated support rib 212 refer to: the positive corrugated support rib 211 and the negative corrugated support rib 212 may be corrugated and have opposite bending directions. For the same open support unit 21, the positive corrugated support rib 211 and the negative corrugated support rib 212 are symmetrical about the center line of the two. Similarly, "positive corrugation" and "negative corrugation" in the positive corrugation flexible rib 221 and the negative corrugation flexible rib 222 refer to: the positive corrugated flexible rib 221 and the negative corrugated flexible rib 212 may be corrugated and have opposite bending directions. For the same open flexible unit 22, the positive corrugated flexible rib 221 and the negative corrugated flexible rib 222 are symmetrical about the center line of the two.

The rib widths of the positive corrugated support rib 211 and the negative corrugated support rib 212 are larger than the rib widths of the positive corrugated flexible rib 221 and the negative corrugated flexible rib 222, so that the strength of the open support unit 21 is larger than that of the open flexible unit 22, and the deformation performance of the open flexible unit 22 is larger than that of the open support unit 21. The open supporting unit 21 provides the stent with moderate radial supporting force and good anchoring force, reduces excessive compression on the stenotic plaque and avoids plaque fragments from blocking the branch blood vessels. The open flexible units 22 keep the stent well flexible, avoid gaps with the blood vessel in the bent blood vessel and reduce the occurrence probability of restenosis. In the circumferential direction of the preset position of the blood vessel support, the ratio X of the number of the composite closed rings 40 to the diameter value D (mm) of the blood vessel support is 0.5-2, wherein the diameter value D of the blood vessel support is calculated by taking millimeters as a unit.

Preferably, the ratio X between the number of composite closed loops 40 and the diameter value d (mm) of the stent in the circumferential direction of the predetermined position of the stent is 1.

The included angle theta 1 formed by the positive corrugated support rib 211 and the negative corrugated support rib 212 of the same open support unit 21 is larger than the included angle theta 2 formed by the positive corrugated flexible rib 221 and the negative corrugated flexible rib 222 of the same open flexible unit 22, so that the open support unit 21 has high radial support strength, and the open flexible unit 22 has better compliance. Preferably, the included angle θ 1 formed by the positive corrugation support rib 211 and the negative corrugation support rib 212 of the same open support unit 21 is 45-90 °; the included angle theta 2 formed by the positive ripple flexible rib 221 and the negative ripple flexible rib 222 of the same open flexible unit 22 ranges from 430 degrees to 70 degrees.

In the first embodiment, each row includes 8 open support cells 21. Each row comprises 12 open flexible units. The composite closed loop 40 is a closed loop formed by two open support units 21 and three open flexible units 22 connected by two first connection points 23. The number ratio of the open supporting units 21 to the open flexible units 22 of the composite closed ring 40 is 2:3, and the connecting ribs 24 are in a straight shape. As shown in fig. 4, the two open supporting units are sequentially denoted as a first open supporting unit 71 and a second open supporting unit 72, respectively. The three open flexible cells are sequentially identified as a first open flexible cell 81, a second open flexible cell 82, and a third open flexible cell 83, respectively. The positive corrugated support rib 211 and the negative corrugated support rib 212 of the first open support unit 71 are connected by a second connection point 213. The positive corrugated support rib 211 and the negative corrugated support rib 212 of the second open support unit 72 are connected by a second connection point 214. The positive corrugated flexible ribs 221 and the negative corrugated flexible ribs 222 of the second open flexible unit 82 are connected by a third connection point 223. The connector rib 24 connects the third connection point 223 of the second open flexible unit 82 of one of the composite closed loops 40 with the second connection point 213 of the first open support unit 71 of another axially adjacent composite closed loop. In other embodiments, the connecting rib 24 may connect the third connecting point 223 of the second open flexible unit 82 of one of the composite closed loops with the second connecting point 214 of the second open support unit 72 of another composite closed loop that is axially adjacent.

In the first embodiment, the positive corrugated support ribs 211 and the negative corrugated support ribs 212 have the same rib width W1, the positive corrugated flexible ribs 221 and the negative corrugated flexible ribs 222 have the same rib width W2, and the rib width W1 is 1.2 times to 2.5 times the rib width W2. The number of the composite closed rings 40 is 2-10 along the circumferential direction of the intravascular stent; along the axial direction of the blood vessel support, the number of the composite closed rings 40 is 1-15. The length L2 of the stent body 20 accounts for 65% of the total length L of the stent.

The proximal end 30 of the stent is in a hollow funnel shape and comprises at least one row of closed-loop grids 31, an oblique-mouth reticulate pattern section 32, a connecting rod 33 and a developing sleeve 34. The closed-loop meshes 31 are arranged along the circumferential direction, and the closed-loop meshes 31 are closed meshes in a diamond shape and are consistent with the closed-loop meshes 11 at the far end 10 of the stent in shape. The stent proximal end 30 has 12 closed-loop meshes 32. The closed loop lattice 32 of the stent proximal end 30 is engaged with the stent body 20 to provide stable and effective push support. The bezel webbing sections 32 engage the closed-loop mesh 31 at the proximal end 30 of the stent to ensure complete retrieval into the protective sheath. The cross hatch mesh section 32 is formed in a funnel shape inclined toward the entire side wall of the stent and forms a tip connection point at its end. The connecting rod 33 is connected to the tip connection point of the bezel mesh section 32. The end of the connecting rod 33 has a circular hole 3301. The transfer wire 60 has a connecting ball 61 at one end. The connecting ball 61 on the conveying wire 60 is sleeved in the round hole of the connecting rod 33, and the connecting rod 33 and the connecting ball 61 are installed in the developing sleeve 34 together, so that the connection of the blood vessel stent and the conveying wire 60 is realized. That is, the round hole 3301 of the connecting rod 33 is used to cover the connecting ball 61 at one end of the feeding wire 60, and the developing sleeve 34 is covered at the position of the round hole 3301 of the connecting rod 33. Optionally, the length L3 of the stent proximal end 30 is 20% of the total length L of the stent.

The material used by the vascular stent is one of nickel-titanium alloy, cobalt-based alloy or stainless steel. After the vascular stent is completely released, the vascular stent is separated from the delivery wire 60 in an electrolytic stripping mode. The delivery wire 60 is led into a tiny constant current, and the release point can be slowly fused by electrolysis in a blood medium, so that the separation of the blood vessel stent and the delivery wire 60 is realized.

The blood vessel support also comprises a plurality of developing rings 50, and the developing rings 50 are used for displaying the opening effect of the blood vessel support in the blood vessel and accurately positioning the position of the blood vessel support in the blood vessel. Wherein a part of the developing ring 50 is disposed on the connecting rib 24 connecting the axially adjacent open supporting unit 21 and the open flexible unit 22 so as to make the stent main body 20 serving as the main supporting part accurately align with the stenotic plaque position of the blood vessel when implanted; another part of the visualization ring 50 is arranged at the location of the flare 101 of the distal end 10 of the stent in order to determine the position of the edge of the stent. In the present embodiment, the 8 developing rings 50 are distributed in the main frame body 20 in a row of four developing rings. By providing the developing ring, it is possible to facilitate the stent main body 20 to be accurately aligned with and cover the lesion site or plaque stenosis site of the blood vessel by the positioning action of the developing ring when the blood vessel stent is introduced into the blood vessel. The material of the developing ring 50 is one of platinum-tungsten alloy, platinum-iridium alloy or pure tantalum.

It is worth mentioning, the utility model discloses a 1mm ~ 5mm is big to the maximum diameter ratio of its support distal end 10 of intravascular stent 20 external diameters, makes support distal end 10 also can laminate the vascular wall closely like this, avoids intravascular stent shifts under the blood stream strikes, strengthens intravascular stent's stability.

The existing blood vessel stent has the problem that radial supporting force is too large to squeeze a narrow plaque, so that plaque fragments block a branch blood vessel to further cause infarction. Another problem is poor compliance and low chronic exo-tension, resulting in poor adherence and susceptibility to restenosis. The utility model provides a new blood vessel support for it is intracranial can solve two problems that current blood vessel support exists well, can compromise holding power and compliance, laminating nature simultaneously for performance optimization.

Fig. 6 shows another modified structure of the connecting rib 24 of the vascular stent. As shown in fig. 6, the connecting ribs 24 connecting two composite closed loops 40 adjacent to each other along the axial direction of the stent are in an omega shape.

Fig. 7 shows yet another modified structure of the connecting rib 24 of the vascular stent. As shown in fig. 7, the connecting ribs 24 connecting two composite closed loops 40 adjacent along the axial direction of the stent are S-shaped.

As shown in fig. 8, the structure of the vessel stent of the second embodiment is substantially the same as that of the first embodiment, except that the composite closed loop 40A is a closed loop formed by connecting three open supporting units and four open flexible units through two first connecting points 23A. In this embodiment, the number ratio of open support elements to open flexible elements of the composite closed loop 40A is 3: 4. The three open supporting units are sequentially referred to as a first open supporting unit 71A, a second open supporting unit 72A, and a third open supporting unit 73A, respectively. The four open flexible cells are respectively identified as a first open flexible cell 81A, a second open flexible cell 82A, a third open flexible cell 83A, and a fourth open flexible cell 84A in that order. The positive corrugated support rib 211A and the negative corrugated support rib 212A of the second open support unit 72A (i.e., the open support unit with the composite closed loop 40A in the middle position) are connected by a second connection point 213A. The positive corrugated flexible rib 221A and the negative corrugated flexible rib 222A of the second open flexible unit 82A are connected by a third connection point 223A, and the positive corrugated flexible rib 221A and the negative corrugated flexible rib 222A of the third open flexible unit 83A are connected by a third connection point 224A. The connector rib 24A connects the third connection point 223A of the second open flexible unit 82A of one of the composite closed loops 40A and the second connection point 213A of the second open support unit 72A of the axially adjacent other composite closed loop 40A. In other embodiments, the connecting rib 24A may also connect the third connection point 224A of the third open flexible unit 83A of one of the composite closed loops 40A and the second connection point 213A of the second open support unit 72A of another composite closed loop 40A that is axially adjacent.

As shown in fig. 9, the structure of the vessel stent of the third embodiment is substantially the same as that of the first embodiment, except that the composite closed loop 40B is a closed loop formed by connecting three open supporting units and five open flexible units through two first connecting points 23B. In this embodiment, the number ratio of open support elements to open flexible elements of the composite closed loop 40B is 3: 5. The three open supporting units are sequentially referred to as a first open supporting unit 71B, a second open supporting unit 72B, and a third open supporting unit 73B, respectively. The five open flexible units are respectively identified as a first open flexible unit 81B, a second open flexible unit 82B, a third open flexible unit 83B, a fourth open flexible unit 84B, and a fifth open flexible unit 85B in that order. The positive corrugated support rib 211B and the negative corrugated support rib 212B of the second open support unit 72B (i.e., the open support unit with the composite closed loop 40B in the middle position) are connected by a second connection point 213B. The positive corrugated flexible rib 221B and the negative corrugated flexible rib 222B of the third open flexible unit 83B are connected by a third connection point 223B. The connecting rib 24B connects the third connection point 223B of the third open flexible unit 83B of one of the composite closed loops 40B with the second connection point 213B of the second open support unit 72B of the other composite closed loop 40B that is axially adjacent.

The utility model provides an above-mentioned three embodiment only as the example, in other embodiments, the open supporting element number and the open flexible unit number of compound closed ring all can be other numerical values, and the proportion of the two numbers of open supporting element and the open flexible unit of compound closed ring also can be other proportions.

As shown in fig. 10 and 11, the structure of the vascular stent of the fourth embodiment of the present invention is substantially the same as that of the first embodiment, except for the proximal end 30C of the stent. In accordance with the structure of the distal end 10 of the stent, the proximal end 30C of the stent is also formed by connecting a plurality of rows (e.g., 2-5 rows) of closed-loop meshes 31C, one end of the proximal end 30C of the stent has an outwardly-expanding flared bell 301C, and the other end of the proximal end 30C of the stent is integrally connected with the stent body 20. The stent proximal end 30C has different diameters at different positions, and the diameter is larger at a position closer to the flare 301C of the stent proximal end 30C and smaller at a position closer to the stent main body 20. Optionally, the closed-loop mesh 31C is a closed mesh in a diamond shape. In other embodiments, the closed-loop mesh 31C may be a mesh with other shapes, such as a regular polygon. The closed-loop mesh 31C is connected by a positive ripple 311C and a negative ripple 312C. The number of the closed-loop grids 31C in each row in the circumferential direction is 5-20.

It is to be understood by persons skilled in the art that the embodiments of the present invention described above and shown in the drawings are given by way of example only and are not limiting of the present invention. The objects of the present invention have been fully and effectively accomplished. The functional and structural principles of the invention have been shown and described in the embodiments without departing from the principles of the invention, embodiments of the invention may be subject to any deformation and modification.

Claims

1. A vascular stent, comprising:

a stent proximal end;

the bracket far end is formed by connecting a plurality of rows of closed-loop grids, and one end of the bracket far end is provided with an outward-expanded horn mouth;

the stent main body is integrally connected between the distal end of the stent and the proximal end of the stent, so that the whole blood vessel stent forms a tubular shape, the stent main body is formed by alternately arranging a plurality of rows of open supporting units and a plurality of rows of open flexible units, each row of open supporting units and each row of open flexible units are integrally connected end to end, each open supporting unit is formed by connecting positive corrugated supporting ribs and negative corrugated supporting ribs, each open flexible unit is formed by connecting positive corrugated flexible ribs and negative corrugated flexible ribs, and a preset number of open supporting units and a preset number of axially adjacent open flexible units are connected through two first connecting points to form a composite closed ring; the stent main body further comprises a connecting rib, and two adjacent composite closed rings along the axial direction of the intravascular stent are connected through the connecting rib; the rib widths of the positive ripple supporting rib and the negative ripple supporting rib are larger than those of the positive ripple flexible rib and the negative ripple flexible rib, so that the strength of the open supporting unit is larger than that of the open flexible unit, and the deformation capacity of the open flexible unit is larger than that of the open supporting unit; the included angle formed by the positive corrugated supporting rib and the negative corrugated supporting rib of the same open supporting unit is larger than the included angle formed by the positive corrugated flexible rib and the negative corrugated flexible rib of the same open flexible unit.

2. The vascular stent according to claim 1, wherein the composite closed loop is a closed loop formed by connecting two open supporting units and three open flexible units, wherein the two open supporting units are sequentially and respectively denoted as a first open supporting unit and a second open supporting unit, the three open flexible units are sequentially and respectively denoted as a first open flexible unit, a second open flexible unit and a third open flexible unit, the respective positive corrugated supporting ribs and the respective reverse corrugated supporting ribs of the first open supporting unit and the second open supporting unit are connected through second connection points, and the positive corrugated flexible ribs and the reverse corrugated flexible ribs of the second open flexible unit are connected through third connection points; the connecting rib connects the second connection point of the first open support unit of one of the composite closed rings and the third connection point of the second flexible unit of the axially adjacent composite closed ring, or the connecting rib connects the second connection point of the second open support unit of one of the composite closed rings and the third connection point of the second flexible unit of the axially adjacent composite closed ring.

3. The vessel stent according to claim 1, wherein the composite closed loop is a closed loop formed by connecting three open supporting units and four open flexible units, wherein the three open supporting units are sequentially and respectively denoted as a first open supporting unit, a second open supporting unit and a third open supporting unit, the four open flexible units are sequentially and respectively denoted as a first open flexible unit, a second open flexible unit, a third open flexible unit and a fourth open flexible unit, wherein the positive corrugated supporting ribs and the reverse corrugated supporting ribs of the second open supporting unit are connected through a second connection point, and the positive corrugated flexible ribs and the reverse corrugated flexible ribs of the second open flexible unit and the third open flexible supporting unit are connected through a third connection point; the connecting rib connects the second connection point of the second open support unit of one of the composite closed rings and the third connection point of the second open flexible unit of the axially adjacent composite closed ring, or the connecting rib connects the second connection point of the second support unit of one of the composite closed rings and the third connection point of the third open flexible unit of the axially adjacent composite closed ring.

4. The vascular stent of claim 1, wherein the composite closed loop is a closed loop formed by connecting three open support units and five open flexible units, wherein the three open support units are sequentially and respectively denoted as a first open support unit, a second open support unit and a third open support unit, the five open flexible units are sequentially and respectively denoted as a first open flexible unit, a second open flexible unit, a third open flexible unit, a fourth open flexible unit and a fifth open flexible unit, wherein the positive corrugated support ribs and the negative corrugated support ribs of the second open support unit are connected through second connection points, and the positive corrugated flexible ribs and the negative corrugated flexible ribs of the third open flexible unit are connected through third connection points; the connecting rib connects the second connection point of the second open support unit of one of the composite closed loops with the third connection point of the third open flexible unit of an axially adjacent composite closed loop.

5. The vascular stent of any one of claims 1-4, wherein the connecting ribs are one of a straight shape, an omega shape or an S shape.

6. The vascular stent of any one of claims 1-4, wherein the positive corrugated struts and the negative corrugated struts of the open support cells have the same rib width W1, the positive corrugated flexible ribs and the negative corrugated flexible ribs of the open flexible cells have the same rib width W2, and the rib width W1 is 1.2 to 2.5 times the rib width W2; the side wall of the far end of the bracket at the bell mouth position and the central axis of the blood vessel bracket form an included angle of 10-30 degrees.

7. The vessel support according to any one of claims 1 to 4, wherein the proximal end of the support is formed by connecting a plurality of rows of closed-loop meshes, and one end of the proximal end of the support is provided with a flared bell mouth.

8. The vessel support according to any one of claims 1 to 4, wherein the proximal end of the support comprises a bezel mesh section, a connecting rod, at least one row of closed-loop meshes and a developing sleeve, the closed-loop meshes at the proximal end of the support are jointed to the support body, the bezel mesh section is jointed to the closed-loop meshes at the proximal end of the support, the bezel mesh section forms a funnel shape inclined towards the whole side wall of one side of the vessel support and forms a tip connecting point at the end of the bezel mesh section, the connecting rod is connected to the tip connecting point, the end of the connecting rod is provided with a round hole, the round hole of the connecting rod is used for sheathing the connecting ball at one end of the conveying wire, and the developing sleeve is sleeved at the position of the round hole of the; the vascular stent comprises a plurality of developing rings, wherein one part of the developing rings are arranged on the connecting ribs, and the other part of the developing rings are arranged at the bell mouth position at the far end of the stent; after the vascular stent is completely released, the vascular stent is separated from the delivery wire in an electrolytic stripping mode.

9. The vascular stent according to any one of claims 1 to 4, wherein the included angle formed by the positive corrugated supporting ribs and the negative corrugated supporting ribs of the same open supporting unit ranges from 45 degrees to 90 degrees, and the included angle formed by the positive corrugated flexible ribs and the negative corrugated flexible ribs of the same open flexible unit ranges from 30 degrees to 70 degrees.

10. The vessel support according to any one of claims 1 to 4, wherein the ratio X of the number of the composite closed loops to the diameter value of the vessel support in the circumferential direction of the predetermined position of the vessel support is 0.5-2, wherein the diameter value of the vessel support is calculated by millimeter.