CN219763447U - Vascular implantation bracket - Google Patents

Abstract

The utility model discloses a vascular implantation stent, which comprises a stent body (10) and one or more groups of developing marks arranged in the stent body; -said rack body (10) comprising one or more sub-racks; the plurality of adjacent sub-brackets are connected with each other; each sub-rack further comprises a diamond-shaped unit (101), a first open unit (102) and a second open unit (103) which are connected in sequence. The utility model has simple structure, convenient operation and easy grasp. The utility model can reduce the metal coverage rate, reduce the vascular endothelial hyperplasia, simultaneously has the characteristic of multipoint development, is visible in the whole process in the operation, ensures the safety of operation, supports the blood vessel through a plurality of diamond units, improves the radial supporting force and the compliance of the bracket, has better vascular adherence, and can effectively assist the treatment of the spring ring for plugging the aneurysm.

Description

Vascular implantation bracket

Technical Field

The utility model relates to the technical field of medical instruments, in particular to a vascular implantation stent.

Background

Intracranial aneurysms are abnormal distensions and engorgements on the arterial wall of cerebral vessels, usually occurring near the bifurcation of arterial vessel segments, and are most common in people between 35 and 60 years old.

Aneurysms can stress nerve or brain tissue when inflated, manifesting as fatigue, peripheral vision disorders, thought disorders, speech complications, loss of balance and coordination, and the like. The most serious sequelae of intracranial aneurysms are rupture of the aneurysm and subsequent subarachnoid hemorrhage (SAH). Relevant statistics show that the death rate of intracranial aneurysms patients in China in 2019 is about 50%, and the probability of causing the nervous system diseases accounts for 30-50%.

The etiology of intracranial aneurysms is currently unknown in medical research. It is believed that the cause of intracranial aneurysms is abnormal degenerative changes in tissue and the arterial pressure caused by the forward pumping of blood flow through the aneurysm. The most common way to surgically intervene in treating aneurysms is to implant a vascular stent.

The prior vascular stent/auxiliary stent for treating the aneurysm mainly comprises a braiding structure and a laser cutting structure. Wherein: the braided structure stent has the characteristic of full-process development, but the high metal coverage rate of the stent is easy to stimulate blood vessels to cause endothelial hyperplasia, so that the inner stenosis of the stent in the later stage is much higher than that of the common stent. The laser cutting stent has the characteristics of low metal coverage rate, low late stent internal stenosis rate and the like, and the opening form of the stent cannot be accurately judged in the operation process because the existing laser cutting stent only has developing marks at two ends of the stent.

In addition, the anatomical form of the cerebral blood vessel is complicated, and the cerebral blood vessel has more and less tortuosity than coronary artery and peripheral blood vessel. For example, the included angle of the blood vessel bending of the cavernous sinus section of the internal carotid artery is 20-90 degrees, and the bending radius is 2-4.5 mm, so that the requirement on the intravascular stent implanted in the blood vessel is that the intravascular stent must have enough compliance, and the requirement is that the intravascular stent has enough radial supporting force. The existing cerebrovascular stent has excessive radial supporting force and insufficient compliance, is only suitable for being implanted into arterial vessels with larger diameters and smaller curvature of the heart, and is not suitable for interventional therapy under the conditions of small included angle of intracranial/cerebrovascular curvature and small bending radius. For example, the application number is CN202011379347.3, entitled "a super-cis nickel-titanium alloy intracranial vascular stent with micro-nano structure", which discloses an intracranial vascular stent made of alloy material cut by laser, because of adopting a relatively dense closed loop structure, the intracranial vascular stent has relatively large radial supporting force, thus providing relatively good mechanical support for the neck of a lesion of a complex aneurysm (with a large curvature blood vessel and a reducing blood vessel) such as a large and wide carotid artery, but is not applicable for the intracranial/cerebral vascular lesion with a small included angle of blood vessel bending and a small bending radius.

Therefore, there is a need to design an improved intracranial vascular aneurysm stent that overcomes the shortcomings of the prior stent designs.

Disclosure of Invention

Accordingly, a primary object of the present utility model is to provide a vascular implant stent, so that the vascular implant stent has a multi-point visualization characteristic to ensure the safety of the operation; another object is to improve the structural design to have better compliance and matched radial supporting force to adapt to the conditions of small included angle of vascular curvature and small bending radius; it is still another object to provide a superior vascular adhesion.

In order to achieve the above purpose, the technical scheme of the utility model is as follows:

a vascular implantation stent, which comprises a stent body and one or more groups of developing marks arranged in the stent body; the bracket body comprises one or more sub-brackets; the plurality of adjacent sub-brackets are connected with each other; each sub-stent further comprises a diamond-shaped unit, a first open unit and a second open unit which are connected in sequence.

Wherein: the number of the plurality of sub-brackets is at least 2.

The plurality of sets of developing marks includes: the first developing mark is arranged at the proximal end of the diamond-shaped unit in the sub-bracket, the second developing mark is arranged at the distal end of the diamond-shaped unit, and the third developing mark is arranged at the distal end of the second open unit; the first developing mark, the second developing mark and the third developing mark all comprise a plurality of developing points.

The diamond-shaped units are uniformly distributed in the radial direction of the bracket body in a surrounding manner; the distal ends of the diamond-shaped cells are connected to the first open cell by a first connection point.

The first open unit is W-shaped, the proximal end is connected with the diamond-shaped unit through a first connecting point, and the distal end is connected with the second open unit through a second connecting point.

The second open unit is W-shaped, the proximal end is connected with the distal end of the first open unit through a second connection point, and the distal end is connected with the diamond-shaped unit of the adjacent sub-bracket through a third connection point.

The number of the unit rods of the first open units is 12-20; the included angle between the two rods of the first open unit is 30-70 degrees; the number of the unit rods of the second open units is 12-28; the included angle between the two unit rods of the second open unit is 15-60 degrees.

The number of connection points between the diamond-shaped units and the first open units is 2-6; the number of the connection points of the first open units and the second open units is 2-6.

The number of the fourth connection points of the second open units and the diamond-shaped units of the adjacent sub-brackets is 2-6.

The first connecting points, the second connecting points, the third connecting points and the fourth connecting points are distributed in a staggered manner; the first connecting point, the second connecting point, the third connecting point and the fourth connecting point are spirally distributed around the radial direction of the bracket body.

The vascular implantation stent has the following beneficial effects:

the vascular implantation stent is opened and released at an aneurysm of a bent blood vessel in an interventional operation mode, and completely covers the aneurysm, and passes through the middle part of the vascular implantation stent through a microcatheter in the interventional operation mode again to enter the aneurysm, wherein the microcatheter can freely move in the aneurysm; then the spring ring is released, the aneurysm is fully filled, then the spring ring is released, the microcatheter is withdrawn, the metal coverage rate can be reduced, the vascular endothelial hyperplasia is reduced, the late stent stenosis rate is low, the multipoint development characteristic is realized, the whole process is visible in the operation, and the operation safety is ensured. The blood vessel is supported by the diamond units, so that the compliance of the bracket and proper radial supporting force are improved, and the blood vessel wall attaching performance is better.

Drawings

FIG. 1 is a schematic view of a deployed configuration of a vascular implant stent of the present utility model;

FIG. 2 is a schematic view of the unit connection structure of the vascular implant stent of the present utility model;

FIG. 3 is a schematic view showing the distribution of the connection points of the vascular implant stent of the present utility model;

FIG. 4 is a schematic view of the connection point structure of the vascular implant stent of the present utility model;

FIG. 5 is a schematic view of a development mark structure of a vascular implant stent according to the present utility model;

FIG. 6 is an enlarged view of the development mark of the stent for vascular implantation according to the present utility model;

FIG. 7 is a schematic view of the internal void structure of the vascular implant stent of the present utility model;

FIG. 8 is a schematic view of the intraoperative structure of the vascular implant stent of the present utility model;

fig. 9 is a schematic view of the post-operation structure of the vascular implant stent of the present utility model.

[ Main part/reference numerals Specification ]

10: bracket body

10a: the first sub-mount 10b: the second sub-mount 10c: third sub-mount 10d: fourth sub-support

100: first developing mark

101: diamond unit 1011: first intersection 1012: second intersection point

102: the first opening unit 1021: third intersection point

103: the second open unit 1031: fourth intersection point

104: second developing mark

105: third developing mark

106: connecting part

1061: first connection point 1062: second connection point

1063: third connection point 1064: and a fourth connection point.

Detailed Description

The present utility model will be described in further detail with reference to the accompanying drawings.

For a clearer description and description of embodiments of the utility model, reference is made to one or more drawings, but the accompanying details or examples used to describe the drawings are not limiting the scope of any one of the utility model, the presently described embodiments or the preferred modes of carrying out the utility model. Unless defined otherwise, all technical or scientific terms used in the specification of the present utility model have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model.

The term "proximal" as used herein generally refers to a direction toward the operator; "distal" refers to a direction away from the operator.

Fig. 1 is a schematic view showing a developed structure of a stent for vascular implantation according to the present utility model.

As shown in fig. 1, the vascular implant stent comprises a stent body 10 and a plurality of groups of developing marks arranged therein. The stent body 10 comprises one or more sub-stents, and each set of developing indicia comprises a plurality of developing points. The vascular implantation stent is made of nickel-titanium alloy or cobalt-based alloy.

In this embodiment, the rack body 10 includes a first sub-rack 10a, a second sub-rack 10b, a third sub-rack 10c, and a fourth sub-rack 10d. The plurality of sets of developed indicia includes a first developed indicia 100, a second developed indicia 104 (at least one set), and a third developed indicia 105. The first developed indicia 100, the second developed indicia 104, and the third developed indicia 105 each comprise a plurality of developed dots. The first developing mark 100 includes a plurality of developing points, and the number of developing points is generally 2 to 4. Preferably, the number is 3.

In this embodiment, as shown in fig. 1, adjacent sub-stents are fixedly connected to form the vascular implant stent. Each sub-rack comprises a diamond-shaped unit 101, a first open unit 102 and a second open unit 103.

Here, taking the first sub-frame 10a as an example, the proximal end of the diamond-shaped unit 101 is provided with 1 or more first developing marks 100, the distal end of the diamond-shaped unit 101 is connected to the proximal end of the first open unit 102, the distal end of the first open unit 102 is connected to the proximal end of the second open unit 103, the distal end of the second open unit 103 is connected to the proximal end of the diamond-shaped unit 101 in the second sub-frame 10b, and the proximal end of the first open unit 102 of the second sub-frame 10b is connected to the distal end of the diamond-shaped unit 101. The distal end of which is connected to the proximal end of the second open cell 103. The remaining third sub-rack 10c and fourth sub-rack 10d are similar to each other, and will not be described again.

In this embodiment, the second developing mark 104 is disposed at the distal suspended portion of the diamond-shaped unit 101 of the second sub-frame 10b, the third sub-frame 10c, and the fourth sub-frame 10d, as shown in fig. 6. The second developing marks 104 are arranged at the distal suspended parts of the diamond-shaped units 101 of the third sub-support 10c and the fourth sub-support 10d of the second sub-support 10b, and three groups of the second developing marks are provided, and each group is provided with 2 to 4 developing points. Preferably, the number of developing points per set is 3.

In other embodiments, the number of sub-stents in the vascular implant stent can be increased or decreased according to actual needs, generally 2 to 5 sub-stents can be provided, and more sub-stents can be provided.

In the present embodiment, the distal end of the second open unit 103 of the fourth sub-mount 10d is provided with a third developing mark 105. The number of the developing points of the third developing mark 105 is 2 to 4. Preferably, the number is 3.

Fig. 2 is a schematic diagram of a unit connection structure of the vascular implant stent of the present utility model, and fig. 3 is a schematic diagram of a distribution of connection points of the vascular implant stent of the present utility model.

As shown in fig. 2 and 3, in the schematic connection structure, the diamond units 101 are uniformly distributed around the radial direction of the vascular implantation stent body 10. The number of the diamond-shaped units 101 is 10 to 26. Preferably, the number of diamond-shaped units 101 is 12.

The first open cells 102 are in a "W" shape, and the number of cell bars of the first open cells 102 is 12 to 20. Preferably, the number is 16. The angle between the two bars of the first open cell 102 is 30 deg. to 70 deg.. Preferably, the included angle is 60 °.

The second open cells 103 are also in a "W" shape, and the number of cell bars of the second open cells 103 is 12 to 28. Preferably, the number is 24. The number of connection points between the second open unit 103 and the first open unit 102 is 2 to 6, preferably 4.

As shown in fig. 3, the connection points 106 are uniformly distributed; the included angle between the two unit bars of the second open unit 103 is 15 ° to 60 °. Preferably, the included angle is 30 °.

Referring to fig. 2, each diamond cell of the diamond unit 101 intersects at a first intersection point 1011; the diamond-shaped cell sides of the diamond-shaped cells 101 intersect at a second intersection point 1012, and the second intersection point 1012 is in a circular arc shape. The bars of the first open cell 102 intersect at a third intersection point 1021. The bars of the second open cell 103 intersect at a fourth intersection point 1031 (not shown).

The connection points 106 include a first connection point 1061, a second connection point 1062, and a third connection point 1063. Wherein:

the first connection points 1061 are connection points between the diamond-shaped units 101 and the first open units 102 of each sub-rack, and the number of the first connection points 1061 is 2-6. Preferably, the number of the first connection points 1061 is 4.

The second connection points 1062 are connection points of the first open unit 102 and the second open unit 103 of each sub-rack, and the number of the second connection points 1062 is 2-6. Preferably, the number of the second connection points 1062 is 4.

The third connection points 1063 are connection points between the second open units 103 of the first sub-rack 10a and the diamond-shaped units 101 of the second sub-rack 10b, and the number of the third connection points 1063 is 2-6. Preferably, the number of the third connection points 1063 is 4.

The fourth connection point 1064 is a connection point between the diamond-shaped unit 101 of the second sub-bracket 10b and the first open unit 102 of the third sub-bracket 10c, and the number of the third connection points 1064 is 2-6. Preferably, the number of the fourth connection points 1064 is 4.

Referring to fig. 3, in the present embodiment, the number of the connection portions 106 is 4. The two connection points of the connection portion 106 include a partially open cell of the diamond-shaped unit 101 and the first open unit 102. Preferably, the number of open cells of the diamond-shaped cells 101 is 2, and the number of open cells of the first open cells 102 is 1; the first open cells 102 and the second open cells 103 are shown as including open cells between the connecting portions 106. Preferably, the number of open cells of the first open unit 102 is 1, and the number of open cells of the second open unit 103 is 2.

The first connection point 1061 is staggered with respect to the second connection point 1062, the third connection point 1063, and the fourth connection point 1064. In the vascular implant stent in the actual use state, the first connection point 1061, the second connection point 1062, the third connection point 1063, and the fourth connection point 1064 are spirally distributed around the radial direction of the stent body, and are substantially linearly distributed in the stent deployment view, referring to fig. 3.

The unit bars of the diamond units 101 in the respective sub-brackets are arc-shaped. The cell bars of the first open cells 102 are circular arc-shaped. The second intersection 1012 of the diamond-shaped cell 101 intersects the third intersection 1021 of the first open cell 102 at the connection 106, see fig. 4.

Fig. 5 is a schematic view showing a developing mark structure of the vascular implant stent of the present utility model.

As shown in fig. 5, the second developing marks 104 are provided on the second intersecting points 1012 of the second sub-mount 10b, and preferably the number of the second developing marks 104 is 3. The second developing mark 104 is made of platinum iridium alloy or platinum tungsten alloy, preferably platinum iridium alloy. The second developing mark 104 is designed in a screw shape by winding and is fixed to the second crossing point 1012 of the second sub-mount 10b by welding, referring to fig. 6.

Fig. 7 is a schematic view of the internal void structure of the vascular implant stent of the present utility model.

As shown in fig. 7, the diameter of the inscribed circle formed between the unit bars of the diamond-shaped unit 101 (at the first intersection point 1011) is 0.5mm to 2mm, and preferably, the inscribed circle diameter is 1.2mm.

The diameter of the inscribed circle formed between the unit bars of the diamond-shaped units 101 and the unit bars of the first open units 102 (at the third intersection point 1021) is 0.5mm to 2mm, and preferably, the inscribed circle diameter is 1.5mm.

The diameter of the inscribed circle formed between the unit bars of the first open cells 102 and the unit bars of the second open cells 103 (at the fourth intersection point 1031) is 0.5mm to 2mm, and preferably, the inscribed circle diameter is 0.9mm.

Fig. 8 is a schematic view of an intraoperative structure of the vascular implant stent of the present utility model, and fig. 9 is a schematic view of a postoperative structure of the vascular implant stent of the present utility model.

As shown in fig. 8 and 9, the vascular implant stent is opened and released at the aneurysm of the curved blood vessel by an interventional operation, and completely covers the aneurysm. The catheter passes through the middle part of the vascular implantation stent through the interventional operation mode again, and enters the aneurysm, and the catheter can freely move in the aneurysm; the coil is then released, the aneurysm is fully filled, and the coil is then released, and the microcatheter is withdrawn.

The foregoing description is only of the preferred embodiments of the present utility model, and is not intended to limit the scope of the present utility model.

Claims (10)

1. A vascular implantation stent, characterized by comprising a stent body (10) and one or more groups of developing marks arranged therein; -said rack body (10) comprising one or more sub-racks; the plurality of adjacent sub-brackets are connected with each other; each sub-rack further comprises a diamond-shaped unit (101), a first open unit (102) and a second open unit (103) which are connected in sequence.

2. The vascular implant stent of claim 1, wherein the number of the plurality of sub-stents is at least 2.

3. The vascular implant stent of claim 1, wherein the plurality of sets of visualization markers comprises: a first developing mark (100) arranged at the proximal end of the diamond-shaped unit (101) in the sub-bracket, a second developing mark (104) arranged at the distal end of the diamond-shaped unit (101), and a third developing mark (105) arranged at the distal end of the second open unit (103); the first developing mark (100), the second developing mark (104) and the third developing mark (105) all comprise a plurality of developing points.

4. The vascular implant stent according to claim 1, wherein the diamond-shaped units (101) are uniformly distributed around the radial direction of the stent body (10); the distal ends of the diamond-shaped cells (101) are connected to the first open cells (102) by first connection points (1061).

5. The vascular implant stent according to claim 1, wherein the first open cells (102) are W-shaped, connected at a proximal end to the diamond-shaped cells (101) by a first connection point (1061) and at a distal end to the second open cells (103) by a second connection point (1062).

6. The vascular implant stent according to claim 1, wherein the second open cells (103) are W-shaped, the proximal ends being connected to the distal ends of the first open cells (102) by second connection points (1062), and the distal ends being connected to the diamond-shaped cells (101) of the adjacent sub-stent by third connection points (1063).

7. The vascular implant stent according to claim 1 or 5, wherein the number of cell rods of the first open cells (102) is 12-20; the included angle between the two rods of the first open unit (102) is 30-70 degrees; the number of the unit rods of the second open units (103) is 12-28; the included angle between the two unit rods of the second open unit (103) is 15-60 degrees.

8. The vascular implant stent according to any of claims 1, 5 or 6, wherein the number of connection points of the diamond-shaped cells (101) to the first open cells (102) is 2-6; the number of connection points between the first open cells (102) and the second open cells (103) is 2-6.

9. The vascular implant stent according to claim 1, wherein the number of fourth connection points (1064) of the second open cells (103) with the diamond-shaped cells (101) of an adjacent sub-stent is 2-6.

10. The vascular implant stent according to any of claims 1-6 or 9, wherein the first connection points (1061), the second connection points (1062), the third connection points (1063), the fourth connection points (1064) are staggered; the first connecting point (1061), the second connecting point (1062), the third connecting point (1063) and the fourth connecting point (1064) are spirally distributed around the radial direction of the stent body (10).