CN115702842A - Medical support - Google Patents
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- CN115702842A CN115702842A CN202110939150.9A CN202110939150A CN115702842A CN 115702842 A CN115702842 A CN 115702842A CN 202110939150 A CN202110939150 A CN 202110939150A CN 115702842 A CN115702842 A CN 115702842A
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- 239000002356 single layer Substances 0.000 claims abstract description 63
- 238000009941 weaving Methods 0.000 claims abstract description 30
- 238000009954 braiding Methods 0.000 claims description 12
- 230000004323 axial length Effects 0.000 claims description 5
- 239000010410 layer Substances 0.000 abstract description 30
- 208000007536 Thrombosis Diseases 0.000 abstract description 9
- 238000000034 method Methods 0.000 abstract description 5
- 230000008569 process Effects 0.000 abstract description 4
- 238000007493 shaping process Methods 0.000 abstract description 2
- 238000009940 knitting Methods 0.000 description 19
- 210000004204 blood vessel Anatomy 0.000 description 10
- 230000000694 effects Effects 0.000 description 8
- 208000031481 Pathologic Constriction Diseases 0.000 description 4
- 238000004873 anchoring Methods 0.000 description 4
- 230000036262 stenosis Effects 0.000 description 4
- 208000037804 stenosis Diseases 0.000 description 4
- 238000004804 winding Methods 0.000 description 4
- 206010061751 Cerebrovascular stenosis Diseases 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000002792 vascular Effects 0.000 description 3
- WAIPAZQMEIHHTJ-UHFFFAOYSA-N [Cr].[Co] Chemical class [Cr].[Co] WAIPAZQMEIHHTJ-UHFFFAOYSA-N 0.000 description 2
- 238000007917 intracranial administration Methods 0.000 description 2
- 230000000302 ischemic effect Effects 0.000 description 2
- 230000003902 lesion Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910001000 nickel titanium Inorganic materials 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 2
- 239000010937 tungsten Substances 0.000 description 2
- 229910052721 tungsten Inorganic materials 0.000 description 2
- 206010069729 Collateral circulation Diseases 0.000 description 1
- 241000248459 Stentor Species 0.000 description 1
- 206010057469 Vascular stenosis Diseases 0.000 description 1
- 210000001367 artery Anatomy 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000008280 blood Substances 0.000 description 1
- 210000004369 blood Anatomy 0.000 description 1
- 230000008081 blood perfusion Effects 0.000 description 1
- 230000036770 blood supply Effects 0.000 description 1
- 210000004556 brain Anatomy 0.000 description 1
- 210000004958 brain cell Anatomy 0.000 description 1
- 210000001715 carotid artery Anatomy 0.000 description 1
- 208000006170 carotid stenosis Diseases 0.000 description 1
- 230000002490 cerebral effect Effects 0.000 description 1
- 208000026106 cerebrovascular disease Diseases 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 210000004351 coronary vessel Anatomy 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 238000002651 drug therapy Methods 0.000 description 1
- 230000000004 hemodynamic effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 239000002905 metal composite material Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- ZONODCCBXBRQEZ-UHFFFAOYSA-N platinum tungsten Chemical compound [W].[Pt] ZONODCCBXBRQEZ-UHFFFAOYSA-N 0.000 description 1
- HWLDNSXPUQTBOD-UHFFFAOYSA-N platinum-iridium alloy Chemical compound [Ir].[Pt] HWLDNSXPUQTBOD-UHFFFAOYSA-N 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/82—Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/86—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure
- A61F2/90—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure
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- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Cardiology (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Transplantation (AREA)
- Heart & Thoracic Surgery (AREA)
- Vascular Medicine (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Media Introduction/Drainage Providing Device (AREA)
Abstract
The invention provides a medical stent, which is a tubular body formed by integrally weaving thick wires and thin wires, and comprises a head section, a middle section and a tail section which are sequentially connected; wherein the head section and the tail section comprise a first mesh structure formed by co-weaving the thick filaments and the thin filaments; the middle section comprises a second mesh structure formed by a first single-layer mesh structure formed by the coarse wire weaving and a second single-layer mesh structure formed by the fine wire weaving, which are overlaid with each other. The interlude of medical support is bilayer structure, when utilizing the thick silk mesh structure of individual layer to guarantee support interlude adherence performance, also protects the plaque coverage rate through the thin silk mesh structure of individual layer and prevents the thrombus escape, just medical support is woven by thick silk and thin silk an organic whole and is woven the shaping, and it is simple high-efficient with the assembly process to weave.
Description
Technical Field
The invention relates to the technical field of medical instruments, in particular to a medical stent.
Background
Cerebrovascular stenosis is an important cause and risk factor for ischemic cerebrovascular disease, including common carotid stenosis and intracranial vascular stenosis, which affect the blood supply to the brain and may ultimately lead to ischemic death of brain cells.
There are three main treatment modes for cerebrovascular stenosis, which are drug treatment, surgical treatment and vascular stent treatment. The drug therapy is not suitable for the patients with severe stenosis or many stenosis accompanied by improvement of cerebral tissue blood perfusion by promoting collateral circulation compensation, the surgical operation treatment is traumatic, the treatment is not endured by the aged patients, and the vascular stent therapy is well known for its micro-invasiveness, low invasiveness, high operation effect and easy implementation, and has been gradually developed in recent years.
Aiming at the blood vessel stent treatment of the cerebrovascular stenosis, the thrombus taking and the stent placing are divided into two types, when a patient is in-situ stenosis, plaques cannot be taken out in a stent mechanical embedding mode, or the condition of blood vessels is poor, and even if the stenosis is easily formed again after the plaque is taken out, the aim of treatment can be achieved only by placing the stent. Such stents need to have the following properties: (1) The mesh density is proper, plaque is covered, and the catastrophic effect caused by the escape of thrombus to the far end is prevented; (2) The stent has good adherence, good bending flexibility, rich and complex cerebrovascular morphology and circuitous blood path, and the stent is not required to influence the hemodynamics at the position after being placed and can not generate thrombus due to the gap between the stent and the vessel wall; and (3) the head end opening adherence performance is good.
Disclosure of Invention
The invention aims to provide a medical stent which can meet various performance requirements.
Based on the thought, the invention provides a medical stent, which is a tubular body formed by integrally weaving thick wires and thin wires, and comprises a head section, a middle section and a tail section which are connected in sequence; wherein,
the head section and the tail section comprise a first mesh structure formed by co-weaving the thick filaments and the thin filaments;
the intermediate section comprises a second mesh structure comprising a first single layer of mesh structure formed by the coarse yarn weave and a second single layer of mesh structure formed by the fine yarn weave, the first and second single layer of mesh structures overlying one another.
Optionally, in the medical stent, the medical stent is formed by interweaving braided wires with opposite spiral directions, and the braided wires in each spiral direction include the thick wires and the thin wires.
Optionally, in the medical stent, the number of the thick filaments and the number of the thin filaments of the first mesh structure are in a ratio of m: n are alternately arranged at intervals, wherein m and n are positive integers.
Optionally, in the medical stent, the number of the filaments is greater than or equal to the number of the thick filaments.
Optionally, in the medical stent, the medical stent includes twisted structures with opposite spiral directions, and each twisted structure is formed by mutually winding and interweaving the thick wires and/or the thin wires.
Optionally, in the medical stent, each of the kinking structures comprises one of the thick filaments and one of the thin filaments intertwined with each other.
Optionally, in the medical stent, the head section and/or the tail section includes a flared section, the flared section gradually expands outward in a direction away from the middle section, and the flared section is formed by extending and braiding the thick wires and/or the thin wires in a first direction and then back rotating to extend and braid in a second direction, and the second direction is opposite to the first direction.
Optionally, in the medical stent, a flare angle of the flared section relative to an axis of the middle section is 5 ° to 75 °.
Optionally, in the medical stent, the flaring section includes a first flaring structure formed by extending and braiding the thick wires in the first direction and then back and forth and extending and braiding the thick wires in the second direction, and a second flaring structure formed by extending and braiding the thin wires in the first direction and back and forth and extending and braiding the thin wires in the second direction.
Optionally, in the medical stent, the first flaring structure is farther from the intermediate section than the second flaring structure, or the second flaring structure and the first flaring structure are equidistant from the intermediate section.
Optionally, in the medical stent, the flaring angles of the first flaring structure and the second flaring structure relative to the axis of the middle section are the same.
Optionally, in the medical stent, the axial length of the middle section accounts for 40% to 95% of the total length of the medical stent.
Optionally, in the medical stent, the mesh area of the third single-layer mesh structure is 0.01mm 2 ～1mm 2 And the mesh area of the second single-layer mesh structure is more than 4 times that of the third single-layer mesh structure.
Optionally, in the medical stent, the second mesh structure further includes a third single-layer mesh structure woven by the thick filaments or the thin filaments, and the third single-layer mesh structure is mutually covered with the first single-layer mesh structure, or the third single-layer mesh structure is mutually covered with the second single-layer mesh structure.
Optionally, in the medical stent, the first mesh structure is a single-layer structure.
In summary, the present invention provides a medical stent, which is a tubular body integrally woven from thick filaments and thin filaments, and comprises a head section, a middle section and a tail section which are connected in sequence; wherein the head section and the tail section comprise a first mesh structure formed by co-weaving the thick filaments and the thin filaments; the middle section is a second mesh structure formed by mutually covering a first single-layer mesh structure formed by weaving the thick wires and a second single-layer mesh structure formed by weaving the thin wires. Compared with the existing bracket, the bracket has the following advantages:
(1) The middle section of the medical stent ensures the adherence performance of the middle section of the stent by using the first single-layer mesh structure, and simultaneously ensures the plaque coverage rate by using the second single-layer mesh structure to prevent thrombus from escaping;
(2) The medical support is integrally formed by weaving thick wires and thin wires, and the weaving and assembling process is simple and efficient.
(3) Furthermore, the head end and/or the tail end of the medical stent adopt a back-woven design, no thread is exposed, and the thread can be prevented from being exposed to damage the vascular wall;
(4) Furthermore, the head end and/or the tail end of the medical stent adopt a back-braiding design to form a flared section, so that the stent is easier to open after being pushed out of the microcatheter, and the anchoring capacity of the end part of the stent is improved;
(5) Furthermore, the head section and the tail section of the medical support are of a single-layer mixed weaving structure, and assembly and conveying are facilitated.
Drawings
Fig. 1 is a schematic structural diagram of a medical stent according to an embodiment of the present invention;
FIG. 2 is a schematic view of another embodiment of a medical stent of the present invention;
FIGS. 3a to 3d are schematic views showing a state where the first mesh structure is in contact with a blood vessel wall according to a first embodiment of the present invention;
FIGS. 4a to 4b are views each showing an example of a state in which the second mesh structure is in contact with a blood vessel wall in the first embodiment of the present invention;
FIG. 5 is a schematic diagram illustrating a weaving pattern of the mesh structure according to an embodiment of the present invention;
FIG. 6 is a schematic structural view of a medical stent including a first flared section according to an embodiment of the present invention;
FIG. 7 is a schematic structural view of a medical stent including a first flared section and a second flared section according to an embodiment of the present invention;
FIG. 8 is a structural view of a medical stent including a first flared section according to a second embodiment of the present invention;
FIG. 9 is a structural view of a medical stent including a second flared section according to a second embodiment of the present invention;
FIG. 10 is a schematic structural diagram of a twisting structure according to a second embodiment of the present invention;
wherein the reference numerals are as follows:
11-head segment; 12-middle section; 13-tail section;
1-coarse silk; 2-filament; 3-the vessel wall;
10-a first mesh structure; 20-a first monolayer mesh structure; 30-a second monolayer mesh structure;
101-a first flare structure; 102-second flaring structure.
Detailed Description
To make the objects, advantages and features of the present invention more apparent, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It is to be noted that the drawings are in greatly simplified form and are not to scale, but are merely intended to facilitate and clarify the explanation of the embodiments of the present invention. Further, the structures illustrated in the drawings are often part of actual structures. In particular, the drawings may have different emphasis points and may sometimes be scaled differently. It should also be understood that the terms "first," "second," "third," and the like in the description are used for distinguishing between various components, elements, steps, and the like, and not for describing a sequential or logical relationship between various components, elements, steps, or the like, unless otherwise specified or indicated.
[ EXAMPLES one ]
Referring to fig. 1 and 2, the present embodiment provides a medical stent, which is a tubular body integrally braided by thick filaments 1 and thin filaments 2, and includes a head section 100, a middle section 200 and a tail section 300, which are sequentially connected, wherein,
the head section 100 and the tail section 300 comprise a first mesh structure 10, and the first mesh structure 10 is formed by co-weaving the thick filaments 1 and the thin filaments 2;
the intermediate section 200 comprises a second mesh structure formed by the mutual covering of a first single-layer mesh structure 20 formed by the weaving of the thick filaments 1 and a second single-layer mesh structure 30 formed by the weaving of the thin filaments 2.
This embodiment provides medical stent, interlude 200 are bilayer structure, and the second individual layer mesh structure 30 that first individual layer mesh structure 20 and filament 2 woven that are woven by thick silk 1 cover each other and form, when utilizing first individual layer mesh structure 20 to guarantee support interlude 200 adherence performance, also protect the plaque coverage through second individual layer mesh structure 30 and prevent the thrombus escape, just medical stent is woven by thick silk 1 and filament 2 integrated into one piece, weaves and the simple high efficiency of assembly process.
In still other embodiments, the second mesh structure may further include a third single layer mesh structure (not shown) formed by weaving the coarse or fine filaments, the third single layer mesh structure being overlaid with the first single layer mesh structure 20, or the third single layer mesh structure being overlaid with the second single layer mesh structure 30. The present application is not limited thereto and the second mesh structure may further include a fourth single layer structure formed by weaving the thick or thin wires to be overlapped with other single layer mesh structures of the second mesh structure, and the like.
The thick wires 1 and the thin wires 2 may be made of the same material, such as cobalt-chromium alloy, nickel-titanium alloy, tungsten wires, stainless steel wires, or the thick wires 1 and the thin wires 2 may be made of different materials, such as any one of cobalt-chromium alloy, nickel-titanium alloy, tungsten wires, stainless steel wires, and metal composite wires, respectively, or any one or several of the thick wires 1 and the thin wires 2 may be made of radiopaque developing wires, such as any one or several of platinum wires, platinum-tungsten wires, platinum-iridium wires, and the like.
With continued reference to fig. 2 and 3, in the present embodiment, the medical stent is formed by interweaving braided wires with opposite spirals, and each braided wire in the spiral direction includes the thick wires 1 and the thin wires 2.
Specifically, the medical stent is integrally formed by weaving a plurality of thick wires 1 and a plurality of thin wires 2, and each thick wire 1 and each thin wire 2 respectively extend in a spiral manner to form a spiral structure, so that the medical stent has a plurality of spiral structures with left-handed rotation and a plurality of spiral structures with right-handed rotation, and the spiral structures in the same spiral direction are not intersected with each other. Although "left and right" are described in a non-limiting manner, it should be understood that "left and right" are relative to the central axis of the helical structure being formed, and that left and right turns represent two helical directions that are opposite in direction of rotation relative to the central axis. In the same spiral direction, the number of the thick filaments 1 and the number of the thin filaments 2 of the first mesh structure 10 are in m: n are alternately arranged at intervals, wherein m and n are positive integers. In fig. 1 and 2, m is 1, n is 1, and it should be understood that m and n may take other values, and the value range of m: n may be 1:1 to 5:1, for example, m is 1,n is 2, or m is 2,n is 3, etc., which should not be construed as limiting the present application. When m: n =1, the contact of the first mesh structure 10 with the blood vessel wall is as shown in fig. 3a, when m: n = 1.
When the medical stent is integrally woven by forming the first mesh structure 10 by alternately arranging the thick filaments 1 and the thin filaments 2 in a spiral manner, a first single-layer mesh structure 20 formed by weaving thick filaments 1 in two different directions and a second single-layer mesh structure 30 formed by weaving thin filaments 2 in two different directions are formed in the second mesh structure portion.
Alternatively, as shown in fig. 2, a first single-layer mesh structure 20 formed by knitting the thick filaments 1 constitutes an inner layer of the second mesh structure, and a second single-layer mesh structure 30 formed by knitting the thin filaments 2 constitutes an outer layer of the second mesh structure, and further as shown in fig. 4a, the second mesh structure is in contact with the vessel wall 3 through the first single-layer mesh structure 20, that is, as shown in fig. 1, a second single-layer mesh structure 30 formed by knitting the thin filaments 2 constitutes an inner layer of the second mesh structure, and a first single-layer mesh structure 20 formed by knitting the thick filaments 1 constitutes an outer layer of the second mesh structure, and further as shown in fig. 4b, the second mesh structure is in contact with the vessel wall 3 through the second single-layer mesh structure 30. Wherein the second single layer mesh structure 30 has a mesh area of 0.01mm 2 ～0.64mm 2 And the plaque coverage rate is ensured to prevent thrombus from escaping, the mesh area of the first single-layer mesh structure 20 is more than 4 times that of the second single-layer mesh structure 30, and the adherence performance of the middle section 200 of the stent is ensured. In this embodiment, it is preferable that the number of the filaments 2 is greater than or equal to the number of the thick filaments 1 when the medical stent is formed, that is, the number of the filaments 2 is greater than that of the thick filaments 1 when viewed from the cross section of the medical stentOr equal to the number of the thick wires 1, and further preferably, the number of the thin wires 2 is greater than the number of the thick wires 1, so that the medical stent formed by weaving has a mesh area as small as possible while providing sufficient radial support force by the thick wires 1.
In this embodiment, it is preferable that the first mesh structure is a single-layer structure, and when the head section and the tail section of the medical stent are single-layer structures, assembly and delivery can be facilitated.
The first mesh structure 10, the first single-layer mesh structure 20, and the second single-layer mesh structure 30 may be plain weave or a variation of the plain weave, that is, woven wires in two directions at an angle to each other are woven in such a manner that 1-sinker 1 sinker, 2 sinker 1 sinker, 3 sinker 1 sinker, 2 sinker, 2 sinker 3 sinker, etc., as shown in fig. 5, to form each of the mesh structures. It should also be understood that fig. 5 only illustrates the knitting manner of each mesh structure knitting formation, and no distinction is made between the knitting yarn being the thick yarn 1 or the thin yarn 2.
In this embodiment, preferably, the head section 100 and/or the tail section 300 includes a flared section, the flared section is open away from the middle section 200, the flared section 101 is formed by braiding the thick filaments 1 in a first direction in an extending manner and then twisting the thick filaments 1 in a second direction, and the second direction is opposite to the first direction, that is, after each thick filament 1 first extends spirally in one direction to form a spiral structure, twisting the thick filaments 1 extends spirally in the opposite direction to form a spiral structure, so that two spiral structures with opposite spiral directions and opposite extending directions are formed by one thick filament 1.
Alternatively, in the present embodiment, as shown in fig. 6, the flaring segment only includes the first flaring structure 101 formed by knitting thick filaments in the first direction and then twisting the thick filaments in the second direction. The first flaring structure 101 formed by the circling of the thick wire 1 is utilized, so that the stent is not exposed from the thick wire 1, the blood vessel wall can be prevented from being damaged by the exposed thick wire 1, in addition, the stent can be more easily opened after the micro catheter is pushed out, and the anchoring capacity of the end part of the stent is improved. At this time, the filaments 2 forming the medical catheter may not be convolutely braided, that is, the ends of the filaments 2 are exposed, or, further preferably, as shown in fig. 7, the head section 100 and/or the tail section 300 includes a first flaring structure 101 formed by the coarse filaments extending along the first direction after braiding and convoluted to extend along the second direction and a second flaring structure 102 formed by the filaments extending along the first direction after braiding and convoluted to extend along the second direction, so that the stent is free from the exposure of the filaments 2. Although the damage of the exposed thin wire 2 to the vessel wall is greatly smaller than the damage of the exposed thick wire 1 to the vessel wall, the thin wire 2 also adopts the convolution design on the basis of the convolution design of the thick wire 1, so that the damage to the vessel wall can be reduced to the minimum.
Based on the above description, the medical stent provided by the embodiment of the present invention can have the following forms:
(1) The double-layer thick silk large mesh in the middle of the bracket is arranged in the inner layer, and only the head end of the bracket is provided with a thick silk back-knitting structure;
(2) The double-layer thick silk large mesh in the middle of the bracket is arranged in the inner layer, and only the head end is provided with a thick silk and thin silk back-knitting structure;
(3) The double-layer thick silk large mesh in the middle of the bracket is arranged in the inner layer, and the bracket with a thick silk back-knitting structure is arranged at the head end and the tail end of the bracket;
(4) The double-layer thick silk large mesh in the middle of the bracket is arranged in the inner layer, and the head end and the tail end of the bracket are provided with a thick silk back-knitting structure and a thin silk back-knitting structure;
(5) The double-layer thick wire big mesh in the middle of the bracket is arranged on the outer layer, and only the tail end of the bracket is provided with a thick wire back-woven structure;
(6) The double-layer thick silk large mesh in the middle of the bracket is arranged on the outer layer, and only the tail end of the bracket is provided with a thick silk back-knitting structure and a thin silk back-knitting structure;
(7) The double-layer thick silk large mesh in the middle of the bracket is arranged on the outer layer, and the head end and the tail end of the bracket are both provided with thick silk back-knitting structures;
(8) The double-layer thick silk large mesh in the middle of the bracket is arranged on the outer layer, and the far end and the near end of the bracket are provided with a thick silk back-knitting structure and a thin silk back-knitting structure.
In addition, in this embodiment, in order to make the stent easy to open after being pushed out of the microcatheter, the flaring angles of the first flaring structure 101 and the second flaring structure 102 relative to the axis of the middle section 200 are preferably the same, but in other embodiments, the flaring angles of the first flaring structure 101 and the second flaring structure may also be different. It is further preferred that the second flaring structure 102 be further from the intermediate section 200 than the first flaring structure 101, as shown in fig. 7, or, referring to fig. 9, that the second flaring structure 102 and the first flaring structure 101 be equidistant from the intermediate section 200. By the design, the end part of the medical stent is always provided with radial tension through the thick wire 1, so that the anchoring effect and the opening effect of the stent can be ensured.
In this embodiment, the flaring angles of the first flaring structure 101 and the second flaring structure 102 relative to the axis of the middle section 200 may range from 5 ° to 75 °, and in this range, the anchoring effect and the opening effect of the medical stent are optimal. The value range of the convolution angle theta formed by the convolution of the thick filaments and/or the thin filaments can be 10-150 degrees.
In addition, in this embodiment, the axial length of the middle section 200 accounts for 40% to 95% of the total length of the medical stent, the specific axial length of the middle section 200 may be set according to the length of a diseased blood vessel, and the length of the middle section 200 may be as close to the length of the diseased blood vessel as possible, so as to achieve a better plaque covering effect through the second single-layer mesh structure 30 of the middle section 200. Of course, when the length of the middle section 200 is smaller than the length of the lesion blood vessel, the first mesh structure 10 can also have a certain covering effect, and thus, the present application does not limit the length of the middle section 200 to be equal to the length of the lesion blood vessel.
[ example two ]
The present embodiment provides a medical stent, which has the same components as the medical stent provided in the first embodiment, that is, also includes a head section 100, a middle section 200 and a tail section 300 which are connected in sequence, and the head section 100 and the tail section 300 are a first mesh structure 10 formed by co-weaving the thick wires 1 and the thin wires 2, the middle section 200 is a second mesh structure formed by covering a first single-layer mesh structure 20 formed by weaving the thick wires 1 and a second single-layer mesh structure 30 formed by weaving the thin wires 2 with each other, and has the same performance as the medical stent provided in the first embodiment.
In contrast to the first embodiment, please refer to fig. 8 and 9, in the present embodiment, the medical stent is formed by interweaving twisting structures with opposite spiral directions, and each twisting structure is formed by mutually and rotatably interweaving the thick filaments 1 and/or the thin filaments 2. That is, the twisted structure may be a first twisted structure in which two thick filaments 1 are twisted and interwoven with each other, a second twisted structure in which two thin filaments 2 are twisted and interwoven with each other, or a third twisted structure in which one thick filament 1 and one thin filament 2 are twisted and interwoven with each other. When the medical stent comprises a first twisted structure formed by winding and interweaving two thick wires 1 and a second twisted structure formed by winding and interweaving two thin wires 2, the first twisted structure and the second twisted structure can be twisted in the same spiral direction according to the ratio of 1: 1. 1:2, etc. are arranged in turn and are not intersected with each other. When the medical stent comprises the first twisting structure, the second twisting structure and the third twisting structure, the first twisting structure, the second twisting structure and the third twisting structure can be twisted in a manner that the ratio of 1:1:1 are arranged in turn and are not intersected with each other.
Although only a few ways of forming the medical stent by using the respective twisting structures are illustrated above, the present application is not limited thereto, and the medical stent further includes other combination forms and arrangement forms of the first twisting structure, the second twisting structure and the third twisting structure, which only need to ensure that the combination forms and arrangement forms can provide sufficient radial supporting force, and after the integral knitting forming, the mesh area of the second single-layer mesh structure 30 of the middle section 200 is 0.01mm 2 ～0.64mm 2 And the plaque coverage rate is ensured to prevent thrombus from escaping.
In a preferred embodiment, the medical stent comprises only the third twist structure, that is, each twist structure of the medical stent comprises one thick wire 1 and one thin wire 2 which are intertwined and interwoven, so that the medical stent has uniform radial supporting force.
With continued reference to fig. 8, similar to the embodiment, in the present embodiment, the head section 100 and/or the tail section 300 has a flared section that is open away from the middle section 200, optionally, the flared section only includes a first flared structure 101, the first flared structure 101 is formed by braiding the thick filaments 1 in a first direction in an extending manner and then twisting the thick filaments to extend in a second direction, the second direction is opposite to the first direction, in the present embodiment, after each of the twisting structures first extends spirally in one direction to form a spiral structure, each of the twisting structures twists and extends spirally in an opposite direction to form a spiral structure, so that two spiral structures with opposite directions and extending directions are formed by one twisting structure.
Alternatively, and with further continued reference to fig. 9, similar to the embodiment wherein the flared section includes a first flared structure 101 and a second flared structure 102, the second flared structure 102 is formed by braiding the twist structure extending in the first direction to convolute to braid extending in the second direction. Therefore, the medical stent provided by the embodiment can also exist in 8 forms as described in the first embodiment.
For a description of the relative position relationship between the first flaring structure 101 and the second flaring structure 102, the flaring angles of the first flaring structure 101 and the second flaring structure 102, and the ratio of the axial length of the intermediate section 200 in the total length, reference is made to embodiment one, and details are not repeated here.
Fig. 10 illustrates a structure of the twisting structure, but the present application is not limited thereto, and any twisting method capable of winding and interweaving to form a twisting structure with interwoven rings and interwoven points is within the protection scope of the present application.
In summary, the present invention provides a medical stent, which is a tubular body integrally woven from thick filaments and thin filaments, and comprises a head section, a middle section and a tail section which are connected in sequence; wherein the head section and the tail section comprise a first mesh structure formed by co-weaving the thick filaments and the thin filaments; the intermediate section includes a second mesh structure formed by a first single layer of mesh structure formed by the coarse filament weave and a second single layer of mesh structure formed by the fine filament weave overlaying one another. Medical support's interlude covers the bilayer structure that forms each other for the first individual layer mesh structure of weaving by the thick silk and the second individual layer mesh structure of weaving by the filament, when utilizing first individual layer mesh structure to guarantee support interlude adherence performance, also protects the plaque coverage rate through second individual layer mesh structure and prevents the thrombus escape, just medical support is woven the shaping by thick silk and filament an organic whole, weaves and the simple high efficiency of assembly process.
It should be noted that, in this specification, each embodiment is described in a progressive manner, and the emphasis of each embodiment is to be described different from that of other embodiments, and the same and similar parts in each embodiment may be referred to each other, and in addition, different parts in each embodiment may also be used in combination with each other, which is not limited by the present invention.
It should be noted that the medical stent provided by the present invention may be used in carotid artery, and may also be applied to other desired sites, such as subclavian artery, vertebral artery ostium, intracranial vessel, peripheral vessel, coronary artery, etc., which is not limited in the present application.
It should be understood, however, that the intention is not to limit the invention to the particular embodiments described. It will be apparent to those skilled in the art that many changes and modifications can be made, or equivalents employed, to the presently disclosed embodiments without departing from the intended scope of the invention. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the protection scope of the technical solution of the present invention, unless the content of the technical solution of the present invention is departed from.
Claims (15)
1. A medical stent is characterized in that the medical stent is a tubular body formed by integrally weaving thick wires and thin wires, and comprises a head section, a middle section and a tail section which are sequentially connected; wherein,
the head section and the tail section comprise a first mesh structure formed by co-weaving the thick filaments and the thin filaments;
the middle section includes a second mesh structure including a first single layer of mesh structure formed by the coarse filament weave and a second single layer of mesh structure formed by the fine filament weave, the first and second single layer of mesh structures overlying one another.
2. The medical stent of claim 1, wherein said medical stent is interwoven from braided wires having opposite helical directions, said braided wires in each helical direction comprising said heavy filaments and said thin filaments.
3. The medical stent of claim 2, wherein the number of said coarse filaments and the number of said fine filaments of said first mesh structure are in a ratio of m: n are alternately arranged at intervals, wherein m and n are positive integers.
4. The medical stent of claim 1, wherein the number of filaments in the medical stent is greater than or equal to the number of thick filaments.
5. The medical stent of claim 1, wherein said medical stent comprises oppositely spiraled kinked structures, each of said kinked structures being formed by intertwining and interweaving said thick and/or thin filaments.
6. The medical stent of claim 5, wherein each of said intertwining structures comprises one of said thick filaments and one of said thin filaments intertwined and interwoven.
7. The medical stent of claim 1, wherein the head section and/or the tail section comprises a flared section that flares gradually outward in a direction away from the middle section, the flared section being formed by extending the heavy and/or thin filaments in a first direction and then back braiding in a second direction, the second direction being opposite the first direction.
8. The medical stent of claim 7, wherein the flared section has a flare angle of 5 ° to 75 ° relative to the axis of the intermediate section.
9. The medical stent of claim 7, wherein the flared section includes a first flared structure formed by the coarse filaments extending past the braid in a first direction and twisting the braid extending in a second direction and a second flared structure formed by the fine filaments extending past the braid in the first direction and twisting the braid extending in the second direction.
10. The medical stent of claim 9, wherein the first flaring structure is further from the intermediate section than the second flaring structure, or wherein the second flaring structure and the first flaring structure are equidistant from the intermediate section.
11. The medical stent of claim 9, wherein the first and second flaring structures have the same flaring angle relative to the axis of the mid-section.
12. The medical stent of claim 1, wherein the axial length of the intermediate section is between 40% and 95% of the total length of the medical stent.
13. The medical stent of claim 1, wherein the third single layer mesh structure has a mesh area of 0.01mm 2 ～1mm 2 The mesh area of the second single-layer mesh structure is that of the third single-layer mesh structureMore than 4 times of the mesh area.
14. The medical stent of claim 1, wherein said second mesh structure further comprises a third single layer mesh structure woven from said coarse or fine filaments, said third single layer mesh structure overlaying said first single layer mesh structure, or said third single layer mesh structure overlaying said second single layer mesh structure.
15. The medical stent of claim 1, wherein said first mesh structure is a single layer structure.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110939150.9A CN115702842A (en) | 2021-08-16 | 2021-08-16 | Medical support |
| PCT/CN2022/111601 WO2023020353A1 (en) | 2021-08-16 | 2022-08-11 | Medical stent |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110939150.9A CN115702842A (en) | 2021-08-16 | 2021-08-16 | Medical support |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115702842A true CN115702842A (en) | 2023-02-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110939150.9A Pending CN115702842A (en) | 2021-08-16 | 2021-08-16 | Medical support |
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| Country | Link |
|---|---|
| CN (1) | CN115702842A (en) |
| WO (1) | WO2023020353A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116327461A (en) * | 2023-03-23 | 2023-06-27 | 上海励楷科技有限公司 | Double-layer braided support |
| CN116570409A (en) * | 2023-05-06 | 2023-08-11 | 上海励楷科技有限公司 | Double-layer spring bracket |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040176658A1 (en) * | 2003-03-03 | 2004-09-09 | Mcmurray Brian | Warp knit fabrics useful for medical articles and methods of making same |
| CN203059974U (en) * | 2013-01-24 | 2013-07-17 | 威海维心医疗设备有限公司 | Intracranial self-expandable segmentally-covered braided stent |
| CN107427377B (en) * | 2015-01-12 | 2019-09-03 | 微仙美国有限公司 | Bracket |
| CN212326686U (en) * | 2020-04-16 | 2021-01-12 | 四川大学华西医院 | Intravascular multilayer bare stent system |
| CN212940080U (en) * | 2020-07-06 | 2021-04-13 | 丁剑 | Axially compressible and stretchable bare stent |
| CN112386364A (en) * | 2020-11-10 | 2021-02-23 | 苏州中天医疗器械科技有限公司 | Hybrid braided stent |
-
2021
- 2021-08-16 CN CN202110939150.9A patent/CN115702842A/en active Pending
-
2022
- 2022-08-11 WO PCT/CN2022/111601 patent/WO2023020353A1/en active Application Filing
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116327461A (en) * | 2023-03-23 | 2023-06-27 | 上海励楷科技有限公司 | Double-layer braided support |
| CN116570409A (en) * | 2023-05-06 | 2023-08-11 | 上海励楷科技有限公司 | Double-layer spring bracket |
| CN116570409B (en) * | 2023-05-06 | 2024-01-26 | 上海励楷科技有限公司 | Double-layer spring bracket |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2023020353A1 (en) | 2023-02-23 |
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