CN114521995A - Artery stent - Google Patents

Artery stent Download PDF

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Publication number
CN114521995A
CN114521995A CN202210056324.1A CN202210056324A CN114521995A CN 114521995 A CN114521995 A CN 114521995A CN 202210056324 A CN202210056324 A CN 202210056324A CN 114521995 A CN114521995 A CN 114521995A
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Prior art keywords
stent
fixed
arterial
blood vessel
cylindrical
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CN202210056324.1A
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Chinese (zh)
Inventor
黄红
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Zhuzhou Maowu Medical Technology Co ltd
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Zhuzhou Maowu Medical Technology Co ltd
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Priority to CN202210056324.1A priority Critical patent/CN114521995A/en
Publication of CN114521995A publication Critical patent/CN114521995A/en
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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
    • A61F2/02—Prostheses implantable into the body
    • A61F2/04—Hollow or tubular parts of organs, e.g. bladders, tracheae, bronchi or bile ducts
    • A61F2/06—Blood vessels
    • A61F2/07—Stent-grafts
    • 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
    • A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0063—Three-dimensional shapes
    • A61F2230/0065—Three-dimensional shapes toroidal, e.g. ring-shaped, doughnut-shaped

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  • Health & Medical Sciences (AREA)
  • Gastroenterology & Hepatology (AREA)
  • Pulmonology (AREA)
  • Cardiology (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Transplantation (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (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)
  • Prostheses (AREA)

Abstract

The invention discloses an arterial stent, which comprises a stent body and a covering film, wherein the covering film covers the stent body to form a film, the stent body comprises a cylindrical stent and a fixed stent, the end part of the cylindrical stent is connected with the fixed stent, in the technical scheme of the invention, the fixed stent bent towards the outer side of the cylindrical stent is used for strengthening the stress between the fixed stent and a blood vessel, and simultaneously, the connection surface of the blood vessel and the fixed stent is bent by using the elasticity of the blood vessel through the relative reverse bending of each circle of the fixed stent, so that the connection area between the blood vessel and the stent is strengthened, and the generation of gaps is reduced, thereby preventing the problem that the gaps between the covering stent and the blood vessel are difficult to be sealed under the impact of blood flow of the existing covering stent, and the blood flow continuously impacts a middle film and an outer mold, so that the healing of the blood vessel is slow.

Description

Artery stent
Technical Field
The invention relates to the technical field of arterial stents, in particular to an arterial stent.
Background
The normal human artery blood vessel is composed of 3 layers of structures, wherein the 3 layers of structures are tightly attached to bear the passing of blood flow, and the artery interlayer means that the intima is gradually peeled and expanded to form a true cavity and a false cavity in the artery due to the strong blood impact caused by the local tearing of the intima. Resulting in some of the columns including signs of laceration-like pain. The aorta is the main vessel of the body, which is subject to the pressure directly from the beating of the heart, with a large blood flow, tearing of the intima layer, a very high chance of rupture and a very high mortality rate if not treated properly and timely. According to the position of the lacerated part and the artery, the dissection can affect all parts of the whole body, the most common and most dangerous is the aortic dissection, and other superior mesenteric artery dissection, carotid artery dissection and the like, and the expression forms are different due to different blood supply parts. The aortic dissection is a critical disease, and the main method for treating the aortic dissection at present is to place a covered stent through an interventional operation, wherein the covered stent extrudes an inner membrane of a blood vessel back to the blood vessel to prevent blood flow from continuously impacting a tunica media and an outer membrane, but the gap between the covered stent and the blood vessel is difficult to seal under the impact of the blood flow by the existing covered stent, so that the blood flow continuously impacts the tunica media and an outer membrane, and the blood vessel is slowly healed.
Disclosure of Invention
The invention mainly aims to provide an arterial stent, and aims to solve the problem that a gap between a covered stent and a blood vessel is difficult to seal under the impact of blood flow in the conventional covered stent.
In order to achieve the purpose, the artery stent provided by the invention comprises a stent body and a covering membrane, wherein the covering membrane covers the stent body to form a thin film, the stent body comprises a cylindrical stent and a fixed stent, and the end part of the cylindrical stent is connected with the fixed stent; the axial line space coordinate expression of the fixed support is as follows:
Figure DEST_PATH_IMAGE001
；
in the formula:
Figure 481806DEST_PATH_IMAGE002
an x-axis coordinate of the fixed support representing the length t;
Figure DEST_PATH_IMAGE003
the y-axis coordinate of the fixed support representing the length t,
Figure 6590DEST_PATH_IMAGE004
a z-axis coordinate of the fixed support representing the t-length; a represents the minimum diameter of the fixed stent; b represents the bending amplitude of the fixed bracket; t represents the length of the fixed stent; m represents the number of dance music of each circle of the fixed support; n represents the z-axis rate of change of the fixation stent with change in length;
Figure DEST_PATH_IMAGE005
indicating the length of the fixation bracket.
Preferably, the fixing support comprises a bare support which is not covered by a film, and the bare support is arranged on one side of the fixing support far away from the cylindrical support.
Preferably, the covering film is made of polytetrafluoroethylene material, dacron, polyester or polyurethane.
Preferably, the fixing bracket and the cylinder bracket are made of a connecting wire having a memory function.
Preferably, the fixing stent and the cylindrical stent are made of nitinol wires.
Preferably, the diameter of the connecting wire of the fixing bracket ranges from 0.01mm to 1 mm.
Preferably, the bending amplitude B of the fixing support is less than half of the minimum diameter a of the fixing support.
Preferably, the outer side of the coating is provided with a drug coating.
According to the technical scheme, the stress between the fixed support and the blood vessel is enhanced through the fixed support bent towards the outer side of the cylindrical support, meanwhile, the connection surface between the blood vessel and the fixed support is bent through each circle of the fixed support which is bent oppositely, the elasticity of the blood vessel is utilized, the connection area between the blood vessel and the fixed support is enhanced, and the generation of gaps is reduced, so that the problem that the gaps between the covered support and the blood vessel are difficult to seal under the impact of blood flow, the blood flow continuously impacts a middle film and an outer film, and the blood vessel is slowly healed is solved.
Drawings
In order to more clearly illustrate the embodiments or technical solutions of the present invention, the drawings used in the embodiments or technical solutions of the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic perspective view of an arterial stent of the present invention.
Fig. 2 is a schematic axial view of the arterial stent of the present invention.
The reference numbers illustrate:
reference numerals Name (R) Reference numerals Name (R) Reference numerals Name (R)
1 Support body 2 Cylinder support 3 Fixing support
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In addition, the technical solutions in the embodiments of the present invention may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination of technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
Referring to fig. 1 and 2, the present invention provides an arterial stent, including a stent body 1 and a covering membrane, wherein the covering membrane covers the stent body 1 to form a thin film, the stent body 1 includes a cylindrical stent 2 and a fixed stent 3, and an end of the cylindrical stent 2 is connected to the fixed stent 3; the expression of the axial space coordinate of the fixed bracket 3 is as follows:
Figure 717057DEST_PATH_IMAGE001
；
in the formula:
Figure 320077DEST_PATH_IMAGE002
x-axis coordinates of the fixed support 3 representing the t-angle;
Figure 229127DEST_PATH_IMAGE003
the y-axis coordinate of the fixed support 3 representing the angle t,
Figure 767556DEST_PATH_IMAGE004
z-axis coordinates of the fixed support 3 representing the t-angle; a represents the minimum diameter of the fixed bracket 3; b represents the bending amplitude of the fixed bracket 3; t represents the angle of the fixed bracket 3; m represents the number of times each turn of the fixing bracket 3 is bent; n represents the z-axis rate of change of the fixed support 3 with change in length;
Figure 762057DEST_PATH_IMAGE005
indicating the maximum angle of the fixed bracket 3.
In the technical scheme of the invention, the fixed support 3 bent towards the outer side of the cylindrical support 2 is used for strengthening the stress between the fixed support 3 and the blood vessel, and simultaneously, each circle of the fixed support 3 is bent oppositely, the elasticity of the blood vessel is utilized to bend the connection surface of the blood vessel and the fixed support 3, so that the connection area between the blood vessel and the support is strengthened, and the generation of gaps is reduced, thereby preventing the problem that the gaps between the covered support and the blood vessel are difficult to seal under the impact of blood flow in the existing covered support, leading the blood flow to continuously impact the tunica media and the outer mold, and leading the healing of the blood vessel to be slow.
Specifically, the parameters A, B, M, F and N need to be determined according to the position of a blood vessel, the angle of the blood vessel, the disease condition and the pathology, the larger the M value is, the fewer the times of bending each circle of the fixing support 3 is, the larger the F value is, the longer the length of the fixing support 3 is, the larger the N value is, and the farther the distance between each circle of the fixing support is.
Specifically, the value range of A is 2mm-7mm, and the value range of B is 0.2mm-1.5 mm.
In one embodiment of the present invention, a value of a is 2, a value of B is 0.2, a value of M is 1, and a value of F is 4, so that the minimum diameter of the fixing bracket 3 is 2mm, the maximum diameter is 2.4mm, and the number of times of bending per turn of the fixing bracket 3 is 2.
In one embodiment of the present invention, a value of a is 2, a value of B is 0.2, a value of M is 2, and a value of F is 4, so that the minimum diameter of the fixing bracket 3 is 2mm, the maximum diameter is 2.4mm, and the number of times of bending per turn of the fixing bracket 3 is 1.
In one embodiment of the present invention, a value of a is 7, a value of B is 1.5, a value of M is 2, and a value of F is 4, then a minimum diameter of the fixing bracket 3 is 7mm, a maximum diameter of the fixing bracket 3 is 10mm, and the number of times of bending per turn of the fixing bracket 3 is 1.
In one embodiment of the present invention, a is 5, B is.0.5, M is 2, and F is 4, so that the minimum diameter of the fixing bracket 3 is 2mm, the maximum diameter is 2.4mm, and the number of bending times per turn of the fixing bracket 3 is 1.
In one embodiment of the present invention, a value of a is 7, a value of B is 1.5, a value of M is 2, and a value of F is 4, so that the minimum diameter of the fixing bracket 3 is 5mm, the maximum diameter is 6mm, and the number of times of bending per turn of the fixing bracket 3 is 1.
In another embodiment of the present invention, the fixing bracket 3 includes a bare bracket that is not covered by a film, and the bare bracket is disposed on a side of the fixing bracket 3 away from the cylindrical bracket 2.
Specifically, the part is a bare stent, and the bare stent part is fused by the blood vessel first, so that the connection between the stent and the blood vessel is enhanced, and the fixed stent 3 is prevented from moving.
In yet another embodiment of the present invention, the coating film is made of a polytetrafluoroethylene material, dacron, polyester, or polyurethane.
In still another embodiment of the present invention, the fixing bracket 3 and the cylindrical bracket 2 are made of a connecting wire having a memory function. The fixed support 3 and the cylindrical support 2 are made of nickel-titanium alloy wires.
Specifically, the connecting wire with the memory function such as nickel-titanium alloy is used, so that the stent can be implanted into the blood vessel through an interventional operation.
In still another embodiment of the present invention, the diameter of the connecting wire of the fixing bracket 3 ranges from 0.01mm to 1 mm.
Specifically, the diameter of the cart using the connecting wire is determined according to the position of the fixing bracket 3.
In a further embodiment of the invention, the bending width B of the fixing support 3 is less than half the minimum diameter a of the fixing support 3.
Specifically, the fixing bracket 3 is easily deformed when the bending width B is too large.
In yet another embodiment of the present invention, the coating is provided with a drug coating on the outside.
Specifically, a drug coating layer is arranged, and drugs on the outer side of the coating slowly enter blood vessels to play a drug administration role.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (8)

1. An arterial stent is characterized by comprising a stent body and a covering membrane, wherein the covering membrane covers the stent body to form a thin film, the stent body comprises a cylindrical stent and a fixed stent, and the end part of the cylindrical stent is connected with the fixed stent; the axial line space coordinate expression of the fixed support is as follows:
Figure 568234DEST_PATH_IMAGE001
；
in the formula:
Figure 440375DEST_PATH_IMAGE002
an x-axis coordinate of the fixed support representing the length t;
Figure 699318DEST_PATH_IMAGE003
the y-axis coordinate of the fixed support representing the length t,
Figure 781544DEST_PATH_IMAGE004
a z-axis coordinate of the fixed support representing the t-length; a represents the minimum diameter of the fixed stent; b represents the bending amplitude of the fixed bracket; t represents the length of the fixed stent; m represents the number of dance music of each circle of the fixed support; n represents the z-axis rate of change of the fixation stent with change in length;
Figure 784135DEST_PATH_IMAGE005
indicating the length of the fixation bracket.
2. The arterial stent according to claim 1, wherein said fixed stent comprises a bare stent not covered by a coating, said bare stent being disposed on a side of said fixed stent remote from said cylindrical stent.
3. The arterial stent according to claim 1, wherein said cover is made of polytetrafluoroethylene, dacron, polyester or polyurethane.
4. The arterial stent according to claim 1, wherein said fixing stent and said cylindrical stent are made of connecting wire having a memory function.
5. The arterial stent of claim 4, wherein said fixed stent and said cylindrical stent are made of nitinol wire.
6. The arterial stent of claim 1, wherein said anchoring stent has a connecting wire diameter in the range of 0.01mm to 1 mm.
7. The arterial stent of claim 1, wherein said fixed stent has a bending amplitude less than one-half of its minimum diameter.
8. The arterial stent according to any one of claims 1 to 7, wherein the outside of said cover is provided with a drug coating.
CN202210056324.1A 2022-01-18 2022-01-18 Artery stent Pending CN114521995A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210056324.1A CN114521995A (en) 2022-01-18 2022-01-18 Artery stent

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210056324.1A CN114521995A (en) 2022-01-18 2022-01-18 Artery stent

Publications (1)

Publication Number Publication Date
CN114521995A true CN114521995A (en) 2022-05-24

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210056324.1A Pending CN114521995A (en) 2022-01-18 2022-01-18 Artery stent

Country Status (1)

Country Link
CN (1) CN114521995A (en)

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