Novel peripheral vascular stent

Abstract

The novel peripheral vascular stent comprises a plurality of layers of supporting parts, a plurality of evenly-distributed connecting parts are arranged between every two adjacent supporting parts, the two ends of each connecting part are rotationally connected with the supporting parts at the same time, medicine grooves are formed in the outer walls of the supporting parts, medicine layers are arranged in the medicine grooves, and polymer coatings are arranged on the upper surfaces of the medicine grooves. The supporting part is provided with the medicine groove used for carrying medicine, the medicine carrying capacity of the stent is increased, release of the medicine is limited through the polymer coating, the medicine release period is prolonged, and blood vessel restenosis can be better prevented; the adjacent supporting parts are connected through the connecting parts, the rotatable design of the connecting parts can facilitate bending of the stent, and drug release caused by breakage of the polymer coating due to bending of the stent in the implanting process is prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a novel peripheral vascular stent. Background Art

[0002] Peripheral blood vessels refer to blood vessels other than cardiovascular and cerebrovascular vessels, including arteries of the limbs, head and neck, and trunk. Peripheral blood vessels are more widely distributed, more numerous and longer, and more susceptible to disease. Atherosclerotic narrowing or blockage of peripheral blood vessels often leads to peripheral vascular disease. The most important point in treating peripheral vascular disease is to improve blood flow. The methods are divided into medical treatment and surgical treatment. Medical treatment includes antihypertensive, lipid-lowering, antiplatelet aggregation and other treatments. Surgical treatment is further divided into open surgery and intravascular interventional treatment. Interventional treatment is a method of puncturing surface blood vessels, inserting a vascular catheter under continuous digital subtraction projection, and using specific vascular catheter operation techniques to diagnose and treat vascular diseases. Vascular stent implantation is based on the expansion of the luminal balloon. A stent is implanted in the diseased segment to support the narrowed and occluded segment of the blood vessel, reduce the elastic retraction and reshaping of the blood vessel, maintain the smooth blood flow in the luminal cavity, and prevent restenosis. Existing vascular stents are mainly divided into bare metal stents, covered stents, drug-coated stents and biodegradable stents. Each of the above stents has its own advantages and disadvantages. Different stents are often selected for treatment in clinical diagnosis. Among them, drug-coated stents are coated with drugs that inhibit cell proliferation on the stent so that the drugs can be slowly released about 1 to 3 months after the stent is implanted, thereby maintaining the patency of the stent and avoiding restenosis.

[0003] Since vascular stents are implanted into the human body through an external incision in the blood vessel (usually on the femoral artery or radial artery) and then delivered to the lesion site, very high requirements are placed on the compressibility and flexibility of the vascular stent. During implantation, the coating of drug-coated stents is prone to rupture and fall off during the bending of the blood vessel, which leads to accelerated drug release. At the same time, drug-coated stents have a small drug loading capacity and a short drug release cycle, and cannot inhibit cell proliferation for a long time, which increases the probability of restenosis of the blood vessel. Utility Model Content

[0004] The utility model aims to solve the above technical problems and provides a novel peripheral vascular stent.

[0005] In order to solve the above technical problems, the technical solution provided by the utility model is:

[0006] A novel peripheral vascular stent comprises a multi-layer support portion, wherein a plurality of evenly distributed connecting portions are arranged between two adjacent support portions, wherein both ends of the connecting portion are simultaneously rotatably connected to the support portion, a drug groove is arranged on the outer wall of the support portion, a drug layer is arranged inside the drug groove, and a polymer coating is arranged on the upper surface of the drug groove.

[0007] As an improvement, the support portion is in a wave-ring shape as a whole, the wave crests and wave troughs of two adjacent support portions are adjacent to each other, and elastic connecting parts are provided at the wave crests and wave troughs of the support portion, and the connecting parts are rotatably connected to the support portions.

[0008] As an improvement, the connecting piece is in the shape of "Ω", and the connecting piece is integrally connected to the supporting part.

[0009] As an improvement, a connecting piece connected to the connecting portion is provided with a connecting column, the end of the connecting column away from the connecting piece is spherical with a larger outer diameter than the other end, and circular grooves are provided at both ends of the connecting portion to accommodate the connecting column.

[0010] As an improvement, the wall thickness of the support part is between 0.05mm-0.2mm, the diameter of the support part after expansion is between 2mm-5mm, the height of the support part after expansion is between 0.25mm-1.5mm, the outer diameter of the end of the connecting column close to the connecting piece is the same as the wall thickness of the support part, and the outer diameter of the spherical end of the connecting column is 1.2 times the outer diameter of the end of the connecting column close to the connecting piece.

[0011] As an improvement, the drug layer is composed of one of rapamycin and paclitaxel.

[0012] The advantages of the utility model compared with the prior art are:

[0013] 2. The support part is provided with a drug groove for loading drugs, which increases the drug loading capacity of the stent, and limits the release of drugs through the polymer coating, which increases the drug release cycle and can better prevent vascular restenosis;

[0014] Adjacent supporting parts are connected by connecting parts. The rotatable design of the connecting parts can facilitate the bending of the stent and prevent the polymer coating from rupturing due to bending during the implantation of the stent, which may lead to drug release. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The utility model is a structural schematic diagram of a novel peripheral vascular stent.

[0016] Figure 2 The utility model discloses a connection diagram of a connector and a connection part of a novel peripheral vascular stent.

[0017] Figure 3 The utility model is a novel peripheral vascular stent Figure 2 Section view.

[0018] Figure 4 It is a partial cutaway schematic diagram of a support portion of a novel peripheral vascular stent of the utility model.

[0019] Figure 5 The utility model is a novel peripheral vascular stent Figure 4 A magnified schematic diagram of area A in the middle.

[0020] As shown in the figure: 1. Support part; 11. Drug groove; 12. Connector; 13. Connecting column; 2. Connecting part; 21. Circular groove; 3. Drug layer; 4. Polymer coating. DETAILED DESCRIPTION

[0021] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0022] See attached Figure 1-5 A novel peripheral vascular stent comprises a multilayer support portion 1, three evenly distributed connecting portions 2 are arranged between two adjacent support portions 1, both ends of the connecting portion 2 are simultaneously rotatably connected to the support portion 1, a drug groove 11 is arranged on the outer wall of the support portion 1, a drug layer 3 is arranged inside the drug groove 11, the drug groove 11 can accommodate more drugs and prolong the drug release cycle, the drug layer 3 is a mixture of rapamycin and paclitaxel in a ratio of 4:6, which can prevent vascular restenosis and other tissue hyperplasia, a polymer coating 4 is arranged on the upper surface of the drug groove 11, and the polymer coating 4 is composed of one of polylactic acid, glycolic acid, polylactic acid-glycolic acid copolymer, and difatty acid-sebacate copolymer, and the polymer coating 4 can slow down the release time of the drug on the drug layer 3.

[0023] The support portion 1 is in a wave-ring shape as a whole, and the crests and troughs of two adjacent support portions 1 are adjacent to each other. An elastic connecting member 12 is provided at the crests and troughs of the support portion 1. The connecting member 12 is in the shape of "Ω". The connecting member 12 is integrally connected to the support portion 1, and the support portion 1 can achieve contraction and expansion through the connecting member 12.

[0024] The connecting part 2 is rotatably connected to the connecting piece 12, and a connecting column 13 is provided on the connecting piece 12 connected to the connecting part 2. The connecting column 13 is spherical at one end away from the connecting piece 12, and circular grooves 21 for accommodating the connecting column 13 are provided at both ends of the connecting part 2. The shape of the circular groove 21 matches the connecting column 13, and the circular groove 21 and the connecting column 13 are clearance-matched. The connecting part 2 rotates through the circular groove 21, and its structure is similar to a ball joint. This matching method is conducive to the bending and advancement of the stent during the implantation process.

[0025] The wall thickness of the support part 1 is 0.1mm, the diameter of the support part 1 after expansion is between 3.6mm-4mm, the height of the support part 1 after expansion is between 0.5mm-0.75mm, the outer diameter of one end of the connecting column 13 close to the connecting piece 12 is the same as the wall thickness of the support part 1, and the outer diameter of the spherical end of the connecting column 13 is 1.2mm.

[0026] The working principle of this utility model:

[0027] When the stent is implanted, it bends along the blood vessel during transportation, and the connection portion 2 of the rotating connection connector 12 can increase the flexibility of the stent, thereby preventing the polymer coating 4 from rupturing due to bending during transportation; the drug layer 3 is located inside the drug groove 11, and the polymer coating 4 covers the drug layer 3, so that the drug inside the drug layer 3 can be slowly released onto the blood vessel wall, and the drug groove 11 ensures that the stent can accommodate more drugs, thereby increasing the release cycle of the drug layer 3, and having a better effect of preventing restenosis of the blood vessel and inhibiting cell proliferation.

[0028] The above description of the utility model and its implementation methods is not restrictive. The drawings show only one implementation method of the utility model, and the actual structure is not limited thereto. In short, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the invention of the utility model, they should all fall within the protection scope of the utility model.

Claims

1. A novel peripheral vascular stent, comprising a multi-layer support portion (1), characterized in that: A plurality of evenly distributed connecting parts (2) are provided between two adjacent supporting parts (1), and both ends of the connecting parts (2) are simultaneously rotatably connected to the supporting parts (1). A drug groove (11) is provided on the outer wall of the supporting part (1), a drug layer (3) is provided inside the drug groove (11), and a polymer coating (4) is provided on the upper surface of the drug groove (11).

2. A novel peripheral vascular stent according to claim 1, characterized in that: The support portion (1) is in the shape of a wave ring as a whole, the wave crests and wave troughs of two adjacent support portions (1) are adjacent to each other, elastic connecting members (12) are provided at the wave crests and wave troughs of the support portion (1), and the connecting portion (2) is rotatably connected to the connecting member (12).

3. A novel peripheral vascular stent according to claim 2, characterized in that: The connecting member (12) is in the shape of an Ω, and the connecting member (12) is integrally connected to the supporting portion (1).

4. A novel peripheral vascular stent according to claim 2, characterized in that: A connecting piece (12) connected to the connecting portion (2) is provided with a connecting column (13); one end of the connecting column (13) away from the connecting piece (12) is spherical with a larger outer diameter than the other end; and circular grooves (21) capable of accommodating the connecting column (13) are provided at both ends of the connecting portion (2).

5. A novel peripheral vascular stent according to claim 4, characterized in that: The wall thickness of the support portion (1) is between 0.05 mm and 0.2 mm, the diameter of the support portion (1) after expansion is between 2 mm and 5 mm, the height of the support portion (1) after expansion is between 0.25 mm and 1.5 mm, the outer diameter of one end of the connecting column (13) close to the connecting piece (12) is the same as the wall thickness of the support portion (1), and the outer diameter of one end of the spherical connecting column (13) is 1.2 times the outer diameter of one end of the connecting column (13) close to the connecting piece (12).

6. A novel peripheral vascular stent according to claim 1, characterized in that: The drug layer (3) is composed of one of rapamycin and paclitaxel.

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