Drug eluting coronary stent

Abstract

The present invention relates to the technical field of coronary stents, and specifically to a drug eluting coronary stent, comprising a main stent assembly and a release stent wire, wherein the main stent assembly comprises a main body ring frame mounted on both sides of the release stent wire, a plurality of compression assemblies are arranged inside the main body ring frame, and the compression assemblies comprise a plurality of limiting disks fixedly arranged in an annular manner inside the main body ring frame, a plurality of the limiting disks are interspersed and slidably arranged with pushers in the middle, the pushers are located on a side away from each two limiting disks and are fixedly sleeved with compression disks, the outer surface of the pushers is sleeved with springs used in conjunction with the limiting disks, the outer walls between each two release stent wires are connected with a supporting assembly, which is beneficial to preventing vascular plaques from eroding and covering the stent, and can quantitatively release the amount of drugs according to the expansion of the plaques, timely treat the plaques, avoid the limitations of carrying drugs, and improve the utilization efficiency of the stents.

Description

Technical Field

[0001] The invention relates to the technical field of coronary stents, in particular to a drug eluting coronary stent. Background Art

[0002] Heart stents, also known as coronary artery stents, are commonly used medical devices in cardiac interventional surgery and have the function of clearing arterial blood vessels. The main materials are stainless steel, nickel-titanium alloy or cobalt-chromium alloy. According to the different designs of the stents, they can be divided into mesh stents, tubular stents, winding stents, and ring stents.

[0003] In actual applications, existing drug-eluting coronary stents are generally coated with polymer drugs by coronary stents, which are implanted in the diseased part of the blood vessels in the human body, expanded by balloons, and released to the cardiovascular wall tissue in a controlled manner through elution to exert biological effects. There are some problems with this method of drug administration: after the stent is implanted, after being placed in the diseased part for a long time, the vascular plaque may recur due to vascular deposition and blockage after the stent is implanted, causing the blood vessel to block and squeeze the stent. The diseased plaque will cover the stent, affecting the patency of the blood vessel and causing vascular stenosis again. The drug carried during implantation can only last for a period of time. The subsequent stent can only maintain the function of supporting the blood vessel wall. It cannot automatically control the release of drugs according to the enlargement of the vascular plaque or the blockage of the blood vessel. It is also inconvenient to carry the drug again, which reduces the problem of vascular dilation and treatment effect.

[0004] In view of this, the present invention proposes a drug eluting coronary stent to solve the above problems. Summary of the invention

[0005] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0006] The present invention provides a drug eluting coronary stent, and the specific scheme is as follows:

[0007] A drug eluting coronary stent, comprising a main stent assembly and a release stent wire, wherein the main stent assembly comprises a main body ring frame mounted on both sides of the release stent wire, wherein a plurality of compression assemblies are arranged inside the main body ring frame, wherein the compression assemblies comprise a plurality of restriction disks fixedly arranged in an annular manner inside the main body ring frame, wherein pushers are inserted and slidably arranged in the middle of the plurality of restriction disks, wherein the pushers are located on a side away from each two restriction disks and are fixedly sleeved with a compression disk, wherein the outer surface of the pushers is sleeved with a spring used in conjunction with the restriction disks, and a support assembly is connected to the outer wall between each two release stent wires;

[0008] The support assembly includes an outer lining bag connected to the inner wall of the release bracket wire, a main control belt is arranged on the inner side of the outer lining bag, a through hole is opened at the connection between the outer wall of the main ring frame and the release bracket wire and on the inner side of the outer lining bag, the main control belt and the through hole are movably arranged to be interlaced, a main control linkage assembly is installed inside the main ring frame, an inner release layer is arranged inside the release bracket wire, and a plurality of drug delivery chambers are arranged inside the main ring frame.

[0009] As a preferred solution of the drug-eluting coronary stent described in the present invention, the main control linkage assembly includes a plurality of linkage rollers installed in a circular shape inside the main ring frame, the main control belt is connected to the linkage rollers, and both ends of the linkage rollers are fixedly connected with transfer assemblies.

[0010] As a preferred solution of the drug-eluting coronary stent of the present invention, the transfer assembly includes a transfer disk fixedly connected to both ends of the linkage roller, and a transfer rod fixedly connected to one end away from the two transfer disks.

[0011] As a preferred solution of the drug-eluting coronary stent described in the present invention, each of the two rotating disks is movably sleeved with an irregular cylinder at one end away from the other, the rotating rod is slidably matched with the irregular cylinder, the irregular cylinder is interspersed with the pusher, and the irregular cylinder is used in conjunction with a spring.

[0012] As a preferred embodiment of the drug-eluting coronary stent of the present invention, release plugs are installed through the outer wall of the main ring frame, and the release plugs pass through the main ring frame and extend to the inside of the release stent wire to communicate with the inner release layer.

[0013] As a preferred solution of the drug-eluting coronary stent of the present invention, a plurality of elastic threads are longitudinally arranged inside the outer lining bag, and the elastic threads are overlapped and interspersed with the main control belt.

[0014] As a preferred embodiment of the drug-eluting coronary stent of the present invention, the support assembly includes a plurality of inner lining sheets fixedly connected between every two of the main body ring frames, and the plurality of inner lining sheets are installed on the inner side of the main body ring frames and used in conjunction with the outer lining bag.

[0015] As a preferred embodiment of the drug-eluting coronary stent of the present invention, a plurality of drug-introducing plugs are annularly inserted and installed on the outer wall of one of the main ring frames, and the drug-introducing plugs are respectively connected to the drug-delivery chamber, and telescopic holes are arranged on the inner side of the drug-introducing plugs.

[0016] The beneficial effects of the present invention are:

[0017] In the present invention, the plaque squeezes the outer lining bag to push the elastic wire to deform. After the main control belt is pulled, the linkage roller rotates to drive the transfer disk, thereby rotating the transfer rod. One of the transfer rods slides on the surface of the irregular cylinder, thereby pushing the irregular cylinder to slide in the main ring frame to squeeze the spring. The pusher drives the compression disk to slide, and the pressure in the drug delivery chamber increases, pushing the drug from the release plug into the release stent wire, which is beneficial to the elution and release of the drug in the inner membrane of the coronary stent. According to the expansion of the plaque in the lesion site, the amount of drug can be quantitatively released to prevent the stent from being covered and the blood vessel from being blocked and narrowed, thereby ensuring the smooth flow of the blood vessel.

[0018] In the present invention, after the plaque at the lesion site expands, the inner lining sheet is set up, and as the stent wire is released and the outer lining bag is squeezed, it will gradually conflict with the inner lining sheet, and when the maximum value of the inner lining sheet is reached, it will be blocked, which is beneficial to prevent the stent from being covered after the vascular plaque expands, causing vascular obstruction, and timely cooperate with the drug elution release to repair the blood vessel.

[0019] In the present invention, after being used for a long time, the drug carried by the stent is eluted and released, and then the drug is injected through the telescopic hole on the drug guide plug, which helps the stent avoid the limitation of the drug carrying amount and improves the utilization effect of the stent.

[0020] Other features and advantages of the present invention will be described in the following description, and part of them will become obvious from the description, or will be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description and the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0022] in:

[0023] Figure 1 This is a schematic diagram of the overall structure of the drug-eluting coronary stent of the present invention.

[0024] Figure 2 It is a schematic diagram of the cross-sectional structure of the main ring frame of the drug-eluting coronary stent of the present invention.

[0025] Figure 3 It is a schematic cross-sectional structure diagram of the main ring frame and the released stent wire of the drug-eluting coronary stent of the present invention.

[0026] Figure 4 This is a partial structural schematic diagram of the main stent assembly of the drug-eluting coronary stent of the present invention.

[0027] Figure 5 This is a schematic diagram of the distribution structure of the drug-eluting coronary stent lining sheet of the present invention.

[0028] Figure 6 This is a schematic diagram of the external structure of the drug-eluting coronary stent of the present invention.

[0029] Figure 7 This is a schematic diagram of the enlarged structure of the drug-introducing plug of the drug-eluting coronary stent of the present invention.

[0030] Figure 8 This is a schematic diagram of the internal structure of the main ring frame of the drug-eluting coronary stent of the present invention when viewed from the front.

[0031] In the figure:

[0032] 1. Main bracket assembly;

[0033] 110, main body ring frame; 111, through hole; 120, release plug; 130, medication chamber;

[0034] 2. Support assembly;

[0035] 210, inner lining sheet; 220, outer lining bag; 230, telescopic hole; 240, drug guide plug;

[0036] 3. Main control linkage components;

[0037] 310, linkage roller; 311, main control belt; 312, elastic wire;

[0038] 410, release stent wire; 420, inner release layer;

[0039] 5. Transfer components;

[0040] 510, center turntable; 520, center transfer rod; 530, irregular cylinder;

[0041] 6. Compression components;

[0042] 610, compression disk; 620, spring; 630, pusher; 640, limiting disk. DETAILED DESCRIPTION

[0043] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0044] Embodiment 1: as Figure 1 and Figure 8As shown, the present invention provides a drug eluting coronary stent, including a main stent assembly 1 and a release stent wire 410, the main stent assembly 1 includes a main body ring frame 110 installed on both sides of the release stent wire 410, a plurality of compression assemblies 6 are arranged inside the main body ring frame 110, the compression assembly 6 includes a plurality of limiting disks 640 annularly fixedly arranged inside the main body ring frame 110, a pusher 630 is inserted and slidably arranged in the middle of the plurality of limiting disks 640, the pusher 630 is located on a side away from each two limiting disks 640 and is fixedly sleeved with a compression disk 610, the outer surface of the pusher 630 is sleeved with a spring 620 used in conjunction with the limiting disk 640, and the outer wall between each two release stent wires 410 is connected with a support assembly 2;

[0045] The supporting assembly 2 includes an outer lining bag 220 connected to the inner wall of the release support wire 410, a main control belt 311 is arranged on the inner side of the outer lining bag 220, a through hole 111 is opened at the connection between the outer wall of the main ring frame 110 and the release support wire 410 and on the inner side of the outer lining bag 220, the main control belt 311 and the through hole 111 are movably arranged to be interlaced, a main control linkage assembly 3 is installed inside the main ring frame 110, an inner release layer 420 is arranged inside the release support wire 410, and a plurality of drug delivery chambers 130 are arranged inside the main ring frame 110.

[0046] In this embodiment, the plaque squeezes the outer lining bag 220 on the bracket. When the outer lining bag 220 is squeezed, the elastic wire 312 is pushed to deform toward the inner side of the main ring frame 110. The main control belt 311 is pulled and slides along the through hole 111, so that the linkage roller 310 rotates in the inner cavity of the main ring frame 110. After the linkage roller 310 rotates, it drives the middle transfer plate 510, so that after the middle transfer rods 520 rotate by an angle, one of the middle transfer rods 520 slides on the surface of the irregular cylinder 530, thereby pushing the irregular The cylinder 530 slides in the main ring frame 110, and the irregular cylinder 530 squeezes the spring 620, so that the pusher 630 drives the compression disk 610 to slide in the drug delivery chamber 130. The pressure in the drug delivery chamber 130 increases, and the drug is pushed from the release plug 120 into the release stent wire 410, which is beneficial to the elution and release of the drug in the coronary stent endothelium. According to the expansion of the plaque in the lesion site, the drug amount can be quantitatively released to prevent the stent from being covered and the blood vessel from being blocked and narrowed, thereby ensuring the smooth flow of the blood vessel.

[0047] Embodiment 2: as Figures 2 to 5As shown, on the basis of Example 1, the present invention provides a technical solution: the main control linkage component 3 includes a plurality of linkage rollers 310 installed in a circular shape inside the main ring frame 110, the main control belt 311 is connected to the linkage roller 310, and both ends of the linkage roller 310 are fixedly connected with a transfer component 5, the transfer component 5 includes a transfer disk 510 fixedly connected to both ends of the linkage roller 310, and a transfer rod 520 fixedly connected to the ends away from the two transfer disks 510, and each of the two transfer disks 510 The ends away from each other are movably sleeved with an irregular cylinder 530, the transfer rod 520 and the irregular cylinder 530 are slidably matched, the irregular cylinder 530 and the pusher 630 are interspersed, and the irregular cylinder 530 is used in conjunction with the spring 620, and the outer wall of the main ring frame 110 is interspersed with a release plug 120, which releases The plugs 120 all pass through the main ring frame 110 and extend to the inside of the release stent wire 410 to communicate with the inner release layer 420. A plurality of elastic wires 312 are longitudinally arranged inside the outer lining bag 220. The elastic wires 312 and the main control belt 311 are overlapped and interspersed. The support assembly 2 includes a plurality of inner lining sheets 210 fixedly connected between every two main ring frames 110. The plurality of inner lining sheets 210 are installed on the inner side of the main ring frame 110 and used in conjunction with the outer lining bag 220. After the plaque at the lesion site expands through the inner lining sheet 210, as the release stent wire 410 and the outer lining bag 220 are squeezed, they will gradually conflict with the inner lining sheet 210. When the maximum value of the inner lining sheet 210 is reached, it is blocked, which is beneficial to prevent the stent from being covered after the expansion of the vascular plaque, causing vascular obstruction, and timely cooperate with the drug elution release to repair the blood vessel.

[0048] In this embodiment, a plurality of drug-conducting plugs 240 are installed in an annular manner through the outer wall of one of the main ring frames 110 . The drug-conducting plugs 240 are respectively connected to the drug-delivering chamber 130 , and telescopic holes 230 are provided on the inner sides of the drug-conducting plugs 240 .

[0049] Embodiment 3: Figure 2 and Figure 7 As shown, based on Example 2, the present invention provides a technical solution:.

[0050] In this embodiment, after the drug carried by the stent is eluted and released, the drug is injected through the telescopic hole 230 on the drug guide plug 240, which helps the stent avoid limitations on the amount of drug it can carry and improves the utilization effect of the stent.

[0051] Let’s talk about the working principle of the drug-eluting coronary stent in detail.

[0052] like Figure 1-8As shown, 1. By inserting a coronary stent into the lesion site and waiting for the drug to be eluted and released, when the stent site relapses, as the plaque increases, the blood vessel contracts, and the plaque squeezes the outer lining bag 220 on the stent. When the outer lining bag 220 is squeezed, the elastic wire 312 is pushed to deform toward the inside of the main ring frame 110, and the main control belt 311 is pulled and slides along the through hole 111, so that the linkage roller 310 rotates in the inner cavity of the main ring frame 110. After the linkage roller 310 rotates, it drives the central rotating disk 510, so that after the central rotating rod 520 rotates an angle, one of the central rotating rods 520 rotates. 0 slides on the surface of the irregular cylinder 530, thereby pushing the irregular cylinder 530 to slide in the main ring frame 110, and the irregular cylinder 530 squeezes the spring 620, so that the pusher 630 drives the compression disk 610 to slide in the drug delivery chamber 130, and the pressure in the drug delivery chamber 130 increases, pushing the drug from the release plug 120 into the release stent wire 410, which is beneficial to the elution and release of the drug in the coronary stent endothelium. According to the expansion of the plaque at the lesion site, the drug amount can be quantitatively released to prevent the stent from being covered and the blood vessel from being blocked and narrowed, thereby ensuring the smooth flow of the blood vessel.

[0053] After the plaque expands at the diseased site through the inner lining sheet 210, as the stent wire 410 is released and the outer lining bag 220 is squeezed, it will gradually conflict with the inner lining sheet 210. When the maximum value of the inner lining sheet 210 is reached, it will be blocked, which is beneficial to prevent the stent from being covered after the expansion of the vascular plaque, causing vascular obstruction, and timely cooperate with the drug elution and release to repair the blood vessel.

[0054] After being used for a long time, the drug carried by the stent is eluted and released, and then the drug is injected through the telescopic hole 230 on the drug guide plug 240, which helps the stent avoid the limitation of the amount of drug carried and improves the utilization effect of the stent.

[0055] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A drug eluting coronary stent, comprising a main stent assembly (1) and a releasable stent wire (410), characterized in that: The main support assembly (1) comprises a main body ring frame (110) mounted on both sides of a release support wire (410); a plurality of compression assemblies (6) are arranged inside the main body ring frame (110); the compression assemblies (6) comprise a plurality of limiting disks (640) fixedly arranged in an annular shape inside the main body ring frame (110); a pusher (630) is inserted and slidably arranged in the middle of each of the limiting disks (640); the pusher (630) is located on a side away from each of the two limiting disks (640) and is fixedly sleeved with a compression disk (610); a spring (620) used in conjunction with the limiting disk (640) is sleeved on the outer surface of the pusher (630); and a support assembly (2) is connected to the outer wall between each of the two release support wires (410); The support assembly (2) comprises an outer lining bag (220) connected to the inner wall of the release support wire (410); a main control belt (311) is arranged on the inner side of the outer lining bag (220); a through hole (111) is provided at the connection between the outer wall of the main ring frame (110) and the release support wire (410) and located on the inner side of the outer lining bag (220); the main control belt (311) and the through hole (111) are arranged to be interlaced and movably arranged; a main control linkage assembly (3) is installed inside the main ring frame (110); an inner release layer (420) is arranged inside the release support wire (410); and a plurality of drug delivery chambers (130) are arranged inside the main ring frame (110).

2. A drug eluting coronary stent according to claim 1, characterized in that: The main control linkage component (3) comprises a plurality of linkage rollers (310) which are installed in a ring-shaped manner inside the main body ring frame (110) for rotation, the main control belt (311) is connected to the linkage rollers (310), and both ends of the linkage rollers (310) are fixedly connected to the transfer components (5).

3. A drug eluting coronary stent according to claim 2, characterized in that: The transfer assembly (5) comprises a transfer disk (510) fixedly connected to both ends of the linkage roller (310), and a transfer rod (520) fixedly connected to the ends of the two transfer disks (510) that are away from each other.

4. A drug eluting coronary stent according to claim 3, characterized in that: An irregular cylinder (530) is movably mounted on one end of each of the two rotating disks (510) that are away from each other. The rotating rod (520) and the irregular cylinder (530) are slidably matched. The irregular cylinder (530) and the pusher (630) are interlaced and arranged. The irregular cylinder (530) and the spring (620) are used in combination.

5. The drug-eluting coronary stent according to claim 1, characterized in that: Release plugs (120) are inserted and installed on the outer wall of the main body ring frame (110); the release plugs (120) all pass through the main body ring frame (110) and extend to the inside of the release support wire (410) to communicate with the inner release layer (420).

6. The drug-eluting coronary stent according to claim 1, characterized in that: A plurality of elastic threads (312) are longitudinally arranged inside the outer lining bag (220), and the elastic threads (312) and the main control belt (311) are arranged to overlap and intersect.

7. The drug-eluting coronary stent according to claim 1, characterized in that: The support assembly (2) comprises a plurality of inner lining sheets (210) fixedly connected between every two of the main body ring frames (110); the plurality of inner lining sheets (210) are installed on the inner side of the main body ring frames (110) and used in conjunction with the outer lining bag (220).

8. The drug-eluting coronary stent according to claim 1, characterized in that: A plurality of drug guiding plugs (240) are installed in an annular manner through the outer wall of one of the main body ring frames (110); the drug guiding plugs (240) are respectively connected to the drug administering chamber (130); and telescopic holes (230) are provided on the inner sides of the drug guiding plugs (240).

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