Coronary artery three-way stent and three-way stent assembly

Abstract

The invention belongs to the field of medical surgical instruments, and provides a coronary artery three-way stent which comprises a main stent body and a branch stent body communicated with the main stent body, the main stent body and the branch stent body comprise a plurality of annular units arranged at intervals, and every two adjacent annular units are connected through a plurality of first connecting units to form a tubular structure. The main bracket is connected with the branch brackets through a plurality of second connecting units; the invention further provides a coronary artery three-way support assembly, the coronary artery three-way support assembly comprises a three-way balloon device and the coronary artery three-way support, the three-way balloon device comprises a balloon catheter and a main balloon arranged on the balloon catheter, the balloon catheter comprises a first inner tube, a second inner tube and an infusion channel, the infusion channel is communicated with the main balloon, and the first inner tube is communicated with the second inner tube. A branch balloon communicated with the main balloon is arranged on the main balloon, and the three-way balloon device is used for conveying the coronary artery three-way stent to a lesion position and expanding the coronary artery three-way stent.

Description

Technical Field

[0001] The invention belongs to the field of medical surgical instruments, and in particular relates to a coronary artery three-way stent and a three-way stent assembly. Background Art

[0002] The coronary artery is an artery that supplies blood to the heart. It originates from the aortic sinus at the root of the aorta and is divided into two branches, the left and right coronary arteries. The left and right branches each have multiple pairs of branch vessels. Coronary bifurcation lesions refer to coronary artery stenosis adjacent to and / or involving the openings of important branch vessels. Coronary bifurcation lesions are relatively common in clinical practice and are also the difficulty and focus of coronary interventional treatment. Coronary stents are commonly used medical devices in cardiac interventional surgery, and stent implantation is a common treatment for heart diseases such as coronary atherosclerosis.

[0003] The existing medical treatment for coronary bifurcation lesions generally involves implanting two stents twice at the bifurcation of the blood vessel to form a three-way stent. This method is cumbersome and requires repeated implantation of the stent twice. The stent also needs to be adjusted and kissed multiple times. The operation takes a long time and has high technical requirements for medical staff. At the same time, the stents are prone to stacking at the intersection of the two stents, and the stent mesh is dense, which has the risk of affecting blood circulation and further forming thrombi. In this regard, it is necessary to propose a new coronary three-way stent and three-way stent assembly to address the technical problems of cumbersome operation and stent stacking of the existing three-way stent.

[0004] In the prior art, patent CN217310716U discloses a branched vascular stent and a balloon-expandable vascular stent assembly, including a hollow stent main body, a branch tube provided on the stent main body, the stent main body being connected to the inside of the branch tube, and a balloon-expandable device for deploying the stent. The branched vascular stent provided in this patent is suitable for the bifurcation of the iliac artery and the femoral artery, but is not designed for the coronary artery, and does not solve the problems of dense mesh at the bifurcation of the vascular stent, stent stacking, and cumbersome surgical procedures. Summary of the invention

[0005] In order to overcome the deficiencies and defects mentioned in the above background technology, the present invention provides a coronary artery three-way stent and a three-way stent assembly which can effectively avoid the influence of the stent on blood flow.

[0006] The present invention provides a coronary artery three-way stent, comprising a main stent and a sub-stent connected to the main stent; The main support and the sub-support include a plurality of annular units arranged at intervals, two adjacent annular units are connected by a plurality of first connecting units to form a tubular structure, and the main support and the sub-support are connected by a plurality of second connecting units; The annular unit is a wavy structure, the first connecting unit and the second connecting unit are both straight at both ends and S-shaped in the middle, the diameter of the second connecting unit is larger than the first connecting unit, and the length of the main bracket is larger than the length of the sub-branch.

[0007] In one embodiment, a reinforcing connection piece is provided between adjacent second connection units.

[0008] In one embodiment, the crests and troughs of adjacent annular units are arranged opposite to each other, and the first connecting unit is arranged at a position where the crests and troughs are close to each other.

[0009] In one embodiment, the length of the main stent after expansion is 5-8 mm, and the length of the sub-stent after expansion is 2-4 mm.

[0010] In one embodiment, the diameter of the main stent after expansion is larger than the diameter of the sub-stent, the diameter of the main stent after expansion is 2.5-4.0 mm, and the diameter of the sub-stent after expansion is 2.0-2.75 mm.

[0011] In one embodiment, the angle between the central axis of the main support and the sub-support is an acute angle.

[0012] In one embodiment, the material of the main support and the sub-support is selected from one of stainless steel, cobalt alloy, chromium alloy, magnesium alloy and polylactic acid.

[0013] The present invention also provides a coronary artery three-way stent assembly, comprising a three-way balloon device and the coronary artery three-way stent as described above; The three-way balloon device comprises a balloon catheter and a main balloon arranged on the balloon catheter, wherein the balloon catheter comprises a first inner tube, a second inner tube and an infusion channel, and the infusion channel is connected with the main balloon; The main balloon is provided with a branch balloon connected to the main balloon, the first inner tube passes through the main balloon, the second inner tube passes through the main balloon and the branch balloon, the first guide wire and the second guide wire pass through the first inner tube and the second inner tube respectively, guide the movement of the main balloon and the branch balloon, and the ends of the main balloon and the branch balloon are flush.

[0014] In one embodiment, the diameter of the main balloon after expansion is 2.5-4.0 mm, and the diameter of the branch balloon after expansion is 2.0-2.75 mm.

[0015] In one embodiment, both the main balloon and the branch balloon are provided with developing rings, and the developing rings are sleeved on the first inner tube or the second inner tube.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. In the coronary artery three-way stent provided by the present invention, two adjacent annular units are connected by multiple first connecting units to form a tubular structure, and the two ends of the first connecting unit are straight, and the middle is an S-shaped curved structure, which is not easy to be compressed and deformed, and has better structural stability. The main stent and the branch stent are connected by the second connecting unit and the reinforcing connecting piece, which solves the problems of dense mesh and stent stacking at the intersection of the traditional branch-type vascular stent, effectively avoids the influence of the stent on blood flow, greatly reduces the risk of thrombosis, and ensures the structural strength of the connection.

[0017] 2. The coronary three-way stent assembly provided by the present invention is designed with a balloon device with a branching structure, which is suitable for the coronary three-way stent provided by the present invention. The coronary three-way stent can be delivered to a designated position by means of this device, and the coronary three-way stent can be expanded into place with only one pressurization and expansion operation, which greatly simplifies the surgical steps of traditional branch-type stents. There is no need to use balloons multiple times to separately deliver the main stent and the sub-stent, which is beneficial to reducing the surgical pain of patients and also reduces the technical requirements for medical staff. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a schematic structural diagram of a coronary artery three-way stent according to an embodiment; Figure 2 It is a schematic diagram of the deployment structure of a three-way coronary stent according to one embodiment; Figure 3 is a schematic diagram of a balloon expansion state of a three-way balloon device according to another embodiment; Figure 4 It is a schematic diagram of the balloon deflated state of the three-way balloon device according to another embodiment.

[0020] Figure numerals: 1, annular unit; 21, first connecting unit; 22, second connecting unit; 3, reinforcing connector; 4, catheter; 41, first inner tube; 42, second inner tube; 411, first guide wire; 421, second guide wire; 43, infusion channel; 51, main balloon; 52, branch balloon. DETAILED DESCRIPTION

[0021] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively and meticulously below in conjunction with the accompanying drawings and preferred embodiments of the present invention, but the protection scope of the present invention is not limited to the following specific embodiments.

[0022] Unless otherwise defined, all professional terms used below have the same meanings as those generally understood by those skilled in the art. The professional terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the scope of protection of the present invention.

[0023] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in the present invention can be purchased from the market or prepared by existing methods.

[0024] It should be noted that, in this description, the end of the balloon away from the catheter is referred to as the "end" of the stent, and "axial direction" refers to the length direction of the stent. Example

[0025] See also Figure 1 and Figure 2 , a coronary artery three-way stent provided in an embodiment of the present invention, comprising a main stent and a sub-stent connected to the main stent; The main support and the sub-support include a plurality of annular units 1 arranged at intervals, two adjacent annular units 1 are connected by a plurality of first connecting units 21 to form a tubular structure, and the main support and the sub-support are connected by a plurality of second connecting units 22; The annular unit 1 is a wavy structure, the first connecting unit 21 and the second connecting unit 22 are both straight at both ends and S-shaped in the middle, the diameter of the second connecting unit 22 is larger than the first connecting unit 21, and the length of the main bracket is larger than the length of the sub-branch.

[0026] It is worth noting that the second connecting unit 22 is used to connect the main stent and the branch stent, which effectively avoids the dense mesh and stent stacking of the traditional three-way stent at the branch, is beneficial to blood circulation, and reduces the possibility of accumulation of various substances at the bifurcation of blood vessels to form thrombi; at the same time, the shape design of the first connecting unit 21 and the second connecting unit 22, which are straight at both ends and S-shaped in the middle, provides a certain deformation space for the stent when it is subjected to force. Compared with a simple straight line connection, it is not easy to cause irregular deformation when subjected to force, and the structural strength is higher, ensuring the overall strength of the three-way stent; in addition, the second connecting unit 22 has a larger diameter and a higher strength than the first connecting unit 21, which can ensure the stability of the connection between the branch stent and the main stent; and the wavy annular unit 1 has a larger deformation capacity, so that the three-way stent can expand and play a role in expanding and unblocking blood vessels.

[0027] As a preferred embodiment, a reinforcing connection member 3 is provided between adjacent second connection units 22 .

[0028] In this embodiment, a reinforcing connector 3 is provided in the middle of the second connecting unit 22, which can further enhance the structural strength of the bracket at the branch and reduce deformation of the bracket.

[0029] As a preferred embodiment, the crests and troughs of adjacent annular units 1 are arranged relative to each other, and the first connecting unit 21 is arranged at a position where the crests and troughs are close to each other. There are two forms of relative arrangement of the crests and troughs, one of which is that the crests and troughs are close to each other with a first distance between them, and the other is that the crests and troughs are far away from each other with a second distance between them, and the second distance is greater than the first distance. The first connecting unit 21 is arranged between the crests and troughs of adjacent annular units 1 with the first distance.

[0030] It should be understood that by relatively arranging the crests and troughs of each adjacent annular unit 1, the size of the mesh on the surface of the stent can be increased, which is beneficial to blood circulation. At the same time, the first connecting unit 21 is arranged between the crests and troughs of the adjacent annular units 1 with a first distance, which can shorten the length of the first connecting unit 21, which is beneficial to the stability of the stent and reduces the possibility of deformation of the stent.

[0031] As a preferred embodiment, the length of the main stent after expansion is 5-8mm, and the length of the branch stent after expansion is 2-4mm. The overall length of the coronary three-way stent is short, and its three ends can be connected to linear stents. The coronary three-way stent is used as a bridging structure to solve the problem of poor control of stent surgery at the bifurcation of arterial vessels. After the coronary three-way stent of the present application is placed at the bifurcation of arterial vessels, the linear stent can be bridged at any of the three ports as needed.

[0032] The lengths of the main stent and the branch stent described in this embodiment take into account the permeability of the stent in the blood vessel and the applicable scope of the stent. On the premise of being able to meet the treatment needs of bifurcation lesions, the length of the stent is as short as possible to improve the permeability of the stent in the blood vessel; on the other hand, different patients have individual differences, and the size and shape of the blood vessels are different. The shorter three-way stent It can better target the bifurcation lesions of the coronary arteries, try to avoid involving the blood vessels at both ends of the bifurcation, and improve the wide applicability of the three-way stent.

[0033] As a preferred embodiment, the diameter of the main stent after expansion is larger than the diameter of the sub-stent, the diameter of the main stent after expansion is 2.5-4.0 mm, and the diameter of the sub-stent after expansion is 2.0-2.75 mm.

[0034] The diameter of the stent is designed to fit the actual diameter of the coronary artery of a general patient.

[0035] As a preferred embodiment, the angle between the central axis of the main support and the sub-support is an acute angle.

[0036] The angle is designed in consideration of the actual bifurcation direction of the coronary artery.

[0037] As a preferred embodiment, the material of the main bracket and the sub-branch is selected from one of stainless steel, cobalt alloy, chromium alloy, magnesium alloy and polylactic acid.

[0038] The above-mentioned metal materials are all commonly used materials for making vascular stents, and have the characteristics of high strength and light weight; polylactic acid is a fully degradable polymer and is a commonly used material for making degradable stents, which can avoid the long-term risks brought by the permanent retention of metal stents in the body.

[0039] See also Figure 3 and Figure 4 , one embodiment of the present invention further provides a coronary artery three-way stent assembly, comprising a three-way balloon device and the coronary artery three-way stent described in any one of the above embodiments; The three-way balloon device includes a balloon catheter 4 and a main balloon 51 disposed on the balloon catheter 4. The balloon catheter 4 includes a first inner tube 41, a second inner tube 42 and an infusion channel 43. The infusion channel 43 is connected to the main balloon 51. The main balloon 51 is provided with a branch balloon 52 connected to the main balloon 51, the first inner tube 41 passes through the main balloon 51, the second inner tube 42 passes through the main balloon 51 and the branch balloon 52, the first guide wire 411 and the second guide wire 421 pass through the first inner tube 41 and the second inner tube 42 respectively, to guide the movement of the main balloon 51 and the branch balloon 52, and the ends of the main balloon 51 and the branch balloon 52 are flush.

[0040] It is worth noting that the three-way balloon device provided in this embodiment has a branch balloon 52 arranged on the main balloon 51, and the branch balloon 52 is connected to the main balloon 51. The main balloon 51 and the branch balloon 52 can be expanded by pumping pressurized liquid into the main balloon 51 and the branch balloon 52 through the infusion channel 43, and the main stent and the branch stent are expanded at the same time, which greatly simplifies the surgical steps of traditional three-way stent implantation; at the same time, the main balloon 51 and the branch balloon 52 are provided with a first inner tube 41 and a second inner tube 42, allowing the first guide wire 411 and the second guide wire 421 to pass through the first inner tube 41 and the second inner tube 42 respectively, and the two guide wires are guided at the same time, so that the balloon device can be quickly and accurately delivered to the bifurcation lesion position of the coronary artery; in addition, the design that the ends of the main balloon 51 and the branch balloon 52 are flush can reduce the resistance of the balloon device to the passage of the blood vessel, and also reduce the damage of the balloon end to the blood vessel.

[0041] As a preferred embodiment, the diameter of the main balloon 51 after expansion is 2.5-4.0 mm, and the diameter of the branch balloon 52 after expansion is 2.0-2.75 mm.

[0042] The expansion sizes of the main balloon 51 and the branch balloon 52 correspond to the sizes of the three-way stent described above.

[0043] As a preferred embodiment, both the main balloon 51 and the branch balloon 52 are provided with a developing ring, and the developing ring is sleeved on the first inner tube 41 or the second inner tube 42. In this embodiment, the main balloon 51 and the branch balloon 52 are provided with developing rings to facilitate the surgeon to monitor the position of the balloon in the blood vessel through an external instrument during the operation, so as to guide the operation.

Claims

1. A three-way coronary stent, characterized in that: It includes a main support and a sub-support connected to the main support; The main support and the sub-support include a plurality of annular units arranged at intervals, two adjacent annular units are connected by a plurality of first connecting units to form a tubular structure, the main support and the sub-support are connected by a plurality of second connecting units, and the length of the main support is greater than the length of the sub-support; The annular unit is a wave-shaped structure, both ends of the first connecting unit and the second connecting unit are straight lines, and the middle is an S-shaped curved structure, and the diameter of the second connecting unit is larger than that of the first connecting unit.

2. The three-way coronary stent according to claim 1, characterized in that: Reinforced connecting pieces are arranged between adjacent second connecting units.

3. The three-way coronary stent according to claim 1, characterized in that: The crests and troughs of adjacent annular units are arranged opposite to each other, and the first connecting unit is arranged at a position where the crests and troughs are close to each other.

4. The three-way coronary stent according to claim 1, characterized in that: The length of the main stent after expansion is 5-8 mm, and the length of the sub-stent after expansion is 2-4 mm.

5. The three-way coronary stent according to claim 4, characterized in that: The diameter of the main stent after expansion is larger than that of the sub-stent. The diameter of the main stent after expansion is 2.5-4.0 mm, and the diameter of the sub-stent after expansion is 2.0-2.75 mm.

6. The three-way coronary stent according to claim 1, characterized in that: The included angle between the central axis of the main support and the sub-support is an acute angle.

7. The three-way coronary stent according to claim 1, characterized in that: The material of the main support and the sub-support is selected from one of stainless steel, cobalt alloy, chromium alloy, magnesium alloy and polylactic acid.

8. A coronary artery three-way stent assembly, characterized in that: It comprises a three-way balloon device and a three-way coronary stent according to any one of claims 1 to 7; The three-way balloon device comprises a balloon catheter and a main balloon arranged on the balloon catheter, wherein the balloon catheter comprises a first inner tube, a second inner tube and an infusion channel, and the infusion channel is connected with the main balloon; The main balloon is provided with a branch balloon connected to the main balloon, the first inner tube passes through the main balloon, the second inner tube passes through the main balloon and the branch balloon, the first guide wire and the second guide wire pass through the first inner tube and the second inner tube respectively, guide the movement of the main balloon and the branch balloon, and the ends of the main balloon and the branch balloon are flush.

9. The coronary artery three-way stent assembly according to claim 8, characterized in that: The diameter of the main balloon after expansion is 2.5-4.0 mm, and the diameter of the branch balloon after expansion is 2.0-2.75 mm.

10. The coronary artery three-way stent assembly according to claim 8, characterized in that: The main balloon and the branch balloon are both provided with developing rings, and the developing rings are sleeved on the first inner tube or the second inner tube.

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