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

Abstract

The utility model belongs to the field of medical surgical instruments, and provides a coronary artery three-way support which comprises a main support and a branch support communicated with the main support, the main support and the branch support 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 utility model 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, and 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, 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 utility model belongs to the field of medical operation instrument, especially relates to a coronary artery three-way stent and three-way stent assembly. BACKGROUND

[0002] Coronary artery is the artery that supplies blood to the heart, which originates in the aortic root sinus of the aorta, divides into left and right coronary arteries, and has multiple pairs of branch vessels in the left and right branches. Coronary artery bifurcation disease refers to the stenosis of the coronary artery adjacent to and / or involving the opening of the important branch vessels. Coronary artery bifurcation disease is common in clinical practice and is also a difficulty and focus in the field of coronary artery intervention. Coronary artery stent is a commonly used medical instrument in heart intervention surgery, and implanting a stent is a common treatment for coronary atherosclerotic heart disease.

[0003] The existing medical treatment for coronary artery bifurcation disease generally involves implanting two stents at the vascular bifurcation to form a three-way stent. This method is complicated to operate, requires repeated implantation of two stents, and needs multiple adjustments and kissing operations on the stents, which takes a long time and requires high technical skills from medical staff. In addition, the stents at the intersection of the two stents are prone to stacking, which may affect blood circulation and further form thrombus. Therefore, it is necessary to propose a new coronary artery three-way stent and three-way stent assembly to overcome the technical problems of complicated operation and stent stacking.

[0004] In the prior art, patent CN217310716U discloses a branch type vascular stent and a ball expansion type vascular stent assembly, which includes an internal hollow stent main pipe, a branch pipe is arranged on the stent main pipe, and the stent main pipe and the branch pipe are in internal communication. A ball expansion device for expanding the stent is also disclosed. The branch type vascular stent provided by the patent is suitable for the bifurcation of iliac artery and femoral artery, but it is not designed for coronary artery, and it does not solve the problems of dense mesh at the bifurcation of the vascular stent, stent stacking, and complicated surgical steps. UTILITY MODEL CONTENT

[0005] The utility model provides a coronary artery three-way stent and three-way stent assembly that can effectively avoid the influence of the stent on blood flow to overcome the deficiencies and defects mentioned in the above background technology.

[0006] The utility model provides a coronary artery three-way stent, which includes a main stent and a branch stent in communication with the main stent.

[0007] The main stent and the branch stent include a plurality of spaced ring units, two adjacent ring units are connected by a plurality of first connecting units to form a tubular structure, and the main stent and the branch stent are connected by a plurality of second connecting units.

[0008] The ring unit is a wavy structure, the first connecting unit and the second connecting unit are both linear at both ends and S-shaped in the middle, the diameter of the second connecting unit is larger than that of the first connecting unit, and the length of the main support is larger than that of the branch support.

[0009] In one of the embodiments, a reinforcing connecting piece is arranged between adjacent second connecting units.

[0010] In one of the embodiments, the wave crest and the wave trough of adjacent ring units are arranged oppositely, and the first connecting unit is arranged at a position where the wave crest and the wave trough are close to each other.

[0011] In one of the embodiments, the length of the main support after expansion is 5-8 mm, and the length of the branch support after expansion is 2-4 mm.

[0012] In one of the embodiments, the diameter of the main support after expansion is larger than that of the branch support, the diameter of the main support after expansion is 2.5-4.0 mm, and the diameter of the branch support after expansion is 2.0-2.75 mm.

[0013] In one of the embodiments, the included angle between the central axis of the main support and the branch support is an acute angle.

[0014] In one of the embodiments, the material of the main support and the branch support is selected from one of stainless steel, cobalt alloy, chromium alloy, magnesium alloy and polylactic acid.

[0015] The utility model discloses still provide a kind of coronary artery three-way stent assembly, including three-way balloon device and the coronary artery three-way stent as described above;

[0016] The three-way balloon device includes a balloon catheter and a main balloon disposed on the balloon catheter. The balloon catheter includes a first inner tube, a second inner tube, and a transfusion channel. The transfusion channel is in communication with the main balloon.

[0017] The main balloon is provided with a branch balloon in communication with the main balloon. The first inner tube passes through the main balloon, and 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 to guide the movement of the main balloon and the branch balloon. The ends of the main balloon and the branch balloon are flush.

[0018] In one of the embodiments, 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.

[0019] In one of the embodiments, a developing ring is arranged in the main balloon and the branch balloon, and the developing ring is sleeved on the first inner tube or the second inner tube.

[0020] Compared with the prior art, the coronary artery three-way stent has the beneficial effects that:

[0021] 1. The coronary artery three-way stent is characterized in that: adjacent two ring-shaped units are connected to form a tubular structure through a plurality of first connecting units, both ends of the first connecting unit are linear, and the middle is an S-shaped bending structure, the coronary artery three-way stent is not easy to compress and deform, has better structural stability, the main stent and the branch stent are connected through the second connecting unit and the reinforcing connecting piece, the problem of dense mesh at the intersection of the traditional branch type vascular stent and stent stacking is solved, the influence of the stent on blood flow is effectively avoided, the risk of thrombosis is greatly reduced, and the structural strength of the connection part is ensured.

[0022] 2. The coronary artery three-way stent assembly is characterized in that: a balloon device with a branch structure is designed, is suitable for the coronary artery three-way stent, the coronary artery three-way stent can be delivered to a specified position through the device, and the coronary artery three-way stent can be expanded in place only through one-time pressurized expansion operation, the surgical steps of the traditional branch type stent are greatly simplified, the main stent and the branch stent do not need to be delivered respectively through multiple times of use of the balloon, patient surgical pain is reduced, and the technical requirements for medical staff are also reduced. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0024] Figure 1 FIG. 1 is a structural schematic view of a coronary artery three-way stent according to an embodiment;

[0025] Figure 2 FIG. 2 is a schematic view of an unfolded structure of the coronary artery three-way stent according to an embodiment;

[0026] Figure 3 FIG. 3 is a schematic view of a balloon expansion state of a three-way balloon device according to another embodiment;

[0027] Figure 4 FIG. 4 is a schematic view of a balloon contraction state of the three-way balloon device according to another embodiment.

[0028] The drawings show that: 1, ring-shaped unit; 21, first connecting unit; 22, second connecting unit; 3, reinforcing connecting piece; 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

[0029] In order to facilitate the understanding of the present application, the following will make a more comprehensive and detailed description of the present application in combination with the drawings of the specification and the preferred embodiments, but the protection scope of the present application is not limited to the following specific embodiments.

[0030] Unless otherwise defined, all the professional terms used in the following have the same meaning as that generally understood by the person skilled in the art. The professional terms used in the present application are only for the purpose of describing the specific embodiments and are not intended to limit the protection scope of the present application.

[0031] Unless otherwise specified, the various raw materials, reagents, instruments and equipment used in the present application can be purchased from the market or can be prepared by the existing method.

[0032] It should be noted that in the present description, the end of the balloon away from the catheter is referred to as the "end" of the stent, and the "axial direction" refers to the length direction of the stent. EMBODIMENT

[0033] Please refer to Figure 1 and Figure 2 The coronary artery three-way stent provided by an embodiment of the present application comprises a main stent and a branch stent in communication with the main stent.

[0034] The main stent and the branch stent comprise 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 stent and the branch stent are connected by a plurality of second connecting units 22.

[0035] The annular unit 1 is in a wavy structure, the first connecting unit 21 and the second connecting unit 22 are both in a linear type at both ends and are both in an S-shaped curved structure in the middle, the diameter of the second connecting unit 22 is greater than that of the first connecting unit 21, and the length of the main stent is greater than that of the branch stent.

[0036] It is worth mentioning that the second connecting unit 22 is used to connect the main stent and the branch stent, which effectively avoids the mesh density and stent stacking at the branch of the traditional tee stent, is beneficial to the circulation of blood, and reduces the possibility of thrombosis caused by the accumulation of various substances at the bifurcation of the blood vessel; at the same time, the linear shape at both ends and the S-shaped bending in the middle of the first connecting unit 21 and the second connecting unit 22 provide a certain deformation space for the stent under stress, which is not easy to deform irregularly under stress compared with simple linear connection, and has higher structural strength, which ensures the overall strength of the tee stent; in addition, the second connecting unit 22 has a larger diameter and 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 wave-shaped ring unit 1 has a large deformation capacity, so that the tee stent can be expanded to play a role in expanding and dredging blood vessels.

[0037] As a preferred embodiment, a reinforcing connecting piece 3 is arranged between adjacent second connecting units 22.

[0038] In the embodiment, the reinforcing connecting piece 3 is arranged in the middle of the second connecting unit 22, which can further strengthen the structural strength of the stent at the branch and reduce the deformation of the stent.

[0039] As a preferred embodiment, the wave crests and wave troughs of adjacent ring units 1 are arranged oppositely, and the first connecting unit 21 is arranged at a position where the wave crests and wave troughs are close to each other. Among them, there are two forms of opposite arrangement of wave crests and wave troughs, one of which is that the wave crests and wave troughs are close to each other and have a first distance between them, and the other is that the wave crests and wave troughs are far away from each other and have a second distance between them, the second distance being greater than the first distance. The first connecting unit 21 is arranged between the wave crests and wave troughs of adjacent ring units 1 having the first distance.

[0040] It should be understood that the opposite arrangement of the wave crests and wave troughs of each adjacent ring unit 1 can increase the size of the stent surface mesh, which is beneficial to the circulation of blood, and the arrangement of the first connecting unit 21 between the wave crests and wave troughs of adjacent ring units 1 having the first distance 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.

[0041] 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 artery tee stent is relatively short, and the three ends thereof can be connected to linear stents. The coronary artery tee stent is used as a bridging structure to solve the problem of difficult control of stent surgery at the bifurcation of the artery, and after the coronary artery tee stent of the present application is placed at the bifurcation of the artery, linear stents can be bridged at any of the three ports as needed.

[0042] The length of the main stent and the branch stent in the embodiment takes into account the passability of the stent in the blood vessel and the application range of the stent, and the length of the stent is as short as possible under the premise of meeting the treatment needs of the bifurcated lesion, so as to improve the passability of the stent in the blood vessel; on the other hand, different patients have individual differences, and the sizes and shapes of blood vessels are different, so that the shorter three-way stent

[0043] The bifurcated lesion of the coronary artery can be better targeted, the blood vessels at both ends of the bifurcated blood vessel are avoided as much as possible, and the wide applicability of the three-way stent is improved.

[0044] As a preferred embodiment, the diameter of the main stent after expansion is greater than the diameter of the branch stent, the diameter of the main stent after expansion is 2.5-4.0mm, and the diameter of the branch stent after expansion is 2.0-2.75mm.

[0045] The design of the stent diameter is to adapt to the actual diameter of the coronary artery of a general patient.

[0046] As a preferred embodiment, the included angle between the central axis of the main stent and the branch stent is an acute angle.

[0047] The included angle is designed in consideration of the actual bifurcation direction of the coronary artery.

[0048] As a preferred embodiment, the material of the main stent and the branch stent is selected from one of stainless steel, cobalt alloy, chromium alloy, magnesium alloy and polylactic acid.

[0049] The above-mentioned metal materials are common materials for manufacturing blood vessel stents, and have the characteristics of high strength and light weight; and polylactic acid is a completely degradable polymer, which is a common material for manufacturing degradable stents, and can avoid the long-term risk of permanent retention of metal stents in the body.

[0050] Please refer to Figure 3 and Figure 4 , the utility model discloses a kind of coronary artery three-way stent components, including three-way balloon device and the coronary artery three-way stent described in any one embodiment above;

[0051] 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 a transfusion channel 43, and the transfusion channel 43 is in communication with the main balloon 51.

[0052] The main balloon 51 is provided with a branch balloon 52 in communication with 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, guiding 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.

[0053] It is worth noting that the three-way balloon device provided by the embodiment is provided with the branch balloon 52 on the main balloon 51, the branch balloon 52 is in communication with the main balloon 51, and the main balloon 51 and the branch balloon 52 can be inflated by pumping the pressurized liquid into the main balloon 51 and the branch balloon 52 through the infusion channel 43, so that the main stent and the branch stent are expanded, greatly simplifying the surgical steps of traditional three-way stent implantation; meanwhile, the first inner tube 41 and the second inner tube 42 are arranged in the main balloon 51 and the branch balloon 52, 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 can guide the balloon device to be quickly and accurately delivered to the bifurcated 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 passing through the blood vessel, and also reduce the damage of the balloon end to the blood vessel.

[0054] As a preferred embodiment, the diameter of the main balloon 51 after inflation is 2.5-4.0mm, and the diameter of the branch balloon 52 after inflation is 2.0-2.75mm.

[0055] The inflation size of the main balloon 51 and the branch balloon 52 corresponds to the size of the three-way stent described above.

[0056] As a preferred embodiment, the main balloon 51 and the branch balloon 52 are each 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 developing ring arranged in the main balloon 51 and the branch balloon 52 can facilitate the surgical personnel to monitor the position of the balloon in the blood vessel through external instruments during the operation process, so as to guide the surgical operation.

Claims

1. A coronary trifurcation stent, characterized in that, The main support and the branch support comprise a plurality of ring units arranged at intervals, two adjacent ring units are connected by a plurality of first connecting units to form a tubular structure, the main support and the branch support are connected by a plurality of second connecting units, and the length of the main support is greater than that of the branch support. The ring unit is in a wave shape, the first connecting unit and the second connecting unit are in a linear shape at both ends and in an S-shaped curved structure in the middle, and the diameter of the second connecting unit is greater than that of the first connecting unit. A reinforcing connecting piece is arranged between adjacent second connecting units.

2. The coronary trifurcation stent of claim 1, wherein, The wave crest and the wave trough of adjacent ring units are arranged oppositely, and the first connecting unit is arranged at a position where the wave crest and the wave trough are close to each other.

3. The coronary trifurcation stent of claim 1, wherein, The length of the main support after expansion is 5-8 mm, and the length of the branch support after expansion is 2-4 mm.

4. The coronary trifurcation stent of claim 1, wherein, The diameter of the main support after expansion is greater than that of the branch support, the diameter of the main support after expansion is 2.5-4.0 mm, and the diameter of the branch support after expansion is 2.0-2.75 mm.

5. The coronary three-branch stent of claim 4, wherein, The included angle between the central axis of the main support and the branch support is an acute angle.

6. The coronary three-branch stent of claim 1, wherein, The material of the main support and the branch support is selected from one of stainless steel, cobalt alloy, chromium alloy, magnesium alloy and polylactic acid.

7. The coronary three-branch stent of claim 1, wherein, The three-way balloon device and the coronary three-way support according to any one of claims 1-7 are provided.

8. A coronary trifurcation stent assembly, comprising: 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 a liquid delivery channel, and the liquid delivery channel is in communication with the main balloon. The main balloon is provided with a branch balloon in communication with 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, a first guide wire and a second guide wire pass through the first inner tube and the second inner tube respectively to guide the movement of the main balloon and the branch balloon, and the ends of the main balloon and the branch balloon are flush. 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.

9. The coronary trifurcation stent assembly of claim 8, wherein, The main balloon and the branch balloon are both provided with a developing ring, and the developing ring is sleeved on the first inner tube or the second inner tube.

10. The coronary trifurcation stent assembly of claim 8, wherein, ​

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