Medical luminal stent

Abstract

The present application relates to a medical lumen stent, which includes a main body coating, a branch coating and a connecting coating. Both the main body coating and the branch coating are cylindrical, and the side wall of the main body coating is provided with one or more first mounting holes, and each branch coating is arranged correspondingly at the position where the first mounting hole is located. The diameter of the branch coating is smaller than the inner diameter of the first mounting hole, and the axial direction of the main body coating and the axial direction of the branch coating are not arranged parallel. The connecting coating is sloped, and one end of the connecting coating is connected to the edge of the first mounting hole, and the other end is recessed toward the inner side of the main body coating and connected to the edge of one end of the branch coating. The branch coating is arranged on the outside of the connecting coating, and the end of the branch coating away from the connecting coating extends in a direction away from the axis of the main body coating. The medical lumen stent provided by the present application solves the technical problems brought about by the four existing solutions.

Description

Technical Field

[0001] The present application relates to the technical field of lumen stents, and in particular to a medical lumen stent. Background Art

[0002] There are many technical solutions for reconstructing branch arteries, but each of them has its own obvious disadvantages. For example, the first solution is a fenestration stent solution, which specifically involves placing a main stent without an opening into the main lumen, and then delivering a hole-making device into the main stent and making a hole (also called a window) in the side wall of the main stent. This arrangement, on the one hand, is difficult to transport the hole-making device, so the operation is difficult, and on the other hand, direct hole-making is likely to reduce the sealing of the hole, which in turn makes the main stent prone to internal leakage.

[0003] In order to solve the problem that the window stent solution is difficult to open and prone to internal leakage, the second solution is to adopt an external branch stent solution, that is, to set one or more external stents protruding from the surface of the main stent on the outer peripheral side of the main stent. However, such a setting increases the radial width of the entire stent, which seriously affects the delivery of the entire stent in the main cavity.

[0004] The third solution is to adopt an internal branch stent solution, that is, to set one or more inwardly protruding inner stents on the inner wall of the main stent. In this way, when the body fluid in the inner cavity of the main stent flows through the inner stent, turbulence will be generated due to the direct blocking effect of the inner stent, which will affect the body fluid in the main stent from entering the inner stent.

[0005] In order to solve the technical problem that body fluids are difficult to enter the inner stent in the third solution, the technicians improved the fourth solution based on the third solution. Specifically, a guide section parallel to the main stent is provided on the basis of the inner stent, and the opening of the guide section is toward the entrance direction of the body fluid, so that the body fluid can smoothly enter the inner stent.

[0006] However, such a configuration not only greatly increases the overall volume of the inner stent, so that more space in the inner cavity of the main stent is occupied, and the effective diameter of the stent at the distal end of the lumen after reconstruction is greatly reduced, but also greatly increases the force-bearing surface of the inner stent, so that the inner stent generates greater vibrations under the impact of body fluids, thereby affecting the safety of surgical operation.

[0007] From the above, it can be seen that the existing first solution, second solution, third solution and fourth solution all have significant defects and cannot meet the requirements of reconstructing branch arteries. Summary of the invention

[0008] Based on this, it is necessary to provide a medical luminal stent to solve the technical problems brought about by the four existing solutions.

[0009] The medical luminal stent provided by the present application includes a main body coating, a branch coating and a connecting coating, the main body coating and the branch coating are both in a cylindrical shape, the side wall of the main body coating is provided with one or more first mounting holes, each branch coating is correspondingly arranged at the position where the first mounting hole is located, the diameter of the branch coating is smaller than the inner diameter of the first mounting hole, and the axial direction of the main body coating and the axial direction of the branch coating are not arranged in parallel. The connecting coating is in a slope shape, one end of the connecting coating is connected to the edge of the first mounting hole, and the other end is recessed toward the inner side of the main body coating and connected to the edge of one end of the branch coating, the branch coating is arranged on the outside of the connecting coating, and the end of the branch coating away from the connecting coating extends in a direction away from the axis of the main body coating.

[0010] In one embodiment, the medical luminal stent also includes a main support frame, a sub-support frame and a connecting support frame. The main support frame is arranged on the outer surface or inner surface or inside the side wall of the main covering to support the main covering; the sub-support frame is arranged on the outer surface or inner surface or inside the side wall of the branch covering to support the branch covering; the connecting support frame is arranged on the outer surface or inner surface or inside the side wall of the connecting covering to support the connecting covering.

[0011] In one embodiment, the sub-support frames and the connecting films are arranged at intervals.

[0012] In one embodiment, the connecting support frame includes a plurality of bending portions close to the branch covering, and there are at least two bending portions, wherein the distance between one bending portion and the branch covering is smaller than the distance between the other bending portion and the branch covering.

[0013] In one embodiment, the axial angle A between the main coating and the branch coating satisfies: 0° <A<90°。

[0014] In one embodiment, the axial angle A between the main coating and the branch coating satisfies 30°≤A≤60°.

[0015] In one of the embodiments, the axial angle A between the main coating and the branch coating satisfies A=90°.

[0016] In one embodiment, the medical luminal stent further includes a reinforcing connection portion, one end of which is connected to the branch covering, and the other end of which is connected to the connecting covering.

[0017] In one embodiment, the reinforcing connection portion is a reinforcing rib of a strip structure, one end of the reinforcing rib is connected to the end of the branch coating away from the connecting coating, and the other end is connected to the outer ring of the connecting coating away from the branch coating. Alternatively, the reinforcing connection portion is a reinforcing coating of a planar structure, the reinforcing coating is located in a plane formed by the axis of the branch coating and the axis of the main coating, one end of the reinforcing coating is connected to the outer wall of the branch coating along the axial direction of the branch coating, and the other end is connected to the outer wall of the connecting coating along the axial direction of the main coating.

[0018] In one embodiment, the main body covering includes a first end and a second end, and a reinforcing connection portion is provided on one of a side of the branch covering close to the first end or a side of the branch covering close to the second end.

[0019] In one embodiment, the height of one end of the branch film away from the connecting film is less than the surface height of the main film, or the height of one end of the branch film away from the connecting film is equal to the surface height of the main film.

[0020] In one embodiment, along the axial direction of the main body coating, opposite sides of the connecting coating have different slopes, and the distance that the connecting coating on the side with a larger slope extends toward the center line of the main body coating is greater than the distance that the connecting coating on the side with a smaller slope extends toward the center line of the main body coating, so that one side opening of the branch coating connected to the main body coating is inclined toward the inflow direction of body fluid.

[0021] In one embodiment, the main body coating is defined to include a first end and a second end, and the angle value a between the generatrix of the connecting coating near the first end and the axis of the main body coating and the angle value b between the generatrix of the connecting coating near the second end and the axis of the main body coating satisfying that a <b。

[0022] In one of the embodiments, the main body coating is defined to include a first end and a second end, the connecting coating includes a first coating, a third coating, a second coating and a fourth coating arranged in sequence along its own circumference, the first coating is arranged close to the first end, the second coating is arranged close to the second end, and the third coating and the fourth coating are arranged opposite to each other along the radial direction of the main body coating; wherein the slope length of the first coating is not equal to the slope length of the third coating; and / or the slope length of the first coating is not equal to the slope length of the second coating.

[0023] Compared with the prior art, the medical lumen stent provided in the present application has one or more branch coverings, so the medical lumen stent does not need to be opened after being inserted into the main lumen, which not only greatly reduces the difficulty of operation but also can effectively prevent internal leakage of the medical lumen stent itself.

[0024] Furthermore, since the connecting film is sloped, the connecting film is recessed toward the inner side of the main body film, the branch film is arranged on the outer side of the connecting film, and the branch film is connected to the recessed side of the connecting film and extends in a direction away from the axis of the main body film. Therefore, it can be seen that by providing the connecting film recessed inward, the branch film is at least partially arranged in the inner cavity of the main body film, that is, the height of the branch film protruding from the surface of the main body film is greatly reduced, thereby reducing the radial width of the entire medical lumen stent, and facilitating the assembly and transportation of the entire medical lumen stent in the main lumen.

[0025] Furthermore, although the branch coating occupies the inner cavity space of the main coating due to the concave connecting coating, due to the existence of the sloped connecting coating, the inner diameter of the main coating located at the connecting coating changes uniformly. At this time, the body fluid in the main coating will not generate turbulence when flowing through the position of the first mounting hole, thereby not affecting the body fluid in the main coating from entering the branch coating.

[0026] Furthermore, the medical lumen stent in the present application can achieve the entry of body fluids in the main covering into the branch covering without the need for additional diversion sections, so the medical lumen stent in the present application not only greatly reduces the space occupied by the lumen of the main covering, thereby greatly increasing the effective diameter of the medical lumen stent at the distal end of the lumen after reconstruction, but also reduces the stress surface of the branch covering, thereby avoiding the generation of vibration in the first mounting hole area, thereby improving the safety of surgical operation.

[0027] From the above, it can be seen that the medical luminal stent provided in the present application effectively solves the technical defects existing in various solutions in the prior art, greatly improves the operational safety of the surgery, and reduces the operational difficulty of the surgery.

[0028] The most important thing is that since the connecting film is sloped and one end of the connecting film is connected to the edge of the first mounting hole, and the other end is recessed toward the inner side of the main body film and connected to the edge of one end of the branch film, the difference between the area of ​​the first mounting hole and the cross-sectional area of ​​the branch film is smaller than the surface area of ​​the connecting film. It can be understood that, compared with the main body film directly connecting the branch film, by providing the connecting film, the movement range of the branch film can be greatly improved, that is, the branch film can be moved radially along the first mounting hole to facilitate the adjustment of the position of the branch film so that the branch film is aligned with the corresponding branch lumen.

[0029] That is, the medical lumen stent provided in the present application can adapt to various anatomical forms. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 A schematic diagram of the structure of a medical lumen stent according to an embodiment of the present application;

[0032] Figure 2 A schematic diagram of the local structure of a medical lumen stent according to an embodiment of the present application Figure 1 ;

[0033] Figure 3 A schematic diagram of the local structure of a medical lumen stent according to an embodiment of the present application Figure 2 ;

[0034] Figure 4 A schematic diagram of the local structure of a medical lumen stent according to an embodiment of the present application Figure 3 ;

[0035] Figure 5 A schematic diagram of the local structure of a medical lumen stent according to an embodiment of the present application Figure 4 ;

[0036] Figure 6 A schematic diagram of the local structure of a medical lumen stent according to an embodiment of the present application Figure 5 ;

[0037] Figure 7 A schematic diagram of the local structure of a medical lumen stent according to an embodiment of the present application Figure 6 .

[0038] : Figure numerals: 100, main support frame; 200, connecting support frame; 210, first bending unit; 220, second bending unit; 300, main body coating; 310, first end; 320, second end; 400, branch coating; 500, connecting coating; 510, first coating; 520, second coating; 530, third coating; 540, fourth coating; 600, sub-support frame; 700, reference coating; 800, reference support frame; 900, reinforced connection part; 910, reinforced coating. DETAILED DESCRIPTION

[0039] There are many technical solutions for reconstructing branch arteries, but each of them has its own obvious disadvantages. For example, the first solution is a fenestration stent solution, which specifically involves placing a main stent without an opening into the main lumen, and then delivering a hole-making device into the main stent and making a hole (also called a window) in the side wall of the main stent. This arrangement, on the one hand, is difficult to transport the hole-making device, so the operation is difficult, and on the other hand, direct hole-making is likely to reduce the sealing of the hole, which in turn makes the main stent prone to internal leakage.

[0040] In order to solve the problem that the window stent solution is difficult to open and prone to internal leakage, the second solution is to adopt an external branch stent solution, that is, to set one or more external stents protruding from the surface of the main stent on the outer peripheral side of the main stent. However, such a setting increases the radial width of the entire stent, which seriously affects the delivery of the entire stent in the main cavity.

[0041] The third solution is to adopt an internal branch stent solution, that is, to set one or more inwardly protruding inner stents on the inner wall of the main stent. In this way, when the body fluid in the inner cavity of the main stent flows through the inner stent, turbulence will be generated due to the direct blocking effect of the inner stent, which will affect the body fluid in the main stent from entering the inner stent.

[0042] In order to solve the technical problem that body fluids are difficult to enter the inner stent in the third solution, the technicians improved the fourth solution based on the third solution. Specifically, a guide section parallel to the main stent is provided on the basis of the inner stent, and the opening of the guide section is toward the entrance direction of the body fluid, so that the body fluid can smoothly enter the inner stent.

[0043] However, such a configuration not only greatly increases the overall volume of the inner stent, so that more space in the inner cavity of the main stent is occupied, and the effective diameter of the stent at the distal end of the lumen after reconstruction is greatly reduced, but also greatly increases the force-bearing surface of the inner stent, so that the inner stent generates greater vibrations under the impact of body fluids, thereby affecting the safety of surgical operation.

[0044] From the above, it can be seen that the existing first solution, second solution, third solution and fourth solution all have significant defects and cannot meet the requirements of reconstructing branch arteries.

[0045] See also Figure 1-Figure 7In order to solve the technical problems brought about by the four existing solutions, the present application provides a medical lumen stent, which includes a main body coating 300, a branch coating 400 and a connecting coating 500. The main body coating 300 and the branch coating 400 are both cylindrical, and the side wall of the main body coating 300 is provided with one or more first mounting holes, each branch coating 400 is correspondingly arranged at the position where the first mounting hole is located, the diameter of the branch coating 400 is smaller than the inner diameter of the first mounting hole, and the axial direction of the main body coating 300 and the axial direction of the branch coating 400 are not arranged in parallel.

[0046] The connecting film 500 is in a slope shape (including but not limited to a truncated cone shape and a prism shape, etc., which are not listed here one by one), one end of the connecting film 500 is connected to the edge of the first mounting hole, and the other end is recessed toward the inner side of the main body film 300 and connected to the edge of one end of the branch film 400, and the branch film 400 is arranged on the outer side of the connecting film 500 (the side away from the cavity of the main body film 300), and the end of the branch film 400 away from the connecting film 500 extends in a direction away from the axis of the main body film 300.

[0047] It should be noted that the main body coating 300 is disposed in the main lumen, and the branch coating 400 is used to connect the branch lumens, so that the body fluid in the main lumen passes through the main body coating 300 and the branch coating 400 and enters the branch lumen.

[0048] Since the medical luminal stent in the present application has one or more branch coverings 400, the medical luminal stent does not need to be opened after being inserted into the main lumen, which not only greatly reduces the difficulty of operation but also can effectively prevent the internal leakage of the medical luminal stent itself.

[0049] Furthermore, since the connection coating 500 is in a slope shape, the connection coating 500 is recessed toward the inner side of the main coating 300, the branch coating 400 is arranged on the outer side of the connection coating 500, and the branch coating 400 is connected to the recessed side of the connection coating 500 and extends in a direction away from the axis of the main coating 300. Therefore, it can be seen that by providing the connection coating 500 recessed inward, the branch coating 400 is at least partially arranged in the inner cavity of the main coating 300, that is, the height of the branch coating 400 protruding from the surface of the main coating 300 is greatly reduced, thereby reducing the radial width of the entire medical luminal stent and facilitating the assembly and transportation of the entire medical luminal stent in the main cavity.

[0050] Furthermore, although the branch coating 400 occupies part of the inner cavity space of the main coating 300 due to the concave connecting coating 500, due to the existence of the sloped connecting coating 500, the inner diameter of the main coating 300 located at the connecting coating 500 changes uniformly. At this time, the body fluid in the main coating 300 will not generate turbulence when flowing through the position of the first mounting hole, thereby not affecting the body fluid in the main coating 300 from entering the branch coating 400.

[0051] Furthermore, the medical lumen stent in the present application can achieve the entry of body fluid in the main covering 300 into the branch covering 400 without the need for additional diversion sections, so the medical lumen stent in the present application not only greatly reduces the occupancy of the lumen space of the main covering 300, thereby greatly increasing the effective diameter of the medical lumen stent at the distal end of the lumen after reconstruction, but also reduces the force-bearing surface of the branch covering 400, thereby avoiding the generation of vibration in the first mounting hole area, thereby improving the safety of surgical operation.

[0052] From the above, it can be seen that the medical luminal stent provided in the present application effectively solves the technical defects existing in various solutions in the prior art, greatly improves the operational safety of the surgery, and reduces the operational difficulty of the surgery.

[0053] Most importantly, since the connecting film 500 is sloped, and one end of the connecting film 500 is connected to the edge of the first mounting hole, and the other end is recessed toward the inner side of the main body film 300 and connected to the edge of one end of the branch film 400, the difference between the area of ​​the first mounting hole and the cross-sectional area of ​​the branch film 400 is smaller than the surface area of ​​the connecting film 500. It can be understood that, compared with the main body film 300 directly connecting the branch film 400, by providing the connecting film 500, the movement range of the branch film 400 can be greatly improved, that is, the branch film 400 can be moved radially along the first mounting hole to facilitate the adjustment of the position of the branch film 400 so that the branch film 400 is aligned with the corresponding branch lumen.

[0054] That is, the medical lumen stent provided in the present application can adapt to various anatomical forms.

[0055] In one embodiment, if Figure 1 and Figure 2 As shown, the medical luminal stent further includes a main support frame 100, a sub-support frame 600 and a connecting support frame 200. The main support frame 100 is arranged on the outer surface or inner surface or inside the side wall of the main body coating 300 to support the main body coating 300. The sub-support frame 600 is arranged on the outer surface or inner surface or inside the side wall of the branch coating 400 to support the branch coating 400. The connecting support frame 200 is arranged on the outer surface or inner surface or inside the side wall of the connecting coating 500 to support the connecting coating 500.

[0056] Such arrangement, on the one hand, greatly improves the support of the main body coating 300, the branch coating 400 and the connecting coating 500, and prevents the main body coating 300, the branch coating 400 and the connecting coating 500 from deformation and internal leakage. On the other hand, it improves the rigidity of each part of the medical luminal stent, which is beneficial to the movement and adjustment of the overall and local structures of the medical luminal stent.

[0057] However, it is not limited thereto. In other embodiments, the corresponding support structure can be formed by strengthening the structures of the main coating 300 , the branch coating 400 and the connecting coating 500 .

[0058] In one embodiment, if Figure 1 and Figure 2 As shown, the sub-support frames 600 and the connecting films 500 are arranged at intervals.

[0059] With such a configuration, on the one hand, there is no rigid sub-support frame 600 between the branch coating 400 and the connecting coating 500, which facilitates the movement of the branch coating 400 in all directions along the first mounting hole to achieve fine adjustment of the position of the branch coating 400. At this time, the branch coating 400 has a two-stage adjustment mechanism, the first stage is to achieve a larger range of position adjustment of the branch coating 400 through the deformation of the connecting coating 500, and the second stage is to achieve a smaller range of position adjustment of the branch coating 400 in the part of the branch coating 400 where the sub-support frame 600 is not set.

[0060] On the other hand, the sub-support frame 600 is not likely to touch the connection film 500 , thereby improving the durability of the connection film 500 .

[0061] However, it is not limited thereto. In other embodiments, the sub-support frame 600 and the connecting film 500 may also be directly in contact with each other.

[0062] Such a configuration is beneficial to improving the overall support of the branch covering 400 .

[0063] In one embodiment, the axial angle A between the main coating 300 and the branch coating 400 satisfies: 0° <A<90°。

[0064] It is understandable that, in this arrangement, the branch coating 400 and the main body coating 300 are arranged at an angle, which is consistent with the direction of the superselected branch lumen during the operation. Taking the case where the branch coating 400 is inclined toward the first end 310 of the main body coating 300 as an example, at this time, it is only necessary to use a guide wire to extend from the second end 320 of the main body coating 300 toward the first end 310 into the main body coating 300, and the guide wire only needs to rotate a small angle (less than 90 degrees) to extend into the branch coating 400, thereby greatly facilitating the position adjustment of the branch coating 400.

[0065] Preferably, in one embodiment, Figure 3 As shown, the axial angle A between the main coating 300 and the branch coating 400 satisfies 30°≤A≤60°.

[0066] Thus, on one hand, A≤60° can reduce the angle of rotation of the guidewire and facilitate the guidewire to enter the branch coating 400 . On the other hand, A≥30° is conducive to the branch coating 400 connecting to the branch lumen.

[0067] In another embodiment, if Figure 1 and Figure 2 As shown, the axial angle A between the main coating 300 and the branch coating 400 satisfies A=90°.

[0068] Such an arrangement enables the branch covering 400 to face the branch lumen.

[0069] In one embodiment, if Figure 3 As shown, the medical luminal stent further includes a reinforcing connection portion 900 , one end of which is connected to the branch covering 400 , and the other end of which is connected to the connecting covering 500 .

[0070] Such a configuration can greatly enhance the connection strength between the branch coating 400 and the connection coating 500 , prevent the inclination angle of the branch coating 400 relative to the main coating 300 from changing, and thus improve the long-term use stability of the branch coating 400 .

[0071] Furthermore, in one embodiment, the reinforcing connection portion 900 is a reinforcing rib of a strip structure, one end of the reinforcing rib is connected to the end of the branch coating 400 away from the connecting coating 500 , and the other end is connected to the outer circle of the connecting coating 500 away from the branch coating 400 .

[0072] According to the physical relationship between moment and lever arm, such a configuration can maximize the pulling effect of the reinforced connection portion 900 on the branch coating 400 , that is, the inclination angle of the branch coating 400 is more difficult to change.

[0073] In another embodiment, if Figure 3 As shown, the reinforced connection portion 900 is a reinforced coating 910 of a planar structure, and the reinforced coating 910 is located in a plane formed by the axis of the branch coating 400 and the axis of the main coating 300, and one end of the reinforced coating 910 is connected to the outer wall of the branch coating 400 along the axial direction of the branch coating 400, and the other end is connected to the outer wall of the connecting coating 500 along the axial direction of the main coating 300.

[0074] With such configuration, the branch covering film 400 can be subjected to uniform force at various locations, and the branch covering film 400 can be deformed due to uneven force.

[0075] Furthermore, in one embodiment, the reinforcing film 910 is a multi-layer film structure.

[0076] Such an arrangement further improves the connection strength of the reinforced connection portion 900 .

[0077] In one embodiment, if Figure 1 and Figure 3 As shown, the main body coating 300 includes a first end 310 and a second end 320 , and a reinforcing connection portion 900 is provided on one side of the branch coating 400 close to the first end 310 or one side of the branch coating 400 close to the second end 320 .

[0078] That is to say, the reinforcing connection part 900 is only arranged at one end of the branch covering 400 , which not only reduces the difficulty of installing the reinforcing connection part 900 , but also improves the force stability of the branch covering 400 (if both ends are subjected to force, it will be less stable).

[0079] Specifically, in one embodiment, when the axial angle A between the main coating 300 and the branch coating 400 is 90°, the reinforcing connection portion 900 can be disposed on any side of the branch coating 400 .

[0080] When the axial angle A between the main coating 300 and the branch coating 400 is less than 90°, if the branch coating 400 is inclined toward the first end 310, the reinforcing connection portion 900 is disposed on a side of the branch coating 400 close to the first end 310. On the contrary, if the branch coating 400 is inclined toward the second end 320, the reinforcing connection portion 900 is disposed on a side of the branch coating 400 close to the second end 320.

[0081] In one embodiment, if Figure 1-Figure 3 As shown, the height of one end of the branch film 400 away from the connecting film 500 is less than the surface height of the main film 300 , or the height of one end of the branch film 400 away from the connecting film 500 is equal to the surface height of the main film 300 .

[0082] That is, the end of the branch film 400 away from the connecting film 500 does not protrude from the surface of the main film 300 .

[0083] With such arrangement, when the medical tubular lumen stent is installed, the total radial width of the medical tubular lumen stent can be reduced, thereby facilitating the movement of the medical tubular lumen stent in the main lumen.

[0084] In one embodiment, if Figure 1 As shown, the medical luminal stent also includes a reference coating 700 , and the side wall of the main coating 300 is also provided with a second mounting hole. One end of the reference coating 700 is connected to the edge of the second mounting hole, and the other end extends in a direction away from the main coating 300 .

[0085] It should be noted that the reference coating 700 acts as a reference. When installing the medical lumen stent, the reference coating 700 is directly aligned with the corresponding branch lumen, and then the positions of other branch coatings 400 are adjusted. Therefore, the reference coating 700 does not need to be connected to the main coating 300 through the connecting coating 500.

[0086] Further, in one embodiment, if Figure 1 As shown, the medical lumen stent further includes a reference support frame 800 , which is disposed on the outer surface or the inner surface or the inside of the side wall of the reference coating 700 to support the reference coating 700 .

[0087] In one embodiment, if Figure 6 As shown, along the axial direction of the main body coating 300, the opposite sides of the connecting coating 500 have different slopes (i.e., there are at least two values ​​of the angle between the connecting coating 500 and the main body coating 300), and the distance that the connecting coating 500 on the side with a larger slope extends toward the center line (i.e., the axis) of the main body coating 300 is greater than the distance that the connecting coating 500 on the side with a smaller slope extends toward the center line of the main body coating 300, so that the opening of one side of the branch coating 400 connected to the main body coating 300 is inclined toward the inflow direction of the body fluid, so as to guide the body fluid in the cavity of the main body coating 300 (the curve with arrows in the figure) to the cavity of the branch coating 400.

[0088] It should be noted that the “slope” refers to the angle formed by the generatrix connecting the coating 500 and the axis of the main coating 300 .

[0089] Further, in one embodiment, if Figure 6 As shown, the angle value a between the busbar of the connecting film 500 near the first end 310 and the axis of the main body covering film 300, and the angle value b between the busbar of the connecting film 500 near the second end 320 and the axis of the main body covering film 300 satisfy, a <b。

[0090] In one embodiment, if Figure 4-Figure 7 As shown, the connecting film 500 includes a first film 510, a third film 530, a second film 520 and a fourth film 540 arranged in sequence along its own circumference, the first film 510 is arranged close to the first end 310, the second film 520 is arranged close to the second end 320, and the third film 530 and the fourth film 540 are arranged opposite to each other along the radial direction of the main film 300.

[0091] The slope length of the first coating 510 is not equal to the slope length of the third coating 530 .

[0092] It should be noted that “slope length” refers to the length of the busbar connecting the coating 500 .

[0093] It can be understood that by setting different slope lengths, the medical luminal stent can take into account the three aspects of adapting to anatomical morphology, facilitating superselection and diversion performance at the same time.

[0094] Specifically, in one embodiment, the slope length of the first coating 510 is smaller than the slope length of the third coating 530. In another embodiment, the slope length of the first coating 510 is larger than the slope length of the third coating 530.

[0095] In one embodiment, the slope length of the first coating 510 and the slope length of the second coating 520 are not equal.

[0096] Specifically, the slope length of the first coating 510 is smaller than the slope length of the second coating 520 , or the slope length of the first coating 510 is larger than the slope length of the second coating 520 .

[0097] In another embodiment, the slope length of the first coating 510 is equal to the slope length of the second coating 520 .

[0098] In one embodiment, if Figure 4 and Figure 5 As shown, the connecting support frame 200 includes a plurality of bending portions close to the branch coating 400 , and there are at least two bending portions, wherein the distance between one bending portion and the branch coating 400 is smaller than the distance between the other bending portion and the branch coating 400 .

[0099] Specifically, the bending portion includes a first bending unit 210 and a second bending unit 220 , and the first bending unit 210 is closer to the branch coating 400 than the second bending unit 220 .

[0100] It is understandable that the partial bending portion is disposed away from the branch covering 400 so that the branch covering 400 has a relatively easy tilting property (ie, hinge flexibility) in this direction, thereby facilitating superselective operation during surgery.

[0101] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0102] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the scope of patent protection of the present application shall be subject to the attached claims.

[0103] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0104] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0105] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0106] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0107] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0108] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

Claims

1. A medical luminal stent, characterized in that: The invention comprises a main body coating (300), a branch coating (400) and a connecting coating (500), wherein the main body coating (300) and the branch coating (400) are both cylindrical, the side wall of the main body coating (300) is provided with one or more first mounting holes, each branch coating (400) is arranged correspondingly at the position where the first mounting hole is located, the diameter of the branch coating (400) is smaller than the inner diameter of the first mounting hole, and the axial direction of the main body coating (300) and the axial direction of the branch coating (400) are not arranged in parallel; The connecting film (500) is in a slope shape, one end of the connecting film (500) is connected to the edge of the first mounting hole, and the other end is recessed toward the inside of the main film (300) and connected to the edge of one end of the branch film (400), the branch film (400) is arranged on the outside of the connecting film (500), and one end of the branch film (400) away from the connecting film (500) extends in a direction away from the axis of the main film (300); The difference between the area of ​​the first mounting hole and the cross-sectional area of ​​the branch coating (400) is smaller than the surface area of ​​the connecting coating (500), and the branch coating (400) can move radially along the first mounting hole to adjust the position of the branch coating (400).

2. The medical luminal stent according to claim 1, characterized in that: It also includes a main support frame (100), a sub-support frame (600) and a connecting support frame (200), wherein the main support frame (100) is arranged on the outer surface or inner surface or inside the side wall of the main coating (300) to support the main coating (300); the sub-support frame (600) is arranged on the outer surface or inner surface or inside the side wall of the branch coating (400) to support the branch coating (400); and the connecting support frame (200) is arranged on the outer surface or inner surface or inside the side wall of the connecting coating (500) to support the connecting coating (500).

3. The medical luminal stent according to claim 2, characterized in that: The sub-support frame (600) and the connecting film (500) are arranged at intervals.

4. The medical lumen stent according to claim 2, characterized in that: The connecting support frame (200) comprises a plurality of bending portions close to the branch coating (400), and there are at least two of the bending portions, wherein the distance between one of the bending portions and the branch coating (400) is smaller than the distance between another of the bending portions and the branch coating (400).

5. The medical lumen stent according to claim 1, characterized in that: The axial angle A between the main coating (300) and the branch coating (400) satisfies: 0° <A<90°。 6. The medical lumen stent according to claim 5, characterized in that: An axial angle A between the main body coating (300) and the branch coating (400) satisfies the condition of 30°≤A≤60°.

7. The medical luminal stent according to claim 1, characterized in that: The axial angle A between the main coating (300) and the branch coating (400) satisfies A=90°.

8. The medical lumen stent according to claim 1, characterized in that: It also comprises a reinforcing connection portion (900), one end of the reinforcing connection portion (900) being connected to the branch coating (400) and the other end being connected to the connection coating (500).

9. The medical lumen stent according to claim 8, characterized in that: The reinforcing connection portion (900) is a reinforcing rib of a strip structure, one end of the reinforcing rib being connected to an end of the branch coating (400) away from the connecting coating (500), and the other end being connected to an outer ring of the connecting coating (500) away from the branch coating (400); Alternatively, the reinforced connection portion (900) is a reinforced coating (910) of a planar structure, and the reinforced coating (910) is located in a plane formed by the axis of the branch coating (400) and the axis of the main coating (300), and one end of the reinforced coating (910) is connected to the outer wall of the branch coating (400) along the axial direction of the branch coating (400), and the other end is connected to the outer wall of the connecting coating (500) along the axial direction of the main coating (300).

10. The medical lumen stent according to claim 8, characterized in that: The main body coating (300) is defined to include a first end (310) and a second end (320), and the reinforcing connection portion (900) is provided on one of a side of the branch coating (400) close to the first end (310) or a side of the branch coating (400) close to the second end (320).

11. The medical lumen stent according to claim 1, characterized in that: The height of one end of the branch coating (400) away from the connecting coating (500) is less than the surface height of the main coating (300), or the height of one end of the branch coating (400) away from the connecting coating (500) is equal to the surface height of the main coating (300).

12. The medical lumen stent according to claim 1, characterized in that: Along the axial direction of the main body coating (300), the opposite sides of the connecting coating (500) have different slopes, and the distance that the connecting coating (500) on the side with a larger slope extends toward the center line of the main body coating (300) is greater than the distance that the connecting coating (500) on the side with a smaller slope extends toward the center line of the main body coating (300), so that the side opening of the branch coating (400) connected to the main body coating (300) is inclined toward the inflow direction of body fluid.

13. The medical lumen stent according to claim 12, characterized in that: It is defined that the main body coating (300) includes a first end (310) and a second end (320), and the angle value a between the busbar of the connecting coating (500) near the first end (310) and the axis of the main body coating (300) and the angle value b between the busbar of the connecting coating (500) near the second end (320) and the axis of the main body coating (300) satisfy that a <b。 14. The medical lumen stent according to claim 1, characterized in that: The main body coating (300) is defined to include a first end (310) and a second end (320); the connecting coating (500) includes a first coating (510), a third coating (530), a second coating (520), and a fourth coating (540) arranged in sequence along its own circumference; the first coating (510) is arranged close to the first end (310), the second coating (520) is arranged close to the second end (320), and the third coating (530) and the fourth coating (540) are arranged opposite to each other along the radial direction of the main body coating (300); Wherein, the slope length of the first coating (510) is not equal to the slope length of the third coating (530); And / or, the slope length of the first coating (510) and the slope length of the second coating (520) are not equal.

Images