Thrombectomy stent and thrombectomy device

Abstract

The present invention relates to the technical field of medical devices, and provides a thrombus removal bracket and a thrombus removal device. The thrombus removal bracket includes a first section and a second section. The first section is tubular, and the first section is provided with a first thrombus removal space and a plurality of first meshes connected to the first thrombus removal space; the second section is connected to one end of the first section, and the second section is tubular, and the second section is provided with a second thrombus removal space and a plurality of second meshes connected to the second thrombus removal space. The second section is provided with a notch extending along its length, and the notch is connected to the second thrombus removal space so that the diameter of the second section can be changed. By setting a notch in the second section so that the diameter of the second section can be changed, the thrombus can be better stabilized and the risk of thrombus removal can be reduced. It can also better adapt to blood vessels of different sizes, and improve the stability and efficiency of thrombus removal.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a thrombus removal bracket and a thrombus removal device. Background Art

[0002] As the main method for treating acute cerebral ischemia at present, stent thrombectomy effectively prolongs the treatment time window, improves the rate of vascular recanalization and reduces the operation time. In related technologies, the size of the thrombectomy stent is usually fixed, which sometimes leads to unstable fit between the thrombectomy stent and the thrombus, resulting in thrombus dislocation or low thrombus removal efficiency. Summary of the invention

[0003] The present invention provides a thrombus removal bracket, which is used to solve the defect of unstable thrombus removal of the thrombus removal bracket in the prior art, and realizes variable thrombus removal space to improve the stability of thrombus removal.

[0004] The present invention provides a thrombus removal stent, comprising:

[0005] A first section, the first section is tubular, and the first section is provided with a first thrombus removal space and a plurality of first mesh holes communicating with the first thrombus removal space;

[0006] The second section is connected to one end of the first section, the second section is tubular, the second section is provided with a second thrombus removal space and a plurality of second mesh holes connected to the second thrombus removal space, the second section is provided with a notch extending along its length direction, the notch is connected to the second thrombus removal space, so that the diameter of the second section can be changed.

[0007] According to a thrombus removal bracket provided by the present invention, the second mesh is formed by enclosing four rib beams, wherein the length of one rib beam is greater than the length of another adjacent rib beam, and the lengths of two rib beams arranged opposite to each other are equal.

[0008] According to a thrombus retrieval bracket provided by the present invention, the thrombus retrieval bracket also includes a connecting rib beam, the two ends of the connecting rib beam are respectively connected to the first section and the second section, and the first section, the second section and the connecting rib beam enclose a receiving groove.

[0009] According to a thrombus removal stent provided by the present invention, the plurality of first meshes include a plurality of first closed-loop meshes and second closed-loop meshes, and the area enclosed by the second closed-loop meshes is larger than the area enclosed by the first closed-loop meshes.

[0010] According to a thrombus removal bracket provided by the present invention, the second closed-loop mesh is formed by a first rib beam, a second rib beam, a third rib beam and a fourth rib beam connected end to end, the connection between the third rib beam and the fourth rib beam is a free end, the lengths of the first rib beam and the second rib beam are equal, the lengths of the third rib beam and the fourth rib beam are equal, and the length of the third rib beam is longer than the length of the first rib beam.

[0011] According to a thrombus removal stent provided by the present invention, there are a plurality of the second closed-loop meshes, and the plurality of the second closed-loop meshes are arranged at intervals in the first section.

[0012] According to the thrombus removal stent provided by the present invention, the first closed-loop mesh is formed by enclosing four rib beams of equal length.

[0013] According to a thrombus removal bracket provided by the present invention, a net bag device is provided at one end of the first section away from the second section, the net bag device is conical and has a net bag space connected to the first thrombus removal space.

[0014] According to a thrombus removal bracket provided by the present invention, a bracket leg is provided at one end of the second section away from the first section, and the bracket leg is used to be connected to an external device.

[0015] The present invention further provides a thrombus removal device, comprising an operating mechanism and the thrombus removal bracket as described above, wherein the thrombus removal bracket is arranged on the operating mechanism.

[0016] The thrombus removal bracket provided by the present invention is configured as a tubular in the first section, and is provided with a first thrombus removal space and a plurality of first meshes connected to the first thrombus removal space. When removing the thrombus, the thrombus can enter the first thrombus removal space through the first mesh to achieve thrombus removal. At the same time, a second section is provided to be connected to the first section, and the thrombus can also enter the second thrombus removal space through the second mesh to complete the thrombus removal. In addition, the second section is provided with a notch extending along its length direction. When the thrombus removal bracket is extended into the blood vessel, the tubular second section can be curled and contracted accordingly to partially overlap. At this time, the diameter of the second section is reduced, which can better stabilize the thrombus and reduce the risk of thrombus removal. It can also better adapt to blood vessels of different sizes to improve the stability and efficiency of thrombus removal. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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.

[0018] Figure 1 is a schematic diagram of the structure of the thrombus removal stent provided by the present invention;

[0019] Figure 2 is a schematic diagram of the unfolded structure of the thrombus removal stent provided by the present invention;

[0020] Figure 3 The thrombus removal stent provided by the present invention is in a natural state. Figure 1 Cross-sectional view in the A direction;

[0021] Figure 4 The thrombus removal stent provided by the present invention is in a working state Figure 1 Cross-sectional view in the A direction;

[0022] Figure 5 is a partial enlarged view of the thrombus removal stent provided by the present invention;

[0023] Figure 6 is a schematic structural diagram of the second mesh in the thrombus removal stent provided by the present invention;

[0024] Figure 7 is a schematic structural diagram of a first closed-loop mesh in the thrombus removal stent provided by the present invention;

[0025] Figure 8 It is a schematic structural diagram of the second closed-loop mesh and the open-loop mesh in the thrombus removal stent provided by the present invention;

[0026] Fig. 9 It is a partial enlarged view of the thrombus removal bracket provided by the present invention connected to the rib beam;

[0027] Fig.10 yes Figure 1 Cross-sectional view along the B direction.

[0028] Reference numerals:

[0029] 100. Thrombectomy stent; 1. First section; 11. First closed-loop mesh; 12. Second closed-loop mesh; 121. First rib beam; 122. Second rib beam; 123. Third rib beam; 124. Fourth rib beam; 125. Second developing device; 13. Third developing device; 14. Open-loop mesh; 2. Second section; 21. Notch; 22. Second mesh; 23. Fourth developing device; 3. Connecting rib beam; 31. First developing device; 4. Receiving groove; 5. Net bag device; 6. Stent leg; 200. Thrombus. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] Please refer to Figures 1 to 4 The present invention provides a thrombus removal bracket 100, comprising a first section 1 and a second section 2, wherein the first section 1 is tubular, and is provided with a first thrombus removal space and a plurality of first mesh holes connected to the first thrombus removal space; the second section 2 is connected to one end of the first section 1, and is tubular, and is provided with a second thrombus removal space and a plurality of second mesh holes 22 connected to the second thrombus removal space, and the second section 2 is provided with a notch 21 extending along its length direction, and the notch 21 is connected to the second thrombus removal space, so that the diameter of the second section 2 can be changed.

[0032] It should be noted that the first section 1 is the front section, which extends into the blood vessel, and the second section 2 is the rear section. The second section 2 is connected with the push wire to form a thrombus removal system to drive the thrombus removal stent 100 to move in the blood vessel to complete the thrombus removal.

[0033] The thrombus removal bracket 100 provided by the present invention is configured as a tubular first section 1, and is provided with a first thrombus removal space and a plurality of first meshes connected to the first thrombus removal space. When removing the thrombus, the thrombus 200 can enter the first thrombus removal space through the first mesh to achieve thrombus removal. At the same time, the second section 2 is connected to the first section 1, and the thrombus 200 can also enter the second thrombus removal space through the second mesh 22 to complete the thrombus removal. In addition, the second section 2 is provided with a notch 21 extending along its length direction. When the thrombus removal bracket 100 is extended into the blood vessel, the tubular second section 2 can be curled and contracted accordingly to partially overlap. At this time, the diameter of the second section 2 is reduced, which can better stabilize the thrombus 200 and reduce the risk of thrombus removal. It can also better adapt to blood vessels of different sizes to improve the stability and efficiency of thrombus removal.

[0034] In this embodiment, the thrombus removal stent 100 is formed by laser engraving a seamless nickel-titanium tube and then heat-setting. It is surrounded by a plurality of ribs to form a tubular structure, and the plurality of ribs are surrounded by a plurality of meshes to allow the thrombus 200 to enter the thrombus removal space, which can be the first thrombus removal space or the second thrombus removal space. It can be understood that the notch 21 extends from one end of the second section 2 to the other end, so that the second section 2 can be unfolded or curled into a tubular shape. In this way, the second section 2 can adjust its own diameter according to the size of the blood vessel. The more the second section 2 curls and overlaps, the smaller the diameter of the second section 2, which can improve the ability to capture the thrombus 200.

[0035] Illustratively, the end of the second section 2 away from the first section 1 is a conical structure, and its unfolded structure is a triangular shape, so as to shrink and gather the end of the second section 2 away from the first section 1 to prevent the thrombus from escaping from there, thereby improving the efficiency of thrombus removal. At the same time, it is also convenient for the second section 2 to be connected to an external structure, such as a push wire.

[0036] Please refer to Figure 2 and Figure 6 According to a thrombus removal stent 100 provided by the present invention, the second mesh 22 is formed by enclosing four ribs, wherein the length of one rib is greater than the length of another adjacent rib, and the lengths of two oppositely arranged ribs are equal.

[0037] It is understandable that the second mesh 22 is a parallelogram with unequal adjacent sides and equal opposite sides, and the plurality of second meshes 22 are arranged in a staggered spiral in the length direction of the second section 2, so that the second section 2 can curl and adjust its own diameter. It is understandable that the second section 2 is tapered at one end away from the first section 1, and can curl in a spiral when the second section 2 curls to partially overlap, which is easier than curling directly toward the center line of the second section 2. Optionally, the length of the long rib beam is 1.15 to 1.5 times the length of the short rib beam, preferably 1.2 to 1.3 times. Figure 6 As shown, the acute angle a formed by the two diagonals of the second mesh 22 is 60° to 85°, preferably 75° to 80°. The closer the two diagonals of the second mesh 22 are to verticality, the larger the size of the second mesh 22 is, so that the thrombus 200 can pass through the second mesh 22 more easily.

[0038] Please refer to Figure 1 and Figure 5 According to a thrombus removal bracket 100 provided by the present invention, the thrombus removal bracket 100 also includes a connecting rib beam 3, the two ends of the connecting rib beam 3 are respectively connected to the first section 1 and the second section 2, and the first section 1, the second section 2 and the connecting rib beam 3 enclose a receiving groove 4.

[0039] In this embodiment, the periphery of the first section 1 and the second section 2 of the rib beam 3 are connected to form a receiving groove 4, and the receiving groove 4 between the first section 1 and the second section 2 is conducive to the entry of the large thrombus 200, thereby ensuring the integrity of the large thrombus 200 and reducing the risk of escaping the thrombus 200. Optionally, the receiving groove 4 is connected to one end of the first thrombus removal space, so that the large thrombus 200 entering the receiving groove 4 is conducive to entering the first thrombus removal space, the thrombus removal is more stable, and the risk of thrombus dislodgement is reduced.

[0040] like Fig. 9As shown, according to a thrombus removal bracket 100 provided by the present invention, a first developing device 31 is provided at the connecting rib beam 3. It can be understood that the first developing device 31 can be fixed in the connecting rib beam 3 by embedding. For example, a mounting hole or a mounting groove is provided in the connecting rib beam 3, and the first developing device 31 is accommodated and limited in the mounting hole or the mounting groove. The first developing device 31 can be in a block or column shape, and of course, it can also be a spring, which is not limited here, as long as the developing effect can be achieved, so as to facilitate the observation of the relative position of the thrombus removal bracket 100 through an external device during the thrombus removal process. Optionally, the material of the first developing device 31 is gold, tantalum, gold-tin alloy, platinum, which is not limited here, and gold is preferably used for better developing effect.

[0041] like Figure 2 As shown, according to a thrombus removal stent 100 provided by the present invention, the plurality of first meshes include a plurality of first closed-loop meshes 11 and second closed-loop meshes 12, and the area enclosed by the second closed-loop meshes 12 is larger than the area enclosed by the first closed-loop meshes 11. In this embodiment, a larger thrombus 200 can enter the first thrombus removal space through the second closed-loop meshes 12, and a smaller thrombus 200 can enter the first thrombus removal space through the first closed-loop meshes 11. It can be understood that the number of the first closed-loop meshes 11 is large, that is, the number of meshes with smaller sizes is large, which reduces the probability of thrombus 200 escaping, and the large thrombus 200 can enter the first thrombus removal space through the second closed-loop meshes 12.

[0042] like Figure 8 As shown, according to a thrombus removal bracket 100 provided by the present invention, the second closed-loop mesh 12 is formed by a first rib beam 121, a second rib beam 122, a third rib beam 123 and a fourth rib beam 124 connected end to end, and the connection between the third rib beam 123 and the fourth rib beam 124 is a free end.

[0043] In this embodiment, the connection between the third rib beam 123 and the fourth rib beam 124 is in a free state and is not fixed. Therefore, at the position of the third rib beam 123 and the fourth rib beam 124 in the first section 1, there are fewer connection structures, lower rigidity, and easier to bend. In this way, during the thrombus removal process, it is easier for the first section 1 to bend through the tortuous blood vessels, thereby improving the ability of the thrombus removal stent 100 to pass through the tortuous blood vessels and improving the thrombus removal efficiency. It can be understood that the third rib beam 123 and the fourth rib beam 124 are combined with the rib beams that form the first closed-loop mesh 11 to form an open-loop mesh 14. Since the third rib beam 123 and the fourth rib beam 124 are in a free state, the area enclosed by the open-loop mesh 14 can change with the movement of the third rib beam 123 and the fourth rib beam 124. It can be understood that the second closed-loop mesh 12 is adjacent to the open-loop mesh 14 to form a mixed mesh. In this way, the thrombus 200 can enter the first thrombus removal space from the open-loop mesh 14 by squeezing the third rib beam 123 and the fourth rib beam 124 to improve the thrombus removal efficiency.

[0044] like Figure 2 As shown, according to a thrombus removal stent 100 provided by the present invention, the number of the second closed-loop meshes 12 is multiple, and the multiple second closed-loop meshes 12 are arranged at intervals in the first section 1. Optionally, the number of the second closed-loop meshes 12 is four, and the four second closed-loop meshes 12 are divided into two groups, and the two groups of second closed-loop meshes 12 are symmetrically arranged about the central axis of the first section 1 to improve the bendability of the first section 1.

[0045] like Figure 8 As shown, according to a thrombus removal stent 100 provided by the present invention, the lengths of the first rib beam 121 and the second rib beam 122 are equal, the lengths of the third rib beam 123 and the fourth rib beam 124 are equal, and the length of the third rib beam 123 is longer than the length of the first rib beam 121. Optionally, the length of the third rib beam 123 is 1.5 to 1.8 times the length of the first rib beam 121. It can be understood that the lengths of the third rib beam 123 and the fourth rib beam 124 are both longer, which is conducive to the thrombus removal stent 100 to stabilize the thrombus 200 when passing through a tortuous blood vessel and reduce the risk of thrombus removal.

[0046] According to the thrombus removal bracket 100 provided by the present invention, a second developing device 125 is provided at the free end.

[0047] It can be understood that the second developing device 125 can be fixed at the connection between the third rib beam 123 and the fourth rib beam 124 by embedding. For example, a mounting hole or mounting groove is provided at the connection between the third rib beam 123 and the fourth rib beam 124, and the second developing device 125 is accommodated and limited in the mounting hole or mounting groove. The second developing device 125 can be in a block or column shape, and of course, it can also be a spring, which is not limited here, as long as the developing effect can be achieved, so that the relative position of the thrombus removal bracket 100 can be observed through an external device during the thrombus removal process. Optionally, the material of the second developing device 125 is gold, tantalum, gold-tin alloy, platinum, which is not limited here, and gold is preferably used for better developing effect.

[0048] like Figure 7 As shown, according to a thrombus removal stent 100 provided by the present invention, the first closed-loop mesh 11 is formed by four ribs of equal length. In this embodiment, the shape of these ribs is a sine wave and the length is equal. The angle θ between the ribs of the first closed-loop mesh 11 and its longitudinal axis is 25° to 65°, preferably 30° to 60°.

[0049] Please refer to Figure 1 , Figure 2 and Fig.10According to a thrombus removal stent 100 provided by the present invention, a net bag device 5 is provided at one end of the first section 1 away from the second section 2. The net bag device 5 is conical and is provided with a net bag space connected to the first thrombus removal space. In this embodiment, the net bag device 5 has the function of intercepting the thrombus dislodged, thereby improving the efficiency of thrombus removal. The ribs are of equal length and are connected at the head and tail in a staggered manner. When removing the thrombus 200, the net bag device 5 can hold the thrombus 200 and capture the escaped thrombus 200 for a second time, thereby preventing the thrombus 200 from escaping to the distal end of the blood vessel and causing secondary damage to the patient.

[0050] like Figure 1 As shown, according to a thrombus removal stent 100 provided by the present invention, a third developing device 13 is provided at one end of the first section 1 away from the second section 2; Figure 5 As shown, optionally, a fourth developing device 23 is provided at one end of the second section 2 adjacent to the first section 1 .

[0051] It is understandable that the third developing device 13 and the fourth developing device 23 can be fixed by embedding. For example, a mounting hole or mounting groove is provided at one end of the first section 1 away from the second section 2, and the third developing device 13 is accommodated and limited in the mounting hole or mounting groove. The third developing device 13 and the fourth developing device 23 can be block-shaped or column-shaped. Of course, they can also be springs, which are not limited here, as long as the developing effect can be achieved, so that the relative position of the thrombus removal bracket 100 can be observed through external equipment during the thrombus removal process. Optionally, the third developing device 13 and the fourth developing device 23 are made of gold, tantalum, gold-tin alloy, platinum, which are not limited here, and gold is preferred for better developing effect. It is understandable that the thrombus removal bracket 100 is provided with multiple developing devices. During the thrombus removal operation, the doctor can clearly know the release position of the thrombus removal bracket 100 through the design of the developing device, which is beneficial to the doctor's surgical operation and judgment, and is beneficial to improving the efficiency of thrombus removal.

[0052] like Figure 1 As shown, according to a thrombus removal stent 100 provided by the present invention, a stent leg 6 is provided at one end of the second section 2 away from the first section 1, and the stent leg 6 is used to connect with an external device. In this embodiment, the length of the stent leg 6 is 1 mm to 2 mm, and the width is 0.2 mm to 0.3 mm, so as to facilitate connection with an external push wire or other structure.

[0053] The present invention also provides a thrombus removal device, comprising an operating mechanism and the above thrombus removal bracket 100, wherein the thrombus removal bracket 100 is arranged on the operating mechanism. It can be understood that the thrombus removal bracket 100 is controlled by the operating mechanism to move in the blood vessel to complete the thrombus removal.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A thrombus removal stent, characterized in that: The thrombus removal stent comprises: A first section, the first section is tubular, and the first section is provided with a first thrombus removal space and a plurality of first mesh holes communicating with the first thrombus removal space; The second section is connected to one end of the first section, the second section is tubular, the second section is provided with a second thrombus removal space and a plurality of second meshes connected to the second thrombus removal space, the second section is provided with a notch extending along the length direction thereof, the notch is connected to the second thrombus removal space, so that the diameter of the second section can be changed; The plurality of first meshes include a plurality of first closed-loop meshes and second closed-loop meshes, and an area enclosed by the second closed-loop meshes is larger than an area enclosed by the first closed-loop meshes; The second closed-loop mesh is formed by a first rib beam, a second rib beam, a third rib beam and a fourth rib beam connected end to end, the connection between the third rib beam and the fourth rib beam is a free end, the first rib beam and the second rib beam are equal in length, the third rib beam and the fourth rib beam are equal in length, and the length of the third rib beam is longer than that of the first rib beam; The first section is the front section, and the second section is the back section. The first section extends into the blood vessel. The first section has a lower rigidity and can easily bend and pass through a tortuous blood vessel.

2. The thrombus removal stent according to claim 1, characterized in that: The second mesh is formed by enclosing four rib beams, wherein the length of one rib beam is greater than the length of another adjacent rib beam, and the lengths of two rib beams arranged opposite to each other are equal.

3. The thrombus removal stent according to claim 1, characterized in that: The thrombus removal bracket also includes a connecting rib beam, the two ends of which are respectively connected to the first section and the second section, and the first section, the second section and the connecting rib beam are enclosed to form a receiving groove.

4. The thrombus removal stent according to claim 1, characterized in that: There are multiple second closed-loop meshes, and the multiple second closed-loop meshes are arranged at intervals in the first section.

5. The thrombus removal stent according to claim 1, characterized in that: The first closed-loop mesh is formed by enclosing four rib beams of equal length.

6. The thrombus removal stent according to any one of claims 1 to 5, characterized in that: A net bag device is provided at one end of the first section away from the second section. The net bag device is conical and is provided with a net bag space communicated with the first thrombus removal space.

7. The thrombus removal stent according to any one of claims 1 to 5, characterized in that: A bracket leg is provided at one end of the second section away from the first section, and the bracket leg is used to connect to an external device.

8. A thrombus removal device, characterized in that: The invention comprises an operating mechanism and a thrombus retrieval bracket according to any one of claims 1 to 7, wherein the thrombus retrieval bracket is arranged on the operating mechanism.

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