Thrombectomy stent, thrombectomy device and peripheral vascular thrombectomy system

Abstract

The present invention relates to a thrombus removal stent, a thrombus removal device and a peripheral vascular thrombus removal system. The thrombus removal stent is composed of a plurality of coaxially arranged and radially expandable spiral filament structures. The rotation direction of at least one spiral filament structure is opposite to that of the other spiral filament structures. The spiral filament structures with the same rotation direction are axially staggered. The spiral filament structures are staggered to form a mesh structure with dense holes. The above-mentioned thrombus removal stent is composed of a plurality of spiral filament structures of the same diameter. In the expanded and contracted state, it always maintains a regular cylindrical shape, thereby increasing its contact position with the inner wall of the blood vessel, and the dense holes formed by the plurality of spiral filament structures can scrape the inner wall of the blood vessel multiple times, which can effectively improve the removal efficiency and reduce impurity residues.

Description

Technical Field

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

[0002] Thrombi are small pieces of blood formed on the surface of the peeling or repaired parts of the inner surface of the cardiovascular system. At present, the most common way to treat thrombi in blood vessels is to use thrombolytic drugs to dissolve the thrombi, but the treatment time is long, the recanalization rate is low, and there is a risk of bleeding.

[0003] The thrombectomy system uses minimally invasive interventional technology. With the assistance of medical imaging equipment, the thrombectomy system is pushed to the target lesion site through a pre-set microcatheter. The thrombectomy stent in the thrombectomy system is compressed at the end of the microcatheter and released by withdrawing the microcatheter. After the thrombectomy stent is released, the thrombectomy stent wraps the thrombus block in the grid of the thrombectomy stent and fixes it. The thrombectomy stent is withdrawn together with the thrombectomy stent and the thrombus block are recovered into the microcatheter, and the thrombus block is removed from the body through the microcatheter to restore blood vessel patency, thereby achieving the purpose of treatment. However, the current thrombectomy stents are irregular in shape and have fewer contact points with the inner wall of the blood vessel, resulting in incomplete removal and easy residual impurities. Summary of the invention

[0004] The first object of the present invention is to provide a thrombus removal stent to increase its contact position with the inner wall of the blood vessel, improve the removal efficiency, and reduce residual impurities.

[0005] The second object of the present invention is to provide a thrombus removal device and a peripheral vascular thrombus removal system including the above-mentioned thrombus removal stent.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A thrombus removal stent is provided, which is composed of a plurality of coaxially arranged spiral filamentary structures capable of radial expansion and contraction. The rotation direction of at least one of the spiral filamentary structures is opposite to that of the other spiral filamentary structures. The spiral filamentary structures with the same rotation direction are axially staggered. The spiral filamentary structures are staggered to form a mesh structure with dense holes.

[0008] In one embodiment of the present application, the thrombus removal bracket is made of memory alloy.

[0009] A thrombus removal device, comprising:

[0010] A thrombus retrieval stent, wherein the thrombus retrieval stent is any one of the thrombus retrieval stents described above;

[0011] A net bag expansion member, the net bag expansion member can be radially expanded and contracted, and a first end of the net bag expansion member is connected to each of the spiral filamentary structures;

[0012] The traction and fixing component includes a fixing portion and a traction portion, wherein the fixing portion is used to fix the thrombectomy device to the delivery device of the peripheral vascular thrombectomy system, one end of the traction portion is connected to the fixing portion, and the other end of the traction portion can be radially expanded and contracted to be connected to the net bag expansion component.

[0013] In one embodiment of the present application, the net bag expansion component includes:

[0014] An expansion body, the expansion body comprising a plurality of W-shaped pieces arranged along the circumferential direction, the open ends of the W-shaped pieces being sequentially connected to form a ring structure;

[0015] An expansion arm, wherein the first end of the expansion arm is connected to the W-shaped member, and the second end of the expansion arm extends away from the closed end of the W-shaped member and is connected to the thrombus removal bracket.

[0016] In one embodiment of the present application, the first end of the expansion arm is connected to each end of the open end of the W-shaped member and the bottom of two V-shaped grooves of the W-shaped member.

[0017] In one embodiment of the present application, the two ends of the closed end of the W-shaped member are connected by a reinforcing rib.

[0018] In one embodiment of the present application, the fixing portion is annular, and the traction portion includes a plurality of traction wires spaced apart along the circumference of the fixing portion, and two ends of the traction wires are respectively connected to the fixing portion and the closed end of the W-shaped member.

[0019] In one embodiment of the present application, the expansion body and the traction wire are made of memory alloy.

[0020] A peripheral vascular thrombectomy system, comprising:

[0021] A thrombus removal assembly, the thrombus removal assembly comprising a delivery device having a distal end and a proximal end and a thrombus removal device sleeved on the distal end of the delivery device, the thrombus removal device being any one of the above thrombus removal devices;

[0022] A control component, wherein the control component comprises a sleeve, and the sleeve is sleeved on the thrombus removal component to radially shrink the thrombus removal bracket and the net bag expansion member to a preset size, and the sleeve can reciprocate relative to the thrombus removal component.

[0023] In one embodiment of the present application, the delivery device includes a catheter that can be sleeved over a guide wire, the distal end of the catheter is provided with an arrow-shaped structure, the proximal end of the catheter is provided with a control block, and the control block is provided with a stop mating surface for contacting and mating with the control component to prevent relative movement between the control component and the delivery device.

[0024] In one embodiment of the present application, the control component also includes a handle, which is sleeved on the delivery device, the distal end of the sleeve is sleeved on the thrombus removal device and the distal end of the sleeve is wrapped around the maximum outer diameter of the arrow-shaped structure, and the proximal end of the sleeve is connected to the handle.

[0025] It can be seen from the above technical scheme that the present invention discloses a thrombus removal stent, which is composed of a plurality of coaxially arranged and radially expandable and contractible spiral filamentary structures, wherein the rotation direction of at least one spiral filamentary structure is opposite to that of the remaining spiral filamentary structures, and the spiral filamentary structures with the same rotation direction are axially staggered, and the spiral filamentary structures are staggered to form a mesh structure with dense holes.

[0026] The above-mentioned thrombus removal stent is composed of multiple spiral filament structures of the same diameter, and always maintains a regular cylindrical shape in the expanded and contracted state, thereby increasing its contact position with the inner wall of the blood vessel. The dense holes formed by the multiple spiral filament structures can scrape the inner wall of the blood vessel multiple times, which can effectively improve the removal efficiency and reduce residual impurities. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only 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.

[0028] Figure 1 A schematic diagram of the structure of the thrombus removal stent provided in an embodiment of the present invention;

[0029] Figure 2 A schematic diagram of the structure of a thrombus removal device provided in an embodiment of the present invention;

[0030] Figure 3 A schematic structural diagram of a net bag expansion component of a thrombus removal device provided in an embodiment of the present invention;

[0031] Figure 4 A schematic diagram of the structure of a peripheral vascular thrombectomy system provided in an embodiment of the present invention;

[0032] Figure 5 A schematic diagram of the structure of a delivery device of a peripheral vascular thrombectomy system provided in an embodiment of the present invention;

[0033] Figure 6 A schematic diagram of the structure of a control component of a peripheral vascular thrombectomy system provided in an embodiment of the present invention.

[0034] in:

[0035] 1 is a thrombectomy bracket; 101 is a first spiral filamentary structure; 102 is a second spiral filamentary structure; 2 is a net bag expansion member; 201 is an expansion body; 202 is a reinforcing rib; 203 is an expansion arm; 3 is a traction fixing member; 301 is a fixing part; 302 is a traction part; 4 is a delivery device; 401 is a catheter; 402 is an arrow-shaped structure; 403 is a control block; 5 is a control assembly; 501 is a sleeve; 502 is a handle. DETAILED DESCRIPTION

[0036] One of the core aspects of the present invention is to provide a thrombus removal stent, the structural design of which can increase its contact position with the inner wall of the blood vessel, improve the removal efficiency, and reduce impurity residues.

[0037] Another core of the present invention is to provide a thrombus removal device and a peripheral vascular thrombus removal system including the above-mentioned thrombus removal stent.

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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.

[0039] See also Figure 1 , Figure 1 A schematic diagram of the structure of a thrombus removal stent provided in an embodiment of the present invention.

[0040] Disclosed in an embodiment of the present invention is a thrombus removal stent 1, which is composed of a plurality of coaxially arranged and radially expandable spiral filamentary structures, wherein the rotation direction of at least one spiral filamentary structure is opposite to that of the remaining spiral filamentary structures, and the spiral filamentary structures with the same rotation direction are axially staggered, and the spiral filamentary structures are staggered to form a mesh structure with dense holes.

[0041] In a specific embodiment of this case, Figure 1 As shown, the thrombus removal stent 1 is composed of at least one first helical filament structure 101 and at least one second helical filament structure 102 . The first helical filament structure 101 and the second helical filament structure 102 have opposite directions of rotation, and the distal ends of the helical filament structures are intertwined.

[0042] It can be seen that compared with the prior art, the thrombus removal stent 1 provided in the embodiment of the present invention is composed of multiple spiral filamentary structures of the same diameter, and always maintains a regular cylindrical shape in the expanded and contracted state, thereby increasing its contact position with the inner wall of the blood vessel, and the dense holes formed by the multiple spiral filamentary structures can scrape the inner wall of the blood vessel multiple times, which can effectively improve the removal efficiency and reduce residual impurities.

[0043] In the embodiment of the present invention, the thrombus removal stent 1 is made of a memory alloy. The memory alloy is an alloy material that can completely eliminate its deformation at a lower temperature and restore its original shape before deformation after being heated, that is, an alloy with a "memory" effect. The thrombus removal stent 1 made of this material causes little damage to blood vessels and can reduce the damage to blood vessels during the thrombus removal process.

[0044] Based on the above-mentioned thrombus removal bracket 1, the embodiment of the present invention further provides a thrombus removal device, such as Figure 2 As shown, the thrombus removal device comprises a thrombus removal stent 1, a net bag expansion member 2 and a traction fixing member 3, wherein the thrombus removal stent 1 is the thrombus removal stent 1 as described in the above embodiment; the net bag expansion member 2 can expand and contract radially, the first end of the net bag expansion member 2 is connected to each spiral filament structure, and the net bag expansion member 2 mainly plays the role of reinforcing the thrombus removal stent 1 and driving the thrombus removal stent 1 to expand; the traction fixing member 3 comprises a fixing portion 301 and a traction portion 302, the fixing portion 301 is used to fix the thrombus removal device to the delivery device 4 of the peripheral vascular thrombus removal system, one end of the traction portion 302 is connected to the fixing portion 301, and the other end of the traction portion 302 can be radially expanded and contracted and connected to the net bag expansion member 2. Since the thrombus removal device adopts the thrombus removal stent 1 in the above embodiment, the technical effect of the thrombus removal device can refer to the above embodiment.

[0045] like Figure 2 and Figure 3 As shown, in a specific embodiment of the present invention, the net bag expansion component 2 includes an expansion body 201 and an expansion arm 203, wherein the expansion body 201 includes a plurality of W-shaped pieces arranged along the circumferential direction, and the open ends of the W-shaped pieces are connected in sequence to form a radially expandable and contractible annular structure; the first end of the expansion arm 203 is connected to the W-shaped piece, and the second end of the expansion arm 203 extends in a direction away from the closed end of the W-shaped piece and is connected to the thrombus removal bracket 1. When the expansion body 201 expands radially, each expansion arm 203 moves away from each other radially, thereby stretching the above-mentioned thrombus removal bracket 1, so that the thrombus removal bracket 1 fits more closely with the blood vessel wall, and improves the scraping efficiency and scraping effect. Of course, it should be noted that since the thrombus removal bracket 1 is made of memory alloy, it itself can also expand radially after the temperature rises. The expansion arm 203 can provide support for the thrombus removal bracket 1 and make the holes on the thrombus removal bracket 1 more dense, which is conducive to fully scraping the thrombus on the blood vessel wall.

[0046] The net bag expansion component 2 is also made of memory alloy, wherein the diameter of the expansion body 201 is 5mm-16mm and the length is 10mm-20mm, that is, the minimum diameter of the expansion body 201 after contraction is 5mm, and the maximum diameter after expansion is 16mm.

[0047] The above does not have to be straight line, but can have a certain tortuous structure, such as Figure 2 and Figure 3 As shown, the expansion arm 203 passes through the gap of the thrombus removal stent 1 to ensure a relatively stable connection between the expansion arm 203 and the thrombus removal stent 1. The expansion arm 203 can extend to the distal end of the thrombus removal stent 1 and be entangled with the distal ends of each spiral filament structure at the distal end of the thrombus removal stent 1.

[0048] It should be noted that in this case, the near end and the far end are distinguished according to the distance from the user. The near end is short from the user, and the far end is far from the user.

[0049] Specifically, in an embodiment of the present invention, the first end of the expansion arm 203 is connected to each end of the open end of the W-shaped member and the bottom of the two V-shaped grooves of the W-shaped member. It should be noted that the open end of the W-shaped member has three ends, namely, an end shared by the two V-shaped grooves and two ends of the two V-shaped grooves away from each other.

[0050] like Figure 2 As shown, in an embodiment of the present invention, the two ends of the closed end of the W-shaped member are connected by a reinforcing rib 202 to increase the strength of the W-shaped member and reduce the deformation of the closed end of the W-shaped member, so that the W-shaped member forms a conical structure with a small proximal end and a large distal end, which is convenient for pulling out after thrombus removal.

[0051] like Figure 2 As shown, in the embodiment of the present invention, the fixing portion 301 of the traction fixing member 3 is annular, made of stainless steel, with a diameter of 5 mm and an axial length of 3 mm. The traction portion 302 includes a plurality of traction wires arranged at intervals along the circumference of the fixing portion 301. The two ends of the traction wires are respectively connected to the fixing portion 301 and the closed end of the W-shaped part. The traction wires are made of memory alloy, with a diameter of 1 mm and a length of 30 mm.

[0052] Based on the above-mentioned thrombus removal device, the embodiment of the present invention also provides a peripheral vascular thrombus removal system, such as Figure 4 As shown, the peripheral vascular thrombus removal system includes a thrombus removal assembly and a control assembly 5, wherein the thrombus removal assembly includes a delivery device 4 with a distal end and a proximal end and a thrombus removal device sleeved on the distal end of the delivery device 4, and the thrombus removal device is the thrombus removal device as described in the above embodiment; the control assembly 5 includes a sleeve 501, and the sleeve 501 is sleeved on the thrombus removal assembly to radially shrink the thrombus removal bracket 1 and the net bag expansion member 2 to a preset size, and the sleeve 501 can reciprocate relative to the thrombus removal assembly.

[0053] During use, the delivery device 4 delivers the thrombus removal device to a predetermined position. After reaching the predetermined position, the sleeve 501 of the control component 5 moves proximally relative to the thrombus removal component to expose the thrombus removal device. The thrombus removal device expands radially to fit the blood vessel wall, and then the thrombus removal component is pulled outward as a whole to remove the thrombus.

[0054] like Figure 5 As shown, in an embodiment of the present invention, the delivery device 4 includes a catheter 401 that can be sleeved outside the guide wire, the distal end of the catheter 401 is provided with an arrow-shaped structure 402, the proximal end of the catheter 401 is provided with a control block 403, and the control block 403 is provided with a stop mating surface for contacting and cooperating with the control component 5 to prevent the control component 5 and the delivery device 4 from moving relative to each other. When the control component 5 moves proximally relative to the thrombus removal component until it contacts the stop mating surface, the control component 5 continues to be pulled, and the control component 5 can pull out the thrombus removal component as a whole.

[0055] like Figure 6 As shown, in the embodiment of the present invention, the control component 5 further includes a handle 502 for user convenience in holding, the handle 502 is sleeved on the delivery device 4, the distal end of the sleeve 501 is sleeved on the thrombus removal device and the distal end of the sleeve 501 is wrapped around the maximum outer diameter of the arrow-shaped structure 402, the proximal end of the sleeve 501 is connected to the handle 502, the delivery device 4 can pass through the handle 502 and the sleeve 501, and the end of the handle 502 away from the sleeve 501 is used to contact and cooperate with the above-mentioned stop mating surface.

[0056] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0057] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A peripheral vascular thrombectomy system, characterized in that: include: A thrombus removal assembly, the thrombus removal assembly includes a delivery device with a distal end and a proximal end and a thrombus removal device sleeved on the distal end of the delivery device, the delivery device includes a catheter that can be sleeved outside the guide wire, the distal end of the catheter is provided with an arrow-shaped structure, the proximal end of the catheter is provided with a control block, the control block is provided with a stop mating surface for contacting and cooperating with the control assembly to prevent the control assembly and the delivery device from moving relative to each other; the thrombus removal device includes: a thrombus removal bracket, a net bag expansion component and a traction fixing component; the thrombus removal bracket is composed of a plurality of coaxially arranged and radially expandable spiral filamentary structures, at least one of which The rotation direction of the spiral filament structure is opposite to that of the other spiral filament structures, and the spiral filament structures with the same rotation direction are axially staggered, and the spiral filament structures are staggered to form a mesh structure with dense holes; the net bag expansion member can expand and contract radially, and the first end of the net bag expansion member is connected to each of the spiral filament structures; the traction and fixing member includes a fixing part and a traction part, and the fixing part is used to fix the thrombus removal device to the delivery device of the peripheral vascular thrombus removal system, one end of the traction part is connected to the fixing part, and the other end of the traction part can be radially expanded and contracted to connect to the net bag expansion member; A control component, wherein the control component comprises a sleeve, and the sleeve is sleeved on the thrombus removal component to radially shrink the thrombus removal bracket and the net bag expansion member to a preset size, and the sleeve can reciprocate relative to the thrombus removal component.

2. The peripheral vascular thrombectomy system according to claim 1, characterized in that: The thrombus removal bracket is made of memory alloy.

3. The peripheral vascular thrombectomy system according to claim 1, characterized in that: The net bag expansion component comprises: An expansion body, the expansion body comprising a plurality of W-shaped pieces arranged along the circumferential direction, the open ends of the W-shaped pieces being sequentially connected to form a ring structure; An expansion arm, wherein the first end of the expansion arm is connected to the W-shaped member, and the second end of the expansion arm extends away from the closed end of the W-shaped member and is connected to the thrombus removal bracket.

4. The peripheral vascular thrombectomy system according to claim 3, characterized in that: The first end of the expansion arm is connected to each end of the open end of the W-shaped member and the bottom of the two V-shaped grooves of the W-shaped member.

5. The peripheral vascular thrombectomy system according to claim 3, characterized in that: The two ends of the closed end of the W-shaped member are connected by a reinforcing rib.

6. The peripheral vascular thrombectomy system according to any one of claims 3 to 5, characterized in that: The fixing portion is annular, and the traction portion includes a plurality of traction wires spaced apart along the circumference of the fixing portion, and two ends of the traction wires are respectively connected to the fixing portion and the closed end of the W-shaped member.

7. The peripheral vascular thrombectomy system according to claim 6, characterized in that: The expansion body and the traction wire are made of memory alloy.

8. The peripheral vascular thrombectomy system according to claim 1, characterized in that: The control assembly also includes a handle, which is sleeved on the delivery device. The distal end of the sleeve is sleeved on the thrombus removal device and the distal end of the sleeve is wrapped around the maximum outer diameter of the arrow-shaped structure. The proximal end of the sleeve is connected to the handle.

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