Thrombectomy and protection device

Abstract

The invention relates to the technical field of medical instruments, and discloses a thrombus extraction and protection device which comprises a delivery part and a thrombus extraction part, the delivery part comprises a metal tube and a catheter, the thrombus extraction part comprises a resorption part and a thrombus breaking part, the near end of the resorption part is connected with the far end of the catheter, and the near end of the thrombus breaking part is fixedly connected with the far end of the metal tube. A metal core wire is movably sleeved with the metal tube, and the metal core wire extends from the near end to the back suction part at the far end in the axial direction of the metal tube and then is movably connected with the bolt breaking part and the bolt blocking part in sequence. The far end of the back suction piece is of a horn mouth structure; the bolt breaking piece is of a structure with two closed ends, and the metal core wire sequentially penetrates through the center of the near end and the center of the far end of the bolt breaking piece. The plug blocking piece is of a structure with two closed ends, and the metal core wire sequentially penetrates through the center of the near end and the center of the far end of the plug blocking piece. According to the invention, firm thrombus inlaying and destroying are realized through active intervention of an operator, a tiny thrombus capturing function is realized, and the method has important significance for breaking through the clinical application bottleneck of an ADVANCE technology and improving the treatment effect of acute ischemic stroke.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and more particularly to a thrombus removal and protection device. Background Art

[0002] Among cerebrovascular diseases, acute ischemic stroke has a long-standing high incidence and is a key area of clinical treatment. Currently, interventional treatments for this condition include single-stent thrombectomy, dual-stent thrombectomy, aspiration thrombectomy, and combined stent and aspiration thrombectomy. Among these, mechanical aspiration thrombectomy (ADVANCE technology) is gaining widespread market recognition due to its high thrombectomy efficiency and first-pass recanalization rates.

[0003] However, in clinical applications, existing technologies have obvious defects: the suction catheter and thrombectomy stent need to reach the lesion location separately, and then suction or mechanical thrombectomy operations are performed to achieve vascular recanalization. The separate placement of the suction catheter and stent means that different pathways need to be built to deliver the corresponding instruments. This process significantly prolongs the preparation time before thrombectomy, which not only affects the timeliness of treatment, but may also have an adverse effect on postoperative recovery.

[0004] Current mechanical thrombectomy stents are mostly cutting stents to achieve the effect of embedding and removing the thrombus. However, for thrombi that are large or closely attached to the blood vessel wall, the success rate of one-time thrombectomy with such stents is low, and it is difficult to completely remove the blocked thrombi. More importantly, existing devices generally lack an effective capture mechanism for escaping tiny emboli, and there is a potential risk of distal vascular embolism. Moreover, the embedding and thrombectomy of the stent rely more on the stent structure design, and it is difficult to achieve a more ideal thrombectomy operation through operator interaction. In addition, some braided thrombectomy stents (such as Tigertriever) do not have the ability to self-expand, and the fixation effect of the thrombus is highly dependent on the operator's operational intervention. They fail to give full play to the superelastic advantage of nickel-titanium materials, limiting the controllability and stability of the thrombectomy operation.

[0005] In terms of suction thrombectomy technology, the suction effect is limited by the inner lumen size of the suction catheter. In order to achieve ideal thrombus suction, clinical practice often requires repeated application of negative pressure, which not only increases the complexity of the operation, but also places higher requirements on continuous suction at the lesion location. Therefore, the removal of larger or firm emboli and the capture of escaping tiny emboli have become key technical bottlenecks in mechanical thrombectomy technology. Summary of the Invention

[0006] In view of this, the present invention provides a thrombus removal and protection device that can achieve firm thrombus embedding and destruction through active intervention by the operator, and at the same time has the function of capturing tiny emboli. It has important practical significance for breaking through the clinical application bottleneck of existing ADVANCE technology and improving the treatment effect of acute ischemic stroke.

[0007] To achieve the above-mentioned objectives, the present invention provides a thrombus removal and protection device, comprising a delivery member and a thrombus removal member, wherein the delivery member comprises a metal tube and a catheter, the metal tube being movably sleeved inside the catheter, the thrombus removal member comprising a reabsorption member and a thrombus-breaking member, the proximal end of the reabsorption member being connected to the distal end of the catheter, the proximal end of the thrombus-breaking member being fixedly connected to the distal end of the metal tube, a metal core wire being movably sleeved inside the metal tube, the metal core wire extending axially from the proximal end to the reabsorption member at the distal end, and then movably connecting to the thrombus-breaking member and the thrombus-blocking member in sequence;

[0008] The distal end of the re-absorption member is a bell-mouth structure, and the outer diameter of the bell-mouth is larger than the outer diameter of the proximal end of the re-absorption member;

[0009] The bolt-breaking member is a structure with closed ends. The metal core wire passes through the proximal and distal centers of the bolt-breaking member in sequence. The circumferential twisting and forward and backward movement of the bolt-breaking member are achieved by manipulating the proximal end of the metal tube.

[0010] The blocking member is a structure with closed ends. The metal core wire passes through the proximal and distal centers of the blocking member in sequence, and axial pushing and pulling are achieved through the axial movement of the metal core wire.

[0011] Preferably, the number of wire heads of the re-absorption member is m, 6<m<96, and m is an even number, and the wire diameter of the re-absorption member is d1, 0.0005inch<d1<0.005inch.

[0012] Preferably, the bolt-breaking member is a lantern-shaped structure formed by weaving, the number of wire ends of the bolt-breaking member is n, 12≤n≤96, and n is an even number, and the wire diameter of the bolt-breaking member is d2, 0.0005 inch<d2<0.005 inch.

[0013] Preferably, the bolt-breaking member is a square twisted wire structure, the number of wire heads of the bolt-breaking member is k, 4≤k≤24, and k is an even number, and the wire diameter of the bolt-breaking member is d3, 0.0005inch<d3<0.005inch.

[0014] Preferably, both ends of the bolt-breaking member are provided with X-ray-opaque marking points, and the proximal end of the bolt-breaking member is connected to the distal end of the metal tube by welding, bonding, metal ring crimping or polymer heat shrinkage.

[0015] Preferably, both ends of the blocking member are provided with X-ray-opaque marking points, the blocking member is an umbrella-shaped hollow structure formed by weaving, the number of wire heads of the blocking member is s, 12≤s≤96, and s is an even number, and the wire diameter of the blocking member is d4, 0.0005inch<d4<0.005inch.

[0016] Preferably, the surface of the metal tube is provided with spiral cutting patterns, the spiral cutting patterns are variable pitch structures, and the groove width of the spiral cutting patterns on the surface of the metal tube is t, 0.02mm<t<0.1mm.

[0017] Preferably, the proximal pitch of the spiral cutting pattern is p, p=a*t, wherein a≥5, and a is a positive integer, and the distal pitch of the spiral cutting pattern is p'=p / b, b>1.

[0018] Preferably, the metal core wire is a variable diameter structure, with a proximal wire diameter of 0.3 to 0.6 mm and a distal wire diameter of 0.05 to 0.15 mm.

[0019] Preferably, the re-sucking piece is an extension of the middle braided layer of the catheter and is formed by heat treatment; or the re-sucking piece is connected to the catheter by bonding, welding, or pressing.

[0020] Through the above technical solutions, it can be seen that compared with the existing technology, the thrombus removal and protection device provided by the present invention can improve the efficiency of thrombus removal and thrombus capture through large-caliber suction, mechanical thrombus breaking, and capture of escaped emboli, thereby increasing the rate of blood vessel recanalization and reducing the probability of postoperative complications in patients: First, during emergency thrombus removal, the time for pathway construction and instrument placement is reduced, minimizing the impact of the disease on the patient; secondly, the distal end of the reabsorption component is a trumpet-shaped woven structure to provide a greater suction negative pressure during the suction process, so as to fully reabsorb the embolus; then, the embolus-breaking component can achieve axial forward and backward pushing and pulling and circumferential rotation to destroy large, solid emboli and pull them back into the suction catheter; finally, during the suction and mechanical thrombus breaking process, the tiny escaped emboli generated are captured by the closed umbrella-shaped embolus-blocking component woven at the distal end, and are withdrawn together with the embolus-breaking component to be removed from the body. In addition, the present invention also has the following characteristics:

[0021] 1. The integrated design reduces the difficulty of positioning and reduces the operation time, thus improving the efficiency of the operation and ensuring the window period for emergency thrombectomy.

[0022] 2. The large inner cavity with a bell-shaped mouth at the distal end increases the suction negative pressure and better achieves the capture of plaques;

[0023] 3. The mechanical thrombectomy system is equipped with an embolus capture mechanism, which reduces the risk of embolus escape and distal vascular occlusion caused by thrombectomy.

[0024] 4. Mechanical thrombectomy increases the operator's intervention structure, breaking and entrapping the thrombus through twisting, pushing and pulling, thereby improving the efficiency of thrombectomy;

[0025] 5. The lantern-shaped design of the embolus breaker can block blood flow, thereby preventing the impact of blood flow on embolus removal efficiency and preventing tiny emboli from being flushed to the distal end;

[0026] 6. The delivery device adopts a variable pitch spiral cutting structure to improve the twist control and manipulation capabilities, and the mechanical thrombectomy process increases the surgeon's intervention. 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 following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0028] Figure 1 This is an overall structural diagram of the thrombus removal and protection device of the present invention;

[0029] Figure 2 This is a structural diagram of the thrombus-trapping member of the present invention after it captures the thrombus;

[0030] Figure 3 Schematic diagram of the structure of the re-absorption member of the present invention, wherein (A) is a perspective view, (B) is a front view, and (C) is a right side view;

[0031] Figure 4 This is an enlarged view of the braided structure of the retractable element of the present invention, wherein (A) is a 1-on-2 braided structure and (B) is a 1-on-1 braided structure.

[0032] Figure 5 Schematic diagram of the retraction member of the present invention having a twisted wire braided structure;

[0033] Figure 6 Schematic diagram of a lantern-shaped structure of a bolt-breaking member of the present invention, wherein (A) is a perspective view, (B) is a front view, and (C) is a right side view;

[0034] Figure 7 This is a schematic diagram of the bolt-breaking member of the present invention having a square screw-thread structure;

[0035] Figure 8 Schematic diagram of the structure of the blocking bolt of the present invention, wherein (A) is a perspective view, (B) is a left side view, (C) is a front view of one state, and (D) is a front view of another state;

[0036] Figure 9 A schematic diagram of a bolt block including a straight section structure according to the present invention;

[0037] Figure 10 Schematic diagram of the eccentric structure and curvature structure of the blocking member of the present invention, wherein (A) is the main view, and (B) is a schematic diagram of the blocking member fitting against the blood vessel wall;

[0038] Figure 11 It is a structural diagram of the metal tube of the present invention;

[0039] Figure 12 This is a structural diagram of the assembly of the thrombus removal and protection device and the handle of the present invention;

[0040] Figure 13 Schematic diagram of the process of thrombus capture by the thrombus removal and protection device of the present invention.

[0041] Explanation of the reference numerals: metal core wire -1, metal tube -2, catheter -3, suction part -4, bolt-breaking part -5, bolt-blocking part -6, handle -7. DETAILED DESCRIPTION

[0042] 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. The following description of an exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0043] like Figure 1-Figure 2 As shown, the thrombus removal and protection device provided by the present invention is a pre-loaded design, consisting of a delivery component and a thrombus removal component, wherein: the delivery component consists of a metal core wire 1, a metal tube 2 and a catheter 3, the metal tube 2 is movably sleeved inside the catheter 3, the metal core wire 1 is movably sleeved inside the metal tube 2, and the thrombus removal component consists of a resorption component 4, a thrombus-breaking component 5 and a thrombus-blocking component 6. The thrombus removal component adopts a braided structure and is pre-loaded in the lumen of the delivery component, which reduces the intraoperative assembly time and reduces the risk of infection, ensuring that the components maintain a precise coordinated state during the delivery process.

[0044] The metal core wire 1 is made of nickel titanium or stainless steel and is a variable diameter design. The proximal wire diameter is between 0.3 and 0.6 mm. The large diameter design provides stable control support to ensure that the operator can accurately transmit torque. The distal wire diameter is between 0.05 and 0.15 mm. With the ultra-fine diameter structure, the distal compliance of the blood vessel is enhanced, and it can adaptively pass through the tortuous blood vessel segment to reduce the risk of endothelial damage. The outer diameter of the resuscitation piece 4 is D 回吸 ≥External diameter D of bolt 6 拦栓 ≥Outer diameter D of bolt 5 破栓 , forming a gradient thrombus interception structure. The outer diameter that changes continuously from the proximal end to the distal end can realize the multi-level functions of large thrombus capture, broken thrombus interception and micro-thrombus protection.

[0045] The metal tube 2 can be made of stainless steel or nickel titanium, and its surface has spiral cutting lines (such as Figure 11As shown), and it is a variable pitch design to improve its flexibility and torque control ability while also having support ability; the groove width on the surface of the metal tube 2 is t, 0.02mm<t<0.1mm, the proximal pitch of the spiral cutting pattern is p, p=a*t, the proximal pitch p and the groove width t are integer multiples, and its coefficient is a, where a≥5, a is a positive integer, the distal pitch p'=p / b, the distal pitch p' is less than the proximal pitch p, b is the pitch coefficient, b>1, the axial support stiffness is improved by the proximal sparse pitch structure to ensure that the catheter does not collapse during the pushing process, and the distal dense pitch design enhances the flexibility and torque control accuracy of the catheter, so that the device can accurately navigate along the natural bending path of the blood vessel, the outer diameter of the metal tube 2 is 0.35~0.85mm, which is suitable for blood vessels of different diameters from intracranial arteries to peripheral arteries.

[0046] like Figure 3 As shown, the resuscitation member 4 is located at the distal end of the catheter 3 and is a large-diameter trumpet structure formed by braiding multiple wires. It plays a role in increasing the suction negative pressure and wraps the thrombus during the thrombus removal and withdrawal process of the device to prevent the thrombus from overflowing. The number of wire heads of the resuscitation member 4 is m, 6<m<96, m is an even number, and the wire diameter is d1, 0.0005inch<d1<0.005inch, as shown in FIG. Figure 4 As shown, the braided structure of the re-absorption member 4 is formed by 1-press-1 or 1-press-2 braiding; the outer diameter of the bell mouth is larger than the outer diameter of the proximal end of the re-absorption member 4; Figure 5 As shown, the retraction member 4 can be a twisted wire braided structure.

[0047] The resorption member 4 is woven from wire materials with superelasticity, such as nickel titanium, cobalt chromium, etc., and can be further woven from wire materials containing a platinum core to enhance the imaging ability; the proximal end of the resorption member 4 is connected to the distal end of the catheter 3, and there are two ways of connection: the resorption member 4 can be an extension of the middle braided layer of the catheter 3, and is formed by heat treatment, or the resorption member 4 is connected to the catheter 3 by bonding, welding, or pressing to ensure that the structure does not shift when the thrombus is captured, and to avoid the thrombus falling off due to loose connection.

[0048] The bolt-breaking member 5 is a closed structure at both ends, with the following specific features:

[0049] It has a high degree of freedom in both the axial and circumferential directions, and is used to cut and destroy thrombi during thrombus removal, and to nest active thrombi and recover them into the catheter 3. The thrombus-breaking member 5 is woven with multiple wires to achieve a high weaving density. During clinical use, it can block blood flow and form local vortices by blocking blood flow, which promotes the movement of emboli toward the catheter so that the emboli can be better recovered into the reabsorption member 4, minimizing the risk of emboli being washed to the distal end by the blood flow and causing distal vascular occlusion.

[0050] The proximal end of the embolism member 5 is connected to the distal end of the metal tube 2, and the two are relatively fixed. They can be connected together by welding, bonding, metal ring compression, or polymer heat shrinkage. This allows the operator to manipulate the proximal end of the metal tube 2 to achieve circumferential twisting and forward and backward movement of the embolism member 5, and to withdraw it after embedding a large thrombus. The distal end of the embolism member 5 has a high degree of freedom, and the metal core wire 1 passes through the center of its distal end, so there is no relative restraint between the two.

[0051] The embolization element 5 has X-ray-opaque markings at both ends. The material can be one or more of platinum, platinum-iridium, and platinum-tungsten. This allows for precise location of the embolization area under DSA imaging, preventing damage to the vessel wall during excessive manipulation. The embolization element 5 is woven from superelastic wire, such as nickel-titanium or cobalt-chromium, and can be further woven from wire containing a platinum core to enhance imaging capabilities.

[0052] like Figure 6 As shown, the bolt-breaking member 5 is a lantern-shaped structure formed by weaving, the number of wire heads is n, 12≤n≤96, n is an even number, the wire diameter is d2, 0.0005inch<d2<0.005inch; Figure 7 As shown, in another possible design, the bolt breaker 5 is designed as a square twisted wire structure, the number of wire heads is k, 4≤k≤24, k is an even number, and the wire diameter is d3, 0.0005inch<d3<0.005inch.

[0053] like Figure 8 As shown, the embolism barrier 6 is an umbrella-shaped hollow structure formed by braiding multiple wires. It is used to capture tiny escaped emboli generated during embolectomy and prevent them from entering distal blood vessels with the blood flow and causing acute occlusion. The embolism barrier 6 has a certain braiding density and is designed as a closed-end structure. The proximal end is connected to the metal core wire 1 in the metal tube 2, and axial push and pull are achieved through the axial movement of the metal core wire 1. The distal end of the embolism barrier 6 has a high degree of freedom. The metal core wire 1 passes through the center of the distal end, and there is no relative restraint between the two.

[0054] The distal end of the stopper 6 has a high degree of freedom, and the proximal end of the stopper 6 is connected to the metal core wire 1. The two are relatively fixed and can be connected together by welding, bonding, or metal ring crimping. The operator can achieve axial push and pull of the stopper 6 by manipulating the proximal end of the metal core wire 1.

[0055] Both ends of the blocking member 6 contain X-ray-opaque marking points, and the material can be one or more of platinum, platinum-iridium, and platinum-tungsten, which assist the operator in real-time confirmation of the interception position and ensure that the protective umbrella covers the potential escape path of the embolus; the blocking member 6 is woven from wire materials with superelasticity, such as nickel-titanium, cobalt-chromium, etc., and can be further woven from wire materials containing a platinum core to enhance the imaging ability; the number of wire heads of the blocking member 6 is s, 12≤s≤96, s is an even number, and the wire diameter is d4, 0.0005inch<d4<0.005inch.

[0056] like Figure 9 As shown, the blocking member can be designed to have a straight section structure, such as Figure 10 As shown, the blocking member can be designed as an eccentric structure with a curvature structure to fit the vessel wall in a curved blood vessel.

[0057] like Figure 12 As shown, during the delivery process, in order to control the relative displacement of the components and to ensure that they are in place synchronously, the proximal end of the thrombectomy and protection device can be connected to the handle 7 to temporarily fix the catheter 3 and the metal core wire 1 relative to each other to avoid the thrombectomy path being offset due to component displacement. During the operation, the metal tube 2 is twisted and the metal core wire 1 is moved axially by controlling the handle to realize the circumferential twisting of the thrombus-breaking component 5 and the axial pushing and pulling of the thrombus-blocking component 6 to deploy protection. Combined with the negative pressure suction of the resorption component 4, an integrated thrombectomy process of "crushing-capturing-recovery" is formed. This collaborative working mechanism can improve the efficiency of thrombus removal while reducing the risk of distal embolic complications. It is suitable for emergency treatment of acute ischemic stroke and peripheral vascular embolism.

[0058] like Figure 13 As shown, the method of using the thrombectomy and protection device is as follows:

[0059] In clinical use, the system is pushed as a whole to the distal end of the lesion, the handle 7 fixing part is removed, and the catheter 3 is slowly withdrawn to the proximal end of the lesion. At this time, the retraction part 4 is located proximal to the lesion and adheres to the blood vessel wall, while the embolism part 5 is located at the lesion, and the embolism blocking part 6 is located distal to the lesion and gradually opens;

[0060] After the breaker 5 and the blocking member 6 are fully opened, the high-density braiding of the breaker 5 can block the blood flow. The metal tube 2 is manipulated proximally to push, pull and twist the breaker 5, embedding and breaking up large plaques. Under the condition of negative pressure at the proximal end, the broken plaques are sucked back into the suction member 4. The large plaques will be captured by the breaker 5 and taken out of the body. At this time, if some small emboli escape, they can be captured by the blocking member 6.

[0061] Then, the metal tube 2 and the metal core wire 1 are retracted, and the bolt-breaking member 5 and the bolt-blocking member 6 are retracted as a whole into the retraction member 4 and the proximal catheter 3. The trumpet mouth of the retraction member 4 can form a net bag to wrap the bolt-breaking member 5 and the bolt-blocking member 6, thereby preventing the embolus from escaping during the recovery process.

[0062] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily 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 is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A thrombus removal and protection device, characterized in that: The invention comprises a delivery member and a thrombus removal member, wherein the delivery member comprises a metal tube (2) and a catheter (3), wherein the metal tube (2) is movably sleeved inside the catheter (3), and the thrombus removal member comprises a reabsorption member (4) and a thrombus breaking member (5), wherein the proximal end of the reabsorption member (4) is connected to the distal end of the catheter (3), and the proximal end of the thrombus breaking member (5) is fixedly connected to the distal end of the metal tube (2), and a metal core wire (1) is movably sleeved inside the metal tube (2), and the metal core wire (1) extends from the proximal end to the reabsorption member (4) at the distal end along the axial direction of the metal tube (2), and then movably connects to the thrombus breaking member (5) and the thrombus blocking member (6) in sequence; The distal end of the re-sucking member (4) is a bell-mouth structure, and the outer diameter of the bell-mouth is larger than the outer diameter of the proximal end of the re-sucking member (4); The bolt-breaking member (5) is a structure with both ends closed, and the metal core wire (1) passes through the proximal and distal centers of the bolt-breaking member (5) in sequence, and the circumferential twisting and forward and backward movement of the bolt-breaking member (5) are achieved by manipulating the proximal end of the metal tube (2); The blocking member (6) is a structure with both ends closed, and the metal core wire (1) passes through the proximal and distal centers of the blocking member (6) in sequence, and axial pushing and pulling are achieved through the axial movement of the metal core wire (1).

2. The thrombus removal and protection device according to claim 1, characterized in that: The number of wire heads of the re-absorption member (4) is m, 6<m<96, and m is an even number. The wire diameter of the re-absorption member (4) is d1, 0.0005 inch<d1<0.005 inch.

3. The thrombus removal and protection device according to claim 1, characterized in that: The bolt-breaking member (5) is a lantern-shaped structure formed by weaving. The number of wire heads of the bolt-breaking member (5) is n, 12≤n≤96, and n is an even number. The wire diameter of the bolt-breaking member (5) is d2, 0.0005 inch<d2<0.005 inch.

4. The thrombus removal and protection device according to claim 1, characterized in that: The bolt-breaking member (5) is a square twisted wire structure, the number of wire heads of the bolt-breaking member (5) is k, 4≤k≤24, and k is an even number, and the wire diameter of the bolt-breaking member (5) is d3, 0.0005 inch<d3<0.005 inch.

5. The thrombus removal and protection device according to claim 1, characterized in that: X-ray-proof marking points are provided at both ends of the bolt-breaking member (5), and the proximal end of the bolt-breaking member (5) is connected to the distal end of the metal tube (2) by welding, bonding, metal ring pressing or polymer heat shrinkage.

6. The thrombus removal and protection device according to claim 1, characterized in that: X-ray-proof marking points are provided at both ends of the blocking member (6). The blocking member (6) is an umbrella-shaped hollow structure formed by weaving. The number of wire heads of the blocking member (6) is s, 12≤s≤96, and s is an even number. The wire diameter of the blocking member (6) is d4, 0.0005 inch<d4<0.005 inch.

7. The thrombus removal and protection device according to claim 1, characterized in that: The surface of the metal tube (2) is provided with spiral cutting patterns, the spiral cutting patterns are of a variable pitch structure, and the groove width of the spiral cutting patterns on the surface of the metal tube (2) is t, 0.02mm<t<0.1mm.

8. The thrombus removal and protection device according to claim 7, characterized in that: The proximal pitch of the spiral cutting pattern is p, p=a*t, wherein a≥5 and a is a positive integer, and the distal pitch of the spiral cutting pattern is p'=p / b, b>1.

9. The thrombus removal and protection device according to claim 1, characterized in that: The metal core wire (1) is a variable diameter structure, with a proximal wire diameter of 0.3-0.6 mm and a distal wire diameter of 0.05-0.15 mm.

10. The thrombus removal and protection device according to claim 1, characterized in that: The re-absorption member (4) is an extension of the middle braided layer of the catheter (3) and is formed through heat treatment; or the re-absorption member (4) and the catheter (3) are connected together by bonding, welding, or pressing.

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