CN109480958B - A multi-adaptive multi-caliber thrombectomy device that prevents over-cutting - Google Patents

Abstract

A multi-adaptive multi-diameter thrombectomy device that prevents over-cutting, including a thrombectomy unit tube, which has a collapsed form and an expanded form. The thrombectomy unit tube is provided with at least two sections and connected in sequence as A whole body, in which at least two sections of the thrombectomy unit tubes respectively have different expanded diameters. The invention has a simple structure and is easy to use. It is designed for Chinese stroke patients suffering from vascular stenosis. Generally speaking, it has the advantages of small surgical trauma, good flexibility, good radial support, easy development and positioning, easy assembly and use, and good thrombectomy effect. .

Description

A multi-adaptive multi-caliber thrombectomy device that prevents over-cutting

Technical field

The invention relates to the technical field of medical devices, specifically a multi-adaptive multi-caliber thrombectomy device that prevents over-cutting.

Background technique

Cerebral stroke is a group of diseases with symptoms of cerebral ischemia and hemorrhagic injury as the main clinical manifestations. According to a result in Circulation in 2017, the prevalence of stroke in my country is 1114.8/100,000 people. The number of sick people nationwide is 14.94 million. The mortality rate is 114.8/100,000 people/year, and the number of deaths is 1.54 million. In addition, the number of stroke patients in my country continues to grow at a rate of 8.7%. Stroke not only has a high incidence rate, high growth rate and high fatality rate, but also has a high disability rate and high recurrence rate. Cerebral stroke is currently the number one killer of people in our country, and about 60% to 80% of surviving stroke patients will suffer from varying degrees of disability, which in severe cases affects normal life. Patients with a history of stroke have 1/4~3/4 may relapse within 2~5 years.

Stroke is divided into two categories: hemorrhagic stroke and ischemic stroke. Hemorrhagic stroke accounts for about 70% of strokes. Due to insufficient blood supply to the brain, hemorrhagic stroke leads to brain tissue dysfunction and necrosis. Generally speaking, thrombosis (the formation of an obstructing blood clot in the brain), embolism (the formation of an embolus from elsewhere), systemic insufficiency (general systemic insufficiency of blood supply, such as in shock), and venous thrombosis are the main causes of hemorrhagic stroke.

Timely and effective dredging of the blood vessels in the lesion and maintaining normal blood flow in the lesion are the keys to the treatment of hemorrhagic stroke. At present, the common therapies are arteriovenous drug thrombolysis and mechanical thrombectomy. Arteriovenous drug therapy generally uses thrombolytic agents such as tissue plasminogen activator (tPA) or urokinase to be injected into the lesion. Although drug thrombolysis methods are widely recognized by international organizations, they have limited time windows. requirements (intravenous drug thrombolysis needs to be carried out within 3 hours after the onset of illness, and arterial thrombolysis needs to be carried out within 6 hours after the onset of illness) and requirements for the outer diameter of the thrombus and the lesion blood vessel (generally the outer diameter of the blood vessel exceeds 8mm, which is not suitable for practical drugs Thrombolysis) greatly limits the scope and effectiveness of drug thrombolysis. However, mechanical thrombectomy has the advantage of breaking these limitations and can achieve good therapeutic effects. Among the mechanical thrombectomy methods, the laser thrombus fragmentation method is complex to operate, and mechanical thrombus cutting is very harmful to blood vessels, while the thrombectomy net thrombectomy method is simple to operate and is relatively less invasive to the diseased blood vessels. Although the embolus-catching net thrombectomy method has excellent results, it has high requirements for the design, structure, processing and production of the device. The mechanical thrombus catchers that can be purchased and used on the market are, to a certain extent, difficult to meet the requirements of doctors and patients, especially In view of the vascular stenosis associated with most Chinese strokes, it is difficult for the devices on the market to achieve good treatment and less invasive results. They often have shortcomings such as poor vascular adaptability, thrombus escape, and difficulty in balancing structural flexibility and strength. , the capture effect is poor.

Contents of the invention

The technical purpose of the present invention is to provide a multi-adaptive multi-caliber thrombectomy device that prevents over-cutting and solves the problem of poor thrombus capture effect of traditional thrombectomy instruments.

The specific technical solution of the present invention is as follows: a multi-adaptive multi-diameter thrombectomy device that prevents over-cutting, including a thrombectomy unit tube, which has a collapsed form and an expanded form. At least two sections are provided and connected in sequence to form a whole, wherein at least two sections of the thrombectomy unit tubes respectively have different expanded diameters.

Preferably, the diameter of the expanded form ranges from 0.5 to 6 mm.

Preferably, the thrombectomy unit tube is provided with three sections and connected in sequence as a whole, and the distal thrombectomy unit tube, the middle thrombectomy unit tube and the proximal thrombectomy unit tube are distinguished from each other. The distal thrombectomy unit tube, The expanded diameter of the proximal thrombectomy unit tube is larger than the expanded diameter of the intermediate thrombectomy unit tube.

Preferably, the expanded diameter of the distal thrombectomy unit tube ranges from 0.5 to 6 mm, the expanded diameter of the proximal thrombectomy unit tube ranges from 0.5 to 6 mm, and the intermediate thrombectomy unit tube ranges from 0.5 to 6 mm. The expanded diameter of the unit tube ranges from 0.4 to 5 mm.

Preferably, the thrombectomy unit tube includes a plurality of ribs and a plurality of thrombectomy grids surrounded by the ribs, and the ribs are continuous or interrupted in the axial direction of the thrombectomy unit tube. The thrombectomy unit tube has a continuous sinusoidal waveform, and multiple circles of circumferential grid annulus are arranged on the thrombectomy unit tube along its own axial direction, and the circumferential grid annulus is composed of the circumferential arrangement of the thrombectomy grid.

Preferably, the mesh areas of the plug-removing meshes in the same circumferential mesh annular zone are all the same.

Preferably, there are at least two circles of the circumferential mesh annular zone containing the thrombectomy mesh with different mesh areas on the thrombectomy unit tube.

Preferably, there are two different circumferential grid annular zones, and the grid areas of the thrombectomy grids contained in them are one time different.

Preferably, the two different circumferential mesh annular zones are staggered along the axial direction of the thrombectomy unit tube.

Preferably, the grid area of the thrombectomy grid ranges from 2 to 100 mm ² .

Preferably, the distal end of the thrombectomy unit tube as the initial section of the thrombectomy device is also provided with a special-shaped guide connection section, and the special-shaped guide connection section is integrally formed with the thrombectomy unit tube; the special-shaped guide The connection section includes a starting rib line and a plurality of starting thrombectomy grids surrounded by the starting rib line, and the starting rib line and the starting thrombectomy grid are connected with the thrombectomy unit tube. The ribs and the bolt removal grid have the same structural arrangement; the special-shaped guide connecting section is in an irregular tubular shape with a beveled section.

Preferably, a pulling wire is connected to the distal end of the special-shaped guide connection section.

Preferably, all, one or two of the three of the starting rib line of the special-shaped guide connecting section, the rib line of the thrombectomy unit tube, and the pulling wire are connected. There is a developing section.

Preferably, one or more of the starting ribs of the special-shaped guide connection section, one or more of the ribs of the thrombectomy unit tube as the initial section of the thrombectomy device, the traction All, one or two of the three wires are connected with a head-end area developing section.

Preferably, in addition to the thrombectomy unit tube as the initial section of the thrombectomy device and the thrombectomy unit tube as the last section of the thrombectomy device, at least one other section of the thrombectomy unit tube One or more of the ribs are connected to the main body area developing section.

Preferably, one or more of the ribs of the thrombectomy unit tube as the last section of the thrombus retriever are connected to a tail end region developing section.

Preferably, adjacent tubes of the thrombectomy unit are integrally formed.

Preferably, the adjacent thrombectomy unit tubes are each independently segmented, and the end of each thrombectomy unit tube is provided with a detachable connection component, and the detachable connection component includes a plurality of matching first sets. module unit and second module unit;

When the thrombectomy unit tube is provided with two sections, the first component unit is connected to one end of one section of the thrombectomy unit tube, and the second component unit is connected to the other section of the thrombectomy unit tube. At one end, the adjacent thrombectomy unit tubes are cooperatively connected to each other through the respective first component units and the second component units;

When the thrombectomy unit tube is provided with more than two sections, the proximal end of the thrombectomy unit tube as the initial section of the thrombectomy device is connected to the first component unit or the second component unit, as the The distal end of the thrombectomy unit tube at the end of the thrombectomy device is connected to the first component unit or the second component unit, and the two ends of the remaining thrombectomy unit tubes in each section are connected to the first component unit respectively. The module unit, the second module unit, and the adjacent thrombectomy unit tubes are cooperatively connected to each other through the respective first module unit and the second module unit.

Preferably, the first assembly unit includes at least two sections of struts connected to the end of the tube of the thrombectomy unit and an annular portion connected to each section of the struts, and the second assembly unit includes At least one connecting section of the rib wire connected to the end of the tube of the thrombectomy unit, the connecting section includes a first section extending from the rib line, extending from the first section and passing through All of the second sections of the annular portion and a third section extending from the second sections and spirally wound back to the first section.

Preferably, one of the elastic connecting sections is connected between the annular parts belonging to the same first component unit.

Preferably, two of the elastic connecting sections are connected between the annular portions belonging to adjacent first component units.

The technical advantage of the present invention is that the multi-adaptive multi-caliber thrombectomy device that prevents over-cutting has a simple structure and is easy to use. It is designed for Chinese stroke patients suffering from vascular stenosis. Generally, it has the advantages of small surgical trauma, good flexibility, It has the advantages of good radial support, easy development and positioning, and easy assembly and use; for the narrow blood vessels at the lesion, the multi-section design, and the tube segments with different expansion shapes and diameters are suitable for the blood vessel segments with different stenosis conditions, improving the adaptability to blood vessels and different thrombectomy. At the same time, the object capture ability enables reasonable and effective cutting and capturing of thrombus in multiple target blood vessel segments, preventing the thrombus from being completely chopped into pieces and causing the thrombus to escape; the design of thrombectomy grids of various sizes ensures a good diameter. While providing support, it is more conducive to capturing thrombus of various sizes.

Description of the drawings

Figure 1 is a schematic structural diagram of an embodiment of the present invention;

Figure 2 is a partial structural schematic diagram of an embodiment of the present invention;

Figure 3 is a partial structural schematic diagram of an embodiment of the present invention;

Figure 4 is a partial structural schematic diagram of an embodiment of the present invention;

Figure 5 is a partial structural schematic diagram of an embodiment of the present invention;

The names of the parts corresponding to the numbers in the figure are: 1-thrombus removal unit tube, 11-rib line, 12-thrombus removal grid, 13-pillar, 14-ring part, 141-one of the elastic connection sections, 142- The second elastic connection section, 15-connection section, 2-special-shaped guide connection section, 21-start rib line, 22-start thrombectomy grid, 3-traction wire, a-head area development section, b-main body Regional development section, c-tail end regional development section.

Detailed ways

The present invention will be further described below through specific embodiments in conjunction with the accompanying drawings:

See Figure 1, a multi-adaptive multi-diameter thrombectomy device that prevents over-cutting, including a thrombectomy unit tube 1. The thrombectomy unit tube 1 has a collapsed form and an expanded form. The thrombectomy unit tube 1 is provided with three sections and connected in sequence. As a whole, the distal thrombectomy unit tube, the middle thrombectomy unit tube and the proximal thrombectomy unit tube are distinguished from each other. The expanded diameters of the distal thrombectomy unit tube and the proximal thrombectomy unit tube are larger than the middle thrombectomy unit tube. diameter of the expanded form. The expanded diameter of the distal thrombectomy unit tube is 5 mm, the expanded diameter of the proximal thrombectomy unit tube is 5 mm, and the expanded diameter of the intermediate thrombectomy unit tube is 3 mm. The three-section thrombectomy unit tube 1 set up in this way is a relatively basic and fully functional thrombectomy device. Generally speaking, the number of thrombectomy unit tubes 1 is set within 20, which is relatively conventional. The amount of thrombus accumulated in the diseased blood vessels often varies greatly. In this embodiment, different sections of thrombectomy unit tubes 1 can be specifically inserted into different sections of blood vessels to locate and capture the thrombus, because the ideal thrombectomy unit tube 1 The diameter of the tube should be relatively smaller than the diameter of the blood vessel at the lesion. This can reduce the metal contact area to a certain extent to reduce vasospasm, and at the same time prevent the thrombus from being shredded due to the excessive diameter of the thrombectomy unit tube 1. , that is, the main body of the thrombus retrieval unit tube 1 can be relatively stably embedded in the entire thrombus block and drive the entire thrombus block, thereby avoiding the subsequent occurrence of thrombus escape. Existing thrombectomy devices perform poorly in this regard. They have poor adaptability to blood vessels with different stenosis conditions and cannot safely and targeted thrombectomy. The uniform diameter of the thrombectomy device after expansion often results in certain areas where the blood vessel wall Being compressed to varying degrees, resulting in harmful contact reactions, the thrombus on it is easily completely shredded, difficult to be fixed and taken out, and remains in the blood vessel. The technical solution of the present invention can flexibly set and use corresponding thrombectomy devices for different lesions, effectively reducing harmful contact reactions, ensuring the thrombectomy range, improving the thrombectomy effect, and improving the compliance with blood vessels.

Combined with Figures 2, 3, and 4, the thrombectomy unit tube 1 includes a plurality of ribs 11 and a plurality of thrombectomy grids 12 surrounded by the ribs 11. The ribs 11 are in the axial direction of the thrombectomy unit tube 1. The direction is a continuous or intermittent sinusoidal waveform. There are multiple circles of circumferential grid rings arranged on the thrombectomy unit tube 1 along its own axial direction. The circumferential grid rings are arranged circumferentially by the thrombectomy grid 12. composition. The thrombectomy device can be laser-engraved from a metal base (such as nickel-iron alloy, tungsten, tantalum, stainless steel, gold, cobalt-chromium or other alloys, etc.) to form a tubular structure with mesh, or it can be made of metal wire (such as nickel-iron alloy, tantalum, etc.) wire, stainless steel wire, gold alloy wire and other metal wires) are woven into a tubular structure with mesh. The structures of the rib wire 11 and the bolt removal grid 12 are realized by these two methods.

The grid areas of the thrombectomy grids 12 in the same circumferential grid band are all the same. There are two different circumferential grid bands, and the grid areas of the thrombectomy grids 12 contained in them are twice as different. . The two different circumferential grid rings are staggered along the axial direction of the thrombectomy unit tube 1 . In the figure, the smaller, that is, the shape of the basic thrombectomy grid 12 is approximately a diamond; while the larger, that is, the thrombectomy grid 12 with twice the grid area can actually be designed into two diamond shapes. The basic bolt removal grid 12 is structurally equivalent to removing a section of ribs 11, so that the two rhombuses merge into a larger parallelogram. The difference in design and interlacing of the grid area can be clearly understood from the illustration. Arrangement settings. In addition, the grid areas of these two types of thrombectomy grids 12 are 10mm2 and 20mm2. Such a structure and size design is a more preferred solution. It can take into account the compliance performance and radial support performance of the pipe body while having a simple structure and is relatively easy to implement, making the entire pipe body easy to form and stable to use, and maximizing improvement. The binding force between thrombus and thrombectomy device. Of course, on the basis of the above, similar larger or smaller changes can be made in terms of the grid area difference of the thrombectomy grid 12, and the difference can be an integer multiple or a non-integer multiple, without unnecessarily increasing the structural complexity and process. Depending on the difficulty of production, the arrangement method and grid size can be more irregular, and the support performance and thrombectomy effect will be better. Different mesh areas can capture thrombus of different sizes and enhance the ability to capture thrombus. At the same time, meshes of different sizes can also provide different thrombus stabilizing meshes in three-dimensional space, effectively providing stability during transportation after thrombus capture. Prevent thrombus from breaking away.

With reference to Figures 1 and 2, the distal end of the thrombectomy unit tube 1, which is the initial section of the thrombectomy device, is also provided with a special-shaped guide connection section 2. The special-shaped guide connection section 2 is integrally formed with the thrombectomy unit tube 1; the special-shaped guide connection section 2 includes a starting rib line 21 and a plurality of starting thrombectomy grids 22 surrounded by the starting rib line 21, and the sum of the starting rib line 21 and the starting thrombectomy grid 22 and the rib line of the thrombectomy unit tube 1 The structural settings of the thrombectomy grid 12 are the same; the special-shaped guide connecting section 2 is in the shape of an irregular tube with a beveled cross section. That is to say, the actual structural composition and unit design of the special-shaped guide connection section 2 are the same as those of the thrombectomy unit tube 1, but the shape settings are different. The connection between the special-shaped guide connecting section 2 and the thrombectomy unit tube 1 can be that the starting rib line 21 and the rib line 11 are jointly connected and form a common thrombectomy grid that is the same as the starting thrombectomy grid 22 and the thrombectomy grid 12 , of course, it can also be just connecting rib sections that are connected as one body. The irregular tubular shape here can be understood as equivalent to the tube body left after cutting a part of the cylindrical tube diagonally from the side. In this embodiment, choosing the shape that performs better can be understood as equivalent to beveling a circular tube from the upper bottom surface to the lower bottom surface at the maximum inclination angle until it is divided into two symmetrical halves. Each half will be flattened as shown in the figure. There is a triangle-like special-shaped guiding connecting section 2 in the section, and the distal end of such special-shaped guiding connecting section 2, that is, its approximately triangular tip is connected to a pulling wire 3. This arrangement enables the thrombectomy device to travel in curved blood vessels. At this time, in the case of a normal tubular shape, it is possible to avoid the phenomenon that the distal end of the thrombectomy device becomes cone-shaped due to the bending of the blood vessel.

With reference to Figure 2, Figure 3, and Figure 4, one or more starting rib lines 21 of the special-shaped guide connection section 2, one or more rib lines 11 of the thrombectomy unit tube 1 as the starting section of the thrombectomy device, and the pulling wire 3 All, one or two of the three are connected to a head-end region developing section a. Except for the thrombectomy unit tube 1 as the starting section of the thrombectomy device and the thrombectomy unit tube 1 as the last section of the thrombectomy device, one or more ribs 11 of at least one section of the thrombectomy unit tube 1 are connected to the main body. Area development section b. One or more ribs 11 of the thrombectomy unit tube 1 as the last section of the thrombectomy device are connected to the tail end area developing section c. In this embodiment, the head-end region developing section a is connected to the pulling wire 3 and between the special-shaped guide connecting section 2 and the starting section of the thrombectomy unit tube 1. The middle section of the thrombectomy unit tube constitutes a larger section. The rib lines 11 of the bolt grid 12 are connected to the main area developing section b, and the tail area developing section c is connected to the proximal end of the thrombectomy unit tube 1 at the end. Multiple sections contain developing structures and are developed throughout the body, and The development structure is set in a reasonable and effective position, which not only facilitates the development and positioning during the operation, but also ensures that the optimal setting in the structure, the quantity and the specific position are reasonable, and the structural strength of the thrombectomy device is not affected. The developing structure is evenly distributed around the circumference of the thrombus retriever to achieve the maximum developing effect. The developing structure can be made by welding developing materials (such as platinum, gold, tantalum, etc.) or by welding developing wires (such as platinum, gold, etc.) Tantalum and other developing wires) are connected and fixed with the thrombus remover by winding.

The thrombectomy device can be selected as one-piece or individually segmented. When molded in one piece, although the thrombectomy device has a multi-section structure, it can be laser cut from a single pipe. For different pipe diameters, this design can be shaped by post-processing with the mold; it can also be made of metal, alloy or polymer. It is woven from silk material, and then used with molds for post-processing and shaping; it can also be 3D printed, and then surface-treated at a later stage. These methods can be realized using existing mature technologies. When segmented independently, the aforementioned manufacturing method is applicable to each individual segment, and the adjacent thrombectomy unit tubes 1 can be connected as a whole through welding, riveting, crimping, weaving and other existing connection methods in the field.

See Figure 5. In this embodiment, a more specifically designed connection method corresponding to the independent segment form is designed. That is, the adjacent thrombectomy unit tubes 1 are detachably connected. The ends of the thrombectomy unit tubes 1 are provided with detachable connection components. The detachable connection components include multiple sets of matching first component units and second component units. ; When the thrombectomy unit tube 1 is provided with two sections, the first component unit is connected to one end of one of the thrombectomy unit tubes 1, the second component unit is connected to one end of the other section of the thrombectomy unit tube 1, and the adjacent one is connected to one end of the thrombectomy unit tube 1. The thrombectomy unit tube 1 is connected to each other through the respective first component unit and the second component unit; when the thrombectomy unit tube 1 is provided with more than two sections, the proximal end of the thrombectomy unit tube 1 as the initial section of the thrombectomy device is connected to the third section. A module unit or a second module unit, the distal end of the thrombectomy unit tube 1 as the last section of the thrombectomy device is connected to the first module unit or the second module unit, and the two ends of each remaining section of the thrombectomy unit tube 1 are connected respectively. The first component unit, the second component unit, and the adjacent thrombectomy unit tubes 1 are connected to each other through the respective first component unit and the second component unit. In this embodiment, three sections of thrombectomy unit tubes are provided, so after selection the specific settings of the user.

The first component unit includes a rib 11 connected to the end of the thrombectomy unit tube 1 and at least two sections of struts 13 and an annular portion 14 connected to each section of the strut 13. At least one connecting section 15 of the ribs 11 at the bottom. The connecting section 15 includes a first section extending from the ribs 11, a second section extending from the first section and passing through all the annular portions 14, and a second section extending from the ribs 11. A second section extends out and is spirally wrapped back to a third section on the first section. It can also be clearly understood from the figure that the pillar 13 of the first component unit is bifurcated, and has a common end point connected to the rib 11 at the end of the tube 1 of the thrombectomy unit (in fact, this connection also constitutes some thrombectomy units). The common connection point of the ribs 11 of the grid 12), the existence of the two annular parts 14, and the connection with a connecting section 15 can ensure that the connection is stable enough and suitable for bolt removal under a relatively reasonable number of settings and cost control. The behavior of unit tube 1 during push. The connecting section 15 itself is thicker than the ribs 11. A spiral pattern is set on the first section. When the third section is wound back, it matches the spiral pattern. The first section can be further welded and fixed with the third section. The pillar 13 and the connecting section 15 themselves It can be integrally formed with the rib line 11, or can be shaped through mold processing at a later stage, such as welding and other conventional methods. The existence of the detachable connecting component not only realizes the connection between each independent segment, but also enables flexible segment setting for different narrow blood vessels, and can also meet the bending and torsion of the thrombectomy device during intravascular pushing. Required flexibility and stability. Furthermore, one of the elastic connecting sections 141 is connected between the annular parts 14 belonging to the same first module unit, and the second elastic connecting section 142 is connected between the annular parts 14 belonging to adjacent first module units. It can effectively improve the flexibility and stability, and follow the bending, twisting and other movements of the thrombectomy unit tube 1 to ensure a stable and firm connection state and smooth and smooth movements.

Claims (8)

1. A multi-adaptive multi-diameter thrombectomy device that prevents over-cutting, including a thrombectomy unit tube (1). The thrombectomy unit tube (1) has a collapsed form and an expanded form, and is characterized by: The thrombectomy unit tube (1) is provided with at least two sections and connected in sequence to form a whole, wherein at least two sections of the thrombectomy unit tube (1) have different expanded diameters; The thrombectomy unit tube (1) includes a plurality of ribs (11) and a plurality of thrombectomy grids (12) surrounded by the ribs (11). The ribs (11) are located in the ribs. The axial direction of the plug unit tube (1) presents a continuous or intermittent sinusoidal waveform. There are multiple circles of circumferential grid rings arranged along the axial direction of the plug unit tube (1). The circumferential grid annulus is composed of the circumferential arrangement of the thrombectomy grid (12); Each of the adjacent thrombectomy unit tubes (1) is an independent segment, and the end of each thrombectomy unit tube (1) is provided with a detachable connection component, and the detachable connection component includes multiple sets of matching The first component unit and the second component unit, specifically, when the thrombectomy unit tube (1) is provided with two sections, the first component unit is connected to one end of one of the thrombectomy unit tubes (1). , the second component unit is connected to one end of the thrombectomy unit tube (1) of another section, and the adjacent thrombectomy unit tubes (1) pass through the respective first component unit and the second The component units are connected to each other; when the thrombectomy unit tube (1) is provided with more than two sections, the proximal end of the thrombectomy unit tube (1) as the initial section of the thrombectomy device is connected to the first component unit or the second assembly unit, the distal end of the thrombectomy unit tube (1) as the last section of the thrombectomy device is connected to the first assembly unit or the second assembly unit, and each of the remaining sections The two ends of the thrombectomy unit tube (1) are respectively connected to the first component unit and the second component unit, and the adjacent thrombectomy unit tubes (1) pass through the respective first component unit and the second component unit. The second component units are cooperatively connected to each other; The first component unit includes at least two sections of struts (13) connected to the ribs (11) at the end of the thrombectomy unit tube (1) and a circular support section connected to each section of the struts (13). Ring portion (14), the second component unit includes at least one connecting section (15) of the rib (11) connected to the end of the thrombectomy unit tube (1), the connecting section (15) It includes a first section extending from the rib (11), a second section extending from the first section and passing through all the annular parts (14), and a second section extending from the second section. and spirally wound and fixed back to the third section on said first section; The value range of the diameter of the expanded form is 0.5~6mm; One of the elastic connecting sections (141) is connected between the annular parts (14) belonging to the same first module unit; or/and the annular parts belonging to adjacent first module units (14) is connected with the second elastic connecting section (142). 2. A multi-adaptive multi-diameter thrombectomy device to prevent over-cutting according to claim 1, characterized in that: the thrombectomy unit tube (1) is provided with three sections and connected in sequence as a whole, with the distal end The thrombectomy unit tube, the intermediate thrombectomy unit tube and the proximal thrombectomy unit tube are distinguished from each other, and the expanded diameters of the distal thrombectomy unit tube and the proximal thrombectomy unit tube are larger than the diameter of the intermediate thrombectomy unit tube. Expanded form diameter. 3. A multi-adaptive multi-diameter thrombectomy device that prevents over-cutting according to claim 2, characterized in that: the expansion diameter of the distal thrombectomy unit tube ranges from 0.5 to 6 mm. The expanded diameter of the proximal thrombectomy unit tube ranges from 0.5 to 6 mm, and the expanded diameter of the intermediate thrombectomy unit tube ranges from 0.4 to 5 mm. 4. A multi-adaptive multi-diameter thrombectomy device to prevent over-cutting according to claim 1, characterized in that: the thrombectomy grids (12) in the same circumferential grid annulus are The mesh areas are all the same; there are at least two circles of the circumferential mesh annulus with different mesh areas of the thrombectomy mesh (12) on the thrombectomy unit tube (1). 5. A multi-adaptive multi-caliber thrombectomy device that prevents over-cutting according to claim 3, characterized in that: there are two different circumferential grid annulus zones, which contain the The mesh areas of the thrombectomy grids (12) are doubled; the two different circumferential grid rings are staggered along the axial direction of the thrombectomy unit tube (1). 6. A multi-adaptive multi-diameter thrombectomy device to prevent over-cutting according to claim 4 or 5, characterized in that: the grid area of the thrombectomy grid (12) ranges from 2 to 100 mm ² . 7. A multi-adaptive multi-diameter thrombectomy device to prevent over-cutting according to claim 1, characterized in that: the distal end of the thrombectomy unit tube (1) as the initial section of the thrombectomy device. The end is also provided with a special-shaped guide connection section (2), which is integrally formed with the thrombectomy unit tube (1); the special-shaped guide connection section (2) includes a starting rib line (21 ) and a plurality of starting thrombectomy grids (22) surrounded by the starting rib line (21), the starting rib line (21) and the starting thrombectomy grid (22) are related to the The ribs of the thrombectomy unit tube (1) and the thrombectomy grid (12) have the same structure; the special-shaped guide connection section (2) is in an irregular tubular shape with a beveled section; the The distal end of the special-shaped guide connection section (2) is connected with a traction wire (3). 8. A multi-adaptive multi-diameter thrombectomy device to prevent over-cutting according to claim 7, characterized in that: on the starting rib line (21) of the special-shaped guide connection section (2), A developing section is connected to all, one or two of the three ribs (11) of the thrombectomy unit tube (1) and the pulling wire (3).