A thrombectomy system for treating large-size vascular embolism and a method of using the same

Abstract

This invention relates to a thrombectomy system for treating large-sized vascular embolisms and its method of use. The thrombectomy system includes a self-expanding stent, a first connecting tube, a connecting rod, an extension line, a pressure block, and a handle. The self-expanding stent, the first connecting tube, the connecting rod, the extension line, and the pressure block are connected sequentially from left to right. The extension line is fitted with a handle. The method of using the thrombectomy system is as follows: a guidewire is inserted to the thrombus location, a microcatheter is inserted to the distal end of the thrombus, the guidewire is removed from the microcatheter, and when the cannula is inserted halfway to the hemostatic valve, the hemostatic valve is released. The cannula is then inserted to the interface of the microcatheter, the hemostatic valve is tightened, the self-expanding stent is inserted into the microcatheter, the cannula is removed, the handle controls and pushes the extension line, the microcatheter is retracted, the self-expanding stent is released, the thrombus and the self-expanding stent are embedded, the self-expanding stent and the microcatheter are withdrawn, a syringe is used to apply negative pressure to the microcatheter, the microcatheter enters the long sheath, the hemostatic valve is disconnected, and the self-expanding stent, the microcatheter, and the hemostatic valve are withdrawn to complete the thrombectomy.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical devices, and in particular relates to a thrombus removal system for treating large-sized vascular embolism and a method of using the system. Background Art

[0002] Pulmonary embolism is a pathological and clinical condition caused by an impaction that enters the pulmonary artery and its branches, blocking the blood supply to the tissues. The most common emboli are blood clots, and the rest are rare neoplastic cells, fat droplets, bubbles, and drug particles. Some patients with pulmonary embolism can dissolve the pulmonary embolism on their own without treatment, but studies have found that the mortality rate of patients who do not receive treatment will exceed 20%. At present, the common treatment methods are mainly guidewire catheter thrombus fragmentation, thrombus aspiration, catheter thrombolysis and other treatment surgical methods. When using existing instruments alone to remove thrombi, the removal effect of large pulmonary artery thrombi is not ideal.

[0003] Chinese patent CN112438777A discloses a minimally invasive thrombectomy device for treating vascular embolism, comprising a thrombectomy device, a sleeved outer tube of a delivery system, an inner tube of a delivery system, and a handle of the delivery system. The thrombectomy device is pressed and gripped in a clamping cavity formed between the outer tube of the delivery system and the inner tube of the delivery system. The distal end of the inner tube of the delivery system is connected to the proximal end of the thrombectomy device. The handle of the delivery system is arranged on the proximal end of the inner tube of the delivery system. The thrombectomy device comprises a proximal end and a distal end in the shape of a mesh tube, and a middle section in the shape of a screw connecting the proximal end and the distal end. The diameters of the two ends of the thrombectomy device are larger than the diameter of the middle section of the thrombectomy device. The distal end of the thrombectomy device is covered with a polymer film. The problem of treating vascular embolism with a larger diameter is not solved. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a thrombus removal system for treating large-sized vascular embolism and a method of using the same.

[0005] The present invention provides a thrombectomy system for treating large-size vascular embolism, the thrombectomy system comprising a self-expanding stent, a connecting rod, a first connecting tube, an extension line, a pressing block, and a handle, wherein the self-expanding stent, the first connecting tube, the connecting rod, the extension line, and the pressing block are sequentially connected from left to right, the extension line is outerly provided with a handle, the self-expanding stent comprises a front thrombectomy stent, a middle thrombectomy stent, and a rear thrombectomy stent, the front thrombectomy stent, the middle thrombectomy stent, and the rear thrombectomy stent are sequentially connected in series, the front thrombectomy stent is connected to the middle thrombectomy stent via a first transition curved surface, the middle thrombectomy stent is connected to the rear thrombectomy stent via a second transition curved surface, and the front thrombectomy stent is connected to the middle thrombectomy stent via a second transition curved surface. The first end of the bolt bracket is connected to a protective cap with a thread, the second end of the rear bolt removal bracket is connected to a ferrule with a thread, the first end is located in the forward direction of the second end, the connecting rod includes a coaxially arranged cylindrical first step section, a cylindrical second step section, and a cylindrical third step section, which are connected in sequence from small to large in diameter, the outer surface of the cylindrical first step section is provided with a ferrule, the ferrule is threadedly connected to the second end of the rear bolt removal bracket, the outer side of the right end of the cylindrical third step section is connected to the extension line, the first connecting tube is a conical structure, and the first clamping thread and the second clamping thread are respectively provided on the right and left inner surfaces of the first connecting tube The second clamping thread is connected to the rear bolt removal bracket, the first clamping thread is connected to the cylindrical first step section, a sealing gasket made of silicone material is installed between the right side of the first connecting tube and the cylindrical second step section, the extension line includes a first wire body, a second wire body, and a third wire body, the first wire body, the second wire body, and the third wire body are wound around the outer surface of the cylindrical third step section, and the winding length is 5 cm. The first wire body, the second wire body, and the third wire body are woven together in a twist shape and connected to the pressing block, and the pressing block includes a first top wall, a first bottom wall, and a left side wall and a right side wall arranged between the first top wall and the first bottom wall. The first top wall The wall is arranged parallel to the first bottom wall, the left side wall and the right side wall are fixedly connected to the first top wall and the first bottom wall respectively, a first bayonet is opened on the left side wall, the first bayonet is a semi-enclosed structure, the first bayonet is connected to the right end of the extension line, the handle includes a shell arranged on the extension line, the shell includes a second top wall and a second bottom wall and a first rear wall arranged parallel to each other, the first rear wall is connected to the second top wall and the second bottom wall, a gap is left between the second top wall and the second bottom wall, a through hole is provided on the second top wall, a clamping gasket is provided above the through hole, a fastening bolt is provided above the clamping gasket, and the fastening bolt clamps the extension line through the through hole.

[0006] Furthermore, the front thrombus removal bracket, the middle thrombus removal bracket and the rear thrombus removal bracket are all sleeved with a sleeve.

[0007] Furthermore, the thrombectomy system also includes: a Y-shaped connector, a microcatheter, a long sheath, and a guide wire. The Y-shaped connector is connected to the microcatheter, the microcatheter is sleeved in the long sheath, the guide wire and the extension line are arranged in parallel, and the long sheath, the microcatheter, and the Y-shaped connector are all sleeved outside the guide wire and the extension line.

[0008] Furthermore, the length of the microcatheter is greater than the length of the long sheath tube, the length of the long sheath tube is greater than the length of the Y-type connector, and the length of the guidewire is greater than the total length of the microcatheter and the Y-type connector.

[0009] Furthermore, the Y-type connector includes a Luer connector, a hemostatic valve, a hollow tube, and a first connecting tube. The Luer connector is connected to the hemostatic valve through the hollow tube. The first connecting tube is provided on the hollow tube. The hollow tube and the first connecting tube are connected through a connector side branch. The first connecting tube is connected to the first valve port of the three-way valve through an intermediate tube, and the third valve port of the three-way valve is connected to the syringe.

[0010] Furthermore, the long sheath tube includes a straight tube, a curved tube, and a second connecting tube. The left end of the second connecting tube is connected to the straight tube, and the upper edge of the second connecting tube is connected to the curved tube. The straight tube, the curved tube, and the second connecting tube are an integrated tube. There is no weld at the connection between the straight tube, the curved tube, and the second connecting tube, and the curved tube is connected to the three-way valve.

[0011] Furthermore, the microcatheter includes a long tube, a cone-shaped tube, and blades. The long tube is connected to the left end of the cone-shaped tube, the left end and the right end of the cone-shaped tube are both connected, and two blades are symmetrically fixed on the outer side of the cone-shaped tube.

[0012] Furthermore, the self-expanding stent has an expanded state and a contracted state. The length of the self-expanding stent in the expanded state is 10 cm and the diameter is 8 cm. The length of the self-expanding stent in the contracted state is 15 cm and the diameter is 3 cm.

[0013] Furthermore, the fixed connection points of the first top wall, the first bottom wall, the left side wall and the right side wall are configured as rounded structures, and the rounded radius is 1.5 cm.

[0014] Furthermore, the extension cord is coated with a double-layer structure of a surface hydrophilic lubricating medical coating, and the thickness of the coating is 50 to 80 μm.

[0015] Furthermore, the surface hydrophilic lubricating medical coating has the following components in parts by weight: 7 parts of thickener, 40 parts of deionized water, 5 parts of photoinitiator, 8 parts of wetting agent, 3 parts of surfactant, 25 parts of polyurethane, 10 parts of adhesion promoter, 10 parts of cellulose ester, and 6 parts of catalyst.

[0016] Furthermore, the self-expanding stent has a structure with small ends and a large middle, and is telescopically folded by interweaving multiple clockwise curves and multiple counterclockwise curves. Several development marking blocks are provided at the intersection of the multiple clockwise curves and the multiple counterclockwise curves.

[0017] Furthermore, the inner hole of the compression gasket is a threaded structure, the material is alloy spring steel, the thickness is 1.5 to 2 mm, and the shape is flat.

[0018] Furthermore, the diameters of the first connecting tube and the sleeve are both smaller than the inner diameter of the long tube.

[0019] Further, the diameter of the long tube is smaller than the inner diameter of the straight tube.

[0020] Furthermore, the diameter of the extension line is smaller than the inner diameter of the Y-type connector, the microcatheter, and the long sheath.

[0021] Furthermore, the length of the sleeve is shorter than the length of the long tube.

[0022] Furthermore, the length of the straight tube is shorter than that of the long tube and the sleeve.

[0023] Furthermore, the width of the pressing block is 8-9% of the gap between the second top wall and the second bottom wall.

[0024] Furthermore, the left end of the Luer connector is connected to the right end of the cone head tube through threads, the long tube is movably sleeved in the second connecting tube and the straight tube, and the hollow tube and the connector side branch are at 45 degrees.

[0025] The present invention further provides a method for using a thrombectomy system for treating large-sized vascular embolism, comprising the following steps:

[0026] Step 1: The guide wire is sent to the thrombus location through the long sheath;

[0027] Step 2: Send the microcatheter to 10 mm distal to the thrombus;

[0028] Step 3, removing the guide wire from the microcatheter;

[0029] Step 4, when the cannula is inserted halfway into the hemostatic valve, release the hemostatic valve;

[0030] Step 5, deliver the cannula to the interface of the microcatheter and tighten the hemostatic valve;

[0031] Step 6, the self-expandable stent is delivered into the microcatheter, and the sheath is removed;

[0032] Step 7, the handle controls and pushes the extension wire until the self-expanding stent is flush with the end of the microcatheter;

[0033] Step 8: Push the extension wire, withdraw the microcatheter, and release the self-expanding stent for 5 minutes;

[0034] Step 9, the thrombus is embedded in the self-expanding stent, and the self-expanding stent and the microcatheter are withdrawn as a whole;

[0035] Step 10, using a syringe to negatively aspirate the microcatheter;

[0036] Step 11, the microcatheter is advanced to the proximal end of the long sheath, the hemostatic valve is disconnected, and the self-expanding stent, microcatheter, and hemostatic valve are pulled out as a whole to complete the thrombectomy.

[0037] Compared with the prior art, the beneficial effects of the present invention are:

[0038] 1. The thrombus removal system removes the thrombus blocked in the pulmonary blood vessels by mechanical means, thereby reopening the pulmonary blood vessels and restoring blood flow.

[0039] 2. The thrombus removal system can remove old thrombi with harder texture and thrombi with larger diameter.

[0040] 3. The self-expanding stent in the thrombectomy system is optimized in design to prevent the stent from puncturing the branch vessels of the pulmonary artery during implantation, thereby reducing the difficulty of the operation and avoiding surgical risks.

[0041] 4. The self-expanding stent in the thrombectomy system can effectively reduce the obstruction to blood flow and ensure smooth blood flow. The self-expanding stent is firmly positioned in the human body and is not easily displaced.

[0042] 5. The self-expanding stent in the thrombectomy system displays different numbers of development marks depending on the specifications. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 is a schematic structural diagram of the thrombus removal system of the present invention;

[0044] Figure 2 It is a schematic diagram of the structure of the self-expanding stent in the expanded state;

[0045] Figure 3 for Figure 2 An enlarged schematic diagram of direction A is shown;

[0046] Figure 4 A schematic diagram of the structure of winding the extension wire around the outer edge of the connecting rod;

[0047] Figure 5 It is a schematic diagram of the structure of a Y-type connector;

[0048] Figure 6 It is a schematic diagram of the structure of a long sheath;

[0049] Figure 7 Schematic diagram of the structure of the microcatheter;

[0050] Figure 8 Schematic diagram of the connection between the Y-type connector, long sheath, microcatheter and extension line.

[0051] 1-protective cap; 2-casing; 3-self-expanding stent, 3.1-front thrombus removal stent, 3.2-middle thrombus removal stent, 3.3-rear thrombus removal stent; 4-first end; 5-first transition curved surface; 6-second transition curved surface; 7-second end; 8-ring; 9-first connecting tube, 9.1-second clamping thread, 9.2-first clamping thread; 10-connecting rod, 10.1-cylindrical first step section, 10.2-cylindrical second step section, 10.3-cylindrical third step section; 11-extension line, 11.1-first line body, 11.2-second line body, 11.3-third line body; 12-handle, 12.1-second bottom wall, 12.2-second top wall, 12.3-first A rear wall; 13-fastening bolts; 14-through holes; 15-pressing block, 15.1-first top wall, 15.2-right side wall, 15.3-left side wall, 15.4-first bottom wall; 16-sealing gasket; 17-Y-type connector, 17.1-Rule connector, 17.2-hollow tube, 17.3-hemostatic valve, 17.4-first connecting tube; 18-connector side branch; 19-middle tube; 20-first valve port; 21-third valve port; 22-syringe; 23-long sheath tube, 23.1-straight tube, 23.2-bent tube, 23.3-second connecting tube; 24-three-way valve; 25-microcatheter, 25.1-long tube, 25.2-conical tube, 25.3-blade. DETAILED DESCRIPTION

[0052] The present invention aims to solve the problems existing in the prior art and provide a thrombus removal system for treating large-sized vascular embolism. Figure 1As shown, the thrombus removal system includes a self-expanding stent 3, a connecting rod 10, a first connecting tube 9, an extension line 11, a pressing block 15, and a handle 12, wherein the self-expanding stent 3, the first connecting tube 9, the connecting rod 10, the extension line 11, and the pressing block 15 are connected in sequence from left to right, and the handle 12 is disposed on the outer sleeve of the extension line 11; the self-expanding stent 3 includes a front thrombus removal stent 3.1, a middle thrombus removal stent 3.2, and a rear thrombus removal stent 3.3, which are connected in series in sequence, the front thrombus removal stent 3.1 is connected to the middle thrombus removal stent 3.2 through a first transition curved surface 5, the middle thrombus removal stent 3.2 is connected to the rear thrombus removal stent 3.3 through a second transition curved surface 6, and the first end 4 of the front thrombus removal stent 3.1 is connected to the middle thrombus removal stent 3.2 through a first transition curved surface 5, and the middle thrombus removal stent 3.2 is connected to the rear thrombus removal stent 3.3 through a second transition curved surface 6. The protective cap 1 is connected, the second end 7 of the rear embolism removal bracket 3.3 is connected to the collar 8 with a thread, and the first end 4 is located in the forward direction of the second end 7; the connecting rod 10 includes a coaxially arranged cylindrical first step section 10.1, a cylindrical second step section 10.2, and a cylindrical third step section 10.3, which are connected in sequence from small to large in diameter, and the outer surface of the cylindrical first step section 10.1 is provided with a collar 8, and the collar 8 is threadedly connected to the second end 7 of the rear embolism removal bracket 3.3. The outer side of the right end of the cylindrical third step section 10.3 is connected to the extension line 11, the first connecting tube 9 is a conical structure, and the first clamping thread 9.1 and the second clamping thread 9.2 are respectively provided on the right and left inner surfaces of the first connecting tube 9, and the second clamping thread 9.2 is connected to the rear embolism removal bracket 3.3 connection, the first clamping thread 9.1 is connected to the cylindrical first step section 10.1, a sealing gasket 16 made of silicone material is installed between the right side of the first connecting pipe 9 and the cylindrical second step section 10.2, the extension line 11 includes a first line body 11.1, a second line body 11.2, and a third line body 11.3, the first line body 11.1, the second line body 11.2, and the third line body 11.3 are wound on the outer surface of the cylindrical third step section 10.3, and the winding length is 5cm. The first line body 11.1, the second line body 11.2, and the third line body 11.3 are woven together in a twist shape and connected to the pressing block 15, and the pressing block 15 includes a first top wall 15.1, a first bottom wall 15.4 and a first top wall 15.1 and a first bottom wall 15.4. 4, the first top wall 15.1 and the first bottom wall 15.4 are arranged in parallel, the left side wall 15.3 and the right side wall 15.2 are fixedly connected to the first top wall 15.1 and the first bottom wall 15.4 respectively, the left side wall 15.3 is provided with a first bayonet (not shown in the figure), the first bayonet is a semi-enclosed structure, and the first bayonet is connected to the right end of the extension line 11, the handle 12 includes a shell sleeved on the extension line 11, the shell includes a second top wall 12.2 and a second bottom wall 12.1 and a first rear wall 12.3 arranged in parallel, the first rear wall 12.3 is connected to the second top wall 12.2 and the second bottom wall 12.1, a gap is left between the second top wall 12.2 and the second bottom wall 12.1, and the second top wall 12.2 is provided with a through hole 14, a compression gasket (not shown in the figure) is provided above the through hole 14, and a fastening bolt 13 is provided above the compression gasket, and the fastening bolt 13 passes through the through hole 14 to compress the extension line 11.

[0053] Furthermore, the front embolus removal bracket 3.1, the middle embolus removal bracket 3.2, and the rear embolus removal bracket 3.3 are all sleeved with a sleeve 2.

[0054] Furthermore, if Figure 5 , Figure 6 , Figure 7 As shown, the thrombectomy system also includes: a Y-shaped connector 17, a microcatheter 25, a long sheath tube 23, and a guide wire (not shown in the figure). The Y-shaped connector 17 is connected to the microcatheter 25, the microcatheter 25 is sleeved in the long sheath tube 23, the guide wire and the extension line 11 are arranged in parallel, and the long sheath tube 23, the microcatheter 25, and the Y-shaped connector 17 are all sleeved outside the guide wire and the extension line 11.

[0055] Furthermore, the length of the microcatheter 25 is greater than the length of the long sheath 23 , the length of the long sheath 23 is greater than the length of the Y-type connector 17 , and the length of the guidewire is greater than the total length of the microcatheter 25 and the Y-type connector 17 .

[0056] Furthermore, if Figure 1 As shown, the fixed connection parts of the first top wall 15.1, the first bottom wall 15.4, the left side wall 15.3 and the right side wall 15.2 are arranged to be rounded structures, and the rounding radius is 1.5 cm.

[0057] Furthermore, the extension cord 11 is coated with a double-layer structure, a surface hydrophilic and lubricating medical coating (not shown in the figure), and the thickness of the surface hydrophilic and lubricating medical coating is 50-80 μm.

[0058] Furthermore, the surface hydrophilic lubricating medical coating has the following components in parts by weight: 7 parts of thickener, 40 parts of deionized water, 5 parts of photoinitiator, 8 parts of wetting agent, 3 parts of surfactant, 25 parts of polyurethane, 10 parts of adhesion promoter, 10 parts of cellulose ester, and 6 parts of catalyst.

[0059] Furthermore, the inner hole of the compression gasket is a threaded structure, the material is alloy spring steel, the thickness is 1.5 to 2 mm, and the shape is flat.

[0060] Furthermore, the diameters of the first connecting tube 9 and the sleeve 2 are both smaller than the inner diameter of the long tube 25.1.

[0061] Furthermore, the diameter of the long tube 25.1 is smaller than the inner diameter of the straight tube 23.1.

[0062] Furthermore, the diameter of the extension line 11 is smaller than the inner diameters of the Y-type connector 17 , the microcatheter 25 , and the long sheath tube 23 .

[0063] Furthermore, the length of the sleeve 2 is shorter than the length of the long tube 25.1.

[0064] Furthermore, the length of the straight tube 23 . 1 is shorter than the length of the long tube 25 . 1 and the sleeve 2 .

[0065] Furthermore, the width of the pressing block 15 is 8-9% of the gap between the second top wall 12.2 and the second bottom wall 12.1.

[0066] Furthermore, the left end of the Luer connector 17.1 is connected to the right end of the cone head tube 25.2 by threads, the long tube 25.1 is movably sleeved in the second connecting tube 23.3 and the straight tube 23.1, and the hollow tube 17.2 and the connector side branch 18 are at 45 degrees.

[0067] Furthermore, the self-expanding stent 3 is of a structure with small ends and a large middle, and is telescopically folded by interweaving a plurality of clockwise curves and a plurality of counterclockwise curves, and a plurality of developing marking blocks (not shown in the figure) are provided at the intersection of the plurality of clockwise curves and the plurality of counterclockwise curves.

[0068] Furthermore, if Figure 3 As shown, the self-expanding stent 3 has an expanded state and a contracted state. The length of the self-expanding stent 3 in the expanded state is 10 cm and the diameter is 8 cm. The length of the self-expanding stent 3 in the contracted state is 15 cm and the diameter is 3 cm.

[0069] Furthermore, if Figure 5 As shown, the Y-type connector 17 includes a Luer connector 17.1, a hemostatic valve 17.3, a hollow tube 17.2, and a first connecting tube 17.4. The Luer connector 17.1 is connected to the hemostatic valve 17.3 through the hollow tube 17.2. The first connecting tube 17.4 is provided on the hollow tube 17.2. The hollow tube 17.2 and the first connecting tube 17.4 are connected through a connector side branch 18. The first connecting tube 17.4 is connected to the first valve port 20 of the three-way valve 24 through the intermediate tube 19, and the third valve port 21 of the three-way valve 24 is connected to the syringe 22.

[0070] Furthermore, if Figure 6 As shown, the long sheath tube 23 includes a straight tube 23.1, a curved tube 23.2, and a second connecting tube 23.3. The left end of the second connecting tube 23.3 is connected to the straight tube 23.1, and the upper edge of the second connecting tube 23.3 is connected to the curved tube 23.2. The straight tube 23.1, the curved tube 23.2, and the second connecting tube 23.3 are an integrated tube. There is no weld at the connection between the straight tube 23.1, the curved tube 23.2 and the second connecting tube 23.3, and the curved tube 23.2 is connected to the three-way valve 24.

[0071] Furthermore, if Figure 7As shown, the microcatheter 25 includes a long tube 25.1, a cone-shaped tube 25.2, and blades 25.3. The long tube 25.1 is connected to the left end of the cone-shaped tube 25.2, the left end and the right end of the cone-shaped tube 25.2 are both connected, and two blades 25.3 are symmetrically fixed on the outer side of the cone-shaped tube 25.2.

[0072] The present invention further provides a method for using a thrombectomy system for treating large-sized vascular embolism, comprising the following steps:

[0073] Step 1, the guide wire is sent to the thrombus position through the long sheath tube 23;

[0074] Step 2, delivering the microcatheter 25 to 10 mm distal to the thrombus;

[0075] Step 3, removing the guide wire from the microcatheter 25;

[0076] Step 4, when the cannula 2 is inserted halfway into the hemostatic valve 17.3, release the hemostatic valve 17.3;

[0077] Step 5, deliver the cannula 2 to the interface of the microcatheter 25, and tighten the hemostatic valve 17.3;

[0078] Step 6, the self-expanding stent 3 is delivered into the microcatheter 25, and the sheath 2 is removed;

[0079] Step 7, the handle 12 controls and pushes the extension wire 11 until the self-expanding stent 3 is flush with the end of the microcatheter 25;

[0080] Step 8, push the extension wire 11, withdraw the microcatheter 25, and release the self-expanding stent for 3-5 minutes;

[0081] Step 9, the thrombus is embedded in the self-expanding stent 3, and the self-expanding stent 3 and the microcatheter 25 are withdrawn as a whole;

[0082] Step 10, using the syringe 22 to perform negative pressure suction on the microcatheter 25;

[0083] Step 11, the microcatheter 25 is advanced to the proximal end of the long sheath tube 23, the hemostatic valve 17.3 is disconnected, and the self-expanding stent 3, the microcatheter 25, and the hemostatic valve 17.3 are withdrawn as a whole to complete the thrombus removal.

[0084] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A thrombectomy system for treating large-sized vascular embolism, characterized in that: The thrombus removal system comprises: a self-expanding stent, a first connecting tube, a connecting rod, an extension line, a pressing block, and a handle, wherein the self-expanding stent, the first connecting tube, the connecting rod, the extension line, and the pressing block are sequentially connected from left to right, and a handle is disposed on the extension line outer cover; The self-expanding stent includes a front thrombectomy stent, a middle thrombectomy stent, and a rear thrombectomy stent, which are connected in series in sequence, the front thrombectomy stent is connected to the middle thrombectomy stent via a first transition curved surface, the middle thrombectomy stent is connected to the rear thrombectomy stent via a second transition curved surface, the first end of the front thrombectomy stent is connected to a threaded protective cap, the second end of the rear thrombectomy stent is connected to a threaded ferrule, the first end is located in the forward direction of the second end, and the self-expanding stent has a length of 15 cm and a diameter of 3 cm in a contracted state; The connecting rod comprises a cylindrical first step section, a cylindrical second step section, and a cylindrical third step section which are coaxially arranged and connected in order from small to large diameters. A ferrule is provided on the outer surface of the cylindrical first step section, and the ferrule is threadedly connected to the second end of the rear thrombus removal bracket. The outer side of the right end of the cylindrical third step section is connected to the extension line. The first connecting tube is a conical structure, and a first clamping thread and a second clamping thread are respectively provided on the right and left inner surfaces of the first connecting tube, the second clamping thread is connected to the rear bolt removal bracket, the first clamping thread is connected to the cylindrical first step section, and a sealing gasket made of silicone material is installed between the right side of the first connecting tube and the cylindrical second step section; The extension line includes a first line body, a second line body, and a third line body, which are wound around the outer surface of the cylindrical third step section, with a winding length of 5 cm, and the first line body, the second line body, and the third line body are woven together into a twist shape and connected to the pressing block; The pressing block includes a first top wall, a first bottom wall, and a left side wall and a right side wall arranged between the first top wall and the first bottom wall, the first top wall is arranged parallel to the first bottom wall, the left side wall and the right side wall are fixedly connected to the first top wall and the first bottom wall respectively, a first bayonet is provided on the left side wall, the first bayonet is a semi-enclosed structure, the first bayonet is connected to the right end of the extension line, and the fixed connection of the first top wall, the first bottom wall, the left side wall and the right side wall is arranged to be a chamfered structure, and the chamfered radius is 1.5 cm; The handle comprises a shell sleeved on the extension line, the shell comprises a second top wall and a second bottom wall and a first rear wall which are arranged in parallel, the first rear wall is connected with the second top wall and the second bottom wall, a gap is left between the second top wall and the second bottom wall, a through hole is provided on the second top wall, a compression gasket is provided above the through hole, a fastening bolt is provided above the compression gasket, the fastening bolt presses the extension line through the through hole, a double-layer structure of a surface hydrophilic lubricating medical coating is coated on the outside of the extension line, the thickness of the coating is 50 to 80 μm, and the surface hydrophilic lubricating medical coating comprises the following components in parts by weight: 7 parts of thickener, 40 parts of deionized water, 5 parts of photoinitiator, 8 parts of wetting agent, 3 parts of surfactant, 25 parts of polyurethane, 10 parts of adhesion promoter, 10 parts of cellulose ester, and 6 parts of catalyst; The front embolus retrieval bracket, the middle embolus retrieval bracket, and the rear embolus retrieval bracket are all sheathed with sleeves; It also includes: a Y-shaped connector, a microcatheter, a long sheath tube, and a guide wire, wherein the Y-shaped connector is connected to the microcatheter, the microcatheter is sheathed in the long sheath tube, the guide wire and the extension wire are arranged in parallel, and the long sheath tube, the microcatheter, and the Y-shaped connector are all sheathed outside the guide wire and the extension wire; the length of the microcatheter is greater than the length of the long sheath tube, the length of the long sheath tube is greater than the length of the Y-shaped connector, and the length of the guide wire is greater than the total length of the microcatheter and the Y-shaped connector; The Y-type connector includes a Luer connector, a hemostatic valve, a hollow tube, and a first connecting tube. The Luer connector is connected to the hemostatic valve through the hollow tube. The first connecting tube is provided on the hollow tube. The hollow tube and the first connecting tube are connected through a connector side branch. The first connecting tube is connected to the first valve port of the three-way valve through the intermediate tube. The third valve port of the three-way valve is connected to the syringe. The long sheath tube includes a straight tube, a curved tube, and a second connecting tube. The left end of the second connecting tube is connected to the straight tube, and the upper edge of the second connecting tube is connected to the curved tube. The straight tube, the curved tube, and the second connecting tube are an integrated tube. There is no weld at the connection between the straight tube, the curved tube, and the second connecting tube. The curved tube is connected to the three-way valve. The microcatheter comprises a long tube, a cone-shaped tube and blades. The long tube is connected with the left end of the cone-shaped tube, the left end and the right end of the cone-shaped tube are both connected, and two blades are symmetrically fixed on the outer side of the cone-shaped tube.

2. The thrombectomy system for treating large-sized vascular embolism according to claim 1, characterized in that: The self-expanding stent has a structure with small ends and a large middle, and is telescopically folded by interweaving multiple clockwise curves and multiple counterclockwise curves. Several development marking blocks are provided at the intersection of the multiple clockwise curves and multiple counterclockwise curves.

3. The thrombectomy system for treating large-sized vascular embolism according to claim 1, characterized in that: The inner hole of the compression gasket is a threaded structure, the material is alloy spring steel, the thickness is 1.5-2mm, and the shape is flat.

4. The thrombectomy system for treating large-sized vascular embolism according to claim 1, characterized in that: The diameters of the first connecting pipe and the sleeve are both smaller than the inner diameter of the long pipe; The diameter of the long tube is smaller than the inner diameter of the straight tube; The diameter of the extension wire is smaller than the inner diameter of the Y-connector, microcatheter, and long sheath; The length of the sleeve is shorter than the length of the long tube; The length of the straight tube is shorter than that of the long tube and the sleeve; The width of the pressing block is 8-9% of the gap between the second top wall and the second bottom wall.

5. The thrombectomy system for treating large-sized vascular embolism according to claim 1, characterized in that: The left end of the Luer connector is connected to the right end of the cone-shaped tube through threads, the long tube is movably sleeved in the second connecting tube and the straight tube, and the hollow tube and the connector side branch are at 45 degrees.

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