Crimping type multi-section developing thrombectomy stent system

Abstract

The invention discloses a crimped multi-section developing thrombectomy stent system, and belongs to the technical field of medical equipment. The device mainly comprises a holding pipe, and a liquid injection pipe is arranged on the holding pipe; an injection mechanism; the sleeve is installed on the holding pipe, and the sleeve is provided with a sliding groove formed in the axial direction; the pulling and holding part is installed on the sliding groove in a sliding mode, a spring is fixedly installed between the pulling and holding part and the holding pipe, and a steel wire is rotatably installed on the pulling and holding part; the connecting pipe is installed on the holding pipe, and an internal thread is arranged in the connecting pipe; the threaded pipe is installed in the holding pipe in a sliding mode, and external threads are arranged on the outer ring of the threaded pipe; the thrombectomy mechanism is mounted at the tail end of the steel wire, and the thrombectomy mechanism is provided with a silk screen. According to the curling type multi-section developing thrombus extraction support system, the threaded pipe and the blocking ring are arranged, so that in the thrombus extraction process of the thrombus extraction mechanism, the silk screen at the head of the thrombus extraction mechanism can rotate, and thrombus is slightly scattered.

Description

Technical Field

[0001] The present application relates to the technical field of medical equipment, and in particular to a retractable multi-segment developing thrombectomy stent system. Background Art

[0002] Acute ischemic stroke is a neurological injury caused by local brain ischemia and necrosis due to sudden blockage of cerebral blood flow. It is a major cause of death and disability in the elderly. With the continuous increase in the elderly population and the improvement of living standards, the incidence of cerebrovascular disease continues to rise. Recanalization of blood vessels is the key to the treatment of acute ischemic stroke. Currently, the conventional methods for the treatment of acute ischemic stroke include two categories: intravascular thrombolysis and mechanical thrombectomy.

[0003] Intravascular thrombolysis is a method in which a catheter is used to inject thrombolytic agents into the vicinity of the lesion in the blood vessel where the lesion is located. A very high concentration of thrombolytic agents is instantly formed in the local lesion, which accelerates the dissolution of the thrombus and increases the chance of recanalization of the blood vessel. First, intravenous thrombolysis should be performed within 3 hours of onset, and the time window for arterial thrombolysis is within 6 hours. Very few patients can receive thrombolytic therapy; secondly, thrombolytic therapy is only suitable for smaller thrombi, and is not ideal for large and small thrombi; thrombolysis requires a very large dose of thrombolytic drugs to dissolve it, but this is prone to various complications and has a high risk. In order to solve the problems of intravascular thrombolysis, for patients who are not suitable for drug thrombolysis, mechanical thrombectomy is used to remove the embolic thrombus.

[0004] Mechanical thrombectomy is a technical method that involves puncturing the femoral artery, passing the thrombectomy device through the blood vessel to the location of the vascular occlusion, and then passing through the occluded blood vessel to remove the thrombus through a thrombectomy stent or thrombectomy catheter to restore blood flow in the blood vessel.

[0005] However, when the thrombus is removed by the thrombus removal stent, if the adhesion of the thrombus is strong, the retraction of the thrombus removal stent will be hindered, and the thrombus removal stent may be deformed, so that the thrombus cannot be completely brought into the catheter, resulting in incomplete removal of the thrombus. Therefore, it is necessary to provide a retractable multi-segment development thrombus removal stent system to solve the above problems.

[0006] It should be noted that the above information disclosed in this background technology section is only for understanding the background technology of the present application concept, and therefore, it may contain information that does not constitute the prior art. Summary of the invention

[0007] Based on the above problems existing in the prior art, the problem to be solved by the present application is to provide a retractable multi-segment developing thrombectomy stent system, which solves the problem of incomplete thrombus removal due to strong thrombus adhesion.

[0008] The technical solution adopted by the present application to solve its technical problems is: a retractable multi-stage developing thrombus removal bracket system, comprising a holding tube, on which an injection tube is arranged; an injection mechanism, which is suitable for connecting with the injection tube to facilitate injecting developer into the injection tube; a sleeve, which is installed on the holding tube, and the sleeve has a slide groove arranged along the axial direction; a holding part, which is slidably installed on the slide groove, a spring is fixedly installed between the holding part and the holding tube, and a steel wire is rotatably installed on the holding part; a connecting tube, which is installed on the holding tube, and the interior of the connecting tube is provided with an internal thread; a threaded tube, which is slidably installed on the interior of the holding tube, and the outer ring of the threaded tube is provided with an external thread; a thrombus removal mechanism, which is installed at the end of the steel wire, and the thrombus removal mechanism has a wire mesh; the wire mesh is suitable for extending into the thrombus removal position and removing the thrombus, and the wire mesh is suitable for rotating to break up the thrombus with strong adhesion.

[0009] Furthermore, a hanging ring is installed at a position of the sleeve away from the holding tube, and the width of the slide groove gradually narrows along a direction approaching the hanging ring.

[0010] Furthermore, the thrombus removal mechanism includes a head installed at one end of the steel wire, and a connecting tube is installed on the head; a flower-shaped head is provided at one end of the connecting tube away from the head, and the flower-shaped head has at least three protrusions, and grooves are provided inside the protrusions. A through hole is provided at the center of the connecting tube, and the hole is connected to the groove; a rotating shaft is installed inside the groove, and a gear is rotatably installed on the rotating shaft; a tail post is slidably arranged in the hole, and an avoidance groove is provided at the position of the tail post close to the flower-shaped head, and a rack is installed in the avoidance groove, and the rack and the gear are meshed with each other; a wire mesh is installed on the tail post at a position away from the rack.

[0011] Furthermore, a connecting ring is sleeved on the outer ring of the connecting tube, a protective sleeve is sleeved on the connecting ring, and the protective sleeve is located on the outer ring of the wire mesh.

[0012] Furthermore, the rack is divided into front teeth close to the tail column and rear teeth away from the tail column, the front teeth are meshed with the gear, and the rear teeth are in a locked state with the gear.

[0013] Furthermore, the injection tube is connected with a plug, and the end of the plug is provided with a threaded portion;

[0014] The injection mechanism comprises a syringe, a liquid outlet end of the syringe is provided with a connecting sleeve, and an outer ring of the connecting sleeve is provided with an external thread.

[0015] Furthermore, a blocking ring is installed inside the threaded tube, and a matching ring matching the head is provided on the blocking ring;

[0016] The sealing head is provided with a boss, and the blocking ring is provided with a groove matched with the boss.

[0017] Furthermore, the sealing head is provided with a plurality of groups of through drainage holes.

[0018] Furthermore, the threaded tube is internally through-arranged, and the inner diameter of the threaded tube is larger than the outer diameter of the connecting tube.

[0019] Furthermore, a connecting wing is installed at the middle position of the sleeve, and a grip ring is installed on the connecting wing.

[0020] The beneficial effects of the present application are as follows: the present application provides a retractable multi-segment development thrombectomy stent system, which has the following beneficial effects:

[0021] 1. By providing a thrombectomy mechanism, the thrombectomy mechanism can be introduced through the catheter until the thrombus is reached, and then the thrombus is brought into the catheter by the withdrawal of the thrombectomy mechanism, thereby completing the thrombectomy operation.

[0022] 2. By providing an injection mechanism, the contrast agent can be injected until the thrombus is reached, so that the position of the thrombus can be captured by the device, thereby achieving the purpose of guiding the thrombus removal operation.

[0023] 3. By providing a threaded tube and a blocking ring, the wire mesh at the head of the thrombus removal mechanism can rotate during the thrombus removal process to slightly break up the thrombus, thereby solving the problem of strong adhesion between the thrombus and the blood vessel, making it difficult to remove.

[0024] In addition to the above-described purposes, features and advantages, the present application also has other purposes, features and advantages. The present application will be further described in detail with reference to the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings in the specification, which constitute a part of the present application, are used to provide further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute improper limitations on the present application.

[0026] In the attached picture:

[0027] Figure 1 It is an overall schematic diagram of a retractable multi-segment development thrombectomy stent system in the present application;

[0028] Figure 2 for Figure 1 Exploded schematic diagram of the overall structure;

[0029] Figure 3 for Figure 2 Schematic diagram of the local structure at A in the middle;

[0030] Figure 4 for Figure 2 Schematic diagram of the local structure at B in the middle;

[0031] Figure 5 for Figure 4 Schematic diagram of the local structure at C in the middle;

[0032] Figure 6 for Figure 1 Schematic diagram of the exploded structure of the middle grip mechanism;

[0033] Figure 7 for Figure 6 Schematic diagram of the local structure at D in the middle;

[0034] Figure 8 for Figure 6 Schematic diagram of the local structure at E in the middle;

[0035] Fig. 9 for Figure 6 Schematic diagram of the local structure at F in the middle;

[0036] Fig.10 for Figure 4 Schematic diagram of the explosion structure of the thrombus removal mechanism;

[0037] Fig.11 for Fig.10 Schematic diagram of the local structure at G in the middle;

[0038] Fig.12 for Fig.10 Schematic diagram of the local structure at H in the middle;

[0039] Among them, the reference numerals in the figure are:

[0040] 1. Holding mechanism; 11. Holding tube; 12. Connecting tube; 13. Hanging ring; 14. Gripping ring; 16. Sleeve; 17. Threaded tube; 18. Holding part; 19. Connecting wing; 110. Steel wire; 111. Injection tube; 112. Plug; 113. Threaded part; 114. Connecting part; 115. Slide; 116. End cap; 117. Boss; 118. Blocking ring; 119. Groove;

[0041] 2. injection mechanism; 21. syringe; 22. connecting sleeve;

[0042] 3. Catheter;

[0043] 4. Protective cover;

[0044] 5. Bolt removal mechanism; 51. Connecting tube; 52. Connecting ring; 53. Wire mesh; 54. Tail column; 55. Avoidance groove; 56. Rack; 561. Front teeth; 562. Rear teeth; 57. Flower-shaped head; 58. Hole; 59. Groove; 510. Gear; 511. Rotating shaft; 512. Connecting rope. DETAILED DESCRIPTION

[0045] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0046] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0047] Embodiment 1:

[0048] This embodiment describes the device and principle for mechanically removing thrombus, specifically:

[0049] like Figure 1 As shown, the present application provides a retractable multi-segment development thrombectomy stent system, including a holding mechanism 1, which is used to facilitate hand-held operation by medical personnel;

[0050] like Figure 6-Figure 7 and Fig. 9 As shown, the holding mechanism 1 includes a holding tube 11, on which a sleeve 16 is installed. It should be noted that a connecting portion 114 is provided at a position of the sleeve 16 close to the holding tube 11, and the connecting portion 114 is an external thread. Meanwhile, an internal thread is provided inside the holding tube 11, so that the holding tube 11 and the sleeve 16 can be fastened and installed by the cooperation of the internal thread and the external thread.

[0051] At the same time, a connecting wing 19 is fixedly installed in the middle position of the sleeve 16, and a grip ring 14 is fixedly installed on the connecting wing 19, and the grip ring 14 is used for medical staff to hold the operation;

[0052] A hanging ring 13 is fixedly installed at a position of the sleeve 16 away from the holding tube 11, and the hanging ring 13 is used to hang the holding mechanism 1 so as to free the hands of medical staff when not in use;

[0053] Continue to refer Figure 6-Figure 7A slide groove 115 penetrating the sleeve 16 is provided on both sides of the outer ring of the sleeve 16, and a holding portion 18 is slidably provided on the slide groove 115. The holding portion 18 is located inside the sleeve 16, and the outer end of the holding portion 18 extends out of the sleeve 16 through the slide groove 115, so that the medical staff can hold the holding portion 18 and push the holding portion 18 to slide on the slide groove 115;

[0054] In the present application, a spring (not shown in the figure) is fixedly installed between the pulling portion 18 and the holding tube 11, so that in the initial state, the pulling portion 18 is located in the sleeve 16 near the holding tube 11, and the medical staff can pull the pulling portion 18 along the direction of the slide groove 115 toward the hanging ring 13;

[0055] Preferably, the width of the slide groove 115 gradually narrows along the direction close to the hanging ring 13, so that when the holding portion 18 moves to the limit position in the direction of the hanging ring 13, it will be stuck in the narrow slide groove 115 and cannot be reset;

[0056] At the same time, a steel wire 110 is installed on a bearing at a position of the holding portion 18 close to the holding tube 11. The steel wire 110 is adapted to move synchronously with the holding portion 18. At the same time, the steel wire 110 passes through the sleeve 16 and the holding tube 11 at a position away from the holding portion 18, and extends to the outside of the holding tube 11.

[0057] A connecting tube 12 is fixedly installed at a position of the holding tube 11 away from the sleeve 16. The connecting tube 12 is relatively long and extends into the blood vessel.

[0058] It should be noted that when performing a thrombus removal operation, it is first necessary to use a puncture needle to perform arterial puncture, then establish a vascular channel through an indwelling needle, and insert the catheter 3 into the blood vessel under the guidance of a guide wire to reach the location of the thrombus blockage;

[0059] At this time, the connecting tube 12 can be inserted into the catheter 3 and prepared for subsequent mechanical thrombectomy.

[0060] like Figure 2 and Figure 4-Figure 5 As shown, a sealing head 116 is fixedly installed at a position of the steel wire 110 away from the holding portion 18, and a thrombus removal mechanism 5 is installed at one end of the sealing head 116 away from the steel wire 110, and the thrombus removal mechanism 5 is used to remove the thrombus in the blood vessel;

[0061] The thrombus removal mechanism 5 includes a sealing head 116 fixedly mounted on one end of the steel wire 110, and a connecting tube 51 is fixedly mounted on the sealing head 116, so that the connecting tube 51 can move synchronously with the steel wire 110;

[0062] like Figure 10-12As shown, a flower-shaped head 57 is provided at one end of the connecting tube 51 away from the sealing head 116, and the flower-shaped head 57 has at least three protrusions (not shown in the figure), and a groove 59 is provided inside the protrusion, and a through hole 58 is provided at the center of the connecting tube 51, and the hole 58 is communicated with the groove 59;

[0063] At the same time, a rotating shaft 511 is fixedly installed inside the groove 59, and a gear 510 is rotatably installed on the rotating shaft 511, so that the gear 510 can rotate around the rotating shaft 511, and the outer ends of the flower-shaped heads 57 are extended from both ends of the rotating shaft 511, and are fixedly connected with a connecting rope 512, and the connecting rope 512 is fixed to the outer ring of the connecting tube 51 at a position away from the rotating shaft 511, so that the stability of the connection of the rotating shaft 511 can be increased through the connecting rope 512, thereby enhancing the stability of the gear 510 during rotation.

[0064] Continue to refer Figure 10-11 A tail post 54 is slidably arranged in the hole 58, and an avoidance groove 55 is arranged at a position of the tail post 54 near the pattern head 57. A rack 56 is fixedly installed in the avoidance groove 55, and the rack 56 is meshed with the gear 510. When the gear 510 rotates, the rack 56 can be driven to translate, thereby driving the tail post 54 to retract into the hole 58 or extend out of the hole 58;

[0065] Meanwhile, a wire mesh 53 is fixedly installed on the tail column 54 at a position away from the rack 56, and the wire mesh 53 is used to capture the thrombus and bring the thrombus into the catheter 3;

[0066] In order to store the screen 53 in the initial state, as shown in FIG. Figure 4 As shown, a connecting ring 52 is fixedly sleeved on the outer ring of the connecting tube 51, and a protective sleeve 4 is fixedly sleeved on the connecting ring 52. The protective sleeve 4 is located on the outer ring of the wire mesh 53, so that in the initial state, the wire mesh 53 can be stored in the protective sleeve 4, and the wire mesh 53 has a certain elasticity, so that when the wire mesh 53 is stored in the protective sleeve 4, the outer ring diameter of the wire mesh 53 can be changed by winding and rotating, so as to facilitate better storage, and when the wire mesh 53 is out of the protective sleeve 4, it can be rotated outward and expanded under the action of elastic force;

[0067] In summary, after the connecting tube 12 is inserted into the catheter 3, the medical staff moves the front end of the connecting tube 12 to the location of the thrombus;

[0068] Then the medical staff holds the holding portion 18 and pulls the holding portion 18 toward the hanging ring 13. During the sliding process of the holding portion 18, the steel wire 110 is driven to move synchronously, and the connecting tube 51 is pulled synchronously toward the connecting tube 12 through the sealing head 116 (refer to Figure 5 );

[0069] When the connecting tube 51 moves, the pattern head 57 and the gear 510 are driven to move, because the gear 510 is in meshing state with the rack 56, so the gear 510 is driven by the connecting tube 51 to rotate on the rack 56;

[0070] At the same time, because the tail post 54 and the hole 58 are slidably mounted, when the gear 510 rotates on the rack 56, the tail post 54 will slowly come out of the hole 58, and because the protective cover 4 and the connecting tube 51 are fixedly connected, the wire mesh 53 on the tail post 54 will slowly come out of the protective cover 4 and be in the blood vessel. At the same time, the wire mesh 53 changes from a curled state stored in the protective cover 4 to an expanded state, so as to better remove the thrombus;

[0071] In this embodiment, the rack 56 is divided into a front tooth 561 close to the tail post 54 and a rear tooth 562 away from the tail post 54, wherein the front tooth 561 is meshed with the gear 510, and the rear tooth 562 is in a locked state with the gear 510, that is, when the gear 510 moves to the position of the rear tooth 562, the gear 510 cannot rotate;

[0072] As the steel wire 110 is continuously pulled, the gear 510 changes from the meshing state with the front teeth 561 to the stuck state with the rear teeth 562. As a result, under the action of the steel wire 110, the gear 510 will synchronously pull the tail post 54 through the action of the rear teeth 562, and drive the wire mesh 53 to be synchronously pulled toward the direction of the catheter 3.

[0073] When the screen 53 moves toward the catheter 3, the thrombus will be driven to move synchronously, and then the thrombus can be brought into the catheter 3 and the thrombus can be removed.

[0074] In this application, in order to better guide the thrombus removal operation, it is necessary to input the contrast agent into the thrombus position so that the thrombus situation can be captured by the device. In order to achieve the above purpose, Figure 2-Figure 3 as well as Figure 8 As shown, a liquid injection tube 111 is provided on the side of the holding tube 11, the interior of the liquid injection tube 111 is communicated with the holding tube 11, and an internal thread is provided at the internal port of the liquid injection tube 111;

[0075] At the same time, a plug 112 is connected to the injection tube 111, and a threaded portion 113 is provided at the end of the plug 112, so that in the initial state, the injection tube 111 can be thread-sealed by the plug 112;

[0076] like Figure 2As shown, an injection mechanism 2 may be provided on one side of the injection tube 111, the injection mechanism 2 comprising a syringe 21, a connecting sleeve 22 is provided at the liquid outlet end of the syringe 21, and an outer ring of the connecting sleeve 22 is provided with an external thread to facilitate connection with the internal thread of the injection tube 111;

[0077] Therefore, when performing thrombus removal, the syringe 21 can be connected to the injection tube 111 through the connecting sleeve 22, and the developer can be input into the injection tube 111. The developer reaches the position of the thrombus through the injection tube 111, the holding tube 11, the connecting tube 12 and the connecting tube 51, and the thrombus is positioned by contrast imaging.

[0078] At the same time, during the process of thrombus removal, by tracking the location of the thrombus in real time, the entire process of thrombus removal can be clearly understood, providing guidance and instruction for the thrombus removal operation.

[0079] In this embodiment, if Figure 5 As shown, a plurality of through drainage holes (not shown) are provided on the sealing head 116 to guide the contrast agent so that the contrast agent can reach the location of the thrombus.

[0080] Embodiment 2:

[0081] When the thrombus is removed by the thrombus removal stent, if the thrombus adhesion is strong, the movement of the thrombus removal stent to retreat will be hindered, and the thrombus removal stent may be deformed, so that the thrombus cannot be completely brought into the catheter 3, and the thrombus removal is incomplete;

[0082] In order to solve the above problems, this embodiment provides an auxiliary thrombus removal structure, specifically:

[0083] like Figure 5-Figure 6 As shown, a threaded tube 17 is slidably disposed inside the gripping tube 11, and the threaded tube 17 extends into the interior of the connecting tube 12. Meanwhile, an outer ring of the threaded tube 17 is provided with an external thread, and an inner ring of the connecting tube 12 is provided with an internal thread, so that when the threaded tube 17 slides inside the gripping tube 11, it can rotate by the cooperation of the external thread and the internal thread;

[0084] Meanwhile, the threaded tube 17 is internally through-set, and the inner diameter of the threaded tube 17 is larger than the outer diameter of the connecting tube 51, so that when the connecting tube 51 is pulled by the steel wire 110, it will slide inside the threaded tube 17;

[0085] A blocking ring 118 is fixedly installed inside the threaded tube 17, and the blocking ring 118 is used to block the connecting tube 51, so that when the connecting tube 51 reaches the position of the blocking ring 118, if the steel wire 110 continues to pull the connecting tube 51 to move, the threaded tube 17 will be driven to slide synchronously in the holding tube 11;

[0086] Continue to refer Figure 5-Figure 6 A matching ring (not shown) matching with the head 116 is provided on the blocking ring 118, so that the head 116 can enter the inside of the blocking ring 118 and be embedded in the blocking ring 118. At the same time, a boss 117 is provided on the head 116, and a groove 119 matching with the boss 117 is provided in the blocking ring 118, so that the boss 117 can be inserted into the groove 119, and the head 116 and the blocking ring 118 are completely embedded;

[0087] In summary, in the initial state, under the action of the spring between the holding portion 18 and the holding tube 11, the holding portion 18 is located in the sleeve 16 near the holding tube 11, at which time the sealing head 116 is located at the outer end of the threaded tube 17, and the wire mesh 53 is received in the protective sleeve 4;

[0088] When the medical staff pulls the holding portion 18 along the direction of the slide groove 115 toward the hanging ring 13, the connecting tube 51 moves synchronously and drives the protective sleeve 4 to move, so as to release the wire mesh 53, so that the wire mesh 53 is located at the position of the thrombus;

[0089] As the pulling portion 18 continues to pull, the steel wire 110 drives the sealing head 116 into the interior of the threaded tube 17 until the sealing head 116 is embedded in the blocking ring 118, and at this time, the wire mesh 53 is also completely released from the protective sleeve 4;

[0090] Then, the pulling portion 18 continues to pull, and due to the action of the blocking ring 118, the sealing head 116 drives the blocking ring 118 to move synchronously, thereby driving the threaded tube 17 to slide in the holding tube 11;

[0091] When the threaded tube 17 starts to slide, it will start to rotate in the connecting tube 12, so that the threaded tube 17 performs a spiral sliding operation, thereby driving the blocking ring 118 to rotate synchronously;

[0092] During the rotation of the blocking ring 118, the boss 117 and the groove 119 cooperate to synchronously drive the head 116 to rotate. It should be noted that even if the boss 117 and the groove 119 are misaligned in the initial state, when the blocking ring 118 starts to rotate, the boss 117 and the groove 119 will gradually enter a matching state, and because the steel wire 110 and the holding part 18 are rotatably installed, the steel wire 110 will also rotate synchronously;

[0093] When the head 116 rotates, it will drive the connecting tube 51 to rotate, and then drive the tail column 54 to rotate through the cooperation of the gear 510 and the rack 56. The rotation of the tail column 54 will synchronously drive the screen 53 to rotate, so as to slightly break up the thrombus, thereby solving the problem of strong adhesion between the thrombus and the blood vessel, making it difficult to remove.

[0094] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A retractable multi-stage imaging thrombectomy stent system, characterized in that: include: A holding tube (11), wherein a liquid injection tube (111) is provided on the holding tube (11); An injection mechanism (2), the injection mechanism (2) being suitable for being connected to the liquid injection tube (111) so as to inject developer into the liquid injection tube (111); A sleeve (16), the sleeve (16) being mounted on the holding tube (11), the sleeve (16) having a slide groove (115) arranged along the axial direction; A holding portion (18), the holding portion (18) is slidably mounted on the slide groove (115), a spring is fixedly mounted between the holding portion (18) and the holding tube (11), and a steel wire (110) is rotatably mounted on the holding portion (18); A connecting pipe (12), the connecting pipe (12) being mounted on the holding pipe (11), the interior of the connecting pipe (12) being provided with an internal thread; A threaded tube (17), the threaded tube (17) being slidably mounted inside the holding tube (11), and an outer ring of the threaded tube (17) being provided with an external thread; A thrombus removal mechanism (5), which is installed at the end of the steel wire (110), and has a wire mesh (53); Wherein: the wire mesh (53) is suitable for extending into the thrombus removal position and removing the thrombus, and the wire mesh (53) is suitable for rotating to break up the thrombus with strong adhesion.

2. The retractable multi-stage developing thrombectomy stent system according to claim 1, characterized in that: A hanging ring (13) is installed at a position of the sleeve (16) away from the holding tube (11), and the width of the sliding groove (115) gradually narrows along a direction approaching the hanging ring (13).

3. The retractable multi-stage developing thrombectomy stent system according to claim 2, characterized in that: The thrombus removal mechanism (5) comprises a sealing head (116) installed at one end of the steel wire (110), and a connecting tube (51) is installed on the sealing head (116); A flower-shaped head (57) is arranged at one end of the connecting tube (51) away from the sealing head (116), the flower-shaped head (57) having at least three protrusions, a groove (59) being arranged inside the protrusions, a through hole (58) being arranged at the center of the connecting tube (51), the hole (58) being communicated with the groove (59); A rotating shaft (511) is installed inside the groove (59), and a gear (510) is rotatably installed on the rotating shaft (511); A tail post (54) is slidably arranged in the hole (58), a avoidance groove (55) is arranged at a position of the tail post (54) close to the flower head (57), a rack (56) is installed in the avoidance groove (55), and the rack (56) and the gear (510) are meshed with each other; A wire mesh (53) is installed on the tail column (54) at a position away from the rack (56).

4. The retractable multi-stage developing thrombectomy stent system according to claim 3, characterized in that: A connecting ring (52) is sleeved on the outer ring of the connecting tube (51), a protective sleeve (4) is sleeved on the connecting ring (52), and the protective sleeve (4) is located on the outer ring of the wire mesh (53).

5. The retractable multi-stage developing thrombectomy stent system according to claim 4, characterized in that: The rack (56) is divided into front teeth (561) close to the tail post (54) and rear teeth (562) away from the tail post (54); the front teeth (561) are meshed with the gear (510), and the rear teeth (562) are in a locked gear state with the gear (510).

6. The retractable multi-stage developing thrombectomy stent system according to claim 5, characterized in that: The liquid injection pipe (111) is connected to a plug (112), and the end of the plug (112) is provided with a threaded portion (113); The injection mechanism (2) comprises a syringe (21), a liquid outlet end of the syringe (21) is provided with a connecting sleeve (22), and an outer ring of the connecting sleeve (22) is provided with an external thread.

7. The retractable multi-stage developing thrombectomy stent system according to claim 3, characterized in that: A blocking ring (118) is installed inside the threaded tube (17), and a matching ring matching the sealing head (116) is provided on the blocking ring (118); The sealing head (116) is provided with a boss (117), and the blocking ring (118) is provided with a groove (119) that matches the boss (117).

8. The retractable multi-stage developing thrombectomy stent system according to claim 7, characterized in that: The sealing head (116) is provided with a plurality of groups of through drainage holes.

9. The retractable multi-stage developing thrombectomy stent system according to claim 8, characterized in that: The threaded tube (17) is arranged to penetrate the inside, and the inner diameter of the threaded tube (17) is larger than the outer diameter of the connecting tube (51).

10. The retractable multi-stage developing thrombectomy stent system according to claim 1, characterized in that: A connecting wing (19) is installed at the middle position of the sleeve (16), and a grip ring (14) is installed on the connecting wing (19).

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