A trocar applied to a model of middle cerebral artery occlusion

Abstract

The application discloses a trocar applied to a middle cerebral artery occlusion model and relates to the field of medical devices, and solves the problem of poor stability of a needle core after insertion of the existing trocar, and the trocar comprises a puncture needle, a sleeve, an inner needle and a wire plug, one end of the wire plug is provided with a plug body, the sleeve is fixedly connected with a wing plate on the outside, the end of the inner needle, which is away from the plug body, is movably sleeved with an insertion block, the outside of the insertion block is provided with an insertion sleeve, the top of the insertion block is fixedly provided with a top plate which is sleeved on the outside of the inner needle, one end of the inner needle, which is close to the insertion block, is fixedly connected with a handle, and the inside of the insertion sleeve is provided with a swing adjusting mechanism for swing adjustment of the inner needle, the swing adjusting mechanism enables the inner needle to be slowly inserted while being attached to the surface of the puncture needle, and the contact surface of the inner needle and the puncture needle is adjusted according to the inclination angle of the insertion block, so that the effect of stable needle guiding is achieved.

Description

Technical Field

[0001] This invention relates to the field of medical devices, specifically a cannula used in a model of middle cerebral artery occlusion. Background Technology

[0002] Middle cerebral artery occlusion is a classic animal model for studying ischemic stroke and is increasingly used in the study of cerebral ischemia mechanisms. Because most ischemic strokes occur in the area innervated by the middle cerebral artery, the middle cerebral artery is the focus of stroke mouse models. The intraluminal single-line model of occlusion of the middle cerebral artery is used to simulate persistent or transient occlusion and is widely used in mice to simulate persistent and transient local ischemic symptoms.

[0003] Current middle cerebral artery occlusion model experiments typically use a cannula. The cannula is inserted by puncturing the blood vessel wall, then the needle core is fully inserted, and the suture plug is slowly pushed in to enter the target blood vessel and block the blood flow to the corresponding brain tissue.

[0004] When using the aforementioned cannula, the puncture needle needs to be inserted into the blood vessel first, and then the needle core and the suture plug are inserted in sequence. However, after the puncture needle is inserted, the distance between the needle core and the puncture needle is small, the friction of inserting the needle core is large, the stability is poor, and the function of smooth needle insertion is lacking, which can easily cause problems with timely insertion. Therefore, we propose a cannula for use in the middle cerebral artery occlusion model. Summary of the Invention

[0005] The purpose of this invention is to provide a cannula for use in a middle cerebral artery occlusion model, in order to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A cannula for a middle cerebral artery occlusion model includes a puncture needle and a sleeve fixedly installed at one end of the puncture needle. The puncture needle contains an inner needle with a suture plug inside. One end of the suture plug has an embolus body, which blocks blood flow to the target vessel. A wing plate is fixedly connected to the outer side of the sleeve to facilitate puncture. An insert block is movably sleeved at the end of the inner needle away from the embolus body. An insert cylinder is located on the outer side of the insert block and fixed to one end of the sleeve. The insert block has a cylindrical annular structure, allowing the inner needle to be easily inserted into the puncture needle. The inner diameter of the insert cylinder is larger than the outer diameter of the insert block. The outer side of the insertion block has an arc-shaped structure, allowing it to rotate inside the insertion tube. The outer diameter of the inner needle is smaller than the inner diameter of the puncture needle, facilitating insertion of the inner needle into the puncture needle and providing space for adjusting the position of the inner needle. A top plate is fixedly installed on the top of the insertion block and fitted onto the outer side of the inner needle. A handle is fixedly connected to one end of the inner needle near the insertion block, allowing operation of the inner needle via the handle. The insertion tube contains a swinging mechanism for adjusting the swing of the inner needle. A heat-supporting mechanism is used to expand the thrombus body upon heating, thereby quickly blocking blood flow. The heat-supporting mechanism is installed at one end of the thrombus. The outer side of the sleeve also has a pressing mechanism for rapid hemostasis at the puncture point.

[0007] Preferably, the placement mechanism includes multiple ball bearings installed inside the insert cylinder. An annular groove is formed on the inner side of the insert cylinder to limit the sliding movement of the ball bearings. The ball bearings are movably embedded into the inner side of the insert cylinder through the annular groove. A circular ring is provided inside the annular groove, penetrating the surface of the ball bearings, so that multiple ball bearings are movably sleeved on the outer side of the circular ring. An arc-shaped groove is formed on the outer side of the insert block to limit the sliding movement of the ball bearings. After the insert block is inserted into the insert cylinder, the arc-shaped groove can abut against the outer side of the ball bearings. The outer diameter of the top plate is larger than that of the insert cylinder. The top outer diameter of the insert block is [not specified]. A guide plate is fixedly connected to the bottom of the insert block. An arc-shaped groove corresponding to the first arc-shaped groove is formed on the outer side of the guide plate. The outer side of the guide plate has a sloping structure. When the insert block is inserted into the insert cylinder, the arc-shaped groove on the guide plate can separate and slide multiple balls into the arc-shaped groove of the insert block, facilitating quick installation of the insert block. Several elastic strips are fixedly connected to the inner side of the insert cylinder in a ring and equidistantly distributed on the outer side of the inner needle, providing support for the bottom of the insert block. The elasticity of the elastic strips facilitates the insertion of the insert block. For angle adjustment, the end of the first elastic strip away from the insert cylinder contacts the bottom of the insert block. Several second elastic strips, arranged in a ring at equal intervals, are fixedly connected to the inner side of the insert cylinder. The end of each second elastic strip away from the insert cylinder contacts the top of the top plate. When the insert block is inserted, it abuts against the second elastic strip and the ball bearing, and the second elastic strip also holds the top of the insert block in place, preventing it from falling out of the insert cylinder during angle adjustment. Both the first and second elastic strips have folding grooves on their inner sides for easy folding. The insertion block is bent and inserted into the interior of the insert tube, where elastic strips one and two position the insertion block inside the insert tube. When the guide plate contacts the ball bearings, multiple ball bearings slide into the arc-shaped groove one on the outside of the insertion block. After the inner needle passes through the top plate and inserts into the puncture needle, the insertion block can be rotated along the outside of the ball bearings to adjust the angle of the insertion block, allowing the inner needle to be slowly inserted against the surface of the puncture needle, improving the stability of the inner needle insertion. The contact surface between the inner needle and the puncture needle is adjusted according to the tilt angle of the insertion block, achieving a stable needle guiding effect.

[0008] Preferably, the thermal support mechanism includes a controller fixedly installed at the end of the bolt away from the bolt body. A housing is fixedly connected to the outside of the controller, a heat insulation cylinder is fixedly connected to the bottom of the controller, and a heating cylinder is fixedly connected to the inside of the heat insulation cylinder. An electric heating coil is fixedly connected to the bottom of the controller, surrounding the outside of the heating cylinder. By energizing the electric heating coil through the controller, the heating cylinder can be heated. The bolt is located inside the heating cylinder, and the heating cylinder can heat the bolt. A heat-conducting ball is fixedly connected to the end of the bolt near the bolt body. The heat-conducting ball is made of a heat-expandable material. When the thrombus is heated, the heat-conducting ball expands. The heat-conducting ball is located inside the thrombus body. When the heat-conducting ball expands, it can press against the inside of the thrombus body, causing the thrombus body to expand and become larger. Several equally spaced heat-conducting rods are fixedly connected to the inside of the heating cylinder. The heat-conducting rods penetrate the surface of the thrombus body, improving the heating efficiency of the heating cylinder on the thrombus body. The controller can activate the heating coil to heat the heating cylinder. The thrombus body is rapidly heated by the heat-conducting rods, which can cause the heat-conducting ball to expand and the thrombus body to expand and become larger, making it easier to quickly block the target blood vessel.

[0009] Preferably, the pressing mechanism includes a mounting ring movably sleeved on the outside of the puncture needle. A hemostatic cotton is provided on the side of the mounting ring away from the wing plate, enabling rapid hemostasis at the puncture point. A cavity for installing the hemostatic cotton is formed on the surface of the mounting ring. A sliding ring is movably sleeved on the outside of the sleeve. Several equally spaced rubber rods are fixedly connected between the mounting ring and the sliding ring. Pushing the sliding ring pushes the mounting ring towards the puncture point. An opening of the same width as the wing plate is formed on the surface of the sliding ring. Several equally spaced triangular teeth are fixedly connected within the cavity of the mounting ring, facilitating rapid installation of the hemostatic cotton. When the puncture needle is inserted into the blood vessel from within the skin, pushing the sliding ring brings the mounting ring closer to the puncture point, and rotating the sliding ring brings it into contact with the outside of the wing plate. Utilizing the elasticity of the rubber rods, the hemostatic cotton can be pressed against the puncture point to stop bleeding.

[0010] Preferably, both the insert and the handle have anti-slip textures on their outer sides to facilitate operation.

[0011] Preferably, the slip ring has contact grooves on both sides for gripping the slip ring.

[0012] Preferably, a buffer ring is fixedly connected to the end of the heat insulation cylinder away from the controller, and the inner side of the buffer ring is movably sleeved on the outer side of the wire plug to improve the heating efficiency of the heating cylinder on the wire plug.

[0013] Preferably, the bottom of the controller is fixedly connected to a first insertion ring, and the surface of the handle is provided with a positioning groove for the first insertion ring to be inserted into, so as to facilitate the installation of the controller on the surface of the handle.

[0014] Preferably, the mounting ring is fixedly connected to a second insert ring on the side near the rubber rod, and the sleeve is provided with a storage groove at the end away from the insert ring for the second insert ring to be inserted, so as to facilitate the mounting ring being installed at one end of the sleeve.

[0015] Preferably, a positioning ring is fixedly connected to the outer side of the sleeve, and a retaining strip is fixedly connected to the side of the positioning ring near the wing plate. Both sides of the retaining strip are provided with retaining grooves for the sliding ring to be inserted into, so that the sliding ring can abut against the retaining groove of the retaining strip to position the sliding ring and facilitate storage.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention utilizes a placement mechanism where an insert block abuts against the second elastic strip and is inserted into the insert cylinder. This allows the first and second elastic strips to position the insert block inside the insert cylinder, facilitating rapid installation. When the guide plate contacts the ball bearings, multiple ball bearings slide separately into the arc-shaped groove on the outer side of the insert block. After the inner needle passes through the top plate and inserts into the puncture needle, the insert block can be rotated along the outer side of the ball bearings to adjust its angle. This allows the inner needle to be slowly inserted against the surface of the puncture needle, improving the stability of the needle insertion. Furthermore, the contact surface between the inner needle and the puncture needle is adjusted according to the tilt angle of the insert block, thereby achieving a stable needle guide effect.

[0017] 2. This invention uses a thermal support mechanism and an electric heating coil to heat the heating cylinder, and a heat-conducting rod to rapidly heat the thrombus. This allows the heat-conducting ball to expand and the thrombus to expand, thereby achieving the effect of rapidly blocking the target blood vessel.

[0018] 3. The present invention uses a pressing mechanism to push the slip ring so that the mounting ring comes into contact with the puncture point, and rotates the slip ring to contact the outer side of the wing plate. By utilizing the elasticity of the rubber rod, the hemostatic cotton can be pressed on the puncture point to stop bleeding, thereby achieving a convenient hemostasis effect. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the ring and ball structure in this invention; Figure 3 This is a schematic diagram of the elastic strip and the insert structure in this invention; Figure 4 This is a schematic diagram of the insert block and top plate structure in this invention; Figure 5 This is a schematic diagram of the structure of the heat insulation cylinder and the heating cylinder in this invention; Figure 6 This is a schematic diagram of the plug and heat-conducting ball structure in this invention; Figure 7This is a schematic diagram of the slip ring and rubber rod structure in this invention; Figure 8 This is a schematic diagram of the mounting ring and triangular retaining tooth structure in this invention.

[0020] In the diagram: 1. Puncture needle; 2. Sleeve; 3. Placement mechanism; 301. Ball bearing; 302. Ring; 303. Guide plate; 304. Elastic strip one; 305. Elastic strip two; 4. Thermal support mechanism; 401. Controller; 402. Outer shell; 403. Heat insulation cylinder; 404. Heating cylinder; 405. Heating coil; 406. Heat-conducting ball; 407. Heat-conducting rod; 5. Pressing mechanism; 501. Mounting ring; 502. Hemostatic cotton; 503. Slip ring; 504. Rubber rod; 505. Triangular retaining tooth; 6. Inner needle; 7. Thread plug; 8. Plug body; 9. Wing plate; 10. Insertion block; 11. Insertion cylinder; 12. Top plate; 13. Handle; 14. Insertion ring one; 15. Insertion ring two; 16. Positioning ring; 17. Retaining strip; 18. Buffer ring. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example 1

[0022] Please see Figures 1-4The illustration shows a cannula used in a middle cerebral artery occlusion model, comprising a puncture needle 1 and a sleeve 2 fixedly installed at one end of the puncture needle 1. The puncture needle 1 contains an inner needle 6, and inside the inner needle 6 is a suture plug 7. One end of the suture plug 7 is fitted with an embolus 8, which blocks blood flow to the target vessel. A wing plate 9 is fixedly connected to the outside of the sleeve 2 to facilitate puncture of the puncture needle 1. An insert block 10 is movably sleeved at the end of the inner needle 6 away from the embolus 8. An insert sleeve 11 is located on the outside of the insert block 10 and fixed to one end of the sleeve 2. The insert block 10 has a cylindrical annular structure, allowing the inner needle 6 to be easily inserted into the puncture needle 1. The inner diameter of the insert sleeve 11 is larger than the outer diameter of the insert block 10. The outer side of the insertion block 10 has an arc-shaped structure, allowing the insertion block 10 to rotate inside the insertion cylinder 11. The outer diameter of the inner needle 6 is smaller than the inner diameter of the puncture needle 1, which facilitates the insertion of the inner needle 6 into the puncture needle 1 and provides space for the position adjustment of the inner needle 6. A top plate 12 is fixedly installed on the top of the insertion block 10 and sleeved on the outer side of the inner needle 6. A handle 13 is fixedly connected to one end of the inner needle 6 near the insertion block 10, and the inner needle 6 is operated through the handle 13. The insertion cylinder 11 is equipped with a swinging mechanism 3 for the swing adjustment of the inner needle 6. A heat-supporting mechanism 4 is used to heat-expand the thrombus 8 for rapid blood flow blocking. The heat-supporting mechanism 4 is installed on one end of the suture thrombus 7. A pressing mechanism 5 for rapid hemostasis at the puncture point is also provided on the outer side of the sleeve 2.

[0023] Please see Figure 2 and Figure 3As shown in the figure, the placement mechanism 3 includes multiple balls 301 installed inside the insert 11. An annular groove is provided on the inner side of the insert 11 to limit the sliding movement of the balls 301. The balls 301 are movably embedded into the inner side of the insert 11 through the annular groove. A circular ring 302 is provided inside the annular groove, penetrating the surface of the balls 301, so that the multiple balls 301 are movably sleeved on the outer side of the circular ring 302. The outer side of the insert block 10 has a feature for limiting the sliding movement of the balls 301. The first arc-shaped groove allows the insert 10 to abut against the outer side of the ball bearings 301 after it is inserted into the insert cylinder 11. The outer diameter of the top plate 12 is larger than the top outer diameter of the insert 10. A guide plate 303 is fixedly connected to the bottom of the insert 10. An arc-shaped groove corresponding to the first arc-shaped groove is provided on the outer side of the guide plate 303. The outer side of the guide plate 303 has a sloping structure. When the insert 10 is inserted into the insert cylinder 11, the arc-shaped groove on the guide plate 303 can hold multiple ball bearings 301 against the outer side of the ball bearings 301. The insert 10 slides into the arc-shaped groove of the insert 10 to facilitate quick installation. Several elastic strips 304, arranged in a ring and equidistantly on the outer side of the inner pin 6, are fixedly connected to the inner side of the insert cylinder 11. These strips provide support for the bottom of the insert 10 and allow for angle adjustment of the insert 10 using the elasticity of the elastic strips 304. The end of the elastic strip 304 furthest from the insert cylinder 11 contacts the bottom of the insert 10. Several elastic strips 304 are fixedly connected to the inner side of the insert cylinder 11 in a ring and equidistantly distributed manner. The second elastic strip 305 has one end away from the insert 11 that contacts the top of the top plate 12. When the insert 10 is inserted, it can abut against the second elastic strip 305 and contact the ball 301. The second elastic strip 305 abuts against the top of the insert 10, so that the insert 10 will not fall out of the insert 11 when the angle is adjusted. The inner sides of the first elastic strip 304 and the second elastic strip 305 are provided with folding grooves to facilitate the folding and bending of the first elastic strip 304 and the second elastic strip 305. The user presses the top plate 12 to push the insert 10 to move, so that the insert 10 abuts against the second elastic strip 305 and is inserted into the inside of the insert tube 11. The first elastic strip 304 and the second elastic strip 305 position the insert 10 inside the insert tube 11. When the guide plate 303 contacts the ball bearing 301, the multiple balls bearing 301 are separated and slid into the arc-shaped groove on the outside of the insert 10. Then, the user holds the handle 13 and inserts the inner needle 6 into the puncture needle 1 through the top plate 12. The user then rotates the insert 10 along the outside of the ball bearing 301 to adjust the angle of the insert 10 so that the inner needle 6 can be inserted slowly downward into the blood vessel while adhering to the surface of the puncture needle 1, thereby improving the stability of the insertion of the inner needle 6. The user also adjusts the contact surface between the inner needle 6 and the puncture needle 1 according to the tilt angle of the insert 10, thereby achieving the effect of smooth needle guidance.

[0024] Please see Figure 5 and Figure 6In the diagram, the heat-supporting mechanism 4 includes a controller 401 fixedly installed at the end of the plug 7 away from the plug body 8. A housing 402 is fixedly connected to the outside of the controller 401, and a heat insulation cylinder 403 is fixedly connected to the bottom of the controller 401. A heating cylinder 404 is fixedly connected to the inside of the heat insulation cylinder 403. An electric heating coil 405, surrounding the outside of the heating cylinder 404, is fixedly connected to the bottom of the controller 401. By energizing the electric heating coil 405 through the controller 401, the heating cylinder 404 can be heated. The plug 7 is located inside the heating cylinder 404. The heating cylinder 404 can heat the plug 7. A heat-conducting ball 406 is fixedly connected to one end of the plug 7 near the plug body 8. The heat-conducting ball 406 is made of a material that can expand when heated. When the plug 7 is heated, the heat-conducting ball 406 expands. The heat-conducting ball 406 is located inside the plug body 8. When the heat-conducting ball 406 expands when heated, it can press against the inside of the plug body 8, causing the plug body 8 to expand and become larger. Several equally spaced heat-conducting rods 407 are fixedly connected to the inside of the heating cylinder 404. The heat-conducting rods 407 penetrate the surface of the plug 7, improving the heating efficiency of the heating cylinder 404 on the plug 7. After the user inserts the suture 7 into the target blood vessel, the controller 401 activates the heating coil 405, which heats the heating cylinder 404. The heating cylinder 404 rapidly heats the suture 7 through the heat-conducting rod 407, causing the heat-conducting ball 406 to expand and push the inside of the thrombus 8, thus expanding the thrombus 8 and achieving the effect of quickly blocking the target blood vessel.

[0025] Please see Figure 7 and Figure 8 As shown in the figure, the pressing mechanism 5 includes a mounting ring 501 that is movably sleeved on the outside of the puncture needle 1. The side of the mounting ring 501 away from the wing plate 9 is provided with hemostatic cotton 502, which can quickly stop bleeding at the puncture point of the puncture needle 1. The surface of the mounting ring 501 has a cavity for installing the hemostatic cotton 502. The outer side of the sleeve 2 is movably sleeved with a sliding ring 503. Several rubber rods 504 that are equidistantly distributed in a ring are fixedly connected between the mounting ring 501 and the sliding ring 503. Pushing the sliding ring 503 can push the mounting ring 501 toward the puncture point. The surface of the sliding ring 503 has an opening with the same width as the wing plate 9. Several triangular teeth 505 that are equidistantly distributed are fixedly connected in the cavity of the mounting ring 501, which facilitates the quick installation of the hemostatic cotton 502. The user inserts the puncture needle 1 into the blood vessel through the skin and pinches the slip ring 503 to push it along the outside of the sleeve 2 towards the puncture point. The rubber rod 504 pushes the mounting ring 501 to come into contact with the puncture point. When the slip ring 503 moves away from the wing plate 9, the user rotates the slip ring 503 to contact the side of the wing plate 9 closest to the mounting ring 501. Using the elasticity of the rubber rod 504, the hemostatic cotton 502 is pressed on the puncture point to stop bleeding, thereby achieving the effect of rapid hemostasis.

[0026] The working principle for facilitating the smooth insertion of the inner needle 6 into the blood vessel is as follows: First, the user holds the insert 11 and inserts the puncture needle 1 into the target blood vessel through the skin. The user then pinches the slip ring 503 and pushes it along the outside of the sleeve 2 towards the puncture point. The rubber rod 504 pushes the mounting ring 501 against the puncture point. When the slip ring 503 moves away from the wing plate 9, the user rotates the slip ring 503 until it contacts the side of the wing plate 9 closest to the mounting ring 501. The elasticity of the rubber rod 504 allows the hemostatic cotton 502 to press and stop the bleeding at the puncture point. Then, the user holds the handle 13 and inserts the inner needle 6 through the top plate 12 into the puncture needle 1, while the user presses against the insert block 10 and rotates it along the outside of the ball bearing 301. The angle of the insert block 10 is adjusted so that the inner needle 6 can be slowly inserted into the blood vessel while adhering to the surface of the puncture needle 1, improving the stability of the insertion of the inner needle 6. The contact surface between the inner needle 6 and the puncture needle 1 is adjusted according to the tilt angle of the insert block 10, thereby achieving a stable needle guide effect. Finally, the user inserts the suture 7 into the target blood vessel through the inner needle 6 and activates the controller 401, so that the heating coil 405 heats the heating cylinder 404. The heating cylinder 404 heats the suture 7 rapidly through the heat-conducting rod 407, causing the heat-conducting ball 406 to expand due to heat, pushing the inside of the thrombus 8 and expanding the thrombus 8, thereby achieving the effect of quickly blocking the target blood vessel. Example 2

[0027] Please see Figure 2 , Figure 5 and Figure 7 This embodiment further illustrates Example 1. In the figure, anti-slip textures are provided on the outer sides of the insert 11 and the handle 13 to facilitate operation of the insert 11 and the handle 13. Contact grooves are provided on both sides of the slip ring 503 for gripping the slip ring 503. A buffer ring 18 is fixedly connected to the end of the heat insulation cylinder 403 away from the controller 401. The inner side of the buffer ring 18 is movably sleeved on the outer side of the wire plug 7 to improve the heating efficiency of the heating cylinder 404 on the wire plug 7.

[0028] In this embodiment, the anti-slip texture on the surface of the insertion tube 11 and the handle 13 makes it easy for the user to grip and prevents slippage during puncture operations. After puncture, the user can pinch the two contact grooves with their fingers to push the slip ring 503 to move, improving the convenience of adjusting the slip ring 503. Example 3

[0029] Please refer to the diagram. Figures 4-7This embodiment further illustrates other embodiments. In the figure, the bottom of the controller 401 is fixedly connected to a first insertion ring 14. The surface of the handle 13 is provided with a positioning groove for the first insertion ring 14 to be inserted, so that the controller 401 can be installed on the surface of the handle 13. The side of the mounting ring 501 near the rubber rod 504 is fixedly connected to a second insertion ring 15. The end of the sleeve 2 away from the insertion cylinder 11 is provided with a storage groove for the second insertion ring 15 to be inserted, so that the mounting ring 501 can be installed on one end of the sleeve 2. The outer side of the sleeve 2 is fixedly connected to a positioning ring 16. The side of the positioning ring 16 near the wing plate 9 is fixedly connected to a retaining strip 17. Both sides of the retaining strip 17 are provided with retaining grooves for the sliding ring 503 to be inserted, so that the sliding ring 503 can abut against the retaining groove of the retaining strip 17 to position the sliding ring 503 and facilitate storage.

[0030] In this embodiment, the controller 401 can be fixed to the top of the handle 13 by means of the first insertion ring 14, and the second insertion ring 15 on the mounting ring 501 can be inserted into the storage groove at one end of the sleeve 2, which can quickly assemble the cannula needle for easy storage. The slip ring 503 can be locked in the slot of the locking strip 17 to prevent the slip ring 503 from falling off when the puncture needle 1 is puncturing.

[0031] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0032] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A cannula for use in a middle cerebral artery occlusion model, comprising a puncture needle (1) and a sleeve (2) fixedly installed at one end of the puncture needle (1), wherein the puncture needle (1) has an inner needle (6) inside, the inner needle (6) has a suture plug (7) inside, and one end of the suture plug (7) is fitted with a plug body (8), characterized in that: A wing plate (9) is fixedly connected to the outside of the sleeve (2). A plug block (10) is movably sleeved at the end of the inner needle (6) away from the plug body (8). A plug cylinder (11) is provided on the outside of the plug block (10). The plug cylinder (11) is fixed at one end of the sleeve (2). The plug block (10) has a cylindrical ring structure. The inner diameter of the plug cylinder (11) is larger than the outer diameter of the plug block (10). The outside of the plug block (10) has an arc surface structure. The outer diameter of the inner needle (6) is smaller than the inner diameter of the puncture needle (1). A top plate (12) is fixedly installed on the top of the plug block (10) and sleeved on the outside of the inner needle (6). A handle (13) is fixedly connected to the end of the inner needle (6) near the plug block (10). A swinging mechanism (3) for swinging adjustment of the inner needle (6) is installed inside the plug cylinder (11). The heat-supporting mechanism (4) is used to heat and expand the thrombus (8) to quickly block blood flow. The heat-supporting mechanism (4) is installed at one end of the thrombus (7). The sleeve (2) is also provided with a pressing mechanism (5) for quick hemostasis at the puncture point.

2. The cannula used in a middle cerebral artery occlusion model according to claim 1, characterized in that: The placement mechanism (3) includes multiple balls (301) installed inside the insert (11). An annular groove is provided on the inner side of the insert (11) for the balls (301) to slide and limit their movement. A circular ring (302) is provided inside the annular groove, penetrating the surface of the balls (301). An arc-shaped groove is provided on the outer side of the insert block (10) for the balls (301) to slide and limit their movement. The outer diameter of the top plate (12) is larger than the top outer diameter of the insert block (10). A guide plate (303) is fixedly connected to the bottom of the insert block (10). An arc-shaped groove corresponding to the arc-shaped groove is provided on the outer side of the guide plate (303). The corresponding arc-shaped groove 2, the outer side of the guide plate (303) is a sloping structure, the inner side of the insert (11) is fixedly connected with a number of elastic strips 1 (304) distributed in a ring at equal intervals on the outer side of the inner needle (6), the end of the elastic strip 1 (304) away from the insert (11) is in contact with the bottom of the insert block (10), the inner side of the insert (11) is fixedly connected with a number of elastic strips 2 (305) distributed in a ring at equal intervals, the end of the elastic strip 2 (305) away from the insert (11) is in contact with the top of the top plate (12), and the inner sides of the elastic strip 1 (304) and the elastic strip 2 (305) are both provided with folding grooves.

3. The cannula used in a middle cerebral artery occlusion model according to claim 1, characterized in that: The heat support mechanism (4) includes a controller (401) fixedly installed at the end of the wire plug (7) away from the plug body (8). A housing (402) is fixedly connected to the outside of the controller (401). A heat insulation cylinder (403) is fixedly connected to the bottom of the controller (401). A heating cylinder (404) is fixedly connected to the inside of the heat insulation cylinder (403). An electric heating wire is fixedly connected to the bottom of the controller (401) and extends around the outside of the heating cylinder (404). The loop (405) and the plug (7) are located inside the heating cylinder (404). A heat-conducting ball (406) is fixedly connected to one end of the plug (7) near the plug body (8). The heat-conducting ball (406) is made of a material that can expand when heated. The heat-conducting ball (406) is located inside the plug body (8). Several heat-conducting rods (407) are fixedly connected to the inside of the heating cylinder (404). The heat-conducting rods (407) penetrate the surface of the plug (7).

4. The cannula used in a middle cerebral artery occlusion model according to claim 1, characterized in that: The pressing mechanism (5) includes a mounting ring (501) that is movably sleeved on the outside of the puncture needle (1). The mounting ring (501) is provided with hemostatic cotton (502) on the side away from the wing plate (9). The surface of the mounting ring (501) is provided with a cavity for the hemostatic cotton (502) to be installed. A slip ring (503) is movably sleeved on the outside of the sleeve (2). A number of rubber rods (504) that are equidistantly distributed in a ring are fixedly connected between the mounting ring (501) and the slip ring (503). The surface of the slip ring (503) is provided with an opening of the same width as the wing plate (9). A number of triangular teeth (505) that are equidistantly distributed are fixedly connected in the cavity of the mounting ring (501).

5. The cannula for use in a middle cerebral artery occlusion model according to claim 1, characterized in that: Both the outer sides of the insert (11) and the handle (13) are provided with anti-slip texture.

6. The cannula for use in a middle cerebral artery occlusion model according to claim 4, characterized in that: The slip ring (503) has contact grooves on both sides.

7. The cannula for use in a middle cerebral artery occlusion model according to claim 3, characterized in that: A buffer ring (18) is fixedly connected to one end of the heat insulation cylinder (403) away from the controller (401), and the inner side of the buffer ring (18) is movably sleeved on the outer side of the bolt (7).

8. The cannula for use in a middle cerebral artery occlusion model according to claim 3, characterized in that: The bottom of the controller (401) is fixedly connected to a first insert ring (14), and the surface of the handle (13) is provided with a positioning groove for the first insert ring (14) to be inserted into the limit position.

9. A cannula for use in a middle cerebral artery occlusion model according to claim 4, characterized in that: The mounting ring (501) is fixedly connected to the side of the rubber rod (504) with a second insert ring (15), and the sleeve (2) is provided with a storage groove at the end away from the insert (11) for the second insert ring (15) to be inserted into the sleeve.

10. A cannula for use in a middle cerebral artery occlusion model according to claim 4, characterized in that: A positioning ring (16) is fixedly connected to the outer side of the sleeve (2). A retaining strip (17) is fixedly connected to the side of the positioning ring (16) near the wing plate (9). Both sides of the retaining strip (17) are provided with retaining grooves for the sliding ring (503) to be inserted into.

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