Tanshinone IIA injection device for animal experiments

Abstract

The invention discloses a tanshinone IIA injection device for animal experiments, which comprises a needle cylinder, the surface of which is marked with scale marks; the push rod is movably inserted into the needle cylinder; and a needle; the needle head is mounted at the bottom end of the needle cylinder; a tooth groove is formed in the position, deviating from the surface, with the scale marks, of the needle cylinder, of the push rod, a containing groove is formed in the inner wall of an opening of the needle cylinder, the containing groove is close to the tooth groove, and a clamping and stopping shifting piece is arranged in the containing groove. The clamping and stopping shifting piece can synchronously and transversely move along with downward pressing of the push rod, the push rod can be locked at a designated position in cooperation with the limiting piece, the dosage of the tanshinone IIA medicament injected each time can be adjusted according to injection requirements in injection experiments of batches of animals, continuous downward pressing is prevented after the designated dosage is reached, and the injection efficiency is improved. The dosage of the tanshinone IIA medicament injected into all tested animals is ensured to be consistent, the tanshinone IIA medicament does not need to be extracted for multiple times, the process of debugging the dosage each time is omitted, and the operation time is saved.

Description

Technical Field

[0001] The invention belongs to the technical field of medical devices, and in particular relates to a tanshinone IIA injection device for animal experiments. Background Art

[0002] Tanshinone IIA is orange-red needle-shaped crystals, mp 209~210 ℃. It is easily soluble in organic solvents such as ethanol, acetone, ether, benzene, and slightly soluble in water. It is mainly used to treat cardiovascular diseases. It has the functions of expanding blood vessels, lowering blood pressure, and anti-thrombotic. It has significant therapeutic effects on the treatment of coronary heart disease, angina pectoris, and tachycardia. In order to verify whether the specific characteristics of the drug cause damage to human functions, it is necessary to inject Tanshinone IIA into animals for experiments in the early stage.

[0003] In order to ensure the accuracy and safety of the experimental results, when injecting Tanshinone IIA into animals for experiments, it is necessary to comply with the "one needle, one injection" operating specification. In the injection experiment on batches of animals, it is necessary to frequently extract Tanshinone IIA and replace the injection device one by one. This injection process is too cumbersome and will result in low work efficiency. In addition, before each injection, the injection dosage needs to be repeatedly adjusted, which further delays the injection efficiency and also has a certain impact on the subsequent experimental process. Therefore, there are great limitations in practical applications and there is room for improvement. Summary of the invention

[0004] The purpose of the present invention is to provide a Tanshinone IIA injection device for animal experiments to solve the problems raised in the above background technology that the current injection devices have complicated operating steps, low work efficiency, and a certain impact on the progress of subsequent experiments in injection experiments on batches of animals.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a Tanshinone IIA injection device for animal experiments, comprising a syringe with scale marks on the surface; a push rod movably inserted into the interior of the syringe; and a needle; the needle is installed at the bottom end of the syringe; a tooth groove is provided on the surface of the push rod away from the syringe with scale marks, and a placement groove is provided on the inner wall of the syringe opening, the placement groove is arranged adjacent to the tooth groove, and a locking paddle is arranged in the placement groove, the top of which extends to the outside of the syringe and is bent into a hook shape to extend in the opposite direction to the top surface of the syringe, and the bottom of the locking paddle is inclined toward the direction of the push rod; a guide rod is fixed to the side wall of the placement groove, the guide rod and the locking paddle are movably penetrated, and a sleeve is provided on the guide rod for locking the locking paddle The invention relates to a spring for resisting the locking paddle; a tension spring is also fixed on the inner side surface of the locking paddle, and a clamping plate is fixed on the inner wall of the placement groove, and the tension spring is slidably inserted into the clamping plate; the retaining piece is arranged as a whole inside the syringe, and its top end passes through the placement groove, and is pressed or separated from the bottom area of ​​the locking paddle by lifting and lowering, and the bottom end of the retaining piece is between the syringe and the needle; it also includes a rotating member, which rotates around its own axis, and the rotating member is meshed and connected with the tooth groove, and is resisted by the rotation of the locking paddle; a surface groove is opened on the top end of the syringe, and a guide member is arranged in the surface groove, and a limiting member is arranged on the guide member, the top end of the locking paddle is bent and extends into the surface groove, and the top of the locking paddle is guided and slid by the guide member, and the locking paddle resists the limiting member.

[0006] As a preferred technical solution in the present invention, the rotating member includes a rotating shaft, and two groups of paddles are fixed on the outer surface of the rotating shaft at 180° symmetry, and the paddles are meshingly connected with the tooth grooves. When the push rod moves downward, it will drive the paddles to rotate, and at this time, the paddles will synchronously drive the rotating shaft to rotate. A paddle rod is also fixed to the end of the rotating shaft, and the paddle rod is eccentrically arranged with the rotating shaft. When the rotating shaft rotates, it will drive the paddle rod to rotate, and the paddle rod will abut against the bottom area of ​​the locking paddle.

[0007] As a preferred technical solution in the present invention, an annular groove is opened in the middle of the rotating shaft; an axle seat is fixed at the bottom end of the placement groove, and the top of the axle seat is movably sleeved in the annular groove of the rotating shaft, thereby realizing the installation of the rotating shaft, and the rotating shaft can rotate in the axle seat.

[0008] As a preferred technical solution in the present invention, the guide member includes multiple groups of guide parts one and two arranged in a partition state, and baffles connecting the partition areas of guide parts one and two, wherein the guide parts one, two and baffles are all inclined, and the slopes of the three are equal; the guide parts one and two are arranged in a centrally symmetrical shape, and one end of the guide part two is glued to the outside of the guide part one, and the other end is overlapped on the guide part two, and a guide plate is arranged on the inner side from the second guide part two in the initial position to the last guide part two, the guide plate is made of plastic material, and the top end thereof is inclined and extends toward the spacing between the guide parts one and two, so as to guide when the locking paddle moves in the later stage, and the thickness of the locking paddle is equal to the spacing between the guide parts one and two.

[0009] As a preferred technical solution in the present invention, a spacing is left between the end of the guide plate and the side wall of the face groove, and the spacing is greater than or equal to the width of the locking paddle, ensuring that the locking paddle returns to the initial position through this spacing, and the bottom of the guide plate extends obliquely toward the guide member at the initial position, and the spacing between the two is less than the thickness of the locking paddle, so when the locking paddle pushes away the guide plate, it will move to the outside of the guide plate and will not return to its original position.

[0010] As a preferred technical solution in the present invention, the limiting member includes a limiting frame symmetrically fixed on both sides of the face groove opening, a limiting plate passing through the face groove is arranged inside the limiting frame, elastic sheets are fixed at both ends of the limiting plate, and the elastic sheets are against the inner wall of the limiting frame. Before injection, the limiting plate is moved to adjust where the locking paddle will be blocked by the limiting plate when it moves to. When the locking paddle is blocked by the limiting plate, it means that the dose of a single injection has been reached, and the elastic sheet is always against the inner wall of the limiting frame, so it can be limited when the limiting plate moves to any position.

[0011] As a preferred technical solution in the present invention, one of the limit frames is provided with a scale mark, which is not shown in the figure, and the dose of each injection can be accurately controlled by the scale mark.

[0012] As a preferred technical solution in the present invention, the bottom end of the push piece is annular and is sleeved on the bottom end of the syringe. An arc groove is opened on the annular surface of the push piece, and a top block is fixed to the top of the needle, which is adapted to the arc groove. Each time the needle is installed, the needle is first inserted in the state shown in the figure. At this time, the top block will lift the bottom of the push piece, so that the top of the push piece will lift the bottom of the locking paddle, thereby moving the top of the locking paddle away from the push rod, thereby restoring the initial position with the help of the spring. When the top block contacts the bottom of the syringe, the needle is rotated so that the top block is aligned with the arc groove. Finally, the push piece descends under the action of gravity and is sleeved on the top block, which is the state shown in the figure.

[0013] As a preferred technical solution in the present invention, an identification protrusion is fixed on the surface of the needle, and the identification protrusion is in the same direction as the top block. During insertion, the insertion angle and direction can be determined with the help of the identification protrusion.

[0014] As a preferred technical solution in the present invention, the length of the shifting rod and the guide rod is equal to the width of the top of the stopper.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The locking paddle in the present invention can move laterally synchronously with the downward pressure of the push rod, and cooperate with the limiter to lock the push rod at a specified position. In the injection experiment of batch animals, the dose of each injection of Tanshinone IIA agent can be adjusted according to the injection requirements, and the push rod can be prevented from continuing to be pressed down after reaching the specified dose, so as to ensure that the dose of Tanshinone IIA agent injected by all the tested animals is consistent, and there is no need to extract Tanshinone IIA agent multiple times, and the process of each dose adjustment is omitted, thereby saving operation time; 2. In the present invention, the end of the abutment sheet contacts the needle, and the top contacts the locking paddle. Each time the needle is replaced, the locking paddle can be restored to its initial position and the restriction on the push rod can be released to achieve continuous and quantitative output of Tanshinone IIA agent. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the overall structure of the Tanshinone IIA injection device for animal experiments; Figure 2 This is a schematic diagram of the structure of the Tanshinone IIA injection device for animal experiments without the syringe; Figure 3 for Figure 2 A magnified schematic diagram of the middle A area; Figure 4 It is an enlarged schematic diagram of the top area of ​​the syringe; Figure 5 for Figure 4 A magnified schematic diagram of the middle B area; Figure 6 is a schematic diagram of the structure of the guide member in a top view; Figure 7 for Figure 4 Enlarged schematic diagram of the middle C area; Figure 8 It is a schematic diagram of the connection state of the locking paddle, the guide rod and the tension spring; Fig. 9 This is a schematic diagram of the state after the needle and the abutment are connected; Fig.10 It is a schematic diagram of the state where the needle and the abutment piece are in tight contact; Fig.11It is a connection diagram of the limiting plate and the limiting frame.

[0017] In the figure: 100, syringe; 100a, placement slot; 100b, face slot; 101, push rod; 101a, tooth groove; 102, needle; 102a, identification protrusion; 102b, top block; 103, shaft seat; 104, limit frame; 105, clamping plate; 106, limit plate; 107, elastic sheet; 108, piston; 200, locking paddle; 201, tension spring; 202, guide rod; 203, spring; 300, abutment piece; 300a, arc groove; 400, rotating member; 401, rotating shaft; 402, lever; 403, lever plate; 500, guide member; 501, guide portion 1; 502, guide portion 2; 503, baffle; 504, guide plate. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] See also Figures 1 to 11 The present invention provides a technical solution: a Tanshinone IIA injection device for animal experiments, comprising The syringe 100 has scale markings on its surface; A push rod 101 is movably inserted into the interior of the syringe 100; and The needle 102 is mounted at the bottom end of the syringe 100; The push rod 101 is provided with a tooth groove 101a on the surface of the syringe 100 with the scale mark, and a placement groove 100a is provided on the inner wall of the opening of the syringe 100. The placement groove 100a is arranged adjacent to the tooth groove 101a, and the placement groove 100a is arranged: The top of the latching paddle 200 extends to the outside of the syringe 100, and is bent into a hook shape to extend in the opposite direction to the top surface of the syringe 100, while the bottom of the latching paddle 200 is inclined toward the push rod 101; a guide rod 202 is fixed to the side wall of the placement groove 100a, and the guide rod 202 is movably penetrated by the latching paddle 200, and a spring 203 that resists the latching paddle 200 is also sleeved on the guide rod 202; a tension spring 201 is also fixed to the inner side of the latching paddle 200, wherein when the tension spring 201 is in a state of not generating tension, the latching paddle 200 The top end of the locking paddle 200 is in a state of being limited by the guide member 500, and when the locking paddle 200 is lifted up by the abutment 300 and the top end of the locking paddle 200 is brought close to the inner wall of the guide member 500, the tension spring 201 still does not generate an elastic force exceeding the rebound force of the guide rod 202, ensuring that the guide rod 202 can normally push the locking paddle 200 back to the initial position, wherein the locking paddle 200 and the tension spring 201 can be fixed by spot welding, and a clamping plate 105 is fixed to the inner wall of the placement groove 100a, and the tension spring 201 is slidably clamped into the clamping plate 105; The push piece 300 is integrally disposed inside the syringe 100, with its top end penetrating into the placement groove 100a, and is pressed against or separated from the bottom area of ​​the locking paddle 200 by lifting and lowering, and the bottom end of the push piece 300 is located between the syringe 100 and the needle 102; It also includes a rotating member 400, which rotates around its own axis, and the rotating member 400 is meshed and connected with the tooth groove 101a, and rotates against the locking paddle 200; A surface groove 100b is provided on the top of the syringe 100, and a guide member 500 is provided in the surface groove 100b. A limiting member is provided on the guide member 500. The top of the locking paddle 200 is bent and extends into the surface groove 100b, and the top of the locking paddle 200 is guided and slid by the guide member 500, and the locking paddle 200 is against the limiting member. During injection, the push rod 101 is pressed downward, which will drive the rotating member 400 to rotate, and then the rotating member 400 will drive the locking paddle 200 to rotate around the guide rod 202, so that the top of the locking paddle 200 is close to the push rod 101. At this time, the locking paddle 200 is compressed in the guide member 500. The locking paddle 200 moves in the direction of the spring 203 until it is blocked by the limit piece. At this time, the stopper 300 is raised and the bottom area of ​​the locking paddle 200 is squeezed by the stopper 300. At this time, the top end of the locking paddle 200 changes from moving in the direction close to the push rod 101 to moving in the direction away from the push rod 101 until it moves to the inner wall of the surface groove 100b. At this time, the locking paddle 200 is no longer blocked by the guide member 500, and the spring 203 rebounds, pushing the locking paddle 200 horizontally along the guide rod 202 until it is pushed to the end side wall of the surface groove 100b, that is, the initial position, and completing the preparation for the next quantitative injection.

[0020] In this embodiment, the rotating member 400 includes a rotating shaft 401, and two sets of dial plates 403 are fixed on the outer surface of the rotating shaft 401 at 180° symmetry. The dial plates 403 are meshed and connected with the tooth grooves 101a. When the push rod 101 moves downward, the dial plates 403 are driven to rotate. At this time, the dial plates 403 will synchronously drive the rotating shaft 401 to rotate. A lever 402 is also fixed to the end of the rotating shaft 401. The lever 402 is eccentrically arranged with the rotating shaft 401. When the rotating shaft 401 rotates, the lever 402 is driven to rotate, and the lever 402 is against the bottom area of ​​the locking paddle 200. Since the lever 402 is eccentrically arranged at the end of the rotating shaft 401, it will be against the locking paddle 200 once every time the rotating shaft 401 rotates one circle. At the same time, the tooth grooves 101a The locking paddle 200 will also move downward. When the locking paddle 200 is pressed by the lever 402, the locking paddle 200 will rotate around the guide rod 202 and generate a pulling force on the tension spring 201, so that the top of the locking paddle 200 moves along the guide member 500 toward the push rod 101. At the same time, as the locking paddle 200 rotates, the lever 402 will pass through the locking paddle 200 for the next tightening with the locking paddle 200. When the lever 402 is separated from the locking paddle 200, the tension spring 201 rebounds the locking paddle 200 in the direction away from the push rod 101 through rebound. During the rebound process, the guide member 500 is used to achieve lateral dislocation movement. At this time, the entire locking paddle 200 moves laterally on the guide rod 202 and simultaneously squeezes the spring 203.

[0021] In this embodiment, an annular groove is opened in the middle of the rotating shaft 401; an axle seat 103 is fixed at the bottom end of the placement groove 100a, and the top of the axle seat 103 is movably sleeved in the annular groove of the rotating shaft 401, so as to realize the installation of the rotating shaft 401, and the rotating shaft 401 can rotate in the axle seat 103.

[0022] In this embodiment, the guide member 500 includes a plurality of guide portions 1 501 and 2 502 arranged in a partitioned state, and a baffle 503 connecting the partitioned areas of the guide portions 1 501 and 2 502. The guide portions 1 501, 2 502, and baffle 503 are all inclined, and the slopes of the three are equal, so as to ensure that the latching paddle 200 can be tilted and moved in a direction away from the push rod 101 under rebound, and move from the inside of the guide member 500 to the outside to achieve dislocation lateral movement; the guide portions 1 501 and 2 502 are arranged in a centrally symmetrical shape, and one end of the guide portion 2 502 is connected to the guide portion 1 501. 01 is glued on the outside, and the other end is overlapped on the guide part 2 502. A guide plate 504 is provided on the inner side of the second guide part 2 502 in the initial position to the last guide part 2 502. The guide plate 504 is made of plastic material, and its top end is inclined and extended toward the spacing between the guide part 1 501 and the guide part 2 502, so as to guide the locking paddle 200 when it moves in the later stage. The thickness of the locking paddle 200 is equal to the spacing between the guide part 1 501 and the guide part 2 502. When the locking paddle 200 is squeezed by the lever 402, the locking paddle 200 will pass through the guide part 1 501 and the guide part 2 502. When the latching paddle 200 passes through the guide part 1 501 and the guide part 2 502, the baffle 503 returns to its original position due to the deformation and rebound of its own material, and closes the gap. When the latching paddle 200 is rebounded by the tension spring 201, it slides downward along the inclined area of ​​the guide part 1 501, passes through the baffle 503 and the guide part 2 502, and moves toward the guide plate 504. Under the action of the elastic force, the guide plate 504 is pushed open, and then passes through the gap between the guide plate 504 and the guide part 2 502, and falls into the guide plate 504 and the guide part 2 502 at the adjacent position. When the lever 402 presses against the locking paddle 200 next time, the locking paddle 200 will continue to pass through the gap between the guide part 1 501 and the guide part 2 502 along the guide plate 504, and at the same time push the blocking piece 503 open, thereby realizing the lateral movement of the locking paddle 200. At the same time, the length of the lateral movement of the locking paddle 200 is proportional to the length of the push rod 101 when it is pressed down. Therefore, by controlling the lateral movement distance of the locking paddle 200, the injection dose of the push rod 101 can be controlled. A piston 108 is installed at the bottom end of the push rod 101, and the tanshinone IIA agent is pushed into the needle 102 through the piston 108.

[0023] In this embodiment, a spacing is left between the end of the guide plate 504 and the side wall of the groove 100b, and the spacing is greater than or equal to the width of the locking paddle 200, so that the locking paddle 200 can be restored to the initial position through this spacing. The bottom of the guide plate 504 extends obliquely toward the guide member 500 at the initial position, and the spacing between the two is less than the thickness of the locking paddle 200. Therefore, when the locking paddle 200 pushes away the guide plate 504, it will move to the outside of the guide plate 504 and will not return to its original position.

[0024] In this embodiment, the limiting member includes a limiting frame 104 symmetrically fixed on both sides of the opening of the surface groove 100b, and a limiting plate 106 passing through the surface groove 100b is arranged inside the limiting frame 104. Elastic sheets 107 are fixed at both ends of the limiting plate 106, and the elastic sheet 107 is against the inner wall of the limiting frame 104. Before injection, the limiting plate 106 is moved to adjust the position where the locking paddle 200 will be blocked by the limiting plate 106 when it moves. When the locking paddle 200 is blocked by the limiting plate 106, it means that the dose of a single injection has been reached, and the elastic sheet 107 is always against the inner wall of the limiting frame 104, so it can be limited when the limiting plate 106 moves to any position.

[0025] In this embodiment, a scale mark is set on one of the limit frames 104, which is not drawn in the figure. The scale mark can accurately control the dosage of each injection. The limit plate 106 contacts or separates from the guide member 500 to avoid collision and cause motion interference.

[0026] In this embodiment, the bottom end of the push piece 300 is annular and sleeved on the bottom end of the syringe 100. The annular surface of the push piece 300 is provided with an arc groove 300a, and the top of the needle 102 is fixed with a top block 102b, which is adapted to the arc groove 300a. When the needle 102 is installed each time, the needle 102 is first installed with Fig.10 , at which time the top block 102b will lift the bottom of the retaining piece 300, so that the top of the retaining piece 300 will lift the bottom of the locking paddle 200, thereby moving the top of the locking paddle 200 away from the push rod 101, thereby restoring the initial position with the help of the spring 203, and when the top block 102b contacts the bottom of the syringe 100, the needle 102 is rotated again to align the top block 102b with the arc groove 300a, and finally the retaining piece 300 descends under the action of gravity and is sleeved on the top block 102b, that is, Fig. 9 The status shown in .

[0027] In this embodiment, a marking protrusion 102a is fixed on the surface of the needle 102. The marking protrusion 102a and the top block 102b are in the same direction. When inserting, the angle and direction of insertion can be determined with the help of the marking protrusion 102a.

[0028] In this embodiment, the lengths of the lever 402 and the guide rod 202 are equal to the width of the top of the retaining piece 300 , ensuring that the locking lever 200 at any position on the guide rod 202 can be resisted by the lever 402 and lifted by the retaining piece 300 .

[0029] Although embodiments of the present invention have been shown and described (see the above detailed description for details), it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A Tanshinone IIA injection device for animal experiments, comprising A syringe (100) having a scale mark on its surface; A push rod (101) is movably inserted into the interior of the syringe (100); and A needle (102); the needle (102) is mounted at the bottom end of the syringe (100); Features: The push rod (101) is provided with a tooth groove (101a) on the surface of the syringe (100) with scale marks away from the push rod (101), and a placement groove (100a) is provided on the inner wall of the opening of the syringe (100). The placement groove (100a) is arranged adjacent to the tooth groove (101a), and the placement groove (100a) is provided with: The top of the locking paddle (200) extends to the outside of the syringe (100), and is bent to form a hook shape and extends in the opposite direction to the top surface of the syringe (100), while the bottom of the locking paddle (200) is inclined toward the direction of the push rod (101); a guide rod (202) is fixed on the side wall of the placement groove (100a), and the guide rod (202) and the locking paddle (200) are movably connected, and the guide rod (202) is also sleeved with a spring (203) that resists the locking paddle (200); a tension spring (201) is also fixed on the inner side surface of the locking paddle (200), and a clamping plate (105) is fixed on the inner wall of the placement groove (100a), and the tension spring (201) is slidably clamped into the clamping plate (105); The abutment piece (300) is integrally arranged inside the syringe (100), the top end of which penetrates into the placement groove (100a), and is pressed against or separated from the bottom area of ​​the locking paddle (200) by lifting and lowering, and the bottom end of the abutment piece (300) is located between the syringe (100) and the needle (102); It also includes a rotating member (400) that rotates around its own axis, the rotating member (400) is meshedly connected with the tooth groove (101a) and rotates against the locking paddle (200); A surface groove (100b) is provided on the top end of the syringe (100), a guide member (500) is provided in the surface groove (100b), a limiting member is provided on the guide member (500), the top end of the locking paddle (200) is bent and extends into the surface groove (100b), and the top of the locking paddle (200) is guided and slid by the guide member (500), and the locking paddle (200) abuts against the limiting member.

2. The Tanshinone IIA injection device for animal experiments according to claim 1, characterized in that: The rotating member (400) comprises a rotating shaft (401), and two groups of shifting plates (403) are fixed on the outer surface of the rotating shaft (401) at a 180° symmetry, and the shifting plates (403) are meshedly connected with the tooth grooves (101a). A shifting rod (402) is also fixed at the end of the rotating shaft (401), and the shifting rod (402) is eccentrically arranged with respect to the rotating shaft (401), and the shifting rod (402) abuts against the bottom area of ​​the locking shifting plate (200).

3. The Tanshinone IIA injection device for animal experiments according to claim 2, characterized in that: An annular groove is provided in the middle of the rotating shaft (401); an axle seat (103) is fixed at the bottom end of the placement groove (100a), and the top of the axle seat (103) is movably sleeved in the annular groove of the rotating shaft (401).

4. The Tanshinone IIA injection device for animal experiments according to claim 1, characterized in that: The guide member (500) comprises a plurality of guide portions 1 (501) and 2 (502) arranged in a partitioned state, and a baffle (503) connecting the partitioned areas of the guide portions 1 (501) and 2 (502); the guide portions 1 (501), 2 (502) and the baffle (503) are all inclined, and the slopes of the three are equal; the guide portions 1 (501) and 2 (502) are arranged in a centrally symmetrical shape, and one end of the guide portion 2 (502) is connected to the guide portion 1 (501). The outer side of the guide part (501) is glued, and the other end is overlapped on the guide part (502). A guide plate (504) is arranged on the inner side from the second guide part (502) in the initial position to the inner side of the last guide part (502). The guide plate (504) is made of plastic material, and its top end is inclined and extends toward the spacing between the guide part (501) and the guide part (502). The thickness of the locking paddle (200) is equal to the spacing between the guide part (501) and the guide part (502).

5. The Tanshinone IIA injection device for animal experiments according to claim 4, characterized in that: A spacing is left between the end of the guide plate (504) and the side wall of the surface groove (100b), the spacing being greater than or equal to the width of the locking paddle (200); the bottom of the guide plate (504) extends obliquely toward the guide member (500) at the initial position, and the spacing between the two is less than the thickness of the locking paddle (200).

6. The Tanshinone IIA injection device for animal experiments according to claim 4, characterized in that: The limiting member comprises a limiting frame (104) symmetrically fixed on both sides of the opening of the surface groove (100b); a limiting plate (106) passing through the surface groove (100b) is arranged inside the limiting frame (104); elastic sheets (107) are fixed at both ends of the limiting plate (106); and the elastic sheets (107) abut against the inner wall of the limiting frame (104).

7. The Tanshinone IIA injection device for animal experiments according to claim 6, characterized in that: One of the limit frames (104) is provided with a scale mark.

8. The Tanshinone IIA injection device for animal experiments according to claim 1, characterized in that: The bottom end of the abutment (300) is annular and sleeved on the bottom end of the syringe (100). An arc groove (300a) is provided on the annular surface of the abutment (300), and a top block (102b) is fixed to the top end of the needle (102), and the top block (102b) is adapted to the arc groove (300a).

9. The Tanshinone IIA injection device for animal experiments according to claim 8, characterized in that: A marking protrusion (102a) is also fixed on the surface of the needle head (102), and the marking protrusion (102a) and the top block (102b) are in the same direction.

10. The Tanshinone IIA injection device for animal experiments according to claim 1, characterized in that: The lengths of the shifting rod (402) and the guide rod (202) are equal to the width of the top of the stopper (300).

Images