Veterinary multi-tube injector

Abstract

The invention belongs to the technical field of injectors, and particularly relates to a multi-tube injector for veterinary use, which comprises an injection cylinder assembly, a liquid pressing assembly and an injection needle assembly, the injection cylinder assembly is used for mixing a plurality of liquid medicines in proportion in the injection process, the liquid pressing assembly is used for storing the mixed liquid medicines injected by the injection cylinder assembly and automatically discharging the medicines at regular time, and the injection needle assembly is used for injecting the mixed liquid medicines into the injection cylinder assembly. The injection needle assembly is used for injecting the mixed liquid medicine discharged by the liquid pressing assembly into the animal body at regular time and automatically separating the mixed liquid medicine from the animal body. The injection needle assembly can complete regular injection and needle withdrawal of animals under the condition that the animal activity space does not need to be limited, the injection needle assembly can move along with the animals in the injection process, and compared with the mode that the animals are limited in a narrow space to be injected, the injection needle assembly is more convenient to use. The injection needle assembly can efficiently inject a large number of animals.

Description

Technical Field

[0001] The present invention belongs to the technical field of syringes, and in particular relates to a veterinary multi-tube syringe. Background Art

[0002] Veterinary syringes are commonly used in many industries such as animal husbandry, epidemic prevention, textile, chemical industry, and food, and are mostly used as continuous injection tools. The following problems still exist in the specific use process: 1. When injecting the needle, there is often relatively strong pain, and the animal will involuntarily dodge and move around, affecting the injection. In order to ensure that the injection is not affected by the animal's movement, the animal to be injected is generally locked in a small space with limited movement to prevent the animal from making large movements during the injection. However, when the number of animals to be injected is large, the injection efficiency of this method of using a small space to limit the movement range of the animal is low.

[0003] 2. General syringes are single-tube syringes. If simultaneous injection of multiple drugs is required, multiple drugs to be injected need to be mixed in a container and injected at one time using a single-tube syringe. However, the mixing of drugs increases the injection time and the injection efficiency is low. With the development of syringe technology, single-tube syringes have evolved into double-tube syringes, which can inject two drugs simultaneously to achieve efficient injection. However, syringes with more tubes do not exist in the market due to fewer application scenarios and there is no need for research and development. Using a double-tube syringe to inject more than two drugs also has the problem of low injection efficiency.

[0004] 3. For multi-tube syringes, the injection volume of a single drug cannot be adjusted separately according to specific actual needs, which is inconvenient to use.

[0005] 4. Whether it is a single-tube syringe or a multi-tube syringe, during the injection process, a certain injection speed is required, and the injection speed cannot be too fast. Currently, the injection speed of the syringe is controlled manually, and the injection speed cannot be accurately controlled.

[0006] The present invention designs a veterinary multi-tube syringe to solve the above problems. Summary of the Invention

[0007] Based on this, it is necessary to provide a veterinary multi-tube syringe for the problems existing in the current syringes. The injection needle assembly in the present invention can complete timed injection and needle withdrawal for animals without restricting the animal's activity space. During the injection process, the injection needle assembly can move with the animal. Compared with injecting the animal by restricting it to a narrow space, the injection needle assembly can efficiently inject a larger number of animals. The injection cylinder assembly in the present invention can achieve the proportional mixing and final quantitative injection of two to four drugs during simultaneous injection through cooperation with a single-tube container assembly or a double-tube container assembly, effectively improving the efficiency of simultaneous injection of multiple drugs. The two injection cartridges of the injection cylinder assembly in the present invention can separately adjust the amount of liquid medicine entering them, and the double-tube container assembly installed on the first mounting seat of each injection cartridge can select two second containers with corresponding radius ratios according to the ratio of the two liquid medicines required, so as to achieve proportional quantitative mixing of multiple drugs during injection. The injection needle assembly in the present invention completes injection at a fixed time under the combined action of the sixth spring, the seventh spring and the damping structure formed by the damping cylinder, and the injection speed is automatically controlled within a constant speed range without manual control of the injection speed. The liquid pressing assembly in the present invention can automatically complete the injection of the quantitatively mixed liquid medicine into the animal body through the injection needle assembly after the injection cylinder assembly injects the quantitatively mixed liquid medicine into the elastic capsule, ensuring that the injection needle assembly can still normally complete drug injection after being separated from the injection cylinder assembly due to the large movement of the animal.

[0008] The above object is achieved by the following technical solutions: A veterinary multi-tube syringe for proportionally and quantitatively injecting multiple liquid medicines into animals, comprising: An injection cylinder assembly for proportionally mixing multiple liquid medicines during injection.

[0009] A liquid pressing assembly for storing the mixed liquid medicine ejected by the injection cylinder assembly and automatically discharging the medicine at a fixed time.

[0010] An injection needle assembly for injecting the mixed liquid medicine discharged by the liquid pressing assembly into the animal body at a fixed time and automatically detaching.

[0011] In one embodiment, the injection needle assembly includes a circular plate. Three third guide rods are slidably arranged in three first chutes evenly distributed circumferentially on the circular plate. One end of each of the three third guide rods is provided with a first ring plate, and the other end of each third guide rod is provided with a second limit block to prevent it from detaching from the first chute. A fourth ring sleeve is arranged inside the first ring plate. A cylindrical liquid shell is slidably arranged in the fourth ring sleeve. One end of the liquid shell is provided with a first injection nozzle for installing a needle. The other end of the liquid shell is fixedly connected to the circular plate through a push rod. A second liquid inlet pipe is arranged on the side wall of the liquid shell, and the second liquid inlet pipe moves in a second chute on the fourth ring sleeve. A damping cylinder is slidably arranged on the push rod. A third piston is arranged on the push rod, and the third piston is hermetically slidable inside the damping cylinder. Three liquid through holes evenly distributed circumferentially and penetrating through both ends are opened on the third piston. Three lock assemblies corresponding to the third guide rods one by one and cooperating with the lock grooves on the corresponding third guide rods are arranged on the circular plate. Three second trigger rods corresponding to the lock assemblies one by one and cooperating therewith are arranged on the end face of the damping cylinder. The second trigger rods are slidably arranged in the jacks on the circular plate. A circular ring is arranged outside the damping cylinder. Three third chutes are circumferentially opened on the cylindrical surface of the circular ring. A first inner rod cooperating with a first limit block inside one end of the fourth ring sleeve is slidably arranged in the third chute. A connecting rod is arranged on the first inner rod. A first inclined surface is arranged on the first limit block. A fourth spring for moving the corresponding first inner rod outwards is arranged in the third ring groove. Three first trigger rods evenly distributed circumferentially are axially slidable inside a fourth guide sleeve outside the damping cylinder. A fifth spring for resetting the first trigger rod is arranged inside the fourth guide sleeve. One end of the first trigger rod cooperates with the circular plate, and the other end of the first trigger rod cooperates with an inclined rod on the corresponding connecting rod. A sixth spring is connected between the first ring plate and the circular plate. A seventh spring is connected between a second ring plate outside the damping cylinder and the circular plate. A positioning sleeve for positioning the sixth spring is arranged on the circular plate. A handle sleeve is arranged on the edge of the circular plate. Anti-slip lines are opened on the outer cylindrical surface of the handle sleeve. An abutting ring cooperating with the animal body surface is arranged at the end of the fourth ring sleeve.

[0012] In one embodiment, the lock assembly includes a rod sleeve which slides radially along the circular plate in a third guide sleeve on the circular plate. A second inner rod cooperating with the lock groove on the corresponding third guide rod is slidably arranged inside the rod sleeve. A second inclined surface is arranged on the inner wall of the lock groove. An eighth spring for moving the second inner rod towards the third guide rod is arranged inside the rod sleeve. A third inclined surface cooperating with the corresponding second trigger rod is opened at the end of the rod sleeve. Two tension spring plates are symmetrically arranged on the rod sleeve, and the tension spring plates are connected to the end face of the third guide sleeve through a ninth spring.

[0013] In one embodiment, the syringe assembly includes two injection cartridges fixedly connected together. The end of the injection cartridge is provided with a first injection nozzle and a liquid suction tube. A first one-way valve assembly is provided on the liquid suction tube. The end of the liquid suction tube is provided with a first mounting seat for mounting a single-tube container assembly or a double-tube container assembly. A first plug that communicates with the liquid suction tube and cooperates with the single-tube container assembly or the double-tube container assembly is provided in the middle of the first mounting seat. A first piston is slidably arranged in the injection cartridge. The end of the first piston is provided with a first push rod. The first push rod is slidably arranged in a circular groove at the end of the second push rod. A first spring that causes the first push rod and the second push rod to contract to the limit is provided in the circular groove. One end of the first spring is connected to a first spring pressing ring on the first push rod, and the other end of the first spring is connected to the inner wall of the circular groove. A first ring sleeve axially slides in the injection cartridge. A scale indicating the amount of medicine in the injection cartridge is provided on the first ring sleeve. A transparent window is provided on the wall surface of the injection cartridge. A scale line indicating the scale on the first ring sleeve is provided in the middle of the transparent window. A second ring sleeve that is threadedly connected to the first ring sleeve is rotatably arranged in the injection cartridge. A rotating sleeve connected to the second ring sleeve is provided outside the injection cartridge. Anti-slip lines are provided on the outer cylindrical surface of the rotating sleeve. The end of the second push rod is hinged with a connecting rod. The end of the connecting rod is hinged with a first handle. The first handle is hinged with a second handle provided on the injection cartridge. A scroll spring is connected between the first handle and the second handle.

[0014] In one embodiment, the single-tube container assembly consists of a first container and a first sealing film at the mouth of the first container. The first container is in threaded fit with the corresponding first mounting seat and cooperates with a first sealing gasket provided in the first mounting seat.

[0015] In one embodiment, the double-tube container assembly includes a U-shaped tube. Second mounting seats are provided at both ends of the U-shaped tube. A second plug that communicates with the U-shaped tube is provided in the middle of the second mounting seat. A reduced-diameter tube communicating with the U-shaped tube and a third ring sleeve threadedly connected to the corresponding first mounting seat are provided in the middle of the U-shaped tube. Second sealing gaskets and first sealing gaskets are respectively provided between the reduced-diameter tube and the third ring sleeve and the corresponding first mounting seats. A second container is threadedly mounted in the second mounting seat. A third sealing gasket is provided between the second container and the second mounting seat. A second sealing film is provided at the mouth of the second container. Two second pistons synchronously connected by a U-shaped rod are slidably arranged in the two second containers corresponding to the U-shaped tube.

[0016] In one embodiment, the first one-way valve assembly includes a first housing disposed on the liquid suction pipe. A first guide sleeve is provided in the first housing through a first fixing rod. A first guide rod is slidably disposed in the first guide sleeve. A first valve plug for opening and closing the liquid suction pipe is provided at the end of the first guide rod. A second spring is connected between the first valve plug and the first guide sleeve.

[0017] In one embodiment, the liquid pressing assembly includes an elastic bladder. The two ends of the elastic bladder are respectively provided with a first liquid inlet pipe and a liquid outlet pipe. The first liquid inlet pipe is connected to the first injection nozzles of two injection cartridges through a Y-shaped first hose. The first hose is inserted and matched with the first injection nozzle and is threadedly connected to the first liquid inlet pipe. The liquid outlet pipe is connected to a second liquid inlet pipe through a second hose. The two ends of the second hose are respectively threadedly connected to the liquid outlet pipe and the second liquid inlet pipe. A second one-way valve assembly is provided on the first liquid inlet pipe, and a third one-way valve assembly is provided on the liquid outlet pipe.

[0018] In one embodiment, the structure of the second one-way valve assembly is the same as that of the third one-way valve assembly. The second one-way valve assembly includes a second housing. The second housing is disposed on the first liquid inlet pipe or the liquid outlet pipe. A second guide sleeve is provided in the second housing through a second fixing rod. A second guide rod is slidably disposed in the second guide sleeve. A second valve plug for opening and closing the first liquid inlet pipe or the liquid outlet pipe is provided at the end of the second guide rod. A third spring is connected between the second valve plug and the second guide sleeve.

[0019] In one embodiment, two limiting rods for limiting the opening amplitude of the corresponding second valve plug are provided in the second housing of the third one-way valve assembly.

[0020] The injection cartridge and the corresponding first ring sleeve are in a guide block and guide groove fit.

[0021] The beneficial effects of the present invention are as follows: 1. The injection needle assembly in the present invention can complete timed injection and needle extraction of animals without restricting the activity space of the animals. The injection needle assembly can move with the animals during the injection process. Compared with injecting animals by restricting them in a narrow space, the injection needle assembly can efficiently inject a larger number of animals.

[0022] 2. The injection cylinder assembly in the present invention can, through cooperation with the single-tube container assembly or the double-tube container assembly, realize the proportional mixing of two to four drugs during simultaneous injection and finally complete quantitative injection, effectively improving the efficiency of simultaneous injection of multiple drugs.

[0023] 3. In the present invention, the two injection cartridges of the syringe assembly can separately adjust the amount of liquid medicine entering them, and the double-tube container assembly installed on the first mounting seat of each injection cartridge can select two second containers with corresponding radius ratios according to the ratio of the two liquid medicines required, so as to achieve proportional quantitative mixing of multiple drugs during injection.

[0024] 4. In the present invention, the injection needle assembly completes injection regularly under the combined action of the sixth spring, the seventh spring and the damping structure formed by the damping cylinder, and the injection speed is automatically controlled within a constant speed range without the need for manual control of the injection speed.

[0025] 5. In the present invention, the liquid pressing assembly can automatically complete the injection of the quantitatively mixed liquid medicine into the animal body through the injection needle assembly after the syringe assembly quickly completes the injection of the quantitatively mixed liquid medicine into its elastic capsule, ensuring that the injection needle assembly can still normally complete the drug injection even after it is separated from the syringe assembly due to the large movement of the animal. Description of the Drawings

[0026] Figure 1 is the overall schematic diagram of the present invention in cooperation with two single-tube container assemblies; Figure 2 is the overall schematic diagram of the present invention in cooperation with two double-tube container assemblies; Figure 3 is the schematic diagram of the syringe assembly; Figure 4 is the cross-sectional view of the internal structure of the injection cartridge; Figure 5 is the cross-sectional view of the mating structure of the injection cartridge and the first ring sleeve; Figure 6 is the cross-sectional view of the first one-way valve assembly; Figure 7 is the cross-sectional view of the connection and cooperation between the first handle and the second handle; Figure 8 is the single-tube container assembly and its cross-sectional view; Figure 9 is the structure where the second mounting seat is located in the double-tube container assembly and its cross-sectional view; Figure 10 is the second container in the double-tube container assembly and its cross-sectional view; Figure 11 is the cross-sectional view of the mating of the double-tube container assembly and the first mounting seat; Figure 12 is the cross-sectional view of the mating of the single-tube container assembly and the first mounting seat; Figure 13 is the two states of the liquid pressing assembly and its cross-sectional view; Figure 14 is the cross-sectional view of the third one-way valve assembly; Figure 15 It is a sectional view of the second one-way valve assembly; Figure 16 It is a schematic diagram of the injection needle assembly; Figure 17 It is a sectional view of the injection needle assembly; Figure 18 It is a sectional view of the cooperation between the first trigger rod and the inclined rod on the first inner rod; Figure 19 It is a sectional view of the cooperation between the lock assembly and the locking groove on the third guide rod; Figure 20 It is a sectional view of the structure of the lock assembly; Figure 21 It is the connection structure between the circular plate, the ejector rod and the liquid shell and its sectional view; Figure 22 It is the structure on the fourth ring sleeve and its sectional view; Figure 23 It is the structure on the damping cylinder and its sectional view; Names of the reference numerals in the figure: 100. Syringe assembly; 101. Injection cartridge; 102. Transparent window; 103. First injection nozzle; 104. Suction tube; 105. First mounting seat; 106. First sealing gasket; 107. First plug; 108. First piston; 109. First push rod; 110. First compression spring ring; 111. First spring; 112. Second push rod; 113. First ring sleeve; 114. Guide groove; 115. Guide block; 116. Second ring sleeve; 117. Swivel sleeve; 118. Link; 119. First handle; 120. Second handle; 121. Volute spring; 200. First one-way valve assembly; 201. First housing; 202. First fixing rod; 203. First guide sleeve; 204. First guide rod; 205. First valve plug; 206. Second spring; 300. Single-tube container assembly; 301. First container; 302. First sealing film; 400. Double-tube container assembly; 401. Third ring sleeve; 402. U-shaped tube; 403. Reducing pipe; 404. Second mounting seat; 405. Third sealing gasket; 406. Second plug; 407. Second container; 408. Second sealing film; 409. U-shaped rod; 410. Second piston; 411. Second sealing gasket; 500. Liquid pressing assembly; 501. Elastic capsule; 502. First liquid inlet pipe; 503. Liquid outlet pipe; 504. Second one-way valve assembly; 505. Third one-way valve assembly; 506. Second housing; 507. Second fixing rod; 508. Second guide sleeve; 509. Second guide rod; 510. Second valve plug; 511. Third spring; 512. Limit rod; 513. First hose; 514. Second hose; 600, injection needle assembly; 601, circular plate; 602, first chute; 603, jack; 604, third guide sleeve; 605, handle sleeve; 606, positioning sleeve; 607, ejector rod; 608, liquid shell; 609, second injection nozzle; 610, second liquid inlet pipe; 611, fourth ring sleeve; 612, second chute; 613, pressing ring; 614, first limiting block; 615, first inclined surface; 616, first ring plate; 617, third guide rod; 618, locking groove; 619, second inclined surface; 620, second limiting block; 621, damping cylinder; 622, fourth guide sleeve; 623, circular ring; 624, third chute; 625, first inner rod; 626, connecting rod; 627, inclined rod; 628, fourth spring; 629, first trigger rod; 630, fifth spring; 631, third piston; 632, liquid through hole; 633, second ring plate; 634, second trigger rod; 635, sixth spring; 636, seventh spring; 637, locking assembly; 638, rod sleeve; 639, third inclined surface; 640, eighth spring; 641, second inner rod; 642, tension spring plate; 643, ninth spring; 644, needle tip. Detailed implementation manners

[0027] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0028] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meanings. The "connection" and "coupling" mentioned in this application, unless otherwise specified, both include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0029] In the present invention, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may mean that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the horizontal height of the first feature is less than that of the second feature.

[0030] As Figures 1 - 23 shown, a multi-tube syringe for animals is used for proportionally and quantitatively injecting multiple kinds of liquid medicines into animals, and includes: An injection cylinder assembly 100 is used for proportionally mixing multiple kinds of liquid medicines during the injection process.

[0031] A liquid pressing assembly 500 is used for storing the mixed liquid medicine ejected by the injection cylinder assembly 100 and discharging the medicine regularly by itself.

[0032] An injection needle assembly 600 is used for regularly injecting the mixed liquid medicine discharged by the liquid pressing assembly 500 into an animal's body and automatically detaching.

[0033] In a further embodiment, as Figure 16 , Figure 17 , Figure 18 , Figure 19 , Figure 20 , Figure 21 , Figure 22 , Figure 23As shown, the injection needle assembly 600 includes a circular plate 601. Third guide rods 617 are slidably arranged in three first sliding grooves 602 evenly distributed circumferentially on the circular plate 601. One ends of the three third guide rods 617 are provided with a first ring plate 616, and the other ends of the third guide rods 617 are provided with second limit blocks 620 to prevent them from detaching from the first sliding grooves 602. A fourth ring sleeve 611 is arranged inside the first ring plate 616. A cylindrical liquid shell 608 is slidably arranged in the fourth ring sleeve 611. One end of the liquid shell 608 is provided with a first injection nozzle 103 for installing a needle 644. The other end of the liquid shell 608 is fixedly connected to the circular plate 601 through a push rod 607. A second liquid inlet pipe 610 is arranged on the side wall of the liquid shell 608, and the second liquid inlet pipe 610 moves in a second sliding groove 612 on the fourth ring sleeve 611. A damping cylinder 621 is slidably arranged on the push rod 607. A third piston 631 is arranged on the push rod 607, and the third piston 631 is hermetically slidable inside the damping cylinder 621. Three liquid through holes 632 evenly distributed circumferentially and penetrating through both ends are opened on the third piston 631. Three locking assemblies 637 corresponding to the third guide rods 617 one by one and cooperating with the locking grooves 618 on the corresponding third guide rods 617 are arranged on the circular plate 601. Three second trigger rods 634 corresponding to the locking assemblies 637 one by one and cooperating therewith are arranged on the end face of the damping cylinder 621. The second trigger rods 634 slide in jacks 603 on the circular plate 601. A circular ring 623 is arranged outside the damping cylinder 621. Three third sliding grooves 624 are circumferentially opened on the cylindrical surface of the circular ring 623. First inner rods 625 cooperating with first limit blocks 614 inside one end of the fourth ring sleeve 611 are slidably arranged in the third sliding grooves 624. Connecting rods 626 are arranged on the first inner rods 625. First inclined surfaces 615 are arranged on the first limit blocks 614. A fourth spring 628 for moving the corresponding first inner rods 625 outwards is arranged in the third ring groove. Three first trigger rods 629 evenly distributed circumferentially slide axially in a fourth guide sleeve 622 outside the damping cylinder 621. A fifth spring 630 for resetting the first trigger rods 629 is arranged inside the fourth guide sleeve 622. One end of the first trigger rod 629 cooperates with the circular plate 601, and the other end of the first trigger rod 629 cooperates with an inclined rod 627 on the corresponding connecting rod 626. A sixth spring 635 is connected between the first ring plate 616 and the circular plate 601. A seventh spring 636 is connected between a second ring plate 633 outside the damping cylinder 621 and the circular plate 601. A positioning sleeve 606 for positioning the sixth spring 635 is arranged on the circular plate 601. A handle sleeve 605 is arranged on the edge of the circular plate 601, and anti-slip patterns are opened on the outer cylindrical surface of the handle sleeve 605. A pressing ring 613 cooperating with the animal body surface is arranged at the end of the fourth ring sleeve 611.

[0034] In a further embodiment, as Figure 20As shown, the lock assembly 637 includes a rod sleeve 638 which slides radially along the circular plate 601 within a third guide sleeve 604 on the circular plate 601. A second inner rod 641 which mates with a locking groove 618 on a corresponding third guide rod 617 is slidably disposed within the rod sleeve 638. A second inclined surface 619 is provided on the inner wall of the locking groove 618. An eighth spring 640 is disposed within the rod sleeve 638 to move the second inner rod 641 towards the third guide rod 617. A third inclined surface 639 which mates with a corresponding second trigger rod 634 is provided at the end of the rod sleeve 638. Two tension spring plates 642 are symmetrically disposed on the rod sleeve 638, and the tension spring plates 642 are connected to the end face of the third guide sleeve 604 by ninth springs 643.

[0035] In a further embodiment, as Figure 3 , Figure 4 , Figure 5 , Figure 7 shown, the syringe barrel assembly 100 includes two syringe barrels 101 fixedly connected together. A first injection nozzle 103 and a liquid suction tube 104 are provided at the end of the syringe barrel 101. A first one-way valve assembly 200 is provided on the liquid suction tube 104. A first mounting seat 105 for mounting a single-tube container assembly 300 or a double-tube container assembly 400 is provided at the end of the liquid suction tube 104. A first plug 107 which communicates with the liquid suction tube 104 and mates with the single-tube container assembly 300 or the double-tube container assembly 400 is provided in the middle of the first mounting seat 105. A first piston 108 is slidably disposed within the syringe barrel 101. A first push rod 109 is provided at the end of the first piston 108. The first push rod 109 is slidably disposed within a circular groove at the end of a second push rod 112. A first spring 111 which contracts the first push rod 109 and the second push rod 112 to the limit is provided within the circular groove. One end of the first spring 111 is connected to a first compression spring ring 110 on the first push rod 109, and the other end of the first spring 111 is connected to the inner wall of the circular groove. A first ring sleeve 113 axially slides within the syringe barrel 101. A scale indicating the amount of medicine within the syringe barrel 101 is provided on the first ring sleeve 113. A transparent window 102 is provided on the wall surface of the syringe barrel 101. A marking line indicating the scale on the first ring sleeve 113 is provided in the middle of the transparent window 102. A second ring sleeve 116 which is threadedly connected to the first ring sleeve 113 is rotatably disposed within the syringe barrel 101. A rotating sleeve 117 connected to the second ring sleeve 116 is provided outside the syringe barrel 101. Anti-slip lines are provided on the outer cylindrical surface of the rotating sleeve 117. A connecting rod 118 is hinged to the end of the second push rod 112. A first handle 119 is hinged to the end of the connecting rod 118. The first handle is hinged to a second handle 120 provided on the syringe barrel 101. A torsion spring 121 is connected between the first handle and the second handle 120.

[0036] In a further embodiment, as Figure 8 、 Figure 12 shown, the single-tube container assembly 300 is composed of a first container 301 and a first sealing film 302 at the mouth of the first container 301. The first container 301 is in threaded fit with the corresponding first mounting seat 105, and the first container 301 cooperates with a first gasket 106 provided in the first mounting seat 105.

[0037] In a further embodiment, as Figure 9 、 Figure 10 、 Figure 11 shown, the double-tube container assembly 400 includes a U-shaped tube 402. Second mounting seats 404 are provided at both ends of the U-shaped tube 402. A second plug 406 communicating with the U-shaped tube 402 is provided in the middle of the second mounting seat 404. A reduced-diameter tube 403 communicating with the U-shaped tube 402 and a third ring sleeve 401 threadedly connected to the corresponding first mounting seat 105 are provided in the middle of the U-shaped tube 402. Second gaskets 411 and first gaskets 106 are respectively provided between the reduced-diameter tube 403 and the third ring sleeve 401 and the corresponding first mounting seats 105. A second container 407 is threadedly installed in the second mounting seat 404. A third gasket 405 is provided between the second container 407 and the second mounting seat 404. A second sealing film 408 is provided at the mouth of the second container 407. Two second pistons 410 synchronously connected by a U-shaped rod 409 are slidably arranged in two second containers 407 corresponding to the U-shaped tube 402.

[0038] In a further embodiment, as Figure 6 shown, the first one-way valve assembly 200 includes a first housing 201 provided on the liquid suction tube 104. A first guide sleeve 203 is provided in the first housing 201 through a first fixing rod 202. A first guide rod 204 is slidably arranged in the first guide sleeve 203. A first valve plug 205 for opening and closing the liquid suction tube 104 is provided at the end of the first guide rod 204. A second spring 206 is connected between the first valve plug 205 and the first guide sleeve 203.

[0039] In a further embodiment, as Figure 1 、 Figure 2 、 Figure 13As shown, the liquid pressing assembly 500 includes an elastic bladder 501. First liquid inlet pipes 502 and a liquid outlet pipe 503 are respectively arranged at two ends of the elastic bladder 501. The first liquid inlet pipe 502 is connected to first injection nozzles 103 of two injection cartridges 101 through a Y-shaped first flexible hose 513. The first flexible hose 513 is in plug-in fit with the first injection nozzle 103 and is threadedly connected to the first liquid inlet pipe 502. The liquid outlet pipe 503 is connected to a second liquid inlet pipe 610 through a second flexible hose 514. Two ends of the second flexible hose 514 are respectively threadedly connected to the liquid outlet pipe 503 and the second liquid inlet pipe 610. A second one-way valve assembly 504 is arranged on the first liquid inlet pipe 502, and a third one-way valve assembly 505 is arranged on the liquid outlet pipe 503.

[0040] In a further embodiment, as Figure 13 , Figure 15 shown, the structure of the second one-way valve assembly 504 is the same as that of the third one-way valve assembly 505. The second one-way valve assembly 504 includes a second housing 506. The second housing 506 is arranged on the first liquid inlet pipe 502 or the liquid outlet pipe 503. A second guide sleeve 508 is arranged in the second housing 506 through a second fixing rod 507. A second guide rod 509 is slidably arranged in the second guide sleeve 508. A second valve plug 510 for opening and closing the first liquid inlet pipe 502 or the liquid outlet pipe 503 is arranged at the end of the second guide rod 509. A third spring 511 is connected between the second valve plug 510 and the second guide sleeve 508.

[0041] In a further embodiment, as Figure 13 , Figure 14 shown, two limiting rods 512 for limiting the opening amplitude of the corresponding second valve plug 510 are arranged in the second housing 506 of the third one-way valve assembly 505.

[0042] A guide block 115 and a guide groove 114 are in fit between the injection cartridge 101 and the corresponding first ring sleeve 113.

[0043] The syringe assembly 600 in the present invention can complete timed injection and needle withdrawal of animals without restricting the activity space of the animals. During the injection process, the syringe assembly 600 can move with the animals. Compared with injecting animals by restricting them in a narrow space, the syringe assembly 600 can efficiently inject a larger number of animals. The syringe barrel assembly 100 in the present invention can, through cooperation with the single-tube container assembly 300 or the double-tube container assembly 400, achieve the proportional mixing of two to four drugs during simultaneous injection and finally complete quantitative injection, effectively improving the efficiency of simultaneous injection of multiple drugs. The two syringe barrels 101 of the syringe barrel assembly 100 in the present invention can separately adjust the amount of liquid medicine entering them, and the double-tube container assembly 400 installed on the first mounting seat 105 of each syringe barrel 101 can select two second containers 407 with corresponding radius ratios according to the ratio of the two liquid medicines required, so as to achieve proportional quantitative mixing of multiple drugs during injection. The syringe assembly 600 in the present invention completes injection at a fixed time under the combined action of the sixth spring 635, the seventh spring 636 and the damping structure formed by the damping cylinder 621, and the injection speed is automatically controlled within a constant speed range without manual control of the injection speed. The liquid pressing assembly 500 in the present invention can automatically complete the injection of the quantitatively mixed liquid medicine into the animal body through the syringe assembly 600 after the syringe barrel assembly 100 has injected the quantitatively mixed liquid medicine into the elastic bladder 501, ensuring that the syringe assembly 600 can still normally complete drug injection even after being separated from the syringe barrel assembly 100 due to large movements of the animal.

[0044] The operation process of the present invention is as follows: In the initial state, the distance limit between the two first pistons 108 in the syringe assembly 100 and the first injection nozzle 103 end of the corresponding injection cartridge 101 is at its maximum. The first piston 108 abuts against the end of the first collar 113, the spiral spring 121 is in a compressed state, the first handle 119 and the second handle 120 are opened to the maximum under the action of the spiral spring 121, the first spring 111 is in a compressed state, the first push rod 109 and the second push rod 112 are in a slightly stretched state, and the first one-way valve assembly 200 is in a closed state. The elastic bladder 501 in the liquid pressing assembly 500 is in an extreme contraction state, the second one-way valve assembly 504 and the third one-way valve assembly 505 are in a closed state, there is a certain distance between the second valve plug 510 and the limiting rod 512 in the third one-way valve assembly 505, the first liquid inlet pipe 502 is threadedly connected to the first hose 513, and the first hose 513 is not inserted onto the first injection nozzle 103 of the injection cartridge 101. The liquid outlet pipe 503 is connected to the second liquid inlet pipe 610 in the injection needle assembly 600 through the second hose 514. The needle 644 in the injection needle assembly 600 is in an extreme contraction state in the fourth collar 611, the tip part of the needle 644 is exposed, the sixth spring 635 and the seventh spring 636 are in a compressed state, the distance between the fourth collar 611 and the circular plate 601 is at its maximum, the first inner rod 625 abuts against the corresponding first limiting block 614 under the action of the corresponding fourth spring 628, the first trigger rod 629 abuts against the corresponding inclined rod 627 under the action of the corresponding fifth spring 630, and the second inner rod 641 and the corresponding rod sleeve 638 in the lock assembly 637 are in an extreme elongation state under the action of the corresponding eighth spring 640.

[0045] When it is necessary to use the present invention to perform proportional quantitative injection of two drugs on an animal, first adjust the position of the first collar 113 in the injection cartridge 101 that limits the movement amplitude of the first piston 108. Rotate the rotating sleeve 117, the rotating sleeve 117 drives the second collar 116 to rotate, the second collar 116 drives the first collar 113 to axially move a certain amplitude in the injection cartridge 101, the first collar 113 drives the first piston 108 to move a corresponding amplitude, so that the distance between the two first pistons 108 and the first injection nozzle 103 end of the corresponding injection cartridge 101 matches the ratio of the two drugs to be injected. The first piston 108 drives the corresponding first push rod 109 to elongate a certain amplitude relative to the corresponding second push rod 112 and further compresses the corresponding first spring 111. The scale line on the transparent window 102 of the injection cartridge 101 indicates the corresponding scale on the first collar 113.

[0046] Then, hold the first handle 119 and the second handle 120 with hands, so that the first handle 119 swings relative to the second handle 120 under the action of an external force and further compresses the scroll spring 121. The first handle 119 drives the first pistons 108 in the two syringe barrels 101 to move to the first injection nozzle 103 end of the syringe barrel 101 through the first push rod 109, the second push rod 112 and the connecting rod 118 in the syringe barrel 101, and discharges the air in the syringe barrel 101. Then, install the single-tube container assemblies 300 on the two first mounting seats 105 respectively. After the single-tube container assemblies 300 are installed, the mouth of the first container 301 of the single-tube container assembly 300 is squeezed with the first gasket 106 in the corresponding first mounting seat 105 to form a seal. The first plug 107 in the first mounting seat 105 pierces the first sealing film 302 at the mouth of the first container 301 and enters the liquid medicine in the first container 301. Then, make the first handle 119 reset relative to the second handle 120 under the action of the scroll spring 121. The first handle 119 drives the first piston 108 to perform a reset movement through a series of transmissions and finally makes the first piston 108 abut against the first collar 113. The two first pistons 108 create a negative pressure in the syringe barrel 101 and make the liquid medicine in the two single-tube container assemblies 300 enter the syringe barrel 101 in proportion through the first one-way valve assembly 200.

[0047] Next, insert the first injection nozzle 103 of the syringe barrel 101 into the first hose 513. Then, hold the grip 605 in the injection needle assembly 600 with hands and insert the needle 644 into the animal body. The abutting ring 613 abuts against the animal body surface. The grip 605 drives the needle 644 to move relative to the fourth collar 611 through the circular plate 601, the ejector rod 607 and the liquid shell 608 and quickly inserts it into the animal body. The ejector rod 607 drives the third piston 631 to move in the damper cylinder 621. The damping oil in the damper cylinder 621 enters the space at the other end of the third piston 631 through the liquid passage hole 632 on the third piston 631. The sixth spring 635 and the seventh spring 636 are further compressed. The second trigger rod 634 on the damper cylinder 621 drives the rod sleeve 638 to move towards the third guide rod 617 through the third inclined surface 639 at the rod sleeve 638 end of the lock assembly 637. The rod sleeve 638 drives the second inner rod 641 to abut against the third guide rod 617 through the eighth spring 640, and the ninth spring 643 is stretched.

[0048] When the locking groove 618 on the third guide rod 617 faces the second inner rod 641, the second inner rod 641 instantaneously inserts into the locking groove 618 under the action of the eighth spring 640 and prevents the reset movement of the circular plate 601 relative to the fourth ring sleeve 611. At this time, the first trigger rod 629 on the outer side of the damping cylinder 621 just abuts against the circular plate 601. As the circular plate 601 continues to move relative to the fourth ring sleeve 611, the second inner rod 641 in the lock assembly 637 moves out of the locking groove 618 along the second inclined surface 619 of the inner wall of the corresponding locking groove 618. The first trigger rod 629 moves a certain amplitude relative to the damping cylinder 621 under the action of the circular plate 601 and further compresses the fifth spring 630. The first trigger rod 629 drives the corresponding first inner rod 625 to contract into the corresponding third sliding groove 624 through the corresponding inclined rod 627 and the connecting rod 626 and further compresses the fourth spring 628. The contraction of the first inner rod 625 releases the restriction of the first limiting block 614 on the damping cylinder 621. The damping cylinder 621 moves into the fourth ring sleeve 611 under the action of the seventh spring 636. The damping oil on the side of the second trigger rod 634 in the damping cylinder 621 moves to the other end through the liquid passage hole 632, so that the movement of the damping cylinder 621 into the fourth ring sleeve 611 is slow, ensuring that the needle 644 inserted into the body has enough time to inject the liquid medicine into the body.

[0049] During the process of the damping cylinder 621 moving into the fourth ring sleeve 611, hold the first handle 119 and the second handle 120 with hands, so that the first handle 119 drives the second push rod 112 to move into the injection cartridge 101 through the connecting rod 118. When the second push rod 112 contracts to the shortest relative to the first push rod 109, the first piston 108 is driven by the first push rod 109 to mix the medicines in the two injection cartridges 101 in proportion and quickly press them into the elastic bladder 501 through the first hose 513 and the first liquid inlet pipe 502.

[0050] During the process of the liquid medicine in the single-tube container assembly 300 entering the injection cartridge 101 through the first one-way valve assembly 200, the first valve plug 205 of the first one-way valve assembly 200 opens and further compresses the second spring 206. During the process of the injection cylinder assembly 100 pressing the liquid medicine into the elastic bladder 501 of the liquid pressing assembly 500, the second valve plug 510 in the second one-way valve assembly 504 opens and further compresses the corresponding third spring 511. The second valve plug 510 in the third one-way valve assembly 505 opens under the pressure and action of the medicine in the elastic bladder 501 and further compresses the corresponding third spring 511. Since the opening amplitude of the second valve plug 510 in the third one-way valve assembly 505 is limited by the limiting rod 512, the elastic bladder 501 is quickly filled with the liquid medicine while the liquid medicine is slowly injected into the liquid shell 608 through the third one-way valve assembly 505. The liquid medicine entering the liquid shell 608 is injected into the body through the needle 644.

[0051] When the animal moves around due to feeling pain, the syringe assembly 100 has already injected all the two kinds of liquid medicines mixed in proportion into the elastic bladder 501. The animal will drive the first hose 513 to separate from the injection cartridge 101 through the injection needle assembly 600 and the liquid pressing assembly 500. After the liquid pressing assembly 500 separates from the syringe assembly 100, the elastic bladder 501 in the liquid pressing assembly 500 still injects the liquid medicine into the animal's body through the needle 644 without affecting the animal's movement.

[0052] When the damping cylinder 621 completes the reset relative to the circular plate 601, the liquid medicine in the elastic bladder 501 has been completely injected into the animal's body. At this time, the second trigger lever 634 releases the trigger on the locking assembly 637. The locking assembly 637 disengages from the locking groove 618 of the third guide rod 617 under the action of the eighth spring 640 and the ninth spring 643. The circular plate 601 resets relative to the fourth collar 611 under the action of the sixth spring 635. The circular plate 601 drives the liquid shell 608 to reset relative to the fourth collar 611 through the ejector rod 607. The needle 644 contracts towards the fourth collar 611 and is gradually withdrawn from the body. The ejector rod 607 drives the third piston 631 to reset in the damping cylinder 621. The liquid medicine at the end of the second trigger lever 634 in the damping cylinder 621 enters the space at the other end through the liquid passage hole 632 on the third piston 631.

[0053] During the reset process of the circular plate 601 relative to the fourth collar 611, when the first trigger lever 629 disengages from the circular plate 601, the first trigger lever 629 resets relative to the damping cylinder 621 under the action of the fifth spring 630. The first inner rod 625 resets under the action of the fourth spring 628. When the first inner rod 625 passes through the first inclined surface 615 on the limit block, it contracts into the third sliding groove 624 and does not prevent the damping cylinder 621 from moving out of the fourth collar 611. After the damping cylinder 621 resets relative to the fourth collar 611, the first inner rod 625 resets under the action of the fourth spring 628.

[0054] When the needle 644 resets relative to the fourth collar 611 and the part inserted into the animal's body is less, the injection needle assembly 600 can easily separate from the animal's body surface and fall off by itself during the animal's movement.

[0055] When three or four drugs need to be injected, the double-tube container assembly 400 needs to be installed on one first mounting seat 105 or two first mounting seats 105 of the syringe barrel assembly 100. The third collar 401 of the double-tube container assembly 400 is threadedly connected to the first mounting seat 105. The third collar 401 and the first gasket 106 in the first mounting seat 105 are squeezed to form a seal. The second gasket 411 at the end of the reducer tube 403 is squeezed and sealed with the first mounting seat 105. The first plug 107 in the first mounting seat 105 is inserted into the reducer tube 403. The second mounting seat 404 is internally threaded to connect the second container 407. The second plug 406 in the second mounting seat 404 pierces the second sealing film 408 at the mouth of the second container 407 and is inserted into the liquid medicine in the second container 407. The mouth of the second container 407 and the third gasket 405 in the second mounting seat 404 are squeezed and sealed. The diameter ratio of the two second containers 407 in the double-tube container assembly 400 is selected according to the ratio of the drugs to be injected. During the synchronous movement of the second pistons 410 in the two second containers 407 under the action of negative pressure through the U-shaped rod 409, the liquid medicine can be quantitatively injected into the corresponding syringe barrels 101 according to the ratio. The ratio and dosage of the liquid medicine in the two syringe barrels 101 can be achieved by adjusting the amplitudes of the two first pistons 108.

Claims

1. A multi-barreled syringe for animals, used for quantitatively injecting multiple liquid medicines into animals in proportion, characterized in that: include: The syringe assembly is used to mix multiple liquid medicines in proportion during the injection process; The liquid pressing component is used to store the mixed liquid medicine injected by the syringe component and discharge the medicine at a fixed time by itself; The injection needle assembly is used to inject the mixed liquid medicine discharged from the liquid pressing assembly into the animal body at a fixed time and automatically detach.

2. A multi-barrel syringe for veterinary use according to claim 1, characterized in that: The injection needle assembly comprises a circular plate, wherein a third guide rod is slidably arranged in three first sliding grooves uniformly distributed circumferentially on the circular plate, a first ring plate is arranged at one end of the three third guide rods, a second stop block is arranged at the other end of the third guide rod to prevent it from being separated from the first sliding groove, a fourth ring sleeve is arranged in the first ring plate, a cylindrical liquid shell is slidably arranged in the fourth ring sleeve, a first injection nozzle for mounting a needle is arranged at one end of the liquid shell, the other end of the liquid shell is fixedly connected to the circular plate through a push rod, a second liquid inlet pipe is arranged on the side wall of the liquid shell, the second liquid inlet pipe moves in the second sliding groove on the fourth ring sleeve, a damping cylinder is slidably arranged on the push rod, a third piston is arranged on the push rod, the third piston seals and slides in the damping cylinder, three liquid-passing holes uniformly distributed circumferentially and passing through both ends of the third piston are opened on the third piston, three lock assemblies corresponding to the third guide rods one by one and matched with the lock grooves on the corresponding third guide rods are arranged on the circular plate, three second trigger rods corresponding to the lock assemblies one by one are arranged on the end surface of the damping cylinder, the second trigger rod Sliding in the jack on the circular plate, a circular ring is arranged on the outer side of the damping cylinder, three third sliding grooves are opened circumferentially on the cylindrical surface of the circular ring, a first inner rod cooperating with a first limit block in one end of a fourth ring sleeve is slidably arranged in the third sliding groove, a connecting rod is arranged on the first inner rod, a first inclined surface is arranged on the first limit block, a fourth spring for making the corresponding first inner rod move outward is arranged in the third annular groove, three circumferentially uniformly distributed first trigger rods are axially slid in the fourth guide sleeve on the outer side of the damping cylinder, a fifth spring for resetting the first trigger rod is arranged in the fourth guide sleeve, one end of the first trigger rod cooperates with the circular plate, the other end of the first trigger rod cooperates with the oblique rod on the corresponding connecting rod, a sixth spring is connected between the first ring plate and the circular plate, a seventh spring is connected between the second ring plate on the outer side of the damping cylinder and the circular plate, a positioning sleeve for positioning the sixth spring is arranged on the circular plate, a handle sleeve is arranged on the edge of the circular plate, an anti-slip pattern is opened on the outer cylindrical surface of the handle sleeve, and a pressing ring cooperating with the surface of the animal is arranged at the end of the fourth ring sleeve.

3. A multi-barrel syringe for veterinary use according to claim 2, characterized in that: The lock assembly includes a rod sleeve, which slides radially along the circular plate in a third guide sleeve on the circular plate, a second inner rod is slidably arranged in the rod sleeve and cooperates with a locking groove on the corresponding third guide rod, a second inclined surface is arranged on the inner wall of the locking groove, an eighth spring is arranged in the rod sleeve to make the second inner rod move toward the third guide rod, a third inclined surface is formed at the end of the rod sleeve and cooperates with the corresponding second trigger rod, two tension spring plates are symmetrically arranged on the rod sleeve, and the tension spring plates are connected to the end face of the third guide sleeve through a ninth spring.

4. A multi-barrel syringe for veterinary use according to claim 1, characterized in that: The syringe assembly includes two injection cartridges fixedly connected together, the end of the injection cartridge is provided with a first injection nozzle and a pipette, the pipette is provided with a first one-way valve assembly, the end of the pipette is provided with a first mounting seat for mounting a single-tube container assembly or a double-tube container assembly, the middle part of the first mounting seat is provided with a first plug which is connected with the pipette and cooperates with the single-tube container assembly or the double-tube container assembly, a first piston is slidably arranged in the injection cartridge, a first push-pull rod is provided at the end of the first piston, the first push-pull rod is slidably arranged in a circular groove at the end of the second push-pull rod, a first spring which makes the first push-pull rod and the second push-pull rod contract to the limit is provided in the circular groove, one end of the first spring is connected to the first push-pull rod on the first push-pull rod. A compression spring ring is connected, the other end of the first spring is connected to the inner wall of the circular groove, a first ring sleeve is axially slidable in the injection cartridge, the first ring sleeve is provided with a scale indicating the amount of medicine in the injection cartridge, a transparent window is provided on the wall of the injection cartridge, and a marking line indicating the scale on the first ring sleeve is provided in the middle of the transparent window, a second ring sleeve threadedly connected to the first ring sleeve is rotatably provided in the injection cartridge, a rotary sleeve connected to the second ring sleeve is provided on the outside of the injection cartridge, and anti-slip grooves are provided on the outer cylindrical surface of the rotary sleeve, a connecting rod is hinged at the end of the second push-pull rod, a first handle is hinged at the end of the connecting rod, the first handle is hinged to the second handle provided on the injection cartridge, and a vortex spring is connected between the first handle and the second handle.

5. A multi-barrel syringe for veterinary use according to claim 4, characterized in that: The single-tube container assembly consists of a first container and a first sealing film at the mouth of the first container. The first container is threadedly matched with a corresponding first mounting seat, and the first container is matched with a first sealing gasket arranged in the first mounting seat.

6. A multi-barrel syringe for veterinary use according to claim 4, characterized in that: The double-tube container assembly includes a U-shaped tube, both ends of the U-shaped tube are provided with a second mounting seat, the middle part of the second mounting seat is provided with a second plug connected to the U-shaped tube, the middle part of the U-shaped tube is provided with a reducer connected to the U-shaped tube and a third ring sleeve threadedly connected to the corresponding first mounting seat, the reducer and the third ring sleeve are respectively matched with the corresponding first mounting seat with a second sealing gasket and a first sealing gasket, the second mounting seat is internally threaded with a second container, the second container and the second mounting seat are matched with a third sealing gasket, the mouth of the second container is provided with a second sealing film, and two second pistons synchronously connected by a U rod are slidably provided in the two second containers corresponding to the U-shaped tube.

7. A multi-barrel syringe for veterinary use according to claim 4, characterized in that: The first one-way valve assembly includes a first shell body arranged on the pipette, a first guide sleeve is arranged in the first shell body through a first fixed rod, a first guide rod is slidably arranged in the first guide sleeve, a first valve plug for switching the pipette is arranged at the end of the first guide rod, and a second spring is connected between the first valve plug and the first guide sleeve.

8. A multi-barrel syringe for veterinary use according to claim 2, characterized in that: The liquid pressure component includes an elastic bag, and a first liquid inlet pipe and a liquid outlet pipe are respectively provided at both ends of the elastic bag. The first liquid inlet pipe is connected to the first injection nozzles of two injection cartridges through a Y-shaped first hose, and the first hose is plug-fitted with the first injection nozzle and threadedly connected to the first liquid inlet pipe. The liquid outlet pipe is connected to the second liquid inlet pipe through a second hose, and the two ends of the second hose are respectively threadedly connected to the liquid outlet pipe and the second liquid inlet pipe. A second one-way valve assembly is provided on the first liquid inlet pipe, and a third one-way valve assembly is provided on the liquid outlet pipe.

9. A multi-barrel syringe for veterinary use according to claim 8, characterized in that: The structure of the second one-way valve assembly is the same as that of the third one-way valve assembly. The second one-way valve assembly includes a second shell, which is arranged on the first liquid inlet pipe or the liquid outlet pipe. A second guide sleeve is arranged in the second shell through a second fixed rod. A second guide rod is slidably arranged in the second guide sleeve. A second valve plug for switching the first liquid inlet pipe or the liquid outlet pipe is arranged at the end of the second guide rod, and a third spring is connected between the second valve plug and the second guide sleeve.

10. A multi-barrel syringe for veterinary use according to claim 9, characterized in that: Two limit rods for limiting the opening range of the corresponding second valve plugs are arranged in the second housing of the third one-way valve assembly.

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