Handheld anti-backflow drenching tool for animal husbandry and veterinary medicine

Abstract

The invention discloses a handheld anti-backflow drenching tool for animal husbandry and veterinary medicine in the technical field of animal husbandry instruments, which comprises a drenching gun, and an injection head and a trigger on the drenching gun, and further comprises a sleeve head, the sleeve head is provided with an avoiding hole coaxial with a liquid outlet hole of the injection head, and liquid baffles are embedded in two sides of the inner wall of the avoiding hole; the control mechanism is in transmission connection with the trigger, and the trigger can control the liquid baffle to be closed through the control mechanism in the buckling process; the sleeve head is arranged to protect the injection head, so that in the process that the injection head enters a livestock body, under the cooperation of the flushing effect of liquid medicine and the isolation effect of the sleeve head, the livestock body fluid cannot contaminate the injection head, and further, after the trigger is loosened, even if the injection head flows back, the injection head cannot be contaminated. Livestock body fluid cannot pollute liquid medicine stored in the perfusion gun through the injection head.

Description

Technical Field

[0001] This invention relates to the field of livestock equipment technology, specifically a handheld veterinary medicine administration tool to prevent backflow. Background Technology

[0002] A typical drug delivery device consists of a storage section, a propulsion section, and an injection section. The propulsion section pushes the drug solution from the storage section out through the injection section, thus completing the drug delivery process.

[0003] To meet the needs of multiple uses, common medication delivery tools have a storage section that stores enough medication for multiple administrations. During administration, when the propulsion section pushes out the medication, the area where the propulsion section and the medication directly interact is compressed and accumulates elastic potential energy. After one injection is completed and the driving force on the propulsion section is removed, the accumulated elastic potential energy is released instantaneously, causing the propulsion section to move backward, thus creating a negative pressure inside the tool. This negative pressure can cause the residual medication in the injection section to flow back, and may even cause the injection section to draw a small amount of bodily fluid from the animal, ultimately contaminating the remaining medication in the storage section. Summary of the Invention

[0004] The purpose of this invention is to provide a handheld veterinary medicine administration tool to prevent backflow, thereby solving the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a handheld animal husbandry and veterinary anti-backflow injection tool, including an injection gun, an injection head and a trigger on the injection gun, and a sleeve, wherein the sleeve is provided with a clearance hole coaxial with the liquid outlet hole of the injection head, and a liquid baffle is embedded on both sides of the inner wall of the clearance hole. A control mechanism is connected to the trigger drive, and the trigger can control the baffle plate to close during the engagement process.

[0006] Preferably, the control mechanism includes protrusions symmetrically arranged inside the sleeve and respectively connected to the liquid baffle. The protrusions are slidably connected along the axial direction of the sleeve, and the liquid baffle is elastically slidably connected to the sleeve along the radial direction of the sleeve. The liquid baffle is subjected to an elastic force away from the axis of the sleeve. The injection gun is provided with a transmission unit, which is used to control the protrusions to move relative to the sleeve along the axial direction of the sleeve.

[0007] Preferably, the sleeve is sleeved with the injection head, a pressure ring is slidably connected to the inner wall of the sleeve along the axial direction of the sleeve, the protrusion is fixedly connected to the pressure ring, a spring is fixedly connected to the end of the protrusion away from the pressure ring, and the pressure ring abuts against the end of the injection head.

[0008] Preferably, the transmission unit includes a mounting block, the mounting block having a groove whose trajectory is parallel to the axial direction of the sleeve, a sliding column slidably connected in the groove, the axis of the sliding column being perpendicular to the axis of the sleeve; a rope is connected to the sliding column, the other end of the rope being connected to the sleeve, and a tensioning unit is drivenly connected to the sliding column, the trigger being able to pull the sliding column along the groove in a direction away from the sleeve through the tensioning unit.

[0009] Preferably, the tensioning unit includes a slide rail disposed on one side of the mounting block. A pressure block is elastically slidably connected to the slide rail. The pressure block abuts against the slide column. A transmission unit is externally connected to the pressure block. The transmission unit is connected to the trigger and is used to pull the pressure block away from the sleeve head.

[0010] Preferably, the mounting block has a second groove whose trajectory is parallel to the first groove, and the second groove is distributed radially along the sleeve outside the first groove. The ends of the first and second grooves away from the sleeve are connected to a U-shaped groove in the mounting block. The end of the pressure block near the second groove is fixedly connected to a stop block, and the end of the pressure block away from the sleeve is provided with a wedge surface. The trajectory of the slide rail gradually approaches the second groove in the direction away from the sleeve. When the pressure block is at its extreme position in the slide rail away from the sleeve, the end of the pressure block near the second groove protrudes to the side of the U-shaped groove bisecting surface near the second groove. The mounting block is provided with a reset unit, which is used to transfer the sliding column from the second groove to the first groove.

[0011] Preferably, the reset unit includes a push sleeve, which is slidably connected to the mounting block. The push sleeve is connected to a push block, the movement trajectory of which is on the second slide groove. The push sleeve encloses the mounting block, the slide rail, and the injection gun. Sealing plates are fixedly connected to both ends of the mounting block. The sealing plates are slidably connected to the inner wall of the push sleeve. The push sleeve can cooperate with the sealing plates to seal and protect the mounting block and the slide rail. The end of the push block near the first slide groove protrudes to the side of the U-shaped groove bisecting surface near the first slide groove. The rope passes through the sealing plate near the sleeve head.

[0012] Preferably, the protrusion has a recess on the side near the axial direction of the sleeve head, and two protrusions are symmetrically arranged in the recess along the axial direction of the sleeve head. The end of the baffle away from the axial direction of the sleeve head is in contact with the recessed side of the protrusion. The length of the second slide groove is more than twice that of the first slide groove, and the end of the second slide groove near the sleeve head passes through the mounting block and is in an open state.

[0013] Preferably, the push block is connected to the push sleeve by a plug-in snap-fit ​​connection.

[0014] Compared with the prior art, the beneficial effects of the present invention are: This invention protects the injection head by providing a protective cap. During the process of the injection head entering the animal's body, the animal's bodily fluids cannot contaminate the injection head due to the flushing effect of the medication and the isolation effect of the cap. Furthermore, even if backflow occurs in the injection head after the trigger is released, the animal's bodily fluids will not contaminate the medication stored in the injection gun through the injection head.

[0015] After the injection gun has finished injecting, the injection head is sealed and protected by a cap to prevent contamination. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the injection gun. Figure 3 These are the various points in the trigger-pulling process; Figure 4 This is a schematic half-sectional view of the sleeve and push sleeve of the present invention; Figure 5 for Figure 4 Enlarged schematic diagram of the structure at point A in the middle; Figure 6 for Figure 5 A schematic diagram of the structure after removing the slide rail connector; Figure 7 for Figure 6 A schematic diagram of the structure after removing the push sleeve and slide rail; Figure 8 for Figure 7 Rear view diagram; Figure 9 This is a schematic diagram of the compaction block.

[0017] The attached diagram lists the components represented by each number as follows: 1. Injection gun; 2. Injection head; 3. Trigger; 4. Sleeve; 5. Alternating hole; 6. Baffle; 7. Protrusion; 8. Pressure ring; 9. Spring; 10. Mounting block; 11. Slide groove one; 12. Slide groove two; 13. U-shaped groove; 14. Slide column; 15. Rope; 16. Slide rail; 17. Pressure block; 17-1. Wedge surface; 18. Stop block; 19. Push sleeve; 20. Push block; 21. Sealing plate. Detailed Implementation

[0018] Please see Figure 1-9 The present invention provides a technical solution: a handheld animal husbandry and veterinary anti-backflow injection tool, including an injection gun 1, an injection head 2 and a trigger 3 on the injection gun 1, and a sleeve 4, wherein the sleeve 4 is provided with a clearance hole 5 coaxial with the liquid outlet hole of the injection head 2, and a liquid baffle 6 is embedded on both sides of the inner wall of the clearance hole 5. The control mechanism is connected to the trigger 3 in a transmission manner. During the engagement process, the trigger 3 can control the baffle 6 to close through the control mechanism.

[0019] The entire process of pulling the trigger 3 is divided into three positions: a, b, and c. The initial position of the trigger 3 is a, b is the position that the trigger 3 passes through during the pulling process, and c is the extreme position of the trigger 3. During the administration of medication, the injection head 2 is inserted into the animal's body, and then the trigger 3 is pulled. During this process: a to b: Injection gun 1 injects the medication outward through injection head 2; b to c: The infusion gun 1 injects the liquid outward through the injection head 2, and at the same time the control mechanism is triggered and controls the baffle 6 to close; until the trigger 3 reaches c, the injection head 2 stops injecting and the baffle 6 is fully closed. During this process, the injection head 2 injects the medicine outward. Even if a small amount of animal body fluid gets on the injection head 2, it will be washed out of the cover head 4 by the sprayed medicine until the trigger 3 reaches c and the liquid baffle 6 is completely closed; thus isolating the animal body fluid outside the cover head 4 and preventing it from getting on the injection head 2. Then, pull the trigger 3, keeping it in position c, thereby keeping the baffle 6 closed, so that the injection head 2 is completely blocked by the sleeve 4 and the baffle 6. In this state, the injection gun 1 is removed from the animal's body; then, release the trigger 3. During this process: c to a: Reset each component; Next, rinse the head cover 4 to remove any animal bodily fluids that have come into contact with it, thus preventing cross-infection. The present invention protects the injection head 2 by setting a cover 4, so that during the process of the injection head 2 entering the animal's body, the animal's body fluid cannot contaminate the injection head 2 due to the flushing effect of the medicine and the isolation effect of the cover 4. Furthermore, even if the injection head 2 flows back after the trigger 3 is released, the animal's body fluid will not contaminate the medicine stored in the infusion gun 1 through the injection head 2.

[0020] Preferably, the control mechanism includes protrusions 7 symmetrically arranged inside the sleeve 4 and respectively connected to the liquid baffle 6. The protrusions 7 are slidably connected along the axial direction of the sleeve 4, and the liquid baffle 6 is elastically slidably connected to the sleeve 4 along the radial direction of the sleeve 4. The liquid baffle 6 is subjected to an elastic force away from the axis of the sleeve 4. The injection gun 1 is provided with a transmission unit, which is used to control the protrusions 7 to move relative to the sleeve 4 along the axial direction of the sleeve 4.

[0021] When the trigger 3 moves from b to c, the transmission unit controls the protrusion 7 to move relative to the sleeve 4 along the axial direction of the sleeve 4, thereby squeezing the baffle plate 6, causing the baffle plate 6 to overcome the elastic force and move in the direction of the sleeve 4 axis, so that the two baffle plates 6 close together.

[0022] Preferably, the sleeve 4 is sleeved with the injection head 2, and a pressure ring 8 is slidably connected to the inner wall of the sleeve 4 along the axial direction of the sleeve 4. The protrusion 7 is fixedly connected to the pressure ring 8, and a spring 9 is fixedly connected to the end of the protrusion 7 away from the pressure ring 8. The pressure ring 8 abuts against the end of the injection head 2.

[0023] When the trigger 3 moves from b to c, the transmission unit controls the sleeve 4 to slide towards the injection head 2, causing the sleeve 4 to move relative to the pressure ring 8 and the protrusion 7 connected to the pressure ring 8, thereby causing the baffle plate 6 to move relative to the protrusion 7, so that the baffle plate 6 is squeezed out by the protrusion 7 and closed. At the same time, the spring 9 is compressed during this process. When trigger 3 moves from c to a, the transmission unit controls the sleeve 4 to reset. Furthermore, the protrusion 7 resets relative to the baffle 6, allowing the baffle 6 to reset under the action of elastic force.

[0024] Preferably, the transmission unit includes a mounting block 10, which has a groove 11 whose trajectory is parallel to the axis of the sleeve 4. A sliding column 14 is slidably connected in the groove 11, and the axis of the sliding column 14 is perpendicular to the axis of the sleeve 4. The sliding column 14 is connected to a rope 15, the other end of which is connected to the sleeve 4. The sliding column 14 is drivenly connected to a tensioning unit, and the trigger 3 can pull the sliding column 14 along the groove 11 away from the sleeve 4 through the tensioning unit.

[0025] During the pulling of trigger 3, after trigger 3 reaches position b, as trigger 3 continues to be pulled toward position c, trigger 3 pulls slide column 14 along slide groove 11 away from sleeve head 4 through tensioning unit until trigger 3 reaches position c. At this point, slide column 14 moves to the limit position of slide groove 11 away from sleeve head 4. Furthermore, slide column 14 drives sleeve head 4 toward injection head 2 through rope 15, causing the liquid baffle 6 to close.

[0026] Preferably, the tensioning unit includes a slide rail 16, which is disposed on one side of the mounting block 10. The slide rail 16 is elastically slidably connected to a pressure block 17, which abuts against the slide column 14. The pressure block 17 is externally connected to a transmission unit, which is connected to the trigger 3. The transmission unit is used to pull the pressure block 17 away from the sleeve head 4.

[0027] During the process of trigger 3 moving from b to c, trigger 3 drives pressure block 17 to pull along slide rail 16 away from sleeve head 4 through transmission unit. Furthermore, pressure block 17 squeezes slide column 14 to move away from sleeve head 4. During the process of trigger 3 moving from c to a, the driving force of the transmission unit on the pressure block 17 is canceled, the pressure block 17 is reset under the action of the elastic force, and at the same time the sleeve head 4 is reset under the action of the elastic force of the spring 9, and drives the slide column 14 to move in the direction of the sleeve head 4.

[0028] Preferably, the mounting block 10 has a second slide groove 12 with a trajectory parallel to the first slide groove 11, and the second slide groove 12 is radially distributed outside the first slide groove 11 along the sleeve head 4. The ends of the first slide groove 11 and the second slide groove 12 away from the sleeve head 4 are connected to a U-shaped groove 13 opened in the mounting block 10. The end of the pressure block 17 near the second slide groove 12 is fixedly connected to a stop block 18. The end of the pressure block 17 away from the sleeve head 4 is provided with a wedge surface 17-1. The trajectory of the slide rail 16 gradually approaches the second slide groove 12 in the direction away from the sleeve head 4. When the pressure block 17 is at the extreme position in the slide rail 16 away from the sleeve head 4, the end of the pressure block 17 near the second slide groove 12 protrudes to the side of the U-shaped groove 13 bisecting the surface near the second slide groove 12. The mounting block 10 is provided with a reset unit, which is used to transfer the slide column 14 from the second slide groove 12 to the first slide groove 11.

[0029] During the process of trigger 3 moving from b to c, pressure block 17 squeezes slide column 14 to move towards U-shaped groove 13. When entering the bend of U-shaped groove 13, the wedge surface 17-1 squeezes slide column 14 into slide groove 2 12. At this time, pressure block 17 moves to the extreme position of slide rail 16 away from sleeve head 4. Then, under the action of spring 9, slide column 14 tends to move towards sleeve head 4 along slide groove 2 12 and remains stationary under the blocking action of stop block 18, thereby keeping the baffle plate 6 in the closed state. Then, when the trigger 3 is released, the pressure block 17 returns to its original position along the slide rail 16. Under the action of the spring force of the spring 9, the slide column 14 moves along the slide groove 12 towards the sleeve head 4 as the pressure block 17 returns to its original position. The corresponding pressure block 17 gradually moves away from the slide groove 12 until the pressure block 17 completely leaves the track of the slide groove 12 and no longer obstructs the slide column 14. Under the action of the spring force of the spring 9, the slide column 14 moves along the slide groove 12 towards the sleeve head 4 as the pressure block 17 returns to its original position. Next, when the injection gun 1 injects the medicine again, the reset unit transfers the slide column 14 from the slide groove 2 12 to the slide groove 11, so that the slide column 14 reaches the initial position of the slide groove 11, the baffle plate 6 reopens, and then the injection operation is repeated.

[0030] Preferably, the reset unit includes a push sleeve 19, which is slidably connected to the mounting block 10. The push sleeve 19 is connected to a push block 20, and the movement trajectory of the push block 20 is on the slide groove 12. The push sleeve 19 encloses the mounting block 10, the slide rail 16, and the injection gun 1. Sealing plates 21 are fixedly connected to both ends of the mounting block 10. The sealing plates 21 are slidably connected to the inner wall of the push sleeve 19. The push sleeve 19 can cooperate with the sealing plates 21 to seal and protect the mounting block 10 and the slide rail 16. The end of the push block 20 near the slide groove 11 protrudes to the side of the U-shaped groove 13 bisecting the slide groove 11. The rope 15 passes through the sealing plate 21 near the sleeve head 4.

[0031] After completing one injection and the slide column 14 stops in the second slide groove 12, the operator pushes the push sleeve 19 away from the sleeve head 4, so that the push sleeve 19 drives the push block 20 to move away from the sleeve head 4. Further, the push block 20 squeezes the slide column 14 to move into the U-shaped groove 13, and the U-shaped groove 13 enters the first slide groove 11. After the slide column 14 enters the first slide groove 11, the slide column 14 moves along the first slide groove 11 under the action of elasticity to the end of the first slide groove 11 close to the sleeve head 4. During this process, the exposed ends of the push sleeve 19 are sealed by the sealing plate 21, so that the mounting block 10 and slide rail 16 and other components inside the push sleeve 19 are sealed and protected, preventing the mounting block 10 and slide rail 16 and other components from getting contaminated with liquid, and protecting them.

[0032] Preferably, the protrusion 7 has a recess on the side near the axial direction of the sleeve head 4, and two protrusions are symmetrically arranged in the recess along the axial direction of the sleeve head 4. The end of the baffle plate 6 away from the axial direction of the sleeve head 4 is in contact with the recessed side of the protrusion 7. The length of the second slide groove 12 is more than twice that of the first slide groove 11, and the end of the second slide groove 12 near the sleeve head 4 passes through the mounting block 10 and is in an open state.

[0033] In the initial state, the baffle plate 6 is attached to the recess of the protrusion 7. At this time, the baffle plate 6 is at the extreme position far away from the axis of the sleeve head 4. Correspondingly, the two baffle plates 6 are in a fully open and closed state. Trigger 3 from a to b: Trigger 3 does not trigger the tensioning unit, and the baffle plate 6 remains open or closed; From b to c: Trigger 3 triggers the tensioning unit, and the baffle plate 6 gradually closes; during this process, rope 15 pulls the sleeve 4 toward the mounting block 10, and further, the baffle plate 6 moves with the sleeve 4 toward the mounting block 10 relative to the protrusion 7, so that the baffle plate 6 moves to the protrusion position on the side of the protrusion 7 away from the mounting block 10, so that the baffle plate 6 moves toward the axis of the sleeve 4, and the two baffle plates 6 close together; Trigger 3 moves from c to a: During this process, trigger 3 is released, and the corresponding slide column 14 switches into the slide groove 12. Under the elastic force of spring 9, the sleeve 4 moves away from the mounting block 10, while simultaneously driving the slide column 14 to slide along the slide groove 12 towards the sleeve 4. Correspondingly, the baffle plate 6 moves relative to the protrusion 7 towards the mounting block 10, so that the baffle plate 6 passes through the recess of the protrusion 7. At this time, the baffle plate 6 is fully opened. Then, the baffle plate 6 moves to the protruding position on the side of the protrusion 7 near the mounting block 10. Correspondingly, the slide column 14 moves to the end of the slide groove 12 near the sleeve 4 and is blocked by the push block 20. The two baffle plates 6 remain closed. After the injection gun 1 is filled, the injection head 2 is sealed and protected by the sleeve 4 to prevent the injection head 2 from being contaminated.

[0034] Preferably, the push block 20 is connected to the push sleeve 19 by a plug-in snap-fit ​​connection.

[0035] When the injection head 2 needs cleaning, the slide column 14 is controlled to enter the slide groove 12, and then the push block 20 is pulled out so that the push block 20 no longer obstructs the slide column 14 from continuing to move towards the sleeve head 4, thereby allowing the sleeve head 4 to continue to move away from the mounting block 10, so that the sleeve head 4 can be separated from the injection head 2.

Claims

1. A handheld veterinary medicine administration tool for preventing backflow, comprising an infusion gun (1), an injection head (2) and a trigger (3) on the infusion gun (1), characterized in that: Includes a sleeve (4), the sleeve (4) is provided with a clearance hole (5) coaxial with the liquid outlet hole of the injection head (2), and baffles (6) are embedded on both sides of the inner wall of the clearance hole (5). The control mechanism is connected to the trigger (3) in a transmission manner. During the engagement process, the trigger (3) can control the baffle (6) to close through the control mechanism.

2. The handheld veterinary medicine administration tool for preventing backflow as described in claim 1, characterized in that: The control mechanism includes protrusions (7) symmetrically arranged inside the sleeve (4) and respectively connected to the baffle plate (6). The protrusions (7) are slidably connected along the axial direction of the sleeve (4). The baffle plate (6) is elastically slidably connected to the sleeve (4) along the radial direction of the sleeve (4). The baffle plate (6) is subjected to an elastic force away from the axis of the sleeve (4). The injection gun (1) is provided with a transmission unit. The transmission unit is used to control the protrusions (7) to move relative to the sleeve (4) along the axial direction of the sleeve (4).

3. A handheld veterinary medicine administration tool for preventing backflow as described in claim 2, characterized in that: The sleeve (4) is sleeved with the injection head (2). The inner wall of the sleeve (4) is slidably connected with a pressure ring (8) along the axial direction of the sleeve (4). The protrusion (7) is fixedly connected with the pressure ring (8). A spring (9) is fixedly connected to the end of the protrusion (7) away from the pressure ring (8). The pressure ring (8) abuts against the end of the injection head (2).

4. A handheld veterinary medicine administration tool for preventing backflow as described in claim 3, characterized in that: The transmission unit includes a mounting block (10), which has a groove (11) with a trajectory parallel to the axis of the sleeve (4). A sliding column (14) is slidably connected in the groove (11), and the axis of the sliding column (14) is perpendicular to the axis of the sleeve (4). The sliding column (14) is connected to a rope (15), and the other end of the rope (15) is connected to the sleeve (4). The sliding column (14) is connected to a tensioning unit, and the trigger (3) can pull the sliding column (14) away from the sleeve (4) along the groove (11) through the tensioning unit.

5. A handheld veterinary medicine administration tool for preventing backflow as described in claim 4, characterized in that: The tensioning unit includes a slide rail (16), which is located on one side of the mounting block (10). The slide rail (16) is elastically slidably connected to a pressure block (17), which abuts against the slide column (14). The pressure block (17) is externally connected to a transmission unit, which is connected to the trigger (3). The transmission unit is used to pull the pressure block (17) away from the sleeve head (4).

6. A handheld veterinary medicine administration tool for preventing backflow as described in claim 5, characterized in that: The mounting block (10) has a second groove (12) with a trajectory parallel to the first groove (11), and the second groove (12) is radially distributed on the outside of the first groove (11) along the sleeve (4). The ends of the first groove (11) and the second groove (12) away from the sleeve (4) are connected to a U-shaped groove (13) on the mounting block (10). The end of the pressure block (17) near the second groove (12) is fixedly connected to a stop block (18), and the end of the pressure block (17) away from the sleeve (4) is provided with a wedge. On the surface (17-1), the trajectory of the slide rail (16) gradually approaches the slide groove two (12) in the direction away from the sleeve head (4). When the pressure block (17) is at the extreme position in the slide rail (16) away from the sleeve head (4), one end of the pressure block (17) near the slide groove two (12) protrudes to the side of the U-shaped groove (13) bisecting the slide groove two (12). The mounting block (10) is provided with a reset unit, which is used to transfer the slide column (14) from the slide groove two (12) to the slide groove one (11).

7. A handheld veterinary medicine administration tool for preventing backflow as described in claim 6, characterized in that: The reset unit includes a push sleeve (19), which is slidably connected to the mounting block (10). The push sleeve (19) is connected to a push block (20), and the movement trajectory of the push block (20) is on the second slide groove (12). The push sleeve (19) wraps around the mounting block (10), the slide rail (16), and the injection gun (1). The mounting block (10) is fixedly connected to two ends with sealing plates (21). The sealing plates (21) are slidably connected to the inner wall of the push sleeve (19). The push sleeve (19) can cooperate with the sealing plates (21) to seal and protect the mounting block (10) and the slide rail (16). The end of the push block (20) near the first slide groove (11) protrudes to the side of the bisecting surface of the U-shaped groove (13) near the first slide groove (11). The rope (15) passes through the sealing plate (21) near the end of the sleeve (4).

8. A handheld veterinary medicine administration tool for preventing backflow as described in claim 7, characterized in that: The protrusion (7) has a recess on the side near the axial direction of the sleeve (4). The protrusion (7) has two protrusions symmetrically arranged in the recess along the axial direction of the sleeve (4). The end of the baffle (6) away from the axial direction of the sleeve (4) is in contact with the recessed side of the protrusion (7). The length of the second slide groove (12) is more than twice that of the first slide groove (11), and the end of the second slide groove (12) near the sleeve (4) passes through the mounting block (10) and is in an open state.

9. A handheld veterinary medicine administration tool for preventing backflow as described in claim 8, characterized in that: The push block (20) is connected to the push sleeve (19) by a plug-in snap-fit.

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