Continuous drug injection device

Abstract

The present invention discloses a device for continuous drug injection, comprising a first syringe, a handle at the rear end of the first syringe, a first cavity opened inside the first syringe, a second syringe slidably connected inside the first cavity, a piston head fixedly connected to the front end of the second syringe, an annular groove provided on the side wall of one end of the piston head close to the second syringe, a first rubber piston movably sleeved inside the annular groove, a top column provided at the front end of the first cavity, a T-shaped through hole opened inside the top column, the first cavity is interconnected with an inner hole through the T-shaped through hole, the inner hole is opened inside the injection head, the present invention is a double-layer syringe, the second cavity can extract physiological saline or glucose for flushing the tube in advance, the present device is mainly used in the case of using an indwelling needle pipeline, can improve the injection accuracy and also prevent multiple replacement of syringes to reduce work intensity, reduce medical risks, and improve safety.

Description

Technical Field

[0001] The present invention relates to the technical field of medical equipment, in particular to a continuous drug injection device. Background Art

[0002] Currently, intravenous injection of drugs is a very common method of drug administration in clinical work because it can take effect quickly and avoid the first-pass effect. However, in clinical practice, intravenous injection of drugs often has requirements for drug concentration and injection speed. For example, intravenous injection of furosemide is often injected as a stock solution, and intravenous injection of contrast agents requires strict calculation of the drug concentration, and the injection dose often has strict requirements. There is often residue in the drug administration pipeline after injection. The current conventional practice is to flush the tube after injecting the drug, that is, to replace the syringe after injecting the drug or use the original syringe to re-absorb and then inject normal saline or glucose again. This complicates clinical work, not only increases the workload of nursing staff, but also increases the risk of nosocomial infection. Especially for patients using indwelling needles, due to the existence of the indwelling needle pipeline, a part of the drug solution will inevitably be retained in the pipeline after the drug is injected, resulting in inaccurate quantitative measurement. For this reason, we have proposed a device that can continuously inject drugs. Summary of the Invention

[0003] The object of the present invention is to provide a continuous drug injection device to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned object, the present invention provides the following technical solution: a continuous drug injection device, comprising a first syringe, a handle provided at the rear end of the first syringe, a first cavity defined in the interior of the first syringe, a second syringe slidably connected to the interior of the first cavity, a piston head fixedly connected to the front end of the second syringe, an annular groove provided on the side wall of the end of the piston head close to the second syringe, a first rubber piston movably sleeved in the interior of the annular groove, a first piston handle provided at the rear end of the second syringe, a second cavity defined in the interior of the second syringe, a piston shaft slidably connected to the interior of the second cavity, a second rubber piston movably engaged with the front end of the piston shaft, and a second piston handle fixedly connected to the rear end of the piston shaft;

[0005] A top column is provided at the front end of the first cavity, and a T-shaped through hole is opened inside the top column. The first cavity is communicated with the inner hole through the T-shaped through hole. The inner hole is opened inside the injection head, and the injection head is fixedly connected to the front end of the first syringe. One end of the top column passes through a rubber ring and is movably connected to the ball valve. The rubber ring is clamped to the end of the piston head through an annular block. The ball valve is slidably connected to the inside of the one-way cavity through an elastic clamp. The one-way cavity is opened inside the piston head, and the one-way cavity is communicated with the second cavity through a connecting hole opened inside the piston head.

[0006] Preferably, an indwelling needle pipeline is movably clamped on the injection head, the indwelling needle pipeline is engaged and connected with the fastening sleeve, and the fastening sleeve is fixedly connected to the front end of the first syringe.

[0007] Preferably, a plurality of reinforcing plates are provided on the side walls of the second syringe and the piston shaft.

[0008] Preferably, scale lines are provided on the side wall of the first syringe.

[0009] Preferably, the elastic clip is made of medical-grade PVC or medical-grade stainless steel.

[0010] Preferably, the elastic clamp is a spring or a spring.

[0011] Preferably, a first external thread is provided on the side wall of the end of the piston head away from the second syringe, and the first external thread is engaged with a first internal thread provided on the front end side wall of the first cavity. A second external thread is provided on the side wall of the second syringe, and the second external thread is engaged with a second internal thread provided on the rear end side wall of the first cavity.

[0012] Preferably, the end of the rubber ring close to the top column is a concave ring surface.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention is a double-layer syringe, and the second cavity can extract the physiological saline or glucose for flushing the tube in advance. The second syringe is rotated counterclockwise to disengage the first external thread and the second external thread from the first internal thread and the second internal thread respectively. The second cavity is not connected to the outside world because the ball valve seals the entrance of the one-way cavity. The external syringe is similar to a general medical syringe. The injection dosage and injection speed are strictly controlled according to the scale line on the first syringe. When the outer layer of the drug is injected, the first external thread and the second external thread are fully engaged with the first internal thread and the second internal thread respectively by rotating the second syringe clockwise. At this time, the push column pushes the ball valve into the inside of the one-way cavity, so that the physiological saline or glucose inside the second cavity can be directly flushed without changing the syringe, which reduces the complexity of clinical work, not only reduces the workload of nursing staff, but also reduces the risk of nosocomial infection, and also makes the quantitative injection of drugs more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the present invention;

[0015] Figure 2 This is a schematic structural diagram of the second needle cylinder of the present invention after it slides out of the first cavity;

[0016] Figure 3 is a cross-sectional view of the present invention;

[0017] Figure 4This is a schematic diagram of the explosion structure of the piston head of the present invention;

[0018] Figure 5 For the present invention Figure 3 A magnified view of point A;

[0019] Figure 6 It is a partial cross-sectional view of the top column of the present invention;

[0020] Figure 7 This is a schematic diagram of the explosion of the structure after the piston shaft of the present invention slides out of the second cavity;

[0021] Figure 8 It is a structural schematic diagram of the top column of the present invention;

[0022] Figure 9 It is a structural schematic diagram of the rubber ring of the present invention;

[0023] Figure 10 This is a schematic structural diagram of the elastic clip of the present invention.

[0024] In the figure: 1. first syringe, 2. first cavity, 3. first handle, 4. second syringe, 5. reinforcement plate, 6. piston head, 7. annular groove, 8. first rubber piston, 9. first external thread, 10. second external thread, 11. one-way cavity, 12. elastic clamp, 13. ball valve, 14. annular block, 15. rubber ring, 16. top column, 17. first internal thread, 18. second internal thread, 19. connecting hole, 20. second cavity, 21. first piston handle, 22. piston shaft, 23. second piston handle, 24. second rubber piston, 25. T-shaped through hole, 26. injection head, 27. fastening sleeve, 28. inner hole, 29. indwelling needle pipeline, 30. scale line. DETAILED DESCRIPTION

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] See also Figure 1-10The present invention provides a technical solution: a continuous drug injection device, comprising a first syringe 1, a handle 3 is provided at the rear end of the first syringe 1, a first cavity 2 is opened inside the first syringe 1, the first cavity 2 is used to inject the main medicine, a second syringe 4 is slidably connected to the inside of the first cavity 2, a piston head 6 is fixedly connected to the front end of the second syringe 4, an annular groove 7 is provided on the side wall of the end of the piston head 6 close to the second syringe 4, a first rubber piston 8 is movably sleeved inside the annular groove 7, and the side wall of the first rubber piston 8 is sealed with the inner wall of the first cavity 2. The rear end of the second syringe 4 is provided with a first piston handle 21, which is pushed when injecting the medicine. A second cavity 20 is opened inside the second syringe 4, and the second cavity 20 stores physiological saline or glucose for flushing the tube. A piston shaft 22 is slidably connected to the interior of the second cavity 20. The front end of the piston shaft 22 is movably connected to a second rubber piston 24. The side wall of the second rubber piston 24 is sealed against the inner wall of the second cavity 20. The rear end of the piston shaft 22 is fixedly connected to a second piston handle 23, which is pushed when injecting physiological saline or glucose.

[0027] A top column 16 is provided at the front end of the first cavity 2, and a T-shaped through hole 25 is opened inside the top column 16. The first cavity 2 is communicated with the inner hole 28 through the T-shaped through hole 25, and the first cavity 2 and the second cavity 20 are both connected to the inner hole 28 through the T-shaped through hole 25, thereby communicating with the outside world. The inner hole 28 is opened inside the injection head 26, and the injection head 26 is fixedly connected to the front end of the first syringe 1. One end of the top column 16 passes through the rubber ring 15 and is movably connected to the ball valve 13. When the first piston handle 21 is pushed and injected, the rubber ring 15 is sealed with the front side wall of the first cavity 2, and the top column 16 pushes the ball valve 13 into the inside of the one-way cavity 11. At this time, the first cavity 1 is blocked from the outside world, and the second cavity 20 is communicated with the outside world. In this state, the second cavity 1 is slid into the one-way cavity 11. The piston handle 23 injects the normal saline or glucose inside the second cavity 20. When the device extracts liquid in the first cavity 2, the top column 16 is disengaged from the ball valve 13. The ball valve 13 is tightly connected to the rubber ring 15 under the action of the elastic clamp 12, blocking the port of the one-way cavity 11. The first cavity 2 is connected to the outside world, and the second cavity 20 is not connected to the outside world. In this state, the first piston 21 is slid to fill the interior of the first cavity 2 with medicine. The rubber ring 15 is clamped to the end of the piston head 6 through the annular block 14. The ball valve 13 is slidably connected to the inside of the one-way cavity 11 through the elastic clamp 12. The one-way cavity 11 is opened inside the piston head 6. The one-way cavity 11 is connected to the second cavity 20 through the connecting hole 19 opened inside the piston head 6.

[0028] Specifically, the injection head 26 is movably connected to a retention needle line 29, and the retention needle line 29 is engaged with the fastening sleeve 27. The fastening sleeve 27 is fixedly connected to the front end of the first syringe 1. The engagement of the retention needle line 29 with the fastening sleeve 27 can make the retention needle line 29 and the injection head 26 more firmly connected.

[0029] Specifically, a plurality of reinforcing plates 5 are provided on the side walls of the second syringe 4 and the piston shaft 22. The reinforcing plates 5 prevent the second syringe 4 and the piston shaft 22 from tilting or eccentrically sliding in the corresponding cavity, thereby preventing the first rubber piston 8 and the second rubber piston 24 at the front end from being poorly sealed after tilting or eccentricity.

[0030] Specifically, a scale line 30 is provided on the side wall of the first syringe 1. The drug dosage and injection speed of the injection are strictly controlled according to the scale line 30 on the first syringe 1. Due to the presence of the rubber ring 15, it is impossible for the device to completely push the drug into the first cavity 2. A small amount will remain in the first cavity 2. The specific amount is determined by the size of the rubber ring 15. Generally, the size of the rubber ring 15 is small and the volume here can be ignored. In addition, the size of the rubber ring 15 is fixed for this device, so the residual amount can be determined. The scale line 30 can be adjusted to calculate this margin to achieve more accurate quantitative determination.

[0031] Specifically, the elastic clip 12 is made of medical-grade PVC or medical-grade stainless steel to prevent contamination caused by material problems.

[0032] Specifically, the elastic clamp 12 is a spring or a spring, and its purpose is to push the ball valve 13 up to form a seal with the rubber ring 15 when the main medicine in the first cavity 2 is pushed, so as to prevent confusion with the liquid in the second cavity 20, and the elastic clamp 12 will not block the communication between the connecting hole 19 and the one-way cavity 11. Figure 4 The elastic clamp 12 shown is a spring. Figure 10 The elastic clamping member 12 shown may also be a spring, and any elastic clamping member 12 having the above-mentioned effects is sufficient.

[0033] Specifically, in order to ensure the stability of the pipeline connection after the main drug (such as furosemide) is injected, a first external thread 9 is provided on the side wall of the piston head 6 away from the second syringe 4, and the first external thread 9 is engaged with the first internal thread 17 provided on the front end side wall of the first cavity 2. A second external thread 10 is provided on the side wall of the second syringe 4, and the second external thread 10 is engaged with the second internal thread 18 provided on the rear end side wall of the first cavity 2. The second syringe 4 is rotated clockwise to fully engage the first external thread 9 and the first internal thread 17, and fully engage the second external thread 10 and the second internal thread 18, and the two are engaged or separated at the same time. After engagement, the second syringe 4 is fixed and inactive inside the first cavity 2 to prevent the physiological saline or glucose used for flushing in the second cavity 20 from entering the first cavity 2 again during injection.

[0034] Specifically, one end of the rubber ring 15 close to the top column 16 is a concave ring surface, which will expand inward after being squeezed, thereby achieving a higher sealing effect in a smaller volume.

[0035] Working principle: When in use, first rotate the second syringe 4 clockwise to make the first external thread 9 and the second external thread 10 fully mesh with the first internal thread 17 and the second internal thread 18 respectively, and the top column 16 pushes the ball valve 13 into the inside of the one-way cavity 11, and the rubber ring 15 is sealed with the front side wall of the first cavity 2. At this time, the first cavity 1 is blocked from the outside, and the second cavity 20 is connected to the outside. In this state, pull the second piston handle 23 to draw physiological saline or glucose into the interior of the second cavity 20. After drawing an appropriate amount, rotate the second syringe 4 counterclockwise to make the first external thread 9 and the second external thread 10 disengage from the first internal thread 17 and the second internal thread 18 respectively. At this time, the rubber ring 15 is separated from the front side wall of the first cavity 2, the ball valve 13 is separated from the top column 16 and is sealed with the side of the rubber ring 15 by the elastic force of the elastic clip 12, blocking the mouth of the one-way cavity 11. Therefore, the first cavity 2 is connected to the outside, and the second cavity 20 is blocked from the outside. In this state The first piston 21 is pulled down to extract the medicine into the first cavity 2 according to the scale. Then, the fastening sleeve 27 of the device is connected to the indwelling needle pipeline 29 to push the medicine. When the injection is completed, the second syringe 4 is rotated clockwise so that the first external thread 9 and the second external thread 10 are fully engaged with the first internal thread 17 and the second internal thread 18 respectively. The push column 16 pushes the ball valve 13 into the inside of the one-way cavity 11, and the rubber ring 15 is sealed with the front side wall of the first cavity 2. At this time, the first cavity 1 is blocked from the outside, and the second cavity 20 is connected to the outside. In this state, the second piston handle 23 is pushed to inject the normal saline or glucose in the second cavity 20 into the indwelling needle pipeline 29, flushing the indwelling needle pipeline 29 to prevent the residual main medicine from causing inaccurate injection volume. The device is mainly used in the case of using an indwelling needle pipeline 29, which can improve the injection accuracy and also prevent multiple syringe changes, reduce work intensity, reduce medical risks, and improve safety.

[0036] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A continuous drug injection device, comprising a first syringe (1), characterized in that: The first syringe (1) has a handle (3) at the rear end thereof, a first cavity (2) is formed inside the first syringe (1), a second syringe (4) is slidably connected inside the first cavity (2), a piston head (6) is fixedly connected at the front end thereof, an annular groove (7) is formed on the side wall of the end of the piston head (6) close to the second syringe (4), a first rubber piston (8) is movably sleeved inside the annular groove (7), a first piston handle (21) is formed at the rear end thereof, a second cavity (20) is formed inside the second syringe (4), a piston shaft (22) is slidably connected inside the second cavity (20), a second rubber piston (24) is movably clamped at the front end of the piston shaft (22), and a second piston handle (23) is fixedly connected at the rear end thereof; A top column (16) is provided at the front end of the first cavity (2), a T-shaped through hole (25) is formed inside the top column (16), the first cavity (2) is communicated with an inner hole (28) via the T-shaped through hole (25), the inner hole (28) is formed inside an injection head (26), the injection head (26) is fixedly connected to the front end of the first syringe (1), one end of the top column (16) passes through a rubber ring (15) and is movably connected to a ball valve (13), the rubber ring (15) is clamped to the end of a piston head (6) via an annular block (14), the ball valve (13) is slidably connected to the one-way cavity (6) via an elastic clamp (12). The one-way cavity (11) is formed inside the piston head (6), the one-way cavity (11) is connected to the second cavity (20) via a connecting hole (19) formed inside the piston head (6), a first external thread (9) is provided on the side wall of the piston head (6) at one end away from the second syringe (4), the first external thread (9) is meshingly connected with a first internal thread (17) provided on the front end side wall of the first cavity (2), a second external thread (10) is provided on the side wall of the second syringe (4), the second external thread (10) is meshingly connected with a second internal thread (18) provided on the rear end side wall of the first cavity (2); The second syringe (4) is rotated clockwise so that the first external thread (9) and the first internal thread (17) are fully meshed, and the second external thread (10) and the second internal thread (18) are fully meshed, and the two are meshed or separated at the same time. After the meshing, the second syringe (4) is fixed in the first cavity (2) and does not move, so as to prevent the physiological saline or glucose used for flushing in the second cavity (20) from entering the first cavity (2) again during injection; When in use, the second syringe (4) is first rotated clockwise so that the first external thread (9) and the second external thread (10) are fully meshed with the first internal thread (17) and the second internal thread (18) respectively at the same time, and the push column (16) pushes the ball valve (13) into the inside of the one-way cavity (11), and the rubber ring (15) is sealed with the front side wall of the first cavity (2). At this time, the first cavity (2) is blocked from the outside, and the second cavity (20) is connected to the outside. In this state, the second piston handle (23) is pulled to draw physiological saline or glucose into the inside of the second cavity (20). After drawing an appropriate amount, the second syringe (4) is rotated counterclockwise so that the first external thread (9 ) and the second external thread (10) are respectively disengaged from the first internal thread (17) and the second internal thread (18) at the same time, at which time the rubber ring (15) is separated from the front side wall of the first cavity (2), the ball valve (13) is separated from the top column (16) and is sealed with the side of the rubber ring (15) by the elastic force of the elastic clamp (12), thereby blocking the mouth of the one-way cavity (11), so that the first cavity (2) is connected to the outside world, and the second cavity (20) is not connected to the outside world. In this state, the first piston handle (21) is pulled into the first cavity (2) to quantitatively extract the drug according to the scale, and the end of the rubber ring (15) close to the top column (16) is a concave annular surface.

2. A continuous drug injection device according to claim 1, characterized in that: An indwelling needle pipeline (29) is movably clamped on the injection head (26), and the indwelling needle pipeline (29) is meshedly connected to the fastening sleeve (27), and the fastening sleeve (27) is fixedly connected to the front end of the first syringe (1).

3. A continuous drug injection device according to claim 1, characterized in that: A plurality of reinforcing plates (5) are provided on the side walls of the second syringe (4) and the piston shaft (22).

4. A continuous drug injection device according to claim 1, characterized in that: The side wall of the first syringe (1) is provided with scale marks (30).

5. A continuous drug injection device according to claim 1, characterized in that: The elastic clamp (12) is made of medical-grade PVC or medical-grade stainless steel.

6. A continuous drug injection device according to claim 1, characterized in that: The elastic clamp (12) is a spring or a spring sheet.

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