A hand-rotary type precision syringe

Abstract

The present application provides a kind of manual rotation type quantitative precision injector, including outer cover and core rod, the rear end of outer cover is equipped with buckle plate, buckle plate is fixedly connected with the rear end of outer cover, core rod is equipped with dose snap ring, dose snap ring includes boss surface and parallel end face, buckle plate is equipped with center hole, center hole includes flat end, open end and flat end, flat end cooperates with boss surface, flat end cooperates with parallel end face, the inner diameter of center hole front portion gradually decreases from front to back, boss surface of dose snap ring is easy to break through flat end of center hole when core rod is pulled back, boss surface of dose snap ring is limited by flat end of center hole when core rod is pushed forward;The present application adopts the structure of injection combined with one-way through and rotation, which can prevent over-injection, control the amount of injector injection liquid, accurately extract injection or transfer medicine, and prevent medical accidents.

Description

Technical Field

[0001] This invention relates to the field of syringes, and more particularly to a manually operated rotary precision syringe. Background Technology

[0002] A syringe is a device used to inject or aspirate liquids. Syringes usually have graduations indicating the volume of liquid in the syringe. Currently, the volume of liquid injected using existing syringes is determined manually by the graduations on the syringe tube. This is highly susceptible to human error and can easily lead to over-injection, resulting in an excessive single injection volume and potentially causing medical accidents. Summary of the Invention

[0003] The purpose of this invention is to provide a manually operated rotary precision injector.

[0004] To achieve the above objectives, the technical solution of the present invention is as follows:

[0005] A manually operated rotary precision syringe includes an outer casing and a plunger. The outer casing has a needle tube at its front end, and a sheath is fitted over the needle tube. The plunger is located inside the outer casing, and a piston is located at its front end. The outer casing includes a needle seat and a plunger sleeve. The syringe is characterized in that a retaining plate is provided at its rear end, and the retaining plate is fixedly connected to the rear end of the outer casing.

[0006] The rear part of the core rod is provided with several dose retaining rings. Each dose retaining ring includes a pair of radially symmetrical boss surfaces and a pair of parallel end surfaces. The buckle plate is provided with a central hole through the front and rear. The rear end of the central hole includes a radially symmetrical flat end surface, an open end surface, and a pair of radially symmetrical flat end surfaces. The inner diameter of the flat end surface matches the outer diameter of the boss surface, and the inner diameter of the flat end surface matches the outer diameter of the parallel end surface.

[0007] The inner diameter of the front part of the central hole gradually decreases from front to back, and the thickness of the front part of the central hole gradually decreases from the outside to the inside, so that when the core rod is pulled back, the boss surface of the dose retaining ring can easily break through the flat end face of the central hole, while when the core rod is pushed forward, the boss surface of the dose retaining ring is limited by the flat end face of the central hole.

[0008] Furthermore, the rear of the core rod is provided with a first dose retaining ring and a second dose retaining ring. When the first dose retaining ring and the second dose retaining ring are pulled back to the center hole of the buckle plate, the position of the core rod can be adjusted by rotating or not rotating.

[0009] Furthermore, when the first and second dose retainers are pushed forward to the center hole, the core rod can easily pass through when the parallel end faces of the first and second dose retainers are aligned with the flat end face of the center hole.

[0010] When the boss surfaces of the first and second dose retaining rings are aligned with the flat end face of the center hole of the buckle plate, the core rod is limited and cannot pass through.

[0011] Furthermore, the front end of the buckle plate is provided with a buckle, and the rear end of the outer cover is provided with a lock hole. The buckle is embedded in the lock hole, and the buckle and the lock hole form a latching structure.

[0012] Furthermore, a rigid retaining ring protrudes from the rear of the core rod, and a rigid stop is provided on the rear of the inner side of the outer sleeve. When the core rod is pushed forward, the rigid retaining ring is in an interference fit with the inner side of the outer sleeve, and when the core rod is pulled backward, the rigid retaining ring stops with the rigid stop of the outer sleeve.

[0013] Furthermore, the outer side of the outer casing is provided with a first dose mark and a second dose mark, which are spaced apart from front to back. When the first dose retainer ring reaches the center hole, the first dose mark is aligned with the front end of the piston, and when the second dose retainer ring reaches the center hole, the second dose mark is aligned with the front end of the piston.

[0014] Furthermore, the central recess at the rear end of the needle seat is provided with a cavity.

[0015] The present invention has a central hole in the buckle plate. When the core rod is pulled back to extract the medicine, the core rod retainer can pass over the outer buckle plate through the guide slope. The position of the core rod can be adjusted by rotating it. The retainer of the core rod can pass through the central hole. However, when the core rod is pushed to inject the medicine, the position of the core rod is adjusted by rotating it. The retainer of the core rod is not easy to pass over the outer elastic buckle. When it is necessary to continue pushing the injection, the position of the core rod must be adjusted by rotating it again before the next injection can be carried out.

[0016] The above-mentioned combination of unidirectional and rotary injection structures can prevent over-injection, control the amount of injectable solution, accurately extract and transfer drugs, and prevent medical accidents. Attached Figure Description

[0017] Figure 1 This is an overall structural diagram of the present invention;

[0018] Figure 2 This is a structural diagram of the push rod being pulled back according to the present invention;

[0019] Figure 3 This is a structural diagram of the push rod injection of the present invention;

[0020] Figure 4 This is a structural diagram showing the alignment of the flat end face of the center hole of the push plate with the parallel end face of the dose retainer;

[0021] Figure 5 Another structural diagram showing the alignment of the flat end face of the center hole of the push plate with the parallel end face of the dose retainer;

[0022] Figure 6A structural diagram showing the alignment of the flat end face of the center hole of the push plate with the boss face of the dose retainer ring;

[0023] Figure 7 Another structural diagram showing the alignment of the flat end face of the center hole of the push plate with the boss face of the dose retainer ring;

[0024] Figure 8 This is a schematic diagram of the first dosage marking on the outer casing of the present invention;

[0025] Figure 9 This is a schematic diagram of the second dosage marking on the outer casing of the present invention;

[0026] Figure 10 This is a schematic diagram of the low-residue design of the present invention.

[0027] Figure label:

[0028] 1. Buckle plate, 2. Outer jacket, 3. Core rod, 4. Piston, 5. Needle tube, 6. Needle sheath.

[0029] 11. Locking buckle, 12. Center hole, 13. Flat end face

[0030] 21 Keyhole, 22 First Dosage Marker, 23 Second Dosage Marker, 24 Cavity, 25 Hard Locking Clip

[0031] 31 Hard retaining ring, 32 Parallel end face, 33 Protruding face, 34 First dose retaining ring, 35 Second dose retaining ring. Detailed Implementation

[0032] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] This invention discloses a manually operated rotary precision syringe, such as... Figure 1 As shown, it includes an outer sleeve 2 and a core rod 3. The front end of the outer sleeve 2 is provided with a needle tube 5, and a sheath 6 is sleeved on the outside of the needle tube 5. The core rod 3 is placed inside the outer sleeve 2, and a piston 4 is provided at the front end of the core rod 3. The outer sleeve 2 includes a needle seat and a rod sleeve. A cavity 24 is provided in the central recess at the rear end of the needle seat. Figure 10 As shown, a low-residue design is formed between the cavity 24 and the front end of the piston 4.

[0034] like Figure 2 As shown, the rear end of the outer jacket 2 is provided with a buckle plate 1, which is fixedly connected to the rear end of the outer jacket 2. The front end of the buckle plate 1 is provided with a latch 11, and the rear end of the outer jacket 2 is provided with a lock hole 21. The latch 11 is embedded in the lock hole 21. The buckle 1 and the latch 11 of the buckle plate 1 and the lock hole 21 on the rolled edge end face of the outer jacket 2 form a latching structure, and the buckle plate 1 is fixed on the rolled edge end face of the outer jacket 2.

[0035] See Figure 3 The buckle plate 1 has a central hole 12 running through it from front to back, such as Figures 4-7 As shown, the rear end of the central hole 12 includes a radially symmetrical flat end face, an open end face, and a pair of radially symmetrical flat end faces 13. The flat end face, the open end face, and each flat end face 13 occupy the area of ​​the central hole 1290° central angle.

[0036] The rear part of the core rod 3 is provided with several dose retaining rings, such as Figures 4-7 As shown, each dose retainer includes a pair of radially symmetrical boss surfaces 33 and a pair of parallel end surfaces 32. Each boss surface 33 and each parallel end surface 32 occupies the area of ​​the central hole 1290° central angle. The inner diameter of the flat end surface 13 matches the outer diameter of the boss surface 33, and the inner diameter of the flat end surface 13 matches the outer diameter of the parallel end surface 32.

[0037] The inner diameter of the front part of the central hole 12 gradually decreases from front to back, and the thickness of the front part of the central hole 12 gradually decreases from the outside to the inside. The guide slope of the front part of the central hole 12 makes it easy for the boss surface 33 of the dose retainer to break through the flat end surface 13 of the central hole 12 when the core rod 3 is pulled back, while the boss surface 33 of the dose retainer is limited by the flat end surface 13 of the central hole 12 when the core rod 3 is pushed forward.

[0038] The rear part of the core rod 3 is provided with a first dose retaining ring 34 and a second dose retaining ring 35. When the first dose retaining ring 34 and the second dose retaining ring 35 are pulled to the center hole 12 of the buckle plate 1, the position of the core rod 3 can be adjusted by rotating or not rotating.

[0039] like Figure 4 and Figure 5 As shown, when the first dose retaining ring 34 and the second dose retaining ring 35 are pushed forward to the center hole 12, the core rod 3 can easily pass through when the parallel end face 32 of the first dose retaining ring 34 and the second dose retaining ring 35 are aligned with the flat end face 13 of the center hole 12.

[0040] like Figure 6 and Figure 7 As shown, when the boss surface 33 of the first dose retaining ring 34 and the second dose retaining ring 35 is aligned with the flat end surface 13 of the center hole 12 of the buckle plate 1, the core rod 3 is limited and cannot pass through.

[0041] The rear of the core rod 3 has a protruding hard retaining ring 31, and the rear of the inner side of the outer sleeve 2 has a hard stop buckle 25. The hard retaining ring 31 of the core rod 3 is interference-fitted into the outer sleeve 2, and the hard retaining ring 31 of the core rod 3 is pulled back to form a hard stop with the hard stop buckle 25 of the outer sleeve 2.

[0042] like Figure 8 and Figure 9As shown, the outer side of the outer jacket 2 is provided with a first dose mark 22 and a second dose mark 23. The first dose mark 22 and the second dose mark 23 can be arrows, dots or scale lines. The first dose mark 22 and the second dose mark 23 are arranged at intervals from front to back. When the front end of the first dose retaining ring 34 reaches the central hole 12, the first dose mark 22 is aligned with the front end of the piston 4. When the front end of the second dose retaining ring 35 reaches the central hole 12, the second dose mark 23 is aligned with the front end of the piston 4.

[0043] The first dose marker 22 and the second dose marker 23 are respectively marked with specific doses, which indicates to the operator that the syringe has injected the corresponding amount of liquid. One or more dose markers can be set according to the actual use.

[0044] This invention uses a buckle plate 1 fixed to the rolled edge of the syringe jacket 2. The buckle plate 1 has a central hole 12 for limiting passage. When the core rod 3 is pulled back to draw out the medicine, the core rod 3 retainer can easily pass over the buckle plate 1 of the jacket 2 through the guide slope on the front side of the central hole 12. At the same time, the position of the core rod 3 can be adjusted by rotating it, and the outline of the core rod 3 retainer can just pass through the central hole 12 of the buckle plate 1. At this time, the rotation adjustment angle of the core rod 3 corresponds to a high precision requirement.

[0045] When the syringe plunger 3 is used to inject the medication, the position of the plunger 3 can be adjusted by rotating it. The retaining ring of the plunger 3 is not likely to exceed the hard stop 25 of the outer sleeve 2. At this time, it is easier to adjust the angle of the plunger 3. This can indicate to the operator that a certain amount of liquid has been injected into the syringe, and that this dose is a specially set dose. There are arrows, dots or scale marks at this pause position to assist in the judgment.

[0046] If further injection is needed, rotate and adjust the position of the mandrel 3 to proceed with the next injection step.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A manually operated rotary precision syringe, comprising an outer casing and a plunger, wherein a needle tube is provided at the front end of the outer casing, a sheath is fitted over the outer side of the needle tube, the plunger is located inside the outer casing, a piston is provided at the front end of the plunger, and the outer casing includes a needle seat and a plunger sleeve, characterized in that, The back end of the jacket is provided with a buckle plate, which is fixedly connected to the back end of the jacket. The front end of the buckle plate is provided with a latch, and the back end of the jacket is provided with a lock hole. The latch is embedded in the lock hole, and the latch and the lock hole form a latching structure. The rear part of the core rod is provided with several dose retaining rings. Each dose retaining ring includes a pair of radially symmetrical boss surfaces and a pair of parallel end surfaces. The buckle plate is provided with a central hole through the front and rear. The rear end of the central hole includes a radially symmetrical flat end surface, an open end surface, and a pair of radially symmetrical flat end surfaces. The inner diameter of the flat end surface matches the outer diameter of the boss surface, and the inner diameter of the flat end surface matches the outer diameter of the parallel end surface. The inner diameter of the front part of the central hole gradually decreases from front to back, and the thickness of the front part of the central hole gradually decreases from the outside to the inside, so that when the core rod is pulled back, the boss surface of the dose retaining ring can easily break through the flat end face of the central hole, while when the core rod is pushed forward, the boss surface of the dose retaining ring is limited by the flat end face of the central hole. The rear part of the core rod is provided with a first dose retaining ring and a second dose retaining ring. When the first dose retaining ring and the second dose retaining ring are pulled back to the center hole of the buckle plate, the position of the core rod can be adjusted by rotating or not rotating. When the first and second dose retainers are pushed forward to the center hole, the core rod can easily pass through when the parallel end faces of the first and second dose retainers are aligned with the flat end face of the center hole. When the boss surfaces of the first and second dose retaining rings are aligned with the flat end face of the center hole of the buckle plate, the core rod is limited and cannot pass through.

2. The manual rotary precision injector according to claim 1, characterized in that, The rear of the core rod has a protruding hard retaining ring, and the rear of the inner side of the outer sleeve has a hard stop. When the core rod is pushed forward, the hard retaining ring is in an interference fit with the inner side of the outer sleeve, and when the core rod is pulled backward, the hard retaining ring and the hard stop of the outer sleeve are stopped.

3. The manual rotary precision injector according to claim 1, characterized in that, The outer side of the outer casing is provided with a first dose mark and a second dose mark, which are spaced apart from front to back. When the first dose retainer ring reaches the center hole, the first dose mark is aligned with the front end of the piston. When the second dose retainer ring reaches the center hole, the second dose mark is aligned with the front end of the piston.

4. The manual rotary precision injector according to claim 1, characterized in that, The central recess at the rear end of the needle hub has a cavity.

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