An elastic lock-type anti-reusable quantitative and micro-injection syringe

Abstract

The present invention belongs to the field of medical devices, and provides an elastic lock-type anti-reuse quantitative and micro-injection syringe, the purpose of which is to provide a syringe that can not only achieve one-time suction of liquid medicine, but also multi-point, micro-, precise quantitative injection for the same patient, and can prevent being reused. The main scheme includes an empty barrel (1-1), a rubber plug (8) arranged at the top of a core rod (9) in the empty barrel, a locking tooth arranged on the core rod (9), an outer sleeve (1-2) arranged in the opening direction of the empty barrel (1-1), a core rod locking structure arranged in the outer sleeve (1-2), and the core rod locking structure is locked with the locking tooth arranged on the core rod (9) by rotating the core rod locking structure, so that the core rod can only be pushed down and cannot be pulled up, and each time the core rod pushes a locking tooth, it is a point injection dose.

Description

Technical Field

[0001] The invention belongs to the field of medical devices and provides an elastic lock-type anti-reuse quantitative and micro-injector. Background Art

[0002] Public syringes can transmit diseases, so they must be sterilized. However, sterilization equipment is expensive and time-consuming, so this method has been basically eliminated and disposable syringes have come into being.

[0003] Disposable syringes have been widely used throughout the world for many years. The most commonly used ordinary disposable syringes in medical institutions are composed of a syringe, a needle, a piston and a core rod assembled in the syringe.

[0004] However, the injection dose of an ordinary syringe is usually a one-time dose, that is, the drug solution is drawn once and injected at one time. Even if the drug solution may be drawn once and injected in multiple times, the injection dose is only determined by the operator through the scale printed on the syringe barrel. The syringe scale itself has errors, so there will be scale errors and human errors. Therefore, the stability and accuracy of the injection dose cannot be guaranteed. With the continuous development of treatment methods and drug efficacy, some diseases require multi-point injection of drugs for the same patient, and require micro-injection at each point, and the injection dose at each point is accurate and the same. The current minimum capacity of ordinary syringes is 0.1mL, which cannot meet the requirements of multiple, micro, and accurate and fixed injection doses each time.

[0005] In addition, ordinary syringes cannot be destroyed after use, which may cause the risk of repeated use, and cross-infection of pathogens may cause life-threatening. Therefore, there is a need for a syringe that can simultaneously achieve one-time suction of liquid medicine, micro-injection of multiple points, precise quantitative injection of the same patient, and prevent secondary use. Summary of the invention

[0006] This structure can extract a sufficient amount of liquid medicine at one time, and then perform multi-point, trace, and precise quantitative injections on the patient in multiple times. The liquid medicine is extracted and exhausted by pushing and pulling the core rod, and the liquid medicine is injected by pressing the push tooth. The extraction speed is fast and the injection dosage is accurate. The locking tooth structure has higher precision and spring force is used to ensure the effectiveness of the operation. The core rod propulsion device and the locking structure core rod stop device are activated by rotating the button, which ensures that the liquid medicine can be extracted quickly and the core rod movement stroke can be controlled during injection, effectively solving the contradiction between fast extraction and quantitative injection. At the same time, the use of the locking tooth and stop tooth ensures the automatic destruction of the syringe to prevent secondary use.

[0007] The purpose of the present invention is to provide a syringe that can ensure that a syringe used for injection will not be reused to cause secondary infection, and can also ensure that the drug solution can be drawn once, and a syringe can be used for multi-point, trace, and precise quantitative injection on the same patient, thereby reducing the operator's operating difficulty and improving the uniformity of drug administration at each point.

[0008] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0009] An elastic lock-type anti-reusable quantitative and micro-injection syringe comprises an empty barrel, a rubber plug arranged at the top of a core rod in the empty barrel, a locking tooth arranged on the core rod, an outer sleeve arranged in the direction of the opening of the empty barrel, a core rod locking structure arranged in the outer sleeve, and the core rod locking structure is locked with the locking tooth arranged on the core rod by rotating the core rod locking structure. After locking, the core rod can only be pushed down but not pulled up.

[0010] In the above technical solution, the core rod locking structure includes a spring pull rod clamp and a fixed tooth locking structure and a push tooth locking structure arranged in the spring pull rod clamp, and a push tooth reset spring is arranged between the fixed tooth locking structure and the push tooth locking structure.

[0011] In the above technical solution, the spring pull rod card includes a first groove and a second groove formed on the spring pull rod card, and a limiting through hole groove is formed in the first groove and the second groove, and the limiting through hole groove includes a slide groove and a large end through hole.

[0012] In the above technical solution, the fixed tooth locking structure includes a fixed tooth and a fixed tooth positioning member, and the fixed tooth and the fixed tooth positioning member are assembled and arranged in the spring pull rod card.

[0013] In the above technical solution, the fixed tooth includes a fixed tooth base, a buckle rack mounting seat is arranged on the fixed tooth base, a buckle rack is arranged on the buckle rack mounting seat, a pull rod mounting through hole is arranged on the fixed tooth base, a fixed tooth spring pull rod is installed in the pull rod mounting through hole, and when the fixed tooth spring pull rod presses the buckle rack through the elastic force of the spring, the buckle rack and the locking teeth of the core rod are pressed and locked.

[0014] In the above technical solution, a limiting slide with large ends and a small middle is arranged on the fixed tooth spring pull rod, and the limiting slide slides in the slide groove of the limiting through hole groove. When the limiting slide slides to the large end through hole, it disengages from the limiting through hole groove.

[0015] In the above technical solution, a core rod limiting groove is also provided on the buckle rack mounting seat.

[0016] In the above technical solution, the push-tooth locking structure includes a push-tooth positioning device and a push-tooth. After the push-tooth positioning device and the push-tooth are assembled, they are arranged in the spring pull rod card.

[0017] In the above technical solution, a second buckle rack mounting seat is provided on the push-tooth base, a second buckle rack is provided on the second buckle rack mounting seat, a second pull rod mounting through hole is provided on the push-tooth base, a push-tooth spring pull rod is installed in the second pull rod mounting through hole, the push-tooth spring pull rod presses the second buckle rack through the elastic force of the spring, and the second buckle rack is pressed and locked with the locking teeth of the core rod.

[0018] In the above technical solution, a core rod limiting groove is also provided on the push tooth positioning.

[0019] In the above technical solution, the locking teeth include a check tooth and a one-way advancing tooth, wherein the check tooth and the one-way advancing tooth are both low at one end close to the plug and high at the other end to form a tooth. The check tooth is a small tooth and the one-way advancing tooth is a large tooth, which is related to the injection volume.

[0020] Because the present invention adopts the above technical solution, it has the following beneficial effects:

[0021] 1. The locking structure provided by the present invention is positioned by rotating the push-tooth. The push-tooth positioning drives the fixed tooth positioning to rotate through the limited core rod, thereby driving the fixed tooth spring pull rod and the push-tooth spring pull rod to slide in the slide groove of the limited through hole groove. When the limited slide slides to the large end through hole, it is disengaged from the limited through hole groove. Under the action of elastic force, the locking teeth of the buckle rack and the core rod are pressed and locked. Once the push-tooth positioning is rotated, the spring pull rod is disengaged from the limited through hole groove. Due to the action of the spring elastic force, the spring pull rod will no longer be able to return to the initial position. At this time, the push rod cannot be pulled up and can only be pushed down, ensuring that it will not be reused by others.

[0022] 2. The push rod of the present invention will be locked only after the hand is rotated. The push rod cannot be pulled up and can only be pushed down. When the push rod is pushed forward, the second rack is pushed forward by one click on the one-way pushing tooth to inject a dose at one point. In order to prevent the core rod of the syringe from following the one-way pushing tooth to reset and retreat during pushing, a check tooth is provided to ensure that the core rod of the syringe will not retreat when the one-way pushing tooth is reset.

[0023] The injection volume of the core rod pushed by the pusher tooth is the injection dose for one point, and the amount of liquid drawn at one time (syringe capacity) is several times the injection volume, thus achieving multi-point injection. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is an exploded view of the structure of the present invention;

[0025] Figure 2 This is a cross-sectional view of the spring tie rod card;

[0026] Figure 3 , Figure 4 , Figure 5 It is a partial cross-sectional view;

[0027] Figure 6It is a schematic diagram of the push gear structure;

[0028] Figure 7 It is a schematic diagram of the push gear positioning structure;

[0029] Figure 8 It is a schematic diagram of the fixed gear structure;

[0030] Fig. 9 It is a schematic diagram of the fixed gear positioning structure;

[0031] Fig.10 It is a partial cross-sectional view after assembly;

[0032] Fig.11 This is a cross-sectional view of the jacket;

[0033] Fig.12 It is a schematic diagram of the spring pull rod card structure;

[0034] Fig.13 It is a schematic diagram of the fixed tooth spring pull rod structure;

[0035] Fig.14 Schematic diagram of the core rod lock teeth.

[0036] 1-outer sleeve, 1-1-empty sleeve, 1-2-outer sleeve, 1-3-sleeve fixing seat, 2-spring pull rod card, 2-1-second groove, 2-2-limiting through hole groove, 2-3-first groove, 2-4-limiting head of spring pull rod card, 2-2-1-slide groove, 2-2-2-big head through hole, 3-fixed tooth, 3-1-pull rod installation through hole, 3-2-buckle rack, 3-3-fixed tooth pin, 3-4-fixed tooth Pin hole, 3-5-limiting groove, 3-6-fixed tooth base, 3-7-buckle rack mounting seat, 4-fixed tooth spring pull rod, 4-1-push tooth spring pull rod, 4-a-limiting slide, 5-fixed tooth spring, 5-1-push tooth spring, 6-push tooth reset spring, 7-push tooth positioning, 7-1-push tooth positioning pin hole, 7-2-push tooth positioning pin, 7-3-core rod limiting groove, 7-4-push tooth positioning protrusion, 8-rubber plug, 9-core rod, 9-1-limiting protrusion, 9-2-check tooth, 9-3-one-way propulsion tooth, 10-fixed tooth positioning, 11-push tooth, 11-1-second buckle rack, 11-3-through hole, 11-4-push tooth pin, 11-5-second pull rod mounting through hole, 11-6-push tooth pin hole, 11-7-push tooth base, 11-8-second buckle rack mounting seat. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] The present invention provides an elastic locking type anti-reuse quantitative and micro-injection syringe, comprising an empty barrel 1-1, a rubber plug 8 arranged at the top of a core rod 9 and located in the empty barrel, a locking tooth is arranged on the core rod 9, an outer sleeve 1-2 is arranged in the opening direction of the empty barrel 1-1, a core rod locking structure is arranged in the outer sleeve 1-2, and the core rod locking structure is locked with the locking tooth arranged on the core rod 9 by rotating the core rod locking structure. The core rod locking structure comprises a spring pull rod card 2 and a fixed tooth locking structure and a push tooth locking structure arranged in the spring pull rod card 2, a push tooth reset spring is arranged between the fixed tooth locking structure and the push tooth locking structure, and the function of the push tooth reset spring is to provide a thrust to both ends to ensure that the fixed tooth spring pull rod, the push tooth spring pull rod and the limit through hole groove have a certain friction force, and those skilled in the art should know that under the inspiration of the technical solution of this application, the push tooth reset spring can be replaced by other elastic materials.

[0039] In the above technical solution, the spring pull rod card 2 includes a first groove 2-4 and a second groove 2-1 opened on the spring pull rod card, and a limiting through hole groove 2-2 is opened in the first groove 2-4 and the second groove 2-1, and the limiting through hole groove 2-2 includes a slide groove 2-2-1 and a large head through hole 2-2-2.

[0040] In the above technical solution, the fixed tooth locking structure includes a fixed tooth 3 and a fixed tooth positioning 10. After the fixed tooth 3 and the fixed tooth positioning 10 are assembled, they are arranged in the spring pull rod card 2. Preferably, the present invention is assembled by setting a pin and a pin hole on the fixed tooth 3 and the fixed tooth positioning 10.

[0041] In the above technical scheme, the fixed tooth 3 includes a fixed tooth base 3-6, on which a buckle rack mounting seat 3-7 is arranged, on which a buckle rack 3-2 is arranged, and on the fixed tooth base 3-6 a pull rod mounting through hole 3-1 is arranged, in which a fixed tooth spring pull rod 4 is installed, and when the fixed tooth spring pull rod 4 presses the buckle rack 3-2 through the elastic force of the spring, the buckle rack 3-2 is pressed and locked with the locking teeth of the core rod 9.

[0042] In the above technical solution, a limiting slide 4-a with large ends and a small middle is provided on the fixed tooth spring pull rod 4. The limiting slide 4-a slides in the slide groove 2-2-1 of the limiting through hole groove 2-2. When the limiting slide 4-a slides to the large end through hole 2-2-2, it disengages from the limiting through hole groove 2-2.

[0043] In the above technical solution, a core rod limiting groove 3-5 is also provided on the buckle rack mounting seat 3-7.

[0044] In the above technical solution, the push-tooth locking structure comprises a push-tooth 11 and a push-tooth positioning member 7 . After being assembled, the push-tooth 11 and the push-tooth positioning member 7 are arranged in the spring pull rod clamp 2 .

[0045] In the above technical scheme, the push tooth 11 includes a push tooth base 11-7, a second buckle rack mounting seat 11-8 is arranged on the push tooth base, a second buckle rack 11-2 is arranged on the second buckle rack mounting seat 11-8, a second pull rod mounting through hole 11-5 is arranged on the push tooth base 11-7, a push tooth spring pull rod 4-1 is installed in the second pull rod mounting through hole 11-5, the push tooth spring pull rod 4-1 presses the second buckle rack 11-2 through the elastic force of the spring, and the second buckle rack 11-2 is pressed and locked with the locking teeth of the core rod 9.

[0046] In the above technical solution, a limiting groove 7 - 3 for the core rod 9 is also provided on the push-tooth positioning member 7 .

[0047] In the above technical solution, a limiting protrusion is arranged on the core rod, which cooperates with the core rod limiting groove, the limiting groove, etc. to ensure that the fixed tooth locking structure and the push tooth locking structure can rotate simultaneously during rotation.

[0048] Principle description:

[0049] The limiting slide of the spring pull rod card is limited by the limiting through hole grooves in the first and second grooves set on the spring pull rod card. At this time, the push-tooth spring pull rod 4 and the push-tooth spring pull rod will not press the buckle rack and the second buckle rack, and the locking teeth on the core rod will not lock with the buckle rack. At this time, the syringe can extract the liquid medicine and exhaust the gas normally. After the extraction and exhaust are completed, the push-tooth positioning is rotated. The push-tooth positioning drives the fixed tooth positioning to rotate through the limited core rod, thereby driving the fixed tooth spring pull rod and the push-tooth spring pull rod to slide in the slide groove of the limiting through hole groove. When the limiting slide slides to the large head through hole, it is separated from the limiting through hole groove. Under the action of elastic force, the buckle rack and the locking teeth of the core rod are pressed and locked. At this time, the push rod cannot be pulled up and can only be pushed down to ensure that it will not be reused by others, and each push of a unidirectional push tooth is a point injection dose.

[0050] Extended protection range: The outer jacket in this structure diagram does not have a needle. The reserved one is a 6:100 cone head that meets the requirements of GB1962.1 standard for use with finished injection needles. This structure can also use a 6:100 cone head that meets the requirements of GB1962.2 standard or directly bond the needle tip to the front end of the outer jacket.

Claims

1. An elastic locking type anti-reusable quantitative and micro-injection syringe, comprising an empty barrel (1-1), a rubber plug (8) arranged at the top end of a core rod (9) and located inside the empty barrel, characterized in that: The core rod (9) is provided with locking teeth, an outer sleeve (1-2) is provided in the opening direction of the empty cylinder (1-1), and a core rod locking structure is provided inside the outer sleeve (1-2). The core rod locking structure is locked with the locking teeth provided on the core rod (9) by rotating the core rod locking structure. After locking, the core rod (9) can only be pushed downwards and cannot be pulled upwards. The core rod locking structure comprises a spring pull rod clamp (2) and a fixed tooth locking structure and a push tooth locking structure arranged in the spring pull rod clamp (2), and a push tooth reset spring (6) is arranged between the fixed tooth locking structure and the push tooth locking structure; The spring pull rod clamp (2) comprises a first groove (2-3) and a second groove (2-1) formed on the spring pull rod clamp, and a position-limiting through hole groove (2-2) is formed in the first groove (2-3) and the second groove (2-1), and the position-limiting through hole groove (2-2) comprises a sliding groove (2-2-1) and a large-end through hole (2-2-2); The fixed tooth locking structure comprises a fixed tooth (3) and a fixed tooth positioning member (10); after the fixed tooth (3) and the fixed tooth positioning member (10) are assembled, they are arranged in the spring pull rod clamp (2); The fixed tooth (3) comprises a fixed tooth base (3-6), a buckle rack mounting seat (3-7) is arranged on the fixed tooth base (3-6), a buckle rack (3-2) is arranged on the buckle rack mounting seat (3-7), a pull rod mounting through hole (3-1) is arranged on the fixed tooth base (3-6), a fixed tooth spring pull rod (4) is installed in the pull rod mounting through hole (3-1), and when the fixed tooth spring pull rod (4) presses the buckle rack (3-2) by the elastic force of the spring, the buckle rack (3-2) and the locking teeth of the core rod (9) are pressed and locked; A limiting slide (4-a) with large ends and a small middle is provided on the fixed tooth spring pull rod (4); the limiting slide (4-a) slides in a slide groove (2-2-1) of the limiting through hole groove (2-2); when the limiting slide (4-a) slides to the large end through hole (2-2-2), it disengages from the limiting through hole groove (2-2); A limit groove (3-5) is also provided on the buckle rack mounting seat (3-7); The push-tooth locking structure comprises a push-tooth positioning device (7) and a push-tooth (11), and the push-tooth positioning device (7) and the push-tooth (11) are arranged in the spring pull rod clamp (2) after being assembled; The push tooth (11) comprises a push tooth base (11-7), a second buckle rack mounting seat (11-8) is arranged on the push tooth base, a second buckle rack (11-2) is arranged on the second buckle rack mounting seat (11-8), a second pull rod mounting through hole (11-5) is arranged on the push tooth base (11-7), a push tooth spring pull rod (4-1) is installed in the second pull rod mounting through hole (11-5), the push tooth spring pull rod (4-1) presses the second buckle rack (11-2) by the elastic force of the spring, and the second buckle rack (11-2) is pressed and locked with the locking teeth of the core rod (9); A core rod limiting groove (7-3) is also provided on the push tooth positioning (7).

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