Safety injector

Abstract

The utility model relates to the technical field of injectors, in particular to a safety injector. The utility model provides a safety type syringe which comprises a needle cylinder used for containing liquid medicine, a core rod concentric with the needle cylinder is arranged in the needle cylinder, a piston is clamped to the end of the core rod, a needle head detachably connected with the needle cylinder is further arranged at one end of the needle cylinder, and a protective cover capable of protecting and shielding the needle head is arranged outside the needle cylinder. The normal injection or extraction operation is not influenced by the protective kit; due to the fact that the syringe is provided with the protective sleeve part, the needle head can be protected and shielded through the protective sleeve part, normal injection or extraction operation of the needle head cannot be affected, and the problem that in the prior art, the needle head of a syringe is fixedly arranged at the end of a needle cylinder, although a detachable needle sleeve is arranged for physical protection, the needle head cannot be damaged is solved. However, in the process from taking down the needle sleeve to injection, the needle head is still easy to accidentally injure other people due to the sharp needle head.

Description

Technical Field

[0001] The present application relates to the technical field of syringes, and in particular to a safety syringe. Background Art

[0002] A syringe is a common medical device consisting of a syringe with a small hole at the front end and a matching piston core rod. It is usually connected to a hypodermic needle and is used to inject liquid or gas into or extract it from body tissues.

[0003] In the prior art, the needle is usually arranged at the end of the syringe. Since the end of the needle is relatively sharp, in order to avoid accidental injury to others, a needle cover is usually used for protection. However, during the process of absorbing the drug solution and before injection, the needle cover needs to be removed, so that the needle is exposed to the outside, which makes it easy to accidentally injure others again in the period before injection. Utility Model Content

[0004] The problem to be solved by the present application is that the needle of the existing syringe is fixedly arranged at the end of the syringe barrel. Although it has a detachable needle cover for physical protection, the needle is still easy to accidentally injure others during the process of removing the needle cover and before injection due to its sharpness.

[0005] In order to solve the above-mentioned technical problems, the present application provides a safety syringe, comprising a syringe for containing a medicinal solution, a core rod arranged concentrically therewith is arranged inside the syringe, a piston is clamped at the end of the core rod, and a needle detachably connected thereto is arranged at one end of the syringe, and a protective kit is provided on the outside of the syringe which can protect and shield the needle without affecting its normal injection or extraction operations.

[0006] Since the syringe of the present application is designed with a protective kit, the protective kit can be used to protect and shield the needle without affecting the normal injection or withdrawal operation of the needle, thereby solving the problem that the needle of the syringe in the prior art is fixedly set at the end of the syringe barrel, and although there is a detachable needle cover for physical protection, the needle is still easy to accidentally injure others during the process from removing the needle cover to before injection due to its sharpness. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a schematic diagram of the three-dimensional structure of an embodiment.

[0008] Figure 2 It is a front view structural schematic diagram of an embodiment.

[0009] Figure 3 It is a schematic diagram of the structure of the groove and spring.

[0010] Figure 4It is a structural schematic diagram of a fixed sleeve, a movable sleeve and a spring.

[0011] Figure 5 It is a schematic diagram of the structure of the expansion piece and the gap.

[0012] Figure 6 It is a structural diagram of the core rod, piston and syringe.

[0013] Figure 7 A schematic diagram of the channel structure.

[0014] In the figure: 1, end cap; 2, fixed sleeve; 3, movable sleeve; 4, needle; 5, groove; 6, spring; 7, expansion plate; 8, notch; 9, core rod; 10, piston; 11, syringe; 12, channel. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application. Example

[0016] The present application relates to a safety syringe, such as Figure 1-7 As shown, the syringe includes a syringe 11 for containing liquid medicine, and a core rod 9 is arranged concentrically therewith inside the syringe 11. In order to realize the operation of delivering liquid medicine, a piston 10 is clamped at the end of the core rod 9, so that the core rod 9 forms a reciprocating sliding connection with the inner wall of the syringe 11 by means of the piston 10. In order to facilitate the injection of liquid medicine or puncture biopsy, a needle 4 detachably connected thereto is further arranged at one end of the syringe 11. In order to improve the safety of the needle 4 during use, a protective kit is added to the outside of the syringe 11, which can protect and shield the needle 4 without affecting its normal injection or extraction operation. With the help of the arrangement of the protective kit, the needle 4 can effectively avoid accidentally injuring others.

[0017] The protective set includes a fixed sleeve 2 and a movable sleeve 3. The fixed sleeve 2 is sleeved on the outside of the syringe 11 and one end thereof abuts against it, while the movable sleeve 3 is sleeved between the syringe 11 and the fixed sleeve 2 and can slide back and forth along the inner wall of the fixed sleeve 2.

[0018] In order to realize the self-recovery operation of the movable sleeve 3 after extension and retraction, a spring 6 for elastic contraction is added between the fixed sleeve 2 and the movable sleeve 3. With the help of the elastic force of the spring 6, when the movable sleeve 3 is squeezed and contracted by external force, the spring 6 begins to be compressed and accumulate force. When the movable sleeve 3 loses the external force, the spring 6 with accumulated force will start to drive the movable sleeve 3 to perform the reset movement operation.

[0019] In order to facilitate the loading and unloading operations of the fixed sleeve 2 and the movable sleeve 3, a plurality of outwardly expanding expansion plates 7 are arranged at one end of the movable sleeve 3 connected to the fixed sleeve 2, and gaps 8 for providing deformation space are formed between the expansion plates 7. Under normal conditions, the outer diameter of the expansion plates 7 is larger than the end opening diameter of the fixed sleeve 2, so that the movable sleeve 3 cannot be pulled out along the axial direction of the fixed sleeve 2 under normal conditions. When the expansion plates 7 are pressed, the outer diameter of the expansion plates 7 becomes smaller than the end opening diameter of the fixed sleeve 2, and the movable sleeve 3 can be pulled out along the axial direction of the fixed sleeve 2. The installation and disassembly of the movable sleeve 3 and the fixed sleeve 2 are the same.

[0020] In order to prevent the syringe from being reused, an inwardly recessed groove 5 is formed at one end of the fixing sleeve 2, and an end cap 1 matching the groove 5 is formed at one end of the core rod 9, so that when the end cap 1 completely enters the groove 5, the core rod 9 cannot be pulled out again.

[0021] In order to further prevent the core rod 9 from being pulled out, a channel 12 connected to the outside is provided at the center position of the core rod 9 in the axial direction, so that the external air can enter the syringe 11 along the channel 12 and act on one side of the piston 10, thereby hindering the withdrawal operation of the piston 10 by means of air pressure. When the liquid is absorbed for the first time, there is an appropriate pullable distance space between the end cap 1 and the groove 5. The core rod 9 can be pulled out by covering the channel 12 with the thumb, and then pulling the end cap 1 outward with the index finger and the middle finger.

[0022] During use, when taking liquid, first make one end of the movable sleeve 3 abut against the surface of the medicine bottle, then slowly press down, so that the spring 6 is compressed and contracted, and the movable sleeve 3 is gradually retracted into the fixed sleeve 2, and then the needle 4 can penetrate into the medicine bottle, and then by pulling the end cap 1 and using the thumb to make the channel 12 equal, the piston 10 can be pulled outward along the inside of the syringe 11 with the help of the core rod 9, and as the piston 10 is pulled, the medicine liquid can be drawn into the syringe 11, and then the movable sleeve 3 is separated from the medicine bottle, and the movable sleeve 3 will realize the reset movement under the action of the spring 6, and continue to perform the protection operation on the needle 4, and when the injection is completed, the end cap 1 is pushed into the groove 5 to avoid repeated use of the syringe.

[0023] It is to be understood that the present application is described by some embodiments, and it is known to those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present application. In addition, under the guidance of the present application, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present application. Therefore, the present application is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of the present application are within the scope protected by the present application.

Claims

1. A safety syringe, comprising a syringe (11) for containing a liquid medicine, characterized in that: A core rod (9) arranged concentrically therewith is arranged inside the syringe (11), and a piston (10) is clamped at the end of the core rod (9). A needle (4) detachably connected thereto is also arranged at one end of the syringe (11), and a protective kit is arranged outside the syringe (11) that can protect and shield the needle (4) without affecting its normal injection or extraction operation.

2. The safety syringe according to claim 1, characterized in that: The protective set comprises a fixed sleeve (2) and a movable sleeve (3); the fixed sleeve (2) is sleeved on the outside of the syringe (11) and one end thereof abuts against the syringe; the movable sleeve (3) is sleeved between the syringe (11) and the fixed sleeve (2) and is capable of reciprocating sliding motion along the inner wall of the fixed sleeve (2).

3. The safety syringe according to claim 2, characterized in that: A spring (6) for elastic contraction is arranged between the fixed sleeve (2) and the movable sleeve (3).

4. The safety syringe according to claim 2, characterized in that: A plurality of outwardly extending expansion pieces (7) are arranged at one end of the movable sleeve (3) connected to the fixed sleeve (2), and gaps (8) for providing deformation spaces are formed between the expansion pieces (7).

5. The safety syringe according to claim 4, characterized in that: The outer diameter of the expansion piece (7) is larger than the end opening diameter of the fixed sleeve (2) in a normal state.

6. The safety syringe according to claim 2, characterized in that: One end of the fixing sleeve (2) is formed with an inwardly recessed groove (5), and one end of the core rod (9) is formed with an end cap (1) matched with the groove (5).

7. The safety syringe according to claim 1, characterized in that: A channel (12) communicating with the outside is provided at the center position in the axial direction of the core rod (9).

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