Disposable self-destructing syringe

Abstract

The invention relates to the technical field of syringes, in particular to a disposable self-destructive syringe, comprising a syringe, a core rod, a piston and a needle, wherein the piston is slidably arranged in an injection cavity, a limiting groove is recessed on the outer circumferential surface of the piston, a limiting strip matching the limiting groove is protruded on the inner wall of the injection cavity, the limiting strip is located in the limiting groove, a concave cavity is downwardly opened on the upper end surface of the piston, the core rod is threadedly connected with the concave cavity of the piston, a channel opening upward is provided in the core rod, and a conical tip is provided at the bottom end of the core rod. The invention ingeniously utilizes the cooperation of the limiting groove and the limiting strip to position the piston circumferentially in the injection cavity, and is combined with the core rod and the piston threaded connection, so that on the one hand, the piston and the core rod can be fixedly connected, and on the other hand, after the syringe is used, only the core rod needs to be rotated, so that the conical tip on the core rod can puncture the puncture part on the piston, so that the syringe is self-destructed and the syringe is prevented from being reused, and the invention has a simple structure and convenient operation.

Description

Technical Field

[0001] The invention relates to the technical field of syringes, in particular to a disposable self-destructive syringe. Background Art

[0002] A syringe is a widely used medical device used for subcutaneous injections, intramuscular injections and intravenous injections. The structure of a traditional syringe is mainly composed of a syringe, a piston, a core rod and a needle. When in use, the core rod is pushed and the piston on the core rod is used to eject the liquid in the syringe from the needle. Currently, syringes can be used again after being used once. After medical staff discard a used syringe, it is easy for criminals to pick it up and reuse it, which can easily lead to cross infection, especially the spread of hepatitis and AIDS. Summary of the invention

[0003] The technical problem to be solved by the present invention is: in order to solve the problem in the prior art that syringes are easily picked up and reused by lawless elements after being discarded, a disposable self-destructive syringe is provided.

[0004] The technical solution adopted by the present invention to solve its technical problems is: a disposable self-destructive syringe, comprising a syringe, a core rod, a piston and a needle, the needle being fixed at the bottom end of the syringe, the top end of the syringe being provided with an injection cavity opening upward, the injection cavity being communicated with the needle, the piston being slidably arranged in the injection cavity, the outer peripheral surface of the piston being provided with a recessed limiting groove, the inner wall of the injection cavity being provided with a limiting strip matching the limiting groove, the limiting strip being located in the limiting groove, the upper end surface of the piston being provided with a concave cavity downwardly, the portion of the piston between the cavity bottom of the concave cavity and the lower end surface of the piston being a puncturing portion, the core rod being threadedly connected to the concave cavity of the piston, the core rod being provided with a channel opening upwardly, the channel being communicated with the concave cavity, and the bottom end of the core rod being provided with a conical tip.

[0005] The present invention cleverly utilizes the cooperation of the limiting groove and the limiting strip to position the piston circumferentially in the injection cavity, and combines the core rod with the piston threaded connection. On the one hand, it can realize the fixed connection between the piston and the core rod. On the other hand, after the syringe is used, only the core rod needs to be rotated, and the puncture part on the piston can be punctured by the conical tip on the core rod, so that the syringe is self-destructed and the syringe is prevented from being reused. The structure is simple and the operation is convenient.

[0006] Further, an upper pressure ring and a lower pressure ring are respectively provided at the upper and lower ends of the piston, the upper pressure ring contacts the upper end surface of the piston, a connecting ring extends downward from the middle portion of the upper pressure ring, the outer peripheral surface of the connecting ring contacts the inner wall of the concave cavity, and the core rod is threadedly connected to the inner peripheral surface of the connecting ring;

[0007] The lower pressure ring contacts the lower end surface of the piston, and a connecting rod extends upward from the lower pressure ring. The connecting rod passes through the piston and the upper pressure ring in sequence. A nut is threadedly connected to the connecting rod, and the lower end surface of the nut contacts the upper end surface of the upper pressure ring. The inner hole of the lower pressure ring faces the punctured portion of the piston.

[0008] Furthermore, a conducting hole communicating with the channel is formed on the outer wall of the conical tip, and the conducting hole is communicated with the concave cavity.

[0009] The beneficial effects of the present invention are as follows: the disposable self-destructive syringe of the present invention cleverly utilizes the cooperation of the limiting groove and the limiting strip to position the piston circumferentially in the injection cavity, and is combined with the threaded connection between the core rod and the piston. On the one hand, the fixed connection between the piston and the core rod can be realized; on the other hand, after the syringe is used, only the core rod needs to be rotated, and the puncture part on the piston can be punctured by the conical tip on the core rod, so that the syringe is self-destructed and the syringe is prevented from being reused. The structure is simple and the operation is convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0011] Figure 1 is a schematic diagram of a disposable self-destructive syringe of the present invention;

[0012] Figure 2 yes Figure 1 A is a partial enlarged schematic diagram;

[0013] Figure 3 yes Figure 1 A partial enlarged schematic diagram of B in the figure.

[0014] In the figure: 1, syringe, 1-1, injection cavity, 1-11, limit strip, 2, core rod, 2-1, channel, 2-2, conical tip, 2-3, guide hole, 3, piston, 3-1, limit groove, 3-2, concave cavity, 3-3, puncture part, 4, needle, 5, upper pressure ring, 5-1, connecting ring, 6, lower pressure ring, 6-1, connecting rod, 6-2, nut, 6-3, inner hole. DETAILED DESCRIPTION

[0015] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams that only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention, and directions and references (e.g., up, down, left, right, etc.) may only be used to help describe the features in the drawings. Therefore, the following specific embodiments are not to be taken in a limiting sense, and the scope of the subject matter claimed is limited only by the attached claims and their equivalents.

[0016] Example 1

[0017] like Figure 1-3 As shown, a disposable self-destructive syringe comprises a syringe 1, a core rod 2, a piston 3 and a needle 4. The needle 4 is fixed at the bottom end of the syringe 1. The top end of the syringe 1 has an injection cavity 1-1 opening upward. The injection cavity 1-1 is connected to the needle 4. The piston 3 is slidably arranged in the injection cavity 1-1. The outer peripheral surface of the piston 3 is concave with a limiting groove 3-1. The inner wall of the injection cavity 1-1 protrudes with a limiting groove matching the limiting groove 3-1. The limiting strip 1-11 is located in the limiting groove 3-1, a concave cavity 3-2 is downwardly opened on the upper end surface of the piston 3, a portion of the piston 3 between the bottom of the concave cavity 3-2 and the lower end surface of the piston 3 is a puncturing portion 3-3, the core rod 2 is threadedly connected with the concave cavity 3-2 of the piston 3, the core rod 2 has a channel 2-1 opening upward, the channel 2-1 is connected with the concave cavity 3-2, and the bottom end of the core rod 2 has a conical tip 2-2.

[0018] Furthermore, an upper pressure ring 5 and a lower pressure ring 6 are respectively provided at the upper and lower ends of the piston 3, the upper pressure ring 5 is in contact with the upper end surface of the piston 3, a connecting ring 5-1 is extended downward from the middle part of the upper pressure ring 5, the outer peripheral surface of the connecting ring 5-1 is in contact with the inner wall of the concave cavity 3-2, and the core rod 2 is threadedly connected to the inner peripheral surface of the connecting ring 5-1;

[0019] The lower pressure ring 6 contacts with the lower end surface of the piston 3, and the lower pressure ring 6 has a connecting rod 6-1 extending upward, and the connecting rod 6-1 passes through the piston 3 and the upper pressure ring 5 in sequence. A nut 6-2 is threadedly connected to the connecting rod 6-1, and the lower end surface of the nut 6-2 contacts with the upper end surface of the upper pressure ring 5. The inner hole 6-3 of the lower pressure ring 6 is opposite to the puncture part 3-3 of the piston 3; when the nut 6-2 is tightened, the piston 3 can be clamped by the upper pressure ring 5 and the lower pressure ring 6, so as to improve the strength of the piston 3 and make it less likely to deform, and the outer peripheral surface of the piston 3 can be arched outward, so as to form a reliable seal with the inner wall of the injection cavity 1-1, and the connecting ring 5-1 in the concave cavity 3-2 is threadedly connected with the core rod 2 to ensure that when the core rod 2 rotates, the core rod 2 can move downward to puncture the puncture part 3-3 of the piston 3.

[0020] A conducting hole 2-3 communicating with the channel 2-1 is formed on the outer wall of the conical tip 2-2, and the conducting hole 2-3 is communicated with the concave cavity 3-2.

[0021] The working principle of the disposable self-destructive syringe of this embodiment is as follows:

[0022] With the cooperation of the limiting groove 3-1 and the limiting strip 1-11 in the injection chamber 1-1, the piston 3 can only reciprocate along its axial direction, so that when the core rod 2 is rotated, the piston 3 will not rotate with the core rod 2. Therefore, after the syringe is used, by rotating the core rod 2, the core rod 2 can be moved down to the conical tip 2-2 to puncture the weak puncture part 3-3 on the piston 3, and then the part of the injection chamber 1-1 located below the piston 3 will be connected with the concave cavity 3-2, and connected with the outside world through the conducting hole 2-3 and the channel 2-1 on the core rod 2, thereby realizing the self-destruction of the syringe, and effectively preventing the syringe from being picked up and reused.

[0023] The above-mentioned ideal embodiments of the present invention are for inspiration. Through the above-mentioned description, relevant staff can make various changes and modifications without departing from the technical idea of ​​the present invention. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A disposable self-destructive syringe, comprising a syringe (1), a core rod (2), a piston (3) and a needle (4), wherein the needle (4) is fixed to the bottom end of the syringe (1), and the top end of the syringe (1) is provided with an injection cavity (1-1) opening upward, wherein the injection cavity (1-1) is communicated with the needle (4), and characterized in that: The piston (3) is slidably arranged in the injection cavity (1-1); a limiting groove (3-1) is recessed on the outer circumferential surface of the piston (3); a limiting strip (1-11) matching the limiting groove (3-1) is protruded on the inner wall of the injection cavity (1-1); the limiting strip (1-11) is located in the limiting groove (3-1); a concave cavity (3-2) is opened downward on the upper end surface of the piston (3); a portion of the piston (3) located between the cavity bottom of the concave cavity (3-2) and the lower end surface of the piston (3) is a piercing portion (3-3); the core rod (2) is threadedly connected to the concave cavity (3-2) of the piston (3); a channel (2-1) opening upward is provided in the core rod (2); the channel (2-1) is communicated with the concave cavity (3-2); and the bottom end of the core rod (2) has a conical tip (2-2); An upper pressure ring (5) and a lower pressure ring (6) are respectively provided at the upper and lower ends of the piston (3); the upper pressure ring (5) contacts the upper end surface of the piston (3); a connecting ring (5-1) extends downward from the middle portion of the upper pressure ring (5); the outer peripheral surface of the connecting ring (5-1) contacts the inner wall of the concave cavity (3-2); and the core rod (2) is threadedly connected to the inner peripheral surface of the connecting ring (5-1); The lower pressure ring (6) contacts the lower end surface of the piston (3); a connecting rod (6-1) extends upward from the lower pressure ring (6); the connecting rod (6-1) passes through the piston (3) and the upper pressure ring (5) in sequence; a nut (6-2) is threadedly connected to the connecting rod (6-1); the lower end surface of the nut (6-2) contacts the upper end surface of the upper pressure ring (5); the inner hole (6-3) of the lower pressure ring (6) and the piercing portion (3-3) of the piston (3) are opposite; and in the longitudinal section of the piston (3), the width of the piercing portion (3-3) is greater than the width of the inner hole (6-3); The upper pressure ring (5) and the lower pressure ring (6) clamp the piston (3) so that the outer circumference of the piston (3) arches outward; when the core rod (2) rotates, the core rod (2) can move downward to puncture the puncturing portion (3-3) of the piston (3).

2. The disposable self-destructive syringe according to claim 1, characterized in that: A conducting hole (2-3) communicating with the channel (2-1) is provided on the outer wall of the conical tip (2-2), and the conducting hole (2-3) is communicated with the concave cavity (3-2).

Images