Disposable syringe with self-destruction device

Abstract

The disposable syringe with the self-destruction device comprises a needle cylinder, the top of the needle cylinder is fixedly connected with a limiting plate, a connecting piece is arranged at the lower end of the needle cylinder in a penetrating mode, a needle head is installed at the bottom of the connecting piece in a penetrating mode, the interior of the needle cylinder is movably connected with a needle rod, and the bottom of the needle rod is fixedly connected with a piston. And the lower end of the piston is fixedly connected with a magnetic attraction block I. According to the invention, a blocking head is magnetically attracted to the bottom of the needle rod, the blocking head can correspond to a cavity in the connecting piece, and rotating plates which elastically rotate are mounted at four ends of the blocking head, so that after the blocking head enters the connecting piece, the rotating plates are opened, and the blocking head cannot be recycled; when the upward pulling force is larger than the magnetic attraction force, the blocking head falls off and permanently falls into the connecting piece to complete blocking of the syringe, self-destruction operation of the syringe is achieved, repeated use is prevented, and medical infection risks and abuse are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of syringes, and in particular to a disposable syringe with a self-destruction device. Background Art

[0002] A syringe is a medical tool used for injecting or withdrawing liquids, mainly composed of a barrel (cylinder body), a piston (push rod), a rubber gasket (piston head), and a needle. Its working principle is to move the piston in the barrel manually or mechanically, and use negative pressure or positive pressure to achieve the extraction or injection of the liquid medicine. Syringes can be classified into medical syringes (such as subcutaneous, intramuscular, and intravenous injections), laboratory syringes (such as micro-sampling), and industrial syringes (such as glue filling) according to their uses. The materials are mostly made of medical-grade polypropylene (PP) or glass to ensure chemical stability and biocompatibility. Syringes are indispensable in the fields of vaccination, drug treatment, blood collection, etc. Their accuracy (such as the 0.01 mL scale of insulin syringes) and safety directly affect the medical effect. In recent years, intelligent syringes (such as electronic syringes with dose reminders) and environmentally friendly degradable syringes have become research hotspots.

[0003] The existing self-destruction technologies of disposable syringes have significant defects: First, traditional self-destruction structures mostly rely on single mechanical locking (such as ratchets or brittle connecting rods), which are prone to failure when the injection is not fully pushed in place or when there is a deliberate residue left by humans, and cannot completely prevent reuse by back-drawing; Second, conventional blocking designs only locally lock the barrel or the push rod, lacking physical blocking of the needle channel, and the remaining liquid medicine can still be redrawn by disassembling the needle; Third, most self-destruction devices do not have a protection against premature triggering. During the movement of the push rod, the self-destruction components are prone to premature action due to vibration or accidental touch, resulting in obstruction of normal injection; Fourth, most existing locking structures use rigid clamping. When applying reverse force, it is easy to unlock due to material fatigue or violent damage. For example, the locking function is lost after the teeth of the claw and the groove are worn; Fifth, there is a lack of a multi-linkage self-destruction mechanism. Some designs only block the movement of the push rod and ignore the needle passage. The syringe can still be disassembled and reassembled for abuse; Sixth, traditional blocking components (such as expanding rubber plugs) are greatly affected by environmental temperature and humidity and may shrink and fail under extreme conditions; Seventh, the self-destruction operation relies on manual triggering (such as pressing an extra protrusion), which has the risk of operation oversights, and the complex structure leads to high production costs and low yield rates. These problems together lead to serious deficiencies in the reliability of preventing reuse, the resistance to violent cracking, and the environmental adaptability of existing self-destruction syringes, making it difficult to meet the requirements of high-security medical scenarios. Summary of the Invention

[0004] (I) Technical Problems to be Solved

[0005] In view of the deficiencies of the prior art, the present invention provides a disposable syringe with a self-destruction device, which solves the problems that the existing disposable syringes with self-destruction devices have serious deficiencies in anti-reuse reliability, anti-violent cracking ability and environmental adaptability, and it is difficult to meet the requirements of high-security medical scenarios.

[0006] (II) Technical solution

[0007] To achieve the above objectives, the present invention is realized through the following technical solutions: A disposable syringe with a self-destruction device includes a syringe barrel. A limit plate is fixedly connected to the top of the syringe barrel. A connecting piece is penetrated and arranged at the lower end of the syringe barrel. A needle head is penetrated and installed at the bottom of the connecting piece. A plunger rod is movably connected inside the syringe barrel. A piston is fixedly connected to the bottom of the plunger rod. A magnetic attraction block one is fixedly connected to the lower end of the piston. A magnetic attraction block two is correspondingly arranged at the lower end of the magnetic attraction block one. A blocking head is fixedly connected to the bottom of the magnetic attraction block two;

[0008] Four ends on the outer side of the blocking head are provided with connecting grooves. Installation grooves are respectively arranged inside the connecting grooves. A spring two is fixedly connected inside the installation grooves. The other end of the spring two is fixedly connected to a rotating plate. A rotating shaft is rotatably connected inside the connecting grooves. The rotating plate is fixedly connected to the rotating shaft. A blocking ring is fixedly connected inside the connecting piece. The inner ring size of the blocking ring is the same as that of the blocking head. A connecting head is correspondingly installed at the top of the plunger rod.

[0009] Preferably, arc-shaped grooves are opened at both upper ends of the plunger rod. Arc-shaped plates are fixedly connected to both lower ends of the bottom of the connecting head. The arc-shaped plates correspond to the arc-shaped grooves.

[0010] Preferably, a limit groove is penetrated and opened at the top of the plunger rod. A limit block is fixedly connected to the middle part below the connecting head. The limit block corresponds to the limit groove.

[0011] Preferably, positioning holes are penetrated and opened inside the arc-shaped grooves and the limit grooves.

[0012] Preferably, fixing blocks are fixedly connected to both outer ends of the syringe barrel. A slot is opened inside the fixing blocks. A spring one is fixedly connected to the middle part of the inner side of the slot.

[0013] Preferably, the other end of the spring one is fixedly connected to a connecting plate. The other end of the connecting plate is fixedly connected to a positioning column, and the positioning column is penetrated and arranged inside the syringe barrel.

[0014] Preferably, the positioning column corresponds to the positioning hole. Slide rods are fixedly connected to both inner ends of the fixing blocks. The connecting plate is slidably connected to the slide rods.

[0015] Working principle: When in use, the staff member pulls up the needle rod 6. At this time, the blocking head 19 does not enter the inside of the connecting piece 2. During the process of pulling up the needle rod 6, the injection liquid can be pumped into the inside of the syringe barrel 1. When injection is required, the staff member aligns the connecting head 7 with the needle rod 6. The arc plate 8 enters the arc groove 9, and the limit block 12 enters the inside of the limit groove 11. Then the staff member presses down the needle rod 6. The needle rod 6 drives the piston 17 to move downward, thereby pushing the injection liquid outwards to complete the injection operation. After the injection is completed, the staff member pulls out the needle 3, and then continues to push the needle rod 6 inward, so that the piston 17 drives the blocking head 19 to enter the inside of the connecting piece 2. The four rotating plates 22 on the outside of the blocking head 19 can be retracted inward under the extrusion of the blocking ring 21, so that the blocking head 19 can smoothly enter the inside of the connecting piece 2. Then the staff member pulls up the needle rod 6. Since the cavity inside the connecting piece 2 is larger than the blocking head 19, the four rotating plates 22 on the outside of the blocking head 19 can pop outwards under the action of the second spring 23, so that the blocking head 19 can be stuck inside the connecting piece 2. Along with the upward pulling force, at this time the pulling force is greater than the suction force between the first magnetic attraction block 24 and the second magnetic attraction block 25, so that the blocking head 19 directly detaches from the piston 17 and drops into the inside of the connecting piece 2, achieving the effect of blocking the connecting piece 2 and realizing the self-destruction of the entire syringe;

[0016] Secondly, when the piston 17 reaches the bottommost position, the staff member directly pulls up the connecting head 7. At this time, the arc grooves 9 and the positioning holes 10 at both ends of the outside of the needle rod 6 are directly exposed. The internal needle rod 6 is slightly rotated so that the positioning holes 10 are aligned with the positioning posts 15. Under the action of the first spring 16, the positioning posts 15 can pop outwards, thereby completing the clamping with the positioning holes 10 and realizing the locking of the needle rod 6, so as to complete the double self-destruction of the entire syringe, greatly preventing repeated use, reducing the risk of medical infection and abuse problems.

[0017] (III) Beneficial effects

[0018] The present invention provides a disposable syringe with a self-destruction device. It has the following beneficial effects:

[0019] 1. In the present invention, the blocking head is magnetically attracted at the bottom of the needle rod. The blocking head can correspond to the cavity inside the connecting piece. Elastic rotating plates are installed at the four ends of the blocking head. When the blocking head enters the inside of the connecting piece, the rotating plates open so that the blocking head cannot be retracted. When the upward pulling force is greater than the magnetic attraction force, the blocking head falls off and permanently drops into the inside of the connecting piece to complete the blocking of the syringe, realizing its self-destruction operation, preventing repeated use, reducing the risk of medical infection and abuse.

[0020] 2. The present invention can make the arc-shaped groove and positioning hole provided on the needle rod correspond to the positioning components at both ends of the syringe barrel. During use, the connecting head can block the arc-shaped groove and the positioning hole, so that the positioning post cannot enter the positioning hole. After use, the connecting head is pulled out, the positioning hole is exposed, and the positioning post is ejected outward by the first spring and is engaged with the positioning hole, thereby locking the needle rod inside the syringe barrel and achieving the effect of double self-destruction. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is the front view of a disposable syringe with a self-destruction device proposed by the present invention;

[0022] Figure 2 is the installation schematic diagram of the connecting head of a disposable syringe with a self-destruction device proposed by the present invention;

[0023] Figure 3 is the internal schematic diagram of the fixed block of a disposable syringe with a self-destruction device proposed by the present invention;

[0024] Figure 4 is the schematic diagram of the blocking head of a disposable syringe with a self-destruction device proposed by the present invention;

[0025] Figure 5 is the schematic diagram of the magnetic attraction structure of a disposable syringe with a self-destruction device proposed by the present invention.

[0026] Among them, 1. Syringe barrel; 2. Connector; 3. Needle head; 4. Fixed block; 5. Limiting plate; 6. Needle rod; 7. Connecting head; 8. Arc-shaped plate; 9. Arc-shaped groove; 10. Positioning hole; 11. Limiting groove; 12. Limiting block; 13. Groove; 14. Slide rod; 15. Positioning post; 16. First spring; 17. Piston; 18. Connecting plate; 19. Blocking head; 20. Installation groove; 21. Blocking ring; 22. Rotating plate; 23. Second spring; 24. First magnetic attraction block; 25. Second magnetic attraction block; 26. Rotating shaft; 27. Connecting groove. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0028] Embodiment:

[0029] As Figures 1-5As shown in the figure, an embodiment of the present invention provides a disposable syringe with a self-destruction device, which includes a syringe barrel 1. A limiting plate 5 is fixedly connected to the top of the syringe barrel 1. A connecting piece 2 is disposed through the lower end of the syringe barrel 1. A needle head 3 is installed through the bottom of the connecting piece 2. A plunger rod 6 is movably connected inside the syringe barrel 1. A piston 17 is fixedly connected to the bottom of the plunger rod 6. A magnetic attraction block one 24 is fixedly connected to the lower end of the piston 17. A magnetic attraction block two 25 is correspondingly arranged below the magnetic attraction block one 24. A blocking head 19 is fixedly connected to the bottom of the magnetic attraction block two 25. The inside of the connecting piece 2 is a cavity structure and can correspond to the blocking head 19. The blocking ring 21 installed inside the connecting piece 2 can ensure that the inner hole thereof is the same size as the blocking head 19, so that the blocking head 19 can smoothly enter the inside of the connecting piece 2. After completely entering, the rotating plate 22 on the outside of the blocking head 19 can open to complete the clamping operation, achieving the self-destruction effect. The magnetic attraction block one 24 and the magnetic attraction block two 25 can connect the piston 17 and the blocking head 19 during use, preventing the blocking head 19 from directly falling on the upper end of the connecting piece 2 during use and blocking the injection port. In the subsequent self-destruction process, as long as the upward pulling force is greater than the magnetic attraction force between the two, the blocking head 19 can be detached to achieve the blocking effect;

[0030] Connection grooves 27 are opened at the four outer ends of the blocking head 19. Installation grooves 20 are respectively opened inside the connection grooves 27. A second spring 23 is fixedly connected inside the installation grooves 20. The other end of the second spring 23 is fixedly connected to a rotating plate 22. A rotating shaft 26 is rotatably connected inside the connection grooves 27. The rotating plate 22 is fixedly connected to the rotating shaft 26. A blocking ring 21 is fixedly connected inside the connecting piece 2. The inner ring size of the blocking ring 21 is the same as that of the blocking head 19. A connecting head 7 is correspondingly installed at the top of the plunger rod 6. The rotating plate 22 can be rotated through the rotating shaft 26. After the rotating plate 22 is completely retracted into the connection grooves 27, it can be flush with the end face of the blocking head 19 to ensure that it can smoothly enter the inside of the connecting piece 2 to complete the blocking operation;

[0031] Arc-shaped grooves 9 are opened at the upper two ends of the plunger rod 6. Arc-shaped plates 8 are fixedly connected to the bottom two ends of the connecting head 7. The arc-shaped plates 8 correspond to the arc-shaped grooves 9. A limiting groove 11 is penetrated and opened at the top of the plunger rod 6. A limiting block 12 is fixedly connected to the middle of the lower part of the connecting head 7. The limiting block 12 corresponds to the limiting groove 11. Positioning holes 10 are penetrated and opened inside the arc-shaped grooves 9 and the limiting grooves 11. A screw hole is provided at one end of the connecting head 7 away from the arc-shaped plate 8. The screw hole is matched with a bolt to lock the connecting head 7 on the plunger rod 6, ensuring the stability during the lifting process. When disassembling later, only the positioning bolt needs to be rotated in the reverse direction;

[0032] At both outer ends of the syringe barrel 1, there are fixedly connected fixing blocks 4. Inside the fixing blocks 4, there are slots 13. In the middle of the inner side of the slots 13, there is a fixedly connected first spring 16. The other end of the first spring 16 is fixedly connected to a connecting plate 18. The other end of the connecting plate 18 is fixedly connected to a positioning post 15, and the positioning post 15 penetrates through the syringe barrel 1. When the piston 17 reaches the bottommost position, the staff directly pulls up the connector 7. At this time, the arc-shaped grooves 9 and positioning holes 10 at both outer ends of the needle rod 6 are directly exposed. Slightly rotate the inner needle rod 6 to align the positioning hole 10 with the positioning post 15. Under the action of the first spring 16, the positioning post 15 can pop outwards, thus completing the clamping with the positioning hole 10 and realizing the locking of the needle rod 6, so as to complete the double self-destruction of the entire syringe, greatly preventing repeated use and reducing the problems of medical infection risk and abuse;

[0033] The positioning post 15 corresponds to the positioning hole 10. At both inner ends of the fixing block 4, there are fixedly connected sliding rods 14. The connecting plate 18 is slidably connected to the sliding rods 14. By providing the sliding rods 14, the connecting plate 18 and the positioning post 15 can be restricted to ensure the stability and locking effect of the positioning post 15 during the sliding process.

[0034] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirits of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A disposable syringe with a self-destruct device, comprising a syringe (1), characterized in that: The top of the syringe (1) is fixedly connected to a limit plate (5), the lower end of the syringe (1) is penetrated by a connecting piece (2), the bottom of the connecting piece (2) is penetrated by a needle head (3), the inside of the syringe (1) is movably connected to a needle rod (6), the bottom of the needle rod (6) is fixedly connected to a piston (17), the lower end of the piston (17) is fixedly connected to a magnetic block 1 (24), the lower end of the magnetic block 1 (24) is correspondingly provided with a magnetic block 2 (25), and the bottom of the magnetic block 2 (25) is fixedly connected to a blocking head (19); The four ends of the outer side of the blocking head (19) are provided with connecting grooves (27), and the interior of the connecting grooves (27) is provided with mounting grooves (20). The interior of the mounting grooves (20) is fixedly connected with a second spring (23), and the other end of the second spring (23) is fixedly connected with a rotating plate (22). The interior of the connecting grooves (27) is rotatably connected with a rotating shaft (26), and the rotating plate (22) is fixedly connected to the rotating shaft (26). The interior of the connecting member (2) is fixedly connected with a blocking ring (21), and the inner ring size of the blocking ring (21) is the same as that of the blocking head (19). A connecting head (7) is correspondingly installed at the top of the needle rod (6).

2. A disposable syringe with a self-destructing device according to claim 1, characterized in that: The upper two ends of the needle rod (6) are provided with arc-shaped grooves (9), and the lower two ends of the connector (7) are fixedly connected with arc-shaped plates (8), and the arc-shaped plates (8) correspond to the arc-shaped grooves (9).

3. A disposable syringe with a self-destructing device according to claim 1, characterized in that: A limiting groove (11) is formed through the top of the needle rod (6), and a limiting block (12) is fixedly connected to the middle portion below the connector (7), wherein the limiting block (12) corresponds to the limiting groove (11).

4. A disposable syringe with a self-destructing device according to claim 2 or 3, characterized in that: Positioning holes (10) are provided through the arc-shaped groove (9) and the limiting groove (11).

5. A disposable syringe with a self-destructing device according to claim 1, characterized in that: The two ends of the outer side of the syringe (1) are fixedly connected to a fixing block (4), a slot (13) is provided inside the fixing block (4), and a spring (16) is fixedly connected to the middle part of the inner side of the slot (13).

6. A disposable syringe with a self-destructing device according to claim 5, characterized in that: The other end of the spring 1 (16) is fixedly connected to a connecting plate (18), and the other end of the connecting plate (18) is fixedly connected to a positioning column (15), and the positioning column (15) is arranged to penetrate the interior of the syringe (1).

7. A disposable syringe with a self-destructing device according to claim 6, characterized in that: The positioning column (15) corresponds to the positioning hole (10), the inner two ends of the fixing block (4) are fixedly connected with sliding rods (14), and the connecting plate (18) is slidably connected to the sliding rods (14).

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