Explosion-proof plug type prefilled syringe and method for achieving safe sterilization thereof

Abstract

The present invention relates to the technical field of safe sterilization of syringes, in particular to explosion-proof plug type prefilled syringes and methods for safely sterilizing the same, including a protective pen barrel, a syringe assembly installed inside the protective pen barrel, a bottom injection port of the syringe assembly extending from the bottom tube mouth of the protective pen barrel, a tightening assembly installed on the outer wall of the syringe assembly, the tightening assembly being screwed and fastened to the outer wall of the protective pen barrel by external threads, two explosion-proof plug components being symmetrically and spaced apart above the tightening assembly, the upper ends of the explosion-proof plug components being detachably fixedly connected to the upper part of the syringe assembly. The explosion-proof plug type prefilled syringe can utilize the protective pen barrel to protect the internal syringe assembly when in use, and the protective pen barrel can also play a role of protection and limiting when performing explosion-proof plug experiments in the later stage, thereby improving the strength performance of the product.

Description

Technical Field

[0001] The present invention relates to the technical field of safe sterilization of syringes, and in particular to a prefilled syringe structure capable of safely preventing plug explosion and a method for safely sterilizing the syringe, especially a prefilled syringe with an anti-explosion plug and a method for safely sterilizing the syringe. Background Art

[0002] Syringes are mainly used to extract or inject gases or liquids with needles. They are also often used in medical devices, containers, and scientific instruments such as some chromatography to inject through rubber septa.

[0003] The structure of a traditional syringe consists of a syringe with a small hole at the front end and a matching piston core rod, which is used to inject a small amount of liquid or gas into areas that are inaccessible by other methods or to extract it from those places. When the core rod is pulled out, the liquid or gas is sucked in from the small hole at the front end of the syringe, and when the core rod is pushed in, the liquid or gas is squeezed out.

[0004] There are many different types of syringes, and pen syringes are one of the more common ones.

[0005] At present, pen-type syringes usually use glass bottles, and they are bottomless tube bottles, and the bottom is usually sealed with a piston. When the injection packaged in the glass bottle of the pen-type syringe is sterilized, the piston is easily pushed out of the glass bottle of the syringe. This phenomenon is usually called bursting.

[0006] The phenomenon of bursting will seriously affect the yield rate of pharmaceutical preparations. Bursting mainly occurs because at the end of sterilization, the temperature inside the glass bottle of the pen syringe is higher than the external temperature, so that the external pressure is lower than the internal pressure, resulting in a pressure difference between the inside and the outside. When the pressure difference is higher than the friction between the piston and the wall of the glass bottle of the pen syringe, the piston will be pushed out of the glass bottle of the pen syringe.

[0007] For example, in the patent document with patent application number CN202111582289.9, a piston for a pen-type syringe with an explosion-proof plug is disclosed, whose main structure includes a head and a tail structure. The piston head contains two sealing rings, and the piston tail contains a sealing ring; the piston head is made of brominated butyl rubber; the piston tail is made of polyisoprene rubber.

[0008] It can be seen from the contents recorded in the above-mentioned prior art patent that it mainly adds three sealing rings A\B\C to increase the probability of explosion-proof plugging. However, this prevention method obviously has certain defects and cannot effectively prevent the explosion-proof plugging phenomenon. It can only reduce the explosion-proof plugging phenomenon to a small extent.

[0009] To this end, the present invention optimizes the structure of the existing pen-type injector for the purpose of avoiding the bursting phenomenon, which is prone to occur during the sterilization operation, so as to better solve the problems existing in the prior art. Summary of the invention

[0010] The present invention solves one of the above-mentioned technical problems, and the technical solution adopted is: an explosion-proof plug type prefilled syringe, comprising a protective pen barrel, a syringe assembly is installed inside the protective pen barrel, the bottom injection port of the syringe assembly extends out from the bottom tube mouth of the protective pen barrel, a tightening assembly is installed on the outer side wall of the syringe assembly, the tightening assembly is screwed and fastened to the outer side wall of the protective pen barrel by external threads, two explosion-proof plug components are symmetrically and spaced apart above the tightening assembly, and the upper ends of the explosion-proof plug components are detachably fixedly connected to the upper part of the syringe assembly.

[0011] In any of the above schemes, it is preferred that the syringe assembly includes a glass syringe barrel coaxially installed in the central mounting cavity of the protective pen barrel, the bottom of the glass syringe barrel abuts the bottom of the central mounting cavity, the bottom injection port of the glass syringe barrel extends out from the bottom pipe mouth at the central mounting cavity, an explosion-proof piston is installed in the piston cavity of the glass syringe barrel, a plurality of piston sealing rings are arranged on the outer side wall of the explosion-proof piston, the outer side wall of each of the piston sealing rings is tightly sealed against the inner side wall of the piston cavity, a piston rod is fixedly installed at the top center of the explosion-proof piston, the top of the piston rod extends to the outside of the piston cavity and is fixedly connected to the bottom center of a pushing plate, and an attracting magnet ring is fixedly sleeved on the lower outer side wall of the pushing plate, and the bottom sides of the attracting magnet ring are respectively connected to the explosion-proof plug components at corresponding positions.

[0012] In any of the above schemes, preferably, the tightening assembly includes a connecting plate fixedly mounted on the upper outer wall of the glass syringe barrel, an internally threaded tube is integrally connected to the lower part of the connecting plate, an internal thread matching the external thread section of the upper outer wall of the protective pen barrel is provided on the inner side wall of the inner cavity of the internally threaded tube, and the bottom of the connecting plate is pressed against the top of the glass syringe barrel.

[0013] In any of the above schemes, it is preferred that the explosion-proof plug component includes a storage tube fixedly mounted on the top of the connecting disk outside the glass syringe barrel, and a corrosion-resistant steel wire rope for storing excessive outward extension of the piston rod is stored inside the storage cavity of the storage tube, the bottom of the corrosion-resistant steel wire rope is fixed to the bottom of the storage cavity, the top of the corrosion-resistant steel wire rope is movably extended to the upper part of the storage cavity and is fixedly connected to a strong magnetic column, and the top of the strong magnetic column is magnetically connected to the bottom of the magnet ring.

[0014] In any of the above schemes, it is preferred that a plurality of flexible support rings are fixedly installed at intervals from top to bottom on the inner side wall of the central mounting cavity of the protective pen barrel, and the inner ring side wall of each flexible support ring is tightly pressed against the outer side wall of the glass syringe barrel.

[0015] Preferably, in any of the above solutions, a lower magnet attracting ring is fixedly mounted on the top of each storage vertical cylinder.

[0016] The present invention also provides a method for achieving safe sterilization of an explosion-proof plug type prefilled syringe, comprising the following steps:

[0017] Disassemble the protective pen barrel, explosion-proof plug component, and syringe assembly of the explosion-proof plug type prefilled syringe one by one;

[0018] Take out each magnet ring and each explosion-proof plug component and sterilize them at high temperature for 5-10 minutes, and control the sterilization temperature to be 100℃-150℃;

[0019] Place the remaining parts of the explosion-proof plug prefilled syringe into a water bath and boil them in boiling water for 5-10 minutes;

[0020] The explosion-proof plug type prefilled syringe components that have been sterilized by high temperature baking and boiling water are sent together into the hot air drying chamber for drying by circulating hot air;

[0021] After the components are completely dried, the components are assembled to form an explosion-proof plug type prefilled syringe;

[0022] The assembled explosion-proof plug type prefilled syringe is sent into a high temperature chamber for a high temperature explosion-proof test. When the pressure inside the piston cavity increases due to the high temperature, the air pressure inside the piston cavity will push the explosion-proof piston outward.

[0023] When the explosion-proof piston is moved into place, the two explosion-proof plug components can limit the extension range and play the role of explosion-proof plugs.

[0024] In any of the above schemes, it is preferred that when circulating hot air drying is carried out inside the hot air drying chamber, ultraviolet irradiation is simultaneously configured inside the hot air drying chamber to achieve the purpose of sterilization.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. This explosion-proof plug prefilled syringe can use the protective pen barrel to protect the internal syringe components when in use. At the same time, the protective pen barrel can also play a protective and limiting role in the later explosion-proof plug test, thereby improving the strength performance of the product.

[0027] 2. The explosion-proof plug prefilled syringe can be directly sterilized as a whole in a high-temperature sterilization environment or can be decomposed and split to sterilize individual components. When performing overall sterilization and high-temperature explosion-proof plug experiments, the cooperation of the various explosion-proof plug components pre-installed in this application can achieve the limitation of the explosion-proof piston in response to the sudden increase of air pressure inside the piston cavity, effectively preventing the occurrence of explosion caused by excessive extension of the explosion-proof piston, and making disinfection and sterilization operations safer and more reliable.

[0028] 3. The explosion-proof plug adopts a magnetic positioning method, which can effectively ensure the stability of the magnetic attraction when the explosion-proof plug is installed, while ensuring the convenience during disassembly and the stability of the magnetic positioning when the explosion-proof piston is stored inward. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or components are generally identified by similar reference numerals. In the drawings, the elements or components are not necessarily drawn according to the actual scale.

[0030] Figure 1 It is a schematic structural diagram of the explosion-proof plug type prefilled syringe of the present invention.

[0031] Figure 2 It is a schematic diagram of the internal cross-sectional structure of the explosion-proof plug type prefilled syringe of the present invention.

[0032] In the figure, 1. protective pen holder; 2. bottom injection port; 3. bottom pipe mouth; 4. central mounting cavity; 5. glass syringe barrel; 6. piston cavity; 7. explosion-proof piston; 8. piston sealing ring; 9. piston rod; 10. push plate; 11. magnet ring; 12. connecting plate; 13. internal threaded tube; 14. storage vertical tube; 15. storage cavity; 16. corrosion-resistant steel wire rope; 17. strong magnetic column; 18. flexible support ring; 19. lower magnet ring. Implementation

[0033] The following is a detailed description of the embodiments of the technical solution of the present invention in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present invention. Figure 1-Figure 2 as shown in . Example

[0034] An explosion-proof plug type prefilled syringe comprises a protective pen barrel 1, a syringe assembly is installed inside the protective pen barrel 1, a bottom injection port 2 of the syringe assembly extends out from a bottom tube port 3 of the protective pen barrel 1, a tightening assembly is installed on the outer side wall of the syringe assembly, the tightening assembly is screwed and fastened to the outer side wall of the protective pen barrel 1 by external threads, two explosion-proof plug components are symmetrically and spaced apart above the tightening assembly, and the upper ends of the explosion-proof plug components are detachably fixedly connected to the upper part of the syringe assembly.

[0035] The explosion-proof plug type prefilled syringe adopts a protective structure of an external protective pen barrel 1, which can effectively ensure the safety and protection of the entire syringe when in use, avoid the fragility and explosion-proofness of the internal glass syringe barrel 5, and even if the glass syringe barrel 5 bursts, the protection of the protective pen barrel 1 can also play an effective protective role, preventing harm to the operator due to the explosion, and is safer and more reliable when used.

[0036] At the same time, the tightening assembly can ensure the firmness of the connection between the entire syringe assembly and the protective pen barrel 1. When the explosion-proof plug component is connected to the upper part of the syringe assembly, the stability of the entire structure during magnetic fixation can be ensured to prevent the occurrence of explosion plug phenomenon.

[0037] In any of the above schemes, it is preferred that the syringe assembly includes a glass syringe barrel 5 coaxially installed in the central mounting cavity 4 of the protective pen barrel 1, the bottom of the glass syringe barrel 5 abuts the bottom of the central mounting cavity 4, the bottom injection port of the glass syringe barrel 5 is extended from the bottom pipe mouth 3 at the central mounting cavity 4, and an explosion-proof piston 7 is installed in the piston cavity 6 of the glass syringe barrel 5, and a plurality of piston sealing rings 8 are arranged on the outer side wall of the explosion-proof piston 7, and the outer side wall of each of the piston sealing rings 8 is tightly sealed against the inner side wall of the piston cavity 6, and a piston rod 9 is fixedly installed at the top center of the explosion-proof piston 7, the top of the piston rod 9 extends to the outside of the piston cavity 6 and is fixedly connected to the bottom center of a push plate 10, and an attracting magnet ring 11 is fixedly sleeved on the lower outer side wall of the push plate 10, and the bottom sides of the attracting magnet ring 11 are respectively connected to the explosion-proof plug components at corresponding positions.

[0038] The syringe assembly relies on the main glass syringe barrel 5 to be installed inside the central mounting cavity 4, thereby realizing the center limit of the glass syringe barrel 5. In addition, the pushing plate 10 can be used to achieve pushing during injection. The magnet ring 11 fixed on the outer wall of the pushing plate 10 can effectively cooperate with the two explosion-proof plug components to achieve magnetic fixation, ensuring firmness during fixation and convenience during disassembly.

[0039] In any of the above schemes, it is preferred that the tightening assembly includes a connecting plate 12 fixedly mounted on the upper outer wall of the glass syringe barrel 5, and an internal threaded tube 13 is integrally connected to the lower part of the connecting plate 12, and the inner wall of the inner cavity of the internal threaded tube 13 is provided with an internal thread that matches the external thread section of the upper outer wall of the protective pen barrel 1, and the bottom of the connecting plate 12 is pressed against the top of the glass syringe barrel 5.

[0040] The tightening assembly relies on the connecting plate 12 and the internal threaded tube 13 fixedly bonded to the outside of the glass syringe barrel 5 to achieve threaded tightening with the outer wall of the protective pen barrel 1, thereby connecting the protective pen barrel 1 and the glass syringe barrel 5 as a relatively fixed whole. At the same time, the threaded screwing method can facilitate disassembly and installation.

[0041] In any of the above schemes, it is preferred that the explosion-proof plug component includes a storage stand 14 fixedly mounted on the top of the connecting disk 12 outside the glass syringe barrel 5, and a corrosion-resistant steel wire rope 16 for storing the excessive outward extension of the piston rod 9 is stored inside the storage cavity 15 of the storage stand 14. The bottom of the corrosion-resistant steel wire rope 16 is fixed to the bottom of the storage cavity 15, and the top movably extends to the upper part of the storage cavity 15 and is fixedly connected to a strong magnetic column 17. The top of the strong magnetic column 17 is magnetically connected to the bottom of the magnet ring 11.

[0042] When working, the explosion-proof plug component mainly relies on the corrosion-resistant steel wire rope 16 inside the storage cavity 15 of each storage cylinder 14 to achieve tensioning when outward pressure appears in the later stage, so as to prevent the explosion-proof piston 7 and the piston rod 9 from excessively shifting outward and avoid the explosion plug phenomenon.

[0043] When the syringe is used, each strong magnetic column 17 is first adsorbed and fixed on the bottom of the magnet ring 11, so that when the piston rod 9 drives the push plate 10 to move outward, the maximum outward movement range of the explosion-proof piston 7 can be limited to the maximum extent by the corrosion-resistant steel wire rope 16, ensuring that the explosion-proof piston 7 is telescopically displaced within the displacement range limited by the piston chamber 6, while preventing explosion.

[0044] In any of the above schemes, it is preferred that a plurality of flexible support rings 18 are fixedly installed at intervals from top to bottom on the inner wall of the central mounting cavity 4 of the protective pen barrel 1, and the inner ring side wall of each flexible support ring 18 is tightly pressed against the outer side wall of the glass syringe barrel 5.

[0045] Each flexible support ring 18 mainly serves to limit and fix the outer wall of the lower end of the glass syringe barrel 5 extending into the inner ring thereof in a circumferential direction, thereby effectively ensuring the stability of the glass syringe barrel 5 after installation and preventing it from shaking. Example

[0046] An explosion-proof plug type prefilled syringe comprises a protective pen barrel 1, a syringe assembly is installed inside the protective pen barrel 1, a bottom injection port 2 of the syringe assembly extends out from a bottom tube port 3 of the protective pen barrel 1, a tightening assembly is installed on the outer side wall of the syringe assembly, the tightening assembly is screwed and fastened to the outer side wall of the protective pen barrel 1 by external threads, two explosion-proof plug components are symmetrically and spaced apart above the tightening assembly, and the upper ends of the explosion-proof plug components are detachably fixedly connected to the upper part of the syringe assembly.

[0047] The explosion-proof plug type prefilled syringe adopts a protective structure of an external protective pen barrel 1, which can effectively ensure the safety and protection of the entire syringe when in use, avoid the fragility and explosion-proofness of the internal glass syringe barrel 5, and even if the glass syringe barrel 5 bursts, the protection of the protective pen barrel 1 can also play an effective protective role, preventing harm to the operator due to the explosion, and is safer and more reliable when used.

[0048] At the same time, the tightening assembly can ensure the firmness of the connection between the entire syringe assembly and the protective pen barrel 1. When the explosion-proof plug component is connected to the upper part of the syringe assembly, the stability of the entire structure during magnetic fixation can be ensured to prevent the occurrence of explosion plug phenomenon.

[0049] In any of the above schemes, it is preferred that the syringe assembly includes a glass syringe barrel 5 coaxially installed in the central mounting cavity 4 of the protective pen barrel 1, the bottom of the glass syringe barrel 5 abuts the bottom of the central mounting cavity 4, the bottom injection port 2 of the glass syringe barrel 5 is extended from the bottom pipe mouth 3 at the central mounting cavity 4, and an explosion-proof piston 7 is installed in the piston cavity 6 of the glass syringe barrel 5, and a plurality of piston sealing rings 8 are arranged on the outer side wall of the explosion-proof piston 7, and the outer side wall of each of the piston sealing rings 8 is tightly sealed against the inner side wall of the piston cavity 6, and a piston rod 9 is fixedly installed at the top center of the explosion-proof piston 7, the top of the piston rod 9 extends to the outside of the piston cavity 6 and is fixedly connected to the bottom center of a push plate 10, and an attracting magnet ring 11 is fixedly sleeved on the lower outer side wall of the push plate 10, and the bottom sides of the attracting magnet ring 11 are respectively connected to the explosion-proof plug components at corresponding positions.

[0050] The syringe assembly relies on the main glass syringe barrel 5 to be installed inside the central mounting cavity 4, thereby realizing the center limit of the glass syringe barrel 5. In addition, the pushing plate 10 can be used to achieve pushing during injection. The magnet ring 11 fixed on the outer wall of the pushing plate 10 can effectively cooperate with the two explosion-proof plug components to achieve magnetic fixation, ensuring firmness during fixation and convenience during disassembly.

[0051] In any of the above schemes, it is preferred that the tightening assembly includes a connecting plate 12 fixedly mounted on the upper outer wall of the glass syringe barrel 5, and an internal threaded tube 13 is integrally connected to the lower part of the connecting plate 12, and the inner wall of the inner cavity of the internal threaded tube 13 is provided with an internal thread that matches the external thread section of the upper outer wall of the protective pen barrel 1, and the bottom of the connecting plate 12 is pressed against the top of the glass syringe barrel 5.

[0052] The tightening assembly relies on the connecting plate 12 and the internal threaded tube 13 fixedly bonded to the outside of the glass syringe barrel 5 to achieve threaded tightening with the outer wall of the protective pen barrel 1, thereby connecting the protective pen barrel 1 and the glass syringe barrel 5 as a relatively fixed whole. At the same time, the threaded screwing method can facilitate disassembly and installation.

[0053] In any of the above schemes, it is preferred that the explosion-proof plug component includes a storage stand 14 fixedly mounted on the top of the connecting disk 12 outside the glass syringe barrel 5, and a corrosion-resistant steel wire rope 16 for storing the excessive outward extension of the piston rod 9 is stored inside the storage cavity 15 of the storage stand 14. The bottom of the corrosion-resistant steel wire rope 16 is fixed to the bottom of the storage cavity 15, and the top movably extends to the upper part of the storage cavity 15 and is fixedly connected to a strong magnetic column 17. The top of the strong magnetic column 17 is magnetically connected to the bottom of the magnet ring 11.

[0054] When working, the explosion-proof plug component mainly relies on the corrosion-resistant steel wire rope 16 inside the storage cavity 15 of each storage cylinder 14 to achieve tensioning when outward pressure appears in the later stage, so as to prevent the explosion-proof piston 7 and the piston rod 9 from excessively shifting outward and avoid the explosion plug phenomenon.

[0055] When the syringe is used, each strong magnetic column 17 is first adsorbed and fixed on the bottom of the magnet ring 11, so that when the piston rod 9 drives the push plate 10 to move outward, the maximum outward movement range of the explosion-proof piston 7 can be limited to the maximum extent by the corrosion-resistant steel wire rope 16, ensuring that the explosion-proof piston 7 is telescopically displaced within the displacement range limited by the piston chamber 6, while preventing explosion.

[0056] In any of the above schemes, it is preferred that a plurality of flexible support rings 18 are fixedly installed at intervals from top to bottom on the inner wall of the central mounting cavity 4 of the protective pen barrel 1, and the inner ring side wall of each flexible support ring 18 is tightly pressed against the outer side wall of the glass syringe barrel 5.

[0057] Each flexible support ring 18 mainly serves to limit and fix the outer wall of the lower end of the glass syringe barrel 5 extending into the inner ring thereof in a circumferential direction, thereby effectively ensuring the stability of the glass syringe barrel 5 after installation and preventing it from shaking.

[0058] In any of the above solutions, preferably, a lower magnet ring 19 is fixedly mounted on the top of each storage vertical cylinder 14 .

[0059] The lower magnet ring 19 installed at the bottom can serve the purpose of adsorption and fixation when the piston is in place, so that a larger opening force is required to open the piston when it is pulled outward, thereby ensuring the stability when a certain amount of liquid medicine is pre-filled and injected internally, preventing the liquid medicine from spilling during transfer and transportation, and making pre-filling safer during use.

[0060] The present invention also provides a method for achieving safe sterilization of an explosion-proof plug type prefilled syringe, comprising the following steps:

[0061] Disassemble the protective pen barrel 1, explosion-proof plug component, and syringe assembly of the explosion-proof plug type prefilled syringe one by one;

[0062] Take out each magnet ring 11 and each explosion-proof plug component and sterilize them at high temperature for 5-10 minutes, and control the sterilization temperature to be 100°C-150°C;

[0063] Place the remaining parts of the explosion-proof plug prefilled syringe into a water bath and boil them in boiling water for 5-10 minutes;

[0064] Sterilizing iron parts by high-temperature baking without water can effectively prevent water corrosion and ensure the safety of iron use. At the same time, the surface of each iron part is sprayed with an anti-corrosion coating to increase its service life.

[0065] Boiling the remaining non-iron parts in boiling water can effectively ensure the sterilization effect, and the boiling water sterilization operation is more convenient.

[0066] The explosion-proof plug type prefilled syringe components that have been sterilized by high temperature baking and boiling water are sent together into the hot air drying chamber for drying by circulating hot air;

[0067] After the components are completely dried, the components are assembled to form an explosion-proof plug type prefilled syringe;

[0068] The assembled explosion-proof plug type prefilled syringe is sent to a high temperature chamber for a high temperature explosion-proof test. When the pressure inside the piston cavity 6 increases due to the high temperature, the air pressure inside the piston cavity 6 will push the explosion-proof piston 7 outward.

[0069] When the explosion-proof piston 7 is shifted to the right position, the two explosion-proof plug components can achieve extension range limit and play the role of explosion-proof plugs.

[0070] In any of the above schemes, it is preferred that when circulating hot air drying is carried out inside the hot air drying chamber, ultraviolet irradiation is simultaneously configured inside the hot air drying chamber to achieve the purpose of sterilization.

[0071] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments may still be modified, or some or all of the technical features may be replaced by equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention. For those skilled in the art, any replacement, improvement or change made to the implementation mode of the present invention falls within the protection scope of the present invention.

[0072] The matters not described in detail in the present invention are all known technologies to those skilled in the art.

Claims

1. Explosion-proof plug type prefilled syringe, characterized in that: The invention comprises a protective pen barrel, a syringe assembly is installed inside the protective pen barrel, a bottom injection port of the syringe assembly extends out from the bottom pipe port of the protective pen barrel, a tightening assembly is installed on the outer side wall of the syringe assembly, the tightening assembly is screwed and fastened to the outer side wall of the protective pen barrel through an external thread, two explosion-proof plug components are symmetrically and spaced apart above the tightening assembly, and the upper ends of the explosion-proof plug components are both detachably fixedly connected to the upper part of the syringe assembly; The syringe assembly comprises a glass syringe barrel coaxially mounted in the central mounting cavity of the protective pen barrel, an explosion-proof piston is mounted in the piston cavity of the glass syringe barrel, a piston rod is fixedly mounted at the top center of the explosion-proof piston, the top of the piston rod extends out of the piston cavity and is fixedly connected to the bottom center of a push plate, and an attracting magnet ring is fixedly sleeved on the lower outer side wall of the push plate; The tightening assembly includes a connecting disk fixedly mounted on the upper outer side wall of the glass syringe barrel; The explosion-proof plug component includes a storage tube fixedly mounted on the top of the connecting disk outside the glass syringe barrel, and a corrosion-resistant steel wire rope is stored inside the storage cavity of the storage tube for preventing the piston rod from extending excessively outward. The bottom of the corrosion-resistant steel wire rope is fixed to the bottom of the storage cavity, and the top of the corrosion-resistant steel wire rope is movably extended to the upper part of the storage cavity and fixedly connected to a strong magnetic column, and the top of the strong magnetic column is magnetically connected to the bottom of the magnet ring.

2. The explosion-proof plug type prefilled syringe according to claim 1, characterized in that: The bottom of the glass syringe barrel abuts against the bottom of the central mounting cavity, and the bottom injection port of the glass syringe barrel extends out from the bottom pipe port at the central mounting cavity. A plurality of piston sealing rings are arranged on the outer side wall of the explosion-proof piston, and the outer side wall of each piston sealing ring is tightly sealed against the inner side wall of the piston cavity. The two sides of the bottom of the magnet ring are respectively connected to the explosion-proof plug components at corresponding positions.

3. The explosion-proof plug type prefilled syringe according to claim 2, characterized in that: An internal threaded tube is integrally fixedly connected to the lower part of the connecting plate, and an internal thread matching the external thread section of the upper outer wall of the protective pen barrel is arranged on the inner wall of the inner cavity of the internal threaded tube, and the bottom of the connecting plate is tightly pressed against the top of the glass syringe barrel.

4. The explosion-proof plug type prefilled syringe according to claim 3, characterized in that: A plurality of flexible support rings are fixedly installed at intervals from top to bottom on the inner side wall of the central installation cavity of the protective pen barrel, and the inner ring side wall of each flexible support ring is tightly pressed against the outer side wall of the glass syringe barrel.

5. The explosion-proof plug type prefilled syringe according to claim 4, characterized in that: A lower magnet attracting ring is fixedly installed on the top of each storage vertical cylinder.

6. A method for achieving safe sterilization of an explosion-proof plug type prefilled syringe, wherein the explosion-proof plug type prefilled syringe adopts the explosion-proof plug type prefilled syringe as claimed in claim 5, characterized in that: The steps include: Disassemble the protective pen barrel, explosion-proof plug component, and syringe assembly of the explosion-proof plug type prefilled syringe one by one; Take out each magnet ring and each explosion-proof plug component and sterilize them at high temperature for 5-10 minutes, and control the sterilization temperature to be 100℃-150℃; Place the remaining parts of the explosion-proof plug prefilled syringe into a water bath and boil them in boiling water for 5-10 minutes; The explosion-proof plug type prefilled syringe components that have been sterilized by high temperature baking and boiling water are sent together into the hot air drying chamber for drying by circulating hot air; After the components are completely dried, the components are assembled to form an explosion-proof plug type prefilled syringe; The assembled explosion-proof plug type prefilled syringe is sent into a high temperature chamber for a high temperature explosion-proof test. When the pressure inside the piston cavity increases due to the high temperature, the air pressure inside the piston cavity will push the explosion-proof piston outward. When the explosion-proof piston is moved into place, the two explosion-proof plug components can limit the extension range and play the role of explosion-proof plugs.

7. The method for achieving safe sterilization of an explosion-proof plug type prefilled syringe according to claim 6, characterized in that: When circulating hot air is drying inside the hot air drying chamber, ultraviolet light is also configured inside the hot air drying chamber to achieve the purpose of sterilization.

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