A safety syringe

Abstract

The application relates to the technical field of medical equipment, and discloses a disposable syringe capable of preventing injury, which comprises a needle cylinder, a needle head is connected to the upper end of the needle cylinder, a rubber plug is movably sleeved in the needle cylinder, and a top rod is fixedly connected to the bottom of the rubber plug. Through the arrangement of the straight rod, the air cavity and the high-pressure gas chamber, the air in the air cavity is extruded into the cavity along with the pushing of the plunger by the ejector pin, so that the tail end sharp head of the straight rod pierces the high-pressure-resistant film, the high-pressure inert gas in the high-pressure gas chamber enters the cavity, the high-pressure gas can push the straight rod to move to the end of the needle head, and the straight rod enters the needle tube along the needle head and extends out of the needle tube. Since the rubber plug segment cut off firstly extends out of the needle tube, people will not be injured by the sharp end of the needle head when handling or destroying the contact needle head, the harm caused by the needle head injury can be avoided, even infection, and the needle head can be completely avoided from being reused.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to a disposable syringe designed to prevent injury. Background Technology

[0002] A syringe is a common medical device, primarily used to draw or inject gas or liquid using a needle. Common medical syringes, however, are medical devices that use needle puncture techniques to inject medication into tissues, subcutaneous tissue, blood vessels, and muscles.

[0003] Because syringes are widely used in both large hospitals and small medical stations, and to prevent infection and disease transmission from blood, medication, or other contaminants in the needle hole of used syringes, medical syringes are designed for single use. To ensure that syringes are not reused after injection, medical staff usually break the needle after injection. However, this method still carries the risk of reuse, as the needle tube remains intact even after being broken. Reused syringes pose a risk of cross-infection and can easily lead to the spread of disease. Furthermore, whether the needle is broken or disposed of after injection, the sharp tip can still cause injury or infection to medical staff and those handling the disposal. Summary of the Invention

[0004] To address the shortcomings of the aforementioned background technology, this invention provides a disposable syringe that prevents injury, possessing the advantages of rapid self-destruction and avoiding needle-related injuries, thus solving the problems raised in the background technology.

[0005] The present invention provides the following technical solution: a disposable syringe for preventing injury, comprising a syringe barrel, a needle being snapped into the upper end of the syringe barrel, a rubber stopper being movably sleeved inside the syringe barrel, a push rod being fixedly connected to the bottom of the rubber stopper, a support sleeve being movably sleeved on the upper part of the inner cavity of the syringe barrel, a support spring being fixedly connected to both sides of the upper end of the support sleeve, and a push pin being fixedly connected to the syringe barrel on both sides of the middle part of the upper end of the support sleeve.

[0006] Preferably, the push rod has an internal cavity, and a high-pressure gas chamber connected to the cavity is formed at the bottom end of the push rod. The high-pressure gas chamber is filled with high-pressure inert gas. A straight rod is movably sleeved inside the cavity. A connecting spring is fixedly connected to the upper end of the straight rod and to the other end of the rod by a rubber plug. Gas chambers connected to the upper end of the cavity are provided on both sides of the rubber plug. A return spring is fixedly connected to the bottom of the gas chamber. A piston movably sleeved with the gas chamber is fixedly connected to the other end of the return spring. A limit ring is fixedly connected to the middle of the upper end of the syringe cavity.

[0007] Preferably, the end of the ejector pin facing the rubber stopper is provided with a pointed tip, and barbs are provided on both sides of the pointed tip. The bottom of the support sleeve is provided with flexible rubber at the position corresponding to the ejector pin.

[0008] Preferably, the end of the straight rod facing the high-pressure gas chamber is provided with a pointed tip, the inert gas inside the high-pressure gas chamber is helium, and a high-pressure resistant membrane is provided at the connection between the high-pressure gas chamber and the cavity.

[0009] Preferably, the diameter of the straight rod is equal to the inner diameter of the limiting ring and the needle tube, the end of the limiting ring facing the rubber stopper is provided with a pointed bevel, and the length of the straight rod is greater than the length of the needle tube.

[0010] The present invention has the following beneficial effects:

[0011] 1. By using the support sleeve and the ejector needle, after normal injection, medical staff can press the ejector rod twice and forcefully to press the rubber stopper inside the syringe against the support sleeve. Continuous pressing will cause the tip of the ejector needle to pierce the flexible rubber at the bottom of the support sleeve and embed itself in the rubber stopper. Because the tip of the ejector needle has barbs on both sides, it is difficult to pull the needle out after it is embedded in the rubber stopper, thus preventing it from being reused and achieving self-destruction of the syringe.

[0012] 2. Through the design of the straight rod, air chamber, and high-pressure air chamber, as the ejector pin pushes the piston, the piston compresses the air inside the air chamber into the cavity, causing the straight rod to move towards the rear end of the ejector pin. This allows the pointed end of the straight rod to pierce the high-pressure resistant membrane between the high-pressure air chamber and the cavity. The high-pressure inert gas inside the high-pressure air chamber enters the cavity, thus pushing the straight rod towards one end of the needle. The rod then travels along the needle and enters the needle tube, extending out of the tube. Because the front end of the straight rod is equipped with a connecting spring connected to the rubber stopper, the first part to extend from the needle tube is the cut-off rubber stopper segment. This eliminates the possibility of being pricked by the sharp tip of the needle when handling or disposing of the needle, preventing injuries or even infections caused by needle pricks, and completely preventing reuse. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall appearance of the structure of the present invention;

[0014] Figure 2 This is a schematic diagram of the internal structure of the present invention;

[0015] Figure 3 This is an enlarged schematic diagram of section A of the structure of the present invention.

[0016] In the diagram: 1. Syringe; 2. Needle; 3. Rubber stopper; 4. Push rod; 5. Support sleeve; 6. Support spring; 7. Push pin; 8. Cavity; 9. Straight rod; 10. Connecting spring; 11. High-pressure air chamber; 12. Air chamber; 13. Return spring; 14. Piston; 15. Limiting ring. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Please see Figure 1-3 A disposable syringe designed to prevent injury includes a syringe barrel 1, with a needle 2 attached to the upper end of the syringe barrel 1. A rubber stopper 3 is movably fitted inside the syringe barrel 1, and a push rod 4 is fixedly connected to the bottom of the rubber stopper 3. A support sleeve 5 is movably fitted to the upper part of the inner cavity of the syringe barrel 1. Support springs 6, whose other ends are fixedly connected to the syringe barrel 1, are fixedly connected to both sides of the upper end of the support sleeve 5. Push pins 7, fixedly connected to the syringe barrel 1, are provided on both sides of the middle part of the upper end of the support sleeve 5. A cavity 8 is opened inside the push rod 4, and a high-pressure gas chamber 11, which communicates with the cavity 8, is opened at the bottom end of the push rod 4. The high-pressure gas chamber 11 is filled with high-pressure inert gas. A straight rod 9 is movably connected inside the cavity 8. The end of the straight rod 9 facing the high-pressure gas chamber 11 is provided with a pointed tip. The inert gas inside the high-pressure gas chamber 11 is helium. A high-pressure resistant membrane is provided at the connection between the high-pressure gas chamber 11 and the cavity 8. The upper end of the straight rod 9 is fixedly connected to a connecting spring 10, which is fixedly connected to a rubber plug 3 at the other end. Both sides of the rubber plug 3 are provided with gas chambers 12 that are connected to the upper end of the cavity 8. A return spring 13 is fixedly connected to the bottom of the gas chamber 12. The other end of the return spring 13 is fixedly connected to a piston 14 that is movably connected to the gas chamber 12. A limit ring 15 is fixedly connected to the middle of the upper end of the inner cavity of the syringe 1.

[0019] The ejector pin 7 has a pointed end facing the rubber stopper 3, and barbs are provided on both sides of the pointed end. The bottom of the support sleeve 5 is provided with flexible rubber corresponding to the ejector pin. By pressing the ejector rod 4 twice and with great force, the pointed end of the ejector pin 7 pierces the flexible rubber at the bottom of the support sleeve 5 and inserts into the rubber stopper 3. Because the pointed end of the ejector pin 7 has barbs on both sides, it is difficult to pull out the ejector pin 7 after it is inserted into the rubber stopper 3, thereby achieving the self-destruction of the syringe.

[0020] The diameter of the straight rod 9 is equal to that of the limiting ring 15 and the inner diameter of the needle tube of the needle 2. The limiting ring 15 has a pointed bevel at one end facing the rubber stopper 3. The length of the straight rod 9 is greater than the length of the needle tube of the needle 2, so that the straight rod can be inserted into the needle tube of the needle 2 to block the needle tube. The straight rod 9 replaces the needle 2 to prevent the sharp needle 2 from injuring people.

[0021] Working principle: After normal injection, medical staff can press the top rod 4 twice and forcefully to press the rubber stopper 3 inside the syringe against the support sleeve 5, and continue to press, so that the tip of the needle 7 pierces the flexible rubber at the bottom of the support sleeve 5 and gets stuck in the rubber stopper 3. Since the tip of the needle 7 is provided with barbs on both sides, it is difficult to pull out the needle 7 after it is stuck in the rubber stopper 3, thereby achieving the self-destruction of the syringe.

[0022] As the ejector pin 7 continues to advance, its tip will push the piston 14, causing it to move downwards against the force of the return spring 13. This forces the air inside the air chamber 12 into the cavity 8, causing the straight rod 9 to move towards the rear end of the ejector pin 4 against the tension of the connecting spring 10. This allows the pointed end of the straight rod 9 to pierce the high-pressure resistant membrane between the high-pressure air chamber 11 and the cavity 8, allowing the high-pressure inert gas inside the high-pressure air chamber 11 to enter the cavity 8. Simultaneously, because the rubber stopper 3 is in contact with the limiting ring 15, the limiting ring 15 will... The middle section is cut off, so the high-pressure gas can push the straight rod 9 to move towards one end of the needle 2, and enter the needle tube along the needle 2 and extend out of the needle tube. Since the front end of the straight rod 9 is provided with a connecting spring 10 connected to the rubber stopper 3, the first thing to extend out of the needle tube is the cut-off rubber stopper 3 segment. In this way, when people handle or destroy the contact needle 2, there is no possibility of being pricked by the sharp tip of the needle 2, which can avoid the injury or even infection caused by the needle 2 prick, and can completely prevent reuse.

[0023] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0024] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A disposable syringe for preventing injury, comprising a syringe (1), wherein a needle (2) is snapped onto the upper end of the syringe (1), a rubber stopper (3) is movably fitted inside the syringe (1), and a push rod (4) is fixedly connected to the bottom of the rubber stopper (3), characterized in that: The upper part of the inner cavity of the syringe (1) is movably sleeved with a support sleeve (5). The upper end of the support sleeve (5) is fixedly connected to two sides of a support spring (6) whose other end is fixedly connected to the syringe (1). The upper middle part of the support sleeve (5) is provided with a push pin (7) fixedly connected to the syringe (1). The push rod (4) has a cavity (8) inside. The bottom end of the push rod (4) has a high-pressure air chamber (11) connected to the cavity (8). The high-pressure air chamber (11) is filled with high-pressure inert gas. A straight rod (9) is movably sleeved inside the cavity (8). The upper end of the straight rod (9) is fixedly connected to a connecting spring (10) fixedly connected to the other end of the rubber plug (3). Both sides of the rubber plug (3) are provided with air chambers (12) connected to the upper end of the cavity (8). A return spring (13) is fixedly connected to the bottom of the air chamber (12). The other end of the return spring (13) is fixedly connected to a piston (14) movably sleeved with the air chamber (12). A limit ring (15) is fixedly connected to the middle of the upper end of the inner cavity of the syringe (1). The ejector pin (7) has a pointed end facing the rubber stopper (3), and barbs are provided on both sides of the pointed end. The bottom of the support sleeve (5) is provided with flexible rubber corresponding to the position of the ejector pin. The straight rod (9) has a pointed end facing the high-pressure gas chamber (11). The inert gas inside the high-pressure gas chamber (11) is helium, and a high-pressure resistant membrane is provided at the connection between the high-pressure gas chamber (11) and the cavity (8). The diameter of the straight rod (9) is equal to that of the limiting ring (15) and the inner diameter of the needle tube of the needle (2). The limiting ring (15) has a pointed bevel at one end facing the rubber stopper (3). The length of the straight rod (9) is greater than the length of the needle tube of the needle (2).

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