Safe self-destructing syringe

Abstract

The present invention discloses a safe self-destructing syringe, in which the needle structure has a first latch member and a second latch member at its upper end, and during the injection process, the first protrusion of the needle structure prevents it from retracting into the syringe, ensuring a safe injection. After the injection is completed, the first and second inner holes of the gasket are fitted with the first and second latch members, respectively. The inclined surface of the second latch member abuts the second protrusion ring of the gasket, and there is an escape space below the first latch member where it abuts the second protrusion ring, causing the central axis of the needle structure to be offset from the central axis of the syringe, allowing the plunger to be pulled into the syringe and achieve self-destruction. Furthermore, each part of the safe self-destructing syringe is completely free of the lubricating effect of lubricating oil or silicone oil, which means that each operation can be completed smoothly. The absence of silicone oil in the syringe reduces the risk of biological reactions caused by these substances, thereby significantly improving the biocompatibility of the product.

Description

[Technical Field]

[0001] The present invention relates to the field of syringe technology, and more particularly to safe, self-destructing syringes. [Background technology]

[0002] After the syringe injection is completed, the patient's body fluids or tissues will adhere to the needle tip, and the needle tip is sharp, making disposal and disposal inconvenient and increasing the risk of infection or needlestick injury for medical personnel and cleaners.

[0003] Self-destructing syringes generally employ a needle retraction mechanism within the syringe, where the plunger presses against a gasket, which then presses the liquid into the needle to inject the medicine. The gasket has an engaging structure at the tip that can fit onto the tail end of the needle, so that the gasket and the needle are tightly fastened together after the injection is completed. When the plunger is retracted, the gasket pulls the needle, allowing it to retract into the syringe. Such a design inevitably presents a contradiction in use. During the injection process, the needle encounters resistance from the skin tissue, causing it to move into the syringe. If the needle were to retract at this time, it would cause the syringe to leak and result in a medical accident. On the other hand, after the injection is completed, the gasket is fastened to the tail of the needle. At this time, the plunger must be pulled to retract the needle, but the force required to retract the plunger cannot be too great. First, the gasket is generally made of silica gel, and its structure cannot withstand such a large pulling force after engaging with the tail of the needle. Second, it is undesirable to pull the plunger back with too much force, as this would make it easier for medical professionals to operate. To achieve the effect of convenience for medical professionals, the static friction force required to prevent the needle from retracting during the injection process is generally greater than the pulling force required to pull the plunger back and retract the needle.

[0004] In order to resolve the above contradictions, the conventional retractable self-destructing syringe has a complicated structure, which makes it difficult to guarantee the quality of the product and results in poor practical use. As a result, the following problems are always encountered: 1. The sealing effect between the needle and the tip of the syringe is poor, making it easy for the tip of the syringe to leak during the injection process. 2. After the injection is completed, the gasket and the tail end of the needle do not fit tightly together during the process of pulling back the plunger, making it impossible to pull the needle back into the syringe. 3. When the injection needle is pulled back into the cylinder, the injection needle is easily pushed out again from the cylinder as the plunger is pushed forward, and thus does not achieve complete self-destruction. Summary of the Invention [Problem to be solved by the invention]

[0005] In view of this, it is an object of the present invention to provide a safe self-destructing syringe, which injects safely and has the feature that the needle tends to retract back into the syringe and self-destruct. [Means for solving the problem]

[0006] The technical solutions adopted by the present invention to solve the technical problems are as follows:

[0007] A safe self-destructing syringe includes a syringe, a plunger installed in the syringe, a gasket installed at the lower end of the plunger and having elasticity, and an injection needle structure attached to the lower end of the syringe, wherein the injection needle structure includes a first latch member installed at the upper end, and a second latch member installed below the first latch member and located on the opposite side, a slope is formed between the second latch member and the upper end surface of the injection needle, a first protrusion is installed directly below the second latch member on the same side, and the protrusion is engaged with the inner wall of the syringe. a first protrusion ring that limits movement of the injection needle structure toward the syringe; a first inner hole that can be fitted with a first latch member is provided at the lower end of the gasket; a second inner hole that can be fitted with a second latch member is provided below the first inner hole; a second protrusion ring is provided between the first and second inner holes; an escape space that can abut the second protrusion ring against the underside of the first latch member is provided below the first latch member; and the second protrusion ring can abut against the inclined surface, thereby misaligning the central axis of the injection needle structure with the central axis of the syringe.

[0008] The needle structure below the protrusion has a tapered body with a diameter gradually decreasing from top to bottom, and a sealing ring is provided outside the tapered body, and there are at least two sealing rings.

[0009] A liquid medicine chamber is formed between the gasket and the injection needle structure, and an injection chamber communicating with the liquid medicine chamber is provided at the upper end of the injection needle structure, and the chamber cross section of the injection chamber gradually increases from top to bottom.

[0010] On the outside of the gasket are installed several seal projection rings which are interference fitted with the cylinder inner wall.

[0011] A guide tapered surface is formed between the first latch member and the upper end surface of the injection needle structure.

[0012] A third latch member is installed at the lower end of the plunger, and a ring-shaped reverse hook side edge is formed on the outer side of the third latch member. A third inner hole that engages with the third latch member is installed at the upper end of the gasket.

[0013] The syringe includes a syringe chamber in which a gasket is located and a needle chamber in which a needle structure is mounted, the inner diameter of the syringe chamber being larger than the inner diameter of the needle chamber, forming a step surface between the syringe chamber and the needle chamber.

[0014] The needle structure may include a needle, and when the needle structure is positioned within the syringe chamber, the stepped surface may abut against the needle to limit its downward movement. [Effects of the Invention]

[0015] The beneficial effects of the present invention include at least the following:

[0016] 1. The syringe's suction and injection processes are the same as those of a normal syringe. After the injection is completed, the first latch member is first inserted into the first inner hole of the gasket, and the inclined surface on the opposite side of the first latch member abuts against the second protruding ring, which applies a force to the inclined surface. Meanwhile, there is an escape space below the first latch member on the opposite side, and the second protruding ring abuts against the first latch member, firmly inserting the first latch member into the first inner hole. At this time, the syringe needle structure tends to tilt toward the first latch member. Due to the elasticity of the gasket, as the gasket continues to move downward, the second latch member moves toward the first hook of the gasket. The gasket is fitted into the second inner hole, and the gasket and the needle structure are fully engaged. The plunger is then pulled up, causing the gasket to gradually move upward along with the needle structure. The slope on the upper end (right side) of the needle structure is subjected to an elastic force as it abuts against the second protrusion ring, causing the needle structure to tilt around the intersection between the central axis and the upper end face of the needle structure. The protrusions on the needle structure disengage from the first protrusion ring in the needle chamber, meaning that the first protrusion ring can no longer lock the protrusions and restrict the needle structure from moving upward. Finally, the needle structure smoothly retracts into the syringe chamber as the plunger is pulled up.

[0017] The advantages of this design are as follows: first, the design of the protrusion and first protrusion ring effectively prevents the needle from retracting due to resistance from the skin and tissue during the injection process, ensuring safe injection; second, the first and second latch members ensure a tight fit between the gasket and the needle structure during the plunger retraction process; and third, it resolves the contradiction in the use process of conventional retractable self-destructing syringes: the needle does not retract due to the large resistance from the skin and tissue during the injection process, and only a small pulling force is required to retract the needle after the injection is completed, completing the retraction and self-destruction of the needle.

[0018] 2. During the retraction of the injection needle structure, the optimized design of the injection needle structure and the gasket allows the injection needle structure to easily form a strong fitting relationship with the gasket, and this process can be easily achieved without the need for lubricating oil or silicone oil. During the retraction of the plunger, when the protrusion of the injection needle structure disengages from the first protrusion ring of the injection needle chamber, that is, when the first protrusion ring can no longer lock the protrusion and restrict the injection needle structure from moving upward, the injection needle structure can be easily separated from the injection needle chamber. Due to the optimized structure, this process can also be easily achieved without the need for lubricating oil or silicone oil. Each part of this safe self-destructing syringe is completely free from the lubricating effect of lubricating oil or silicone oil, meaning that each operation can be completed smoothly. The silicone oil-free syringe not only reduces potential chemical residues, but also reduces the risk of biological reactions that may be caused by these substances, thereby significantly improving the biocompatibility of the product.

[0019] 3. The first reverse hook tightly engages the first hook member with the first inner hole, and the second reverse hook tightly engages the second hook member with the second inner hole. The tapered guide surface formed between the first hook member and the upper end surface of the injection needle structure allows the first hook member to be easily fitted into the first inner hole.

[0020] 4. The second protrusion is used to abut against the upper surface of the first protrusion ring, which can restrict the needle structure from moving downward and prevent the needle structure from falling out of the needle chamber.

[0021] 5. Some sealing ring designs further prevent the liquid medicine from leaking out of the syringe, while also increasing the static friction between the syringe and the needle. The sealing ring is designed on the outside of the tapered needle. When the needle is subjected to downward pressure, the greater the static friction, the less likely the needle will retract due to resistance. When the needle is subjected to upward tension, the smaller the static friction, the more likely the needle will retract.

[0022] 6. The volume of the chamber body of the injection chamber gradually increases from top to bottom. When the injection begins, the gasket presses against the liquid chamber to relieve the large liquid pressure flowing into the injection chamber, thereby buffering the pressure of the fluid in the injection needle against the human body environment during injection.

[0023] 7. Several sealing protrusion rings can increase the sealing performance of the gasket, while also reducing the frictional resistance from the inner wall of the syringe when the plunger is pushed or pulled, making it easier to push or pull the plunger without the need for silicone oil, and further realizing the removal of silicone oil from the syringe.

[0024] 8. The reverse hook side of the third latch member of the plunger reinforces the tightness of contact when the plunger and gasket are fitted together.

[0025] 9. When the needle structure is pulled into the syringe chamber, the needle structure assumes an oblique shape, and the end of the needle abuts against the stepped surface between the syringe chamber and the needle chamber, preventing it from extending further and completing the self-destruction of the needle. [Brief explanation of the drawings]

[0026] [Figure 1] 1 is a cross-sectional view of the present safety self-destructing syringe. [Figure 2] 1 is a cross-sectional view of a portion of the present safety self-destructing syringe. [Figure 3] FIG. 2 is a structural schematic diagram of an injection needle structure. [Figure 4] FIG. 2 is a cross-sectional view of a portion of a syringe. [Figure 5] 10 is a cross-sectional view of a portion of the gasket and needle structure when mated. FIG. [Figure 6] 10 is a cross-sectional view of the needle structure as it is retracted into the syringe chamber along with the gasket. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0027] In order to clarify the technical problem to be solved, the technical solution adopted, and the technical effect achieved by the present invention, the technical solution of the present invention will be further described below by specific embodiments with reference to the drawings. It should be understood that the specific examples described herein are used to interpret the present invention, but do not limit the present invention. For the sake of convenience, the drawings only show a part relevant to the present invention, not all of it.

[0028] 1, 2 and 4, the present invention provides a safe self-destructing syringe, which includes a syringe 1, a plunger 2 installed in the syringe 1, an elastic gasket 3 installed at the lower end of the plunger 3 and connected thereto, and an injection needle structure 4 attached to the lower end of the syringe 1, the injection needle structure 4 including a first latch member 40 installed at the upper end thereof, and a second latch member 41 installed below the first latch member 40 and located on the opposite side thereof, a slope 410 is formed between the second latch member 41 and the upper end surface of the injection needle structure 4, a protrusion 43 is installed directly below the second latch member 41 on the same side, and the protrusion 43 is attached to the inner wall of the syringe 1. a first inner hole 301 that can be fitted with a first latch member 40 at the lower end of the gasket 3; a second inner hole 302 that can be fitted with a second latch member 41 below the first inner hole 301; a second protrusion ring 300 that is installed between the first inner hole 301 and the second inner hole 302; an escape space 47 that can abut the second protrusion ring 300 against the underside of the first latch member 40 is installed below the first latch member 40; and the second protrusion ring 300 can abut against the inclined surface 410, thereby misaligning the central axis of the injection needle structure 4 with the central axis of the syringe 1.

[0029] Furthermore, the design of the protrusions 43 and the first protrusion ring 110 effectively prevents the injection needle from retracting due to the resistance of the skin and tissue during the injection process, thereby realizing a safe injection. The first latch member 40 and the second latch member 41 can ensure a tight fit between the gasket 3 and the injection needle structure 4 during the process of retracting the plunger 2. This safe self-destructing syringe solves the contradiction in the use process of conventional retractable self-destructing syringes. During the injection process, the injection needle does not retract due to the large resistance of the skin and tissue. After the injection is completed, the injection needle can be retracted with only a small pulling force, completing the retraction and self-destruction of the injection needle.

[0030] Referring to Figure 2 or Figure 3, the first hook member 40 includes a first reverse hook 401 and a guide tapered surface 400 installed on the first reverse hook 401, and the second hook member 41 includes a second reverse hook 411 installed on the lower end of a slope 410.

[0031] Referring to FIG. 2 , a second protrusion 46 that can come into contact with the upper surface of the first protrusion ring 110 is provided directly below the escape space 47 on the same side. The second protrusion 46 can restrict the downward movement of the injection needle structure 4, thereby preventing the injection needle structure 4 from falling out of the injection needle chamber 11.

[0032] 3, the injection needle structure 4 below the protrusion 43 has a tapered body with a diameter gradually decreasing from top to bottom, and at least two sealing rings 42 are installed outside the tapered body. Preferably, two sealing rings 42 are installed, installed at different positions above and below the outside of the injection needle structure 4, and the diameter of the lower sealing ring 42 is smaller than that of the upper sealing ring 42.

[0033] Furthermore, the design of the sealing ring 42 further prevents the medicinal liquid from leaking out of the syringe 1 while increasing the static friction force between the injection needle structure 4 and the syringe 1. The sealing ring 42 is designed on the outside of the tapered injection needle structure 4. When the injection needle structure 4 is subjected to a downward pressure, the greater the static friction force, the less likely the injection needle structure 4 will retract due to resistance. When the injection needle structure 4 is subjected to an upward pulling force, the smaller the static friction force, the more likely the injection needle structure 4 will be pulled back.

[0034] Referring to FIG. 2, a liquid medicine chamber 5 is formed between the gasket 3 and the injection needle structure 4. An injection chamber 44 communicating with the liquid medicine chamber 5 is provided at the upper end of the injection needle structure 4. The cross section of the injection chamber 44 gradually increases from top to bottom. When injection begins, the gasket 4 presses against the liquid medicine chamber 5 to relieve the large pressure of the liquid flowing into the injection chamber 44, thereby buffering the pressure of the fluid in the injection needle 45 against the human body environment during injection.

[0035] 2, several seal protrusion rings 31 are installed on the outside of the gasket 3 and are fitted tightly with the inner wall of the syringe 1. The several seal protrusion rings 31 can increase the sealing performance of the gasket 3 while reducing the frictional resistance from the inner wall of the syringe 1 when the plunger 2 is pushed or pulled.

[0036] Preferably, referring to FIG. 2, a guide tapered surface 400 is formed between the first latch member 40 and the upper end surface of the injection needle structure 4, and the guide tapered surface 400 allows the first latch member 40 to be easily fitted into the first inner hole 301.

[0037] Referring to FIG. 2 , a third latch member 20 is installed at the lower end of the plunger 2, and a ring-shaped reverse hook side edge 200 is formed on the outer side of the third latch member 20. A third inner hole 303 that fits into the third latch member 20 is installed at the upper end of the gasket 3, and the reverse hook side edge 200 of the third latch member 20 of the plunger 2 reinforces the tightness of contact when the plunger 2 and the gasket 3 are fitted together.

[0038] 4, the syringe 1 includes a syringe chamber 10 in which a gasket 3 is located and a needle chamber 11 in which a needle structure 4 is mounted. The inner diameter of the syringe chamber 10 is larger than that of the needle chamber 11, and a step surface 12 is formed between the syringe chamber 10 and the needle chamber 11. The needle structure 4 includes a needle 45. When the needle structure 4 is pulled into the syringe chamber 10, the needle structure 4 assumes an oblique shape, and the end of the needle 45 abuts against the step surfaces 12 between the syringe chamber 10 and the needle chamber 11, preventing it from extending further and completing the self-destruction of the needle.

[0039] The process and principle of use of this safe self-destructing syringe are as follows:

[0040] The syringe's suction and injection processes are the same as those of a normal syringe. After the injection is completed, the first latch member 40 is first fitted into the first inner hole 301 of the gasket 3, and the inclined surface 410 located on the opposite side of the first latch member 40 abuts against the second protrusion ring 300. As shown in FIG. 5, the inclined surface receives a force. Meanwhile, there is an escape space 47 below the first latch member 40 on the opposite side. The second protrusion ring 300 abuts against the first latch member 40, causing the first latch member 40 to be firmly fitted into the first inner hole 301. At this time, the injection needle structure 4 has a tendency to tilt toward the first latch member 40 (clockwise in FIG. 5). Due to the elasticity of the gasket 3, as the gasket 3 continues to move downward, the second latch member 41 The gasket 3 is fitted into the second inner hole 302 of the gasket 3, and the gasket 3 and the injection needle structure 4 are fully engaged with each other. Then, the plunger 2 is pulled up, and the gasket 3 gradually moves upward along with the injection needle structure 4. The inclined surface 410 at the upper end (right side) of the injection needle structure 4 is subjected to an elastic force as it abuts against the second protrusion ring 300, causing the injection needle structure 4 to tilt around the intersection between the central axis and the upper end surface of the injection needle structure 4. The protrusions 43 of the injection needle structure 4 disengage from the first protrusion ring 110 of the needle chamber 11, i.e., the first protrusion ring 110 can no longer lock the protrusions 43, allowing the injection needle structure 4 to move upward. Finally, the injection needle structure 4 smoothly retracts into the syringe chamber 10 as the plunger 2 is pulled up.

Claims

1. The safety self-destructing syringe includes a syringe (1), a plunger (2) installed in the syringe (1), an elastic gasket (3) installed at the lower end of the plunger (2) and connected thereto, and an injection needle structure (4) attached to the lower end of the syringe (1), wherein the injection needle structure (4) includes a first latch member (40) installed at the upper end thereof, and a second latch member (41) installed below the first latch member (40) and located on the opposite side thereof, a slope (410) is formed between the second latch member (41) and the upper end surface of the injection needle structure (4), and a first protrusion (43) is installed directly below the second latch member (41) on the same side thereof, and the upper surface of the first protrusion (43) engages with the inner wall of the syringe (1) to restrict movement of the injection needle structure (4) toward the syringe (1). a first inner hole (301) that can be fitted with a first latch member (40) is provided at the lower end of the gasket (3); a second inner hole (302) that can be fitted with a second latch member (41) is provided below the first inner hole (301); a guide tapered hole (304) is provided below the second inner hole (302); a second protrusion ring (300) is provided between the first inner hole (301) and the second inner hole (302); an escape space (47) is provided below the first latch member (40) to allow the second protrusion ring (300) to abut against the underside of the first latch member (40); and the second protrusion ring (300) can abut against a slope (410), thereby misaligning the central axis of the injection needle structure (4) with the central axis of the syringe.

2. The safety self-destructing syringe according to claim 1, characterized in that the first latch member (40) includes a first inverted latch hook (401) and a guide tapered surface (400) installed on the first inverted latch hook (401), and the second latch member (41) includes a second inverted latch hook (411) installed at the lower end of a slope (410).

3. 2. The safety self-destructing syringe according to claim 1, wherein a second protrusion (46) that can abut against the upper surface of the first protrusion ring (110) is provided directly below the same side of the escape space (47), and the second protrusion (46) can limit the downward movement of the injection needle structure (4).

4. The safety self-destructing syringe according to claim 1, characterized in that the injection needle structure (4) below the first protrusion (43) presents a tapered body whose diameter gradually decreases from top to bottom, and a sealing ring (42) is installed outside the tapered body, and the sealing ring (42) is at least two.

5. 2. The safety self-destructing syringe according to claim 1, wherein a liquid medicine chamber (5) is formed between the gasket (3) and the injection needle structure (4), an injection chamber (44) communicating with the liquid medicine chamber (5) is provided at the upper end of the injection needle structure (4), and the cross section of the injection chamber (44) gradually increases from top to bottom.

6. 2. The safety self-destructing syringe according to claim 1, characterized in that the gasket (3) is provided on the outside with several sealing protrusion rings (31) which are in an interference fit with the inner wall of the syringe (1).

7. 2. The safety self-destructing syringe according to claim 1, wherein a third latch member (20) is installed at the lower end of the plunger (2), a ring-shaped inverted hook side edge (200) is formed on the outer side of the third latch member (20), and a third inner hole that fits with the third latch member (20) is installed at the upper end of the gasket (3).

8. 2. The safety self-destructing syringe according to claim 1, wherein the syringe (1) comprises a syringe chamber (10) in which the gasket (3) is located and a needle chamber (11) in which the needle structure (4) is mounted, the inner diameter of the syringe chamber (10) being larger than the inner diameter of the needle chamber (11), and a step surface (12) being formed between the syringe chamber (10) and the needle chamber (11).

9. 9. The safety self-destructing syringe according to claim 8, wherein the needle structure (4) includes a needle (45), and when the needle structure (4) is positioned in the syringe chamber (10), the step surface (12) can abut against the needle (45) to restrict it from moving downward.

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