Safe self-destruction syringe

Abstract

A safe self-destruction syringe. A first hanging buckle (40) and a second hanging buckle (41) are arranged at the upper end of a needle head structure (4) of the safe self-destruction syringe; in an injection process, a first boss (43) of the needle head structure (4) limits the needle head structure to return to a barrel (1), so that safe injection is achieved; when injection is finished, a first inner hole (301) and a second inner hole (302) of a sealing plunger (3) respectively cooperate with the first hanging buckle (40) and the second hanging buckle (41), an inclined surface (410) on the second hanging buckle (41) abuts against a second protruding ring (300) of the sealing plunger (3), and a clearance space (47) allowing for abutment of the second protruding ring (300) is present below the first hanging buckle (40), so that the central axis of the needle head structure (4) and the central axis of the barrel (1) deflect, and self-deconstruction can be achieved when a push rod (2) is pulled into the barrel (1). In addition, all parts of the safe self-destruction syringe can smoothly finish various operations without using the lubricating effect of a lubricating oil or a silicon oil, and the desilicification of the syringe reduces the biological reaction risk caused by these substances, thereby significantly improving the biocompatibility of a product.

Description

A safe self-destructing syringe Technical Field

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

[0002] After the injection is completed, the needle tip will be stained with the patient's body fluids or tissues, and the needle tip is relatively sharp, which makes it inconvenient to discard and handle, increasing the risk of infection or puncture for medical staff and cleaning staff.

[0003] Self-destructive syringes generally retract the needle into the syringe. The push rod in the syringe pushes the sealing plug, causing the sealing plug to squeeze the drug liquid into the needle to achieve injection. Since the front end of the sealing plug is provided with a snap-fit ​​structure that can cooperate with the tail end of the needle, the sealing plug and the needle are tightly buckled together after the injection is completed. When the push rod is pulled back, the sealing plug drags the needle to retract the needle into the syringe. This design has an inevitable contradiction in use, that is, during the needle injection process, the needle is subject to resistance from the skin tissue, and the needle tends to move into the syringe. If the needle retracts at this time, it will cause the syringe to leak, resulting in a medical accident; on the other hand, when the injection is completed, the sealing plug is fastened to the tail of the needle. At this time, the push rod needs to be pulled to drag the needle to the retracted state, but the force of pulling back the push rod cannot be too large. First, the sealing plug is generally made of silicone. After being fastened to the tail of the needle, the structure cannot withstand such a large pulling force. Second, the force of pulling back the push rod should not be too large to facilitate the operation of medical staff. In order to achieve the effect of convenience for medical staff, the static friction required to prevent the needle from retracting during the needle injection process is generally greater than the pulling force required to pull back the push rod to withdraw the needle.

[0004] In order to balance the above contradictions, the existing retractable self-destructing syringes have a complex structure, the product quality is difficult to guarantee, and the actual use effect is not good. The following problems often occur:

[0005] 1. The sealing effect between the needle and the front end of the syringe is not good, and the front end of the syringe is prone to leakage during injection;

[0006] 2. After the needle is injected, when the push rod is pulled back, the sealing plug and the tail end of the needle are not firmly fitted together, and the needle cannot be pulled back into the syringe;

[0007] 3. When the needle is pulled back into the syringe, the needle is easily pushed forward by the push rod and then pushed out of the syringe, and complete self-destruction is not achieved.

[0008] Summary of the Invention

[0009] In view of this, an object of the present invention is to provide a safety self-destructing syringe, which has the characteristics of safe injection and the needle being easier to pull back into the syringe and self-destruct.

[0010] The technical solution adopted by the present invention to solve the technical problem is:

[0011] The syringe has a first end for locking the syringe in the locking cam and a second end for locking the syringe in the locking cam, the second end for locking the syringe in the locking cam being locked and the locking cam being locked.

[0012] The needle structure below the boss is in the form of a cone with a diameter gradually decreasing from top to bottom. A sealing ring is provided outside the cone, and there are at least two sealing rings.

[0013] A liquid medicine cavity is formed between the sealing plug and the needle structure. An injection cavity communicating with the liquid medicine cavity is provided at the upper end of the needle structure. The cross section of the injection cavity gradually increases from top to bottom.

[0014] The outside of the sealing plug is provided with a plurality of sealing convex rings which are interference-fitted with the inner side wall of the syringe.

[0015] A guiding cone is formed between the first hook and the upper end surface of the needle structure.

[0016] The lower end of the push rod is provided with a third hook, the outer side of the third hook forms an annular barb side, and the upper end of the sealing plug is provided with a third inner hole that cooperates with the third hook.

[0017] The syringe comprises a syringe cavity where the sealing plug is located and a needle cavity where the needle structure is installed. The inner diameter of the syringe cavity is larger than the inner diameter of the needle cavity, and a step surface is formed between the syringe cavity and the needle cavity.

[0018] The needle structure includes a needle port. When the needle structure is located in the syringe cavity, the step surface can abut against the needle port to limit its downward movement.

[0019] The beneficial effects of the present invention include at least:

[0020] 1. The aspiration and injection process of the syringe is the same as that of an ordinary syringe. When the injection is completed, first, the first hook is embedded in the first inner hole of the sealing plug, and the inclined surface on the opposite side of the first hook is abutted by the second convex ring. Here, the inclined surface is subjected to a force, and there is an escape space under the first hook on the opposite side. The second convex ring abuts under the first hook so that the first hook is firmly embedded in the first inner hole. At this time, the needle structure tends to tilt toward the first hook. Since the sealing plug is elastic, as the sealing plug continues to move downward, the second hook The buckle is embedded into the second inner hole of the sealing plug, and the sealing plug and the needle structure are buckled together. Then the push rod is pulled up, and the sealing plug drives the needle structure to move gradually upward. The inclined surface of the upper end (right side) of the needle structure is abutted by the elastic force of the second convex ring, which makes the needle structure tilt around the intersection of the central axis and the upper end face of the needle structure, causing the boss of the needle structure to separate from the first convex ring of the needle barrel, that is, the first convex ring can no longer clamp the boss to limit the upward movement of the needle structure. Finally, the needle structure smoothly retreats into the syringe cavity as the push rod is pulled up.

[0021] The benefits of this design are as follows: First, the design of the boss and the first raised ring effectively prevents the needle from retracting due to resistance from the skin and tissue during injection, ensuring safe injection. Second, the first and second hooks ensure a tight fit between the sealing plug and the needle structure during the retraction of the push rod. Third, it resolves the contradictions in the use process of traditional retractable self-destructing syringes. During injection, the needle can withstand greater resistance from the skin and tissue without retracting. After the injection is completed, only a small pulling force is required to pull the needle back, completing the needle's retraction and self-destruction.

[0022] [Corrected 18.09.2024 in accordance with Rule 26] 2. During the retraction of the needle structure, the optimized design of the needle structure and the sealing plug allows the needle structure to more easily form a more stable fit with the sealing plug, and this process can be easily achieved without the use of lubricating oil or silicone oil. Furthermore, during the retraction of the needle structure by the push rod, when the boss of the needle structure disengages from the first convex ring of the needle barrel, that is, the first convex ring can no longer grip the boss to restrict the upward movement of the needle structure, the needle structure can be easily pulled out of the needle cavity. This optimized structure also makes this process easy to achieve without the use of lubricating oil or silicone oil.

[0023] [Corrected 18.09.2024 according to Rule 26] The various parts of the safe self-destruct injection can completely get rid of the lubrication effect of lubricating oil or silicone oil, so that various operations can be completed smoothly. The desilicone oil removal of the syringe not only reduces potential chemical residues, but also reduces the risk of biological reactions that these substances may cause, thereby significantly improving the biocompatibility of the product.

[0024] 3. The first barb enables the first hook to be tightly fastened to the first inner hole, and the second barb enables the second hook to be tightly fastened to the second inner hole. The guide cone surface formed between the first hook and the upper end surface of the needle structure makes it easier for the first hook to be embedded in the first inner hole.

[0025] 4. The second boss is used to abut against the upper surface of the first convex ring, which can limit the downward movement of the needle assembly and prevent the needle assembly from falling out of the needle cavity.

[0026] 5. The design of several sealing rings, on the one hand, further prevents the drug solution from flowing out of the syringe, and on the other hand, increases the static friction between the needle structure and the syringe. The sealing rings are designed outside the conical needle structure. When the needle structure is subjected to downward pressure, the greater the static friction, the less likely the needle structure is to retract due to resistance. When the needle structure is subjected to upward pulling force, the smaller the static friction, the easier it is for the needle structure to pull back.

[0027] 6. The volume of the injection cavity gradually increases from top to bottom, so that when the injection starts, the sealing plug is slowed down to squeeze the liquid cavity into the injection cavity, which reduces the pressure of the fluid at the needle port on the human body environment during injection.

[0028] [Corrected 18.09.2024 according to Rule 26] 7. Several sealing cams can increase the sealing performance of the sealing plug and, on the other hand, reduce the frictional resistance from the inner wall of the syringe when the push rod is pushed and pulled, so that the push rod can be easily pushed and pulled without the action of silicone oil, further achieving the de-silicone oiling of the syringe.

[0029] 8. The side of the barb of the third hook of the push rod strengthens the tightness of the push rod and the sealing plug when they are fitted together.

[0030] 9. When the needle structure is pulled into the syringe cavity, the needle structure is tilted, and the end of the needle mouth abuts against the step surface between the syringe cavity and the needle cavity, so that it cannot be extended any further to complete the self-destruction of the needle. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] FIG1 is a cross-sectional view of the safety self-destructing syringe;

[0032] FIG2 is a partial cross-sectional view of the safety self-destructing syringe;

[0033] FIG3 is a schematic structural diagram of a needle structure;

[0034] FIG4 is a partial cross-sectional view of the syringe;

[0035] FIG5 is a partial cross-sectional view of the sealing plug and the needle structure when they are engaged;

[0036] FIG6 is a cross-sectional view of the needle structure when the sealing plug is pulled back into the syringe cavity. DETAILED DESCRIPTION

[0037] To make the technical problems solved by the present invention, the technical solutions adopted, and the technical effects achieved more clearly, the technical solutions of the present invention are further described below with reference to the accompanying drawings and through specific embodiments. It should be understood that the specific embodiments described herein are merely for the purpose of explaining the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the drawings only show portions relevant to the present invention, not all of them.

[0038] 1, 2 and 4, the present invention proposes a safety self-destruct syringe, comprising a syringe 1, a push rod 2 provided in the syringe 1, a sealing plug 3 with elasticity provided at the lower end of the push rod 2 and connected thereto, a needle structure 4 installed at the lower end of the syringe 1, the needle structure 4 comprising a first hook 40 provided at the upper end, a second hook 41 provided below the first hook 40 and located on the opposite side, an inclined surface 410 is formed between the second hook 41 and the upper end surface of the needle structure 4, a boss 43 is provided just below the same side of the second hook 41, and the inner wall of the syringe 1 is provided with a hook that can be stuck on the boss 43 to limit A first convex ring 110 is provided to control the needle structure 4 to move toward the syringe 1. The lower end of the sealing plug 3 is provided with a first inner hole 301 that can cooperate with the first hook 10, and a second inner hole 302 that can cooperate with the second hook 41 below the first inner hole 301. A second convex ring 300 is provided between the first inner hole 301 and the second inner hole 302. A avoidance space 47 is provided below the first hook 40 to allow the second convex ring 300 to abut against the bottom of the first hook 40. The second convex ring 300 can abut against the inclined surface 410, so that the central axis of the needle structure 4 and the central axis of the syringe 1 are deviated.

[0039] Furthermore, the design of the boss 43 and the first protruding ring 110 effectively prevents the needle from retreating due to the resistance of the skin and tissue during the injection process, thereby achieving safe injection; the first hook 40 and the second hook 41 can ensure the tight fit between the sealing plug 3 and the needle structure 4 during the process of pulling back the push rod 2; this safety self-destructing syringe solves the contradictions in the use process of traditional retractable self-destructing syringes. During the injection process, the needle can withstand greater resistance from the skin and tissue without retreating. After the injection is completed, only a small pulling force is needed to pull back the needle, completing the retreat and self-destruction of the needle.

[0040] 2 or 3 , the first hook 40 includes a first barb 401 and a guide conical surface 400 provided on the first barb 401 , and the second hook 41 includes a second barb 411 provided at the lower end of the inclined surface 410 .

[0041] 2 , a second boss 46 that can abut against the upper surface of the first convex ring 110 is provided just below the same side of the avoidance space 47 . The second boss 46 can limit the downward movement of the needle assembly 4 to prevent the needle assembly 4 from falling out of the needle cavity 11 .

[0042] Referring to Figure 3 , the needle structure 4 below the boss 43 is tapered, with its diameter gradually decreasing from top to bottom. A sealing ring 42 is provided outside the cone, with at least two sealing rings 42. Preferably, two sealing rings 42 are provided, one located at different upper and lower positions outside the needle structure 4, with the lower sealing ring 42 having a smaller diameter than the upper sealing ring 42.

[0043] Furthermore, the design of the sealing ring 42 further prevents the liquid medicine from flowing out of the syringe 1 on the one hand, and increases the static friction between the needle structure 4 and the syringe 1 on the other hand. The sealing ring 42 is designed outside the needle structure 4 which is a cone. When the needle structure 4 is subjected to downward pressure, the greater the static friction, the less likely the needle structure 4 is to retract due to resistance. When the needle structure 4 is subjected to upward pulling force, the smaller the static friction, the easier it is for the needle structure 4 to be pulled back.

[0044] 2 , a drug liquid cavity 5 is formed between the sealing plug 3 and the needle structure 4. An injection cavity 44 connected to the drug liquid cavity 5 is provided at the upper end of the needle structure 4. The cross-section of the injection cavity 44 gradually increases from top to bottom, so that when the injection starts, the sealing plug 4 can slow down the larger liquid pressure caused by squeezing the drug liquid cavity 5 into the injection cavity 44, thereby buffering the pressure of the fluid at the needle port 45 on the human body environment during injection.

[0045] 2, the outside of the sealing plug 3 is provided with a plurality of sealing convex rings 31 that are interference fit with the inner wall of the syringe 1. The plurality of sealing convex rings 31 can increase the sealing performance of the sealing plug 3 and, on the other hand, reduce the friction resistance from the inner wall of the syringe 1 when the push rod 2 is pushed or pulled.

[0046] Preferably, referring to FIG. 2 , a guide conical surface 400 is formed between the first hook 40 and the upper end surface of the needle structure 4 , and the guide conical surface 400 makes it easier for the first hook 40 to be embedded into the first inner hole 301 .

[0047] 2 , a third hook 20 is provided at the lower end of the push rod 2, and an annular barb side 200 is formed on the outer side of the third hook 20. A third inner hole 303 cooperating with the third hook 20 is provided at the upper end of the sealing plug 3. The barb side 200 of the third hook 20 of the push rod 2 strengthens the tightness when the push rod 2 and the sealing plug 3 are matched.

[0048] Referring to Figure 4 , the syringe 1 includes a syringe cavity 10 in which the sealing plug 3 is located, and a needle cavity 11 in which the needle structure 4 is mounted. The inner diameter of the syringe cavity 10 is larger than that of the needle cavity 11, and a step surface 12 is formed between the syringe cavity 10 and the needle cavity 11. The needle structure 4 includes a needle 45. When the needle structure 4 is pulled into the syringe cavity 10, the needle structure 4 becomes deflected, and the distal end of the needle 45 abuts against the step surface 12 between the syringe cavity 10 and the needle cavity 11, preventing it from extending further, thus completing the self-destruction of the needle.

[0049] The use process and principle of this safety self-destruct syringe are as follows:

[0050] The aspiration and injection process of the syringe is the same as that of an ordinary syringe. When the injection is completed, first, the first hook 40 is embedded in the first inner hole 301 of the sealing plug 3, and the inclined surface 410 on the opposite side of the first hook 40 is abutted by the second convex ring 300. Referring to Figure 5, the inclined surface is subjected to a force, and there is an escape space 47 under the first hook 40 on the opposite side. The second convex ring 300 abuts against the first hook 40, so that the first hook 40 is firmly embedded in the first inner hole 301. At this time, the needle structure 4 has a tendency to tilt toward the direction of the first hook 40 (clockwise in Figure 5). Since the sealing plug 3 is elastic, as the sealing plug 3 continues to move downward, the second The hook 41 is embedded in the second inner hole 302 of the sealing plug 3, and the sealing plug 3 and the needle structure 4 are buckled together. Then, the push rod 2 is pulled up, and the sealing plug 3 drives the needle structure 4 to gradually move upward. The inclined surface 410 at the upper end (right side) of the needle structure 4 is subjected to the elastic force of the second convex ring 300, so that the needle structure 4 tilts around the intersection of the central axis and the upper end surface of the needle structure 4, causing the boss 43 of the needle structure 4 to disengage from the first convex ring 110 of the needle barrel 11, that is, the first convex ring 110 can no longer clamp the boss 43, so that the needle structure 4 can move upward, and finally the needle structure 4 is pulled up by the push rod 2 and smoothly retreats into the syringe cavity 10.

Claims

1. A safety self-destructing syringe, comprising a syringe (1), a push rod (2) arranged in the syringe (1), an elastic sealing plug (3) arranged at the lower end of the push rod (2) and connected thereto, and a needle structure (4) installed at the lower end of the syringe (1), characterized in that: The needle structure (4) comprises a first hook (40) arranged at the upper end, and a second hook (41) arranged below the first hook (40) and located on the opposite side, wherein an inclined surface (410) is formed between the second hook (41) and the upper end surface of the needle structure (4), and a first boss (43) is arranged directly below the same side of the second hook (41), and the inner wall of the syringe (1) is provided with a first convex ring (110) which can be clamped on the upper surface of the first boss (43) to limit the movement of the needle structure (4) toward the syringe (1), and the lower end of the sealing plug (3) is provided with a first inner hole which can cooperate with the first hook (40). (301), a second inner hole (302) capable of cooperating with the second hook (41) is provided below the first inner hole (301), a guide cone hole (304) is provided below the second inner hole (302), a second convex ring (300) is provided between the first inner hole (301) and the second inner hole (302), an escape space (47) capable of allowing the second convex ring (300) to abut against the bottom of the first hook (40) is provided below the first hook (40), and the second convex ring (300) can abut against the inclined surface (410), so that the central axis of the needle structure (4) and the central axis of the syringe are deviated.

2. A safety self-destructing syringe according to claim 1, characterized in that: The first hook (40) comprises a first barb (401) and a guide cone (400) arranged on the first barb (401), and the second hook (41) comprises a second barb (411) arranged at the lower end of the inclined surface (410).

3. A safety self-destructing syringe according to claim 1, characterized in that: A second boss (46) capable of abutting against the upper surface of the first convex ring (110) is provided directly below the same side of the avoidance space (47), and the second boss (46) can limit the needle assembly (4) from moving downward.

4. A safe self-destructing syringe according to claim 1, characterized in that: The needle structure (4) below the first boss (43) is in the form of a cone whose diameter gradually decreases from top to bottom. A sealing ring (42) is provided outside the cone, and there are at least two sealing rings (42).

5. A safe self-destructing syringe according to claim 1, characterized in that: A drug liquid cavity (5) is formed between the sealing plug (3) and the needle structure (4), and an injection cavity (44) communicating with the drug liquid cavity (5) is provided at the upper end of the needle structure (4), and the cavity cross-section of the injection cavity (44) gradually increases from top to bottom.

6. A safe self-destructing syringe according to claim 1, characterized in that: The sealing plug (3) is provided with a plurality of sealing convex rings (31) on the outside thereof which are interference-fitted with the inner wall of the syringe (1).

7. A safe self-destructing syringe according to claim 1, characterized in that: The lower end of the push rod (2) is provided with a third hook (20), the outer side of the third hook (20) forms an annular barbed side (200), and the upper end of the sealing plug (3) is provided with a third inner hole that cooperates with the third hook (20).

8. A safe self-destructing syringe according to claim 1, characterized in that: The syringe (1) comprises a syringe cavity (10) in which a sealing plug (3) is located and a needle cavity (11) in which a needle structure (4) is installed. The inner diameter of the syringe cavity (10) is larger than the inner diameter of the needle cavity (11), and a step surface (12) is formed between the syringe cavity (10) and the needle cavity (11).

9. A safety self-destructing syringe according to claim 8, characterized in that: The needle structure (4) comprises a needle (45). When the needle structure (4) is located in the syringe cavity (10), the step surface (12) can abut against the needle (45) to limit its downward movement.

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