Safety self-destructing syringe
The safety self-destructing syringe addresses sealing and retraction issues in conventional designs by employing a syringe body, plunger, and needle structure with latches and protrusions, ensuring safe and reliable needle retraction without lubricants, thus preventing leakage and exposure.
Patent Information
- Authority / Receiving Office
- KR · KR
- Patent Type
- Patents
- Current Assignee / Owner
- 루어 스춘
- Filing Date
- 2024-07-24
- Publication Date
- 2026-07-21
AI Technical Summary
Conventional self-destructing syringes face issues such as poor sealing, incomplete needle retraction, and structural complexity leading to potential leakage and needle exposure risks during injection and disposal.
A safety self-destructing syringe design featuring a syringe body, plunger, closing plug, and needle structure with latches and protrusions that ensure secure needle retraction and sealing, using elastic components and tilted axes to facilitate needle withdrawal without lubricants.
Enables safe and reliable needle retraction with minimal resistance, preventing leakage and exposure, while eliminating the need for lubricants, enhancing biocompatibility and reducing chemical residues.
Smart Images
Figure 112024137066902-PCT00001_ABST
Abstract
Description
Technology Field
[0001] The present invention relates to the field of syringe technology, and in particular to a safety self-destructing syringe. Background Technology
[0002] After the injection is completed by the syringe, the tip of the needle may be contaminated with the patient's body fluids or tissues, and because the tip is sharp, it is inconvenient to dispose of and handle, increasing the risk of infection or needle stick injury for medical staff and cleaning personnel.
[0003] Self-destructing syringes generally adopt a design in which the needle is retracted into the syringe body; injection is performed by pushing the closing plug with a plunger inside the syringe body, thereby compressing the closing plug to inject the medication into the needle, and a locking mechanism is installed at the front end of the closing plug to engage with the needle tip, so that the closing plug and needle are firmly coupled after the injection is completed, and when the plunger is pulled back, the closing plug pushes the needle, causing it to retract into the syringe body. This design inevitably presents a contradiction in use; during the injection process, the needle encounters resistance from skin tissue and tends to move into the syringe body, and if the needle retracts at this point, the medication may leak from the syringe body, potentially leading to a medical accident; On the other hand, after the injection is completed, the closing plug and the tip of the needle are firmly joined. At this time, the needle is pushed with a plunger to retract, but the pulling force must not be too great. First, the closing plug is generally made of silicone and cannot structurally withstand a large pulling force when joined with the needle. Second, the pulling force of the plunger must not be too great so that it is easy for medical staff to manipulate, and the static friction force to prevent the needle from retracting during the injection process must generally be greater than the pulling force of the plunger.
[0004] Conventional retractable automatic destruction syringes, in an attempt to balance the aforementioned contradictions, have a complex structure that makes it difficult to guarantee product quality and result in poor actual performance, leading to the following frequent problems:
[0005] 1. The sealing effect between the injection needle and the tip of the syringe body is poor, so the liquid medication is prone to leaking from the tip of the syringe body during the injection process.
[0006] 2. After the injection is completed with the needle, during the process of pulling the plunger back, the connection between the closing plug and the tip of the needle is not secure, so the needle cannot be pulled and retracted into the syringe body.
[0007] 3. When the injection needle is pulled back and retracted into the syringe body, the needle can easily be pushed forward by the plunger and pop out of the syringe body again, so complete self-destruction does not occur. The problem to be solved
[0008] In light of this, the objective of the present invention is to provide a safe self-destructing syringe that enables safe injection and features the ability to easily retract the injection needle into the syringe body and self-destruct. means of solving the problem
[0009] The present invention adopts the following technical solution to solve these technical problems.
[0010] A safety self-destructing syringe comprises a syringe body, a plunger installed inside the syringe, a closing plug having elasticity installed at the bottom of the plunger, and a syringe needle structure mounted at the bottom of the syringe body. The syringe needle structure comprises a first latch installed at the top and a second latch installed below the first latch and facing it. An inclined surface is formed between the second latch and the upper surface of the syringe needle. A first protrusion is installed immediately below the same side as the second latch. A first protrusion ring is installed on the inner wall of the syringe body to engage with the protrusion and restrict the movement of the syringe needle structure toward the syringe body. A first internal hole capable of engaging with the first latch is installed at the bottom of the closing plug. A second internal hole capable of engaging with the second latch is installed below the first internal hole. A second protrusion ring is installed between the first internal hole and the second internal hole. An avoidance space is formed below the first latch so that the second protrusion ring can come into contact with the bottom of the first latch. The second protrusion ring can come into contact with the inclined surface, thereby the syringe needle structure Make sure the central axis and the central axis of the syringe body are tilted.
[0011] The injection needle structure below the above-mentioned protrusion forms a conical shape with a diameter that gradually decreases from top to bottom, and a sealing ring is installed on the outside of the conical shape, and there are at least two sealing rings.
[0012] A liquid medicine cavity is formed between the closing plug and the injection needle structure, and an injection cavity communicating with the liquid medicine cavity is installed at the top of the injection needle structure, and the cross-sectional area of the injection cavity gradually increases from top to bottom.
[0013] A small sealing protrusion ring is installed on the outside of the above closing plug to form an interference fit with the inner wall of the syringe body.
[0014] A guide conical surface is formed between the first latch and the upper cross-section of the injection needle structure.
[0015] A third latch is installed at the bottom of the above-mentioned push rod, an annular bar side is formed on the outer side of the above-mentioned third latch, and a third inner hole that engages with the third latch is installed at the top of the above-mentioned closing plug.
[0016] The above syringe body includes a syringe body cavity where a closing plug is located and a syringe needle cavity equipped with a syringe needle structure, the inner diameter of the syringe body cavity is larger than the inner diameter of the syringe needle cavity, and a stepped surface is formed between the syringe body cavity and the syringe needle cavity.
[0017] The above injection needle structure includes an injection needle, and when the injection needle structure is positioned within the syringe body cavity, a stepped surface may come into contact with the injection needle, thereby restricting it from moving downward. Effects of the invention
[0018] The advantageous effects of the present invention are included as follows.
[0019] 1. The suction and injection process of this syringe is identical to that of a standard syringe. After the injection is completed, the first latch is first inserted into the first inner hole of the closing plug, and the inclined surface located opposite the first latch comes into contact with the second protruding ring, where the inclined surface receives force. A clearance space is provided below the first latch on the opposite side, and the second protruding ring comes into contact below the first latch, causing the first latch to be firmly inserted into the first inner hole. At this time, the injection needle structure tends to tilt toward the direction of the first latch, and since the closing plug has elasticity, as the closing plug continues to move downward, the second latch is inserted into the second inner hole of the closing plug, and the closing plug and the injection needle structure are fitted together. Subsequently, when the plunger is pulled upward, the closing plug gradually moves the injection needle structure upward, and the inclined surface on the upper (right) side of the injection needle structure receives elasticity by coming into contact with the second protruding ring, causing the injection needle structure to tilt at the intersection of the central axis and the upper surface of the injection needle structure. Consequently, The protrusion of the injection needle structure is disengaged from the first protrusion ring of the injection needle cavity, that is, the first protrusion ring is no longer caught on the protrusion, allowing the injection needle structure to move upward, and consequently, the injection needle structure smoothly retracts into the syringe body cavity as the plunger is pulled upward.
[0020] The advantages of this design are as follows: first, the design of the protrusion and the first protrusion ring effectively prevents the needle from retracting due to resistance from the skin and tissue during the injection process, thereby enabling safe injection; second, the first and second latches ensure a tight connection between the closing plug and the needle structure during the pushing and pulling of the plunger; and third, it resolves the inconsistencies in the usage process that occur in conventional retractable self-destructing syringes, so that the needle does not retract while withstanding relatively large resistance from the skin and tissue during the injection process, and after the injection is completed, the needle can be automatically destroyed by pulling it with a small pulling force.
[0021] 2. During the retraction process of the injection needle structure, the optimized design of the injection needle structure and the closing plug allows the injection needle structure to easily form a stable coupling relationship with the closing plug, and this process can be implemented even in situations where lubricant or silicone oil is not required; additionally, during the process of the injection needle structure pulling the plunger, the protrusion of the injection needle structure is disengaged from the first protrusion ring of the injection needle cavity, that is, the first protrusion ring is no longer caught on the protrusion, allowing the injection needle structure to move upward and easily separate from the injection needle cavity, and this optimization of the structure also allows this process to be easily accomplished without lubricant or silicone oil.
[0022] Each component of this safety self-destructing syringe is completely free from the lubrication of lubricants or silicone oil, allowing each operation to be completed smoothly; furthermore, the removal of silicone oil from the syringe not only reduces potential chemical residues but also significantly improves the biocompatibility of the product by decreasing the risk of biological reactions that such substances may cause.
[0023] 3. The first barb tightly connects the first latch and the first inner hole, and the second barb tightly connects the second latch and the second inner hole, and the guide conical surface formed between the first latch and the upper cross-section of the injection needle structure allows the first latch to be inserted into the first inner hole relatively easily.
[0024] 4. The second protrusion is in contact with the upper surface of the first protrusion ring to restrict the downward movement of the injection needle structure, thereby preventing the injection needle structure from disengaging from the injection needle cavity.
[0025] 5. The design of the sealing ring prevents the liquid from flowing out of the syringe on one hand, and increases the static friction between the needle structure and the syringe body on the other. The sealing ring is designed on the outside of the conical needle structure. When pressure is applied to the needle structure, the greater the static friction, the more difficult it is for the needle structure to retract due to resistance. When a pulling force is applied to the needle structure, the smaller the static friction, the easier it is for the needle structure to be pulled.
[0026] 6. The cavity volume of the injection cavity gradually increases from top to bottom, and when the injection is started, the closing plug compresses the liquid cavity to relieve the relatively large liquid pressure flowing into the injection cavity, thereby buffering the pressure exerted by the fluid of the injection needle on the internal environment of the human body during injection.
[0027] 7. A small sealing protrusion ring can increase the sealing performance of the closing plug, and on the other hand, reduce frictional resistance from the inner wall of the syringe body when pushing and pulling the plunger, allowing the pushing and pulling of the plunger to be performed easily without the action of silicone, thereby enabling the removal of silicone oil from the syringe.
[0028] 8. The barb side of the third latch of the pusher strengthens the degree of tightness when the pusher and the closing plug are joined.
[0029] 9. When the injection needle structure is pulled into the syringe body cavity, the injection needle structure becomes tilted, so that the tip of the injection needle comes into contact with the stepped surface of the syringe body cavity and the injection needle cavity, preventing it from protruding further, thereby completing the self-destruction of the injection needle. Brief explanation of the drawing
[0030] Figure 1 is a cross-sectional view of the present safety self-destructing syringe. Figure 2 is a partial cross-sectional view of the safety self-destructing syringe. Figure 3 is a schematic diagram of the structure of a syringe needle. Figure 4 is a partial cross-sectional view of the syringe body. Figure 5 is a partial cross-sectional view when the closing plug and injection needle structure are combined. Figure 6 is a cross-sectional view of the injection needle structure moving into the syringe body as the closing plug is pulled. Specific details for implementing the invention
[0031] In order to clarify the technical problem to be solved by the present invention, the technical solution adopted, and the technical effect achieved, the technical solution of the present invention is further explained below by combining the drawings and specific details for implementing the invention. It should be understood that the specific embodiments described herein are merely for the purpose of interpreting the present invention and are not intended to limit the invention. Furthermore, for convenience of explanation, only parts related to the present invention are shown in the drawings, and the whole is not shown, as further explanation is required.
[0032] Referring to FIGS. 1, 2 and 4, the present invention provides a safety self-destructing syringe, comprising a syringe body (1), a plunger (2) installed within the syringe body (1), an elastic closing plug (3) installed at the bottom of the plunger (2) and connected thereto, and a syringe needle structure (4) mounted at the bottom of the syringe body (1). The syringe needle structure (4) comprises a first latch (40) installed at the top and a second latch (41) installed below the first latch (40) and facing it. An inclined surface (410) is formed between the second latch (41) and the top surface of the syringe needle structure (4). A protrusion (43) is installed directly below the same side as the second latch (41). A first protrusion ring (110) is installed on the inner wall of the syringe body (1) to catch on the protrusion (43) and restrict the movement of the syringe needle structure (4) toward the syringe body (1). At the bottom of the closing plug (3), a first A first inner hole (301) capable of being coupled with a latch (40) is installed, and a second inner hole (302) capable of being coupled with a second latch (41) is installed below the first inner hole (301), and a second protruding ring (300) is installed between the first inner hole (301) and the second inner hole (302), and an avoidance space (47) is formed below the first latch (40) so that the second protruding ring (300) can be in contact with the first latch (40), and the second protruding ring (300) is in contact with an inclined surface (410) so that the central axis of the injection needle structure (4) and the central axis of the syringe body (1) are tilted.
[0033] Furthermore, the design of the protrusion (43) and the first protrusion ring (110) effectively prevents the injection needle from retracting due to resistance from the skin and tissue during the injection process, thereby enabling safe injection; the first latch (40) and the second latch (41) can ensure a tight connection between the closing plug (3) and the injection needle structure (4) during the process of pulling the plunger (2); and the present safety self-destructing syringe resolves the inconsistencies in the usage process that occur in conventional retractable self-destructing syringes, so that the injection needle does not retract while withstanding relatively large resistance from the skin and tissue during the injection process, and after the injection is completed, the retraction and self-destruction of the injection needle can be completed by pulling the injection needle with a small pulling force.
[0034] Referring to FIG. 2 or FIG. 3, the first latch (40) includes a first barb (401) and a guide conical surface (400) installed on the first barb (401), and the second latch (41) includes a second barb (411) installed at the bottom of the inclined surface (410).
[0035] Referring to FIG. 2, a second protrusion (46) is installed directly below the same side as the avoidance space (47) and can be in contact with the upper surface of the first protrusion ring (110). The second protrusion (46) restricts the downward movement of the injection needle structure (4), thereby preventing the injection needle structure (4) from coming out of the injection needle cavity (11).
[0036] Referring to FIG. 3, the injection needle structure (4) below the protrusion (43) forms a cone shape with a diameter that gradually decreases from top to bottom, and a sealing ring (42) is installed on the outside of the cone shape, and there are at least two sealing rings (42). Preferably, two sealing rings (42) are installed, each installed at a different upper and lower position on the outside of the injection needle structure (4), and the diameter of the sealing ring (42) installed on the lower side is smaller than that of the sealing ring (42) installed on the upper side.
[0037] Furthermore, the design of the sealing ring (42) prevents the liquid medicine from flowing out of the syringe body (1) on one hand, and increases the static friction between the injection needle structure (4) and the syringe body (1) on the other. The sealing ring (42) is designed on the outside of the conical injection needle structure (4). When pressure is applied to the injection needle structure (4), the greater the static friction, the more difficult it is for the injection needle structure (4) to retract due to resistance, and when a pulling force is applied to the injection needle structure (4), the smaller the static friction, the easier it is for the injection needle structure (4) to be pulled.
[0038] Referring to FIG. 2, a liquid medicine cavity (5) is formed between the closing plug (3) and the injection needle structure (4), and an injection cavity (44) connected to the liquid medicine cavity (5) is installed at the top of the injection needle structure (4). The cross-sectional area of the injection cavity (44) gradually increases from top to bottom, so that when the injection is started, the closing plug (4) compresses the liquid medicine cavity (5) to relieve the relatively large liquid pressure flowing into the injection cavity (44), thereby buffering the pressure exerted by the fluid of the injection needle (45) on the internal environment of the human body during injection.
[0039] Referring to FIG. 2, a small sealing protrusion ring (31) is installed on the outside of the closing plug (3) to form an interference fit with the inner wall of the syringe body (1). The small sealing protrusion ring (31) can increase the sealing performance of the closing plug (3) and, on the other hand, reduce frictional resistance from the inner wall of the syringe body (1) when pushing and pulling the plunger (2).
[0040] Preferably, referring to FIG. 2, a guide cone surface (400) is formed between the first latch (40) and the upper cross section of the injection needle structure (4), and the guide cone surface (400) allows the first latch (40) to be easily fitted into the first inner hole (301).
[0041] Referring to FIG. 2, a third latch (20) is installed at the bottom of the pusher (2), and an annular bar side (200) is formed on the outside of the third latch (20). A third inner hole (303) that is coupled with the third latch (20) is installed at the top of the closing plug (3), and the bar side (200) of the third latch (20) of the pusher (2) strengthens the degree of contact when the pusher (2) and the closing plug (3) are coupled.
[0042] Referring to FIG. 4, the syringe body (1) includes a syringe body cavity (10) in which a closing plug (3) is located and a syringe needle cavity (11) equipped with a syringe needle structure (4). The inner diameter of the syringe body cavity (10) is larger than that of the syringe needle cavity (11), and a step surface (12) is formed between the syringe body cavity (10) and the syringe needle cavity (11). The syringe needle structure (4) includes a syringe needle (45). When the syringe needle structure (4) is pulled into the syringe body cavity (10), the syringe needle structure (4) takes on a tilted shape, so that the tip of the syringe needle (45) comes into contact with the step surface (12) between the syringe body cavity (10) and the syringe needle cavity (11), preventing it from protruding further and completing the automatic destruction of the syringe needle.
[0043] The usage process and principle of this safety self-destruct syringe are as follows:
[0044] The suction and injection process of the syringe is the same as that of a standard syringe. After the injection is completed, first, the first latch (40) is inserted into the first inner hole (301) of the closing plug (3), and the inclined surface (410) located opposite the first latch (40) comes into contact with the second protruding ring (300). Referring to FIG. 5, the inclined surface receives force, and an avoidance space (47) is provided below the first latch (40) on the opposite side. The second protruding ring (300) comes into contact below the first latch (40), causing the first latch (40) to be firmly inserted into the first inner hole (301). At this time, the injection needle structure (4) tends to tilt in the direction of the first latch (40) (clockwise in FIG. 5), and since the closing plug (3) has elasticity, when the closing plug (3) continues to move downward, the second latch (41) of the closing plug (3) When the closing plug (3) and the injection needle structure (4) are fitted into the second inner hole (302), and then the pusher (2) is pulled upward, the closing plug (3) gradually moves the injection needle structure (4) upward, and the inclined surface (410) on the upper (right) side of the injection needle structure (4) receives elasticity that contacts the second protruding ring (300), causing the injection needle structure (4) to tilt at the intersection of the central axis and the upper surface of the injection needle structure (4). As a result, the protrusion (43) of the injection needle structure (4) is disengaged from the first protruding ring (110) of the injection needle cavity (11), that is, the first protruding ring (110) is no longer caught on the protrusion (43), allowing the injection needle structure (4) to move upward, and eventually, as the pusher (2) is pulled upward, the injection needle structure (4) smoothly retracts into the syringe body cavity (10).
Claims
Claim 1 A safety self-destructing syringe comprising a syringe body (1), a plunger (2) installed within the syringe body (1), an elastic closing plug (3) installed at the bottom of the plunger (2) and connected thereto, and a syringe needle structure (4) mounted at the bottom of the syringe body (1), wherein the syringe needle structure (4) includes a first latch (40) installed at the top and a second latch (41) installed below the first latch (40) and facing it, wherein an inclined surface (410) is formed between the second latch (41) and the top surface of the syringe needle structure (4), a first protrusion (43) is installed directly below the same side as the second latch (41), and a first protrusion ring (110) is installed on the inner wall of the syringe body (1) to catch on the upper surface of the first protrusion (43) and restrict the movement of the syringe needle structure (4) toward the syringe body (1), and a first inner part capable of being coupled with the first latch (40) is installed at the bottom of the closing plug (3). A safety automatic destruction syringe characterized by a hole (301) being installed, a second inner hole (302) being installed below the first inner hole (301) so as to be coupled with a second latch (41), a guide cone hole (304) being installed below the second inner hole (302), a second protruding ring (300) being installed between the first inner hole (301) and the second inner hole (302), an avoidance space (47) being formed below the first latch (40) so that the second protruding ring (300) can be contacted below the first latch (40), and the second protruding ring (300) being contacted on an inclined surface (410) so as to cause the central axis of the injection needle structure (4) and the central axis of the syringe body to be tilted. Claim 2 A safety automatic destruction syringe according to claim 1, wherein the first latch (40) comprises a first barb (401) and a guide conical surface (400) installed on the first barb (401), and the second latch (41) comprises a second barb (411) installed at the bottom of an inclined surface (410). Claim 3 A safety automatic destruction syringe according to claim 1, characterized in that a second protrusion (46) is installed directly below the same side as the avoidance space (47) and can be in contact with the upper surface of the first protrusion ring (110), and the second protrusion (46) can restrict the downward movement of the injection needle structure (4). Claim 4 A safety automatic self-destructing syringe according to claim 1, wherein the injection needle structure (4) below the first protrusion (43) forms a cone shape with a diameter that gradually decreases from top to bottom, and a sealing ring (42) is installed on the outside of the cone shape, and the sealing ring (42) is at least two. Claim 5 A safety self-destructing syringe according to claim 1, wherein a liquid medicine cavity (5) is formed between the closing plug (3) and the injection needle structure (4), an injection cavity (44) connected to the liquid medicine cavity (5) is installed at the top of the injection needle structure (4), and the cross-sectional area of the cavity of the injection cavity (44) gradually increases from top to bottom. Claim 6 A safety self-destructing syringe according to claim 1, characterized in that a small sealing protrusion ring (31) is installed on the outside of the closing plug (3) to form an interference fit with the inner wall of the syringe body (1). Claim 7 A safety automatic destruction syringe according to claim 1, characterized in that a third latch (20) is installed at the bottom of the push rod (2), an annular bar side (200) is formed on the outside of the third latch (20), and a third inner hole that is coupled with the third latch (20) is installed at the top of the closing plug (3). Claim 8 A safety self-destructing syringe according to claim 1, wherein the syringe body (1) comprises a syringe body cavity (10) in which a closing plug (3) is located and a syringe needle cavity (11) equipped with a syringe needle structure (4), the inner diameter of the syringe body cavity (10) is larger than the inner diameter of the syringe needle cavity (11), and a stepped surface (12) is formed between the syringe body cavity (10) and the syringe needle cavity (11). Claim 9 In claim 8, the injection needle structure (4) includes an injection needle (45), and when the injection needle structure (4) is positioned within the syringe body cavity (10), the step surface (12) can come into contact with the injection needle (45) and is restricted from moving downward, characterized in that it is a safety self-destructing syringe.