A needle-destroyable safety syringe
By integrating a self-destruct mechanism into the syringe, the needle is automatically locked in place, solving the problems of accidental injury caused by exposed needles in traditional syringes and the easy failure of existing self-destruct mechanisms, thus achieving a safe and reliable self-destruct effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CHENGDU HENGWEIKANG MEDICAL TECHNOIOGY CO LTD
- Filing Date
- 2026-04-27
- Publication Date
- 2026-07-31
AI Technical Summary
Traditional syringes expose the needle after use, which can easily lead to accidental needle prick injuries. Existing self-destruct mechanisms are prone to failure during transportation and have complex structures.
A self-destruct mechanism was designed, comprising a fixed post, a spring, a connecting block, a rebound assembly, a limiting assembly, a closing assembly, and a self-locking assembly. The movement of the push rod automatically triggers the needle to lock and close. The mechanism is integrated inside the syringe body and the push rod to ensure automatic self-destruction after use.
It achieves automatic needle locking after injection to avoid accidental exposure, has high structural stability, avoids accidental triggering during transportation, and reduces occupational exposure risk.
Smart Images
Figure CN122479255A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of syringe technology, and more particularly to a safety syringe with a self-destructible needle. Background Technology
[0002] A syringe is a medical device used to draw, push, or inject liquid drugs or other fluid media. It typically consists of a barrel, a piston rod, a needle, and matching connectors. By changing the volume of the inner cavity of the barrel, it can achieve negative pressure aspiration and positive pressure injection. It is widely used in clinical injection, drug extraction, sample collection, and other medical operations.
[0003] After use, the needles of traditional syringes are directly exposed to the external environment without any effective shielding or locking protection. After clinical procedures, medical staff must manually sort the used syringes into special medical waste containers. During this process, if the operation is not careful, the containers are not placed properly, or the syringes are collided and the needles become misaligned, needle stick accidents are very likely to occur. In the transportation of medical waste, the containers carrying syringes may be bumped or tipped over, causing the needles to puncture the outer wall of the container and cause accidental injury to the transport personnel. In the final centralized disposal stage, waste disposal personnel face a large number of messy piles of discarded syringes during sorting, crushing, and incineration, and the risk of being pricked by exposed needles is greatly increased. Such accidental needlestick injuries not only cause direct skin and flesh damage to operators, leading to immediate problems such as pain and infection, but more importantly, the needles of discarded syringes often retain the patient's blood, bodily fluids, and various pathogenic microorganisms. Once the skin is punctured, bloodborne pathogens such as hepatitis B virus, hepatitis C virus, and HIV will directly enter the body, causing serious occupational exposure. This not only poses a fatal threat to the operator's health but may also lead to subsequent medical treatment.
[0004] A series of issues, such as psychological intervention, increase medical costs and the burden of public health management, while also bringing long-term health risks and psychological stress to relevant personnel.
[0005] Currently, the few syringes on the market with self-destruct functions often have complicated and cumbersome self-destruct mechanisms. During transportation, the syringes need to undergo long-distance bumps, compression, and other complex conditions, which can easily lead to deviations in the assembly precision of the self-destruct mechanism, or even loosening or falling off of components, thus causing the self-destruct mechanism to fail prematurely or fail to trigger properly.
[0006] To address this, we propose a safety syringe with a self-destructing needle. Summary of the Invention
[0007] The purpose of this invention is to solve the problems in the prior art by proposing a safe syringe with a self-destructing needle.
[0008] To achieve the above objectives, the present invention adopts the following technical solution: a safety syringe with a self-destructible needle, comprising a syringe body, a plunger, a self-destruct mechanism, and a needle, wherein the plunger is slidably connected to the syringe body; the needle is mounted on the bottom wall of the syringe body; the self-destruct mechanism comprises a fixing post, a first spring, a connecting block, a rebound assembly, a limiting assembly, a closing assembly, and a self-locking assembly; the fixing post is mounted inside the plunger; one end of the first spring is fixed to the bottom wall of the fixing post; the connecting block is connected to the other end of the first spring; the rebound assembly is disposed at the other end of the first spring; the limiting assembly is disposed inside the plunger; the closing assembly is disposed inside the syringe body; and the self-locking assembly is disposed on the syringe body.
[0009] In the aforementioned self-destructible safety syringe, the rebound assembly includes a first locking block, a push rod, a second spring, and a connecting rod, wherein the first locking block is slidably connected to...
[0010] The connecting block is inside; the push post is fixed to the outer wall of the first locking block; the second spring is sleeved on the outside of the push post, and one end of the second spring is fixed to the outer wall of the first locking block; the connecting rod is connected to the other end of the push post.
[0011] In the aforementioned self-destructible safety syringe, the limiting assembly includes a third spring and a limiting block, wherein one end of the third spring is fixed inside the push rod; and the limiting block is connected to the other end of the third spring.
[0012] In the aforementioned self-destructible safety syringe, the closing assembly includes a closing block, a fourth spring, and a closing plate. The closing block is installed inside the syringe body. Two fourth springs are provided, with one end of each spring fixed inside the syringe body. Two closing plates are provided, each connected to the other end of a corresponding fourth spring.
[0013] In the aforementioned self-destructible safety syringe, the self-locking assembly is provided in two sets. Each set of the self-locking assembly includes a fixing block, a fifth spring, and a second locking block. The fixing block is fixed to the syringe body; one end of the fifth spring is fixed to the inner wall of the fixing block; and the second locking block is connected to the other end of the fifth spring.
[0014] In the aforementioned self-destructible safety syringe, a protective component is provided at the bottom of the syringe body. The protective component includes a protective block, a threaded block, a protective sleeve, and a knob. The protective block is fitted over the outside of the needle; the threaded block is installed inside the protective block; the protective sleeve is fitted over the outside of the needle; and the knob is installed on the outer wall of the protective sleeve.
[0015] In the aforementioned self-destructible safety syringe, the plunger is equipped with an anti-slip component, which includes an anti-slip block and an anti-slip pad.
[0016] The block is mounted on the push rod; the anti-slip pad is fixed to the anti-slip block.
[0017] Compared with existing technologies, the advantages of this invention are as follows: 1. Through the setting of the self-destruct mechanism, after the injection is completed and the push rod is pushed to the bottom, the connecting block will be ejected by the elastic force of the first spring, and the push rod will be driven to move in conjunction with the rebound component, so that the connecting block is locked into the self-locking component. At the same time, the connecting rod will push the two closing plates to overcome the elastic force of the fourth spring and move towards the middle, sealing the channel connecting the needle and the syringe body, and realizing the locking and sealing of the needle. The self-destruct mechanism can be automatically triggered after the injection is completed, without the need for additional manual operation, which can effectively prevent the needle from being exposed after use, and reduce the risk of needle puncture accidents from the root.
[0018] 2. The self-destruct mechanism of the present invention is integrated inside the syringe body and the plunger. When not in use, all components of the self-destruct mechanism are in a stable limited state and will not loosen or be accidentally triggered due to bumps or squeezing during transportation. This ensures the structural stability of the self-destruct mechanism before use. Self-destruction is only triggered stably after the plunger is pushed to the bottom to complete the injection. This solves the problem of complex structure and premature failure of existing self-destruct syringes. Attached Figure Description
[0019] Figure 1 is a schematic diagram of the operation of a safety syringe with a self-destructible needle proposed in this invention;
[0020] Figure 2 is a schematic diagram of the closed-end assembly structure of a self-destructible safety syringe proposed in this invention;
[0021] Figure 3 is a schematic cross-sectional view of the push rod of a safety syringe with a self-destructing needle.
[0022] Figure 4 is a partial enlarged view of point A in Figure 3 proposed in this invention;
[0023] Figure 5 is a schematic diagram of the structure of the plunger and needle of a safety syringe with self-destructible needle proposed in this invention.
[0024] Figure 6 is Figure 5 A partial enlarged view at point B in the middle shows a schematic diagram of the self-locking component structure of a safety syringe with a self-destructible needle, as proposed in this invention.
[0025] Figure 7 is a schematic diagram of the protective component structure of a safety syringe with a self-destructible needle proposed in this invention;
[0026] Figure 8 is a schematic diagram of the structure of the syringe body and the plunger of a safety syringe with self-destructible needle proposed in this invention.
[0027] Figure 9 is a schematic diagram of the structure of a safety syringe connector block with self-destructible needle and a push rod proposed in this invention.
[0028] Figure 10 is a schematic diagram of the structure of a self-destructing safety syringe rebound assembly proposed in this invention.
[0029] In the diagram: 1. Syringe body; 2. Push rod; 3. Self-destruct mechanism; 31. First spring; 32. Connecting block; 33. Rebound assembly; 331. First locking block; 332. Push post; 333. Second spring; 334. Connecting rod; 34. Limiting assembly; 341. Third spring; 342. Limiting block; 4. Closing assembly; 41. Closing block; 42. Fourth spring; 43. Closing plate; 5. Self-locking assembly; 51. Fixing block; 52. Fifth spring; 53. Second locking block; 6. Needle; 7. Protective assembly; 71. Protective block; 72. Threaded block; 73. Protective sleeve; 74. Knob; 8. Anti-slip assembly; 81. Anti-slip block; 82. Anti-slip pad; 9. Fixing post. Detailed Implementation
[0030] The following examples are for illustrative purposes only and are not intended to limit the scope of the invention. Examples
[0031] As shown in Figures 1-9, an embodiment of this application provides a self-destructing safety syringe, comprising a syringe body 1, a plunger 2, a self-destruct mechanism 3, and a needle 6. The plunger 2 is slidably connected to...
[0032] In the syringe body 1, the needle 6 is installed on the bottom wall of the syringe body 1. The self-destruct mechanism 3 includes a fixing post 9, a first spring 31, a connecting block 32, a rebound assembly 33, a limiting assembly 34, a closing assembly 4, and a self-locking assembly 5.
[0033] The fixed post 9 is installed inside the push rod 2. One end of the first spring 31 is fixed to the bottom wall of the fixed post 9. The connecting block 32 is connected to the other end of the first spring 31. The rebound assembly 33 is located at the other end of the first spring 31. The limiting assembly 34 is located inside the push rod 2. The closing assembly 4 is located inside the syringe body 1. The self-locking assembly 5 is located on the syringe body 1.
[0034] As shown in Figure 5, in one embodiment of this application, the springback assembly 33 includes a first locking block 331, a push post 332, a second spring 333, and a connecting rod 334.
[0035] The first locking block 331 is slidably connected inside the connecting block 32, the push post 332 is fixed to the outer wall of the first locking block 331, the second spring 333 is sleeved on the outside of the push post 332, one end of the second spring 333 is fixed to the outer wall of the first locking block 331, and the connecting rod 334 is connected to the other end of the push post 332.
[0036] As shown in Figure 5, in one embodiment of this application, the limiting component 34 includes a third spring 341 and a limiting block 342.
[0037] One end of the third spring 341 is fixed inside the push rod 2, and the limiting block 342 is connected to the other end of the third spring 341.
[0038] It should be noted that the first spring 31 described in this embodiment is initially in a stretched state, and the limiting component 34 is initially in a state where the limiting block 342 pops out and locks the connecting block 32 to prevent it from rebounding.
[0039] Specifically, when the plunger 2 is pushed to the inner bottom wall of the syringe body 1, the first locking block 331...
[0040] The first locking block 331 will come into contact with the hole inside the protective block 71. At this time, the first locking block 331 compresses the second spring 333 and retracts into the connecting block 32. Then, under the elastic force of the second spring 333, the first locking block 331 will be ejected and enter the hole in the protective block 71. During the process of entering the hole, the push post 332 fixed on the side wall of the first locking block 331 will move and push the connecting rod 334 towards the limiting block 342. Then, the connecting rod 334 pushes the limiting block 342 to compress the second spring 333, so that the limiting block 342 retracts into the syringe body 1. At this time, due to the loss of the limitation of the limiting block 342, the first spring 31, due to the spring's contraction force, pulls the entire connecting block 32 into the push rod 32, thereby causing the entire needle 6 to spring back towards the tail end of the syringe body 1, so that the needle 6 is completely retracted into the push rod 2, completing the concealment of the needle and preventing the needle from being exposed and causing puncture.
[0041] like Figure 2 Figure 3 and Figure 9 As shown, in one embodiment of this application, the closed component
[0042] 4 includes a closed block 41, a fourth spring 42, and a closing plate 43.
[0043] The closing block 41 is installed inside the syringe body 1. There are two fourth springs 42, one end of each fourth spring 42 is fixed inside the syringe body 1. There are two closing plates 43, each of which is connected to the other end of the corresponding fourth spring 42.
[0044] It should be noted that the path of the fourth spring 42 described in this embodiment corresponds to the radius of the closing plate 43. In the initial state, the closing plate 43 is squeezed open by the upper end of the needle 6, compressing the fourth spring 42 and locking it inside the closing block 41.
[0045] Specifically, after the push rod 2 drives the needle 6 to fully retract, the two closing plates 43, which were originally pushed open by the side wall of the protective block 71, are pushed inward by the elastic force of the fourth spring 42, closing and sealing the opening of the syringe body for the needle to extend, thus completely blocking the retracted needle.
[0046] The needle is enclosed inside the syringe body to further prevent it from protruding from the opening and injuring the operator.
[0047] As shown in Figure 7, in one embodiment of this application, the self-locking component 5 is provided in two sets, each set of self-locking components 5 including a fixing block 51, a fifth spring 52 and a second locking block 53.
[0048] The fixing block 51 is fixed to the syringe body 1, one end of the fifth spring 52 is fixed to the inner wall of the fixing block 51, and the second locking block 53 is connected to the other end of the fifth spring 52.
[0049] Specifically, when medical staff push the plunger 2 to the needle end of the syringe body 1, the plunger...
[0050] The connecting block on 2 will squeeze the second locking block 53. The second locking block 53 compresses the fifth spring 52 and retracts. After the connecting block has completely moved to the other side of the second locking block 53, the fifth spring 52 rebounds and pushes the second locking block 53 to reset, locking and limiting the connecting block 32 and the push rod 2 as a whole, preventing the push rod 2 from sliding outward again, ensuring that the push rod 2 is always closed inside the syringe body, realizing stable self-destruct locking, and preventing the self-destruct state from failing.
[0051] like Figure 8 As shown, in one embodiment of this application, a protective component 7 is provided at the bottom of the syringe body 1.
[0052] The protective component 7 includes a protective block 71, a threaded block 72, a protective sleeve 73, and a knob 74.
[0053] The protective block 71 is fitted over the outside of the needle 6, and the threaded block 72 is installed on the protective block.
[0054] Inside 71, a protective sleeve 73 is fitted over the outside of the needle 6, and a knob 74 is mounted on the protective sleeve.
[0055] The outer wall of 73.
[0056] Specifically, before use, the protective sleeve 73 protects the needle 6, preventing contamination of the needle when not in use and preventing accidental scraping of the needle against the operator. Rotating the knob 74 causes the protective sleeve 73 to rotate relative to the threaded block 72, thus unscrewing the protective sleeve 73.
[0057] It is easy and convenient to remove.
[0058] As shown in Figure 1, in one embodiment of this application, the push rod 2 is provided with an anti-slip component 8.
[0059] The anti-slip component 8 includes an anti-slip block 81 and an anti-slip pad 82.
[0060] The anti-slip block 81 is mounted on the push rod 2, and the anti-slip pad 82 is fixed on the anti-slip block 81.
[0061] Specifically, the anti-slip block 81 can increase the friction on the surface of the push rod 2, and the anti-slip pad further improves the friction effect. When medical staff push the push rod, their hands are less likely to slip, which can better control the injection force and improve the stability of the injection operation.
[0062] Working principle: When using the syringe body 1 for injection, manually pull the push rod 2 backward. The push rod 2 moves smoothly backward inside the syringe body 1, and the liquid medicine is drawn out by the negative pressure structure at the end of the push rod to complete the filling of the medicine. At this time, all the limit springs, locking blocks and connecting structures inside the equipment are in the initial stable limit state, and the components do not interfere with each other.
[0063] After the injection is completed, push rod 2 is continuously pushed forward until the end of push rod 2 near needle 6 reaches its limit stroke position. During this process, connecting block 32 moves forward synchronously with push rod 2. First locking block 331 first contacts the inner wall of protective block 71 and is subjected to a hard compressive force. After being subjected to force, first locking block 331 compresses second spring 333 inward. Second spring 333 is compressed and deformed, and first locking block 331 is completely retracted into the internal cavity of connecting block 32, completing the clearance action. When push rod 2 is pushed to the limit position, first locking block 331 aligns with the preset internal hole of protective block 71. The external compressive force disappears, and the compressed and deformed second spring 333 releases its elastic potential energy, extends outward and resets, pushing first locking block 331 outward and locking into the hole of protective block 71, realizing structural locking and fixing, thereby completing the front-end mechanical linkage trigger.
[0064] After the first locking block 331 is engaged and fixed in the hole of the protective block 71, the overall position is locked, and the axial force is then transmitted to the push column 332. The push column 332 is pushed forward and displaced, rigidly pushing the connecting rod 334 to move laterally. The end of the connecting rod 334 abuts against the limiting block 342, and the lateral thrust forces the limiting block 342 to retract inward. The limiting block 342 compresses the third spring 341, causing it to deform. The limiting block 342 is completely hidden and retracted into the internal structure of the push rod 2. The limiting structure that was originally fixed by the limiting block 342 is completely released, eliminating the binding resistance of the first spring 31.
[0065] After the limiting block 342 retracts and unlocks, the first spring 31, which was previously stretched and in a tensioned state, instantly loses its limiting constraint. The first spring 31 quickly contracts elastically and rebounds axially, generating a stable tension. The tension acts directly on the connecting block 32, causing the connecting block 32 and the needle 6 fixed at its end to move backward at a uniform speed, smoothly retracting and retracting into the push rod 2 and the syringe body 1, achieving complete concealment of the sharp needle.
[0066] The closing assembly 4 is activated simultaneously the instant the needle 6 is fully retracted into the syringe body 1. The two sets of symmetrically arranged closing plates 43, without external obstruction, are simultaneously pushed inward by the self-elasticity of the fourth springs 42 on both sides. This pushes the two sets of closing plates 43 towards the center of the needle outlet in the syringe body 1, ensuring a tight seal and complete blockage of the needle outlet. The airtight seal of the closing plates 43 isolates the internal residual needle from contact with external air and objects, preventing leakage of residual medication, intrusion of external bacteria and dust, and cross-contamination.
[0067] During the retraction and backward movement of the connecting block 32 and the needle 6, the outer wall of the connecting block 32 continuously presses against the second locking block 53 on the self-locking assembly 5. The second locking block 53 is deflected and oscillated by the lateral pressing force, while simultaneously compressing the fifth spring 52 on the rear side, creating clearance space to ensure the connecting block...
[0068] 32. Successfully passed. After the connecting block 32 completely passes the locking position of the second locking block 53, the lateral squeezing force disappears, the compressed fifth spring 52 elastically resets, pushing the second locking block 53 to quickly rebound and reset, re-protruding and locking. After resetting, the second locking block 53 blocks behind the connecting block 32, forming a rigid limit, firmly locking the stroke of the push rod 2, restricting the push rod 2 to move backward and forward in both directions, preventing the push rod 2 from accidentally sliding back and popping out, completely avoiding secondary exposure of the needle, and completing the fully automated protection locking.
[0069] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. A self-destructing safety syringe, comprising a syringe body (1), a plunger (2), a self-destruct mechanism (3), and a needle (6), characterized in that, The push rod (2) is slidably connected to the syringe body (1); The needle (6) is mounted on the bottom wall of the syringe body (1); The self-destruct mechanism (3) includes a fixed column (9), a first spring (31), a connecting block (32), a rebound assembly (33), a limiting assembly (34), a closing assembly (4), and a self-locking assembly (5). The fixing post (9) is installed inside the push rod (2); One end of the first spring (31) is fixed to the bottom wall of the fixed post (9); The connecting block (32) is connected to the other end of the first spring (31); The rebound assembly (33) is disposed at the other end of the first spring (31); The limiting component (34) is disposed inside the push rod (2); The closing assembly (4) is disposed inside the syringe body (1); The self-locking component (5) is disposed on the syringe body (1).
2. A safety syringe with a self-destructible needle according to claim 1, characterized in that, The rebound assembly (33) includes a first locking block (331), a push post (332), a second spring (333), and a connecting rod (334), wherein, The first card block (331) is slidably connected inside the connecting block (32); The pusher (332) is fixed to the outer wall of the first locking block (331); The second spring (333) is sleeved on the outside of the push post (332), and one end of the second spring (333) is fixed to the outer wall of the first locking block (331); The connecting rod (334) is connected to the other end of the pusher (332).
3. A self-inactivating safety syringe according to claim 2, wherein The limiting component (34) includes a third spring (341) and a limiting block (342), wherein, One end of the third spring (341) is fixed inside the push rod (2); The limiting block (342) is connected to the other end of the third spring (341).
4. A self-inactivating safety syringe according to claim 1, wherein The closing assembly (4) includes a closing block (41), a fourth spring (42), and a closing plate (43), wherein, The closing block (41) is installed inside the syringe body (1); Two fourth springs (42) are provided, and one end of each fourth spring (42) is fixed inside the syringe body (1); Two closing plates (43) are provided, and the two closing plates (43) are respectively connected to the other end of the corresponding fourth spring (42).
5. A self-inactivating safety syringe according to claim 1, wherein The self-locking assembly (5) is provided in two sets, each set of the self-locking assembly (5) includes a fixing block (51), a fifth spring (52), and a second locking block (53), wherein, The fixing block (51) is fixed to the syringe body (1); One end of the fifth spring (52) is fixed to the inner wall of the fixing block (51); The second locking block (53) is connected to the other end of the fifth spring (52).
6. A self-deactivating safety syringe according to claim 5, wherein: The bottom of the syringe body (1) is provided with a protective component (7), wherein the protective component (7) includes a protective block (71), a threaded block (72), a protective sleeve (73), and a knob (74). The protective block (71) is fitted over the outside of the needle (6); The threaded block (72) is installed inside the protective block (71); The protective sleeve (73) is fitted over the outside of the needle (6); The knob (74) is mounted on the outer wall of the protective sleeve (73).
7. A self-deactivating safety syringe according to claim 6, wherein, The push rod (2) is provided with an anti-slip component (8), wherein, The anti-slip component (8) includes an anti-slip block (81) and an anti-slip pad (82), wherein, The anti-slip block (81) is mounted on the push rod (2); The anti-slip pad (82) is fixed on the anti-slip block (81).