Retractable syringe
By designing the piston assembly and screw pin structure of the retractable syringe, the needle is automatically stored, which solves the problem of needle stabbing after use of the syringe, improves safety and convenience, and supports emergency reuse.
Patent Information
- Application Number
- CN202421162461.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-25
- Publication Date
- 2025-07-01
- Estimated Expiration
- 2034-05-25
AI Technical Summary
It is difficult to avoid needle stabbing after use, which leads to the risk of disease transmission during secondary use, and requires manual breakage or separation of the structure for destruction, which is inconvenient to operate.
A retractable syringe is designed to rotate and retract the needle into the piston rod through the piston assembly and screw pin structure, and the rotary disc is used to control the rotation and retraction of the needle to achieve automatic storage.
Effectively avoid needle stabs, simplifies the syringe destruction process, improves safety and operational convenience, and allows reuse in emergencies.
Smart Images
Figure CN223041928U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the field of syringes, and in particular relates to a retractable syringe. Background Art
[0002] A syringe is a common medical device that mainly uses a needle to extract or inject gas or liquid. However, after using this type of syringe, the structure of the entire syringe barrel will remain intact, causing the discarded injection needle to easily stab medical and cleaning personnel, causing improper infection and injury. Therefore, in order to avoid the secondary use of the syringe causing disease transmission, the syringe needs to be destroyed after use. Usually, medical staff manually break the syringe's push rod or separate the push rod from the syringe barrel, and the syringe barrel needs to be destroyed. Utility Model Content
[0003] The utility model aims at solving the deficiencies of the prior art and provides a retractable syringe.
[0004] In order to achieve the above-mentioned purpose, the utility model provides the following technical solution: a retractable syringe, comprising a needle tube, characterized in that: a piston assembly slides inside the needle tube, and a needle is threadedly connected to the bottom of the needle tube;
[0005] The piston assembly includes a piston core and a piston rod, wherein the piston rod is fixed on one end surface of the piston core, and an outer cover is fixed on the other end surface of the piston rod. A screw pin is movably connected inside the piston rod, and a slide groove is slidable inside the screw pin. The slide groove passes through the piston rod and the outer cover to the outside, and a turntable is fixed to the outside part of the slide groove.
[0006] Optionally, the inner wall of the piston rod is provided with an internal thread, the screw pin is threadedly connected in the piston rod, a rotating rod is provided in the screw pin, and the sliding groove slides in the rotating rod.
[0007] Optionally, the slide groove is divided into a square section and a cylindrical section, wherein the square section slides in the screw pin, the cylindrical section is rotationally connected to the outer cover, and a raised portion is provided on the outer peripheral side of the turntable.
[0008] Optionally, at least two clamping strips are fixed to the bottom of the screw pin, the needle is threadedly connected to the bottom of the needle tube, and at least two notches are formed on one end surface of the needle close to the piston core, and the notches correspond to the clamping strips.
[0009] Optionally, the side of the piston core is arranged as an inclined surface, and at least two grooves are provided on the inclined surface. The inner bottom end surface of the needle tube is also arranged as an inclined surface, and at least two ridges are provided on the inclined surface, and the grooves match the ridges.
[0010] In summary, the utility model has the following beneficial effects compared with the prior art:
[0011] 1. Due to the setting of the piston assembly, the needle can be driven to rotate by rotating the screw pin, so that the needle retracts into the piston rod, effectively avoiding stabbing people with the needle. Thus, it can be directly thrown into the medical waste bin. If you want to continue using it in an emergency, just press the outer cover and rotate the turntable in the reverse direction to screw the needle out of the piston rod and reinstall it on the syringe barrel. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 is a perspective view of the utility model.
[0013] Figure 2 is a half-sectional view of the utility model.
[0014] Figure 3 is the utility model Figure 2 an enlarged view of part A in.
[0015] Figure 4 is a half-sectional view of the utility model.
[0016] 10. Syringe barrel; 11. Needle; 12. Piston core; 13. Piston rod; 14. Screw pin; 15. Slide groove; 16. Rotating rod; 17. Clamping strip; 18. Groove; 19. Turntable; 20. Outer cover; 21. Convex rib. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0017] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the utility model.
[0018] As shown in FIGS. 1-4, a retractable syringe includes a syringe barrel 10, characterized in that: a piston assembly slides in the syringe barrel 10, the bottom of the syringe barrel 10 is threadedly connected with a needle 11, the piston assembly includes a piston core 12 and a piston rod 13, the piston rod 13 is fixed on one side end face of the piston core 12, the side of the piston core 12 is provided with an inclined surface, at least two grooves 18 are opened on the inclined surface, the inner bottom end face of the syringe barrel 10 is also provided with an inclined surface, and at least two convex ribs 21 are provided on the inclined surface, the grooves 18 are matched with the convex ribs 21, the other side end face of the piston rod 13 is fixed with an outer cover 20, a screw pin 14 is movably connected in the piston rod 13, a slide groove 15 slides in the screw pin 14, the slide groove 15 penetrates through the piston rod 13 and the outer cover 20 to the outside, the part of the slide groove 15 located outside is fixed with a turntable 19, the slide groove 15 is divided into a square section and a cylindrical section, wherein the square section slides in the screw pin 14, and the cylindrical section is rotatably connected with the outer cover 20, and a convex part is provided on the outer peripheral side of the turntable 19.
[0019] The inner wall of the piston rod 13 is provided with internal threads, and the screw pin 14 is threadedly connected inside the piston rod 13. A rotating rod 16 is provided inside the screw pin 14, and the sliding groove 15 slides inside the rotating rod 16. At least two clamping strips 17 are fixed to the bottom of the screw pin 14. The needle head 11 is threadedly connected to the bottom of the syringe barrel 10. At least two notches are provided on one end face of the needle head 11 close to the piston core 12, and the notches correspond to the clamping strips 17.
[0020] During use, the outer cover 20 can be directly pulled to drive the piston core 12 to move through the piston rod 13, so as to suck the liquid medicine. When the syringe is used up, the needle head 11 needs to be retracted, that is, the turntable 19 needs to be pressed forcefully so that the piston core 12 tightly adheres to the bottom of the syringe barrel 10, and then the turntable 19 is rotated. At this time, since the groove 18 at the bottom of the piston core 12 rotates to correspond to the convex rib 21, it can be stuck to the piston core 12 to prevent the piston core 12 from rotating. Continuing to rotate the turntable 19 can drive the screw pin 14 to rotate through the rotating rod 16 until the clamping strip 17 at the bottom of the screw pin 14 is stuck on the notch on the needle head 11. Then, when the screw pin 14 rotates, it can drive the needle head 11 to rotate. When the screw pin 14 rotates, it will move in the direction close to the turntable 19, and when the needle head 11 rotates, it will first rotate out of the syringe barrel 10 and then enter the piston rod 13, and follow the screw pin 14 into the inside of the piston rod 13 until the needle head 11 is completely retracted into the piston rod 13, effectively preventing the needle head 11 from stabbing people, so that it can be directly thrown into the medical trash can. If you want to use it again, just press the outer cover 20 and rotate the turntable 19 in the reverse direction to screw out the needle head 11 from the piston rod 13 and install it on the syringe barrel 10 again.
[0021] Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
Claims
1. A retractable syringe, comprising a needle tube (10), characterized in that: A piston assembly slides inside the needle tube (10), and a needle (11) is threadedly connected to the bottom of the needle tube (10); The piston assembly comprises a piston core (12) and a piston rod (13), wherein the piston rod (13) is fixed on one end face of the piston core (12), and an outer cover (20) is fixed on the other end face of the piston rod (13). A screw pin (14) is movably connected inside the piston rod (13), and a slide groove (15) is slidably provided inside the screw pin (14). The slide groove (15) passes through the piston rod (13) and the outer cover (20) to the outside, and a rotating disk (19) is fixed to the part of the slide groove (15) located outside.
2. A retractable syringe according to claim 1, characterized in that: The inner wall of the piston rod (13) is provided with an internal thread, the screw pin (14) is threadedly connected in the piston rod (13), a rotating rod (16) is provided in the screw pin (14), and the slide groove (15) slides in the rotating rod (16).
3. A retractable syringe according to claim 1, characterized in that: The slide groove (15) is divided into a square section and a columnar section, wherein the square section slides in the screw pin (14), the columnar section is rotationally connected to the outer cover (20), and a convex portion is provided on the outer peripheral side of the rotating disk (19).
4. A retractable syringe according to claim 1, characterized in that: At least two clamping strips (17) are fixed to the bottom of the screw pin (14), the needle (11) is threadedly connected to the bottom of the needle tube (10), and at least two notches are formed on the end surface of one side of the needle (11) close to the piston core (12), and the notches correspond to the clamping strips (17).
5. A retractable syringe according to claim 1, characterized in that: The side edge of the piston core (12) is arranged as an inclined surface, and at least two grooves (18) are provided on the inclined surface. The inner bottom end surface of the needle tube (10) is also arranged as an inclined surface, and at least two ridges (21) are provided on the inclined surface. The grooves (18) match the ridges (21).