Pull-back type self-destruction syringe

Abstract

The utility model relates to the technical field of injectors, in particular to a pull-back type self-destruction injector which comprises an injection cylinder, a piston rod is movably inserted into the injection cylinder, a connecting piece is fixedly connected to the bottom of the piston rod, a round rod is fixedly connected to the bottom of the connecting piece, and the round rod is fixedly connected with a piston rod. A plurality of inserting parts are fixedly connected to the bottom of the round rod circumferentially at equal intervals, and clamping parts are fixedly connected to the bottoms of the inserting parts; the bottom of the syringe is sleeved with a needle seat in a threaded mode, a needle sleeve is inserted into the needle seat, an inserting groove and a clamping groove are formed in the top of the needle sleeve, and the clamping groove is located at the bottom of the inserting groove. According to the disposable syringe, the piston rod is pulled back, due to the limitation of the clamping part, the needle sleeve and the needle tube in the needle sleeve are pulled back into the syringe together, self-destruction and retraction of the needle head are achieved, the pricking injury risk caused by the fact that the needle tube is exposed when medical staff and waste disposal staff dispose waste syringes is avoided, and safety is remarkably improved.

Description

Technical Field

[0001] The utility model relates to the technical field of syringes, in particular to a pull-back self-destructing syringe. Background Art

[0002] As an important tool in medical procedures, syringes are originally designed to safely and effectively deliver medicines or liquids into the patient's body.

[0003] After use, the sharp needles of syringes still retain their original sharpness. If mishandled, they can easily puncture the skin. Medical workers involved in the sorting, collection, transportation, or disposal of medical waste can easily be stabbed if they accidentally come into contact with these exposed needles. Similarly, waste disposal workers face the same risk when handling medical waste. To address this, a pull-out, self-destructing syringe was designed. Utility Model Content

[0004] In response to the shortcomings of the existing technology, the utility model provides a retractable self-destructive syringe that can achieve self-destruction and retraction of the needle, avoiding the risk of needlestick injuries caused by exposed needle tubes when medical staff and waste disposal personnel handle discarded syringes, thereby significantly improving safety.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solutions: a pull-back self-destruct syringe, comprising a syringe, a piston rod movably inserted into the syringe, a connector fixedly connected to the bottom of the piston rod, a round rod fixedly connected to the bottom of the connector, a plurality of plug-in portions fixedly connected to the bottom of the round rod at equal intervals around the circumference, and a clamping portion fixedly connected to the bottom of each plug-in portion;

[0006] The bottom threaded sleeve of the injection barrel is provided with a needle seat, the interior of the needle seat is plugged with a needle sleeve, the top of the needle sleeve is respectively provided with an inserting groove and a clamping groove, the clamping groove is located at the bottom of the inserting groove, and the inserting part and the clamping part are respectively adapted to the inserting groove and the clamping groove.

[0007] Furthermore, the longitudinal section of the clamping portion is an isosceles trapezoid, the outer diameter of the clamping portion gradually decreases in a direction away from the round rod, and the maximum outer diameter of the clamping portion is greater than the inner diameter of the plug-in slot.

[0008] Furthermore, the plurality of plug-in parts form a cylinder, the outer diameter of the cylinder is smaller than the inner diameter of the plug-in slot, and the height of the plug-in part is equal to the height of the plug-in slot.

[0009] Furthermore, the plurality of clamping portions form a truncated cone block, the clamping groove is a truncated cone groove, and the truncated cone block is adapted to the truncated cone groove.

[0010] Furthermore, a needle tube is embedded in the middle of the needle sleeve, and the top of the needle tube is communicated with the insertion groove and the clamping groove.

[0011] Furthermore, the outer surface of the connecting piece is covered with a rubber plug, a through hole is provided in the middle of the rubber plug, the outer diameter of the round rod is equal to the inner diameter of the through hole, the inner diameter of the through hole is larger than the maximum outer diameter of the needle sleeve, the top surface of the needle sleeve and the bottom surface of the rubber plug are both conical structures, and the taper of the top surface of the needle sleeve is the same as the taper of the bottom surface of the rubber plug.

[0012] Furthermore, a sealing ring is provided at the connection between the injection barrel and the needle seat, and the sealing ring is sleeved on the outer surface of the needle sleeve.

[0013] Furthermore, the bottom of the outer surface of the piston rod is provided with broken parts at equal intervals around the circumference.

[0014] Furthermore, a pressure plate is fixedly connected to the top of the piston rod, and the outer diameter of the pressure plate is larger than the outer diameter of the piston rod.

[0015] Furthermore, the outer surface of the needle seat is covered with a protective sleeve, and the needle tube is located inside the protective sleeve.

[0016] By means of the above technical solution, the present invention provides a retractable self-destructing syringe, which has at least the following beneficial effects:

[0017] 1. When injecting, the piston rod of the pull-back self-destruct syringe is slowly pushed downward to insert the bottom of the clamping part into the insertion groove of the needle sleeve. The multiple clamping parts are squeezed by the inner wall of the insertion groove, which can make the multiple insertion parts move closer to each other. When the clamping parts are completely inserted into the interior of the clamping groove, the multiple insertion parts return to their original state and are clamped in the interior of the clamping groove. After the injection is completed, the piston rod is pulled back. Due to the restriction of the clamping part, the needle sleeve and the needle tube inside it will be pulled back into the syringe together, realizing the self-destruction and retraction of the needle, avoiding the risk of needle stick injuries caused by the exposed needle tube when medical staff and waste disposal personnel handle discarded syringes, and significantly improving safety.

[0018] 2. After the injection is completed, the pull-back self-destructing syringe pulls the piston rod upwards, and the piston rod can be broken through the breaking part, thereby preventing the piston rod from being pushed in or pulled out again, realizing the self-destruction function of the syringe, which can effectively prevent the reuse of the syringe and reduce the risk of cross infection. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application:

[0020] Figure 1 This is a schematic diagram of the structure of the utility model;

[0021] Figure 2This is a structural diagram of the utility model when it is in the injection zero position state;

[0022] Figure 3 This is a schematic diagram of the structure of the device of the utility model when it is in a self-destruct state;

[0023] Figure 4 This is a schematic diagram of the structure of the round rod, the plug-in portion and the clamping portion of the utility model;

[0024] Figure 5 For this utility model Figure 1 A partial enlarged view of point A.

[0025] In the figure: 1. syringe barrel; 2. piston rod; 3. connector; 4. round rod; 5. plug-in portion; 6. clamping portion; 7. needle seat; 8. needle sleeve; 9. plug-in slot; 10. clamping slot; 11. needle tube; 12. rubber stopper; 13. breaking portion; 14. pressure plate; 15. protective sleeve. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] See also Figures 1-5 A pull-back self-destructing syringe comprises a syringe 1, a piston rod 2 being movably inserted into the syringe 1, a connector 3 being fixedly connected to the bottom of the piston rod 2, a round rod 4 being fixedly connected to the bottom of the connector 3, a plurality of plug-in portions 5 being fixedly connected to the bottom of the round rod 4 at equal intervals around the circumference, and a clamping portion 6 being fixedly connected to the bottom of the plug-in portion 5;

[0028] The bottom of the syringe 1 is threaded with a needle seat 7, the inside of the needle seat 7 is inserted with a needle sleeve 8, the top of the needle sleeve 8 is respectively provided with an insertion slot 9 and a clamping slot 10, the clamping slot 10 is located at the bottom of the insertion slot 9, and the insertion part 5 and the clamping part 6 are respectively matched with the insertion slot 9 and the clamping slot 10. During injection, the piston rod 2 is slowly pushed down, the bottom of the clamping part 6 is inserted into the insertion slot 9 of the needle sleeve 8, the plurality of clamping parts 6 are extruded by the inner wall of the insertion slot 9, so that the plurality of insertion parts 5 are close to each other, when the clamping part 6 is inserted into the inside of the clamping slot 10, the plurality of insertion parts 5 return to the original state, and the clamping part 6 is clamped in the inside of the clamping slot 10; after the injection is completed, the piston rod 2 is pulled back, and due to the limitation of the clamping part 6, the needle sleeve 8 and the needle tube 11 inside the needle sleeve 8 are pulled back into the inside of the syringe 1 together, the needle is self-destroyed and retracted, the risk of needle stick injury caused by the exposure of the needle tube when the medical staff and waste disposal personnel handle the waste syringe is avoided, and the safety is significantly improved.

[0029] The longitudinal section of the clamping part 6 is isosceles trapezoidal, and the outer diameter of the clamping part 6 gradually decreases away from the circular rod 4. Such a design makes the clamping part 6 more easily enter and be clamped in the clamping slot 10. Since the maximum outer diameter of the clamping part 6 is greater than the inner diameter of the insertion slot 9, it ensures that the clamping part 6 can be deformed by sufficient pressure when reaching the clamping slot 10, so as to be more firmly clamped in the clamping slot 10.

[0030] The plurality of insertion parts 5 form a cylinder, the outer diameter of the cylinder is smaller than the inner diameter of the insertion slot 9, and the height of the insertion part 5 is equal to the height of the insertion slot 9, so that the insertion part 5 can slide in the insertion slot 9 and will not affect the injection process due to being too tight or too loose.

[0031] The plurality of clamping parts 6 form a circular truncated block, and the clamping slot 10 is a circular truncated groove, the circular truncated block and the circular truncated groove are matched, so that the clamping part 6 can be automatically aligned and smoothly enter the clamping slot 10 during the clamping process, without the need for additional operation or adjustment, improving the convenience of use.

[0032] The middle part of the needle sleeve 8 is embedded with a needle tube 11, the top of the needle tube 11 communicates with the insertion slot 9 and the clamping slot 10, the needle tube 11 serves as a channel for the flow of liquid medicine, and the top of the needle tube 11 communicates with the insertion slot 9 and the clamping slot 10, which ensures that the liquid medicine can smoothly flow from the syringe 1 into the needle tube 11 during the injection process, and then enter the patient's body through the needle, which avoids the blockage or leakage of the liquid medicine during the flow process, and improves the accuracy and safety of the injection.

[0033] The outer surface of the connector 3 is covered with a rubber plug 12, and a through hole is provided in the middle of the rubber plug 12. The rubber plug 12 serves as a sealing element between the connector 3 and the syringe 1, and can fit tightly against the inner wall of the syringe 1 to prevent the drug from leaking. The outer diameter of the round rod 4 is equal to the inner diameter of the through hole. The round rod 4 can block the through hole of the rubber plug 12, thereby preventing the drug from leaking and making the injection of the drug more complete. The top surface of the needle sleeve 8 and the bottom surface of the rubber plug 12 are both conical structures. The taper of the top surface of the needle sleeve 8 is the same as the taper of the bottom surface of the rubber plug 12. During injection, since the taper of the bottom surface of the rubber plug 12 is consistent with that of the top surface of the needle sleeve 8, the two fit tightly together, which is conducive to the drug being able to flow into the needle tube 11 better.

[0034] A sealing ring is provided at the connection between the syringe 1 and the needle holder 7, and the sealing ring is sleeved on the outer surface of the needle sleeve 8. The sealing ring can fit tightly against the connection surface between the syringe 1 and the needle holder 7, preventing the drug solution from leaking from the connection during the injection process, thereby ensuring the accuracy and safety of the injection.

[0035] The bottom of the outer surface of the piston rod 2 is provided with breakout portions 13 at equal intervals around the circumference. After the injection is completed, the piston rod 2 is pulled upward, and the breakout portions 13 break the piston rod 2, thereby preventing the piston rod 2 from being pushed in or pulled out again. This realizes the self-destruction function of the syringe, effectively preventing the reuse of the syringe and reducing the risk of cross infection.

[0036] A pressing plate 14 is fixedly connected to the top of the piston rod 2 . The outer diameter of the pressing plate 14 is larger than the outer diameter of the piston rod 2 . The arrangement of the pressing plate 14 allows medical staff to operate the piston rod 2 more conveniently.

[0037] The outer surface of the needle seat 7 is covered with a protective sleeve 15, and the needle tube 11 is located inside the protective sleeve 15. The protective sleeve 15 provides a protective space for the needle tube 11, which can effectively prevent the needle tube 11 from being contaminated by dust, bacteria and other pollutants during transportation, storage and use.

[0038] Working principle: During injection, the piston rod 2 is slowly pushed downwards, and the bottom of the clamping portion 6 is inserted into the insertion groove 9 of the needle sleeve 8. The multiple clamping portions 6 are squeezed by the inner wall of the insertion groove 9, which can make the multiple insertion portions 5 move closer to each other. When the clamping portion 6 is completely inserted into the interior of the clamping groove 10, the multiple insertion portions 5 return to their original state, and the clamping portion 6 is clamped in the interior of the clamping groove 10 (such as Figure 2 shown);

[0039] After the injection is completed, the piston rod 2 is pulled back. Due to the restriction of the clamping part 6, the needle cover 8 and the needle tube 11 inside will be pulled back into the syringe 1 together, realizing the self-destruction and retraction of the needle, avoiding the risk of needle stick injuries caused by the exposed needle tube when medical staff and waste disposal personnel handle discarded syringes;

[0040] After the injection is completed, the piston rod 2 is pulled upwards and the piston rod 2 is broken by the breaking portion 13 (eg Figure 3 As shown), the piston rod 2 is prevented from being pushed in or pulled out again, thereby realizing the self-destruction function of the syringe, effectively preventing the reuse of the syringe and reducing the risk of cross infection.

[0041] It should be noted that the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements that are inherent to such process, method, article or apparatus.

[0042] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pull-back self-destructing syringe, comprising a syringe (1), characterized in that: The injection cylinder (1) has a piston rod (2) movably inserted therein, the bottom of the piston rod (2) is fixedly connected to a connecting piece (3), the bottom of the connecting piece (3) is fixedly connected to a round rod (4), the bottom of the round rod (4) is fixedly connected to a plurality of plug-in parts (5) at equal intervals around the circumference, and the bottom of the plug-in part (5) is fixedly connected to a clamping part (6); The bottom thread sleeve of the injection barrel (1) is provided with a needle seat (7), the interior of the needle seat (7) is plugged with a needle sleeve (8), the top of the needle sleeve (8) is respectively provided with an inserting groove (9) and a clamping groove (10), the clamping groove (10) is located at the bottom of the inserting groove (9), and the inserting portion (5) and the clamping portion (6) are respectively adapted to the inserting groove (9) and the clamping groove (10).

2. The pull-back self-destructing syringe according to claim 1, characterized in that: The longitudinal section of the clamping portion (6) is an isosceles trapezoid, the outer diameter of the clamping portion (6) gradually decreases in a direction away from the round rod (4), and the maximum outer diameter of the clamping portion (6) is greater than the inner diameter of the insertion groove (9).

3. The pull-back self-destructing syringe according to claim 1, characterized in that: The plurality of plug-in parts (5) form a cylinder, the outer diameter of the cylinder is smaller than the inner diameter of the plug-in slot (9), and the height of the plug-in part (5) is equal to the height of the plug-in slot (9).

4. The pull-back self-destructing syringe according to claim 1, characterized in that: The plurality of clamping parts (6) form a truncated cone block, the clamping groove (10) is a truncated cone groove, and the truncated cone block is adapted to the truncated cone groove.

5. The pull-back self-destructing syringe according to claim 1, characterized in that: A needle tube (11) is embedded in the middle of the needle sleeve (8), and the top of the needle tube (11) is communicated with the insertion groove (9) and the clamping groove (10).

6. The pull-back self-destructing syringe according to claim 1, characterized in that: The outer surface of the connecting member (3) is provided with a rubber plug (12), the middle portion of the rubber plug (12) is provided with a through hole, the outer diameter of the round rod (4) is equal to the inner diameter of the through hole, the top surface of the needle sleeve (8) and the bottom surface of the rubber plug (12) are both conical structures, and the taper of the top surface of the needle sleeve (8) is the same as the taper of the bottom surface of the rubber plug (12).

7. The pull-back self-destructing syringe according to claim 1, characterized in that: A sealing ring is provided at the connection between the injection cylinder (1) and the needle seat (7), and the sealing ring is sleeved on the outer surface of the needle sleeve (8).

8. The pull-back self-destructing syringe according to claim 1, characterized in that: The bottom of the outer surface of the piston rod (2) is provided with breaking portions (13) at equal intervals around the circumference.

9. The pull-back self-destructing syringe according to claim 1, characterized in that: A pressure plate (14) is fixedly connected to the top of the piston rod (2), and the outer diameter of the pressure plate (14) is larger than the outer diameter of the piston rod (2).

10. The pull-back self-destructing syringe according to claim 5, characterized in that: The outer surface of the needle seat (7) is covered with a protective sleeve (15), and the needle tube (11) is located inside the protective sleeve (15).

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