A rotating retractable stab-proof syringe

Abstract

The invention discloses a rotary retractable anti-stab-injury syringe, comprising a syringe, a push rod, and an injection needle. The end of the push rod in the syringe is provided with a piston and a connecting rod rotating nut, and a through hole and an unlocking rotating groove are respectively provided in the two. A retraction hole is provided in the push rod, and a retraction rod is connected. A rotating convex column is provided on the retraction rod; a spring is sleeved on the retraction rod, and a positioning lock nut is connected to the end of the retraction rod. A plurality of positioning lock nut are provided in the retraction hole to form a positioning lock table for positioning the positioning lock nut and overcoming the spring elastic force to make it in a compressed state, and an unlocking gap is formed between the plurality of positioning lock tables, and a positioning lock groove is provided on the positioning lock table. The invention improves the stability of the syringe rebound anti-stab-injury function before and after use, is convenient to operate, and is reliable to use, effectively prevents the syringe from causing stabs to the human body after use, and improves the safety of use.

Description

Technical Field

[0001] The invention relates to the technical field of syringes, and in particular to a rotary retractable stab-proof syringe. Background Art

[0002] A syringe is a common medical device. The needle on the syringe is an important component in the injection and medication process. Before being used for injection and medication, the needle of the syringe is generally provided with a protective cap for protection. When not in use, the needle body is in the sheath and will not cause stab injuries to medical staff. However, after the syringe is used, due to the heavy workload and work intensity of medical staff, the protective cap is often not put back on the needle, which can easily cause stab injuries to medical staff by the exposed sharp needle. Moreover, during the centralized placement and recycling process, the exposed needles will inevitably cause stab injuries to the staff. After use, most of the syringes and needles have residual liquid medicine and the bacteria used for injection. No matter what the situation is, the stab injury is likely to cause the risk of bacterial infection.

[0003] Therefore, retractable syringes have appeared on the market, which can retract the needle body of the injection needle into the syringe. Most of the retractable structures on the existing market use a spring and a slide rod structure to pull the needle body of the injection needle back into the syringe. In the existing structure, a convex rib is mainly used to position the end of the slide rod before injection, so that the spring on the slide rod remains compressed. The structure of the convex rib is rigid and has poor elasticity, and the following binary contradictory conditions must be met here: it must be able to withstand the reaction force of the spring, and the strength of the spring cannot be small, otherwise the needle cannot be effectively pulled back; if the strength of the spring is large, the rib must be convex enough, otherwise it cannot withstand the reaction force of the spring; and the size of the rib is affected by the forced demoulding of the mold, and the size of the rib is also affected by the assembly, and the size adjustment is subject to many restrictions; therefore, the existing structure causes the installation and positioning of the spring and the slide rod to be unstable, and the retraction phenomenon is often unable to be achieved, affecting the use. Summary of the invention

[0004] The purpose of the present invention is to solve the problems raised in the above background technology and to provide a rotary retractable stab-proof syringe.

[0005] To achieve the above-mentioned purpose, the technical scheme of the present invention is as follows: a rotary retractable stab-proof syringe comprises a syringe, a push rod and an injection needle, wherein a piston and a connecting rod rotating nut are arranged on the end of the push rod in the syringe, and a through hole and an unlocking rotating groove are respectively arranged in the two, a retraction hole is arranged in the push rod, a retraction rod is connected in the retraction hole, and a rotating convex column corresponding to the unlocking rotating groove is arranged on the retraction rod; a spring is sleeved on the retraction rod, one end of the retraction rod passes through the unlocking rotating groove and the through hole, and the other end is fixedly connected with a positioning lock nut, a plurality of positioning lock platforms are arranged in the retraction hole to form a positioning with the positioning lock nut, overcome the elastic force of the spring to make it in a compressed state, an unlocking gap is formed between the plurality of positioning lock platforms, a positioning lock groove is arranged on the positioning lock platform, and a positioning lock column corresponding to the positioning lock platform and capable of being positioned in the positioning lock groove is arranged on the positioning lock nut.

[0006] The injection needle comprises an outer needle seat, an inner needle seat, a positioning switch and a needle body, the needle body is connected to the inner needle seat, the inner needle seat is arranged in the outer needle seat and is positioned by the positioning switch, the inner needle seat is respectively provided with a positioning step and an unlocking step, and a plurality of elastic positioning claws are evenly arranged on the circumference of the end of the positioning switch; the end of the retraction rod is provided with a buckle hole, and a buckle boss is arranged in the buckle hole, the retraction rod can release the positioning of the inner needle seat by the positioning switch, and can form a buckle with the inner needle seat to move synchronously.

[0007] The number of the positioning locking cylinders corresponds to the number of the positioning locking platforms.

[0008] A retraction stop boss is arranged in the retraction hole, and a plurality of stop protrusions which can form a positioning abutment with the retraction stop boss are arranged on the positioning lock nut.

[0009] The maximum diameter of the inner needle seat is smaller than the diameters of the through hole, the unlocking rotation groove, and the retraction hole, and the diameter formed by the rotating protrusion on the retraction rod is smaller than the inner diameter of the spring.

[0010] A plurality of squeezed cavities are arranged in the piston.

[0011] The number of the rotating bosses corresponds to the number of the unlocking rotating grooves in the connecting rod rotating nut.

[0012] The end of the push rod is provided with a mounting groove, and the connecting rod rotating nut is fixedly mounted in the mounting groove of the end of the push rod by the piston pressing.

[0013] The positioning lock nut is provided with a retracting rod connecting hole, the retracting rod connecting hole is triangular in shape, and the part of the retracting rod in the retracting rod connecting hole is also triangular in shape.

[0014] A fixing boss for positioning and fixing the positioning switch is arranged inside the outer needle seat.

[0015] By adopting the above technical solution, the present invention has the following beneficial effects:

[0016] Compared with the prior art, after the injection is completed, the present invention continues to apply force to push the push rod, so that the retraction rod at the end of the push rod can be extended into the positioning switch, the positioning switch can be released for the positioning effect on the inner needle seat, and at the same time a snap connection is formed between the inner needle seat; when the end of the retraction rod is against the inner needle seat, the force applied by the push rod reacts on the retraction rod, so that the retraction rod rotates itself along the unlocking rotation groove through the rotating boss, and at the same time drives the positioning lock nut at its end to rotate, and the positioning lock nut can slide out of the positioning lock groove on the positioning lock platform by a slight rotation, and when the positioning lock column on the positioning lock nut is synchronously rotated to correspond to the unlocking gap and slides out under the elastic force of the spring, the positioning effect of the positioning lock nut disappears, the spring elastic force is released, and the retraction rod, the inner needle seat and the needle body rebound and move into the push rod.

[0017] The present invention redesigns the positioning and retraction movement of the retraction rod, which not only improves the stability of the spring and the retraction rod before use, but also allows the retraction rod to be rotated and unlocked by a slight force after the injection is completed, so that the spring elastic force is released to pull the needle body of the injection needle into the push rod. This is convenient to operate and reliable to use, effectively preventing the syringe from causing punctures to the human body after use, and improving the safety of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a cross-sectional view of the present invention (in the state where the retraction rod unlocks the positioning switch after injection);

[0019] Figure 2 yes Figure 1 A magnified view of part A;

[0020] Figure 3 yes Figure 1 A magnified view of part B;

[0021] Figure 4 is a three-dimensional exploded view of the present invention;

[0022] Figure 5 is a three-dimensional cross-sectional view of the push rod in the present invention;

[0023] Figure 6 It is a cross-sectional view of the present invention (after use, it enters the stab-proof state). DETAILED DESCRIPTION

[0024] The present invention will be further described in conjunction with the accompanying drawings.

[0025] like Figures 1 to 6As shown, the present invention provides a rotary retractable stab-proof syringe, comprising a syringe 1, a push rod 2, and an injection needle, wherein a piston 3 and a connecting rod rotating nut 4 are arranged on the end of the push rod 2 in the syringe 1, and a through hole 5 and an unlocking rotating groove 6 are respectively arranged in both, wherein a mounting groove 7 is arranged at the end of the push rod 2, the piston 3 is fixedly connected to the push rod 2, and the connecting rod rotating nut 4 is pressed and fixedly installed in the mounting groove 7 of the push rod 2.

[0026] A retraction hole 8 is provided in the push rod, and a retraction rod 9 is connected in the retraction hole 8. One end of the retraction rod 9 passes through the unlocking rotation groove 6 and the through hole 5, and the other end is fixedly connected to a positioning lock nut 10, wherein a spring 11 is sleeved on the retraction rod 9, one end of the spring 11 abuts against the connecting rod rotating nut 4, and the other end abuts against the positioning lock nut 10 on the retraction rod 9, and a plurality of positioning lock platforms 12 are provided in the retraction hole 8 to form a positioning lock nut 10, and the force of the positioning lock platform 12 against the positioning lock nut 10 is greater than the elastic force of the spring 11, so that the retraction rod 9 is positioned in the retraction hole 8 and the spring 11 is in a compressed state; the injection needle package It comprises an outer needle seat 13, an inner needle seat 14, a positioning switch 15 and a needle body 16, the needle body 16 is connected to the inner needle seat 14, the inner needle seat 14 is arranged in the outer needle seat 13, a fixing boss 17 is arranged in the outer needle seat 13 to form a positioning clamp for the positioning switch 15, so as to form a positioning for the positioning switch 15, the inner needle seat 14 is respectively provided with a positioning step 18 and an unlocking step 19, a plurality of elastic positioning claws 20 are evenly arranged on the circumference of the end of the positioning switch 15, and the inner needle seat is positioned and installed by the elastic positioning claws 20 against the positioning step 18; a buckle hole 21 is arranged at the end of the retraction rod 9, and a buckle boss 22 is arranged in the buckle hole 21.

[0027] The retraction rod 9 is provided with a rotating boss 23 corresponding to the unlocking rotating groove 6, and the number of the rotating boss 23 corresponds to the number of the unlocking rotating grooves 6 in the connecting rod rotating nut 4. An unlocking gap 24 is formed between a plurality of positioning locking platforms 12. The positioning locking platforms 12 are provided with positioning locking grooves 25. The positioning lock nut 10 is provided with positioning locking columns 26 corresponding to the positioning locking platforms 12 respectively and capable of being positioned in the positioning locking grooves 25. The number of the positioning locking columns 26 corresponds to the number of the positioning locking platforms 12.

[0028] After the injection is finished, the push rod 2 continues to be forced, and the piston 3 at its end is compressed by the pressure. The piston 3 is compressed, so that the push rod 2 drives the retraction rod 9 at the end to continue to move, and the end of the retraction rod 9 opens the elastic positioning claw 20 on the positioning switch 15, thereby releasing the positioning of the inner needle seat 14 by the positioning switch 15, and can form a buckle with the inner needle seat 14 through the buckle boss 22 in the end buckle hole 21 to move synchronously; after the positioning of the inner needle seat 14 is released, the rear force is applied to the retraction rod 9, so that the rotating boss 23 on the retraction rod 9 enters the unlocking rotation groove 6 of the connecting rod rotating nut 4 and rotates and moves, and the positioning lock nut 10 is provided with a retraction rod connecting hole 27, and the retraction rod connecting hole 27 is triangular in shape, and the retraction rod 9 is connected to the retraction rod connecting hole 27. The portion inside the hole 27 is also triangular in shape, so that a relatively fixed connection is formed between the retraction rod 9 and the positioning lock nut 10, and then the positioning lock nut 10 and the retraction rod 9 rotate synchronously; when the retraction rod 9 rotates, the positioning lock nut 10 rotates at the same time. After the positioning lock nut 10 rotates and moves to correspond to the unlocking gap 24, the positioning lock base 12 in the retraction hole 8 loses its positioning effect on the positioning lock nut 10. At this time, the elastic force of the spring 11 will be released, and the positioning lock nut 10 and the retraction rod 9 are moved under the elastic force of the spring 11, thereby bringing the inner needle seat 14 that is now buckled with the retraction rod 9 and the needle body 16 fixed to the inner needle seat 14 into the retraction hole 8 of the push rod 2, thereby effectively preventing the needle body from causing punctures to personnel after injection.

[0029] Furthermore, the maximum diameter of the inner needle seat 14 is smaller than the diameters of the through hole 5, the unlocking rotation groove 6, and the retraction hole 8, thereby not affecting the synchronous movement of the inner needle seat 14 and the retraction rod 9 into the retraction hole 8, and the diameter formed by the rotating boss 23 on the retraction rod 9 is smaller than the inner diameter of the spring 11, thereby not affecting the movement of the retraction rod through the inside of the spring; a retraction stop boss 28 is provided in the retraction hole 8, and a plurality of stop protrusions 29 are provided on the positioning lock nut 10, which can form a positioning abutment with the retraction stop boss 28, so that there is a limit on the positioning lock nut 10 when the elastic force of the spring 11 is used to retract, thereby preventing the various components from popping out of the retraction hole 8 of the push rod 2 under the action of the elastic force of the spring 11; of course, other limiting means can also be used on the push rod.

[0030] Furthermore, a plurality of squeezed cavities 30 are provided in the piston 3, so that it is easier to squeeze and thin the piston, and the retraction rod at the end of the push rod can more easily release the positioning effect of the positioning switch on the inner needle seat.

[0031] A rotary retractable stab-proof syringe provided by an embodiment of the present invention is introduced in detail above. Specific examples are used herein to illustrate the principle and implementation mode of the present invention. The description of the above embodiments is only used to help understand the technical solutions disclosed by the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation mode and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A rotary retractable anti-stab syringe, comprising a syringe, a push rod, and an injection needle, characterized in that: The end of the push rod in the syringe is provided with a piston and a connecting rod rotating nut, and a through hole and an unlocking rotating groove are respectively provided in the two, a retraction hole is provided in the push rod, and a retraction rod is connected in the retraction hole, and a rotating convex column corresponding to the unlocking rotating groove is provided on the retraction rod; a spring is sleeved on the retraction rod, one end of the retraction rod passes through the unlocking rotating groove and the through hole, and the other end is fixedly connected with a positioning lock nut, and a plurality of positioning lock tables are provided in the retraction hole to form a positioning lock nut to overcome the elastic force of the spring and put it in a compressed state, an unlocking gap is formed between the plurality of positioning lock tables, and a positioning lock groove is provided on the positioning lock table, and a positioning lock column corresponding to the positioning lock table and capable of being positioned in the positioning lock groove is provided on the positioning lock nut; The injection needle comprises an outer needle seat, an inner needle seat, a positioning switch and a needle body, the needle body is connected to the inner needle seat, the inner needle seat is arranged in the outer needle seat and is positioned by the positioning switch, the inner needle seat is respectively provided with a positioning step and an unlocking step, and a plurality of elastic positioning claws are evenly arranged on the circumference of the end of the positioning switch; the end of the retraction rod is provided with a buckle hole, and a buckle boss is arranged in the buckle hole, the retraction rod can release the positioning of the inner needle seat by the positioning switch, and can form a buckle with the inner needle seat to move synchronously.

2. A rotary retractable stab-proof syringe according to claim 1, characterized in that: The number of positioning locking cylinders corresponds to the number of positioning locking platforms.

3. The rotary retractable stab-proof syringe according to claim 1, characterized in that: A retraction stop boss is arranged in the retraction hole, and a plurality of stop protrusions which can form a positioning abutment with the retraction stop boss are arranged on the positioning lock nut.

4. The rotary retractable stab-proof syringe according to claim 1, characterized in that: The maximum diameter of the inner needle seat is smaller than the diameters of the through hole, the unlocking rotation groove, and the retraction hole, and the diameter formed by the rotating protrusion on the retraction rod is smaller than the inner diameter of the spring.

5. The rotary retractable stab-proof syringe according to claim 1, characterized in that: A plurality of squeezed cavities are arranged in the piston.

6. The rotary retractable stab-proof syringe according to claim 1, characterized in that: The number of the rotating bosses corresponds to the number of the unlocking rotating grooves in the connecting rod rotating nut.

7. The rotary retractable stab-proof syringe according to claim 1, characterized in that: The end of the push rod is provided with a mounting groove, and the connecting rod rotating nut is fixedly mounted in the mounting groove of the end of the push rod by the piston pressing.

8. The rotary retractable stab-proof syringe according to claim 1, characterized in that: The positioning lock nut is provided with a retracting rod connecting hole, the retracting rod connecting hole is triangular in shape, and the part of the retracting rod in the retracting rod connecting hole is also triangular in shape.

9. The rotary retractable stab-proof syringe according to claim 1, characterized in that: A fixing boss for positioning and fixing the positioning switch is arranged inside the outer needle seat.

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