CN215585092U - Direct-push self-destruction safety syringe - Google Patents

Abstract

The utility model discloses a direct-push self-destruction safety syringe, belonging to the technical field of syringes. Comprises a needle cylinder, a needle head seat, a core rod, a piston and a tenon; the tenon is outer and be located and be equipped with the extrusion ring between piston and the syringe needle seat, the lower part of syringe needle seat from top to bottom divide into fixed part and toper portion, the outside of fixed part is coaxial to be equipped with outer annular protrusion, the external diameter of toper portion reduces gradually from top to bottom, upper portion is equipped with in the cylinder with outer annular protrusion complex annular, in outer annular protrusion embedding annular, the coaxial stopping bulge loop that is equipped with in the cylinder, the top of piston is leaned on in the downside of stopping bulge loop. The bottom of the extrusion ring energy is propped against the upper side of the retaining convex ring, and the upper part of the extrusion ring energy is propped against the outer side of the conical part; the lower part of the needle head seat is composed of a plurality of petals which are uniformly distributed in a ring shape; after injection is completed, the core rod is pushed upwards, the extrusion ring moves upwards, the inner side of the upper portion of the extrusion ring abuts against the outer side of the conical portion, the flaps are bent inwards, and the outer annular protrusion is completely separated from the annular groove due to inward bending of the flaps.

Description

Direct-push self-destruction safety syringe

Technical Field

The utility model belongs to the technical field of syringes, and particularly relates to a direct-push self-destruction safety syringe.

Background

Currently, syringes are the most commonly used, and are one of the largest volume medical devices used. In recent years, disposable sterile syringes have become popular for the control of iatrogenic infectious diseases and to avoid cross-contamination and other adverse effects. However, the existing disposable syringes have the defects of intact use, reusability, no safety device, exposed needle after injection and the like. On one hand, the disposable syringe is easy to be utilized by the heart molecules, and the disposable syringe which is discarded after being used is reused, so that the transmission and cross infection of viruses are easily caused; on the other hand, the needle after injection is still remained outside, which not only brings inconvenience to the carrying and destroying of the garbage in the injector relative to the sharpness degree of the needle, but also often happens that the needle tip is exposed to injure the user carelessly. Many countries have passed legislation that emphasizes the necessity of using safe self-destructive syringes.

SUMMERY OF THE UTILITY MODEL

In order to solve the above problems, embodiments of the present invention provide a direct-push self-destruction safety syringe, after injection is completed, the syringe is pushed upward continuously, the connection between the syringe and the petals is released by inward movement, and the plunger rod drives the syringe seat to move downward, so that self-destruction can be achieved. The technical scheme is as follows:

the embodiment of the utility model provides a direct-pushing self-destruction safety syringe, which comprises a vertically arranged syringe 1, a needle head seat 2 which is arranged at the top in the syringe 1 and can move downwards, a core rod 3 arranged in the syringe 1, a piston 4 arranged at the top of the core rod 3 and a tenon 5 arranged at the top of the core rod 3, wherein the tenon 5 and the inner lower part of the needle head seat 2 are respectively provided with a locking convex ring 6 and an inner annular bulge 7 which are matched with each other; an extrusion ring 8 is arranged outside the tenon 5 and between the piston 4 and the needle head seat 2, a sealing ring 9 is arranged between the upper part of the needle head seat 2 and the syringe 1, the lower part of the needle head seat 2 is divided into a fixing part and a conical part 10 from top to bottom, an outer annular bulge 11 is coaxially arranged outside the fixing part, the outer diameter of the conical part 10 is gradually reduced from top to bottom to form an annular gap 12 with the inner wall of the syringe 1, an annular groove 13 matched with the outer annular bulge 11 is arranged at the inner upper part of the syringe 1, the outer annular bulge 11 is embedded into the annular groove 13 to fix the needle head seat 2 on the syringe 1, a stopping convex ring 14 is coaxially arranged in the syringe 1, and the top of the piston 4 abuts against the lower side of the stopping convex ring 14; the extrusion ring 8 can move up and down in the syringe 1, the bottom of the extrusion ring is propped against the upper side of the retaining convex ring 14, and the upper part of the extrusion ring is positioned in the annular gap 12 and is propped against the outer side of the conical part 10; the top of the core rod 3 is propped against the bottom of the extrusion ring 8 or is positioned below the bottom of the extrusion ring 8, and the lower part of the needle head seat 2 is composed of a plurality of annular and uniformly distributed flaps 15; after injection is completed, the core rod 3 is pushed upwards, the piston 4 deforms, the extrusion ring 8 moves upwards, the inner side of the upper portion of the extrusion ring abuts against the outer side of the conical portion 10, the flaps 15 bend inwards, the outer annular protrusion 11 is completely separated from the annular groove 13 due to the fact that the flaps 15 bend inwards, and meanwhile, the locking convex ring 6 penetrates through the inner annular protrusion 7 and is locked; then the core rod 3 is pulled downwards to drive the needle seat 2 to cross the backstop convex ring 14 downwards.

Specifically, the number of the flaps 15 in the embodiment of the present invention is 4.

Specifically, the outer diameter of the locking protrusion ring 6 in the embodiment of the present invention is larger than the inner diameter of the inner annular protrusion 7, the inner diameter of the retaining protrusion ring 14 is smaller than the diameter of the piston 4 and smaller than the outer diameter of the pressing ring 8, the outer diameter of the bottom of the tapered portion 10 is smaller than the inner diameter of the top of the pressing ring 8, the inner diameter of the pressing ring 8 is larger than the outer diameter of the locking protrusion ring 6, and the outer diameter of the outer annular protrusion 11 is larger than the inner diameter of the corresponding portion of the cylinder 1.

Specifically, the locking convex ring 6 in the embodiment of the present invention is a cone coaxially disposed at the top of the tenon 5, and the lower side of the inner annular protrusion 7 is obliquely disposed from bottom to top.

Preferably, the outer annular protrusion 11 in the embodiment of the present invention has an angular cross-section, an outer diameter of an upper side thereof is gradually increased from top to bottom, and a lower side thereof is horizontally disposed.

The top of the core rod 3 in the embodiment of the utility model is coaxially provided with a core rod head 16, the piston 4 is sleeved on the core rod head 16, and the tenon 5 is arranged at the top end of the core rod head 16; a pushing convex ring 17 is arranged at the top of the core rod head 16 and positioned at the top of the piston 4; the pushing convex ring 17 is arranged coaxially with the core rod 3, and the top surface of the pushing convex ring is a conical surface with a small upper part and a big lower part and is propped against the bottom of the extrusion ring 8; the top of the piston 4 is provided with a circular groove matched with the ejection convex ring 17.

The squeezing ring 8 in the embodiment of the utility model is a circular ring structure which is coaxial with the needle cylinder 1, the inner side of the top of the squeezing ring is propped against the conical part 10, the bottom of the squeezing ring is a conical surface matched with the top surface of the pushing convex ring 17, and the inner side of the bottom of the squeezing ring is coaxially provided with an inner convex edge 18; the inner diameter of the inner convex edge 18 is larger than the diameter of the tenon 5 and smaller than the outer diameter of the ejection convex ring 17.

Preferably, the top of the squeeze ring 8 in the embodiment of the present invention has both inner and outer arc-shaped surfaces.

Preferably, in the embodiment of the present invention, the upper side of the retaining convex ring 14 is an arc-shaped surface, and the inner diameter thereof gradually increases from top to bottom, and the lower side thereof is an inclined straight surface, and the inner diameter thereof gradually increases from bottom to top; and a notch 19 matched with the upper side of the retaining convex ring 14 is formed in the outer side of the bottom of the extrusion ring 8, and the notch 19 abuts against the upper side of the retaining convex ring 14.

The technical scheme provided by the embodiment of the utility model has the following beneficial effects: the embodiment of the utility model provides a direct-push self-destruction safety syringe, which is characterized in that after injection is finished, the syringe is continuously pushed upwards, the connection between the syringe and a valve is released by inward movement of a valve, and a needle cylinder seat is driven by a core rod to move downwards to realize self-destruction.

Drawings

FIG. 1 is a schematic structural view of a direct-push self-destruct safety syringe according to an embodiment of the present invention after completion of injection;

FIG. 2 is a schematic view of the structure of FIG. 1 as the core rod continues to be pushed upward;

FIG. 3 is a schematic view of the structure of FIG. 2 during pulling down of the core rod;

FIG. 4 is a schematic view of the structure of the syringe;

FIG. 5 is a schematic structural view of a core rod;

FIG. 6 is a schematic view of the needle mount;

FIG. 7 is a cross-sectional view of the needle mount;

FIG. 8 is a bottom view of the needle mount;

fig. 9 is a schematic view of the structure of the pressing ring.

In the figure: 1 syringe, 2 needle seat, 3 core bar, 4 piston, 5 tenon, 6 locking convex ring, 7 inner annular bulge, 8 extruding ring, 9 sealing ring, 10 conical part, 11 outer annular bulge, 12 annular gap, 13 annular groove, 14 backstop convex ring, 15 lamella, 16 core bar head, 17 ejection convex ring, 18 inner convex edge, 19 gap.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1-9, the embodiment of the present invention provides a direct-pushing self-destruction safety syringe, which includes a vertically disposed syringe 1, a needle holder 2 (disposed coaxially with the syringe 1, having an outer diameter slightly smaller than the inner diameter of the syringe 1, and a hollow structure at the lower part thereof) disposed at the top part of the syringe 1, a core rod 3 (disposed coaxially with the syringe 1) disposed in the syringe 1, a plunger 4 (disposed coaxially with the core rod 3 and having a certain deformability) disposed at the top part of the core rod 3, a tenon 5 (disposed coaxially with the core rod 3) disposed at the top part of the core rod 3, and the like, wherein a locking convex ring 6 (disposed coaxially with the tenon 5) and an inner annular protrusion 7 (disposed coaxially with the needle holder 2) are respectively disposed at the inner lower part of the tenon 5 and the needle holder 2, and the locking convex ring 6 can pass through the inner annular protrusion 7 and be locked. The foregoing structure is substantially the same as that of the existing safety syringe, except that: in this embodiment, a squeezing ring 8 is disposed outside the tenon 5 and between the piston 4 and the needle base 2, and the squeezing ring 8 is disposed coaxially with the syringe 1. A sealing ring 9 is arranged between the upper part of the needle head seat 2 and the needle cylinder 1, the outer side of the upper part of the needle head seat 2 is coaxial with a sealing ring groove, and the sealing ring 9 is embedded into the sealing ring groove. The lower part of syringe needle seat 2 from top to bottom divide into fixed part (be used for with cylinder 1 fixed) and toper portion 10 (be used for guiding 15 inward movements of lamella, for big-end-up's conical structure), the outside of fixed part is coaxial to be equipped with outer annular protrusion 11, the external diameter of toper portion 10 reduces gradually from top to bottom and forms annular gap 12 with 1 inner wall of cylinder, upper portion is equipped with in cylinder 1 with outer annular protrusion 11 complex annular 13 (with the coaxial setting of cylinder 1), fix syringe needle seat 2 on cylinder 1 in outer annular protrusion 11 embedding annular 13. A retaining collar 14 (located below the ring groove 13) is coaxially provided in the barrel 1, and the top of the piston 4 abuts against the underside of the retaining collar 14 to prevent the piston 4 from continuing to move upward after the injection is completed. The pressing ring 8 (having an outer diameter slightly smaller than the inner diameter of the cylinder 1) can move up and down in the cylinder 1, with its bottom abutting against the upper side of the backstop collar 14 (to prevent downward movement) and its upper part in the annular space 12 and abutting against the outside of the cone 10 (to fix the pressing ring 8). The top of the core rod 3 is abutted against the bottom of the extrusion ring 8 or is positioned below the bottom of the extrusion ring 8 so that the extrusion ring 8 can move upwards when the core rod 3 moves upwards, the lower part of the needle base 2 is composed of a plurality of (3-6) annularly and uniformly distributed flaps 15, the upper ends of the flaps 15 are fixed on the upper part of the needle base 2, the fixing part and the conical part 10 are respectively arranged on the middle part and the lower part of the outer side of the flaps 15, and the inner annular bulge 7 is arranged on the upper part of the inner side of the flaps 15 (so as to reduce the influence of the flaps 15 when being bent).

After injection is completed (when the piston 4 reaches a zero line at the top of the syringe 1), the core rod 3 is pushed upwards, the piston 4 deforms, the core rod 3 can slightly move upwards and drive the extrusion ring 8 to move upwards, the extrusion ring 8 moves upwards, the inner side of the upper part of the extrusion ring abuts against the outer side of the conical part 10, the flaps 15 are bent inwards (the lower parts of the flaps 15 all move inwards, so that the outer annular protrusion 11 on the extrusion ring moves inwards), the flaps 15 bend inwards, so that the outer annular protrusion 11 (to the inner side of the inner wall corresponding to the syringe 1, preferably to the inner side of the backstop convex ring 14) is completely separated from the annular groove 13, and meanwhile, the locking convex ring 6 penetrates through the inner annular protrusion 7 and is locked to ensure that the core rod 3 can drive the needle head base 2 to move downwards. The core rod 3 is pulled downwards to drive the needle seat 2 to go downwards (under certain pulling force) over the backstop convex ring 14 (with smaller height so as to go over).

Specifically, the number of the flaps 15 in the embodiment of the present invention is 4.

Specifically, the outer diameter of the locking protrusion ring 6 in the embodiment of the present invention is larger than the inner diameter of the inner annular protrusion 7, the inner diameter of the backstop protrusion ring 14 is smaller than the diameter of the piston 4 and smaller than the outer diameter of the squeeze ring 8, the outer diameter of the bottom of the tapered portion 10 is smaller than the inner diameter of the top of the squeeze ring 8, the inner diameter of the squeeze ring 8 is larger than the outer diameter of the locking protrusion ring 6 to facilitate the passage of the upper tenon 5, and the outer diameter of the outer annular protrusion 11 is larger than the inner diameter of the corresponding portion of the cylinder 1.

Specifically, referring to fig. 1-3 and 5, the locking convex ring 6 in the embodiment of the present invention is a cone (with a small top and a large bottom) coaxially disposed at the top of the tenon 5, and the lower side of the inner annular protrusion 7 is disposed obliquely from bottom to top so that the locking convex ring 6 passes upward.

Preferably, with reference to figures 1-3 and 6-8, the outer annular projection 11 in the embodiment of the utility model is angular in section, with an upper external diameter which increases gradually from top to bottom to form a conical surface (with a small angle (for example less than 15 °) with the axis of the needle holder 2) to facilitate the mounting of the needle holder 2, and with its lower side arranged horizontally. Accordingly, the cross-sectional shape of the ring groove 13 is also angular.

Referring to fig. 1-3 and 5, a core rod head 16 (similar to a conventional structure) is coaxially disposed on the top of the core rod 3 in the embodiment of the present invention, the piston 4 is sleeved on the core rod head 16, and the tenon 5 is disposed at the top end of the core rod head 16. The top of the core rod head 16 and the top of the piston 4 are provided with a push convex ring 17 (the top end is exposed out of the piston 4) so as to push the extrusion ring 8. The pushing convex ring 17 is arranged coaxially with the core rod 3, and the top surface of the pushing convex ring is a conical surface with a small upper part and a big lower part (which is flush with the top surface of the piston 4) and is pushed against the bottom of the extrusion ring 8. The top of the piston 4 is provided with a circular groove matched with the ejection convex ring 17 for accommodating the ejection convex ring 17 (sealing is required).

Referring to fig. 1-3 and 9, the pressing ring 8 in the embodiment of the present invention is a circular ring structure disposed coaxially with the syringe 1, and has a top portion with an inner side abutting against the outer side of the tapered portion 10, a bottom portion with a tapered surface matching with the top surface (tapered surface) of the pushing convex ring 17, and a bottom portion with an inner flange 18 disposed coaxially with the inner side for being pushed. The inner rim 18 has an inner diameter larger than the diameter of the tenon 5 (and also larger than the outer diameter of the locking collar 6) and smaller than the outer diameter of the ejector collar 17.

Preferably, the top of the squeeze ring 8 in this embodiment of the utility model is curved on both the inside and outside to facilitate the squeeze ring 8 pushing the flaps 15 up through the anti-backup collar 14 (when installed).

Preferably, referring to fig. 1-4, the anti-back protruding ring 14 in the embodiment of the present invention has an upper side with an arc-shaped surface and an inner diameter gradually increasing from top to bottom so that other structures can pass over the anti-back protruding ring 14 downward, and has a lower side with an inclined straight surface and an inner diameter gradually increasing from bottom to top so that other structures can pass over the anti-back protruding ring 14 upward. The bottom outer side of the extrusion ring 8 is provided with a notch 19 (ring shape) matched with the upper side of the retaining convex ring 14, and the notch 19 is propped against the upper side of the retaining convex ring 14.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (9)

1. The direct-pushing self-destruction safety syringe comprises a vertically arranged syringe (1), a needle head seat (2) which is arranged at the inner top of the syringe (1) and can move downwards, a core rod (3) arranged in the syringe (1), a piston (4) arranged at the top of the core rod (3) and a tenon (5) arranged at the top of the core rod (3), wherein a locking convex ring (6) and an inner annular bulge (7) which are matched with each other are respectively arranged at the inner lower parts of the tenon (5) and the needle head seat (2); it is characterized in that the preparation method is characterized in that,

the needle is characterized in that an extrusion ring (8) is arranged outside the tenon (5) and between the piston (4) and the needle seat (2), a sealing ring (9) is arranged between the upper part of the needle seat (2) and the needle cylinder (1), the lower part of the needle seat (2) is divided into a fixing part and a conical part (10) from top to bottom, an outer annular bulge (11) is coaxially arranged outside the fixing part, the outer diameter of the conical part (10) is gradually reduced from top to bottom to form an annular gap (12) with the inner wall of the needle cylinder (1), an annular groove (13) matched with the outer annular bulge (11) is arranged on the inner upper part of the needle cylinder (1), the outer annular bulge (11) is embedded into the annular groove (13) to fix the needle seat (2) on the needle cylinder (1), a stopping convex ring (14) is coaxially arranged in the needle cylinder (1), and the top of the piston (4) abuts against the lower side of the stopping convex ring (14); the extrusion ring (8) can move up and down in the needle cylinder (1), the bottom of the extrusion ring is propped against the upper side of the backstop convex ring (14), and the upper part of the extrusion ring is positioned in the annular gap (12) and is propped against the outer side of the conical part (10); the top of the core rod (3) is propped against the bottom of the extrusion ring (8) or is positioned below the bottom of the extrusion ring (8) in an adjacent way, and the lower part of the needle head seat (2) is composed of a plurality of annular and uniformly distributed flaps (15);

after injection is finished, the core rod (3) is pushed upwards, the piston (4) deforms, the extrusion ring (8) moves upwards, the inner side of the upper portion of the extrusion ring abuts against the outer side of the conical portion (10) to enable the flaps (15) to bend inwards, the flaps (15) bend inwards to enable the outer annular protrusion (11) and the annular groove (13) to be completely separated, and meanwhile, the locking convex ring (6) penetrates through the inner annular protrusion (7) and is locked; then the core rod (3) is pulled downwards to drive the needle head seat (2) to go over the backstop convex ring (14) downwards.

2. The direct push self-destruct safety syringe according to claim 1, characterized in that the number of said petals (15) is 4.

3. The direct-push self-destruction safety syringe according to claim 1, wherein the locking collar (6) has an outer diameter larger than the inner diameter of the inner annular protrusion (7), the backstop collar (14) has an inner diameter smaller than the diameter of the piston (4) and smaller than the outer diameter of the squeeze ring (8), the bottom of the cone (10) has an outer diameter smaller than the inner diameter of the top of the squeeze ring (8), the squeeze ring (8) has an inner diameter larger than the outer diameter of the locking collar (6), and the outer diameter of the outer annular protrusion (11) is larger than the inner diameter of the corresponding site of the syringe (1).

4. The direct-push self-destruction safety syringe according to claim 1, wherein the locking convex ring (6) is a cone coaxially arranged on the top of the tenon (5), and the lower side of the inner annular protrusion (7) is obliquely arranged from bottom to top.

5. The direct push self-destruct safety syringe according to claim 1, characterized in that the external annular protrusion (11) has an angular cross-section, with the external diameter of its upper side gradually increasing from top to bottom and its lower side lying horizontally.

6. The direct-push self-destruction safety syringe according to claim 1, wherein a core rod head (16) is coaxially arranged on the top of the core rod (3), the piston (4) is sleeved on the core rod head (16), and the tenon (5) is arranged at the top end of the core rod head (16); a pushing convex ring (17) is arranged at the top of the core rod head (16) and positioned at the top of the piston (4); the ejection convex ring (17) is coaxial with the core rod (3), and the top surface of the ejection convex ring is a conical surface with a small upper part and a large lower part and abuts against the bottom of the extrusion ring (8); the top of the piston (4) is provided with a circular groove matched with the ejection convex ring (17).

7. The direct-push self-destruction safety syringe according to claim 6, wherein the squeezing ring (8) is a circular ring structure coaxially arranged with the syringe (1), the top inner side of the squeezing ring is abutted against the conical part (10), the bottom of the squeezing ring is a conical surface matched with the top surface of the pushing convex ring (17), and the bottom inner side of the squeezing ring is coaxially provided with an inner convex edge (18); the inner diameter of the inner convex edge (18) is larger than the diameter of the tenon (5) and smaller than the outer diameter of the ejection convex ring (17).

8. The direct-push self-destruction safety syringe according to claim 7, wherein the top of the squeeze ring (8) has an arc-shaped inner side and an arc-shaped outer side.

9. The direct-push self-destruction safety syringe according to claim 1, wherein the stopping convex ring (14) has an arc-shaped upper side and gradually increases the inner diameter from top to bottom, and has an inclined straight lower side and gradually increases the inner diameter from bottom to top; the bottom outer side of the extrusion ring (8) is provided with a notch (19) matched with the upper side of the retaining convex ring (14), and the notch (19) is abutted against the upper side of the retaining convex ring (14).

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