CN213312509U - Active self-locking type safety syringe - Google Patents

Abstract

The utility model discloses an active self-locking safety injector, which comprises a needle cylinder, a needle seat, an injection needle, a needle point protecting jacket, a spring, a guiding and limiting component, an initial butt component and a triggering ring plug, wherein the initial butt component comprises a butt groove which runs through the outer wall of the needle cylinder, and one end of the butt groove close to a patient end is a butt end face; elastic arm, elastic arm's one end fixed connection are sheathe in the needle point protective sheath, the other end be provided with the butt piece of butt groove adaptation, the butt piece face be equipped with butt terminal surface butt complex butt face to one side of butt terminal surface, elastic arm extends to the butt piece that is close to patient end one side, the utility model discloses it is rational in infrastructure, guaranteed that the elasticity section can also exert radial inward pressure to the butt piece when exerting axial pressure to the butt piece, prevent the radial outside roll-off butt groove of butt piece, cause the false triggering of needle point protective sheath, and then improved this initiative auto-lock safety syringe's security.

Description

Active self-locking type safety syringe

Technical Field

The utility model relates to a safe formula syringe field, in particular to initiative is from locking-type safe syringe.

Background

Chinese patent CN 209301904U discloses an active self-locking safety syringe, which is characterized in that a trigger ring plug arranged in a trigger cavity is used to trigger and release a needle point protection sleeve from the inside of a needle cylinder close to a patient end, so as to achieve the technical purpose of preventing the exposure of the needle point and self-locking.

In the patent specification, the elastic arm of the initial clamping component extends from one side of the needle tip protecting sleeve close to the patient end to one side close to the patient, and when the needle tip protecting sleeve is kept in a non-triggering state, the clamping block and the clamping groove which are located at the free end of the elastic arm are clamped. In the practical application process, when the needle tip protective sleeve is subjected to the pulling force towards the patient end, the elastic arm deforms, and the free end of the elastic arm is radially outwards opened, so that the clamping block is separated from the clamping groove, the needle tip protective sleeve is mistakenly triggered, and the safety performance is insufficient. Meanwhile, the needle point protective sleeve is required to be provided with a slotted hole for accommodating the extending of the check arm, the slotted hole penetrates through the side wall of the needle point protective sleeve close to the patient end, in the ejection process of the needle point protective sleeve, the check arm is pulled away from the slotted hole, part of the spring can be pulled out from the slotted hole, and the spring cannot be completely limited by the side wall of the needle point protective sleeve in the radial direction, even can extrude the injection needle, so that the distortion of the injection needle is caused, and the safe use of the injector is further influenced.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that in the practical application process of the initial clamping component in the existing active self-locking safety syringe, when the needle tip protective sleeve is subjected to a pulling force towards a patient, the clamping block and the clamping groove are separated, so that the needle tip protective sleeve is triggered by mistake, and the safety performance is insufficient; meanwhile, the adopted non-return component needs to form a slotted hole penetrating through the needle cylinder on the side wall of the bullet needle tip protective sleeve close to the patient end, and the spring cannot be completely limited by the side wall of the bullet needle tip protective sleeve in the radial direction, so that part of the spring is separated from the slotted hole, the distortion of the injection needle is caused, and the safe use of the injector is further influenced.

In order to solve the problem, the utility model provides an initiative is from locking-type safety syringe includes cylinder, piston assembly, needle file, syringe needle, needle point lag, spring, the spacing subassembly of direction, trigger part and trigger the ring stopper at least, still includes initial butt subassembly, initial butt subassembly includes at least: the abutting groove penetrates through the outer wall of the needle cylinder, and one end, close to the patient end, of the abutting groove is an abutting end face; the needle point protective sleeve comprises an elastic arm, one end of the elastic arm is fixedly connected to the needle point protective sleeve, the other end of the elastic arm is provided with a butt joint block matched with the butt joint groove, one side, facing the butt joint end face, of the butt joint block is provided with a butt joint face matched with the butt joint end face in a butt joint mode, and the elastic arm extends from a fixed end on one side far away from the patient end to the butt joint block on one side close to the patient end.

Furthermore, the abutting block extends radially inwards to form a back stop step back to the patient end, a back stop arm is correspondingly arranged on the outer side of the patient end of the needle cylinder, and the end part of the back stop arm is matched with the back stop step.

Further, the piston assembly comprises a piston rod and a piston arranged at the end of the piston rod, and the end of the piston rod is a pushing part used for pushing the trigger ring plug.

Furthermore, a mutually matched embedding mechanism is arranged between one end of the needle seat far away from the patient end and one end of the piston rod close to the needle seat.

Furthermore, the guide limiting component comprises a convex column arranged on the outer wall of the needle cylinder and a guide limiting groove arranged on the side wall of the needle point protecting sleeve, and the convex column is matched with the guide limiting groove.

Further, trigger portion includes the trigger arm of being connected with one side that butt groove face kept away from the butt terminal surface, the trigger arm has elasticity, and under the initial condition, the free end of trigger arm is located the radial direction's of butt piece inboard.

Furthermore, the active self-locking safety syringe further comprises a needle point protective cap sleeved outside the needle point protective sleeve, and the needle point protective cap covers the free end of the elastic arm in an initial state.

Furthermore, the inner side wall of the needle tip protective cap is provided with a convex part corresponding to the abutting groove along the circumferential direction.

By adopting the technical scheme, the needle point protecting sleeve is kept in an un-triggered state by setting the initial abutting component, one end of the elastic arm is fixedly connected to the needle point protecting sleeve, and the elastic arm extends from the fixed end on one side far away from the patient end to the abutting block on one side close to the patient end, so that the elastic section can apply axial pressure to the abutting block and also apply radial inward pressure to the abutting block, the abutting block is extruded inwards in the radial direction, the abutting block is prevented from sliding out of the abutting end face outwards in the radial direction, the false triggering of the needle point protecting sleeve is caused, and the safety of the syringe is further improved; meanwhile, the end part of the non-return arm is matched with the back-blocking step surface, the protective needle sleeve is prevented from retracting under the protection state, a slotted hole is prevented from being formed in the side wall of the needle tip protective sleeve close to the patient end, the spring is completely limited by the side wall of the needle tip protective sleeve in the radial direction, and the influence of the spring on the injection needle when the needle tip protective sleeve triggers and ejects is prevented.

Drawings

Fig. 1 is a schematic structural diagram of the active self-locking safety syringe in this embodiment;

fig. 2 is a schematic structural diagram of the active self-locking safety syringe in an explosion state according to the embodiment;

FIG. 3 is a schematic structural diagram of a syringe in the active self-locking safety injector according to this embodiment;

FIG. 4 is a partial cross-sectional view of a syringe in the active self-locking safety injector according to the present embodiment;

FIG. 5 is a partial cross-sectional view of the active self-locking safety syringe in an initial state according to the present embodiment;

FIG. 6 is an enlarged view of area A of FIG. 5;

FIG. 7 is a partial schematic view of the engagement between the abutting block and the abutting groove of the active self-locking safety syringe according to the present embodiment;

fig. 8 is a schematic structural view of a needle tip protection sleeve in the active self-locking safety syringe according to the embodiment;

fig. 9 is a partial sectional view of the active self-locking safety syringe in the protection state.

Reference numerals: 10. a needle cylinder; 11. a convex column; 12. a butt joint groove; 13. abutting the end face; 14. a trigger arm; 15. a check arm; 16. a needle seat; 17. a spring cavity; 18. a trigger chamber; 19. an outer conical surface; 20. a piston rod; 21. a pushing section; 22. a piston ring groove; 23. a piston; 24. a tapered groove; 30. a needle tip protecting sleeve; 31. A guide limit groove; 32. a resilient arm; 33. a butting block; 34. an abutting surface; 35. a back stop step surface; 36. A through groove; 37. a step surface; 40. a needle tip protective cap; 41. a convex portion; 50. triggering a ring plug; 60. an injection needle; 70. a spring.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may include, for example, a fixed connection, an integral connection, or a detachable connection; may be communication within two elements; they may be directly connected or indirectly connected through an intermediate, and those skilled in the art can understand the specific meaning of the above terms in the present invention in specific situations.

As shown in fig. 1 and 2, the active self-locking safety syringe of the present embodiment includes a barrel 10, a piston assembly, an injection needle 60, a needle tip protection cover 30, a spring 70, and a needle tip protection cap 40. In this embodiment, for the convenience of explanation, one end of the injection needle 60 of the active self-locking safety syringe is defined as the patient end, and the state when the needle tip protection cover 30 is not triggered is referred to as the initial state.

In the present embodiment, in which the piston assembly is assembled in the syringe 10, the structure thereof is shown in fig. 2 and 5, and comprises a piston rod 20 and a piston 23, wherein one end of the piston rod 20 near the patient end is provided with a piston ring groove 22, and the piston 23 is sleeved in the piston ring groove 22, wherein the piston 23 and the piston rod 20 are the piston 23 and the piston rod 20 commonly used in the prior art, the piston 23 is made of flexible material and is sealed with the inner wall of the syringe 10, and the suction and injection of the liquid medicine are realized by the push-and-pull of the piston assembly.

Wherein, the end of the piston rod 20 is provided with a pushing portion 21, the pushing portion 21 is used for pushing the trigger ring plug 50 to move axially, and the end surface of the pushing portion 21 is adapted to the end surface of the trigger ring plug 50.

As a modification of this embodiment, as shown in FIG. 4, the hub 16 is secured within the barrel 10 adjacent the patient end, the injection needle 60 is secured to the hub 16 and the needle tip extends from the patient end of the barrel 10. The fixed connection between the outer wall of the hub 16 and the inner wall of the barrel 10 defines a spring chamber 17 adjacent the patient end and a trigger chamber 18 adjacent the plunger assembly.

In a preferred embodiment, as shown in fig. 5 and 9, a matching engaging mechanism is provided between the end of the needle holder 16 away from the patient and the end of the plunger rod 20 close to the needle holder 16 for reducing the residual amount of the medicinal liquid during the injection. Preferably, the engagement means comprises an external tapered surface 19 provided at the end of the needle hub 16 and a tapered groove 24 at the end of the plunger rod 20. Of course, the tapered groove 24 may be provided at the end of the needle holder 16 and the outer tapered surface 19 at the end of the piston rod 20. The outer tapered surface 19 and the tapered groove 24 may also be an outer arc surface or an arc groove. All technical means which are the same as the technical idea of the embedding mechanism in the embodiment and are equivalent to the technical solution in the field are regarded as the equivalent technical solution of the present application.

As shown in fig. 4 and 5, a trigger ring plug 50 is installed in the trigger chamber 18, the inner wall of the trigger ring plug 50 is sealed with the outer wall of the needle seat 16, and the outer wall of the trigger ring plug 50 is sealed with the inner wall of the needle cylinder 10. In the present embodiment, the trigger ring plug 50 is axially movable in the trigger chamber 18, and the movement of the trigger ring plug 50 is realized by the pushing of the pushing portion 21.

In this embodiment, as shown in fig. 5 and 6, the needle tip protector 30 is used to cover the used injection needle 60, and the needle tip protector 30 is in an initial state mounted on the patient end of the syringe 10. Wherein a spring 70 is arranged between the needle tip shielding 30 and the needle cylinder 10, the spring 70 is arranged in the spring cavity 17, and one end of the spring 70 close to the needle tip is contacted with the needle tip shielding 30. In the initial state, the spring 70 is in a compressed energy storage state to provide a pre-elastic force for the ejection of the needle tip protective sheath 30.

In this embodiment, an initial abutment assembly is provided between the needle tip shielding 30 and the barrel 10 for maintaining the needle tip shielding 30 in a non-activated state. As shown in fig. 5, 6, 7 and 8, the initial abutment assembly comprises: abutting the groove 12 and the resilient arm 32. The abutment groove 12 penetrates the outer wall of the cylinder 10, and an abutment end face 13 is provided at one end of the abutment groove 12 close to the patient end. The outer wall of the needle tip protector on the side remote from the patient end is provided with a through slot 36, and the elastic arm 32 is positioned in the through slot 36. One end of the elastic arm 32 is fixedly connected to the needle tip protecting sleeve 30, the other end of the elastic arm is provided with an abutting block 33 matched with the abutting groove 12, one side of the abutting block 33 facing the abutting end face 13 is provided with an abutting face 34 in abutting fit with the abutting end face 13, and the elastic arm 32 extends from the fixed end on the side far away from the patient end to the abutting block 33 on the side close to the patient end.

In the initial state, the abutment end face 13 is brought into close contact with the abutment face 34 by the action of the preload of the spring 70. In the axial direction, when the needle tip protection sleeve 30 is pulled axially towards the patient end, the pressure F1 exerted by the abutment end face 13 on the abutment block 33 opposite to the patient end increases, and at this time, the elastic arm 32 exerts the pressure F4 on the abutment block 33 facing the patient end, so that the abutment block 33 is in a state of rest under the stress balance. The needle tip protecting cover 30 is also entirely fitted over the outside of the syringe 10, whereby the resilient arms 32 exert a radial inward pressure F3 on the abutment block 33 at the same time as an axial pressure F4 is exerted on the abutment block 33, so that the abutment block 34 is pressed radially inward and the abutment block 33 is slightly moved inward. When the needle tip protection sleeve 30 is pulled axially towards the patient, the initial abutment assembly can effectively prevent the abutment block 33 from moving radially outwards to slide out of the abutment groove 12, which may cause false triggering of the needle tip protection sleeve 30.

It should be noted that the abutment slot 12 is located on the outside wall of the barrel 10 where the firing chamber 18 is located, and there is also provided a trigger portion inside the barrel that triggers from inside the firing chamber 18 to disengage the initial abutment assemblies from each other. Preferably, the trigger part comprises a trigger arm 14 connected to a side of the abutting groove 12 away from the abutting end surface 13, the trigger arm 14 has elasticity, and in an initial state, as shown in fig. 4, a free end of the trigger arm 14 is located at an inner side of the abutting block in a radial direction.

In a preferred embodiment, as shown in fig. 1, a guiding and limiting assembly is provided between the needle tip protecting cover 30 and the needle cylinder 10, and the guiding and limiting assembly is used for limiting the axial movement direction and the limiting position of the needle tip protecting cover 30 relative to the needle cylinder 10 after being triggered. Preferably, the guiding and limiting assembly in this embodiment includes a convex pillar 11 disposed on the outer wall of the needle cylinder 10 and a guiding and limiting groove 31 disposed on the side wall of the needle tip protecting sleeve 30, wherein the convex pillar 11 is adapted to the guiding and limiting groove 31 for limiting the relative rotation between the needle tip protecting sleeve 30 and the needle cylinder 10, and can only move along the axial direction, and the end of the guiding and limiting groove 31 limits the limit position of the axial movement of the needle tip protecting sleeve 30.

In the initial state, the trigger ring 50 of the active self-locking safety syringe of this embodiment is located in the trigger chamber 18 and in the initial state the trigger ring 50 is not in contact with the trigger but is not sufficient to disengage the initial abutment components from each other. In use, the piston assembly is first moved to the end away from the needle tip to draw the medical fluid into the barrel 10. During the injection, the piston assembly moves towards one end of the needle point, during the pushing process of the piston assembly, the pushing portion 21 firstly contacts with the trigger ring plug 50, and continuously pushes the trigger ring plug 50 to move axially after the contact, the trigger ring plug 50 drives the trigger arms 14 to gradually expand outwards, the trigger arms 14 drive the abutting blocks 33 to gradually deform outwards in the radial direction, so that the end portions of the abutting blocks 34 are separated from the abutting end faces 13. The end of the abutting block 33 and the abutting end face 13 are completely separated when the injection of the liquid medicine is completed, at this time, because the injection needle 60 is not pulled out from the skin of the patient, the patient end of the needle point protection sleeve 30 is contacted with the skin of the patient, and in the process of pulling the injection needle 60 out from the skin of the patient, the potential energy stored by the spring 70 is released to drive the needle point protection sleeve 30 to cover the used injection needle 60, so that the injection needle 60 is prevented from being exposed to hurt people, and self-locking is realized.

As a modification of this embodiment, as shown in FIG. 9, the abutment block 33 of the resilient arm 32 extends radially inwardly to form a backstop step surface 35 facing away from the patient end, and a backstop arm 15 is correspondingly provided outside the patient end of the syringe 10, the end of the backstop arm 15 being fitted with the backstop step surface 35. In the needle tip protection state, when the needle tip protection sleeve 30 retreats back to the patient end, the backstop step surface 36 is abutted against the end part of the backstop arm 15, so that the needle tip protection sleeve 30 can be effectively prevented from retreating, and the protection reliability is good. Preferably, the end of the check arm 15 is wedge-shaped, and the check step surface 35 is provided with a wedge-shaped groove adapted thereto. Not only can the needle point protecting sleeve 30 be prevented from returning, but also the needle point protecting sleeve 30 can be prevented from radially shaking.

The needle tip protective cap 40 covers the free end of the resilient arm 32 when mounted on the needle tip protective cover 30. The purpose of this arrangement is to prevent the trigger ring 50 from entering the trigger space inside the trigger arm 14 even if the piston rod 20 is pushed, since the elastic arm 32 is pressed without a deformation space, and to prevent the needle tip protection shield 30 from being triggered by mistake.

In a preferred embodiment, as shown in fig. 6, the needle tip protective cap 40 is disposed over the needle tip protective sheath 30. preferably, the needle tip protective sheath 30 is further provided with a step surface 37 for engaging with an end of the needle tip protective cap 40. The needle tip protective cap 40 covers the free end of the resilient arm 32 when mounted on the needle tip protective cover 30. The purpose of this arrangement is to prevent the trigger ring 50 from entering the trigger space inside the trigger arm 14 even if the piston rod 20 is pushed, since the elastic arm 32 is pressed without a deformation space, and to prevent the needle tip protection shield 30 from being triggered by mistake. Further, a convex portion 41 corresponding to the contact groove 12 is provided on the inner side wall of the needlepoint protective cap in the circumferential direction, and the convex portion 41 is engaged with the contact groove 12, so that the needlepoint protective cap is more firmly fixed to the needlepoint preventing cover.

It should be noted that, in this embodiment, the quantity of direction spacing subassembly, initial block subassembly and non return part is two sets of, sets up along the circumferencial direction equipartition. Of course, this is only a preferred embodiment, and the number of the guiding and limiting assemblies, the initial engaging assemblies and the non-return parts may be one or more than three groups, and in the case of more than three groups, the guiding and limiting assemblies, the initial engaging assemblies and the non-return parts are distributed along the circumferential direction, and preferably are uniformly distributed along the circumferential direction.

In summary, the above description is only a preferred embodiment of the present invention and should not be taken as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention should be included within the scope of the present invention.

Claims (8)

1. The utility model provides an initiative is from locking-type safety syringe, includes cylinder (10), piston assembly, needle file (16), syringe needle (60), needle point lag (30), spring (70), the spacing subassembly of direction, trigger part and trigger ring stopper (50) at least, its characterized in that still includes initial butt subassembly, initial butt subassembly includes at least:

the abutting groove (12), the abutting groove (12) penetrates through the outer wall of the needle cylinder (10), and one end, close to the patient end, of the abutting groove (12) is an abutting end face (13);

elastic arm (32), the one end fixed connection of elastic arm (32) is on needle point lag (30), the other end be provided with butt piece (33) of butt groove (12) adaptation, butt piece (33) towards one side of butt terminal surface (13) be equipped with butt terminal surface (13) butt complex butt face (34), elastic arm (32) extend to butt piece (33) that is close to patient end one side from the stiff end of keeping away from patient end one side.

2. An active self-locking safety syringe according to claim 1, characterized in that the abutment block (33) extends radially inward to form a backstop step surface (36) facing away from the patient end, and a backstop arm (15) is correspondingly arranged outside the patient end of the syringe (10), and the end of the backstop arm (15) is matched with the backstop step surface (36).

3. An active self-locking safety syringe according to claim 2, characterized in that the piston assembly comprises a piston rod (20) and a piston (23) arranged at the end of the piston rod (20), the end of the piston rod (20) is a pushing part (21) for pushing the trigger ring plug (50).

4. An active self-locking safety syringe according to claim 3 characterized in that there are mating engagement means between the end of the hub (16) remote from the patient and the end of the plunger rod (20) near the hub (16).

5. The active self-locking safety syringe according to claim 4, wherein the guiding and limiting assembly comprises a convex column (11) arranged on the outer wall of the syringe (10) and a guiding and limiting groove (31) arranged on the side wall of the needle point protecting sleeve (30), and the convex column (11) is matched with the guiding and limiting groove (31).

6. Active self-locking safety syringe according to claim 5, characterized in that the trigger part comprises a trigger arm (14) connected to the side of the abutment groove (12) remote from the abutment end face (13), the trigger arm (14) being resilient, the free end of the trigger arm (14) being located radially inside the abutment block (33) in the initial state.

7. Active self-locking safety syringe according to claim 6, further comprising a needle tip protective cap (40) sleeved outside the needle tip protective sheath (30), wherein the needle tip protective cap (40) covers the free end of the elastic arm (32) in an initial state.

8. Active self-locking safety syringe according to claim 7, characterized in that the needle tip protective cap (40) has a protrusion (41) around the circumference which engages with the abutment groove (12).

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