CN216725429U

CN216725429U - Injection device and safety protection device thereof

Info

Publication number: CN216725429U
Application number: CN202123140510.3U
Authority: CN
Inventors: 倪世利; 孙小峰; 徐千贺; 温泉; 汤华振
Original assignee: Shandong Weigao Prefills Pharmaceutical Packaging Co Ltd
Current assignee: Shandong Weigao Prefills Pharmaceutical Packaging Co Ltd
Priority date: 2021-12-14
Filing date: 2021-12-14
Publication date: 2022-06-14
Anticipated expiration: 2031-12-14

Abstract

The utility model discloses a safety protection device and an injection device, wherein the inner wall of the outer sleeve of the safety protection device is provided with a buckling part and a bearing part; the protective cover is movably arranged in the outer sleeve, the protective cover is provided with a hook claw which can be positioned and matched with the buckling part and a positioning seat which limits the protective cover to be separated from the outer sleeve, and the hook claw is separated from the buckling part and the positioning seat is contacted with the bearing part under the state that the protective cover covers the needle point; the release ring is movably arranged in the outer sleeve, one end of the release ring, facing the protective cover, can separate the hook claw from the buckling part by squeezing the hook claw, and one end of the release ring, facing away from the protective cover, is a positioning surface for positioning and contacting with the flange of the injector; two ends of the elastic component are respectively abutted against the release ring and the protective cover; a holder is coupled to the outer sleeve, the holder having holder inner jaws that limit movement of the syringe flange in a direction away from the release ring. The safety protection device does not interfere with the injection operation of the prefilled syringe, and prevents the protective cover from being ejected in advance.

Description

Injection device and safety protection device thereof

Technical Field

The utility model relates to the technical field of medical equipment, especially, relate to an injection device and safety device thereof.

Background

A pre-filled syringe for medical use includes a barrel having a hypodermic needle at one end and a plunger configured to move within the barrel such that an inward stroke of the plunger causes a substance contained within the barrel to be expelled from a needle aperture.

Safety syringes typically include some form of safety mechanism to protect the healthcare worker from the hypodermic needle after it is injected into the patient. A typical safety syringe may include a shield for covering the needle or the needle may be retracted into the barrel of the syringe.

To avoid the risk of accidental needle sticks, many prior art hypodermic syringes have rigid cylindrical shields that telescope over the syringe barrel. These shields are movable between a retracted position in which the needle is exposed for use, to an extended position in which the needle is surrounded by the shield.

Due to the risk of infection, a number of syringes and accompanying safety shields have been developed which are intended to prevent accidental needle sticks and/or inadvertent reuse of the syringe to provide safety protection. Conventional passive, needle stick prevention safety shields for pre-filled syringes must be mounted to the syringe. The safety shield means must not unduly interfere with the force required to move the plunger rod during injection nor interfere with the full stroke of the plunger rod so as not to interfere with the injection operation; it must also be possible to ensure that the administration has been completely completed (near the end of the plunger rod stroke) before the trigger is triggered, avoiding premature ejection of the shield.

Therefore, how to avoid the shield from being ejected in advance without interfering with the injection operation has become an urgent problem to be solved by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a safety device does not disturb the injection operation, avoids the protection casing to pop out in advance. The utility model also provides an injection device with above-mentioned safety device.

In order to solve the technical problem, the utility model provides a safety device, include:

the inner wall of the outer sleeve is provided with a first positioning part, and the outer edge of the push rod pressing end of the outer sleeve is provided with an elastic claw used for positioning and matching with the outer side surface of the syringe flange of the prefilled syringe;

the body sleeve is arranged at the ejection end of the protective cover of the outer sleeve and is provided with a second positioning part;

the protective cover is movably arranged in the outer sleeve and is provided with a first positioning protrusion capable of being matched with the first positioning part in a positioning mode and a second positioning protrusion for limiting the protective cover to fall out of the outer sleeve; in a state that the protective cover covers the needle tip of the prefilled syringe, the first positioning protrusion is separated from the first positioning part, and the second positioning protrusion is contacted with the second positioning part;

a release ring movably disposed within the outer sleeve; the end of the release ring facing the shield is capable of disengaging the first detent protrusion from the first detent by pushing the shield away from a pushing end of the needle tip of the pre-filled syringe; the end of the release ring facing away from the shield is a top raised ring for positioning contact with a syringe flange of a prefilled syringe;

and one end of the elastic component is abutted against the top raised ring, and the other end of the elastic component is abutted against the protective cover.

Optionally, in the safety shield apparatus described above, the outer sleeve has an outer flange on an outer wall thereof.

Optionally, in the safety shield apparatus, the outer sleeve further has a window penetrating through its inner wall and its outer wall;

the top raised ring is provided with an outer convex part extending towards the circumferential outer side of the top raised ring, and the outer convex part extends into the window; the male portion contacts an edge of the window proximate the shield in a state where the shield covers the needle tip of the pre-filled syringe.

Optionally, in the safety protection device, the second positioning portion is a hook, the protective cover further has a clamping step portion, and a step surface of the clamping step portion faces the release ring;

and under the state that the protective cover is not ejected out of the outer sleeve, the clamping hook is matched with the step surface of the clamping convex edge.

Optionally, in the safety device, the second positioning protrusion has a positioning protrusion structure and a hook protrusion structure;

and under the state that the protective cover covers the needle point of the prefilled syringe, the positioning bulge structure is contacted with the end face of the second positioning part facing the release ring, and the hook bulge structure is matched with the hook surface of the second positioning part.

Optionally, in the safety device, the body sleeve is connected to the outer sleeve in a snap-fit manner.

Optionally, in the safety device, the body sleeve has an outer sleeve connecting hook disposed toward the outer sleeve;

the inner wall of the outer sleeve is provided with a body sleeve clamping groove hole matched with the outer sleeve connecting clamping hook.

Optionally, in the safety protection device, an end of the body sleeve, which is away from the protective cover, is a conical structure, and a small end of the body sleeve is away from the protective cover.

Optionally, in the safety device, the elastic member is a spring.

The utility model also provides an injection device, including prefilling syringe and safety device, safety device is as above-mentioned arbitrary safety device.

The utility model provides a safety device can run through release ring, elastomeric element and protection casing in proper order with the syringe body of prefilling syringe to the syringe body sets up in the outer sleeve. The protection cover is limited to slide out from one end, far away from the release ring, of the outer sleeve through connection of the body sleeve and the outer sleeve, the elastic clamping jaws are matched with the outer side face of the syringe flange of the prefilled syringe in a positioning mode, the movement of the syringe flange towards the direction far away from the release ring is limited, and assembly of the safety protection device and the prefilled syringe is completed. During injection, the plunger of the pre-filled syringe is squeezed (squeezing force is injection pressure), and the syringe body is immobilized relative to the outer sleeve due to the flange of the syringe positioned to contact the top raised ring of the release ring, so that the plunger drives the plunger of the pre-filled syringe to move in the syringe body and squeeze the medicament in the syringe body towards the needle tip of the pre-filled syringe, and the medicament in the syringe body is injected into the patient. After the injection is finished, the pushing plug is in positioning contact with the end part of the syringe bottle body (the end of the syringe bottle body close to the needle point), and when the pushing plug cannot advance continuously relative to the needle point, the medicament in the syringe bottle body is completely discharged, and at the moment, a user can remove the needle point from the injection part. Then, the user only needs to extract the needle tip and then increase the pressure on the push rod (the pressure is larger than the injection pressure), so that the release ring and the protective cover approach each other by overcoming the elastic restoring force of the elastic component, namely, the flange of the syringe pushes the release ring to approach the protective cover, the release ring pushes the pushing end towards one end of the protective cover, so that the first positioning bulge is separated from the first positioning part, and under the action of the elastic restoring force of the elastic component, the protective cover moves towards the direction far away from the release ring, so that the protective cover covers the needle tip of the prefilled syringe; and under the contact action of the second positioning bulge and the second positioning part, the protective cover is limited to be separated from the outer sleeve. With the above arrangement, the safety shield does not interfere with the injection operation of the prefilled syringe. The prefilled syringe can be of a common syringe structure, does not need to be structurally changed, and is high in universality. Through the arrangement, the safety protection device does not interfere with injection operation and avoids the operation of popping up the protective cover in advance. And, the assembling operation is facilitated.

Drawings

Fig. 1 is a schematic structural view of an injection device provided by the present invention;

fig. 2 is a schematic perspective view of an injection device provided by the present invention;

fig. 3 is a schematic perspective view of the injection device provided by the present invention after the protective cover is released;

fig. 4 is a schematic view of a pre-filled syringe provided by the present invention;

fig. 5 is an exploded view of the injection device provided by the present invention;

FIG. 6 is a schematic perspective view of a safety shield apparatus provided in the present invention;

fig. 7 is a schematic cross-sectional view of a safety protection device provided by the present invention;

fig. 8 is a schematic structural view of the safety protection device provided by the present invention before triggering;

fig. 9 is a schematic structural view of the safety protection device provided by the present invention after triggering;

FIG. 10 is a schematic view of a first embodiment of an unreleased protective cover for a safety shield apparatus in accordance with the present invention;

FIG. 11 is a second schematic view of a safety shield apparatus according to the present invention;

fig. 12 is a schematic structural view of a safety shield release cover according to the present invention.

Detailed Description

The core of the utility model is to provide a safety device, do not disturb the injection operation, avoid the protection casing to pop out in advance. The utility model also provides an injection device with above-mentioned safety device.

In order to make the technical field better understand the solution of the present invention, the following detailed description of the present invention is provided with reference to the accompanying drawings and the detailed description.

As shown in fig. 1-12, the present invention provides a safety shield apparatus, which includes an outer sleeve 5, a body sleeve 6, a shield 7, a release ring 8, and an elastic member 9. The inner wall of the outer sleeve 5 has a first location 53, the outer edge of the push rod pressing end of the outer sleeve 5 has an elastic claw 51 for locating and matching with the outer side surface of the syringe flange 101 of the prefilled syringe 2; the body sleeve 6 is arranged at the ejection end of the protective cover of the outer sleeve 5, and the body sleeve 6 is provided with a second positioning part 62; the protective cover 7 is movably arranged in the outer sleeve 5, and the protective cover 7 is provided with a first positioning protrusion 71 which can be positioned and matched with the first positioning part 53 and a second positioning protrusion 72 which can limit the protective cover 7 to be separated from the outer sleeve 5; in a state where the shield 7 covers the needle tip 102 of the prefilled syringe 2, the first positioning projection 71 is separated from the first positioning portion 53 and the second positioning projection 72 is in contact with the second positioning portion 62; the release ring 8 is movably arranged in the outer sleeve 5; the end of the release ring 8 facing the shield 7 is able to disengage the first detent projection 71 from the first detent 53 by pushing the shield 7 away from the pushing end 73 of the needle tip 102 of the pre-filled syringe 2; the end of the release ring 8 facing away from the boot 7 is a top raised ring 81 for locating contact with the syringe flange 101 of the pre-filled syringe 2; one end of the elastic component 9 is abutted against the top raised ring 81, and the other end of the elastic component 9 is abutted against the protective cover 7.

The embodiment of the utility model provides a safety device can run through release ring 8, elastomeric element 9 and protection casing 7 in proper order with syringe body 10 of prefilling syringe 2 to syringe body 10 sets up in outer sleeve 5. The connection of the body sleeve 6 and the outer sleeve 5 limits the shield 7 from sliding out of the end of the outer sleeve 5 remote from the release ring 8, the resilient fingers 51 are positioned against the outer side of the syringe flange 101 of the prefilled syringe 2, limiting the movement of the syringe flange 101 in a direction away from the release ring 8, and completing the assembly of the safety shield apparatus with the prefilled syringe 2. During an injection procedure, plunger 4 of pre-filled syringe 2 is depressed (the depression force being the injection pressure) and syringe barrel 10 is immobilized relative to outer sleeve 5 due to the positioning of syringe flange 101 in contact with top raised ring 81 of release ring 8 such that plunger 4 moves plunger 12 of pre-filled syringe 2 within syringe barrel 10 and depresses the medicament within syringe barrel 10 toward tip 102 of pre-filled syringe 2, causing the medicament within syringe barrel 10 to be injected into the patient. After the injection is completed, the plunger 12 is in positioning contact with the end of the syringe body 10 (the end of the syringe body 10 near the needle tip 102), and when the plunger 12 cannot advance further relative to the needle tip 102, indicating that the medicament in the syringe body 10 has been completely expelled, the user will remove the needle tip 102 from the injection site. Then, the user only needs to withdraw the needle tip 102 and then increase the pressure on the push rod 4 (the pressure is greater than the injection pressure), so that the release ring 8 and the shield 7 approach each other against the elastic restoring force of the elastic member 9, that is, the syringe flange 101 pushes the release ring 8 to approach the shield 7, the release ring 8 pushes the pushing end 73 toward one end of the shield 7, so that the first positioning protrusion 71 is separated from the first positioning portion 53, and the shield 7 moves away from the release ring 8 under the elastic restoring force of the elastic member 9, so that the shield 7 covers the needle tip 102 of the prefilled syringe 2; and, the shield 7 is restricted from coming out of the outer sleeve 5 by the contact action of the second positioning projection 72 and the second positioning portion 62. With the above arrangement, the safety shield does not interfere with the injection operation of the prefilled syringe 2. The prefilled syringe 2 can be of a conventional syringe structure, without structural changes, and has high versatility. Through the arrangement, the safety protection device does not interfere with injection operation and avoids the operation of popping up the protective cover in advance. And, the assembling operation is facilitated.

It should be noted that the elastic restoring force of the elastic member 9 should be larger than the force (pressing force) pressing the plunger 4 during injection. The elastic restoring force of the elastic member 9 may depend on the material and structure of the elastic member 9, and the pressing force of the prefilled syringe 2 may depend on the size of the prefilled syringe 2 (e.g., the size of the needle hole of the needle tip 102 and the inner size of the syringe body 10), which will not be described in detail herein. It is only necessary that the release ring 8 be positioned relative to the outer sleeve 5 (shield 7) by the elastic restoring force of the elastic means 9 during injection. The operation of releasing the protective cover 7 can be conveniently completed by one hand.

To facilitate injection, the outer sleeve 5 has an outer flange 52 on its outer wall. That is, during operation (including injection and shield release), the operator holds the outer sleeve 5, and by positioning the outer flange 52 with the fingers, the outer sleeve 5 is prevented from sliding, and then pushes the push rod 4, thereby completing the operation.

Further, the outer sleeve 5 also has a window through its inner wall and its outer wall; the top protrusion ring 81 has an outward protrusion portion extending outward in the circumferential direction thereof, the outward protrusion portion extending into the window; in the state where the shield 7 covers the needle tip 102 of the prefilled syringe 2, the male part is in contact with the edge of the window near the shield 7. With the above arrangement, in a state where the shield 7 covers the needle tip 102 of the prefilled syringe 2, the situation where the release ring 8 is shaken in the outer sleeve 5 is effectively avoided.

The second positioning portion 62 is a hook, the protective cover 7 is further provided with a clamping step portion 74, and a step surface of the clamping step portion 74 faces the release ring 8; the snap fits with the step surface of the snap ledge 74 in a state where the shield 7 is not ejected from the outer sleeve 5. Through the arrangement, under the state that the outer sleeve 5 is not ejected out of the protective cover 7, the protective cover 7 receives the matching positioning effect of the clamping hook and the clamping convex edge 74 and the positioning effect of the first positioning bulge 71 and the first positioning part 53, and the stability of the protective cover 7 in the outer sleeve 5 is effectively improved.

Furthermore, the second positioning protrusion 72 has a positioning protrusion structure and a hook protrusion structure; in the state that the protective cover 7 covers the needle tip 102 of the prefilled syringe 2, the positioning protrusion structure contacts with the end surface of the second positioning portion 62 facing the release ring 8, and the hook protrusion structure is matched with the hook surface of the second positioning portion 62. With the above arrangement, the stability of fitting the shield 7 with the outer sleeve 5 in the state where the shield 7 is ejected out of the outer sleeve 5 is ensured.

Preferably, the body sleeve 6 is snap-connected with the outer sleeve 5. Other means of connecting the body sleeve 6 to the outer sleeve 5 are possible, such as a threaded connection or the like.

For convenient installation, the body sleeve 6 is provided with an outer sleeve connecting clamping hook 61 arranged towards the outer sleeve 5; the inner wall of the outer sleeve 5 is provided with a body sleeve clamping groove hole 54 matched with the outer sleeve connecting clamping hook 61. It will be appreciated that the outer sleeve attachment hooks 61 are hooked in the opposite direction to the second locating portions 62 (hooks).

For the comfort of use, the end of the body sleeve 6 far away from the protective cover 7 is in a conical structure, and the small end of the body sleeve is far away from the protective cover 7.

In order to facilitate the processing of the parts, the elastic member 9 is a spring. Wherein the spring is sleeved outside the prefilled syringe 2 during installation. Of course, a member such as a rubber block may be provided as the elastic member 9, and only the requirement is satisfied.

The utility model also provides an injection device, including prefilling syringe 2 and safety device 3, safety device 3 is as above-mentioned any kind of safety device. Since the safety shield has the above technical effects, an injection device having the safety shield should also have the same technical effects.

It is emphasized that the safety shield apparatus described above can be adapted to common syringe configurations without further modification to the prefilled syringe 2, requiring only adjustment of the size of the safety shield apparatus to the actual size of the prefilled syringe 2, and is highly versatile. A needle cap 11 may also be provided on the prefilled syringe 2.

In this embodiment, the prefilled syringe 2 may be adapted for prefilling 1.0 or 0.5ml vials. The utility model discloses prefill syringe 2, the preferred 1/2 inches of size of syringe body 10 and the length size of prefilling are the elongated to in order to be wrapped by safety device. The pre-filled syringe 2 needs to be provided with a push rod 4 before the safety shield can be activated effectively.

In this embodiment, the needle tip 102 of the prefilled syringe 2 is sheathed with the needle housing 12, and the needle housing 12 is removed from the prefilled syringe 2 prior to an injection procedure. Syringe flange 101 is preferably disposed at the end of syringe barrel 10.

The forward end refers to the end near the needle tip 102 and the distal end is the end away from the needle tip 102.

It is right above that the utility model provides a safety device has carried out detailed introduction. The principles and embodiments of the present invention have been explained herein using specific examples, and the above descriptions of the embodiments are only used to help understand the method and its core ideas of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.

Claims

1. A safety shield apparatus, comprising:

the syringe comprises an outer sleeve (5), wherein the inner wall of the outer sleeve (5) is provided with a first positioning part (53), and the outer edge of the push rod pressing end of the outer sleeve (5) is provided with an elastic claw (51) for positioning and matching with the outer side surface of a syringe flange (101) of a prefilled syringe (2);

the body sleeve (6) is arranged at the ejection end of the protective cover of the outer sleeve (5), and the body sleeve (6) is provided with a second positioning part (62);

the protective cover (7) is movably arranged in the outer sleeve (5), and a first positioning protrusion (71) which can be matched with the first positioning part (53) in a positioning mode and a second positioning protrusion (72) which limits the protective cover (7) from falling out of the outer sleeve (5) are arranged on the protective cover (7); in a state that the protective cover (7) covers the needle tip (102) of the prefilled syringe (2), the first positioning protrusion (71) is separated from the first positioning part (53) and the second positioning protrusion (72) is contacted with the second positioning part (62);

a release ring (8), the release ring (8) being movably arranged within the outer sleeve (5); the release ring (8) being able to disengage the first detent projection (71) from the first detent (53) by pushing the shield (7) away from a pushing end (73) of the needle tip (102) of the pre-filled syringe (2) towards an end of the shield (7); the end of the release ring (8) facing away from the boot (7) is a top raised ring (81) for positioning contact with a syringe flange (101) of a pre-filled syringe (2);

one end of the elastic component (9) is abutted to the top protruding ring (81), and the other end of the elastic component (9) is abutted to the protective cover (7).

2. A safety shield according to claim 1, wherein the outer sleeve (5) has an external flange (52) on its outer wall.

3. A safety shield according to claim 1, wherein the outer sleeve (5) further has a window through its inner wall and its outer wall;

the top protrusion ring (81) has an outward protruding portion extending outward in the circumferential direction thereof, the outward protruding portion protruding into the window; the bulge is in contact with an edge of the window close to the shield (7) in a state where the shield (7) covers the needle tip (102) of the pre-filled syringe (2).

4. The safety protection device according to claim 1, wherein the second positioning portion (62) is a snap, the protective cover (7) further has a snap step portion (74), and a step surface of the snap step portion (74) faces the release ring (8);

the protection casing (7) does not pop out under the state of outer sleeve (5), the trip with the step face cooperation of joint protruding edge (74).

5. A safety shield apparatus according to claim 4, wherein the second positioning projection (72) has a positioning projection configuration and a snap projection configuration;

and under the state that the protective cover (7) covers the needle tip (102) of the prefilled syringe (2), the positioning bulge structure is in contact with the end face, facing the release ring (8), of the second positioning part (62), and the clamping hook bulge structure is matched with the clamping hook face of the second positioning part (62).

6. Safety shield device according to claim 1, characterized in that the body sleeve (6) is snap-connected with the outer sleeve (5).

7. A safety shield device according to claim 6, wherein the body sleeve (6) has an outer sleeve attachment catch (61) disposed towards the outer sleeve (5);

the inner wall of the outer sleeve (5) is provided with a body sleeve clamping groove hole (54) matched with the outer sleeve connecting clamping hook (61).

8. A safety shield according to claim 1, wherein the end of the body cover (6) remote from the shield (7) is of conical configuration, the smaller end of which is remote from the shield (7).

9. Safety shield arrangement according to any one of claims 1-8, characterized in that the resilient member (9) is a spring.

10. An injection device comprising a prefilled syringe (2) and a safety shield (3), wherein said safety shield (3) is a safety shield according to any one of claims 1 to 9.