Safety device for prefilled syringe and injection device

Abstract

The utility model discloses a safety device for a prefilled syringe and an injection device, and relates to the technical field of medical equipment, in order to solve the problem that an existing safety device is not high in safety, the safety device comprises an outer cylinder, a sliding groove extending in the axial direction of the outer cylinder is formed in the inner wall of the outer cylinder, and limiting holes are formed in the two ends of the sliding groove; the protective cover is arranged in the outer cylinder, a positioning pin is arranged at the end, movably connected with the outer cylinder, of the protective cover and matched with the limiting hole and the sliding groove, the outer cylinder is rotationally sleeved with the handle structure, a starting button used for enabling the positioning pin to be separated from the limiting hole is arranged on the handle structure, and the elastic piece is arranged between the outer cylinder and the protective cover. The elastic piece is used for providing pre-tightening force enabling the protective cover to move in the direction extending out of the outer cylinder, triggering is conducted in an active rotating and pressing mode, so that the safety device before triggering is not prone to triggering failure caused by collision, and meanwhile through cooperation of the limiting hole and the positioning pin, it can be guaranteed that the safety device after triggering is locked and not prone to failure.

Description

TECHNICAL FIELD

[0001] The utility model relates to medical equipment technical field more specifically, relate to a kind of safety device and injection device for pre-filled syringe. BACKGROUND

[0002] As a new type of medicine packaging form, pre-filled syringe is used to store medicine in advance in the syringe by pharmaceutical factory. When used in clinic, it can be directly injected to avoid the secondary pollution caused by traditional medicine extraction and the problem of incomplete medicine waste caused by extraction of vial or ampoule. With the development of medicine and beauty industry, pre-filled syringe has been widely used due to its obvious advantages. At present, pre-filled syringe is divided into two categories: needle product and needle-free product. The exposed needle tip of needle product can cause harm to the user or surrounding personnel, and even cause disease transmission.

[0003] The common safety device on the market is fixed by buckle at initial position, and is triggered by push type, that is, a larger force is applied to start the safety device when the push rod is pushed. The safety device can be triggered by a larger impact or accidental touch.

[0004] Therefore, how to solve the problem of low safety of the existing safety device is a problem to be solved by the technical personnel in the field. UTILITY MODEL CONTENT

[0005] Therefore, the utility model provides a safety device for pre-filled syringe, which is triggered by active rotation and pressing. The safety device before triggering is not easy to be triggered by impact. The safety device after triggering is locked by the cooperation of limiting hole and positioning pin, so that it is not easy to fail.

[0006] Another object of the utility model is to provide an injection device comprising the above-mentioned safety device for pre-filled syringe, which is safer.

[0007] To achieve the above object, the utility model provides the following technical scheme:

[0008] A safety device for pre-filled syringe comprises:

[0009] An outer cylinder is provided with a sliding groove extending along the axial direction of the outer cylinder. The two ends of the sliding groove are provided with limiting holes penetrating the inner wall and the outer wall of the outer cylinder.

[0010] A protective cover is arranged in the inner part of the outer cylinder. The end of the protective cover connected with the outer cylinder is provided with a positioning pin. The positioning pin is arranged in cooperation with the limiting hole and the sliding groove.

[0011] A handle structure is rotatably arranged outside the outer cylinder. The handle structure is provided with a starting button for making the positioning pin separate from the limiting hole.

[0012] An elastic member is arranged between the outer cylinder and the protective cover, and the elastic member is used to provide a pre-tightening force for moving the protective cover in a direction of extending out of the outer cylinder.

[0013] Preferably, one end of the outer cylinder is provided with a plurality of clamping hooks, the plurality of clamping hooks are uniformly arranged on the outer periphery of the outer cylinder, the inner edge of the clamping hook is provided with a slope for guiding the installation of the pre-filled syringe, the flange of the pre-filled syringe is clamped between the end surface of the clamping hook and the outer cylinder, and the end of the pre-filled syringe away from the clamping hook is sleeved in the protective cover.

[0014] Preferably, the handle structure comprises a sleeve sleeved on the outer cylinder, the inner wall of the sleeve is provided with a positioning ring, the positioning ring is arranged at both ends of the start button, and the outer cylinder is provided with a positioning groove matched with the positioning ring.

[0015] Preferably, the positioning ring is provided with a circular-arc protrusion protruding inward along the radial direction of the sleeve, and the positioning groove is provided with a limiting groove matched with the circular-arc protrusion.

[0016] Preferably, the outer periphery of the sleeve is uniformly provided with two power assisting structures and two start buttons, and the power assisting structures and the start buttons are arranged alternately.

[0017] Preferably, the inner part of the end of the outer cylinder close to the clamping hook is provided with a stop portion, and the stop portion is provided with a mounting groove for mounting the elastic member.

[0018] Preferably, the protective cover comprises a needle protection inner cylinder, the outer periphery of one end of the needle protection inner cylinder is provided with a protruding ring, the outer edge of the protruding ring is provided with an elastic arm, and the end part of the elastic arm is provided with a positioning pin.

[0019] Preferably, the start button comprises a button body, one end of the button body is connected with the sleeve, the inner wall of the other end of the button body is provided with a protrusion matched with the limiting hole, in the initial state, the protrusion is separated from the limiting hole, and the button body and the sleeve are integrally injection molded.

[0020] Preferably, the elastic member is a spring.

[0021] An injection device comprising a pre-filled syringe and a safety device, the safety device being a safety device for a pre-filled syringe according to any one of the preceding claims.

[0022] The safety device for pre-filled syringe provided by the utility model comprises an outer cylinder, a protective cover, a handle structure and an elastic piece, specifically, the inner wall of the outer cylinder is provided with a sliding groove extending along the axial direction of the outer cylinder, the two ends of the sliding groove are provided with limiting holes penetrating the inner wall and the outer wall of the outer cylinder, the protective cover is arranged inside the outer cylinder, one end of the protective cover movably connected with the outer cylinder is provided with a positioning pin, the positioning pin is arranged in cooperation with the limiting holes and the sliding groove, the positioning pin and the limiting holes are clamped, the connection and fixation of the outer cylinder and the protective cover are realized, the positioning pin can be moved along the sliding groove by setting the sliding groove, the guiding effect is achieved, the positioning pin can be clamped in the limiting hole by moving up and down, and the displacement or deviation of the positioning pin will not occur.

[0023] The handle structure is rotatably sleeved outside the outer cylinder, the handle structure is provided with a starting button for making the positioning pin separate from the limiting hole, the starting button on the handle structure and the limiting hole of the outer cylinder are in the staggered state before and during the injection of the pre-filled syringe, the safety device cannot be started, even if the starting button is accidentally touched or the safety device is collided, the safety device will not be triggered, the injection can be completed with the help of the handle structure, the elastic piece is arranged between the outer cylinder and the protective cover and is used for providing the pre-tightening force for moving the protective cover in the direction of extending out of the outer cylinder, after the injection is completed, the handle structure is rotated, the starting button is arranged at the position of the limiting hole, the starting button is pressed, the inward compression force is applied to the positioning pin through the starting button, the positioning pin is separated from the limiting hole, the protective cover moves downward along the sliding groove under the pre-tightening force of the elastic piece, when the positioning pin reaches another limiting hole, the positioning pin is clamped in the limiting hole under the self elastic force, the needle of the pre-filled syringe is completely arranged inside the protective cover, and the harm to the user or other people is prevented.

[0024] The safety device for pre-filled syringe arranged in the above manner is triggered by the active rotation and pressing mode, the safety device before being triggered is not easy to be triggered and failed due to the impact, the safety device after being triggered can be locked and is not easy to fail, the safety device is safe and reliable, and the needle of the pre-filled syringe after the injection is completed will not harm the user and the surrounding people. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced, and obviously, the drawings in the following description are only the embodiments of the utility model, and other drawings can be obtained by the provided drawings without the creative labor for the ordinary skilled in the art.

[0026] Figure 1 The structure schematic diagram of the safety device for pre-filled syringe provided by the utility model is triggered.

[0027] Figure 2 A schematic diagram of the structure of the safety device for pre-filled syringes provided by this utility model when it is not triggered;

[0028] Figure 3 A cross-sectional view showing the triggering of the safety device for a pre-filled syringe provided by this utility model;

[0029] Figure 4 A cross-sectional view of the safety device for a pre-filled syringe provided by this utility model when it is not triggered;

[0030] Figure 5 This is a schematic diagram of the structure of the outer cylinder provided by this utility model;

[0031] Figure 6 This is a cross-sectional view of the outer cylinder provided by this utility model;

[0032] Figure 7 This is a schematic diagram of the handle structure provided by this utility model;

[0033] Figure 8 This is a cross-sectional view of the handle structure provided by this utility model;

[0034] Figure 9 for Figure 8 A diagram from another perspective;

[0035] Figure 10 This is a schematic diagram of the structure of the protective cover provided by this utility model;

[0036] Figure 11 This is a cross-sectional view of the protective cover provided by this utility model.

[0037] Figure label:

[0038] 1-Outer cylinder, 11-Slide groove, 12-Limiting hole, 13-Hook, 14-Positioning groove, 15-Mounting groove;

[0039] 2-Protective cover, 21-Positioning pin, 22-Inner tube of needle protection, 23-Protruding ring, 24-Elastic arm;

[0040] 3-Handle structure, 31-Start button, 32-Sleeve, 33-Positioning ring, 34-Assist structure, 35-Protrusion;

[0041] 4-Elastic element. Detailed Implementation

[0042] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described, and obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0043] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or integrally connected; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium, or can be the communication inside two elements. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0044] It should be noted that the orientation words such as "up" and "down" in the following are defined based on the drawings of the specification.

[0045] The pre-filled syringe refers to a new type of medicine packaging form, and the medicine is pre-filled in the syringe, which can be directly used for clinical injection; the safety device refers to a needle tip protection device, which triggers the safety device to cover the needle tip after the injection of the syringe, so as to prevent the exposed needle tip from causing harm to people.

[0046] The core of the present application is to provide a safety device for a pre-filled syringe, which triggers by active rotation and pressing, so that the safety device before triggering is not easy to trigger failure due to impact; at the same time, through the cooperation of the limiting hole 12 and the positioning pin 21, the safety device after triggering is locked and is not easy to fail, which is more safe and reliable. Another core of the present application is to provide an injection device comprising the safety device for the pre-filled syringe, which is safer.

[0047] Please refer to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 6 , a safety device for a pre-filled syringe comprises an outer cylinder 1, a protective cover 2, a handle structure 3 and an elastic member 4.

[0048] Specifically, the inner wall of the outer cylinder 1 is provided with a sliding groove 11 extending along the axial direction of the outer cylinder 1, both ends of the sliding groove 11 are provided with a limiting hole 12 penetrating through the inner wall and the outer wall of the outer cylinder 1, the protective cover 2 is arranged in the inner part of the outer cylinder 1, one end of the protective cover 2 movably connected with the outer cylinder 1 is provided with a positioning pin 21, the positioning pin 21 is arranged in cooperation with the limiting hole 12 and the sliding groove 11, the positioning pin 21 and the limiting hole 12 are clamped to realize the connection and fixation of the outer cylinder 1 and the protective cover 2, the positioning pin 21 can move along the sliding groove 11 to play a guiding role, so that the positioning pin 21 can be clamped in the limiting hole 12 by moving up and down, and displacement or deviation will not occur.

[0049] The handle structure 3 is rotatably sleeved on the outside of the outer cylinder 1, the handle structure 3 is provided with a starting button 31 for making the positioning pin 21 disengage from the limiting hole 12, before and during the injection of the pre-filled syringe, the starting button 31 on the handle structure 3 and the limiting hole 12 of the outer cylinder 1 are in a staggered state to play a safety role, so that the safety device cannot be started, even if the starting button 31 is accidentally touched or is subjected to a collision, the safety device will not be triggered, and the injection can be completed with the assistance of the handle structure 3 at this time, the elastic member 4 is arranged between the outer cylinder 1 and the protective cover 2 and is used to provide a pre-tightening force for moving the protective cover 2 in the direction of extending out of the outer cylinder 1, after the injection is completed, the handle structure 3 is rotated to make the starting button 31 be at the position of the limiting hole 12, at this time, the starting button 31 is pressed to apply an inward compression force to the positioning pin 21 to make the positioning pin 21 disengage from the limiting hole 12, at this time, the protective cover 2 moves the positioning pin 21 along the sliding groove 11 to the injection end under the pre-tightening force of the elastic member 4, when the positioning pin 21 reaches the limiting hole 12 close to the injection end, the positioning pin 21 is clamped into the limiting hole 12 under the self elastic force, at this time, the needle of the pre-filled syringe is completely in the inner part of the protective cover 2 to prevent harm to the user or other people.

[0050] The sliding groove 11 is arranged to limit the sliding track of the protective cover 2, the limiting hole 12 is arranged at both ends of the sliding groove 11 to fix the protective cover 2, the position of the limiting hole 12 is the limit position of the sliding of the protective cover 2, and the positioning pin 21 of the protective cover 2 cooperates with the limiting hole 12 and the sliding groove 11 to complete the movement stroke.

[0051] The safety device for the pre-filled syringe arranged in the above manner is triggered in a way of active rotation and pressing, so that the safety device before triggering is not easy to be triggered to fail due to impact, and the safety device after triggering can be locked to be not easy to fail through the cooperation of the limiting hole 12 and the positioning pin 21, which is safe and reliable and can ensure that the needle of the pre-filled syringe after the injection is completed will not harm the user and the surrounding people.

[0052] Please refer to Figure 3 , Figure 4 ,Figure 5 and Figure 6 One end of the outer cylinder 1 is provided with several hooks 13. Several hooks 13 are evenly distributed on the outer periphery of the outer cylinder 1. The inner edge of the hooks 13 is provided with an inclined surface for guiding the installation of the pre-filled syringe. The flange of the pre-filled syringe is engaged between the hooks 13 and the end face of the outer cylinder 1. The end of the pre-filled syringe away from the hooks 13 is fitted inside the protective cover 2.

[0053] It should be noted that the top of the outer cylinder 1 is provided with a hook 13, which is used to engage and fix the flange of the pre-filled syringe, so as to achieve a stable connection between the outer cylinder 1 and the pre-filled syringe. At this time, the pre-filled syringe is completely covered by the safety device. The end of the pre-filled syringe near the hook 13 is covered inside the outer cylinder 1, and the end of the pre-filled syringe away from the hook 13, that is, the end of the pre-filled syringe near its own needle, is covered inside the protective cover 2.

[0054] In this embodiment, the top surface of the hook 13 is set as an inclined surface with a slope, and the inclined surfaces of all hooks 13 are on the same conical surface to facilitate the quick and accurate installation of the pre-filled syringe.

[0055] The outer cylinder 1 and the hook 13 are an integral structure, and the outer cylinder 1 and the hook 13 are plastic parts that are injection molded in one piece, thus providing flexible space for installing the pre-filled syringe.

[0056] Please refer to Figure 5 , Figure 6 , Figure 7 and Figure 8 The handle structure 3 includes a sleeve 32 fitted onto the outer cylinder 1. The inner wall of the sleeve 32 is provided with a positioning ring 33. The positioning ring 33 is located at both ends of the start button 31. The outer cylinder 1 is provided with a positioning groove 14 that cooperates with the positioning ring 33.

[0057] It is understood that two positioning rings 33 are provided on the inner circumference of the sleeve 32. The positioning rings 33 protrude from the inner wall of the sleeve 32. The cross section of the positioning rings 33 along the axial direction of the sleeve 32 is semi-circular. The sleeve 32 is installed on the outside of the outer cylinder 1. The positioning rings 33 of the sleeve 32 are engaged with the positioning grooves 14 of the outer cylinder 1 to achieve effective connection between the handle structure 3 and the outer cylinder 1, so that the handle structure 3 can rotate outside the outer cylinder 1, and realize the rotational connection between the handle structure 3 and the outer cylinder 1.

[0058] When the injection is performed, the starting button 31 on the handle structure 3 is misaligned with the limiting hole 12 on the outer cylinder 1, so as to play a safety role, and the safety device cannot be started even if the starting button 31 is accidentally pressed or the safety device is impacted. At this time, the positioning pin 21 of the protective cover 2 is clamped with the limiting hole 12 close to the one end of the hook 13, so that the protective cover 2 is retracted in the outer cylinder 1, and the position of the protective cover 2 and the outer cylinder 1 is fixed, so that the needle of the pre-filled syringe is not affected by the protective cover 2, and the injection can be completed with the assistance of the handle structure 3. When the injection is completed, the handle structure 3 is rotated, the starting button 31 on the handle structure 3 is aligned with the limiting hole 12 on the outer cylinder 1, the starting button 31 is pressed, the positioning pin 21 of the protective cover 2 is separated from the limiting hole 12 close to the one end of the hook 13, the protective cover 2 slides along the sliding groove 11 away from the one end of the hook 13 under the action of the elastic member 4, until the positioning pin 21 of the protective cover 2 is clamped with the limiting hole 12 away from the one end of the hook 13, so as to fix the position of the protective cover 2 and the outer cylinder 1, and the protective cover 2 is extended from the outer cylinder 1 to protect the needle of the pre-filled syringe, so as to avoid causing harm to the user or others.

[0059] Further, the positioning ring 33 is provided with a circular arc protrusion protruding inward along the radial direction of the sleeve 32, and the positioning groove 14 is provided with a limiting groove matched with the circular arc protrusion.

[0060] It should be noted that the circular arc protrusion is additionally arranged on the positioning ring 33, and the limiting groove is additionally arranged on the positioning groove 14. The handle structure 3 and the outer cylinder 1 are connected through the cooperation of the positioning ring 33 and the positioning groove 14, and the handle structure 3 and the outer cylinder 1 are doubly positioned through the cooperation of the circular arc protrusion and the limiting groove, so as to avoid accidental rotation of the handle structure 3, resulting in that the starting button 31 corresponds to the limiting hole 12, and the safety device is triggered.

[0061] In an embodiment, two circular arc protrusions are arranged on the positioning ring 33, and two limiting grooves are arranged on the positioning groove 14. One of the circular arc protrusions is matched with the limiting groove, and is used for limiting the starting button 31 and the limiting hole 12, so that they are misaligned and cannot be rotated due to accidental touch. The other circular arc protrusion is matched with the limiting groove, and is used for limiting the starting button 31 and the limiting hole 12, so that they are aligned and cannot be rotated due to accidental touch. In actual application, this is not limited as long as the above technical effects can be achieved.

[0062] In the above embodiment, the outer periphery of the sleeve 32 is uniformly provided with two power assisting structures 34 and two starting buttons 31. The power assisting structure 34 and the starting button 31 are cross arranged, and the two starting buttons 31 are symmetrically placed.

[0063] It can be understood that the outer periphery of the sleeve 32 is uniformly provided with two power assisting structures 34, which facilitate the user to exert force when injecting, and the operator holds the power assisting structure 34 during the operation process (including the injection process and the process of releasing the protective cover 2), and the injection operation is completed by pushing the push rod of the pre-filled syringe.

[0064] On the basis of the above embodiment, the inner part of the outer cylinder 1 near one end of the clamping hook 13 is provided with a stop part, and the stop part is provided with a mounting groove 15 for mounting the elastic member 4.

[0065] It should be noted that the mounting groove 15 is provided for placing the elastic member 4, so that the mounting groove 15 limits the axial position of the elastic member 4.

[0066] Please refer to Figure 10 and Figure 11 The protective cover 2 comprises a needle guard inner cylinder 22, and the outer periphery of one end of the needle guard inner cylinder 22 is provided with a convex ring 23, the outer edge of the convex ring 23 is provided with an elastic arm 24, and the end of the elastic arm 24 is provided with a positioning pin 21.

[0067] It can be understood that the needle guard inner cylinder 22, the convex ring 23 and the elastic arm 24 form a groove for limiting the elastic member 4, one end of the elastic member 4 is mounted in the mounting groove 15, and the other end is mounted in the groove, and the two ends of the elastic member 4 are limited by the mounting groove 15 and the groove, which can prevent the elastic member 4 from shaking during use.

[0068] Please refer to Figure 7 , Figure 8 and Figure 9 The start button 31 comprises a button body, one end of the button body is connected with the sleeve 32, and the inner wall of the other end of the button body is provided with a protrusion 35 matched with the limiting hole 12, and in the initial state, the protrusion 35 is separated from the limiting hole 12, and the button body and the sleeve 32 are integrally injection molded.

[0069] It should be noted that because the button body and the sleeve 32 are integrally injection molded, the button body itself has the ability to rotate slightly, when no external force is applied to the button body, the protrusion 35 is in a separated state from the limiting hole 12, and when an external force is applied to move the button body towards the sleeve 32, the protrusion 35 can be clamped into the limiting hole 12, so that the positioning pin 21 in the limiting hole 12 is separated from the limiting hole 12.

[0070] When the injection is in process, the starting button 31 on the handle structure 3 is out of alignment with the limiting hole 12 on the outer cylinder 1, so as to play a role of safety, and the safety device cannot be started even if the starting button 31 is accidentally touched or is subjected to a collision. At this time, the positioning pin 21 of the protective cover 2 is clamped in the limiting hole 12 of the outer cylinder 1 under the elastic force of the positioning pin 21, and the protective cover 2 is clamped in the limiting hole 12 under the elastic force of the spring between the protective cover 2 and the outer cylinder 1. The pre-filled syringe is inserted into the outer cylinder 1 along the inclined surface from the position of the clamping hook 13 and is fixed under the action of the clamping hook 13.

[0071] In the above case, the elastic member 4 is a spring.

[0072] It can be understood that, in order to facilitate the processing of parts, the elastic member 4 is provided as a spring. In actual application, a rubber block or the like can also be provided as the elastic member 4, and this is not limited, as long as the above technical effects can be achieved.

[0073] In the injection process, the push rod of the pre-filled syringe is extruded (the extrusion force is the injection pressure), and the clamping hook 13 on the outer cylinder 1 is positioned, so that the syringe bottle body does not move relative to the outer cylinder 1, the push rod drives the push plug of the pre-filled syringe to move in the syringe bottle body and extrude the medicament in the syringe bottle body to the needle tip of the pre-filled syringe, so that the medicament in the syringe bottle body is injected into the patient's body.

[0074] Initial state: the handle structure 3 is sleeved on the outer cylinder 1, and the handle structure 3 is fixed on the outer cylinder 1 under the cooperation of the positioning ring 33 and the positioning groove 14. At this time, the handle structure 3 can rotate on the outer cylinder 1, the starting button 31 is out of alignment with the limiting hole 12, so as to play a role of safety, and the safety device cannot be started even if the starting button 31 is accidentally touched or is subjected to a collision. Before use, the positioning pin 21 of the protective cover 2 is located at the position of the limiting hole 12 of the outer cylinder 1, the protective cover 2 is clamped in the limiting hole 12 under the elastic force of the positioning pin 21, and the spring between the protective cover 2 and the outer cylinder 1 is in a compressed state. The pre-filled syringe is inserted into the outer cylinder 1 along the inclined surface from the position of the clamping hook 13 and is fixed under the action of the clamping hook 13.

[0075] Standby state: At this time, the starting button 31 is misaligned with the limiting hole 12 to play the role of insurance, so the safety device cannot be started, and at this time, the injection can be completed with the assistance of the power-assisted structure 34.

[0076] Use state: After the syringe is pulled out of the human body, the handle structure 3 is rotated, and the starting button 31 is positioned in the limiting hole 12. At this time, the two positioning pins 21 are pressed inward, and after the limiting hole 12 is separated, the positioning pins 21 are moved to the injection end along the sliding groove 11 under the action of the spring until the positioning pins 21 on the elastic arm 24 are clamped into the limiting hole 12 of the injection end. At this time, the needle of the syringe is completely inside the protective cover 2, and the protective cover 2 has a protective effect on the needle to prevent harm to the user or others.

[0077] Through the above setting, the safety device does not interfere with the injection operation and avoids the operation of the protective cover 2 being pulled out in advance, and the number of parts is small, the processing cost is low, the assembly is simple, and the operation is convenient.

[0078] In summary, the safety device for the pre-filled syringe provided by the utility model adopts the active triggering mode of the starting button 31 to complete the starting of the safety device, the triggering is simple and controllable, the handle structure 3 where the starting button 31 is located is arranged in a rotatable mode, so that the position of the positioning pin 21 is protected by the outer ring of the handle structure 3 at the time of non-use, at this time, the safety device cannot be triggered, and the anti-misoperation function is simply and effectively completed, so that the effectiveness and safety of the safety device are greatly improved.

[0079] In addition to the safety device for the pre-filled syringe disclosed in the above embodiments, the utility model also provides an injection device comprising the safety device for the pre-filled syringe, which comprises a pre-filled syringe and a safety device. The structure of other parts of the injection device is referred to the prior art, and will not be described here. Since the safety device has the above technical effects, the injection device with the safety device should also have the same technical effects. It should be emphasized that the safety device can be adapted to common pre-filled syringes without further improvement of the pre-filled syringes. Only the size of the safety device needs to be adjusted according to the actual size of the pre-filled syringe, and the universality is high. A needle cap can also be arranged on the pre-filled syringe.

[0080] It should be noted that in the present specification, the relationship terms such as first and second are only used to distinguish one entity from other entities, and do not necessarily require or imply any such actual relationship or order between the entities.

[0081] The embodiments in the present specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same and similar parts between the embodiments can be referred to each other.

[0082] The safety device for pre-filled syringe and injection device are described in detail above. The principles and implementation manners of the present application are described by applying specific examples in this paper, and the above description of the examples is only used to help understand the method and core idea of the present application. It should be pointed out that for ordinary skilled persons in the technical field, some improvements and modifications can be made to the present application without departing from the principles of the present application, and these improvements and modifications also fall within the protection scope of the present application.

Claims

1. A safety device for a pre-filled syringe, characterized in that, include: The outer cylinder (1) has an inner wall with a groove (11) extending along its own axis, and the two ends of the groove (11) have limiting holes (12) that penetrate the inner wall and the outer wall of the outer cylinder (1). A protective cover (2) is provided inside the outer cylinder (1). The protective cover (2) is movably connected to the outer cylinder (1) and a positioning pin (21) is provided at one end. The positioning pin (21) is configured to cooperate with the limiting hole (12) and the sliding groove (11). The handle structure (3) is rotatably sleeved on the outside of the outer cylinder (1), and the handle structure (3) is provided with a start button (31) for disengaging the positioning pin (21) from the limiting hole (12). An elastic element (4) is disposed between the outer cylinder (1) and the protective cover (2), and the elastic element (4) is used to provide a preload force to move the protective cover (2) in the direction extending out of the outer cylinder (1).

2. The safety device for a pre-filled syringe according to claim 1, characterized in that, One end of the outer cylinder (1) is provided with several hooks (13), and the hooks (13) are evenly distributed on the outer periphery of the outer cylinder (1). The inner edge of the hooks (13) is provided with an inclined surface for guiding the installation of the pre-filled syringe. The flange of the pre-filled syringe is engaged between the hooks (13) and the end face of the outer cylinder. The end of the pre-filled syringe away from the hooks (13) is sleeved inside the protective cover (2).

3. The safety device for a pre-filled syringe according to claim 1, characterized in that, The handle structure (3) includes a sleeve (32) fitted onto the outer cylinder (1), and the inner wall of the sleeve (32) is provided with a positioning ring (33). The positioning ring (33) is located at both ends of the start button (31), and the outer cylinder (1) is provided with a positioning groove (14) that cooperates with the positioning ring (33).

4. The safety device for a pre-filled syringe according to claim 3, characterized in that, The positioning ring (33) is provided with an arc protrusion that protrudes radially inward along the sleeve (32), and the positioning groove (14) is provided with a limiting groove that cooperates with the arc protrusion.

5. The safety device for a pre-filled syringe according to claim 3, characterized in that, The sleeve (32) is evenly provided with two assist structures (34) and two start buttons (31) on its outer periphery, and the assist structures (34) and start buttons (31) are arranged crosswise.

6. The safety device for a pre-filled syringe according to claim 2, characterized in that, The outer cylinder (1) has a stop part inside one end near the hook (13), and the stop part has a mounting groove (15) for installing the elastic element (4).

7. The safety device for a pre-filled syringe according to claim 1, characterized in that, The protective cover (2) includes a needle inner tube (22), a protruding ring (23) is provided on the outer periphery of one end of the needle inner tube (22), an elastic arm (24) is provided on the outer edge of the protruding ring (23), and the positioning pin (21) is provided at the end of the elastic arm (24).

8. The safety device for a pre-filled syringe according to claim 3, characterized in that, The start button (31) includes a button body, one end of which is connected to the sleeve (32), and the inner wall of the other end of the button body is provided with a protrusion (35) that cooperates with the limiting hole (12). In the initial state, the protrusion (35) is separated from the limiting hole (12), and the button body and the sleeve (32) are integrally injection molded.

9. The safety device for a pre-filled syringe according to any one of claims 1-8, characterized in that, The elastic element (4) is a spring.

10. An injection device comprising a pre-filled syringe and a safety device, characterized in that, The safety device is the safety device for a pre-filled syringe as described in any one of claims 1-9.

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