A needle hiding and locking structure and a syringe

Abstract

The present invention provides a needle concealment and locking structure and a syringe, belonging to the technical field of medical devices. The needle concealment and locking structure of the present invention includes a concealment head, an injection ring and a locking member; the concealment head abuts against the injection ring through a connecting portion, a stop portion and a through hole are arranged inside the injection ring, and a locking piece is arranged on the locking member; the locking member is configured to be rotatable. When the locking piece is rotated to the axial direction of the stop portion, the injection ring is restricted from axial movement by the locking member, so as to lock the concealment head before injection; when the locking piece is rotated to the axial direction of the through hole, the locking piece can move axially through the through hole of the injection ring, thereby realizing the unlocking of the locked state of the concealment head. The injection steps are greatly simplified, the convenience of patient operation is improved, the needle is concealed throughout the process, and the needle automatically hides and locks in the hidden state after being removed from the injection site, avoiding the risk of accidental contact with the needle by the patient after use and cross-infection caused by accidental contact with the needle during the disposal of the device.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly to a needle hiding and locking structure and a syringe. Background Art

[0002] Currently, at home and abroad, the syringes commonly used in medical treatment require professional medical staff to manually and continuously press the syringe push rod for injection, and the medical staff need to draw a certain amount of medicine into the syringe in advance; for the use environment and conditions of some medicines, this method is time-consuming and laborious, and cannot quickly and simply inject patients, and patients cannot carry it alone for self-help and self-treatment; thus, it brings a lot of inconvenience to patients and users.

[0003] Therefore, some auto-injectors have emerged in the market. These auto-injectors can simplify the injection operation, meet the needs of patients for self-injection, and do not require professional doctors to operate and guide beside, and have the characteristics of being portable, fast, and simple, and well solve the injection use needs of some medicines and the emergency use needs of patients. However, the existing auto-injectors have a relatively complex structure and require multiple steps of operation before injection. The hiding head is movable, and the hiding head will move backward during and after injection, and the needle will be exposed, which has an impact on the psychology of patients and may cause harm to patients due to misoperation or accidental touch, and cannot meet the use requirements. Summary of the Invention

[0004] To solve the technical problems existing in the prior art, the present invention provides a needle hiding and locking structure and a syringe. The present invention can achieve automatic injection with one-step operation after the safety lock is unlocked, greatly simplifies the injection steps, reduces the learning time of using the device, and improves the convenience of patient operation. The present invention can lock the hiding head when not in use, and also lock the hiding head after injection, realizing the hiding of the needle throughout the whole process of using the device, weakening the psychological impact of the needle on patients, increasing the effectiveness of needle protection, realizing the automatic hiding and locking of the hidden state of the needle after moving away from the injection site, and avoiding the risk of cross-infection caused by accidental touch of the needle after patient use and accidental touch of the needle during device disposal.

[0005] The present invention provides a needle hiding and locking structure, including a hiding head, an injection ring, and a locking member;

[0006] The hiding head abuts against the injection ring through a connecting portion. A stop portion and a through hole are provided inside the injection ring, and a locking piece is provided with a locking piece;

[0007] The locking member is configured to be rotatable. When the locking piece is rotated to the axial direction of the stop portion, the injection ring is restricted from axial movement by the locking member, realizing the locking of the hiding head before injection;

[0008] When the locking plate is rotated to the axial direction of the through hole, the locking plate can pass through the through hole of the injection ring to move axially, thereby unlocking the locked state of the hidden head.

[0009] Preferably, the injection ring limiting structure has a certain slope for limiting the movement of the injection ring when passing through the injection ring limiting structure.

[0010] Preferably, a locking sub-component is further included, and the locking component and the locking sub-component are provided with mutually cooperating snap-fitting structures to achieve synchronous rotation of the two.

[0011] Preferably, a locking piece limiting structure and a limiting space are provided on the locking sub-component, and a locking piece limiting structure is provided on the locking piece, and the locking sub-component limiting structure is arranged in the limiting space. When the locking piece rebounds with the injection ring, the locking sub-component limiting structure can be separated from the limiting space, and the end face of the locking sub-component limiting structure is abutted against the end face of the locking piece limiting structure, thereby realizing the locking state of the hidden head after the injection is completed.

[0012] Preferably, it also includes a safety lock cover; the safety lock cover is arranged at the other end opposite to the hidden head, and the safety lock cover and the locking sub-component are provided with mutually cooperating snap-fit ​​structures to achieve synchronous rotation of the two.

[0013] Preferably, it further comprises an axial elastic element, wherein the axial elastic element is arranged between the injection ring and the safety lock cover.

[0014] Preferably, the outer diameter of the injection ring limiting structure gradually increases from the end close to the hidden head to the end away from the hidden head, forming a slope, and a protrusion is formed at the bottom of the maximum outer diameter away from the hidden head. The injection ring limiting structure can be deformed when subjected to axial force, and the injection ring can be limited by the end face of the protrusion when passing through the injection ring limiting structure.

[0015] Preferably, the outer diameter of the locking sub-component limiting structure gradually increases from one end close to the hidden head to one end away from the hidden head, forming a slope, and forming an end face on the side away from the hidden head at the maximum outer diameter, and the locking sub-component limiting structure can be deformed when subjected to axial force; the inner diameter of the locking plate limiting structure gradually increases from one end close to the hidden head to one end away from the hidden head, forming a slope, and forming an end face on the side close to the hidden head at the minimum inner diameter.

[0016] Preferably, the connecting part includes a push rod module and a rotary elastic element; the rotary elastic element is connected to the push rod module; the injection ring is provided with limiting teeth, and the push rod module is provided with mating limiting teeth that can engage with the limiting teeth.

[0017] The present invention provides a syringe, including the above-mentioned needle hiding and locking structure.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] (1) Through the cooperation of the connecting part, injection ring, locking part, locking sub-part, and safety lock cover, the present invention realizes the hiding and protection of the needle before use of the syringe and the safety locking of the injection function, which can prevent the syringe from being accidentally triggered before use and resulting in scrapping; it avoids the accidental touch of the needle by the patient after use and causes harm, and at the same time protects the needle, preventing the risk of cross-infection caused by the accidental touch of the needle during the disposal of the device, and avoiding its contamination or damage during packaging, transportation and other links.

[0020] (2) Through the cooperation of the hiding head, injection ring and connecting part, the present invention realizes the one-step automatic injection of the device after the safety lock is unlocked; it simplifies the use process of the syringe. Only need to directly pierce the skin, and the automatic injection can be realized during the piercing process without other operation steps, reducing the learning requirements of the patient for the use of the injection device, greatly improving the operation convenience, and also reducing the requirements for the user, making it more universal. In some preferred ways, by adding an injection transmission part to realize the connection between the injection ring and the hiding head, the force transmission is realized, so that the space in the shell is better utilized, and the structure design of the hiding head is simpler. Through the cooperation of the hiding head, injection transmission part, injection ring and outer push rod, the one-step automatic injection of the device after the safety lock is unlocked is realized.

[0021] (3) Through the cooperation of the locking part, locking sub-part, axial elastic element, hiding head and injection transmission part, the present invention realizes the automatic hiding and locking of the hiding state of the needle after injection; after one use, the needle can be automatically hidden again and the hiding state can be locked, avoiding the harm of the needle to the user, and also avoiding the harm and cross-infection of the used needle to the handler during the waste treatment process.

[0022] (4) Through the cooperation of the hiding head and other related components, the present invention hides the needle throughout the entire use process. The user cannot see the needle from opening the device to discarding the automatic syringe device after use, weakening the psychological impact of the needle on the patient, improving the operation comfort of the patient, making the present invention applicable to a wider range of audience groups. At the same time, it also improves the effectiveness of needle protection, and reduces the accidental operation and secondary injury caused by fear. Description of the Drawings

[0023] Figure 1 Exploded view of a syringe according to an embodiment of the present invention;

[0024] Figure 2 Stereogram of the syringe in the unlocked state according to an embodiment of the present invention;

[0025] Figure 3 is Figure 2 Partial enlarged view at A in

[0026] Figure 4 Front view of the syringe in the unlocked state according to an embodiment of the present invention;

[0027] Figure 5 is Figure 4 Cross-sectional view taken along the line A-A in

[0028] Figure 6 Stereogram of the syringe in the unlocked state according to an embodiment of the present invention;

[0029] Figure 7 is Figure 6 Partial enlarged view at B in

[0030] Figure 8 Front view of the syringe in the unlocked state according to an embodiment of the present invention;

[0031] Figure 9 is Figure 8 Cross-sectional view taken along the line B-B in

[0032] Figure 10 Stereogram of the syringe according to an embodiment of the present invention (including the safety lock cover, excluding the injection device cover);

[0033] Figure 11 Stereogram of the injection ring according to an embodiment of the present invention;

[0034] Figure 12 Axonometric view of the rear housing in an embodiment of the present invention;

[0035] Figure 13 Stereogram of the locking member in an embodiment of the present invention;

[0036] Figure 14 Stereogram of the locking sub-member in an embodiment of the present invention;

[0037] Figure 15 Exploded view of the cooperation between the locking member and the locking sub-member in an embodiment of the present invention;

[0038] Figure 16 Stereogram of the positions of the locking member, the locking sub-member and the injection ring in the unlocked state in an embodiment of the present invention;

[0039] Figure 17 A perspective view of the positions of the locking member, locking accessory, and injection ring during injection after unlocking in an embodiment of the present invention.

[0040] In the figure: Figures 1 - 9 , it is a structural diagram of a syringe without an injection device cover and a safety lock cover; Figure 10 It is a structural diagram of a syringe with a safety lock cover and without an injection device cover;

[0041] 110 - inner push rod, 111 - groove, 112 - push block, 120 - outer push rod, 121 - protrusion, 122 - paired limiting teeth, 123 - tooth structure, 130 - rotating elastic element, 140 - injection ring, 141 - limiting teeth, 142 - stop portion, 143 - through hole, 144 - first blocking portion, 145 - second blocking portion, 150 - threaded buckle, 160 - locking member, 161 - locking piece limiting structure, 162 - locking piece, 163 - injection ring limiting structure, 164 - locking accessory limiting structure, 165 - locking accessory, 166 - limiting space, 170 - hidden head, 180 - injection transfer member, 190 - axial elastic element, 210 - medicine cartridge, 220 - safety lock cover, 230 - rear shell, 240 - front shell, 231 - groove, 232 - locking and unlocking icon, 310 - window. Detailed implementation manners

[0042] The following will make a detailed description of the specific implementation manners of the present invention in conjunction with the accompanying drawings.

[0043] The present invention provides a needle hidden locking structure, including a hidden head 170, an injection ring 140, and a locking member 160; the hidden head 170 abuts against the injection ring 140 through a connecting portion, a stop portion 142 and a through hole 143 are arranged inside the injection ring 140, and a locking piece 162 is arranged on the locking member 160; the connecting portion is a part for transmitting the movement of the hidden head 170 towards the injection ring 140;

[0044] The locking member 160 is configured to be rotatable. When the locking piece 162 is rotated to the axial direction of the stop portion 142, the injection ring 140 is restricted from axial movement by the locking member 160, realizing the locking of the hidden head 170 before injection;

[0045] When the locking piece 162 is rotated to the axial direction of the through hole 143, the locking piece 162 can axially move through the through hole 143 of the injection ring 140, thereby realizing the unlocking of the locked state of the hidden head 170. The injection ring 140 is used for locking and triggering before injection.

[0046] According to a specific embodiment of the present invention, an injection ring limiting structure 163 is provided on the locking plate 162 , and the injection ring limiting structure 163 has a certain slope for limiting the movement of the injection ring 140 when passing through the injection ring limiting structure 163 .

[0047] According to a specific embodiment of the present invention, a locking sub-component 165 is further included. The locking component 160 and the locking sub-component 165 are provided with mutually cooperating snap-fit ​​structures to achieve synchronous rotation of the two. The locking component 160 is used for locking before and after injection; the locking sub-component 165 is used for locking after injection.

[0048] According to a specific embodiment of the present invention, a locking piece limiting structure 161 and a limiting space 166 are provided on the locking sub-component 165, and a locking sub-component limiting structure 164 is provided on the locking piece 162. The locking sub-component limiting structure 164 is arranged in the limiting space 166. When the locking piece 160 rebounds with the injection ring 140, the locking sub-component limiting structure 164 can be separated from the limiting space 166, and the end face of the locking sub-component limiting structure 164 is abutted against the end face of the locking piece limiting structure 161, thereby realizing the locking state of the hidden head 170 after the injection is completed.

[0049] According to a specific embodiment of the present invention, a safety lock cover 220 is further included; the safety lock cover is arranged at the other end opposite to the hidden head 170, and the safety lock cover 220 and the locking sub-component 165 are provided with mutually cooperating snap-fit ​​structures to achieve synchronous rotation of the two.

[0050] According to a specific embodiment of the present invention, an axial elastic element 190 is further included, and the axial elastic element 190 is disposed between the injection ring 140 and the safety lock cover 220 .

[0051] In some specific embodiments of the present invention, the axial elastic element 190 extends along the axis and abuts against the safety lock cover 220. The axial elastic element 190 is a power source for the locking trigger after injection.

[0052] According to a specific embodiment of the present invention, the outer diameter of the injection ring limiting structure 163 gradually increases from one end close to the hidden head 170 to the end away from the hidden head 170, forming a slope, and a protrusion is formed at the bottom of the maximum outer diameter away from the hidden head. The injection ring limiting structure 163 can be deformed when subjected to axial force, and the injection ring 140 can be limited by the end face of the protrusion when passing through the injection ring limiting structure 163.

[0053] According to a specific embodiment of the present invention, the locking sub-component limiting structure 164 has an outer diameter that gradually increases from one end close to the concealed head 170 to the other end away from the concealed head 170, forming a slope, and a end face is formed on the side away from the concealed head at the maximum outer diameter. The locking sub-component limiting structure 164 can deform when subjected to an axial force; the locking piece limiting structure 161 has an inner diameter that gradually increases from one end close to the concealed head 170 to the other end away from the concealed head 170, forming a slope, and a end face is formed on the side close to the concealed head at the minimum inner diameter.

[0054] According to a specific embodiment of the present invention, the connecting portion includes a push rod module and a rotational elastic element; the rotational elastic element 130 is connected to the push rod module; the injection ring 140 is provided with limiting teeth 141, and the push rod module is provided with mating limiting teeth 122 that can engage with the limiting teeth 141. The rotational elastic element 130 is the power source for injection.

[0055] The present invention provides a syringe including the above-mentioned needle concealment and locking structure.

[0056] In certain specific embodiments of the present invention, the push rod module includes an inner push rod 110 and an outer push rod 120, and the outer push rod 120 is provided with mating limiting teeth 122 that can engage with the limiting teeth 141. The outer push rod 120 is used for locking before injection and transmitting injection power; the inner push rod 110 is used to push the rubber stopper in the pre-filled injection module for injection.

[0057] In certain specific embodiments of the present invention, it further includes an injection transmission member 180. The injection transmission member 180 is disposed between the concealed head 170 and the injection ring 140. The injection transmission member 180 is provided with a spring piece, and the mating limiting teeth 122 on the push rod module can contact the spring piece. The injection transmission member 180 is used for injection trigger transmission, locking after injection, and sound indication during injection.

[0058] In certain specific embodiments of the present invention, the injection transmission member 180, the rotational elastic element 130, the outer push rod 120, and the inner push rod 110 are arranged in sequence from outside to inside.

[0059] In certain specific embodiments of the present invention, a locking indication structure (not shown in the figure) is provided on the safety lock cover 220.

[0060] In certain specific embodiments of the present invention, locking and unlocking icons 232 are provided on the housing.

[0061] In certain specific embodiments of the present invention, it further includes a housing, the housing includes a front shell 240 and a rear shell 230, the safety lock cover 220 is connected to the rear shell 230, and the front shell 240 is arranged outside the push rod assembly.

[0062] In certain specific embodiments of the present invention, a medicine bin 210 and a concealed head 170 are arranged inside the front shell 240; the injection ring 140, the locking member 160, the locking sub-member 165 and the rotary elastic element 130 are arranged inside the rear shell 230.

[0063] In certain specific embodiments of the present invention, the medicine bin 210 is arranged inside the concealed head 170, and the medicine bin 210 is connected to the injection assembly.

[0064] In certain specific embodiments of the present invention, the safety lock cover 220 is connected to the rear shell 230.

[0065] In certain specific embodiments of the present invention, a locking and unlocking icon 232 is provided on the rear shell 230, and there is also a groove 231 corresponding to the locking and unlocking icon 232 on the rear shell 230.

[0066] In certain specific embodiments of the present invention, a window 310 is arranged on the front shell 240.

[0067] In certain specific embodiments of the present invention, the inner push rod 110 includes a push block 112 and a push rod, and the push block 112 is arranged at the front end of the push rod.

[0068] In certain specific embodiments of the present invention, the inner push rod (110) is axially provided with a groove (111), a hollow part at one end of the outer push rod (120) is provided with a protrusion (121), and the protrusion (121) is arranged in cooperation with the groove (111) to realize the synchronous rotation of the outer push rod (120) driving the inner push rod (110).

[0069] In certain specific embodiments of the present invention, the front shell 240 and the rear shell 230 are connected through the thread buckle 150, and the thread buckle 150 and the outer push rod 120 jointly act for injection power transmission.

[0070] In a specific embodiment of the present invention, such as Figure 1As shown in the figure, the syringe of the present invention includes a medicine chamber 210, a front shell 240, a concealed head 170, an inner push rod 110, a rear shell 230, an injection transfer member 180, a rotary elastic element 130, an outer push rod 120, a threaded buckle 150, an injection ring 140, a locking member 160, a locking sub-member 165, an axial elastic element 190, and a safety lock cover 220. The medicine chamber 210, the concealed head 170, the inner push rod 110, the outer push rod 120, the locking member 160, the locking sub-member 165, and the axial elastic element 190 are disposed within the front shell 240 and the rear shell 230;

[0071] The injection ring 140 cooperates with the locking member 160 and the locking sub-member 165 to limit the movement of the injection ring 140 and the concealed head 170; the injection transfer member 180 is disposed between the concealed head 170 and the injection ring 140, and a spring piece is provided on the injection transfer member 180.

[0072] In a specific embodiment of the present invention, as Figure 2 shown is a perspective view of the syringe of the present invention in an unlocked state. At this time, the indicating structure on the safety lock cover 220 points to the locking and unlocking icon 232; in this state, the user cannot use the device for injection.

[0073] Specifically, in combination with Figure 11 shown, the top of the injection ring 140 is alternately provided with a stop portion 142 and a through hole 143. A first blocking portion 144 is provided at the bottom of the injection ring 140 corresponding to the through hole 143, and a second blocking portion 145 is provided at the top of the injection ring 140 corresponding to the through hole 143. The radius of the first blocking portion 144 is smaller than the radius of the second blocking portion 145. The main body portion of the injection ring 140 is empty at the connection portion corresponding to the through hole 143 and the first blocking portion 144, and is solid at the portion corresponding to the stop portion 142.

[0074] In a specific embodiment of the present invention, as Figures 2 - 5 、 Figure 16 shown is the syringe of the present invention before injection and in a state where the safety lock is not unlocked. In combination with Figure 15 , in this state, the locking piece limiting structure 161 on the locking member 160 cooperates with the stop portion 142 on the injection ring 140. The locking piece limiting structure 161 cannot pass through the stop portion 142 on the injection ring 140, thereby preventing the injection ring 140 from moving along the central axis of the syringe in the top direction. Thus, the movement of the injection transfer member 180 in the same direction is restricted, and the movement of the concealed head 170 in this direction is restricted by restricting the injection transfer member 180, ultimately resulting in the locking effect of the concealed head 170, and the user cannot perform the intended action using the automatic syringe device of the present invention.

[0075] Before injection, when the safety lock is in the unlocked state, the locking sub-component limiting structure 164 of the locking component 160 is always within the limiting space 166 of the locking sub-component 165, and an axial elastic element 190 is provided between the injection ring 140 and the safety lock cover 220.

[0076] In a specific embodiment of the present invention, as Figures 6 - 9 , Figure 17 shows the syringe of the present invention in the state where the safety lock is unlocked. Combining Figure 15 , at this time, the indicating structure on the safety lock cover 220 points to the unlocking icon; in this state, the user can perform the preset injection action of the present invention. In Figure 2 the state described above, after performing a preset unlocking action on the safety lock cover 220 (for example, rotating the safety lock cover), one end of the locking component 160 moves from the stop portion 142 of the injection ring 140 into the through hole 143 of the injection ring 140, so that the locking component 160 is in the unlocked state, and the syringe of the present invention is transformed into Figures 6 - 9 the unlocked state shown.

[0077] After performing a preset unlocking action on the safety lock cover 220 (for example, rotating the safety lock cover 220), the locking component 160 moves with the safety lock cover 220 and reaches Figures 6 - 9 the state shown. In this state, the locking piece limiting structure 161 on the locking component 160 no longer cooperates with the stop portion 142 on the injection ring 140, but is transformed into cooperating with the through hole 143 on the injection ring 140, thereby releasing the constraint on the movement of the injection ring 140 in the central axial top direction in this embodiment. The injection transmission member 180 connected to the injection ring 140 and the concealed head 170 connected to the injection transmission member 180 are both released from the restriction and can move. In this state, the user can perform the expected injection action of the syringe of the present invention.

[0078] In this embodiment, when the syringe of the present invention is in the safety lock unlocked state, the concealed head 170 has moved to be flush with the end face of the front shell 240 under the action of the user (bringing the syringe device close to and pressing against the skin). Since the syringe is for inserting the needle into the body, synchronously when the concealed head 170 moves into the front shell 240, the needle in the front shell 240 also penetrates into the user's body, thereby ensuring that the patient never sees the needle during use. When the concealed head 170 moves, the injection transmission member 180 connected to it and the injection ring 140 connected to the injection transmission member 180 also move towards the end of the front shell 240. When the injection ring 140 moves towards the end of the front shell 240, the locking piece limiting structure 161 on the locking component 160 relatively passes through the through hole 143 of the injection ring 140, and the injection ring limiting structure 163 on the locking component 160 cooperates with the injection ring 140 to prevent the injection ring 140 from detaching from the locking component 160.

[0079] After the syringe is turned into the unlocked state, there is a slot 231 corresponding to the lock and unlock icons 232 on the rear case 230. The slot 231 ensures that the user can only move from the locked position to the unlocked position but not in the reverse direction during normal use. Regardless of whether the safety lock is in the locked or unlocked state, the vial loaded in the device can always be observed through the window 310 on the front case 240.

[0080] When the syringe is used in the safety lock unlocked state, as Figure 1 , 6 -9, Figure 17 shown, the limit teeth 141 on the injection ring 140 are no longer engaged with the mating limit teeth 122 on the outer push rod 120. The outer push rod 120 rotates under the action of the rotational elastic element 130, and then drives the inner push rod 110 to move forward through thread cooperation. While the outer push rod 120 rotates, the tooth structure 123 on the outer push rod 120 cooperates with the elastic piece on the injection transmission member 180 to generate a specific sound effect, which is used for reminder during use.

[0081] In a specific embodiment of the present invention, the inner push rod 110 includes a push rod and a push block 112. The push block 112 in the inner push rod 110 cooperates with the rubber stopper in the vial to push the rubber stopper forward. When the rubber stopper is pushed to the mouth of the vial, the inner push rod 110 stops moving. Visually, as Figure 10 shown, the push block 112 can be seen through the window 17 on the front case 240, and when the push block 112 stops moving, it indicates the end of the injection action in this embodiment. The user can remove the automatic syringe device of the present invention from the skin.

[0082] In a specific embodiment of the present invention, when the user removes the syringe of the present invention from the skin, the injection ring 140 is reset under the axial force of the axial elastic element 190. The injection transmission member 180 connected to the injection ring 140 and the concealed head 170 connected to the injection transmission member 180 are also reset synchronously, returning to the initial concealed state, and hiding the needle inside the syringe. Since the injection ring limiting structure 163 of the locking member 160 cooperates with the injection ring 140 to restrict the injection ring 140 from detaching from the locking member 160, the reset of the injection ring 140 drives the locking member 160 to act. The locking sub-member 165 is fastened to the safety lock cover 220. When the reset of the injection ring 140 is completed, the locking sub-member limiting structure 164 on the locking member 160 disengages from the limiting space 166 of the locking sub-member 165 and cooperates with one end face of the limiting space 166. At the same time, the locking piece limiting structure 161 of the locking member 160 cooperates with the injection transmission member 180 and cannot pass through the injection transmission member 180. Thus, both ends of the locking member 160 are limited by the locking sub-member 165 and the injection transmission member 180 respectively. Relatively speaking, the injection transmission member 180 is limited and cannot move axially anymore, and the concealed head 170 connected to it is also limited and cannot move anymore, thereby completing the locking of the concealed head 170 after injection.

[0083] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A needle concealing locking structure, characterized in that: It includes a hidden head (170), an injection ring (140) and a locking piece (160); The hidden head (170) is in contact with the injection ring (140) through a connecting portion, a stopper (142) and a through hole (143) are provided inside the injection ring (140), and a locking piece (162) is provided on the locking member (160); The locking member (160) is configured to be rotatable. When the locking plate (162) is rotated to the axial direction of the stopper (142), the injection ring (140) is restricted from axial movement by the locking member (160), thereby locking the hidden head (170) before injection. When the locking plate (162) is rotated to the axial direction of the through hole (143), the locking plate (162) can pass through the through hole (143) of the injection ring (140) to move axially, thereby unlocking the locked state of the hidden head (170).

2. The needle concealment locking structure according to claim 1, characterized in that: An injection ring limiting structure (163) is provided on the locking plate (162), and the injection ring limiting structure (163) has a certain slope and is used to limit the movement of the injection ring (140) when passing through the injection ring limiting structure (163).

3. The needle concealment locking structure according to claim 2, characterized in that: It also comprises a locking sub-component (165), wherein the locking component (160) and the locking sub-component (165) are provided with mutually matching snap-fitting structures to realize synchronous rotation of the two.

4. The needle concealment locking structure according to claim 3, characterized in that: The locking sub-component (165) is provided with a locking piece limiting structure (161) and a limiting space (166); the locking piece (162) is provided with a locking sub-component limiting structure (164); the locking sub-component limiting structure (164) is arranged in the limiting space (166); when the locking piece (160) rebounds with the injection ring (140), the locking sub-component limiting structure (164) can be separated from the limiting space (166); the end surface of the locking sub-component limiting structure (164) abuts against the end surface of the locking piece limiting structure (161), thereby realizing the locking state of the hidden head (170) after the injection is completed.

5. The needle concealment locking structure according to claim 4, characterized in that: It also includes a safety lock cover (220); the safety lock cover (220) is arranged at the other end opposite to the hidden head (170); the safety lock cover (220) and the locking sub-component (165) are provided with mutually matching snap-fit ​​structures to achieve synchronous rotation of the two.

6. The needle concealment locking structure according to claim 5, characterized in that: It also includes an axial elastic element (190), wherein the axial elastic element (190) is arranged between the injection ring (140) and the safety lock cover (220).

7. The needle concealment locking structure according to any one of claims 4 to 6, characterized in that: The outer diameter of the injection ring limiting structure (163) gradually increases from the end close to the hidden head (170) to the end away from the hidden head (170), forming a slope, and a protrusion is formed at the bottom of the maximum outer diameter away from the hidden head. The injection ring limiting structure (163) can be deformed when subjected to axial force, and the injection ring (140) can be limited by the end face of the protrusion when passing through the injection ring limiting structure (163).

8. The needle concealing locking structure according to claim 7, characterized in that: The outer diameter of the locking sub-component limiting structure (164) gradually increases from one end close to the hidden head (170) to one end away from the hidden head (170), forming a slope, and an end face is formed on the side away from the hidden head at the maximum outer diameter. The locking sub-component limiting structure (164) can be deformed when subjected to an axial force; the inner diameter of the locking plate limiting structure (161) gradually increases from one end close to the hidden head (170) to one end away from the hidden head (170), forming a slope, and an end face is formed on the side close to the hidden head at the minimum inner diameter.

9. The needle concealment locking structure according to claim 1, characterized in that: The connecting part comprises a push rod module and a rotating elastic element (130); the rotating elastic element (130) is connected to the push rod module; the injection ring (140) is provided with a limiting tooth (141), and the push rod module is provided with a matching limiting tooth (122) that can engage with the limiting tooth (141).

10. A syringe, characterized in that: It comprises the needle concealing locking structure as described in any one of claims 1 to 9.

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