Needle head hiding and locking structure and injector

Abstract

The invention provides a needle head hiding and locking structure and an injector, and belongs to the technical field of medical instruments. The needle hiding and locking structure comprises a hiding head, an injection ring and a locking piece, the hidden head abuts against the injection ring through the connecting part, a stop part and a through hole are arranged in the injection ring, and a locking piece is arranged on the locking piece. The locking piece is configured to be rotatable, and when the locking piece is rotated to the axial direction of the stopping part, the axial movement of the injection ring is limited by the locking piece, so that the hidden head is locked before injection; when the locking piece is rotated to the axial direction of the through hole, the locking piece can penetrate through the through hole of the injection ring to conduct axial movement, and therefore unlocking of the hidden head in the locking state is achieved. The injection step is greatly simplified, the operation convenience of a patient is improved, the needle is hidden in the whole process, the needle is automatically hidden after being moved away from the injection part, the hidden state is locked, and the injury caused by mistaken touch of the needle after the patient uses the device and the cross infection risk caused by mistaken touch of the needle when the device is discarded are avoided.

Description

Technical Field

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

[0002] At present, at home and abroad, the syringes commonly used in medical treatment require professional medical staff to manually and continuously press the syringe plunger for injection, and the medical staff are required to use the syringe to draw a certain amount of medicine into the syringe in advance; for the use environment and conditions of some drugs, this method is time-consuming and labor-intensive, and it is impossible to quickly and easily inject patients, and patients cannot carry it alone for self-rescue and self-treatment; thus causing many inconveniences to patients and users.

[0003] Therefore, some automatic injection pens have appeared in the market. These automatic injection pens can simplify the injection operation, meet the patient's needs for self-injection, and do not require professional doctors to provide operation guidance. They are portable, fast, and simple, and well solve the injection and use needs of some drugs and the emergency use needs of patients. However, the existing automatic injection pens have a complex structure and require multiple steps before injection. The hidden head is movable. During and after the injection, the hidden head will move backwards, and the needle will be exposed, which has an impact on the patient's psychology and may cause harm to the patient due to misoperation or accidental contact, and cannot meet the use needs. Summary of the invention

[0004] In order to solve the technical problems existing in the prior art, the present invention provides a needle concealment locking structure and a syringe. The present invention can realize automatic injection in one step after the safety lock is unlocked, which greatly simplifies the injection steps, reduces the learning time for the use of the device, and improves the convenience of patient operation. The present invention can lock the hidden head when it is not needed, and lock the hidden head after the injection, so that the needle is hidden during the whole process of the device, weakening the psychological impact of the needle on the patient, increasing the effectiveness of needle protection, and realizing the automatic hiding and locking of the needle after it is removed from the injection site. The hidden state avoids the risk of cross infection caused by accidental touching of the needle by the patient after use and accidental touching of the needle when the device is discarded.

[0005] The present invention provides a needle concealment locking structure, comprising a concealed needle, an injection ring and a locking member;

[0006] The hidden head is in contact with the injection ring through the connecting portion, a stopper and a through hole are provided inside the injection ring, and a locking piece is provided on the locking member;

[0007] The locking piece is configured to be rotatable. When the locking piece is rotated to the axial direction of the stopper, the injection ring is restricted from axial movement by the locking piece, thereby locking the hidden 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 portion includes a push rod module and a rotating elastic element; the rotating elastic element is connected to the push rod module; the injection ring is provided with a limiting tooth, and the push rod module is provided with a matching limiting tooth that can engage with the limiting tooth.

[0017] The present invention provides a syringe, comprising the needle concealing locking structure mentioned above.

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

[0019] (1) The present invention achieves hiding and protection of the needle of the syringe before use and safe locking of the injection function by cooperating with the connecting part, the injection ring, the locking part, the locking sub-part and the safety lock cover, which can prevent the syringe from being accidentally triggered before use and thus becoming scrapped; it avoids the patient from accidentally touching the needle after use and causing injury; at the same time, it also protects the needle to prevent the risk of cross infection caused by accidental contact of the needle when the device is discarded, and prevents it from being contaminated or damaged during packaging, transportation and other links.

[0020] (2) The present invention realizes one-step automatic injection of the device after the safety lock is unlocked by cooperating with the hidden head, injection ring and connecting part; the use process of the syringe is simplified, and it only needs to be directly inserted into the skin to automatically inject during the insertion process, without the need for other operating steps, which reduces the patient's learning requirements for the use of the injection device, greatly improves the convenience of operation, and also reduces the requirements for users, making it more universal. In certain preferred embodiments, the connection between the injection ring and the hidden head is realized by adding an injection transmission member, and force transmission is achieved, so that the space inside the shell is better utilized, the structural design of the hidden head is simpler, and the one-step automatic injection of the device after the safety lock is unlocked is realized by cooperating with the hidden head, injection transmission member, injection ring and external push rod.

[0021] (3) The present invention realizes automatic hiding of the needle after injection and locking of the hidden state by means of the cooperation of the locking part, the locking sub-part, the axial elastic element, the concealing head and the injection transmission part; after one use, the needle can be automatically hidden again and locked in the hidden state, thereby preventing the needle from harming the user and also preventing the used needle from harming the handler and cross infection during the garbage disposal process.

[0022] (4) The present invention hides the needle during the entire use process by cooperating with the concealing head and other related components. The user cannot see the needle during the entire use process from opening the device to discarding the automatic injector device after use, which weakens the psychological impact of the needle on the patient and improves the patient's operating comfort, making the present invention suitable for a wider range of audiences. At the same time, it also improves the effectiveness of needle protection and reduces misoperation and secondary injuries caused by fear. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0024] Figure 2 A perspective view of an unlocked state of a syringe according to an embodiment of the present invention;

[0025] Figure 3 for Figure 2 A partial enlarged view of the middle A;

[0026] Figure 4 A front view of an unlocked state of a syringe according to an embodiment of the present invention;

[0027] Figure 5 for Figure 4 Middle AA section view;

[0028] Figure 6 A perspective view of an unlocked state of a syringe according to an embodiment of the present invention;

[0029] Figure 7 for Figure 6 A partial enlarged view of point B in the middle;

[0030] Figure 8 A front view of an unlocked state of a syringe according to an embodiment of the present invention;

[0031] Fig. 9 for Figure 8 Middle BB section view;

[0032] Fig.10 A three-dimensional diagram of a syringe according to an embodiment of the present invention (including a safety lock cover but excluding an injection device cover);

[0033] Fig.11 A three-dimensional diagram of an injection ring according to an embodiment of the present invention;

[0034] Fig.12 is an axonometric view of a rear housing in one embodiment of the present invention;

[0035] Fig.13 is a three-dimensional diagram of a locking member in one embodiment of the present invention;

[0036] Fig.14 is a three-dimensional diagram of a locking sub-component in one embodiment of the present invention;

[0037] Fig.15 An exploded view of the cooperation between the locking member and the locking sub-member in one embodiment of the present invention;

[0038] Fig.16 A three-dimensional view of the positions of a locking member, a locking sub-member and an injection ring in an unlocked state in one embodiment of the present invention;

[0039] Fig.17 This is a three-dimensional view of the positions of the locking member, the locking sub-member and the injection ring during injection after unlocking in one embodiment of the present invention.

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

[0041] 110-inner push rod, 111-groove, 112-push block, 120-outer push rod, 121-protrusion, 122-matching limit teeth, 123-tooth structure, 130-rotation elastic element, 140-injection ring, 141-limiting teeth, 142-stopping part, 143-through hole, 144-first blocking part, 145-second blocking part, 150-thread buckle, 160-locking piece, 161-locking sheet Limiting structure, 162-locking plate, 163-injection ring limiting structure, 164-locking sub-component limiting structure, 165-locking sub-component, 166-limiting space, 170-hidden head, 180-injection transmission part, 190-axial elastic element, 210-medicine chamber, 220-safety lock cover, 230-rear shell, 240-front shell, 231-groove, 232-lock and unlock icons, 310-window. DETAILED DESCRIPTION

[0042] The specific implementation modes of the present invention are described in detail below in conjunction with the accompanying drawings.

[0043] The present invention provides a needle concealment locking structure, comprising a concealed head 170, an injection ring 140 and a locking member 160; the concealed head 170 abuts against 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 connecting portion is a portion for transmitting the movement of the concealed head 170 to 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 stopper 142, the injection ring 140 is restricted from axial movement by the locking member 160, thereby locking 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 pass through the through hole 143 of the injection ring 140 to perform axial movement, thereby unlocking 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 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 forming an end face on the side away from the hidden head at the maximum outer diameter, and the locking sub-component limiting structure 164 can be deformed when subjected to 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 forming an end face on the side close to the hidden head at the minimum inner diameter.

[0054] According to a specific embodiment of the present invention, the connecting part includes a push rod module and a rotating elastic element; 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 bite with the limiting tooth 141. The rotating elastic element 130 is the power source for injection.

[0055] The present invention provides a syringe, comprising the needle concealing locking structure mentioned above.

[0056] In some 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 a matching limit tooth 122 that can engage with the limit tooth 141. The outer push rod 120 is used for locking before injection and injection power transmission; the inner push rod 110 is used to push the rubber plug in the pre-filled injection module for injection.

[0057] In some specific embodiments of the present invention, an injection transmission member 180 is further included. The injection transmission member 180 is disposed between the hidden head 170 and the injection ring 140. A spring is disposed on the injection transmission member 180, and the matching limit teeth 122 on the push rod module can contact the spring. The injection transmission member 180 is used for injection trigger transmission, locking after injection, and sound prompt during injection.

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

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

[0060] In some specific embodiments of the present invention, a lock and unlock icon 232 is provided on the housing.

[0061] In some specific embodiments of the present invention, a shell is further included, the shell 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 some specific embodiments of the present invention, the medicine chamber 210 and the hidden head 170 are arranged in the front shell 240; the injection ring 140, the locking member 160, the locking sub-member 165 and the rotation elastic element 130 are arranged in the rear shell 230.

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

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

[0065] In some specific embodiments of the present invention, a lock and unlock icon 232 is provided on the rear cover 230 , and a slot 231 corresponding to the lock and unlock icon 232 is also provided on the rear cover 230 .

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

[0067] In some 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 disposed at the front end of the push rod.

[0068] In certain specific embodiments of the present invention, the inner push rod (110) is provided with a groove (111) along the axial direction, and the hollow portion 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 outer push rod (120) driving the inner push rod (110) to rotate synchronously.

[0069] In some specific embodiments of the present invention, the front shell 240 and the rear shell 230 are connected by the threaded buckle 150 , and the threaded buckle 150 and the outer push rod 120 work together to transmit the injection power.

[0070] In a specific embodiment of the present invention, Figure 1As shown, the syringe of the present invention comprises a medicine chamber 210, a front shell 240, a hidden head 170, an inner push rod 110, a rear shell 230, an injection transmission member 180, a rotation 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 hidden 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 arranged in the front shell 240 and the rear shell 230;

[0071] The injection ring 140 and the locking member 160 and the locking sub-member 165 cooperate to limit the movement of the injection ring 140 and the hidden head 170; the injection transmission member 180 is arranged between the hidden head 170 and the injection ring 140, and a spring is arranged on the injection transmission member 180.

[0072] In a specific embodiment of the present invention, Figure 2 The figure shows a stereoscopic view of the syringe of the present invention in an unlocked state, in which the indicator structure on the safety lock cover 220 points to the lock and unlock icon 232; in this state, the user cannot use the device for injection.

[0073] Specific, combined Fig.11 As shown, the top of the injection ring 140 is alternately provided with a stopper 142 and a through hole 143, the bottom of the injection ring 140 corresponding to the through hole 143 is provided with a first stopper 144, and the top of the injection ring 140 corresponding to the through hole 143 is provided with a second stopper 145, and the radius of the first stopper 144 is smaller than the radius of the second stopper 145. The main body of the injection ring 140, corresponding to the connecting part of the through hole 143 and the first stopper 144, is hollow, and the part corresponding to the stopper 142 is solid.

[0074] In a specific embodiment of the present invention, Figure 2-Figure 5 , Fig.16 The figure shows the syringe of the present invention before injection, with the safety lock unlocked. Fig.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, and the locking piece limiting structure 161 cannot pass through the stop portion 142 on the injection ring 140, thereby making it impossible for the injection ring 140 to move along the central axis of the syringe toward the top direction, thereby limiting the movement of the injection transmission member 180 in the same direction, and limiting the movement of the hidden head 170 in this direction by limiting the injection transmission member 180, ultimately producing a locking effect of the hidden head 170, and the user cannot use the automatic injector device of the present invention to perform the expected action.

[0075] Before injection and when the safety lock is not unlocked, 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, Figure 6-Figure 9 , Fig.17 The syringe of the present invention is shown in the state where the safety lock is unlocked, combined with Fig.15 , at this time, the indicator structure on the safety lock cover 220 points to the unlock icon; in this state, the user can perform the preset injection action of the present invention. Figure 2 In the above state, after the safety lock cover 220 is unlocked by a preset action (for example, the safety lock cover is rotated), one end of the locking member 160 is moved from the stopper 142 of the injection ring 140 into the through hole 143 of the injection ring 140, so that the locking member 160 is in the unlocked state, and the syringe of the present invention is transformed into Figure 6-Figure 9 Unlocked state shown.

[0077] After the safety lock cover 220 is unlocked by a preset action (for example, the safety lock cover 220 is rotated), the locking member 160 moves along with the safety lock cover 220 to reach the position where the safety lock cover 220 is unlocked. Figure 6-9 In this state, the locking piece limiting structure 161 on the locking member 160 no longer cooperates with the stopper 142 on the injection ring 140, but instead cooperates with the through hole 143 on the injection ring 140, thereby releasing the constraint on the movement of the central axis of the injection ring 140 in this embodiment toward the top direction, and the injection transmission member 180 connected to the injection ring 140 and the hidden head 170 connected to the injection transmission member 180 are both freed 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 safety lock of the syringe of the present invention is unlocked, the hidden head 170 has moved to be flush with the end surface of the front shell 240 under the action of the user (moving the syringe device close to the skin and close to the skin). Because the syringe is inserted into the body, when the hidden head 170 moves toward the front shell 240, the needle in the front shell 240 also pierces the user's body, thereby achieving that the patient cannot see the needle during use. When the hidden head 170 moves to the injection transmission member 180 connected thereto, and the injection ring 140 connected to the injection transmission member 180 also moves toward the end of the front shell 240. When the injection ring 140 moves toward the end of the front shell 240, the locking member 160 will relatively make its locking piece limiting structure 161 pass through the through hole 143 of the injection ring 140, and make the injection ring limiting structure 163 on the locking member 160 cooperate with the injection ring 140, restricting the injection ring 140 from detaching from the locking member 160.

[0079] When the syringe is in the unlocked state, there is a slot 231 corresponding to the lock and unlock icons 232 on the rear shell 230. The slot 231 ensures that the user can only move from the locked position to the unlocked position and cannot move in the reverse direction during normal use. Whether in the safety lock locked or unlocked state, the window 310 on the front shell 240 can always observe the medicine bottle loaded in the device.

[0080] When the syringe is used with the safety lock unlocked, Figure 1 , 6 -9. Fig.17 As shown, the limiting teeth 141 on the injection ring 140 and the matching limiting teeth 122 on the outer push rod 120 are no longer meshed, and the outer push rod 120 rotates under the action of the rotating elastic element 130, thereby driving the inner push rod 110 forward through the threaded engagement. While the outer push rod 120 rotates, the tooth structure 123 on the outer push rod 120 cooperates with the spring on the injection transmission member 180 to produce a specific sound effect, which is used as a 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 plug in the medicine bottle to push the rubber plug forward until the rubber plug is pushed to the mouth of the medicine bottle, and the inner push rod 110 stops moving. Fig.10 As shown, the push block 112 can be seen in the window 17 on the front shell 240, and when the push block 112 no longer moves, it indicates that the injection action of this embodiment is finished. The user can take the automatic injector device of the present invention away 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, and the injection transmission member 180 connected to the injection ring 140 and the hidden head 170 connected to the injection transmission member 180 are also reset synchronously, returning to the initial hidden state, and hiding the needle in the syringe. Since the injection ring limiting structure 163 of the locking member 160 cooperates with the injection ring 140, the injection ring 140 is constrained from being detached from the locking member 160, so the reset of the injection ring 140 drives the locking member 160 to move. The locking sub-component 165 is fastened to the safety lock cover 220. When the injection ring 140 is reset, the locking sub-component limiting structure 164 on the locking component 160 disengages from the limiting space 166 of the locking sub-component 165 and cooperates with one end face of the limiting space 166; at the same time, the locking plate limiting structure 161 of the locking component 160 cooperates with the injection transmission component 180 and cannot pass through the injection transmission component 180; so far, the two ends of the locking component 160 are respectively limited by the locking sub-component 165 and the injection transmission component 180. Relatively speaking, the injection transmission component 180 is limited and can no longer move in the axial direction, and the hidden head 170 connected thereto is also limited and can no longer move, thereby completing the locking of the hidden head 170 after injection.

[0083] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. 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 achieve 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 (20) and a limiting space (166), and 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), and the end surface of the locking sub-component limiting structure (164) abuts against the end surface of the locking piece limiting structure (20), 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), 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.

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 (20) 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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