A lock assembly, a drive mechanism and a drug injection device

Abstract

The embodiment of the present application discloses a locking assembly, a driving mechanism and a medicine injection device. The locking assembly comprises a driving shaft, a first locking part and an elastic part. One end of the driving shaft is provided with a driving part. The driving shaft is used to drive the rotation of a component opposite to the driving part. The driving shaft is used to be connected with a torsion spring. The first locking part is coaxially arranged with the driving shaft. The driving shaft is sequentially and spacedly provided with first tooth parts around the central axis. The first locking part is sequentially and spacedly provided with second tooth parts around the central axis. Each first tooth part is adapted to the rotation of the driving shaft to be in gear engagement with different second tooth parts. The elastic part is used to make the first tooth part and the second tooth part in gear engagement. Before the medicine injection device is used, the locking assembly completes the force storage of the torsion spring. When the medical staff uses the medicine injection device, the locking assembly releases the restriction on the torsion spring. The torsion spring drives the corresponding injection mechanism to act on the tail part of the medicine carrier through the driving shaft, so as to complete the injection of the medicine into the human body.

Description

Technical Field

[0001] This application relates to the technical field of drug injection devices, and more particularly to a locking component, a drive mechanism, and a drug injection device. Background Technology

[0002] During treatment, some medications can be injected into the body using a drug injection device, such as smegglutide for diabetes.

[0003] In related technologies, drug injection devices include a housing, a pusher structure, and a drug carrier. The housing defines a loading cavity for loading the drug carrier. The pusher structure is arranged along the axial direction of the housing and is threadedly connected to the housing. The end of the pusher structure abuts against the tail of the drug carrier. In actual use, medical personnel manually rotate the pusher structure, which acts on the drug carrier, thereby completing the injection of the drug into the body.

[0004] However, with the above-mentioned structure, medical staff need to manually rotate the push rod continuously to ensure that the drug is continuously injected into the body. As can be seen, the drug injection device is inconvenient to use. Summary of the Invention

[0005] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a locking component, a driving mechanism, and a drug injection device, which can achieve better dosage control.

[0006] In a first aspect, embodiments of this application provide a locking assembly for maintaining a torsion spring in a torsional state. The locking assembly includes a drive shaft, a first locking element, and an elastic element, wherein:

[0007] One end of the drive shaft is provided with a drive unit, the drive shaft is used to drive the component that is in contact with the drive unit to rotate, and the drive shaft is used to connect with the torsion spring;

[0008] The first locking member is arranged on the same central axis as the drive shaft. The drive shaft is provided with first teeth spaced apart in sequence around the central axis. The first locking member is provided with second teeth spaced apart in sequence around the central axis. Each first tooth is adapted to rotate the drive shaft so as to mesh with a different second tooth.

[0009] The elastic element acts on either the drive shaft or the first locking element to make the first tooth mesh with the second tooth.

[0010] According to some embodiments of the present invention, the locking assembly further includes a second locking member, the first locking member and the second locking member are arranged on the same central axis, one of the first locking member and the second locking member is provided with a first elastic arm and a first locking portion provided on the first elastic arm, and the other is provided with a first locking groove at intervals around the central axis, the first locking portion is engaged with the first locking groove and is slidable along the axial direction of the first locking groove;

[0011] Wherein, the resistance of the first locking part and the first locking groove in the first circumferential direction is greater than the resistance of the first tooth and the second tooth in the first circumferential direction, and the resistance of the first locking part and the first locking groove in the second circumferential direction is less than the resistance of the first tooth and the second tooth in the second circumferential direction. The first circumferential direction and the second circumferential direction are arranged opposite to each other, and the second circumferential direction is the direction of the torsion force of the torsion spring.

[0012] According to some embodiments of the present invention, the second locking member is rotatably connected to the drive shaft, and the elastic member abuts between the first locking member and the second locking member.

[0013] According to some embodiments of the present invention, the locking assembly further includes a connector connected to the second locking member and the drive shaft, and rotatably connected to at least one of them, wherein the elastic member abuts between the first locking member and the second locking member.

[0014] According to some embodiments of the present invention, the connector includes an annular portion and an annular protrusion, the annular protrusion being connected to the inner side of the end of the annular portion, and the outer wall of the annular portion being provided with a snap-fit ​​portion;

[0015] The second locking member has a locking hole on its side wall, and the drive shaft has an annular groove on its circumferential surface. The annular portion is at least partially located inside the second locking member so that the locking portion engages with the locking hole, and the annular protrusion is rotatably embedded in the annular groove.

[0016] According to some embodiments of the present invention, the connector includes an annular portion and an annular flange, the annular flange being connected to the inner side of the end of the annular portion, the circumferential surface of the drive shaft being provided with an annular groove, the sidewall of the annular groove away from the drive portion being provided with a third tooth, and the inner side of the annular flange being provided with a fourth tooth for meshing with the third tooth.

[0017] The width of the annular groove is greater than the thickness of the annular protrusion, and the drive shaft and the connector can move relative to each other in the axial direction so that the third tooth and the fourth tooth can switch between engagement and disengagement.

[0018] According to some embodiments of the present invention, the outer wall of the second locking member has a first circumferential limiting portion extending axially, and the second locking member is used to slide axially and be circumferentially fixed with the housing through the first circumferential limiting portion.

[0019] According to some embodiments of the present invention, the drive shaft includes a shaft body, a first ring portion and a second ring portion. The drive portion is provided at one end of the shaft body. The first ring portion is provided on the circumferential surface of the shaft body near the end of the drive portion. The first ring portion has a connecting hole for connecting the torsion spring. The second ring portion is provided around the first ring portion. The circumferential surface of the second ring portion has an annular groove. The drive shaft is rotatably connected to the connector or the second locking member through the annular groove. The end face of the second ring portion away from the drive portion is provided with the first tooth portion.

[0020] Secondly, embodiments of this application provide a driving mechanism, including:

[0021] case;

[0022] The aforementioned locking assembly is disposed on the inner side of the housing;

[0023] A torsion spring is sleeved on the outside of the drive shaft, with one end connected to the drive shaft and the other end connected to the housing.

[0024] Thirdly, embodiments of this application provide a drug injection device, comprising:

[0025] The aforementioned drive mechanism;

[0026] A push rod structure is disposed inside the housing and is used to act on the tail of the drug carrier;

[0027] A fixing element is disposed on the inner side of the housing, and the push rod structure is threadedly connected to the fixing element;

[0028] A transmission component is rotatably disposed on the inner side of the housing. The push rod structure slides through the transmission component and is circumferentially fixed to the transmission component. The transmission component is provided with a transmission mechanism for meshing with the drive unit.

[0029] As can be seen from the above technical solutions, the embodiments of this application have the following advantages: This application provides a locking component applicable to drug injection devices. Before the drug injection device is used, the locking component completes the storage of the torsion spring. When medical personnel use the drug injection device, they release the locking component from the torsion spring. The torsion spring drives the corresponding injection mechanism (the transmission component, push rod structure, etc. described below) through the drive shaft to act on the tail of the drug carrier, completing the injection of the drug into the human body. Thus, the locking component makes the drug injection device more convenient to use. Attached Figure Description

[0030] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0031] Figure 1 This is an exploded view of the locking assembly according to an embodiment of the present invention;

[0032] Figure 2 This is a schematic diagram of the structure of the first locking member and the second locking member according to an embodiment of the present invention;

[0033] Figure 3 This is a schematic diagram of the structure of a drive shaft according to an embodiment of the present invention;

[0034] Figure 4 This is a schematic diagram of the locking component from another angle according to an embodiment of the present invention;

[0035] Figure 5 This is an axial sectional view of the locking assembly according to an embodiment of the present invention;

[0036] Figure 6 This is a schematic diagram of another drive shaft according to an embodiment of the present invention;

[0037] Figure 7 This is a schematic diagram of the structure of the housing and the second locking member according to an embodiment of the present invention;

[0038] Figure 8 This is a schematic diagram of the drive shaft and torsion spring according to an embodiment of the present invention;

[0039] Figure 9 This is an axial sectional view of the drug injection device according to an embodiment of the present invention;

[0040] Figure 10 This is a partial exploded view of the drug injection device according to an embodiment of the present invention;

[0041] Figure 11 This is a schematic diagram of the overall structure of the drug injection device according to an embodiment of the present invention.

[0042] Figure label:

[0043] 10. Drug carrier; 100. Locking assembly; 110. Drive shaft; 111. Shaft body; 1111. Drive unit; 112. First ring portion; 1121. Connecting hole; 113. Second ring portion; 1131. Annular groove; 1132. First tooth portion; 1133. Third tooth portion; 120. First locking element; 121. Second tooth portion; 122. First elastic arm; 1221. First locking portion; 123. First inner protrusion; 130. Second locking element; 131. First protruding ring; 132. First circumferential limiting portion; 133. Snap hole; 134. Guide notch; 135. Second inner protrusion; 136. First locking groove; 140. Elastic element; 15 0. Connector; 151. Annular part; 152. Annular protrusion; 1521. Fourth tooth; 153. Guide protrusion; 154. Snap-fit ​​part; 200. Housing; 210. Head housing; 220. Tail housing; 221. Observation port; 222. Second protruding ring; 223. Second circumferential limiting part; 230. Knob; 240. Button; 250. Injection needle; 300. Torsion spring; 400. Push rod structure; 500. Transmission component; 510. Transmission part; 520. Second elastic arm; 521. Second locking part; 600. Fixing component; 700. Holding component; 710. Second locking groove; 800. Scale cylinder; 810. Transmission cylinder. Detailed Implementation

[0044] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0045] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, up, down, etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0046] In the description of this invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0047] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0048] In the description of this invention, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0049] To more clearly describe the locking assembly 100, the housing 200 disposed outside the locking assembly 100 is introduced in the description (see reference). Figure 9 ).

[0050] A locking component 100 is disclosed according to an embodiment of this application, referring to... Figure 1 The locking assembly 100 is used to keep the torsion spring 300 in a torsion state. It includes a drive shaft 110, a first locking member 120, and an elastic member 140. One end of the drive shaft 110 is provided with a drive part 1111. The drive shaft 110 is used to drive the component that is connected to the drive part 1111 to rotate. The drive shaft 110 is used to connect with the torsion spring 300. The first locking member 120 is arranged on the same central axis as the drive shaft 110. The drive shaft 110 is provided with first teeth 1132 at intervals around the central axis. The first locking member 120 is provided with second teeth 121 at intervals around the central axis. Each first tooth 1132 is adapted to rotate the drive shaft 110 to mesh with a different second tooth 121. The elastic member 140 acts on one of the drive shaft 110 and the first locking member 120 to mesh the first tooth 1132 with the second tooth 121.

[0051] Specifically, during the charging process of the torsion spring 300, medical personnel control the drive shaft 110 to rotate forward, thereby causing the first tooth 1132 to rotate forward. During the rotation, the first tooth 1132 interacts with the second tooth 121, and the first tooth 1132 and the second tooth 121 move separately along the central axis. Each first tooth 1132 moves to the position corresponding to the next second tooth 121, and under the action of the elastic element 140, it engages with the second tooth 121 again. Thus, during the rotation of the drive shaft 110, the first tooth 1132 and the second tooth 121 cycle through the above process until the charging of the torsion spring 300 reaches the set requirement, and the rotation of the drive shaft 110 stops. The elastic element 140 causes the second tooth 121 to engage with the corresponding first tooth 1132, the first locking element 120 keeps the drive shaft 110 in the rotated state, and the torsion spring 300 is in a torsion state. The drive shaft 110 drives the component (transmission member 500) that is connected to the drive unit 1111 to rotate, thereby providing injection power to the injection device, which will be described in detail later.

[0052] As can be seen from the above, this application provides a locking component 100 applicable to a drug injection device. Before use, the locking component 100 stores the torsion spring 300. When using the drug injection device, medical personnel release the locking component 100 from the torsion spring 300. The torsion spring 300 then drives the corresponding injection mechanism (such as the transmission component 500 and push rod structure 400 described below) via the drive shaft 110 to act on the tail of the drug carrier 10, completing the injection of the drug into the human body. Thus, the locking component 100 makes the drug injection device more convenient to use.

[0053] Furthermore, the first tooth 1132 or the second tooth 121 has a sufficient number of teeth in the circumferential direction, and the first locking member 120 can keep the drive shaft 110 in various rotational positions. Therefore, during the charging process of the torsion spring 300, medical personnel can adjust the degree of torsion of the torsion spring 300 to any size as needed, and the drug injection device can automatically inject any amount of drug into the human body, making the drug injection device more flexible in use.

[0054] In some embodiments, refer to Figure 1 and Figure 2The locking assembly 100 further includes a second locking member 130, which is at least partially disposed on the outside of the first locking member 120 and coaxially arranged. The side of the first locking member 120 is provided with a circumferentially extending first elastic arm 122, and the end of the first elastic arm 122 is provided with an outwardly protruding first locking portion 1221. Meanwhile, the inner side of the second retaining member 700 is provided with sequentially spaced first locking grooves 136 around its central axis, and the first locking grooves 136 extend axially. The first locking portion 1221 is embedded in the inner side of the first locking groove 136 and can slide axially along the first locking groove 136. The resistance of the first locking part 1221 and the first locking groove 136 in the first circumferential direction is greater than the resistance of the first tooth part 1132 and the second tooth part 121 in the first circumferential direction, and the resistance of the first locking part 1221 and the first locking groove 136 in the second circumferential direction is less than the resistance of the first tooth part 1132 and the second tooth part 121 in the second circumferential direction. The first circumferential direction and the second circumferential direction are arranged in opposite directions, and the second circumferential direction is the torque direction of the torsion spring 300.

[0055] In this embodiment, the first circumferential direction is described as the positive direction. In practical applications, the first circumferential direction can also be the reverse direction.

[0056] Specifically, the drive shaft 110 rotates in the forward direction by overcoming the circumferential elastic force of the torsion spring 300 and the circumferential resistance of the second tooth 121 against the first tooth 1132. Since the resistance of the first locking part 1221 and the first locking groove 136 in the forward direction is greater than the resistance of the first tooth 1132 and the second tooth 121 in the forward direction, the resistance of the second locking member 130 against the first locking member 120 in the forward direction is greater during the forward rotation of the drive shaft 110. The first locking member 120 slides axially, and the first locking part 1221 slides axially along the first locking groove 136 without rotating forward with the drive shaft 110. After the drive shaft 110 has finished rotating, it stops rotating. Under the action of the elastic member 140, the second tooth 121 engages with the first tooth 1132, and the drive shaft 110 remains in its rotated position, while the torsion spring 300 maintains its torsional state. If the drive shaft 110 rotates too much in the forward direction, it is controlled to rotate in the reverse direction. Since the resistance of the first locking part 1221 and the first locking groove 136 in the reverse direction is less than the resistance of the first tooth 1132 and the second tooth 121 in the reverse direction, during the reverse rotation of the drive shaft 110, the first locking member 120 rotates synchronously in the reverse direction with the drive shaft 110, the first elastic arm 122 undergoes inward elastic deformation, and the first locking part 1221 jumps sequentially in the first locking groove 136. When the drive shaft 110 rotates to the appropriate position in the reverse direction, the first elastic arm 122 causes the first locking part 1221 to engage with the corresponding first locking groove 136. Therefore, the first locking member 120 keeps the drive shaft 110 in the rotated position, and the torsion spring 300 is in a torsional state.

[0057] In summary, by adopting the locking assembly 100 with the above-described structure, the drive shaft 110 can be adjusted in both the forward and reverse directions, and the locking assembly 100 has good flexibility; furthermore, during the rotation of the drive shaft 110, two sets of clutch mechanisms are used to hold the drive shaft 110, resulting in high stability of the drive shaft 110.

[0058] In addition, the first locking member 120 and the second locking member 130 are not limited to the above-mentioned connection method. For example, the outer side of the first locking member 120 is provided with a first locking groove 136 around the central axis, and the inner side of the second locking member 130 is provided with a first elastic arm 122 and a first locking part 1221 provided at the end of the first elastic arm 122. The first locking part 1221 is embedded in the first locking groove 136 and can slide axially.

[0059] Understandably, traditional syringe pens suffer from low precision in their helical drive mechanisms. To prevent jamming or even stuck-out situations during use, the helical lead is typically designed to be large. Therefore, for large-dose administration, the longer pen body significantly impacts grip and the applied injection pressure. In this application, the locking assembly structure boasts high precision, ensuring that even with a smaller helical lead design, jamming or stuck-out issues are avoided.

[0060] Furthermore, the locking assembly 100 driven by the torsion spring 300 has a clear and accurate dosage dispensing mechanism, ensuring high dosage accuracy and safer operation. When this locking assembly 100 is used in the drug injection device, the minimum dosage of the drug injection device is extended to below 0.01 ml, such as 0.0075–0.005 ml, meeting the drug administration needs of children. The maximum dosage is 0.80 ml–1.0 ml.

[0061] In one embodiment, reference is made to... Figure 2 and Figure 3 The locking assembly 100 also includes a connector 150, which is connected to the second locking member 130 and the drive shaft 110. The connector 150 connects the drive shaft 110 to the second locking member 130, and the elastic member 140 abuts against the first locking member 120 and the second locking member 130. It is understood that the various components of the locking assembly 100 can be assembled as a whole, facilitating subsequent assembly into the housing 200. Specifically, the connector 150 is rotatably connected to at least the second locking member 130 or the drive shaft 110. The second locking member 130 is rotatably connected to the drive shaft 110. Therefore, the first locking member 120 will not interfere with the normal rotation of the drive shaft 110, ensuring the normal use of all components of the locking assembly 100.

[0062] Alternatively, not shown in the figure, the circumferential surface of the front end of the drive shaft 110 is provided with an annular groove 1131, and the inner side of the front end of the second locking member 130 is provided with an annular protrusion 152. The annular protrusion 152 is rotatably fitted into the annular groove 1131, thereby allowing the drive shaft 110 to be rotatably mounted on the second locking member 130. It is understood that the various components of the locking assembly 100 can be assembled into a single unit, facilitating subsequent assembly into the housing 200.

[0063] Furthermore, the connector 150 includes an annular portion 151 and an annular protrusion 152 (see reference). Figure 4The annular flange 152 is connected to the inner side of the front end of the annular portion 151. An annular groove 1131 is provided on the circumferential surface of the front end of the drive shaft 110. The annular portion 151 is at least partially located inside the second locking member 130 and is engaged with the second retaining member 700. The annular flange 152 is rotatably embedded inside the annular groove 1131. During the assembly of the connecting member 150, the drive shaft 110, and the second locking member 130, the connecting member 150 is inserted into the inner side of the second locking member 130 from the front end until the annular portion 151 is engaged with the second locking member 130 and the annular flange 152 is rotatably embedded in the annular groove 1131. Therefore, the connecting member 150 allows for easier assembly of the various components of the locking assembly 100.

[0064] In addition, part of the connector 150 is assembled on the outside of the drive shaft 110, and another part is assembled on the inside of the second locking member 130, making the overall assembly structure of the locking assembly 100 relatively stable.

[0065] Furthermore, the side wall of the second locking member 130 is provided with a guide notch 134 extending to the front end of the second locking member 130, and the side wall of the second locking member 130 is also provided with a locking hole 133. Meanwhile, the outer wall of the annular portion 151 is provided with a guide protrusion 153 and a locking portion 154. The guide protrusion 153 is used to fit into the guide notch 134, and the locking portion 154 is engaged with the locking hole 133. It can be understood that during the assembly process of the connecting member 150, the second locking member 130 positions the guide protrusion 153 through the guide notch 134, thereby positioning the connecting member 150, and thus aligning the locking portion 154 with the locking hole 133 in the circumferential direction, allowing the connecting member 150 to be assembled with the second locking member 130 more precisely.

[0066] In another embodiment, refer to Figures 4 to 6 The locking assembly 100 also includes a connector 150, which includes an annular portion 151 and an annular flange 152. The annular flange 152 is connected to the inner side of the front end of the annular portion 151. The circumferential surface of the front end of the drive shaft 110 is provided with an annular groove 1131. The annular portion 151 is at least partially located inside the second locking member 130 and is engaged with the second locking member 130. The annular flange 152 is rotatably embedded inside the annular groove 1131.

[0067] The annular groove 1131 has a third tooth 1133 facing forward on its sidewall away from the drive unit 1111, or in other words, the third tooth 1133 is located on the rear sidewall of the annular groove 1131. The inner sidewall of the annular flange 152 has a fourth tooth 1521 facing rearward. The third tooth 1133 and the fourth tooth 1521 mesh with each other. The width of the annular groove 1131 is greater than the thickness of the annular flange 152, allowing the drive shaft 110 and the connector 150 to slide relative to each other in the axial direction. Therefore, in one state, the third tooth 1133 and the fourth tooth 1521 are separated from each other, while in another state, they are meshed.

[0068] Specifically, in the initial stage, under the rearward action of the torsion spring 300, the front wall of the annular groove 1131 of the drive shaft 110 is in contact with the front wall of the annular flange 152 (see reference). Figure 5 The third tooth 1133 and the fourth tooth 1521 are in a separated state. Therefore, during the circumferential rotation of the drive shaft 110, the drive shaft 110 does not interfere with the connecting member 150, and the drive shaft 110 can rotate normally. During the docking stage, the drive shaft 110 moves axially forward, and the connecting member 150, the first locking member 120, and the second locking member 130 all move forward. The housing 200 releases the restriction on the rearward movement of the second locking member 130, and the elastic member 140 pushes the first locking member 120 to move rearward relative to the drive shaft 110, thereby causing the connecting member 150 to move rearward relative to the drive shaft 110. The third tooth 1133 and the fourth tooth 1521 mesh, and the connecting member 150 and the drive shaft 110 are circumferentially fixed. Since the connecting member 150 is circumferentially fixed to the second locking member 130, the drive shaft 110 is circumferentially positioned by the connecting member 150 to lock the second locking member 130. This prevents the first locking member 120 from rotating relative to the second locking member 130 due to the instability of the engagement part 154 between the first locking part 1221 and the first locking groove 136, thus reducing the accuracy of the locking assembly 100. During the reset phase, the drive shaft 110 is axially reset to its initial position under the axial action of the torsion spring 300. Since the housing 200 restricts the second locking member 130 axially, the second locking member 130 restricts the position of the connecting member 150. Therefore, under the action of the torsion spring 300, the front side of the annular groove 1131 abuts against the front side of the annular protrusion 152, and the third tooth 1133 and the fourth tooth 1521 are separated, preventing the connecting member 150 from interfering with the rotation of the drive shaft 110.

[0069] To facilitate the assembly of the elastic element 140 between the first locking element 120 and the second locking element 130, in some embodiments, refer to Figure 2The inner side of the first locking member 120 is provided with a first inner protruding edge 123 facing the rear side, and the inner side of the second locking member 130 is provided with a second inner protruding edge 135 connected to the second protruding ring 222. The first inner protruding edge 123 and the second inner protruding edge 135 are arranged opposite to each other. One end of the elastic member 140 is sleeved on the first inner protruding edge 123 and abuts against the first locking member 120, and the other end is sleeved on the second inner protruding edge 135 and abuts against the second locking member 130.

[0070] In some embodiments, refer to Figure 1 and Figure 7 The inner side of the second locking member 130 is provided with a first protruding ring 131. The rear end of the first protruding ring 131 is provided with a first circumferential limiting portion 132 facing the rear side around the central axis. The first circumferential limiting portion 132 extends axially. At the same time, the inner wall of the housing 200 is provided with a second protruding ring 222. The front side of the second protruding ring 222 is provided with a second circumferential limiting portion 223 facing the front side around the central axis. The second circumferential limiting portion 223 extends axially. The first circumferential limiting portion 132 abuts against the second protruding ring 222 and engages with the second circumferential limiting portion 223, so that the second locking member 130 is circumferentially fixed to the housing 200 and can slide axially. Specifically, the drive shaft 110 slides axially between the second position and the first position. When the drive shaft 110 is in the second position, the first circumferential limiting part 132 engages with the second circumferential limiting part 223. During the rotation of the drive shaft 110, the second locking member 130 remains circumferentially fixed, thereby ensuring that the first locking member 120 remains circumferentially fixed. Therefore, the first locking member 120 can prevent the drive shaft 110 from rotating in the opposite direction by engaging the first tooth 1132 with the second tooth 121. The torsion spring 300 is in a torsion state. When the drive shaft 110 moves axially from the second position to the first position, the drive part 1111 of the drive shaft 110 is in contact with the corresponding component (the transmission component 500 described below), the first circumferential limiting part 132 is just separated from the second circumferential limiting part 223, the housing 200 releases the restriction on the locking assembly 100, and the locking assembly 100 can rotate normally under the action of the torsion spring 300, thereby driving the corresponding component (the transmission component 500 described below) to rotate.

[0071] In some embodiments, refer to Figure 3The drive shaft 110 includes a shaft body 111, a first ring portion 112, and a second ring portion 113. A first tooth portion 1132 is disposed around the central axis on the front end face of the shaft body 111. The first ring portion 112 is fixedly connected to the circumferential surface of the front end of the shaft body 111. The first ring portion 112 has a connecting hole 1121 that passes through the front and rear ends of the first ring portion 112. A torsion spring 300 is sleeved on the outside of the shaft body 111. One end of the torsion spring 300 is connected to the connecting hole 1121, and the other end of the torsion spring 300 is connected to the housing 200. The second ring portion 113 is connected around the first ring portion 112. The circumferential surface of the second ring portion 113 is provided with the aforementioned annular groove 1131, and the rear end face of the second ring portion 113 is provided with the aforementioned first tooth portion 1132.

[0072] It is understandable that with the drive shaft 110 of the above-described structure, the various components of the locking assembly 100 and the torsion spring 300 can be compactly assembled together without interfering with each other, and the space inside the housing 200 is fully utilized.

[0073] This application also discloses a drive mechanism, as shown in the reference... Figure 8 and Figure 9 It includes a housing 200, the aforementioned locking assembly 100, and a torsion spring 300. The locking assembly 100 is disposed inside the housing 200. The torsion spring 300 is sleeved on the outside of the drive shaft 110, with one end connected to the drive shaft 110 and the other end connected to the housing 200.

[0074] Specifically, in the initial stage, medical staff rotate the drive shaft 110 forward. When the drive shaft 110 rotates to a set number of revolutions and a set position, the first tooth 1132 and the second tooth 121 mesh, thereby keeping the drive shaft 110 in the rotated position and the torsion spring 300 in a torsional state. In the use stage, medical staff press the drive shaft 110 axially forward, and the drive part 1111 of the drive shaft 110 is connected to the corresponding component (the transmission component 500 described below). At this time, the restriction on the drive shaft 110 is just released, and the drive shaft 110 provides power to the corresponding component, completing the injection of drugs into the human body by the drug injection device.

[0075] This application also discloses a drug injection device, as shown in the reference. Figure 9 and Figure 10The device includes the aforementioned drive mechanism, push rod structure 400, fixing member 600, and transmission member 500. The push rod structure 400 is disposed inside the housing 200 and is used to act on the tail of the drug carrier 10. The fixing member 600 is disposed inside the housing 200, and the push rod structure 400 is threadedly connected to the fixing member 600. The transmission member 500 is rotatably disposed inside the housing 200, and the push rod structure 400 slides through the transmission member 500 and is circumferentially fixed to the transmission member 500. The transmission member 500 is provided with a transmission part 510 for meshing with the drive part 1111.

[0076] The housing 200 includes a tail housing 220 and a head housing 210. The tail housing 220 is connected to the rear side of the fixing member 600, and the inner side of the front end of the tail housing 220 is snapped into the outer side of the fixing member 600. The tail housing 220 is used to mount the locking assembly 100 of the injection device, the fixing member 600, and the transmission member 500, facilitating operation by medical personnel. The head housing 210 is connected to the front side of the fixing member 600, and the outer side of the rear end of the head housing 210 is snapped into the inner side of the fixing member 600. The inner side of the head housing 210 defines a loading cavity, and the head housing 210 is used to load the drug carrier 10. The push rod structure 400 is located inside the tail housing 220, and one end is located in the loading cavity of the head housing 210. The end of the head housing 210 away from the tail housing 220 is provided with an injection needle 250 that is connected to the drug carrier 10. When the push rod structure 400 acts on the tail of the drug carrier 10, the drug of the drug carrier 10 is injected into the human body through the injection needle 250.

[0077] Specifically, the drive part 1111 of the drive shaft 110 meshes with the transmission part 510 of the transmission component 500. The tail housing 220 just releases the restriction on the drive shaft 110. The drive shaft 110 drives the transmission component 500 to rotate synchronously, and the transmission component 500 drives the push rod structure 400 to rotate synchronously. Since the push rod structure 400 is threadedly connected to the fixing component 600, the push rod structure 400 moves axially forward during rotation, thereby acting on the tail of the drug carrier 10, and thus realizing the injection of drugs into the human body by the drug injection device.

[0078] To achieve a sliding connection and circumferential fixation between the transmission component 500 and the push rod structure 400, a guide protrusion is provided on the inner wall of the transmission component 500 along the direction of the central axis, and a guide groove is provided on the side wall of the push rod structure 400 along the axial direction of the central axis. The guide protrusion is slidably disposed in the guide groove, and the push rod structure 400 and the transmission component 500 are relatively slidingly disposed and circumferentially fixed. Of course, the connection method between the push rod structure 400 and the transmission component 500 is not limited to the above-mentioned connection method. For example, the inner wall of the transmission component 500 may also be provided with a guide groove, and the side wall of the push rod structure 400 may be provided with a guide protrusion, which is slidably disposed in the guide groove, to achieve a sliding connection and circumferential fixation between the push rod structure 400 and the transmission component 500.

[0079] Furthermore, the drug injection device also includes a retainer 700, which is disposed on the outside of the transmission member 500 and on the inside of the fixing member 600, and is snapped into the fixing member 600. The inner wall of the retainer 700 is provided with second locking grooves 710 spaced apart around its central axis. A second elastic arm 520 is provided on the circumferential surface of the transmission member 500, and a second locking part 521 is provided at the end of each second elastic arm 520. The second locking part 521 is embedded in the second locking groove 710, wherein the second locking part 521 can engage with different second locking grooves 710 when the transmission member 500 rotates. Specifically, during the drug injection process, the drive shaft 110 drives the transmission component 500 to rotate synchronously, and the transmission component 500 drives the push rod structure 400 to rotate synchronously. The push rod structure 400 moves axially forward, thereby acting on the drug carrier 10. At the same time, during the rotation of the transmission component 500, the second elastic arm 520 and the second locking part 521 also rotate circumferentially. The second elastic arm 520 undergoes elastic deformation, and the second locking part 521 jumps into each of the second locking grooves 710 in sequence. This causes the drug injection device to make a sound and / or generate a slight vibration during the drug injection process, so as to remind medical staff that the drug injection device is injecting drugs into the human body normally.

[0080] Furthermore, the connection method between the retainer 700 and the transmission member 500 is not limited to the one described above. For example, the retainer 700 may have a second elastic arm 520 and a second locking part 521 disposed on the second elastic arm 520, and the transmission member 500 may have a second locking groove 710 disposed on its outer peripheral surface. The second locking part 521 may engage with different second locking grooves 710 when the transmission member 500 rotates. Therefore, during use, the drug injection device can also remind medical personnel that the device is injecting drugs into the human body normally.

[0081] In some embodiments, refer to Figure 10 and Figure 11The injection device also includes a graduated cylinder 800 and a transmission cylinder 810. The graduated cylinder 800 is disposed inside the tail housing 220 and is coaxially arranged with the tail housing 220. The outer circumferential surface of the graduated cylinder 800 is threadedly connected to the inner circumferential surface of the housing 200. The tail housing 220 is provided with an observation port 221, and the outer circumferential surface of the graduated cylinder 800 is provided with graduation lines. The observation port 221 is used to display the graduation lines. The transmission cylinder 810 is slidably sleeved on the outside of the drive shaft 110 and circumferentially fixed to the drive shaft 110. The graduated cylinder 800 is slidably sleeved on the outside of the transmission cylinder 810 and circumferentially fixed to the transmission cylinder 810.

[0082] Specifically, during dosage adjustment, the drive shaft 110 rotates forward, driving the transmission cylinder 810 to rotate forward, which in turn drives the scale cylinder 800 to rotate. Since the scale cylinder 800 is threadedly connected to the tail housing 220, it moves axially backward during rotation, causing the scale lines on its surface to be displayed at the observation port 221, allowing medical personnel to monitor the dosage adjustment status of the injection device. When the dosage is adjusted to the appropriate level, the corresponding scale line is displayed at the observation port 221. During dosage adjustment, the drive shaft 110 and the transmission component 500 are separated, and the push rod structure 400 remains stationary.

[0083] The transmission cylinder 810 has a guide groove on its outer circumferential surface along the axial direction, and the inner wall of the scale cylinder 800 has a guide protrusion along the axial direction. The guide protrusion is slidably embedded in the guide groove, so that the transmission cylinder 810 and the scale cylinder 800 are slidably set and circumferentially fixed.

[0084] In some embodiments, a guide groove is provided on the side of the rear end of the drive shaft 110 along the axial direction, and a guide protrusion is provided on the inner wall of the transmission cylinder 810. The guide protrusion is slidably embedded in the guide groove, so that the drive shaft 110 and the transmission cylinder 810 are slidably arranged relative to each other and circumferentially fixed. The injection device also includes a knob 230, which is rotatably connected to the rear end of the tail housing 220. A guide protrusion is provided on the inner side of the knob 230, and the guide protrusion is slidably embedded in the guide groove, so that the knob 230 and the transmission cylinder 810 are slidably arranged relative to each other and circumferentially fixed. The knob 230 has the function of restricting the transmission cylinder 810 and preventing the transmission cylinder 810 from disengaging from the drive shaft 110. Understandably, during the dosage adjustment process of the injection device, medical staff can drive the drive shaft 110 to rotate via the knob 230. The drive shaft 110 causes the torsion spring 300 to start storing force, and at the same time, it drives the scale cylinder 800 to move axially backward via the transmission cylinder 810. The scale cylinder 800 is used to judge the storage status of the elastic element 140, thereby understanding the subsequent injection volume of the drug injection device.

[0085] In some embodiments, the drug injection device further includes a button 240, which is rotatably and axially slidably connected to the rear end of a knob 230, and the knob 230 abuts against the rear end of a drive shaft 110. During use, medical personnel can press the button 240 axially forward to push the drive shaft 110 axially from a second position to a first position.

[0086] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments, and various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof can be combined with each other unless otherwise specified.

Claims

1. A locking component, characterized in that, The locking assembly, used to maintain the torsion spring in a torsional state, includes a drive shaft, a first locking element, and an elastic element, wherein: One end of the drive shaft is provided with a drive unit, the drive shaft is used to drive the component that is in contact with the drive unit to rotate, and the drive shaft is used to connect with the torsion spring; The first locking member is arranged on the same central axis as the drive shaft. The drive shaft is provided with first teeth spaced apart in sequence around the central axis. The first locking member is provided with second teeth spaced apart in sequence around the central axis. Each first tooth is adapted to rotate the drive shaft so as to mesh with a different second tooth. The elastic element acts on one of the drive shaft and the first locking element to make the first tooth mesh with the second tooth; The locking assembly further includes a second locking member. The first locking member and the second locking member are arranged on the same central axis. One of the first locking member and the second locking member is provided with a first elastic arm and a first locking part provided on the first elastic arm. The other member is provided with a first locking groove at intervals around the central axis. The first locking part is engaged with the first locking groove and can slide along the axial direction of the first locking groove. Wherein, the resistance of the first locking part and the first locking groove in the first circumferential direction is greater than the resistance of the first tooth and the second tooth in the first circumferential direction, and the resistance of the first locking part and the first locking groove in the second circumferential direction is less than the resistance of the first tooth and the second tooth in the second circumferential direction. The first circumferential direction and the second circumferential direction are arranged opposite to each other, and the second circumferential direction is the direction of the torsion force of the torsion spring.

2. A locking assembly according to claim 1, characterized in that, The second locking member is rotatably connected to the drive shaft, and the elastic member abuts between the first locking member and the second locking member.

3. A locking assembly according to claim 1, characterized in that, The locking assembly further includes a connector connected to the second locking member and the drive shaft, and rotatably connected to at least one of them, with the elastic member abutting between the first locking member and the second locking member.

4. A locking assembly according to claim 3, characterized in that, The connector includes an annular portion and an annular protrusion, the annular protrusion being connected to the inner side of the end of the annular portion, and the outer wall of the annular portion being provided with a snap-fit ​​portion; The second locking member has a locking hole on its side wall, and the drive shaft has an annular groove on its circumferential surface. The annular portion is at least partially located inside the second locking member so that the locking portion engages with the locking hole, and the annular protrusion is rotatably embedded in the annular groove.

5. A locking assembly according to claim 3, characterized in that, The connector includes an annular portion and an annular protrusion. The annular protrusion is connected to the inner side of the end of the annular portion. The circumferential surface of the drive shaft is provided with an annular groove. The side wall of the annular groove away from the drive portion is provided with a third tooth. The inner side of the annular protrusion is provided with a fourth tooth for meshing with the third tooth. The width of the annular groove is greater than the thickness of the annular protrusion, and the drive shaft and the connector can move relative to each other in the axial direction so that the third tooth and the fourth tooth can switch between engagement and disengagement.

6. A locking assembly according to any one of claims 2 to 3, characterized in that, The outer wall of the second locking member has a first circumferential limiting portion that extends axially, and the second locking member is used to slide axially with the housing and be circumferentially fixed through the first circumferential limiting portion.

7. A locking assembly according to claim 3, characterized in that, The drive shaft includes a shaft body, a first ring portion, and a second ring portion. The drive portion is provided at one end of the shaft body. The first ring portion is provided on the circumferential surface of the end of the shaft body near the drive portion. The first ring portion has a connecting hole for connecting the torsion spring. The second ring portion is provided around the first ring portion. The circumferential surface of the second ring portion has an annular groove. The drive shaft is rotatably connected to the connector or the second locking member through the annular groove. The end face of the second ring portion away from the drive portion is provided with the first tooth portion.

8. A driving mechanism, characterized in that, include: case; The locking assembly according to any one of claims 1 to 7, wherein the locking assembly is disposed on the inner side of the housing; A torsion spring is sleeved on the outside of the drive shaft, with one end connected to the drive shaft and the other end connected to the housing.

9. A drug injection device, characterized in that, include: The driving mechanism as described in claim 8; A push rod structure is disposed inside the housing and is used to act on the tail of the drug carrier; A fixing element is disposed on the inner side of the housing, and the push rod structure is threadedly connected to the fixing element; A transmission component is rotatably disposed on the inner side of the housing. The push rod structure slides through the transmission component and is circumferentially fixed to the transmission component. The transmission component is provided with a transmission part for meshing with the drive part.

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