Push injection assembly and injection device

Abstract

The utility model discloses a pushing and injecting assembly and an injecting device. The pushing and injecting assembly comprises a supporting component, a torsion piece, a pressing piece, an elastic reset piece, an elastic force storage mechanism, a bias device and a piston rod unit. The supporting component is provided with an injection output end; the torsion piece is provided with a first joint part; the elastic force storage mechanism is used for generating injection driving energy; a piston rod unit installed in the support member and provided with a second engaging portion; the bias device is provided with a bias joint part; the bias device can move between a first working position and a second working position; when the bias device is at the first working position, the bias joint part is separated from the second joint part and is jointed with the first joint part of the torsion part so as to act on the elastic force storage mechanism through the bias device to enable the elastic force storage mechanism to rotate when the torsion part rotates. The piston rod unit is stable and reliable in work, the energy transmission path of the piston rod unit can be shortened, and the energy transmission efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of injection devices, specifically to an injection assembly and an injection device. Background Technology

[0002] Syringes, injection pens, and other injection devices are widely used in the medical industry for drug injection. However, with the development of injection device technology, the functions of injection devices are constantly improving, such as enabling multiple small-dose injections, adjusting the single injection dose, having injection sound output, and display scales.

[0003] Injection devices with dosage adjustment capabilities are favored by the industry because they can meet more drug injection requirements. Among them, the injection assembly, as an important component of the injection device, can generate injection driving energy through an elastic energy storage mechanism to preset the corresponding injection volume. During injection, the injection driving energy of the elastic energy storage mechanism is released and transmitted to the piston rod unit through a corresponding transmission path, so that the piston rod unit can work to perform injection.

[0004] However, some existing injection components are prone to abnormal piston rod unit movement during dosage setting, resulting in poor operational stability. Furthermore, the energy transmission path of the piston rod unit is relatively long, affecting transmission efficiency, thus failing to meet the industry's high requirements. Utility Model Content

[0005] In order to overcome the shortcomings of the prior art, one of the objectives of this utility model is to provide an injection assembly that can avoid abnormal movement of the piston rod unit during dosage setting, is stable and reliable in operation, and can also shorten the energy transmission path of the piston rod unit and improve energy transmission efficiency.

[0006] The second objective of this invention is to provide an injection device that uses the aforementioned push-in assembly. This device avoids abnormal movement of the piston rod unit during dosage setting, ensuring stable and reliable operation. Furthermore, it shortens the energy transmission path of the piston rod unit and improves energy transmission efficiency.

[0007] One of the objectives of this utility model is achieved through the following technical solution:

[0008] An injection assembly includes a support member, a torsion member, a pressing member, an elastic reset member, an elastic energy storage mechanism, an offset device, and a piston rod unit;

[0009] The supporting component is provided with an injection outlet;

[0010] The torsion member is provided with a first joint portion;

[0011] The elastic energy storage mechanism is used to generate injection driving energy;

[0012] The piston rod unit is installed inside the support member and is provided with a second joint.

[0013] The biasing device is provided with a biasing engagement portion; the biasing device is movable between a first working position and a second working position; in the first working position, the biasing engagement portion is separated from the second engagement portion and engages with the first engagement portion of the torsion member to cause the elastic energy storage mechanism to rotate when the torsion member rotates; in the second working position, the biasing engagement portion is separated from the first engagement portion and engages with the second engagement portion of the piston rod unit to transfer the pushing drive energy of the elastic energy storage mechanism to the piston rod unit;

[0014] The pressing element is used to apply a thrust to the biaser as it moves along a direction close to the injection output end, so that the biaser moves to the second working position;

[0015] The elastic reset element is used to provide an elastic force that causes the biaser to reset to the first operating position.

[0016] The elastic energy storage mechanism includes a torsional elastic element and a rotating component. The rotating component is rotatably mounted inside the support member. One end of the torsional elastic element is connected to the rotating component, and the other end is connected to the support member.

[0017] The elastic energy storage mechanism generates injection driving energy during forward rotation. The elastic energy storage mechanism also includes a sound-generating element, which rotates synchronously with the rotating element and is movable relative to the rotating element. The injection assembly also includes a positioning element. The positioning element is movably installed within a support member and has a third engagement portion for engaging with the support member. When the third engagement portion of the positioning element engages with the support member, the positioning element and support member are anti-rotationally engaged, and the positioning element is used to position the sound-generating element. When the biasing device is in a first working position, the third engagement portion of the positioning element engages with the support member. When the biasing device is in a second working position, the third engagement portion of the positioning element separates from the support member. The pressing element applies a thrust to the positioning element and the sound-generating element as it moves along a direction closer to the injection output end, causing the positioning element and the sound-generating element to move along a direction closer to the injection output end, thereby separating the third engagement portion from the support member. The elastic reset element applies an elastic force to the sound-generating element pointing towards the positioning element. The elastic reset element also provides an elastic force that causes the positioning element to reset to engage with the support member at the third engagement portion.

[0018] The positioning element has multiple unidirectional teeth arranged circumferentially, and the sound-generating element has multiple inclined teeth for meshing with the unidirectional teeth of the positioning element.

[0019] The elastic reset member abuts between the rotating member and the sound-generating member; the biasing device is provided with a flange portion for abutting between the positioning member and the sound-generating member; the pressing member is provided with a pushing arm facing the positioning member.

[0020] The sound-generating component is movably mounted outside the biasing device. The sound-generating component has a sound-generating action surface. The biasing device has a biasing action surface that pushes against the sound-generating action surface to make the sound-generating component rotate in the forward direction when the biasing device rotates in the forward direction. When the biasing device is in the second working position, the sound-generating action surface pushes against the biasing action surface to make the biasing device rotate in the reverse direction when the biasing device rotates in the reverse direction.

[0021] The sound-generating component is provided with a sound-generating component guide slope; the biasing device is provided with a biasing guide slope for slidingly engaging with the sound-generating component guide slope and for pushing against the sound-generating component guide slope to displace the sound-generating component and separate it from the positioning component when the biasing device is in the first working position and rotates in the opposite direction.

[0022] The biasing device is provided with a first biasing protrusion and a second biasing protrusion. The biasing action surface is located on one side of the first biasing protrusion, and the other side of the first biasing protrusion forms a biasing stop. The biasing guide slope is formed on the second biasing protrusion. The sound-generating element is provided with a first sound-generating element groove for the first biasing protrusion to be movably embedded in and a second sound-generating element groove for the second biasing protrusion to be embedded in. The groove sidewall of the first sound-generating element groove opposite to the biasing action surface forms the sound-generating element action surface. The groove sidewall of the first sound-emitting element groove, which is opposite to the offset stop, forms the sound-emitting element stop. The groove wall of the second sound-emitting element groove, which is opposite to the offset guide slope, forms the sound-emitting element guide slope. When the sound-emitting element working surface is in contact with the offset working surface, there is a gap between the offset stop and the sound-emitting element stop. When the offset device is in the first working position and rotates in the opposite direction, using the offset guide slope to push against the sound-emitting element guide slope, when the offset stop and the sound-emitting element stop are in contact, the sound-emitting element separates from the positioning element.

[0023] When the bias joint engages with the first joint, the torsion member and the biaser rotate synchronously in cooperation; when the bias joint engages with the second joint, the biaser and the piston rod unit rotate synchronously in cooperation.

[0024] The piston rod unit includes a linkage, a piston rod, and a piston. The linkage is rotatably mounted inside the support member, and the second joint is disposed on the linkage. The piston rod is threadedly connected to the support member, and the piston rod rotates synchronously with the linkage and can move relative to the linkage. The piston is disposed on the piston rod.

[0025] The torsion member is rotatably mounted on the support member, and the elastic energy storage mechanism is located inside the support member; the pressing member is movably mounted on the torsion member.

[0026] The second objective of this utility model is achieved by the following technical solution:

[0027] The injection device includes a dose accumulation component and the aforementioned injection component. The dose accumulation component is disposed between the torsion member and the support member. A drug storage unit is provided on the support member, and the piston rod unit is used to push the drug solution in the drug storage unit toward the injection output end.

[0028] Compared with the prior art, the advantages of this utility model are: it can avoid abnormal movement of the piston rod unit during dosage setting, ensuring stable and reliable operation; it can also shorten the energy transmission path of the piston rod unit and improve energy transmission efficiency; in addition, it is simple and convenient to operate, which is conducive to its promotion. Attached Figure Description

[0029] Figure 1 This is a cross-sectional view of the injection component of this utility model;

[0030] Figure 2 for Figure 1 A magnified view of the upper part;

[0031] Figure 3 This is a cross-sectional view of the injection component of this utility model from another direction;

[0032] Figure 4 This is an exploded view of the injection assembly of this utility model;

[0033] Figure 5 An exploded view of an elastic energy storage mechanism;

[0034] Figure 6 This is a schematic diagram showing the meshing and engagement between the positioning component and the sound-generating component;

[0035] Figure 7 An enlarged view of the engagement between the positioning element and the sound-generating element;

[0036] Figure 8 This is a schematic diagram showing the separation state of the positioning component and the sound-generating component;

[0037] Figure 9 An enlarged view of the separation state of the positioning component and the sound-generating component;

[0038] Figure 10 This is a schematic diagram showing the fit between the scale ring and the supporting components;

[0039] Figure 11 This is a schematic diagram of a torsion component;

[0040] Figure 12 This is a schematic diagram showing the torsion component from another direction.

[0041] Figure 13This is a schematic diagram of the positioning component;

[0042] Figure 14 A schematic diagram of the bias circuit;

[0043] Figure 15 This is a schematic diagram of the sound-generating component;

[0044] Figure 16 A cross-sectional view of the bias circuit;

[0045] Figure 17 This is a sectional view of the pressing component;

[0046] Figure 18 This is a schematic diagram of the linkage component. Detailed Implementation

[0047] 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.

[0048] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the 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, and therefore should not be construed as a limitation of the invention. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0049] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0050] like Figure 1-18As shown, an injection assembly includes a support member 40, a torsion member 13, a pressing member 11, an elastic reset member 34, an elastic energy storage mechanism, an offset device 32, and a piston rod unit.

[0051] The support member 40 is provided with an injection output end 410;

[0052] The torsion member 13 is provided with a first joint portion 134;

[0053] The elastic energy storage mechanism is used to generate injection driving energy;

[0054] The piston rod unit is installed inside the support member 40 and is provided with a second joint 211;

[0055] The biasing device 32 is provided with a biasing engagement portion 324; the biasing device 32 is movable between a first working position and a second working position; in the first working position, the biasing engagement portion 324 is separated from the second engagement portion 211 and engages with the first engagement portion 134 of the torsion member 13 to cause the elastic energy storage mechanism to rotate when the torsion member 13 rotates; in the second working position, the biasing engagement portion 324 is separated from the first engagement portion 134 and engages with the second engagement portion 211 of the piston rod unit to transfer the pushing drive energy of the elastic energy storage mechanism to the piston rod unit.

[0056] The pressing member 11 is used to apply a thrust to the biaser 32 as it moves along the direction close to the injection output end 410, so that the biaser 32 moves to the second working position;

[0057] The elastic reset member 34 is used to provide an elastic force that causes the biaser 32 to reset to the first working position.

[0058] During dosage setting, the bias device 32 is in the first working position. By rotating the torsion member 13 in the forward direction, the bias device 32 acts on the elastic energy storage mechanism, causing the elastic energy storage mechanism to rotate in the forward direction and generating injection driving energy. During injection, by moving the pressing member 11 in the direction close to the injection output end 410, the pressing member 11 applies a thrust to the bias device 32 to move the bias device 32 to the second working position. The injection driving energy released by the elastic energy storage mechanism can be transmitted to the piston rod unit through the bias device 32 to make the piston rod unit work. After injection is completed, the elastic force of the elastic reset member 34 causes the bias device 32 to reset to the first working position. Therefore, during dosage setting, the bias device 32 is located in the first working position, the bias engagement 324 engages with the first engagement 134 of the torsion member 13 and separates from the second engagement 211, so that the bias device 32 acts on the elastic energy storage mechanism, and the transmission between the bias device 32 and the piston rod unit is cut off. This avoids the bias device 32 acting on the piston rod unit, thereby avoiding abnormal movement of the piston rod unit during dosage setting. The operation is stable and reliable. Moreover, during injection, the injection drive energy of the elastic energy storage mechanism is transmitted to the piston rod unit through the bias device 32, which can shorten the injection drive energy transmission path of the piston rod unit and improve efficiency.

[0059] In the first working position, the biasing engagement 324 of the biasing device 32 separates from the second engagement 211 and engages with the first engagement 134 of the torsion member 13 to cause the elastic storage mechanism to rotate when the torsion member 13 rotates. The phrase "causing the elastic storage mechanism to rotate when the torsion member 13 rotates by the biasing device 32 acting on the elastic storage mechanism" can mean that the elastic storage mechanism rotates under the drive of the biasing device 32 when the torsion member 13 rotates, or that the elastic storage mechanism is linked to its own elastic torque and rotates when the torsion member 13 rotates by the biasing device 32 acting on the elastic storage mechanism.

[0060] The elastic energy storage mechanism includes a torsional elastic element 36 and a rotating member 35. The rotating member 35 is rotatably mounted within the support member 40. One end of the torsional elastic element 36 is connected to the rotating member 35, and the other end is connected to the support member 40. When the biasing device 32 is in the first working position, the torsional member 13 is rotated in the forward direction. At this time, the biasing device 32 acts on the elastic energy storage mechanism, causing the rotating member 35 of the elastic energy storage mechanism to rotate in the forward direction. During the forward rotation of the rotating member 35, the torsional elastic element 36 is torsioned in the forward direction, generating elastic torque, thereby generating injection driving energy. When the biasing device 32 is in the second working position, the injection driving energy can be released by the elastic recovery of the torsional elastic element 36. By rotating the rotating member 35 to different rotation amplitudes, the torsional elastic element 36 can be torsioned to different tension states, thereby generating different elastic torques and different injection driving energies. This allows different injection amounts (i.e., dosages) to be set, so that in the subsequent injection process, the corresponding injection driving energy can be transmitted to the piston rod unit, so that the piston rod unit can inject according to the preset dosage under the drive of the corresponding injection driving energy.

[0061] In this embodiment, the torsional elastic element 36 can be an elastic element such as a torsion spring. The forward rotation is clockwise rotation, and the reverse rotation is counterclockwise rotation.

[0062] In this embodiment, the elastic energy storage mechanism is located inside the support member 40.

[0063] The elastic energy storage mechanism generates injection driving energy during forward rotation. The elastic energy storage mechanism also includes a sound-generating element 33, which rotates synchronously with the rotating element 35 and is movable relative to the rotating element 35. The injection assembly also includes a positioning element 15. The positioning element 15 is movably installed within the support member 40, and the positioning element 15 is provided with a third engagement portion 152 for engaging with the support member 40. When the third engagement portion 152 of the positioning element 15 engages with the support member 40, the positioning element 15 engages with the support member 40 in an anti-rotational manner and serves to position the sound-generating element 33. When the biasing device 32 is in the first working position, the positioning element 15's third engagement portion 152... The third engagement 152 engages with the support member 40; when the biasing device 32 is in the second working position, the third engagement 152 of the positioning member 15 separates from the support member 40; the pressing member 11 is used to apply a thrust to the positioning member 15 and the sound-emitting member 33 as it moves in a direction close to the injection output end 410, so that the positioning member 15 and the sound-emitting member 33 move in a direction close to the injection output end 410 to separate the third engagement 152 from the support member 40; the elastic reset member 34 is used to apply an elastic force to the sound-emitting member 33 pointing towards the positioning member 15, and the elastic reset member 34 is also used to provide an elastic force that causes the positioning member 15 to reset to the engagement of the third engagement 152 with the support member 40.During dosage setting, the bias device 32 is in the first working position. By rotating the torsion member 13 in the forward direction, the bias device 32 acts on the elastic energy storage mechanism, causing the rotating member 35 and the sound-emitting member of the elastic energy storage mechanism to rotate in the forward direction. The torsion elastic element 36 generates injection driving energy by rotating the knob in the forward direction. Then, the positioning member 15 positions the sound-emitting member so that the elastic energy storage mechanism is maintained at the corresponding rotation amplitude, and the torsion elastic element 36 is maintained in the corresponding knob state to prevent the torsion elastic element 36 from rotating in the reverse direction and restoring its elasticity, thereby storing the corresponding injection driving energy to set the corresponding dosage. During injection, when the pressing member 11 is pressed and moves along the direction close to the injection output end 410, a thrust is applied to the bias device 32 to move the bias device 32 to the second working position. A thrust is applied to the positioning member 15 and the sound-emitting member to move them along the direction close to the injection output end 410. To separate the third joint 152 from the support member 40, the anti-rotational engagement between the positioning member 15 and the support member 40 is released. At this time, the positioning member 15 can rotate relative to the support member 40, thereby releasing the positioning effect on the elastic energy storage mechanism. The positioning member 15, the sound-emitting member, and the rotating member 35 rotate in opposite directions under the action of the elastic torque of the torsional elastic element 36, and are transmitted to the piston rod unit through the biaser 32, thereby realizing the transmission of the pushing drive energy of the elastic energy storage mechanism to the piston rod unit, and removing the pressing force of the pressing member 11. The elastic reset member 34 applies an elastic force to the sound-emitting member pointing towards the positioning member 15 to reset the engagement state between the sound-emitting member and the positioning member 15, and the elastic force of the elastic reset member 34 causes the biaser 32 to reset to the first working position, causing the positioning member 15 to reset to the elastic force of the engagement between the third joint 152 and the support member 40.

[0064] The synchronous rotational fit refers to the situation where, when one of the objects in the synchronous rotational fit rotates, the other objects in the synchronous rotational fit also rotate.

[0065] The positioning member 15 has multiple unidirectional teeth 151 arranged circumferentially, and the sound-generating member has multiple inclined teeth 331 for meshing with the unidirectional teeth 151 of the positioning member 15. When the biasing device 32 is in the first working position, the third engagement portion 152 of the positioning member 15 engages with the support member 40. By rotating the torsion member 13 in the forward direction, the sound-generating member rotates in the forward direction relative to the positioning member 15 under the drive of the biasing device 32. During the forward rotation of the sound-generating member, the inclined teeth 331 slide along the inclined surfaces of the unidirectional teeth 151. Each time the inclined teeth 331 pass over a unidirectional tooth 151, the inclined teeth 331 move towards the injection output end 410 relative to the unidirectional teeth 151 of the positioning member 15. A brief separation occurs, after which the sound-generating element is pushed towards the positioning element 15 by the elastic reset element 34. The inclined tooth 331 meshes with the next one-way tooth 151, meaning that the sound-generating element rotates one tooth relative to the positioning element 15 in the positive direction. After rotation, the two continue to mesh. The sound is generated by the sliding impact between the inclined tooth 331 and the one-way tooth 151, which can play the role of setting the dosage of the sound-generating element in the positive direction. The positive rotation of the sound-generating element can drive the rotating element 35 to rotate in the positive direction, thereby driving the torsional elastic element 36 to twist and generate the injection driving energy. After the torsion member 13 rotates to its position during the dosage setting period, the torsion elastic element 36 causes the sound-emitting element to tend to rotate in the opposite direction. At this time, the inclined teeth 331 of the sound-emitting element meshes with the one-way teeth 151, and the tendency of the sound-emitting element to rotate in the opposite direction is blocked. Thus, the sound-emitting element can be positioned by the meshing of the one-way teeth 151 of the positioning member 15 with the multiple inclined teeth 331 of the sound-emitting element, so that the sound-emitting element and the rotating member 35 are kept at the corresponding rotation amplitude, and the torsion elastic element 36 is kept in the corresponding knob state to prevent the torsion elastic element 36 from rotating in the opposite direction.

[0066] The one-way tooth 151 of the positioning member 15 can adopt the existing one-way transmission structure, such as having a helical tooth surface and a straight stop surface.

[0067] Of course, in addition to this, the positioning element 15 can also adopt other structures, as long as it can realize the positioning of the sound-emitting element. For example, the positioning element 15 can be a positioning seat with multiple positioning holes, and the sound-emitting element is provided with balls and springs that cooperate with the positioning holes. However, the most preferred embodiment of this utility model is to arrange multiple one-way teeth 151 around the circumference of the positioning element 15, and to provide multiple inclined teeth 331 on the sound-emitting element for meshing with the one-way teeth 151 of the positioning element 15. On the one hand, when the third joint 152 of the positioning element 15 is engaged with the support member 40, the dosage setting period is... When the torsion member 13 is rotated into position, the engagement of the one-way tooth 151 and the inclined tooth 331 ensures stable positioning. On the other hand, during dosage setting, the bias device 32 is in the first working position. When the torsion member 13 is rotated in the forward direction, the bias device 32 acts on the sound-generating element of the elastic energy storage mechanism. The inclined tooth 331 can slide along the inclined surface of the one-way tooth 151 to reach other one-way teeth 151, thereby realizing one-way transmission. The sliding collision between the inclined tooth 331 and the one-way tooth 151 generates sound, which can play the role of sound generation for forward dosage setting. It has the advantages of simple structure and convenient forward adjustment.

[0068] In this embodiment, the positioning element 15 is a ratchet. Of course, other components can also be used, as long as they have multiple unidirectional teeth 151 arranged circumferentially.

[0069] The support member 40 is provided with a support engagement portion for the third engagement portion 152. The third engagement portion 152 consists of a plurality of ratchet teeth arranged circumferentially on the positioning member 15. The support engagement portion includes a plurality of support slots 411 arranged circumferentially on the inner wall of the support member 40 for the ratchet teeth to be inserted into. By having the ratchet teeth inserted one-to-one into the support slots 411, the third engagement portion 152 can be engaged with the support member 40, thereby restricting the rotation of the positioning member 15 relative to the support member 40 and achieving anti-rotational engagement between the positioning member 15 and the support member 40. When the positioning member 15 moves to the point where the ratchet teeth separate from the support slots 411, the positioning member 15 can rotate relative to the support member 40.

[0070] Of course, the third joint 152 can also adopt other structures, as long as it can achieve anti-rotational engagement between the positioning member 15 and the support member 40. For example, the third joint 152 is a plurality of ratchet slots circumferentially arranged on the positioning member 15, and a plurality of support teeth are arranged circumferentially on the inner wall of the support member 40, which are respectively inserted into the plurality of ratchet slots. By inserting the plurality of support teeth into the plurality of ratchet slots respectively, the third joint 152 can be engaged with the support member 40, thereby restricting the rotation of the positioning member 15 relative to the support member 40 and achieving anti-rotational engagement between the positioning member 15 and the support member 40. When the positioning member 15 moves to the point where the ratchet slot and the support teeth are separated, the positioning member 15 can rotate relative to the support member 40.

[0071] The supporting joint is provided with a limiting wall 412 on the side away from the injection output end 410 to block and limit the third joint 152. The positioning member 15 includes a positioning collar 153, the one-way tooth 151 is provided at the bottom of the positioning collar 153, the positioning collar 153 is provided with an outwardly extending convex ring 154, and the ratchet teeth are circumferentially arranged on the convex ring 154.

[0072] In this embodiment, the end of the sound-generating element near the injection output end 410 is located inside the rotating element 35. Specifically, the rotating element 35 is provided with a rotating slot extending along its axial direction, and the sound-generating element is provided with a sound-generating element protrusion 339 that is embedded in the rotating slot and can move along the extension direction of the rotating slot. Through the engagement of the sound-generating element protrusion 339 with the rotating slot, the sound-generating element and the rotating element 35 can rotate synchronously and can move relative to the rotating element 35.

[0073] Of course, in addition, the sound-emitting component is provided with a sound-emitting component slot, and the rotating component 35 may also be provided with a rotating protrusion extending along its axial direction. The rotating protrusion is embedded in the sound-emitting component slot and can move along the extension direction of the sound-emitting component slot, which also allows the sound-emitting component and the rotating component 35 to rotate synchronously and cooperate, and can move relative to the rotating component 35.

[0074] The elastic reset member 34 abuts against the rotating member 35 and the sound-emitting member; the biasing member 32 is provided with a flange portion 325 for abutting against the positioning member 15 and the sound-emitting member; the pressing member 11 is provided with a pushing arm 111 facing the positioning member 15. When the pressing member 11 is pressed and moves along the direction close to the injection output end 410, the pushing force applied to the positioning member 15 by the pushing arm 111 can be transmitted to the biasing member 32 and the sound-emitting member, thereby causing the positioning member 15, the biasing member 32 and the sound-emitting member to move together in the direction close to the injection output end 410 under the pushing force of the positioning member 15, so that the biasing member 32 moves. When the device moves to the second working position, the positioning member 15 moves to the third engagement 152 and separates from the support member 40. At this time, the elastic reset member 34 is compressed as the sound-emitting member moves closer to the injection output end 410. When the pressing force on the pressing member 11 is removed, the elastic reset member 34 elastically elongates. The positioning member 15, the biasing device 32, and the sound-emitting member move together in a direction away from the injection output end 410 under the elastic force of the elastic reset member 34. This causes the sound-emitting member to reset its engagement with the positioning member 15, the biasing device 32 to reset to the first working position, and the positioning member 15 to reset to the third engagement 152 and engage with the support member 40.

[0075] In this embodiment, the elastic reset member 34 may be a spring, an elastic sheet, or the like.

[0076] In this embodiment, the injection assembly further includes a pad 14, which is used to abut against the positioning member 15 and the push arm 111 so that when the pressing member 11 is pressed and moved in a direction close to the injection output end 410, the thrust of the push arm 111 can be indirectly applied to the positioning member 15, the biaser 32 and the sound-emitting member through the pad 14.

[0077] In this embodiment, the torsion member 13 is rotatably mounted on the support member 40, and the pressing member 11 is movably mounted on the torsion member 13. Specifically, the torsion member 13 is provided with an insertion slot 135, and the pushing arm 111 is movably inserted into the insertion slot 135, so that the pressing member 11 can move relative to the torsion member 13, facilitating installation and making the structure more compact. In this embodiment, the extension trajectory of the insertion slot 135 is arc-shaped, and the extension trajectory of the pushing arm 111 matches it.

[0078] Of course, the pressing member 11 can also be mounted on the supporting member 40, as long as it can apply a thrust to the positioning member 15, the biasing device 32 and the sound-emitting member when the pressing member 11 moves in the direction close to the injection output end 410 to achieve its function. However, the most preferred embodiment of this utility model is to movably mount the pressing member 11 on the torsion member 13, which can make the structure compact and reduce the volume.

[0079] The sound-generating element is movably mounted outside the biasing device 32. The sound-generating element has a sound-generating action surface 334. The biasing device 32 has a biasing action surface 323 that pushes against the sound-generating action surface 334 to cause the sound-generating element to rotate in the forward direction when the biasing device 32 rotates forward. When the biasing device 32 is in the second working position, the sound-generating action surface 334 pushes against the biasing action surface 323 to cause the biasing device 32 to rotate in the reverse direction when the biasing device 32 rotates in the reverse direction. During the forward dose setting period, the biasing device 32 is in the first working position. When the torsion member 13 rotates forward, the torsion member 13 drives the biasing device 32 to rotate forward. During the forward rotation of the biasing device 32, the biasing action surface 323 of the biasing device 32 pushes against the sound-generating action surface 334, causing the sound-generating element and the rotating member 35 to rotate forward. This causes the torsional elastic element 36 to rotate with the forward rotation of the rotating member 35, generating elastic torque, thereby generating injection drive energy. During injection, pressing the pressing member 11 moves it towards the injection output end 410, and the pushing force applied by the pressing member 11 moves the positioning member 15, the biasing device 32, and the sound-emitting device together towards the injection output end 410, so that the biasing device 32 moves to the second working position, and the positioning member 15 moves to the third engagement 152 and separates from the support member 40. At this time, the elastic reset member 34 is compressed. Since the third engagement 152 separates from the support member 40, the anti-rotational engagement between the positioning member 15 and the support member 40 is released. At this time, the positioning member 15 can rotate relative to the support member 40, so that the positioning member 15, the sound-emitting device, and the rotating member 35 are in contact with the torsional elastic element 36. Under the action of the torque, the sound-emitting element rotates in the opposite direction. Then, the sound-emitting element's action surface 334 pushes against the biasing action surface 323, causing the biasing device 32 to rotate in the opposite direction. The reverse rotation is transmitted to the piston rod unit through the biasing device 32. Thus, the pushing drive energy of the elastic energy storage mechanism is transmitted to the piston rod unit through the biasing device 32 in a transmission manner. When the pressing force of the pressing member 11 is removed, the positioning member 15, the biasing device 32, and the sound-emitting element move together in a direction away from the injection output end 410 under the action of the elastic force of the elastic reset member 34. This causes the sound-emitting element to reset the engagement state with the positioning member 15, the biasing device 32 to reset to the first working position, and the positioning member 15 to reset to the third joint 152 and engage with the support member 40.

[0080] The sound-generating component is provided with a sound-generating component guide slope 335; the biasing device 32 is provided with a biasing guide slope 326 for slidingly engaging with the sound-generating component guide slope 335 and for pushing against the sound-generating component guide slope 335 to displace the sound-generating component and separate it from the positioning component 15 when the biasing device 32 is in the first working position and rotates in the opposite direction. During dosage setting, the bias device 32 is in the first working position. When the torsion member 13 is rotated in the reverse direction, the torsion member 13 drives the bias device 32 to rotate in the reverse direction. During the reverse rotation of the bias device 32, the sound-emitting element is blocked by the positioning member 15. The bias guide slope 326 of the bias device 32 pushes against the sound-emitting element guide slope 335, causing the sound-emitting element to shift and separate from the positioning member 15. At this time, the positioning function of the positioning member 15 for the sound-emitting element is lost. The sound-emitting element and the rotating member 35 rotate in the opposite direction under the elastic torque of the torsion elastic element 36. Then, under the elastic force of the elastic reset member 34, the sound-emitting element resets to engage with the positioning member 15. In this way, the dosage can be corrected by reverse dosage adjustment. When the sound-emitting element moves to engage with the positioning member 15, the inclined teeth 331 of the sound-emitting element hit the one-way teeth 151 of the positioning member 15 to generate sound, thereby achieving the effect of reverse dosage adjustment sound generation. By providing a sound-generating guide slope 335 on the sound-generating component and a bias guide slope 326 on the biaser 32 that slides in cooperation with the sound-generating guide slope 335, when the forward rotation of the torsion member 13 generates excessive injection driving energy, it can be adjusted in the reverse direction to reduce the injection driving energy. That is, when the amount set in the forward dose setting is too large, the dose can be adjusted in the reverse direction to reduce the set dose, thereby achieving the effect of injection dose correction.

[0081] In this embodiment, the bias guide slope 326 and the sound-generating element guide slope 335 are inclined in the opposite direction away from the injection output end 410. The inclination of the bias guide slope 326 and the sound-generating element guide slope 335 are the same. The sound-generating element action surface 334 and the bias action surface 323 are arranged in a vertical plane.

[0082] Of course, the bias guide slope 326, the sound-generating guide slope 335, the sound-generating action surface 334, and the bias action surface 323 are not limited to these. Their shapes and sizes can be set according to actual needs, as long as they can meet their functional requirements.

[0083] Further optimized, the biasing device 32 is provided with a first biasing protrusion 327 and a second biasing protrusion 328. The biasing action surface 323 is provided on one side of the first biasing protrusion 327, and the other side of the first biasing protrusion 327 is formed as a biasing stop 322. The biasing guide slope 326 is formed on the second biasing protrusion 328. The sound-emitting element is provided with a first sound-emitting element groove 336 for the first biasing protrusion 327 to be movably embedded in and a second sound-emitting element groove 337 for the second biasing protrusion 328 to be embedded in. The groove sidewall of the first sound-emitting element groove 336 opposite to the biasing action surface 323 is formed as the sound-emitting element action surface 328. 34. The groove sidewall of the first sound-emitting element groove 336 opposite to the offset stop 322 is formed as the sound-emitting element stop 333, and the groove wall of the second sound-emitting element groove 337 corresponding to the offset guide slope 326 is formed as the sound-emitting element guide slope 335. When the sound-emitting element working surface 334 and the offset working surface 323 are in contact, there is a gap between the offset stop 322 and the sound-emitting element stop 333. When the biaser 32 is in the first working position and rotates in the opposite direction, and pushes the sound-emitting element guide slope 335 with the offset guide slope 326, when the offset stop 322 and the sound-emitting element stop 333 are in contact, the sound-emitting element and the positioning element 15 are separated. During dosage setting, the bias device 32 is in the first working position. When the torsion member 13 is rotated in the reverse direction, the torsion member 13 drives the bias device 32 to rotate in the reverse direction. During the reverse rotation of the bias device 32, the bias guide ramp 326 of the bias device 32 pushes against the sound-generating member guide ramp 335. The sound-generating member has a tendency to move in two directions: reverse rotation and movement towards the injection output end 410. However, the ramp teeth 331 of the sound-generating member are engaged with the one-way teeth 151 at this time, and the reverse rotation is blocked by the positioning member 15. The sound-generating member can only move towards the injection output end 410. At this time, the sound-generating member generates displacement towards the injection output end 410, which compresses the elastic reset member 34. When the bias device 32 rotates in the reverse direction to the bias stop position... When 322 is engaged with the stop position 333 of the sound-emitting component, the sound-emitting component moves until the inclined tooth 331 and the one-way tooth 151 are completely disengaged. At this time, the sound-emitting component disengages from the positioning component 15. Since the sound-emitting component loses the positioning function of the positioning component 15, it begins to rotate in the opposite direction under the elastic torque of the torsional elastic element 36. The bias guide inclined surface 326 of the biaser 32 disengages from the sound-emitting component guide inclined surface 335 of the sound-emitting component. There is an axial gap between the biaser 32 and the sound-emitting component. The elastic reset component 34 pushes the sound-emitting component to move toward the positioning component 15. The sound-emitting component and the positioning component 15 return to the meshing state. In this embodiment, the sound-emitting component rotates in the opposite direction relative to the positioning component 15 by a distance of one one-way tooth 151 each time. After the rotation, the two continue to mesh.Each time the sound-generating component rotates one tooth, it separates from the positioning component 15 once, and then the two re-engage. This achieves the reverse setting of the dosage in the above manner. When the torsion component 13 rotates in the forward direction, it generates the injection driving energy, and when the torsion component 13 rotates in the reverse direction, it releases the injection driving energy to reduce the set dosage and achieve the effect of injection dosage correction.

[0084] The biasing device 32 has at least two first biasing protrusions 327 and at least two second biasing protrusions 328 arranged alternately and at intervals along its circumference on its outer side wall. The inner side of the main body of the sound-emitting component has at least two first sound-emitting component grooves 336 corresponding to the at least two first biasing protrusions 327 and at least two second sound-emitting component grooves 337 corresponding to the at least two second biasing protrusions 328.

[0085] In this embodiment, the first bias protrusion 327 is rectangular, and both the first bias protrusion 327 and the second bias protrusion 328 are provided in pairs.

[0086] The shape and number of the first biased protrusion 327 and the second biased protrusion 328 can be set according to actual needs. The first sound-emitting element groove 336 and the second sound-emitting element groove 337 are correspondingly provided.

[0087] Specifically, the biasing device 32 includes a biasing main cylinder, with a first biasing protrusion 327 and a second biasing protrusion 328 formed on the outer wall of the biasing main cylinder. The flange 325 is located on the side of the first biasing protrusion 327 and the second biasing protrusion 328 away from the injection output end 410. The sound-generating element includes a sound-generating element main cylinder, with the first sound-generating element groove 336 and the second sound-generating element groove 337 correspondingly located on the inner side of the sound-generating element main cylinder. The inclined tooth 331 is located at the end of the sound-generating element main cylinder away from the injection output end 410, thus facilitating processing. The rotating element 35 is provided with a stroke groove extending along its axial direction, and the sound-generating element is provided with an anti-disengagement hook that movably engages with the stroke groove. When the sound-generating element moves relative to the rotating element 35, the anti-disengagement hook moves along the stroke groove. The groove wall at the end of the stroke groove away from the injection output end 410 can act as a limit, preventing the anti-disengagement hook from disengaging, thereby preventing the sound-generating element from separating from the rotating element 35.

[0088] Specifically, when the biasing joint 324 engages with the first joint 134, the torsion member 13 and the biaser 32 rotate synchronously in cooperation; when the biasing joint 324 engages with the second joint 211, the biaser 32 and the piston rod unit rotate synchronously in cooperation.

[0089] In this embodiment, the bias engagement portion 324 includes a first bias insert and a second bias insert, the first engagement portion 134 includes a plurality of first engagement slots for the plurality of first bias inserts to be inserted into the first engagement portion, and the second engagement portion 211 includes a plurality of second engagement slots for the plurality of second bias inserts to be inserted into the second engagement portion. Thus, when the first bias insert is engaged with the plurality of first engagement slots of the first engagement portion 134, the biaser 32 is rotated with the torsion member 13. When the second bias insert is engaged with the plurality of second engagement slots of the second engagement portion 211, the biaser 32 is rotated synchronously with the piston rod unit.

[0090] Of course, in addition to these, the bias joint 324, the first joint 134, and the second joint 211 can also adopt other structures. For example, the bias joint 324 can be a plurality of bias slots arranged in a circle, and the first joint 134 and the second joint 211 can each include a plurality of engagement teeth for being respectively inserted into the plurality of bias slots, which can also realize the synchronous rotational engagement of the biaser 32 with the torsion member 13 and the piston rod unit.

[0091] The piston rod unit includes a linkage 21, a piston rod 22, and a piston 24. The linkage 21 is rotatably mounted inside the support member 40, and the second joint 211 is disposed on the linkage 21. The piston rod 22 is threadedly connected to the support member 40, and the piston rod 22 rotates synchronously with the linkage 21 and can move relative to the linkage 21. The piston 24 is disposed on the piston rod 22. When the offset device 32 drives the linkage 21 to rotate, the piston rod 22 rotates under the drive of the linkage 21 and spirals forward under the action of the thread of the support member 40, thereby allowing the piston to push the injection. The inner circumference of the support member 40 is provided with multiple unidirectional sound-emitting teeth. The linkage 21 is provided with an elastic arm 212, and the elastic arm 212 is provided with mating sound-emitting teeth 213 that mesh with the unidirectional sound-emitting teeth. When the linkage 21 rotates, the mating sound-emitting teeth 213 slide and collide with the unidirectional sound-emitting teeth in sequence to generate sound, which can play the role of pushing the injection and generating sound.

[0092] The injection assembly also includes a graduated ring 37, which is movably mounted on the rotating member 35 and threadedly connected to the support member 40. A window is provided on the support member 40 corresponding to the graduated ring 37. When the rotating member 35 rotates, the graduated ring 37 is guided by the thread of the support member 40 to move in a spiral motion under the action of the rotating member 35. The window on the support member 40 allows observation of the set scale value (not shown) on the graduated ring 37. The support member 40 is provided with an initial stop and a stop 415, which are sequentially arranged along the direction away from the injection output end 410. In the initial state, the graduated ring 37 is engaged with the initial stop, preventing the graduated ring 37, rotating member 35, and sound-emitting member 33 from rotating in the opposite direction. During dose setting, the graduated ring 37 moves to the stop 415 and engages, preventing the dose value from being increased, thus improving safety.

[0093] The torsion member 13 includes a pressure cap 136 and a central column 137 disposed on the pressure cap 136. The pressure cap 136 is rotatably mounted on the support member 40. The first joint 134 is disposed on the central column 137. The central column 137 is located on the side of the linkage 21 away from the injection output end 410. The biasing device 32 can slide axially onto the central column 137 and the linkage 21 to be movable to a first working position and a second working position.

[0094] In this embodiment, the piston rod unit passes through the inner side of the rotating member 35, and the central column 137 passes through the inner side of the positioning member 15.

[0095] The support member 40 may include a housing, a torsion spring seat 38 disposed within the housing, a fixed seat 31 disposed within the housing, and a guide seat 23 disposed within the housing; the support joint may be formed on the fixed seat 31, the torsion spring is connected to the torsion spring seat 38, and a one-way sound-emitting tooth is disposed on the torsion spring seat 38; the piston rod is threadedly connected to the guide seat 23.

[0096] Of course, in addition to this, the support member 40 can also be set according to actual needs, but the most preferred embodiment of this utility model is to use a combination of a shell, a torsion spring seat 38 and a fixed seat 31 for the support member 40, which can facilitate processing.

[0097] The actual dosage setting process of the injection assembly of this utility model is as follows: Rotate the torsion member 13. The torsion member 13 engages with the bias engagement 324 of the biaser 32 through the first engagement 134. The torsion member 13 drives the biaser 32, the sound-emitting member 33, the rotating member 35, and the scale ring 37 to rotate. The scale ring 37 is guided by the thread of the support member 40 to move spirally. One end of the torsional elastic element 36 is connected to the rotating member 35, and the other end is fixed by the support member 40. When the rotating member 35 rotates in the forward direction, it drives the torsional elastic element 36 to twist and generate injection driving energy.

[0098] The actual injection process of the injection assembly of this utility model is as follows: Press the pressing member 11, and the pressing member 11 pushes the pad 14, positioning member 15, biasing device 32, and sound-emitting device 33 to move towards the injection output end 410. The biasing engagement part 324 of the biasing device 32 engages with the second engagement part 211 of the piston rod unit. The biasing engagement part 324 of the biasing device 32 disengages from the first engagement part 134 of the torsion member 13. Continue to press the pressing member 11 until the third engagement part 152 of the positioning member 15 disengages from the fixed seat 31. At this time, the torsion elastic element 36 releases the injection driving energy, which drives the rotating member 35, scale ring 37, sound-emitting device 33, biasing device 32, positioning member 15, linkage member 21, and piston rod 22 to rotate. The scale ring 37 is guided to move and reset by the thread of the support member 40, and the piston rod 22 is guided to move by the thread of the support member 40 to perform the injection operation.

[0099] This utility model also discloses an injection device, including a dose accumulation component and the above-mentioned injection component. The dose accumulation component is disposed between the torsion member 13 and the support member 40. A drug storage unit 60 is provided on the support member 40, and the piston rod unit is used to push the drug liquid in the drug storage unit 60 toward the injection output end 410.

[0100] In this embodiment, the injection output end 410 may be equipped with an injection needle 70. The drug storage unit 60 includes a drug reservoir and a drug bottle 50 disposed within the drug reservoir. Of course, the drug storage unit 60 can also be configured in other ways, as long as it can store drugs.

[0101] Specifically, the dose accumulation component includes a worm gear 12 rotatably mounted on the torsion member 13 and a spiral track 416 disposed on the support member 40, wherein the worm gear 12 meshes with the spiral track 416. During dose setting, the torsion member 13 is rotated, and the worm gear 12 rotates under the drive of the torsion member 13 and the spiral track 416. Thus, the total number of rotations of the worm gear 12 reflects the total number of rotations of the torsion member 13 for all injections. The worm gear 12 is also provided with a worm gear 12 stop. In this embodiment, the torsion member 13 drives the worm gear 12 to rotate. One rotation of the torsion member 13 corresponds to one tooth rotation of the worm gear 12. When the dose reaches the maximum value, the torsion member 13 engages with the worm gear 12 stop and cannot rotate. At this time, dose setting cannot be performed. Therefore, the dose accumulation component can limit the total maximum injection volume for all injections, ensuring safety during use.

[0102] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. A dispensing assembly, characterized in that, Includes support components, torsion components, pressing components, elastic reset components, elastic energy storage mechanisms, offset devices, and piston rod units; The supporting component is provided with an injection outlet; The torsion member is provided with a first joint portion; The elastic energy storage mechanism is used to generate injection driving energy; The piston rod unit is installed inside the support member and is provided with a second joint. The biasing device is provided with a biasing engagement portion; the biasing device is movable between a first working position and a second working position; in the first working position, the biasing engagement portion is separated from the second engagement portion and engages with the first engagement portion of the torsion member to cause the elastic energy storage mechanism to rotate when the torsion member rotates; in the second working position, the biasing engagement portion is separated from the first engagement portion and engages with the second engagement portion of the piston rod unit to transfer the pushing drive energy of the elastic energy storage mechanism to the piston rod unit; The pressing element is used to apply a thrust to the biaser as it moves along a direction close to the injection output end, so that the biaser moves to the second working position; The elastic reset element is used to provide an elastic force that causes the biaser to reset to the first operating position.

2. The injection assembly according to claim 1, characterized in that, The elastic energy storage mechanism includes a torsional elastic element and a rotating component. The rotating component is rotatably mounted inside the support member. One end of the torsional elastic element is connected to the rotating component, and the other end is connected to the support member.

3. The injection assembly according to claim 2, characterized in that, The elastic energy storage mechanism generates injection driving energy during forward rotation. The elastic energy storage mechanism also includes a sound-generating element, which rotates synchronously with the rotating element and is movable relative to the rotating element. The injection assembly also includes a positioning element. The positioning element is movably installed within a support member and has a third engagement portion for engaging with the support member. When the third engagement portion of the positioning element engages with the support member, the positioning element and support member are anti-rotationally engaged, and the positioning element is used to position the sound-generating element. When the biasing device is in a first working position, the third engagement portion of the positioning element engages with the support member. When the biasing device is in a second working position, the third engagement portion of the positioning element separates from the support member. The pressing element applies a thrust to the positioning element and the sound-generating element as it moves along a direction closer to the injection output end, causing the positioning element and the sound-generating element to move along a direction closer to the injection output end, thereby separating the third engagement portion from the support member. The elastic reset element applies an elastic force to the sound-generating element pointing towards the positioning element. The elastic reset element also provides an elastic force that causes the positioning element to reset to engage with the support member at the third engagement portion.

4. The injection assembly according to claim 3, characterized in that, The positioning element has multiple unidirectional teeth arranged circumferentially, and the sound-generating element has multiple inclined teeth for meshing with the unidirectional teeth of the positioning element.

5. The injection assembly according to claim 4, characterized in that, The elastic reset member abuts between the rotating member and the sound-generating member; the biasing device is provided with a flange portion for abutting between the positioning member and the sound-generating member; the pressing member is provided with a pushing arm facing the positioning member.

6. The injection assembly according to claim 5, characterized in that, The sound-generating component is movably mounted outside the biasing device. The sound-generating component has a sound-generating action surface. The biasing device has a biasing action surface that pushes against the sound-generating action surface to make the sound-generating component rotate in the forward direction when the biasing device rotates in the forward direction. When the biasing device is in the second working position, the sound-generating action surface pushes against the biasing action surface to make the biasing device rotate in the reverse direction when the biasing device rotates in the reverse direction.

7. The injection assembly according to claim 6, characterized in that, The sound-generating component is provided with a sound-generating component guide slope; the biasing device is provided with a biasing guide slope for slidingly engaging with the sound-generating component guide slope and for pushing against the sound-generating component guide slope to displace the sound-generating component and separate it from the positioning component when the biasing device is in the first working position and rotates in the opposite direction.

8. The injection assembly according to claim 7, characterized in that, The biasing device is provided with a first biasing protrusion and a second biasing protrusion. The biasing action surface is located on one side of the first biasing protrusion, and the other side of the first biasing protrusion forms a biasing stop. The biasing guide slope is formed on the second biasing protrusion. The sound-generating element is provided with a first sound-generating element groove for the first biasing protrusion to be movably embedded in and a second sound-generating element groove for the second biasing protrusion to be embedded in. The groove sidewall of the first sound-generating element groove opposite to the biasing action surface forms the sound-generating element action surface. The groove sidewall of the first sound-emitting element groove, which is opposite to the offset stop, forms the sound-emitting element stop. The groove wall of the second sound-emitting element groove, which is opposite to the offset guide slope, forms the sound-emitting element guide slope. When the sound-emitting element working surface is in contact with the offset working surface, there is a gap between the offset stop and the sound-emitting element stop. When the offset device is in the first working position and rotates in the opposite direction, using the offset guide slope to push against the sound-emitting element guide slope, when the offset stop and the sound-emitting element stop are in contact, the sound-emitting element separates from the positioning element.

9. The injection assembly according to claim 1, characterized in that, When the bias joint engages with the first joint, the torsion member and the biaser rotate synchronously in cooperation; when the bias joint engages with the second joint, the biaser and the piston rod unit rotate synchronously in cooperation.

10. The injection assembly according to claim 1, characterized in that, The piston rod unit includes a linkage, a piston rod, and a piston. The linkage is rotatably mounted inside the support member, and the second joint is disposed on the linkage. The piston rod is threadedly connected to the support member, and the piston rod rotates synchronously with the linkage and can move relative to the linkage. The piston is disposed on the piston rod.

11. The injection assembly according to claim 1, characterized in that, The torsion member is rotatably mounted on the support member, and the elastic energy storage mechanism is located inside the support member; the pressing member is movably mounted on the torsion member.

12. An injection device, characterized in that, It includes a dose accumulation component and an injection component as described in any one of claims 1-11, wherein the dose accumulation component is disposed between a torsion member and a support member; a drug storage unit is provided on the support member, and the piston rod unit is used to push the drug solution in the drug storage unit toward the injection output end.

Images