Clutch assembly, dosage setting apparatus, and injection apparatus

Abstract

Provided are a clutch assembly, a dosage setting apparatus, and an injection apparatus. The clutch assembly has an engaged state and a disengaged state. The clutch assembly comprises a knob (1), a ratchet (2), a bias device (3), a sound generation sheet (4), an elastic member (5), and a scale rod (6), wherein one side of the ratchet (2) facing away from the knob (1) is provided with ratchet teeth (21); the bias device (3) is configured to be linked with the knob (1), and comprises a main body (31) and a connecting platform (32) disposed at one end of the main body (31), the connecting platform (32) being provided with a first inclined surface (321); one end of the sound generation sheet (4) in an axial direction is provided with helical teeth (41), the helical teeth (41) being engaged with the ratchet teeth (21); the sound generation sheet (4) is further provided with a second inclined surface (42), the second inclined surface (42) being disposed on the inner side of the helical teeth (41), and the second inclined surface (42) being attached to the first inclined surface (321); the elastic member (5) is disposed between the sound generation sheet (4) and the scale rod (6); and the scale rod (6) is linked with the sound generation sheet (4). The sound generation sheet (4) and the ratchet (2) have an engaged state in which they are engaged with each other and a disengaged state in which they are disengaged from each other. The engagement and disengagement between the ratchet (2) and the sound generation sheet (4) of the clutch assembly and the injection apparatus are stable, the power transmission efficiency is high, and the dosage setting is independent of the push-injection clutch, avoiding mutual interference.

Description

A clutch assembly, a dosage setting device, and an injection device Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a clutch assembly, a dosage setting device, and an injection device. Background Technology

[0002] With the development of injection device technology, the current requirements for injection devices include the ability to administer multiple small-dose injections, easy adjustment of the single injection dose, visual calibration during dose adjustment, simple operation during injection, and the injection pen emitting a sound during the injection process to indicate that the injection is in progress.

[0003] Currently, some injection devices allow users to set the injection dosage. When the dosage needs to be corrected, it can be adjusted through the clutch component. However, the current clutch component is inconvenient to use, and the engagement and disengagement are unstable, making it difficult to adjust the dosage.

[0004] Some injection devices use clutch components for disengagement, but they are inconvenient to use and unstable in operation, which falls far short of meeting the high requirements of the industry. Summary of the Invention

[0005] To overcome the shortcomings of the prior art, one of the objectives of this invention is to provide a clutch assembly that is easy to use and avoids all or some of the aforementioned defects. The technical solution adopted is as follows:

[0006] A clutch assembly having an engaged state and an disengaged state.

[0007] The clutch assembly includes a knob, a ratchet, an offset device, a sound-emitting plate, an elastic element, and a scale lever;

[0008] The ratchet has ratchet teeth on the side opposite to the knob;

[0009] The biasing device is used to link with the knob and includes a main body and a connecting platform provided at one end of the main body. The connecting platform is provided with a first inclined surface.

[0010] One end of the sound-generating plate in the axial direction is provided with helical teeth, which mesh with the ratchet teeth; the sound-generating plate is also provided with a second inclined surface, which is located inside the helical teeth and fits against the first inclined surface;

[0011] The elastic element is disposed between the sound-emitting plate and the scale rod;

[0012] The scale rod is linked to the sound-emitting plate;

[0013] The sound-producing plate and the ratchet have an engaged state and a disengaged state. Initially, the elastic element is in a compressed state, and the sound-producing plate is pushed by the elastic element, causing the helical teeth to engage with the ratchet teeth, which is the engaged state. When the knob is rotated in the first direction, the first inclined surface of the biasing device presses against the second inclined surface of the sound-producing plate, causing the sound-producing plate to move axially and press against the elastic element. The helical teeth disengage from the ratchet teeth, thereby causing the ratchet to disengage from the sound-producing plate, which is the disengaged state.

[0014] The connecting platform is also provided with a plurality of protrusions arranged at intervals, and the plurality of protrusions form a stop position; the sound-emitting plate is also provided with a plurality of abutment posts arranged at intervals, the abutment posts being coaxially arranged with the second inclined surface, and the abutment posts being located within the stop position.

[0015] The knob is a housing with one end open. A protrusion is provided on the end face of the housing opposite to the opening along the axial direction. A receiving space is formed between the protrusion and the housing. A connecting key is provided on the outer wall of the protrusion.

[0016] The outer wall of the knob is also provided with a threaded structure.

[0017] The main body is a hollow cylinder, and a connecting groove is provided on the inner wall of the main body. The connecting groove is used to connect with the connecting keyway.

[0018] The external dimensions of the protrusion are smaller than the inner diameter of the body, and part of the protrusion extends into the body.

[0019] The ratchet is hollow in the middle, and the protrusion passes through the middle of the ratchet, with the ratchet housed within the receiving space.

[0020] The other end of the sound-emitting sheet is hollow to form a second receiving space, and part of the elastic element is received in the second receiving space.

[0021] The elastic element is a spring.

[0022] The sound-emitting plate is provided with an elastic reset part, and the biasing device is provided with a top abutting part. The elastic reset part is used to abut against the top abutting part.

[0023] To overcome the shortcomings of the prior art, the second objective of this invention is to provide a dosage setting device that employs a clutch assembly. This device is easy to use; simply rotating a knob allows for dosage setting and reversal. The clutch assembly utilizes a one-way gear that engages with a ramp structure for rotation. During forward dosage setting, the one-way gears slide; during reversal, the ramps slide, resulting in stable movement and clear feedback. This avoids all or some of the aforementioned defects. The technical solution is as follows:

[0024] A dosage setting device includes a knob, a housing, a clutch assembly, a dosage range setting element, a scale rod, an energy storage element, and a mounting base;

[0025] The knob can rotate in both directions and is used to coordinate with the clutch assembly;

[0026] The outer casing is hollow inside, and is used to accommodate the clutch assembly, the dosage setting element, the scale rod, the energy storage device, and the mounting base;

[0027] The clutch assembly has an engaged state and a disengaged state;

[0028] The dosage range setting element is linked to the scale lever to limit the range of rotation of the knob;

[0029] The scale rod is linked to the clutch assembly and is used to store energy in the energy storage device;

[0030] One end of the energy storage device is connected to the scale rod, and the other end is fixed to the mounting base;

[0031] When the clutch assembly is engaged, the knob rotates in the first direction, and the energy storage element stores energy; when the knob rotates in the second direction, the clutch assembly switches between the engaged and disengaged states, and the energy storage element releases energy.

[0032] The clutch assembly includes a ratchet, a biasing device, a sound-emitting plate, and an elastic element;

[0033] The ratchet has ratchet teeth on the side opposite to the knob;

[0034] The biasing device is used to link with the knob and includes a main body and a connecting platform provided at one end of the main body. The connecting platform is provided with a first inclined surface.

[0035] One end of the sound-generating plate in the axial direction is provided with helical teeth, which mesh with the ratchet teeth; the sound-generating plate is also provided with a second inclined surface, which is located inside the helical teeth and fits against the first inclined surface;

[0036] The elastic element is disposed between the sound-emitting plate and the scale rod;

[0037] The scale rod is linked to the sound-emitting plate;

[0038] The sound-producing plate and the ratchet have an engaged state and a disengaged state. Initially, the elastic element is in a compressed state, and the sound-producing plate is pushed by the elastic element, causing the helical teeth to engage with the ratchet teeth, which is the engaged state. When the knob is rotated in the second direction, the first inclined surface of the biasing device presses against the second inclined surface of the sound-producing plate, causing the sound-producing plate to move axially and press against the elastic element. The helical teeth disengage from the ratchet teeth, thereby causing the ratchet to disengage from the sound-producing plate, which is the disengaged state.

[0039] The connecting platform is also provided with a plurality of protrusions arranged at intervals, and the plurality of protrusions form a stop position; the sound-emitting plate is also provided with a plurality of abutment posts arranged at intervals, the abutment posts being coaxially arranged with the second inclined surface, and the abutment posts being located within the stop position.

[0040] The knob is a housing with one end open. A protrusion is provided on the end face of the housing opposite to the opening along the axial direction. A receiving space is formed between the protrusion and the housing. A connecting key is provided on the outer wall of the protrusion.

[0041] The main body is a hollow cylinder, and a connecting groove is provided on the inner wall of the main body. The connecting groove is used to connect with the connecting keyway.

[0042] The ratchet is hollow in the middle, and the protrusion passes through the middle of the ratchet, with the ratchet housed within the receiving space.

[0043] The dosage range setting element includes a fixed base and a scale ring. Both the fixed base and the scale ring are sleeved outside the scale rod. The ratchet is connected to the fixed base by teeth. The inner wall of the scale ring is connected to the keyway of the scale rod. The outer wall of the scale ring is threaded to the outer shell.

[0044] The outer wall of the mounting base is provided with a first stop protrusion, and the end of the scale ring opposite to the mounting base is provided with a second stop protrusion. When the first stop protrusion and the second stop protrusion are in contact, the scale ring cannot rotate relative to the mounting base in the second direction.

[0045] The fixed base has a third stop protrusion on the end opposite to the scale ring, and the scale ring has a fourth stop protrusion on the end opposite to the fixed base. When the knob is rotated in the first direction, the scale ring is driven to rotate by the scale rod until the fourth stop protrusion abuts against the third stop protrusion. At this time, the scale ring can no longer rotate in the first direction.

[0046] The inner wall of the outer casing is provided with a first thread, and the outer wall of the scale ring is provided with a matching second thread; the outer casing is also provided with a scale window, and the outer wall of the scale ring is provided with scale marks, the scale marks corresponding to the scale window.

[0047] To overcome the shortcomings of the prior art, the third objective of this invention is to provide an injection device that employs the aforementioned dosage setting device. This device is convenient to use; dosage setting and reversal can be achieved simply by rotating a knob. The device utilizes a clutch assembly with one-way teeth engaging with a ramp structure for rotation. During dosage setting, the one-way teeth slide; during dosage setting reversal, the ramps slide, resulting in stable movement and clear feedback. This avoids all or some of the aforementioned defects. The technical solution is as follows:

[0048] An injection device comprising the dosage setting device described above.

[0049] To overcome the shortcomings of the prior art, the fourth objective of this invention is to provide an injection device that is stable in movement, provides clear feedback, and is easy to use, avoiding all or some of the aforementioned defects. The device employs the following technical solution:

[0050] Injection device, including:

[0051] Transmission mechanism, rotary feed assembly, and power source;

[0052] The transmission mechanism includes:

[0053] Actuator, drive sleeve and transmission assembly;

[0054] The transmission assembly is connected to the drive sleeve via a circumferential guiding structure;

[0055] When the actuator is pressed, the transmission assembly, under the thrust of the actuator, can generate a circumferential displacement relative to the drive sleeve by means of the circumferential guiding structure.

[0056] The drive sleeve is connected to the power source in a transmission connection;

[0057] The power source is used to set the driving force during dose setting and to provide power to the rotary feed assembly using the driving force during injection;

[0058] The rotary feed assembly includes a rotary cylinder and a screw;

[0059] The transmission assembly is slidably sleeved on the outside of the rotating cylinder;

[0060] When the actuator is pressed, it first pushes the transmission assembly to move axially until an anti-rotation connection is established between the transmission assembly and the rotating cylinder. Then, with the help of the circumferential guiding structure and under the thrust of the actuator, the transmission assembly generates the circumferential displacement relative to the drive sleeve.

[0061] The circumferential displacement causes the rotating cylinder to rotate in the same direction, and the rotation of the rotating cylinder in the same direction drives the screw to feed axially.

[0062] The injection device also includes a ratchet assembly, a dosage knob, and a torsion spring; the transmission assembly includes a sound-emitting tube; the distal end of the sound-emitting tube is provided with a first one-way ratchet, and the proximal end of the ratchet assembly is provided with a second one-way ratchet; the injection device also includes a return spring; the return spring is used to push the sound-emitting tube so that the first one-way ratchet on the sound-emitting tube is elastically engaged with the second one-way ratchet on the ratchet assembly; when the dosage knob is rotated in the first direction, the sound-emitting tube rotates relative to the ratchet assembly in the first direction, driving the drive sleeve to rotate in the first direction to store energy in the torsion spring.

[0063] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0064] (1) The clutch assembly has both engagement and disengagement states, making it easy to use. By properly setting the clutch assembly, engagement and disengagement are stable, reversal is convenient, power transmission efficiency is high, and dosage setting and injection clutch are independent, avoiding mutual interference.

[0065] (2) The dosage setting device uses a clutch assembly, which is easy to use. The dosage setting and reversal can be achieved by rotating the knob. The one-way teeth of the clutch assembly cooperate with the inclined structure to rotate. When the dosage setting is adjusted forward, the one-way teeth slide between them. When the dosage setting is reversed, the inclined surfaces slide between them. The movement is stable and the feedback is obvious.

[0066] (3) By employing an actuator, a drive sleeve, and a transmission assembly; the transmission assembly is connected to the drive sleeve via a circumferential guiding structure. When the actuator is pressed, the transmission assembly can generate a circumferential displacement relative to the drive sleeve under the thrust of the actuator, thanks to the circumferential guiding structure. Thus, when the user presses the actuator to inject, the transmission mechanism can convert the force of the user pressing the actuator into a circumferential displacement of the transmission assembly relative to the drive sleeve. This circumferential displacement compensates for the problem of transmission attenuation and improves the problem of attenuation in the transmission of the rotation angle of the drive sleeve to the rotating cylinder caused by manufacturing errors, assembly errors, and movement gaps, thereby achieving injection dose compensation. Attached Figure Description

[0067] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0068] Figure 1 is an exploded structural diagram of the clutch assembly of the present invention;

[0069] Figure 2 is a schematic diagram of the knob;

[0070] Figure 3 is a schematic diagram of the ratchet structure;

[0071] Figure 4 is a schematic diagram of the bias device;

[0072] Figure 5 is a cross-sectional view of the biaser;

[0073] Figure 6 is a schematic diagram of the sound-generating plate;

[0074] Figure 7 is a schematic diagram of the clutch assembly in the engaged state;

[0075] Figure 8 is a partial enlarged view of part A in Figure 7;

[0076] Figure 9 is a schematic diagram of the clutch assembly in the disengaged state;

[0077] Figure 10 is a partial enlarged view of part B in Figure 9;

[0078] Figure 11 is an exploded structural diagram of the dosage setting device of the present invention;

[0079] Figure 12 is a schematic diagram of the dosage setting device of the present invention when it is located at the minimum end of the dosage range;

[0080] Figure 13 is a schematic diagram of the dosage setting device of the present invention when it is located at the maximum end of the dosage range;

[0081] Figure 14 is a schematic diagram of the scale rod;

[0082] Figure 15 is a schematic diagram of the mounting base;

[0083] Figure 16 is a structural schematic diagram of the outer shell from a first-view perspective;

[0084] Figure 17 is a structural schematic diagram of the outer shell from a second perspective;

[0085] Figure 18 is a structural schematic diagram of the fixed base;

[0086] Figure 19 is a structural schematic diagram of the scale ring from a first-view perspective;

[0087] Figure 20 is a structural schematic diagram of the scale ring from a second perspective;

[0088] Figure 21 is a schematic diagram of the transmission device, which also shows the structure of the syringe reset mechanism;

[0089] Figure 22 is a perspective view of the transmission device, which also shows the structure of the syringe reset mechanism;

[0090] Figure 23 is an exploded view of the transmission device, which also shows the structure of the syringe's reset mechanism;

[0091] Figure 24 is a schematic diagram of the engagement state between the transmission component and the ratchet when the linkage component rotates in the first direction;

[0092] Figure 25 is a schematic diagram of the engagement state between the elastic part and the top when the linkage component rotates in the first direction;

[0093] Figure 26 is a structural schematic diagram of the transmission component;

[0094] Figure 27 is a schematic diagram of the transmission component from another direction;

[0095] Figure 28 is a structural schematic diagram of the linkage component;

[0096] Figure 29 is a schematic diagram of the linkage component from another direction;

[0097] Figure 30 is a schematic diagram of the linkage component and the rotating component;

[0098] Figure 31 is a schematic diagram showing that the first toothed unit and the second toothed unit are not engaged;

[0099] Figure 32 is a schematic diagram of the engagement state of the first toothed unit and the second toothed unit;

[0100] Figure 33 is a side view of the second mating tooth;

[0101] Figure 34 is a front view of the second mating tooth;

[0102] Figure 35 is a schematic diagram of the internal structure of the linkage component;

[0103] Figure 36 is a schematic diagram of the transmission mechanism;

[0104] Figure 37 is a schematic diagram of the rotary feed assembly;

[0105] Figure 38 is an exploded structural diagram of the injection device including the transmission mechanism.

[0106] Figure 39 is a schematic diagram of the injection device including the transmission mechanism in different states;

[0107] Figure 40 is a schematic diagram of the sound-generating tube;

[0108] Figure 41 is a schematic cross-sectional view of the drive sleeve;

[0109] Figure 42 is a schematic diagram of the rotating cylinder;

[0110] Figure 43 is a schematic diagram showing the movement of the lateral protrusion in conjunction with the guide rail. Detailed Implementation

[0111] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0112] In this embodiment of the invention, all directional indications (such as up, down, left, right, front, back, etc.) are only used to explain the relative positional relationships and movement of the components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly. The terms "first," "second," etc., used in this application are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or devices.

[0113] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0114] In a first aspect, referring to Figures 1 to 10, the following embodiments of this application disclose a clutch assembly having an engaged state and a disengaged state, which is convenient to use.

[0115] The clutch assembly includes a knob 1, a ratchet 2, an offset 3, a sound-emitting plate 4, an elastic element 5, and a scale lever 6.

[0116] The knob 1 is hollow inside and is used to drive the bias device 3 to rotate. The knob 1 can rotate clockwise or counterclockwise. For ease of explanation, the counterclockwise direction is referred to as the first direction and the clockwise direction as the second direction in this application.

[0117] The ratchet 2 is housed within the knob 1 and has a side facing the knob 1 and a side away from the knob 1 along the axial direction, wherein ratchet teeth 21 are provided on the side away from the knob 1.

[0118] The biasing device 3 is used to link with the knob 1, so that when the knob 1 rotates, the biasing device 3 can rotate synchronously. At the same time, the biasing device 3 can also move axially between itself and the knob 1. The biasing device 3 includes a main body 31, which has a first end and a second end in the axial direction. The first end of the main body 31 is provided with a connecting platform 32, and the ratchet 2 is nested outside the connecting platform 32. The connecting platform 32 is provided with a first inclined surface 321.

[0119] The sound-generating plate 4 is a hollow shell. The second end of the sound-generating plate 4, which is axially mounted on the main body 31, is sleeved on the biaser 3. A helical tooth 41 is provided on the end corresponding to the first inclined surface 321. The sound-generating plate 4 also has a second inclined surface 42, which is located inside the helical tooth 41. The helical tooth 41 and the second inclined surface 42 are coaxially arranged. The helical tooth 41 and the second inclined surface 42 are two layers formed by the sound-generating plate 4 from the outside to the inside. The diameter of the center line of the cross section of the helical tooth 41 is larger than the diameter of the center line of the cross section of the second inclined surface 42. At the same time, in the axial direction of the sound-generating plate 4, the helical tooth 41 is higher than the second inclined surface 42.

[0120] The sound-generating plate 4 is fitted with the ratchet 2 and the biasing device 3, wherein the helical teeth 41 mesh with the ratchet teeth 21, and the second inclined surface 42 is used to fit with the first inclined surface 321. Through the above arrangement, the sound-generating plate 4 is fitted with the ratchet 2. At the same time, the sound-generating plate 4 also makes contact with the biasing device 3 through the second inclined surface 42 and the first inclined surface 321.

[0121] The second inclined surface 42 has the same inclination angle as the first inclined surface 321, and the inclination direction of the second inclined surface 42 and the first inclined surface 321 is also the same as the inclination direction of the helical tooth 41 and the ratchet tooth 21. In one embodiment, the second inclined surface 42, the first inclined surface 321, the helical tooth 41 and the ratchet tooth 21 are all inclined clockwise.

[0122] The elastic element 5 is located between the sound-emitting plate 4 and the scale rod 6. The elastic element 5 and the scale rod 6 are fixed relative to each other, and the elastic element 5 will not be subjected to the force from the scale rod 6.

[0123] The scale rod 6 is linked to the sound-generating plate 4, and the two are connected by a keyway. When the sound-generating plate 4 rotates, it drives the scale rod 6 to rotate, and the scale rod 6 drives the energy storage device of the injection device to rotate.

[0124] Based on the above structure, the engagement and disengagement states of the clutch assembly are as follows: the sound-emitting plate 4 and the ratchet 2 have a meshing state and a disengagement state, as shown in Figures 7 and 8. Initially, the elastic element 5 is in a compressed state, and the sound-emitting plate 4 is pushed by the elastic element 5, causing the helical tooth 41 to mesh with the ratchet tooth 21. At this time, the sound-emitting plate 4 and the ratchet 2 are in a meshing state. When the knob 1 is rotated in the second direction, i.e., clockwise, the biasing device 3 is driven to rotate. At this time, the ratchet 2 is fixed, and the biasing device 3 drives the sound-emitting plate 4 to rotate clockwise relative to the ratchet 2. The helical tooth 41 of the sound-emitting plate 4 moves downward axially relative to the ratchet tooth 21 of the ratchet 2. After the helical tooth 41 passes over a ratchet tooth 21, the two are briefly separated. Then the sound-emitting plate 4 is pushed upward by the elastic element 5, and the helical tooth 41 meshes with the next ratchet tooth 21. That is, the sound-emitting plate 4 rotates one tooth clockwise relative to the ratchet 2. After rotation, the two continue to mesh. The sound-generating plate 4 drives the scale rod 6, which in turn drives the energy storage device to store energy. Rotating the knob 1 clockwise completes the energy storage action. When rotated to the preset position, the energy storage device causes the sound-generating plate 4 to tend to rotate counterclockwise. At this time, the helical teeth 41 of the sound-generating plate 4 mesh with the ratchet teeth 21, the ratchet 2 remains stationary, and the counterclockwise rotation tendency of the sound-generating plate 4 is blocked.

[0125] In one embodiment, the energy storage device includes a torsion spring, which rotates clockwise to store energy when the knob 1 is turned clockwise.

[0126] When knob 1 is rotated in the first direction, i.e., counterclockwise, the biasing device 3 is driven to rotate counterclockwise. The first inclined surface 321 of the biasing device 3 presses against the second inclined surface 42 of the sound-producing plate 4. At this time, the sound-producing plate 4 is subjected to a force in the inclined direction of the biasing device 3. The sound-producing plate 4 has a tendency to move in two directions: counterclockwise rotation and axial downward. However, the helical teeth 41 of the sound-producing plate 4 are engaged with the ratchet teeth 21 at this time. The counterclockwise rotation is blocked by the ratchet 2, and the sound-producing plate 4 can only move axially downward. The axial downward displacement of the sound-producing plate 4 presses against the elastic element 5. After the elastic element 5 is compressed to a certain extent, that is, after the sound-producing plate 4 is axially displaced a certain distance, the helical teeth 41 disengage from the ratchet teeth 21, thereby disengaging the ratchet 2 from the sound-producing plate 4. At this time, the sound-producing plate 4 and the ratchet 2 are in a separated state, as shown in Figures 9 and 10. After the sound-generating plate 4 separates from the ratchet 2, the sound-generating plate 4, no longer obstructed by the ratchet 2, begins to rotate counterclockwise. The first inclined surface 321 of the biasing device 3 disengages from the second inclined surface 42 of the sound-generating plate 4, creating an axial gap between the biasing device 3 and the sound-generating plate 4. The elastic element 5 pushes the sound-generating plate 4 axially upward, and the sound-generating plate 4 and the ratchet 2 return to their meshing state. That is, the sound-generating plate 4 rotates one tooth counterclockwise relative to the ratchet 2, and after rotation, they continue to mesh. Each time the sound-generating plate 4 rotates one tooth, it separates from the ratchet 2, and then they re-engage. Through the above process, the energy storage device, which stores energy during the clockwise rotation of the knob 1, releases energy during the counterclockwise rotation of the knob 1. When the energy storage device is a torsion spring, the torsion spring also rotates counterclockwise to release the stored energy during the counterclockwise rotation of the knob 1.

[0127] In this application, the connecting platform 32 is further provided with a plurality of protrusions 322 arranged at intervals, and the plurality of protrusions 322 form a stop position 323. The sound-emitting plate 4 is further provided with a plurality of abutment posts 43 arranged at intervals, the abutment posts 43 being coaxially arranged with the second inclined surface 42, and the abutment posts 43 being located within the stop position 323. After the biasing device 3 is rotated by the knob 1 at a certain angle, the protrusions 322 abut against the abutment posts 43 of the sound-emitting plate 4. When the knob 1 is rotated in the second direction, that is, clockwise, the biasing device 3 is driven to rotate. At this time, the ratchet 2 is fixed, and the protrusions 322 rotate clockwise and abut against the abutment posts 43, thereby causing the biasing device 3 to drive the sound-emitting plate 4 to rotate clockwise relative to the ratchet 2.

[0128] When knob 1 is rotated in the first direction, i.e. counterclockwise, bias 3 is driven to rotate counterclockwise. After the protrusion 322 rotates counterclockwise by a certain angle, it contacts the abutment post 43, and the sound-emitting plate 4 moves axially downward.

[0129] In one embodiment, both the protrusion 322 and the abutment post 43 are cubes or cuboids.

[0130] Please refer to Figure 2. In this application, the knob 1 is a housing 11 with one end open. The other end opposite the opening is provided with an end face. A protrusion 12 is provided along the axial direction on the end face of the housing 11 opposite to the opening. The protrusion 12 is formed by extending outward from the center of the end face, with the farthest end extending beyond the knob 1. An accommodating space 13 is formed between the protrusion 12 and the housing 11. A connecting key 14 is provided on the outer wall of the protrusion 12.

[0131] In one embodiment, the housing 11 is a hollow cylinder with one end open, and the cross-section of the protrusion 12 is annular.

[0132] In this application, the outer wall of the knob 1 is also provided with a threaded structure 15 to increase friction and make it easier for the user to rotate the knob 1.

[0133] In this application, the main body 31 is a hollow cylinder to facilitate the housing of the protrusion 12 of the knob 1. A connecting groove 311 is provided on the inner wall of the main body 31, which is used to connect with the keyway of the connecting key 14. When the knob 1 rotates, it can drive the offset device 3 to rotate together, and the offset device 3 can also move axially between itself and the knob 1. A connecting platform 32 is located at one end of the main body 31 in the axial direction and is disposed on the outer surface of the main body 31. The connecting platform 32 includes a ring structure, one side of which is flush with the end of the main body 31, and the other side has a protruding first inclined surface 321. A protrusion 322 is also located on the same side as the first inclined surface 321.

[0134] In this application, the ratchet 2 is hollow in the middle, and the protrusion 12 passes through the middle of the ratchet 2, and the ratchet 2 is accommodated in the accommodating space 13. The external dimension of the protrusion 12 is smaller than the inner diameter of the main body 31, and part of the protrusion 12 extends into the main body 31, so that the connecting groove 311 and the connecting key 14 cooperate with each other.

[0135] In this application, the other end of the sound-emitting sheet 4 is hollow to form a second receiving space 44, and part of the elastic element 5 is accommodated in the second receiving space 44. During use, the sound-emitting sheet 4 and the elastic element 5 always remain in contact.

[0136] In this application, the elastic element 5 is a spring, which has a simple structure and low cost.

[0137] To address the technical problem, this application also provides an injection device, which includes the aforementioned clutch assembly. The clutch assembly enables dose adjustment and dose reversal within the injection device. Specifically, when knob 1 is rotated clockwise, the energy storage device stores energy, completing the dose adjustment of the injection device, and subsequent release allows for drug injection. When knob 1 is rotated counterclockwise, the energy storage device releases its stored energy, completing the dose reversal of the injection device.

[0138] Using the clutch assembly and injection device of the present invention can solve technical problems, is easy to use, and has stable engagement and disengagement, convenient retraction, stable engagement and disengagement between the ratchet and the sound-generating plate, high power transmission efficiency, and the dosage setting and injection clutch are independent, avoiding mutual interference.

[0139] Secondly, referring to Figures 1 to 20, the following embodiments of this application disclose a dose setting device, which includes a knob 1, a housing 9, a clutch assembly, a dose range setting element, a scale rod 6, an energy storage element 7, and a mounting base 8.

[0140] Knob 1 can rotate in both directions and is used to engage with the clutch assembly. Knob 1 can rotate clockwise or counterclockwise. For ease of explanation, the clockwise direction is referred to as the first direction and the counterclockwise direction as the second direction in this application.

[0141] The outer casing 9 is hollow inside, used to house the clutch assembly, dosage setting element, scale rod 6, energy storage element 7, and mounting base 8.

[0142] The clutch assembly has an engaged state and an disengaged state.

[0143] The dosage range setting element is linked with the scale lever 6 to limit the range of rotation of the knob 1, that is, to limit the maximum value that the knob 1 can rotate in a single rotation.

[0144] The scale lever 6 is linked with the clutch assembly to store energy in the energy storage component 7.

[0145] One end of the energy storage element 7 is connected to the scale rod 6, and the other end is fixed to the mounting base 8. The scale rod 6 can drive the energy storage element 7 to rotate. Since the other end of the energy storage element 7 is fixed by the mounting base 8 and cannot rotate, the energy storage element 7 can rotate to store energy at this time.

[0146] When the clutch assembly is engaged, knob 1 is rotated clockwise in the first direction, accumulating energy in the energy storage unit 7, which can then release energy to inject the drug. When knob 1 is rotated counterclockwise in the second direction, the clutch assembly switches between engaged and disengaged states, the energy storage unit 7 releases energy, and the injection dose is adjusted accordingly.

[0147] The clutch assembly in this application includes a ratchet 2, an offset 3, a sound-emitting plate 4, and an elastic element 5;

[0148] Knob 1 is hollow inside and is used to drive the bias device 3 to rotate.

[0149] The ratchet 2 is housed within the knob 1 and has a side facing the knob 1 and a side away from the knob 1 along the axial direction, wherein ratchet teeth 21 are provided on the side away from the knob 1.

[0150] The biasing device 3 is used to link with the knob 1, so that when the knob 1 rotates, the biasing device 3 can rotate synchronously. At the same time, the biasing device 3 can also move axially between itself and the knob 1. The biasing device 3 includes a main body 31, which has a first end and a second end in the axial direction. The first end of the main body 31 is provided with a connecting platform 32, and the ratchet 2 is nested outside the connecting platform 32. The connecting platform 32 is provided with a first inclined surface 321.

[0151] The sound-generating plate 4 is a hollow shell. The second end of the sound-generating plate 4, which is axially mounted on the main body 31, is sleeved on the biaser 3. A helical tooth 41 is provided on the end corresponding to the first inclined surface 321. The sound-generating plate 4 also has a second inclined surface 42, which is located inside the helical tooth 41. The helical tooth 41 and the second inclined surface 42 are coaxially arranged. The helical tooth 41 and the second inclined surface 42 are two layers formed by the sound-generating plate 4 from the outside to the inside. The diameter of the center line of the cross section of the helical tooth 41 is larger than the diameter of the center line of the cross section of the second inclined surface 42. At the same time, in the axial direction of the sound-generating plate 4, the helical tooth 41 is higher than the second inclined surface 42.

[0152] The sound-generating plate 4 is fitted with the ratchet 2 and the biasing device 3, wherein the helical teeth 41 mesh with the ratchet teeth 21, and the second inclined surface 42 is used to fit with the first inclined surface 321. Through the above arrangement, the sound-generating plate 4 is fitted with the ratchet 2. At the same time, the sound-generating plate 4 also makes contact with the biasing device 3 through the second inclined surface 42 and the first inclined surface 321.

[0153] The second inclined surface 42 has the same inclination angle as the first inclined surface 321, and the inclination direction of the second inclined surface 42 and the first inclined surface 321 is also the same as the inclination direction of the helical tooth 41 and the ratchet tooth 21. In one embodiment, the second inclined surface 42, the first inclined surface 321, the helical tooth 41 and the ratchet tooth 21 are all inclined clockwise.

[0154] The elastic element 5 is located between the sound-emitting plate 4 and the scale rod 6. The elastic element 5 and the scale rod 6 are fixed relative to each other, and the elastic element 5 will not be subjected to the force from the scale rod 6.

[0155] The scale rod 6 is linked to the sound-generating plate 4, and the two are connected by a keyway. When the sound-generating plate 4 rotates, it drives the scale rod 6 to rotate, and the scale rod 6 drives the energy storage component 7 to rotate, thereby storing energy in the energy storage component 7.

[0156] Based on the above structure, the sound-producing plate 4 and the ratchet 2 have a meshing state and a disengaged state, as shown in Figures 7 to 10. Initially, the elastic element 5 is in a compressed state, and the sound-producing plate 4 is pushed by the elastic element 5, causing the helical tooth 41 to mesh with the ratchet tooth 21. At this time, the sound-producing plate 4 and the ratchet 2 are in a meshing state. When the knob 1 is rotated in the first direction, i.e., clockwise, the biasing device 3 is driven to rotate. At this time, the ratchet 2 is fixed, and the biasing device 3 drives the sound-producing plate 4 to rotate clockwise relative to the ratchet 2. The helical tooth 41 of the sound-producing plate 4 moves downward axially relative to the ratchet tooth 21 of the ratchet 2. After the helical tooth 41 passes over a ratchet tooth 21, the two are briefly separated. Then the sound-producing plate 4 is pushed upward by the elastic element 5, and the helical tooth 41 meshes with the next ratchet tooth 21. That is, the sound-producing plate 4 rotates one tooth clockwise relative to the ratchet 2. After rotation, the two continue to mesh. The sound-generating plate 4 drives the scale rod 6, which in turn drives the energy storage component 7 to rotate and store energy. Rotating the knob 1 clockwise completes the energy storage action of the energy storage component 7. When rotated to the preset position, the energy storage component 7, after storing energy, tends to drive the sound-generating plate 4 to rotate counterclockwise. At this time, the helical teeth 41 of the sound-generating plate 4 mesh with the ratchet teeth 21, the ratchet 2 remains stationary, and the counterclockwise rotation tendency of the sound-generating plate 4 is blocked.

[0157] In one embodiment, the energy storage element 7 is a torsion spring. When the knob 1 is turned clockwise, the torsion spring also rotates clockwise to store energy.

[0158] When knob 1 is rotated in the second direction, i.e., counterclockwise, the biasing device 3 is driven to rotate counterclockwise. The first inclined surface 321 of the biasing device 3 presses against the second inclined surface 42 of the sound-producing plate 4. At this time, the sound-producing plate 4 is subjected to a force in the inclined direction of the biasing device 3. The sound-producing plate 4 has a tendency to move in two directions: counterclockwise rotation and axial downward. However, the helical teeth 41 of the sound-producing plate 4 are engaged with the ratchet teeth 21 at this time. The counterclockwise rotation is blocked by the ratchet 2, and the sound-producing plate 4 can only move axially downward. The axial downward displacement of the sound-producing plate 4 presses against the elastic element 5. After the elastic element 5 is compressed to a certain extent, that is, after the sound-producing plate 4 has moved a certain distance axially downward, the helical teeth 41 disengage from the ratchet teeth 21, thereby disengaging the ratchet 2 from the sound-producing plate 4. At this time, the sound-producing plate 4 and the ratchet 2 are in a separated state, as shown in Figures 9 and 10. After the sound-generating plate 4 separates from the ratchet 2, the sound-generating plate 4, no longer obstructed by the ratchet 2, begins to rotate counterclockwise. The first inclined surface 321 of the biasing device 3 disengages from the second inclined surface 42 of the sound-generating plate 4, creating an axial gap between the biasing device 3 and the sound-generating plate 4. The elastic element 5 pushes the sound-generating plate 4 axially upward, and the sound-generating plate 4 and the ratchet 2 return to their meshing state. That is, the sound-generating plate 4 rotates one tooth counterclockwise relative to the ratchet 2, and after rotation, they continue to mesh. Each time the sound-generating plate 4 rotates one tooth, it separates from the ratchet 2, and then they re-engage. Through the above process, the energy storage element 7, which stores energy during the clockwise rotation of the knob 1, releases energy during the counterclockwise rotation of the knob 1. When the energy storage element 7 is a torsion spring, the torsion spring also rotates counterclockwise to release the stored energy during the counterclockwise rotation of the knob 1.

[0159] In this application, the connecting platform 32 is further provided with a plurality of protrusions 322 arranged at intervals, and the plurality of protrusions 322 form a stop position 323. The sound-emitting plate 4 is further provided with a plurality of abutment posts 43 arranged at intervals, the abutment posts 43 being coaxially arranged with the second inclined surface 42, and the abutment posts 43 being located within the stop position 323. After the biasing device 3 is rotated by the knob 1 at a certain angle, the protrusions 322 abut against the abutment posts 43 of the sound-emitting plate 4. When the knob 1 is rotated in the first direction, that is, clockwise, the biasing device 3 is driven to rotate. At this time, the ratchet 2 is fixed, and the protrusions 322 rotate clockwise and abut against the abutment posts 43, thereby causing the biasing device 3 to drive the sound-emitting plate 4 to rotate clockwise relative to the ratchet 2.

[0160] When knob 1 is rotated in the second direction, i.e. counterclockwise, bias 3 is driven to rotate counterclockwise. After the protrusion 322 rotates counterclockwise by a certain angle, it contacts the abutment post 43, and the sound-emitting plate 4 moves axially downward.

[0161] In one embodiment, both the protrusion 322 and the abutment post 43 are cubes or cuboids.

[0162] Please refer to Figure 2. In this application, the knob 1 is a housing 11 with one end open. The other end opposite the opening is provided with an end face. A protrusion 12 is provided along the axial direction on the end face of the housing 11 opposite to the opening. The protrusion 12 is formed by extending outward from the center of the end face, with the farthest end extending beyond the knob 1. An accommodating space 13 is formed between the protrusion 12 and the housing 11. A connecting key 14 is provided on the outer wall of the protrusion 12.

[0163] In one embodiment, the housing 11 is a hollow cylinder with one end open, and the cross-section of the protrusion 12 is annular.

[0164] In this application, the outer wall of the knob 1 is also provided with a threaded structure 15 to increase friction and make it easier for the user to rotate the knob 1.

[0165] In this application, the main body 31 is a hollow cylinder to facilitate the housing of the protrusion 12 of the knob 1. A connecting groove 311 is provided on the inner wall of the main body 31, which is used to connect with the keyway of the connecting key 14. When the knob 1 rotates, it can drive the offset device 3 to rotate together, and the offset device 3 can also move axially between itself and the knob 1. A connecting platform 32 is located at one end of the main body 31 in the axial direction and is disposed on the outer surface of the main body 31. The connecting platform 32 includes a ring structure, one side of which is flush with the end of the main body 31, and the other side has a protruding first inclined surface 321. A protrusion 322 is also located on the same side as the first inclined surface 321.

[0166] In this application, the ratchet 2 is hollow in the middle, and the protrusion 12 passes through the middle of the ratchet 2, and the ratchet 2 is accommodated in the accommodating space 13. The external dimension of the protrusion 12 is smaller than the inner diameter of the main body 31, and part of the protrusion 12 extends into the main body 31, so that the connecting groove 311 and the connecting key 14 cooperate with each other.

[0167] In this application, the other end of the sound-emitting sheet 4 is hollow to form a second receiving space 44, and part of the elastic element 5 is accommodated in the second receiving space 44. During use, the sound-emitting sheet 4 and the elastic element 5 always remain in contact.

[0168] In this application, the elastic element 5 is a spring, which has a simple structure and low cost.

[0169] The dosage range setting element in this application includes a fixed base 20 and a scale ring 30. Both the fixed base 20 and the scale ring 30 are sleeved outside the scale rod 6. In the initial position, the fixed base 20 and the scale ring 30 are respectively located at both ends of the scale rod 6 in the axial direction. The fixed base 20 is sleeved outside the ratchet 2, and the ratchet 2 is connected to the fixed base 20 by teeth. The inner wall of the scale ring 30 is connected to the keyway of the scale rod 6, so that the scale ring 30 and the scale rod 6 can rotate together and slide along the axial direction. The outer wall of the scale ring 30 is threadedly connected to the outer casing 9. When the knob 1 is turned, the scale ring 30 is driven to rotate by the scale rod 6, and the outer wall of the scale ring 30 is threadedly connected to the outer casing 9 and guided by the outer casing 9 to move spirally.

[0170] In one embodiment, a first tooth structure is provided on the outer peripheral surface of the ratchet 2, and a second tooth structure adapted to the first tooth structure is provided on the inner wall of the fixed seat 20. The ratchet 2 and the fixed seat 20 are connected by the first and second tooth structures, and can rotate together or slide axially. A second connecting key 304 is provided on the inner wall of the scale ring 30, and a second connecting groove 61 is provided on the outer surface of the scale rod 6. The scale ring 30 and the scale rod 6 are connected by a keyway.

[0171] In this application, the outer wall of the mounting base 8 is provided with a first stop protrusion 81, and the end of the scale ring 30 opposite to the mounting base 8 is provided with a second stop protrusion 301. When the first stop protrusion 81 and the second stop protrusion 301 are in contact, the scale ring 30 cannot rotate relative to the mounting base 8 in the second direction, i.e., counterclockwise. When the knob 1 is rotated clockwise, the dose setting is adjusted forward; when the knob 1 is rotated counterclockwise, the dose setting is reset. When the first stop protrusion 81 and the second stop protrusion 301 are in contact, the dose setting device is located at the minimum end of the dose range, which is equivalent to setting the dose to zero. At this time, the knob 1 can only be rotated clockwise to increase the dose, and cannot be rotated counterclockwise to decrease the dose.

[0172] The fixed base 20 has a third stop protrusion 201 on the end opposite to the scale ring 30, and the scale ring 30 has a fourth stop protrusion 302 on the end opposite to the fixed base 20. When the knob 1 is rotated in the first direction, i.e., clockwise, the scale ring 30 is driven to rotate by the scale rod 6 and guided upward spirally by the outer casing 9. The first stop protrusion 81 disengages from the second stop protrusion 301. When the scale ring 30 rotates to the point where the fourth stop protrusion 302 abuts against the third stop protrusion 201, the scale ring 30 is stopped by the fixed base 20 and cannot continue to rotate in the first direction, i.e., clockwise. At this time, the dosage setting device is at the maximum end of the dosage range, which is equivalent to the set dosage being at its maximum value. At this time, the knob 1 can only be rotated counterclockwise to decrease the dosage, and cannot be rotated clockwise to increase the dosage.

[0173] In the initial state, as shown in Figure 12, the scale ring 30 is at its lowest point. At this time, the dosage setting device is at the minimum end of the dosage range, meaning the set dosage is zero. The first stop protrusion 81 at the lower end of the scale ring 30 abuts against the second stop protrusion 301 of the mounting base 8. At this point, the knob 1 cannot rotate counterclockwise, meaning the dosage cannot be reduced further. When the knob 1 rotates clockwise, the scale ring 30 is driven by the scale rod 6 and guided upwards by the outer casing 9 until the fourth stop protrusion 302 at the upper part abuts against the third stop protrusion 201 of the fixing base 20. The knob 1 can no longer be rotated, as shown in Figure 13. At this point, the dosage setting device is at the maximum end of the dosage range, meaning the set dosage is at its maximum. The axial length between the upper third stop protrusion 201 and the lower first stop protrusion 81 is the single injection dosage range of the injection device. When setting the dosage, the scale ring 30 can only rotate within this space. As described above, when knob 1 is rotated clockwise, the energy storage device 7 stores energy, which can then be released to inject the drug. Rotating knob 1 to any position within the single injection dose range sets the injection dose. The energy stored in the energy storage device 7 and the single injection dose are proportional to the axial distance of this rotation.

[0174] As shown in Figures 16 and 17, the inner wall of the outer casing 9 in this application is provided with a first thread 91, and the outer wall of the scale ring 30 is provided with a matching second thread 303. The two are threadedly connected. When the scale ring 30 is rotated by the scale rod 6, it is guided by the first thread 91 of the outer casing 9 to move spirally. The outer casing 9 is also provided with a scale window 92, and the outer wall of the scale ring 30 is provided with scale marks. The scale marks are the scale values ​​marked on the scale ring 30. The scale marks correspond to the scale window 92. During the injection process, the scale marks of the scale ring 30 can be observed through the scale window 92 of the outer casing 9, thereby accurately setting the injection dose.

[0175] To address the technical problem, this application also provides an injection device, which includes the dosage setting device described above. The dosage setting device enables dosage adjustment and dosage reversal of the injection device. Specifically, when knob 1 is rotated clockwise, the energy storage element 7 stores energy, completing the dosage adjustment of the injection device, and subsequent release allows for drug injection. When knob 1 is rotated counterclockwise, the energy storage element 7 releases its stored energy, completing the dosage reversal of the injection device. The dosage range setting element limits the range of knob 1 rotation, thus limiting the maximum dose that can be injected in a single dose.

[0176] Using the dosage setting device and injection device of the present invention, the dosage can be set and adjusted by rotating the knob. The one-way teeth of the clutch component cooperate with the inclined structure to rotate. When the dosage is set forward, the one-way teeth slide between them. When the dosage is adjusted back, the inclined surfaces slide between them. The movement is stable and the feedback is obvious.

[0177] Thirdly, referring to Figures 21 to 35, the following embodiments of this application disclose a syringe reset mechanism and transmission device. The syringe reset mechanism includes a linkage component 1004 and a transmission component 1003.

[0178] The linkage component 1004 (which is also the biaser 3) is provided with a top abutment 1041;

[0179] The transmission component 1003 (which is also the sound-generating piece 4) is provided with an elastic reset part 1031. The elastic reset part 1031 is used to abut against the top part 1041.

[0180] The elastic reset part 1031 is used to engage with the abutting top 1041 in the following manner: when the transmission member 1003 is restricted to rotate in the first direction, when the linkage member 1004 rotates in the first direction A, causing relative movement between the transmission member 1003 and the linkage member 1004, so that the elastic reset part 1031 is deformed by the abutting top 1041 (as shown in Figures 24 and 25), the elastic reset part 1031 generates reset energy to cause the linkage member 1004 to rotate in the second direction B when it is released from the linkage member 1004; the first direction is opposite to the second direction.

[0181] In this embodiment, the syringe increases the set dose during forward adjustment and decreases the set dose during dose setting reversal. The direction in which the syringe decreases the set dose is the dose setting reversal direction. The first direction is the dose setting reversal direction. In this embodiment, the first direction is counterclockwise, meaning the dose setting reversal direction is counterclockwise, and the second direction is clockwise. Of course, the first and second directions are not limited to these and can be set according to actual needs.

[0182] When the dose setting is reset, the syringe's energy storage device 1001 releases energy to reduce the set dose. When the syringe's energy storage is reset to the corresponding zero-scale set dose, the energy storage device 1001 can no longer release energy and cannot rotate in the direction of dose setting reset (i.e., it cannot rotate in the first direction). The transmission member 1003 connected to the energy storage device 1001 also cannot rotate in the first direction (i.e., the transmission member 1003 is restricted from rotating in the first direction).

[0183] When the syringe's energy storage corresponds to the zero-scale set dosage, the linkage member 1004 rotates along the first direction under the action of an externally applied return force. Since the transmission member 1003 is restricted from rotating along the first direction, relative movement occurs between the transmission member 1003 and the linkage member 1004, causing the elastic reset part 1031 to deform against the abutment 1041, thereby generating reset energy. After the externally applied return force is removed, the elastic reset part 1031 elastically recovers and releases the reset energy to the abutment 1041, thus utilizing the reset... Energy drives the linkage component 1004 to rotate in the second direction, causing the linkage component 1004 to move toward the corresponding zero-scale dose position. Since the reset energy generated by the elastic deformation of the elastic reset part 1031 acts directly on the linkage component 1004 without the need for transmission through intermediate parts, it helps the linkage component 1004 to reset quickly. Moreover, the cooperation between the elastic reset part 1031 of the transmission component 1003 and the abutment 1041 of the linkage component 1004 helps the linkage component 1004 to reset quickly, making its structure simpler and easier to manufacture.

[0184] The syringe reset mechanism also includes an elastic element 1002; when the transmission member 1003 is restricted to rotate in the first direction, when the linkage member 1004 rotates in the first direction, causing relative movement between the transmission member 1003 and the linkage member 1004, and the elastic element 1002 is compressed by the transmission member 1003, the elastic element 1002 generates driving energy that acts on the linkage member 1004 through the transmission member 1003 when released, causing the linkage member 1004 to rotate in the second direction. When the syringe's stored energy is at the corresponding zero-scale set dose, the linkage component 1004 rotates along the first direction under the action of an externally applied return force. Since the syringe's stored energy is at the corresponding zero-scale set dose, the transmission component 1003 cannot rotate along the first direction (i.e., the transmission component 1003 is restricted from rotating along the first direction). At this time, relative movement occurs between the transmission component 1003 and the linkage component 1004, causing the elastic element 1002 to be compressed by the transmission component 1003, and the elastic reset part 1031 to deform under the pressure of the top part 1041. The compression of the elastic element 1002 generates driving energy, and the deformation of the elastic reset part 1031 generates reset energy. After the externally applied return force is removed, the elastic element 1002 elastically resets, and the elastic element 1002... The driving energy of 002 acts on the linkage component 1004 through the transmission component 1003. The elastic reset part 1031 elastically restores itself and releases reset energy to the abutment top 1041 against which it abuts. Under the combined action of the driving energy and the reset energy, the linkage component 1004 rotates in the second direction and can quickly reset to the corresponding zero-scale dose position. Therefore, based on the abutment top 1041 of the linkage component 1004 and the elastic reset part 1031 of the transmission component 1003, combined with the elastic element 1002, the elastic reset part 1031 and the elastic element 1002 can play a dual driving role, further improving the timeliness of the reset of the linkage component 1004. This allows the linkage component 1004 to quickly respond and reset after the zero set dose is returned, thus improving the reliability of the product.

[0185] The elastic element 1002 can be a spring, elastic strip, or anything else that can perform the corresponding function.

[0186] Preferably, the transmission component 1003 and the linkage component 1004 form a pushing fit structure.

[0187] In this embodiment, as shown in Figures 25-29, the pushing and engaging structure includes a first pushing inclined surface 1043 disposed on the linkage member 1004 and a second pushing inclined surface 1032 disposed on the transmission member 1003; the two ends of the first pushing inclined surface 1043 are offset in the circumferential direction of the linkage member 1004; the second pushing inclined surface 1032 is used for sliding engagement with the first pushing inclined surface 1043. When the syringe's stored energy is at the zero-scale set dose, the linkage member 1004 rotates along the first direction under the action of an externally applied return force. Since the syringe's stored energy is at the zero-scale set dose, the transmission member 1003 is restricted from rotating along the first direction. The transmission member 1003 is pushed downwards by the interaction of the first pushing inclined surface 1043 and the second pushing inclined surface 1032, compressing the elastic member 1002. Simultaneously, because the linkage member 1004 rotates relative to the transmission member 1003 along the first direction, the abutment 1041 of the linkage member 1004 abuts against and compresses the elastic reset part 1031 of the transmission member 1003, forcing the elastic reset part 1031 of the transmission member 1003 to deform and generate reset energy. After the externally applied return force is removed, the compressed elastic member 1002 returns to its original state, and the generated driving energy is used for… The transmission member 1003, through its second pushing inclined surface 1032 abutting against the first pushing inclined surface 1043 of the linkage member 1004, can push the linkage member 1004 to rotate in the second direction. In this way, the driving energy generated by the elastic member 1002 can be applied to the linkage member 1004 through the transmission member 1003 to drive the linkage member 1004 to rotate in the second direction. At the same time, the elastic reset part 1031 of the transmission member 1003 elastically recovers, and the reset energy generated by the elastic reset part 1031 is released to the linkage member 1004 and acts on the abutting top 1041 of the linkage member 1004, driving the linkage member 1004 to rotate in the second direction. Therefore, the linkage member 1004 can rotate in the second direction under the combined action of driving energy and reset energy, and can quickly reset to the corresponding zero-scale dose position.

[0188] Of course, the aforementioned push-fit structure is not limited to this and can be set according to actual needs.

[0189] The syringe's reset mechanism also includes a base 1006, which has a limiting part 1061 for the linkage member 1004 to abut against. When the syringe's stored energy is at the zero-scale set dose, the linkage member 1004 rotates along a first direction under the action of an externally applied return force. The elastic element 1002 is compressed, generating driving energy, and the elastic reset part 1031 is deformed, generating reset energy. After the externally applied return force is removed, the driving energy generated by the compression of the elastic element 1002 acts on the transmission member 1003. Since the first pushing inclined surface 1043 of the linkage member 1004 abuts against the second pushing inclined surface 1032 of the transmission member 1003, this driving energy exerts a force on the linkage member 1004 through the transmission member 1003, normal to the first pushing inclined surface 1043. When component 1004 moves upward against the limiting part 1061, it is blocked by the limiting part 1061 of the base 1006. Its component force pushes the linkage component 1004 to rotate in the second direction. At the same time, the reset energy of the elastic reset part 1031 acts on the top 1041 of the linkage component 1004. Through this reset energy transmission component 1003, there is a force normal to the top 1041 of the linkage component 1004. Because the linkage component 1004 moves upward against the limiting part 1061 and is blocked by the limiting part 1061 of the base 1006, its component force pushes the linkage component 1004 to rotate in the second direction, so that the linkage component 1004 can quickly reset to the corresponding zero-scale dose position.

[0190] The external force for reversal can be applied directly or indirectly to the linkage member 1004. In this embodiment, the base 1006 is configured as a torsion member that can rotate synchronously with the linkage member 1004. When the syringe's stored energy is used to perform dose setting reversal at the corresponding zero-scale set dose, the user can apply a reversal force to the torsion member to make it rotate along the dose setting reversal direction, and drive the linkage member 1004 to rotate along the first direction through the torsion member, thereby transmitting the reversal force to the linkage member 1004.

[0191] The top abutment 1041 is an inclined abutment surface, and the two ends of the inclined abutment surface are staggered in the circumferential direction of the linkage component 1004; the elastic reset part 1031 is a cantilever.

[0192] Of course, in addition to setting the top abutment 1041 as abutment slope and the elastic reset part 1031 as cantilever, the top abutment 1041 and the elastic reset part 1031 can also be set as other according to actual needs.

[0193] The linkage member 1004 is provided with a first limiting surface 1042, and the transmission member 1003 is provided with a second limiting surface 1033 for the first limiting surface 1042 to abut against. When the transmission member 1003 is restricted to rotate in the first direction, the linkage member 1004 rotates in the first direction. When the first limiting surface 1042 abuts against the second limiting surface 1033, the linkage member 1004 cannot continue to rotate. Therefore, by using the first limiting surface 1042 and the second limiting surface 1033, the maximum rotatable angle of the linkage member 1004 is limited.

[0194] As shown in Figures 21-35, the present invention also discloses a transmission device, which includes an energy storage device 1001, a functional collar 1005, a support member 1007, and the aforementioned syringe reset mechanism. A transmission structure for transmission between the energy storage device 1001 and the transmission member 1003 is formed between the energy storage device 1001 and the transmission member 1003. The functional collar 1005 rotates synchronously with the energy storage device 1001 and can move relative to the energy storage device 1001. A first stop position 1051 is provided on the functional collar 1005, and a second stop position 1071 is provided on the support member 1007 for the first stop position 1051 to abut against. When the first stop position 1051 abuts against the second stop position 1071, the transmission member 1003 is restricted to rotate in a first direction. When the energy storage of the syringe is set to the corresponding zero-scale dose, the energy storage device 1001 can no longer release energy. The first stop 1051 and the second stop 1071 of the functional collar 1005 abut against each other. Through the limiting effect of the second stop 1071 on the first stop 1051, the rotation of the functional collar 1005 in the first direction is restricted, so that neither the energy storage device 1001 nor the transmission member 1003 can rotate in the first direction. That is, the transmission member 1003 is restricted to rotate in the first direction.

[0195] The transmission structure includes a transmission groove and a transmission protrusion for movably embedding within the transmission groove. One of the transmission groove and the transmission protrusion is disposed on the energy storage device 1001, and the other is disposed on the transmission member 1003, so that when the transmission protrusion is embedded in the transmission groove, rotational motion can be transmitted between the energy storage device 1001 and the transmission member 1003, and axial movement can occur. Of course, other structures can also be used for transmission between the energy storage device 1001 and the transmission member 1003, as long as they are suitable for transmission between the energy storage device 1001 and the transmission member 1003.

[0196] In this embodiment, the elastic element 1002 is disposed between the transmission member 1003 and the energy storage device 1001. Of course, the position of the elastic element 1002 is not limited to this, as long as it can play a corresponding elastic role.

[0197] The energy storage device 1001 includes a scale rod 1011 and a torsion spring 1012. The torsion spring 1012 is disposed between the scale rod 1011 and the support member 1007. The transmission structure is formed between the scale rod 1011 and the transmission member 1003. The functional collar 1005 rotates synchronously with the scale rod 1011 and can move relative to the scale rod 1011. The functional collar 1005 is a scale ring threadedly connected to the support member 1007. Specifically, the elastic element 1002 is disposed between the transmission member 1003 and the scale rod 1011 of the energy storage device 1001. During dose setting adjustment, the scale lever 1011 rotates in the second direction, storing energy through the rotation of the torsion spring 1012. Since the energy stored in the torsion spring 1012 serves as the injection power, the set dose can be increased. The functional collar 1005 rotates along the scale lever 1011 in the second direction and moves relative to the scale lever 1011. As the stored energy increases, the functional collar 1005 moves to the position of the syringe arrow corresponding to the larger set dose scale value, allowing the user to understand the currently set dose. During dose setting reversal, the scale lever 1011 rotates in the first direction, and the torsion spring 1012 rotates accordingly to release energy, decreasing the set dose. As the stored energy decreases, the functional collar 1005 moves to the position of the syringe arrow corresponding to the smaller set dose scale value.

[0198] In addition to the above, the energy storage device 1001 can also be other existing energy storage devices on the market, as long as they can play the role of storing and releasing energy. However, using a scale rod 1011 and a torsion spring 1012 for the energy storage device 1001 is the most preferred embodiment of the present invention, which can facilitate installation.

[0199] The transmission device further includes a ratchet 1008, and the transmission member 1003 is provided with one-way teeth for meshing with the ratchet 1008; when the linkage member 1004 rotates relative to the transmission member 1003 in a first direction, the transmission member 1003 is displaced relative to the ratchet 1008 so that the transmission member 1003 separates from the ratchet 1008; the elastic member 1002 is used to cause the transmission member 1003 to mesh with the ratchet 1008; the transmission member 1003 is provided with a first positive rotational pushing surface 1034, and the linkage member 1004 is provided with a second positive rotational pushing surface 1044 corresponding to the first positive rotational pushing surface 1034. During the dose setting adjustment, the linkage component 1004 rotates in the second direction under the action of the external adjustment force applied by the outside. The second positive rotational pushing surface 1044 of the linkage component 1004 pushes against the first positive rotational pushing surface 1034, which can cause the transmission component 1003 and the energy storage device 1001 to rotate in the second direction, so that the energy storage device 1001 stores energy and increases the set dose. When the dosage setting is adjusted back, the linkage component 1004 rotates in the first direction under the action of the external adjustment force. Since the transmission component 1003 is blocked by the ratchet 1008 when rotating in the first direction, the first pushing inclined surface 1043 of the linkage component 1004 pushes the second pushing inclined surface 1032 of the transmission component 1003, causing the transmission component 1003 to move downward and separate from the ratchet 1008 (as shown in Figure 24). At this time, the ratchet 1008 loses its blocking and limiting effect on the transmission component 1003, the energy storage device 1001 releases energy, and the transmission component 1003 rotates in the first direction along with the energy storage device 1001. Then, the transmission component 1003 is reset to engage with the ratchet 1008 under the action of the elastic force of the elastic element 1002. In this way, the dosage adjustment can be realized, the set dosage is reduced, and the injection dosage correction effect is achieved. During the dose setting and reversal process, the functional collar 1005 rotates along the first direction and moves relative to the energy storage device 1001. When the functional collar 1005 moves to the point where the first stop 1051 and the second stop 1071 abut, the syringe's stored energy corresponds to the zero-scale set dose, and the energy storage device 1001 can no longer release energy. The second stop 1071 limits the first stop 1051, thus restricting the rotation of the functional collar 1005 and the energy storage device 1001 along the first direction. By cooperating with the transmission component 1003, the energy storage device 1001, and the ratchet 1008, the dose setting can be adjusted and reversed.

[0200] In this embodiment, the transmission component 1003 is movably mounted on the outside of the linkage component 1004. The second limiting surface 1033, the elastic reset part 1031, the second pushing inclined surface 1032, and the first forward rotating pushing surface 1034 are all disposed on the inner side of the transmission component 1003, while the first pushing inclined surface 1043, the second forward rotating pushing surface 1044, the first limiting surface 1042, and the top abutment 1041 are all disposed on the outer side of the linkage component 1004.

[0201] As shown in Figures 30-35, the transmission device further includes a rotating component 1009. One of the linkage component 1004 and the rotating component 1009 is provided with a first tooth unit, and the other is provided with a second tooth unit. The linkage component 1004 and the rotating component 1009 transmit rotational motion through the engaging first tooth unit and the second tooth unit. The first tooth unit includes a plurality of first mating teeth 1045 arranged in a circle. The second tooth unit includes a plurality of tooth sub-units arranged in a circle. The interval C between any two adjacent tooth sub-units is greater than the interval between any two adjacent first mating teeth 1045. The tooth sub-unit includes a plurality of second mating teeth 1092, and a tooth groove for the second mating teeth 1092 to be inserted is formed between any two adjacent first mating teeth 1045. When it is necessary to transmit rotational motion between the linkage component 1004 and the rotating component 1009, the first tooth unit and the second tooth unit need to engage. By including a number of tooth sub-units arranged in a circle in the second tooth unit, and making the interval between any two adjacent tooth sub-units larger than the interval between any two adjacent first mating teeth 1045, the number of second mating teeth 1092 can be reduced, thereby reducing the contact surface when the first mating teeth 1045 and the second mating teeth 1092 engage and disengage, and reducing friction.

[0202] Preferably, in the same toothed subunit, at least one second mating tooth 1092 has a height less than the height of the other second mating teeth 1092. This is so that when the first toothed unit and the second toothed unit begin to engage, the first mating tooth 1045 contacts the higher second mating tooth 1092, while the lower second mating teeth 1092 are left unattended, further reducing the contact surface during engagement and thus reducing friction. After full engagement, all the second mating teeth 1092 engage with the first mating tooth 1045, improving the connection strength and preventing tooth breakage.

[0203] In this embodiment, the height of the second mating teeth 1092 at both ends of the toothed subunit is greater than the height of the second mating teeth 1092 in the middle.

[0204] The ends of the second mating tooth 1092 that engage with the first mating tooth 1045 are provided with rounded corners 1097. Specifically, the first mating tooth 1045 and the second mating tooth 1092 have rounded corners 1097 at their circumferential tops, so that when the teeth are initially engaged, they are in point contact and cannot form support, allowing them to slide against each other and preventing jamming that could cause abnormal engagement. The first mating tooth 1045 and the second mating tooth 1092 have arc features 1096 at their axial tops, so that when the teeth are initially engaged, they are in point contact and cannot form support, preventing jamming that could cause abnormal meshing.

[0205] Preferably, the first mating tooth 1045 is larger at the top and smaller at the bottom, and has a guide slope 1098. The shape of the second mating tooth 1092 matches that of the first mating tooth 1045, so that it is easy to guide when the engagement begins, and the engagement process is smooth and stable.

[0206] The rotating component 1009 may be a piston drive rod or a push assembly, so that when the first gear unit and the second gear unit are engaged, the energy released by the energy storage device 1001 can be transmitted to the transmission component 1003 and then transmitted to the rotating component 1009 via the linkage component 1004, thereby providing kinetic energy to the rotating component 1009.

[0207] Fourthly, referring to Figures 36 to 43, the following embodiments of this application disclose a transmission mechanism, which includes:

[0208] Actuator 2002, drive sleeve 2032 and transmission assembly 2004;

[0209] The transmission assembly 2004 is connected to the drive sleeve 2032 via a circumferential guiding structure;

[0210] When the actuator 2002 is pressed, the transmission assembly 2004 can generate a circumferential displacement relative to the drive sleeve 2032 under the thrust of the actuator 2002 by means of the circumferential guiding structure.

[0211] Specifically, the actuator 2002 can be a button or other press-release component. The drive sleeve 2032 is fixed to the power source of the injection device. After the actuator 2002 is pressed to release the power source, the drive sleeve 2032 can be directly driven to rotate by the power source.

[0212] The transmission assembly 2004 can be a single cylindrical component or a combination of multiple cylindrical components.

[0213] Compared with the prior art, the transmission mechanism and injection device provided in the embodiments of the present invention have the following advantages:

[0214] When the user presses the actuator to inject, the transmission mechanism 4 can convert the force of the user pressing the actuator 2002 into the circumferential displacement of the transmission component 2004 relative to the drive sleeve 2032. This circumferential displacement compensates for the problem of the attenuation of the rotation angle of the drive sleeve 2032 transmitted to the rotating cylinder due to manufacturing errors, assembly errors and movement gaps, thereby achieving injection dose compensation.

[0215] The injection device provided in this embodiment of the invention is easy to use, has stable movement, and provides clear feedback.

[0216] In an optional embodiment, the circumferential guiding structure includes a lateral protrusion 2411 and a guide rail 2321, with the lateral protrusion 2411 embedded within the guide rail 2321. Furthermore, the guide rail 2321 can be designed to be closed at both ends, thereby preventing the lateral protrusion 2411 from dislodging during circumferential displacement relative to the guide rail 2321.

[0217] In one specific embodiment, as shown in FIG43, the lateral protrusion 2411 is disposed on the transmission assembly 2004, and the guide rail 2321 is disposed on the drive sleeve 2032. In other specific embodiments, the lateral protrusion 2411 may also be disposed on the drive sleeve 2032, while the guide rail 2321 may be disposed on the transmission assembly 2004.

[0218] In an optional embodiment, the guide rail 2321 includes a sloping groove section with its two ends offset in the circumferential direction and a straight groove section at the far end. When the actuator 2002 is not pressed, the lateral protrusion 2411 is located in the straight groove section. When the actuator 2002 is pressed, under the guidance of the straight groove section, the transmission assembly 2004 first generates an axial displacement until the lateral protrusion 2411 enters the sloping groove section. The relative movement between the lateral protrusion 2411 and the sloping groove section in the extension direction of the sloping groove section causes the transmission assembly 2004 to generate a circumferential displacement relative to the drive sleeve 2032.

[0219] In an optional embodiment, a lateral protrusion 2411 is provided on the end of an axially extending spring arm 2412.

[0220] Specifically, during assembly, the spring arm 2412 can be bent radially inward to facilitate the assembly of the lateral protrusion 2411 into the guide rail 2321.

[0221] Referring specifically to Figures 36-43, this application also discloses an injection device, which includes: a housing assembly 2001, a dosage knob 2006, a transmission mechanism in the first embodiment and any optional embodiment of the first embodiment, a rotary feed assembly 2005, and a power source.

[0222] For ease of description, in this embodiment and subsequent embodiments, as shown in Figure 36, "proximal end" is defined as the end closer to the needle of the injection device, and "distal end" is the end farther away from the needle of the injection device.

[0223] In addition, the power source and the drive sleeve 2032 together form the power assembly 2003, and the power source can be any power structure whose power magnitude can be set.

[0224] The user sets the dosage to be injected by rotating the dosage knob 2006. During dosage setting, the rotation of the dosage knob 2006 can set the driving force of the power component 2003. The actuator 2002, as an actuator, can trigger the release of the power component 2003 when pressed, providing power to the rotary feed component 2005.

[0225] Both the dosage knob 2006 and the actuator 2002 are located at the far end of the housing assembly 2001. The dosage knob 2006 is preferably fixed on the housing assembly 2001, the actuator 2002 is fixed inside the dosage knob 2006, and the dosage knob 2006 can rotate relative to the housing assembly 2001.

[0226] Depending on the type of power source, the injection device can be either an electronic or mechanical energy storage injection device. Taking an electronic energy storage device as an example, the power source can be a motor. The drive sleeve 2032 is connected to the motor shaft with a fixed transmission ratio. When the dosage knob 2006 is rotated, the stroke of the motor shaft can be set. When the actuator 2002 is pressed, the motor can be started, causing it to travel the corresponding stroke to drive the rotary feed assembly 2005. Taking a mechanical energy storage device as an example, the power source can be an elastic component, such as a compression / tension spring or a torsion spring.

[0227] In an optional embodiment, the power assembly 2003 includes a torsion spring 2031 and a drive sleeve 2032, and the rotary feed assembly 2005 includes a rotary cylinder 2051 and a screw 2052.

[0228] Specifically, as shown in Figure 39, the injection device includes a dose setting state and a dose injection state.

[0229] In the dosage setting state, the actuator 2002 is in the initial position and extends from the distal end of the housing assembly 2001. At this time, the dosage knob 2006 is anti-rotationally connected to the transmission assembly 2004, which has a cylindrical structure and is connected to the drive sleeve 2032. When the actuator 2002 is in the initial position, the transmission assembly 2004 and the drive sleeve 2032 have axially abutting stop surfaces, so that when the user rotates the dosage knob 2006 in the first direction to set the dosage of the drug to be injected, the drive sleeve 2032 can be driven to rotate synchronously in the first direction. The two ends of the torsion spring 2031 are respectively fixed to the housing assembly 2001 and the drive sleeve 2032, and the drive sleeve 2032 is rotatably axially fixed in the housing assembly 2001. Therefore, the rotation of the drive sleeve 2032 in the first direction can tension and store energy in the torsion spring 2031. In this embodiment, the "first direction" and the "second direction" are both about the central axis of the housing assembly of the injection device and are opposite to each other. Specifically, in this embodiment, the first direction is clockwise and the second direction is counterclockwise.

[0230] Furthermore, it should be noted that when the actuator 2002 is in the initial position, the transmission assembly 2004 does not establish a connection with the rotating cylinder 2051, so the rotational movement of the transmission assembly 2004 is not transmitted to the rotating cylinder 2051. Moreover, the transmission assembly 2004 also has a rotation locking mechanism with the housing assembly 2001. This mechanism allows the transmission assembly 2004 to rotate relative to the housing assembly 2001 in a first direction when driven by the dosage knob 2006. However, after the user releases the dosage knob 2006, it restricts the reverse rotation of the transmission assembly 2004 relative to the housing assembly 2001, that is, it restricts the transmission assembly 2004 from driving the knob to rotate in a second direction, thereby preventing automatic dose reversal and automatic depletion of the energy stored in the torsion spring 2031.

[0231] During the injection process, the user presses the actuator 2002, which directly or indirectly abuts against the transmission assembly 2004 in the axial direction. Therefore, when the actuator 2002 is pushed away from its initial position, it also pushes the transmission assembly 2004 axially towards the proximal end of the injection device. The transmission assembly 2004 is sleeved on the distal end of the rotating cylinder 2051, and a clutch mechanism is provided between the proximal end of the transmission assembly 2004 and the distal end of the rotating cylinder 2051. After the transmission assembly 2004 moves towards the proximal end of the injection device, the clutch mechanism engages, thereby providing an anti-rotational connection between the transmission assembly 2004 and the rotating cylinder 2051.

[0232] After the transmission assembly 2004 moves axially towards the proximal end of the injection device, the rotational locking mechanism between the transmission assembly 2004 and the housing assembly 2001 is further unlocked, allowing the transmission assembly 2004 to rotate in the opposite direction. At this time, the elastic force of the torsion spring 2031 can drive the drive sleeve 2032 to rotate in the second direction. The drive sleeve 2032 then drives the transmission assembly 2004 to rotate together in the second direction through the stop surface between it and the transmission assembly 2004. The transmission assembly 2004 is anti-rotationally connected to the rotating cylinder 2051, so the rotating cylinder 2051 also rotates in the second direction. The rotating cylinder 2051 is sleeved on the screw 2052, forming a rotary feed assembly 2005 with the screw 2052. The proximal head of the screw 2052 abuts against the syringe piston of the injection device. When the rotating cylinder 2051 rotates in the second direction, it can drive the screw 2052 to make axial displacement relative to the housing assembly 2001 towards the proximal end of the injection device, thereby pushing the piston to achieve drug delivery.

[0233] It should be noted that the process of establishing an anti-rotation connection between the transmission assembly 2004 and the rotating cylinder 2051 occurs earlier than the process of unlocking the rotation locking mechanism between the transmission assembly 2004 and the housing assembly 2001.

[0234] The proximal portion of the screw 2052 is engaged with the housing assembly 2001, while the distal portion is housed in the rotating cylinder 2051 and engaged with the inner wall of the rotating cylinder 2051.

[0235] As shown in Figure 37, the screw 2052 can typically be designed with an axially extending external thread 2521 and a stop surface 2522 on its outer surface, making the screw 5l2 a non-standard circular screw. The rotary feed assembly 2005 typically has two structural designs. In one design, the proximal end of the screw 2052 engages with a proximal stop hole in the housing assembly 2001. This stop hole engages with the stop surface 2522, preventing the screw 2052 from rotating relative to the housing assembly 2001 and allowing only axial displacement. The distal end of the screw 2052 engages with a threaded channel formed on the inner wall of the rotating cylinder 2051. Thus, when the rotating cylinder 2051 rotates, the screw 2052 can move axially relative to the housing assembly 2001. In another design, the channel formed on the inner wall of the rotating cylinder 2051 has a stop structure to limit the relative rotation of the screw 2052 while allowing relative axial displacement, and the proximal end of the housing assembly 2001 is provided as a threaded hole, so that when the rotating cylinder 2051 rotates, the screw 2052 rotates synchronously and helically displaces axially relative to the housing assembly 2001. In this specific embodiment, there are no restrictions on the two structural designs.

[0236] In this embodiment, a one-way rotation mechanism is also provided between the rotating cylinder 2051 and the housing assembly 2001. This one-way rotation mechanism only allows the rotating cylinder 2051 to rotate in the second direction, and does not allow the rotating cylinder 2051 to rotate in the opposite direction, thereby avoiding the problem of inaccurate injection accuracy caused by the retraction of the screw 2052. Specifically, this one-way rotation mechanism can be a ratchet and pawl structure, with a pawl structure provided at the proximal end of the rotating cylinder 2051 and a ratchet tooth structure provided on the housing assembly 2001. In this ratchet and pawl structure, the number of jumps of the pawl relative to the ratchet teeth is set to correspond to the set dose. For example, it can be designed to be one-to-one. When a 10-unit injection dose is set, the pawl will jump 10 ratchet teeth when the actuator 2002 is pressed for injection.

[0237] As mentioned earlier, due to manufacturing errors, assembly errors, and movement clearances, the driving force of the torsion spring 2031 may not be sufficient to rotate the rotating cylinder 2051 by an adequate angle. To avoid insufficient rotation of the rotating cylinder 2051, which could result in the actual drug injection dose being lower than the set dose, the transmission component 2004 in this embodiment is designed to be connected to the drive sleeve 2032 via a circumferential guiding structure. When the actuator 2002 presses to inject, the transmission component 2004 is not only pushed towards the proximal end of the housing assembly 2001 and rotated in the second direction by the drive sleeve 2032, but also simultaneously generates a circumferential displacement relative to the drive sleeve 2032. This circumferential displacement occurs simultaneously with or after the establishment of an anti-rotation connection between the transmission component 2004 and the rotating cylinder 2051, and the direction of the circumferential displacement is also the second direction. Therefore, during injection, the rotation angle of the transmission component 2004 relative to the housing assembly 2001 in the second direction is greater than the rotation angle of the drive sleeve 2032 relative to the housing assembly 2001 in the second direction. When the actuator 2002 is pressed to inject, the transmission component 2004 is connected to the rotating cylinder 2051 in an anti-rotational manner. Therefore, the actual rotation angle of the rotating cylinder 2051 along the second direction is greater than the angle that can be driven by the torsion spring 2031 alone. This makes up for the problem of attenuation of the driving angle transmitted from the power component 2003 to the rotating feed component 2005, so that the rotating cylinder 2051 can rotate a sufficient angle, thereby achieving the effect that the actual drug injection volume is not lower than the set dose, and improving the injection accuracy of the energy storage injection device.

[0238] In this embodiment, as shown in Figures 38 and 39, the transmission assembly 2004 may specifically include a sound-emitting cylinder 2041 and a biasing cylinder 2042. The sound-emitting cylinder 2041 is fitted inside the drive sleeve 2032, and the biasing cylinder 2042 is fitted inside the sound-emitting cylinder 2041 and outside the distal end of the rotating cylinder 2051. The distal end of the biasing cylinder 2042 radially protrudes to form a shoulder surface and abuts against the radially protruding distal end face of the inner wall of the sound-emitting cylinder 2041. Therefore, when the actuator 2002 is pressed, it can push the sound-emitting cylinder 2041 and the biasing cylinder 2042 together axially towards the proximal end of the injection device.

[0239] As shown in Figures 38 and 40, an axially extending first stop groove 2413 is formed on the protruding end face of the inner wall of the sound-emitting tube 2041, and an axially extending first stop portion 2414 is formed on the outer surface of the sound-emitting tube 2041. A circumferentially extending second stop groove 2322 is formed inside the drive sleeve 2032, and a protruding second stop portion 2421 is formed on the outer surface of the biasing tube 2042. Furthermore, a first clutch tooth 2422 is formed on the distal inner wall of the biasing tube 2042, and a second clutch tooth 2423 is formed on the proximal inner wall. The outer part of the dosage knob 2006 is a cylindrical operating part 2061, and an axially extending cylindrical connecting part 2062 is formed inside the operating part 2061. A first clutch groove 2621 is formed on the outer wall of the connecting part 2062. A second clutch groove 2511 is formed on the distal outer wall of the rotating tube 2051. The side end face of the first stop groove 2413 abuts against the corresponding side end face of the second stop portion 2421, and the side end face of the first stop portion 2414 abuts against the corresponding side end face of the second stop groove 2322.

[0240] As shown in Figure 39, when the actuator 2002 is in its initial position, the first clutch groove 2621 and the first clutch tooth 2422 are engaged, and the bias cylinder 2042 and the dosage knob 2006 are anti-rotationally connected. Meanwhile, the second clutch groove 2511 and the second clutch tooth 2423 are disengaged, allowing the bias cylinder 2042 to rotate relative to the rotating cylinder 2051. Therefore, when the user rotates the dosage knob 2006 in the first direction to set the dosage, the bias cylinder 2042 is driven to rotate along with the dosage knob 2006. This rotation, combined with the contact between the first stop groove 2413 and the second stop portion 2421, pushes the sound-emitting cylinder 2041 to rotate in the first direction. After the sound-emitting cylinder 2041 rotates, the contact between the first stop portion 2414 and the second stop groove 2322 pushes the drive sleeve 2032 to rotate synchronously in the first direction, thereby tensioning and storing energy in the torsion spring 2031.

[0241] When actuator 2002 is pressed down, it also pushes bias cylinder 2042 to move distally. At this time, the first clutch tooth 2422 gradually disengages from the first clutch groove 2621, while the second clutch tooth 2423 and the second clutch groove 2511 gradually approach to establish engagement. This causes bias cylinder 2042 to disengage from the dosage knob 2006 and establish a rotational locking state with rotating cylinder 2051. It should be noted that the process of the second clutch tooth 2423 and the second clutch groove 2511 establishing engagement occurs earlier than the process of the first clutch tooth 2422 disengaging from the first clutch groove 2621.

[0242] At this time, when the sound-emitting cylinder 2041 is driven to rotate in the second direction by the drive sleeve 2032 through the contact of the first stop 2414 and the second stop groove 2322, the sound-emitting cylinder 2041 can push the bias cylinder 2042 to rotate in the second direction together by means of the contact of the first stop groove 2413 and the second stop 2421. The rotation of the bias cylinder 2042 in the second direction, through the engagement of the second clutch tooth 2423 and the second clutch groove 2511, drives the rotating cylinder 2051 to rotate synchronously in the second direction, thereby realizing drug delivery.

[0243] As shown in Figures 40, 41 and 43, in this embodiment, the transmission component 2004 is sleeved inside the drive sleeve 2032, and one of the outer surface of the transmission component 2004 and the inner surface of the drive sleeve 2032 is provided with a lateral protrusion 2411, and the other is provided with a guide rail 2321. The transmission component 2004 is connected to the drive sleeve 2032 by means of the cooperation between the lateral protrusion 2411 and the guide rail 2321.

[0244] It should be noted that the component in the transmission assembly 2004 that is connected to the drive sleeve 2032 via a circumferential guiding structure can be either the sound-emitting cylinder 2041 or the biasing cylinder 2042. In the following specific embodiment, the connection structure between the transmission assembly 2004 and the drive sleeve 2032 will be described using the sound-emitting cylinder 2041 as an example.

[0245] As shown in Figure 43, the guide rail 2321 can be specifically disposed on the spring sleeve 32, including a circumferentially offset inclined groove section at both ends and a straight groove section at the distal end. A lateral protrusion 2411 can be disposed on the sound-emitting tube 2041. For ease of assembly, an axially extending spring arm 2412 can be formed at the proximal end of the sound-emitting tube 2041, and the lateral protrusion 2411 can be disposed at the end of the spring arm 2412. During assembly, the spring arm 2412 can be bent radially inward to facilitate the fitting of the sound-emitting tube 2041 into the spring sleeve 32. Furthermore, the closed ends of the guide rail 2321 also prevent the sound-emitting tube 2041 from detaching from the connection of the spring sleeve 32.

[0246] Furthermore, the lateral protrusion 2411 has a distal end face, a proximal end face, a left straight face, a right straight face, a first inclined surface 411a between the left straight face and the distal end face, and a second inclined surface 411b between the right end face and the distal end face. The distal end of the guide rail 2321 has an axially extending vertical end face 321a, and the proximal end has a stop end face 321b. An inclined rail end face is formed between the distal end and the proximal end of the guide rail 2321.

[0247] As shown in Figure 43, when button 2 is in its initial position, as shown in state A in Figure 43, the sound tube 2041 is located at the far end of the guide rail 2321, and the right straight surface of the lateral protrusion 2411 abuts against the vertical end face 321a of the guide rail 2321. At this time, when the dosage knob 2006 rotates in the second direction, the dosage can be adjusted back, that is, the set drug dosage is reduced. When the sound tube 2041 is driven to rotate in the second direction by the dosage knob 2006, the spring sleeve 32 can be driven to rotate synchronously by the contact between the right straight surface of the lateral protrusion 2411 and the vertical end face 321a of the guide rail 2321, thereby reducing the energy stored in the torsion spring 2031.

[0248] When the injection dose is injected by pressing button 2, as shown in state B of Figure 43, the sound-emitting tube 2041 moves axially towards the proximal end of the housing assembly 2001 as the bias tube 2042 is pushed by button 2. At this time, the right straight surface of the lateral protrusion 2411 is axially displaced and disengaged from the vertical end face 321a of the guide rail 2321 under the guidance of the straight groove section. The first inclined surface 411a gradually approaches the inclined surface of the rail until they abut against each other. After they abut against each other, as shown in state C of Figure 43, the sound-emitting tube 2041 slides relative to the inclined surface of the rail by means of the first inclined surface 411a, thereby making a circumferential displacement relative to the spring sleeve 32 in the second direction until the proximal end face of the lateral protrusion 2411 moves to the proximal end of the guide rail 2321 and abuts against the stop end face 321b of the guide rail 2321, thereby stopping the circumferential displacement in the guide rail 2321.

[0249] In this embodiment, the injection device further includes a return spring 2008, which is disposed between the axial end faces of the sound-emitting cylinder 2041 and the drive sleeve 2032. When the actuator 2002 is pressed, the sound-emitting cylinder 2041 is axially displaced relative to the drive sleeve 2032 and undergoes a helical motion relative to the drive sleeve 2032 in a second direction. During this process, the return spring 2008 is compressed and stores energy. After the injection is completed, the user releases the actuator 2002. At this time, the compressed return spring 2008 can push the sound-emitting cylinder 2041 to move towards the distal end of the injection device. During this process, as shown in state D of Figure 43, by means of the sliding of the second inclined surface 411b relative to the inclined surface of the track, the drive sleeve 2032 makes a spiral motion in the first direction until the distal end face of the lateral protrusion 2411 moves to the distal end of the guide rail 2321 and abuts against the distal end face of the guide rail 2321, thereby stopping the spiral motion in the guide rail 2321 and resetting.

[0250] In this embodiment, the injection device further includes a ratchet component 2007, which is disposed between the actuator 2002 and the sound-emitting tube 2041. The distal end of the sound-emitting tube 2041 and the proximal end of the ratchet component 2007 are connected by a one-way rotation structure. The ratchet component 2007 is provided with a third clutch tooth, and the housing assembly 2001 has a third clutch groove. Furthermore, the actuator 2002 abuts against the ratchet component 2007. This abutment can be direct contact between the actuator 2002 and the ratchet component 2007 or indirect contact through an intermediate component, so that when the actuator 2002 is pressed, the thrust can be transmitted to the sound-emitting tube 2041. When the actuator 2002 is pressed, the third clutch tooth disengages from the third clutch groove, allowing the transmission assembly 2004 to rotate relative to the housing assembly 2001.

[0251] Specifically, the inner end face of the actuator 2002 extends towards the proximal end of the housing assembly 2001 to form a cylindrical portion, which abuts against the ratchet member 2007. The distal end of the sound-emitting tube 2041 is provided with a first one-way ratchet 2415, and the proximal end of the ratchet member 2007 is provided with a second one-way ratchet. Both the first one-way ratchet 2415 and the second one-way ratchet can be designed as right-angled triangular teeth. The distal end of the ratchet member 2007 is provided with a third clutch tooth, and the distal end of the housing assembly 2001 is provided with a third clutch groove. The return spring 2008 pushes the sound-emitting tube 2041, causing the first one-way ratchet 2415 on the sound-emitting tube 2041 to maintain elastic engagement with the second one-way ratchet on the ratchet member 2007.

[0252] When the actuator 2002 is in the initial position, the third clutch tooth and the third clutch groove remain engaged, preventing the ratchet 2007 from rotating relative to the housing assembly 2001. Thus, when the user rotates the dosage knob 2006 in the first direction to set the dosage, the sound tube 2041 can rotate relative to the ratchet 2007 in the first direction, thereby driving the drive sleeve 2032 to rotate in the first direction to store energy in the torsion spring 2031. During rotation, the first one-way ratchet 2415 can emit a "click" sound through the jumping engagement of the second one-way ratchet, providing feedback to the user on the dosage setting operation. Furthermore, after the user releases their grip, the first one-way ratchet 2415 and the second one-way ratchet are engaged, as are the third clutch tooth and the third clutch groove. By means of the right-angled triangular tooth shape and right-angled side tooth shape of the first one-way ratchet 2415 and the second one-way ratchet in the engaged state, the sound tube 2041 cannot rotate in the opposite direction relative to the ratchet component 2007, that is, it cannot rotate in the second direction relative to the housing assembly 2001, thereby maintaining the energy storage state of the torsion spring 2031.

[0253] After the actuator 2002 is pressed, the ratchet 2007, the sound-emitting cylinder 2041, and the biasing cylinder 2042 are all pushed towards the proximal end of the housing assembly 2001. At this time, the third clutch tooth and the third clutch groove gradually disengage, allowing the sound-emitting cylinder 2041 to rotate relative to the housing assembly 2001 in the second direction. Simultaneously, the spring force of the torsion spring 2031, via the drive sleeve 2032, drives the sound-emitting cylinder 2041, the ratchet 2007, and the biasing cylinder 2042 to rotate together in the second direction. The biasing cylinder 2042 then drives the rotating cylinder 2051 to rotate synchronously, thereby achieving drug delivery via injection.

[0254] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A clutch assembly, characterized in that, The clutch assembly has an engaged state and an disengaged state.

2. The clutch assembly according to claim 1, characterized in that, The clutch assembly includes a knob, a ratchet, an offset device, a sound-emitting plate, an elastic element, and a scale lever; The ratchet has ratchet teeth on the side opposite to the knob; The biasing device is used to link with the knob and includes a main body and a connecting platform provided at one end of the main body. The connecting platform is provided with a first inclined surface. The sound-generating plate has a helical tooth at one end along its axial direction, which meshes with the ratchet tooth; the sound-generating plate also has a second inclined surface, which is located inside the helical tooth and fits against the first inclined surface; The elastic element is disposed between the sound-emitting plate and the scale rod; The scale rod is linked to the sound-emitting plate; The sound-producing plate and the ratchet have an engaged state and a disengaged state. Initially, the elastic element is in a compressed state, and the sound-producing plate is pushed by the elastic element, causing the helical teeth to engage with the ratchet teeth, which is the engaged state. When the knob is rotated in the first direction, the first inclined surface of the biasing device presses against the second inclined surface of the sound-producing plate, causing the sound-producing plate to move axially and press against the elastic element. The helical teeth disengage from the ratchet teeth, thereby causing the ratchet to disengage from the sound-producing plate, which is the disengaged state.

3. The clutch assembly according to claim 2, characterized in that, The connecting platform is also provided with a plurality of protrusions arranged at intervals, and the plurality of protrusions form a stop position; the sound-emitting plate is also provided with a plurality of abutment posts arranged at intervals, the abutment posts being coaxially arranged with the second inclined surface, and the abutment posts being located within the stop position.

4. The clutch assembly according to claim 2, characterized in that, The knob is a housing with one end open. A protrusion is provided on the end face of the housing opposite to the opening along the axial direction. A receiving space is formed between the protrusion and the housing. A connecting key is provided on the outer wall of the protrusion.

5. The clutch assembly according to claim 4, characterized in that, The outer wall of the knob is also provided with a threaded structure.

6. The clutch assembly according to claim 5, characterized in that, The main body is a hollow cylinder, and a connecting groove is provided on the inner wall of the main body. The connecting groove is used to connect with the connecting keyway.

7. The clutch assembly according to claim 6, characterized in that, The external dimensions of the protrusion are smaller than the inner diameter of the body, and part of the protrusion extends into the body.

8. The clutch assembly according to claim 4, characterized in that, The ratchet is hollow in the middle, and the protrusion passes through the middle of the ratchet, with the ratchet housed within the receiving space.

9. The clutch assembly according to claim 2, characterized in that, The other end of the sound-emitting sheet is hollow to form a second receiving space, and part of the elastic element is received in the second receiving space.

10. The clutch assembly according to claim 2, characterized in that, The elastic element is a spring.

11. The clutch assembly according to claim 2, characterized in that, The sound-emitting plate is provided with an elastic reset part, and the biasing device is provided with a top abutting part. The elastic reset part is used to abut against the top abutting part.

12. A dosage setting device, characterized in that, The dosage setting device includes a knob, a housing, a clutch assembly, a dosage range setting element, a scale rod, an energy storage element, and a mounting base; The knob can rotate in both directions and is used to coordinate with the clutch assembly; The outer casing is hollow inside, and is used to accommodate the clutch assembly, the dosage setting element, the scale rod, the energy storage device, and the mounting base; The clutch assembly has an engaged state and a disengaged state; The dosage range setting element is linked to the scale lever to limit the range of rotation of the knob; The scale rod is linked to the clutch assembly and is used to store energy in the energy storage device; One end of the energy storage device is connected to the scale rod, and the other end is fixed to the mounting base; When the clutch assembly is engaged, the knob rotates in the first direction, and the energy storage element stores energy; when the knob rotates in the second direction, the clutch assembly switches between the engaged and disengaged states, and the energy storage element releases energy.

13. The dosage setting device according to claim 12, characterized in that, The clutch assembly includes a ratchet, a biasing device, a sound-emitting plate, and an elastic element; The ratchet has ratchet teeth on the side opposite to the knob; The biasing device is used to link with the knob and includes a main body and a connecting platform provided at one end of the main body. The connecting platform is provided with a first inclined surface. The sound-generating plate has a helical tooth at one end along its axial direction, which meshes with the ratchet tooth; the sound-generating plate also has a second inclined surface, which is located inside the helical tooth and fits against the first inclined surface; The elastic element is disposed between the sound-emitting plate and the scale rod; The scale rod is linked to the sound-emitting plate; The sound-producing plate and the ratchet have an engaged state and a disengaged state. Initially, the elastic element is in a compressed state, and the sound-producing plate is pushed by the elastic element, causing the helical teeth to engage with the ratchet teeth, which is the engaged state. When the knob is rotated in the second direction, the first inclined surface of the biasing device presses against the second inclined surface of the sound-producing plate, causing the sound-producing plate to move axially and press against the elastic element. The helical teeth disengage from the ratchet teeth, thereby causing the ratchet to disengage from the sound-producing plate, which is the disengaged state.

14. The dosage setting device according to claim 13, characterized in that, The connecting platform is also provided with a plurality of protrusions arranged at intervals, and the plurality of protrusions form a stop position; the sound-emitting plate is also provided with a plurality of abutment posts arranged at intervals, the abutment posts being coaxially arranged with the second inclined surface, and the abutment posts being located within the stop position.

15. The dosage setting device according to claim 13, characterized in that, The knob is a housing with one end open. A protrusion is provided on the end face of the housing opposite to the opening along the axial direction. A receiving space is formed between the protrusion and the housing. A connecting key is provided on the outer wall of the protrusion.

16. The dose setting device according to claim 15, characterized in that The main body is a hollow cylinder, and a connecting groove is provided on the inner wall of the main body. The connecting groove is used to connect with the connecting keyway.

17. The dose setting device according to claim 16, characterized in that The ratchet is hollow in the middle, and the protrusion passes through the middle of the ratchet, with the ratchet housed within the receiving space.

18. The dose setting device of claim 13, wherein The dosage range setting element includes a fixed base and a scale ring. Both the fixed base and the scale ring are sleeved outside the scale rod. The ratchet is connected to the fixed base by teeth. The inner wall of the scale ring is connected to the keyway of the scale rod. The outer wall of the scale ring is threaded to the outer shell.

19. The dose setting device according to claim 18, characterized in that The outer wall of the mounting base is provided with a first stop protrusion, and the end of the scale ring opposite to the mounting base is provided with a second stop protrusion. When the first stop protrusion and the second stop protrusion are in contact, the scale ring cannot rotate relative to the mounting base in the second direction. The fixed base has a third stop protrusion on the end opposite to the scale ring, and the scale ring has a fourth stop protrusion on the end opposite to the fixed base. When the knob is rotated in the first direction, the scale ring is driven to rotate by the scale rod until the fourth stop protrusion abuts against the third stop protrusion. At this time, the scale ring can no longer rotate in the first direction.

20. The dose setting device according to claim 19, characterized in that The inner wall of the outer casing is provided with a first thread, and the outer wall of the scale ring is provided with a matching second thread; the outer casing is also provided with a scale window, and the outer wall of the scale ring is provided with scale marks, the scale marks corresponding to the scale window.

21. An injection device, characterized in that The injection device includes the dosage setting device as described in any one of claims 12-20.

22. An injection device, characterized in that, include: Transmission mechanism, rotary feed assembly and power source; The transmission mechanism includes: Actuator, drive sleeve and transmission assembly; The transmission assembly is connected to the drive sleeve via a circumferential guiding structure; When the actuator is pressed, the transmission assembly, under the thrust of the actuator, can generate a circumferential displacement relative to the drive sleeve by means of the circumferential guiding structure. The drive sleeve is connected to the power source via a transmission connection; The power source is used to set the driving force during dose setting and to provide power to the rotary feed assembly using the driving force during injection; The rotary feed assembly includes a rotary cylinder and a screw; The transmission assembly is slidably sleeved on the outside of the rotating cylinder; When the actuator is pressed, it first pushes the transmission assembly to move axially until an anti-rotation connection is established between the transmission assembly and the rotating cylinder. Then, with the help of the circumferential guiding structure and under the thrust of the actuator, the transmission assembly generates the circumferential displacement relative to the drive sleeve. The circumferential displacement causes the rotating cylinder to rotate in the same direction, and the rotation of the rotating cylinder in the same direction drives the screw to feed axially. The injection device also includes a ratchet assembly, a dosage knob, and a torsion spring; the transmission assembly includes a sound-emitting tube; the distal end of the sound-emitting tube is provided with a first one-way ratchet, and the proximal end of the ratchet assembly is provided with a second one-way ratchet; the injection device also includes a return spring; the return spring is used to push the sound-emitting tube so that the first one-way ratchet on the sound-emitting tube is elastically engaged with the second one-way ratchet on the ratchet assembly; when the dosage knob is rotated in the first direction, the sound-emitting tube rotates relative to the ratchet assembly in the first direction, driving the drive sleeve to rotate in the first direction to store energy in the torsion spring.

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