Dose setting device and injection device

Abstract

The utility model discloses a kind of dose setting device and injection device, wherein dose setting device includes knob, shell, clutch assembly, dose interval setting element, scale rod, energy storage piece and mounting seat;Knob can be bidirectional rotation, for clutch assembly linkage;Shell is hollow inside, for accommodating clutch assembly, dose interval setting element, scale rod, energy storage piece and mounting seat;Clutch assembly has engagement state and separation state;Dose interval setting element is linked with scale rod, for limiting the interval of knob rotation;Scale rod is linked with clutch assembly, for energy storage piece is energized;Energy storage piece one end is connected with scale rod, the other end is fixed on mounting seat.The dose setting device and injection device of the utility model rotate knob can realize dose setting and recall, use the one-way tooth of clutch assembly and slope structure cooperation rotation, dose setting positive adjustment, one-way tooth sliding, dose setting recall, slope sliding, movement is stable, feedback is obvious.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to 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, the injection device allows users to set the injection dosage. When the dosage needs to be corrected, it is adjusted through the clutch component. The current dosage setting device has a complex structure and is inconvenient to use. It requires the cooperation of multiple components to achieve dosage setting. The engagement and disengagement are unstable and the feedback is not obvious. Utility Model Content

[0004] The main technical problem solved by this utility model is to provide a dosage setting device and an injection device. The dosage can be set and adjusted by rotating the knob. The one-way teeth of the clutch component cooperate with the inclined plane structure to rotate. When the dosage is set forward, the one-way teeth slide between them. When the dosage is adjusted back, the inclined plane slides between them. The movement is stable and the feedback is obvious, avoiding all or some of the above defects.

[0005] To solve the above-mentioned technical problems, the present invention provides a dosage setting device, which includes a knob, a housing, a clutch assembly, a dosage range setting element, a scale rod, an energy storage element, and a mounting base.

[0006] The knob can rotate in both directions and is used to coordinate with the clutch assembly;

[0007] 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;

[0008] The clutch assembly has an engaged state and a disengaged state;

[0009] The dosage range setting element is linked to the scale lever to limit the range of rotation of the knob;

[0010] The scale rod is linked to the clutch assembly and is used to store energy in the energy storage device;

[0011] One end of the energy storage device is connected to the scale rod, and the other end is fixed to the mounting base;

[0012] 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.

[0013] The clutch assembly includes a ratchet, a biasing device, a sound-emitting plate, and an elastic element;

[0014] The ratchet has ratchet teeth on the side opposite to the knob;

[0015] 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.

[0016] 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;

[0017] The elastic element is disposed between the sound-emitting plate and the scale rod;

[0018] The scale rod is linked to the sound-emitting plate;

[0019] 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.

[0020] The connecting platform is provided with a plurality of protrusions arranged at intervals, and the plurality of protrusions form a stop position; the sound-emitting plate is 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.

[0021] The knob is a housing with one open end. 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.

[0022] 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.

[0023] The ratchet is hollow in the middle, the protrusion passes through the middle of the ratchet, and the ratchet is accommodated in the accommodating space.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] To address the technical problem, this application also provides an injection device, which includes the dosage setting device described in any of the above claims.

[0029] Compared with the prior art, the beneficial effects of the dosage setting device and injection device of this utility model are as follows: the dosage can be set and adjusted by rotating the knob, and 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, and when the dosage is adjusted back, the inclined surfaces slide between them. The movement is stable and the feedback is obvious. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is an exploded structural diagram of the dosage setting device of this utility model;

[0032] Figure 2 This is a schematic diagram of the dosage setting device of this utility model when it is located at the minimum end of the dosage range;

[0033] Figure 3 This is a schematic diagram of the dosage setting device of this utility model when it is located at the maximum end of the dosage range;

[0034] Figure 4 This is a schematic diagram of the clutch assembly in the engaged state;

[0035] Figure 5 yes Figure 4 Enlarged view of part A in the middle;

[0036] Figure 6 This is a schematic diagram of the clutch assembly in the disengaged state;

[0037] Figure 7 yes Figure 6 Enlarged view of part B in the middle;

[0038] Figure 8 This is a schematic diagram of the knob's structure;

[0039] Figure 9 This is a schematic diagram of the ratchet mechanism;

[0040] Figure 10 This is a schematic diagram of the bias circuit.

[0041] Figure 11 This is a cross-sectional view of the biaser;

[0042] Figure 12 This is a schematic diagram of the sound-generating plate;

[0043] Figure 13 This is a schematic diagram of the scale rod;

[0044] Figure 14 This is a structural diagram of the mounting base;

[0045] Figure 15 This is a structural schematic diagram of the outer shell from a first-person perspective;

[0046] Figure 16 This is a structural schematic diagram of the outer shell from a second perspective;

[0047] Figure 17 This is a structural diagram of the fixed base;

[0048] Figure 18 This is a schematic diagram of the scale ring from a first-person perspective;

[0049] Figure 19 This is a schematic diagram of the scale ring from a second perspective. Detailed Implementation

[0050] The technical solutions of the present utility model 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 utility model, and not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0051] In this embodiment of the invention, all directional indicators (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 indicators 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.

[0052] 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.

[0053] Please see Figures 1 to 19 , Figure 1 This is an exploded structural diagram of the dosage setting device of this utility model. The dosage setting device includes a knob 1, a housing 9, a clutch assembly, a dosage range setting element, a scale rod 6, an energy storage element 7, and a mounting base 8.

[0054] 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.

[0055] 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.

[0056] The clutch assembly has an engaged state and an disengaged state.

[0057] 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.

[0058] The scale lever 6 is linked with the clutch assembly to store energy in the energy storage component 7.

[0059] 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.

[0060] 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.

[0061] The clutch assembly in this application includes a ratchet 2, an offset 3, a sound-emitting plate 4, and an elastic element 5;

[0062] Knob 1 is hollow inside and is used to drive the bias device 3 to rotate.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] Based on the above structure, the sound-generating plate 4 and the ratchet 2 have a meshing state and a disengaged state, such as... Figures 4 to 7 As shown, initially, the elastic element 5 is in a compressed state, and the sound-generating 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-generating 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 remains stationary, and the biasing device 3 drives the sound-generating plate 4 to rotate clockwise relative to the ratchet 2. The helical tooth 41 of the sound-generating plate 4 moves axially downward relative to the ratchet tooth 21 of the ratchet 2. After the helical tooth 41 passes over a ratchet tooth 21, the two briefly separate. Then, the sound-generating 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-generating plate 4 rotates one tooth clockwise relative to the ratchet 2, and after rotation, the two continue to mesh. The sound-generating plate 4 drives the scale rod 6, and the scale rod 6 drives the energy storage device 7 to rotate to store energy. The clockwise rotation of the knob 1 completes the energy storage action of the energy storage device 7. When rotated to the preset position, the energy storage component 7, after storing energy, 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 fixed, and the counterclockwise rotation tendency of the sound-generating plate 4 is blocked.

[0071] 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.

[0072] 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, and 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, and the counterclockwise rotation is blocked by the ratchet 2. 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. Figure 8 As shown. After the sound-generating plate 4 and ratchet 2 separate, 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 ratchet 2 return to the 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.

[0073] 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.

[0074] 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.

[0075] In one embodiment, both the protrusion 322 and the abutment post 43 are cubes or cuboids.

[0076] Please refer to Figure 2As shown, in this application, the knob 1 is a housing 11 with one end open and an end face on the other end opposite to the opening. 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.

[0077] In one embodiment, the housing 11 is a hollow cylinder with one end open, and the cross-section of the protrusion 12 is annular.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] 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.

[0082] In this application, the elastic element 5 is a spring, which has a simple structure and low cost.

[0083] 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 along 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.

[0084] 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.

[0085] 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.

[0086] 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.

[0087] In the initial state, such as Figure 2 As shown, when the scale ring 30 is at its lowest point, 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 be rotated counterclockwise, meaning the dosage cannot be reduced further. When the knob 1 is rotated clockwise, the scale ring 30 is driven by the scale rod 6 and guided upwards by the outer casing 9 in a spiral motion until the fourth stop protrusion 302 at the upper part abuts against the third stop protrusion 201 of the mounting base 20. The knob 1 can no longer be rotated. Figure 3As shown, 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 the aforementioned space. As described earlier, when the knob 1 is rotated clockwise, the energy storage element 7 stores energy, which can then be released to inject the drug. Rotating the knob 1 to any position within the single injection dosage range sets the injection dosage. The energy stored in the energy storage element 7 and the single injection dosage are proportional to the axial distance of this rotation.

[0088] like Figure 15 and Figure 16 As shown, 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 driven to rotate by the scale rod 6, it is guided to move spirally by the first thread 91 of the outer casing 9. 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.

[0089] 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.

[0090] Using the dosage setting device and injection device of this utility model, the dosage can be set and adjusted by rotating the knob. The one-way teeth of the clutch component cooperate with the inclined plane structure to rotate. When the dosage is set forward, the one-way teeth slide between them. When the dosage is adjusted back, the inclined plane slides between them. The movement is stable and the feedback is obvious.

[0091] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. 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.

2. The dosage setting device according to claim 1, 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.

3. The dosage setting device 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 dosage setting device 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 dosage setting device according to claim 4, 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.

6. The dosage setting device according to claim 5, 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.

7. The dosage setting device according to claim 2, characterized in that, 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.

8. The dosage setting device according to claim 7, 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.

9. The dosage setting device according to claim 8, 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.

10. An injection device, characterized in that, The injection device includes the dosage setting device as described in any one of claims 1-9.

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