Injection device with feedback function
Through the cooperation of the ratchet tooth ring and the ratchet arm, the injection device generates acoustic and tactile signals, which solves the problem of insufficient feedback during dose setting and ensures that the user clearly understands the dose setting action.
Patent Information
- Application Number
- CN202422069697.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-23
- Publication Date
- 2025-10-28
- Estimated Expiration
- 2034-08-23
AI Technical Summary
Existing injection devices lack clear feedback during dose setting, causing users to be unsure whether the dose setting action is performed properly.
An injection device with feedback function is used, which generates acoustic signals and/or tactile signals through the cooperation of the ratchet ring and the ratchet arm to prompt the user to increase or decrease the dose.
Provide clear acoustic and/or tactile cues during dose setting to ensure the user understands the progress of the dose setting action.
Smart Images
Figure CN223474216U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of injection devices, and in particular to an injection device with feedback function. Background Technology
[0002] When injecting medication, a specific injection device is used. This device is usually called a pen injector or injection pen, which allows the user to set the dosage according to their needs and inject the set dosage. However, when the user sets the dosage according to their needs, they are often unsure whether the dosage setting action is being performed correctly. Therefore, it is necessary to provide an injection device with feedback function during dosage setting to provide the user with clearer prompts. Utility Model Content
[0003] In order to provide feedback during dosage setting and to provide clearer prompts to the user, this application provides an injection device with feedback functionality.
[0004] The injection device with feedback function provided in this application adopts the following technical solution:
[0005] An injection device with feedback function includes: a housing having a first axis; a scale element rotatable relative to the housing about the first axis for dose setting, the scale element having a ratchet ring on its sidewall; a transmission element passing through the scale element and rotatable about the first axis, the transmission element having an axially extending first engagement tooth; a feedback element disposed between the scale element and the transmission element, the feedback element having a ratchet arm on its sidewall for engaging with the ratchet ring, the feedback element having a second engagement tooth for engaging with the first engagement tooth; the feedback element is movable relative to the transmission element from a first engagement position to a proximal position; when the feedback element is in the first engagement position, the first engagement tooth engages with the second engagement tooth, and when the feedback element is in the second engagement position... The first meshing tooth is separated from the second meshing tooth; an elastic element is provided to provide elastic resistance for the feedback element to move from the first engagement position to the second engagement position; wherein, during dose increase, the feedback element is in the first engagement position to prevent the feedback element from rotating relative to the transmission element, and the scale element rotates relative to the feedback element to generate a first acoustic signal and / or a first tactile signal between the ratchet ring and the ratchet arm; during dose decrease, the ratchet arm engages with the ratchet ring to prevent the scale element from rotating relative to the feedback element, and the feedback element is reciprocating between the first engagement position and the second engagement position to cause the feedback element to rotate relative to the transmission element, and to generate a second acoustic signal and / or a second tactile signal between the first meshing tooth and the second meshing tooth.
[0006] By employing the above technical solution, the user sets the dosage by rotating the scale element relative to the housing. During dosage increase, the feedback element and the transmission element are locked in the rotation direction, while the scale element and the feedback element rotate relative to each other, causing the ratchet tooth ring and ratchet arm to misalign, generating a first acoustic signal and / or a first tactile signal to indicate to the user that the dosage increase action is in progress. Correspondingly, during dosage decrease, the scale element and the feedback element are locked in the rotation direction, while the feedback element and the transmission element rotate relative to each other, and under the action of the elastic element, the first meshing tooth and the second meshing tooth misalign, generating a second acoustic signal and / or a second tactile signal to indicate to the user that the dosage decrease action is in progress. In summary, this solution can generate acoustic signals and / or tactile information during dosage setting, thereby providing the user with a prompt that the dosage setting action is in progress.
[0007] Furthermore, the feedback element is configured with two ratchet arms, which are centrally symmetrically distributed with respect to the central axis of the feedback element.
[0008] By adopting the above technical solution, the centrally symmetrically distributed ratchet arms can better maintain the centered position of the feedback element in the scale element, thereby reducing the possibility that the feedback element will affect the feedback effect due to deviation from the center position.
[0009] Furthermore, the ratchet ring has ratchet tooth grooves arranged in a circumferential direction, and the ratchet arm includes an arc-shaped spring arm and a pawl at the free end of the arc-shaped spring arm, the pawl being able to engage with the ratchet tooth grooves; the ratchet tooth grooves have a first groove wall and a second groove wall opposite each other in a circumferential direction, and the pawl has a first side wall and a second side wall opposite each other in a circumferential direction; both the first side wall and the first groove wall are inclined surfaces, and during dose adjustment, the first side wall abuts against the first groove wall and slides against each other as they continue to approach; during dose adjustment, the second side wall abuts against the second groove wall and prevents them from approaching each other further.
[0010] Furthermore, if the dose set by the rotation of the scale element relative to the transmission element for one revolution is defined as X unit doses, then the number of ratchet tooth grooves arranged in the circumferential direction is X.
[0011] Furthermore, the first meshing teeth are arranged circumferentially along the transmission element to form a meshing tooth ring, and a meshing tooth groove is formed between two adjacent first meshing teeth for the second meshing teeth to engage. The meshing tooth groove has opposing third groove walls and fourth groove walls, and the second meshing teeth have opposing third side walls and fourth side walls. During dose increase, the third side wall abuts against the third groove wall and prevents them from getting closer. The fourth side wall and the fourth groove wall are both inclined surfaces, and during dose decrease, the fourth side wall abuts against the fourth groove wall and slides against each other as they get closer.
[0012] Furthermore, the transmission element has a positioning groove at its proximal end, and the first meshing tooth is located at the bottom of the positioning groove; the feedback element includes a main body, the distal end of which can extend into the positioning groove, and the second meshing tooth is located at the distal end of the main body.
[0013] Furthermore, the main body is provided with an axial through hole, the positioning groove is provided with an axial protrusion that can extend into the axial through hole, the outer wall of the axial protrusion is spaced from the inner wall of the axial through hole, and the side wall of the axial protrusion is provided with an abutting part for abutting against the inner wall of the axial through hole.
[0014] Furthermore, the elastic element is configured as a linear spring extending axially, and the elastic element is sleeved on the proximal end of the body.
[0015] Furthermore, the injection device also includes a push element that is movable relative to the scale element from a first position to a second position; an elastic element is located between the feedback element and the push element, and the elastic element is used to provide elastic resistance to the push element moving from the first position to the second position; during dose setting, the push element is in the first position and allows the feedback element to move from the first mating position to the second mating position; during dose injection, the push element is in the second position and prevents the feedback element from moving from the first mating position to the second mating position.
[0016] Furthermore, the distal end of the pushing element is housed in the proximal end of the scale element, and the outer side wall of the pushing element is provided with a first stop portion, and the inner side wall of the scale element is provided with a second stop portion. When the pushing element is in the first position, the proximal end of the first stop portion abuts against the distal end of the second stop portion.
[0017] In summary, this application includes the following beneficial technical effects: The user sets the dosage by rotating the scale element relative to the housing. During dosage increase, the feedback element and the transmission element are locked in the rotation direction, while the scale element and the feedback element rotate relative to each other, causing the ratchet tooth ring and ratchet arm to misalign, generating a first acoustic signal and / or a first tactile signal to indicate to the user that the dosage increase action is in progress. Correspondingly, during dosage decrease, the scale element and the feedback element are locked in the rotation direction, while the feedback element and the transmission element rotate relative to each other, and under the action of the elastic element, the first meshing tooth and the second meshing tooth misalign, generating a second acoustic signal and / or a second tactile signal to indicate to the user that the dosage decrease action is in progress. In summary, this solution can generate acoustic signals and / or tactile information during dosage setting, thereby providing the user with clearer prompts. Attached Figure Description
[0018] Figure 1 This is a cross-sectional schematic diagram of the injection device in an embodiment of this application;
[0019] Figure 2 This is a partial cross-sectional schematic diagram used to illustrate the dispensing mechanism and the feedback mechanism in the embodiments of this application;
[0020] Figure 3 This is an exploded schematic diagram used to illustrate the dispensing mechanism and the feedback mechanism in the embodiments of this application;
[0021] Figure 4 This is a partial schematic diagram used to illustrate the transmission element in an embodiment of this application;
[0022] Figure 5 This is a schematic diagram used to demonstrate the feedback element in the embodiments of this application. Figure 1 ;
[0023] Figure 6 This is a schematic diagram of the embodiment of the present application showing the ratchet ring by hiding the sidewall of the scale element;
[0024] Figure 7 This is a schematic diagram used to demonstrate the feedback element in the embodiments of this application. Figure 2 .
[0025] Explanation of reference numerals in the attached drawings: 1. Housing; 2. Scale element; 21. Countersunk groove; 22. Ratchet ring; 23. Ratchet tooth groove; 231. First groove wall; 232. Second groove wall; 24. Second stop; 3. Transmission element; 31. Proximal head; 32. First meshing tooth; 33. Meshing tooth groove; 331. Third groove wall; 332. Fourth groove wall; 34. Positioning groove; 35. Axial protrusion; 351. Abutment part; 4. Reverse Feeding element; 41, main body; 411, axial through hole; 42, ratchet arm; 421, arc-shaped spring arm; 422, pawl; 4221, first side wall; 4222, second side wall; 43, second meshing tooth; 431, third side wall; 432, fourth side wall; 5, elastic element; 6, pushing element; 61, first stop; 7, drive rod; 8, push rod; 9, cartridge bottle; 91, movable piston; 10, needle assembly. Detailed Implementation
[0026] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.
[0027] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.
[0028] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0029] Referring to all the accompanying drawings, embodiments of this application disclose an injection device with feedback function, which can generate acoustic signals and / or tactile information during dosage setting, thereby providing the user with a prompt that the dosage setting action is being performed.
[0030] Reference Figures 1 to 4 The injection device with feedback function includes a housing 1, a dispensing mechanism and a feedback mechanism. The housing 1 is a cylindrical component with a first axis as the central axis. The dispensing mechanism and the feedback mechanism are both located inside the housing 1. Specifically, the dispensing mechanism includes a scale element 2 and a transmission element 3, and the feedback mechanism includes a feedback element 4 and an elastic element 5.
[0031] The scale element 2 is coaxially disposed within the housing 1 and configured as a cylindrical component capable of rotating about a first axis. In a specific embodiment, the scale element 2 is threadedly connected to the housing 1, allowing the scale element 2 to extend or retract relative to the housing 1 in a spiral manner. Correspondingly, driving the scale element 2 to rotate clockwise and extend relative to the housing 1 in a spiral manner constitutes a dose increase process, while driving the scale element 2 to rotate counterclockwise and retract relative to the housing 1 in a spiral manner constitutes a dose decrease process. The transmission element 3 passes through the scale element 2 and is capable of rotating about the first axis. Specifically, the proximal end of the scale element 2 has a countersunk groove 21, and the inner wall of the countersunk groove 21 is provided with a ratchet tooth ring 22. The proximal end of the transmission element 3 has a proximal head 31 that expands outward radially, and the proximal head 31 is provided with an axially extending first meshing tooth 32. At the same time, the transmission element 3 extends into the interior of the scale element 2 from the proximal end of the scale element 2, and the proximal head 31 of the transmission element 3 abuts against the bottom of the countersunk groove 21 of the scale element 2 to prevent the transmission element 3 from continuing to move distally relative to the scale element 2.
[0032] Feedback element 4 is located within scale element 2 and near the proximal end of transmission element 3. The sidewall of feedback element 4 has a ratchet arm 42 for engaging with ratchet ring 22, and the distal end of feedback element 4 has a second engagement tooth 43 for engaging with first engagement tooth 32. Simultaneously, feedback element 4 can move relative to transmission element 3 from the first engagement position to the proximal position to the second engagement position. When feedback element 4 is in the first engagement position, the first engagement tooth 32 and the second engagement tooth 43 are engaged; when feedback element 4 is in the second engagement position, the first engagement tooth 32 and the second engagement tooth 43 are disengaged. Elastic element 5 provides elastic resistance to the movement of feedback element 4 from the first engagement position to the second engagement position, thereby maintaining the engagement state of the first engagement tooth 32 and the second engagement tooth 43. Specifically, during dose adjustment, the feedback element 4 is in the first engagement position to prevent the feedback element 4 from rotating relative to the transmission element 3. The scale element 2 rotates relative to the feedback element 4 so that the ratchet ring 22 and the ratchet arm 42 are misaligned to generate a first acoustic signal and / or a first tactile signal. During dose adjustment, the ratchet arm 42 engages with the ratchet ring 22 to prevent the scale element 2 from rotating relative to the feedback element 4. The feedback element 4 can reciprocate between the first engagement position and the second engagement position so that the feedback element 4 and the transmission element 3 rotate relative to each other, and the first meshing tooth 32 and the second meshing tooth 43 are misaligned to generate a second acoustic signal and / or a second tactile signal.
[0033] Using the above scheme, the user can set the dosage by rotating the scale element 2 relative to the housing 1. During dosage increase, the scale element 2 extends spirally relative to the housing 1. At this time, the feedback element 4 and the transmission element 3 are locked in the rotational direction. The scale element 2 and the feedback element 4 rotate relative to each other, causing the ratchet ring 22 and the ratchet arm 42 to misalign, generating a first acoustic signal and / or a first tactile signal to indicate that the dosage increase is in progress. Correspondingly, during dosage decrease, the scale element 2 retracts spirally relative to the housing 1. At this time, the scale element 2 and the feedback element 4 are locked in the rotational direction. The feedback element 4 and the transmission element 3 rotate relative to each other, and under the action of the elastic element 5, the first meshing tooth 32 and the second meshing tooth 43 misalign, generating a second acoustic signal and / or a second tactile signal to indicate that the dosage decrease is in progress. Therefore, this scheme can generate acoustic signals and / or tactile information during dosage setting, thereby providing the user with a prompt that the dosage setting action is in progress.
[0034] It is understood that the threaded connection between the scale element 2 and the housing 1 can be a direct threaded connection or an indirect threaded connection; no particular limitation is made here. Accordingly, the descriptions of proximal and distal ends mentioned above are all based on the user as the observer, with proximal end referring to the end closer to the user and distal end referring to the end farther from the user.
[0035] It should be noted that the elastic element 5 is used to provide elastic resistance for the feedback element 4 to move from the first mating position to the second mating position. This indicates that the elastic element 5, when assembled into the injection device, is used to hold the feedback element 4 in the first mating position. When the feedback element 4 is subjected to a thrust toward the proximal end, the feedback element 4 can compress the elastic element 5 and move toward the proximal end to the second mating position. When the force on the feedback element 4 disappears, the feedback element 4 will move toward the distal end to the first mating position under the action of the elastic restoring force of the elastic element 5.
[0036] Further, refer to Figure 2 and Figure 5 In some specific embodiments, the feedback element 4 is configured with two ratchet arms 42, which are centrally symmetrical about the central axis of the feedback element 4. By providing two ratchet arms 42 and configuring them centrally symmetrically, the centered position of the feedback element 4 in the scale element 2 can be better maintained, thereby reducing the possibility that the feedback effect may be affected by the feedback element 4 deviating from the central position.
[0037] Furthermore, combined Figure 5 and Figure 6 In some embodiments, the ratchet ring 22 has ratchet tooth grooves 23 arranged in a circumferential direction, and the ratchet arm 42 includes an arc-shaped spring arm 421 and a pawl 422 located at the free end of the arc-shaped spring arm 421, wherein the pawl 422 can be engaged with the ratchet tooth grooves 23. Furthermore, the ratchet tooth grooves 23 have a first groove wall 231 and a second groove wall 232 facing each other in a circumferential direction, and the pawl 422 has a first side wall 4221 and a second side wall 4222 facing each other in a circumferential direction. Specifically, both the first sidewall 4221 and the first groove wall 231 are inclined surfaces. During dose adjustment, the feedback element 4 and the scale element 2 rotate relative to each other. At this time, the first sidewall 4221 of the pawl 422 abuts against the first groove wall 231 of the ratchet tooth groove 23 and slides against each other as they continue to approach, so that the pawl 422 slides out of a ratchet tooth groove 23 and the arc-shaped spring arm 421 elastically deforms. Then, under the action of the elastic restoring force of the arc-shaped spring arm 421, it strikes an adjacent ratchet tooth groove 23, thereby generating a first acoustic signal and / or a first tactile signal. During dose adjustment, the second sidewall 4222 of the pawl 422 abuts against the second groove wall 232 of the ratchet tooth groove 23 to prevent them from continuing to approach each other, so as to prevent the scale element 2 and the feedback element 4 from rotating relative to each other. Correspondingly, the first acoustic signal refers to the sound produced when the pawl 422 strikes the ratchet tooth groove 23 under the elastic restoring force of the arc-shaped spring arm 421, while the first tactile signal refers to the vibration produced when the pawl 422 strikes the ratchet tooth groove 23 under the elastic restoring force of the arc-shaped spring arm 421.
[0038] Further, refer to Figure 4 and Figure 7 In some embodiments, the first meshing teeth 32 are arranged circumferentially along the transmission element 3 to form a meshing tooth ring, and a meshing tooth groove 33 is formed between two adjacent first meshing teeth 32 for the second meshing teeth 43 to mesh into; wherein the meshing tooth groove 33 has a third groove wall 331 and a fourth groove wall 332 opposite to each other, and the second meshing teeth 43 have a third side wall 431 and a fourth side wall 432 opposite to each other. Furthermore, during dose increase, the third sidewall 431 of the second meshing tooth 43 abuts against the third groove wall 331 of the meshing tooth groove 33, preventing them from getting closer and thus preventing relative rotation between the feedback element 4 and the transmission element 3. The fourth sidewall 432 and the fourth groove wall 332 are both inclined surfaces, and during dose decrease, the fourth sidewall 432 abuts against the fourth groove wall 332 and slides against each other as they get closer, causing the second meshing tooth 43 to slide out of one of the meshing tooth grooves 33, causing the feedback element 4 to compress the elastic element 5 proximally and undergo elastic deformation. Subsequently, under the elastic restoring force of the elastic element 5, it strikes an adjacent meshing tooth groove 33, thereby generating a second acoustic signal and / or a second tactile signal. Accordingly, the second acoustic signal refers to the sound produced by the second meshing tooth 43 striking the meshing tooth groove 33 under the elastic restoring force of the elastic element 5, and the second tactile signal refers to the vibration produced by the second meshing tooth 43 striking the meshing tooth groove 33 under the elastic restoring force of the elastic element 5.
[0039] Furthermore, in some specific embodiments, if the dose set by rotating the scale element 2 one revolution relative to the transmission element 3 is defined as X unit doses, then the number of ratchet tooth grooves 23 arranged in the circumferential direction is configured as X, so that the user can receive a first acoustic signal and / or a first tactile signal prompt when adjusting the dose by one unit; correspondingly, the number of meshing tooth grooves 33 arranged in the circumferential direction is configured as X, so that the user can receive a second acoustic signal and / or a second tactile signal prompt when adjusting the dose by one unit.
[0040] Further, refer to Figures 2 to 4 In some specific embodiments, the proximal head 31 of the transmission element 3 is formed with a positioning groove 34 along the axial direction, and a first meshing tooth 32 is disposed at the bottom of the positioning groove 34; the feedback element 4 includes a cylindrical body 41, and a second meshing tooth 43 is disposed at the distal end of the body 41; the distal end of the body 41 can extend into the positioning groove 34 so that the second meshing tooth 43 engages with the first meshing tooth 32. In some embodiments, the elastic element 5 is configured as a linear spring extending along the axial direction, and the elastic element 5 is sleeved on the proximal end of the body 41.
[0041] Further, refer to Figure 4 and Figure 5The main body 41 has an axial through hole 411 inside, and the positioning groove 34 has an axially extending axial protrusion 35 that can extend into the axial through hole 411. There is a gap between the outer wall of the axial protrusion 35 and the inner wall of the axial through hole 411. The side wall of the axial protrusion 35 has an abutting part 351 for abutting against the inner wall of the axial through hole 411. The abutting part 351 is in the shape of an axially extending convex ridge. When the feedback element 4 and the transmission element 3 rotate relative to each other, the axial protrusion 35 and the axial through hole 411 rotate relative to each other, and the abutting part 351 abuts against the inner wall of the axial through hole 411 to form a bearing structure between the two.
[0042] Reference Figures 1 to 3 The injection device also includes a push element 6 that transmits thrust during dose injection and a transmission mechanism for converting the motion of the dispensing mechanism into drug injection thrust during dose injection.
[0043] The pushing element 6 is located on the proximal side of the elastic element 5, and the distal end of the pushing element 6 is housed in the proximal end of the scale element 2. The proximal end of the pushing element 6 is used for the user to press and apply pushing force. At the same time, the pushing element 6 can move relative to the scale element 2 from the first position to the distal position under the action of the pressing force. Correspondingly, the outer wall of the pushing element 6 is provided with a first annular stop 61, and the inner wall of the scale element 2 is provided with a second annular stop 24. When the pushing element 6 is in the first position, the proximal end of the first stop 61 abuts against the distal end of the second stop 24. In addition, the elastic element 5 is located between the feedback element 4 and the pushing element 6, and in the normal assembly state, the elastic element 5 is used to maintain the pushing element 6 in the first position and to provide elastic resistance for the pushing element 6 to move from the first position to the second position.
[0044] Specifically, during dose setting, the push element 6 is in the first position, allowing the feedback element 4 to move from the first mating position to the second mating position; during dose injection, the push element 6 is in the second position, preventing the feedback element 4 from moving from the first mating position to the second mating position. In some specific embodiments, the distance between the push element 6 in the second position and the feedback element 4 in the first mating position is less than the axial displacement required for the second meshing tooth 43 to disengage from the meshing tooth groove 33, thereby preventing the feedback element 4 from moving from the first mating position to the second mating position; in other specific embodiments, the push element 6 in the second position abuts against the feedback element 4 in the first mating position to prevent the feedback element 4 from moving towards the second mating position in the proximal direction.
[0045] Understandably, during the dosage injection, the user transmits power to the scale element 2 by pressing the push element 6, causing the scale element 2 to rotate counterclockwise and retract spirally relative to the housing 1. At this time, the scale element 2 and the feedback element 4 rotate synchronously. Simultaneously, the push element 6, which is subjected to the pressing force, is in the second position, which correspondingly prevents the relative rotation between the feedback element 4 and the transmission element 3, so that the scale element 2, the feedback element 4 and the transmission element 3 rotate synchronously in the counterclockwise direction.
[0046] Reference Figure 1 The transmission mechanism includes a drive rod 7 and a push rod 8. The drive rod 7 is located inside the transmission element 3 and sleeved outside the push rod 8. The drive rod 7 is axially fixed and rotatably mounted in the housing 1, and is anti-rotationally connected to the transmission element 3. The push rod 8 is threadedly connected to the drive rod 7 and forms an axial guiding fit with the housing 1. During dosage injection, the scale element 2 drives the transmission element 3 and the drive rod 7 to rotate along the dosage injection direction, thereby driving the push rod 8 to advance axially. Correspondingly, a cartridge vial 9 containing medication is connected to the distal end of the injection device. The cartridge vial 9 has a movable piston 91 at its proximal end and a needle assembly 10 connected to its distal end. The axially advancing push rod 8 pushes the movable piston 91 of the cartridge vial 9 to move distally, thereby discharging the medication from the cartridge vial 9 through the needle assembly 10.
[0047] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the illustrative use of the above terms does not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
[0048] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.
Claims
1. An injection device with feedback function, characterized in that, include: The housing has a first axis; A scale element is rotatable relative to the housing about a first axis for dose setting, and the sidewall of the scale element is provided with a ratchet ring; A transmission element is inserted into the scale element and is rotatable about the first axis. The transmission element is provided with an axially extending first meshing tooth. A feedback element is disposed between the scale element and the transmission element. The sidewall of the feedback element is provided with a ratchet arm for engaging with the ratchet ring, and the feedback element is provided with a second meshing tooth for engaging with the first meshing tooth. The feedback element can move relative to the transmission element from a first engagement position to a second engagement position. When the feedback element is in the first engagement position, the first meshing tooth and the second meshing tooth are engaged; when the feedback element is in the second engagement position, the first meshing tooth and the second meshing tooth are disengaged. An elastic element is used to provide elastic resistance for the feedback element to move from the first mating position to the second mating position; During dose adjustment, the feedback element is in a first engagement position to prevent the feedback element from rotating relative to the transmission element, and the scale element rotates relative to the feedback element to generate a first acoustic signal and / or a first tactile signal between the ratchet ring and the ratchet arm. During dose reduction, the ratchet arm engages with the ratchet ring to prevent the scale element from rotating relative to the feedback element. The feedback element is reciprocating between a first engagement position and a second engagement position to cause relative rotation between the feedback element and the transmission element, and to generate a second acoustic signal and / or a second tactile signal between the first engagement tooth and the second engagement tooth.
2. The injection device with feedback function according to claim 1, characterized in that, The feedback element is configured with two ratchet arms, which are centrally symmetrical about the central axis of the feedback element.
3. The injection device with feedback function according to claim 1, characterized in that, The ratchet ring has ratchet tooth grooves arranged in a circumferential direction, and the ratchet arm includes an arc-shaped spring arm and a pawl at the free end of the arc-shaped spring arm, the pawl being able to engage with the ratchet tooth grooves; The ratchet tooth groove has a first groove wall and a second groove wall opposite each other in the circumferential direction, and the pawl has a first side wall and a second side wall opposite each other in the circumferential direction; the first side wall and the first groove wall are both inclined surfaces, and during dose adjustment, the first side wall abuts against the first groove wall and slides against each other as they continue to approach each other; during dose adjustment, the second side wall abuts against the second groove wall and prevents them from approaching each other.
4. The injection device with feedback function according to claim 3, characterized in that, If the dose set by the rotation of the scale element relative to the transmission element in one revolution is defined as X unit doses, then the number of ratchet tooth grooves arranged in the circumferential direction is X.
5. The injection device with feedback function according to claim 1, characterized in that, The first meshing teeth are arranged circumferentially along the transmission element to form a meshing tooth ring, and a meshing tooth groove is formed between two adjacent first meshing teeth for the second meshing teeth to engage. The meshing tooth groove has opposing third and fourth groove walls, and the second meshing teeth have opposing third and fourth side walls. During dose increase, the third side wall abuts against the third groove wall and prevents them from getting closer. The fourth side wall and the fourth groove wall are both inclined surfaces, and during dose decrease, the fourth side wall abuts against the fourth groove wall and slides against each other as they get closer.
6. The injection device with feedback function according to claim 1, characterized in that, The transmission element has a positioning groove at its proximal end, and the first meshing tooth is located at the bottom of the positioning groove; the feedback element includes a main body, the distal end of which can extend into the positioning groove, and the second meshing tooth is located at the distal end of the main body.
7. The injection device with feedback function according to claim 6, characterized in that, The main body has an axial through hole, and the positioning groove has an axial protrusion that can extend into the axial through hole. There is a gap between the outer wall of the axial protrusion and the inner wall of the axial through hole, and the side wall of the axial protrusion has an abutting part for abutting against the inner wall of the axial through hole.
8. The injection device with feedback function according to claim 6, characterized in that, The elastic element is configured as a linear spring extending axially, and the elastic element is sleeved on the proximal end of the body.
9. The injection device with feedback function according to claim 1, characterized in that, The injection device further includes a push element movable relative to the scale element from a first position to a second position; an elastic element is located between the feedback element and the push element, and the elastic element provides elastic resistance to the push element moving from the first position to the second position; during dose setting, the push element is in the first position and allows the feedback element to move from the first mating position to the second mating position; during dose injection, the push element is in the second position and prevents the feedback element from moving from the first mating position to the second mating position.
10. The injection device with feedback function according to claim 9, characterized in that, The distal end of the pushing element is housed in the proximal end of the scale element, and the outer side wall of the pushing element is provided with a first stop portion, and the inner side wall of the scale element is provided with a second stop portion. When the pushing element is in the first position, the proximal end of the first stop portion abuts against the distal end of the second stop portion.