Injection button assembly and pressing driving mechanism

Abstract

The utility model relates to a pushing and injecting button assembly and a pressing driving mechanism, the pushing and injecting button assembly comprises a button part and a transmission part, the button part and the transmission part rotate relatively in the pushing and injecting process, the pushing and injecting button assembly further comprises a low-friction part, and the low-friction part is used for transmitting pushing force borne by the button part to the transmission part; the dynamic friction coefficient of the button part and the transmission part is defined as a reference friction coefficient; the low-friction part rotates relative to the button part in the injection process, the dynamic friction coefficient of the low-friction part and the button part is defined as a first friction coefficient, and the first friction coefficient is configured to be smaller than a reference friction coefficient; and / or, the low-friction part rotates relative to the transmission part in the injection process, the dynamic friction coefficient of the low-friction part and the transmission part is defined as a second friction coefficient, and the second friction coefficient is configured to be smaller than the reference friction coefficient. The friction resistance of a user in the injection process is reduced, and the purpose of reducing the injection force of the user is achieved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of a bolus injection device, in particular to a bolus injection button assembly and a pressing driving mechanism. BACKGROUND

[0002] When injecting a medicine, a specific injection device is used, and a user sets a dose and injects the set dose according to a demand. A conventional injection device mainly comprises a housing, a dose setting component, a bolus injection button assembly and a driving feed assembly. The dose setting component can be adjusted in a screw-up manner to set a dose and adjusted in a screw-down manner to reset a dose relative to the housing. The bolus injection button assembly usually comprises a button component and a transmission component. The button component is used to bear an axial pushing force of a user and transmit the pushing force to the dose setting component through the transmission component, so that the dose setting component is screwed back into the housing. In this process, the screwing movement of the dose setting component is transmitted to the driving feed assembly, and the driving feed assembly pushes the medicine to realize injection.

[0003] When the injection dose is set and the user performs a bolus injection, the button component rotates relative to the transmission component, and the transmission component rotates synchronously with the dose setting component. Friction is generated between the two components rotating relative to each other, and the friction is too large to increase the bolus injection resistance of the user. CONTENT OF THE UTILITY MODEL

[0004] In order to reduce the resistance of the user in the bolus injection process, one of the purposes of the application is to provide a bolus injection button assembly.

[0005] The second purpose of the application is to provide a pressing driving mechanism, which comprises the above-mentioned bolus injection button assembly and can reduce the resistance of the user in the bolus injection process.

[0006] One of the purposes of the application is achieved by using the following technical solution:

[0007] A bolus injection button assembly comprises a button component and a transmission component. The button component rotates relative to the transmission component in a bolus injection process. The bolus injection button assembly further comprises a low-friction component. The low-friction component is used to transmit a pushing force borne by the button component to the transmission component. A dynamic friction coefficient of the button component and the transmission component is defined as a reference friction coefficient.

[0008] The low-friction component rotates relative to the button component in the bolus injection process. A dynamic friction coefficient of the low-friction component and the button component is defined as a first friction coefficient. The first friction coefficient is configured to be smaller than the reference friction coefficient.

[0009] And / or, the low-friction component is relatively rotatable with the transmission component during the injection process, defining a dynamic friction coefficient between the low-friction component and the transmission component as a second friction coefficient, the second friction coefficient being configured to be less than the reference friction coefficient.

[0010] By employing the above technical solution, the low-friction component is added between the button component and the transmission component, and the dynamic friction coefficient of at least one of the button component and the transmission component relative to the low-friction component is configured to be lower than the reference friction coefficient between the button component and the transmission component, so as to reduce the friction resistance in the injection process of the user, and further reduce the injection resistance of the user.

[0011] Further, the low-friction component is relatively rotatable with the button component during the injection process, and the low-friction component is relatively rotatable with the transmission component.

[0012] By employing the above technical solution, the low-friction component is relatively rotatable with the button component and the transmission component during the injection process, and the first friction coefficient and the second friction coefficient are both configured to be less than the dynamic friction coefficient of the button component and the transmission component, so as to better reduce the friction resistance in the injection process, and further reduce the injection resistance of the user.

[0013] Further, the low-friction component includes a proximal end surface and a distal end surface which are relatively arranged in the injection direction, the button component includes a first contact surface which is in contact with the proximal end surface of the low-friction component, and the transmission component includes a second contact surface which is in contact with the distal end surface of the low-friction component.

[0014] One of the proximal end surface of the low-friction component and the first contact surface is provided with a first contact protrusion which protrudes axially towards the other, and / or one of the distal end surface of the low-friction component and the second contact surface is provided with a second contact protrusion which protrudes axially towards the other.

[0015] By employing the above technical solution, the first contact protrusion and / or the second contact protrusion can reduce the contact area between the two relatively rotatable components, so as to reduce the friction resistance between the two relatively rotatable components.

[0016] Further, the button component or the transmission component is centrally provided with an axially extending positioning column, and the low-friction component is centrally provided with a positioning hole, and the positioning column is arranged in the positioning hole.

[0017] By employing the above technical solution, the positioning column can be used to position the low-friction component, so as to facilitate the installation of the low-friction component, and the low-friction component can have good coaxiality with the button component and the transmission component after assembly, and the good coaxiality can reduce the friction resistance caused by the axial deviation of the low-friction component.

[0018] Further, one of the button component and the transmission component is centrally provided with an axial positioning post, and the other is provided with a positioning sleeve capable of being sleeved outside the positioning post.

[0019] By adopting the above technical solution, the coaxiality between the button component and the transmission component can be maintained, so as to reduce the frictional resistance caused by the axis deflection during the relative rotation.

[0020] Further, one of the positioning post outer wall and the positioning sleeve inner wall is provided with a radial contact protrusion close to the other.

[0021] By adopting the above technical solution, when the button component and the transmission component are relatively rotated, the radial contact protrusion can reduce the contact area between the positioning post outer wall and the positioning sleeve inner wall, thereby reducing the frictional resistance during the relative rotation.

[0022] Further, the push injection button assembly further comprises an elastic component arranged between the button component and the transmission component, the button component can be axially moved from a first position to a second position closer to the transmission component during the push injection, and the elastic component is used to provide an elastic force for maintaining the low-friction component and the button component in contact.

[0023] In some solutions, the button component can be moved from the first position to the second position further close to the transmission component during the push injection, that is, when the button component is in the first position, the distance between the button component and the transmission component is greater than the axial thickness of the low-friction component, so that the low-friction component is more likely to be axially skewed; by adopting the above technical solution, the elastic component between the button component and the transmission component can always maintain the contact state of the low-friction component and the button component, so as to reduce the axial deflection of the low-friction component caused by the position shaking.

[0024] Further, one of the button component and the transmission component is centrally provided with an axial positioning post, and the other is provided with a positioning sleeve capable of being sleeved outside the positioning post.

[0025] By adopting the above technical solution, the axial post and the surrounding sleeve can guide the linear spring well, so as to avoid the excessive deflection of the linear spring caused by the stress compression during the push injection, and reduce the coaxiality between the button component and the transmission component.

[0026] Further, one of the button component and the transmission component is fixed in the rotation direction relative to the low-friction component, and the other can be relatively rotated relative to the low-friction component.

[0027] Further, the low-friction component is configured as a PTFE sheet or a graphite sheet.

[0028] The second purpose of the present application is achieved by the following technical solution:

[0029] A press drive mechanism, comprising a housing, a dose setting component, a clutch component, a drive component and the aforementioned injection button assembly, the dose setting component is threadedly connected to the housing, the injection button assembly is at least partially accommodated in the proximal end of the dose setting component, and a anti-disengagement structure is arranged between the injection button assembly and the proximal end of the dose setting component, the anti-disengagement structure is used to prevent the injection button assembly and the dose setting component from completely disengaging; the dose setting component is screwed back into the housing under the action of the axial thrust of the injection button assembly, the drive component, the clutch component and the dose setting component form a fixed rotation direction during the injection process; the drive component and the clutch component are locked in the rotation direction and can move axially relative to each other.

[0030] In summary, the present application at least includes the following beneficial technical effects: by adding a low-friction component between the button component and the drive component, and configuring the dynamic friction coefficient of at least one of the button component and the drive component relative to the low-friction component to be lower than the reference friction coefficient between the button component and the drive component, the frictional resistance of the user during the injection process can be reduced, and the injection resistance of the user can be further reduced. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is a schematic view of an injection button assembly mounted at the proximal end of an injection device in an embodiment of the present application;

[0032] Figure 2 is a sectional view of the injection button assembly in an embodiment of the present application;

[0033] Figure 3 is Figure 2 is an enlarged schematic view of part A in FIG. 6;

[0034] Figure 4 is a sectional view of the injection button assembly in another embodiment of the present application;

[0035] Figure 5 is Figure 4 is an enlarged schematic view of part B in FIG. 7;

[0036] Figure 6 is a sectional view of the injection button assembly in another embodiment of the present application;

[0037] Figure 7 is Figure 6 is an enlarged schematic view of part C in FIG. 8;

[0038] Figure 8 is a schematic view of a button member in an embodiment of the application;

[0039] Figure 9 is a schematic view of a press drive mechanism in an embodiment of the application;

[0040] Figure 10 is an exploded schematic view of a press drive mechanism in an embodiment of the application;

[0041] Figure 11 is a cross-sectional view of a proximal end of a dose setting member in an embodiment of the application;

[0042] Figure 12 is a schematic view of a proximal end of a clutch member in an embodiment of the application;

[0043] Figure 13 is a cross-sectional view of a button member in an embodiment of the application;

[0044] Figure 14 is a schematic view of a first engagement tooth and a ratchet arm of a transmission member in an embodiment of the application.

[0045] BRIEF DESCRIPTION OF THE DRAWINGS: 1. Button member; 11. First abutment surface; 12. Positioning post; 121. Protruding rib; 13. Surrounding sleeve; 14. Annular outer wall; 141. Co-operating annular groove; 142. Anti-backout position; 2. Transmission member; 21. Second abutment surface; 22. Positioning sleeve; 23. First engagement tooth; 24. Ratchet arm; 3. Low friction member; 31. Proximal end surface; 32. Distal end surface; 4. Resilient member; 5. First abutment protrusion; 6. Second abutment protrusion; 7. Housing; 8. Dose setting member; 81. Enlarged head end; 811. Anti-backout protrusion; 812. Ratchet tooth ring; 9. Clutch member; 91. Protruding ring flange; 92. Proximal recess; 921. Second engagement tooth; 10. Drive member. DETAILED DESCRIPTION

[0046] Embodiments of the application are described below in detail, examples of which are shown in the drawings, wherein the same or similar reference numerals are used to represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary only, and are used only to explain the present application, and cannot be understood as limiting the present application.

[0047] In the description of the utility model, it needs to be understood that, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, only for the convenience of describing the utility model and simplifying the description, and not indicating or implying that the indicated device or element must have a particular orientation, a particular orientation and operation, therefore, it cannot be understood as a limitation on the utility model. In addition, the features limited by "first", "second" can be explicitly or implicitly include one or more features. In the description of the utility model, unless otherwise stated, the meaning of "a plurality of" is two or more.

[0048] In the description of the utility model, it needs to be understood that, unless otherwise specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected, it can be mechanical connection, or electrical connection, it can be directly connected, or indirectly connected through intermediate medium, it can be the communication between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0049] When injecting medicine, a specific injection device is used, and the user sets the dose according to the needs and injects the set dose. The conventional injection device mainly includes a housing, a dose setting component, a push button assembly and a drive feed assembly, wherein the dose setting component is threadedly connected with the housing so that the dose can be adjusted by screwing up relative to the housing, and the dose can be adjusted by screwing down. The push button assembly usually includes a button component and a transmission component, the button component is used to bear the axial thrust of the user and transmit the thrust to the dose setting component through the transmission component, so that the dose setting component is screwed back into the housing, and in this process, the screw motion of the dose setting component is transmitted to the drive feed assembly, and then the drive feed assembly pushes the medicine to realize injection. When the injection dose is set and pushed by the user, the button component is usually relatively rotated with the transmission component, and the transmission component is synchronously rotated with the dose setting component; the relative rotation between the two components generates friction, and the friction is too large to increase the injection resistance of the user.

[0050] The embodiment of the application discloses a push button assembly, which can reduce the resistance of the user during the injection process.

[0051] Figure 1 A push button assembly mounted on the proximal end of an injection device is shown, wherein the proximal end is the end close to the operation of the user, and the distal end is the end away from the operation of the user. Referring to Figure 1and Figure 2 The injection button assembly comprises a button component 1, a transmission component 2 and a low-friction component 3. The button component 1 is at the proximal end of the injection button assembly and is used for the user to push. The transmission component 2 is at the distal end of the injection button assembly and is centrally accommodated in the dose setting component 8, and the transmission component 2 abuts against the dose setting component 8 during the injection process. At the same time, the low-friction component 3 is between the button component 1 and the transmission component 2, and the low-friction component 3 is used to transmit the axial pushing force of the button component 1 to the transmission component 2. The axial direction refers to the direction from the proximal end to the distal end, or from the distal end to the proximal end. Specifically, during the injection process after the user sets the dose, the axial pushing force of the user is applied to the button component 1, and the axial pushing force is transmitted to the transmission component 2 through the low-friction component 3, and the transmission component 2 transmits the axial pushing force to the dose setting component 8, so that the dose setting component 8 spirally retreats into the housing 7. During this process, the transmission component 2 rotates relative to the button component 1 following the dose setting component 8, while the low-friction component 3 can at least rotate relative to one of the transmission component 2 and the button component 1, and the dynamic friction coefficient between the low-friction component 3 and the component that can rotate relative to it is configured to be less than the dynamic friction coefficient when the button component 1 and the transmission component 2 theoretically abut and slide relative to each other, so as to reduce the frictional resistance in the user's injection process, thereby reducing the user's injection resistance.

[0052] For the convenience of subsequent further description of the embodiments, the dynamic friction coefficient between the button component 1 and the transmission component 2 is defined as the reference friction coefficient. It should be noted that the dynamic friction coefficient, also known as the dynamic friction factor, is a commonly used parameter related to the inherent material properties of an object. The reference friction coefficient can be obtained by testing the relative sliding of the button component 1 and the transmission component 2 in a test scenario, or it can be obtained by querying and extracting the material of the button component 1 and the transmission component 2 by those skilled in the art. Therefore, the reference friction system is only used as a comparison object for the first friction coefficient and the second friction coefficient described later, that is, in the actual assembly relationship of the injection button assembly, the button component 1 and the transmission component 2 that can rotate relative to each other can abut and produce sliding friction, or they can not contact each other and not produce sliding friction.

[0053] In some embodiments, the low-friction component 3 can rotate relative to the button component 1 and relative to the transmission component 2 during the injection process. Accordingly, for the convenience of subsequent description, the dynamic friction coefficient when the low-friction component 3 and the button component 1 slide relative to each other is defined as the first friction coefficient, and the dynamic friction coefficient when the low-friction component 3 and the transmission component 2 slide relative to each other is defined as the second friction coefficient. In a specific configuration, the first friction coefficient and the second friction coefficient are both configured to be less than the reference friction coefficient between the button component 1 and the transmission component 2, so as to reduce the frictional resistance in the user's injection process.

[0054] In some embodiments, the low-friction component 3 rotates relative to the button component 1 during the injection process, and rotates synchronously with the transmission component 2; accordingly, the dynamic friction coefficient when the low-friction component 3 slides relative to the button component 1 is defined as the first friction coefficient, which is configured to be smaller than the reference friction coefficient between the button component 1 and the transmission component 2, so as to reduce the frictional resistance during the injection process for the user. In some specific embodiments, the transmission component 2 and the low-friction component 3 are fixed by bonding or welding, so that they rotate synchronously during the injection process; in other specific embodiments, the transmission component 2 and the low-friction component 3 are provided with a tooth-and-groove cooperation on the opposite surfaces to realize synchronous rotation during the injection process.

[0055] In some embodiments, the low-friction component 3 rotates relative to the transmission component 2 during the injection process, and rotates synchronously with the button component 1; accordingly, the dynamic friction coefficient when the low-friction component 3 slides relative to the transmission component 2 is defined as the second friction coefficient, which is configured to be smaller than the reference friction coefficient between the button component 1 and the transmission component 2, so as to reduce the frictional resistance during the injection process for the user. In some specific embodiments, the button component 1 and the low-friction component 3 are fixed by bonding or welding, so that they rotate synchronously during the injection process; in other specific embodiments, the button component 1 and the low-friction component 3 are provided with a tooth-and-groove cooperation on the opposite surfaces to realize synchronous rotation during the injection process.

[0056] Further, in the above embodiments, in order to make the first friction coefficient and / or the second friction coefficient less than the reference friction coefficient between the button component 1 and the transmission component 2, the low-friction component 3 is configured to include a low-friction contact surface; for example, the contact surface of the low-friction component 3 and the button component 1 is set as a low-friction contact surface, so that the first friction coefficient is less than the reference friction coefficient between the button component 1 and the transmission component 2; or for example, the contact surface of the low-friction component 3 and the transmission component 2 is set as a low-friction contact surface, so that the second friction coefficient is less than the reference friction coefficient between the button component 1 and the transmission component 2. In specific embodiments, the material that meets the requirements can be selected based on the design value of the kinetic friction coefficient; for example, in a specific example, the reference friction coefficient is designed to be 0.2 to 0.3, and the first friction coefficient and the second friction coefficient are designed to be 0.04 to 0.1. Based on the design value of this specific example, the aforementioned low-friction contact surface can be a PTFE surface or a graphite surface in specific embodiments, and accordingly, the button and the sound sheet are made of polyoxymethylene (POM) or polybutylene terephthalate (PBT). In addition, in order to facilitate preparation, the low-friction component 3 can be configured as a low-friction gasket as a whole, such as a PTFE sheet or a graphite sheet; and accordingly, the button and the sound sheet are made of polyoxymethylene (POM) or polybutylene terephthalate (PBT). Wherein, PTFE is polytetrafluoroethylene.

[0057] Further, in the embodiments in which the low-friction component 3 can rotate relative to the button component 1 and can rotate relative to the transmission component 2 during the injection, the low-friction component 3 includes a proximal end surface 31 and a distal end surface 32 arranged opposite in the injection direction, the button component 1 includes a first abutting surface 11 abutting against the proximal end surface 31 of the low-friction component 3, and the transmission component 2 includes a second abutting surface 21 abutting against the distal end surface 32 of the low-friction component 3. By arranging an abutting protrusion between the proximal end surface 31 of the low-friction component 3 and the first abutting surface 11 and / or between the distal end surface 32 of the low-friction component 3 and the second abutting surface 21, the contact area of the two components during relative rotation can be reduced, thereby reducing the frictional resistance during rotation.

[0058] In some embodiments, one of the proximal end surface 31 of the low-friction component 3 and the first abutting surface 11 is provided with a first abutting protrusion 5 protruding axially towards the other, so as to reduce the contact area of the proximal end surface 31 of the low-friction component 3 and the first abutting surface 11, thereby reducing the frictional force during rotation of the two. Referring to Figure 2 and Figure 3 In the present embodiment, the first abutting protrusion 5 is arranged on the first abutting surface 11 of the button component 1, and in other embodiments, the first abutting protrusion 5 can also be arranged on the proximal end surface 31 of the low-friction component 3; meanwhile, in the present embodiment, the first abutting protrusion 5 is arranged as an annular protrusion, and in other embodiments, the first abutting protrusion 5 can also be arranged as uniformly distributed protrusions.

[0059] In some embodiments, the second contact protrusion 6 is arranged on the distal end surface 32 of the low-friction component 3, and the first contact protrusion 5 is arranged on the proximal end surface 31 of the low-friction component 3. In other embodiments, the second contact protrusion 6 is arranged on the second contact surface 21, and the first contact protrusion 5 is arranged on the first contact surface 11.

[0060] In some embodiments, the first contact protrusion 5 is arranged on the proximal end surface 31 of the low-friction component 3, and the second contact protrusion 6 is arranged on the distal end surface 32 of the low-friction component 3. In other embodiments, the first contact protrusion 5 is arranged on the first contact surface 11, and the second contact protrusion 6 is arranged on the second contact surface 21. Figure 4 Figure 5 In some embodiments, the first contact protrusion 5 is arranged on the proximal end surface 31 of the low-friction component 3, and the second contact protrusion 6 is arranged on the distal end surface 32 of the low-friction component 3. In other embodiments, the first contact protrusion 5 is arranged on the first contact surface 11, and the second contact protrusion 6 is arranged on the second contact surface 21. Figure 6 Figure 7 In some embodiments, the first contact protrusion 5 is arranged on the proximal end surface 31 of the low-friction component 3, and the second contact protrusion 6 is arranged on the distal end surface 32 of the low-friction component 3. In other embodiments, the first contact protrusion 5 is arranged on the first contact surface 11, and the second contact protrusion 6 is arranged on the second contact surface 21.

[0061] In some embodiments, the first contact protrusion 5 is arranged on the proximal end surface 31 of the low-friction component 3, and the second contact protrusion 6 is arranged on the distal end surface 32 of the low-friction component 3. In other embodiments, the first contact protrusion 5 is arranged on the first contact surface 11, and the second contact protrusion 6 is arranged on the second contact surface 21. Figure 2 Figure 3 In some embodiments, the first contact protrusion 5 is arranged on the proximal end surface 31 of the low-friction component 3, and the second contact protrusion 6 is arranged on the distal end surface 32 of the low-friction component 3. In other embodiments, the first contact protrusion 5 is arranged on the first contact surface 11, and the second contact protrusion 6 is arranged on the second contact surface 21.

[0062] In some embodiments, the first contact protrusion 5 is arranged on the proximal end surface 31 of the low-friction component 3, and the second contact protrusion 6 is arranged on the distal end surface 32 of the low-friction component 3. In other embodiments, the first contact protrusion 5 is arranged on the first contact surface 11, and the second contact protrusion 6 is arranged on the second contact surface 21. Figure 2 Figure 3 ​​​​, specifically in this embodiment, the positioning column 12 is arranged on the button component 1, and the transmission component 2 is correspondingly provided with a positioning sleeve 22 capable of being sleeved on the positioning column 12, the main body of the positioning column 12 is in the shape of a cylinder, and the positioning sleeve 22 is correspondingly in the shape of a cylindrical barrel; the sleeve connection of the positioning sleeve 22 and the positioning column 12 can maintain good coaxiality between the button component 1 and the transmission component 2. In other embodiments, the positioning column 12 is arranged on the transmission component 2, and the positioning sleeve 22 is correspondingly arranged on the button component 1.

[0063] During the relative rotation of the button component 1 and the transmission component 2 in the bolus process, the button component 1 and the transmission component 2 are prone to axial deflection, which increases the friction between the positioning column 12 and the positioning sleeve 22 during the relative rotation. Accordingly, to reduce this part of the friction, one of the outer wall of the positioning column 12 and the inner wall of the positioning sleeve 22 is provided with a radial contact protrusion close to the other. Referring to Figure 2 and Figure 8 , specifically in this embodiment, the radial contact protrusion is arranged on the positioning column 12 of the button component 1, and the radial contact protrusion is configured as a plurality of axially extending ribs 121, and the plurality of ribs 121 are uniformly arranged in the circumferential direction of the positioning column 12. The arrangement of the ribs 121 can reduce the contact area between the outer wall of the positioning column 12 and the inner wall of the positioning sleeve 22, thereby reducing the frictional resistance when the two are relatively rotated. Meanwhile, in this embodiment, the low-friction component 3 provided with the positioning hole is sleeved on the positioning column 12 of the button component 1, and when the button component 1 and the low-friction component 3 are relatively rotated, the ribs 121 on the positioning column 12 abut against the inner wall of the positioning hole on the low-friction component 3, which to a certain extent reduces the friction area and thus reduces the friction.

[0064] In some specific embodiments, the button component 1, the transmission component 2 and the low-friction component 3 in the bolus button assembly are configured to keep synchronous movement in the axial direction, in which case the low-friction component 3 is always clamped in the middle by the button component 1 and the transmission component 2.

[0065] Referring to Figure 1 and Figure 2In some embodiments, the transmission component 2 and the button component 1 are configured to be capable of relative movement in the axial direction by a certain distance, for example, the button component 1 can be moved from the first position to the second position closer to the transmission component 2 during the injection process, so that when the button component 1 is in the first position, the distance between the button component 1 and the transmission component 2 is greater than the axial thickness of the low-friction component 3, so that the low-friction component 3 is more likely to be axially skewed. Correspondingly, the injection button assembly further comprises a resilient component 4 arranged between the button component 1 and the transmission component 2, the resilient component 4 is an axial linear spring, one end of the resilient component 4 abuts against the transmission component 2, and the other end abuts against the low-friction component 3, and the resilient component 4 is used to provide an elastic force to maintain the low-friction component 3 and the button component 1 in contact, so that the proximal end surface 31 of the low-friction component 3 and the first contact surface 11 of the button component 1 are kept in contact, reducing the axial skewing of the low-friction component 3 due to its own shaking.

[0066] Further, the linear spring may be bent away from its axis during compression, reducing the coaxiality between the button component 1 and the transmission component 2; in some embodiments, one of the button component 1 and the transmission component 2 is centrally provided with an axial column extending in the axial direction for the linear spring to be sleeved, and the other is provided with a surrounding sleeve 13 capable of surrounding the end of the axial column and accommodating the end of the linear spring, and the combination of the axial column and the surrounding sleeve 13 provides good guidance and limiting effect on the linear spring, avoiding excessive bending away from its axis during compression of the linear spring. Referring to Figure 2 and Figure 3 In this embodiment, the axial column is a positioning sleeve 22 on the transmission component 2, and the surrounding sleeve 13 is arranged on the button component 1.

[0067] The main working principle of the injection button assembly disclosed in this embodiment is as follows: during the injection process after the user sets the dose, the axial pushing force of the user is applied to the button component 1, and the axial pushing force is transmitted to the transmission component 2 through the low-friction component 3, and the axial pushing force is transmitted to the dose setting component 8 through the transmission component 2, so that the dose setting component 8 is screwed back into the housing 7; during this process, the transmission component 2 rotates relative to the button component 1 following the dose setting component 8, and the low-friction component 3 can at least rotate relative to one of the transmission component 2 and the button component 1, and the low-friction component 3 is configured as a low-friction gasket or is provided with a low-friction contact surface, so that the dynamic friction coefficient between the low-friction component 3 and the component relative to which it can rotate is configured to be less than the reference friction coefficient between the button component 1 and the transmission component 2, thereby reducing the frictional resistance during the injection process of the user, and further reducing the injection resistance of the user.

[0068] The embodiment also discloses a pressing driving mechanism applied to an injection device.

[0069] Referring to Figures 9 to 14 , a press drive mechanism comprises a housing 7, a dose setting member 8, a clutch member 9, a drive member 10 and the above-mentioned injection button assembly; wherein the housing 7, the dose setting member 8, the clutch member 9 and the drive member 10 all extend along the axial direction, the housing 7 is in a cylindrical shape, the dose setting member 8 is arranged in the housing 7, and the outer wall of the dose setting member 8 is connected with the inner thread of the housing 7, so that the dose setting member 8 can be screwed out of the housing 7 or screwed back into the housing 7. The clutch member 9 is in a rod shape, and is arranged in the dose setting member 8. In combination Figure 11 and Figure 12 , in the embodiment, the dose setting member 8 comprises an enlarged head end 81 at the proximal end, the clutch member 9 is arranged in the enlarged head end 81, and the proximal end of the clutch member 9 has a radially outward protruding protruding ring 91, the protruding ring 91 abuts against the bottom in the enlarged head end 81, so as to limit the relative position of the clutch member 9 and the dose setting member 8 in the axial direction.

[0070] Meanwhile, the injection button assembly is at least partially arranged in the enlarged head end 81 of the dose setting member 8, and the distal end of the transmission member 2 in the injection button assembly abuts against the groove bottom of the proximal end groove 92 of the clutch member 9. In actual use of the injection device, the user first sets the dose through the dose setting member 8, so that the dose setting member 8 is in the state of being screwed out of the housing 7; then when the user performs the injection operation by pressing the injection button assembly, the axial pushing force of the user is first applied to the button member 1, and is sequentially transmitted to the dose setting member 8 through the low friction member 3, the transmission member 2 and the clutch member 9, so that the dose setting member 8 is screwed back into the housing 7 under the action of the axial pushing force.

[0071] In addition, the proximal end of the injection button assembly and the dose setting member 8 are provided with an anti-disengagement structure, which prevents the injection button assembly and the dose setting member 8 from being completely disengaged by setting the anti-disengagement structure; referring to Figure 11 and Figure 13 , specifically in the embodiment, the inner side wall of the enlarged head end 81 of the dose setting member 8 is radially inwardly provided with an anti-disengagement protruding ring 811, the button member 1 comprises an axially extending annular outer wall 14, the outer side wall of the annular outer wall 14 is provided with a matching ring groove 141 for accommodating the anti-disengagement protruding ring 811, the axial groove distance of the matching ring groove 141 is greater than the axial thickness of the anti-disengagement protruding ring 811, so that the button member 1 can move axially relative to the dose setting member 8 by a certain amount; meanwhile, the anti-disengagement buckle 142 is formed between the distal end of the annular outer wall and the matching ring groove 141, which cooperates with the anti-disengagement protruding ring 811 and is used to prevent the button member 1 from being disengaged from the enlarged head of the dose setting member 8 in the direction of pointing from the distal end to the proximal end. Accordingly, referring to Figure 9 and Figure 10, the low-friction part 3, the elastic part 4 and the transmission part 2 in the push button assembly are all in the enlarged head part distal to the button part 1, the cooperation between the anti-tripping position 142 and the anti-tripping convex ring 811 prevents the button part 1 from being separated from the proximal end of the dose setting part 8, that is, the entire push button assembly can be prevented from being completely separated from the dose setting part 8.

[0072] As described above, during the injection, the axial pushing force applied by the user is transmitted to the dose setting part 8 through the transmission part 2 and the clutch part 9, so that the dose setting part 8 is helically moved to the distal end to retreat into the housing 7; further, the transmission part 2, the clutch part 9 and the dose setting part 8 form a fixed rotation direction during the injection, so that the aforementioned three parts are synchronously rotated during the injection. Referring to Figure 12 and Figure 14 , in particular, in the embodiment, the distal end of the transmission part 2 is provided with first meshing teeth 23, and the groove bottom of the proximal end groove 92 of the clutch part 9 is correspondingly provided with second meshing teeth 921 cooperating with the first meshing teeth 23, under the action of the axial pushing force, the first meshing teeth 23 are engaged with the second meshing teeth 921, so that the transmission part 2 and the clutch part 9 are synchronously rotated; meanwhile, referring to Figure 11 and Figure 14 , the side wall of the transmission part 2 is provided with a ratchet arm 24, and the inner wall of the enlarged head end 81 of the dose setting part 8 is configured with a ratchet tooth ring 812 cooperating with the ratchet arm 24, through the cooperation between the ratchet arm 24 and the ratchet tooth ring 812, the dose setting part 8 is relatively rotated with the transmission part 2 when the dose setting part 8 is rotated in the first direction of helically extending out of the housing 7, and the dose setting part 8 drives the transmission part 2 to rotate when the dose setting part 8 is rotated in the second direction of helically retreating into the housing 7. Specifically, taking the proximal end toward the distal end as the observation angle, the first direction is the clockwise direction, and the second direction is the counterclockwise direction.

[0073] Referring to Figure 9 , the drive part 10 is rotatably installed in the housing 7 and is relatively fixed in the axial position with the housing 7, meanwhile, the clutch part 9 is sleeved outside the drive part 10, and the axial groove-rib sliding cooperation structure is arranged between the drive part 10 and the clutch part 9, so that the clutch part 9 can be axially moved relative to the drive part 10, and can drive the drive part 10 to synchronously rotate. As known from the foregoing, during the injection, the push button assembly pushes the dose setting part 8 to helically retreat into the housing 7, the dose setting part 8 drives the clutch part 9 to helically move, and the clutch part 9 drives the drive part 10 to rotate, that is, the entire power transmission process of the pressing drive mechanism is completed.

[0074] And in the actual application of the injection device also includes a screw, the drive member 10 in the push drive mechanism and the housing 7 can be with the screw nut screw transmission cooperation, so that the drive member 10 relative to the housing 7 rotation can drive the screw to the distal end of the injection device advancement, to achieve the purpose of bolus.

[0075] The dose setting member 8, the clutch member 9, the drive member 10 in the button drive mechanism can be used in the market of each dose setting member 8, clutch member 9, drive member 10, as long as the corresponding role can be played, but by combining the bolus button assembly with the housing 7, dose setting member 8, clutch member 9, drive member 10, can reduce the resistance when the user uses the injection device with the button drive mechanism to implement the bolus operation.

[0076] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the description of the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0077] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A bolus button assembly comprising a button member and a drive member, the button member and the drive member being relatively rotatable during a bolus process, characterized in that, The push button assembly further comprises a low-friction component for transmitting the pushing force received by the button component to the transmission component; the dynamic friction coefficient between the button component and the transmission component is defined as a reference friction coefficient; The low-friction component rotates relative to the button component during the push injection, and the dynamic friction coefficient between the low-friction component and the button component is defined as a first friction coefficient, which is configured to be smaller than the reference friction coefficient; And / or, the low-friction component rotates relative to the transmission component during the push injection, and the dynamic friction coefficient between the low-friction component and the transmission component is defined as a second friction coefficient, which is configured to be smaller than the reference friction coefficient.

2. The bolus button assembly of claim 1, wherein, During the push injection, the low-friction component can rotate relative to the button component, and the low-friction component can rotate relative to the transmission component.

3. The bolus button assembly of claim 2, wherein, The low-friction component comprises a proximal end face and a distal end face arranged opposite in the push direction, the button component comprises a first abutting face abutting the proximal end face of the low-friction component, and the transmission component comprises a second abutting face abutting the distal end face of the low-friction component; The proximal end face of the low-friction component and one of the first abutting faces are provided with a first abutting protrusion protruding axially towards the other; and / or, the distal end face of the low-friction component and one of the second abutting faces are provided with a second abutting protrusion protruding axially towards the other.

4. The bolus button assembly of claim 2, wherein, The button component or the transmission component is centrally provided with an axially extending positioning column, and the low-friction component is centrally provided with a positioning hole, and the positioning column is arranged through the positioning hole.

5. The bolus button assembly of claim 4, wherein, One of the button component and the transmission component is centrally provided with an axially extending positioning column, and the other is provided with a positioning sleeve capable of being sleeved outside the positioning column.

6. The bolus button assembly of claim 5, wherein, One of the outer wall of the positioning column and the inner wall of the positioning sleeve is provided with a radial abutting protrusion close to the other in the radial direction.

7. The bolus button assembly of claim 2, wherein, The push button assembly further comprises a resilient component arranged between the button component and the transmission component, and the button component can be axially moved from a first position to a second position closer to the transmission component during the push injection, and the resilient component is used to provide an elastic force for maintaining the low-friction component and the button component in an abutting state.

8. The bolus button assembly of claim 1, wherein, One of the button component and the transmission component is fixed to the low-friction component in the rotation direction, and the other can rotate relative to the low-friction component.

9. The bolus button assembly of claim 1, wherein, The low-friction component is configured as a PTFE sheet or a graphite sheet.

10. A press drive mechanism characterized by, The injection device comprises a housing, a dose setting member threadedly connected to the housing, a clutch member, a drive member and a bolus button assembly as claimed in any one of claims 1 to 9, the bolus button assembly being at least partially housed in a proximal end of the dose setting member, and an anti-rotation structure being provided between the bolus button assembly and the proximal end of the dose setting member for preventing the bolus button assembly from completely disengaging from the dose setting member; the dose setting member being helically retracted into the housing under the axial thrust force applied to the bolus button assembly, the drive member, the clutch member and the dose setting member being rotationally fixed during the bolus injection; the drive member and the clutch member being rotationally locked and axially movable relative to each other.

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