Dosing assembly and injection device

Abstract

The utility model relates to the technical field of medical injection devices, in particular to a dosing assembly and an injection device.The dosing assembly comprises a first element and a second element arranged on the first element in a penetrating mode, and the first element and the second element can spirally move relative to each other; one of the inner side wall of the first element and the outer side wall of the second element is provided with a radial abutting rib, and the other one of the inner side wall of the first element and the outer side wall of the second element is provided with an abutting matching part for abutting against the radial abutting rib. When the central axis of the first element coincides with the central axis of the second element, a first gap is formed between the inner side wall of the first element and the outer side wall of the second element, a second gap is formed between the radial abutting rib and the abutting matching part, and the second gap is smaller than the first gap. According to the application, the frictional resistance of the first element and the second element can be reduced, so that the dose injection smoothness is improved.

Description

Technical Field

[0001] This application relates to the technical field of injection devices, and in particular, to a metering assembly and an injection device. Background Art

[0002] When injecting drugs, a specific injection device is used, which is usually called a pen-type syringe or an injection pen. It can be adjusted by the user based on the need and the adjusted dose can be delivered. Specifically, referring to Figure 1 , the injection device mainly includes a metering assembly and a transmission assembly 9, and during actual use, the injection device is connected to a cartridge 10 and a needle assembly 11; among them, the metering assembly is used for the user to adjust the injection dose, and then the user starts the dose injection action, and transmits the thrust to the cartridge 10 through the transmission assembly 9; correspondingly, the cartridge 10 contains drugs, and one end of the cartridge 10 is used to withstand the thrust of the transmission assembly 9, and the other end is connected to the needle assembly 11, so as to realize the injection of drugs under the thrust of the transmission assembly 9.

[0003] In the related art, the metering assembly usually includes a housing 5 and a graduated rod 6 threadedly connected to the housing 5. During the dose adjustment process, the graduated rod 6 is spirally extended from the initial position relative to the housing 5 under the drive of the user, and the extended distance of the graduated rod 6 is associated with the set dose; at the same time, during the dose injection process, the graduated rod 6 is spirally retracted to the initial position relative to the housing 5 due to the execution of the injection action. Correspondingly, the transmission assembly 9 is operably coupled to the graduated rod 6 to convert the movement of the graduated rod 6 into thrust and transmit it to the cartridge 10 during the dose injection process, and finally achieve the purpose of drug injection.

[0004] In an injection device, a mating gap is usually provided between two relatively moving and contacting components to avoid the limitation of relative movement between the two; correspondingly, a radial gap is provided between the graduated rod 6 and the housing 5 in the metering assembly. The existence of the radial gap causes the central axis of the graduated rod 6 to be relatively inclined with respect to the central axis of the housing 5, and contact friction will occur between the two, which will reduce the smoothness during the dose injection process. Summary of the Utility Model

[0005] In a first aspect, in order to improve the smoothness of the injection device during the dose injection process, this application provides a metering assembly.

[0006] The metering assembly provided by this application adopts the following technical solutions:

[0007] A metering assembly includes a first element and a second element passing through the first element. The first element and the second element can move spirally relative to each other. One of the inner sidewall of the first element and the outer sidewall of the second element is provided with a radial abutting rib, and the other is provided with an abutting mating portion for the radial abutting rib to abut against; when the central axes of the first element and the second element coincide, a first gap is formed between the inner sidewall of the first element and the outer sidewall of the second element, and a second gap is formed between the radial abutting rib and the abutting mating portion, and the second gap is smaller than the first gap.

[0008] By adopting the above technical solution, the second gap between the radial abutting rib and the abutting mating portion is smaller than the first gap between the inner sidewall of the first element and the outer sidewall of the second element, which can reduce the degree of relative inclination of the central axes between the first element and the second element when the first element and the second element are driven to move spirally relative to each other, that is, to maintain good coaxiality between the first element and the second element to maintain good smoothness during the dose injection process; at the same time, during the relative spiral movement of the first element and the second element, there is a region where the adjacent sidewalls of the two abut against each other and slide friction occurs. In this solution, the small-area contact formed by setting the radial abutting rib and the abutting mating portion is used to replace the large-area contact between the inner sidewall of the first element and the outer sidewall of the second element, so as to reduce the frictional resistance between the first element and the second element, thereby achieving the purpose of improving the smoothness of dose injection.

[0009] Further, one of the first element and the second element is provided with a helical groove, and the other is provided with a helical rib matching the helical groove.

[0010] Further, the metering assembly further includes a third element; wherein, the third element is relatively fixed to the first element, the first element is the housing of the injection device or fixedly connected to the housing of the injection device, and one of the third element and the second element is provided with a helical groove, and the other is provided with a helical rib matching the helical groove; or, the third element is relatively fixed to the second element, the second element is the housing of the injection device or fixedly connected to the housing of the injection device, and one of the third element and the first element is provided with a helical groove, and the other is provided with a helical rib matching the helical groove.

[0011] Further, the first element and the second element move relative to each other along a first helix, and the radial abutting rib extends along a second helix; the helical directions and pitches of the first helix and the second helix are the same.

[0012] Further, the metering assembly includes at least two groups of radial abutting ribs arranged at intervals along the axial direction.

[0013] Furthermore, the spiral rib has a first side wall and a second side wall opposite to each other in the axial direction, and the spiral groove has a first groove wall and a second groove wall opposite to each other in the axial direction; when the first element and the second element spirally move relative to each other to perform dose injection, the first side wall abuts against the first groove wall, and the second side wall and the second groove wall have a third gap.

[0014] By adopting the above technical solution, during the dose pushing process, the first side wall and the first groove wall are in contact with each other with frictional resistance, while the second side wall and the second groove wall have a third gap and no frictional resistance exists, thereby reducing the frictional resistance when the first element and the second element rotate relative to each other, thereby achieving the purpose of improving the smoothness of dose pushing of the injection device.

[0015] Further, the spiral rib has a first side wall and a second side wall that are opposite to each other in the axial direction, and the spiral groove has a first groove wall and a second groove wall that are opposite to each other in the axial direction; when the first element and the second element spirally move relative to each other to perform dose injection, the first side wall abuts against the first groove wall; the plane perpendicular to the central axis of the dosing component is defined as the first plane, and the plane passing through the central axis of the dosing component is defined as the second plane; the first side wall of the spiral rib intersects with the second plane to form a first side edge, and the first side edge forms a first angle with the first plane; the first groove wall of the spiral groove is intersected by the second plane to form a first groove edge, and the first groove edge forms a second angle with the first plane; the first angle is not equal to the second angle, so that the first side wall and the first groove wall are in line contact.

[0016] By adopting the above technical solution, the first angle and the second angle are set to be unequal, so that the first side edge and the first groove edge intersect at one point, that is, the first side wall and the first groove wall form a line contact, thereby reducing the contact area between the spiral rib and the spiral groove, thereby achieving the purpose of reducing friction resistance and thus improving the smoothness of dose injection.

[0017] Furthermore, the spiral rib has a first side wall and a second side wall opposite to each other in the axial direction, and the spiral groove has a first groove wall and a second groove wall opposite to each other in the axial direction; when the first element and the second element spirally move relative to each other to perform dose injection, the first side wall abuts against the first groove wall; one of the first side wall and the first groove wall is provided with a protrusion, and the other is provided with a contact portion for the protrusion to abut against.

[0018] By adopting the above technical solution, compared with the situation where the first side wall and the second groove wall completely abut each other, the abutment between the protrusion and the abutment portion can reduce the contact area between the spiral rib and the spiral groove, thereby achieving the purpose of reducing friction resistance and thus improving the smoothness of dose injection.

[0019] Further, the spiral rib has a first side wall and a second side wall facing away from each other in the axial direction, and the spiral groove has a first groove wall and a second groove wall facing each other in the axial direction; when the first element and the second element perform a spiral movement relative to each other for dose pushing, the first side wall abuts against the first groove wall; one of the first side wall and the first groove wall is an arc-shaped protruding surface, and the other abuts against the arc-shaped protruding surface to form a line contact.

[0020] In a second aspect, in order to improve the smoothness of the injection device during dose pushing, the present application provides an injection device.

[0021] An injection device provided by the present application adopts the following technical solutions:

[0022] An injection device includes the above-mentioned metering assembly and transmission assembly.

[0023] In summary, the present application at least includes the following beneficial effects:

[0024] The second gap between the radial abutting rib and the abutting mating part is smaller than the first gap between the inner side wall of the first element and the outer side wall of the second element, so that when the first element and the second element are driven to perform a relative spiral movement, the degree of relative inclination of the central axes between the first element and the second element can be reduced, and the large-area contact between the inner side wall of the first element and the outer side wall of the second element is replaced by the small-area contact formed by the radial abutting rib and the abutting mating part, thereby reducing the frictional resistance between the first element and the second element, so as to achieve the purpose of improving the smoothness of dose pushing. Description of the Drawings

[0025] Figure 1 is a schematic diagram of the injection device pointed out in the background art of the present application;

[0026] Figure 2 is a schematic diagram of the metering assembly in the embodiment of the present application Figure 1 ;

[0027] Figure 3 is a schematic diagram of the metering assembly in the embodiment of the present application Figure 2 ;

[0028] Figure 4 is a schematic diagram of the metering assembly in the embodiment of the present application Figure 3 ;

[0029] Figure 5 is a schematic diagram of the metering assembly in the embodiment of the present application Figure 4 ;

[0030] Figure 6 is a partial schematic diagram for showing the first element, the second element and the radial abutting rib in the embodiment of the present application Figure 1 ;

[0031] Figure 7 It is a partial schematic diagram for showing the first element, the second element and the radial abutting rib in the embodiment of the present application Figure 2 ;

[0032] Figure 8 It is a partial schematic diagram for showing the matching structure of the spiral rib and the spiral groove in the embodiment of the present application Figure 1 ;

[0033] Figure 9 It is a partial schematic diagram for showing the matching structure of the spiral rib and the spiral groove in the embodiment of the present application Figure 2 ;

[0034] Figure 10 It is a partial schematic diagram for showing the matching structure of the spiral rib and the spiral groove in the embodiment of the present application Figure 3 ;

[0035] Figure 11 It is a partial schematic diagram for showing the matching structure of the spiral rib and the spiral groove in the embodiment of the present application Figure 4 ;

[0036] Figure 12 It is a schematic diagram of the injection device in the embodiment of the present application

[0037] Explanation of reference numerals: 1, the first element; 2, the second element; 3, the radial abutting rib; 4, the abutting and matching part; 5, the housing; 51, the outer shell; 52, the inner shell; 6, the scale rod; 61, the scale element; 7, the spiral rib; 71, the first side wall; 711, the protruding part; 72, the second side wall; 8, the spiral groove; 81, the first groove wall; 82, the second groove wall; 9, the transmission assembly; 91, the transmission rod; 92, the driving rod; 93, the push rod; 10, the cartridge; 11, the needle assembly; 12, the threaded sleeve Detailed Description of the Embodiment

[0038] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions from beginning to end. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation to the present utility model

[0039] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality" is two or more.

[0040] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0041] Refer to Figure 1 , in the related art, an injection device mainly includes a metering assembly and a transmission assembly 9, and during actual use, the injection device is connected to a cartridge 10 and a needle assembly 11; among them, the metering assembly is used for the user to adjust the injection dose. After the user starts the dose injection action, the injection force is transmitted to the cartridge 10 through the transmission assembly 9; correspondingly, the cartridge 10 contains the drug, and one end of the cartridge 10 is used to bear the thrust of the transmission assembly 9, and the other end is connected to the needle assembly 11, so as to realize the injection of the drug under the thrust of the transmission and pushing assembly. Among them, the injection adjustment assembly generally includes a housing 5 and a scale rod 6 that can move spirally relative to the housing 5. During the dose adjustment process, the scale rod 6 spirally extends a certain distance relative to the housing 5 under the drive of the user, and the extension distance of the scale rod 6 is associated with the set dose; at the same time, during the dose injection process, the scale rod 6 spirally retracts to the initial position relative to the housing 5 due to the execution of the injection action. Correspondingly, during the dose injection period, the transmission assembly 9 is coupled to the scale rod 6 to convert the movement of the scale rod 6 into a thrust during the dose injection process and transmit it to the cartridge 10, and finally achieve the purpose of drug injection.

[0042] The embodiment of the present application discloses a metering assembly applied to an injection device.

[0043] Refer toFigures 2 - 5 The metering assembly includes a first element 1 and a second element 2 disposed through the first element 1, and the first element 1 and the second element 2 are capable of helical movement relative to each other; wherein, one of the first element 1 and the second element 2 is relatively fixed to the housing 5 of the injection device or configured as the housing 5 of the injection device, so that the other can helically extend or retract relative to the housing 5. In some specific embodiments, both the first element 1 and the second element 2 are cylindrical, and a clearance fit is provided between the first element 1 and the second element 2 to avoid restriction of relative movement between the two, which also causes the central axes of the first element 1 and the second element 2 to be relatively inclined during actual use. At the same time, one of the inner sidewall of the first element 1 and the outer sidewall of the second element 2 is provided with a radially extending radial abutting rib 3, and the other is provided with an abutting mating portion 4 for the radial abutting rib 3 to abut against. When the central axes of the first element 1 and the second element 2 coincide, a first gap is formed between the inner sidewall of the first element 1 and the outer sidewall of the second element 2, and a second gap is formed between the radial abutting rib 3 and the abutting mating portion 4; wherein, the second gap is configured to be smaller than the first gap.

[0044] Thus, during actual use, when the central axes between the first element 1 and the second element 2 are relatively inclined, the radial abutting rib 3 and the abutting mating portion 4 abut against each other to form a radial support between the first element 1 and the second element 2. Since the second gap is set to be smaller than the first gap, the degree of relative inclination of the central axes between the first element 1 and the second element 2 can be correspondingly reduced, thereby improving the coaxiality between the first element 1 and the second element 2, and further achieving the purpose of improving the smoothness of dose injection; in addition, the relative inclination of the central axes between the first element 1 and the second element 2 will also cause the two to have radial contact. Compared with the radial contact formed by the adjacent sidewalls of the first element 1 and the second element 2, the radial contact between the sidewalls of the first element 1 and the second element 2 in this solution through the radial abutting rib 3 and the abutting mating portion 4 significantly reduces the contact area, thereby reducing the frictional resistance when the first element 1 and the second element 2 move relative to each other, and further achieving the purpose of improving the smoothness of dose injection.

[0045] It should be noted that the first element 1 and the second element 2 can move spirally relative to each other. The first element 1 and the second element 2 can form a direct threaded connection, or the first element 1 and the second element 2 can achieve an indirect threaded connection through another component. At the same time, to enable one of the first element 1 and the second element 2 to move spirally relative to the housing 5 of the injection device, the other of the first element 1 and the second element 2 is configured as the housing 5 of the injection device or fixedly connected to the housing 5 of the injection device. That is, the first element 1 can be configured as the housing 5 and the second element 2 is threadedly connected to the first element 1, or the first element 1 can be configured to be fixedly connected to the housing 5 and the second element 2 is threadedly connected to the first element 1, or the second element 2 can be configured as the housing 5 and the first element 1 is threadedly connected to the second element 2, or the second element 2 can be configured to be fixedly connected to the housing 5 and the first element 1 is threadedly connected to the second element 2. Specifically, the following examples can be included:

[0046] Referring to Figure 2 , in some specific embodiments, the metering assembly includes a housing 5 and a graduated rod 6 disposed through the housing 5. The housing 5 and the graduated rod 6 are generally cylindrical, and a part of the graduated rod 6 is received in the housing 5. Among them, the housing 5 serves as the first element 1 as described above, and the graduated rod 6 serves as the second element 2 as described above. In this case, the radial contact formed by the cooperation of the radially abutting ribs 3 and the abutting mating portions 4 is between the graduated rod 6 and the housing 5. At the same time, the housing 5 and the graduated rod 6 are directly threadedly connected through the cooperating spiral ribs 7 and spiral grooves 8. In some embodiments, spiral ribs 7 are provided on the inner sidewall of the housing 5, and spiral grooves 8 are provided on the outer sidewall of the graduated rod 6 that cooperate with the spiral ribs 7. Through the cooperation of the spiral ribs 7 and the spiral grooves 8, the graduated rod 6 can be spirally extended or retracted relative to the housing 5. Alternatively, in some other embodiments, the spiral grooves 8 can be provided on the inner sidewall of the housing 5 and the spiral ribs 7 can be provided on the outer sidewall of the graduated rod 6.

[0047] Referring to Figure 3In other specific embodiments, the metering assembly includes a threaded sleeve 12, a scale rod 6 inserted into the threaded sleeve 12, and a housing 5, wherein the threaded sleeve 12 serves as the first element 1 mentioned above, is located within the housing 5 and is fixedly connected to the housing 5, and the scale rod 6 serves as the second element 2 mentioned above. In this case, radial contact formed by the radial interference ribs 3 and the interference fitting portion 4 is located between the threaded sleeve 12 and the scale rod 6. At the same time, the threaded sleeve 12 and the scale rod 6 are directly threadedly connected via the matching spiral ribs 7 and spiral grooves 8, thereby indirectly threading the scale rod 6 and the housing 5 via the threaded sleeve 12. The threaded connection between the threaded sleeve 12 and the scale rod 6 can be achieved by providing the spiral ribs 7 on the inner side wall of the threaded sleeve 12 and the spiral grooves 8 on the outer side wall of the scale rod 6, or by providing the spiral grooves 8 on the inner side wall of the threaded sleeve 12 and the spiral ribs 7 on the outer side wall of the scale rod 6.

[0048] Reference Figure 4 In other specific embodiments, the configuration assembly includes a scale rod 6 and a housing 5, wherein the housing 5 includes an inner shell 52 and an outer shell 51 that are fixedly connected. The scale rod 6 serves as the first element 1 mentioned above and is located inside the outer shell 51, and the inner shell 52 serves as the second element 2 mentioned above and is located inside the scale rod 6. In this case, the radial contact formed by the radial interference rib 3 and the interference fitting portion 4 is located between the scale rod 6 and the inner shell 52. At the same time, the scale rod 6 and the inner shell 52 are directly threadedly connected through the matching spiral rib 7 and spiral groove 8, thereby achieving an indirect threaded connection between the scale rod 6 and the outer shell 51 through the inner shell 52. The threaded connection between the scale rod 6 and the inner shell 52 can be specifically provided by providing the spiral rib 7 on the inner side wall of the scale rod 6 and the spiral groove 8 on the outer side wall of the inner shell 52, or by providing the spiral groove 8 on the inner side wall of the scale rod 6 and the spiral rib 7 on the outer side wall of the scale rod 6.

[0049] Reference Figure 5 In other specific embodiments, the configuration assembly includes a housing 5 and a scale rod 6, wherein the housing 5 includes an outer shell 51 and an inner shell 52 that are fixedly connected. The outer shell 51 serves as the first element 1 mentioned above and is sleeved outside the scale rod 6, and the scale rod 6 serves as the second element 2 mentioned above and is sleeved outside the inner shell 52. In this case, the radial contact formed by the radial interference rib 3 and the interference fitting portion 4 is located between the outer shell 51 and the scale rod 6. At the same time, the scale rod 6 and the inner shell 52 are directly threadedly connected through the matching spiral rib 7 and spiral groove 8, thereby achieving an indirect threaded connection between the scale rod 6 and the outer shell 51 through the inner shell 52. The threaded connection between the scale rod 6 and the inner shell 52 can be specifically provided by providing the spiral rib 7 on the inner side wall of the scale rod 6 and the spiral groove 8 on the outer side wall of the inner shell 52, or by providing the spiral groove 8 on the inner side wall of the scale rod 6 and the spiral rib 7 on the outer side wall of the scale rod 6.

[0050] It can be understood that one of the inner sidewall of the first element 1 and the outer sidewall of the second element 2 is provided with a radially extending radial abutting rib 3, and the other is provided with an abutting mating portion 4 for the radial abutting rib 3 to abut against. This means that the radial abutting rib 3 can be provided on the inner sidewall of the first element 1 and the abutting mating portion 4 can be provided on the outer sidewall of the second element 2, or the radial abutting rib 3 can be provided on the outer sidewall of the second element 2 and the abutting mating portion 4 can be provided on the inner sidewall of the first element 1. Specifically, referring to Figure 6 , in some embodiments, the radial abutting rib 3 is only provided on the inner sidewall of the first element 1. At this time, the radial contact between the first element 1 and the second element 2 is formed by the radial abutting rib 3 of the first element 1 and the abutting mating portion 4 of the second element 2; referring to Figure 7 , in some other embodiments, the radial abutting rib 3 is only provided on the outer sidewall of the second element 2. At this time, the radial contact between the first element 1 and the second element 2 is formed by the radial abutting rib 3 of the second element 2 and the abutting mating portion 4 of the first element 1; in addition, in some other embodiments, while the inner sidewall of the first element 1 is provided with the radial abutting rib 3, the second element 2 is also provided with the radial abutting rib 3. In this solution, a set of radial contacts between the first element 1 and the second element 2 is formed by the radial abutting rib 3 of the first element 1 and the abutting mating portion 4 of the second element 2, and another set of radial contacts between the first element 1 and the second element 2 is formed by the radial abutting rib 3 of the second element 2 and the abutting mating portion 4 of the first element 1.

[0051] Similarly, it can be understood that the function of the abutting mating portion 4 is to provide a place for the radial abutting rib 3 to abut against. In actual design, the abutting mating portion 4 can be flush with the sidewall where it is located, or can protrude or recess from the sidewall where it is located. Specifically, in some embodiments, the abutting mating portion 4 is a part of the sidewall where it is located and is flush with the sidewall where it is located, that is, the abutting mating portion 4 does not radially protrude or radially recess from the sidewall; while in some other embodiments, the abutting mating portion 4 is configured to be different from a part of the sidewall where it is located. For example, the abutting mating portion 4 is set as a block protruding radially relative to the sidewall or a groove recessed radially.

[0052] Furthermore, in some embodiments, the radial abutting rib 3 is configured to extend along a spiral line between the proximal end and the distal end of the sidewall where it is located. At the same time, the spiral line along which the first element 1 and the second element 2 perform a spiral movement is defined as the first spiral line, and the spiral extension line of the radial abutting rib 3 is the second spiral line; in some specific embodiments, the spiral direction and pitch of the first spiral line are configured to be the same as the spiral direction and pitch of the second spiral line. With the above settings, since the radial abutting rib 3 abuts against the abutting mating portion 4 to form a radial contact between the first element 1 and the second element 2, when the first element 1 and the second element 2 perform a relative spiral movement, the sliding friction direction generated by the radial contact between the first element 1 and the second element 2 will be basically consistent with the extension direction of the radial abutting rib 3.

[0053] Furthermore, the first element 1 and the second element 2 of the dosing assembly may be provided with only one set of radial contact ribs 3 and the interfering fitting portion 4 to form radial contact, or may be provided with two or more sets of radial contact ribs 3 and the interfering fitting portion 4 to form radial contact, and all radial contact ribs 3 are arranged at intervals along the axial direction to achieve better coaxiality between the first element 1 and the second element 2. At the same time, in the embodiment with two sets of radial contact ribs 3, the two sets of radial contact ribs 3 can be respectively provided on the proximal and distal sides of the axial direction of the spiral fitting structure; Figure 6 and Figure 7 In some specific embodiments, two groups of radial interference ribs 3 and spiral groove 8 are provided on the same side wall, and accordingly, one group of radial interference ribs 3 is located axially proximal to the spiral groove 8, and the other group of radial interference ribs 3 is located axially distal to the spiral groove 8. In other embodiments, two groups of radial interference ribs 3 and spiral rib 7 may be provided on the same side wall, and accordingly, one group of radial interference ribs 3 is located axially proximal to the spiral rib 7, and the other group of radial interference ribs 3 is located axially distal to the spiral rib 7.

[0054] Further, refer to Figure 8 and Figure 9 In some embodiments, the spiral rib 7 has a first sidewall 71 and a second sidewall 72 that are axially opposed to each other, and the spiral groove 8 has a first groove wall 81 and a second groove wall 82 that are axially opposed to each other. When the first element 1 and the second element 2 spirally move relative to each other for dose delivery, the first sidewall 71 abuts against the first groove wall 81, while a third gap is formed between the second sidewall 72 and the second groove wall 82. Consequently, during dose delivery, the first sidewall 71 and the first groove wall 81 abut against each other, generating frictional resistance due to their contact, while the second sidewall 72 and the second groove wall 82 generate no frictional resistance due to the third gap. This reduces frictional resistance during relative rotational movement between the first element 1 and the second element 2, thereby improving the smoothness of dose delivery in the injection device.

[0055] Furthermore, in some embodiments, the frictional resistance between the spiral rib 7 and the spiral groove 8 during the dose pushing process may be reduced by reducing the abutment area between the spiral rib 7 and the spiral groove 8 .

[0056] Reference Figure 8 and Figure 9, in some embodiments for reducing the contact area between the spiral rib 7 and the spiral groove 8, a plane perpendicular to the central axis of the metering assembly is defined as the first plane, and a plane passing through the central axis of the metering assembly is defined as the second plane; the first side wall 71 of the spiral rib 7 intersects with the second plane to form a first side edge, and the first side edge forms a first included angle a with the first plane; the first groove wall 81 of the spiral groove 8 is intersected by the second plane to form a first groove edge, and the first groove edge forms a second included angle b with the first plane. In some specific embodiments, the first included angle a is greater than the second included angle b, such that the first side edge and the first groove edge intersect at a point, that is, the first side wall 71 and the first groove wall 81 are in contact with each other to form a line contact; specifically refer to Figure 8 , the first included angle a is set to 19°, and the second included angle b is set to 17°. In some other specific embodiments, the first included angle a is less than the second included angle b, such that the first side edge and the first groove edge intersect at a point, that is, the first side wall 71 and the first groove wall 81 are in contact with each other to form a line contact; specifically refer to Figure 9 , the first included angle a is set to 4°, and the second included angle b is set to 17°. By configuring the contact between the first side wall 71 and the first groove wall 81 as a line contact, the contact area between the spiral rib 7 and the spiral groove 8 can be reduced, thereby achieving the purpose of reducing the frictional resistance and further improving the smoothness of the dose injection.

[0057] Refer to Figure 10 , in some other embodiments for reducing the contact area between the spiral rib 7 and the spiral groove 8, one of the first side wall 71 and the first groove wall 81 is provided with a protrusion 711, and the other is provided with a contact portion for the protrusion 711 to abut against. In some specific embodiments, the first side wall 71 is provided with the protrusion and the first groove wall 81 is provided with the contact portion; in some other specific embodiments, the first groove wall 81 is provided with the protrusion 711 and the first side wall 71 is provided with the contact portion. It should be noted that the contact area when the protrusion 711 abuts against the contact portion is smaller than the contact surface when the first side wall 71 and the first groove wall 81 directly abut against each other, and the specific structure of the protrusion 711 is not limited, and the cross-section can be rectangular, semi-circular or other shapes; correspondingly, the contact portion can be flush with the wall where it is located, or can protrude or recess from the wall where it is located.

[0058] Refer to Figure 11, in some embodiments for reducing the contact area between the spiral rib 7 and the spiral groove 8, one of the first side wall 71 and the first groove wall 81 is an arc-shaped protruding surface, and the other abuts against the arc-shaped protruding surface to form a line contact. In some specific embodiments, the first side wall 71 is an arc-shaped protruding surface, and the first groove wall 81 is a flat contact surface; in some other specific embodiments, the first side wall 71 is a flat contact surface, and the first groove wall 81 is an arc-shaped protruding surface; in some other specific embodiments, both the first side wall 71 and the second groove wall 82 are configured as arc-shaped protruding surfaces. It should be noted that the arc-shaped protruding surface means that its cross-section presents a protruding arc, and the flat contact surface means that its cross-section presents a straight line.

[0059] The embodiment of the present application also discloses an injection device including a metering assembly.

[0060] Referring to Figure 12 , in some specific embodiments, the injection device includes a metering assembly and a transmission assembly 9, and during actual use, the injection device is connected to a cartridge 10 and a needle assembly 11; wherein, the metering assembly is the metering assembly described above, and the metering assembly includes a first element 1 and a second element 2 that can move spirally relative to each other, and one of the first element 1 and the second element 2 is fixed relative to the housing 5 or configured as the housing 5, and the other can move spirally relative to the housing 5 for scale adjustment. For the convenience of subsequent description, the component that can move spirally relative to the housing 5 for scale adjustment is defined as the scale element 61; during dose adjustment, the scale element 61 can spiral out a distance from the initial position relative to the housing 5 as the adjusted scale, and during dose injection, the scale element 61 can spiral back to the initial position relative to the housing 5.

[0061] The transmission assembly 9 and the scale element 61 do not form a connection in the rotational direction during dose setting, but form a connection in the rotational direction during dose injection; specifically, the transmission assembly 9 includes a transmission rod 91, a drive rod 92, and a push rod 93. Among them, a clutch structure is provided between the transmission rod 91 and the scale element 61, and this clutch structure enables the transmission rod 91 and the scale element 61 to rotate relative to each other during dose setting, and rotate synchronously during dose injection. Correspondingly, the drive rod 92 is sleeved on the transmission rod 91 and forms an anti-rotation connection, the push rod 93 is inside the drive rod 92 and forms a threaded connection, and the push rod 93 is configured to be anti-rotationally connected to the housing 5 of the injection device and can move axially. Thus, during dose injection, the scale element 61 moves spirally relative to the housing 5 to the initial position, driving the transmission rod 91 and the drive rod 92 to rotate synchronously, and then converting it into an axial feed of the push rod 93 towards the cartridge 10; and the cartridge 10 contains a medicament, and can communicate with the outside through the needle assembly 11, so that the movement transmitted by the transmission assembly 9 can push the medicament in the cartridge 10 out through the needle assembly 11.

[0062] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0063] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present utility model, and the scope of the present utility model is defined by the claims and their equivalents.

Claims

1. A metering component, comprising a first element and a second element disposed through the first element, wherein the first element and the second element are capable of helical movement relative to each other, characterized in that, One of the inner sidewall of the first element and the outer sidewall of the second element is provided with a radially abutting rib, and the other is provided with an abutting mating portion for the radially abutting rib to abut against; when the central axes of the first element and the second element coincide, a first gap is formed between the inner sidewall of the first element and the outer sidewall of the second element, and a second gap is formed between the radially abutting rib and the abutting mating portion, and the second gap is smaller than the first gap.

2. The metering component according to claim 1, characterized in that, One of the first element and the second element is provided with a helical groove, and the other is provided with a helical rib that mates with the helical groove.

3. The metering assembly according to claim 1, wherein, The metering assembly further includes a third element; wherein, the third element is relatively fixed to the first element, the first element is the housing of the injection device or is fixedly connected to the housing of the injection device, and one of the third element and the second element is provided with a helical groove, and the other is provided with a helical rib that mates with the helical groove; or, The third element is relatively fixed to the second element, the second element is the housing of the injection device or is fixedly connected to the housing of the injection device, and one of the third element and the first element is provided with a helical groove, and the other is provided with a helical rib that mates with the helical groove.

4. The metering component according to claim 1, characterized in that, The first element and the second element move relative to each other along a first helix, and the radially abutting rib extends along a second helix; the helix directions and pitches of the first helix and the second helix are the same.

5. The metering assembly according to claim 4, characterized in that, The metering assembly includes at least two groups of radially abutting ribs arranged at intervals along the axial direction.

6. The metering component according to claim 2 or 3, characterized in that The helical rib has a first sidewall and a second sidewall that face away from each other in the axial direction, and the helical groove has a first groove wall and a second groove wall that face each other in the axial direction; when the first element and the second element move relative to each other in a spiral manner for dose injection, the first sidewall abuts against the first groove wall, and a third gap is formed between the second sidewall and the second groove wall.

7. The metering assembly according to claim 2 or 3, characterized in that, The helical rib has a first sidewall and a second sidewall that face away from each other in the axial direction, and the helical groove has a first groove wall and a second groove wall that face each other in the axial direction; when the first element and the second element move relative to each other in a spiral manner for dose injection, the first sidewall abuts against the first groove wall; A plane perpendicular to the central axis of the metering assembly is defined as the first plane, and a plane passing through the central axis of the metering assembly is defined as the second plane; the first sidewall of the helical rib intersects with the second plane to form a first side edge, and the first side edge forms a first angle with the first plane; the first groove wall of the helical groove is intersected by the second plane to form a first groove edge, and the first groove edge forms a second angle with the first plane; The first angle and the second angle are not equal, so that the first sidewall and the first groove wall form a line contact.

8. The metering assembly according to claim 2 or 3, characterized in that, The helical rib has a first sidewall and a second sidewall that face away from each other in the axial direction, and the helical groove has a first groove wall and a second groove wall that face each other in the axial direction; when the first element and the second element move relative to each other in a spiral manner for dose injection, the first sidewall abuts against the first groove wall; one of the first sidewall and the first groove wall is provided with a protruding portion, and the other is provided with an abutting portion for the protruding portion to abut against.

9. The metering assembly according to claim 2 or 3, characterized in that, The spiral rib has a first side wall and a second side wall facing away from each other in the axial direction, and the spiral groove has a first groove wall and a second groove wall opposite to each other in the axial direction; when the first element and the second element perform spiral movement relative to each other for dose pushing, the first side wall abuts against the first groove wall; one of the first side wall and the first groove wall is an arc-shaped protruding surface, and the other abuts against the arc-shaped protruding surface to form a line contact.

10. An injection device, characterized in that, Comprising the metering assembly and the transmission assembly according to any one of claims 1-9.

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