Dose dial mechanism for an energy storage injection pen

Abstract

A dose back-off mechanism of an energy storage injection pen, comprising a support sleeve, which can rotate to set dose, back off dose and trigger injection action; an energy storage sleeve, which is installed outside the support sleeve and linked with the support sleeve to adjust dose and execute injection action according to dose; a fixed gear, which is installed at the front end of the energy storage sleeve and can limit the rotation of the energy storage sleeve, when the fixed gear is engaged with the energy storage sleeve, the energy storage sleeve can rotate relative to the fixed gear to set dose or the energy storage sleeve can drive the fixed gear to rotate synchronously, when the fixed gear is disengaged from the energy storage sleeve, the energy storage sleeve can rotate relative to the fixed gear to back off dose; a transmission sleeve, which is used to connect the support sleeve and the energy storage sleeve to realize linkage and push away the fixed gear to disengage the fixed gear from the energy storage sleeve. The present application can set dose, back off dose and better adjust dose.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of injection, and particularly relates to a dose back-calling mechanism of an energy storage injection pen. BACKGROUND

[0002] CN 108578834 B discloses an injection device having a housing in which an accommodation for a container with injection liquid is configured. The injection device has a manipulation element for adjusting an injection dose and a dosing unit which is moved relative to the housing when the injection dose is adjusted. The dosing unit has a zero position and at least one injection position. In the zero position, no dose is adjusted, and in each injection position, a set dose of injection liquid is adjusted. The injection device has a latching device which acts between two components which are moved relative to each other when the injection dose is adjusted, wherein each injection position of the dosing unit is associated with a latching position of the latching device. The dosing unit can be adjusted into at least one intermediate position in which no set dose of injection liquid is adjusted. A spring acts between the dosing unit and the housing, which, when the manipulation element is not operated, calls the dosing unit back from the intermediate position into an injection position or into the zero position.

[0003] The back-calling of this structure is only to call the dosing unit back into an injection position or into the zero position, and cannot realize the back-calling of the injection dose, i.e. cannot realize dose correction. SUMMARY

[0004] In view of the problems in the above background art, the purpose of the present application is to provide a dose back-calling mechanism of an energy storage injection pen which can realize dose correction.

[0005] The technical solution adopted by the present application is:

[0006] A dose back-calling mechanism of an energy storage injection pen, comprising

[0007] a support sleeve which can rotate for dose setting, dose back-calling, and triggering an injection action;

[0008] an energy storage sleeve which is installed outside the support sleeve and is linked with the support sleeve to realize dose adjustment and perform an injection action according to a dose;

[0009] a fixed gear which is installed at the front end of the energy storage sleeve and can mesh with the energy storage sleeve to limit the rotation direction of the energy storage sleeve, when the fixed gear meshes with the energy storage sleeve, the energy storage sleeve can rotate relative to the fixed gear for dose setting, or the energy storage sleeve can drive the fixed gear to rotate synchronously, and when the fixed gear is disengaged from the energy storage sleeve, the energy storage sleeve can rotate relative to the fixed gear for dose back-calling;

[0010] The transmission sleeve is used for connecting the support sleeve and the energy storage sleeve to realize linkage and push away the fixed gear to make the fixed gear disengage from the energy storage sleeve.

[0011] Further, the support sleeve is provided with a dose setting knob, which can drive the support sleeve to set dose and dose back when rotating.

[0012] Further, the rear end of the support sleeve is provided with a button for pressing the rear drive support sleeve to move axially.

[0013] Further, the energy storage sleeve is provided with a torsion spring for storing driving force and driving the energy storage sleeve to rotate to execute injection or dose adjustment.

[0014] Further, one end of the torsion spring is connected with a notch on the inner wall of the energy storage sleeve, and the other end is connected with the shell of the energy storage injection pen.

[0015] Further, the front end of the fixed gear is provided with a reverse limiting part which can rotate synchronously, and the reverse limiting part and the fixed gear are provided with a spring for axially supporting the fixed gear to engage with the energy storage sleeve.

[0016] Further, the fixed gear can engage with the shell of the energy storage injection pen to stop during dose adjustment.

[0017] Further, the fixed gear and the energy storage sleeve are connected through one-way teeth.

[0018] Further, the rear end of the transmission sleeve is provided with a first rib position, one side of the first rib position is a first straight surface, and the other side is a first inclined surface, the front end of the energy storage sleeve is internally provided with a first groove matched with the first rib position, the matched surface of the first groove and the first straight surface is a second straight surface, and the matched surface of the first groove and the first inclined surface is a second inclined surface, during dose setting, the first straight surface and the second straight surface are matched to make the energy storage sleeve and the transmission sleeve rotate in linkage, and during dose back, the first inclined surface and the second inclined surface are displaced, the transmission sleeve moves axially to make the fixed gear disengage from the energy storage sleeve.

[0019] Further, the front end of the support sleeve is provided with a first vertical groove, and the inside of the transmission sleeve is provided with a first vertical rib position which can be embedded into the first vertical groove.

[0020] Compared with the prior art, the present application has the following advantages: not only dose setting but also dose back can be realized, so that the dose can be better adjusted. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1is the schematic diagram of the explosion structure of the present application.

[0022] Figure 2 is the schematic diagram of the structure of the present application.

[0023] Figure 3 is the schematic diagram of the Figure 2 is the schematic diagram of the structure after removing the button and the dose setting knob.

[0024] Figure 4 is the schematic diagram of the Figure 2 is the schematic diagram of the structure after removing the dose setting knob.

[0025] Figure 5 is the schematic diagram of the Figure 3 is the schematic diagram of the structure after removing the energy storage sleeve.

[0026] Figure 6 is the schematic diagram of the part structure of the present application matched with the screw rod.

[0027] Figure 7 is the schematic diagram of the matching relationship between the support sleeve and the energy storage sleeve of the present application.

[0028] Figure 8 is the schematic diagram of the matching relationship between the energy storage sleeve and the torsion spring of the present application.

[0029] Figure 9 is the schematic diagram of the structure of the support sleeve of the present application.

[0030] Figure 10 is the schematic diagram of the structure of the dose setting knob of the present application.

[0031] Figure 11 is the schematic diagram of the structure of the fixed gear of the present application.

[0032] Figure 12 is the schematic diagram of the structure of the transmission sleeve of the present application.

[0033] Figure 13 is the schematic diagram of the structure of the energy storage sleeve of the present application.

[0034] Figure 14 is the schematic diagram of the structure of the screw rod of the present application.

[0035] Figure 15 is the schematic diagram of the structure of the reverse limiting of the present application.

[0036] Wherein, 1, support sleeve, 11, third vertical rib position, 12, first vertical groove, 13, third rib position, 14, inner wall rib position; 2, dose setting knob, 21, second vertical rib position; 3, button, 31, outer wall rib position; 4, fixed gear, 41, second one-way tooth, 42, vertical tooth, 43, second vertical groove; 5, spring; 6, transmission sleeve, 61, first rib position, 611, first inclined surface, 612, first straight surface, 62, first vertical rib position; 7, energy storage sleeve, 71, second rib position, 72, first one-way tooth, 73, first groove, 731, second inclined surface, 732, second straight surface; 8, torsion spring; 9, screw; 10, reverse limit, 101, cantilever, 102, fourth vertical rib position. DETAILED DESCRIPTION

[0037] The present application is further described in connection with the specific embodiments disclosed herein, by which the principles of the present application should not be limited. It will be apparent to those skilled in the art that various modifications and variations can be made to the present application without departing from the scope or spirit of the claims.

[0038] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more, unless otherwise explicitly limited.

[0039] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0040] In the present application, unless otherwise explicitly specified and limited, "on" or "under" of a first feature to a second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, "on", "above" and "over" of a first feature to a second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is higher in horizontal height than the second feature. "Under", "below" and "underneath" of a first feature to a second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the first feature is lower in horizontal height than the second feature.

[0041] Referring to Figures 1-15 The present embodiment provides a dose back-off mechanism of an energy storage injection pen, comprising

[0042] A support sleeve 1 which can rotate for dose setting, dose back-off, and can trigger injection action;

[0043] An energy storage sleeve 7 which is mounted outside the support sleeve 1 and linked with the support sleeve 1 to realize dose adjustment and perform injection action according to dose;

[0044] A fixed gear 4 which is mounted at the front end of the energy storage sleeve 7 and can limit the rotation direction of the energy storage sleeve 7, when the fixed gear 4 is engaged with the energy storage sleeve 7, the energy storage sleeve 7 can rotate relative to the fixed gear 4 for dose setting, or the energy storage sleeve 7 can drive the fixed gear 4 to rotate synchronously, when the fixed gear 4 is disengaged from the energy storage sleeve 7, the energy storage sleeve 7 can rotate relative to the fixed gear 4 for dose back-off;

[0045] A transmission sleeve 6 which is used to connect the support sleeve 1 and the energy storage sleeve 7 to realize linkage, and can push away the fixed gear 4 so that the fixed gear 4 is disengaged from the energy storage sleeve 7.

[0046] The support sleeve 1 of the present embodiment is provided with a dose setting knob 2, when the dose setting knob 2 rotates, it can drive the support sleeve 1 to perform dose setting and dose back-off, and the support sleeve 1 can move axially relative to the dose setting knob 2 to trigger injection action. The inside of the dose setting knob 2 is provided with a second vertical rib position 21, and the support sleeve 1 is correspondingly provided with a third vertical rib position 11 which cooperates with the second vertical rib position 21, when the second vertical rib position 21 is engaged with the third vertical rib position 11, the rotation of the dose setting knob 2 can drive the support sleeve 1 to rotate. The support sleeve 1 can move axially relative to the dose setting knob 2 to move away from the engagement position and then rotate.

[0047] The rear end of the support sleeve 1 is provided with a button 3 for pressing the rear drive support sleeve 1 to move axially. Specifically, the button 3 has an inner sleeve arranged in the rear end of the support sleeve 5 and axially fixedly matched with the inner wall rib 14 of the support sleeve 1 through the outer wall rib 31, so that the button 3 does not fall off. When the button 3 is pressed, the support sleeve 1 can move axially, thereby driving the energy storage sleeve 7 to move forward.

[0048] The energy storage sleeve 7 is provided with a torsion spring 8 for driving the energy storage sleeve 7 to rotate to perform an injection action or dose adjustment after accumulating driving force. One end of the torsion spring 8 is connected with the notch 75 on the inner wall of the energy storage sleeve 7, and the other end is connected with the shell (not shown in the figure) of the energy storage injection pen. The end connected with the shell is fixed, and the torsion spring 8 rotates to store energy when the energy storage sleeve 7 rotates.

[0049] The front end of the fixed gear 4 is provided with a reverse limiting 10 which can rotate synchronously with the fixed gear 4. The reverse limiting 10 and the fixed gear 4 are provided with a spring 5 for axially supporting the fixed gear 4 to engage with the energy storage sleeve 7. Specifically, the fixed gear 4 is provided with a second vertical groove 43, and the inner wall of the reverse limiting 10 is provided with a fourth vertical rib 102. The second vertical groove 43 cooperates with the fourth vertical rib 102, and the reverse limiting 10 and the fixed gear 4 can rotate synchronously, and of course the fixed gear 4 can move axially relative to the reverse limiting 10. During dose adjustment, the fixed gear 4 can be supported by the spring 5, so that the vertical teeth 42 are not separated from the shell, and at the same time the first one-way tooth 72 and the second one-way tooth 41 are also pressed together by the spring 5. The reverse limiting 10 can drive the screw rod 9 to rotate synchronously. The reverse limiting 10 is provided with a cantilever 101 which can cooperate with the shell to make the reverse limiting 10 rotate in one direction only.

[0050] The fixed gear 4 can be engaged with the housing of the energy storage injection pen to stop when the dose is adjusted. The fixed gear 4 is engaged with the energy storage sleeve 7 through one-way teeth. When the support sleeve 1 rotates in the dose setting direction, the transmission sleeve 6 rotates to drive the energy storage sleeve 7 to rotate, and then the torsional spring 8 rotates to store energy. At this time, the fixed gear 4 is engaged with the housing to stop. When the support sleeve 1 rotates in the dose return direction, the transmission sleeve 6 moves axially forward to separate the fixed gear 4 from the energy storage sleeve 7, and the energy storage sleeve 7 rotates reversely under the action of the torsional spring 8 to return the dose. Specifically, the front end of the energy storage sleeve 7 is provided with a first one-way tooth 72, and the rear end of the fixed gear 4 is provided with a second one-way tooth 41 matched with the first one-way tooth 72. When the first one-way tooth 72 and the second one-way tooth 41 are engaged, the energy storage sleeve 7 can only rotate in one direction to adjust the dose. When it is necessary to return, the fixed gear 4 is pushed away by the transmission sleeve 6, and the energy storage sleeve 7 can rotate to adjust the dose. The outside of the fixed gear 4 is provided with a vertical tooth 42 which can be engaged with the housing to stop. When the injection is performed, the vertical tooth 42 is disengaged from the housing, and at this time the first one-way tooth 72 and the second one-way tooth 41 are engaged, so that the fixed gear 4 can rotate with the energy storage sleeve 7.

[0051] The transmission sleeve 6 is located in the fixed gear 4 and the energy storage sleeve 7, and the two ends thereof are in contact with the inside of the fixed gear 4 and the energy storage sleeve 7 respectively. The rear end of the transmission sleeve 6 is provided with a first rib 61, one side of the first rib 61 is a first straight face 612, and the other side is a first inclined face 611. The front end of the energy storage sleeve 7 is internally provided with a first groove 73 matched with the first rib 61. The matching surface of the first groove 73 and the first straight face 612 is a second straight face 732, and the matching surface of the first groove 73 and the first inclined face 611 is a second inclined face 731. When the dose is set, the first straight face 612 and the second straight face 732 are matched to make the energy storage sleeve 7 rotate in linkage with the transmission sleeve 6. When the dose is returned, the first inclined face 611 and the second inclined face 731 are displaced, the transmission sleeve 6 moves axially to make the fixed gear 4 separate from the energy storage sleeve 7. The end of the first groove 73 is a second rib 71, and the corresponding position of the support sleeve 1 is provided with a third rib 13 which can axially limit the second rib 71, so that the support sleeve 1 can drive the energy storage sleeve 7 to move axially.

[0052] The front end of the support sleeve 1 is provided with a first vertical groove 12, and the inside of the transmission sleeve 6 is provided with a first vertical rib 62 which can be embedded in the first vertical groove 12. The first vertical rib 62 and the first vertical groove 12 are matched to make the support sleeve 1 rotate synchronously with the transmission sleeve 6. Of course, the transmission sleeve 6 can slide axially relative to the support sleeve 1.

[0053] When the dose is set, the dose setting knob 2 is rotated, the second vertical rib 21 engages the third vertical rib 11, the support sleeve 1 is rotated, the support sleeve 1 drives the transmission sleeve 6 to rotate, the transmission sleeve 6 drives the energy storage sleeve 7 to rotate under the cooperation of the first straight surface 612 and the second straight surface 732, and the torsional spring 8 is energized.

[0054] When the dose is dialed back, the dose setting knob 2 is reversely rotated, the support sleeve 1 is driven to rotate, the transmission sleeve 6 is driven to rotate and axially displaced under the cooperation of the first inclined surface 611 and the second inclined surface 731, the fixed gear 4 is pushed away, the energy storage sleeve 7 and the one-way tooth of the fixed gear 4 are disengaged, the energy storage sleeve 7 is reversely rotated under the drive of the torsional spring 8, and the dose is dialed back.

[0055] When the injection is performed, the button 3 is pressed, the support sleeve 1 is downwardly displaced, the spring 5 is compressed, the third vertical rib 11 of the support sleeve 1 is disengaged from the second vertical rib 21 of the dose setting knob 2, the vertical tooth 42 on the fixed gear 4 and the shell are disengaged, the energy storage sleeve 7 drives the fixed gear 4 to drive the reverse limiting 10 under the action of the torsional spring 8, the screw rod 9 is rotated and moved forward under the limitation of the forward thread.

[0056] The present application can not only set the dose, but also dial back the dose, so that the dose can be better adjusted. The present application can store energy in the torsional spring while setting the dose.

Claims

1. A dose dialing mechanism of an energy storage injection pen, comprising a support sleeve (1) capable of rotating for dose setting, dose dialing, and triggering an injection action; an energy storage sleeve (7) mounted on the support sleeve (1) and linked with the support sleeve (1) to realize dose adjustment and perform an injection action according to a dose; a fixed gear (4) mounted at a front end of the energy storage sleeve (7) and capable of meshing with the energy storage sleeve (7) to limit the rotation direction of the energy storage sleeve (7), when the fixed gear (4) meshes with the energy storage sleeve (7), the energy storage sleeve (7) can rotate relative to the fixed gear (4) for dose setting or the energy storage sleeve (7) can drive the fixed gear (4) to rotate synchronously, when the fixed gear (4) is disengaged from the energy storage sleeve (7), the energy storage sleeve (7) can rotate relative to the fixed gear (4) for dose dialing; a transmission sleeve (6) for connecting the support sleeve (1) and the energy storage sleeve (7) to realize linkage and push the fixed gear (4) away to disengage the fixed gear (4) from the energy storage sleeve (7); the transmission sleeve (6) has a first inclined surface (611) and the energy storage sleeve (7) has a second inclined surface (731), when dose dialing, the first inclined surface (611) and the second inclined surface (731) are displaced, the transmission sleeve (6) moves axially to disengage the fixed gear (4) from the energy storage sleeve (7).

2. A dose dialling mechanism for an energy storing injection pen according to claim 1, characterized in that: a dose setting knob (2) is mounted on the support sleeve (1), when the dose setting knob (2) rotates, it can drive the support sleeve (1) to set a dose or dial a dose, and the support sleeve (1) can move axially relative to the dose setting knob (2) to trigger an injection action.

3. A dose dialling mechanism for an energy storing injection pen according to claim 1, characterized in that: a button (3) is mounted at a rear end of the support sleeve (1) to press and drive the support sleeve (1) to move axially.

4. A dose dialling mechanism for an energy storing injection pen according to claim 1, characterized in that: a torsional spring (8) is arranged in the energy storage sleeve (7) to drive the energy storage sleeve (7) to rotate and perform an injection action or dial a dose.

5. A dose dialling mechanism for an energy storing injection pen according to claim 4, characterized in that: one end of the torsional spring (8) is connected with a notch (74) on an inner wall of the energy storage sleeve (7) and the other end is connected with a housing of the energy storage injection pen.

6. A dose dial mechanism for an energy-based injection pen according to claim 1, characterized in that: a reverse limiting part (10) capable of rotating synchronously with the fixed gear (4) is mounted at a front end of the fixed gear (4), a spring (5) is arranged between the reverse limiting part (10) and the fixed gear (4) to support axially and enable the fixed gear (4) to mesh with the energy storage sleeve (7).

7. A dose dial mechanism for an energy-based injection pen according to claim 1, characterized in that: the fixed gear (4) can mesh with the housing of the energy storage injection pen to stop when adjusting a dose.

8. A dose dial mechanism for an energy-based injection pen according to claim 1, characterized in that: the fixed gear (4) is connected with the energy storage sleeve (7) through one-way teeth.

9. A dose dial mechanism for an energy-based injection pen according to claim 1, characterized in that: The rear end of the transmission sleeve (6) is provided with a first rib position (61), one side of the first rib position (61) is a first straight face (612), and the other side is a first inclined face (611), the front end of the energy storage sleeve (7) is internally provided with a first groove (73) matched with the first rib position (61), the matching face of the first groove (73) and the first straight face (612) is a second straight face (732), the matching face of the first groove (73) and the first inclined face (611) is a second inclined face (731), and during dose setting, the first straight face (612) and the second straight face (732) are matched to link the rotation of the energy storage sleeve (7) and the transmission sleeve (6).

10. A dose dialling mechanism for an energy storing injection pen according to claim 9, characterized in that: The front end of the support sleeve (1) is provided with a first vertical groove (12), and the inside of the transmission sleeve (6) is provided with a first vertical rib position (62) capable of being embedded in the first vertical groove (12).

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