Dose dial back mechanism of energy storage injection pen

Abstract

A dose dial back mechanism of an energy storage injection pen, comprising: a support sleeve (1), which can rotate for dose setting and dose dial back, and can trigger an injection action; an energy storage sleeve (7), which is mounted outside the support sleeve (1) and is linked with the support sleeve (1) to achieve dose adjustment and execute an injection action according to the dose; a fixing 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) after being engaged with the energy storage sleeve (7), such that when the fixing gear (4) is engaged with the energy storage sleeve (7), the energy storage sleeve (7) can rotate relative to the fixing gear (4) for dose setting or the energy storage sleeve (7) can drive the fixing gear (4) to rotate synchronously, and when the fixing gear (4) is disengaged from the energy storage sleeve (7), the energy storage sleeve (7) can rotate relative to the fixing gear (4) for dose dial back; and a transmission sleeve (6), which is configured to connect the support sleeve (1) and the energy storage sleeve (7) to achieve linkage, and can push away the fixing gear (4) to enable the fixing gear (4) to disengage from the energy storage sleeve (7). The dose dial back mechanism can achieve dose setting and dose dial back, and therefore can better adjust the dose.

Description

A dose recall mechanism for an energy storage injection pen Technical Field

[0001] The invention belongs to the technical field of injection, and in particular relates to a dosage recall mechanism of an energy storage injection pen. Background Art

[0002] CN 108578834 B discloses an injection device having a housing in which a receptacle for a container containing an injection liquid is constructed. The injection device has an operating element for adjusting the injection dose and a dosing unit that moves 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, the dose is not adjusted, and in each injection position, the dose of the set injection liquid is adjusted. The injection device has a latching device that acts between two components that move 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 to at least one intermediate position in which the dose of the injection liquid is not adjusted. A spring acts between the dosing unit and the housing, and when the operating element is not operated, the spring returns the dosing unit from the intermediate position to the injection position or to the zero position.

[0003] The return of this structure only returns the metering unit to the injection position or to the zero position, and cannot realize the return of the injection dose, that is, cannot realize the dose correction. Summary of the Invention

[0004] In view of the problems existing in the above background technology, the purpose of the present invention is to provide a dose call-back mechanism for an energy storage injection pen that can achieve dose correction.

[0005] The technical solution adopted in the present invention is:

[0006] A dose recall mechanism for an energy storage injection pen, comprising

[0007] A support sleeve that can be rotated to set and recall the dose and trigger the injection action;

[0008] An energy storage sleeve is installed outside the support sleeve and works in conjunction with the support sleeve to adjust the dosage and perform the injection action according to the dosage;

[0009] A fixed gear, which is mounted on the front end of the energy storage sleeve and can be engaged with the energy storage sleeve to limit the direction 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 the 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 recall the dose.

[0010] The transfer sleeve is used to connect the support sleeve and the energy storage sleeve to achieve linkage, and can push the fixed gear away to separate the fixed gear from the energy storage sleeve.

[0011] Furthermore, a dose setting knob is mounted on the support sleeve. When the dose setting knob is rotated, the support sleeve can be driven to set and recall the dose. The support sleeve can move axially relative to the dose setting knob to trigger the injection action.

[0012] Furthermore, a button for driving the support sleeve to move axially is installed at the rear end of the support sleeve.

[0013] Furthermore, the energy storage sleeve is provided with a torsion spring which can drive the energy storage sleeve to rotate to perform an injection action or adjust the dosage after accumulating driving force.

[0014] Furthermore, one end of the torsion spring is connected to the notch on the inner wall of the energy storage sleeve, and the other end thereof is connected to the outer shell of the energy storage injection pen.

[0015] Furthermore, a reverse limiter capable of rotating synchronously with the fixed gear is installed at the front end of the fixed gear, and a spring for axially supporting the fixed gear to engage with the energy storage sleeve is provided between the reverse limiter and the fixed gear.

[0016] Furthermore, the fixed gear can be engaged with the housing of the energy storage injection pen and stopped when the dose is adjusted.

[0017] Furthermore, the fixed gear is connected to the energy storage sleeve through one-way tooth meshing.

[0018] Furthermore, a first rib is provided at the rear end of the transmission sleeve, one side of the first rib is a first straight surface, and the other side is a first inclined surface. A first groove is provided inside the front end of the energy storage sleeve to cooperate with the first rib, and the matching surface between the first groove and the first straight surface is a second straight surface, and the matching surface between the first groove and the first inclined surface is a second inclined surface. When the dose is set, the first straight surface and the second straight surface cooperate to make the energy storage sleeve and the transmission sleeve rotate in conjunction. When the dose is called back, the first inclined surface and the second inclined surface are displaced, and the transmission sleeve moves axially to separate the fixed gear from the energy storage sleeve.

[0019] Furthermore, a first vertical groove is provided at the front end of the support sleeve, and a first vertical rib capable of being embedded in the first vertical groove is provided inside the transmission sleeve.

[0020] Compared with the prior art, the present invention has the following significant advantages: it can not only realize dose setting, but also realize dose callback, thereby better adjusting the dose. At the same time, the torsion spring can store energy while the dose is set. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] FIG1 is a schematic diagram of the explosion structure of the present invention.

[0022] FIG2 is a schematic structural diagram of the present invention.

[0023] FIG3 is a schematic structural diagram of FIG2 of the present invention with the button and the dose setting knob removed.

[0024] FIG4 is a schematic cross-sectional view of the structure of FIG2 of the present invention with the dose setting knob removed.

[0025] FIG5 is a schematic structural diagram of FIG3 of the present invention after removing the energy storage sleeve.

[0026] FIG6 is a schematic cross-sectional view of a portion of the structure of the present invention that cooperates with the screw.

[0027] FIG7 is a schematic diagram of the cooperation relationship between the support sleeve and the energy storage sleeve of the present invention.

[0028] FIG8 is a schematic diagram of the cooperation relationship between the energy storage sleeve and the torsion spring of the present invention.

[0029] FIG9 is a schematic structural diagram of the support sleeve of the present invention.

[0030] FIG. 10 is a schematic cross-sectional view of the dose setting knob of the present invention.

[0031] FIG11 is a schematic structural diagram of a fixed gear of the present invention.

[0032] FIG12 is a schematic structural diagram of the transfer sleeve of the present invention.

[0033] FIG13 is a schematic structural diagram of the energy storage sleeve of the present invention.

[0034] FIG14 is a schematic structural diagram of the screw of the present invention.

[0035] FIG15 is a schematic structural diagram of the reverse limiter of the present invention.

[0036] Among them, 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 plane, 612. first straight plane, 62. first vertical rib position; 7. energy storage sleeve, 71. second rib position, 72. first one-way tooth, 73. first groove, 731. second inclined plane, 732. second straight plane; 8. torsion spring; 9. screw; 10. reversal limit, 101. cantilever, 102. fourth vertical rib position. DETAILED DESCRIPTION

[0037] The present invention will be further described below with reference to specific embodiments, but the present invention is not limited to these specific embodiments. Those skilled in the art should recognize that the present invention covers all possible alternatives, improvements and equivalents within the scope of the claims.

[0038] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention 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 cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more, unless otherwise clearly defined.

[0039] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0040] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0041] 1-15, this embodiment provides a dose recall mechanism for an energy storage injection pen, including

[0042] Support sleeve 1, which can be rotated to set and recall the dose, and trigger the injection action;

[0043] The energy storage sleeve 7 is installed outside the support sleeve 1 and works in conjunction with the support sleeve 1 to adjust the dosage and perform the injection action according to the dosage;

[0044] The fixed gear 4 is mounted on the front end of the energy storage sleeve 7 and can be engaged with the energy storage sleeve 7 to limit the 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 to set the dose 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 to recall the dose.

[0045] The transmission sleeve 6 is used to connect the support sleeve 1 and the energy storage sleeve 7 to achieve linkage, and can push the fixed gear 4 away to disengage the fixed gear 4 from the energy storage sleeve 7.

[0046] The support sleeve 1 of this embodiment is mounted with a dose setting knob 2. Rotating the dose setting knob 2 drives the support sleeve 1 to set and recall the dose. The support sleeve 1 can also move axially relative to the dose setting knob 2 to trigger an injection. A second vertical rib 21 is provided within the dose setting knob 2, and a corresponding third vertical rib 11 is provided on the support sleeve 1 to mate with the second vertical rib 21. When the second vertical rib 21 engages with the third vertical rib 11, rotation of the dose setting knob 2 drives rotation of the support sleeve 1. The support sleeve 1 can then rotate after axially moving relative to the dose setting knob 2, leaving the engaged position.

[0047] The rear end of the support sleeve 1 in this embodiment is mounted with a button 3, which is used to drive the support sleeve 1 axially when pressed. Specifically, the button 3 comprises an inner sleeve, which is positioned within the rear end of the support sleeve 5 and axially secured to the inner wall ribs 14 of the support sleeve 1 via outer wall ribs 31, preventing the button 3 from falling out. Pressing the button 3 causes the support sleeve 1 to move axially, thereby driving the energy storage sleeve 7 forward.

[0048] The energy storage sleeve 7 of this embodiment is equipped with a torsion spring 8 that accumulates driving force and drives the energy storage sleeve 7 to rotate to perform injection or dose adjustment. One end of the torsion spring 8 is connected to a notch 75 on the inner wall of the energy storage sleeve 7, and the other end is connected to the outer casing of the energy storage injection pen (not shown). The end connected to the outer casing remains stationary. When the energy storage sleeve 7 rotates, the torsion spring 8 rotates with it to accumulate force.

[0049] The front end of the fixed gear 4 in this embodiment is equipped with a reverse limiter 10 that rotates synchronously with it. A spring 5 is provided between the reverse limiter 10 and the fixed gear 4 to axially support the fixed gear 4 and enable engagement 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 limiter 10 is provided with a fourth vertical rib 102. The second vertical groove 43 cooperates with the fourth vertical rib 102, allowing the reverse limiter 10 to rotate synchronously with the fixed gear 4. Of course, the fixed gear 4 can also move axially relative to the reverse limiter 10. During dose adjustment, the spring 5 supports the fixed gear 4, ensuring that the vertical teeth 42 remain attached to the housing. Simultaneously, the first one-way teeth 72 and the second one-way teeth 41 are also pressed together by the spring 5. The reverse limiter 10 can drive the screw 9 to rotate synchronously. The reverse limiter 10 is provided with a cantilever 101 that cooperates with the housing to ensure that the reverse limiter 10 can only rotate in one direction.

[0050] The fixed gear 4 described in this embodiment can be meshed with the housing of the energy storage injection pen to stop the pen during dose adjustment. The fixed gear 4 is meshed with the energy storage sleeve 7 via one-way teeth. When the support sleeve 1 rotates in the dose setting direction, the transmission sleeve 6 rotates, driving the energy storage sleeve 7, which then rotates the torsion spring 8 to store energy. At this point, the fixed gear 4 engages with the housing to stop the pen. When the support sleeve 1 rotates in the dose adjustment direction, the transmission sleeve 6 moves axially forward, separating the fixed gear 4 from the energy storage sleeve 7. The energy storage sleeve 7 then rotates in the opposite direction under the action of the torsion spring 8 to adjust 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 that mates with the first one-way tooth 72. When the first one-way tooth 72 meshes with the second one-way tooth 41, the energy storage sleeve 7 can only rotate in one direction for dose adjustment. When dose adjustment is required, the transmission sleeve 6 pushes the fixed gear 4 away, allowing the energy storage sleeve 7 to rotate back to adjust the dose. The outside of the fixed gear 4 is provided with a vertical tooth 42 that can engage with the housing. When injection is performed, the vertical tooth 42 is disengaged from the housing, and the first one-way tooth 72 is engaged with the second one-way tooth 41, so that the fixed gear 4 can rotate with the energy storage sleeve 7.

[0051] The transmission sleeve 6 of this embodiment is located within the fixed gear 4 and the energy storage sleeve 7, with its ends respectively contacting the interiors of the fixed gear 4 and the energy storage sleeve 7. 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 surface 612, and the other side is a first inclined surface 611. The front end of the energy storage sleeve 7 is provided with a first groove 73 that mates with the first rib 61. The mating surface between the first groove 73 and the first straight surface 612 is a second straight surface 732, and the mating surface between the first groove 73 and the first inclined surface 611 is a second inclined surface 731. When setting a dose, the first straight surface 612 and the second straight surface 732 cooperate to cause the energy storage sleeve 7 and the transmission sleeve 6 to rotate in tandem. When resetting the dose, the first inclined surface 611 and the second inclined surface 731 are displaced, causing the transmission sleeve 6 to move axially, separating the fixed gear 4 from the energy storage sleeve 7. The end of the first groove 73 is a second rib 71 , and a third rib 13 is provided at the corresponding position of the support sleeve 1 . The third rib 13 can be axially limited with the second rib 71 , so that the support sleeve 1 can drive the energy storage sleeve 7 to move axially.

[0052] In this embodiment, the support sleeve 1 has a first vertical groove 12 at its front end, and the transfer sleeve 6 has a first vertical rib 62 inside that fits into the first vertical groove 12. The first vertical rib 62 cooperates with the first vertical groove 12 to allow the support sleeve 1 to rotate synchronously with the transfer sleeve 6, while the transfer sleeve 6 can slide axially relative to the support sleeve 1.

[0053] When setting the dose of the present invention, the dose setting knob 2 is rotated, and the second vertical rib 21 engages with the third vertical rib 11, driving the support sleeve 1 to rotate, and 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 torsion spring 8 stores force.

[0054] When the dose is called back, the dose setting knob 2 is rotated in the opposite direction to drive the support sleeve 1. The support sleeve 1 drives the transmission sleeve 6 to rotate to produce axial displacement under the cooperation of the first inclined surface 611 and the second inclined surface 731, pushing the fixed gear 4 away, so that the one-way teeth of the energy storage sleeve 7 and the fixed gear 4 can be disengaged. Driven by the torsion spring 8, the energy storage sleeve 7 produces reverse rotation, so that the dose can be withdrawn.

[0055] When performing an injection, the button 3 is pressed, causing the support sleeve 1 to move downward and compressing the spring 5; the third vertical rib 11 of the support sleeve 1 is disengaged from the second vertical rib 21 of the dose setting knob 2, and at the same time, the vertical teeth 42 on the fixed gear 4 are disengaged from the housing; under the action of the torsion spring 8, the energy storage sleeve 7 drives the fixed gear 4 to drive the reversal limit 10, driving the screw 9 to rotate, and the screw 9 moves forward under the limitation of the forward thread.

[0056] The present invention can not only realize dose setting, but also realize dose callback, thereby being able to better adjust the dose. The present invention can store energy of the torsion spring while setting the dose.

Claims

1. A dose recall mechanism for an energy storage injection pen, comprising A support sleeve (1) which can be rotated to set and recall the dose and trigger the injection action; An energy storage sleeve (7) is mounted outside the support sleeve (1) and is linked with the support sleeve (1) to achieve dosage adjustment and perform injection according to the dosage; A fixed gear (4) is mounted on the front end of the energy storage sleeve (7) and can be engaged with the energy storage sleeve (7) to limit the 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) to set the dose 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) to call back the dose. The transmission sleeve (6) is used to connect the support sleeve (1) and the energy storage sleeve (7) to realize linkage, and can push the fixed gear (4) to make the fixed gear (4) disengage from the energy storage sleeve (7).

2. The dose recall mechanism of the energy storage 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) is rotated, it can drive the support sleeve (1) to set and recall the dose. The support sleeve (1) can move axially relative to the dose setting knob (2) to trigger an injection action.

3. The dose recall mechanism of the energy storage injection pen according to claim 1, characterized in that: A button (3) for driving the support sleeve (1) to move axially is installed at the rear end of the support sleeve (1).

4. The dose recall mechanism of the energy storage injection pen according to claim 1, characterized in that: The energy storage sleeve (7) is provided with a torsion spring (8) which can drive the energy storage sleeve (7) to rotate and perform an injection action or a dose recall after accumulating driving force.

5. The dose recall mechanism of the energy storage injection pen according to claim 4, characterized in that: One end of the torsion spring (8) is connected to the notch (74) on the inner wall of the energy storage sleeve (7), and the other end is connected to the outer shell of the energy storage injection pen.

6. The dose recall mechanism of the energy storage injection pen according to claim 1, characterized in that: A reverse limiter (10) capable of rotating synchronously with the fixed gear (4) is installed at the front end of the fixed gear (4), and a spring (5) for axially supporting the fixed gear (4) so ​​as to engage with the energy storage sleeve (7) is provided between the reverse limiter (10) and the fixed gear (4).

7. The dose recall mechanism of the energy storage injection pen according to claim 1, characterized in that: The fixed gear (4) can be engaged with the housing of the energy storage injection pen and stopped when the dose is adjusted.

8. The dose recall mechanism of the energy storage injection pen according to claim 1, characterized in that: The fixed gear (4) is connected to the energy storage sleeve (7) through one-way tooth meshing.

9. The dose recall mechanism of the energy storage injection pen according to claim 1, characterized in that: 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 surface (612), and the other side is a first inclined surface (611). The front end of the energy storage sleeve (7) is provided with a first groove (73) that matches the first rib (61). The matching surface of the first groove (73) and the first straight surface (612) is a second straight surface (732), and the matching surface of the first groove (73) and the first inclined surface (611) is a second inclined surface (731). When the dose is set, the first straight surface (612) and the second straight surface (732) match to make the energy storage sleeve (7) and the transmission sleeve (6) rotate in conjunction. When the dose is called back, the first inclined surface (611) and the second inclined surface (731) are displaced, and the transmission sleeve (6) moves axially to separate the fixed gear (4) from the energy storage sleeve (7).

10. The dose recall mechanism of the energy storage 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 interior of the transfer sleeve (6) is provided with a first vertical rib (62) capable of being embedded in the first vertical groove (12).

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