Energy storage injection pen

Abstract

An energy storage injection pen, comprising a housing, which is of a hollow structure; a threaded rod, which advances spirally to push a piston in a cartridge to inject a medicine; an energy storage driving mechanism, which is mounted between the housing and the threaded rod and configured to drive the threaded rod to advance; a dose adjusting mechanism, which can perform dose setting, dose dial back, and final dose locking, triggers the energy storage driving mechanism to store energy when setting a dose, and can trigger actuation of the energy storage driving mechanism to drive the threaded rod when implementing an injection; a dose setting knob, which is connected to the rear end of the housing and can rotate to drive the dose adjusting mechanism to perform the dose setting or dose dial back; and a button, which is mounted on the dose adjusting mechanism and configured to enable the dose adjusting mechanism to trigger the actuation of the energy storage driving mechanism to drive the threaded rod after being pressed. The present invention can achieve the dose setting, dose dial back, and final dose locking, thereby better adjusting the dose and preventing sub-dose injection.

Description

Energy storage injection pen Technical Field

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

[0002] Autoinjectors, or pen-type injectors, have been commercially available for many years. One of the earliest autoinjectors, developed during wartime, was activated by pressing the syringe against a body part. The primary focus was injecting the medication as quickly as possible, without much attention paid to patient or handling safety. In recent years, some medications have become available that must be injected by the patient themselves. Consequently, depending on the intended use and the type of medication, injection devices with varying degrees of automation have been developed to facilitate reliable and safe medication administration by patients, and even by trained personnel such as doctors and nurses.

[0003] Existing syringes, such as CN106999664B, disclose a metered-dose injection pen comprising: a housing; a metering element movable relative to the housing between a start position and a set position; a transmission system coupled to the metering element and operable to initiate or execute a dispensing operation; and a subdose prevention system, which prevents or blocks the transmission system's dispensing operation when the metering element has not reached the set position, and allows or unlocks the transmission system's dispensing operation when the metering element reaches the set position or thereafter. When preventing or blocking the transmission system's dispensing operation, the subdose prevention system is operable to block rotational movement of the transmission element of the transmission system in a circumferential direction corresponding to a dispensing direction or a dialing direction. Specifically, this is achieved via a locking ring, which allows the rotating sleeve to be dialed in or rotated and prevents the rotating sleeve from being dialed in or rotated downward when the preset dose has not been fully dialed in.

[0004] However, a drawback of the subdose prevention system in the aforementioned application is that if the dosing element does not reach the designated position, the operator's intention to abandon the injection process cannot be realized. Therefore, there is a need for a dosing injection pen that can both retract when the designated position is not reached and prevent subdose during the injection process. Summary of the Invention

[0005] In view of the problems existing in the above background technology, the purpose of the present invention is to provide an energy storage injection pen with dose correction and dose locking to prevent sub-dose injection.

[0006] The technical solution adopted in the present invention is:

[0007] An energy storage injection pen, comprising

[0008] a housing, which is a hollow structure;

[0009] A screw, which spirally advances to push the piston in the cartridge to inject the drug;

[0010] An energy storage drive mechanism is installed between the housing and the screw to drive the screw forward;

[0011] The dose adjustment mechanism can perform dose setting, dose recall and final dose locking, and triggers the energy storage drive mechanism to store energy when the dose is set, and triggers the energy storage drive mechanism to drive the screw when the injection is performed;

[0012] A dose indicator is installed between the energy storage drive mechanism and the housing for dose indication;

[0013] The dose setting knob is connected to the rear end of the housing and can be rotated to drive the dose adjustment mechanism to set or recall the dose;

[0014] The button is mounted on the dose adjustment mechanism and is used to enable the dose adjustment mechanism to trigger the energy storage drive mechanism to drive the screw after being pressed.

[0015] Furthermore, the dose adjustment mechanism includes a support sleeve, the button is mounted on the rear end of the support sleeve, the dose setting knob is rotatably connected to the support sleeve and can slide axially relative to the support sleeve, and the front end of the support sleeve is connected to the energy storage drive mechanism through a transfer sleeve.

[0016] Furthermore, the support sleeve is internally spirally connected to a limiting member, and the final dose is locked when the top end surface of the limiting member contacts the rear end portion of the internal thread of the support sleeve.

[0017] Furthermore, the energy storage drive mechanism includes an energy storage sleeve, which is arranged outside the supporting sleeve and is linked through the transmission sleeve. A torsion spring for energy storage is arranged between the energy storage sleeve and the supporting sleeve. One end of the torsion spring is connected to the energy storage sleeve, and the other end is connected to the outer shell.

[0018] Furthermore, a fixed gear is installed at the front end of the energy storage sleeve, which can limit its direction of rotation after engaging with it. The fixed gear can be stopped after engaging with the shell and move axially relative to the shell. When the support sleeve rotates in the dose setting direction, the transmission sleeve rotates to drive the energy storage sleeve to rotate, and then the torsion spring rotates to store energy. At this time, the fixed gear is engaged with the shell and stopped. When the support sleeve rotates in the dose callback direction, the transmission sleeve moves axially forward to separate the fixed gear from the energy storage sleeve. The energy storage sleeve rotates in the opposite direction under the action of the torsion spring to call back the dose.

[0019] Furthermore, a reversal limiter is installed at the front end of the fixed gear and can rotate synchronously with it. A spring is provided between the reversal limiter and the fixed gear to axially support the fixed gear so that the fixed gear and the energy storage sleeve are engaged. The screw is inserted into the reversal limiter and is driven to rotate by the reversal limiter. When the injection is performed, the support sleeve moves downward and disengages from the dose setting knob, and the energy storage sleeve moves downward synchronously to disengage the fixed gear from the outer shell, so that the energy storage sleeve, the fixed gear and the reversal limiter rotate synchronously driven by the torsion spring to drive the screw to rotate.

[0020] Furthermore, the reversal limit is fixed on the advancing thread, the advancing thread is fixedly installed in the shell, the front end of the screw passes through the advancing thread and is connected to a push plate, and the thread between the screw and the advancing thread limits forward movement.

[0021] Furthermore, a cantilever is provided on the reversal limiter, which can cooperate with the directional teeth on the housing so that the reversal limiter can only rotate in one direction.

[0022] 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.

[0023] Furthermore, it also includes a refill frame, in which a cartridge bottle is installed and connected to the front end of the shell, and the front end is used to install an injection needle; the refill frame is buckled with a pen cap.

[0024] Compared with the prior art, the present invention has the following significant advantages:

[0025] 1. The present invention can not only realize dose setting, but also realize dose callback and last dose locking, so as to better adjust the dose and prevent subdose injection.

[0026] 2. The present invention can store energy in the energy storage drive mechanism while setting the dosage. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] FIG1 is a schematic diagram of the explosion structure of the present invention.

[0028] FIG2 is a schematic cross-sectional view of the present invention after removing the refill holder, cartridge bottle, and pen cap.

[0029] FIG3 is a schematic cross-sectional view of the structure of FIG2 of the present invention after removing the screw.

[0030] FIG4 is a schematic cross-sectional view of the structure of FIG3 of the present invention with the outer shell and the advancing thread removed.

[0031] FIG5 is a cross-sectional view of the structure of FIG3 of the present invention with the housing and the dose setting knob removed.

[0032] FIG6 is a cross-sectional structural diagram of FIG4 of the present invention without the reverse limiter, spring, and dose indicator.

[0033] FIG7 is a schematic structural diagram of the dosage adjustment mechanism and the energy storage drive mechanism of the present invention.

[0034] FIG8 is a schematic diagram of the cooperation relationship between the support sleeve and the energy storage sleeve of the present invention.

[0035] FIG9 is a schematic diagram of the cooperation relationship between the energy storage sleeve and the torsion spring of the present invention.

[0036] FIG10 is a schematic cross-sectional structural diagram of the housing of the present invention.

[0037] FIG11 is a schematic cross-sectional view of the dose setting knob of the present invention.

[0038] FIG12 is a schematic structural diagram of a dosage indicator of the present invention.

[0039] FIG13 is a schematic structural diagram of the support sleeve of the present invention.

[0040] FIG14 is a schematic structural diagram of the transfer sleeve of the present invention.

[0041] FIG15 is a schematic structural diagram of the energy storage sleeve of the present invention.

[0042] FIG. 16 is a schematic structural diagram of a position-limiting member of the present invention.

[0043] FIG17 is a schematic structural diagram of a fixed gear of the present invention.

[0044] FIG18 is a schematic structural diagram of the screw of the present invention.

[0045] FIG19 is a schematic structural diagram of the reverse limiter of the present invention.

[0046] FIG20 is a schematic diagram of the top view of the reverse limit structure of the present invention.

[0047] Among them, 1. Shell, 111. Circular rib position, 112. Second annular rib position, 113. Second internal thread, 114. Second vertical tooth, 115. Orientation tooth; 2. Dose setting knob, 21. First vertical rib position, 22. First annular rib position; 3. Button, 31. Outer wall rib position; 4. Dose indicator, 41. Fourth vertical groove, 42. Second external thread; 5. Support sleeve, 51. Second vertical rib position, 52. First vertical groove, 53. Third rib position, 54. First internal thread, 55. Rear end of internal thread, 56. Inner wall rib position; 6. Transfer sleeve, 61. First rib position, 611. First inclined plane, 612. First straight plane, 62. Third vertical rib position; 7. Energy storage sleeve Cylinder, 71, sixth vertical rib position, 72, first one-way tooth, 73, first groove, 731, second inclined surface, 732, second straight surface, 74, second rib position, 75, notch; 8, torsion spring; 9, limiter, 91, first external thread, 92, second vertical groove, 93, top end face; 10, fixed gear, 101, second one-way tooth, 102, first vertical tooth, 103, third vertical groove, 104, fourth vertical rib position; 11, spring; 12, screw; 13, reverse limiter, 131, cantilever, 132, fifth vertical rib position, 133, flat hole; 14, forward thread, 141, step; 15, push plate; 16, cartridge bottle; 17, refill holder; 18, pen cap. DETAILED DESCRIPTION

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 1-20, this embodiment provides an energy storage injection pen, including

[0053] The housing 1 is a hollow structure;

[0054] The refill holder 17 has a cartridge 16 mounted therein and is connected to the front end of the housing 1, and the front end is used to mount an injection needle;

[0055] A pen cap 18, which is fastened to the refill holder 17;

[0056] The screw 12 spirally advances to push the piston in the cartridge 16 to inject the drug;

[0057] An energy storage drive mechanism is installed between the housing 1 and the screw 12 to drive the screw 12 forward;

[0058] The dose adjustment mechanism can perform dose setting, dose recall and final dose locking, and triggers the energy storage drive mechanism to store energy when the dose is set, and triggers the energy storage drive mechanism to drive the screw 12 when the injection is performed;

[0059] A dose indicator 4 is installed between the energy storage drive mechanism and the housing 1 and is used for dose indication;

[0060] The dose setting knob 2 is connected to the rear end of the housing 1 and can rotate to drive the dose adjustment mechanism to set or recall the dose;

[0061] The button 3 is mounted on the dose adjustment mechanism and is used to enable the dose adjustment mechanism to trigger the energy storage drive mechanism to drive the screw 12 after being pressed.

[0062] The dose adjustment mechanism of this embodiment includes a support sleeve 5, and the button 3 is mounted on the rear end of the support sleeve 5. Specifically, the button 3 has an inner sleeve, which is arranged inside the rear end of the support sleeve 5 and axially fixedly engaged with the inner wall ribs 56 of the support sleeve 5 via outer wall ribs 31, thereby preventing the button 3 from falling off. When the button 3 is pressed, the support sleeve 5 can move axially, thereby driving the energy storage drive mechanism forward.

[0063] The dose setting knob 2 is rotatably connected to the support sleeve 5 and can slide axially relative to it. Specifically, the dose setting knob 2 is internally provided with a first vertical rib 21, and the support sleeve 5 is correspondingly provided with a second vertical rib 51 that cooperates with the first vertical rib 21. When the first vertical rib 21 and the second vertical rib 51 engage, rotation of the dose setting knob 2 drives the support sleeve 5. The support sleeve 5 can move axially relative to the dose setting knob 2 out of the engaged position and then rotate. The dose setting knob 2 is internally provided with a first annular rib 22, and the housing 1 is correspondingly provided with a second annular rib 112 that is rotatably connected to and cooperates with the first annular rib 22.

[0064] The front end of the support sleeve 5 is connected to the energy storage drive mechanism via the transfer sleeve 6. Specifically, a first vertical slot 52 is defined at the front end of the support sleeve 5, and a third vertical rib 62 is defined within the transfer sleeve 6, which fits into the first vertical slot 52. The third vertical rib 62 cooperates with the first vertical slot 52 to enable the support sleeve 5 and the transfer sleeve 6 to rotate synchronously, while the transfer sleeve 6 can slide axially relative to the support sleeve 5.

[0065] The support sleeve 5 is internally threadedly connected to a limiter 9. The final dose is locked when the top end surface 93 of the limiter 9 contacts the rear end portion 55 of the internal thread of the support sleeve 5. Specifically, the limiter 9 has a first external thread 91, and the support sleeve 5 has a first internal thread 54. When the dose is adjusted, the support sleeve 5 rotates, causing the limiter 9 to rise upward along the first internal thread 54. When the top end surface 93 of the limiter 9 contacts the rear end portion 55 of the internal thread, the injection pen cannot continue to set the dose. The limiter 9 has a second vertical groove 92. The fixed gear 10 has a fourth vertical rib 104 that fits into the second vertical groove 92. The fourth vertical rib 104 cooperates with the second vertical groove 92 to enable the support sleeve 5 to rotate synchronously with the limiter 9 during injection, thereby preventing the dose from being locked. Of course, the limiter 9 can slide axially relative to the fixed gear 10 during dose adjustment.

[0066] The energy storage drive mechanism described in this embodiment includes an energy storage sleeve 7, which is arranged outside the supporting sleeve 5 and is linked through the transmission sleeve 6. A torsion spring 8 for energy storage is provided between the energy storage sleeve 7 and the supporting sleeve 5. One end of the torsion spring 8 is connected to the notch 75 on the inner wall of the energy storage sleeve 7, and the other end is connected to the circular rib 111 in the outer shell 1.

[0067] The front end of the energy storage sleeve 7 is equipped with a fixed gear 10 that can be engaged with it to limit its direction of rotation. The fixed gear 10 can be stopped after engagement with the housing 1 and can move axially relative to the housing 1. When the support sleeve 5 rotates in the dose setting direction, the transmission sleeve 6 rotates, driving the energy storage sleeve 7 to rotate, and the torsion spring 8 rotates to store energy. At this time, the fixed gear 10 is engaged with the housing 1 and stopped. When the support sleeve 5 rotates in the dose adjustment direction, the transmission sleeve 6 moves axially forward, causing the fixed gear 10 to separate from the energy storage sleeve 7. The energy storage sleeve 7 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 10 is provided with a second one-way tooth 101 that cooperates with the first one-way tooth 72. When the first one-way tooth 72 and the second one-way tooth 101 are engaged, the energy storage sleeve 7 can only rotate in one direction to adjust the dose. When the dose adjustment is required, the fixed gear 10 is pushed away by the transmission sleeve 6, and the energy storage sleeve 7 can rotate back to adjust the dose. The fixed gear 10 is externally provided with a first vertical tooth 102, and the housing 1 is correspondingly provided with a second vertical tooth 114 that mates with the first vertical tooth 102. When adjusting the dose, the first vertical tooth 102 and the second vertical tooth 114 mesh, thereby stopping the fixed gear 10. When an injection is performed, the first vertical tooth 102 and the second vertical tooth 114 disengage, and the first one-way tooth 72 meshes with the second one-way tooth 101, allowing the fixed gear 10 to rotate with the energy storage sleeve 7.

[0068] The front end of the fixed gear 10 is mounted with a reverse limiter 13 that rotates synchronously therewith. A spring 11 is provided between the reverse limiter 13 and the fixed gear 10 to axially support the fixed gear 10 and enable it to engage with the energy storage sleeve 7. The screw 12 is inserted into the reverse limiter 13 and driven to rotate by the reverse limiter 13. During injection, the support sleeve 5 moves downward and disengages from the dose setting knob 2. The energy storage sleeve 7 also moves downward, disengaging the fixed gear 10 from the housing 1. Driven by the torsion spring 8, the energy storage sleeve 7, the fixed gear 10, and the reverse limiter 13 rotate synchronously, driving the screw 12 to rotate. Specifically, the fixed gear 10 is provided with a third vertical slot 103, and the inner wall of the reverse limiter 13 is provided with a fifth vertical rib 132. The third vertical slot 103 cooperates with the fifth vertical rib 132 to enable the reverse limiter 13 and the fixed gear 10 to rotate synchronously. Of course, the fixed gear 10 can also move axially relative to the reverse limiter 13. During dose adjustment, the spring 11 supports the fixed gear 10, ensuring that the first vertical tooth 102 and the second vertical tooth 114 do not separate. The first one-way tooth 72 and the second one-way tooth 101 are also pressed together by the spring 11. A flat hole 133 is provided within the reverse limiter 13, through which the screw 12 passes, allowing the screw 12 to rotate synchronously with the reverse limiter 13.

[0069] The reverse limiter 13 is fixed to a forward thread 14, which is fixedly mounted within the housing 1. The front end of the screw 12 passes through the forward thread 14 and is connected to a push plate 15. The threads between the screw 12 and the forward thread 14 limit forward movement. Specifically, the forward thread 14 is fixedly engaged with the housing 1, preventing rotation and sliding. A step 141 is provided on the forward thread 14, which cooperates with the lower flat surface of the reverse limiter 13 to provide support. The reverse limiter 13 is provided with a cantilever 131, which cooperates with the directional teeth 115 on the housing 1, ensuring that the reverse limiter 13 can rotate in only one direction.

[0070] The transmission sleeve 6 of this embodiment is located within the fixed gear 10 and the energy storage sleeve 7, with its ends respectively contacting the interiors of the fixed gear 10 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 10 from the energy storage sleeve 7. The end of the first groove 73 is a second rib 74 , and a third rib 53 is provided at the corresponding position of the support sleeve 5 . The third rib 53 can be axially limited with the second rib 74 , so that the support sleeve 5 can drive the energy storage sleeve 7 to move axially.

[0071] In this embodiment, the dose indicator 4 has a fourth vertical groove 41 inside and a second external thread 42 on the outside. The fourth vertical groove 41 is slidably connected to the sixth vertical rib 71 on the energy storage sleeve 7. When the energy storage sleeve 7 rotates, it can drive the dose indicator 4 to rotate on the second internal thread 113 of the shell.

[0072] When setting the dose of the present invention, the dose setting knob 2 is rotated, and the first vertical rib 21 engages with the second vertical rib 51, driving the support sleeve 5 to rotate, and the support sleeve 5 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.

[0073] When the dose is called back, the dose setting knob 2 is rotated in the opposite direction to drive the support sleeve 5. The support sleeve 5 drives the transmission sleeve 6 to rotate to generate axial displacement under the cooperation of the first inclined surface 611 and the second inclined surface 731, pushing away the fixed gear 10, so that the one-way teeth of the energy storage sleeve 7 and the fixed gear 10 can be disengaged. Driven by the torsion spring 8, the energy storage sleeve 7 generates reverse rotation, so that the dose can be withdrawn.

[0074] When performing an injection, the button 3 is pressed, causing the support sleeve 5 to move downward and compressing the spring 11; the second vertical rib 51 of the support sleeve 5 is disengaged from the first vertical rib 21 of the dose setting knob 2, and at the same time, the first vertical tooth 102 on the fixed gear 10 and the second vertical tooth 114 on the housing 1 are disengaged; under the action of the torsion spring 8, the energy storage sleeve 7 drives the fixed gear 10 to drive the reverse limit 13, and drives the screw 12 to rotate, and the screw 12 moves forward under the limitation of the advancing thread 14.

[0075] The final dose is locked. Each time a dose is set, the dose setting knob 2 drives the support sleeve 5 to rotate. The limiter 9 is limited by the fixed gear 10, and the fixed gear 10 is restricted from rotating by the housing 1. The first internal thread 54 cooperates with the first external thread 91 to lift the limiter 9 until the top end surface 93 is supported by the internal thread rear end portion 55 of the support sleeve 5. The support sleeve 5 can no longer rotate, thereby locking the final dose.

[0076] The present invention can not only realize dose setting, but also realize dose recall and last dose locking, thereby better adjusting the dose and preventing sub-dose injection. The present invention can store energy in the energy storage drive mechanism while setting the dose.

Claims

1. An energy storage injection pen, comprising A housing (1) which is a hollow structure; a screw (12) that spirally advances to push a piston in a cartridge (16) to inject the drug; An energy storage drive mechanism is installed between the housing (1) and the screw (12) and is used to drive the screw (12) forward; A dose adjustment mechanism, which can perform dose setting, dose recall and final dose locking, and triggers the energy storage drive mechanism to store energy when the dose is set, and triggers the energy storage drive mechanism to drive the screw (12) when the injection is performed; a dose indicator (4), which is installed between the energy storage drive mechanism and the housing (1) and is used for dose indication; A dose setting knob is connected to the rear end of the housing (1) and can be rotated to drive the dose adjustment mechanism to set or recall the dose; A button (3) is mounted on the dosage adjustment mechanism and is used to enable the dosage adjustment mechanism to trigger the energy storage drive mechanism to drive the screw (12) after being pressed.

2. The energy storage injection pen according to claim 1, characterized in that: The dose adjustment mechanism comprises a support sleeve (5), the button (3) is mounted on the rear end of the support sleeve (5), the dose setting knob (2) is rotatably connected to the support sleeve (5) and can slide axially relative to the support sleeve (5), and the front end of the support sleeve (5) is connected to the energy storage drive mechanism via a transmission sleeve (6).

3. The energy storage injection pen according to claim 2, characterized in that: The support sleeve (5) is internally spirally connected to a limiting member (9), and the final dose is locked when the top end surface of the limiting member (9) contacts the internal thread rear end portion (55) of the support sleeve (5).

4. The energy storage injection pen according to claim 2, characterized in that: The energy storage drive mechanism comprises an energy storage sleeve (7), which is arranged outside the support sleeve (5) and is linked via a transmission sleeve (6). A torsion spring (8) for energy storage is provided between the energy storage sleeve (7) and the support sleeve (5), one end of the torsion spring (8) is connected to the energy storage sleeve (7), and the other end thereof is connected to the housing (1).

5. The energy storage injection pen according to claim 4, characterized in that: The front end of the energy storage sleeve (7) is provided with a fixed gear (10) which can be engaged with the energy storage sleeve to limit its direction of rotation. The fixed gear (10) can be engaged with the housing (1) and then stopped and axially moved relative to the housing (1). When the support sleeve (5) rotates in the dose setting direction, the transmission sleeve (6) rotates to drive the energy storage sleeve (7) to rotate, and then the torsion spring (8) rotates to store energy. At this time, the fixed gear (10) is engaged with the housing (1) and stopped. When the support sleeve (5) rotates in the dose call-back direction, the transmission sleeve (6) moves axially forward to separate the fixed gear (10) from the energy storage sleeve (7). The energy storage sleeve (7) rotates in the opposite direction under the action of the torsion spring (8) to call back the dose.

6. The energy storage injection pen according to claim 5, characterized in that: The front end of the fixed gear (10) is provided with a reverse limiter (13) which can rotate synchronously with the fixed gear (10). A spring for axially supporting the fixed gear (10) and causing the fixed gear (10) to engage with the energy storage sleeve (7) is provided between the reverse limiter (13) and the fixed gear (10). The screw (12) is inserted into the reverse limiter (13) and driven to rotate by the reverse limiter (13). When an injection is performed, the support sleeve (5) moves downward and disengages from the dose setting knob (2), and the energy storage sleeve (7) moves downward synchronously to disengage the fixed gear (10) from the housing (1). As a result, the energy storage sleeve (7), the fixed gear (10) and the reverse limiter (13) rotate synchronously under the drive of the torsion spring (8), driving the screw (12) to rotate.

7. The energy storage injection pen according to claim 6, characterized in that: The reverse limiter (13) is fixed on the forward thread (14), and the forward thread (14) is fixedly installed in the housing (1). The front end of the screw rod (12) passes through the forward thread (14) and is connected to a push plate (15). The thread between the screw rod (12) and the forward thread (14) limits forward movement.

8. The energy storage injection pen according to claim 6, characterized in that: The reversal limiter (13) is provided with a cantilever (131) which can cooperate with the directional teeth (115) on the housing (1) so that the reversal limiter (13) can only rotate in one direction.

9. The energy storage injection pen according to claim 4, 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 between the first groove (73) and the first straight surface (612) is a second straight surface (732), and the matching surface between 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 (10) from the energy storage sleeve (7).

10. The energy storage injection pen according to claim 1, characterized in that: It also includes a cartridge holder (17) in which a cartridge bottle (16) is installed and connected to the front end of the housing (1), and the front end is used to install an injection needle; a pen cap (18) is buckled on the cartridge holder (17).

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