An injection pen

Abstract

The present invention discloses an injection pen comprising a housing and a dose adjustment device. The dose adjustment device includes a toggle lever, which is coaxial with the housing and rotatable relative to the housing. The inner wall of the housing is provided with a plurality of toggle locking grooves along the circumference. The toggle lever is provided with a plurality of elastic plungers that elastically deform in the radial direction, the positions of the elastic plungers corresponding to the positions of the toggle locking grooves. The toggle lever also includes a pressing and resetting device for resetting the toggle lever, the pressing and resetting device being connected to the toggle lever. The present invention aims to provide an injection pen that can maintain reliable operation and achieve precise injections.

Description

Technical Field

[0001] The present invention relates to the field of medical devices, and in particular to an injection pen. Background Art

[0002] An injection pen is a drug delivery device widely used to treat chronic conditions such as diabetes and growth hormone deficiency. Resembling a fountain pen, it houses a drug reservoir (which contains a cartridge containing the medication) and an injection mechanism. Compared to traditional syringes, the injection pen is more portable and significantly improves patient compliance.

[0003] As shown in the Chinese invention patent application number CN201980072531.2, the existing injection pen has the following problems: 1. Its transmission structure is too complicated and involves many parts, which not only increases the difficulty of production and assembly, but also increases the unreliability of the transmission; 2. The overly complicated transmission of components may cause the transmission components to wear or slip after several adjustments, resulting in a deviation between the actual set dose and the desired set dose; 3. Even if the actual set dose is consistent with the value of the desired set dose, the existing injection pen uses a mechanical transmission to drive a small screw to press the medicine bottle to complete the injection of the specified dose. Due to the possibility of wear or slippage in the mechanical transmission, During the transmission process, the actually set dose may not be fully converted into the feed amount of the small screw, resulting in an error in the actual injection dose, affecting the patient's treatment effect; 4. For ease of operation, after completing an injection, existing injection pens usually use an automatic reset method to reset the dose adjustment device to the initial dose adjustment position. Due to the large number of parts, during the reset process, the transmission parts may not be fully reset or even cannot be reset at all due to wear, slippage, etc., which makes it impossible for the injection pen to accurately adjust the dose next time. The injection pen may not be used again, and the drugs in the injection pen and the medicine chamber are wasted prematurely, increasing the burden on patients. Summary of the Invention

[0004] Purpose of the invention: The purpose of the present invention is to provide an injection pen that can maintain reliable working conditions and achieve accurate injection.

[0005] Technical Solution: The injection pen disclosed herein comprises a housing and a dose adjustment device. The dose adjustment device includes a toggle lever, which is coaxial with the housing and rotatable relative to the housing. The inner wall of the housing is provided with a plurality of toggle locking grooves along a circumferential direction. The toggle lever is provided with a plurality of elastic plungers that elastically deform in the radial direction, the positions of the elastic plungers corresponding to the positions of the toggle locking grooves. The pen also includes a pressing and resetting device for injecting and resetting the toggle lever, the pressing and resetting device being connected to the toggle lever. The elastic plungers are configured to extend into the toggle locking grooves using elastic force to lock the relative position of the toggle lever and the housing. The elastic plungers can be provided in various styles, including a single elastic member or a combination of an elastic member and other components.

[0006] Furthermore, the pressing and resetting device includes a button and an injection spring, the button is detachably connected to the end of the toggle rod away from the injection end, one end of the injection spring acts on the button, and the other end of the injection spring acts on the shell to abut.

[0007] Furthermore, a hollow adjustment knob is disposed outside the housing, the adjustment knob abutting one end of the housing, one end of the injection spring abutting the button, and the other end of the injection spring abutting the adjustment knob. The adjustment knob abutting one end of the housing ensures that the relative position of the adjustment knob and the housing along the central axis remains unchanged during injection. Therefore, the adjustment knob can be considered a part of the housing along the central axis. When the button is pressed to inject, the injection spring is compressed and stores energy, exerting an upward elastic force (i.e., in the direction opposite to the pressing direction). After the injection is completed, the button, under the action of the injection spring, drives the toggle lever to reset, and the outer toggle projection on the toggle lever resumes engagement with the inner knob projection within the adjustment knob, facilitating the next dose adjustment.

[0008] Furthermore, the inner wall of the adjustment knob is provided with a plurality of knob transmission devices, and the outer wall of the toggle rod is provided with a plurality of toggle transmission devices adapted to mate with the knob transmission devices. When the knob transmission devices and the toggle transmission devices engage, the present invention is in the first position (adjustment position). At this point, rotating the adjustment knob drives the adjustment rod to rotate about its central axis. When an injection is required, the button is pressed, mechanically transmitting the force until the dial cover engages with the drive device. This engagement of the dial cover and the drive device represents the present invention's second position (injection position).

[0009] Furthermore, the knob transmission device comprises a plurality of tooth-shaped inner knob protrusions, which protrude radially from the adjustment knob toward the inner cavity of the adjustment knob. The toggle transmission device comprises a plurality of tooth-shaped outer toggle protrusions, which protrude radially outward from the toggle rod. The inner knob protrusions are configured to engage with the outer toggle protrusions. The inner knob protrusions and the outer toggle protrusions cooperate to serve two functions: 1. After the inner knob protrusions engage with the outer toggle protrusions, the adjustment knob can drive the toggle rod to rotate during rotation, thereby accumulating force in the dose spring; and 2. After injection begins, the toggle rod moves along the central axis toward the injection end, while the adjustment knob does not move along the central axis. The inner knob protrusions guide the outer toggle protrusions, assisting in the displacement of the toggle rod.

[0010] Furthermore, the toggle rod is movably connected to the housing, so that the toggle rod can be retracted relative to the housing along the central axis of the housing.

[0011] Furthermore, each elastic plunger includes a locking member and an elastic member, with the bottom of the locking member abutting against the elastic member (e.g., a locking spring). The locking member can be in a variety of forms, including a spherical solid such as a sphere or hemisphere, a regular solid such as a cube or trapezoid, or other irregularly shaped solids.

[0012] Furthermore, the toggle lever is provided with a toggle disk, a locking groove is defined in the toggle disk, one end of the elastic plunger abuts against the bottom of the locking groove, and the other end of the elastic plunger abuts against the locking member. For example, if the locking member included in the elastic plunger is a locking ball and the elastic member is a locking spring, one end of the locking spring abuts against the bottom of the locking groove, and the other end of the locking spring abuts against the locking ball.

[0013] Furthermore, the toggle rod is provided with a detachable dial cover at one end close to the injection end, and a plurality of dial positioning devices are provided on the side of the dial cover close to the injection end. The toggle rod also includes a driving device coaxial with the toggle rod, and the driving device is located on the side of the toggle rod close to the injection end. The driving device is provided with a plurality of driving positioning devices cooperating with the dial positioning device at one end close to the toggle rod.

[0014] Furthermore, the dial positioning device is a dial positioning protrusion protruding along the direction of the central axis toward the driving device, and the driving positioning device is a driving positioning groove, and the dial positioning protrusion corresponds to the driving positioning groove in position.

[0015] Furthermore, the dial positioning device is a dial positioning inner protrusion arranged on the inner wall of the dial cover, and the dial positioning inner protrusion protrudes toward the inner cavity of the dial cover along the radial direction of the dial cover. The drive positioning device is a drive positioning outer protrusion arranged on the outer wall of the drive device, and the drive positioning outer protrusion protrudes outward along the radial direction of the drive device. The dial positioning inner protrusion is used to engage with the drive positioning outer protrusion.

[0016] Furthermore, the device further includes a small screw, which is connected to the interior of the drive unit via a spiral drive. The spiral drive refers to a spiral guide protrusion provided on the inner wall of the drive unit, a spiral stepping groove formed on the outer periphery of the small screw, the guide protrusion matching the spiral angle of the stepping groove, and a sliding connection between the guide protrusion and the stepping groove. When the small screw rotates, it is guided by the guide protrusion and displaced along the central axis of the small screw toward the injection end. The small screw is used to press the piston in the cartridge to achieve injection.

[0017] Furthermore, the small screw is provided with a snap-fit groove, and the drive device includes a screw guide sleeve and a drive sleeve. The inner wall of the drive sleeve is provided with a snap-fit protrusion that cooperates with the snap-fit groove, and the snap-fit protrusion extends into the snap-fit groove. The inner wall of the screw guide sleeve is provided with a spiral guide protrusion. The screw guide sleeve is detachably connected to the housing via a snap fastener. The snap-fit groove extends along the axial direction of the small screw. The snap-fit protrusion and the snap-fit groove cooperate to enable the drive sleeve to drive the small screw to rotate. When injection is performed, the dial cover engages with the drive sleeve, and the toggle rod drives the drive sleeve to rotate. The drive sleeve is driven by the snap-fit protrusion and the snap-fit groove to drive the small screw to rotate. The small screw is guided by the guide protrusion on the inner wall of the screw guide sleeve and moves toward the injection end along the direction of the small screw's central axis.

[0018] Furthermore, the small screw is provided with a limiting tooth, which is connected to the small screw via a spiral drive. That is, a spiral limiting protrusion is also provided inside the limiting tooth, and the limiting protrusion matches the angle of the spiral stepping groove formed on the outer circumference of the small screw, and the limiting protrusion and the stepping groove are slidingly connected.

[0019] Furthermore, a plurality of limiting protrusions are evenly distributed on the periphery of the limiting teeth, a plurality of first limiting sliding grooves for sliding connection with the limiting protrusions are arranged inside the toggle rod, and the limiting protrusions are slidably connected with the first limiting sliding grooves.

[0020] Furthermore, a screw limiting block is provided on the small screw for limiting contact with the limiting tooth.

[0021] Furthermore, the screw guide sleeve is located on a side of the drive sleeve close to the injection end.

[0022] Furthermore, a dose spring is sleeved on the outer wall of the toggle rod, one end of the dose spring is fixedly connected to the toggle rod, and the other end of the dose spring is fixedly connected to the housing. When the toggle rod rotates around its central axis, the dose spring twists, thereby storing force.

[0023] Furthermore, the toggle lever is fixedly connected to the hollow sleeve, and a spring retaining buckle is sleeved on the outer wall of the toggle lever. One end of the dose spring is fixedly connected to the sleeve, and the other end of the dose spring is fixedly connected to the spring retaining buckle. The dose spring is a torsion spring. In this case, the toggle lever and sleeve can be considered to be integral, and the spring retaining buckle is fixedly connected to the housing. The spring retaining buckle can also be considered to be integral with the housing.

[0024] Furthermore, the shell is provided with an outer cover window, the outer wall of the toggle rod is connected to the scale cylinder, the outer wall of the scale cylinder is provided with a plurality of scales, and the outer wall of the scale cylinder corresponds to the position of the outer cover window.

[0025] Furthermore, the toggle rod is fixedly connected to the hollow sleeve, the outer wall of the sleeve is provided with a plurality of cylinder-sleeve connecting parts, the inner wall of the scale cylinder is provided with a plurality of engraved cylinder connecting parts for connecting with the cylinder-sleeve connecting parts, and the positions of the engraved cylinder connecting parts correspond to those of the cylinder-sleeve connecting parts.

[0026] Furthermore, the tube-sleeve connecting portion is a tube-sleeve convex block, the engraved tube connecting portion is an inner groove of the engraved tube, and the tube-sleeve convex block extends into the inner groove of the engraved tube.

[0027] Furthermore, the cylinder-sleeve connecting portion is a cylinder-sleeve groove, the engraved cylinder connecting portion is an engraved cylinder convex block, and the engraved cylinder convex block extends into the cylinder-sleeve groove.

[0028] Furthermore, a sliding window is provided on the outer surface of the graduated cylinder. The sliding window is provided with a plurality of movable windows corresponding to the outer cover windows. The graduated cylinder is slidably connected to the sliding window.

[0029] Furthermore, the outer wall of the graduated cylinder is provided with a spiral outer groove, and the inner wall of the sliding window is provided with a spiral moving protrusion. The spiral angle of the outer groove matches that of the moving protrusion, and the outer groove is slidably connected to the moving protrusion.

[0030] Furthermore, the outer wall of the sliding window is provided with a sliding rib, the inner wall of the housing is provided with an inner housing slideway, and the sliding rib is slidably connected to the inner housing slideway. The sliding rib-inner housing slideway sliding connection allows the sliding window to slide only along the direction of the inner housing slideway.

[0031] Furthermore, the direction of the inner-shell slideway is parallel to the central axis of the shell.

[0032] Furthermore, it also includes a positioning ring that is sleeved on the outside of the toggle rod, and the positioning ring is used to limit the sliding window. The positioning ring is located on the side of the sliding window away from the injection end, between the sliding window and the adjustment knob. The positioning ring is ring-shaped, and the positioning ring is detachably connected to the shell by a snap.

[0033] Furthermore, an inner limit block is provided on the inner wall of the shell, and the inner limit block is used to limit the sliding window and is located on a side of the sliding window close to the injection end.

[0034] The invention has the following significant advantages over the prior art: 1. The invention has a simple structure and fewer transmission parts, which is convenient for workers to produce and assemble, and also improves the reliability of transmission; 2. When adjusting the dose, the user rotates the adjusting knob, and the adjusting knob drives the toggle rod to rotate through the knob transmission device, and the elastic plunger is squeezed by the shell and contracts toward the toggle rod. Since the bottom of the elastic plunger is made of an elastic member, the wear between the elastic plunger and the shell is less, and the transmission is more accurate during the dose adjustment process, ensuring that the actual set dose is consistent with the desired set dose; 3. After the dose is adjusted, the elastic plunger extends into the locking groove to lock the relative position of the toggle rod and the shell, preventing the toggle rod from rotating under the action of the dose spring, thereby keeping the relative position relationship between the toggle rod and the shell stable, and ensuring the accuracy of the injection dose; 4. After the injection is completed, release the button, and under the action of the injection spring, the button drives the toggle rod to return to the first position, and the outer toggle protrusion on the toggle rod resumes engagement with the knob inner protrusion in the adjusting knob, which is convenient for adjusting the dose next time; 5. When the adjusting knob is rotated, the spring The spring positioning buckle does not rotate with the toggle lever. The sleeve rotates with the toggle lever due to its fixed connection to the toggle lever. Therefore, during the adjustment process, the dose spring accumulates energy due to torsion. After the injection is started, the button pushes the toggle lever to slide toward the drive sleeve until the dial cover engages with the drive sleeve. The dose spring begins to release the stored energy, driving the toggle lever to rotate in the direction of the energy release, thereby driving the drive sleeve and the small screw to rotate. The small screw is then guided by the screw guide sleeve along the central axis and presses the vial to inject the drug. Because the dial positioning device and the drive positioning device are in a meshing relationship, the connection between the toggle lever and the drive sleeve is more precise, so the actual set dose is accurately converted into the feed amount of the small screw, thereby accurately controlling the injection amount of the drug. 6. When adjusting the dose of the present invention, rotating the adjustment knob does not cause the toggle lever to extend along the central axis relative to the housing. That is, the relative distance between the button and the housing along the central axis remains unchanged. Therefore, the present invention is more convenient for patients with special needs, such as those with small palms, those with inconvenient finger movement, and those who need to inject with one hand. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a perspective view of the present invention.

[0036] Figure 2 This is an exploded view of the first embodiment of the present invention.

[0037] Figure 3 It is a cross-sectional view of the first embodiment of the present invention.

[0038] Figure 4 for Figure 3 Enlarged view at point A.

[0039] Figure 5 for Figure 3 Enlarged view at B.

[0040] Figure 6 FIG. 4 is a perspective view of the first toggle lever in the first embodiment of the present invention.

[0041] Figure 7 2 is a cross-sectional view of the first toggle lever in the first embodiment of the present invention.

[0042] Figure 8 for Figure 7 Enlarged view at C.

[0043] Figure 9 FIG. 1 is a top view of the housing in the first embodiment of the present invention.

[0044] Figure 10 2 is a perspective view of the housing in the first embodiment of the present invention.

[0045] Figure 11 Schematic diagram of the connection between the first toggle lever and the adjustment knob in the first embodiment of the present invention.

[0046] Figure 12 for Figure 11 Enlarged view at D.

[0047] Figure 13 Schematic diagram of the connection between the first toggle rod and the sleeve in the first embodiment of the present invention.

[0048] Figure 14 4 is a perspective view of the first driving sleeve in the first embodiment of the present invention.

[0049] Figure 15 This is a three-dimensional diagram of the combination of the small screw and the limiting teeth in the first embodiment of the present invention.

[0050] Figure 16 It is a three-dimensional diagram of the screw guide sleeve in the first embodiment of the present invention.

[0051] Figure 17 It is a combined sectional view of the screw guide sleeve and the first drive sleeve in the first embodiment of the present invention.

[0052] Figure 18 It is a combined stereogram of the sleeve, sliding window, scale cylinder and positioning ring in the first embodiment of the present invention.

[0053] Figure 19 FIG. 1 is a perspective view of a sliding window according to a first embodiment of the present invention.

[0054] Figure 20 It is a three-dimensional diagram of the graduated cylinder in the first embodiment of the present invention.

[0055] Figure 21 FIG. 4 is a perspective view of a second toggle lever in a second embodiment of the present invention.

[0056] Figure 22 4 is a perspective view of the second driving sleeve in the second embodiment of the present invention.

[0057] Wherein: 1. dose spring; 2. small screw; 201. snap-fit groove; 202. screw limit block; 3. limit tooth; 301. limit protrusion; 4. screw guide sleeve; 5. first drive sleeve; 501. drive positioning outer protrusion; 502. first snap-fit protrusion; 6. first toggle lever; 601. first dial cover; 6011. dial positioning inner protrusion; 602. first toggle plate; 6021. first locking ball; 603. first toggle outer protrusion; 604. first limit slide; 7. sleeve; 701. sleeve protrusion; 702. sleeve groove; 8. graduated cylinder; 801. outer groove of graduated cylinder; 802. inner groove of graduated cylinder; 803. graduated cylinder protrusion; 9. pen cap; 10. medicine chamber; 11. sliding window; 1 101. Traveling window; 1102. Traveling sliding rib; 1103. Traveling protrusion; 12. Positioning ring; 13. Spring positioning buckle; 14. Adjusting knob; 1401. Knob inner protrusion; 15. Push button; 16. Injection spring; 17. Housing; 1701. Toggle locking groove; 1702. Limit block in housing; 1703. Outer cover window; 1704. Housing inner slide; 18. Second toggle lever; 1801. Second dial cover; 18011. Dial positioning protrusion; 1802. Second toggle disk; 1803. Second toggle outer protrusion; 1804. Second limiting slide groove; 18021. Second locking ball; 19. Second driving sleeve; 1901. Driving positioning groove; 1902. Second snap-fit protrusion. DETAILED DESCRIPTION

[0058] The technical solution of the present invention will be further described below with reference to the accompanying drawings.

[0059] Example 1

[0060] See attached Figures 1 to 20 The injection pen shown in the present invention includes a dose spring 1, a small screw 2, a limiting tooth 3, a screw guide sleeve 4, a first drive sleeve 5, a first toggle rod 6, a sleeve 7, a scale cylinder 8, a pen cap 9, a medicine chamber 10, a sliding window 11, a positioning ring 12, a spring positioning buckle 13, an adjustment knob 14, a button 15, an injection spring 16 and a housing 17.

[0061] An injection pen includes a housing 17 and a dose adjustment device, the dose adjustment device including a first toggle lever 6, which is coaxial with the housing 17 and movably connected to the housing 17 so that the first toggle lever 6 can extend or retract relative to the housing 17 along the central axis of the housing 17. The inner wall of the housing 17 is provided with a plurality of toggle locking grooves 1701 along the circumferential direction. A first toggle disk 602 is provided on the first toggle lever 6, and two locking grooves are symmetrically provided in the first toggle disk 602. An elastic plunger that elastically deforms along the radial direction is provided in each locking groove, and the position of the elastic plunger corresponds to the position of the toggle locking groove 1701. Each elastic plunger includes a first locking ball 6021. The bottom of the first locking ball 6021 abuts against a locking spring, one end of the locking spring abuts against the bottom of the locking groove, and the other end of the locking spring abuts against the first locking ball 6021.

[0062] The first dial cover 601 is detachably provided at the end of the first dial rod 6 near the injection end, and a plurality of dial positioning inner protrusions 6011 are provided on the side of the first dial cover 601 near the injection end. The dial positioning inner protrusions 6011 protrude toward the inner cavity of the first dial cover 601 along the radial direction of the first dial cover 601, and also include a driving device provided on the side of the first dial rod 6 near the injection end. The driving device in this embodiment includes a first driving sleeve 5 and a screw guide sleeve 4. The first driving sleeve 5 and the screw guide sleeve 4 are coaxial with the first toggle rod 6. The first driving sleeve 5 and the screw guide sleeve 4 are coaxial with the first toggle rod 6. A plurality of driving positioning outer protrusions 501 cooperating with the dial positioning device are provided at the end of the first driving sleeve 5 near the first toggle rod 6. The driving positioning outer protrusion 501 protrudes outward along the radial direction of the first driving sleeve 5, and the dial positioning inner protrusions 6011 are engaged with the driving positioning outer protrusion 501. In order to cooperate more reliably with the small screw 2 in this embodiment, a connecting column is provided on the screw guide sleeve 4, and the connecting column extends into the inner cavity of the first driving sleeve 5.

[0063] A clamping groove 201 is provided on the small screw 2, and a first clamping protrusion 502 that matches the clamping groove 201 is provided on the inner wall of the first driving sleeve 5. The first clamping protrusion 502 extends into the clamping groove 201. A spiral guide protrusion is provided on the inner wall of the screw guide sleeve 4. A spiral stepping groove is provided on the outer periphery of the small screw 2. The guide protrusion matches the spiral angle of the stepping groove. Therefore, the interior of the driving device (specifically, the screw guide sleeve 4) is connected to the small screw 2 through spiral drive.

[0064] The first toggle rod 6 is fixedly connected to the hollow sleeve 7. A spring positioning buckle 13 is sleeved on the outer wall of the first toggle rod 6. A dose spring 1 is set in the inner cavity of the sleeve 7. One end of the dose spring 1 is fixedly connected to the sleeve 7, and the other end of the dose spring 1 is fixedly connected to the spring positioning buckle 13.

[0065] An adjusting knob 14 is provided on the outside of the first toggle rod 6, and a plurality of knob inner protrusions 1401 are provided on the inner wall of the adjusting knob 14. The knob inner protrusions 1401 protrude toward the inner cavity of the adjusting knob 14 along the radial direction of the adjusting knob 14. A plurality of first toggle outer protrusions 603 for matching with the knob transmission device are provided on the outer wall of the first toggle rod 6. The first toggle outer protrusions 603 protrude outward along the radial direction of the first toggle rod 6, and the knob inner protrusions 1401 and the first toggle outer protrusions 603 are engaged with each other.

[0066] The end of the first toggle rod 6 away from the injection end is detachably connected to the button 15 , and an injection spring 16 is provided between the button 15 and the adjustment knob 14 . One end of the injection spring 16 abuts against the button 15 , and the other end of the injection spring 16 abuts against the adjustment knob 14 .

[0067] Two limiting protrusions 301 are symmetrically arranged on the outer periphery of the limiting tooth 3, and two first limiting grooves 604 for sliding connection with the limiting protrusions 301 are arranged inside the first toggle rod 6, and the limiting protrusions 301 are slidingly connected to the first limiting grooves 604; the interior of the limiting tooth 3 is connected to the small screw 2 through a spiral drive, that is, a spiral limiting protrusion is also arranged inside the limiting tooth 3, and the limiting protrusion matches the angle of the spiral stepping groove opened on the outer periphery of the small screw 2, and the limiting protrusion is slidingly connected to the stepping groove. When adjusting the dose, the adjusting knob 14 drives the first toggle rod 6 to rotate. The first toggle rod 6 drives the limiting tooth 3 to rotate by relying on the connection transmission of the limiting protrusion 301-the first limiting slot 604. The limiting tooth 3 moves relative to the small screw 2 along the central axis in the direction away from the injection end. During injection, because the first dial cover 601 is engaged with the first drive sleeve 5, the dose spring 1 begins to release the stored energy to drive the first toggle rod 6, the first drive sleeve 5 and the limiting tooth 3 to rotate synchronously. Therefore, the relative position relationship between the limiting tooth 3 and the small screw 2 in the central axis direction remains unchanged. When the next injection is needed, the adjusting knob 14 is rotated again. Driven by the first toggle rod 6, the limiting tooth 3 continues to move relative to the small screw 2 along the central axis in the direction away from the injection end until it abuts against the screw limit block 202 provided on the small screw 2. After the limiting tooth 3 abuts against the screw limit block 202, the small screw 2 has no further displacement stroke relative to the injection end, so it cannot be injected again.

[0068] The housing 17 is provided with an outer cover window 1703, the toggle rod is fixedly connected to the hollow sleeve 7, the outer wall of the sleeve 7 is provided with a plurality of sleeve-sleeve connecting parts, the inner wall of the scale cylinder 8 is provided with a plurality of engraved cylinder connecting parts for connecting with the sleeve-sleeve connecting parts, the engraved cylinder connecting parts correspond to the positions of the sleeve-sleeve connecting parts, the sleeve-sleeve connecting parts are both sleeve protrusions 701 and sleeve grooves 702, the engraved cylinder connecting parts are both engraved cylinder inner grooves 802 and engraved cylinder protrusions 803, the sleeve protrusions 701 extend into the engraved cylinder inner grooves 802, the engraved cylinder protrusions 803 extend into the sleeve grooves 702, the outer wall of the scale cylinder 8 is provided with a plurality of scales, and the outer wall of the scale cylinder 8 is connected to the outer cover window 1703. The positions correspond to each other; a sliding window 11 is provided on the outer surface of the scale cylinder 8, and a moving window 1101 corresponding to the outer cover window 1703 is provided on the sliding window 11; the outer wall of the scale cylinder 8 is provided with a spiral outer groove 801, and the inner wall of the sliding window 11 is provided with a spiral moving protrusion 1103, the spiral angle of the outer groove 801 and the moving protrusion 1103 match, and the outer groove 801 and the moving protrusion 1103 are slidingly connected; the outer wall of the sliding window 11 is provided with a moving sliding rib 1102, and the inner wall of the shell 17 is provided with an inner shell slide 1704, and the moving sliding rib 1102 is slidingly connected to the inner shell slide 1704. The wandering sliding rib 1102 is slidably connected to the inner slide 1704 of the shell, so that the sliding window 11 can only slide along the direction of the inner slide 1704 of the shell; the direction of the inner slide 1704 of the shell is parallel to the central axis of the shell 17; it also includes a positioning ring 12 arranged on the outside of the toggle rod, and the positioning ring 12 is used to limit the sliding window 11. The positioning ring 12 is located on the side of the sliding window 11 away from the injection end, between the sliding window 11 and the adjusting knob 14. The positioning ring 12 is annular, and the positioning ring 12 is detachably connected to the shell 17 by a snap buckle; an inner limit block 1702 is provided on the inner wall of the shell 17, and the inner limit block 1702 is used to limit the sliding window 11, and is located on the side of the sliding window 11 close to the injection end.

[0069] Example 2

[0070] See attached Figures 21 and 22 Please refer to the attached Figures 1 to 20 The injection pen shown in the present invention includes a dose spring 1, a small screw 2, a limiting tooth 3, a screw guide sleeve 4, a second drive sleeve 19, a second toggle lever 18, a sleeve 7, a scale cylinder 8, a pen cap 9, a medicine chamber 10, a sliding window 11, a positioning ring 12, a spring positioning buckle 13, an adjustment knob 14, a button 15, an injection spring 16 and a housing 17.

[0071] An injection pen includes a housing 17 and a dose adjustment device, the dose adjustment device including a second toggle lever 18, which is coaxial with the housing 17 and movably connected to the housing 17 so that the second toggle lever 18 can extend or retract relative to the housing 17 along the central axis of the housing 17. The inner wall of the housing 17 is provided with a plurality of toggle locking grooves 1701 along the circumferential direction. The second toggle lever 18 is provided with a second toggle disk 1802, and two locking grooves are symmetrically defined in the second toggle disk 1802. Each locking groove is provided with an elastic plunger that elastically deforms in the radial direction, and the position of the elastic plunger corresponds to the position of the toggle locking groove 1701. Each elastic plunger includes a second locking ball 18021. The bottom of the second locking ball 18021 abuts against a locking spring, one end of the locking spring abuts against the bottom of the locking groove, and the other end of the locking spring abuts against the second locking ball 18021.

[0072] The second toggle rod 18 is detachably provided with a second dial cover 1801 at the end close to the injection end. The second dial cover 1801 is provided with a plurality of dial positioning protrusions 18011 protruding toward the second drive sleeve 19 along the direction of the center axis on the side close to the injection end. It also includes a driving device provided on the side of the second toggle rod 18 close to the injection end. The driving device in this embodiment includes a second drive sleeve 19 and a screw guide sleeve 4. The second drive sleeve 19 and the screw guide sleeve 4 are coaxial with the second toggle rod 18. The second drive sleeve 19 is provided with a plurality of drive positioning grooves 1901 that cooperate with the dial positioning device at the end close to the second toggle rod 18. The dial positioning protrusions 18011 correspond to the positions of the drive positioning grooves 1901. In this embodiment, in order to cooperate more reliably with the small screw 2, the screw guide sleeve 4 is provided with a connecting column, which extends into the inner cavity of the second drive sleeve 19.

[0073] A clamping groove 201 is provided on the small screw 2, and a second clamping protrusion 1902 matching the clamping groove 201 is provided on the inner wall of the second drive sleeve 19, and the second clamping protrusion 1902 extends into the clamping groove 201. A spiral guide protrusion is provided on the inner wall of the screw guide sleeve 4, and a spiral stepping groove is provided on the outer periphery of the small screw 2. The guide protrusion matches the spiral angle of the stepping groove, so that the interior of the driving device (specifically, the screw guide sleeve 4) is connected to the small screw 2 through spiral drive.

[0074] The second toggle rod 18 is fixedly connected to the hollow sleeve 7. A spring positioning buckle 13 is sleeved on the outer wall of the second toggle rod 18. A dose spring 1 is set in the inner cavity of the sleeve 7. One end of the dose spring 1 is fixedly connected to the sleeve 7, and the other end of the dose spring 1 is fixedly connected to the spring positioning buckle 13.

[0075] An adjusting knob 14 is provided on the outside of the second toggle rod 18, and a plurality of knob inner protrusions 1401 are provided on the inner wall of the adjusting knob 14. The knob inner protrusions 1401 protrude toward the inner cavity of the adjusting knob 14 along the radial direction of the adjusting knob 14. A plurality of second toggle outer protrusions 1803 for matching with the knob transmission device are provided on the outer wall of the second toggle rod 18. The second toggle outer protrusions 1803 protrude outward along the radial direction of the second toggle rod 18, and the knob inner protrusions 1401 and the second toggle outer protrusions 1803 are engaged with each other.

[0076] The end of the second toggle rod 18 away from the injection end is detachably connected to the button 15 , and an injection spring 16 is provided between the button 15 and the adjustment knob 14 . One end of the injection spring 16 abuts against the button 15 , and the other end of the injection spring 16 abuts against the adjustment knob 14 .

[0077] Two limiting protrusions 301 are symmetrically arranged on the outer periphery of the limiting tooth 3, and two second limiting grooves 1804 for sliding connection with the limiting protrusions 301 are arranged inside the second toggle rod 18, and the limiting protrusions 301 are slidingly connected to the second limiting grooves 1804; the interior of the limiting tooth 3 is connected to the small screw 2 through a spiral drive, that is, a spiral limiting protrusion is also arranged inside the limiting tooth 3, and the limiting protrusion matches the angle of the spiral stepping groove opened on the outer periphery of the small screw 2, and the limiting protrusion is slidingly connected to the stepping groove. When adjusting the dose, the adjusting knob 14 drives the second toggle rod 18 to rotate. The second toggle rod 18 drives the limiting tooth 3 to rotate by relying on the connection transmission of the limiting protrusion 301 and the second limiting slot 1804. The limiting tooth 3 moves relative to the small screw 2 along the central axis in the direction away from the injection end. During injection, because the second dial cover 1801 is engaged with the second drive sleeve 19, the dose spring 1 begins to release the stored energy to drive the second toggle rod 18, the second drive sleeve 19 and the limiting tooth 3 to rotate synchronously. Therefore, the relative position relationship between the limiting tooth 3 and the small screw 2 in the central axis direction remains unchanged. When the next injection is required, the adjusting knob 14 is rotated again. Driven by the second toggle rod 18, the limiting tooth 3 continues to move relative to the small screw 2 along the central axis in the direction away from the injection end until it abuts against the screw limit block 202 provided on the small screw 2. After the limiting tooth 3 abuts against the screw limit block 202, the small screw 2 has no further displacement stroke relative to the injection end, so it cannot be injected again.

[0078] The housing 17 is provided with an outer cover window 1703, the toggle rod is fixedly connected to the hollow sleeve 7, the outer wall of the sleeve 7 is provided with a plurality of sleeve-sleeve connecting parts, the inner wall of the scale cylinder 8 is provided with a plurality of engraved cylinder connecting parts for connecting with the sleeve-sleeve connecting parts, the engraved cylinder connecting parts correspond to the positions of the sleeve-sleeve connecting parts, the sleeve-sleeve connecting parts are both sleeve protrusions 701 and sleeve grooves 702, the engraved cylinder connecting parts are both engraved cylinder inner grooves 802 and engraved cylinder protrusions 803, the sleeve protrusions 701 extend into the engraved cylinder inner grooves 802, the engraved cylinder protrusions 803 extend into the sleeve grooves 702, the outer wall of the scale cylinder 8 is provided with a plurality of scales, and the outer wall of the scale cylinder 8 is connected to the outer cover window 1703. The positions correspond to each other; a sliding window 11 is provided on the outer surface of the scale cylinder 8, and a moving window 1101 corresponding to the outer cover window 1703 is provided on the sliding window 11; the outer wall of the scale cylinder 8 is provided with a spiral outer groove 801, and the inner wall of the sliding window 11 is provided with a spiral moving protrusion 1103, the spiral angle of the outer groove 801 and the moving protrusion 1103 match, and the outer groove 801 and the moving protrusion 1103 are slidingly connected; the outer wall of the sliding window 11 is provided with a moving sliding rib 1102, and the inner wall of the shell 17 is provided with an inner shell slide 1704, and the moving sliding rib 1102 is slidingly connected to the inner shell slide 1704. The wandering sliding rib 1102 is slidably connected to the inner slide 1704 of the shell, so that the sliding window 11 can only slide along the direction of the inner slide 1704 of the shell; the direction of the inner slide 1704 of the shell is parallel to the central axis of the shell 17; it also includes a positioning ring 12 arranged on the outside of the toggle rod, and the positioning ring 12 is used to limit the sliding window 11. The positioning ring 12 is located on the side of the sliding window 11 away from the injection end, between the sliding window 11 and the adjusting knob 14. The positioning ring 12 is annular, and the positioning ring 12 is detachably connected to the shell 17 by a snap buckle; an inner limit block 1702 is provided on the inner wall of the shell 17, and the inner limit block 1702 is used to limit the sliding window 11, and is located on the side of the sliding window 11 close to the injection end.

Claims

1. An injection pen, characterized in that: The invention relates to a device for adjusting the dosage of the drug, wherein the device comprises a toggle rod, the toggle rod can be rotated relative to the housing, the inner wall of the housing is provided with a plurality of toggle locking grooves along the circumferential direction, the toggle rod is provided with a plurality of elastic plungers elastically deformed along the radial direction, the position of the elastic plungers corresponds to the position of the toggle locking grooves, and further comprises a pressing and resetting device, the pressing and resetting device is connected to the toggle rod, each of the elastic plungers comprises a locking piece and an elastic piece, the bottom of the locking piece abuts against the elastic piece; the pressing and resetting device comprises a button and an injection spring, the button is detachably connected to an end of the toggle rod away from the injection end, one end of the injection spring acts on the button, and the other end of the injection spring acts on the housing; a toggle disk is provided on the toggle rod, a locking groove is provided in the toggle disk, one end of the elastic plunger abuts against the bottom of the locking groove, and the other end of the elastic plunger abuts against the locking piece.

2. The injection pen according to claim 1, characterized in that: A hollow adjusting knob is disposed outside the shell. The adjusting knob abuts against one end of the shell. One end of the injection spring abuts against the button, and the other end of the injection spring abuts against the adjusting knob.

3. The injection pen according to claim 2, characterized in that: The inner wall of the adjusting knob is provided with a plurality of knob transmission devices, and the outer wall of the toggle rod is provided with a plurality of toggle transmission devices for matching with the knob transmission devices.

4. The injection pen according to claim 3, characterized in that: The knob transmission device is composed of a plurality of tooth-shaped inner knob protrusions, which protrude toward the inner cavity of the adjusting knob along the radial direction of the adjusting knob. The toggle transmission device is composed of a plurality of tooth-shaped outer toggle protrusions, which protrude outward along the radial direction of the toggle rod. The inner knob protrusions are used to engage with the outer toggle protrusions.

5. The injection pen according to claim 1, characterized in that: The locking piece is a spherical solid or a regular-shaped solid or an irregular-shaped solid. The elastic piece is a locking spring. One end of the locking spring abuts against the bottom of the locking groove, and the other end of the locking spring abuts against the locking piece.

6. The injection pen according to claim 1, characterized in that: The toggle rod is provided with a removable dial cover at one end close to the injection end, and a plurality of dial positioning devices are provided on the side of the dial cover close to the injection end. The toggle rod also includes a driving device coaxial with the toggle rod, and the driving device is located on the side of the toggle rod close to the injection end. The driving device is provided with a plurality of driving positioning devices that cooperate with the dial positioning device on the end close to the toggle rod.

7. The injection pen according to claim 6, characterized in that: The dial positioning device is a dial positioning protrusion protruding along the direction of the central axis toward the driving device, and the driving positioning device is a driving positioning groove. The dial positioning protrusion corresponds to the driving positioning groove in position.

8. The injection pen according to claim 6, characterized in that: The dial positioning device is a dial positioning inner protrusion arranged on the inner wall of the dial cover, and the dial positioning inner protrusion protrudes toward the inner cavity of the dial cover along the radial direction of the dial cover. The drive positioning device is a drive positioning outer protrusion arranged on the outer wall of the drive device, and the drive positioning outer protrusion protrudes outward along the radial direction of the drive device. The dial positioning inner protrusion is used to engage with the drive positioning outer protrusion.

9. The injection pen according to claim 6, characterized in that: The interior of the driving device is connected to the small screw through a spiral drive.

10. The injection pen according to claim 9, characterized in that: A snap-fit groove is provided on the small screw, and the driving device includes a screw guide sleeve and a driving sleeve. The inner wall of the driving sleeve is provided with a snap-fit protrusion that matches the snap-fit groove, and the snap-fit protrusion extends into the snap-fit groove. The inner wall of the screw guide sleeve is provided with a spiral guide protrusion, and the outer periphery of the small screw is provided with a spiral stepping groove. The guide protrusion matches the spiral angle of the stepping groove, and the guide protrusion is slidably connected to the stepping groove.

11. The injection pen according to claim 9, characterized in that: The small screw is provided with a limiting tooth, and the limiting tooth is connected to the small screw through a spiral drive.

12. The injection pen according to claim 11, characterized in that: A plurality of limiting protrusions are evenly distributed on the periphery of the limiting teeth, a plurality of first limiting sliding grooves for sliding connection with the limiting protrusions are arranged inside the toggle rod, and the limiting protrusions are slidably connected with the first limiting sliding grooves.

13. The injection pen according to claim 1, characterized in that: A dose spring is sleeved on the outer wall of the toggle rod, one end of the dose spring is fixedly connected to the toggle rod, and the other end of the dose spring is fixedly connected to the housing.

14. The injection pen according to claim 1, characterized in that: The shell is provided with an outer cover window, the outer wall of the toggle rod is connected to the scale cylinder, the outer wall of the scale cylinder is provided with a plurality of scales, and the outer wall of the scale cylinder corresponds to the position of the outer cover window.

15. The injection pen according to claim 14, characterized in that: The toggle rod is fixedly connected to the hollow sleeve, the outer wall of the sleeve is provided with a plurality of cylinder-sleeve connecting parts, the inner wall of the scale cylinder is provided with a plurality of engraved cylinder connecting parts for connecting with the cylinder-sleeve connecting parts, and the positions of the engraved cylinder connecting parts and the cylinder-sleeve connecting parts correspond to each other.

16. The injection pen according to claim 14, characterized in that: The outer surface of the graduated cylinder is provided with a sliding window, and the sliding window is provided with a plurality of moving windows corresponding to the outer cover windows, and the graduated cylinder is slidably connected to the sliding window.

Images