Injection pen

Abstract

The injection pen comprises a shell and a dose adjusting device, the dose adjusting device comprises a poke rod, the poke rod and the shell are coaxial, the poke rod can rotate relative to the shell, a plurality of poke locking grooves are formed in the inner wall of the shell in the circumferential direction, a plurality of elastic plungers which elastically deform in the radial direction are arranged on the poke rod, and the poke locking grooves are matched with the poke locking grooves. The position of the elastic plunger corresponds to the position of the shifting locking groove, and the pressing and resetting device is used for resetting the shifting rod and is connected with the shifting rod. The invention aims to provide an injection pen which can keep the working condition reliable and can realize accurate injection at the same time.

Description

Technical Field

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

[0002] An injection pen is a drug injection device, which is widely used in the treatment of chronic diseases such as diabetes and growth hormone deficiency. It is shaped like a pen and is equipped with components such as a medicine cartridge (a cartridge containing a medicine bottle for storing medicine) and an injection device. Compared with traditional syringes, injection pens are convenient to carry and significantly improve the treatment compliance of patients.

[0003] Existing injection pens, as shown in the Chinese invention patent with the application number CN201980072531.2, have the following problems: 1. Their transmission structure is too complex, involving many parts, which not only increases the difficulty of production and assembly but also increases the unreliability of transmission; 2. The overly complex transmission of components may cause wear or slipping of the transmission components after several adjustments, resulting in a deviation between the actually set dose and the desired set dose; 3. Even if the value of the actually set dose is the same as the desired set dose, the existing injection pen drives a small screw to press the medicine bottle through mechanical transmission to complete the injection of the specified dose. Due to possible wear or slipping of the mechanical transmission, the actually set dose may not be completely converted into the feed of the small screw during transmission, resulting in an error in the actually injected dose and affecting the treatment effect of patients; 4. For the convenience of operation, after completing an injection, the existing injection pen usually uses an automatic reset method to reset the dose adjustment device to the initial position where the dose can be adjusted. Due to the large number of components, it may be impossible to reset or even completely unable to reset during the reset process due to wear or slipping of the transmission components, which makes the injection pen unable to perform the next precise dose adjustment action, and the injection pen may not be used again, wasting the medicine in the injection pen and the medicine cartridge prematurely and increasing the burden on patients. Summary of the Invention

[0004] Object of the Invention: The object of the present invention is to provide an injection pen that can maintain reliable working conditions and achieve precise injection at the same time.

[0005] Technical solution: An injection pen according to the present invention includes a housing and a dose adjustment device. The dose adjustment device includes a toggle lever, which is coaxial with the housing and can rotate relative to the housing. A plurality of toggle locking grooves are provided along the circumferential direction on the inner wall of the housing. A plurality of elastic plungers that elastically deform along the radial direction are provided on the toggle lever. The positions of the elastic plungers correspond to the positions of the toggle locking grooves. It further includes a pressing and resetting device for injecting and resetting the toggle lever, and the pressing and resetting device is connected to the toggle lever. The elastic plungers are used to lock the relative position relationship between the toggle lever and the housing by using elastic force to extend into the toggle locking grooves. The elastic plungers can be in various styles, either having only one 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 one end of the toggle lever 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 for abutment.

[0007] Furthermore, a hollow adjustment knob is sleeved outside the housing. The adjustment knob abuts against one end of the housing. One end of the injection spring abuts against the button, and the other end of the injection spring abuts against the adjustment knob. The adjustment knob abuts against one end of the housing. Such a design makes the relative position of the adjustment knob and the housing in the central axis direction unchanged during injection. Therefore, in the central axis direction, the adjustment knob can be considered as a part of the housing. When the button is pressed for injection, the injection spring is compressed and stores energy. The injection spring has an elastic force upward (i.e., in the direction opposite to the pressing direction). After injection is completed, under the action of the injection spring, the button drives the toggle lever to reset, and the toggle protrusion on the toggle lever and the knob protrusion in the adjustment knob resume engagement, facilitating the adjustment of the dose for the next time.

[0008] Furthermore, a plurality of knob transmission devices are provided on the inner wall of the adjustment knob, and a plurality of toggle transmission devices for matching with the knob transmission devices are provided on the outer wall of the toggle lever. When the knob transmission device and the toggle transmission device are engaged, it is the first position (adjustment position) of the present invention. At this time, rotating the adjustment knob can drive the adjustment rod to rotate around the central axis; when injection is required, the button is pressed, and through mechanical transmission until the dial cover engages with the driving device. The engagement of the dial cover and the driving device is the second position (injection position) of the present invention.

[0009] Furthermore, the knob transmission device is a plurality of toothed inner knob protrusions, which protrude toward the inner cavity of the adjusting knob along the radial direction of the adjusting knob, and the toggle transmission device is a plurality of toothed outer toggle protrusions, which protrude outward along the radial direction of the toggle rod, and the inner knob protrusions are used to engage with the outer toggle protrusions. The inner knob protrusions and the outer toggle protrusions cooperate to have two functions: 1. After the inner knob protrusions engage with the outer toggle protrusions, the adjusting knob can drive the toggle rod to rotate during the rotation process, thereby realizing the dosage spring force accumulation; 2. After the injection starts, the toggle rod moves along the central axis toward the injection end, and the adjusting knob does not move along the central axis. The inner knob protrusions guide the outer toggle protrusions and assist 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 of the elastic plungers includes a locking member and an elastic member, and the bottom of the locking member abuts against the elastic member (such as a locking spring). The locking member can be in various styles, and can be a solid with a spherical surface such as a sphere or a hemisphere, or a solid with a regular shape such as a cube or a trapezoid, or other irregular shapes.

[0012] Furthermore, a toggle plate is provided on the toggle rod, a locking groove is provided in the toggle plate, 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 detachably provided with a dial cover at one end close to the injection end, and a plurality of dial positioning devices are provided on a 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 a side of the toggle rod close to the injection end. A plurality of driving positioning devices cooperating with the dial positioning device are provided on one end of the driving device close to the toggle rod.

[0014] Further, 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 position of the driving positioning groove.

[0015] Further, 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, it also includes a small screw, and the interior of the driving device is connected to the small screw through a spiral drive. The spiral drive means that the inner wall of the driving device is provided with a spiral guide protrusion, the outer periphery of the small screw is provided with a spiral step groove, the guide protrusion matches the spiral angle of the step groove, and the guide protrusion is slidably connected to the step groove. When the small screw rotates, the small screw is guided by the guide protrusion and moves toward the injection end along the direction of the central axis of the small screw. The small screw is used to press the piston in the cartridge bottle to achieve injection.

[0017] Furthermore, a clamping groove is provided on the small screw, and the driving device includes a screw guide sleeve and a driving sleeve, and the inner wall of the driving sleeve is provided with a clamping protrusion matched with the clamping groove, and the clamping protrusion extends into the clamping groove, and 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 through a buckle, and the clamping groove extends along the axial direction of the small screw. The clamping protrusion and the clamping groove cooperate so that the driving sleeve can drive the small screw to rotate. When injection is performed, the dial cover is engaged with the driving sleeve, and the toggle rod drives the driving sleeve to rotate. The driving sleeve drives the small screw to rotate through the clamping protrusion-clamping groove transmission, and 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 central axis of the small screw.

[0018] Furthermore, the small screw is provided with a limit tooth, and the limit tooth is connected to the small screw through a spiral drive, that is, a spiral limit protrusion is also provided inside the limit tooth, the limit protrusion matches the angle of the spiral step groove opened on the outer circumference of the small screw, and the limit protrusion is slidably connected to the step groove.

[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 slidingly connected with the first limiting sliding grooves.

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

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

[0022] Further, a dosing spring is sleeved on the outer wall of the toggle rod. One end of the dosing spring is fixedly connected to the toggle rod, and the other end of the dosing spring is fixedly connected to the housing. When the toggle rod rotates about its central axis, the dosing spring is twisted, thereby storing energy.

[0023] Further, the toggle rod is fixedly connected to a hollow sleeve. A spring positioning buckle is sleeved on the outer wall of the toggle rod. One end of the dosing spring is fixedly connected to the sleeve, and the other end of the dosing spring is fixedly connected to the spring positioning buckle. The dosing spring is a torsion spring. At this time, it can be considered that the toggle rod and the sleeve are integrated, and the spring positioning buckle is fixedly connected to the housing, and the spring positioning buckle can be considered to be integrated with the housing.

[0024] Further, an outer cover window is opened on the housing. The outer wall of the toggle rod is connected to a scale cylinder. A plurality of scales are provided on the outer wall of the scale cylinder, and the position of the outer wall of the scale cylinder corresponds to the outer cover window.

[0025] Further, the toggle rod is fixedly connected to a hollow sleeve. A plurality of sleeve connection parts are provided on the outer wall of the sleeve. A plurality of cylinder connection parts for connecting with the sleeve connection parts are provided on the inner wall of the scale cylinder, and the positions of the cylinder connection parts and the sleeve connection parts correspond to each other.

[0026] Further, the sleeve connection part is a sleeve convex block, and the cylinder connection part is an inner groove of the scale cylinder. The sleeve convex block extends into the inner groove of the scale cylinder.

[0027] Further, the sleeve connection part is a sleeve groove, and the cylinder connection part is a scale cylinder convex block. The scale cylinder convex block extends into the sleeve groove.

[0028] Further, a sliding window is sleeved outside the scale cylinder. A plurality of wandering windows for corresponding to the outer cover window are opened on the sliding window, and the scale cylinder is slidably connected to the sliding window.

[0029] Further, a spiral outer groove of the scale cylinder is provided on the outer wall of the scale cylinder, and a spiral wandering protrusion is provided on the inner wall of the sliding window. The spiral angles of the outer groove of the scale cylinder and the wandering protrusion match, and the outer groove of the scale cylinder is slidably connected to the wandering protrusion.

[0030] Further, a wandering sliding rib is provided on the outer wall of the sliding window, and an inner sliding track is opened on the inner wall of the housing. The wandering sliding rib is slidably connected to the inner sliding track of the housing. The connection between the wandering sliding rib and the inner sliding track of the housing enables the sliding window to slide only along the direction of the inner sliding track of the housing.

[0031] Further, the direction of the inner sliding track of the housing is parallel to the central axis of the housing.

[0032] Furthermore, it also includes a positioning ring sleeved on the outside of the toggle rod, 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 buckle.

[0033] Furthermore, an inner limit block is disposed 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] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages: 1. The present 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 adjustment knob, and the adjustment knob drives the toggle rod to rotate through the knob transmission device. The elastic plunger is squeezed by the shell and shrinks toward the toggle rod. Since the bottom of the elastic plunger is made of elastic parts, the wear between the elastic plunger and the shell is smaller, and the transmission is more accurate in the process of adjusting the dose, ensuring that the actual set dose is consistent with the desired 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 maintaining the relative position relationship between the toggle rod and the shell stable, ensuring the accuracy of the injection dose; 4. After the injection is completed, release the button. Under the action of the injection spring, the button drives the toggle rod to reset to the first position, and the toggle outer protrusion on the toggle rod resumes engagement with the knob inner protrusion in the adjustment knob, which is convenient for the next dose adjustment; 5. When the adjustment knob is rotated, the spring The spring positioning buckle does not rotate with the toggle rod. The sleeve rotates with the toggle rod due to its fixed connection with the toggle rod. Therefore, during the adjustment process, the dose spring is torsionally stored. After the injection starts, the button pushes the toggle rod to slide in the direction of the drive sleeve until the dial cover is engaged with the drive sleeve. The dose spring begins to release the stored energy to drive the toggle rod to rotate in the direction of releasing the stored energy, thereby driving the drive sleeve and the small screw to rotate. The small screw is thus displaced along the central axis under the guidance of the screw guide sleeve to compress the medicine bottle to inject the drug. Since the dial positioning device and the drive positioning device are in an engaged relationship, the connection relationship between the toggle rod and the drive sleeve is more accurate. Therefore, 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 rod to extend relative to the shell along the central axis, that is, the relative distance between the button and the shell along the central axis remains unchanged. Therefore, the present invention can be more convenient for patients with small palms, patients with inconvenient fingers, patients with one-handed injection needs and other patients with special needs. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0036] Figure 2 Exploded view of the first embodiment of the present invention.

[0037] Figure 3 Cross-sectional view of the first embodiment of the present invention.

[0038] Figure 4 Is Figure 3 Enlarged view at A.

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

[0040] Figure 6 Stereogram of the first toggle lever in the first embodiment of the present invention.

[0041] Figure 7 Cross-sectional view of the first toggle lever in the first embodiment of the present invention.

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

[0043] Figure 9 Top view of the housing in the first embodiment of the present invention.

[0044] Figure 10 Stereogram of the housing in the first embodiment of the present invention.

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

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

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

[0048] Figure 14 Stereogram of the first drive sleeve in the first embodiment of the present invention.

[0049] Figure 15 Combined stereogram of the small screw rod and the limit teeth in the first embodiment of the present invention.

[0050] Figure 16 Stereogram of the screw rod guide sleeve in the first embodiment of the present invention.

[0051] Figure 17 Combined cross-sectional view of the screw rod guide sleeve and the first drive sleeve in the first embodiment of the present invention.

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

[0053] Figure 19 This is a perspective view of the sliding window in the first embodiment of the present invention.

[0054] Figure 20 This is a perspective view of the graduated cylinder in the first embodiment of the present invention.

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

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

[0057] Among them: 1. Dose spring; 2. Small screw; 201. Clamping groove; 202. Screw limiting block; 3. Limiting teeth; 301. Limiting protrusion; 4. Screw guide sleeve; 5. First drive sleeve; 501. Drive positioning outer protrusion; 502. First clamping protrusion; 6. First toggle lever; 601. First dial cover; 6011. Dial positioning inner protrusion; 602. First toggle dial; 6021. First locking ball; 603. First toggle outer protrusion; 604. First limiting chute; 7. Sleeve; 701. Sleeve convex block; 702. Sleeve groove; 8. Graduated cylinder; 801. Outer groove of graduated cylinder; 802. Inner groove of graduated cylinder; 803. Graduated cylinder convex block; 9. Pen cap; 10. Medicine bin; 11. Sliding window; 1101. Wandering window; 1102. Wandering sliding rib; 1103. Wandering protrusion; 12. Positioning ring; 13. Spring positioning buckle; 14. Adjusting knob; 1401. Knob inner protrusion; 15. Button; 16. Injection spring; 17. Housing; 1701. Toggle locking groove; 1702. Inner housing limiting block; 1703. Outer cover window; 1704. Inner housing slideway; 18. Second toggle lever; 1801. Second dial cover; 18011. Dial positioning protrusion; 1802. Second toggle dial; 1803. Second toggle outer protrusion; 1804. Second limiting chute; 18021. Second locking ball; 19. Second drive sleeve; 1901. Drive positioning groove; 1902. Second clamping protrusion. Detailed implementation manners

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

[0059] Embodiment 1

[0060] Refer to the attached Figures 1 to 20 , an injection pen shown in the present invention includes a dose spring 1, a small screw 2, limiting teeth 3, a screw guide sleeve 4, a first drive sleeve 5, a first toggle lever 6, a sleeve 7, a graduated cylinder 8, a pen cap 9, a medicine bin 10, a sliding window 11, a positioning ring 12, a spring positioning buckle 13, an adjusting 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 includes a first toggle lever 6. The first toggle lever 6 is coaxial with the housing 17 and is movably connected to the housing 17 such that the first toggle lever 6 moves in an extending or retracting motion relative to the housing 17 along the central axis direction of the housing 17. A plurality of toggle locking grooves 1701 are provided on the inner wall of the housing 17 along the circumferential direction. A first toggle disk 602 is provided on the first toggle lever 6. Two locking grooves are symmetrically formed in the first toggle disk 602. An elastic plunger that elastically deforms along the radial direction is provided in each locking groove. 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] A first dial cover 601 is detachably provided at one end of the first toggle lever 6 close to the injection end. A plurality of dial positioning inner protrusions 6011 are provided on one side of the first dial cover 601 close to the injection end. The dial positioning inner protrusions 6011 protrude into the inner cavity of the first dial cover 601 along the radial direction of the first dial cover 601. A driving device is further provided on one side of the first toggle lever 6 close to the injection end. In this embodiment, the driving device includes a first driving sleeve 5 and a screw guide sleeve 4. The first driving sleeve 5, the screw guide sleeve 4 and the first toggle lever 6 are coaxial. A plurality of driving positioning outer protrusions 501 that cooperate with the dial positioning device are provided at one end of the first driving sleeve 5 close to the first toggle lever 6. The driving positioning outer protrusions 501 protrude outward along the radial direction of the first driving sleeve 5. The dial positioning inner protrusions 6011 and the driving positioning outer protrusions 501 are engaged with each other. 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, 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. A first clamping protrusion 502 that cooperates with 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 step groove is provided on the outer circumference of the small screw 2. The spiral angles of the guide protrusion and the step groove match each other. Thus, the inside of the driving device (specifically, the screw guide sleeve 4) is connected to the small screw 2 through spiral driving.

[0064] The first toggle lever 6 is fixedly connected to a hollow sleeve 7. A spring positioning buckle 13 is sleeved on the outer wall of the first toggle lever 6. A dose spring 1 is provided 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 adjustment knob 14 is arranged outside the first toggle lever 6. A number of knob inner protrusions 1401 are arranged on the inner wall of the adjustment knob 14. The knob inner protrusions 1401 protrude towards the inner cavity of the adjustment knob 14 along the radial direction of the adjustment knob 14. A number of first toggle outer protrusions 603 for matching with the knob transmission device are arranged on the outer wall of the first toggle lever 6. The first toggle outer protrusions 603 protrude outwards along the radial direction of the first toggle lever 6. The knob inner protrusions 1401 and the first toggle outer protrusions 603 are meshed with each other.

[0066] One end of the first toggle lever 6 far away from the injection end is detachably connected with a button 15. An injection spring 16 is arranged 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. Two first limiting chutes 604 for sliding connection with the limiting protrusions 301 are arranged inside the first toggle lever 6. The limiting protrusions 301 are in sliding connection with the first limiting chutes 604. The inside of the limiting tooth 3 is connected with the small screw rod 2 through screw drive, that is, spiral limiting protrusions are also arranged inside the limiting tooth 3. The angle of the spiral limiting protrusions matches with the angle of the spiral step grooves arranged on the outer periphery of the small screw rod 2. The limiting protrusions are in sliding connection with the step grooves. When adjusting the dose, the adjustment knob 14 drives the first toggle lever 6 to rotate. The first toggle lever 6 drives the limiting tooth 3 to rotate by relying on the connection drive of the limiting protrusion 301 - the first limiting chute 604. The limiting tooth 3 displaces along the central axis direction away from the injection end relative to the small screw rod 2. During injection, because the first dial cover 601 is meshed with the first drive sleeve 5, the dose spring 1 starts to release the stored energy and drives the first toggle lever 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 rod 2 in the central axis direction remains unchanged. When the next injection is needed, the adjustment knob 14 is rotated again. The limiting tooth 3 continues to displace along the central axis direction away from the injection end relative to the small screw rod 2 driven by the first toggle lever 6 until it abuts against the screw limiting block 202 arranged on the small screw rod 2. After the limiting tooth 3 abuts against the screw limiting block 202, the small screw rod 2 has no further displacement stroke relative to the injection end. Therefore, injection cannot be carried out again.

[0068] The housing 17 is provided with an outer cover window 1703. The toggle rod is fixedly connected to the hollow sleeve 7. A plurality of sleeve connecting parts are arranged on the outer wall of the sleeve 7. A plurality of barrel connecting parts for connecting with the sleeve connecting parts are arranged on the inner wall of the graduated barrel 8. The barrel connecting parts and the sleeve connecting parts are in corresponding positions. The sleeve connecting parts have both sleeve protrusions 701 and sleeve grooves 702. The barrel connecting parts have both barrel inner grooves 802 and barrel protrusions 803. The sleeve protrusions 701 extend into the barrel inner grooves 802, and the barrel protrusions 803 extend into the sleeve grooves 702. A plurality of scales are arranged on the outer wall of the graduated barrel 8. The outer wall of the graduated barrel 8 corresponds to the position of the outer cover window 1703. A sliding window 11 is sleeved outside the graduated barrel 8. A walking window 1101 corresponding to the outer cover window 1703 is opened on the sliding window 11. A spiral barrel outer groove 801 is arranged on the outer wall of the graduated barrel 8. A spiral walking protrusion 1103 is arranged on the inner wall of the sliding window 11. The spiral angles of the barrel outer groove 801 and the walking protrusion 1103 match each other, and the barrel outer groove 801 is slidably connected with the walking protrusion 1103. A walking sliding rib 1102 is arranged on the outer wall of the sliding window 11. An inner housing slideway 1704 is opened on the inner wall of the housing 17. The walking sliding rib 1102 is slidably connected with the inner housing slideway 1704. The sliding connection between the walking sliding rib 1102 and the inner housing slideway 1704 enables the sliding window 11 to slide only along the direction of the inner housing slideway 1704. The direction of the inner housing slideway 1704 is parallel to the central axis of the housing 17. A positioning ring 12 sleeved outside the toggle rod is further included. 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 adjustment knob 14. The positioning ring 12 is annular, and the positioning ring 12 is detachably connected to the housing 17 through a buckle. An inner housing limiting block 1702 is arranged on the inner wall of the housing 17. The inner housing limiting block 1702 is used to limit the sliding window 11, on the side of the sliding window 11 close to the injection end.

[0069] Embodiment 2

[0070] See the appendix Figures 21 to 22 And refer to the appendix Figures 1 to 20 As shown in the present invention, an injection pen includes a dose spring 1, a small screw 2, a limiting tooth 3, a screw guide sleeve 4, a second driving sleeve 19, a second toggle rod 18, a sleeve 7, a graduated barrel 8, a pen cap 9, a medicine cartridge 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 includes a second toggle lever 18. The second toggle lever 18 is coaxial with the housing 17 and is movably connected to the housing 17 such that the second toggle lever 18 moves in an extending or retracting motion relative to the housing 17 along the central axis direction of the housing 17. A plurality of toggle locking grooves 1701 are provided on the inner wall of the housing 17 along the circumferential direction. A second toggle disk 1802 is provided on the second toggle lever 18. Two locking grooves are symmetrically formed in the second toggle disk 1802. An elastic plunger that elastically deforms radially is provided in each locking groove. 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] A second dial cover 1801 is detachably provided at one end of the second toggle lever 18 close to the injection end. A plurality of dial positioning protrusions 18011 protruding towards the second drive sleeve 19 along the central axis direction are provided on one side of the second dial cover 1801 close to the injection end. A drive device is further provided on one side of the second toggle lever 18 close to the injection end. The drive device in this embodiment includes a second drive sleeve 19 and a screw guide sleeve 4. The second drive sleeve 19, the screw guide sleeve 4 and the second toggle lever 18 are coaxial. A plurality of drive positioning grooves 1901 that cooperate with the dial positioning device are provided at one end of the second drive sleeve 19 close to the second toggle lever 18. The dial positioning protrusion 18011 corresponds to the position of the drive positioning groove 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, and the connecting column extends into the inner cavity of the second drive sleeve 19.

[0073] A clamping groove 201 is provided on the small screw 2. A second clamping protrusion 1902 that cooperates with the clamping groove 201 is provided on the inner wall of the second drive sleeve 19. 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. A spiral step groove is provided on the outer circumference of the small screw 2. The spiral angles of the guide protrusion and the step groove match each other. Thus, the inside of the drive device (specifically, the screw guide sleeve 4) is connected to the small screw 2 through spiral drive.

[0074] The second toggle lever 18 is fixedly connected to a hollow sleeve 7. A spring positioning buckle 13 is sleeved on the outer wall of the second toggle lever 18. A dose spring 1 is provided 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 adjustment knob 14 is arranged outside the second shift lever 18. A plurality of knob inner convex blocks 1401 are arranged on the inner wall of the adjustment knob 14. The knob inner convex blocks 1401 protrude towards the inner cavity of the adjustment knob 14 along the radial direction of the adjustment knob 14. A plurality of second shift outer convex blocks 1803 for matching with the knob transmission device are arranged on the outer wall of the second shift lever 18. The second shift outer convex blocks 1803 protrude outwards along the radial direction of the second shift lever 18. The knob inner convex blocks 1401 and the second shift outer convex blocks 1803 are engaged with each other.

[0076] One end of the second shift lever 18 away from the injection end is detachably connected to the button 15. An injection spring 16 is arranged 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 limit protrusions 301 are symmetrically arranged on the outer periphery of the limit tooth 3. Two second limit chutes 1804 for slidably connecting with the limit protrusions 301 are arranged inside the second shift lever 18. The limit protrusions 301 are slidably connected with the second limit chutes 1804; the inside of the limit tooth 3 is connected to the small screw rod 2 through screw drive, that is, a spiral limit protrusion is also arranged inside the limit tooth 3, and the angle of the spiral limit protrusion matches the angle of the spiral step groove arranged on the outer periphery of the small screw rod 2. The limit protrusion is slidably connected with the step groove. When adjusting the dose, the adjustment knob 14 drives the second shift lever 18 to rotate. The second shift lever 18 drives the limit tooth 3 to rotate by relying on the connection drive of the limit protrusion 301 - the second limit chute 1804. The limit tooth 3 is displaced along the central axis direction away from the injection end relative to the small screw rod 2. During injection, because the second dial cover 1801 is engaged with the second drive sleeve 19, the dose spring 1 starts to release energy storage and drives the second shift lever 18, the second drive sleeve 19 and the limit tooth 3 to rotate synchronously. Therefore, the relative position relationship between the limit tooth 3 and the small screw rod 2 in the central axis direction remains unchanged. When the next injection is required, the adjustment knob 14 is rotated again, and the limit tooth 3 continues to be displaced along the central axis direction away from the injection end relative to the small screw rod 2 under the drive of the second shift lever 18 until it abuts against the screw rod limit block 202 arranged on the small screw rod 2. After the limit tooth 3 abuts against the screw rod limit block 202, the small screw rod 2 has no further displacement stroke relative to the injection end, so injection cannot be carried out again.

[0078] The housing 17 is provided with an outer cover window 1703. The toggle rod is fixedly connected to the hollow sleeve 7. A plurality of sleeve connection parts are arranged on the outer wall of the sleeve 7. A plurality of cylinder connection parts for connecting with the sleeve connection parts are arranged on the inner wall of the scale cylinder 8. The cylinder connection parts and the sleeve connection parts are in corresponding positions. The sleeve connection parts have both sleeve convex blocks 701 and sleeve grooves 702. The cylinder connection parts have both inner cylinder grooves 802 and cylinder convex blocks 803. The sleeve convex blocks 701 extend into the inner cylinder grooves 802, and the cylinder convex blocks 803 extend into the sleeve grooves 702. A plurality of scales are arranged on the outer wall of the scale cylinder 8. The outer wall of the scale cylinder 8 corresponds to the position of the outer cover window 1703. A sliding window 11 is sleeved outside the scale cylinder 8. A walking window 1101 corresponding to the outer cover window 1703 is opened on the sliding window 11. A spiral outer cylinder groove 801 is arranged on the outer wall of the scale cylinder 8. A spiral walking protrusion 1103 is arranged on the inner wall of the sliding window 11. The spiral angles of the outer cylinder groove 801 and the walking protrusion 1103 match. The outer cylinder groove 801 is slidably connected with the walking protrusion 1103. A walking sliding rib 1102 is arranged on the outer wall of the sliding window 11. An inner housing slideway 1704 is opened on the inner wall of the housing 17. The walking sliding rib 1102 is slidably connected with the inner housing slideway 1704. The sliding connection between the walking sliding rib 1102 and the inner housing slideway 1704 enables the sliding window 11 to slide only along the direction of the inner housing slideway 1704. The direction of the inner housing slideway 1704 is parallel to the central axis of the housing 17. A positioning ring 12 sleeved outside the toggle rod is further included. 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 housing 17 through a buckle. An inner housing limiting block 1702 is arranged on the inner wall of the housing 17. The inner housing limiting block 1702 is used to limit the sliding window 11, on the side of the sliding window 11 close to the injection end.

Claims

1. An injection pen, characterized in that: It includes a housing and a dose adjustment device. The dose adjustment device includes a toggle lever which can rotate relative to the housing. A number of toggle locking grooves are arranged along the circumferential direction on the inner wall of the housing. A number of elastic plungers which can elastically deform along the radial direction are arranged on the toggle lever. The positions of the elastic plungers correspond to the positions of the toggle locking grooves. It also includes a pressing and resetting device which is connected to the toggle lever. Each elastic plunger includes a locking part and an elastic part, and the bottom of the locking part abuts against the elastic part.

2. The injection pen according to claim 1, wherein: The pressing and resetting device includes a button and an injection spring. The button is detachably connected to one end of the toggle lever 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.

3. The injection pen according to claim 2, wherein: A hollow adjustment knob is sleeved outside the housing. The adjustment knob abuts against one end of the housing. One end of the injection spring abuts against the button, and the other end of the injection spring abuts against the adjustment knob.

4. The injection pen according to claim 3, characterized in that: A number of knob transmission devices are arranged on the inner wall of the adjustment knob. A number of toggle transmission devices for matching with the knob transmission devices are arranged on the outer wall of the toggle lever.

5. An injection pen according to claim 4, characterized in that: The knob transmission devices are a number of knob inner protrusions in a tooth shape which protrude into the inner cavity of the adjustment knob along the radial direction of the adjustment knob. The toggle transmission devices are a number of toggle outer protrusions in a tooth shape which protrude outwards along the radial direction of the toggle lever. The knob inner protrusions are used to mesh with the toggle outer protrusions.

6. The injection pen according to claim 1, characterized in that: A toggle disk is arranged on the toggle lever. A locking groove is formed inside the toggle disk. The locking part is a locking ball, and the elastic part 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.

7. The injection pen according to claim 1, wherein: A dial cover is detachably arranged at one end of the toggle lever close to the injection end. A number of dial positioning devices are arranged on one side of the dial cover close to the injection end. It also includes a driving device coaxial with the toggle lever. The driving device is located on one side of the toggle lever close to the injection end. A number of driving positioning devices for matching with the dial positioning devices are arranged at one end of the driving device close to the toggle lever.

8. An injection pen according to claim 7, characterized in that: The dial positioning device is a dial positioning protrusion protruding towards the driving device along the central axis direction. The driving positioning device is a driving positioning groove. The positions of the dial positioning protrusion and the driving positioning groove correspond to each other.

9. The injection pen according to claim 7, wherein: The dial positioning device is a dial positioning inner protrusion arranged on the inner wall of the dial cover which protrudes into the inner cavity of the dial cover along the radial direction of the dial cover. The driving positioning device is a driving positioning outer protrusion arranged on the outer wall of the driving device which protrudes outwards along the radial direction of the driving device. The dial positioning inner protrusion is used to mesh with the driving positioning outer protrusion.

10. An injection pen according to claim 7, characterized in that: The inside of the driving device is connected to a small screw through a spiral drive.

11. An injection pen according to claim 10, characterized in that: A clamping groove is arranged on the small screw, and the driving device comprises a screw guide sleeve and a driving sleeve. A clamping protrusion matching the clamping groove is arranged on the inner wall of the driving sleeve, and the clamping protrusion extends into the clamping groove. A spiral guide protrusion is arranged on the inner wall of the screw guide sleeve. A spiral stepping groove is arranged on the outer periphery of the small screw, and the guide protrusion matches the spiral angle of the stepping groove, and the guide protrusion is slidably connected to the stepping groove.

12. An injection pen according to claim 10, wherein: The small screw rod is provided with a limiting tooth, and the limiting tooth is connected to the small screw rod through a spiral drive.

13. An injection pen according to claim 12, 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 slidingly connected with the first limiting sliding grooves.

14. An 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.

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

16. An injection pen according to claim 15, 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 sleeve-tube connecting parts, the inner wall of the graduated cylinder is provided with a plurality of engraved cylinder connecting parts for connecting with the sleeve-tube connecting parts, and the engraved cylinder connecting parts correspond to the positions of the sleeve-tube connecting parts.

17. An injection pen according to claim 15, 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 wandering windows corresponding to the outer cover windows, and the graduated cylinder is slidably connected with the sliding window.

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