An automatically drivable injection pen

Abstract

The present application relates to the technical field of medical devices, and provides an automatically drivable injection pen, which comprises a shell, a containing cavity and a medicine cavity formed in the shell and arranged in axial direction and communicated with each other, a first limiting piece and a second limiting piece arranged in the containing cavity, an adjusting mechanism rotatably arranged in the containing cavity, the adjusting mechanism being provided with an adjusting station and an injection station in axial direction of the containing cavity, a torsion spring, two ends of the torsion spring being connected with the adjusting mechanism and the shell respectively, and an injection mechanism arranged in the containing cavity and the medicine cavity, one end of the injection mechanism being provided with a threaded rod arranged in axial direction of the containing cavity, and the other end of the injection mechanism being connected with the shell. Through improvement of the transmission mode and the spring structure, the energy storage of the torsion spring during dose adjustment is improved, not only the application scenarios can be increased during dose adjustment to cooperate with subsequent injection, especially for injection of high-viscosity medicine, but also the injection amount can be freely adjusted according to the needs of users.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to an injection pen capable of automatic driving. BACKGROUND

[0002] At present, many patients with different diseases often need to inject various drugs by themselves. In order to make the patients inject the drugs more accurately and conveniently, people have invented injection pens or various devices similar to injection pens. The main difference between the injection pen and the traditional vial and syringe is that the injection pen is easier to use for patients who are poor in flexibility, poor in eyesight and need portability for timely drug administration. The injection pen improves the patient's compliance by increasing the convenience of self-administered injection and the portability of the injection.

[0003] The injection pen is usually used for patients to repeatedly inject drugs in a relatively short period of time, especially insulin and insulin analogues (commonly known as insulin pens) for treating diabetes. The injection pen is generally composed of a cartridge, a tip connected to a needle, and a piston or plunger for injecting a dose, as well as an adjustable dial, and the injection pen can also include a click sound to confirm the dose and various motion operations.

[0004] The existing mechanical pen is only suitable for injection and dose adjustment of low-viscosity liquid medicine, and cannot inject or inject very slowly for high-viscosity medicines (such as growth hormone, ovulation hormone, etc.). In the same operation experience (the same size of force is used by people), high-viscosity liquid medicine needs more injection time in the existing mechanical pen, which makes the needle stay in the human body for too long, increases the risk of injection (the possibility of needle breakage), and reduces the user experience (the time of injection pain becomes longer). If the injection force is increased, it is difficult for a person to provide a large force continuously for a manual mechanical pen, and for an automatic mechanical pen, the spring force is increased, which reduces the reliability of the structure. There is no good solution to conveniently and efficiently inject high-viscosity liquid medicine.

[0005] Therefore, there is an urgent need for an injection device to solve the above problems. SUMMARY

[0006] The present application provides an injection pen capable of automatic driving to solve the problem that the existing mechanical pen is only suitable for low-viscosity liquid medicine adjustment and injection.

[0007] The present application provides an injection pen capable of automatic driving, comprising:

[0008] The shell is formed with a containing cavity and / or a medicine cavity arranged along the axial direction and communicating with each other, and the containing cavity is provided with a first limiting piece and a second limiting piece;

[0009] An adjusting mechanism is rotatably arranged in the accommodating cavity, and is provided with an adjusting position and an injection position along the axial direction of the accommodating cavity;

[0010] A torsion spring is connected to the adjusting mechanism and the shell at two ends respectively;

[0011] An injection mechanism is arranged in the accommodating cavity and the medicine cavity, and is provided with a threaded rod arranged along the axial direction of the accommodating cavity at one end and connected to the shell at the other end;

[0012] When the adjusting mechanism is in the adjusting position, the adjusting mechanism is in abutment with the first limiting member and is disengaged from the second limiting member, so that the torsion spring is driven to store energy by rotating the adjusting mechanism.

[0013] The automatic injection pen further comprises:

[0014] An emptying member is pivotally connected to the adjusting mechanism and is rotatably arranged on the threaded rod;

[0015] During the rotation of the adjusting mechanism, the adjusting mechanism drives the emptying member to move between the starting end and the ending end of the threaded rod.

[0016] The automatic injection pen further comprises:

[0017] The sleeve is connected to the reset tube and the torsion spring, the sleeve and the reset tube are rotatably arranged in the accommodating cavity, the knob is connected to the reset tube and is rotatably arranged on the shell, and the reset tube is pivotally connected to the emptying member; when the adjusting mechanism is in the adjusting position, the reset tube is in abutment with the first limiting member, so that the torsion spring is controlled to store energy by the knob.

[0018] The automatic injection pen further comprises:

[0019] A dial guide and a dial;

[0020] The dial guide is connected to the dial and is arranged in the accommodating cavity, the dial guide is threadedly connected to the sleeve and is pivotally connected to the shell;

[0021] The shell is provided with a display gap, and during the rotation of the adjusting mechanism, the dial guide drives the dial to move relative to the display gap.

[0022] The display gap is provided with a decorative disc, and the decorative disc is provided with a convex lens for magnifying the display value.

[0023] The shell comprises a mounting bracket, a first shell and a second shell.

[0024] The first shell and the second shell are integrally formed or detachably connected, the accommodating cavity is formed in the first shell, the medicine cavity is formed in the second shell, the mounting bracket is fixed in the accommodating cavity, and the torsion spring is connected with the mounting bracket.

[0025] The shell further comprises a cap cover, the cap cover is provided with a cavity for accommodating the second shell, and the cap cover is detachably arranged on the second shell.

[0026] The pitch of the threaded rod is less than 2.5 mm.

[0027] The first limiting piece is a first ratchet, and the second limiting piece is a threaded rod guide.

[0028] The threaded rod guide is in transmission connection with the injection mechanism, the threaded rod guide is formed with a ratchet arm, the first shell is formed with a second ratchet matched with the ratchet arm, and the ratchet arm is in abutment with the second ratchet.

[0029] When the adjusting mechanism is in the adjusting station, the adjusting mechanism is in abutment with the first ratchet, and when the adjusting mechanism is in the injection station, the adjusting mechanism is separated from the first ratchet.

[0030] The second ratchet is a bidirectional ratchet or a unidirectional ratchet.

[0031] The above technical scheme of the present application has the following beneficial effects:

[0032] The automatic driving injection pen provided by the application is provided by setting a shell, an adjusting mechanism, a torsion spring and an injection mechanism in the automatic driving injection pen. The adjusting mechanism is rotatably arranged in a containing cavity, and the adjusting mechanism is provided with an adjusting station and an injection station along the axial direction of the containing cavity; the torsion spring is connected with the adjusting mechanism and the shell at both ends; the injection mechanism is arranged in the containing cavity and a medicine cavity, and one end of the injection mechanism is formed with a threaded rod arranged along the axial direction of the containing cavity, and the other end of the injection mechanism is connected with the shell, so that the force storage size of the torsion spring can be adjusted by the adjusting mechanism, and the energy storage of the torsion spring during dose adjustment is improved through the improvement of the transmission mode and the spring structure, which not only can increase the application scene in cooperation with subsequent injection during the dose adjustment, especially for high-viscosity injection medicine, but also can freely adjust the injection amount according to the needs of the user. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the application or prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0034] Figure 1 Structure schematic view of the automatic driving injection pen provided by the embodiment of the application;

[0035] Figure 2 Structure schematic view of the automatic driving injection pen provided by the embodiment of the application;

[0036] Figure 3 Structure schematic view of the automatic driving injection pen provided by the embodiment of the application;

[0037] Figure 4 Structure schematic view of the emptying component provided by the embodiment of the application;

[0038] Figure 5 Structure schematic view of the reset tube provided by the embodiment of the application;

[0039] Figure 6 Structure schematic view of the knob provided by the embodiment of the application;

[0040] Figure 7 Structure schematic view of the sleeve provided by the embodiment of the application;

[0041] Figure 8 Structure schematic view of the button provided by the embodiment of the application;

[0042] Figure 9 Structure schematic view of the dial guide provided by the embodiment of the application;

[0043] Figure 10 Structure diagram of the dial provided for the embodiment of the present application;

[0044] Figure 11 Structure diagram of the decoration disc provided for the embodiment of the present application;

[0045] Figure 12 Structure diagram of the first housing provided for the embodiment of the present application;

[0046] Figure 13 Structure diagram of the second housing provided for the embodiment of the present application;

[0047] Figure 14 Structure diagram of the cap cover provided for the embodiment of the present application;

[0048] Figure 15 Structure diagram of the torsion spring provided for the embodiment of the present application;

[0049] Figure 16 Structure diagram of the threaded rod provided for the embodiment of the present application;

[0050] Figure 17 Structure diagram of the threaded rod guide provided for the embodiment of the present application;

[0051] Figure 18 Structure diagram of the pressing block provided for the embodiment of the present application;

[0052] Figure 19 Structure diagram of the nut provided for the embodiment of the present application;

[0053] Reference signs:

[0054] 1, housing; 11, mounting bracket; 12, first housing; 13, second housing; 14, cap cover; 15, threaded rod guide;

[0055] 2, adjustment mechanism; 21, reset tube; 22, knob; 23, sleeve; 24, button;

[0056] 3, torsion spring;

[0057] 4, injection mechanism; 41, threaded rod; 42, pressing block; 43, nut;

[0058] 5, emptying member;

[0059] 6, dial guide;

[0060] 7, dial. DETAILED DESCRIPTION

[0061] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be clearly and completely described below with reference to the drawings in the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0062] The present application will be described below with reference to the drawings. Figures 1 to 19 The present application provides an automatically driven injection pen.

[0063] As shown in the drawings, the automatically driven injection pen comprises a shell 1, an adjusting mechanism 2, a torsion spring 3 and an injection mechanism 4. Figures 1 to 3 In the embodiment, the shell 1 is formed with a containing cavity and a medicine cavity which are arranged along the axial direction of the shell 1 and are in communication with each other, the containing cavity is provided with a first limiting member and a second limiting member, the adjusting mechanism 2 is rotatably arranged in the containing cavity, the adjusting mechanism 2 is provided with an adjusting station and an injection station along the axial direction of the containing cavity, the torsion spring 3 is connected with the adjusting mechanism 2 and the shell 1 at two ends respectively, the injection mechanism 4 is arranged in the containing cavity and / or the medicine cavity, one end of the injection mechanism 4 is formed with a threaded rod 41 arranged along the axial direction of the containing cavity, the other end of the injection mechanism 4 is connected with the shell 1, in the case that the adjusting mechanism 2 is at the adjusting station, the adjusting mechanism 2 abuts against the first limiting member, the adjusting mechanism 2 is separated from the second limiting member, the injection mechanism 4 is not in transmission with the adjusting mechanism 2, so as to drive the torsion spring 3 to store energy by rotating the adjusting mechanism, in the case that the adjusting mechanism 2 is at the injection station, the adjusting mechanism 2 is separated from the first limiting member, the adjusting mechanism 2 is connected with the second limiting member, the injection mechanism 4 is in transmission with the second limiting member, the torsion spring 3 drives the adjusting mechanism 2 and the second limiting member to rotate, so as to drive the injection mechanism 4 to move along the axial direction of the medicine cavity in the process of rotation.

[0064] Specifically, the automatically driven injection pen is divided into an adjusting dose stage and an injection stage in the process of use.

[0065] In the process of the adjusting dose stage:

[0066] Firstly, the adjusting mechanism 2 is controlled to be at the adjusting station, then the adjusting mechanism 2 is controlled to rotate relative to the shell 1, since the two ends of the torsion spring 3 are connected with the adjusting mechanism 2 and the shell 1 respectively, the torsion spring 3 starts to store energy in the process of rotating the adjusting mechanism 2. At this time, the adjusting mechanism 2 abuts against the first limiting member, so that the adjusting mechanism 2 emits a "click" feedback sound when adjusting the dose, which limits the reverse rotation of the adjusting mechanism 2, thereby ensuring that the torsion spring 3 is always in the state of storing energy. At the same time, the adjusting mechanism 2 can also be reversely rotated according to the need, so as to reduce the selection of the dose.

[0067]

[0068] ​During the injection phase:

[0069] The adjustment mechanism 2 can be pressed to move along the axis of the accommodating cavity, and the adjustment mechanism 2 is disconnected from the first limiting member, while the adjustment mechanism 2 is connected with the second limiting member, at this time the torsion spring 3 drives the adjustment mechanism 2 and the second limiting member to rotate, so that the injection mechanism 4 moves along the axis of the drug cavity during the rotation.

[0070] The automatic injection pen provided by the present application is provided with a shell 1, an adjustment mechanism 2, a torsion spring 3 and an injection mechanism 4. The adjustment mechanism 2 is rotatably arranged in the accommodating cavity, and the adjustment mechanism 2 is provided with an adjustment station and an injection station along the axis of the accommodating cavity; the torsion spring 3 is connected with the adjustment mechanism 2 and the shell 1 at both ends; the injection mechanism 4 is arranged in the accommodating cavity and the drug cavity, and one end of the injection mechanism 4 is formed with a threaded rod 41 arranged along the axis of the accommodating cavity, and the other end of the injection mechanism is connected with the shell 1, so that the force storage size of the torsion spring 3 can be adjusted by the adjustment mechanism 2, and the energy storage of the torsion spring 3 during dose adjustment is improved by the improvement of the spring structure, and at the same time the injection force during injection is improved, which is suitable for larger scenes, especially for high-viscosity injection drugs. At the same time, the injection time is shortened, and the user experience is optimized.

[0071] In one embodiment, as shown in Figures 1 to 4 The automatic injection pen further comprises an emptying member 5, the emptying member 5 is pivotally connected with the adjustment mechanism 2 and is rotatably arranged on the threaded rod 41; during the rotation of the adjustment mechanism 2, the adjustment mechanism 2 drives the emptying member 5 to move between the starting end (for example, the lowermost end) and the terminal end (for example, the uppermost end) of the threaded rod 41. In the case that the adjustment mechanism 2 is in the injection station, the torsion spring 3 drives the emptying member 5 to return to the starting end of the threaded rod 41 through the adjustment mechanism 2.

[0072] Specifically, during the dose adjustment phase, by rotating the adjustment mechanism 2, the rotation and axial movement of the emptying member 5 around the thread of the threaded rod 41 can be controlled, the adjustment mechanism 2 is not connected with the injection mechanism 4, and the threaded rod 41 remains stationary. When the remaining drug amount in the second shell is less than the maximum dose, the emptying member 5 will first hit the terminal end of the threaded rod 41 when the dose is adjusted, at this time the adjusted dose is the remaining dose in the entire drug cavity, at this time the dose cannot be increased any more.

[0073] During the injection phase, the torsion spring 3 drives the adjustment mechanism 2 and the second limiting mechanism to reverse, and the threaded rod 41 reverses together, under the action of the thread of the threaded rod 41 and the adjustment mechanism 2, the emptying member 5 starts to move downward until the reversal is completed. Under the action of the thread of the shell 1, the threaded rod 41 starts to move downward, so that the entire injection mechanism 4 moves downward to press and push the drug to complete the injection.

[0074] In one embodiment, asFigure 1 、 Figure 3 、 Figure 5 、 Figure 6 、 Figure 7 and Figure 8 As shown in FIGS. 1-4, the adjustment mechanism 2 comprises a reset tube 21, a button 24, a knob 22, an elastic member and a sleeve 23.

[0075] The sleeve 23 is connected with the reset tube 21 and the torsion spring 3, the sleeve 23 and the reset tube 21 are rotatably arranged in the accommodating cavity, the knob 22 is connected with the reset tube 21, the knob 22 is rotatably arranged on the shell 1, and the reset tube 21 is pivotally connected with the emptying member 5; the button 24 is snap-connected with the reset tube 21, and the button 24 is arranged on the reset tube 21 through the elastic member, and the button 24 is movable along the axis of the accommodating cavity. When the adjustment mechanism 2 is in the adjustment position, the reset tube 21 abuts against the first limiting member, so that the torsion spring 3 is controlled to store energy through the knob 22. When the adjustment mechanism 2 is in the injection position, the reset tube 21 is disengaged from the first limiting member, and the torsion spring 3 drives the sleeve 23 and the reset tube 21 to rotate.

[0076] In the embodiment, since the sleeve 23 is connected with the reset tube 21 and the torsion spring 3, when the button 24 is not pressed, the button 24 is located at the top of the whole structure under the support of the elastic member, the reset tube 21 abuts against the first limiting member, the reset tube 21 is disengaged from the second limiting member, the injection mechanism 4 is fixed with the shell 1 through the second limiting member, and the reset tube 21 and the sleeve 23 are controlled to rotate through the rotation of the knob 22, so that the torsion spring 3 is controlled to store energy.

[0077] After the adjustment is completed, the button 24 can be pressed downward, so that the reset tube 21 moves along the axis of the accommodating cavity, at this time, the reset tube 21 is disengaged from the first limiting member, the reset tube 21 is connected with the second limiting mechanism, the injection mechanism 4 is drivingly connected with the second limiting member, and the torsion spring 3 can drive the adjustment mechanism 2 and the second limiting mechanism to rotate, so that the injection mechanism 4 is controlled to move along the axis of the medicine cavity in the process of rotation.

[0078] Based on the above embodiment, in one example, as shown in FIGS. 5-8, the automatically driven injection pen further comprises a dial guide 6 and a dial 7. Figure 1 、 Figure 2 、 Figure 3 、 Figure 9 、 Figure 10 and Figure 11 As shown in FIGS. 1-4, the adjustment mechanism 2 comprises a reset tube 21, a button 24, a knob 22, an elastic member and a sleeve 23.

[0079] The scale dial guide 6 is connected with the scale dial 7 and arranged in the accommodating cavity, the scale dial guide 6 is threadedly connected with the sleeve 23, and the scale dial guide 6 is pivotally connected with the shell 1; the shell 1 is provided with a display gap, and the scale dial guide 6 drives the scale dial 7 to move relative to the display gap in the process of rotating the adjusting mechanism. The display gap is provided with a decorative disc 8, and the decorative disc 8 is provided with a convex lens for amplifying the displayed numerical value.

[0080] In the embodiment, when the knob 22 is rotated to control the rotation of the reset tube 21 and the sleeve 23, the sleeve 23 drives the scale dial guide 6 to start rotating under the action of the thread, but the scale dial guide 6 can only move axially under the action of the spline of the shell 1 and the scale dial guide 6. The scale dial 7 moves axially synchronously under the buckle or other connection of the scale dial guide 6, so that the scale dial 7 rotates and moves axially at the same time. The continuous change of the dose can be observed from the transparent area of the decorative disc 8.

[0081] In the embodiment, as shown in Figure 1 , Figure 12 and Figure 13 , the shell 1 comprises a mounting bracket 11, a first shell 12 and a second shell 13; the first shell 12 and the second shell 13 are integrally formed or detachably connected, the first shell 12 is configured with an accommodating cavity, the second shell 13 is configured with a medicine cavity, the mounting bracket 11 is fixed in the accommodating cavity, and one end of the torsion spring 3 is connected with the mounting bracket 11. The first shell 12 is connected with the mounting bracket 11 by a buckle or other means, connected with the decorative disc 8 by adhesive, connected with the scale dial guide 6 by spline, and connected with the reset tube 21 by ratchet. The first shell 12 integrates the ratchet to limit the rotation of the reset tube 21, saves the additional ratchet element, and reduces the product cost.

[0082] In actual use, a card bottle is generally inserted into the medicine cavity of the second shell 13, the card bottle is provided with a “piston”, and the piston is pushed forward by the pressing block 42 at the top of the screw rod 41 to move forward for injection.

[0083] In the embodiment, the first shell 12 and the second shell 13 are integrally formed or detachably connected, so that the first shell 12 and the second shell 13 can be connected during use, and the first shell 12 and the second shell 13 can be separated when the medicine needs to be replaced, and the medicine is reassembled. In addition, as shown in Figure 14 , the shell 1 further comprises a pen cap 14, the pen cap 14 is configured with a cavity for accommodating the second shell, and the pen cap 14 is detachably arranged on the second shell 13.

[0084] In one example, as shown in Figure 15As shown, the wire diameter of the torsion spring 3 is greater than 0.8 mm. The energy storage of the spring during dose adjustment is improved, the injection force during injection is increased, it is suitable for larger scenarios, especially for high-viscosity injection drugs. At the same time, the injection time is shortened, and the user experience is optimized.

[0085] In one example, as shown in Figure 16 , the pitch of the threaded rod 41 is less than 2.5 mm, so that the minimum accuracy of the dose adjustment is improved, and the conventional accuracy on the market is 0.01 ml. The scheme listed in the disclosure can be not less than 0.0075 ml, suitable for larger scenarios and precision use.

[0086] Based on the above embodiments, as shown in Figure 1 , Figure 2 and Figure 17 , in an optional embodiment, the first limiting member is a first ratchet, and the second limiting member is a threaded rod guide 15; the threaded rod guide 15 is in transmission connection with the injection mechanism 4, the threaded rod guide 15 is formed with a ratchet arm, the first shell 12 is formed with a second ratchet matched with the ratchet arm, and the ratchet arm is in abutment with the second ratchet; in the case that the adjustment mechanism 2 is in the adjustment station, the adjustment mechanism 2 is in abutment with the first ratchet, and the ratchet arm is in abutment with the second ratchet; in the case that the adjustment mechanism 2 is in the injection station, the adjustment mechanism 2 is separated from the first ratchet.

[0087] When the injection pen is a repeated pen, the second ratchet can be selected as a bidirectional ratchet, at this time, after injection, the threaded rod 41 can be directly manually pushed back to the original position, and there is no need to adjust the emptying member 5 (because the emptying member 5 has returned to the bottom after injection). In addition, when the injection pen does not need to be reused, the second ratchet can be selected as a unidirectional ratchet.

[0088] In the embodiment, as shown in Figure 18 and Figure 19 , the injection mechanism 4 comprises a threaded rod 41, a pressing block 42 and a nut 43; the two ends of the nut 43 are fixed in the containing cavity and the drug cavity, or the nut 43 is arranged between the containing cavity and the drug cavity, that is, the nut 43 can be arranged outside the shell 1 or inside the shell 1 according to the needs. The nut 43 is in threaded connection with the threaded rod 41, and the pressing block 42 is connected to one end of the threaded rod 41 close to the drug cavity; in the case that the adjustment mechanism 2 is in the injection station, the threaded rod 41 is connected with the threaded rod guide 15, so that the threaded rod 41 drives the pressing block 42 to move along the axial direction of the drug cavity in the process of rotation.

[0089] It should be noted that in other embodiments, in order to increase the internal space, the nut 43 can not extend into the drug cavity 13, but be directly fixed in the first shell 12 without being connected with the second shell 13, and the second shell 13 is directly connected to the first shell 12.

[0090] In a specific embodiment, asFigures 1 to 19 The button 24 is connected with the reset tube 21 by snap or other connection, but cannot have relative axial displacement. The elastic member is installed between the button 24 and the knob 22, and ensures that the button 24 can be freely popped up after pressing the button. The knob 22 is fixed on the first housing 12, and can rotate relative to the first housing 12 but cannot have axial displacement. The knob 22 is connected with the reset tube 21 by spline.

[0091] The knob 22 adopts a large-diameter closed edge design, which is more convenient for users to hold, dose adjustment, and more ergonomic. The mounting bracket 11 is fixed on the first housing 12 and cannot rotate or have axial displacement. The emptying member 5 is connected with the threaded rod 41 by thread, and is connected with the reset tube 21 by spline. The decorative disc 8 is fixed on the first housing 12 by gluing or other means. The inside of the decorative disc 8 adopts a convex lens, which can magnify the values on the dial 7, and is more convenient for users to observe.

[0092] The sleeve 23 is connected with the reset tube 21 by spline or other means, connected with the dial guide 6 by thread, and connected with the dial 7 by spline. The dial 7 is connected with the sleeve 23 by spline, and is connected with the dial guide 6 by snap or other means. One end of the torsion spring 3 is fixed on the sleeve 23, and the other end is fixed on the mounting bracket 11. The torsion spring 3 adopts a larger wire diameter, which can increase the injection force, reduce the injection time, and be suitable for larger scenarios, such as high-viscosity drugs. The reset tube 21 is connected with the knob 22 by spline, connected with the emptying member 5 by spline, connected with the sleeve 23 by spline or other means, connected with the first housing 12 by ratchet arm, and connected with the threaded rod guide 15 by spline. The dial guide 6 is connected with the sleeve 23 by thread, connected with the first housing 12 by spline, and connected with the dial 7 by snap or other means. The dial 7 and the dial guide 6 are assembled with the sleeve, which can be assembled in advance and assembled into the shell, which is more convenient for assembly.

[0093] Threaded rod 41 is connected with emptying component 5 through thread, connected with threaded rod guide 15 through keyway, connected with nut 43 through thread, connected with pressure block 42 through buckle or other ways. Due to the increase of torsion spring 3 elasticity, threaded rod 41 can use smaller pitch, one dose rotation can adjust smaller dose, can increase the precision of injection. First shell 12 is connected with knob 22 through buckle or other ways, connected with installation support 11 through buckle or other ways, connected with decorative disc 8 through glue, connected with scale disc guide 6 through spline, connected with reset tube 21 through ratchet, connected with threaded rod guide 15 through ratchet, connected with nut 43 through buckle or other ways. Threaded rod guide 15 is connected with reset tube 21 through spline, connected with first shell 12 through ratchet arm, connected with threaded rod 41 through spline. Threaded rod guide 15 is directly connected with reset tube 21, which saves intermediate transmission parts, reduces friction, and has higher force transmission efficiency. Pressure block 42 is connected with threaded rod 41 through buckle or other ways. Nut 43 is connected with threaded rod 41 through thread, connected with first shell 12 through buckle or other ways, connected with second shell 13 through thread or other ways. Pen cap 14 is connected with second shell 13 through buckle or other ways. Second shell 13 is connected with nut 43 through thread or other ways, connected with pen cap 14 through buckle or other ways.

[0094] Adjusting dose stage:

[0095] By rotating knob 22, reset tube 21 is driven to rotate under the action of matching spline. Reset tube 21 rotates, sleeve 23 is driven to rotate under the action of matching spline. Sleeve 23 rotates, torsion spring 3 is driven to rotate, and since the other end of torsion spring 3 is fixed on installation support 11, torsion spring 3 rotates to start force storage. In the process of rotating, sleeve 23 drives scale disc guide 6 to start rotating under the action of thread, but scale disc guide 6 can only move axially under the action of spline of scale disc guide 6 and first shell 12.

[0096] The sleeve 23 rotates, and under the action of the spline, the dial 7 is rotated. The dial 7 is synchronously axially moved under the buckle or other connection of the dial guide 6, so that the dial is rotated and axially moved. The continuous change of the dose can be observed from the transparent area of the decorative disc 8. The reset tube 21 rotates, and under the connection of the first housing 12 ratchet, the reset tube 21 is limited to reverse, so that the spring is always in the force storage state. Due to the action of the ratchet, a "click" feedback sound is generated when the dose is adjusted. At the same time, under the action of the spline, the emptying component 5 starts to rotate and axially move around the threaded rod 41, and since the reset tube 21 is not connected with the threaded rod guide 15, the threaded rod 41 remains stationary. When the remaining amount in the second housing 13 is less than the maximum dose of the dial 7, the emptying component 5 will first hit the top surface of the threaded rod 41 when the dose is adjusted, at which time the dose displayed on the dial 7 is the remaining dose in the second housing 13, at which time the dose cannot be increased. The knob 22 can also be rotated in the reverse direction as needed to reduce the dose selection.

[0097] It should be noted that during the dose adjustment stage, the button 24 is kept in the pop-up state under the action of the elastic member. At the same time, the threaded rod guide 15 remains at the bottom and is not connected with the spline of the reset tube 21.

[0098] Injection stage:

[0099] Pressing the button 24 will bring the reset tube 21 down. The reset tube 21 is pressed down, the spline connection between the reset tube 21 and the knob 22 is disconnected; at the same time, the ratchet connection between the reset tube 21 and the first housing 12 is disconnected, and at the same time, the reset tube 21 is inserted into the threaded rod guide 15 due to the downward pressure, and the spline connection starts to take effect. After the reset tube 21 and the ratchet of the first housing are disconnected, the torsion spring 3 starts to reverse.

[0100] The torsion spring 3 reverses, and the sleeve 23 also starts to reverse. The sleeve 23 reverses, and under the action of the spline, the dial guide 6 is reversed, but under the action of the spline of the dial guide 6 and the first housing 12, the dial guide 6 can only move axially.

[0101] The sleeve 23 rotates, and under the action of the spline, the dial 7 is rotated. The dial 7 is synchronously axially moved under the buckle or other connection of the dial guide 6, so that the dial is rotated and axially moved. The continuous change of the dose can be observed from the transparent area of the decorative disc 8. The continuous change of the dose can be observed from the transparent area of the decorative disc 8.

[0102] Meanwhile, under the action of the spline, the reset tube 21 is reversed, and the spline connection between the reset tube 21 and the threaded rod guide 15 starts to take effect, and under the action of the spline, the threaded rod guide 15 is reversed. Under the action of the spline, the threaded rod 41 is reversed together. Under the action of the threaded rod 41 and the spline of the reset tube 21, the emptying component 5 starts to move downward until the reversal is completed. Under the action of the threads of the nut 43, the threaded rod 41 starts to move downward, thereby pushing the block 42 to move downward, and the block 42 at the top of the threaded rod 41 pushes the piston of the cartridge in the medicine cavity to move forward to perform injection.

[0103] The initial position of the emptying component 5 is at the bottom of the threaded rod 41, and when the dose is adjusted, the emptying component 5 moves upward (that is, there is displacement relative to the threaded rod 41), and when injection is performed, the emptying component moves together with the threaded rod to the bottom of the original position (that is, there is no displacement relative to the threaded rod). When the remaining amount of medicine in the second shell 13 is less than the maximum dose of the dial 7, when the dose is adjusted, the emptying component 5 will first touch the top surface of the threaded rod 41, at this time, the dose displayed on the dial 7 is the remaining dose in the second shell 13, and at this time, the dose cannot be increased.

[0104] Repeated use mode:

[0105] When the medicine in the cartridge is exhausted, the second shell 13 can be reversely screwed down, and the block 42 and the threaded rod 41 are manually pressed to reset to the most initial state, so that the injection pen can be repeatedly used.

[0106] When the injection pen is a repeated pen, only the second ratchet on the first shell 12 (which cooperates with the threaded rod guide 15) needs to be changed into a bidirectional tooth (a unidirectional tooth for a disposable pen), at this time, after injection is completed, the threaded rod 41 can be directly manually pushed back to the original position, and there is no need to adjust the emptying component (because the emptying component 5 has returned to the bottom of the original position after injection).

[0107] In summary, the automatic driving injection pen provided by the present application has the following advantages in the dose adjustment stage:

[0108] 1. Through improvement of the spring structure, for example, increasing the spring wire diameter (0.8 mm or more, and the conventional 0.6 mm), the energy storage of the spring during dose adjustment is improved, the injection force during injection is improved, the injection pen is suitable for use in larger scenarios, and is particularly suitable for injection of high-viscosity medicine. At the same time, the injection time is shortened, and the user experience is optimized.

[0109] 2. By reducing the pitch of the injection threaded rod (2.5 or less, and the conventional 3.5 mm), the minimum accuracy that can be adjusted during dose adjustment is improved. The conventional accuracy on the market is 0.01 ml, and the scheme listed in the present disclosure can be not less than 0.0075 ml, which is suitable for use in larger scenarios and higher accuracy.

[0110] 3. By increasing the dose adjustment knob, it is convex, convenient to grasp and adjust the dose, increase the user experience.

[0111] 4. The dose window uses a magnifying glass design, which helps users observe the dose or people with poor eyesight.

[0112] 5. By directly setting a bidirectional ratchet on the first shell and connecting it to the reset tube, instead of using a conventional ratchet element, the transmission efficiency and stability of the dose adjustment are higher, the product uses fewer parts, and the cost is lower.

[0113] 6. The dose display uses a combination of a dial and a dial guide, which is assembled on the sleeve, so that the first shell does not need complex processing methods, the cost is lower, and it is easier to assemble.

[0114] The automatic driving injection pen provided by the present application can be used in the injection stage:

[0115] 1. By improving the spring structure, such as increasing the spring wire diameter (0.8mm or more, conventional 0.6mm), the energy storage of the spring during dose adjustment is improved, the injection force during injection is increased, it is suitable for larger scenarios, especially for high-viscosity injection drugs. At the same time, the injection time is shortened, and the user experience is optimized.

[0116] 2. By reducing the pitch of the injection screw rod (2.5mm or less, conventional 3.5mm), the injection force can be increased, which is suitable for larger scenarios, especially for high-viscosity injection drugs.

[0117] 3. The present disclosure can provide both reusable and disposable solutions (different embodiments), and currently the market mainly uses disposable solutions.

[0118] 4. The reset tube and the screw rod guide are directly connected, which saves intermediate transmission parts, reduces friction, and makes the force transmission efficiency during injection higher and more stable.

[0119] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not limited thereto; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can modify the technical solutions described in the foregoing embodiments, or make equivalent replacements to some technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An auto- injectable pen, characterized in that, The injection device comprises: a housing, which is formed with a containing cavity and a medicine cavity arranged along the axial direction and communicated with each other, wherein a first limiting member and a second limiting member are arranged in the containing cavity; an adjusting mechanism, which comprises a reset tube, a knob and a sleeve, and is arranged in the containing cavity in a rotatable manner, wherein the adjusting mechanism is arranged along the axial direction of the containing cavity and is provided with an adjusting station and an injection station; a torsion spring, which is connected with the adjusting mechanism and the housing at two ends respectively; an injection mechanism, which is arranged in the containing cavity and / or the medicine cavity, wherein one end of the injection mechanism is formed with a threaded rod arranged along the axial direction of the containing cavity, and the other end of the injection mechanism is connected with the housing, and the pitch of the threaded rod is less than 2.5 mm; an emptying member, which is pivotally connected with the adjusting mechanism and is arranged on the threaded rod in a rotatable manner, wherein the sleeve is connected with the reset tube and the torsion spring, the sleeve and the reset tube are arranged in the containing cavity in a rotatable manner, the knob is connected with the reset tube, the knob is arranged on the housing in a rotatable manner, and the reset tube is pivotally connected with the emptying member; when the adjusting mechanism is in the adjusting station, the reset tube abuts against the first limiting member, the adjusting mechanism is separated from the second limiting member, and the torsion spring is controlled to store energy by the knob; during the rotation of the adjusting mechanism, the adjusting mechanism drives the emptying member to move between the starting end and the ending end of the threaded rod.

2. The automatically drivable injection pen according to claim 1, characterized in that: Further comprising: a dial guide and a dial; the dial guide is connected with the dial and is arranged in the containing cavity, the dial guide is threadedly connected with the sleeve and is pivotally connected with the housing; a display gap is arranged on the housing, and during the rotation of the adjusting mechanism, the dial guide drives the dial to move relative to the display gap.

3. An autoenable injective pen according to claim 2, wherein a decorative disc is arranged at the display gap, and the decorative disc is provided with a convex lens for amplifying the displayed value.

4. The automatically actuatable injection pen of claim 1, wherein, the housing comprises a mounting bracket, a first shell and a second shell; the first shell and the second shell are integrally formed or detachably connected, the containing cavity is formed in the first shell, the medicine cavity is formed in the second shell, the mounting bracket is fixed in the containing cavity, and the torsion spring is connected with the mounting bracket.

5. The automatically actuatable injection pen of claim 4, wherein, the housing further comprises a cap cover, the cap cover is formed with a cavity for accommodating the second shell, and the cap cover is detachably arranged on the second shell.

6. An autoenable injective pen according to claim 4 or 5, characterized in that the first limiting member is a first ratchet, and the second limiting member is a threaded rod guide; the threaded rod guide is drivingly connected with the injection mechanism, the threaded rod guide is formed with a ratchet arm, the first shell is formed with a second ratchet matched with the ratchet arm, and the ratchet arm abuts against the second ratchet; when the adjusting mechanism is in the adjusting station, the adjusting mechanism abuts against the first ratchet; when the adjusting mechanism is in the injection station, the adjusting mechanism is separated from the first ratchet.

7. An autoenable injective pen according to claim 6, characterized in that the second ratchet is a bidirectional ratchet or a unidirectional ratchet.

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