An automatically drivable injection device

Abstract

The application relates to the technical field of medical devices, and provides an automatically drivable injection device, which comprises a shell, a containing cavity and a medicine cavity which are arranged along the axial direction of the shell and are communicated with each other, a first limiting piece and a second limiting piece are arranged in the containing cavity, an adjusting mechanism is rotatably arranged in the containing cavity, the adjusting mechanism is provided with an adjusting station and an injection station along the axial direction of the containing cavity, a torsion spring is connected with the adjusting mechanism and the shell at two ends, and an injection mechanism is arranged in the containing cavity and the medicine cavity, one end of the injection mechanism is provided 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. Through the improvement of the transmission mode and the spring structure, the injection strength during injection is improved, the injection device is suitable for larger scenes, and is especially suitable for high-viscosity injection drugs. Meanwhile, the injection time is shortened, and the experience of a user is optimized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to an injection device 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 device 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 device capable of automatic driving, comprising:

[0008] A housing is formed with a containing cavity and a medicine cavity arranged along the axial direction and communicating with each other, and the containing cavity is provided with a first limiting member and a second limiting member;

[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 / or 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 injection position, the adjusting mechanism is disconnected from the first limiting member, connected to the second limiting member, and the injection mechanism is drivingly connected to the second limiting member, and the torsion spring drives the adjusting mechanism and the second limiting member to rotate, so that the injection mechanism moves along the axial direction of the medicine cavity in the process of rotation.

[0013] The automatic driving injection device further comprises:

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

[0015] When the adjusting mechanism is in the injection position, the torsion spring drives the emptying member to return to the starting end of the threaded rod through the adjusting mechanism.

[0016] The adjusting mechanism comprises a reset tube, a button, an elastic member and a sleeve;

[0017] The sleeve is connected to the reset tube and the torsion spring, and the sleeve and the reset tube are rotatably arranged in the accommodating cavity, the button is arranged on the reset tube through the elastic member, the button is movable along the axial direction of the accommodating cavity, and the reset tube is pivotally connected to the emptying member; when the adjusting mechanism is in the injection position, the reset tube is disconnected from the first limiting member, and the torsion spring drives the sleeve and the reset tube to rotate.

[0018] The first limiting member is a first ratchet, and the second limiting member is a threaded rod guide;

[0019] The threaded rod guide is drivingly connected to the injection mechanism, the threaded rod guide is provided with a ratchet arm, the first shell is provided with a second ratchet matched with the ratchet arm, and the ratchet arm abuts against the second ratchet;

[0020] In the case that the adjusting mechanism is in the adjusting station, the adjusting mechanism is in abutment with the first ratchet teeth; in the case that the adjusting mechanism is in the injection station, the adjusting mechanism is separated from the first ratchet teeth.

[0021] According to the automatic driving injection device provided by the application, the second ratchet teeth are bidirectional ratchet teeth or unidirectional ratchet teeth.

[0022] According to the automatic driving injection device provided by the application, the injection mechanism comprises the threaded rod, a pressing block and a nut.

[0023] The nut is fixed on the shell, the nut is in threaded connection with the threaded rod, and the pressing block is connected to one end of the threaded rod close to the medicine cavity.

[0024] In the case that the adjusting mechanism is in the injection station, the threaded rod is connected with the threaded rod guide, so that the threaded rod drives the pressing block to move along the axial direction of the medicine cavity in the process of rotation.

[0025] According to the automatic driving injection device provided by the application, the shell comprises a mounting bracket, a first shell and a second shell.

[0026] 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.

[0027] According to the automatic driving injection device provided by the application, the shell further comprises a pen cap, the pen cap is configured with a cavity for accommodating the second shell, and the pen cap is detachably arranged on the second shell.

[0028] According to the automatic driving injection device provided by the application, the pitch of the threaded rod is less than 2.5 mm.

[0029] The above technical scheme of the application has the following beneficial effects:

[0030] The application provides an automatic driving injection device, which is characterized in that a housing, an adjusting mechanism, a torsion spring and an injection mechanism are arranged in the automatic driving injection device. The adjusting mechanism is rotatably arranged in the accommodating cavity, and the adjusting mechanism is provided with an adjusting station and an injection station along the axial direction of the accommodating cavity; the torsion spring is connected with the adjusting mechanism and the housing at two ends respectively; the injection mechanism is arranged in the accommodating cavity and the medicine cavity, and one end of the injection mechanism is provided with a threaded rod arranged along the axial direction of the accommodating cavity, and the other end of the injection mechanism is connected with the housing, so that the force storage size of the torsion spring can be adjusted by the adjusting mechanism, the injection force during injection is improved by improving the transmission mode and the spring structure, the injection device is suitable for larger scenes, and is especially suitable for injection of high-viscosity medicine; meanwhile, the injection time is shortened, and the experience of the user is optimized. BRIEF DESCRIPTION OF DRAWINGS

[0031] 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 for those skilled in the art, other drawings can also be obtained without creative labor.

[0032] Figure 1 Structure schematic view of the automatic driving injection device provided by the embodiment of the application;

[0033] Figure 2 Structure schematic view of the automatic driving injection device provided by the embodiment of the application;

[0034] Figure 3 Structure schematic view of the automatic driving injection device provided by the embodiment of the application;

[0035] Figure 4 Structure schematic view of the emptying component provided by the embodiment of the application;

[0036] Figure 5 Structure schematic view of the resetting tube provided by the embodiment of the application;

[0037] Figure 6 Structure schematic view of the knob provided by the embodiment of the application;

[0038] Figure 7 Structure schematic view of the sleeve provided by the embodiment of the application;

[0039] Figure 8 Structure schematic view of the button provided by the embodiment of the application;

[0040] Figure 9 Structure schematic view of the dial guide provided by the embodiment of the application;

[0041] Figure 10 A schematic structural diagram of a dial provided in an embodiment of the present invention;

[0042] Figure 11 A schematic structural diagram of a decorative plate provided in an embodiment of the present invention;

[0043] Figure 12 A schematic structural diagram of a first housing provided in an embodiment of the present invention;

[0044] Figure 13 A schematic structural diagram of a second housing provided in an embodiment of the present invention;

[0045] Figure 14 A schematic structural diagram of a pen cap provided by an embodiment of the present invention;

[0046] Figure 15 A schematic structural diagram of a torsion spring provided in an embodiment of the present invention;

[0047] Figure 16 A schematic structural diagram of a threaded rod provided in an embodiment of the present invention;

[0048] Figure 17 A schematic structural diagram of a threaded rod guide provided in an embodiment of the present invention;

[0049] Figure 18 A schematic diagram of a briquetting block provided in an embodiment of the present invention;

[0050] Figure 19 A schematic structural diagram of a nut provided in an embodiment of the present invention;

[0051] Reference numerals:

[0052] 1. Housing; 11. Mounting bracket; 12. First housing; 13. Second housing; 14. Pen cap; 15. Threaded rod guide;

[0053] 2. Adjustment mechanism; 21. Reset tube; 22. Knob; 23. Sleeve; 24. Push button;

[0054] 3. Torsion spring;

[0055] 4. Injection mechanism; 41. Threaded rod; 42. Press block; 43. Nut;

[0056] 5. Empty the components;

[0057] 6. Dial guide;

[0058] 7. Dial. DETAILED DESCRIPTION

[0059] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0060] The following combination Figures 1 to 19 The invention provides an automatically drivable injection pen.

[0061] like Figures 1 to 3 As shown, the automatically drivable injection pen includes: a housing 1 , an adjustment mechanism 2 , a torsion spring 3 and an injection mechanism 4 .

[0062] In this embodiment, the housing 1 is formed with a receiving chamber and a medicine chamber arranged along its axial direction and interconnected, and a first limiter and a second limiter are provided in the receiving chamber. The adjustment mechanism 2 is rotatably arranged in the receiving chamber, and the adjustment mechanism 2 is provided with an adjustment position and an injection position along the axial direction of the receiving chamber; the two ends of the torsion spring 3 are respectively connected to the adjustment mechanism 2 and the housing 1; the injection mechanism 4 is arranged in the receiving chamber and / or the medicine chamber, and one end of the injection mechanism 4 is formed with a threaded rod 41 arranged along the axial direction of the receiving chamber, and the other end of the injection mechanism is connected to the housing 1; when the adjustment mechanism 2 is in the adjustment position, the adjustment mechanism 2 abuts against the first limiter, the adjustment mechanism 2 is disengaged from the second limiter, and no transmission relationship is established between the injection mechanism 4 and the adjustment mechanism 2, so that the torsion spring 3 is driven to store energy by rotating the adjustment mechanism. When the adjusting mechanism 2 is at the injection station, the adjusting mechanism 2 is disengaged from the first limiting member, the adjusting mechanism 2 is connected to the second limiting mechanism, the injection mechanism 4 is transmission-connected to the second limiting member, and the torsion spring 3 drives the adjusting mechanism 2 and the second limiting mechanism to rotate, so that the injection mechanism 4 moves axially along the medicine cavity during the rotation process.

[0063] Specifically, the use of the automatically driven injection pen is divided into a dosage adjustment stage and an injection stage.

[0064] During the titration phase:

[0065] Adjustment mechanism 2 is first positioned in the adjustment position, then rotated relative to housing 1. Since torsion spring 3, with its two ends connected to adjustment mechanism 2 and housing 1, respectively, begins to accumulate force during its rotation. At this point, adjustment mechanism 2 abuts against the first stopper, producing a "clicking" feedback sound as adjustment mechanism 2 adjusts the dose. This prevents reverse rotation of adjustment mechanism 2, ensuring that torsion spring 3 remains in a charged state. Furthermore, adjustment mechanism 2 can be rotated in the reverse direction as needed, reducing the number of doses available.

[0066] During the injection phase:

[0067] 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, and 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.

[0068] 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. Through the improvement of the spring structure, the energy storage of the torsion spring 3 during dose adjustment is improved, 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.

[0069] In one embodiment, as shown in Figures 1 to 4 The automatic injection pen further comprises an emptying member 5, which is pivotally connected with the adjustment mechanism 2 and 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. When 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.

[0070] 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, and the adjusted dose is the remaining dose in the entire drug cavity at this time, and the dose cannot be increased at this time.

[0071] 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, and 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.

[0072] In one embodiment, asFigure 1 、 Figure 3 、 Figure 5 、 Figure 6 、 Figure 7 and Figure 8 As shown in FIGS. 1-3, the adjustment mechanism 2 comprises a reset tube 21, a button 24, a knob 22, an elastic member and a sleeve 23.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] Based on the above embodiment, in one example, as shown in FIGS. 4-6, 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. 1-3, the adjustment mechanism 2 comprises a reset tube 21, a button 24, a knob 22, an elastic member and a sleeve 23.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] 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 cap cover 14, the cap cover 14 is configured with a cavity for accommodating the second shell, and the cap cover 14 is detachably arranged on the second shell 13.

[0082] 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.

[0083] 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.

[0084] 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.

[0085] 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 original position after injection). In addition, when the injection pen does not need to be reused, the second ratchet can be selected as a unidirectional ratchet.

[0086] In this 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 nut 43 is fixed on the shell 1, generally the two ends of the nut 43 can be fixed in the accommodation cavity and the drug cavity respectively, or the nut 43 is arranged between the accommodation 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.

[0087] 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.

[0088] In a specific embodiment, Figures 1 to 19 As shown, button 24 is connected to reset tube 21 via a snap or other fastening mechanism, preventing relative axial displacement. An elastic member is installed between button 24 and knob 22 to ensure that button 24 springs back freely when force is applied. Knob 22 is fixed to first housing 12 and can rotate relative to it without axial displacement. Knob 22 is connected to reset tube 21 via a spline.

[0089] The knob 22 features a large diameter with trimmed edges, making it easier for the user to grip and adjust the dosage, and also more ergonomic. The mounting bracket 11 is fixed to the first housing 12, preventing rotation and axial displacement. The evacuation member 5 is connected to the threaded rod 41 via threads and to the reset tube 21 via splines. The decorative plate 8 is secured to the first housing 12 by gluing or other means. A convex lens is incorporated into the decorative plate 8 to magnify the values ​​on the dial 7, making it easier for the user to observe.

[0090] The sleeve 23 is connected to the reset tube 21 via a spline or other means, is threadedly connected to the dial guide 6, and is splined to the dial 7. The dial 7 is splined to the sleeve 23 and is attached to the dial guide 6 via a snap or other means. One end of the torsion spring 3 is fixed to the sleeve 23 and the other end is fixed to the mounting bracket 11. The torsion spring 3 uses a larger wire diameter to increase injection force and reduce injection time, making it suitable for use in a wider range of situations, such as with high-viscosity medications. The reset tube 21 is splined to the knob 22, splined to the evacuation member 5, splined to the sleeve 23, connected to the first housing 12 via a ratchet arm, and splined to the threaded rod guide 15. The dial guide 6 is threadedly connected to the sleeve 23, splined to the first housing 12, and snapped to the dial 7 via a snap or other means. The scale plate 7 and the scale plate guide 6 are assembled together with the sleeve and can be assembled in advance before being installed into the housing, which makes assembly more convenient.

[0091] 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, which can increase the precision of injection. First shell 12 is connected with knob 22 through buckle or other ways, connected with mounting bracket 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 eliminates the intermediate transmission part, 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.

[0092] Dose adjustment stage:

[0093] 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 mounting bracket 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.

[0094] 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.

[0095] 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.

[0096] Injection stage:

[0097] 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.

[0098] 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.

[0099] 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.

[0100] Meanwhile, under the effect 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 effect of the spline, the threaded rod guide 15 is reversed. Under the effect of the spline, the threaded rod 41 is reversed together. Under the effect of the spline of the threaded rod 41 and the reset tube 21, the emptying component 5 starts to move downward until the reversal is completed. Under the effect 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.

[0101] 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 with the threaded rod to return to the original position at the bottom (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 hit 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 any more.

[0102] Repeated use mode:

[0103] 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.

[0104] 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 original position at the bottom after injection).

[0105] In summary, the automatic driving injection pen provided by the present application has the following advantages in the dose adjustment stage:

[0106] 1. Through the 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, so that the injection force during injection is improved, which is suitable for larger scenes, especially for high-viscosity injection medicine. At the same time, the injection time is shortened, and the user experience is optimized.

[0107] 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 larger scenes and higher accuracy.

[0108] 3. By enlarging the dose adjustment knob and making it convex, it is easier to grip and adjust the dose, which improves the user experience.

[0109] 4. The dosage window adopts a magnifying glass design to help users observe the dosage or people with poor eyesight to observe.

[0110] 5. By directly setting a bidirectional ratchet on the first shell to connect with the reset tube instead of using a conventional ratchet element, the transmission efficiency and use stability during dose adjustment are improved, the product uses fewer parts and the cost is lower.

[0111] 6. The dose display uses a dial and a dial guide that work together, which are assembled on the sleeve, so that the first shell does not need a complicated processing method, the cost is lower, and it is more convenient to assemble.

[0112] The automatically drivable injection pen provided by the present invention, during the injection stage:

[0113] 1. By improving the spring structure, such as increasing the spring wire diameter (over 0.8mm, compared to the conventional 0.6mm), the spring's energy storage during dose adjustment is increased, making the injection force stronger and more suitable for a wider range of use scenarios, especially for high-viscosity injectable drugs. At the same time, the injection time is shortened, optimizing the user experience.

[0114] 2. By reducing the pitch of the injection thread rod (below 2.5mm, the conventional 3.5mm), the injection force can be increased, which is suitable for use in larger scenarios, especially for high-viscosity injectable drugs.

[0115] 3. This briefing document can provide both reproducible and disposable solutions (different implementation methods). Currently, disposable solutions are the main ones on the market.

[0116] 4. The reset tube and the threaded rod guide are directly connected, eliminating the intermediate transmission parts and reducing friction, making the force transmission efficiency during injection higher and the stability higher.

[0117] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. An automatically drivable injection device, characterized in that The application relates to a pen needle device, which comprises a shell, a first limiting member and a second limiting member, an adjusting mechanism, a torsion spring, an injection mechanism and an emptying member. The adjusting mechanism comprises a reset tube, a button, an elastic member and a sleeve. The adjusting mechanism is rotatably arranged in the accommodating cavity. The injection mechanism is arranged in the accommodating cavity and / or the medicine cavity. The injection mechanism is provided with a threaded rod arranged along the axis of the accommodating cavity. The pitch of the threaded rod is less than 2.5 mm. The sleeve is connected with the reset tube and the torsion spring.

2. An autoenable injector according to claim 1, wherein, The reset tube and the sleeve are rotatably arranged in the accommodating cavity. The button is movably arranged in the accommodating cavity. The reset tube is pivotally connected with the emptying member.

3. An autoenable syringe as defined in claim 2, wherein When the adjusting mechanism is in the injection position, the reset tube is separated from the first limiting member, the adjusting mechanism is connected with the second limiting member, the injection mechanism is drivingly connected with the second limiting member, the torsion spring drives the sleeve, the reset tube and the second limiting member to rotate, so that the injection mechanism moves along the axis of the medicine cavity in the process of rotation, and the torsion spring drives the emptying member to return to the starting end of the threaded rod through the adjusting mechanism.

4. An autoenable syringe as defined in claim 2, wherein The first limiting member is a first ratchet. The second limiting member is a threaded rod guide. The threaded rod guide is drivingly connected with the injection mechanism.

5. An auto- injectable injection device according to claim 1, wherein, The threaded rod guide is provided with a ratchet arm. The shell is provided with a second ratchet matched with the ratchet arm. When the adjusting mechanism is in the adjusting position, the adjusting mechanism is in abutment with the first ratchet. When the adjusting mechanism is in the injection position, the adjusting mechanism is separated from the first ratchet. The second ratchet is a bidirectional ratchet or a unidirectional ratchet. The injection mechanism comprises the threaded rod, a pressing block and a nut. The nut is fixed on the shell and is threadedly connected with the threaded rod. When the adjusting mechanism is in the injection position, the threaded rod is connected with the threaded rod guide, so that the threaded rod drives the pressing block to move along the axis of the medicine cavity in the process of rotation. The shell 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 mounting bracket is fixed in the accommodating cavity. The torsion spring is connected with the mounting bracket.

6. An autoenable injector device according to claim 5, wherein, The shell further comprises a cap cover, a cavity for accommodating the second shell is configured in the cap cover, and the cap cover is detachably arranged on the second shell.

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