Injection mechanism capable of adjusting injection dose, and injection syringe

Abstract

An injection mechanism (1) capable of adjusting injection dose, and an injection syringe. In the injection mechanism (1), an injection push rod (80), and an injection dose adjustment assembly (1a) and a clutch control assembly (1b), which are connected to the injection push rod (80), are mounted in a housing (10); and in the injection dose adjustment assembly (1a), a tube (20) can be rotated by means of a dose adjustment knob (30) to drive a driving ring (50), such that an elastic assembly (40) generates an elastic force to drive the injection push rod (80).

Description

Injection mechanism and syringe with injection dosage adjustment function Technical Field

[0001] The present invention relates to the technical field of syringes, and in particular to an injection mechanism and a syringe with the function of adjusting injection dosage. Background Art

[0002] Under safety regulations for the injection of pharmaceutical liquids, existing syringes already have a metered injection function. This means that after a metered syringe is assembled into a vial, pressing the push rod at the rear end of the syringe, in conjunction with the drive mechanism within the syringe, pushes the piston in the vial a certain distance, thereby delivering a specific dose of the pharmaceutical liquid through the needle connected to the front end of the vial.

[0003] Among existing metered-dose syringes, some syringes' injection mechanisms utilize a dosage control mechanism design. After the injection mechanism is connected to the medicine bottle, it can control the dosage of each injection and lock after a certain number of reuses, thereby prompting the syringe to be discarded in its entirety, ensuring the safety of the injection pen.

[0004] Although the aforementioned conventional metered syringes can provide a fixed dose of liquid medicine, the use of the syringes usually requires adjustment of the injection dose according to the needs of different injection subjects. Due to the lack of the function of adjusting the injection dose, conventional metered syringes are difficult to meet the needs of different users.

[0005] To address the aforementioned issue of inability to adjust the injection dose, some existing metered-dose syringes utilize an adjustable injection mechanism to accommodate the varying dosage requirements of different users. This injection mechanism utilizes a vial connector assembly to connect to a vial, and an adjustable pusher assembly mounted within the vial connector assembly and extending into the vial. A knob on the vial connector assembly drives a pusher rod of the adjustable pusher rod rearward to a predetermined scale. During injection, pressing the pusher rod causes the vial to dispense a predetermined dose of liquid medication, allowing the syringe to adjust the injection dose based on the needs of different recipients.

[0006] While the aforementioned syringes have an injection mechanism with adjustable dosage that can be connected to a vial containing a liquid medication, allowing the user to adjust the dosage according to a physician's prescription before administering the injection, the injection mechanism of such syringes, however, requires the user to depress the injection plunger throughout the injection process, which is laborious to operate. Furthermore, the injection mechanism must be manually reset upon re-injection, making it inconvenient to use.

[0007] Summary of the Invention

[0008] The technical problem to be solved by the present invention is to provide an injection mechanism and syringe with an adjustable injection dose function. This solves the problem that some injection mechanisms of existing syringes can only provide a quantitative injection function for multiple injections of the same dose, and cannot adapt to the different injection dose requirements of different injection subjects and adjust the injection dose according to the doctor's prescription. Some injection mechanisms can only adjust the injection dose, but are more laborious and inconvenient to use.

[0009] The technical solution proposed by the present invention is to provide an injection mechanism with the function of adjusting the injection dose, which can be assembled with a medicine bottle, and the injection mechanism includes:

[0010] a hollow shell;

[0011] an injection push rod, which is mounted in the housing and can be driven to move forward along the axial direction to perform an injection action on the medicine bottle;

[0012] An injection dose adjustment assembly, which can be connected to the injection plunger and includes:

[0013] a tube, which is installed in the housing so as to be rotatable and movable forward and backward, and the injection plunger is located in the tube;

[0014] a dose adjustment knob rotatably assembled at the rear end of the housing and detachably connected to the tube; when the dose adjustment knob is connected to the tube, the dose adjustment knob can rotate the tube;

[0015] a drive ring installed in the tube and threadedly connected to the injection push rod;

[0016] an elastic component disposed within the tube, the elastic component being located between the drive ring and the tube and capable of providing elastic force to connect the tube to the dose adjustment knob, and when the dose adjustment knob rotates the tube, the elastic component is acted upon by the drive ring to generate elastic potential energy; and

[0017] a pressing member mounted at the rear end of the dose adjustment knob, the pressing member being capable of triggering the tube to separate from the dose adjustment knob, causing the elastic component to release the elastic force to push the drive ring to drive the injection plunger to spirally move forward; and

[0018] A clutch control assembly is installed inside the front end of the housing and can limit the injection push rod when the dose adjustment knob rotates the tube. When the tube is triggered to disengage from the dose adjustment knob, the clutch control assembly can connect to the tube. After the injection push rod completes the injection action, the elastic assembly drives the tube to disengage from the clutch control assembly and reset.

[0019] Another technical solution proposed by the present invention is to provide a syringe with an injection dosage adjustment function, which includes: an injection mechanism with an injection dosage adjustment function as described above, and a medicine bottle sleeve, which can be sleeved on the outside of the medicine bottle and assembled to the front end of the shell.

[0020] The present invention utilizes the aforementioned injection mechanism and the syringe including the injection mechanism as an integral structure. When the syringe is assembled with a medicine bottle and an injection action is performed, it has at least the following beneficial effects:

[0021] 1. Possessing the function of adjusting the injection dose: The injection mechanism utilizes an injection dose adjustment assembly provided in the housing to connect to the injection push rod. By rotating the dose adjustment knob on the tube, the tube drives the drive ring to move, causing the elastic assembly to generate elastic potential energy. When the pressing member triggers the tube to disengage from the dose adjustment knob, the elastic assembly releases the elastic potential energy and pushes the drive ring to drive the injection push rod to spirally move forward, so that the injection mechanism has the function of adjusting the injection dose.

[0022] 2. Reusable: The injection mechanism utilizes a clutch control assembly installed inside the front end of the housing. When the dose adjustment knob rotates the tube, the clutch control assembly can limit the injection push rod; when the tube is triggered to disengage from the dose adjustment knob, the clutch control assembly can connect to the tube. After the injection push rod completes the injection action, the elastic assembly drives the tube to disengage from the clutch control assembly and reset. In this way, the injection mechanism can adjust the injection dose and perform the injection action repeatedly.

[0023] 3. Effortless and simple operation: As mentioned above, the injection mechanism utilizes an injection dose adjustment assembly provided in the housing to connect to the injection push rod. The dose adjustment knob rotates the tube, and the tube drives the drive ring to move, thereby generating elastic potential energy in the elastic assembly. When the pressing member triggers the tube to disengage from the dose adjustment knob, the injection mechanism utilizes the elastic potential energy released by the elastic assembly to drive the injection push rod to spirally move forward via the drive ring, thereby achieving the technical effect of labor-saving and simple operation.

[0024] The injection mechanism and syringe of the present invention can further provide the function of precisely adjusting the injection dose. The outer shell has a scale window, and the outer circumference of the tube is provided with multiple dose scales arranged in a circular pattern. When the dose adjustment knob is connected to the tube, the knob can rotate any dose scale on the tube to move it to the scale window. When the knob rotates the dose scale on the tube to move it to the scale window, the elastic component, under the action of the drive ring, generates the elastic potential energy corresponding to the dose scale, and the clutch control component restrains the injection plunger. Thus, the injection mechanism and syringe enable the user to precisely adjust the injection dose according to the doctor's prescription.

[0025] The injection mechanism and syringe of the present invention can further provide a locking function, wherein, in the injection mechanism, the outer peripheral surface of the injection push rod is provided with a forward spiral guide groove and a reverse spiral guide groove, and the rear end of the injection push rod located behind the drive ring has a stop portion, and a forward spiral portion is formed in the drive ring, which is threadedly engaged with the forward spiral guide groove; the clutch control assembly includes a connecting component and a clutch control ring arranged in the connecting component, a reverse spiral portion is formed in the clutch control ring, and the reverse spiral portion is threadedly engaged with the reverse spiral guide groove of the injection push rod, and the clutch control ring can be relatively clutched with the operated pipe; the connecting component can limit the clutch control ring to be driven to rotate in the reverse direction at a fixed point, and the connecting component has a forward threaded portion, which is threadedly engaged with the forward spiral guide groove of the injection push rod. With this structure, when the medicine liquid in the medicine bottle of the injection mechanism is used up, the stop part at the rear end of the injection push rod is located behind the drive ring for limiting; or when the medicine liquid remaining in the medicine bottle is less than the predetermined injection dose, the distance between the stop part at the rear end of the injection push rod and the abutment ring on the rear side of the drive ring is less than the movement stroke of the predetermined injection dose, when the user rotates the dose adjustment knob to rotate the tube to drive the drive ring to be limited by the stop part at the rear end of the injection push rod, the user can no longer rotate the dose adjustment knob to turn the tube to a larger injection dose position, and it is in a locked state. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] FIG1 is a plan view of an injection mechanism with a function of adjusting the injection dosage according to an embodiment of the present invention, connected to a medicine bottle.

[0027] FIG2 is a perspective exploded schematic diagram of the injection mechanism embodiment shown in FIG1 .

[0028] FIG3 is a perspective exploded schematic diagram of the injection mechanism embodiment shown in FIG1 from another perspective.

[0029] FIG4 is a perspective cross-sectional view of the housing in the embodiment of the injection mechanism shown in FIG2 and FIG3 .

[0030] FIG5 is a perspective cross-sectional view of the tube in the embodiment of the injection mechanism shown in FIG2 and FIG3.

[0031] FIG6 is a perspective cross-sectional view of the dose adjustment knob in the injection mechanism embodiment shown in FIG2 and FIG3.

[0032] 7 and 8 are schematic three-dimensional cross-sectional views of the drive ring in the injection mechanism embodiment shown in FIG. 2 and FIG. 3 , respectively, from different viewing angles.

[0033] 9 and 10 are schematic 3D cross-sectional views of the clutch control ring in the injection mechanism embodiment shown in FIG. 2 and FIG. 3 , respectively.

[0034] FIG11 is a perspective cross-sectional view of the connecting component in the embodiment of the injection mechanism shown in FIG2 and FIG3.

[0035] FIG12 is a perspective schematic diagram (I) of the injection mechanism embodiment shown in FIG2 and FIG3 after some components are assembled.

[0036] FIG13 is a perspective schematic diagram (II) of the injection mechanism embodiment shown in FIG2 and FIG3 after some components are assembled.

[0037] FIG. 14 is a cross-sectional view of the injection mechanism of the assembled medicine bottle shown in FIG. 1 taken along the cutting line AA.

[0038] FIG. 15 is a cross-sectional view of the injection mechanism of the assembled medicine bottle shown in FIG. 1 taken along the cutting line BB.

[0039] FIG. 16 is a schematic cross-sectional view of the injection mechanism of the assembled medicine bottle shown in FIG. 1 at the position of the cutting line CC.

[0040] FIG. 17 is a cross-sectional view of the injection mechanism of the assembled medicine bottle shown in FIG. 1 at the position of the cutting line DD.

[0041] FIG. 18 is a perspective view of an embodiment of a syringe having a function of adjusting injection dosage according to the present invention.

[0042] FIG. 19 is a partially exploded perspective view of the syringe embodiment shown in FIG. 18 .

[0043] FIG. 20 is a reference diagram (I) of the syringe embodiment shown in FIG. 18 to FIG. 19 in use.

[0044] FIG. 21 is a reference diagram (II) of the syringe embodiment shown in FIG. 18 to FIG. 19 in use.

[0045] FIG. 22 is a reference diagram (III) of the syringe embodiment shown in FIG. 18 to FIG. 19 in use state.

[0046] FIG23 is a reference diagram (four) of the syringe embodiment shown in FIG18 to FIG19 in use state.

[0047] FIG24 is a cross-sectional schematic diagram (I) of the syringe embodiment shown in FIG18 to FIG19 in use.

[0048] FIG25 is a partial perspective schematic diagram of the syringe embodiment shown in FIG24.

[0049] FIG26 is a schematic cross-sectional view (II) of the syringe embodiment shown in FIG18 to FIG19 in use.

[0050] FIG27 is a schematic cross-sectional view (III) of the syringe embodiment shown in FIG18 to FIG19 in use.

[0051] FIG28 is a partial perspective schematic diagram of the syringe embodiment shown in FIG26 and FIG27.

[0052] FIG29 is a schematic cross-sectional view (IV) of the syringe embodiment shown in FIG18 to FIG19 in use.

[0053] FIG30 is a cross-sectional schematic diagram (V) of the syringe embodiment shown in FIG18 to FIG19 in use.

[0054] Brief description of the figures: 1: injection mechanism L: central axis E1: front end E2: rear end F: forward 1a: injection dose adjustment component 1b: clutch control component 10: housing 11: housing wall 12: accommodating space 13: scale window 14: front end connection part 141: ring groove 142: groove 143: axial guide groove 144: buckle groove 15: rear end connection part 151: front limit stop part 152: rear limit stop part 16: housing wall meshing teeth 20: pipe 200: assembly space 21: dose scale marking group 211: exhaust icon 22: latching tooth part 23: guide block 24: alignment latch groove 25: moving guide groove 26: abutment part 27: front limit part 28: rear limit part 30: dose adjustment knob 300: assembly space 31: inner ring plate 32: clutch Engaging tooth 40: Elastic component 41: Abutment ring 411: Abutment portion 50: Drive ring 51: Forward spiral portion 52: Axial guide portion 53: Flange 60: Clutch control ring 61: Reverse spiral portion 62: Elastic buckle 63: Alignment tooth 70: Connecting component 700: Active space 71: Forward screw connection portion 72: Connecting rail 73: Buckle block 74: Single oblique ratchet 80: Injection push rod 801: Forward spiral guide groove 802: Reverse spiral guide groove 803: Front end 804: Stopper 81: Piston abutment 90: Pressing member 2: Medicine bottle 2A: Piston 3: Medicine bottle sleeve 31: Needle connection end 32: Assembly end 33: Medicine bottle window 4: Protective cover 5: Needle 6: Needle shield assembly 6A: Needle shield 6B: Needle cover DETAILED DESCRIPTION

[0055] The following is a detailed description of the technical means used by the present invention to achieve the intended purpose with reference to the accompanying drawings and embodiments of the present invention.

[0056] The technical solution of the present invention includes an injection mechanism with an adjustable injection dosage function, and a syringe with an adjustable injection dosage function, the syringe including the injection mechanism. The specific components and structures of the injection mechanism and syringe of the present invention are described below in conjunction with the accompanying drawings and embodiments.

[0057] As shown in Figure 1, an embodiment of an injection mechanism 1 with adjustable injection dosage is disclosed. The front end of the injection mechanism 1 can be directly or indirectly assembled with a medicine vial 2, and a needle 5 is mounted on the front end of the vial 2, forming a syringe capable of injecting a liquid medication. The vial 2 contains a liquid medication and a piston. The needle 5 penetrates the vial's front end plug and extends into the vial. When the piston in the vial 2 is pushed by the injection mechanism 1, the liquid medication in the vial 2 is discharged through the needle 5, thereby performing an injection.

[0058] In order to facilitate the description of the embodiment of the injection mechanism 1 of the present invention, the directions are first defined. As shown in Figure 1, the injection mechanism 1 is defined as having a central axis L, with the direction of the central axis L as the axial direction, and the direction perpendicular to the central axis L as the radial direction. The injection mechanism 1 is defined as having one end along the central axis L for assembling the medicine bottle as its front end E1, and the other end opposite to it as its rear end E2. The viewing angle direction viewed from the rear end E2 is the clockwise rotation direction relative to the central axis L as the positive direction F, and conversely, the counterclockwise rotation direction is the reverse direction.

[0059] As shown in Figures 2 and 3, the injection mechanism 1 includes a housing 10, an injection plunger 80, an injection dose adjustment assembly 1a, and a clutch control assembly 1b. The specific structures of these are described in detail below.

[0060] As shown in Figures 2, 3 and 4, the housing 10 includes a housing wall 11 and an accommodating space 12 located in the housing wall 11 and extending along the central axis. The housing 10 is provided with a scale window 13 radially connected from the outer circumference of the housing wall 11 to the accommodating space 12.

[0061] In the embodiment shown in Figures 2, 3 and 4, the front end of the shell 10 is a front connecting portion 14 for connecting to the rear end of the medicine bottle 2, and the rear end of the shell 10 is a rear connecting portion 15 for connecting to the injection dose adjustment component 1a.

[0062] In the embodiment shown in Figures 2, 3, and 4, the front connecting portion 14 of the housing 10 has a plurality of annular grooves 141 formed on the inner circumference of the housing wall 11, spaced apart in a front-to-back arrangement, as well as a plurality of grooves 142 parallel to the central axis, and a plurality of engaging grooves 144. The rear connecting portion 15 has one or more rear stoppers 152 located on the outer circumference of the housing wall 11, and a front stopper 151 spaced apart in front of the rear stoppers 152. The rear connecting portion 15 forms a plurality of housing wall engaging teeth 16 arranged in an equiangular annular pattern on the inner circumference of the housing wall 11. The housing 10 also has at least one axial guide groove 143 formed on the inner circumference of the housing wall 11, extending rearward from the front end.

[0063] As shown in Figures 2, 3, and 12-14, the injection plunger 80 is mounted within the housing 10 and can be driven forward along the central axis. The injection plunger 80 can directly drive the piston 2A in the vial 2 to perform an injection, or it can engage a piston abutment 81 at the front end 803 of the injection plunger 80 to drive the piston 2A in the vial 2 to perform an injection. In this embodiment, the outer circumference of the injection plunger 80 includes a forward spiral guide groove 801 and a reverse spiral guide groove 802. The pitches of the forward and reverse spiral guide grooves 801 and 802 are equal. The pitches of the forward and reverse spiral guide grooves 801, 802, and the length of the injection plunger 80 are set in conjunction with the injection dose adjustment assembly 1a based on the injection dose delivered when the injection plunger 80 is applied to the vial. The rear end of the injection plunger 80 has a stop 804 to provide a limit stop. In this embodiment, the pitch of the forward spiral guide groove 801 is equal to that of the reverse spiral guide groove 802. However, in other embodiments, the pitch of the forward spiral guide groove 801 and that of the reverse spiral guide groove 802 may be unequal to accommodate speed adjustment requirements or other requirements, and this is not limited here.

[0064] As shown in Figures 2, 3 and 14, the injection dose adjustment assembly 1a is installed in the housing 10 and is connected to the injection push rod 80. The front end of the injection push rod 80 extends outside the front end of the injection dose adjustment assembly 1a. The injection dose adjustment assembly can be manually adjusted to a plurality of injection dose values ​​of varying sizes to generate corresponding elastic potential energy. When the injection dose adjustment assembly is triggered, the elastic potential energy of varying sizes drives the injection push rod 80 to generate a movement stroke of varying lengths, so that the injection push rod 80 drives the medicine bottle to perform an injection action of varying injection doses.

[0065] As shown in FIG. 2 , FIG. 3 and FIG. 14 , the injection dose adjustment assembly 1 a includes a tube 20 , a dose adjustment knob 30 , a drive ring 50 , an elastic assembly 40 and a pressing member 90 .

[0066] As shown in Figures 2, 3, 5, 14, and 15, the tube 20 is mounted within the housing 12 of the housing 10 so as to be rotatable and movable forward and backward along the central axis. The outer circumference of the tube 20 includes a set of dosage scale markings 21. The dosage scale markings 21 have multiple dosage scales, each of which is set based on commonly used injection dosages prescribed by a physician or a specific injection dosage prescribed by a physician. In this embodiment, the dosage scale markings 21 include multiple dosage scales such as "0-(mg)", "0.25-(mg)", "0.5-(mg)", "0.75-(mg)", and "1.0-(mg)". These multiple dosage scale markings are arranged in a circular pattern at predetermined locations on the outer circumference of the tube 20. However, this is not a limitation.

[0067] The dosage scale marking group 21 may further include a venting icon 211, which is represented by a "--- -" icon in this embodiment. The "--- -" icon is adjacent to the "-0-(mg)" scale position and serves as an indication for executing bottle venting. The dosage scale of the dosage scale marking group 21 and the venting icon 211 can be selectively revealed in the scale window 13 of the housing 10 as the tube 20 rotates.

[0068] The interior of the tube fitting 20 has an assembly space 200, and the inner circumference of the front end of the tube fitting 20 forms a plurality of alignment grooves 24 extending from front to rear and at least one movable guide groove 25. The rear section of the assembly space 200 of the tube fitting 20 forms at least one abutment portion 26. The outer circumference of the rear end of the tube fitting 20 is provided with a plurality of tooth portions 22 extending convexly backward along the central axis direction, and at least one guide block 23 located in front of the tooth portions 22 and protruding radially. The guide block 23 can engage with the inner shell wall meshing teeth 16 of the rear end of the shell 10, and the injection push rod 80 extends into the assembly space 200 of the tube fitting 20.

[0069] The outer circumference of the front section of the tube 20 forms a front limit portion 27, and the outer circumference of the rear section of the tube 20 forms a rear limit portion 28. The rear limit portion 28 is located between the dosage scale mark group 21 and the guide block 23 to limit the range of forward and backward movement of the tube 20 along the central axis.

[0070] As shown in Figures 2, 3, 6, and 14, the dose adjustment knob 30 is rotatably mounted on the rear connection portion 15 of the housing 10 and is connected to the tube 20. The dose adjustment knob 30 can drive the tube 20 to rotate until one of the dose scales or the exhaust icon 211 in the dose scale marking set 21 is positioned within the scale window 13 of the housing 10. The dose adjustment knob 30 defines a connection space 300. An inner ring plate 31 is disposed at the rear end of the connection space 300, and a plurality of clutch teeth 32 are arranged on the front side of the inner ring plate 31. The clutch teeth 32 of the dose adjustment knob 30 can engage with the latching teeth 22 at the rear end of the tube 20, and forward movement of the tube 20 can disengage the clutch teeth 32 from the latching teeth 22.

[0071] As shown in Figures 2, 3, 7, 8 and 14, the drive ring 50 is installed in the assembly space 200 of the pipe 20 and can be screwed on the injection push rod 80. In this embodiment, a positive spiral portion 51 is formed in the drive ring 50, and the positive spiral portion 51 is screwed into engagement with the positive spiral guide groove 801 of the injection push rod 80. The outer peripheral surface of the drive ring 50 is provided with at least one axial guide portion 52, and the axial guide portion 52 is located in the moving guide groove 25 of the pipe 20, so that the drive ring 50 can move back and forth along the central axis direction in the pipe 20. The drive ring 50 can rotate together with the pipe 20 on the outside of the injection push rod 80.

[0072] As shown in Figures 2, 3, and 14, the elastic component 40 is installed within the assembly space 200 of the tube 20 and can be operated to generate elastic potential energy. In this embodiment, the elastic component 40 is a compression spring. The elastic component 40 is sleeved on the outside of the injection plunger 80 and preloaded between the drive ring 50 and the abutment portion 26 within the assembly space 200 of the tube 20. The preloaded elastic force of the elastic component 40 generates a rearward thrust force on the tube 20, thereby connecting the tube 20 to the dose adjustment knob 30.

[0073] As shown in Figures 2, 3, 7, 8, and 14, the rear end of the elastic component 40 abuts the abutment portion 26 within the tube 20. The front end of the elastic component 40 may be equipped with an abutment ring 41. The injection push rod 80 passes through the abutment ring 41, and the abutment ring 41 can move on the injection push rod 80. The elastic component 40 is connected to the drive ring 50 through the abutment ring 41. The outer peripheral surface of the abutment ring 41 has an abutment portion 411, which provides a contact area for the front end of the elastic component 40. The rear end of the drive ring 50 may also be formed with one or more flanges 53, which are pivotally mounted within the abutment ring 41 via the flanges 53, so that the drive ring 50 contacts the front end of the abutment ring 41 and can rotate.

[0074] As shown in Figures 2, 3, 12 and 14, the pressing member 90 is provided at the rear end of the housing 10 and is mounted on the rear end of the dose adjustment knob 30 so as to be movable forward and backward. The pressing member 90 can be pressed forward to push the tube 20 forward, causing the tooth portion 22 of the tube 20 to disengage the clutch tooth 32 of the dose adjustment knob 30.

[0075] As shown in Figures 2, 3, 9 to 11, and 14, the clutch control assembly 1b is mounted within the front of the housing 10 and located in front of the tube 20 and the drive ring 50. The clutch control assembly 1b can engage and disengage with the tube 20 and, when the dose adjustment knob 30 rotates a dose scale on the tube 20 to move to the scale window 13, position the injection plunger 80. Furthermore, when the tube 20 is released from the dose adjustment knob 30, the clutch control assembly 1b connects to the tube 20. After the injection plunger 80 completes the injection, the elastic element 40 drives the tube 20 to release the clutch control assembly 1b and return it to its original position. In this embodiment, the clutch control assembly 1b includes a clutch control ring 60 and a connecting component 70.

[0076] As shown in Figures 2, 3, 9 to 10, and 14, the clutch control ring 60 is mounted on the front side of the pipe 20 and the drive ring 50. The clutch control ring 60 can engage and disengage with the operated pipe 20. A reverse spiral portion 61 is formed in the clutch control ring 60, and the reverse spiral portion 61 is a spiral portion of opposite rotation to the forward spiral portion 51 of the drive ring 50. The injection plunger 80 is threadedly mounted within the clutch control ring 60, and the reverse spiral portion 61 is threadedly engaged with the reverse spiral guide groove 802 of the injection plunger 80. The outer circumference of the clutch control ring 60 is formed with a plurality of alignment teeth 63 and a plurality of elastic buckles 62. The alignment teeth of the clutch control ring 60 can engage with the alignment groove 24 within the front end of the pipe 20, allowing the clutch control ring 60 and the pipe 20 to rotate together.

[0077] As shown in Figures 2, 3, 11, and 14, the connecting component 70 is installed within the front connecting portion 14 of the housing 10 and is located in front of the tube 20. The front stopper 27 and the rear stopper 28 of the tube 20 are located between the connecting component 70 and the rear end of the housing 10. The connecting component 70 has a central hole and a movable space 700 located behind the central hole. A positive threaded portion 71 is formed in the central hole. The injection push rod 80 is threadedly mounted in the connecting component 70. A piston abutment 81 provided at the front end of the injection push rod 80 is located in front of the connecting component 70. The positive threaded portion 71 is threadedly engaged with a positive spiral guide groove 801 of the injection push rod 80. The connecting component 70 forms a plurality of single oblique ratchet teeth 74 in a circular arrangement on the inner circumference of the movable space 700. The front end of the clutch control ring 60 is pivotally disposed in the movable space 700 of the connecting component 70. The elastic buckle 62 of the clutch control ring 60 can be buckled in the single oblique ratchet teeth 74, and limits the clutch control ring 60 to being driven to rotate in the reverse direction at a fixed point.

[0078] As shown in Figures 2, 3, 11, 14 and 17, the outer peripheral surface of the connecting component 70 is provided with at least one connecting rail 72 and a plurality of snap blocks 73. The connecting component 70 is installed in the front end connecting portion 14 of the shell 10. The connecting rail 72 is aligned with the axial guide groove 143 of the shell 10, and the snap blocks 73 are snapped into the snap groove 144 of the shell 10, so that the connecting component 70 is fixed in the shell 10.

[0079] As shown in Figures 18 and 19, an embodiment of the syringe with the function of adjusting the injection dosage of the present invention is disclosed. As can be seen from the drawings, the syringe includes an injection mechanism 1 and a medicine bottle sleeve 3. The specific composition and structure of the injection mechanism 1 are as described above and will not be repeated here.

[0080] As shown in Figure 19, the medicine bottle sleeve 3 is sleeved on the outside of the medicine bottle 3, and the medicine bottle 3 is assisted by the medicine bottle sleeve 3 to be assembled to the front end of the shell 10 of the injection mechanism 1. The piston push member 81 assembled at the front end of the injection push rod 80 extends into the medicine bottle 2 and abuts against the rear end of the piston 2A. The front end of the medicine bottle sleeve 3 can be detachably connected to the needle 5, and the needle 5 extends into the medicine bottle 2 through the front end of the medicine bottle sleeve 3.

[0081] As shown in Figures 19, 14 and 4, the rear end of the medicine bottle sleeve 3 has a connecting end 32, and the shape of the outer circumference of the connecting end 32 matches the shape of the inner circumference of the front end connecting portion 14 of the outer shell 10 on the shell wall 11, that is, the connecting end 32 of the medicine bottle sleeve 3 has an annular protrusion corresponding to the annular groove 141 of the front end connecting portion 14 and a strip protrusion corresponding to the groove 142, so that the connecting end 32 of the rear end of the medicine bottle sleeve 3 can be disassembled and installed in the front end connecting portion 14 of the outer shell 10, and the connecting end 32 of the rear end of the medicine bottle sleeve 3 after assembly can be firmly positioned in the front end connecting portion 14 of the outer shell 10.

[0082] As shown in FIG19 , the front end of the vial sleeve 3 has a needle connection end 31, to which the needle 5 is detachably mounted. The needle 5 can pass through the front end of the vial sleeve 3 and penetrate into the vial 2. The peripheral wall of the vial sleeve 3 may also be formed with one or more vial windows 33, allowing the user to directly view the state of the liquid medicine in the vial 2 through the vial windows 33.

[0083] As shown in Figure 19, a protective cap 4 can be mounted on the outer side of the vial sleeve 3. The rear end assembly end 32 of the vial sleeve 3 extends beyond the rear end of the protective cap 4, providing protection for the vial sleeve 3 and the vial 3 contained therein. When the vial sleeve 3 is mounted within the protective cap 4, the user can first install the vial 3 within the vial sleeve 3 within the protective cap 4. The user then holds the protective cap 4 and inserts the rear end assembly end 43 of the vial sleeve 3, which extends beyond the rear end of the protective cap 4, into the front connection portion 14 of the housing 10 of the injection mechanism 1. If the injector is a pen-shaped product, the protective cap 4 forms a pen cap.

[0084] As shown in Figure 19, the needle 5 can also be covered with a needle shield set 6, which includes a needle cover 6B and a needle shield 6A. The needle cover can be covered on the outside of the needle, and the needle shield 6A is covered on the outside of the needle cover 6B to provide safety protection for the needle 5. The needle shield 6A can also be directly covered on the outside of the needle 5 located at the front end of the medicine bottle sleeve 3. The needle shield 6A is used as a safety auxiliary tool for removing the needle 5, allowing the user to safely remove the needle 5 from the front end of the medicine bottle sleeve 3.

[0085] Regarding the use of the injection mechanism 1 and the syringe having the injection mechanism 1 of the present invention, for the convenience of explaining the present invention, the syringe having the injection mechanism 1 is used as the main body of the explanation, and the specific description is as follows.

[0086] As shown in Figures 20 and 14 , in the initial state before use, the medicine bottle 2 is connected to the front end of the injection mechanism 1 via the medicine bottle sleeve 3. A protective cap 4 is placed on the outer side of the medicine bottle sleeve 3 containing the medicine bottle 2. The "0.-(mg)" scale of the dosage scale marking group 21 of the tube 20 is located in the scale window 13 of the outer shell 10. Before use, the protective cap 4 is removed, and the needle shield group 6 containing the needle 5 is installed on the front end of the medicine bottle sleeve 3. The needle shield group 6 outside the needle 5 is then removed. The needle 5 is installed on the needle connecting end 31 at the front end of the medicine bottle sleeve 3, and the needle 5 passes through the front end of the medicine bottle sleeve 3 and punctures the medicine bottle 2.

[0087] Generally speaking, after the medicine liquid is packaged in the medicine bottle 2, a small amount of bubbles will usually remain in the medicine bottle 2. As shown in Figure 21, in order to avoid the bubbles from being injected into the human body, before the human body is injected, the front end of the medicine bottle 2 equipped with the needle 5 is first facing upward, and then the medicine bottle sleeve 3 arranged on the outside of the medicine bottle 2 is flicked several times to make the bubbles in the medicine bottle 2 move upward to the top of the medicine bottle 2, and then the dose adjustment knob 30 of the injection mechanism 1 is rotated to drive the dose scale mark group 21 of the tube 20 to rotate from the "0.-(mg)" scale to the exhaust icon 211 "--- -" aligned with the scale window 13 of the shell 10. With the front end of the medicine bottle 2 equipped with the needle 5 facing upward, press the pressing piece 90 at the rear end to drive the injection push rod 80 in the injection mechanism 1 to push against the piston 2A in the medicine bottle 2, so that the bubbles in the medicine bottle 2 are completely discharged.

[0088] In the foregoing description, rotating the dose adjustment knob 30 of the injection mechanism 1 moves the air vent icon 211 "--- -" on the dose scale marking assembly 21 of the tube 20 to the scale window 13 of the housing 10. Subsequently, pressing the push member 90 drives the injection plunger 80 to expel bubbles from the vial 2. This process is identical to the injection operation described below. Therefore, the operation of the injection mechanism 1 during bubble expulsion is described below with reference to the following description of the injection operation.

[0089] As shown in Figures 22, 24, and 28, during injection, the dose adjustment knob 30 of the injection mechanism 1 is first rotated until the predetermined dose scale on the dose scale marking set 21 of the tube 20 is aligned with the scale window 13 of the housing 10. Assuming the predetermined injection dose is 0.75 mg, the dose adjustment knob 30 is rotated to rotate the dose scale marking set 21 of the tube 20 from the "0.-(mg)" scale to the "0.75-(mg)" scale, aligned with the scale window 13. Next, the needle 5 is inserted into the injection site of the human body, and the push member 90 is pressed to perform the injection. The steps for setting the injection dose and executing the injection are as follows.

[0090] When the dose adjustment knob 30 is rotated to the predetermined dose scale of the dose scale mark group 21 of the tube 20 to the scale window 13 of the housing 10, the injection plunger 80 is limited by the connecting component 70 fixed in the housing 10 and the clutch control ring 60 constrained in the connecting component 70. The clutch teeth 32 of the dose adjustment knob 30 can be relatively engaged with the tooth portion 22 at the rear end of the tube 20. The drive ring 50 located in the tube 20 extends into the scale window 13 with the axial guide portion 52. The movable guide groove 25 in the tube 20 allows the dose adjustment knob 30 to rotate forward from the "0.-(mg)" scale to the "0.75-(mg)" scale to align with the scale window 13. At the same time, the dose adjustment knob 30 drives the tube 20 to rotate forward, and drives the drive ring 50 to rotate backward along the forward spiral guide groove 801 of the injection push rod 80 to a distance position relative to the injection dose. At the same time, the elastic component 40 is compressed by the abutment ring 41 to accumulate elastic potential energy.

[0091] When a forward pressing force is applied to the pressing member 90, the tube 20 is pushed forward by the pressing member 90, so that the tooth portion 22 at the rear end of the tube 20 disengages the clutch tooth 32 of the dose adjustment knob 30, and then the alignment groove 24 at the front end of the tube 20 engages with the alignment tooth 63 of the clutch control ring 60 on the front side. Subsequently, under the action of the elastic potential energy of the elastic component 40, the drive ring 50 is driven forward to contact the clutch control ring 60 and then stops. At the same time, the drive ring 50 The screw connection combination structure of the forward spiral portion 51 and the forward spiral guide groove 801 of the injection push rod 80, with the assistance of the screw connection combination structure of the forward screw connection portion 71 of the connecting component 70 and the forward spiral guide groove 801 of the injection push rod 80, enables the injection push rod 80 to spirally advance forward under the action of elastic potential energy, and then pushes the piston 2A in the medicine bottle 2 forward through the piston abutment 81 at the front end of the injection push rod 80, and a predetermined amount of medicine liquid in the medicine bottle 2 is injected into the human body through the needle 5.

[0092] As shown in Figures 22 to 28, in the process of the injection push rod 80 being spirally advanced forward, the reverse spiral portion 61 of the clutch control ring 60 and the reverse spiral guide groove 802 of the injection push rod 80 are screwed together, and the alignment groove 24 at the front end of the tube 20 is engaged with the alignment tooth 63 of the clutch control ring 60 on the front side. Therefore, the injection push rod 80 is spirally advanced forward under the action of elastic potential energy, while driving the clutch control ring 60, the tube 20 and the drive ring 50 located in the tube 20 to rotate synchronously in the opposite direction until the "0.-(mg)" scale of the dosage scale of the tube 20 is rotated back to the scale window 13 position of the housing 10.

[0093] After the injection is complete, the drive ring 50 remains in contact with the rear end of the clutch control ring 60. The elastic force of the elastic component 40 pushes the tube 20 backward, disengaging the alignment groove 24 at the front end of the tube 20 from the alignment teeth 63 of the front clutch control ring 60. The tooth portion 22 at the rear end of the tube 20 reengages with the clutch teeth 32 of the dose adjustment knob 30. This completes a single injection. After the injection is complete, the user securely removes the needle 5 from the front end of the vial sleeve 3 by placing the needle guard 6A over the needle 5. Using the needle guard 6A as a safety aid for removing the needle 5, the user then securely removes the needle 5 from the front end of the vial sleeve 3. The protective cap 4 is then placed over the vial sleeve 3, preserving the needle 5 for the next use.

[0094] As shown in Figures 23 and 30 , the aforementioned operation continues until the liquid medicine in the vial 2 is depleted. The injection mechanism 1 utilizes a connection member 70 fixed to the housing 10 to restrict the clutch control ring 60 to fixed-point reverse rotation, and a threaded connection between the clutch control ring 60 and the injection plunger 80 via the reverse spiral guide groove 802. Consequently, when the dose adjustment knob 30 is rotated, the injection plunger 80 is restrained and prevented from rotating. Therefore, if the remaining liquid medicine in the vial 2 is less than the predetermined injection dose, as shown in Figure 29 , the distance between the stopper 804 at the rear end of the injection plunger 80 and the abutment ring 41 on the rear side of the drive ring 50 is less than the travel distance of the predetermined injection dose. For example, if the predetermined injection dose is 0.75 mg and the remaining liquid medicine in the vial 2 is 0.5 mg, the distance between the stopper 804 and the abutment ring 41 on the rear side of the drive ring 50 only corresponds to the travel distance of the injection dose of 0.5 mg. Therefore, when the user rotates the dose adjustment knob 30 until the dose scale mark group 21 of the tube 20 is rotated from the "0.-(mg)" scale to the "0.5-(mg)" scale and reaches the scale window 13, the abutment ring 41 on the rear side of the drive ring 50 contacts the stopper 804 at the rear end of the injection plunger 80, and the stopper 804 produces a locking effect, and the user cannot rotate the dose adjustment knob 30 any further until the "0.75-(mg)" scale of the tube 20 is aligned with the scale window 13.

[0095] Similarly, as shown in Figures 23 and 30, when the liquid medicine in the medicine bottle 2 is used up, the stopper 804 at the rear end of the injection plunger 80 will also produce a locking effect on the rear side of the abutment ring 41 on the rear side of the drive ring 50, preventing the user from rotating the dose adjustment knob 30. When the liquid medicine in the medicine bottle 2 is used up, after the needle guard 6A is placed on the outside of the needle 5 and the needle 5 is safely removed from the front end of the medicine bottle sleeve 3, the protective cover 4 is placed on the outside of the medicine bottle sleeve 3, and the syringe is discarded together with the empty medicine bottle 2. The syringe is used a limited number of times to ensure the safety of the syringe.

[0096] The above description is merely an embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as above by the embodiment, it is not intended to limit the present invention. Any technician familiar with the profession can make some changes or modifications to equivalent embodiments of the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. An injection mechanism with a function of adjusting the injection dosage, which can be assembled with a medicine bottle, wherein: The injection mechanism comprises: A hollow shell; An injection push rod is installed in the housing and can be driven to move forward along the axial direction to perform an injection action on the medicine bottle; An injection dose adjustment assembly, which can be connected to the injection plunger, and comprises: A tube, which is installed in the housing so as to be rotatable and movable forward and backward, and the injection push rod is located in the tube; a dose adjustment knob, which is rotatably assembled at the rear end of the housing and can be clutched to the tube; when the dose adjustment knob is connected to the tube, the dose adjustment knob can rotate the tube; a driving ring, which is installed in the tube and threadedly connected to the injection push rod; an elastic component disposed in the tube, the elastic component being located between the drive ring and the tube and capable of providing elastic force to connect the tube to the dosage adjustment knob, and when the dosage adjustment knob rotates the tube, the elastic component is acted upon by the drive ring to generate an elastic potential energy; and a pressing member, which is installed at the rear end of the dosage adjustment knob, and the pressing member can trigger the tube to separate from the dosage adjustment knob, so that the elastic component releases the elastic force to push the drive ring to drive the injection push rod to move forward spirally; and A clutch control component is installed inside the front end of the shell, and when the dosage adjustment knob rotates the tube, the clutch control component limits the injection push rod, and when the tube is triggered to disengage from the dosage adjustment knob, the clutch control component can connect to the tube, and after the injection push rod completes the injection action, the elastic component drives the tube to disengage from the clutch control component and reset.

2. The injection mechanism with the function of adjusting the injection dose as claimed in claim 1, wherein: The housing has a scale window, and a plurality of dosage scales are arranged in a circular pattern on the outer circumference of the tube; when the dosage adjustment knob is connected to the tube, the dosage adjustment knob can rotate any dosage scale on the tube to move to the scale window; When the dosage adjustment knob rotates a dosage scale of the tube to move to the scale window, the elastic component is acted upon by the drive ring to generate the elastic potential energy corresponding to the dosage scale, and the clutch control component limits the injection push rod.

3. The injection mechanism with the function of adjusting the injection dosage as claimed in claim 2, wherein: The outer peripheral surface of the injection push rod is provided with a forward spiral guide groove and a reverse spiral guide groove, and the rear end of the injection push rod located behind the driving ring is provided with a stopper; A positive spiral portion is formed in the driving ring, and the positive spiral portion is threadedly engaged with the positive spiral guide groove; The clutch control assembly includes: a clutch control ring, which is installed on the front side of the pipe and the drive ring, and a reverse spiral portion is formed in the clutch control ring, and the reverse spiral portion and the forward spiral portion driven by the push rod are spiral portions with opposite rotation directions to each other, and the injection push rod is screwed in the clutch control ring, and the reverse spiral portion is screwed and matched with the reverse spiral guide groove, and the clutch control ring can be relatively clutched with the operated pipe; and A connecting component is installed on the inner side of the front end of the shell and is located on the front side of the clutch control ring, and limits the clutch control ring to be driven to rotate in the opposite direction only at a fixed point. The connecting component has a center hole and a positive threaded connection portion located in the center hole. The injection push rod is threaded in the connecting component, and the positive threaded connection portion is threadedly matched with the positive spiral guide groove.

4. The injection mechanism with the function of adjusting the injection dosage as claimed in claim 3, wherein: The pitch of the forward spiral guide groove is equal to that of the reverse spiral guide groove.

5. The injection mechanism with injection dosage adjustment function as claimed in claim 3, wherein: The pitches of the positive spiral guide groove and the reverse spiral guide groove are not equal.

6. The injection mechanism with the function of adjusting the injection dosage as claimed in claim 3, wherein: The inner peripheral surface of the front end of the pipe is formed with a plurality of alignment slots extending from front to back and at least one moving guide slot; The outer peripheral surface of the driving ring has at least one axial guide portion, and the axial guide portion is located in the moving guide groove of the pipe, and the driving ring can move forward and backward in the pipe; The outer peripheral surface of the clutch control ring is formed with a plurality of alignment teeth and a plurality of elastic buckles, and the alignment teeth of the clutch control ring can be relatively engaged with the alignment groove inside the front end of the pipe; The inner circumference of the connecting component is arranged in a ring to form a plurality of single oblique ratchets, the front end of the clutch control ring is pivotally arranged in the connecting component, the elastic buckle of the clutch control ring can be buckled in the single oblique ratchets, and the clutch control ring can only be driven to rotate in the reverse direction at a fixed point.

7. The injection mechanism with the function of adjusting the injection dosage as claimed in claim 1, wherein: The front end of the elastic component is provided with an abutment ring, which is sleeved on the outer side of the injection push rod. The elastic component is contacted and connected with the rear end of the driving ring through the abutment ring.

8. The injection mechanism with the function of adjusting the injection dosage as claimed in claim 7, wherein: The elastic component is a compression spring. When the dosage adjustment knob rotates the tube, the elastic component is compressed by the drive ring via the abutment ring to accumulate the elastic potential energy.

9. The injection mechanism with the function of adjusting the injection dose according to any one of claims 1 to 8, wherein: The inner peripheral surface of the rear end of the shell is formed with a plurality of shell wall meshing teeth distributed in an equiangular annular pattern; The outer peripheral surface of the rear end of the pipe is provided with a plurality of latching teeth extending convexly backwards, and at least one guide block located in front of the latching teeth, the guide block being able to mesh with the shell wall meshing teeth inside the rear end of the shell; An inner ring plate and a plurality of clutch teeth arranged in a circle on the front side of the inner ring plate are arranged in the dosage adjustment knob. The clutch teeth of the dosage adjustment knob can be relatively meshed with the tooth portion of the tube.

10. A syringe with a function of adjusting the injection dose, wherein: It includes: An injection mechanism with a function of adjusting injection dosage according to any one of claims 1 to 9; as well as A medicine bottle sleeve can be sleeved on the outside of the medicine bottle and assembled to the front end of the shell.

11. The syringe with the function of adjusting the injection dosage according to claim 10, wherein: The peripheral wall of the medicine bottle sleeve forms at least one medicine bottle window, and the state of the medicine liquid in the medicine bottle can be viewed through the bottle window; the front end of the medicine bottle sleeve has a needle connecting end, and the needle connecting end can be assembled with a needle, so that the needle passes through the front end of the medicine bottle sleeve and punctures into the medicine bottle.

12. The syringe with the function of adjusting the injection dosage according to claim 10 or 11, wherein: The front end connecting portion of the housing has a plurality of annular grooves formed on the inner peripheral surface of the housing wall and arranged in a front-to-back interval, and a plurality of grooves parallel to the central axis of the injection mechanism; The rear end of the medicine bottle sleeve has a connecting end, the shape of the outer circumference of the connecting end matches the shape of the inner circumference of the front end connecting part of the shell wall, and the connecting end of the rear end of the medicine bottle sleeve can be disassembled and installed in the front end connecting part of the shell.

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