Injection mechanism and syringe with dose adjustment function

Abstract

The present invention relates to an injection mechanism and syringe with an injection dose adjustment function. The injection mechanism (1) has a housing (10) which contains a plunger (80) and an injection dose adjustment means (1a) and a retraction control means (1b) connected to the plunger (80). The injection dose adjustment means (1a) drives the plunger (80) by rotating a tubular member (20) with a dose adjustment knob (30) to drive a drive ring (50), thereby generating elastic potential energy in an elastic means (40).

Description

Technical Field

[0001] The present invention relates to the technical field of syringes, and more particularly to an injection mechanism and a syringe with an injection dose adjustment function.

Background Art

[0002] Under the safety norms of drug solution injection, conventional syringes already have the function of metered injection. That is, after attaching a medicine bottle to a metering syringe, by pressing the plunger at the rear end of the syringe and coupling it to be linked to the drive mechanism inside the syringe, the piston in the medicine bottle is pushed to move a certain stroke, and ultimately a certain dose of drug solution is discharged from the injection needle connected to the front end of the medicine bottle.

[0003] In some conventional metering syringes, the injection mechanism utilizes the design of its dose control function structure. After connecting a medicine bottle to the injection mechanism, it controls the injection dose each time and locks after repeated use reaches a predetermined number of times, thereby promoting the disposal of the entire syringe and ensuring the use safety of pen-type syringes.

[0004] The above-mentioned conventional metering syringes provide the function of discharging a certain dose of drug solution, but in the use of syringes, usually, it is necessary to adjust the injection dose according to the needs of different injection targets. Since the conventional metering syringes lack the function of adjusting the injection dose, it is difficult to meet the needs of different users.

[0005] To address the aforementioned problem of being unable to adjust the injection dose, some conventional measuring syringes employ an injection mechanism that allows for dose adjustment, thus accommodating the different injection dose needs of different users. In this injection mechanism, a medicine bottle is connected using a medicine bottle connection device, and an adjustable propulsion device is installed within the medicine bottle connection device and inserted into the medicine bottle. A rotary knob on the medicine bottle connection device allows the plunger of the adjustable propulsion device to be moved backward to a predetermined mark. During injection, pressing the plunger dispenses a predetermined dose of liquid medicine from the medicine bottle, and the syringe can adjust the injection dose according to the needs of different injection targets.

[0006] In the syringes described above, those with an injection mechanism for adjusting the injection dose can be connected to a vial containing the drug solution, allowing the user to adjust the injection dose according to the doctor's prescription before injecting. However, in the process of injecting using this syringe's injection mechanism, the user must press the plunger of the injection mechanism for its entire stroke, which requires force to operate. Furthermore, when injecting again using this syringe's injection mechanism, it must be manually returned to its original position, making it inconvenient to use. [Overview of the Initiative] [Problems that the invention aims to solve]

[0007] The technical problems that this invention solves are: the fact that some conventional syringe injection mechanisms can only provide quantitative injection of the same dose multiple times, and cannot accommodate the need for different injection doses for different target patients or the need to adjust injection doses according to a physician's prescription; and the fact that some injection mechanisms can only adjust the injection dose, but require force to use and are inconvenient to operate. This invention provides an injection mechanism and syringe with an injection dose adjustment function to solve these problems. [Means for solving the problem]

[0008] The technical solution proposed by the present invention is an injection mechanism with an injection dose adjustment function to which a drug bottle can be attached, and the injection mechanism is A hollow housing and A plunger mounted within the housing and driven to move forward along the axial direction to perform an injection action into the medicine bottle, An injection dose adjustment means that can be connected to the plunger, A tubular member is mounted in the housing so as to be rotatable and movable back and forth, and the plunger is positioned inside it, A dosage adjustment knob is rotatably attached to the rear end of the housing and connected to the tubular member so as to be able to move toward and away from it, and while connected to the tubular member, the tubular member can be rotated. A drive ring is installed inside the tubular member and is screwed onto the plunger, An elastic means provided within the tubular member and positioned between the drive ring and the tubular member, which applies elastic force to connect the tubular member to the dose adjustment knob, wherein when the dose adjustment knob rotates the tubular member, the elastic means generates elastic potential energy through the action of the drive ring, An injection dose adjustment means including: an injection dose adjustment means, which includes a pressing member attached to the rear end of the dose adjustment knob, which triggers the tubular member to move away from the dose adjustment knob, thereby driving the plunger to move forward in a spiral motion by releasing the elastic potential energy of the elastic means and pushing the drive ring; The objective is to provide an injection mechanism with an injection dose adjustment function, comprising: a release control means attached inside the front end of the housing, which restricts the position of the plunger when the dose adjustment knob rotates the tubular member, and which is connected to the tubular member when the tubular member is triggered to move away from the dose adjustment knob, wherein after the plunger completes the injection operation, the elastic means drives the tubular member away from the release control means and back to its original position.

[0009] Another technical solution proposed by the present invention is to provide a syringe with an injection dose adjustment function, which includes the injection mechanism with injection dose adjustment function described above, and a medicine bottle sleeve that can be fitted onto the outside of the medicine bottle and attached to the front end of the housing.

[0010] The present invention provides a structure that comprises the injection mechanism and syringe including the injection mechanism as a whole, and when performing an injection after attaching a medicine bottle, it has at least the following beneficial effects.

[0011] 1. Function to adjust injection dose: The injection mechanism is connected to a plunger using injection dose adjustment means provided in the housing. The tubular member is rotated by the dose adjustment knob, and the drive ring is moved using the tubular member, causing the elastic means to generate elastic potential energy. When the pressing member triggers the tubular member away from the dose adjustment knob, the elastic means releases the elastic potential energy and pushes the drive ring, driving the plunger to move forward in a spiral motion, thereby giving the injection mechanism the function to adjust the injection dose.

[0012] 2. Reusable multiple times: The injection mechanism uses a recoil control means mounted inside the front end of the housing so that when the dose adjustment knob rotates the tubular member, the recoil control means can restrict the position of the plunger. When the tubular member is triggered to move away from the dose adjustment knob, the recoil control means is connected to the tubular member, and after the plunger completes the injection operation, the elastic means drives the tubular member away from the recoil control means and back to its original position, thereby enabling the injection mechanism to repeatedly perform the injection operation to adjust the adjusted injection dose multiple times.

[0013] 3. Operation is labor-saving and simple: As described above, the injection mechanism connects to the plunger using injection dose adjustment means provided in the housing, and when the tubular member is rotated by the dose adjustment knob, the drive ring is moved using the tubular member, causing the elastic means to generate elastic potential energy, and when the pressing member triggers the tubular member to separate from the dose adjustment knob, the injection mechanism releases the elastic potential energy using the elastic means, and the drive ring drives the plunger to move forward in a spiral motion, thereby providing the technical effect of labor-saving and simple operation.

[0014] The injection mechanism and syringe of the present invention can further provide a function for precisely adjusting the injection dose. Herein, the housing has a scale window and a plurality of dose scales are arranged in an annular manner on the outer circumferential surface of the tubular member. With the tubular member connected to the dose adjustment knob, the dose adjustment knob is rotated to move one of the dose scales on the tubular member to the scale window. When the dose adjustment knob is rotated to move the dose scale on the tubular member to the scale window, the elastic means generates the elastic potential energy corresponding to the dose scale by the action of the drive ring, and the retraction control means restricts the position of the plunger. This enables the injection mechanism and syringe to allow the user to precisely adjust the injection dose according to the physician's prescription.

[0015] The injection mechanism and syringe of the present invention can further provide a locking function. In this injection mechanism, the outer circumferential surface of the plunger has a forward spiral guide groove and a reverse spiral guide groove, the plunger has a stopper portion at its rear end located behind the drive ring, and the drive ring has a forward spiral portion formed therein that screws into the forward spiral guide groove. The recoil control means includes a connecting member and a recoil control ring provided in the connecting member, the recoil control ring has a reverse spiral portion formed therein that screws into the reverse spiral guide groove of the plunger, and the recoil control ring recoils relative to the tubular member being operated. The connecting member restricts the recoil control ring to be driven in reverse rotation only at fixed points. The connecting member has a forward screw connection portion that screws into the forward spiral guide groove of the plunger. With this configuration, when the liquid medicine in the vial of the injection mechanism is used up, the stopper at the rear end of the plunger is positioned behind the drive ring and its position is restricted, or when the amount of liquid medicine remaining in the vial falls below a predetermined injection dose, and the distance of the stopper at the rear end of the plunger to the contact ring on the rear side of the drive ring falls below the stroke of a predetermined injection dose, the user rotates the tubular member by turning the dose adjustment knob, and the drive ring driven by this rotation is restricted in position by the stopper at the rear end of the plunger. In this case, the user is unable to rotate the dose adjustment knob until the tubular member is in a position for a larger injection dose, resulting in a locked state. [Brief explanation of the drawing]

[0016] [Figure 1] This is a schematic plan view of one embodiment of the injection mechanism with injection dose adjustment function of the present invention, with a medicine bottle attached. [Figure 2] Figure 1 is a schematic three-dimensional exploded view of an example of the injection mechanism shown. [Figure 3] Figure 1 is a schematic three-dimensional exploded view from another perspective of an embodiment of the injection mechanism shown. [Figure 4] Figures 2 and 3 are schematic three-dimensional cross-sectional views of the housing in an embodiment of the injection mechanism. [Figure 5]It is a three-dimensional cross-sectional schematic view of a tubular member in an embodiment of the injection mechanism shown in FIGS. 2 and 3. [Figure 6] It is a three-dimensional cross-sectional schematic view of a dose adjustment knob in an embodiment of the injection mechanism shown in FIGS. 2 and 3. [Figure 7] It is a three-dimensional cross-sectional schematic view of a drive ring from different viewpoints in an embodiment of the injection mechanism shown in FIGS. 2 and 3. [Figure 8] It is a three-dimensional cross-sectional schematic view of a drive ring from different viewpoints in an embodiment of the injection mechanism shown in FIGS. 2 and 3. [Figure 9] It is a three-dimensional cross-sectional schematic view of a clutch control ring from different viewpoints in an embodiment of the injection mechanism shown in FIGS. 2 and 3. [Figure 10] It is a three-dimensional cross-sectional schematic view of a clutch control ring from different viewpoints in an embodiment of the injection mechanism shown in FIGS. 2 and 3. [Figure 11] It is a three-dimensional cross-sectional schematic view of a connecting member in an embodiment of the injection mechanism shown in FIGS. 2 and 3. [Figure 12] It is a three-dimensional schematic view (one) of a combination of some means in an embodiment of the injection mechanism shown in FIGS. 2 and 3. [Figure 13] It is a three-dimensional schematic view (two) of a combination of some means in an embodiment of the injection mechanism shown in FIGS. 2 and 3. [Figure 14] It is a cross-sectional schematic view at the position of cutting line A-A of the injection mechanism with the medicine bottle shown in FIG. 1. [Figure 15] It is a cross-sectional schematic view at the position of cutting line B-B of the injection mechanism with the medicine bottle shown in FIG. 1. [Figure 16] It is a cross-sectional schematic view at the position of cutting line C-C of the injection mechanism with the medicine bottle shown in FIG. 1. [Figure 17] It is a cross-sectional schematic view at the position of cutting line D-D of the injection mechanism with the medicine bottle shown in FIG. 1. [Figure 18] It is a three-dimensional schematic view of one embodiment of the syringe with an injection dose adjustment function of the present invention. [Figure 19] It is a partially disassembled three-dimensional schematic view of an embodiment of the syringe shown in FIG. 18. [Figure 20] Figures 18-19 are reference diagrams (1) showing the usage state of the syringe in the example shown. [Figure 21] Figures 18-19 are reference diagrams (2) showing the usage state of the syringe in the example shown. [Figure 22] Figures 18-19 are reference diagrams (III) showing the usage state of the syringe in the example shown. [Figure 23] Figures 18-19 are reference diagrams (IV) showing the usage state of the syringe in the example shown. [Figure 24] Figures 18-19 show schematic cross-sectional diagrams (1) of the syringe in use as an embodiment. [Figure 25] Figure 24 is a partially three-dimensional schematic diagram of an embodiment of the syringe shown. [Figure 26] Figures 18-19 show schematic cross-sectional diagrams (2) of the syringe in use as an embodiment. [Figure 27] Figures 18-19 show schematic cross-sectional diagrams (3) of the syringe in use as an embodiment. [Figure 28] Figures 26 and 27 are partial schematic diagrams of the syringe embodiment shown in Figures 26 and 27. [Figure 29] Figures 18-19 show schematic cross-sectional diagrams (IV) of the syringe in use as an embodiment. [Figure 30] Figures 18-19 show schematic cross-sectional diagrams (5) of the syringe in use as an embodiment. [Explanation of Symbols]

[0017] 1 Injection mechanism L center axis E1 front end E2 rear end F forward direction 1a Injection dose adjustment means 1b Passing / Passing Control Means 10 Housing 11 Housing Walls 12 Containment space 13 Scale window 14 Front end connection 141 Ring groove 142 Tank groove 143 Axial guide groove 144 Engagement groove 15 Rear end connection 151 Front position limiting stopper section 152 Rear position limiting stopper section 16 Housing wall occlusal teeth 20 Tubular member 200 Installation space 21 Dosage scale mark set 211 Air release mark 22 Locking teeth 23 Guide Block 24 Alignment locking groove 25 Moving guide groove 26 Contact part 27 Front position limiting section 28 Rear position limiting section 30 Dosage adjustment knob Sections of 300 sets 31 Inner ring plate 32 Separation locking teeth 40 Elastic means 41 Contact ring 411 Contact area 50 drive ring 51 Positive spiral part 52 Axial guide section 53 Flange 60 Passing / Passing Control Ring 61 Reverse spiral part 62 Elastic locking body 63 Alignment locking teeth 70 Connecting Member 700 Movable space 71 Forward threaded section 72 connecting rails 73 Locking block 74. Single-angle ratchet 80 plungers 801 Forward spiral guide groove 802 Reverse spiral guide groove 803 front end 804 Stopper section 81 Piston contact member 90 Pressing member 2 medicine bottles 2A Piston 3 Medicine bottle sleeves 31 Injection needle connection end 32 Assembly end 33 Medicine bottle window 4. Protective cap 5 Syringe needle 6. Injection needle protective cover set 6A Injection needle protective cover 6B Injection needle cap [Modes for carrying out the invention]

[0018] The following sections, with reference to the drawings and embodiments of the present invention, will provide a more detailed explanation of the technical means employed by the present invention to achieve its intended objectives.

[0019] The technical solution of the present invention includes an injection mechanism with an injection dose adjustment function and a syringe with an injection dose adjustment function, the syringe including the injection mechanism. The specific configurations of the injection mechanism and syringe of the present invention will be described below, with reference to the drawings and embodiments.

[0020] As shown in Figure 1, which discloses one embodiment of the injection mechanism 1 with injection dose adjustment function of the present invention, a medicine bottle 2 can be directly or indirectly attached to the front end of the injection mechanism 1, and an injection needle 5 is attached to the front end of the medicine bottle 2, thereby forming a syringe equipped with a drug solution injection function. In the above, the medicine solution and a piston are contained inside the medicine bottle 2, and the injection needle 5 enters the inside of the medicine bottle by passing through the end plug at the front end of the medicine bottle. When the piston inside the medicine bottle 2 is pushed by the injection mechanism 1, the medicine solution inside the medicine bottle 2 is discharged through the injection needle 5 and the injection operation is performed.

[0021] To make the description of the embodiment of the injection mechanism 1 of the present invention easier to understand, we will first define the directions. Here, as shown in Figure 1, the injection mechanism 1 has a central axis L, and the direction of the central axis L is defined as the axial direction, and the direction perpendicular to the central axis L is defined as the radial direction. Furthermore, one end of the injection mechanism 1 on the side where the medicine bottle is attached along the direction of the central axis L is defined as the front end E1, and the other opposite end is defined as the rear end E2. In the viewpoint direction as seen from the rear end E2, the clockwise direction with respect to the central axis L is defined as the positive direction F, and conversely, the counterclockwise direction is defined as the reverse direction.

[0022] As shown in Figures 2 and 3, the injection mechanism 1 includes a housing 10, a plunger 80, an injection dose adjustment means 1a, and a retraction control means 1b. The specific structures of each of these will be described in detail below.

[0023] As shown in Figures 2, 3, and 4, the housing 10 includes a housing wall 11 and a housing space 12 located within the housing wall 11 and penetrating along the central axis direction. The housing 10 is provided with a scale window 13 that communicates radially with the housing space 12 from the outer peripheral surface of the housing wall 11.

[0024] In the embodiments shown in Figures 2, 3, and 4, the front end of the housing 10 is a front end connection portion 14 for connecting to the rear end of the medicine bottle 2, and the rear end of the housing 10 is a rear end connection portion 15 for connecting to the injection dose adjustment means 1a.

[0025] In the embodiments shown in Figures 2, 3, and 4, the front end connection portion 14 of the housing 10 has a plurality of annular grooves 141 formed on the inner circumferential surface of the housing wall 11 and arranged at intervals in the front-rear direction, and a plurality of grooved grooves 142 parallel to the central axis, and also has a plurality of engagement grooves 144. The rear end connection portion 15 has one or more rear position limiting stopper portions 152 arranged on the outer circumferential surface of the housing wall 11, and a front position limiting stopper portion 151 provided at intervals in front of the rear position limiting stopper portions 152, and the rear end connection portion 15 has a plurality of housing wall engaging teeth 16 formed on the inner circumferential surface of the housing wall 11 and arranged in annular shape at equal angles. The housing 10 has at least one axial guide groove 143 formed on the inner circumferential surface of the housing wall 11 that extends rearward from the front end.

[0026] As shown in Figures 2, 3 and 12-14, the plunger 80 is mounted within the housing 10 and is movable forward along its central axis. The plunger 80 can either directly drive the piston 2A in the medicine bottle 2 to perform an injection, or a piston contact member 81 can be coupled to the front end 803 of the plunger 80 to drive the piston 2A in the medicine bottle 2 to perform an injection. In this embodiment, the outer circumferential surface of the plunger 80 has a forward spiral guide groove 801 and a reverse spiral guide groove 802, and the spiral pitch of the forward spiral guide groove 801 and the reverse spiral guide groove 802 is the same. The spiral pitch of the forward spiral guide groove 801 and the reverse spiral guide groove 802 and the length of the plunger 80 are set based on the injection dose to be dispensed when the injection dose adjustment means 1a acts on the medicine bottle in cooperation with the plunger 80. The rear end of the plunger 80 has a stopper portion 804 that limits its position and provides a stopping action. In this embodiment, the forward spiral guide groove 801 and the reverse spiral guide groove 802 have the same spiral pitch. However, in other embodiments, the forward spiral guide groove 801 and the reverse spiral guide groove 802 may be designed to have different spiral pitches depending on the adjustment speed needs or other requirements, and this is not limited to the embodiment described herein.

[0027] As shown in Figures 2, 3, and 14, the injection dose adjustment means 1a is mounted in the housing 10 and connected to the plunger 80, the front end of the plunger 80 extending outward from the front end of the injection dose adjustment means 1a, the injection dose adjustment means is manually adjusted to set to a plurality of different injection dose values ​​and generate elastic potential energy corresponding to the magnitude, and when the injection dose adjustment means is triggered, the plunger 80 is driven by the different elastic potential energies to move with strokes of different lengths, causing the plunger 80 to perform an injection action of different injection doses in the vial.

[0028] As shown in Figures 2, 3, and 14, the injection dose adjustment means 1a includes a tubular member 20, a dose adjustment knob 30, a drive ring 50, an elastic means 40, and a pressing member 90.

[0029] As shown in Figures 2, 3, 5, 14, and 15, the tubular member 20 is mounted in the housing space 12 of the housing 10 so as to be rotatable and move back and forth along the central axis, and the outer circumferential surface of the tubular member 20 has a set of dose scale marks 21 having a plurality of dose scales, the dose scales are set based on injection doses commonly prescribed by a physician or based on injection doses specified in a physician's prescription. In this embodiment, the dose scale mark set 21 includes a plurality of dose scales such as "-0-(mg)", "0.25-(mg)", "0.5-(mg)", "0.75-(mg)", and "1.0-(mg)", and these plurality of dose scales are arranged in a ring at predetermined positions on the outer circumferential surface of the tubular member 20, but are not limited thereto.

[0030] The dose scale mark set 21 further includes an air release mark 211, represented in this embodiment by the symbol "----", which is used to prompt the user to release air from the medicine bottle when it is close to the "-0-(mg)" scale position, and the dose scale and the air release mark 211 of the dose scale mark set 21 are selectively displayed in the scale window 13 of the housing 10 as the tubular member 20 rotates.

[0031] The tubular member 20 has a mounting space 200 inside, and the inner circumferential surface of the front end of the tubular member 20 has a plurality of alignment locking grooves 24 extending from front to rear and at least one movable guide groove 25 formed thereon, and at least one contact portion 26 formed in the rear part of the mounting space 200 of the tubular member 20, and the outer circumferential surface of the rear end of the tubular member 20 is provided with a plurality of locking teeth 22 extending convexly backward along the central axis direction and at least one guide block 23 located in front of the locking teeth 22 and protruding radially, and the guide block 23 can mesh with the meshing teeth 16 of the housing wall inside the rear end of the housing 10, and the plunger 80 is inserted into the mounting space 200 of the tubular member 20.

[0032] A front position limiting portion 27 is formed on the outer circumferential surface of the front part of the tubular member 20, and a rear position limiting portion 28 is formed on the outer circumferential surface of the rear part of the tubular member 20. The rear position limiting portion 28 is positioned between the dose scale mark set 21 and the guide block 23, thereby limiting the range in which the tubular member 20 moves back and forth along the central axis direction.

[0033] As shown in Figures 2, 3, 6, and 14, the dose adjustment knob 30 is rotatably fitted onto the rear end connection portion 15 of the housing 10 and connectable to the tubular member 20. The dose adjustment knob 30 can rotate the tubular member 20 until any of the dose scales in the dose scale mark set 21 or the air vent mark 211 is positioned in the scale window 13 of the housing 10. The dose adjustment knob 30 has an assembly section 300, and at the rear of the assembly section 300, there is an inner ring plate 31 and a plurality of interlocking teeth 32 arranged in an annular manner on the front surface of the inner ring plate 31. The interlocking teeth 32 of the dose adjustment knob 30 can engage with the locking teeth portion 22 at the rear end of the tubular member 20, and the interlocking teeth 32 can be separated from the locking teeth portion 22 by moving the tubular member 20 forward.

[0034] As shown in Figures 2, 3, 7, 8, and 14, the drive ring 50 is mounted within the mounting space 200 of the tubular member 20 and screwed onto the plunger 80. In this embodiment, a forward-direction helical portion 51 is formed in the drive ring 50, and the forward-direction helical portion 51 is screwed into the forward-direction helical guide groove 801 of the plunger 80. At least one axial guide portion 52 is provided on the outer circumferential surface of the drive ring 50, and the axial guide portion 52 is located in the movement guide groove 25 of the tubular member 20, allowing the drive ring 50 to move back and forth along the central axis within the tubular member 20, and the drive ring 50 can rotate together with the tubular member 20 outside the plunger 80.

[0035] As shown in Figures 2, 3, and 14, the elastic means 40 is installed within the mounting space 200 of the tubular member 20 and can be operated to generate elastic potential energy. In this embodiment, a compression spring is selected as the elastic means 40, and the elastic means 40 is fitted to the outside of the plunger 80 and is pre-pressurized and installed between the drive ring 50 and the contact portion 26 in the mounting space 200 of the tubular member 20. The pre-pressurized elastic force of the elastic means 40 generates a thrust that moves the tubular member 20 backward, so that the tubular member 20 and the dose adjustment knob 30 are connected.

[0036] As shown in Figures 2, 3, 7, 8, and 14, in the above configuration, the rear end of the elastic means 40 contacts the contact portion 26 in the tubular member 20, the front end of the elastic means 40 is attachable to the contact ring 41, the plunger 80 penetrates the contact ring 41, the contact ring 41 is movable on the plunger 80, and the elastic means 40 is connected to the drive ring 50 by contacting the contact ring 41. The outer circumferential surface of the contact ring 41 has a contact portion 411 that provides a portion that contacts the front end of the elastic means 40. The rear end of the drive ring 50 may further have one or more flanges 53 formed thereon, which are pivotally mounted within the contact ring 41 via the flanges 53, and the drive ring 50 is rotatable and in contact with the front end of the contact ring 41.

[0037] 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 attached to the rear end of the dose adjustment knob 30 so as to be movable back and forth. When the pressing member 90 is pressed forward, it pushes the tubular member 20 to move forward, causing the locking teeth 22 of the tubular member 20 to separate from the engagement / disengagement teeth 32 of the dose adjustment knob 30.

[0038] As shown in Figures 2, 3, 9-11 and 14, the recoil control means 1b is mounted inside the front of the housing 10 and positioned in front of the tubular member 20 and the drive ring 50. The recoil control means 1b is able to recoil relative to the tubular member 20. When the dose adjustment knob 30 is rotated to move one of the dose scales on the tubular member 20 to the scale window 13, the recoil control means 1b can restrict the position of the plunger 80. When the tubular member 20 is triggered to move away from the dose adjustment knob 30, the recoil control means 1b can connect to the tubular member 20. After the plunger 80 completes the injection operation, the elastic means 40 drives the tubular member 20 away from the recoil control means 1b and back to its original position. In this embodiment, the recoil control means 1b includes a recoil control ring 60 and a connecting member 70.

[0039] As shown in Figures 2, 3, 9-10 and 14, the reciprocating control ring 60 is attached to the front side of the tubular member 20 and the drive ring 50, and the reciprocating control ring 60 is able to reciprocate relative to the tubular member 20 being operated, and a reverse-direction helical portion 61 is formed in the reciprocating control ring 60, and the reverse-direction helical portion 61 and the forward-direction helical portion 51 of the drive ring 50 are helical portions with opposite helices, the plunger 80 is screwed into the reciprocating control ring 60, and the reverse-direction helical portion 61 is screwed into the reverse-direction helical guide groove 802 of the plunger 80. Multiple alignment locking teeth 63 and multiple elastic locking bodies 62 are formed on the outer circumferential surface of the separation control ring 60. The opposing locking teeth of the separation control ring 60 engage relatively with the alignment locking groove 24 inside the front end of the tubular member 20, thereby allowing the separation control ring 60 and the tubular member 20 to rotate together.

[0040] As shown in Figures 2, 3, 11, and 14, the connecting member 70 is installed inside the front end connecting portion 14 of the housing 10 and is located in front of the tubular member 20, and the front position limiting portion 27 and rear position limiting portion 28 of the tubular member 20 are located between the connecting member 70 and the rear end of the housing 10. The connecting member 70 has a central hole and a movable space 700 located behind the central hole, a forward-direction threaded portion 71 is formed in the central hole, the plunger 80 is screwed into the connecting member 70, the piston contact member 81 provided at the front end of the plunger 80 is located in front of the connecting member 70 and the forward-direction threaded portion 71 is screwed into the forward-direction helical guide groove 801 of the plunger 80. The connecting member 70 has a plurality of unidirectional ratchets 74 formed in an annular shape on the inner circumferential surface of the movable space 700, the front end of the separation control ring 60 is pivotally located within the movable space 700 of the connecting member 70, and the elastic locking body 62 of the separation control ring 60 can be locked into the unidirectional ratchets 74, while also restricting the separation control ring 60 to be driven in reverse rotation only at fixed points.

[0041] As shown in Figures 2, 3, 11, 14, and 17, the outer circumferential surface of the connecting member 70 is provided with at least one connecting rail 72 and a plurality of locking blocks 73. The connecting member 70 is mounted in the front end connecting portion 14 of the housing 10, and the locking blocks 73 are locked into the engagement grooves 144 of the housing 10 by the alignment fitting of the connecting rail 72 and the axial guide groove 143 of the housing 10, thereby fixing the connecting member 70 in the housing 10.

[0042] As can be seen from Figures 18 and 19, which disclose one embodiment of the syringe with injection dose adjustment function of the present invention, the syringe includes the injection mechanism 1 and the medicine bottle sleeve 3, and the specific configuration of the injection mechanism 1 is as described above and will not be described again here.

[0043] As shown in Figure 19, the medicine bottle sleeve 3 is fitted onto the outside of the medicine bottle 3 and assists in assembling the medicine bottle 3 to the front end of the housing 10 of the injection mechanism 1. The piston pressing member 81 attached to the front end of the plunger 80 is inserted into the medicine bottle 2 and contacts the rear end of the piston 2A. The injection needle 5 is detachably connected to the front end of the medicine bottle sleeve 3, and the injection needle 5 penetrates the front end of the medicine bottle sleeve 3 and is inserted into the medicine bottle 2.

[0044] As shown in Figures 19, 14, and 4, the rear end of the medicine bottle sleeve 3 has an assembly end 32, and the shape of the outer circumferential surface of the assembly end 32 matches the shape of the inner circumferential surface of the housing wall 11 at the front end connection portion 14 of the housing 10. In other words, the assembly end 32 of the medicine bottle sleeve 3 has an annular projection corresponding to the annular groove 141 of the front end connection portion 14 and a groove-like projection corresponding to the tank groove 142. The assembly end 32 at the rear end of the medicine bottle sleeve 3 is detachably attached to the front end connection portion 14 of the housing 10, and after assembly, the assembly end 32 at the rear end of the medicine bottle sleeve 3 can be stably positioned within the front end connection portion 14 of the housing 10.

[0045] As shown in Figure 19, the front end of the medicine bottle sleeve 3 has an injection needle connection end 31, and the injection needle 5 is detachably attached to the injection needle connection end 31, so that the injection needle 5 can pass through the front end of the medicine bottle sleeve 3 and be punctured into the medicine bottle 2. One or more medicine bottle windows 33 may be formed in the peripheral wall of the medicine bottle sleeve 3, so that the user can directly observe the state of the medicine liquid inside the medicine bottle 2 through the medicine bottle windows 33.

[0046] As shown in Figure 19, a protective cap 4 is fitted onto the outside of the medicine bottle sleeve 3, and the assembly end 32 at the rear end of the medicine bottle sleeve 3 extends from the rear end of the protective cap 4, thereby protecting the medicine bottle sleeve 3 and the medicine bottle 3 inside it. With the medicine bottle sleeve 3 installed inside the protective cap 4, the user first places the medicine bottle 3 into the medicine bottle sleeve 3 inside the protective cap 4, then holds the protective cap 4 in their hand and inserts the assembly end 43 at the rear end of the medicine bottle sleeve 3, which extends outside the rear end of the protective cap 4, into the front end connection part 14 of the housing 10 of the injection mechanism 1. If the syringe is a pen-type product, the protective cap 4 is formed in the shape of a pen cap.

[0047] As shown in Figure 19, the injection needle 5 may also be fitted with an injection needle protective cover set 6, which includes an injection needle cap 6B and an injection needle protective cover 6A, the injection needle cap being fitted to the outside of the injection needle and the injection needle protective cover 6A being fitted to the outside of the injection needle cap 6B, thereby providing safe protection for the injection needle 5. Furthermore, the injection needle protective cover 6A may be fitted directly to the outside of the injection needle 5 at the front end of the medicine bottle sleeve 3, and by using the injection needle protective cover 6A as an auxiliary tool for safely removing the injection needle 5, the user can safely remove the injection needle 5 from the front end of the medicine bottle sleeve 3.

[0048] Regarding the use of the injection mechanism 1 of the present invention and the syringe equipped with the injection mechanism 1, for the convenience of explaining the present invention, the syringe equipped with the injection mechanism 1 will be the main subject of the explanation and will be described in detail as follows.

[0049] As shown in Figures 20 and 14, in the initial state before use, the medicine bottle 2 is attached to the front end of the injection mechanism 1 by the medicine bottle sleeve 3, a protective cap 4 is fitted to the outside of the medicine bottle sleeve 3 to which the medicine bottle 2 is attached, and the "0.-(mg)" scale of the dosage scale mark set 21 of the tubular member 20 is located in the scale window 13 of the housing 10. When using, the protective cap 4 is removed, the injection needle protective cover set 6 with the injection needle 5 inside is attached to the front end of the medicine bottle sleeve 3, then the injection needle protective cover set 6 on the outside of the injection needle 5 is removed, the injection needle 5 is attached to the injection needle connection end 31 at the front end of the medicine bottle sleeve 3, and the injection needle 5 passes through the front end of the medicine bottle sleeve 3 and is punctured into the medicine bottle 2, establishing communication.

[0050] Generally, after sealing the liquid medicine in the medicine bottle 2, a small amount of air bubbles usually remain inside the medicine bottle 2. However, as shown in Figure 21, in order to prevent the air bubbles from being injected into the human body, before injection into the human body, first the front end of the medicine bottle 2 with the injection needle 5 attached is turned upward, then the medicine bottle sleeve 3 fitted to the outside of the medicine bottle 2 is lightly tapped several times to move the air bubbles inside the medicine bottle 2 upward to the top of the medicine bottle 2, then the dose adjustment knob 30 of the injection mechanism 1 is rotated to rotate the dose scale mark set 21 of the tubular member 20 from the "0.-(mg)" scale to the air release mark 211 "----" and align it with the scale window 13 of the housing 10, and with the front end of the medicine bottle 2 with the injection needle 5 attached facing upward, the pressing member 90 at the rear end is pressed, driving the plunger 80 inside the injection mechanism 1 to press against the piston 2A inside the medicine bottle 2, thereby completely expelling the air bubbles inside the medicine bottle 2.

[0051] In the above, the process of rotating the dose adjustment knob 30 of the injection mechanism 1 to move the air release mark 211 "----" of the dose scale mark set 21 of the tubular member 20 to the scale window 13 of the housing 10, and then pressing the pressing member 90 to cause the plunger 80 to expel air bubbles from the medicine bottle 2 is the same as the injection operation described below. Therefore, when expelling air bubbles, please refer to the following explanation of the injection operation for the operation of the injection mechanism 1.

[0052] As shown in Figures 22, 24 to 28, when administering an injection, first the dose adjustment knob 30 of the injection mechanism 1 is rotated to align the predetermined dose scale of the dose scale mark set 21 of the tubular member 20 with the scale window 13 of the housing 10. For example, if the predetermined injection dose is 0.75 mg, the dose adjustment knob 30 is rotated to move the dose scale mark set 21 of the tubular member 20 from the "0.-(mg)" scale to the "0.75-(mg)" scale and align it with the scale window 13. Next, the injection needle 5 is inserted into the injection site of the human body, and the pressing member 90 is pressed to perform the injection. The steps for setting the injection dose by the rotation described above and the injection operation are as follows.

[0053] In the process of moving the dose adjustment knob 30 from a predetermined dose scale on the dose scale mark set 21 of the tubular member 20 to the scale window 13 of the housing 10, the plunger 80's position is restricted by a connecting member 70 fixed inside the housing 10 and a restricting engagement / disengagement control ring 60 located inside the connecting member 70. The locking teeth 32 of the dose adjustment knob 30 can engage with the locking teeth portion 22 at the rear end of the tubular member 20, and the drive ring 50 located inside the tubular member 20 enters the movement guide groove 25 inside the tubular member 20 at the axial guide portion 52. Therefore, when the dose adjustment knob 30 is rotated in the positive direction from the "0.-(mg)" scale to the "0.75-(mg)" scale and aligned with the scale window 13, the dose adjustment knob 30 simultaneously rotates the tubular member 20 in the positive direction, and the tubular member 20 rotates the drive ring 50 backward along the positive spiral guide groove 801 of the plunger 80, moving it to a position at a distance from the injection dose, and at the same time compresses the elastic means 40 via the contact ring 41, accumulating elastic potential energy.

[0054] When a forward pressing force is applied to the pressing member 90, the tubular member 20 is moved forward by the pressing member 90, the locking teeth 22 at the rear end of the tubular member 20 separate from the engagement locking teeth 32 of the dose adjustment knob 30, and the alignment locking groove 24 at the front end of the tubular member 20 engages with the alignment locking teeth 63 of the front engagement control ring 60. Subsequently, due to the action of the elastic potential energy of the elastic means 40, the drive ring 50 is driven to move forward until it contacts the engagement control ring 60, and then stops. With the assistance of the screw connection structure between the forward-direction helical portion 51 of the drive ring 50 and the forward-direction helical guide groove 801 of the plunger 80, and the screw connection structure between the forward-direction helical portion 71 of the connecting member 70 and the forward-direction helical guide groove 801 of the plunger 80, the plunger 80 is helically propelled forward by the action of elastic potential energy, and consequently the piston contact member 81 at the front end of the plunger 80 pushes the piston 2A inside the medicine bottle 2 to move forward, and a predetermined amount of liquid medicine is injected into the human body from inside the medicine bottle 2 through the injection needle 5.

[0055] As shown in Figures 22 to 28, in the process in which the plunger 80 is helically propelled forward, in addition to the screw connection structure between the reverse helical portion 61 of the separation control ring 60 and the reverse helical guide groove 802 of the plunger 80, the alignment locking groove 24 at the front end of the tubular member 20 and the alignment locking teeth 63 of the front separation control ring 60 engage and work together. As a result, the plunger 80 is helically propelled forward by the action of elastic potential energy, and at the same time, the separation control ring 60, the tubular member 20, and the drive ring 50 located inside the tubular member 20 rotate synchronously in the opposite direction until the "0.-(mg)" scale on the dosage scale of the tubular member 20 rotates to the position of the scale window 13 of the housing 10.

[0056] After the injection is complete, the drive ring 50 remains in contact with the rear end of the interlocking control ring 60, and the elastic force of the elastic means 40 pushes the tubular member 20 backward, causing the alignment locking groove 24 at the front end of the tubular member 20 to disengage from the alignment locking teeth 63 of the front interlocking control ring 60, and the locking teeth 22 at the rear end of the tubular member 20 to re-engage with the interlocking locking teeth 32 of the dose adjustment knob 30 and return to their original position. In this way, one injection operation is completed. After the injection operation is complete, the user removes the injection needle protective cover 6A from the outside of the injection needle 5 and uses the injection needle protective cover 6A as a safety aid to remove the injection needle 5, thereby safely removing the injection needle 5 from the front end of the medicine bottle sleeve 3, and also removes the protective cap 4 from the outside of the medicine bottle sleeve 3 in preparation for the next use.

[0057] As shown in Figures 23 and 30, the above-described operating procedure is followed until the liquid medicine in the medicine bottle 2 is completely used up. The injection mechanism 1 has a structure in which the separation control ring 60 is limited to being driven in the reverse direction only at a fixed point by a connecting member 70 fixed in the housing 10, and a screw connection structure between the separation control ring 60 and the reverse direction helical guide groove 802 of the plunger 80, so that when the dose adjustment knob 30 is rotated, the position of the plunger 80 is limited and it stops rotating. Therefore, if the amount of liquid medicine remaining in the medicine bottle 2 is less than the predetermined injection dose, as shown in Figure 29, the distance of the stopper portion 804 at the rear end of the plunger 80 to the contact ring 41 on the rear side of the drive ring 50 becomes less than the stroke of the predetermined injection dose. For example, when the predetermined amount of injectable drug solution is 0.75 mg and the amount of drug solution remaining in the drug bottle 2 is 0.5 mg, the distance of the stopper portion 804 from the contact ring 41 on the rear side of the drive ring 50 corresponds only to the stroke distance of an injection dose of 0.5 mg. Therefore, when the user rotates the dose adjustment knob 30 until the dose scale mark set 21 on the tubular member 20 moves from the "0.0 (mg)" scale to the "0.5 (mg)" scale and is in the position of the scale window 13, the contact ring 41 on the rear side of the drive ring 50 contacts the stopper portion 804 at the rear end of the plunger 80, causing a locking action in the stopper portion 804. As a result, the user is unable to rotate the dose adjustment knob 30 any further until the "0.75 (mg)" scale on the tubular member 20 aligns with the scale window 13.

[0058] Similarly, as shown in Figures 23 and 30, when the liquid medicine in the medicine bottle 2 is used up, the stopper portion 804 at the rear end of the plunger 80 also locks the contact ring 41 on the rear side of the drive ring 50, preventing the user from rotating the dose adjustment knob 30 any further. When the liquid medicine in the medicine bottle 2 is used up, the needle protection cover 6A is placed over the outside of the needle 5, the needle 5 is safely removed from the front end of the medicine bottle sleeve 3, the protective cap 4 is placed over the outside of the medicine bottle sleeve 3, and the syringe is discarded together with the empty medicine bottle 2. The number of uses of the syringe is limited, and the safety of syringe use is ensured.

[0059] The above description is merely one embodiment of the present invention and does not impose any formal limitations on the present invention. Although the present invention has already disclosed embodiments as described above, this does not limit the present invention. Those skilled in the art can implement equivalent embodiments by making some changes or modifications to the disclosed technical content, without departing from the technical solution of the present invention. However, any modifications, equivalent changes, and modifications made to the above embodiments based on the technical substance of the present invention, without departing from the technical solution of the present invention, are all within the scope of the technical solution of the present invention.

Claims

1. An injection mechanism with a dose adjustment function that can be fitted with a drug vial, The injection mechanism is A hollow housing and A plunger mounted within the housing and driven to move forward along the axial direction to perform an injection action into the medicine bottle, An injection dose adjustment means that can be connected to the plunger, A tubular member is mounted in the housing so as to be rotatable and movable back and forth, and the plunger is positioned inside it, A dosage adjustment knob is rotatably attached to the rear end of the housing and connected to the tubular member so as to be able to move toward and away from it, and while connected to the tubular member, the tubular member can be rotated. A drive ring is installed inside the tubular member and is screwed onto the plunger, An elastic means provided within the tubular member and positioned between the drive ring and the tubular member, which applies elastic force to connect the tubular member to the dose adjustment knob, wherein when the dose adjustment knob rotates the tubular member, the elastic means generates elastic potential energy through the action of the drive ring, An injection dose adjustment means including: an injection dose adjustment means, which includes a pressing member attached to the rear end of the dose adjustment knob, which triggers the tubular member to move away from the dose adjustment knob, thereby driving the plunger to move forward in a spiral motion by releasing the elastic potential energy of the elastic means and pushing the drive ring; An injection mechanism with an injection dose adjustment function, comprising: a release control means attached inside the front end of the housing, which restricts the position of the plunger when the dose adjustment knob rotates the tubular member, and which is connected to the tubular member when the tubular member is triggered to move away from the dose adjustment knob, wherein after the plunger completes the injection operation, the elastic means drives the tubular member away from the release control means and back to its original position.

2. The housing has a scale window, and a plurality of volume scales are arranged in an annular pattern on the outer circumferential surface of the tubular member. With the tubular member connected to the dose adjustment knob, the dose adjustment knob is rotated to move one of the dose scales on the tubular member to the scale window. The injection mechanism with injection dose adjustment function according to claim 1, wherein when the dose adjustment knob is rotated to move the dose scale of the tubular member to the scale window, the elastic means generates the elastic potential energy corresponding to the dose scale by the action of the drive ring, and the recoil control means restricts the position of the plunger.

3. The outer circumferential surface of the plunger has forward-direction helical guide grooves and reverse-direction helical guide grooves, and the rear end of the plunger, located behind the drive ring, has a stopper portion. The drive ring has a forward spiral portion formed therein that is screwed into the forward spiral guide groove. The aforementioned passing control means is A separation control ring is attached to the front side of the tubular member and the drive ring, wherein a reverse-direction helical portion is formed in the separation control ring, the reverse-direction helical portion and the forward-direction helical portion for plunger drive are helical portions with opposite helices, the plunger is screwed into the separation control ring, the reverse-direction helical portion is screwed into the reverse-direction helical guide groove, and the separation control ring is able to separate relative to the tubular member being operated. An injection mechanism with injection dose adjustment function according to claim 2, comprising a connecting member attached to the inside of the front end of the housing and positioned in front of the separation control ring, and which restricts the separation control ring to be driven in reverse rotation only at a fixed point, the connecting member having a central hole and a forward-facing screw portion located in the central hole, the plunger being screwed into the connecting member and the forward-facing screw portion being screwed into the forward-facing helical guide groove.

4. The injection mechanism with injection dose adjustment function according to claim 3, wherein the forward spiral guide groove and the reverse spiral guide groove have the same spiral pitch.

5. The injection mechanism with injection dose adjustment function according to claim 3, wherein the forward spiral guide groove and the reverse spiral guide groove have different spiral pitches.

6. The inner circumferential surface of the front end of the tubular member is formed with a plurality of alignment locking grooves extending from front to rear and at least one movable guide groove. The outer circumferential surface of the drive ring has at least one axial guide portion positioned in the movement guide groove of the tubular member, and the drive ring is movable back and forth within the tubular member. Multiple alignment locking teeth and multiple elastic locking bodies are formed on the outer circumferential surface of the separation control ring, and the opposing locking teeth of the separation control ring can relatively engage with the alignment locking groove inside the front end of the tubular member. The injection mechanism with injection dose adjustment function according to claim 3, wherein a plurality of unidirectional ratchets are formed in an annular shape on the inner circumferential surface of the connecting member, the front end of the coupling / uncoupling control ring is pivotally mounted within the connecting member, and the elastic locking body of the coupling / uncoupling control ring can be locked in the unidirectional ratchet, and restricts the coupling / uncoupling control ring to be driven in reverse rotation only at fixed points.

7. An injection mechanism with injection dose adjustment function according to claim 1, wherein a contact ring is attached to the front end of the elastic means, the contact ring is fitted to the outside of the plunger, and the elastic means is connected to the rear end of the drive ring by contact with the contact ring.

8. The injection mechanism with injection dose adjustment function according to claim 7, wherein the elastic means is a compression spring, and when the dose adjustment knob rotates the tubular member, the elastic means is compressed via the contact ring by the action of the drive ring to store the elastic potential energy.

9. Multiple housing wall-engaging teeth are formed on the inner circumferential surface of the rear end of the housing, arranged in an annular pattern at equal angles. The outer circumferential surface of the rear end of the tubular member is provided with a plurality of locking teeth extending in a convex shape toward the rear, and at least one guide block located in front of the locking teeth, the guide block being able to mesh with the housing wall meshing teeth inside the rear end of the housing, The injection mechanism with injection dose adjustment function according to any one of claims 1 to 8, wherein the dose adjustment knob is provided with an inner ring plate and a plurality of interlocking teeth arranged in a ring shape on the front surface of the inner ring plate, and the interlocking teeth of the dose adjustment knob can engage with the interlocking teeth of the tubular member relative to each other.

10. An injection mechanism with an injection dose adjustment function according to any one of claims 1 to 9, A syringe with an injection dose adjustment function, comprising a medicine bottle sleeve that can be fitted onto the outside of the medicine bottle and attached to the front end of the housing.

11. A syringe with an injection dose adjustment function according to claim 10, wherein at least one medicine bottle window is formed in the peripheral wall of the medicine bottle sleeve, the state of the medicine liquid inside the medicine bottle can be observed through the bottle window, the front end of the medicine bottle sleeve has an injection needle connection end, an injection needle can be attached to the injection needle connection end, and the injection needle passes through the front end of the medicine bottle sleeve and is punctured and inserted into the medicine bottle.

12. The front end connection portion of the housing has a plurality of annular grooves formed on the inner circumferential surface of the housing wall of the housing and arranged at intervals in the front-rear direction, and a plurality of grooves parallel to the central axis of the injection mechanism. The syringe with injection dose adjustment function according to claim 10 or 11, wherein the rear end of the medicine bottle sleeve has an assembly end, the shape of the outer circumferential surface of the assembly end matches the shape of the inner circumferential surface of the housing wall at the front end connection portion of the housing, and the assembly end of the rear end of the medicine bottle sleeve is detachably attached inside the front end connection portion of the housing.

Images