CN117563086B - Injection pen - Google Patents

Injection pen Download PDF

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Publication number
CN117563086B
CN117563086B CN202410058059.XA CN202410058059A CN117563086B CN 117563086 B CN117563086 B CN 117563086B CN 202410058059 A CN202410058059 A CN 202410058059A CN 117563086 B CN117563086 B CN 117563086B
Authority
CN
China
Prior art keywords
button
clamping
injection pen
assembly
power rod
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202410058059.XA
Other languages
Chinese (zh)
Other versions
CN117563086A (en
Inventor
熊长艳
李化顺
何四现
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Suzhou Jiashu Medical Technology Co ltd
Original Assignee
Suzhou Jiashu Medical Technology Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Suzhou Jiashu Medical Technology Co ltd filed Critical Suzhou Jiashu Medical Technology Co ltd
Priority to CN202410058059.XA priority Critical patent/CN117563086B/en
Publication of CN117563086A publication Critical patent/CN117563086A/en
Application granted granted Critical
Publication of CN117563086B publication Critical patent/CN117563086B/en
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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178—Syringes
    • A61M5/31—Details
    • A61M5/315—Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms
    • A61M5/31533—Dosing mechanisms, i.e. setting a dose
    • A61M5/31545—Setting modes for dosing
    • A61M5/31548—Mechanically operated dose setting member
    • A61M5/3155—Mechanically operated dose setting member by rotational movement of dose setting member, e.g. during setting or filling of a syringe
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178—Syringes
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178—Syringes
    • A61M5/31—Details
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178—Syringes
    • A61M5/31—Details
    • A61M5/315—Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178—Syringes
    • A61M5/31—Details
    • A61M5/315—Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms
    • A61M5/31525—Dosing
    • A61M5/31528—Dosing by means of rotational movements, e.g. screw-thread mechanisms
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178—Syringes
    • A61M5/31—Details
    • A61M5/315—Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms
    • A61M5/31533—Dosing mechanisms, i.e. setting a dose
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/178—Syringes
    • A61M5/20—Automatic syringes, e.g. with automatically actuated piston rod, with automatic needle injection, filling automatically
    • A61M2005/2026—Semi-automatic, e.g. user activated piston is assisted by additional source of energy

Abstract

The application discloses an injection pen, which comprises a button mechanism and a dose adjusting mechanism, wherein the button mechanism comprises a button assembly, the button assembly comprises a button body and a button cover, and the button body is detachably connected with the button cover; the dose adjustment mechanism comprises a power lever; the button body comprises a downward extending clamping part, and the clamping part is provided with an upward first limiting surface; the power rod comprises an upward extending clamping hook part, and the clamping hook part is provided with a downward second limiting surface; the button cover comprises a column part extending downwards, and the column part can be inserted into the inner side of the clamping hook part to push the clamping hook part outwards along the radial direction, so that the first limiting surface and the second limiting surface are kept in an abutting state. By optimizing the mating structure of the button mechanism and the dose setting mechanism, the reliability of the connection of the button mechanism and the dose setting mechanism can be ensured.

Description

Injection pen
Technical Field
The application relates to the technical field of medical instruments, in particular to an injection pen.
Background
Insulin injection therapy is the most commonly used treatment for clinical work, with the consequent generation of an injection pen for injecting insulin, which can be used repeatedly, and which allows precise adjustment of the injection dose, requiring only replacement of the cartridge containing the insulin. In addition to insulin injection, the injection pen may also be used for injection of other drugs.
In the related art, an injection pen comprises an upper pen container assembly and a lower pen cap, wherein the upper pen container assembly comprises a button mechanism, a dose adjusting mechanism and a transmission mechanism, and the lower pen cap is used for installing a clip type bottle; the kinetic energy can be stored by operating the dose adjusting mechanism, the kinetic energy stored by the dose adjusting mechanism can be released under the pressing operation of the button mechanism, and the bottle stopper of the card bottle is pushed by the transmission mechanism so as to realize the injection of the medicine.
In practical application, the matching structure of the existing button mechanism and the dosage adjusting mechanism is easy to loosen, and the button of the button mechanism is easy to loosen, so that the injection pen cannot be used.
Disclosure of Invention
The aim of the application is to provide an injection pen, which can ensure the connection reliability of a button mechanism and a dose adjusting mechanism through optimizing the matching structure of the button mechanism and the dose adjusting mechanism.
In order to solve the technical problems, the application provides an injection pen, which comprises a button mechanism and a dose adjusting mechanism, wherein the button mechanism comprises a button assembly, the button assembly comprises a button body and a button cover, and the button body is detachably connected with the button cover; the dose adjustment mechanism comprises a power lever;
the button body comprises a downward extending clamping part, and the clamping part is provided with an upward first limiting surface; the power rod comprises an upward extending clamping hook part, and the clamping hook part is provided with a downward second limiting surface;
the button cover comprises a column part extending downwards, and the column part can be inserted into the inner side of the clamping hook part to push the clamping hook part outwards along the radial direction, so that the first limiting surface and the second limiting surface are kept in an abutting state.
In an implementation manner, the power rod is provided with more than two clamping hook parts, and the clamping hook parts are distributed at intervals along the circumferential direction; the clamping hook comprises a rod part and a hook part arranged at the top end of the rod part, and the top end of the rod part extends outwards along the radial direction to form the hook part.
In one implementation manner, the bottom ends of the rod parts of the clamping hook parts are connected into a whole through a connecting part, and the top section of the rod part has elastic deformation capability in the radial direction.
In one embodiment, the rod portion has an inclined guide surface at the top end of the inner wall for guiding the insertion of the column portion.
In one implementation, each hook portion is arranged around a central axis of the power rod; the central axis of the column part coincides with the central axis of the power rod.
In an implementation manner, the middle area of the button body is recessed downwards to form the clamping portion, the clamping portion is provided with a through hole for the clamping hook portion to pass through, and the first limiting surface is an annular surface.
In one implementation, the post is hollow.
In an implementation manner, the button body and the button cover are detachably connected in a clamping manner.
In an achievable mode, the injection pen further comprises a knob assembly, a circumferential limiting structure is arranged between the knob assembly and the power rod, and the knob assembly can drive the power rod to rotate through the circumferential limiting structure when rotating;
the button assembly is in sliding connection with the knob assembly along the axial direction, and the button assembly can drive the power rod to move downwards to release the circumferential limit of the power rod and the knob assembly when moving downwards relative to the knob assembly.
In one implementation, the button mechanism further includes a return spring disposed between the button assembly and the knob assembly.
After the scheme is adopted, the clamping hook part of the power rod can extend into the clamping connection part of the button body, and after the button cover is detachably connected with the button body, the column part of the button cover can be inserted into the inner side of the clamping hook part to push the clamping hook part outwards along the radial direction, so that the second limiting surface of the clamping hook part is in abutting connection with the first limiting surface of the clamping connection part. Therefore, under the cooperation of the clamping part and the clamping hook part, the relative position of the button body and the power rod in the axial direction is limited, and when the button assembly is pressed downwards, the power rod can be driven to move downwards together. Meanwhile, the column part of the button cover is inserted into the inner side of the clamping hook part, so that the clamping hook part and the clamping joint part are always kept in an abutting state, the reliability of limiting the power rod and the button assembly in the axial direction is ensured, and the condition that the clamping hook part of the power rod is separated from the clamping joint part can be effectively prevented.
Drawings
FIG. 1 is a schematic diagram of an injection pen according to an embodiment of the present disclosure;
FIG. 2 is a schematic cross-sectional view of the injection pen of FIG. 1;
FIG. 3 is an enlarged view of a portion of the area of the upper barrel assembly of FIG. 2;
FIG. 4 is a schematic cross-sectional view of an assembled button assembly and power lever in an exemplary embodiment;
FIG. 5 is an enlarged view of a portion of the portion A of FIG. 4;
FIG. 6 is a schematic view of a button body according to an embodiment;
FIG. 7 is a schematic cross-sectional view of the button body of FIG. 6;
FIG. 8 is a schematic view of the button cover in one view of the embodiment;
FIG. 9 is a schematic view of the button cover in another view of the embodiment;
fig. 10 is a schematic structural view of a power lever in an embodiment.
Reference numerals illustrate:
an injection pen 100, an upper barrel assembly 10, a lower cap assembly 20;
an upper barrel 11, a display window 111;
the button mechanism 12, the button body 121, the clamping part 1211, the first limiting surface 12111, the through hole 1212, the bayonet 1213, the boss 1214, the button cover 122, the column part 1221, the buckle 1222, the notch 1223, and the reset elastic member 123;
dose-setting mechanism 13, knob assembly 131, knob 1311, stop support 1312, first ring gear portion 13121, power rod 132, first latch 1324, hook portion 1325, second stop face 13251, rod portion 13252, hook portion 13253, guide face 13254, aperture portion 1326, connection portion 1327, barrel 133, ball 134, sleeve 135, torsion spring 136, torsion spring support 137, dial 138;
the driving mechanism 14, the driving wheel 141, the screw 142 and the bottle holder cover 143;
a lower pen cap 21, a bottle holder 22, a snap-on bottle 23, and a bottle stopper 231.
Detailed Description
The embodiment of the application provides an injection pen, through the optimization to the cooperation structure of button mechanism and dose adjustment mechanism, can ensure the reliability that button mechanism and dose adjustment mechanism connect to do benefit to the reliability of use that promotes the injection pen.
In order to provide a better understanding of the present application, those skilled in the art will now make further details of the present application with reference to the drawings and detailed description.
The side of the button mechanism of the injection pen is defined as the upper side, correspondingly, the side of the injection end of the injection pen or the side close to the injection part during use is the lower side, the length direction of the injection pen is defined as the axis direction, the side close to the center of the injection pen is the inner side, and correspondingly, the side far from the center of the injection pen is the outer side. It is to be understood that the terminology used is for the purpose of describing and understanding only and is not intended to limit the scope of protection.
Referring to fig. 1 to 3, fig. 1 is a schematic structural diagram of an injection pen according to an embodiment provided in the present application; FIG. 2 is a schematic cross-sectional view of the injection pen of FIG. 1; fig. 3 is a partial enlarged view of the area of the upper barrel assembly of fig. 2.
In this embodiment, the injection pen 100 includes an upper barrel assembly 10 and a lower cap assembly 20.
The upper barrel assembly 10 includes an upper barrel 11, a button mechanism 12, a dose setting mechanism 13, and a transmission mechanism 14, the upper barrel 11 serving as a mounting base for the button mechanism 12, the dose setting mechanism 13, and the transmission mechanism 14.
The lower pen cap assembly 20 comprises a lower pen cap 21, a bottle support 22 and a clamp type bottle 23, wherein the bottle support 22 is inserted into the lower pen cap 21 and used for installing the clamp type bottle 23, the upper end of the bottle support 22 extends out of the lower pen cap 21 and is used for being sleeved and matched with the upper pen container 11, and the lower end of the upper pen container 11 is sleeved at the upper end of the bottle support 22.
The transmission mechanism 14 in the upper pen container 11 can be matched with the bottle stopper 231 of the cartridge 23, and the dose adjusting mechanism 13 can provide driving force to the transmission mechanism 14, so that the transmission mechanism 14 pushes the bottle stopper 231 to move downwards to realize medicine injection.
It should be noted that the cartridge 23 is a container for storing a medicine, and is not essentially a component of the injection pen 100, and is used in cooperation with the injection pen 100. In use, the cartridge 23 is a replaceable component.
In this embodiment, the dose adjustment mechanism 13 includes a knob assembly 131, a power rod 132, a barrel 133, a ball 134, a sleeve 135, and a torsion spring 136.
A circumferential limit structure is arranged between the power rod 132 and the knob assembly 131. The power lever 132 can also be moved in the axial direction by the aforementioned button mechanism 12 to release the circumferential limit state with the knob assembly 131 or to restore the circumferential limit state with the knob assembly 131. Specifically, the power rod 132 may be moved downward in the axial direction to release the circumferential limit with the knob assembly 131, and the power rod 132 may be reset, i.e., moved upward in the axial direction to restore the circumferential limit with the knob assembly 131 after being moved downward in the axial direction. Axial movement of the power lever 132 may be accomplished by operating the push button mechanism 12.
The power rod 132 is inserted into the cylinder 133, and a spiral passage extending in the axial direction of the power rod 132 is formed between the inner cylinder wall of the cylinder 133 and the outer cylinder wall of the power rod 132, and the ball 134 is rollably provided in the spiral passage, wherein the axial direction of the power rod 132 coincides with the axial direction of the injection pen 100.
Barrel 133 is fixed relative to upper barrel 11 in the circumferential direction; the upper end of the torsion spring 136 is relatively fixed with the upper barrel 11, and the lower end of the torsion spring 136 is connected with the sleeve 135.
The power rod 132 and the sleeve 135 are relatively fixed, in other words, the power rod 132 and the sleeve 135 cannot rotate relatively, and can rotate together.
The sleeve 135 and the transmission mechanism 14 can be switched between a transmission engaged state and a transmission disengaged state, in other words, when the sleeve 135 and the transmission mechanism 14 are in a transmission engaged state, power transmission can be realized therebetween, and when the sleeve 135 and the transmission mechanism 14 are in a transmission disengaged state, power transmission cannot be performed therebetween.
In particular arrangements, engagement and disengagement of the sleeve 135 with the transmission 14 is achieved by axial movement of the sleeve 135.
In particular embodiments, the drive mechanism 14 includes a drive wheel 141, a screw 142, and a bottle holder cover 143. The driving wheel 141 can be engaged with or separated from the sleeve 135, the screw 142 is limited in the circumferential direction with the driving wheel 141 and is in threaded connection with the bottle holder cover 143, the lower end of the screw 142 penetrates through the bottle holder cover 143 to be abutted with the bottle stopper 231, and a gasket is generally arranged between the screw 142 and the bottle stopper 231.
A clutch structure is provided between the driving wheel 141 and the sleeve 135, and the clutch structure can enable the sleeve 135 to be in an engaged state with the driving wheel 141 when the sleeve 135 moves downwards in the axial direction, so that the sleeve 135 can drive the driving wheel 141 to rotate together, and can enable the sleeve 135 to be in a separated state with the driving wheel 141 when the sleeve 135 moves upwards in the axial direction, so that the rotation of the sleeve 135 does not affect the driving wheel 141.
Because the sleeve 135 is relatively fixed with the power rod 132, when the button mechanism 12 is operated, the power rod 132 and the sleeve 135 can be driven to move downwards along the axial direction, so that the transmission engagement of the sleeve 135 and the driving wheel 141 is realized, and under the action of the button mechanism 12, the power rod 132 and the sleeve 135 also move upwards along the axial direction, so that the separation of the sleeve 135 and the driving wheel 141 is realized.
Fig. 2 and 3 show the structure of the injection pen 100 in a normal state, and the normal states mentioned above refer to the relative positional relationship of the structures of the injection pen 100 when the injection pen 100 is not operated.
In particular embodiments, the button mechanism 12 includes a button assembly and a return spring 123, the return spring 123 being disposed between the button assembly and the knob assembly 131, the knob assembly 131 being axially positioned relative to the injection pen 100. The power rod 132 and the sleeve 135 are driven to move downwards along the axial direction by pressing the button assembly, in the process, the reset elastic member 123 is compressed and stored, and after the pressing force to the button assembly is cancelled, the power rod 132 and the sleeve 135 can move upwards along the axial direction to reset under the action of the reset elastic force of the reset elastic member 123.
In a specific implementation, the dose adjusting mechanism 13 further comprises a dial 138, the dial 138 is sleeved on the sleeve 135, the sleeve 135 is in circumferential limiting connection with the dial 138, the outer side of the dial 138 is provided with an upper pen container 11, and the upper pen container 11 is provided with a display window 111. When adjusting a dose, the dial 138 may be rotated with the sleeve 135 so that the user may determine the size of the dose to be adjusted by displaying a scale on the dial 138 displayed by the window 111.
In a specific implementation, the dose adjusting mechanism 13 of the injection pen 100 further includes a torsion spring bracket 137, the torsion spring bracket 137 is relatively fixed to the upper pen container 11, and an upper end of the torsion spring 136 may be specifically connected to the torsion spring bracket 137. Barrel 133 is nested within torsion spring bracket 137, and barrel 133 may be secured relative to upper barrel 11 by a relative fixation to torsion spring bracket 137.
The relative fixing mode of the torsional spring bracket 137 and the upper pen container 11 and the relative fixing mode of the barrel 133 and the torsional spring bracket 137 can adopt the modes of clamping structure, clamping and the like, so that the assembly and the disassembly are convenient, and the maintenance is facilitated.
In particular, a limiting structure is disposed between the knob assembly 131 and the torsion spring bracket 137, wherein the limiting structure is configured such that the knob assembly 131 can only rotate in one direction relative to the torsion spring bracket 137, but cannot rotate in the opposite direction. In the structural configuration of the injection pen 100, i.e., the knob assembly 131 is rotatable relative to the torsion spring bracket 137 in a direction to adjust a dose, but is not rotatable in a direction opposite to adjust the dose.
Illustratively, the spacing structure between the knob assembly 131 and the torsion spring bracket 137 may be a one-way ratchet-ratcheting structure.
The rotation in the direction of the dose adjustment will be referred to as forward rotation and the rotation opposite to the direction of the dose adjustment will be referred to as reverse rotation.
The medication injection operation of the injection pen 100 may be divided into a dose adjustment phase and an injection phase.
In the dosage adjustment stage, the user can rotate the knob assembly 131 forward to drive the power rod 132 to rotate, and the power rod 132 drives the sleeve 135 and the torsion spring 136 to rotate together, so that the torsion spring 136 stores energy; in this process, the adjusted dose can be judged through the display window 111 of the upper barrel 11; after the dosage is adjusted and the force applied to the knob assembly 131 is removed, the knob assembly 131 can be maintained at this position by the limiting structure between the knob assembly 131 and the torsion spring bracket 137, and accordingly, the power rod 132, the sleeve 135 and the torsion spring 136, which are circumferentially limited to the knob assembly 131, are maintained at this position.
In the injection stage, the button assembly of the button mechanism 12 is pressed downwards to push the power rod 132 to move downwards along the axial direction, the power rod 132 drives the sleeve 135 to move downwards together to enable the sleeve 135 to be engaged with the driving wheel 141 of the transmission mechanism 14, meanwhile, the power rod 132 is separated from the circumferential limit of the stop support 1312, in this way, the energy storage of the torsion spring 136 is released, under the action of the energy storage released by the torsion spring 136, the sleeve 135 and the power rod 132 rotate reversely together to rotate together with the driving wheel 141 engaged with the sleeve 135 to drive the screw 142 to rotate together, and when the screw 142 rotates, the screw 142 also moves downwards along the axial direction under the threaded fit of the screw 142 and the bottle rack cover 143 to push the bottle stopper 231 to realize medicine injection.
The button assembly of the button mechanism 12 is in limited connection with the power rod 132 in the axial direction, so that when the button assembly is pressed, the button assembly can drive the power rod 132 to move downwards along the axial direction. The focus is herein on the improvement of the connection structure of the button assembly and the power lever 132 to ensure the reliability of the connection of the two. This is emphasized below.
Referring to fig. 4 to 10, fig. 4 is a schematic cross-sectional view of the button assembly and the power lever after assembly according to the embodiment; FIG. 5 is an enlarged view of a portion of the portion A of FIG. 4; FIG. 6 is a schematic view of a button body according to an embodiment; FIG. 7 is a schematic cross-sectional view of the button body of FIG. 6; FIG. 8 is a schematic view of the button cover in one view of the embodiment; FIG. 9 is a schematic view of the button cover in another view of the embodiment; fig. 10 is a schematic structural view of a power lever in an embodiment.
In the present embodiment, the button assembly of the button mechanism 12 includes a button body 121 and a button cover 122, and the button body 121 and the button cover 122 are detachably connected.
The button body 121 includes a downward extending clamping portion 1211, the clamping portion 1211 having an upward facing first stop surface 12111; the power lever 132 includes an upwardly extending hook portion 1325, the hook portion 1325 having a downwardly facing second stop surface 13251.
The button cover 122 includes a downward extending pillar portion 1221, and the pillar portion 1221 can be inserted into the inner side of the hook portion 1325 to push the hook portion 1325 radially outward, so that the second limiting surface 13251 of the hook portion 1325 is kept in abutment with the first limiting surface 12111 of the engaging portion 1211. It will be appreciated that the hook 1325 has a space that is movable in the radial direction to ensure that the post 1221 can push the hook 1325 outward.
After the above-mentioned scheme is adopted, the hook portion 1325 of the power rod 132 can extend into the clamping portion 1211 of the button body 121, and after the button cover 122 is detachably connected with the button body 121, the column portion 1221 of the button cover 122 can be inserted into the inner side of the hook portion 1325 to push the hook portion 1325 radially outwards, so that the second limiting surface 13251 of the hook portion 1325 and the first limiting surface 12111 of the clamping portion 1211 maintain an abutting state. Thus, the cooperation of the engaging portion 1211 and the hook portion 1325 limits the relative positions of the button body 121 and the power lever 132 in the axial direction, and when the button assembly is pressed down, the power lever 132 is driven to move down together. Meanwhile, the column portion 1221 of the button cover 122 is inserted inside the hook portion 1325, so that the hook portion 1325 and the clamping portion 1211 can be kept in a contact state all the time, thereby ensuring the reliability of limiting the power rod 132 and the button assembly in the axial direction, and effectively preventing the hook portion 1325 of the power rod 132 from being separated from the clamping portion 1211.
In a specific implementation, the power rod 132 is provided with more than two hook portions 1325, and the hook portions 1325 are arranged at intervals along the circumferential direction; each hook 1325 includes a stem 13252 and a hook 13253 disposed at a top end of the stem 13252, and the top end of the stem 13252 extends radially outward to form the hook 13253; the hook portions 1325 are surrounded by a hole 1326, and when the button cover is assembled, the column portion 1221 of the button cover 122 can be inserted into the hole 1326 surrounded by the hook portions 1325, so as to push all the rod portions 13252 radially outwards, so that all the hook portions 13253 can abut against the clamping portion 1211 to limit.
Specifically, when the power lever 132 is provided, the bottom ends of the hook portions 1325 are integrally connected by the connecting portion 1327, as can be understood with reference to fig. 10, so that the connection strength between the hook portions 1325 and the main body of the power lever 132 can be improved. A gap penetrating through the top end surface of the power rod 132 is arranged between two adjacent rod portions 13252, so that the top section of each rod portion 13252 is movable in the radial direction, and the column portion 1221 is convenient to push the rod portion 13252 to a position where the hook portion 13253 abuts against the clamping portion 1211.
Specifically, the top section of the rod portion 13252 has elastic deformation capability in the radial direction, so that on one hand, the problem that the structural strength is affected due to stress concentration of the rod portion 13252 caused by pushing of the column portion 1221 can be reduced, and on the other hand, the disassembly between the button mechanism 12 and the power rod 132 is facilitated, after the button cover 122 is disassembled, each rod portion 13252 is conveniently moved radially inwards to reset, the power rod 132 is facilitated to be separated from the button body 121, and thus the disassembly is facilitated without damaging the button mechanism 12.
In a specific implementation, the middle area of the button body 121 is recessed downward to form a clamping portion 1211, the clamping portion 1211 has a through hole 1212 through which the hook portion 1325 passes, and the first limiting surface 12111 of the clamping portion 1211 is an annular surface. In this way, the respective hook portions 1325 of the power lever 132 can be brought into contact with the first stopper surface 12111 after passing through the through holes 1212 of the engaging portions 1211 without adjusting the circumferential relative position between the power lever 132 and the button body 121 at the time of assembly.
In the illustrated example, the power lever 132 is provided with four hook portions 1325 arranged at intervals in the circumferential direction. In other implementations, the number of hooks 1325 can be adjusted as desired.
In a specific implementation, each hook 1325 is arranged around the central axis of the power rod 132, and the central axis of the column 1221 coincides with the central axis of the power rod 132. In this way, the balance of the thrust force applied to the radially outward movement of each hook portion 1325 by the column portion 1221 can be facilitated, and it can be ensured that each hook portion 1325 can maintain a good abutment state with the engaging portion 1211.
In a specific implementation, the top end of the inner wall of the rod portion 13252 of the hook portion 1325 has an inclined guiding surface 13254 to guide the insertion of the column portion 1221, so as to facilitate the insertion and assembly between the column portion 1221 and the power rod 132 when the button cover 122 is assembled.
In particular implementations, the post 1221 of the button cover 122 may be hollow in structure to save material and reduce the weight of the button cover 122.
In a specific implementation, the detachable connection between the button cover 122 and the button body 121 may adopt a clamping manner. Specifically, a bayonet 1213 may be disposed on the button body 121, a buckle 1222 capable of being clamped with the bayonet 1213 is disposed on the button cover 122, the button cover 122 may be buckled on the button body 121, and during buckling, the buckle 1222 of the button cover 122 may extend into the bayonet 1213 under the action of an external force and abut against the downward inner end surface of the button body 121, thereby limiting the relative positions of the button cover 122 and the button body 121.
In the illustrated example, four sets of mating tabs 1222 and bayonets 1213 are provided between the button cover 122 and the button body 121. When the four sets of mutually matched buckles 1222 and bayonets 1213 are arranged, the four sets of mutually matched buckles 1222 and bayonets 1213 can be uniformly distributed along the circumferential direction, so that the clamping force between the button cover 122 and the button body 121 is relatively uniform, and the connection firmness between the two sets of mutually matched buckles is improved.
In other implementations, the number of tabs 1222 and bayonets 1213 that mate between the button cover 122 and the button body 121 may be other numbers, such as two or three groups.
In other implementations, the engagement between the button cover 122 and the button body 121 may be implemented in other manners, for example, a fastening portion that can press down against the button cover 122 may be provided at an outer edge of the button body 121, and the fastening portion may rotate relative to the button body 121 to switch between a position of pressing against the button cover 122 and a position of releasing pressing against the button cover 122.
In this embodiment, a fool-proof structure may be further disposed between the button cover 122 and the button body 121, so as to facilitate identifying the circumferential relative position of the button cover 122 and the button body 121 when assembled. It should be noted that, on the basis that the mating structure between the button cover 122 and the button body 121 is centered and symmetrical, the circumferential relative positions of the two do not affect the assembly of the two, and at this time, a foolproof structure may not be provided.
In one implementation, the fool-proof structure may include a notch 1223 formed on an outer edge of the button cover 122 and a boss 1214 disposed on an outer edge of the button body 121, where the notch 1223 is matched with the boss 1214, and when the button cover 122 is fastened to the button body 121, the boss 1214 is located in the notch 1223.
In this embodiment, to facilitate the pressing of the button assembly of the button mechanism 12, the button assembly and the knob assembly 131 are slidably connected in the axial direction. The reset spring 123 of the button mechanism 12 is disposed between the button assembly and the knob assembly 131.
The return elastic member 123 may be a spring or the like.
In this embodiment, the knob assembly 131 includes a knob 1311 and a stopper support 1312, where the knob 1311 is in circumferential limit connection with the stopper support 1312, a portion of the stopper support 1312 is sleeved on the knob 1311, and a lower end of the knob 1311 is rotatably sleeved on the upper barrel 11.
In one implementation, the power rod 132 passes through the stop support 1312, and a circumferential limit structure is provided between the stop support 1312.
Specifically, the circumferential limit structure between the stop support 1312 and the power lever 132 includes a first ring gear portion 13121 provided at the stop support 1312, and a first latch 1324 provided at an outer lever wall of the power lever 132. Normally, the first latch 1324 of the power lever 132 may be embedded in the tooth groove of the first ring gear 13121, so as to limit the circumferential positions of the power lever 132 and the stop support 1312, so that the stop support 1312 may rotate together when rotating.
In practice, the number of first latches 1324 of the power lever 132 may be set as desired, such as two or three or more. The first plurality of latches 1324 are preferably circumferentially and evenly arranged to equalize the force between the power rod 132 and the stop support 1312.
In other implementations, a circumferential limit feature may also be provided between the power rod 132 and the knob 1311.
In use, a user may rotate the stop support 1312 and the power lever 132 together by turning the knob 1311 to achieve dose adjustment.
Specific examples are set forth herein to illustrate the principles and embodiments of the present application, and the description of the examples above is only intended to assist in understanding the methods of the present application and their core ideas. It should be noted that it would be obvious to those skilled in the art that various improvements and modifications can be made to the present application without departing from the principles of the present application, and such improvements and modifications fall within the scope of the claims of the present application.

Claims (8)

1. An injection pen comprising a button mechanism and a dose adjustment mechanism, wherein the button mechanism comprises a button assembly, the button assembly comprises a button body and a button cover, and the button body and the button cover are detachably connected; the dose adjustment mechanism comprises a power lever;
the button body comprises a downward extending clamping part, and the clamping part is provided with an upward first limiting surface; the power rod comprises an upward extending clamping hook part, and the clamping hook part is provided with a downward second limiting surface;
the button cover comprises a column part extending downwards, and the column part can be inserted into the inner side of the clamping hook part to push the clamping hook part outwards along the radial direction, so that the first limiting surface and the second limiting surface are kept in an abutting state;
the injection pen further comprises a knob assembly, a circumferential limiting structure is arranged between the knob assembly and the power rod, and the knob assembly can drive the power rod to rotate through the circumferential limiting structure when rotating;
the button assembly is in sliding connection with the knob assembly along the axial direction, and can drive the power rod to move downwards when moving downwards relative to the knob assembly so as to release the circumferential limit of the power rod and the knob assembly;
the button mechanism further comprises a reset elastic piece, and the reset elastic piece is arranged between the button assembly and the knob assembly.
2. The injection pen according to claim 1, wherein the power rod is provided with more than two clamping hook parts, and the clamping hook parts are arranged at intervals along the circumferential direction; the clamping hook comprises a rod part and a hook part arranged at the top end of the rod part, and the top end of the rod part extends outwards along the radial direction to form the hook part.
3. The injection pen according to claim 2, wherein the bottom end of the stem portion of each of the hooking portions is integrally connected by a connecting portion, and a top section of the stem portion has elastic deformability in a radial direction.
4. The injection pen according to claim 2, wherein an inner wall tip of the shaft portion has an inclined guide surface for guiding insertion of the post portion.
5. The injection pen according to any one of claims 2 to 4, wherein each of the hooking portions is arranged around a central axis of the power rod; the central axis of the column part coincides with the central axis of the power rod.
6. The injection pen according to any one of claims 1 to 4, wherein the middle region of the button body is recessed downward to form the clamping portion, the clamping portion has a through hole for the hook portion to pass through, and the first limiting surface is an annular surface.
7. The injection pen according to any one of claims 1 to 4, wherein the post is hollow.
8. The injection pen according to any one of claims 1 to 4, wherein the button body and the button cover are detachably connected by a snap-fit manner.
CN202410058059.XA 2024-01-16 2024-01-16 Injection pen Active CN117563086B (en)

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WO2022217875A1 (en) * 2021-04-16 2022-10-20 山东威高普瑞医药包装有限公司 Multi-dose adjustable pre-charge injection pen
CN219814897U (en) * 2023-04-23 2023-10-13 深圳惠迈智能科技有限公司 Adjustable injection pen
CN219835963U (en) * 2023-05-19 2023-10-17 苏州嘉树医疗科技有限公司 Adjustable automatic injection device

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US20230398309A1 (en) * 2022-06-10 2023-12-14 Medmix Switzerland Ag Dose delivery mechanism

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW201303171A (en) * 2011-02-18 2013-01-16 Sanofi Aventis Deutschland Detent mechanism
CN204249845U (en) * 2014-10-30 2015-04-08 奇瑞汽车股份有限公司 A kind of motor vehicle seat back regulating handle structure
CN105501088A (en) * 2016-01-15 2016-04-20 上海延锋江森座椅有限公司 Detachable unlocking button and application
JP2017126338A (en) * 2016-01-15 2017-07-20 アディエント・エンジニアリング・アンド・アイピー・ゲゼルシャフト・ミット・ベシュレンクテル・ハフツング Button assembly and removable unlock button, and application thereof
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CN112741939A (en) * 2021-01-19 2021-05-04 深圳惠迈智能科技有限公司 Injection pen
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CN219814897U (en) * 2023-04-23 2023-10-13 深圳惠迈智能科技有限公司 Adjustable injection pen
CN219835963U (en) * 2023-05-19 2023-10-17 苏州嘉树医疗科技有限公司 Adjustable automatic injection device

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