CN118079144A

CN118079144A - Automatic injection pen

Info

Publication number: CN118079144A
Application number: CN202410519304.2A
Authority: CN
Inventors: 朱晓健
Original assignee: Wuxi Naisi Life Technology Co ltd
Current assignee: Wuxi Naisi Life Technology Co ltd
Priority date: 2024-04-28
Filing date: 2024-04-28
Publication date: 2024-05-28
Anticipated expiration: 2044-04-28
Also published as: CN118079144B

Abstract

The invention relates to the technical field of medical appliances and discloses an automatic injection pen, which comprises a shell, a bracket, an injector, a plunger and a pushing mechanism, wherein the shell is provided with a first opening, the bracket is movably arranged in the shell, the injector is arranged in the shell and fixedly arranged on the bracket, the plunger comprises a cylinder and a pushing piece, the cylinder is arranged in the shell, a part of the cylinder stretches into the injector, the pushing piece is detachably connected to the peripheral wall of the cylinder, the pushing mechanism is arranged on the shell and is connected with the cylinder, the pushing mechanism is used for driving the cylinder to move towards the first opening along the axial direction of the cylinder, based on the fact that the plunger can push the injector to a preset position by the pushing piece, the needle head of the injector stretches out of the shell, at the moment, the pushing piece is separated from the cylinder, then the cylinder pushes the piston in the injector to move, and injection of the injector is completed, namely, when the automatic injection pen is not used, the injector is contained in the shell, and the subsequent automatic injection pen is not affected.

Description

Automatic injection pen

Technical Field

The invention relates to the technical field of medical appliances, in particular to an automatic injection pen.

Background

In the related art, an automatic injection pen comprises a shell, a propelling mechanism, a plunger and a syringe, wherein the propelling mechanism, the plunger and the syringe are arranged in the shell, the propelling mechanism is connected with the plunger, and the propelling mechanism is used for driving the plunger to move so as to enable the plunger to extend into the syringe and drive the piston in the plunger to move, and therefore the syringe can inject medicines to a target position; when the automatic injection pen is not in use, the injector is positioned in the shell so as to avoid exposing the needle of the injector, and based on the automatic injection pen, the plunger needs to push the injector to a preset position when in use, so that the needle of the injector can be inserted into a target part, namely, when the automatic injection pen is in use, the plunger needs to push the injector and the piston in the injector to move in sequence, and therefore, the structure of the plunger is related to whether the automatic injection pen can work smoothly.

Disclosure of Invention

The purpose of the invention is that: an automatic injection pen capable of working smoothly is provided.

In order to achieve the above object, the present invention provides an automatic injection pen comprising a housing having a first opening, a bracket movably provided in the housing and having a first position and a second position, a syringe fixedly provided in the housing and on the bracket, a plunger including a cylinder provided in the housing on a side of the bracket away from the first opening and partially protruding into the syringe, and a pushing member detachably connected to an outer peripheral wall of the cylinder, the pushing mechanism being provided on the housing and connected to the cylinder, the pushing mechanism for driving the cylinder to move toward the first opening in an axial direction thereof;

When the pushing mechanism drives the cylinder to move, the pushing piece pushes the bracket to move from the first position to the second position, the needle of the syringe extends out of the first opening, and then the pushing piece is separated from the cylinder, and the cylinder drives the piston in the syringe to move.

In a specific embodiment of the present invention, the outer circumferential wall of the column body has a clamping groove;

the pushing piece comprises a pushing main body and a clamping body which are connected with each other, the pushing main body is annular and is arranged on the periphery of the cylinder in a surrounding mode, and the clamping body is detachably clamped in the clamping groove.

In a specific embodiment of the present invention, the pushing member includes a pushing body and a weak body, wherein the pushing body is annular and is disposed around the circumference of the cylinder, the weak body is connected to the outer circumference of the cylinder, and the weak body can be separated from the cylinder under the action of external force.

In a particular embodiment of the invention, the peripheral wall of the cylinder is at a distance from the inner wall of the syringe barrel.

In a specific embodiment of the present invention, the automatic injection pen further includes a mounting member and a claw, the mounting member and the claw are fixedly disposed in the housing, the mounting member is located at one end of the housing opposite to the first opening, the claw is located at one side of the mounting member away from the first opening, the mounting member has a avoidance hole, and an axis of the avoidance hole is parallel to an axis of the cylinder;

The plunger also comprises a connecting piece, wherein the connecting piece is fixedly arranged on the peripheral wall of the cylinder, the connecting piece is positioned between the bracket and the mounting piece, and one end, far away from the first opening, of the cylinder is provided with a clamping part;

The shell is also provided with a second opening, and the first opening and the second opening are oppositely arranged; the pushing mechanism comprises a button and a first elastic piece, the button is arranged at one end of the shell opposite to the first opening, the button part extends into the shell through the second opening, and the button can move along the axial direction of the cylinder;

the cylinder passes through the avoidance hole, the clamping part is detachably clamped with the clamping jaw, two opposite ends of the first elastic piece are respectively contacted with the mounting piece and the connecting piece in the axial direction of the cylinder, the first elastic piece is used for driving the cylinder to move, and the button is used for pressing the clamping jaw so as to separate the clamping jaw from the clamping part.

In a specific embodiment of the present invention, the claw includes a first claw body, a second claw body and a third claw body which are sequentially connected, the first claw body is connected with the housing, the second claw body is plate-shaped, the second claw body is oblique to the axis of the column, one end of the second claw body is connected with the first claw body, the other end extends towards the first opening towards the center side of the housing, the third claw body is connected with one end of the second claw body away from the first claw body, and the third claw body is located on one side of the second claw body towards the center side of the housing;

the clamping part is an annular groove body, and the groove body is arranged around the outer peripheral wall of the column body;

The clamping jaws are arranged around the axis of the column body, two adjacent clamping jaws are arranged at intervals, the third jaw body of each clamping jaw is detachably clamped with the groove body, and the button is used for pressing the second jaw body.

In a specific embodiment of the present invention, the button includes a button body having a mounting groove and a pressing body connected to a bottom surface of the mounting groove, the housing is inserted into the mounting groove and an outer peripheral wall of the housing contacts a side surface of the mounting groove, the pressing body extends into the housing through the second opening, and the pressing body is used for pressing the claw.

In a specific embodiment of the present invention, the automatic injection pen further includes a limiting member disposed on an outer peripheral wall of the housing, and the limiting member is located at an end of the housing opposite to the first opening, and the limiting member is detachably contacted with the button body to limit movement of the button body.

In a specific embodiment of the present invention, the limiting member has an annular structure, one end of the housing connected to the limiting member is a cylindrical end, the limiting member is in threaded connection with the cylindrical end, and rotating the limiting member can separate the limiting member from the button body.

In a specific embodiment of the present invention, the automatic injection pen further includes positioning blocks, the positioning blocks are fixedly disposed on the inner wall of the housing, at least two positioning blocks are disposed, and all the positioning blocks are annularly arranged at intervals;

The bracket is provided with a positioning part, the positioning part comprises a positioning table, a connecting block, a first positioning pin, a second positioning pin and a first clamping block, the positioning table is connected with the bracket, one end of the connecting block is connected with the side surface of the positioning table, which is close to the first opening, the other end of the connecting block is connected with the first positioning pin and the second positioning pin, the first positioning pin and the second positioning pin extend towards the first opening and are distributed at intervals, and the side surface of the first positioning pin, the side surface of the second positioning pin, which is opposite to the first positioning pin, is provided with the first clamping block;

When the bracket is positioned at the first position, the first clamping blocks on the first positioning pins and the second positioning pins are respectively contacted with the adjacent two positioning blocks, and when the bracket is positioned at the second position, the connecting blocks are arranged between the adjacent two positioning blocks in a penetrating way, and the positioning table is contacted with the positioning blocks.

In a specific embodiment of the present invention, the automatic injection pen further includes a protecting sleeve and a second elastic member, the protecting sleeve is movably connected to one end of the bracket near the first opening, the protecting sleeve extends to the outside of the first opening, the needle of the injector extends into the protecting sleeve, and the second elastic member connects the protecting sleeve and the bracket to fix the protecting sleeve;

When the protective sleeve is stressed, the protective sleeve can retract towards the direction of the column body.

In a specific embodiment of the present invention, the automatic injection pen further includes a second clamping block, where the second clamping block is disposed on an inner wall of the housing and is located at an end of the housing near the first opening;

the outer wall of the protective sleeve is also provided with a strip-shaped clamping groove, the length direction of the clamping groove is parallel to the axial direction of the cylinder, and the length of the clamping groove is larger than the length of the second clamping block in the axial direction of the cylinder;

When the bracket is located at the first position, the second clamping block is located between the clamping groove and the first opening, the clamping groove and the second clamping block are axially distributed along the cylinder, and the second clamping block is used for being clamped at one end, close to the first opening, of the clamping groove, so that the protective sleeve is prevented from retracting towards the direction of the cylinder.

In a particular embodiment of the invention, the automatic injection pen further comprises a protective cap removably connected to the housing and covering the first opening.

In a specific embodiment of the invention, a first observation port is formed in the outer wall of the shell, a second observation port is formed in the bracket, the syringe is made of transparent material, and one end of the syringe close to the first opening corresponds to the second observation port;

when the bracket is positioned at the second position, the first observation port and the second observation port are opposite.

In a particular embodiment of the invention, the automatic injection pen further comprises a cushion pad disposed at an end of the carriage remote from the first opening;

The outer wall of the syringe needle cylinder, which is far away from one end of the first opening, is provided with a connecting lug, and the connecting lug is contacted with one side of the buffer pad, which is far away from the first opening.

Compared with the prior art, the automatic injection pen has the beneficial effects that:

The pushing piece is detachably connected to the column body, so that when the pushing mechanism drives the plunger to move, the plunger can push the injector to a preset position by the pushing piece, so that the needle head of the injector extends out of the shell, at the moment, the pushing piece is separated from the column body, and then the column body pushes the piston in the injector to move, so that the injector can complete injection work, namely, when the automatic injection pen is not used, the injector is contained in the shell and the injection work of the subsequent automatic injection pen is not influenced; in addition, because the injector is accommodated in the shell, the needle of the injector is not exposed, so that the automatic injection pen can not accidentally injure a user when not in use, and the potential safety hazard is reduced.

Drawings

FIG. 1 is a block diagram of an automatic injection pen according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view of an automatic injection pen with a carriage in a first position in accordance with an embodiment of the present invention;

FIG. 3 is a cross-sectional view of an automatic injection pen with the carriage in a second position in accordance with an embodiment of the present invention;

FIG. 4 is a block diagram of a plunger according to an embodiment of the present invention;

FIG. 5 is another block diagram of a plunger according to an embodiment of the present invention;

FIG. 6 is a block diagram of the cooperation of a bracket and a protective sleeve according to an embodiment of the present invention;

FIG. 7 is a block diagram of a housing according to an embodiment of the present invention;

fig. 8 is a view showing a structure of another angle of the housing according to the embodiment of the present invention.

In the figure, 1, a shell; 101. a first opening; 102. a second opening; 103. a first viewing port; 2. a bracket; 201. a second viewing port; 21. a positioning table; 22. a connecting block; 23. a first positioning pin; 24. a second positioning pin; 25. a first clamping block; 3. a syringe; 31. a connecting lug; 4. a plunger; 41. a column; 411. a clamping groove; 412. a clamping part; 42. a pushing member; 421. pushing the body; 422. a clamping body; 423. a weak body; 43. a connecting piece; 5. a propulsion mechanism; 51. a button; 510. a mounting groove; 511. a button body; 512. a pressing body; 52. a first elastic member; 6. a mounting member; 601. avoidance holes; 7. a limiting piece; 8. a protective sleeve; 801. a clamping groove; 9. a second elastic member; 10. a protective cap; 11. a cushion pad; 100. a claw; 1001. a first claw body; 1002. a second claw body; 1003. a third jaw body; 200. a positioning block; 300. and a second clamping block.

Detailed Description

The following describes in further detail the embodiments of the present invention with reference to the drawings and examples. The following examples are illustrative of the invention and are not intended to limit the scope of the invention.

In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present application, the meaning of "plurality" means two or more, unless specifically defined otherwise.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; the connection may be mechanical connection, direct connection or indirect connection through an intermediate medium, and may be internal connection of two elements or interaction relationship of two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present application, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is less level than the second feature.

As shown in fig. 1 to 8, an automatic injection pen according to an embodiment of the present invention includes a housing 1 having a first opening 101, a bracket 2, a syringe 3, a plunger 4, and a pushing mechanism 5, the bracket 2 is movably provided in the housing 1 and has a first position and a second position, the syringe 3 is provided in the housing 1 and is fixedly provided on the bracket 2, the plunger 4 includes a cylinder 41 and a pushing member 42, the cylinder 41 is provided in the housing 1 and is located on a side of the bracket 2 away from the first opening 101, the cylinder 41 is partially inserted into the syringe 3, the pushing member 42 is detachably connected to an outer peripheral wall of the cylinder 41, the pushing mechanism 5 is provided on the housing 1 and is connected to the cylinder 41, and the pushing mechanism 5 is used for driving the cylinder 41 to move toward the first opening 101 in an axial direction thereof; when the pushing mechanism 5 drives the cylinder 41 to move, the pushing member 42 pushes the carriage 2 from the first position to the second position, the needle of the syringe 3 protrudes from the first opening 101, after which the pushing member 42 is separated from the cylinder 41, and the cylinder 41 drives the piston in the syringe 3 to move.

Specifically, since the pushing member 42 is detachably connected to the column 41, when the pushing mechanism 5 drives the plunger 4 to move, the plunger 4 can push the syringe 3 to a preset position by the pushing member 42 so that the needle of the syringe 3 extends out of the housing 1, at this time, the pushing member 42 is separated from the column 41, and then the column 41 pushes the piston in the syringe 3 to move, so that the syringe 3 completes the injection work, that is, when the automatic injection pen is not used, the syringe 3 is contained in the housing 1 and the smooth operation of the injection work of the subsequent automatic injection pen is not affected; in addition, as the injector 3 is accommodated in the shell 1, the needle of the injector 3 is not exposed, so that the automatic injection pen can not accidentally injure a user when not in use, and the potential safety hazard is reduced.

In the present embodiment, as shown in fig. 4, the outer peripheral wall of the column 41 has a locking slot 411; the pushing member 42 includes a pushing body 421 and a clamping body 422, where the pushing body 421 is annular and is disposed around the cylinder 41, the clamping body 422 is detachably clamped in the clamping slot 411, specifically, in the axial direction of the cylinder 41, two opposite slot sides of the clamping slot 411 are inclined planes, both of which are inclined outwards away from the center of the clamping slot 411, and based on this, when the pushing body 421 is stressed, the pushing body 421 can be separated from the cylinder 41 along the inclined plane of the clamping slot 411, and further, the clamping body 422 is a cantilever with a certain elasticity, one end of which is connected with the inner side of the pushing body 421, and the clamping body 422 with such a structure is stressed to bend so that the pushing body 421 is easier to separate from the cylinder 41.

In practical application, the initial position of the bracket 2 is the first position, and after receiving the force of the pushing member 42, it can move toward the first opening 101 to the second position, and when the bracket 2 is in the second position, it can not move toward the first opening 101 any more, so that the pushing body 421 will be separated from the column 41 by the reaction force of the bracket 2.

In addition, in the present embodiment, two blocks are provided on the outer peripheral wall of the column 41 at intervals along the axial direction of the column 41, and the engaging slot 411 is defined by the two blocks. In other embodiments, the engaging slot 411 may be formed by recessing the outer peripheral wall of the cylinder 41, which is not limited in this embodiment.

The force of the pushing member 42 to disengage from the column 41 is determined by the inclination of the side surface of the engaging slot 411 and the deformability of the engaging body 422, which is set according to the practical application, and the present invention is not limited thereto.

In other embodiments, as shown in fig. 5, the pushing member 42 includes a pushing body 421 and a weak body 423 connected to each other, the pushing body 421 is annular and is disposed around the cylinder 41, the weak body 423 is connected to the outer peripheral wall of the cylinder 41, and the weak body 423 can be separated from the cylinder 41 under the action of external force. In practical use, the external force refers to the reaction force of the bracket 2 received by the pushing body 421, and the weak body 423 is separated from the cylinder 41 by the reaction force, so that the pushing body 421 is separated from the cylinder 41. Specifically, the weak body 423 may be a thin sheet body, which is broken by force, or the connection between the weak body 423 and the post 41 is weak, and the connection is separated from the post 41 after force, which can realize the separation of the pushing member 42 from the post 41, which is not limited in this embodiment. In this embodiment, the pushing member 42 is integrally formed with the post 41, and the weak body 423 is a thin sheet, and the force of the pushing member 42 separating from the post 41 is determined by the thickness of the weak body 423, which is set according to practical applications, which is not limited in the present invention.

The two columns 41 can realize that the columns 41 push the bracket 2 and the piston in the injector 3 to move in sequence, so that the automatic injection stroke order can be ensured to finish the injection work, and the two columns have the advantage of simple structure. In addition, the plunger 4 connecting the pushing member 42 and the column body 41 through the engaging slot 411 can be repeatedly assembled with the column body 41, and therefore, if necessary in practical application, the plunger 4 can be reassembled and the injector 3 can be replaced, so that the automatic injection pen can be repeatedly used. While the plunger 4 of the pushing body 421 and the cylinder 41 are connected by the weak body 423, the plunger 4 and the syringe 3 can be replaced if the automatic injection pen needs to be reused.

In this embodiment, as shown in fig. 2 and 3, the outer peripheral wall of the cylinder 41 has a distance from the inner wall of the syringe 3, and therefore, during the process of moving the cylinder 41 in the syringe, the cylinder 41 has no friction with the inner wall of the syringe, so that the process of pushing the piston to move by the subsequent cylinder 41 is smoother. Specifically, the key of realizing the distance between the outer peripheral wall of the cylinder 41 and the inner wall of the syringe is: the plunger 4 comprises a structure of a cylinder 41 and a pushing piece 42 which are detachably connected, the pushing piece 42 pushes the bracket 2 to drive the injector 3 to move, the pushing piece 42 can be separated from the cylinder 41, based on the fact that the pushing piece 42 plays a role of pushing the bracket 2 and the cylinder 41 plays a role of pushing the piston, therefore, the cylinder 41 does not need to be in contact with the inner wall of the syringe, and friction is not needed to be considered when the structure is designed. If the cylinder 41 takes on the above two tasks, the plunger 4 is not required to be provided with the pushing member 42, but the cylinder 41 is provided with a structure for pushing the bracket 2 to move, for example, a part of the cylinder 41 is designed into a flexible and contractible elastic structure, the bracket 2 is pushed to move from the first position to the second position by the elastic structure, when the bracket 2 is fixed at the second position, the part of the cylinder 41 contracts and stretches into the syringe, and then the cylinder 41 moves in the syringe and pushes the piston, however, the structure has the defect that friction force is generated due to contact with the inner wall of the syringe during the movement of the cylinder 41, and the influence of the friction force on the force of pushing the piston by the plunger 4 is considered in the structural design, so that the design process is more complicated.

In this embodiment, as shown in fig. 2 and 3, the automatic injection pen further includes a mounting member 6 and a claw 100, where the mounting member 6 and the claw 100 are fixedly disposed in the housing 1, the mounting member 6 is located at one end of the housing 1 opposite to the first opening 101, the claw 100 is located at one side of the mounting member 6 away from the first opening 101, the mounting member 6 has a avoiding hole 601, and an axis of the avoiding hole 601 is parallel to an axis of the cylinder 41; the plunger 4 further comprises a connecting piece 43, the connecting piece 43 is fixedly arranged on the peripheral wall of the cylinder 41, the connecting piece 43 is positioned between the bracket 2 and the mounting piece 6, and one end of the cylinder 41 far away from the first opening 101 is provided with a clamping part 412; the housing 1 further has a second opening 102, the first opening 101 and the second opening 102 being disposed opposite to each other; the pushing mechanism 5 includes a button 51 and a first elastic member 52, the button 51 is provided at one end of the housing 1 opposite to the first opening 101, and the button 51 partially extends into the housing 1 through the second opening 102, the button 51 being movable in the axial direction of the cylinder 41; the column 41 passes through the avoidance hole 601, the clamping portion 412 is detachably clamped with the clamping jaw 100, opposite ends of the first elastic member 52 are respectively contacted with the mounting member 6 and the connecting member 43 in the axial direction of the column 41, the first elastic member 52 is used for driving the column 41 to move, and the button 51 is used for pressing the clamping jaw 100 so as to separate the clamping jaw 100 from the clamping portion 412.

Specifically, the first elastic member 52 is a spring, as shown in fig. 2, which is in a compressed state when the claw 100 catches the plunger 4, and at this time, the carriage 2 is in a first position, based on which, when an injection operation of the automatic injection pen is to be performed, the user presses the button 51, causing the button 51 to move axially along the cylinder 41 and press the claw 100 to separate the claw 100 from the catching portion 412, after which the spring is switched from the compressed state to an extended state, the spring drives the plunger 4 to move axially along the spring toward the first opening 101, and when the pusher 42 contacts the carriage 2, the carriage 2 starts to move from the first position to a second position, and when the carriage 2 is in the second position, it can no longer move toward the first opening 101, which applies a reaction force to the pusher 42 to disengage the pusher 42 from the cylinder 41, after which the cylinder 41 continues to move and push the piston of the syringe 3, thereby pushing the liquid medicine in the syringe 3, and at this time, the automatic injection structure is as shown in fig. 3, based on the above procedure to complete the injection operation of the automatic syringe 3.

In other embodiments, the first elastic member 52 may be other elastic members known to those skilled in the art, and the invention is not limited in this regard.

As a specific implementation of this embodiment, as shown in fig. 8, the claw 100 includes a first claw body 1001, a second claw body 1002 and a third claw body 1003 which are sequentially connected, the first claw body 1001 is connected to the housing 1, the second claw body 1002 is plate-shaped, the second claw body 1002 is oblique to the axis of the column 41, one end of the second claw body 1002 is connected to the first claw body 1001, the other end extends toward the center side of the housing 1 toward the first opening 101, at this time, the end has a distance from the inner wall of the housing 1, the third claw body 1003 is connected to one end of the second claw body 1002 which is away from the first claw body 1001, and the third claw body 1003 is located on one side of the second claw body 1002 which is toward the center side of the housing 1; the clamping part 412 is an annular groove body, and the groove body is arranged around the outer peripheral wall of the column 41; the claws 100 are provided with four claws 100 arranged around the axis of the column 41, two adjacent claws 100 are arranged at intervals, the third claw body 1003 of each claw 100 is detachably engaged with the groove body, and the button 51 is used for pressing the second claw body 1002. Specifically, the second claw body 1002 is obliquely arranged and the second claw body 1002 has a distance from the inner wall of the housing 1, so that when the second claw body 1002 receives the pressing force of the button 51, the end of the second claw body 1002 connected with the third claw body 1003 is deviated away from the center of the housing 1, and based on this, the third claw body 1003 can be separated from the groove body, and the claw 100 with such a structure has a simple structure and can effectively lock the plunger 4.

In addition, one end of the third claw body 1003 away from the second claw body 1002 extends obliquely toward the second opening 102, a side surface of the third claw body 100 facing away from the second claw body 1002 is an inclined surface, when the plunger 4 is connected with the claw body 100, the plunger 4 moves toward the second opening 102, in the process, the plunger 4 applies force to the inclined surface of the third claw body 1003, thereby the second claw body 1002 moves toward the first claw body 1001, and when the position of the third claw body 1003 corresponds to the groove body, the second claw body 1002 is reset without receiving the pressing force, and the third claw body 1003 is blocked into the groove body. The third jaw 1003 has the following advantages: after the third jaw 1003 is stressed, the second jaw 1002 is easier to deform, which is beneficial to the assembly of the plunger 4.

Further, as shown in fig. 2 and 3, the button 51 includes a button body 511 and a pressing body 512, the button body 511 has a mounting groove 510, the pressing body 512 is connected to a groove bottom surface of the mounting groove 510, the housing 1 is inserted into the mounting groove 510 and an outer circumferential wall of the housing 1 is in contact with a groove side surface of the mounting groove 510, the pressing body 512 extends into the housing 1 through the second opening 102, and the pressing body 512 is used for pressing the claw 100. As one implementation manner of the present invention, a limit groove is formed on the outer peripheral wall of the housing 1, a limit protrusion is formed on a groove side surface of the mounting groove 510, in the axial direction of the column 41, the length of the limit groove is greater than that of the limit protrusion, the limit protrusion is clamped into the limit groove, at this time, the button 51 may be movably disposed on the housing 1, in addition, the housing 1 is inserted into the mounting groove 510, the bottom surface of the mounting groove 510 may play a role in limiting the axial movement travel of the button body 511 along the column 41, and the excessive extrusion of the second claw 1002 by the button 51 may be prevented by reasonably designing the depth of the mounting groove 510.

Further, the automatic injection pen further comprises a limiting member 7, wherein the limiting member 7 is arranged on the peripheral wall of the housing 1, the limiting member 7 is positioned at one end of the housing 1 opposite to the first opening 101, and the limiting member 7 is detachably contacted with the button body 511 to limit the button body 511 to move, so that the user can be prevented from touching the button 51 by mistake. In this embodiment, the limiting member 7 is in an annular structure, one end of the housing 1 connected with the limiting member 7 is a cylindrical end, the limiting member 7 is in threaded connection with the cylindrical end, specifically, a user can make the limiting member 7 contact with or separate from the button body 511 by rotating the limiting member 7, the structure is simple, the operation is convenient, when the limiting member 7 contacts with the button body 511, the button body 511 cannot be pressed, and after the limiting member 7 is separated from the button body 511, the button 51 can be normally pressed.

In other embodiments, the limiting member 7 may have other structures, such as a locking position and an unlocking position, for example, the limiting member 7 is a rod body, which has a locking position contacting the button body 511 and an unlocking position having a distance from the button body 511 on the housing 1, and the rod body is switchable between two positions and is maintained in a corresponding position by a positioning bead.

In this embodiment, as shown in fig. 7, the automatic injection pen further includes positioning blocks 200, the positioning blocks 200 are fixedly disposed on the inner wall of the casing 1, at least two positioning blocks 200 are disposed, and all the positioning blocks 200 are annularly arranged at intervals; as shown in fig. 6, the bracket 2 has a positioning part, the positioning part includes a positioning table 21, a connecting block 22, a first positioning pin 23, a second positioning pin 24 and a first clamping block 25, the positioning table 21 is connected with the bracket 2, one end of the connecting block 22 is connected with the side surface of the positioning table 21 close to the first opening 101, the other end is connected with the first positioning pin 23 and the second positioning pin 24, the first positioning pin 23 and the second positioning pin 24 extend towards the first opening 101 and are distributed at intervals, and the side surface of the first positioning pin 23 facing away from the second positioning pin 24 and the side surface of the second positioning pin 24 facing away from the first positioning pin 23 are both provided with the first clamping block 25; when the bracket 2 is located at the first position, the first clamping blocks 25 on the first positioning leg 23 and the second positioning leg 24 are respectively contacted with the two adjacent positioning blocks 200, at this time, if no external force exists, the bracket 2 can be stably arranged at the first position, when the bracket 2 is located at the second position, the connecting block 22 is penetrated between the two adjacent positioning blocks 200, the positioning table 21 is contacted with the positioning blocks 200, at this time, even if the external force acts, the bracket 2 can be kept at the second position and cannot move. In the process of moving the bracket 2 from the first position to the second position, the first positioning pin 23 and the second positioning pin 24 are arranged at intervals, so that the first positioning pin 23 and the second positioning pin 24 are close to each other under the action of the positioning block 200 and the first clamping block 25, the first positioning pin 23, the second positioning pin 24 and the connecting block 22 pass through the space between the two positioning blocks 200, so that the bracket 2 can move smoothly. In this structure, the first position and the second position of the bracket 2 are defined by the positioning block 200, and the positioning block 200 is disposed on the inner wall of the housing 1, which can strengthen the strength of the housing 1.

In other embodiments, the position of the bracket 2 in the housing 1 may be defined by forming a first positioning hole and a second positioning hole in the housing 1, where the first positioning hole and the second positioning hole are axially arranged along the column 41, and a buckle matched with the first positioning hole and the second positioning hole is disposed on the bracket 2, where the second positioning hole is located between the first positioning hole and the first opening 101, and the buckle can be separated from the first positioning hole but not separated from the second positioning hole after the bracket 2 is stressed, where the first positioning hole defines a first position of the bracket 2, and the second positioning hole defines a second position of the bracket 2.

In this embodiment, as shown in fig. 2, the automatic injection pen further includes a protecting sleeve 8 and a second elastic member 9, the protecting sleeve 8 is movably connected to one end of the bracket 2 near the first opening 101, the protecting sleeve 8 extends partially out of the first opening 101, the needle of the syringe 3 extends into the protecting sleeve 8, the second elastic member 9 connects the protecting sleeve 8 and the bracket 2, so that the protecting sleeve 8 is fixed, specifically, a connecting groove is formed in the protecting sleeve 8, a connecting protrusion is formed in the bracket 2, in the axial direction of the column 41, the length of the connecting groove is greater than that of the connecting protrusion, the connecting protrusion is clamped in the connecting groove, one end of the protecting sleeve 8 is sleeved on the bracket 2, and the protecting sleeve 8 can be stably connected with the bracket 2 under the action of the second elastic member 9; when the protective sleeve 8 is stressed, the protective sleeve 8 can retract towards the column 41 based on the length of the connecting groove being greater than the length of the connecting protrusion. In practical application, when an injection is required, a user presses the automatic injection pen on the injection site, the protective sleeve 8 is firstly contacted with the injection site, the protective sleeve 8 is retracted for a certain distance to ensure that the needle of the subsequent syringe 3 can be inserted into the injection site, then the button 51 is pressed down to release the plunger 4, the bracket 2 moves from the first position to the second position under the action of the plunger 4, at this time, the second elastic piece 9 can compress and provide a counterforce for the protective sleeve 8, and the protective sleeve 8 can be pressed on the injection site more tightly, so that a certain analgesic effect can be achieved.

In this embodiment, the second elastic member 9 is a spring, which has a simple structure and is convenient to use. In other embodiments, the second elastic member 9 may be other elastic members known to those skilled in the art, which the present invention is not limited to.

Further, as shown in fig. 3, 6 and 7, the automatic injection pen further includes a second latch 300, where the second latch 300 is disposed on the inner wall of the housing 1 and is located at one end of the housing 1 near the first opening 101; the outer wall of the protective sleeve 8 is also provided with a strip-shaped clamping groove 801, the length direction of the clamping groove 801 is parallel to the axial direction of the column 41, and the length of the clamping groove 801 is larger than the length of the second clamping block 300 in the axial direction of the column 41; when the bracket 2 is located at the first position, the second clamping block 300 is located between the clamping groove 801 and the first opening 101, and the clamping groove 801 and the second clamping block 300 are arranged along the axial direction of the column 41, and the second clamping block 300 is used for being clamped at one end of the clamping groove 801, which is close to the first opening 101, so as to prevent the protective sleeve 8 from retracting towards the direction of the column 41. Specifically, when the injection is performed, the injection part can limit the movement of the protective sleeve 8, and after the bracket 2 moves from the first position to the second position, the protective sleeve 8 and the bracket 2 can compress the second elastic element 9, so, when the injection is completed, the protective sleeve 8 is driven to move away from the second opening 102 in the process of restoring the initial state, at this time, the second clamping block 300 can be clamped into the clamping groove 801, and the second clamping block 300 can be clamped at one end, close to the first opening 101, of the clamping groove 801 under the action of the bracket 2, at this time, the protective sleeve 8 is in a state of extending out of the first opening 101 and is kept, the needle of the injector 3 is positioned in the protective sleeve 8, the second clamping block 300 can limit the protective sleeve 8 to move towards the second opening 102, and on the basis of the fact that the needle is mistakenly touched, the protective sleeve 8 can not move towards the second opening 102, namely, the user can not be exposed, the accidental injury can be avoided, and the potential safety hazard is reduced.

The second clamping block 300 is an elastic buckle, and has a simple structure, so that the clamping work can be smoothly performed.

In this embodiment, as shown in fig. 1 and 2, the automatic injection pen further includes a protective cap 10, where the protective cap 10 is detachably connected to the housing 1 and covers the first opening 101, and the protective cap 10 also includes the protective cover 8, and the protective cap 10 can prevent foreign matters from entering the housing 1 from the first opening 101, and can also prevent the protective cover 8 from being contaminated.

In practical application, the liquid medicine stored in the syringe 3 is located at one end of the syringe, which is close to the first opening 101, further, as shown in fig. 3, the outer wall of the housing 1 is provided with a first observation port 103, the bracket 2 is provided with a second observation port 201, the syringe 3 is made of transparent material, and one end of the syringe 3, which is close to the first opening 101, corresponds to the second observation port 201; when the bracket 2 is positioned at the first position, the first observation port 103 and the second observation port 201 are partially corresponding, based on the first observation port 103 and the second observation port 201, the medical liquid can be confirmed to be normal before the automatic injection pen is used, and when the bracket 2 is positioned at the second position, the first observation port 103 and the second observation port 201 are opposite, based on the second observation port, a user can observe whether the medical liquid is injected completely when using the automatic injection pen, and the using convenience of the automatic injection pen can be improved. Specifically, the protecting sleeve 8 is also provided with an observation port, when the bracket 2 is positioned at the first position, the first observation port 103, the second observation port 201 and the observation port on the protecting sleeve 8 are partially corresponding, and when the bracket 2 is positioned at the second position, the first observation port 103, the second observation port 201 and the observation port on the protecting sleeve 8 are directly opposite.

In this embodiment, as shown in fig. 2 and 3, the automatic injection pen further includes a cushion pad 11, the cushion pad 11 being disposed at an end of the bracket 2 remote from the first opening 101; the outer wall of the end of the syringe 3, which is far away from the first opening 101, is provided with a connecting lug 31, and the connecting lug 31 is contacted with one side, which is far away from the first opening 101, of the cushion 11. Specifically, the cushion 11 can absorb the impact force generated when the pushing member 42 contacts with the bracket 2, and can also absorb the pressure to the bracket 2 when the pushing member 42 pushes the bracket 2, so that the structure of the automatic injection pen is more reliable, and the injection work of the automatic injection pen is more stable.

The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and substitutions can be made by those skilled in the art without departing from the technical principles of the present invention, and these modifications and substitutions should also be considered as being within the scope of the present invention.

Claims

1. An automatic injection pen characterized by comprising a housing (1), a bracket (2), a syringe (3), a plunger (4) and a pushing mechanism (5), wherein the housing (1) is provided with a first opening (101), the bracket (2) is movably arranged in the housing (1) and is provided with a first position and a second position, the syringe (3) is arranged in the housing (1) and is fixedly arranged on the bracket (2), the plunger (4) comprises a cylinder (41) and a pushing member (42), the cylinder (41) is arranged in the housing (1) and is positioned on one side, away from the first opening (101), of the bracket (2), the cylinder (41) partially extends into the syringe (3), the pushing member (42) is detachably connected to the peripheral wall of the cylinder (41), the pushing mechanism (5) is arranged on the housing (1) and is connected with the cylinder (41), and the pushing mechanism (5) is used for driving the cylinder (41) to move towards the first opening (101) along the axial direction;

When the pushing mechanism (5) drives the cylinder (41) to move, the pushing piece (42) pushes the bracket (2) to move from the first position to the second position, the needle of the syringe (3) stretches out of the first opening (101), after that, the pushing piece (42) is separated from the cylinder (41), and the cylinder (41) drives the piston in the syringe (3) to move.

2. The automatic injection pen according to claim 1, characterized in that the outer peripheral wall of the cylinder (41) has a snap-in slot (411);

The pushing piece (42) comprises a pushing main body (421) and a clamping body (422) which are connected with each other, the pushing main body (421) is annular and is arranged on the periphery of the column body (41) in a surrounding mode, and the clamping body (422) is detachably clamped in the clamping groove (411).

3. The automatic injection pen according to claim 1, wherein the pushing member (42) comprises a pushing body (421) and a weak body (423) connected to each other, the pushing body (421) is ring-shaped and is provided around the circumference of the cylinder (41), the weak body (423) is connected to the outer circumference of the cylinder (41), and the weak body (423) is detachable from the cylinder (41) by external force.

4. An automatic injection pen according to claim 1, characterized in that the peripheral wall of the cylinder (41) is at a distance from the inner wall of the syringe (3) barrel.

5. The automatic injection pen according to claim 1, characterized in that it further comprises a mounting member (6) and a claw (100), said mounting member (6) and said claw (100) being fixedly arranged in said housing (1), said mounting member (6) being located at an end of said housing (1) opposite said first opening (101), said claw (100) being located at a side of said mounting member (6) remote from said first opening (101), said mounting member (6) having a relief hole (601), an axis of said relief hole (601) being parallel to an axis of said cylinder (41);

The plunger (4) further comprises a connecting piece (43), the connecting piece (43) is fixedly arranged on the peripheral wall of the cylinder (41), the connecting piece (43) is positioned between the bracket (2) and the mounting piece (6), and one end, far away from the first opening (101), of the cylinder (41) is provided with a clamping part (412);

The shell (1) is also provided with a second opening (102), and the first opening (101) and the second opening (102) are oppositely arranged; the propulsion mechanism (5) comprises a button (51) and a first elastic piece (52), the button (51) is arranged at one end of the shell (1) opposite to the first opening (101), the button (51) extends into the shell (1) partially through the second opening (102), and the button (51) can move along the axial direction of the cylinder (41);

Wherein, cylinder (41) pass dodge hole (601), just joint portion (412) with jack catch (100) detachably joint in the axial of cylinder (41), first elastic component (52) opposite both ends respectively with installed part (6) with connecting piece (43) contact, first elastic component (52) are used for the drive cylinder (41) remove, button (51) are used for pressing jack catch (100), so that jack catch (100) with joint portion (412) separation.

6. The automatic injection pen according to claim 5, characterized in that the claw (100) comprises a first claw body (1001), a second claw body (1002) and a third claw body (1003) which are connected in sequence, the first claw body (1001) is connected with the housing (1), the second claw body (1002) is plate-shaped, the second claw body (1002) is oblique to the axis of the column body (41), one end of the second claw body (1002) is connected with the first claw body (1001), the other end extends toward the first opening (101) toward the center side of the housing (1), the third claw body (1003) is connected to one end of the second claw body (1002) away from the first claw body (1001), and the third claw body (1003) is positioned on one side of the second claw body (1002) toward the center side of the housing (1);

The clamping part (412) is an annular groove body, and the groove body is arranged around the outer peripheral wall of the column body (41);

The clamping jaws (100) are provided with at least two clamping jaws (100) which are arranged around the axis of the column body (41), two adjacent clamping jaws (100) are arranged at intervals, the third clamping jaw body (1003) of each clamping jaw (100) is detachably clamped with the groove body, and the button (51) is used for pressing the second clamping jaw body (1002).

7. The automatic injection pen according to claim 5, wherein the button (51) comprises a button body (511) and a pressing body (512), the button body (511) has a mounting groove (510), the pressing body (512) is connected to a groove bottom surface of the mounting groove (510), the housing (1) is inserted into the mounting groove (510) and an outer peripheral wall of the housing (1) is in contact with a groove side surface of the mounting groove (510), the pressing body (512) extends into the housing (1) through the second opening (102), and the pressing body (512) is used for pressing the claw (100).

8. The automatic injection pen according to claim 7, further comprising a stopper (7), the stopper (7) being provided on an outer peripheral wall of the housing (1), and the stopper (7) being located at an end of the housing (1) with respect to the first opening (101), the stopper (7) being detachably contacted with the button body (511) to restrict the button (51) body from moving.

9. The automatic injection pen according to claim 8, wherein the limiting member (7) has an annular structure, one end of the housing (1) connected with the limiting member (7) is a cylindrical end, the limiting member (7) is in threaded connection with the cylindrical end, and rotation of the limiting member (7) can separate the limiting member (7) from the button body (511).

10. The automatic injection pen according to claim 1, further comprising positioning blocks (200), wherein the positioning blocks (200) are fixedly arranged on the inner wall of the shell (1), at least two positioning blocks (200) are arranged, and all the positioning blocks (200) are annularly arranged at intervals;

The bracket (2) is provided with a positioning part, the positioning part comprises a positioning table (21), a connecting block (22), a first positioning pin (23), a second positioning pin (24) and a first clamping block (25), the positioning table (21) is connected with the bracket (2), one end of the connecting block (22) is connected with the side surface, close to the first opening (101), of the positioning table (21), the other end of the connecting block is connected with the first positioning pin (23) and the second positioning pin (24), the first positioning pin (23) and the second positioning pin (24) extend towards the first opening (101) and are distributed at intervals, and the side surface, opposite to the second positioning pin (24), of the first positioning pin (23) is provided with the first clamping block (25);

When the bracket (2) is located at the first position, the first clamping blocks (25) on the first positioning pins (23) and the second positioning pins (24) are respectively contacted with the adjacent two positioning blocks (200), and when the bracket (2) is located at the second position, the connecting blocks (22) are arranged between the adjacent two positioning blocks (200) in a penetrating mode, and the positioning table (21) is contacted with the positioning blocks (200).

11. The automatic injection pen according to claim 1, characterized in that it further comprises a protective sheath (8) and a second elastic member (9), said protective sheath (8) being movably connected to an end of said carrier (2) near said first opening (101), and said protective sheath (8) extending partially outside said first opening (101), the needle of said injector (3) extending into said protective sheath (8), said second elastic member (9) connecting said protective sheath (8) and said carrier (2) so as to fix said protective sheath (8);

When the protective sleeve (8) is stressed, the protective sleeve (8) can retract towards the column body (41).

12. The automatic injection pen according to claim 11, further comprising a second latch (300), said second latch (300) being provided on an inner wall of said housing (1) at an end of said housing (1) adjacent to said first opening (101);

the outer wall of the protective sleeve (8) is also provided with a strip-shaped clamping groove (801), the length direction of the clamping groove (801) is parallel to the axial direction of the cylinder (41), and the length of the clamping groove (801) is larger than the length of the second clamping block (300) in the axial direction of the cylinder (41);

When the bracket (2) is located at the first position, the second clamping block (300) is located between the clamping groove (801) and the first opening (101), the clamping groove (801) and the second clamping block (300) are axially distributed along the cylinder (41), and the second clamping block (300) is used for being clamped at one end, close to the first opening (101), of the clamping groove (801) so as to prevent the protective sleeve (8) from retracting towards the direction of the cylinder (41).

13. The automatic injection pen according to claim 1, characterized in that it further comprises a protective cap (10), said protective cap (10) being removably connected to said housing (1) and covering said first opening (101).

14. The automatic injection pen according to claim 1, characterized in that a first observation port (103) is formed in the outer wall of the shell (1), a second observation port (201) is formed in the bracket (2), the syringe (3) is made of transparent material, and one end, close to the first opening (101), of the syringe (3) corresponds to the second observation port (201);

When the bracket (2) is positioned at the second position, the first observation port (103) and the second observation port (201) are opposite.

15. The automatic injection pen according to claim 1, characterized in that it further comprises a cushion (11), said cushion (11) being arranged at an end of the carriage (2) remote from the first opening (101);

The outer wall of the syringe (3) needle cylinder, which is far away from one end of the first opening (101), is provided with a connecting lug (31), and the connecting lug (31) is contacted with one side of the buffer pad (11), which is far away from the first opening (101).