CN115006649A

CN115006649A - Drug delivery device

Info

Publication number: CN115006649A
Application number: CN202210839957.XA
Authority: CN
Inventors: 熊长艳; 何四现; 易林川; 郝明; 李兴武; 王凯
Original assignee: Suzhou Jiashu Medical Technology Co ltd
Current assignee: Suzhou Jiashu Medical Technology Co ltd
Priority date: 2022-07-18
Filing date: 2022-07-18
Publication date: 2022-09-06

Abstract

The present invention provides a drug delivery device comprising: an energy source assembly and an injection assembly. The energy component of the drug delivery device has multiple functions, assists in mounting and fixing the propelling component, and can realize the function of starting automatic protection after injection is finished. In addition, an injection completion prompting sound can be generated after the injection is completed so as to remind the user that the injection is completed. Thus, the structure of the drug delivery device is greatly simplified due to the integration of multiple functions of the energy source assembly. In the shell assembly of the drug delivery device, the outer sleeve adopts a split design, so that the split assembly of the drug delivery device is facilitated, the assembly efficiency is further improved, and the product cost is reduced. In addition, the inner sleeve can compress and fix the injection assembly. Thus, while ensuring the stability of the injection assembly, the components that assist in compression are also omitted, which is advantageous for simplifying the structure of the drug delivery device.

Description

Drug delivery device

Technical Field

The invention relates to the technical field of medical instruments, in particular to a drug delivery device.

Background

The medicine delivery device can automatically inject liquid medicine into a human body in an injection mode, has the advantages of convenience in carrying and use and the like, and overcomes many defects of a traditional injector.

The drug delivery device essentially comprises: injection mechanisms, power mechanisms, and the like. The injection mechanism is used for storing liquid medicine, and the power mechanism can trigger the injection mechanism to work so as to realize automatic injection of the liquid medicine.

However, the existing drug delivery devices are relatively complex in structure, not conducive to product assembly, and result in high costs. Therefore, it is necessary to provide a further solution to the above problems.

Disclosure of Invention

The present invention aims to provide a drug delivery device which overcomes the disadvantages of the prior art.

In order to solve the technical problems, the technical scheme of the invention is as follows:

a drug delivery device, comprising: an energy source assembly and an injection assembly;

the energy source assembly includes: a protective shell, a motion element, a propulsion member, an activation element, and an energy element;

the protective shell is axially arranged in a sliding manner, and one end of the protective shell abuts against the moving element; the moving element is sleeved on the activation element and can control the release of the propelling component in the activation element along with the sliding of the protective shell; the motion element is locked by the activation element when the motion element slides reversely to the limit position under the pushing of the energy element;

the injection assembly is housed in the protective shell, which includes: a container for holding a liquid;

the propelling component extends into the container, and after the propelling component is released, the propelling component pushes the liquid in the container out under the pushing of the energy source element; when the moving element is in a locked state, the needle head of the container is contained in the protective shell.

As an improvement of the drug delivery device of the present invention, the activation element is provided with first elastic buckles at both sides;

the first elastic buckle comprises: the first elastic arm is connected with the activation element main body, the first clamping point is arranged on the inner side of the end part of the first elastic arm, and the salient point is arranged on the outer side of the end part of the first elastic arm;

the motion element is through the extrusion bump for first elasticity buckle is inside to the side bending, and first stuck point on it is gone into in the propulsion member, when motion element with bump separation, the propulsion member is in the release state.

As an improvement of the drug delivery device of the present invention, the energy source element comprises an elastomer one; the elastic body is accommodated in the propelling component, is initially in a compressed state and can push the propelling component to push out the liquid in the container when being stretched.

As an improvement of the drug delivery device of the present invention, the activation element is provided with second elastic buckles at both sides;

the second elastic buckle comprises: the second elastic arm is connected with the activating element main body, and the second clamping point is arranged on the outer side of the end part of the second elastic arm;

the second clamping point is initially abutted against the inner side wall of the moving element, and the moving element is locked and limited by the second clamping point in the axial direction when moving to the limit position.

As a modification of the drug delivery device of the present invention, the energy source element comprises an elastomer two;

the elastic body is sleeved on the whole formed by assembling the activation element and the moving element, one end of the elastic body is abutted against the flanging at the end part of the moving element, and the other end of the elastic body is abutted against the convex rib at the end part of the activation element; and the elastic body II is initially in a compressed state and can push the moving element to move reversely when being stretched.

As an improvement of the drug delivery device of the present invention, the drug delivery device further comprises a rear cover, which is fastened to the tail end of the drug delivery device; the activation element is pushed by the energy source element to impact the rear cover to give an end-of-injection prompt sound.

As an improvement of the drug delivery device of the present invention, the energy source element comprises: an elastic body I and an elastic body II;

the elastic body is accommodated in the propelling component, is initially in a compressed state and can push the propelling component to push out the liquid in the container when being stretched;

As an improvement of the drug delivery device of the present invention, the drug delivery device further comprises a housing assembly comprising: the rear cover is arranged at the rear end of the outer sleeve;

the jacket includes: the device comprises a first shell and a second shell connected with the end part of the first shell;

the energy component is arranged in the first shell through an inner sleeve; the injection assembly is installed in the second shell, and the inner sleeve compresses and fixes the injection assembly.

As an improvement of the medicine delivery device, two outwards obliquely arranged press feet extend out of the end surface of the inner sleeve, and the press feet are abutted against a container of the injection assembly.

As an improvement of the drug delivery device of the present invention, the drug delivery device further comprises a pen cap assembly comprising: the pen cap comprises a pen cap and a pen cap clamping ring positioned in the pen cap;

the pen cap clamping ring is sleeved on the protective sleeve of the needle head when the pen cap is buckled at the front end of the medicine conveying device; the pen cap clamping ring is also provided with a buckle extending inwards, and the buckle is obliquely arranged along the pulling-out direction of the pen cap; the protective sleeve is provided with a clamping groove matched with the buckle.

Compared with the prior art, the invention has the beneficial effects that:

the energy component of the drug delivery device has multiple functions, assists in the installation and fixation of the propelling component, and can also realize the locking of the moving element after the injection is finished. In addition, the rear cover can be impacted to give out a prompt sound after the injection is finished so as to remind a user that the injection is finished. Thus, the structure of the drug delivery device is greatly simplified due to the integration of multiple functions of the energy source assembly.

In the shell assembly of the drug delivery device, the outer sleeve adopts a split design, so that the split assembly of the drug delivery device is facilitated, the assembly efficiency is further improved, and the product cost is reduced. In addition, the inner sleeve can compress and fix the injection assembly. Thus, while ensuring the stability of the injection assembly, the components that assist in compression are also omitted, which is advantageous for simplifying the structure of the drug delivery device.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic perspective view of one embodiment of a drug delivery device according to the present invention;

FIG. 2 is a perspective view of the outer casing of the housing assembly of FIG. 1;

FIG. 3 is an exploded perspective view of the inner housing and tail cap of the housing assembly of FIG. 1;

FIG. 4 is a schematic perspective view of the energy source assembly of FIG. 1;

FIG. 5 is a schematic perspective view of the protective shell of FIG. 4;

FIG. 6 is a sectional view showing a state where the shield case is combined with the second housing;

FIG. 7 is an exploded perspective view of the first elastomer, the pusher member, and the activation element of FIG. 4;

FIG. 8 is a perspective view of the activation element of FIG. 7;

FIG. 9 is a perspective view of the first resilient latch of FIG. 8;

FIG. 10 is a perspective view of the second resilient latch of FIG. 8;

FIG. 11 is a perspective view of the injection assembly and cap assembly of FIG. 1;

FIG. 12 is an enlarged perspective view of the injection assembly of FIG. 11;

fig. 13 is an enlarged perspective view of the cap assembly of fig. 11.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

An embodiment of the present invention provides a drug delivery device for automatically injecting a drug such as insulin into a human body by acting on the skin of the human body. The present embodiment provides significant advantages for the drug delivery device by optimizing the design of the power part, the injection part, and the cap.

As shown in fig. 1, the drug delivery device of the present embodiment comprises: a housing assembly 10, an energy source assembly 20, an injection assembly 30, and a cap assembly 40.

The housing component 10 forms the structure of the casing 11 of the drug delivery device of the present embodiment, the energy source component 20 and the injection component 30 are installed in the space enclosed by the housing component 10, and the cap component 40 is assembled at the front end of the housing component 10. In this manner, the housing assembly 10 can assist in the mounting and securing of other components and provide protection for the components inside.

Referring collectively to fig. 2, the housing assembly 10 includes: an outer sleeve 11, an inner sleeve 12 fitted in the outer sleeve 11, and a rear cover 13 mounted to a rear end of the outer sleeve 11.

Wherein, overcoat 11 adopts split type structure, and it includes: a first casing 111 and a second casing 112, and the lower end of the first casing 111 is connected with the upper end of the second casing 112. So, through adopting split type structural style, be favorable to this embodiment drug delivery device's split type equipment, and then improve the efficiency of equipment.

In one embodiment, the first housing 111 and the second housing 112 are connected by a snap-fit connection. At this time, the assembling end of the first housing 111 or the assembling end of the second housing 112 is provided with a first buckle 1111, and correspondingly, the assembling end of the second housing 112 or the assembling end of the first housing 111 is provided with a first card slot 1121 matched therewith.

When the first buckle 1111 is disposed at the assembling end of the first housing 111, it is disposed at two sides of the assembling end symmetrically and along the inserting assembling direction. In order to facilitate the insertion and engagement, two first guide grooves 1122 are formed at the assembling end of the second housing 112, and the first guide grooves 1122 extend to the inner side wall of the assembling end of the second housing 112. The first locking slots 1121 are respectively disposed below the two first guiding slots 1122 in the plugging direction. In this way, when the first housing 111 and the second housing 112 are assembled, the first buckle 1111 can be clamped into the first clamping groove 1121 at the lower part under the guidance of the first guiding groove 1122, so as to realize the clamping and fixing of the upper second housing 112.

In order to axially limit the assembly of the first housing 111, the outer sidewall of the assembly end of the first housing 111 is provided with a first limit step 1112, and the inner sidewall of the assembly end of the second housing 112 is provided with a second limit step 1123. At this time, the first limit step 1112 of the first housing 111 abuts against the end surface of the second housing 112, and the second limit step 1123 of the second housing 112 abuts against the end surface of the first housing 111.

A rear cover 13 is fitted to the rear end of the outer jacket 11 to close the outer jacket 11. In one embodiment, the rear cover 13 is engaged with the rear end of the outer cover 11 in the same manner as the first housing 111 and the second housing 112, and includes a structure of a snap, a slot and a guide groove, which will not be described again.

Referring also to fig. 3, the inner housing 12 is mounted in the first housing 111 for mounting and securing the auxiliary energy source assembly 20 and the injection assembly 30.

Specifically, the inner sleeve 12 is mounted in the first housing 111 through the rear cover 13. In one embodiment, the inner sleeve 12 is connected to the rear cover 13 by a snap-fit connection. At this time, the inner sleeve 12 is provided with a second buckle 121, and correspondingly, the rear cover 13 is provided with a second locking groove 131 matched with the second buckle. Preferably, the second fasteners 121 are distributed in a central symmetry manner, and the second locking grooves 131 are correspondingly disposed on the rear cover 13.

The inner sleeve 12 is axially arranged in a penetrating way, and in order to match the action of the energy source assembly 20, the inner sleeve 12 is further provided with: a first avoiding groove 122, a second avoiding groove 123 and a limiting sliding groove 124. The first avoiding groove 122 and the second avoiding groove 123 are used for extending out of components on the energy assembly 20 so as to realize the functions of unlocking, locking and the like of the energy assembly 20 in a matching manner; the limiting chute 124 is used for guiding the motion of the energy source assembly 20.

To assist in securing the syringe assembly 30, a pressure foot 125 is disposed at an end of the inner housing 12 adjacent to the syringe assembly 30 for abutting against the inner housing to axially limit the syringe assembly 30 and further ensure the stability of the syringe assembly 30. Meanwhile, the integral design of the presser foot 125 and the inner sleeve 12 is beneficial to the simplification of the structure.

In one embodiment, two outwardly inclined press feet 125 extend from the end surface of the inner sleeve 12, the end portions of the press feet 125 are bent to abut against the rear end of the container in the injection assembly 30. Thus, the two presser feet 125 form a triangular structure with the container, which is beneficial to ensuring that the container can always keep stable when injection and vibration are applied. In addition, in order to improve the strength of the presser foot 125, a reinforcing rib 126 is further provided between the inclined portion and the bent portion of the presser foot 125.

As shown in fig. 4, the energy source assembly 20 is used for driving the injection molding assembly to perform an injection operation, and includes: a protective shell 21, a moving element 22, a propulsion member 23, an activation element 24, a first elastic body 25 and a second elastic body 26.

The shielding shell 21 is used to prevent the needle of the injection assembly 30 from being exposed to the outside after the injection is completed, and also to push the moving element 22 to activate the injection assembly 30 to perform the injection.

As shown in fig. 5 and 6, the protective shell 21 is axially disposed through and slidably mounted in the second housing 112. In order to facilitate the installation and fixation of the protective shell 21, an opening at one end of the protective shell 21 is provided with an annular flange 211, and the flange 211 can axially limit the protective shell 21. Meanwhile, the inner side of the turned-over edge 211 is further provided with a buckling structure 212, and the buckling structure 212 comprises two T-shaped buckles which are distributed in a central symmetry manner. In addition, mounting grooves 213 are further formed in two sides of the protective shell 21, and the mounting grooves 213 on any side extend to the end of the protective shell 21.

Correspondingly, the second housing 112 has a limiting strip 1124 and a limiting ring 1125. The limiting strip 1124 is disposed on the inner sidewall of the second housing 112 and is disposed correspondingly to the mounting groove 213. The retainer 1125 is disposed at the front end of the two retainer 1124 and is coaxial with the second housing 112. In addition, a third slot 1126 is disposed at the front end of the second housing 112 and the retainer ring 1125.

In this manner, when the protective shell 21 is assembled with the second housing 112, the protective shell 21 is inserted from the front end thereof with respect to the second housing 112. At this time, the two T-shaped snaps on the protective shell 21 are engaged with the front end of the second housing 112 and the third slot 1126 on the retainer ring 1125. Meanwhile, the turned-over edge 211 of the protective shell 21 abuts against the end face of the limit ring 1125, and the mounting groove 213 of the protective shell 21 is matched with the limit strip 1124 in the second shell 112.

The moving element 22 is slidably sleeved on the inner sleeve 12, and the other end of the protective shell 21 further has two axially arranged extension arms 214, and the end portions of the extension arms 214 abut against the end surfaces of the moving element 22. In this way, when injecting the drug, the drug delivery device of the present embodiment is pressed against the skin, and the protective shell 21 is pushed under the pressure, so that the needle of the injection assembly 30 is exposed therein. At the same time, the protective shell 21 can push the moving element 22 to slide, thereby triggering the injection assembly to perform injection.

As shown in fig. 7, the pusher member 23 is initially secured within the activation element 24, and the activation element 24 is further mounted within the inner sleeve 12. The pusher member 23 extends at one end from the activation element 24 and into the reservoir of the injection assembly 30. A plug 231 is also attached to the end of the pusher member 23 that extends into the container. Thus, when the rubber plug 231 acts, the medicine liquid in the container can be pushed out to realize automatic injection.

The first elastic body 25 is used for providing power for the injection action of the propelling member 23, is accommodated in the propelling member 23, and is initially in a compressed state under the squeezing action of the propelling member 23. The first elastic body 25 may be various materials with certain elasticity, such as a spring, etc.

The first elastomer 25 is fitted over a spring post 132 on the rear cover 13 that extends into the pusher member 23. One end of the first elastic body 25 abuts against the rear cover 13, and the other end abuts against the inner end surface of one end of the propelling member 23. Thus, when the pushing member 23 is in the active state, it can push the liquid medicine in the container out through the rubber plug 231 under the elastic action of the first elastic body 25.

The second elastic body 26 is used for assisting in achieving locking of the moving element 22 after completion of injection and pushing the activating element 24 to strike the rear cover 13 to give an alarm sound after completion of injection. The second elastic body 26 may be various materials with certain elasticity, such as a spring.

The second elastic body 26 is sleeved on the whole formed by assembling the activation element 24, the inner sleeve 12 and the moving element 22, one end of the second elastic body abuts against the flanging 211 at the end part of the moving element 22, and the other end abuts against the convex rib 243 at the end part of the activation element 24. And the second elastomer 26 is initially in a compressed state.

As shown in fig. 8, 9 and 10, the activating element 24 has multiple functions, which assist in fixing the propelling member 23 and also enable the locking of the moving element 22 after the injection is completed. In addition, the activation element 24 may also strike the rear cap 13 after the injection is completed to emit a warning tone to alert the user that the injection has been completed.

In order to assist the mounting and fixing of the pushing member 23, i.e. to initially limit the pushing member 23 and to release the limit of the pushing member 23 when injecting, first elastic catches 241 are respectively arranged in the first hollow-out areas on both sides of the activating element 24. The first elastic clip 241 includes: the first elastic arm 2411 is connected to the main body of the activation element, the first locking point 2412 is disposed on the inner side of the end portion of the first elastic arm 2411, and the protruding point 2413 is disposed on the outer side of the end portion of the first elastic arm 2411. Correspondingly, the two sides of the pushing member 23 are provided with fourth locking grooves 232.

The first elastic buckle 241 is disposed opposite to the first avoiding groove 122 on the inner sleeve 12. In this way, the protruding point 2413 on the first elastic buckle 241 can abut against the inner side wall of the moving element 22, and under the limit of the moving element 22, the first elastic buckle 241 bends inward, so that the first locking point 2412 on the first elastic buckle 241 is locked in the fourth locking groove 232 of the pushing member 23. Thus, under the limit action of the first stopping point 2412, the pushing member 23 can press the first elastic body 25 to be in a compressed state. When the injection presses the protective shell 21, the movable element 22 is pushed to slide, and when the movable element 22 moves to a position separated from the protruding point 2413, the first elastic catch 241 returns to the initial state, and the first catch point 2412 can be disengaged from the fourth catch groove 232. At this time, the pushing member 23 is in a releasing state, and then under the action of the first elastic body 25, the rubber plug 231 is pushed to push out the liquid medicine in the container, so as to realize automatic injection.

In order to achieve the locking of the moving element 22 after the injection is completed, the second elastic buckles 242 are respectively disposed in the second hollow areas on two sides of the activation element 24, and the second elastic buckles 242 and the first elastic buckles 241 are disposed in a staggered manner. In one embodiment, the first elastic catch 241 is disposed near an end of the activation element 24, and the second elastic catch 242 is disposed behind the first elastic catch 241 and is offset from the first elastic catch 241.

The second elastic catch 242 includes: a second elastic arm 2421 connected with the activation element main body, and a second clamping point 2422 arranged outside the end part of the second elastic arm 2421. The second elastic buckle 242 is disposed opposite to the second avoiding groove 123 on the inner sleeve 12. In this way, the second stopping point 2422 of the second elastic buckle 242 can abut against the inner side wall of the moving element 22, and the second elastic buckle 242 bends inwardly under the limit of the moving element 22. In order to block the movement element 22, the second detent 2422 has a locking surface 24221 and a guide surface 24222 arranged opposite to the locking surface 24221.

Thus, when the injection presses the protection case 21, it pushes the moving element 22 to slide in the opposite direction, and when the moving element 22 moves to the position separated from the second stopping point 2422, the second elastic catch 242 opens and returns to the original state. At the same time, the protective shell 21 pushes the moving element 22 to further compress the second elastic body 26. When the injection is completed, the drug delivery device is separated from the human skin. At this time, the second compressed elastic body 26 releases the elastic force and pushes the moving element 22 to perform the reverse movement. The locking surface 24221 and the guiding surface 24222 are both disposed obliquely along the direction of the reverse movement of the moving element 22, and when the moving element 22 abuts against the second clamping point 2422 again, the inner side wall thereof slides along the guiding surface 24222 of the second clamping point 2422. When the moving element 22 passes the second stopping point 2422 as a whole, the second elastic buckle 242 is opened again. At this time, the locking surface 24221 of the second elastic buckle 242 can abut against the end surface of the moving element 22 to axially limit the moving element 22, and the moving element 22 further axially limits the protective shell 21 to lock the protective shell 21, so as to prevent the needle of the injection assembly 30 from being exposed, so that the drug delivery device of the present embodiment meets the corresponding safety standard.

As mentioned above, the other end of the second elastic body 26 abuts against the rib 243 at the end of the activating element 24. Specifically, the ribs 243 are disposed at one end of the activating element 24 close to the rear cover 13, and the ribs 243 are symmetrically distributed at two sides of the end. And the ribs 243 at two sides can extend out from the limiting sliding groove 124, so that the other end of the elastic body 26 abuts against the extending part of the rib 243.

When the injection is completed, the second elastomer 26, which is compressed, releases the spring force. The second elastic body 26 pushes the moving element 22 in the reverse direction and simultaneously pushes the activating element 24 toward the rear cover 13. Thus, when the activation element 24 strikes the rear cap 13, an alert tone may be emitted to alert the user that the injection has been completed.

As shown in fig. 11 and 12, the injection assembly 30 is used for automatic injection of the liquid medicine under the driving of the energy source assembly 20. The injection assembly 30 includes: a container 31, a needle 32 and a container carrier 33.

The container 31 is used for storing a liquid medicine to be injected, and has one end connected to the needle 32 and the other end having an opening. The pushing member 23 extends into the container 31 from the opening and can drive the rubber plug 231 thereon to perform an axial movement in the container 31. Thus, the rubber plug 231 can push the medical fluid in the container 31 out of the needle 32 by the propelling member 23. The needle head 32 is further sleeved with a needle cap 321, and the needle cap 321 is further sleeved with a protective cover 322.

The interior of the container holder 33 is designed to follow the contour of the shape of the container 31, the container 31 being accommodated in the container holder 33, the container holder 33 being further mounted in the protective shell 21. As described above, the presser foot 125 extending upward from the end surface of the inner race 12 abuts against the rear end of the container 31. Thus, the two presser feet 125 and the container 31 form a triangular structure, which is beneficial to ensuring that the container 31 can always keep stable when injection and vibration are applied.

In order to cooperate with the protective shell 21, the container bracket 33 is provided with a third buckle 331, a first limit block 332, a second limit block 333 and a fourth limit block 334. The third latch 331 is disposed away from the extension arm 214 of the inner housing 12, and further latches into the fifth latch groove 1127 of the second housing 112, so as to fix the container bracket 33.

The first limit blocks 332 are disposed on two sides of the container bracket 33, and two first limit blocks 332 are disposed on either side of the container bracket. The container bracket 33 is matched with the mounting groove 213 of the protective shell 21 through the first stop block 332 on the container bracket 33, so that the mounting stop of the container bracket 33 is realized.

The second limiting blocks 333 are disposed at two sides of the container bracket 33, and two second limiting blocks 333 disposed oppositely are disposed at any side. And the second limit block 333 on both sides is arranged in a staggered manner with the third fastener 331 and the first limit block 332. The extension arms 214 on the protective shell 21 are respectively clamped between the two second limiting blocks 333 on the corresponding sides. Thus, the installation limit of the container bracket 33 is realized.

The fourth stoppers 334 are disposed on both sides of the container bracket 33. Correspondingly, the corresponding position of the protective shell 21 is provided with a limiting groove 215 matched with the fourth limiting blocks 334 on the two sides. Thus, the protective shell 21 slides within the stroke limited by the limiting groove 215.

As shown in fig. 13, the cap assembly 40 is used to protect the needle 32 and its cap 321 and boot 322 in the injection assembly 30. The cap assembly 40 includes: a cap retainer 41 and a cap 42. The cap retainer 41 is located in the cap 42, and can be sleeved on the protective sleeve 322 of the needle 32 through an opening at one end when the cap 42 is fastened to the front end of the drug delivery device.

Specifically, the cap retainer 41 may be integrally formed by machining, which has the advantages of convenient processing and low cost. The cap retainer 41 is further provided with a fourth latch 411 extending inward, and the fourth latch 411 is disposed obliquely in the direction of pulling out the cap 42. In one embodiment, the fourth latch 411 is integrally formed with the cap retainer 41, and the forming manner may be stamping or the like. The number of the fourth hooks 411 is at least one, and when the number of the fourth hooks 411 is plural, the fourth hooks 411 are evenly distributed at intervals in the circumferential direction.

Correspondingly, a sixth clamping groove 3221 capable of being matched with the fourth buckle 411 is disposed on the protection cover 322. Thus, when the pen cap 42 is pulled out, the pen cap snap ring 41 can pull out the protection sleeve 322 together through the fourth buckle 411. Therefore, the protective sleeve 322 can be prevented from being discarded or lost at will, and the advantage of convenient use is achieved. And the inclination of the fifth catch 4211 facilitates gripping the outer wall of the shield 322 of the needle 32, thereby ensuring that the shield 322 is effectively pulled out in the axial direction.

The cap retainer 41 and the cap 42 may be an integral piece or a separate piece. When the two are separate members, in order to facilitate the cap snap ring 41 to be installed in the cap 42, a mounting sleeve 421 is vertically disposed at the bottom of the cap 42, and the mounting sleeve 421 and the cap 42 are coaxially disposed. The cap retainer 41 is engaged with the attachment sleeve 421.

Correspondingly, a fifth buckle 4211 obliquely arranged along the assembling direction is arranged on the inner side wall of the mounting sleeve 421, and a seventh clamping groove 412 capable of being matched with the fifth buckle 4211 is formed in the pen cap clamping ring 41. In one embodiment, the fifth latch 4211 is disposed on the inner sidewall of the mounting sleeve 421 in a central symmetry, and the seventh slot 412 on the cap snap ring 41 is disposed corresponding to the fifth latch 4211.

The cap retainer 41 can be inserted into the mounting sleeve 421 along the assembling direction, and the fifth buckle 4211 is obliquely arranged along the assembling direction, so that the cap retainer 41 can play a role in guiding during assembling, and can be prevented from being separated from the mounting sleeve 421 when the assembling is completed.

In addition, in order to facilitate the engagement between the cap retainer 41 and the protection cover 322 and the mounting cover 421, the cap retainer 41 should have a certain deformation amount. In order to achieve the above purpose, the cap retainer 41 is disposed through, and the other end of the cap retainer 41 is further provided with a plurality of grooves 413 extending to the end. So, through setting up a plurality of bar grooves 413 for cap snap ring 41 can take place deformation in radial direction, and then can assemble better between protective sheath 322 and installation cover 421, overcomes the error in the assembly.

In summary, the energy assembly of the drug delivery device of the present invention has multiple functions, and assists in fixing the propelling member and also can lock the moving element after injection. In addition, the rear cover can be impacted to give out a prompt sound after the injection is finished so as to remind a user that the injection is finished. Thus, the structure of the drug delivery device is greatly simplified due to the integration of multiple functions of the energy source assembly.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. A drug delivery device, characterized in that it comprises: an energy source assembly and an injection assembly;

the protective shell is axially arranged in a sliding manner, and one end of the protective shell abuts against the moving element; the moving element axially and slidably wraps the activation element and can axially control the pushing component inside the activation element to release along with the sliding of the protective shell; the motion element is locked by the activation element when the motion element slides reversely to the limit position under the pushing of the energy element;

2. A drug delivery device as in claim 1, wherein the activation element is provided with first resilient catches on both sides;

3. A drug delivery device according to claim 1 or 2, wherein the energy source element comprises a first elastomer; the elastic body is accommodated in the propelling component, is initially in a compressed state and can push the propelling component to push out the liquid in the container when being stretched.

4. A drug delivery device as in claim 1, wherein the activation element is provided with second resilient catches on both sides;

5. The drug delivery device of claim 1 or 4, wherein the energy source element comprises an elastomer two;

6. The drug delivery device of claim 1, further comprising a rear cap that snaps over a trailing end of the drug delivery device; the activation element is pushed by the energy source element to impact the rear cover to give an end-of-injection prompt sound.

7. The drug delivery device of claim 1, wherein the energy source element comprises: an elastomer I and an elastomer II;

8. The drug delivery device of claim 1, further comprising a housing assembly comprising: the rear cover is arranged at the rear end of the outer sleeve;

9. The drug delivery device of claim 8, wherein two outwardly angled pressure feet extend from an end surface of the inner sleeve, the pressure feet abutting against the reservoir of the syringe assembly.

10. The drug delivery device of claim 1, further comprising a pen cap assembly comprising: the pen cap comprises a pen cap and a pen cap clamping ring positioned in the pen cap;

the pen cap clamping ring is sleeved on the protective sleeve of the needle head when the pen cap is buckled at the front end of the medicine delivery device; the pen cap clamping ring is also provided with a buckle extending inwards, and the buckle is obliquely arranged along the pulling-out direction of the pen cap; the protective sleeve is provided with a clamping groove matched with the buckle.