CN218833303U

CN218833303U - Power mechanism and drug delivery device

Info

Publication number: CN218833303U
Application number: CN202221838887.8U
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: 2023-04-11
Anticipated expiration: 2032-07-18

Abstract

The utility model provides a power unit and drug delivery device, wherein, power unit 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 axially and slidably wraps the activation element and can axially control the pushing component in the activation element to release along with the sliding of the protective shell; the moving element is locked by the activating element when the moving element slides reversely to the limit position under the pushing of the energy source element. The utility model discloses a power unit has multiple functions concurrently, and its supplementary propulsion member's installation is fixed, can also realize injecting the lock of accomplishing back motion element and die. 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 power mechanism integrates multiple functions, which greatly simplifies the structure of the drug delivery device.

Description

Power mechanism and drug delivery device

Technical Field

The utility model relates to the technical field of medical equipment, especially, relate to a power unit and 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, in the conventional drug delivery device, the structure of the power mechanism is complicated, which is not favorable for assembling the product and results in high cost. Therefore, it is necessary to provide a further solution to the above problems.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a power unit and drug delivery device to overcome the not enough that exists among the prior art.

In order to solve the technical problem, the technical scheme of the utility model is that:

a power mechanism, comprising: 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 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 moving element is locked by the activating element when the moving element slides reversely to the limit position under the pushing of the energy source element.

As an improvement of the power mechanism of the utility model, two sides of the activation element are provided with first elastic buckles;

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 power mechanism of the utility model, the energy element comprises an elastic body I; 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 the improvement of the power mechanism of the utility model, the first elastic body is a spring.

As an improvement of the power mechanism of the utility model, two sides of the activation element are provided with second elastic buckles;

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 an improvement of the power mechanism of the utility model, the second clamping point is provided with a locking surface and a guide surface arranged opposite to the locking surface; the locking surface and the guide surface are obliquely arranged along the direction of the reverse movement of the moving element.

As an improvement of the power mechanism of the utility model, the energy element comprises an elastic body II;

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 the improvement of the power mechanism of the utility model, the elastic body II is a spring.

a drug delivery device comprising a powered mechanism as described above.

As an improvement of the drug delivery device of the present invention, the drug delivery device further comprises a rear cover 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.

Compared with the prior art, the beneficial effects of the utility model are that: the utility model discloses a power unit has multiple functions concurrently, and its supplementary propulsion member's installation is fixed, can also realize injecting the lock of accomplishing back motion element and die. 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 power mechanism integrates multiple functions, which greatly simplifies 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 needed to be 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 a power mechanism in an embodiment of a drug delivery device according to the present invention;

FIG. 2 is a perspective view of the protective shell of FIG. 1;

FIG. 3 is a sectional view of the assembled state of the protective shell and the housing;

FIG. 4 is a perspective view of the moving element of FIG. 1;

FIG. 5 is an exploded perspective view of the first elastomer, the pusher member, and the activation element of FIG. 1;

FIG. 6 is a perspective view of the activation element of FIG. 1;

FIG. 7 is a perspective view of the first resilient latch of FIG. 6;

fig. 8 is a perspective view of the second elastic buckle in fig. 6.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

An embodiment of the present invention provides a drug delivery device, which acts on the skin of a human body, and is used for automatically injecting drugs such as insulin to the human body.

As shown in fig. 1, the drug delivery device of the present embodiment comprises: a power mechanism 20, a housing 112, and a rear cover 13.

The power mechanism 20 is for driving the drug delivery device to perform an injection action, and comprises: 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 serves to prevent the needle of the drug delivery device from being exposed to the outside after the injection is completed, while also enabling the movement element 22 to be pushed to activate the drug delivery device for injection.

As shown in fig. 2 and 3, the protective shell 21 is axially disposed therethrough and slidably mounted in the 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, a limiting strip 1124 and a limiting ring 1125 are disposed in the housing 112. The limiting strip 1124 is disposed on the inner sidewall of the 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 housing 112. In addition, a third slot 1126 is disposed at the front end of the housing 112 and the retainer ring 1125.

In this manner, when the protective shell 21 is assembled with the housing 112, the protective shell 21 is inserted from the front end thereof with respect to the housing 112. At this time, the two T-shaped snaps on the protective shell 21 are engaged with the front end of the housing 112 and the third slot 1126 on the retainer 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 housing 112.

As shown in FIG. 4, 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 disposed extension arms 214, and the ends 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. 5, 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 out of the container 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. 6, 7 and 8, 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: a first elastic arm 2411 connected to the main body of the activation element, a first click 2412 disposed at the inner side of the end of the first elastic arm 2411, and a bump 2413 disposed at the outer side of the end 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 main body of the activation element, 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 inward under the limit of the moving element 22 of the second elastic buckle 242. 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 compressed elastomer 26 releases the elastic 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.

To sum up, the utility model discloses a power unit has multiple functions concurrently, and its supplementary propulsion member's installation is fixed, can also realize that the injection accomplishes the lock of back motion element and dies. 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 power mechanism integrates multiple functions, which greatly simplifies the structure of the drug delivery device.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. 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 power mechanism, characterized in that the power mechanism comprises: a protective shell, a motion element, a propulsion member, an activation element, and an energy element;

2. The power mechanism as claimed in claim 1, wherein the two sides of the activation element are provided with first elastic buckles;

3. A power mechanism according to claim 1 or 2, wherein the power 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. The power mechanism as claimed in claim 3, wherein the first elastic body is a spring.

5. The power mechanism as claimed in claim 1, wherein the two sides of the activation element are provided with second elastic buckles;

6. The power mechanism as claimed in claim 5, wherein the second clamping point has a locking surface and a guiding surface opposite to the locking surface; the locking surface and the guide surface are obliquely arranged along the direction of the reverse movement of the moving element.

7. The power mechanism according to any one of claims 1, 5 and 6, wherein the energy source element comprises a second elastic body;

8. The power mechanism as claimed in claim 7, wherein the second elastic body is a spring.

9. A drug delivery device characterised in that it comprises a power mechanism according to any of claims 1 to 8.

10. The drug delivery device of claim 9, further comprising a rear cap snap-fitted to the 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.