CN112843389A

CN112843389A - Automatic injection pen

Info

Publication number: CN112843389A
Application number: CN202110254352.XA
Authority: CN
Inventors: 舒乐; 易林川; 杜嘉文
Original assignee: Suzhou Jiashu Medical Technology Co ltd
Current assignee: Suzhou Jiashu Medical Technology Co ltd
Priority date: 2021-03-09
Filing date: 2021-03-09
Publication date: 2021-05-28

Abstract

The invention relates to an automatic injection pen, which comprises an injection pen body, the injection front end of the injection pen body is movably provided with a pen cap, the injection pen body comprises an outer shell, an observation window is arranged on the outer shell, an inner shell device is arranged in the outer shell, and the inner shell The inside of the device is provided with a PFS device, and the rear end of the inner shell device is provided with a propulsion device. The propulsion device has a disable function, thus, when the injection is completed, the effective single injection limit can be realized. When the user wants to perform a second injection, the second injection is terminated, avoiding the repeated use of the automatic injector and improving the injection safety. sex. The propulsion device is equipped with a sounding component, which can generate a more obvious "card position" prompt sound through collision and friction with the push rod component when the injection is completed. Know that the injection is complete.

Description

Automatic injection pen

Technical Field

The invention relates to an injection pen, in particular to an automatic injection pen.

Background

The existing disposable automatic injector has very complex design principle, leads to a plurality of parts which are generally more than 15, so the reliability is not high, the assembly difficulty is large, and the final product cost is too high.

CN110237366A discloses a medical injection device, which comprises an outer barrel and a pen cap, one end of the outer barrel is provided with a detachable medicine bin, a replaceable standard card type medicine bottle is arranged in the medicine bin, one end of the inner part of the outer barrel close to the medicine bin is provided with a fixed sleeve, the inner axial movement of the fixed sleeve is provided with a push rod seat, the inner part of the push rod seat is provided with a transmission ring which can be meshed with the end part of a transmission rod, the outer side of the transmission rod is sleeved with a ratchet ring which can axially slide, one end face of the ratchet ring is in one-way meshing with the inner part of the outer barrel, the other end of the ratchet ring is axially provided with a first spring, one end of the push rod seat is axially provided with a push rod seat spring which is propped against the outer barrel.

CN109999272A discloses a disposable adjustable injection device for insulin injection, which comprises a protective cover, a disposable needle, a pen core sleeve, a main body shell, a pen core and an adjusting component, one end of the main body shell is provided with a second boss, the outside of the second boss is provided with a refill sleeve, one end of the pencil lead sleeve is provided with a thread groove, the external thread of the second boss is in threaded connection with the thread groove, the other end of the refill sleeve is provided with a first boss, the outside of the first boss is connected with a disposable needle head through threads, a steel needle is inserted in the disposable needle head, a pen core is arranged in the pen core sleeve, a protective cover is sleeved outside the pen core sleeve, the other end of main body cover is provided with adjusting part, main body cover's internally mounted has fixed sleeve, fixed sleeve's one end outside protrusion has flange portion.

CN102264417A discloses an injection device comprising: a long housing; a container carrier having a medicament container to which a needle is mounted; a puncture device comprising a separation sleeve, a preloaded puncture spring device and a puncture holding device, wherein said preloaded puncture spring device is capable of acting on said separation sleeve and thereby on said container carrier for a sliding movement of said container and needle, and said puncture holding device is capable of holding said puncture spring device in a loaded state; injection means comprising a plunger rod, pre-loaded injection spring means and injection retaining means, wherein the plunger rod is arranged to act on a stopper in the medicament container, the pre-loaded injection spring means is adapted to act on the plunger rod such that the stopper is displaced within the container, and the injection retaining means is adapted to retain the injection spring means in a loaded state; retraction means comprising a preloaded retraction spring and retraction holding means, wherein the preloaded retraction spring is arranged to act on the separation sleeve and thereby on the container carrier, and the retraction holding means is capable of holding the retraction spring in a loaded state; a puncture sequence initiating means capable of acting on a puncture trigger means arranged on said separation cannula for disconnecting said puncture holding means; an injection trigger means provided on said separation sleeve and capable of disconnecting said injection holding means to initiate an injection sequence when the separation sleeve and the plunger rod are moved to a specific position; and retraction triggering means arranged on said separation sleeve and capable of disconnecting said retraction holding means for initiating needle retraction when said plunger rod has been moved to a certain position; characterized in that the device further comprises damping means comprising a compartment containing a volume of a highly viscous liquid and being partly defined by the outer surface of the plunger rod and the inner surface of the cap, wherein the compartment is arranged with a channel through which the liquid is forced only upon initiation of the injection sequence, such that the volume within the compartment decreases with movement of the plunger rod in the container during the entire injection sequence and thereby damping shear forces are generated.

In view of the above-mentioned drawbacks, the present designer is actively making research and innovation to create an automatic injection pen, so that the automatic injection pen has industrial value.

Disclosure of Invention

In order to solve the above technical problems, an object of the present invention is to provide an automatic injection pen.

The invention relates to an automatic injection pen, which comprises an injection pen body, wherein a pen cap is movably arranged at the injection front end of the injection pen body, wherein: the injection pen body is including the shell, be equipped with the observation window on the shell, be provided with the inner shell device in the shell, the rear end of inner shell device is provided with advancing device, the last sound production subassembly that is provided with of advancing device, the inner shell device is including the inner shell body, the endotheca subassembly is installed to the front end of inner shell body, be provided with the PFS device in the endotheca subassembly, advancing device is including last main shaft, it is equipped with down the main shaft to go up the cover on the main shaft, the inside push rod subassembly that is provided with of main shaft down, be provided with the main spring between push rod subassembly and the last main shaft, the cover is equipped with slider assembly on the main shaft down, be provided with secondary spring down between main shaft and the slider assembly.

Further, the above automatic injection pen, wherein, endotheca subassembly tail end is provided with the buffering subassembly, the buffering subassembly is the silica gel pad.

Furthermore, in the automatic injection pen, the inner shell body is provided with a guide groove, the inner sleeve component is provided with a locking block, and the outer side of the inner sleeve component is further provided with a limiting protrusion.

Furthermore, in the automatic injection pen, the lower main shaft includes a lower shaft cavity, the front end of the lower shaft cavity is distributed with guide front flaps in pairs, the guide front flaps are provided with stop protruding points, the middle part of the lower shaft cavity is provided with a locking protruding block, the rear end of the lower shaft cavity is provided with a one-way guide protruding block, and the one-way guide protruding block is provided with an axial guide slope.

Furthermore, the automatic injection pen is characterized in that the upper main shaft comprises a shaft base, an upper shaft rod is arranged on the shaft base, and a main spring is sleeved on the upper shaft rod.

Furthermore, foretell automatic injection pen, wherein, push rod assembly is including the push rod body, the front end of push rod body is provided with the reservation groove, the middle section of push rod body is provided with the draw-in groove, the tail end of push rod body is provided with the trigger groove, when just finishing injecting, sound production subassembly and trigger groove contact.

Furthermore, in the automatic injection pen, the slider assembly comprises a slider body, a plurality of reinforcing ribs are distributed on the outer wall of the slider body, and a plurality of guide grooves are distributed on the inner wall of the slider body.

Furthermore, the above automatic injection pen, wherein the PFS device includes a PFS body, the injection end of the PFS body is provided with a needle protection cover, the tail end of the PFS body is provided with a plunger, and the plunger is a silica gel plug.

Furthermore, the automatic injection pen is characterized in that the sounding component comprises a sounding block, and an energy storage block is arranged in the sounding block.

Still further, in the automatic injection pen, the inner sleeve assembly includes an inner sleeve body, and a locking protrusion is outwardly disposed at a tail section of the inner sleeve body.

By the scheme, the invention at least has the following advantages:

1. by means of the mutual matching of the sliding block assembly and the inner shell device, after injection is completed, effective injection single-time limiting can be achieved, when a user wants to perform secondary injection, the sliding block assembly can be limited, the secondary injection is stopped, the automatic injector is prevented from being repeatedly used, and the injection safety is improved.

2. The sounding component is configured, when the injection is finished, a relatively obvious 'clamping position' prompt sound can be generated through collision and friction with the push rod component, and a user can know that the injection is finished without staring at the injection condition of the liquid medicine in the observation window. At the same time, excessive squeezing of the injection area can be avoided.

3. Adopt the silica gel pad to constitute buffering subassembly, can carry out spacingly to the PFS device of follow-up installation, and guarantee the smooth work of PFS device during the injection.

4. The whole structure is simple, the manufacture and the assembly are convenient, and the use is convenient.

The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.

Drawings

Fig. 1 is an exploded view of the present automatic injection pen.

Fig. 2 is a schematic structural view of the inner shell device.

Fig. 3 is a schematic structural view of the inner sleeve assembly.

Fig. 4 is a schematic view of the structure of the lower main shaft.

Fig. 5 is a schematic view of the structure of the upper spindle.

FIG. 6 is a schematic structural view of a slider assembly.

Fig. 7 is a schematic structural view of the sounding module.

Fig. 8 is a schematic view of the assembled propulsion device.

Fig. 9 is an overall sectional structure diagram of the present automatic injection pen.

Fig. 10 is a schematic diagram of the injection start stage of the present automatic injection pen.

Fig. 11 is a schematic structural diagram of the penetration stage of the automatic injection pen.

FIG. 12 is a schematic diagram of the automatic injection pen immediately after the injection phase.

Fig. 13 is a schematic diagram of the reset phase of the automatic injection pen.

The meanings of the reference symbols in the drawings are as follows.

1 upper main shaft 2 lower main shaft

3 sliding block assembly 4 push rod assembly

5 sounding subassembly 6 caps

7 outer shell 8 buffer component

9 inner shell device 10 inner sleeve component

11 needle protection cover 12 PFS body

13 plunger 14 observation window

15 main spring and 16 auxiliary springs

17 one-way guide projection 18 locking projection

19-stop bump 20 clamping groove

21 reserve groove 22 trigger groove

23 guide groove of reinforcing rib 24

25 locking block 26 guide groove

27 energy storage block 28 limiting projection

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

An automatic injection pen as shown in fig. 1 to 13 comprises an injection pen body, wherein a pen cap 6 is movably arranged at the injection front end of the injection pen body, and the automatic injection pen is characterized in that: the injection pen body comprises a shell 7, and an observation window 14 is arranged on the shell 7. Meanwhile, an inner shell device 9 is arranged in the outer shell 7. Specifically, the inner housing device 9 includes an inner housing body, and an inner housing assembly 10 is mounted at a front end of the inner housing body. To facilitate administration of the injection, a PFS device is provided within the liner assembly 10. Also, the rear end of the inner housing means 9 is provided with propulsion means with disabling functionality, taking into account the need for injection propulsion. In order to give the user the necessary injection completion indication, the propelling device is provided with a sound production assembly 5. Due to the existence of the sounding component 5, a proper sound prompt can be given to the user after the injection is finished. In view of practical use, the propulsion device comprises an upper main shaft 1, a lower main shaft 2 is sleeved on the upper main shaft 1, a push rod assembly 4 is arranged inside the lower main shaft 2, and a main spring 15 is arranged between the push rod assembly 4 and the upper main shaft 1. Furthermore, the lower main shaft 2 is sleeved with a sliding block assembly 3, an auxiliary spring 16 is arranged between the lower main shaft 2 and the sliding block assembly 3, and the front end of the lower main shaft 2 is provided with a sound production assembly 5. The secondary spring 16 has two functions. Firstly, the method comprises the following steps: the provision of the activation force, such that the user needs to provide a certain force before injection, reduces the possibility of false triggering. Secondly, the method comprises the following steps: the slider assembly 3 and the inner housing means 9 are pushed out after injection so that the needle carried on the PFS body 12 is not exposed to the inner housing means 9. In actual use, the disabling function can be triggered only after the slider assembly 3 is pushed past the one-way guide projection 17 of the lower main shaft 2.

In a preferred embodiment of the present invention, in order to achieve better storage of the PFS device after being mounted in place and ensure stable combination between the PFS assembly and the inner sleeve assembly 10, and avoid unnecessary shaking due to tolerance, the tail end of the inner sleeve assembly 10 is provided with a buffering assembly 8. By means of the buffer assembly 8, the buffer protection of the PFS assembly can be effectively realized, a proper fixing effect can be realized, and a gap caused by assembly tolerance is eliminated. Meanwhile, in order to realize effective contact limiting and not influence the necessary relative movement of each component in the subsequent use period, the buffer component 8 adopted by the invention is a silica gel pad. In order to realize necessary motion guiding and controlling, a guide groove 26 is formed on the inner shell body, and a locking block 25 is arranged on the inner sleeve component 10. Thus, after the injection is finished, the inner sleeve assembly 10 can be limited from moving outwards by the existence of the locking block 25. And, the outside of the inner sleeve component is also provided with a limiting bulge 28 which can limit the backward movement of the inner shell device 9 when in the non-injection original state, thereby avoiding unnecessary shaking.

Further, in order to smoothly guide the plunger 13 in the PFS device to move forward and to be matched with the subsequent sounding component 5, the lower spindle 2 adopted by the invention comprises a lower shaft cavity, guide front lobes are distributed at the front end of the lower shaft cavity in pairs, and stop bumps 19 are arranged on the guide front lobes. Meanwhile, the middle part of the lower shaft cavity is provided with a locking lug 18, the rear end of the lower shaft cavity is provided with a one-way guiding lug 17, and the one-way guiding lug 17 is provided with an axial guiding slope surface.

Seen in combination with practical implementation, the upper spindle 1 comprises a spindle base, an upper shaft lever is arranged on the spindle base, and a main spring 15 is sleeved on the upper shaft lever. Meanwhile, the push rod assembly 4 comprises a push rod body, and a preformed groove 21 is formed in the front end of the push rod body. Thus, in the unused state, the energy storage block 27 of the sound generating component is in a natural state rather than a bending state before sound generation, and the function failure caused by long-time storage is prevented. The middle section of the push rod body is provided with a clamping groove 20, and the tail end of the push rod body is provided with a trigger groove 22. In the non-injection stage, the locking lug 18 is arranged at the middle part of the clamping groove 20 and the lower shaft cavity. Immediately before the end of injection, the sound emitting member 5 is in contact with the trigger groove 22.

Meanwhile, the sliding block component 3 comprises a sliding block body, a plurality of reinforcing ribs 23 are distributed on the outer wall of the sliding block body, and a plurality of guide grooves 24 are distributed on the inner wall of the sliding block body. During use, the guide groove 24 limits radial deviation of the locking lug 18 on one hand, and on the other hand, the tail end of the guide groove does not penetrate through to form a step and is matched with the one-way guide lug 17 and the push rod, so that the sliding block 3 is prevented from moving leftwards before injection, and a limiting effect is achieved after injection, and the guide lug 17 is prevented from reentering the sliding block 3.

Still further, the PFS device includes a PFS body 12, a needle protecting cover 11 is disposed at an injection end of the PFS body 12, a plunger 13 is disposed in a tail end of the PFS body 12, and the plunger 13 is a silica gel plug. The sound production component 5 comprises a sound production block, and an energy storage block 27 is arranged in the sound production block. Meanwhile, the inner sleeve assembly 10 includes an inner sleeve body, and a locking protrusion 18 is outwardly provided at a rear section of the inner sleeve body.

The working principle of the invention is as follows:

the method comprises the following steps: and (5) a starting stage.

As shown in fig. 10, the cap is removed and the filling end of the injector with the inner housing means 9 is placed on the skin to be injected and forced downwards.

Step two: and (5) a puncturing stage.

After a short idle stroke, the inner housing means 9 starts to push the slider assembly 3 upwards relative to the needle until the needle contacts the skin, as shown in fig. 11. At this point, pressure continues to be applied. The needle begins to penetrate into the skin and the inner housing means 9 pushes the slider assembly 3 to continue its upward movement until the inner housing means 9 is moved to the extreme position. At this time, a predetermined subcutaneous puncture depth is reached and the puncture is ended. The extreme position during the implementation of the invention is mainly that the inner housing means 9 is exposed to a part of the outer housing 7, but not completely into the outer housing 7.

Specifically, during lancing, the lower end of the slider assembly 3 moves over the locking tab 18. Thus, the locking projection 18 and the locking groove 20 which are originally in the locking state are mutually released due to the loss of the limiting function of the slide block component 3. Subsequently, the main spring 15 slides along the axial slope under the pushing force of the main spring 15, and the locking protrusion 18 is elastically deformed outward until the catching groove 20 of the push rod assembly 4 is completely separated from the catching position of the locking protrusion 18, so that the main spring 15 pushes the push rod assembly 4 to continue forward.

The push rod assembly 4 then expands the energy storage mass 27 of the sound emitting assembly 5. The sounding component 5 is driven to move and stops moving after abutting against the stop bump 19 of the lower spindle 2.

Eventually, the front of the push rod assembly 4 contacts and abuts the plunger 13 within the PFS body 12.

Step three: and (4) an injection stage.

As shown in fig. 12, the PFS body 12 and the inner sleeve assembly 10 are snap-fitted and fixed. At this time, the push rod assembly 4 and the plunger 13 are pushed continuously by the force of the main spring 15, and the medicine in the PFS body 12 is injected into the subcutaneous part of the patient until the plunger 13 reaches the bottom end of the PFS body 12, and the injection is finished.

When the injection is about to be finished, the energy storage block of the sound production assembly 5 enters the trigger groove 22 of the push rod assembly 4, and the sound production assembly 5 collides with the push rod assembly 4 to produce an injection finishing prompt sound. Thereby, the injection is completed. Avoiding the need for the user to look at the viewing window 14 in real time in order to know the current injection progress. Also, unnecessary squeezing and damage to the injection area due to over-pressing of the auto-injector, as the user does not know whether the injection has been completed, can be avoided. Meanwhile, waiting confirmation is not needed after injection is finished, and a clear prompt can be given.

Step four: a reset phase.

The auto-injector is removed from the injection zone as shown in fig. 13. At this time, the secondary spring 16 pushes the slider assembly 3 and the inner housing device 9 to retreat, and when the upper end of the slider assembly 3 contacts the one-way guide projection 17, the upper end of the slider assembly 3 slides along the axial guide slope of the one-way guide projection 17. Thereafter, the one-way guide projection 17 is elastically deformed inward, and then released from the slider assembly 3 and restored to the deformation. At this time, the upper end of the guide groove of the inner shell device 9 abuts against the locking block 25 of the inner sleeve assembly, and the injection process is finished. In the present state, the one-way guide projection 17 has escaped from the slider assembly 3 and is enclosed within the housing 7. Since the one-way guide projection 17 cannot be reversed to re-enter the slide assembly 3, if the injector repeats step one, the entire injection process will be jammed, preventing reuse of the auto-injector.

The invention has the following advantages by the aid of the character expression and the accompanying drawings:

1. by means of mutual matching of the sliding block assembly and the inner shell device, the propelling device has a forbidden function, after injection is completed, effective injection single-time limiting can be achieved, when a user wants to perform secondary injection, the sliding block assembly can be limited, the secondary injection is stopped, reuse of the automatic injector is avoided, and injection safety is improved.

3. Adopt the silica gel pad to constitute the buffering subassembly, when satisfying PFS subassembly and endotheca subassembly and combining, can carry out spacingly to the PFS device of follow-up installation, and guarantee the smooth work of PFS device during the injection.

Furthermore, the indication of the orientation or the positional relationship described in the present invention is based on the orientation or the positional relationship shown in the drawings, and is only for convenience of describing the present invention and simplifying the description, but does not indicate or imply that the indicated device or configuration must have a specific orientation or be operated in a specific orientation configuration, and thus, should not be construed as limiting the present invention.

The terms "primary" and "secondary" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "primary" or "secondary" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

Also, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "connected" and "disposed" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; the two components can be directly connected or indirectly connected through an intermediate medium, and the two components can be communicated with each other or mutually interacted. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations. And it may be directly on the other component or indirectly on the other component. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, refer to an orientation or positional relationship illustrated in the drawings, which are used for convenience in describing the invention and to simplify the description, and do not indicate or imply that the device or component being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the invention.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, it should be noted that, for those skilled in the art, many modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims

1. An automatic injection pen, comprising an injection pen body, and the injection front end of the injection pen body is movably provided with a pen cap, characterized in that: the injection pen body includes a casing, and the casing is provided with an observation window, so that the The outer shell is provided with an inner shell device, the rear end of the inner shell device is provided with a propulsion device, the propulsion device is provided with a sounding component, the inner shell device includes an inner shell body, and the front end of the inner shell body is provided with An inner sleeve assembly is installed, a PFS device is arranged in the inner sleeve assembly, the propulsion device includes an upper main shaft, a lower main shaft is sleeved on the upper main shaft, and a push rod assembly is arranged inside the lower main shaft, and the A main spring is arranged between the push rod assembly and the upper main shaft, a slider assembly is sleeved on the lower main shaft, an auxiliary spring is arranged between the lower main shaft and the slider assembly, and a sounding assembly is arranged at the front end of the lower main shaft .

2 . The automatic injection pen according to claim 1 , wherein the end of the inner sleeve component is provided with a buffer component, and the buffer component is a silicone pad. 3 .

3 . The automatic injection pen according to claim 1 , wherein the inner shell body is provided with a guide groove, the inner sleeve assembly is provided with a locking block, and the outer side of the inner sleeve assembly is further Set the limit protrusion.

4 . The automatic injection pen according to claim 1 , wherein the lower main shaft comprises a lower shaft cavity, and the front ends of the lower shaft cavity are distributed with guiding front flaps in pairs, and the guiding front A stop bump is arranged on the petal, a locking bump is arranged in the middle part of the lower shaft cavity, a one-way guide bump is arranged at the rear end of the lower shaft cavity, and an axial direction is arranged on the one-way guide bump. Guide slope.

5 . The automatic injection pen according to claim 1 , wherein the upper main shaft comprises a shaft base, an upper shaft rod is arranged on the shaft base, and a main spring is sleeved on the upper shaft rod. 6 . .

6 . The automatic injection pen according to claim 1 , wherein the push rod assembly includes a push rod body, the front end of the push rod body is provided with a reserved groove, and the middle section of the push rod body is provided with a reserved groove. 7 . A card slot is provided, and a trigger slot is arranged at the tail end of the push rod body. When the injection is about to end, the sounding component is in contact with the trigger slot.

7 . The automatic injection pen according to claim 1 , wherein the slider assembly comprises a slider body, the outer wall of the slider body is distributed with a plurality of reinforcing ribs, and the inner wall of the slider body There are several guide grooves distributed.

8 . The automatic injection pen according to claim 1 , wherein the PFS device comprises a PFS body, the injection end of the PFS body is provided with a needle protection cover, and the tail end of the PFS body is provided with a protective cover. 9 . There is a plunger, and the plunger is a silicone plug.

9 . The automatic injection pen according to claim 1 , wherein the sounding assembly comprises a sounding block, and an energy storage block is arranged in the sounding block. 10 .

10 . The automatic injection pen according to claim 1 , wherein the inner sleeve assembly comprises an inner sleeve body, and a locking projection is provided outwardly from the tail section of the inner sleeve body. 11 .