CN112843389B

CN112843389B - An automatic injection pen

Info

Publication number: CN112843389B
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: 2025-11-04
Anticipated expiration: 2041-03-09
Also published as: CN112843389A

Abstract

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, 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, a PFS device is arranged in the inner shell device, and a propelling device is arranged at the rear end of the inner shell device. The pushing device has a disabling function, so that the single limit of effective injection can be realized after the injection is finished, and when a user wants to perform secondary injection, the secondary injection is stopped, the repeated use of the automatic injector is avoided, and the injection safety is improved. The propelling device is provided with the sounding component, so that a relatively obvious 'clamping' prompt tone is generated through collision and friction with the push rod component when injection is finished, and a user does not need to stare at the injection condition of the liquid medicine in the observation window, so that the user can know that injection is finished.

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, so that parts are numerous and are generally more than 15, the reliability is low, the assembly difficulty is high, and the final product cost is too high.

CN110237366a discloses a medical injection device, including urceolus and pen cap, the one end of urceolus is provided with detachable medicine storehouse, be provided with removable standard card formula medicine bottle in the medicine storehouse, the inside of urceolus is close to the one end of medicine storehouse and is provided with fixed cover, the inside axial displacement of fixed cover is provided with the push rod seat, the inside of push rod seat is provided with the transmission ring that can mesh with the tip of transfer line, but the ratchet ring of axial slip has been cup jointed in the outside of transfer line, the one end terminal surface and the inside unidirectional engagement of urceolus of ratchet ring, the other end axial of ratchet ring is provided with first spring, the one end axial of push rod seat is provided with the push rod seat spring that withstands with the urceolus, the one end of push rod passes the push rod seat and stretches into in the standard card formula medicine bottle and link to each other with the ejector pad.

CN109999272a discloses a disposable adjustable injection device for insulin injection, including visor, disposable syringe needle, refill cover, main body casing, refill and adjusting part, the one end of main body casing is provided with the second boss, the externally mounted of second boss has the refill cover, the screw thread groove has been seted up to the one end of refill cover, the external screw thread and the mutual spiro union of screw thread groove of second boss, the other end of refill cover is provided with first boss, there is disposable syringe needle outside of first boss through threaded connection, the inside grafting of disposable syringe needle has the steel needle, the internally mounted of refill cover has the refill, the visor has been cup jointed to the outside of refill cover, the other end of main body casing is provided with adjusting part, the internally mounted of main body casing has fixed sleeve, the outside protrusion of one end of fixed sleeve has flange portion.

CN102264417a discloses an injection device comprising an elongated housing, a container carrier having a medicament container to which a needle is mounted, a piercing means comprising a separation sleeve, preloaded piercing spring means and a piercing holder, wherein the preloaded piercing spring means is capable of acting on the separation sleeve and thereby on the container carrier to cause a sliding movement of the container and needle and the piercing holder is capable of holding the piercing spring means in a loaded state, injection means comprising a plunger rod, preloaded injection spring means and injection holder, wherein the plunger rod is arranged to act on a stopper in the medicament container, the preloaded injection spring means being capable of acting on the plunger rod to cause a displacement of the stopper in the container and the injection holder being capable of holding the injection spring means in a loaded state, retraction means comprising preloaded retraction springs and holder means, wherein the preloaded retraction springs are arranged to act on the separation sleeve and thereby on the container carrier and the holder are capable of holding the piercing spring means in a loaded state, injection means comprising a plunger rod, preloaded injection spring means and injection holder and a plunger rod holder being capable of acting on the separation sleeve and a specific trigger sequence of stopping the separation sleeve and holding the injection holder, retraction means being arranged to trigger the separation sleeve and trigger the release sequence to be moved when the separation sleeve and the needle holder are set in a released position, which is arranged on the separation sleeve and which is capable of breaking the retraction holding means for initiating needle retraction when the 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 highly viscous liquid and being defined in part by an outer surface of the plunger rod and an inner surface of the cap, wherein the compartment is arranged with a channel through which the liquid is forced only when the injection sequence is initiated, such that the volume within the compartment decreases with the movement of the plunger rod in the container during the whole injection sequence and thereby generates damping shear forces.

In view of the above-mentioned drawbacks, the present inventors have actively studied and innovated to create an automatic injection pen that has a more industrially useful value.

Disclosure of Invention

In order to solve the technical problems, the invention aims to provide an automatic injection pen.

The automatic injection pen comprises an injection pen body, wherein 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, a propelling device is arranged at the rear end of the inner shell device, a sounding component is arranged on the propelling device, the inner shell device comprises an inner shell body, an inner sleeve component is arranged at the front end of the inner shell body, a PFS device is arranged in the inner sleeve component, the propelling device comprises an upper main shaft, a lower main shaft is sleeved on the upper main shaft, a push rod component is arranged in the lower main shaft, a main spring is arranged between the push rod component and the upper main shaft, a sliding block component is sleeved on the lower main shaft, an auxiliary spring is arranged between the lower main shaft and the sliding block component, and the sounding component is arranged at the front end of the lower main shaft.

Further, in the automatic injection pen, a buffer component is arranged at the tail end of the inner sleeve component, and the buffer component is a silica gel pad.

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

Still further, the automatic injection pen is characterized in that the lower spindle comprises a lower spindle cavity, guide front petals are distributed at the front end of the lower spindle cavity in pairs, stop protruding points are arranged on the guide front petals, a locking protruding block is arranged at the middle part of the lower spindle cavity, a unidirectional guide protruding block is arranged at the rear end of the lower spindle cavity, and an axial guide slope is arranged on the unidirectional guide protruding block.

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

Still further, the automatic injection pen of the above-mentioned, wherein, push rod subassembly 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, and when just injection, sound production subassembly and trigger groove contact.

Still further, the automatic injection pen is further provided with the sliding block assembly, wherein the sliding block assembly comprises a sliding block body, a plurality of reinforcing ribs are distributed on the outer wall of the sliding block body, and a plurality of guide grooves are distributed on the inner wall of the sliding block body.

Still further, the automatic injection pen is further provided with the PFS device, wherein the PFS device comprises a PFS body, an injection end of the PFS body is provided with a needle protection cover, a plunger is arranged in a tail end of the PFS body, and the plunger is a silica gel plug.

Still further, the automatic injection pen is further provided with the sounding assembly, wherein the sounding assembly 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 disposed at a tail section of the inner sleeve body.

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

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

2. The sounding component is configured, so that a relatively obvious 'clamping' prompt tone is generated through collision and friction with the push rod component when the injection is finished, and a user does not need to stare at the injection condition of the traditional Chinese medicine liquid in the observation window, so that the user can know that the injection is finished. At the same time, excessive extrusion of the injection area can be avoided.

3. The silica gel pad is adopted to form the buffer component, so that the PFS device which is installed subsequently can be limited, and smooth work of the PFS device during injection is ensured.

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 present invention, and is intended to provide a better understanding of the present invention, as it is embodied in the following description, 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 housing arrangement.

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

Fig. 4 is a schematic view of the structure of the lower spindle.

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

Fig. 6 is a schematic structural view of the slider assembly.

Fig. 7 is a schematic structural diagram of a sound emitting assembly.

Fig. 8 is a schematic view of the structure of the propulsion device after assembly.

Fig. 9 is a schematic view of the whole sectional structure of the automatic injection pen.

Fig. 10 is a schematic view of the structure of the injection start stage of the automatic injection pen.

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

Fig. 12 is a schematic view of the structure of the automatic injection pen immediately before the injection stage is completed.

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

The meaning of each reference numeral in the figures is as follows.

1. Upper spindle 2 lower spindle

3. Slider assembly 4 push rod assembly

5. Sounding assembly 6 pen cap

7. Shell 8 buffer assembly

9. Inner housing assembly 10 inner housing assembly

11. Needle shield 12 PFS body

13. Plunger 14 observation window

15. Main spring 16 auxiliary spring

17. One-way guide projection 18 locking projection

19. Stop bump 20 clamping groove

21. Trigger slot of reserve slot 22

23. Guide groove for reinforcing rib 24

25. Guide groove of locking block 26

27. Limiting protrusion of energy storage block 28

Detailed Description

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

An automatic injection pen as in fig. 1 to 13 comprises an injection pen body, the injection front end of which is movably provided with a pen cap 6, which is distinguished in that the injection pen body comprises a housing 7, and an observation window 14 is provided on the housing 7. Meanwhile, an inner housing means 9 is provided in the outer housing 7. Specifically, the inner housing means 9 comprises an inner housing body, the front end of which is provided with an inner housing assembly 10. To facilitate administration by injection, a PFS device is disposed within the inner housing assembly 10. And, the rear end of the inner housing means 9 is provided with a pushing means with disabling function, taking into account the need for injection pushing. In order to facilitate giving the user the necessary prompt for the completion of the injection, the propulsion device is provided with a sound emitting assembly 5. Depending on the presence of the sounding component 5, the user can be given an appropriate audible cue after the injection is completed. In view of the fact that the liquid medicine is smoothly fed in the using period, the propelling 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 in 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, a sliding block component 3 is sleeved on the lower main shaft 2, a secondary spring 16 is arranged between the lower main shaft 2 and the sliding block component 3, and a sounding component 5 is arranged at the front end of the lower main shaft 2. The secondary springs 16 function in two ways. Firstly, an actuating force is provided, so that a user needs to provide a certain force before injection, and the possibility of false triggering is reduced. Second, the slider assembly 3 is pushed out with the inner housing means 9 after injection so that the needles carried on the PFS body 12 are not exposed to the inner housing means 9. In actual use, the disabling function is triggered only after the slider assembly 3 is pushed past the unidirectional guide tab 17 of the lower spindle 2.

In combination with a preferred embodiment of the present invention, in order to achieve better storage of the PFS device after installation in place, and to ensure stable combination of the PFS assembly and the inner sleeve assembly 10, no unnecessary shaking due to tolerance occurs, and the end of the inner sleeve assembly 10 is provided with the buffer assembly 8. By means of the buffer component 8, buffer protection of the PFS component can be effectively achieved, proper fixing effect can be achieved, and gaps caused by assembly tolerance are eliminated. Meanwhile, in order to realize effective contact limit and not to influence the necessary relative movement of each component in the subsequent use, the buffer component 8 adopted by the invention is a silica gel pad. In order to realize necessary movement guiding and controlling, a guiding groove 26 is formed on the inner shell body, and a locking block 25 is arranged on the inner sleeve assembly 10. Thus, after the injection is completed, the inner housing assembly 10 can be restrained from moving outwardly by the presence of the locking blocks 25. And, the outside of inner shell subassembly still is provided with spacing protruding 28, can be in the original state of non-injection, restriction inner shell device 9 backward movement, avoid appearing unnecessary rocking.

Further, in order to smoothly guide the plunger 13 inside the PFS device to advance and match with the subsequent sounding assembly 5, the lower spindle 2 adopted in the invention comprises a lower spindle cavity, front guide flaps are distributed in pairs at the front end of the lower spindle cavity, and stop protruding points 19 are arranged on the front guide flaps. Meanwhile, a locking lug 18 is arranged at the middle part of the lower shaft cavity, a one-way guiding lug 17 is arranged at the rear end of the lower shaft cavity, and an axial guiding slope is arranged on the one-way guiding lug 17.

In view of 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 reserved groove 21 is formed in the front end of the push rod body. In this way, in the unused state, the energy storage block 27 of the sound emitting assembly is in a natural state rather than a bent state before sound emission, preventing functional failure in long-term storage. The middle section of push rod body is provided with draw-in groove 20, and the tail end of push rod body is provided with trigger groove 22. In the non-injection stage, the clamping groove 20 is combined with the locking lug 18 arranged at the middle part of the lower shaft cavity. At the end of the injection, the sounding assembly 5 is in contact with the trigger slot 22.

Meanwhile, the sliding block assembly 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 the radial deflection 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 unidirectional guide lug 17 and the push rod, so that the sliding block 3 is prevented from moving leftwards before injection, and the limit function is realized after injection, so that 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 sounding component 5 comprises a sounding block, and an energy storage block 27 is arranged in the sounding block. Meanwhile, the inner sleeve assembly 10 comprises an inner sleeve body, and a locking lug 18 is arranged at the tail section of the inner sleeve body outwards.

The working principle of the invention is as follows:

Step one, a starting stage.

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

And step two, a puncture 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 starts to penetrate into the skin and the inner housing means 9 pushes the slider assembly 3 further upwards until the inner housing means 9 is moved to the extreme position. At this time, a predetermined subcutaneous penetration depth is reached and penetration is completed. The extreme position during the implementation of the invention mainly means 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 lock projection 18 and the catch groove 20, which were originally in the locked state, are mutually released due to the loss of the stopper function of the slider assembly 3. Subsequently, the locking projection 18 is elastically deformed outwardly by the thrust of the main spring 15 sliding along the axial slope until the catch groove 20 of the push rod assembly 4 is completely separated from the catch position of the locking projection 18, whereby the main spring 15 pushes the push rod assembly 4 forward.

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

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

And step three, injection stage.

As shown in fig. 12, the PFS body 12 and the inner housing assembly 10 are snap-fit. At this time, the push rod assembly 4 and the plunger 13 are continuously pushed by the urging force of the main spring 15, and the medicine in the PFS body 12 is injected subcutaneously into the patient until the plunger 13 reaches the bottommost end of the PFS body 12, and the injection is ended.

At the end of injection, the energy storage block of the sounding component 5 can enter the trigger groove 22 of the push rod component 4, and the sounding component 5 collides with the push rod component 4 to give out an end-of-injection 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 procedure. In addition, unnecessary squeezing and damage to the injection area due to excessive pressing of the automatic injector because the user does not know whether the injection has been completed can be avoided. Meanwhile, waiting confirmation is not needed after the injection is finished, and a clear prompt can be given.

And step four, resetting.

As shown in fig. 13, the automatic injector is removed from the injection area. At this time, the sub-spring 16 pushes the slider assembly 3 and the inner case means 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 unidirectional guide projection 17 is elastically deformed inward, and then is released from the slider assembly 3 and the deformation is recovered. At this time, the injection procedure ends with the upper end of the guide groove of the inner housing means 9 abutting against the lock block 25 of the inner housing assembly. In the present state, the unidirectional guide projection 17 has been disengaged from the slider assembly 3 and is enclosed within the housing 7. Since the one-way guide tab 17 cannot be reversed to re-enter the slider assembly 3, if the injector repeats step one, the entire injection process will be blocked, avoiding reuse of the automatic injector.

As can be seen from the above text expressions and the accompanying drawings, the invention has the following advantages:

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

3. The silica gel pad is adopted to form the buffer component, so that the PFS component and the inner sleeve component can be combined, the PFS device which is installed subsequently can be limited, and the smooth work of the PFS device during injection is ensured.

Furthermore, the description of the present invention as to the orientation or positional relationship is based on the orientation or positional relationship shown in the drawings is for convenience of description and simplification of the description only, and is not intended to indicate or imply that the apparatus or configuration referred to 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 defining a "primary" or "secondary" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a number" is two or more, unless explicitly defined otherwise.

Also, the terms "first," "second," and the like 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 defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present invention, unless explicitly stated or limited otherwise, the terms "connected," "configured," and the like should be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed, mechanically connected, electrically connected, directly connected, indirectly connected via an intermediate medium, or in communication with each other or in an interaction relationship between two components. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances. And it may be directly on another 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 is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate describing the invention and simplify the description, and do not indicate or imply that the devices or components referred to must have a particular orientation, be configured and operated in a particular orientation, and thus should not be construed as limiting the invention.

The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, and it should be noted that it is possible for those skilled in the art to make several improvements and modifications without departing from the technical principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. The automatic injection pen comprises an injection pen body, wherein a pen cap 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 an outer shell, an observation window is arranged on the outer shell, an inner shell device is arranged in the outer shell, a propelling device is arranged at the rear end of the inner shell device, a sounding component is arranged on the propelling device, the inner shell device comprises an inner shell body, an inner sleeve component is arranged at the front end of the inner shell body, a PFS device is arranged in the inner sleeve component, the propelling device comprises an upper main shaft, a lower main shaft is sleeved on the upper main shaft, a push rod component is arranged in the lower main shaft, a main spring is arranged between the push rod component and the upper main shaft, a sliding block component is sleeved on the lower main shaft, an auxiliary spring is arranged between the lower main shaft and the sliding block component, and the sounding component is arranged at the front end of the lower main shaft;

The auxiliary spring has the functions of firstly providing an actuating force to ensure that a user needs to provide force before injection and reducing the possibility of false triggering;

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 also provided with a limiting bulge;

the lower spindle comprises a lower spindle cavity, the front ends of the lower spindle cavities are distributed with guide front petals in pairs, the guide front petals are provided with stop protruding points, the middle part of the lower spindle cavity is provided with locking protruding blocks, the rear ends of the lower spindle cavities are provided with unidirectional guide protruding blocks, and the unidirectional guide protruding blocks are provided with axial guide sloping surfaces;

The upper spindle comprises a spindle base, an upper shaft rod is arranged on the spindle base, and a main spring is sleeved on the upper shaft rod; the push rod assembly comprises a push rod body, a reserved groove is formed in the front end of the push rod body, a clamping groove is formed in the middle section of the push rod body, a trigger groove is formed in the tail end of the push rod body, and the sounding assembly is in contact with the trigger groove when injection is finished;

the sliding block assembly comprises a sliding block body, wherein a plurality of reinforcing ribs are distributed on the outer wall of the sliding block body, and a plurality of guide grooves are distributed on the inner wall of the sliding block body;

the guide groove limits the radial deflection of the locking convex block, the tail end of the guide groove does not penetrate through to form a step, the guide groove is matched with the unidirectional guide convex block and the push rod, the sliding block is prevented from moving leftwards before injection, the limiting effect is achieved after injection, and the guide convex block is prevented from reentering the sliding block;

The PFS device comprises a PFS body, wherein an injection end of the PFS body is provided with a needle protection cover, a plunger is arranged in the tail end of the PFS body, and the plunger is a silica gel plug;

The inner sleeve assembly comprises an inner sleeve body, and a locking lug is arranged at the tail section of the inner sleeve body outwards.