Disposable injection pen and injection unlocking structure thereof

Abstract

The present invention provides a disposable injection pen and an injection unlocking structure thereof. A prefilled syringe is assembled in a lower pen housing assembly, which is driven by a driving device in an upper pen housing assembly for injection. During the injection process, the lower pen housing assembly drives a rotating slider in the upper pen housing assembly to move upward to expose the injection needle. The rotating slider slides on a fixed sleeve. During the sliding process, the driving device in the upper pen housing assembly is unlocked. The rotating slider is rotatably arranged and slides axially before reaching the unlocking position. After reaching the unlocking position, the rotating slider rotates and collides with the fixed sleeve to produce an unlocking prompt sound, thereby allowing the user to accurately know the injection start status and accurately perform subsequent injection actions.

Description

Technical Field

[0001] The present invention relates to the technical field of injection pens, and more particularly to a disposable injection pen and an injection unlocking structure thereof. Background Art

[0002] A disposable injection pen is a pen-shaped syringe that comes pre-filled with medication, also known as a prefilled injection pen. In an existing disposable autoinjector pen structure, the disposable autoinjector pen contains an injector assembly consisting of a pre-filled syringe, pre-filled liquid, and a rubber stopper.

[0003] To use, first remove the pen cap, which removes the needle guard from the prefilled syringe. Then, press the protective case to initiate a subcutaneous injection. The injection is powered by a compression spring, and the injection process is visible. A window is located near the needle tip in the protective case, and a tone indicates completion when the injection is about to be completed, alerting the user. Stop pressing the protective case, and the spring's reaction force returns the case to its pre-use position, locking it in place. Pressing the protective case again prevents the needle tip from being exposed, preventing the needle from extending after use and preventing injuries.

[0004] Existing disposable injection pens are equipped with a protection lock to prevent misuse. Since there is no prompt function when the protection lock is activated, the user cannot determine whether the protection function has been activated without pressing the pen. Summary of the Invention

[0005] In view of this, the present invention provides an injection unlocking structure for a disposable injection pen to accurately obtain the unlocking status of a disposable injection; the present invention also provides a disposable injection pen.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A disposable injection pen injection unlocking structure comprises an upper pen housing assembly and a lower pen housing assembly that are assembled together. A fixed sleeve is provided in the upper pen housing assembly, and a rotating slider that is arranged to slide along the axial direction is provided on the fixed sleeve.

[0008] The fixed sleeve guides the axial sliding of the rotary slider, and when the rotary slider slides axially to the unlocking position, drives the rotary slider to rotate so as to collide with the fixed sleeve to emit an unlocking prompt sound.

[0009] Preferably, in the above-mentioned injection unlocking structure of the disposable injection pen, a fixing sleeve groove is provided on the outer wall surface of the fixing sleeve, and a rotating slider protrusion extends from the inner wall surface of the rotating slider;

[0010] The fixed sleeve groove includes a fixed sleeve sliding groove for guiding the axial sliding of the rotary slider protrusion, and an impact step for impact cooperation with the rotary slider.

[0011] Preferably, in the above-mentioned injection unlocking structure of the disposable injection pen, a first torsion and compression spring is sleeved on the fixed sleeve, and the first torsion and compression spring is connected to the rotating slider;

[0012] The first torsion spring provides axial elastic support to the rotary slider and drives the rotary slider to perform circumferential torsion.

[0013] Preferably, in the above-mentioned disposable injection pen injection unlocking structure, the impact step is a first step and a second step arranged in the fixed sleeve groove and arranged along the torsion direction of the first torsion spring, and the first step and the second step are arranged sequentially along the extension direction of the first torsion spring.

[0014] Preferably, in the above-mentioned injection unlocking structure of the disposable injection pen, the impact steps are both located on the first step and the second step and are step side walls opposite to the twisting direction of the protrusion of the rotating slider.

[0015] Preferably, in the above-mentioned injection unlocking structure of the disposable injection pen, the fixed sleeve slide groove has a first fixed sleeve notch connected to the first step; and there is a second fixed sleeve notch between the first step and the second step to guide the first torsion spring to rotate from the first step into the second step.

[0016] Preferably, in the above-mentioned injection unlocking structure of the disposable injection pen, the rotary slider is a cylindrical rotary slider, and the rotary slider is sleeved on the fixed sleeve.

[0017] Preferably, in the above-mentioned injection unlocking structure of the disposable injection pen, it further includes a sleeve on the fixed sleeve, which drives the rotating slider to slide axially.

[0018] A disposable injection pen comprises an upper pen housing assembly and a lower pen housing assembly. A fixed sleeve is provided in the upper pen housing assembly, and a fixed slider for unlocking a screw is mounted on the fixed sleeve. The injection unlocking structure of the disposable injection pen as described in any of the above items is provided between the fixed sleeve and the fixed slider.

[0019] Preferably, in the above-mentioned disposable injection pen, a protective shell is provided on the lower pen housing assembly to protect the prefilled syringe, and protective fins extend from the protective shell to abut against the fixed slider and push the fixed slider to move.

[0020] The present invention provides a disposable injection pen injection unlocking structure comprising an upper and lower pen housing assembly that are assembled and matched. The upper pen housing assembly is provided with a fixed sleeve, on which a rotary slider is arranged to slide axially. The fixed sleeve guides the axial sliding of the rotary slider and, when the rotary slider slides axially to the unlocked position, drives the rotary slider to rotate, thereby colliding with the fixed sleeve and emitting an unlocking prompt sound. The lower pen housing assembly is assembled with a prefilled syringe, which is driven by a drive device in the upper pen housing assembly to perform injection. During the injection process, the lower pen housing assembly drives the rotary slider in the upper pen housing assembly to move upward to expose the injection needle. The rotary slider slides on the fixed sleeve, unlocking the drive device in the upper pen housing assembly during the sliding process. The rotary slider is rotatably arranged to slide axially before reaching the unlocked position. After reaching the unlocked position, the rotary slider rotates and collides with the fixed sleeve to produce an unlocking prompt sound, thereby accurately notifying the user of the injection initiation status and allowing them to accurately perform subsequent injection actions. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 An exploded diagram of the structure of the disposable injection pen provided in this application;

[0023] Figure 2 This is a cross-sectional view of the internal structure of the upper pen housing assembly;

[0024] Figure 3 Schematic diagram of the internal structure of the upper pen housing assembly;

[0025] Figure 4 A cross-sectional view of the directional slider structure of the upper pen housing assembly;

[0026] Figure 5 Schematic diagram of the fixed sleeve structure in the upper pen housing assembly;

[0027] Figure 6 Schematic diagram of the rotary slider structure of the upper pen housing assembly;

[0028] Figure 7 Schematic diagram of the screw drive structure in the upper pen housing assembly;

[0029] Figure 8 Schematic diagram of the structure of the drive cover. DETAILED DESCRIPTION

[0030] The present invention discloses an injection unlocking structure for a disposable injection pen, which can accurately obtain the unlocking status of a disposable injection; the present invention also provides a disposable injection pen.

[0031] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0032] like Figure 1 As shown, Figure 1 This is an exploded diagram of the structure of the disposable injection pen provided in this application.

[0033] The present application provides a disposable injection pen, comprising an upper pen shell assembly and a lower pen shell assembly that are assembled together. The lower pen shell assembly includes a pen cap 001, a protective shell 003 that is clamped in the pen cap 001, and an inner ring of the protective shell 003 is arranged with a bracket 005 that supports a prefilled syringe 006; a pen cap spring 002 is provided on the pen cap 001 and extends toward the bracket 005, and the pen cap spring 002 is pressed tightly against the axial edge of the needle guard 601. The lower pen shell assembly is supported by the protective shell 003 installed in the pen cap 001 to lift the bracket 005. The prefilled syringe 006 can be fixed in the bracket 005. A pen cap spring 002 is set in the pen cap 001, and the axial edge of the needle guard cap 601 is pressed and fitted by the pen cap spring 002. By setting a pen cap with a spring structure, the spring is used to press the circumferential edge of the needle guard cap 601, so that the needle guard cap is subjected to an axial pulling-out force, and the clamping structure is stable, ensuring that the needle guard cap can be pulled out smoothly.

[0034] The disposable injection pen provided in the present application includes an upper pen housing assembly and a lower pen housing assembly that are assembled together. The lower pen housing assembly is used to arrange a prefilled syringe 006, and the upper pen housing assembly is used to arrange a driving device that drives the prefilled syringe 006 to perform injection.

[0035] The lower pen housing assembly includes a pen cap 001 and a protective housing 003 that snaps onto the inner ring of pen cap 001. The outer ring of protective housing 003 further houses a lower pen housing 004, the first end of which is also mounted within pen cap 001. A bracket 005 is further positioned within the inner ring of protective housing 003, securing the bracket 005 to the protective housing 003. A prefilled syringe 006 is mounted within bracket 005, with its needle guard 601 inserted into pen cap 001. A cap spring 002, mounted on pen cap 001, presses against the axial edge of needle guard 601, ensuring simultaneous removal of needle guard 601 during removal of pen cap 001.

[0036] The upper pen housing assembly is a driving part that pushes the prefilled syringe 006 to perform an injection action, and includes an upper pen housing 016 and a driving structure arranged in the upper pen housing 016. The upper pen housing 016 and the lower pen housing 004 are plug-fitted.

[0037] like Figure 2-Figure 6 As shown, Figure 2 This is a cross-sectional view of the internal structure of the upper pen housing assembly; Figure 3 Schematic diagram of the internal structure of the upper pen housing assembly; Figure 4 A cross-sectional view of the directional slider structure of the upper pen housing assembly; Figure 5 Schematic diagram of the fixed sleeve structure in the upper pen housing assembly; Figure 6 This is a schematic diagram of the rotating slider structure of the upper pen housing assembly.

[0038] Arranged in the upper pen housing 016 are a directional slider 010 that is sequentially pushed by the protective housing, a rotating slider 009 arranged at the axial end of the directional slider 010 , and a fixed sleeve 007 that guides and supports the axial sliding of the directional slider 010 and the rotating slider 009 .

[0039] Both the directional slider 010 and the rotating slider 009 have a cylindrical structure. The directional slider 010 includes a driving fin 1001 that abuts against the two protective fins 302 of the protective shell 003, and a slider sleeve 1002 that fits around the outer periphery of the fixed sleeve. The rotating slider 009 also has a cylindrical structure and is rotatably arranged at the axial end of the slider sleeve 1002.

[0040] A fixed sleeve groove 701 is provided on the outer wall surface of the fixed sleeve 007, and a rotating slider protrusion 901 that slides in the fixed sleeve groove 701 extends from the inner wall surface of the rotating slider 009. The fixed sleeve groove 701 has a predetermined guide length, which is determined by the length of the injection needle of the prefilled syringe 006 exposed when the protective shell 003 slides axially.

[0041] A first torsion spring 008 is mounted on the fixed sleeve 007, which is connected to the rotating slider 009. A fixed sleeve groove is provided on the outer wall of the fixed sleeve 007. The fixed sleeve groove includes a fixed sleeve chute 701 and an impact step arranged on one circumferential side of the fixed sleeve chute 701. Specifically, the fixed sleeve groove includes a first recessed portion and a second recessed portion, which are connected. The first recess forms the fixed sleeve chute 701; the second recess includes a first step 702 and a second step 703, which are connected to the fixed sleeve chute 701 and arranged along the torsion direction of the first torsion spring 008. The first step 702 and the second step 703 are arranged sequentially along the extension direction of the first torsion spring 008. The fixed sleeve groove 701 has a first fixed sleeve notch 704 connected to the first step 702; there is a second fixed sleeve notch 705 between the first step 702 and the second step 703 to guide the first torsion spring 008 to rotate from the first step 702 to the second step 703. The first fixed sleeve notch 704 is a horizontal notch arranged along the circumferential direction, and the second fixed sleeve notch 705 is a vertical notch arranged along the axial direction. The fixed sleeve groove 701 is divided into two parts, a sliding part and an impact part, by the middle vertical plate 706.

[0042] When the injection is initiated, the protective shell 003 slides axially to expose the injection needle. The axial movement of the protective shell 003 pushes the directional slider 010 to slide. The directional slider 010 is provided with an inner slider protrusion 1004. The inner slider protrusion 1004 slides within the fixed sleeve slot 701. During the sliding process, the directional slider 010 pushes the rotating slider 009 to translate axially. The rotating slider protrusion 901 inside the rotating slider 009 also slides with the fixed sleeve slot 701, causing the rotating slider 009 to move axially along the fixed sleeve slot 701. A first torsion spring 008 is arranged between the rotating slider 009 and the fixed sleeve 007. The sliding of the rotating slider 009 compresses the first torsion spring 008, causing the rotating slider 009 to have a tendency to rotate. However, the fixed sleeve slot 701 blocks the rotating slider 009, causing it to slide axially within the fixed sleeve slot 701, providing only axial pressure on the first torsion spring 008.

[0043] like Figure 7 and Figure 8 As shown, Figure 7 Schematic diagram of the screw drive structure in the upper pen housing assembly; Figure 8 Schematic diagram of the structure of the drive cover.

[0044] When the directional slider 010 moves a certain distance, the long strip protrusion 1003 set on the inner side of the directional slider 010 contacts the driving cover 015 in the driving structure of the upper pen shell 016, and the driving cover outer protrusion 1501 is set on the outer side of the driving cover 015. The injection action of the prefilled syringe is restricted by the abutment between the long strip protrusion 1003 and the driving cover outer protrusion 1501.

[0045] During the axial movement of the directional slider 010 pushed by the protective shell 003, the outer protrusion 1501 of the driving cover 015 and the long strip protrusion 1003 are gradually separated. After the directional slider 010 slides a predetermined distance, it reaches the injection position. At this time, the long strip protrusion 1003 and the driving outer protrusion 1501 need to be separated, that is, the directional slider 010 slides axially to the unlocking position and enters the injection position.

[0046] By setting a rotating slider 009 at the axial end of the directional slider 010, after the directional slider 010 slides to the injection position, the rotating slider 009 is set to move to the first fixed sleeve notch 704. At this time, the first torsion spring 008 drives the rotating slider 009 to rotate, and the rotating slider protrusion 901 on the inner side of the rotating slider 009 hits the side wall at the first step 702 of the fixed sleeve groove 701 and makes a sound, so that the rotating slider cooperates with the fixed sleeve to produce an injection prompt sound to start the injection.

[0047] After the injection is completed and the injection needle is pulled out, the end of the protective shell 003 loses pressure and produces a return action. Specifically, the torsional pressure stored in the first torsion and compression spring 008 acts as a reaction force. The first torsion and compression spring 008 pushes the rotating slider 009 to produce a return slide in the axial direction, and further pushes the directional slider 010 to slide. The sliding of the directional slider 010 further pushes the protective shell 003 to move axially toward the injection needle.

[0048] During the sliding movement of the rotary slider 009, which is pushed by the first torsion and compression spring 008, the rotary slider protrusion 901 adheres to the side wall at the first step 702 and slides along the first step 702. When the rotary slider protrusion 901 moves to the second fixed sleeve notch 705 at the junction of the first step 702 and the second step 703, the rotary slider 009 rotates toward the second step 703 under the torsional reaction force of the first torsion and compression spring 008. The rotary slider protrusion 901 inside the rotary slider 009 strikes the fixed sleeve side wall at the second step 703. The impact of the rotary slider protrusion 901 and the second step 703 produces a sound, indicating that the protective shell 003 has fully returned to its original position. The impact sound also produces a warning sound of the protective locking function of the prefilled syringe 006. At this time, the protective shell 003 is pressed. Because the first step 702 and the second step 703 block the rotary slider 009 axially, the protective shell 003 will not slide axially, and the injection needle cannot be exposed, effectively preventing the injection needle from being reused. One end of the first torsion and compression spring 008 is connected to the fixed sleeve 007 , and the other end is fixed to the external mounting structure 902 on the outer periphery of the rotating slider 009 , so as to facilitate the installation and positioning of the first torsion and compression spring 008 .

[0049] like Figure 7 In the figure, drive cap 015 is part of the injection mechanism within the upper housing. Rotating sleeve 012 is located within fixed sleeve 007. Rotating sleeve 012 houses screw 017, which drives prefilled syringe 006 for injection. Rotating sleeve 012 is connected to drive cap 015, which houses sounding element 013.

[0050] After the drive cap 015 is unlocked, the first torsion spring 011, which is mounted on the outer ring of the rotating sleeve 012, is unlocked. The first torsion spring 011 is connected between the fixed sleeve 007 and the rotating sleeve 012, and a torque is stored in the first torsion spring 011. After unlocking, the torsion force of the first torsion spring 011 is released, driving the rotating sleeve 012 to rotate. This rotation of the rotating sleeve 012 drives the drive cap 015, which in turn drives the screw 017. The screw 017 passes through the nut 018 and rotates. The screw 017 moves, contacts the gasket 020, passes through the rear cover 019, and further pushes the stopper 021 of the prefilled syringe 006 to initiate injection.

[0051] An annular inner cavity is provided in the driving cover 015, and a driving inner cylinder 1201 is provided on the rotating sleeve 012. The driving inner cylinder 1201 is inserted into the annular inner cavity of the driving cover 015. A plurality of axially extending card grooves and card-fitting ribs are provided on the outer wall surface of the driving inner cylinder 1201 and the inner wall surface of the annular inner cavity, so that the rotation of the rotating sleeve 012 drives the driving cover 015 to rotate synchronously.

[0052] By utilizing the annular inner cavity structure formed between the drive cap 015 and the rotating sleeve 012 and arranging a sounding member 013 within the annular inner cavity, after the injection structure is set, the sounding member 013 is driven to rotate and produce an injection completion sound, indicating that the injection is complete. The injection prompt sound can be implemented by arranging multiple rotating sounding member 013 structures within the annular inner cavity, and the sounding member 013 rotates within the annular inner cavity to produce a sound as the injection completion sound.

[0053] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A disposable injection pen injection unlocking structure, characterized in that: The pen housing assembly comprises an upper pen housing assembly and a lower pen housing assembly which are assembled together. A fixed sleeve is provided in the upper pen housing assembly, and a rotating slider which is arranged to slide along the axial direction is provided on the fixed sleeve. The fixed sleeve guides the axial sliding of the rotary slider, and when the rotary slider slides axially to the unlocking position, drives the rotary slider to rotate so as to collide with the fixed sleeve and emit an unlocking prompt sound; The outer wall surface of the fixed sleeve is provided with a fixed sleeve groove, and the inner wall surface of the rotating slider is provided with a rotating slider protrusion; The fixed sleeve groove includes a fixed sleeve sliding groove for guiding the axial sliding of the protrusion of the rotating slider, and an impact step for impact cooperation with the rotating slider; The fixed sleeve is provided with a first torsion and compression spring, and the first torsion and compression spring is connected to the rotating slider; The first torsion spring provides axial elastic support to the rotary slider and drives the rotary slider to perform circumferential torsion.

2. The injection unlocking structure of a disposable injection pen according to claim 1, characterized in that: The impact step is a first step and a second step arranged in the fixing sleeve groove and along the torsion direction of the first torsion and compression spring. The first step and the second step are arranged sequentially along the extending direction of the first torsion and compression spring.

3. The injection unlocking structure of a disposable injection pen according to claim 2, characterized in that: The impact steps are both located on the first step and the second step and are step side walls opposite to the twisting direction of the protrusion of the rotary slider.

4. The injection unlocking structure of a disposable injection pen according to claim 3, characterized in that: The fixed sleeve slot has a first fixed sleeve notch connected to the first step; and a second fixed sleeve notch is provided between the first step and the second step for guiding the first torsion spring to rotate from the first step into the second step.

5. The injection unlocking structure of a disposable injection pen according to claim 4, characterized in that: The rotary slider is a cylindrical structured rotary slider, and the rotary slider is sleeved on the fixed sleeve.

6. The injection unlocking structure of a disposable injection pen according to claim 5, characterized in that: It also includes a sleeve on the fixed sleeve, driving the rotating slider to slide along the axial direction of the directional sleeve.

7. A disposable injection pen, characterized in that: It includes an upper pen housing assembly and a lower pen housing assembly. A fixed sleeve is provided in the upper pen housing assembly. A fixed slider for unlocking the screw is mounted on the fixed sleeve. The disposable injection pen injection unlocking structure according to any one of claims 1 to 6 is provided between the fixed sleeve and the fixed slider.

8. The disposable injection pen according to claim 7, characterized in that: A protective shell for protecting the prefilled syringe is provided on the lower pen housing assembly, and a protective fin is extended from the protective shell to abut against the fixed slider and push the fixed slider to move.

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