Disposable injection pen and injection prompt structure thereof

Abstract

The present invention provides a disposable injection pen and an injection prompt structure thereof. The injection pen realizes an injection function by driving a prefilled syringe in a lower pen shell assembly by an upper pen shell assembly. A rotating sleeve and a screw that rotate in coordination are arranged in the upper pen shell assembly. The injection function of the syringe is completed by the axial advancement of the screw. A synchronously rotating sounding piece is arranged on the rotating sleeve. At the end of the injection work, the sounding piece slides axially relative to the rotating sleeve and collides with the rotating sleeve during the sliding process to emit a prompt sound, indicating that the injection is completed. By arranging a sounding piece with relative axial displacement on the rotating sleeve, a prompt sound indicating that the injection is completed can be accurately prompted, thereby improving the user experience.

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 prompt 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] In existing technologies, disposable injection pens cannot be used with high-viscosity liquid medicines, which affects their versatility. Furthermore, the sound indicating the injection is complete is not clear, which affects the user experience. Summary of the Invention

[0005] In view of this, the present invention provides an injection prompt structure for a disposable injection pen to improve the user experience; the present application 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 prompt structure comprises an upper pen housing assembly and a lower pen housing assembly which are assembled together. A rotating sleeve for driving a screw to perform an injection action is provided in the upper pen housing assembly.

[0008] The upper pen housing assembly is further provided with a sounding member that rotates synchronously with the rotating sleeve;

[0009] At the end of the injection operation, the sounding member slides axially and rotates to collide with the rotating sleeve to emit an injection completion prompt sound.

[0010] Preferably, in the above-mentioned disposable injection pen injection prompt structure, a synchronously rotating drive cover is arranged at the protruding end of the screw of the rotating sleeve, an annular inner cavity is formed between the rotating sleeve and the drive cover, and the sounding member is arranged in the annular inner cavity.

[0011] Preferably, in the above-mentioned injection prompt structure of the disposable injection pen, the screw can be arranged in the rotating sleeve in a spirally advancing manner, and the tail of the screw is provided with a driving structure for driving the sounding member to rotate synchronously.

[0012] Preferably, in the above-mentioned disposable injection pen injection prompt structure, a torsion and compression spring is arranged in the drive cover to provide rotational torsion and axial pressure to the sounding member;

[0013] The end of the screw rod is provided with a driving inner cylinder, the first end of the torsion and compression spring is connected to the driving cover, and the second end of the torsion and compression spring is connected to the sounding member;

[0014] The torsion compression spring presses the sounding member tightly into the driving inner tube.

[0015] Preferably, in the above-mentioned injection prompt structure of the disposable injection pen, the annular inner cavity is arranged between the annular inner ring and the annular outer ring of the drive cover, and the torsion spring is sleeved on the annular inner ring;

[0016] The annular inner ring and the driving inner cylinder are provided with an axial sliding gap, and the inner ring of the sounding member is provided with an inner protrusion of the sounding member extending into the sliding gap.

[0017] Preferably, in the above-mentioned disposable injection pen injection prompt structure, the tail of the screw is provided with an axially arranged long strip protrusion, and the axial end of the long strip protrusion is abutted against the protrusion inside the sound piece, so that the sound piece slides axially.

[0018] Preferably, in the above-mentioned injection prompt structure of the disposable injection pen, the inner wall surface of the driving inner cylinder is provided with an axially arranged guide protrusion, and the outer wall surface of the sounding part is provided with a sliding groove that slides with the guide protrusion.

[0019] Preferably, in the above-mentioned injection prompt structure of the disposable injection pen, the guide protrusions and the sliding grooves include two groups respectively arranged at two radial ends of the driving inner cylinder.

[0020] Preferably, in the above-mentioned injection prompt structure of the disposable injection pen, a head protrusion is provided on the head of the sounding member, and a drive cover protrusion is provided on the inner ring of the drive cover, and the head protrusion and the drive cover protrusion collide and fit at the same radial position.

[0021] A disposable injection pen comprises an upper pen housing assembly and a lower pen housing assembly, wherein a fixed sleeve and a rotating sleeve are provided in the upper pen housing assembly, and a first torsion spring is provided on the outer ring of the rotating sleeve for driving the rotation thereof, characterized in that the rotating sleeve has the injection structure of the disposable injection pen as described in any of the above items.

[0022] The present invention provides a disposable injection pen injection prompt structure, comprising an assembled upper and lower pen housing assemblies. A rotating sleeve is disposed within the upper pen housing assembly, driving a screw to perform an injection operation. A sounding member is also disposed within the upper pen housing assembly, rotating synchronously with the rotating sleeve. At the end of the injection operation, the sounding member slides axially and then rotatably impacts the rotating sleeve, producing an injection completion prompt sound. The injection pen achieves its injection function by driving a prefilled syringe within the lower pen housing assembly. The upper pen housing assembly includes a rotating sleeve and a screw, which rotate in tandem. The axial advancement of the screw completes the injection of the syringe. A synchronously rotating sounding member is disposed on the rotating sleeve. At the end of the injection operation, the sounding member slides axially relative to the rotating sleeve, colliding with the rotating sleeve during the sliding process, producing a prompt sound indicating the completion of the injection. By providing the sounding member with relative axial displacement on the rotating sleeve, the injection completion prompt sound can be accurately provided, improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] 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.

[0024] Figure 1 An exploded diagram of the structure of the disposable injection pen provided in this application;

[0025] Figure 2 Schematic diagram of the screw drive structure in the upper pen housing assembly;

[0026] Figure 3 A schematic diagram of the sound generating structure provided in this application;

[0027] Figure 4 for Figure 3 Schematic diagram of the rotating sleeve structure;

[0028] Figure 5 for Figure 3 Schematic diagram of the middle sounding member in the first direction;

[0029] Figure 6 for Figure 3 Schematic diagram of the second direction of the middle sound component. DETAILED DESCRIPTION

[0030] The present invention discloses an injection prompt structure of a disposable injection pen, which improves the user experience; the application 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 axial edge of the needle guard cap 601, so that the needle guard cap 601 is subjected to the 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] like Figure 2 As shown, Figure 2 Schematic diagram of the screw drive structure in the upper pen housing assembly.

[0037] The drive cap 015 is part of the injection mechanism within the upper housing. A rotating sleeve 012 is mounted within the fixed sleeve 007. Inside this sleeve is a screw 017 that drives the prefilled syringe 006 for injection. Rotating sleeve 012 is connected to the drive cap 015, which houses the sounding element 013.

[0038] In a specific embodiment of the present case, a synchronously rotating drive cover 015 is arranged at the protruding end of the screw 017 of the rotating sleeve 012, and an annular inner cavity is formed between the rotating sleeve 012 and the drive cover 015, and the sounding member 013 is arranged in the annular inner cavity.

[0039] The screw 017 can be spirally advanced and arranged in the rotating sleeve 012, and the tail of the screw 017 is provided with a driving structure for driving the sounding member 013 to rotate synchronously.

[0040] Furthermore, a torsion and compression spring 014 is arranged inside the driving cover 015 to provide rotational torsion and axial pressure to the sounding member 013; a driving inner cylinder 1201 is provided at the end of the screw 017, a first end of the torsion and compression spring 014 is connected to the driving cover 015, and a second end of the torsion and compression spring 014 is connected to the sounding member 013; the torsion and compression spring 014 presses the sounding member 013 tightly into the driving inner cylinder 1201.

[0041] 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 to initiate injection.

[0042] 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.

[0043] 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.

[0044] like Figure 3-Figure 6 As shown, Figure 3 A schematic diagram of the sound generating structure provided in this application; Figure 4 for Figure 3 Schematic diagram of the rotating sleeve structure; Figure 5 for Figure 3 Schematic diagram of the middle sounding member in the first direction; Figure 6 for Figure 3 Schematic diagram of the second direction of the middle sound component.

[0045] In a specific embodiment of the present case, the annular inner cavity is arranged between the annular inner ring 1502 and the annular outer ring 1503 of the driving cover 015, and the torsion spring is sleeved on the annular inner ring 1502;

[0046] The annular inner ring 1502 and the driving inner cylinder 1201 are provided with an axial sliding gap, and the inner ring of the sounding member 013 is provided with an inner protrusion 1312 of the sounding member extending into the sliding gap.

[0047] The tail of the screw 017 is provided with an axially arranged long strip protrusion 1701, and the axial end of the long strip protrusion 1701 is matched with the protrusion 1312 inside the sound member, so that the sound member slides axially.

[0048] Furthermore, a guide protrusion 1211 arranged along the axial direction extends from the inner wall surface of the driving inner cylinder 1201, and a sliding groove 1311 that slides and cooperates with the guide protrusion 1211 is provided on the outer wall surface of the sound member 013.

[0049] The guide protrusions 1211 and the sliding grooves 1311 include two groups respectively arranged at the radial ends of the driving inner cylinder 1201.

[0050] In a specific structure of this case, a head protrusion 1313 is provided on the head of the sounding member 013, and a driving cover protrusion 1501 is provided on the inner ring of the driving cover 015. The head protrusion 1313 and the driving cover protrusion 1501 collide and fit at the same radial position.

[0051] In this embodiment, the inner wall of the driving inner cylinder 1201 is provided with axially arranged guide protrusions 1211. The outer wall of the sounding member 013 is provided with sliding grooves 1311 that slidably engage with the guide protrusions 1211. The guide protrusions 1211 and sliding grooves 1311 comprise two sets, one at each radial end of the driving inner cylinder 1201. When the sounding member 013 is installed in the driving inner cylinder, it is axially compressed by the torsion compression spring 014, positioning the sounding member 013 within the driving inner cylinder 1201.

[0052] The head of the sounding member 013 is provided with a head protrusion 1313, and the inner ring of the driving cover 015 is provided with a driving cover protrusion 1501. The head protrusion 1313 and the driving cover protrusion 1501 are located at the same radial position. Furthermore, the annular inner ring 1502 extending from the base of the driving cover 015 serves as a driving cover guide cylinder, and the driving cover protrusion 1501 is arranged on the outer circumference of the annular inner ring 1502 of the driving cover 015. The sounding member 013 has a sounding member rotating cylinder 1314 that fits snugly with the annular inner ring 1502 of the driving cover 015. The head protrusion 1313 is arranged at the head of the sounding member rotating cylinder 1314.

[0053] Similarly, a long strip convex point 1701 is provided at the tail of the screw 017, and an inner convex point 1312 of the sound piece is provided on the inner wall surface of the sound piece 013. In this embodiment, the long strip convex point 1701 and the inner convex point 1312 of the sound piece are arranged relative to each other in the extension direction of the screw 017. When the screw 017 is fed to the tail of the screw, the long strip convex point 1701 and the inner convex point 1312 of the sound piece are matched, so that the sound piece 013 slides axially until The sliding groove 1311 of the sound piece 013 is detached from the guide protrusion 1211. The bottom surface of the sound piece 013 is a flat structure. The sound piece 013 is rotatably supported by the top of the guide protrusion 1211. Under the action of the torsion spring 014, the torsional force stored in the torsion spring 014 drives the sound piece 013 to rotate rapidly, and causes the head protrusion 1313 to hit the drive cover protrusion 1501 during the rotation process, making a sound as a prompt sound of the injection structure.

[0054] 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 prompt structure, characterized in that: It includes an upper pen housing assembly and a lower pen housing assembly that are assembled together. A rotating sleeve for driving a screw to perform an injection action is provided in the upper pen housing assembly. The upper pen housing assembly is further provided with a sounding member that rotates synchronously with the rotating sleeve; At the end of the injection operation, the sounding member slides axially and rotates to collide with the rotating sleeve to emit an injection completion prompt sound; A drive cover that rotates synchronously is arranged at the protruding end of the screw of the rotating sleeve, an annular inner cavity is formed between the rotating sleeve and the drive cover, the sounding member is arranged in the annular inner cavity, and a sounding member inner convex point is provided on the inner wall surface of the sounding member; A torsion and compression spring is arranged inside the driving cover to provide rotational torsion and axial pressure to the sounding member; The end of the screw is provided with a driving inner cylinder, the annular inner cavity is arranged between the annular inner ring and the annular outer ring of the driving cover, and the torsion spring is sleeved on the annular inner ring; An axial sliding gap is provided between the annular inner ring and the driving inner cylinder, and an inner protrusion of the sounding member is provided on the inner ring of the sounding member and extends into the sliding gap; The tail of the screw is provided with an axially arranged long strip convex point, and the axial end of the long strip convex point is matched with the convex point inside the sound member, so that the sound member slides along the axial direction; A head protrusion is provided on the head of the sounding part, and a drive cover protrusion is provided on the inner ring of the drive cover. The head protrusion and the drive cover protrusion collide and fit at the same radial position.

2. The injection prompt structure of a disposable injection pen according to claim 1, characterized in that: The screw rod can be arranged in the rotating sleeve in a spiral manner, and the tail of the screw rod is provided with a driving structure for driving the sounding member to rotate synchronously.

3. The injection prompt structure of the disposable injection pen according to claim 2, characterized in that: The first end of the torsion and compression spring is connected to the driving cover, and the second end of the torsion and compression spring is connected to the sounding member; The torsion compression spring presses the sounding member tightly into the driving inner tube.

4. The injection prompt structure of the disposable injection pen according to claim 3, characterized in that: The inner wall surface of the driving inner cylinder is provided with a guide protrusion arranged along the axial direction, and the outer wall surface of the sounding part is provided with a sliding groove that slides with the guide protrusion.

5. The injection prompt structure of the disposable injection pen according to claim 4, characterized in that: The guide protrusions and the sliding grooves include two groups respectively arranged at two radial ends of the driving inner cylinder.

6. A disposable injection pen, comprising an upper pen housing assembly and a lower pen housing assembly, wherein a fixed sleeve and a rotating sleeve are provided in the upper pen housing assembly, and a first torsion spring is provided on the outer ring of the rotating sleeve to drive the rotating sleeve to rotate, characterized in that: The rotating sleeve has the injection prompt structure of the disposable injection pen according to any one of claims 1 to 5.

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