Injection carriage support structure and disposable injection pen

Abstract

This invention provides an injection tray support structure and a disposable injection pen, including an injection tray and a pre-filled syringe arranged within the injection tray. The pre-filled syringe has a flange portion, and the injection tray has a flange support end that supports the flange portion. The flange support end has a flange portion that accommodates the flange portion, and the inner ring of the flange portion forms a groove for accommodating the flange portion. A support structure that provides multi-point support for the flange portion is provided within the groove. A multi-point support system is constructed between the injection back side of the flange portion and the injection tray. Through the multi-point support structure, the support for the flange portion of the pre-filled syringe is transformed from traditional surface contact to local line contact or point contact, thereby reducing the contact stability problem caused by the surface flatness of the injection back side and improving contact safety and reliability.

Description

Technical Field

[0001] This invention relates to the field of injection pen technology, and more specifically, to an injection holder support structure and a disposable injection pen. Background Technology

[0002] A disposable injection pen is a pen-shaped syringe pre-filled with medication, also known as a pre-filled injection pen. In one existing disposable automatic injection pen design, the pen contains a syringe assembly consisting of a pre-filled syringe, pre-filled liquid, and a rubber stopper.

[0003] When using the device, first remove the pen cap, which will bring out the pre-filled syringe needle cap. Then, press the protective shell to administer the subcutaneous injection. The injection is powered by a compression spring, torsion spring, or coil spring. The injection process is visible, as there is a viewing window near the needle on the protective shell. An injection completion beep will sound as the injection is nearing completion to remind the user. Stop pressing the protective shell; it will return to its pre-use position under the reaction force of the compression spring, locking in place. Pressing the protective shell again will prevent the needle tip from protruding, ensuring that the needle of the disposable auto-injector pen cannot extend after use and preventing puncture wounds.

[0004] In existing injection pen structures, the pre-filled syringe is assembled inside a protective shell, and an injection bracket is set inside the protective shell. The injection bracket supports the flange structure of the pre-filled syringe. Due to manufacturing errors, the back side of the flange structure may have surface flatness issues due to processing reasons, resulting in microscopic unevenness or shape and position errors. This causes the pre-filled syringe to tilt during injection, affecting injection stability. Summary of the Invention

[0005] In view of this, the present invention provides an injection tray support structure and a disposable injection pen to ensure the stability of the injection pen during operation.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] An injection tray support structure includes an injection tray and a pre-filled syringe disposed within the injection tray, the pre-filled syringe having a flange portion, and the injection tray having a flange support end for supporting the flange portion.

[0008] The flange support end has a flange portion that accommodates the flange portion, and the inner ring of the flange portion forms a groove that accommodates the flange portion.

[0009] The settling tank is equipped with a support structure that provides multi-point support for the flange.

[0010] Preferably, in the above-mentioned injection bracket support structure, the flange support end has a flange portion for accommodating the flange portion, the flange portion having an annular arm plate structure, and the inner ring of the flange portion forming a groove for accommodating the flange portion.

[0011] Preferably, in the above-mentioned injection bracket support structure, the flange portion has a racetrack-shaped flange feature, and the inner surface of the flange portion is provided with a conforming feature suitable for cooperating with the racetrack-shaped flange feature.

[0012] Preferably, in the above-mentioned injection tray support structure, the inner surface of the flange portion is provided with a recessed feature, which is adapted to provide a deformation space for accommodating the flange portion when the pre-filled syringe is inserted into the injection tray.

[0013] Preferably, in the above-mentioned injection bracket support structure, the straight segment of the flange portion has a first recessed feature that is thinned along the wall thickness direction, and the arc segment of the flange portion has a second recessed feature that is thinned along the wall thickness direction. The first recessed feature and the second recessed feature make the flange portion have a wall plate structure with varying thickness.

[0014] Preferably, in the above-mentioned injection bracket support structure, the flange portion causes the injection bracket to form an annular groove, the bottom surface of the annular groove is recessed inward to form a secondary groove, and a central flange is formed between the secondary groove and the central through hole of the injection bracket.

[0015] The support structure consists of multiple support ribs located between the central flange and the flange portion.

[0016] A disposable injection pen includes a lower pen housing and a pre-filled syringe disposed within the lower pen housing. A refractive bracket is disposed within the lower pen housing, and the injection bracket has an injection bracket support structure as described above for supporting the pre-filled syringe.

[0017] Preferably, in the above-mentioned disposable injection pen, a protective shell is further arranged between the lower pen shell and the injection holder, and the protective shell has a pair of support arms arranged radially opposite each other; the pair of support arms are respectively located on both sides of the injection holder, and the inner side of the support arm is pressed against the straight segment of the flange portion.

[0018] Preferably, in the above-mentioned disposable injection pen, the inner side of the support arm is provided with a rib arranged along its extension direction, and the support arm is pressed against the flange portion by the rib to form a pressing fit.

[0019] Preferably, in the above-mentioned disposable injection pen, two ribs are arranged and symmetrically arranged on both sides of the arm plate structure extending from the support arm in the width direction.

[0020] Preferably, in the above-mentioned disposable injection pen, a fixed beam-type inner arm plate is provided between the flange portion of the injection holder and the end of the injection holder;

[0021] The inner arm plate is provided with guide protrusions, and the support arm of the protective shell is provided with guide grooves arranged along the axial direction. The guide protrusions are guided to slide within the guide grooves.

[0022] The present invention provides an injection tray support structure and a disposable injection pen, comprising an injection tray and a pre-filled syringe arranged within the injection tray. The pre-filled syringe has a flange portion, and the injection tray has a flange support end for supporting the flange portion. The flange support end has a flange portion for accommodating the flange portion, and the inner ring of the flange portion forms a groove for accommodating the flange portion. A support structure for multi-point support of the flange portion is provided in the groove. A multi-point support system is constructed between the injection back side of the flange portion and the injection tray. Through the multi-point support structure, the support of the flange portion of the pre-filled syringe is changed from traditional surface contact to local line contact or point contact, which significantly reduces the processing accuracy requirements for the flatness of the injection back side of the flange portion. When the injection back side of the flange portion has surface flatness problems due to processing reasons, resulting in micro-unevenness or shape and position errors, multiple support ribs can still be used to form a line support or point support structure to ensure stable mechanical transmission, thereby reducing the contact stability problems caused by the surface flatness problems of the injection back side, and improving contact safety and reliability. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

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

[0025] Figure 2 A cross-sectional view of the assembly structure of the disposable injection pen provided in this application;

[0026] Figure 3 for Figure 1 Schematic diagram of the insertion end structure of the injection tray;

[0027] Figure 4 for Figure 1 Schematic diagram of the receiving cavity in the lower pen shell;

[0028] Figure 5 This is a schematic diagram of the second structure of the injection holder;

[0029] Figure 6 This is a schematic diagram of the flange structure of a pre-filled syringe;

[0030] Figure 7 for Figure 1 A schematic diagram of the structure of the protective shell. Detailed Implementation

[0031] This invention discloses an injection tray support structure and a disposable injection pen, which ensures the stability of the injection pen during operation.

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] like Figure 1 and Figure 2 As shown, Figure 1 An exploded view of the first structure of the disposable injection pen provided in this application; Figure 2 A cross-sectional view of the assembly structure of the disposable injection pen provided in this application.

[0034] This application provides a disposable injection pen, including an upper pen shell assembly and a lower pen shell assembly that are assembled and fitted together. The lower pen shell assembly includes a pen cap 001 and a protective shell 002 that is fitted inside the pen cap 001. An injection bracket 004 that supports a pre-filled syringe 005 is arranged in the inner circle of the protective shell 002. The pen cap 001 is provided with a claw extending towards the bracket, and the claw presses against the axial edge of the needle cap of the pre-filled syringe 005. The lower pen shell assembly supports the injection bracket 004 by the protective shell 002 installed inside the pen cap 001. The pre-filled syringe 005 can be fixedly installed in the injection bracket 004. The claw provided inside the pen cap 001 presses against the axial edge of the needle cap. By using the claw to lock onto the circumferential edge of the needle cap, the needle cap is subjected to an axial pull-out force. The locking structure is stable, ensuring that the needle cap can be easily pulled out.

[0035] The upper pen housing assembly is the driving part that actuates the pre-filled syringe 005 to perform the injection action. It includes an upper pen housing 008 and a driving structure disposed within the upper pen housing 008. The upper pen housing 008 and the lower pen housing 003 are inserted into each other, and the end of the upper pen housing 008 is sealed and protected by a rear cover 013.

[0036] Specifically, this embodiment achieves the injection driving function through 11 parts, including protective shell 002, locking slider 009, rotating slider 010, torsion spring 011, fixing sleeve 012, sound spring 015, sounding component 016, rotating sleeve 017, torsion spring 018, drive cover 014, nut 007, screw 019, and washer 006.

[0037] like Figure 3-7 As shown, Figure 3 for Figure 1 Schematic diagram of the insertion end structure of the injection tray; Figure 4 for Figure 1 Schematic diagram of the receiving cavity in the lower pen shell; Figure 5 This is a schematic diagram of the second structure of the injection holder; Figure 6 This is a schematic diagram of the flange structure of a pre-filled syringe; Figure 7 for Figure 1 A schematic diagram of the structure of the protective shell.

[0038] The disposable injection pen provided in this application includes an upper pen shell assembly and a lower pen shell assembly that are assembled together. The lower pen shell assembly is used to arrange a pre-filled syringe 005, and the upper pen shell assembly is used to arrange a driving device for driving the pre-filled syringe 005 to perform injection.

[0039] The lower pen housing assembly includes a pen cap 001 and a protective shell 002 that is snapped into the inner ring of the pen cap 001. The outer ring of the protective shell 002 further includes a lower pen housing 003, the first end of which is simultaneously installed inside the pen cap. The inner ring of the protective shell 002 further includes an injection holder 004, which is snapped into position with the protective shell 002. A pre-filled syringe 005 is installed within the injection holder 004. The needle cap 501 of the pre-filled syringe 005 extends into the pen cap 001 and is pressed against the axial edge of the needle cap 501 by claws arranged on the pen cap 001, so that the needle cap 501 is simultaneously removed during the removal of the pen cap 001.

[0040] In this embodiment, the pre-filled syringe 005 is placed and the protective shell 002 is retracted through the injection bracket 004.

[0041] The pre-filled syringe 005 includes a body, which protects the needle tip with a needle cap 501. The body also has an injection end with a flange 045. The flange 045 is a racetrack-shaped flange, which includes a double-arc edge structure and a straight edge structure. The straight edge structure and the arc edge structure are connected by a flange chamfer 046.

[0042] The pre-filled syringe 005 is assembled inside the injection holder 004. Its proximal end abuts against the end face of the injection holder 004 through the flange 045 to form an axial limit. Its distal cylindrical body is arranged to form an interference fit or clearance fit with the through hole of the injection holder 004 to form a radial limit.

[0043] In the preferred embodiment, the flange support end of the injection bracket 004 has a flange portion 040 for accommodating the flange portion 045. The flange portion 040 has an annular arm plate structure. The inner ring of the flange portion 040 forms a recess for accommodating the flange portion. The outer ring of the flange portion 040 has a protrusion 041. The inner wall surface of the receiving cavity 0091 of the lower pen shell 003 has a groove 042 recessed towards the wall thickness side. During the process of assembling the injection bracket 004 into the lower pen shell 003, the protrusion 041 falls into the groove 042 of the lower pen shell 003, thereby achieving a fixed connection between the two.

[0044] This design is applicable to flanges with a racetrack-shaped flange feature (flange part 045) and flanges with a chamfered angle (flange part 046) at the intersection of arc segments and straight segments (flange part 045). The inner surface of the flange portion 040 is provided with a contour feature (044), which is suitable for mating with the racetrack-shaped flange feature of the pre-filled syringe 005. This prevents the flange feature from deflecting during the process of accommodating the pre-filled syringe 005, which could cause the product to fail to start.

[0045] Meanwhile, the inner surface of the flange portion 040 is also provided with a contour feature 044 at the intersection of the arc segment and the straight segment, which is suitable for matching with the flange chamfer 046 on the flange feature of the pre-filled syringe 005, and has sufficient deformation space to install the flange chamfer 046 with large deformation, thus having greater compatibility.

[0046] In a specific embodiment of this case, the inner surface of the flange portion 040 of the injection holder 004 is provided with a recessed feature 047, which is suitable for providing deformation space when the protrusion 041 of the injection holder 004 is assembled into the groove 042 of the lower pen shell 003, thus facilitating assembly. Specifically, the middle part of the straight segment of the flange portion 040 has a first recessed feature that is thinned along the wall thickness direction, and the middle part of the curved segment has a second recessed feature that is thinned along the wall thickness direction. The first and second recessed features make the flange portion 040 as a whole a wall plate structure with varying thickness. When the flange portion 040 and the flange portion 045 are pressed at the circumferential end face, the recessed feature 047 can form a deformation space, reserving deformation allowance and reducing assembly difficulty.

[0047] In a specific embodiment of this case, the flange portion 040 causes the flange support end of the injection bracket 004 to form an annular groove. The center of the injection bracket 004 is the through hole of the pre-filled syringe 005. A secondary groove is formed by recessing inward on the bottom surface of the annular groove. The annular groove and the secondary groove are connected. A central flange is formed between the secondary groove and the through hole of the pre-filled syringe 005. The central flange abuts against the injection back side of the flange portion 045.

[0048] Multiple support ribs connect the central flange and flange portion 040, and these ribs are evenly distributed around the central flange. The axial height of the support ribs is approximately flush with the height of the central flange. When flange portion 045 is assembled onto injection bracket 004, the end faces of the support ribs directly contact the injection back side of flange portion 045, thus constructing a multi-point support system between the injection back side of flange portion 045 and injection bracket 004. This multi-point support structure, formed by multiple support ribs, transforms the support for flange portion 045 of pre-filled syringe 005 from traditional surface contact to local line or point contact, significantly reducing the precision requirements for the flatness of the injection back side of flange portion 045. Even when the injection back side of flange portion 045 experiences surface flatness issues due to processing, resulting in microscopic unevenness or dimensional errors, multiple support ribs can still form a line or point support structure to ensure stable force transmission, thereby reducing contact stability issues caused by surface flatness problems on the injection back side and improving contact safety and reliability.

[0049] In one specific embodiment of this case, the injection holder 004 is mounted on the lower pen housing 003. After the injection holder 004 is assembled into place, the protrusion 041 is engaged with the groove 042 on the lower pen housing via the protrusion 041 on the flange portion 040 and the groove 042 on the lower pen housing. The protruding structure of the protrusion 041 is a trapezoidal cross-section protrusion with a gradually changing curvature or a hemispherical protrusion. Its top working surface is polished to reduce the coefficient of friction, thereby maintaining the structural strength and surface finish when the pen is inserted into the groove 042 by compression.

[0050] A protective shell 002 is also arranged between the lower pen housing 003 and the injection holder 004. During injection, the protective shell 002 is pressed down and retracts axially under force. It slides backward and pushes the rotating slider 010 and the locking slider 009 to activate, exposing the needle and simultaneously activating the injection function of the injection pen. After injection, the protective shell 002 automatically springs back to its original position, forming a rigid barrier to prevent punctures during reuse or disposal.

[0051] The protective shell 002 has a pair of radially opposite support arms 049, which extend axially from the protective shell 002. The pair of support arms 049 are located on both sides of the injection holder 004. Specifically, the inner side of the support arm 049 is pressed against the straight section of the flange portion 040. When the protective shell 002 slides axially, the flange portion 040 is always in contact with the inner side of the support arm 049 to maintain the extended state of the support arm 049 and prevent it from radially retracting, which would affect the working stability.

[0052] Furthermore, the inner side of the support arm 049 is provided with protruding ribs 050 arranged along its extension direction. The support arm 049 is pressed against the flange portion 040 by the protruding ribs 050 to form a pressing fit. The extended end of the support arm 049 is an arm plate structure with a certain width. Preferably, two protruding ribs 050 are arranged, and they are symmetrically arranged on both sides of the width direction of the extended arm plate structure of the support arm 049, so as to provide stable lateral support for the support arm 049.

[0053] By setting the flange portion 040 of the injection bracket 004 to a racetrack-shaped structure corresponding to the flange portion 045, the outer surface of the straight section of the flange portion 040 forms a sectional feature 048, which is suitable for cooperating with the rib 050 on the support arm 049 of the protective shell 002, preventing the support arm 049 of the protective shell 002 from shrinking inward during the injection process, thus preventing product failure.

[0054] The protective shell 002 and the injection holder 004 have an axial sliding fit. The telescopic structure of the protective shell 002 is supported by the support arm 049 and the flange portion 040 of the injection holder 004, preventing inward retraction. At the same time, the protective shell 002 needs to maintain a locking fit with the injection holder 004 during and after pressing to prevent the protective shell 002 from coming out of the lower pen shell 003.

[0055] In this embodiment, a fixed beam-type inner arm plate is installed between the flange portion 040 and the end of the injection bracket 004. This inner arm plate adopts a double-end fixed structure and preferably also has a central support point. The front end of the inner arm plate is rigidly connected to the flange portion 040, and the rear end is fixedly connected to the thickened end of the bracket, forming a fixed support structure with excellent mechanical properties. The inner arm plate and the flange portion 040 together form an anti-inward shrinkage structure that supports the inner end face of the support arm. This arrangement makes the inner arm plate exhibit the deformation characteristics of a fixed beam when subjected to lateral loads, effectively suppressing the warping deformation of the support plate of the protective shell 002 under inward shrinkage force.

[0056] The inner surface of the inner arm plate facing the central axis of the injection holder 004 remains flush with the inner wall of the holder to ensure smooth assembly of the vial. In a preferred structure, a support gap is provided between the injection holder 004 and the inner arm plate through a hole in the middle, and a guide protrusion 043 is formed on the outer surface of the inner arm plate. This guide protrusion 043 is preferably designed as a trapezoidal cross-section protrusion or a hemispherical protrusion with a gradually changing curvature, and its top working surface is polished to reduce the coefficient of friction. The height H of the protrusion is designed to be slightly greater than the wall thickness of the support arm 049 to form reliable mechanical interference after assembly. The inner arm plate is a set of two support arms corresponding to the protective shell 002.

[0057] A guide protrusion 043 is provided on the inner arm plate, and a guide groove 143 is formed on the support arm 049 of the protective shell 002, which is arranged axially. The guide groove 143 is a through groove. When the protective shell 002 is pressed, the guide protrusion 043 slides within the guide groove 143. The guide groove 143 can slide and engage with the guide protrusion 043 in the width direction to form an open guide channel similar to a "slide rail". The width W of the guide groove 143 is designed to form a clearance fit with the maximum width of the guide protrusion 043.

[0058] During the pressing operation, when the user presses the protective shell 002 axially, the protective shell 002 slides axially relative to the injection tray 004. At this time, the guide protrusion 043 is embedded in the guide groove 143 and slides axially thereafter. Because the sidewall of the guide groove 143 forms a double-sided guiding constraint on the guide protrusion 043, it ensures that the protective shell 002 maintains precise axial alignment during axial reciprocating motion, avoiding jamming caused by misalignment. During this sliding process, the support arm 049 utilizes its cantilever beam characteristics to generate moderate elastic deformation, providing the necessary clearance space for the pressing stroke.

[0059] After the pressing is completed, the protective shell 002 returns to its original position under the elastic force. The guide protrusion 043 then abuts and limits the sliding out of the guide groove 143, preventing the protective shell 002 from sliding out between the lower pen shell 003 and the injection holder 004. When the user releases the pressing force, the protective shell 002 automatically returns to its original position under the force of the return spring on the upper pen shell. At this time, the guide protrusion 043 slides in the opposite direction relative to the guide groove 143 with the inner arm plate, moving to a position close to the end of the groove. The stop side of the guide protrusion 043 abuts and limits the movement of the end stop surface (or groove edge) of the guide groove 143. The root of the guide protrusion 043 is a stepped surface, which forms a rigid mechanical stop when it contacts or surfaces the edge of the guide groove 143. This type of contact limit effectively prevents the guide protrusion 043 from continuing to slide out of the groove, thereby limiting the axial displacement of the protective shell 002 within the predetermined stroke range and completely preventing the protective shell 002 from accidentally slipping out of the assembly gap between the lower pen shell 003 and the injection bracket 004.

[0060] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those 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 invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An injection tray support structure, characterized in that, The device includes an injection tray and a pre-filled syringe disposed within the injection tray, the pre-filled syringe having a flange portion, and the injection tray having a flange support end for supporting the flange portion. The flange support end has a flange portion that accommodates the flange portion, and the inner ring of the flange portion forms a groove that accommodates the flange portion. The settling tank is equipped with a support structure that provides multi-point support for the flange portion; The inner surface of the flange portion is provided with a recessed feature, which is adapted to provide a deformation space for accommodating the flange portion when the pre-filled syringe is inserted into the injection holder; The flange portion causes the injection holder to form an annular groove, the bottom of the annular groove is recessed inward to form a secondary groove, and a central flange is formed between the secondary groove and the central through hole of the injection holder; the support structure consists of a plurality of support ribs disposed between the central flange and the flange portion.

2. The injection support structure according to claim 1, characterized in that, The flange support end has a flange portion for accommodating the flange portion. The flange portion has an annular arm plate structure, and the inner ring of the flange portion forms a groove for accommodating the flange portion.

3. The injection support structure according to claim 2, characterized in that, The flange portion has a racetrack-shaped flange feature, and the inner surface of the flange portion is provided with a conforming feature suitable for engaging with the racetrack-shaped flange feature.

4. The injection bracket support structure according to claim 3, characterized in that, The straight section of the flange portion has a first recessed feature that is thinned along the wall thickness direction, and the arc section of the flange portion has a second recessed feature that is thinned along the wall thickness direction. The first recessed feature and the second recessed feature make the flange portion have a wall panel structure with varying thickness.

5. A disposable injection pen, comprising a lower pen housing and a pre-filled syringe disposed within the lower pen housing, characterized in that, The lower pen housing is provided with a refractive bracket, and the injection bracket has an injection bracket support structure as described in any one of claims 1-4 to support the pre-filled syringe.

6. The disposable injection pen according to claim 5, characterized in that, A protective shell is also arranged between the lower pen housing and the injection holder. The protective shell has a pair of support arms arranged radially opposite each other. The pair of support arms are located on both sides of the injection holder, and the inner side of the support arm is pressed against the straight section of the flange portion.

7. The disposable injection pen according to claim 6, characterized in that, The inner side of the support arm is provided with protruding ribs arranged along its extension direction. The support arm is pressed against the flange portion by the protruding ribs to form a pressing fit.

8. The disposable injection pen according to claim 7, characterized in that, Two ribs are arranged, and they are symmetrically arranged on both sides of the arm plate structure extending from the support arm in the width direction.

9. The disposable injection pen according to claim 8, characterized in that, A fixed beam-type inner arm plate is installed between the flange portion of the injection bracket and the bracket end of the injection bracket. The inner arm plate is provided with guide protrusions, and the support arm of the protective shell is provided with guide grooves arranged along the axial direction. The guide protrusions are guided to slide within the guide grooves.

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