Disposable protective injection pen

Abstract

Provided is a disposable protective injection pen, which comprises a lower shell assembly body (1) and an upper pen shell assembly body (2). The lower shell assembly body (1) comprises a lower pen shell (11) at the outside and a syringe body (12) located and contained in a cavity formed in the lower pen shell (11). The upper pen shell assembly body (2) is located on the upper portion where the lower shell assembly body (1) is located. A sliding block member (23) of the upper pen shell assembly body (2) is arranged, by means of an auxiliary spring (231), on the inner wall where an upper pen shell (21) is located, and meanwhile, a main body member (22) is located in the middle portion where the sliding block member (23) is located and is vertically and movably connected in a penetrating mode. An inner push rod member (24) is movably connected, by means of a main spring (241), in an inner cavity where the main body member (22) is located, and a first limiting mechanism (25) is formed by the outer wall of the inner push rod member (24) and the middle portion where the inner push rod member (24) is located. A second limiting mechanism (26) is formed by the bottom of the main body member (22) and the position where the bottom of the sliding block member (23) is located. The whole device can enable injection by the syringe body (12) by using a pure mechanical mechanism and achieve protection of a syringe needle, and it is convenient to carry and simple to operate.

Description

A disposable protective injection pen Technical Field

[0001] The invention belongs to the technical field of injection pens, and in particular relates to a disposable protective injection pen. Background Art

[0002] An injection pen is a medical device designed specifically for injecting medications. It resembles a regular pen, hence the name. This pen combines medication, a syringe, a needle, and a dose adjustment device. To use it, simply press a button on the pen to inject the medication.

[0003] Injection pens are convenient, quick, and accurate. Patients can self-inject medications, reducing the workload of medical staff and preventing inaccurate injections due to human error. The design of these pens is also more user-friendly, making them more comfortable and reducing pain for patients. Currently, most injection pens require manual aspiration followed by injection, which can pose safety risks both in terms of aspiration and syringe recovery.

[0004] Chinese patent application publication number CN 106890382 A discloses a smart injection pen, comprising a pen body, which includes an injection drive mechanism, an injection assembly, a power supply assembly, a control and display assembly, a housing assembly, and an automatic needle advance and retraction mechanism. The injection assembly also includes a refill, a needle, and a skin positioning member. This achieves full automation, enabling precise control of the injection point, needle insertion depth, and injection metering, avoiding the uncertainty of traditional direct needle insertion and the negative effects of needle phobia in some patients. However, this structure contains a battery, which can damage the internal circuitry if left unused for extended periods. Furthermore, the stability of this battery structure is also affected by the storage environment, seriously impacting safety. Furthermore, for those who travel regularly, it cannot be used in certain situations, posing a safety hazard.

[0005] Summary of the Invention

[0006] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a disposable protective injection pen to solve the above-mentioned technical problems existing in the prior art.

[0007] The purpose of the present invention can be achieved through the following technical solutions:

[0008] A disposable protective injection pen, comprising a lower shell assembly and an upper pen shell assembly.

[0009] The lower housing assembly includes an external lower pen housing and a syringe body supported inside a cavity formed by the lower pen housing, and the upper pen housing assembly is located above the lower housing assembly;

[0010] The upper pen housing assembly includes an upper pen housing, a main body, a slider, and an inner push rod. The slider is arranged on the inner wall of the upper pen housing via a secondary spring. The main body is located in the middle of the slider and is movably connected to the slider up and down. The inner push rod is movably connected to the middle cavity of the main body via a main spring. The outer wall of the inner push rod and the middle of the inner push rod form a first limiting mechanism. The bottom of the main body and the bottom of the slider form a second limiting mechanism.

[0011] After the inner push rod is freed from the restraint of the first limiting mechanism, the main spring drives the inner push rod to form a downward thrust, and simultaneously forms an extrusion injection on the syringe body mounted on the lower shell assembly, until the inner push rod is completely moved to the bottom of the main body, and the main body rebounds upward along the inner diameter of the slider, and the slider slides downward under the action of the secondary spring until the main body and the slider are locked with each other by the second limiting mechanism, thereby forming a vertical locking of the main body, the slider and the inner push rod.

[0012] Furthermore, a pen cap is provided at the front end portion where the lower shell assembly is located, and the pen cap is used to cover the lower end portion of the lower pen shell.

[0013] Furthermore, a protective shell is sleeved on the inner wall where the lower pen shell is located, and the protective shell is movably connected up and down along the inner wall where the lower pen shell is located.

[0014] Furthermore, the slider is a cylindrical structure with a through middle and open ends, and the auxiliary spring is located in a gap formed between the slider and the upper pen housing;

[0015] The main body presents a cylindrical structure with a closed top and an open bottom, and the inner push rod is implanted into the middle cavity where the main body is located through the main spring.

[0016] Furthermore, the first limiting mechanism includes a first limiting groove located on the outer wall of the middle part of the inner push rod, and a first protrusion located in the middle part of the main body and biased inward, so that the first protrusion is biased inward and forms a mutual engagement with the first limiting groove, so that the main spring located in the inner push rod is in a compressed state. When the first limiting groove is freed from the restraint of the first protrusion, the main spring drives the inner push rod as a whole to move downward.

[0017] Furthermore, a fixed block bracket is provided at the lower end position of the main body, and the fixed block bracket is located between the slider member of the upper pen shell assembly and the protective shell of the lower shell assembly. At the same time, ears extend from both sides of the fixed block bracket to fix the ears to the inside of the upper pen shell and form support for the bottom of the main body.

[0018] Furthermore, the middle part of the fixed block bracket is penetrated by an inner push rod, and at the same time, the second protrusion located on the main body forms a snap connection with the middle through hole of the fixed block bracket when under pressure, and realizes the snap connection between the second protrusion and the fixed block bracket when it is disengaged.

[0019] Furthermore, the second limiting mechanism includes a second limiting groove located on the wall of the slider, and a second protruding member located at the bottom of the main body and deflected outwards;

[0020] The second protrusion forms a lock on the lower end of the sliding member. At the same time, when the second protrusion is disengaged from the lock on the lower end of the middle through hole of the fixed block bracket, it moves upward along the axis of the inner push rod and is again limited by the vertical displacement of the second limiting groove on the sliding member.

[0021] Furthermore, under the action of the auxiliary spring, the slider is pressed downward to form a downward pushing effect on the protective shell provided on the inner wall of the lower pen shell.

[0022] Furthermore, a guide groove is provided at the bottom of the inner wall of the central through hole where the slider is located, and the main body is enabled to move in the central through hole where the slider is located along the axis extending direction of the guide groove.

[0023] Beneficial effects of the present invention:

[0024] 1. The device adopts a purely mechanical structure to realize the injection of drugs into the syringe, and after the injection is completed, it forms a protective effect on the needle. It is easy to operate, has low requirements for the storage conditions of the equipment, and has a long storage period. It has a stable structure and higher applicability.

[0025] 2. After the first limiter mechanism is released, the internal push rod of this device squeezes downward under the reaction force of the main spring, injecting the liquid in the syringe. After the injection is completed, the secondary spring can drive the slider again to push the protective shell in the opposite direction. Therefore, the needle is extended before the injection is completed and is automatically wrapped and protected after the injection is completed.

[0026] 3. The slider member used in this device is located on the inner wall where the upper pen shell is located, so it does not affect the propulsion of the push rod body, and can realize the compact design of the overall mechanism and is easy to carry. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] 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 describing the embodiments or the prior art.

[0028] FIG1 is a schematic diagram of the overall structure of an embodiment of the present invention;

[0029] FIG2 is a schematic diagram of the overall explosion structure of an embodiment of the present invention;

[0030] FIG3 is a schematic diagram of the overall structure of the main body of an embodiment of the present invention;

[0031] FIG4 is a schematic diagram of a cross-sectional structure of a main body member according to an embodiment of the present invention;

[0032] 5 is a schematic diagram of the overall structure of a slider according to an embodiment of the present invention;

[0033] FIG6 is a schematic diagram of the overall structure of the inner push rod according to an embodiment of the present invention;

[0034] 7 is a schematic diagram of the structure of the fixed block bracket according to an embodiment of the present invention;

[0035] FIG8 is a schematic cross-sectional view of the inner push rod before pushing according to an embodiment of the present invention;

[0036] 9 is a schematic cross-sectional view of the inner push rod when pushing an embodiment of the present invention;

[0037] FIG10 is a schematic diagram of the structure of part A in FIG9 according to an embodiment of the present invention;

[0038] 11 is a schematic partial cross-sectional structure diagram of the upper pen housing assembly when the inner push rod is pushed according to an embodiment of the present invention;

[0039] 12 is a schematic cross-sectional view of the overall structure of the second limiting mechanism after the main inner push rod is pushed out of the restraint state according to an embodiment of the present invention;

[0040] 13 is a schematic partial cross-sectional view of the main body in a locked state according to an embodiment of the present invention;

[0041] FIG14 is a schematic diagram of a partial cross-sectional structure of the main body in a rebound state according to an embodiment of the present invention. DETAILED DESCRIPTION

[0042] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0043] As shown in Figures 1 and 2, an embodiment of the present invention provides a disposable protective injection pen, which includes a lower shell assembly 1 and an upper pen shell assembly 2. A pen cap 3 is provided at the front end of the lower shell assembly 1, and the pen cap 3 is used to cover the lower end of the lower pen shell 11.

[0044] The lower shell assembly 1 includes an external lower pen shell 11 and a syringe body 12 supported inside the cavity formed by the lower pen shell 11. The upper pen shell assembly 2 is located on the upper part of the lower shell assembly 1. At the same time, a protective shell 13 is provided on the inner wall of the lower pen shell 11, and the protective shell 13 is movably connected up and down along the inner wall of the lower pen shell 11. This protective shell 13 is used after the injection of the syringe body 12 is completed.

[0045] As shown in Figures 3 and 4, the upper pen shell assembly 2 includes an upper pen shell 21, a main body 22, a slider 23, and an inner push rod 24. The slider 23 is arranged on the inner wall of the upper pen shell 21 through a secondary spring 231, and the slider 23 can be pushed down by the secondary spring 231. At the same time, the main body 22 is located in the middle of the slider 23 and realizes a movable through-connection up and down. The inner push rod 24 is movably connected to the middle cavity where the main body 22 is located through the main spring 241. The slider 23 is a cylindrical structure with a through middle and open at both ends. At the same time, the secondary spring 231 is located in the gap formed between the slider 23 and the upper pen shell 21.

[0046] The main body 22 has a cylindrical structure with a closed top and an open bottom. At the same time, the inner push rod 24 is implanted into the middle cavity where the main body 22 is located through the main spring 241. The main spring 241 pushes the inner push rod 24 downward, thereby forming a downward pressure injection on the syringe body 12 located in the lower shell assembly 1.

[0047] As shown in FIG6 , the outer wall of the inner push rod 24 and the middle portion of the inner push rod 24 form a first limiting mechanism 25. The first limiting mechanism 25 includes a first limiting groove 240 located on the outer wall of the middle portion of the inner push rod 24, and a first protrusion 221 located inwardly in the middle portion of the main body 22. The first protrusion 221 is deflected inwardly and engages with the first limiting groove 240, thereby compressing the main spring 241 located in the inner push rod 24. When the first limiting groove 240 is released from the restraint of the first protrusion 221, the main spring 241 drives the inner push rod 24 downward as a whole. After the inner push rod 24 is released from the restraint of the first limiting mechanism 25, the main spring 241 drives the inner push rod 24 to form a downward thrust, and simultaneously squeezes and injects the syringe body 12 mounted on the lower housing assembly 1 until the inner push rod 24 is completely released from the main body 22 to the bottom.

[0048] As shown in Figure 7, a fixed block bracket 4 is provided at the lower end position of the main body 22. The fixed block bracket 4 is located between the slider 23 of the upper pen shell assembly 2 and the protective shell 13 of the lower shell assembly 1. At the same time, ears 41 extend from both sides of the fixed block bracket 4 to fix the ears to the inside of the upper pen shell 21 and form support for the bottom of the main body 22. At the same time, the middle part of the fixed block bracket 4 is penetrated by the inner push rod 24, and the second protrusion 222 on the main body 22 forms a snap connection with the middle through hole of the fixed block bracket 4 when under pressure (at this time, the inner push rod 24 is located in the middle of the main body 22, and the through hole in the middle of the fixed block bracket 4 is limited to the inner push rod 24 and cannot realize the overall passage of the main body 22). When the second protrusion 222 is disengaged from the snap connection with the fixed block bracket 4, the connection between the main body 22 and the fixed block bracket 4 is restrained.

[0049] When the inner push rod 24 is pushed down to the lowest part of the main body 22, the second protrusion 222 is offset inward and forms a disengagement from the engagement with the fixed block bracket 4, thereby achieving the lifting of the main body 22 relative to the fixed block bracket 4 until the main body 22 is limited by the second limiting mechanism 26 located between the slider 23.

[0050] As shown in Figure 5, the bottom of the main body 22 and the bottom of the slider 23 form a second limiting mechanism 26; then the second limiting mechanism 26 located at the bottom of the main body 22 is released from the restraint, and the main body 22 rebounds upward along the inner diameter of the slider 23, and simultaneously realizes the downward sliding of the slider 23 under the action of the auxiliary spring 231. The second limiting mechanism 26 includes a second limiting groove 230 located on the wall of the slider 23, and a second protrusion 222 located at the bottom of the main body 22 and biased outward.

[0051] The second protrusion 222 locks the lower end of the slider 23. When the second protrusion 222 is released from the lock with the lower end of the slider 23, it moves upward along the slider 23 and is again restrained in the vertical direction by the second limiting groove 230 on the slider 23. At this time, under the action of the second limiting mechanism 26, the vertical distance between the main body 22, the slider 23, and the inner push rod 24 is maximized, thereby squeezing the protective shell 13 in the lower pen housing 11 forward and protecting the needle at the front end of the syringe body 12.

[0052] In order to ensure the stability of the sliding member 23 in the vertical sliding direction, a guide groove 232 is provided at the bottom of the inner wall of the central through hole where the sliding member 23 is located, and the main body 22 is enabled to move in the central through hole where the sliding member 23 is located along the axial extension direction of the guide groove 232.

[0053] As shown in FIG8 and FIG9 , during specific use, the first limiting mechanism 25 first forms a mutual clamping between the inner push rod 24 and the main body 22 . Subsequently, the protective shell 13 on the inner wall of the lower pen shell 11 is lifted upward (at this time, the protective shell 13 first contacts the human skin tissue and continues to squeeze, and then the protective shell 13 moves upward), and the protective shell 13 synchronously drives the slider 23 located in the upper pen shell 21 to lift. When the bottom of the slider 23 moves to the side where the first protrusion 221 of the main body 22 is located, the squeezing formed on the outer periphery of the first protrusion 221 is released, thereby realizing the separation of the first protrusion 221 of the main body 22 and the first limiting groove 240 of the inner push rod 24, so that the inner push rod 24 is pressed down by the main spring 241, thereby squeezing the syringe body 12 (completely squeezing out the injection liquid in the syringe body 12). At this time, the side position where the secondary spring 231 is located is squeezed by the slider 23, and the protective shell 13 is also in a compressed state, thereby realizing the complete deployment of the needle at the front end of the syringe body 12.

[0054] When the inner push rod 24 is pushed by the main spring 241, until the top of the inner push rod 24 is completely placed at the bottom of the main body 22, the second protrusion 222 at the bottom of the main body 22 is disengaged from the limit on the bottom of the fixed block bracket 4 and forms an upward lift, thereby realizing that the main body 22 continues to lift. At the same time, the slider 23 is squeezed downward under the action of the secondary spring 231 until the second protrusion 222 at the bottom of the main body 22 and the second limiting groove 230 on the slider 23 are locked with each other to form a second limiting mechanism 26. This second limiting mechanism 26 forms a locking between the main body 22, the slider 23, and the inner push rod 24 in the vertical direction (the top of the main body 22 is already at the top of the upper pen shell 21).

[0055] As shown in Figures 10-14, the slider member 23 is simultaneously moved downward under the action of the auxiliary spring 231, and the protective shell 13 located in the lower shell assembly 1 continues to move downward. At this time, the protective shell 13 can form a protection for the needle member at the front end of the syringe body 12. At the same time, the main body member 22, the slider member 23, and the inner push rod member 24 are locked with each other, and will not cause the protective shell 13 to rebound again, thereby ensuring that the needle member at the front end of the syringe body 12 avoids secondary damage.

[0056] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and modifications fall within the scope of the invention as claimed.

Claims

1. A disposable protective injection pen, comprising a lower shell assembly (1) and an upper pen shell assembly (2), characterized in that: The lower housing assembly (1) comprises an external lower pen housing (11) and a syringe body (12) located inside a cavity formed by the lower pen housing (11), and the upper pen housing assembly (2) is located above the lower housing assembly (1); The upper pen shell assembly (2) comprises an upper pen shell (21), a main body (22), a slider (23), and an inner push rod (24); the slider (23) is arranged on the inner wall of the upper pen shell (21) through a secondary spring (231); the main body (22) is located in the middle of the slider (23) and is movably connected up and down; the inner push rod (24) is movably connected in the middle cavity of the main body (22) through a main spring (241); the outer wall of the inner push rod (24) and the middle of the inner push rod (24) form a first limiting mechanism (25); the bottom of the main body (22) and the bottom of the slider (23) form a second limiting mechanism (26); After the inner push rod (24) is freed from the restraint of the first limiting mechanism (25), the main spring (241) drives the inner push rod (24) to form a downward thrust, and simultaneously forms an extrusion injection on the syringe body (12) mounted on the lower shell assembly (1), until the inner push rod (24) is completely moved to the bottom of the main body (22), and the main body (22) rebounds upward along the inner diameter of the slider (23), and the slider (23) slides downward under the action of the auxiliary spring (231), until the main body (22) and the slider (23) are locked and limited with each other by the second limiting mechanism (26), thereby locking the main body (22), the slider (23) and the inner push rod (24) in the vertical direction.

2. The disposable protective injection pen according to claim 1, characterized in that: A pen cap (3) is provided at the front end portion where the lower shell assembly (1) is located, and the pen cap (3) is used to cover the lower end portion of the lower pen shell (11).

3. The disposable protective injection pen according to claim 1, characterized in that: A protective shell (13) is sleeved on the inner wall where the lower pen shell (11) is located, and the protective shell (13) is movably connected up and down along the inner wall where the lower pen shell (11) is located.

4. The disposable protective injection pen according to claim 1, characterized in that: The slider (23) is a cylindrical structure with a through middle and open ends, and the auxiliary spring (231) is located in a gap formed between the slider (23) and the upper pen housing (21); The main body (22) presents a cylindrical structure with a closed top and an open bottom, and the inner push rod (24) is implanted into the middle cavity where the main body (22) is located through a main spring (241).

5. The disposable protective injection pen according to claim 1, characterized in that: The first limiting mechanism (25) includes a first limiting groove (240) located on the outer wall of the middle part of the inner push rod (24), and a first protrusion (221) located inwardly biased in the middle part of the main body (22), so that the first protrusion (221) is biased inwardly and forms a mutual engagement with the first limiting groove (240), so that the main spring (241) located in the inner push rod (24) is in a compressed state. When the first limiting groove (240) is separated from the restraint of the first protrusion (221), the main spring (241) drives the inner push rod (24) to move downward as a whole.

6. The disposable protective injection pen according to claim 3, characterized in that: A fixed block bracket (4) is arranged at the lower end of the main body (22), and the fixed block bracket (4) is located between the slider (23) of the upper pen shell assembly (2) and the protective shell (13) of the lower shell assembly (1) for transition between the user, and ears (41) are extended from both sides of the fixed block bracket (4) so ​​that the ears are fixed inside the upper pen shell (21) and form support for the bottom of the main body (22).

7. The disposable protective injection pen according to claim 6, characterized in that: The middle part of the fixed block bracket (4) is penetrated by an inner push rod (24), and the second protrusion (222) located on the main body (22) forms a snap connection with the middle through hole of the fixed block bracket (4) when under pressure, and realizes the snap connection between the second protrusion (222) and the fixed block bracket (4) when it is disengaged.

8. The disposable protective injection pen according to claim 7, characterized in that: The second limiting mechanism (26) comprises a second limiting groove (230) located on the wall of the sliding block (23), and a second protruding member (222) located at the bottom of the main body (22) and deviating outwards; The second protrusion (222) forms a lock with the lower end of the sliding block member (23). At the same time, when the second protrusion (222) is separated from the lock with the lower end of the middle through hole of the fixed block bracket (4), it moves upward along the axis of the inner push rod member (24) and is again limited by the second limiting groove (230) located on the sliding block member (23) in the vertical direction.

9. The disposable protective injection pen according to claim 3, characterized in that: The slider (23) is pressed downward by the auxiliary spring (231) to push down the protective shell (13) disposed on the inner wall of the lower pen shell (11).

10. The disposable protective injection pen according to claim 1, characterized in that: A guide groove (232) is provided at the bottom of the inner wall of the middle through hole where the slider member (23) is located, and enables the main body member (22) to move in the middle through hole where the slider member (23) is located along the axis extension direction where the guide groove (232) is located.

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