Disposable protective injection pen

Abstract

The invention discloses a disposable protective injection pen which comprises a lower shell assembly and an upper shell assembly, the lower shell assembly comprises an external lower shell and an injector body borne in a cavity formed by the lower shell, and the upper shell assembly is located on the upper portion where the lower shell assembly is located; a sliding block piece of an upper pen shell assembly is arranged on the inner wall where an upper pen shell is located through an auxiliary spring, meanwhile, a main body piece is located in the middle of the sliding block piece and vertically and movably connected in a penetrating mode, and an inner push rod piece is movably connected into a middle cavity where the main body piece is located through a main spring. The outer wall of the inner push rod piece and the middle of the inner push rod piece form a first limiting mechanism, and the bottom of the main body piece and the bottom of the sliding block piece form a second limiting mechanism. The whole device can adopt a pure mechanical mechanism to achieve injection of the syringe body and protection of the syringe needle, and is convenient to carry and operate.

Description

Technical Field

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

[0002] An injection pen is a medical device specifically used for injecting medications. It resembles an ordinary pen in appearance, so it is also called an injection pen. This injection pen combines a medication, a syringe, an injection needle, a dose adjustment device, etc. Together. When in use, just press the button on the injection pen to inject the medication.

[0003] The injection pen is characterized by being convenient, fast, and accurate. Patients can inject the medication by themselves, reducing the workload of medical staff. At the same time, it can also avoid inaccurate medication injection caused by human error. The design of the injection pen is also more user-friendly and more comfortable to use, reducing the pain of patients. Currently, most uses of injection pens involve manual quantitative aspiration followed by injection, and there are certain safety risks in both quantitative aspiration and syringe recycling.

[0004] In Chinese Patent Application Publication No. CN106890382A, an intelligent injection pen is disclosed, which includes a pen main body. The pen main body includes an injection driving mechanism, an injection assembly, a power supply assembly, a control and display assembly, a housing assembly, and an automatic needle advancing and retracting mechanism. The injection assembly further includes a pen core, a needle, and a skin positioning member, achieving full automation. The injection point, the insertion depth of the needle, and the injection dosage can all be accurately controlled, avoiding the uncertainties of the traditional direct needle insertion method and the negative impacts such as needle fear of some patients. However, this structure contains a battery component. If it is not used for a long time, it will cause damage to the internal circuit, and the stability of this battery structure is also affected by the storage environment, seriously affecting the use safety. And for people traveling for a long time, it cannot be used in some specific occasions, which will cause certain safety hazards. Summary of the Invention

[0005] Aiming at the deficiencies 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.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A disposable protective injection pen includes a lower housing assembly and an upper pen shell assembly.

[0008] The lower housing assembly includes an external lower pen shell and a syringe body carried inside the cavity formed by the lower pen shell. At the same time, the upper pen shell assembly is located above the lower housing assembly.

[0009] The upper pen shell assembly includes an upper pen shell, a main body part, a slider part, and an inner push rod part. The slider part is arranged on the inner wall where the upper pen shell is located through a secondary spring. At the same time, the main body part is located in the middle of the slider part and is connected through up-and-down movable penetration. The inner push rod part is movably connected in the middle cavity where the main body part is located through a main spring. And a first limiting mechanism is formed between the outer wall of the inner push rod part and the middle part where the inner push rod part is located. A second limiting mechanism is formed at the position where the bottom of the main body part and the bottom of the slider part are located.

[0010] After the inner push rod part is released from the restraint of the first limiting mechanism, the main spring drives the inner push rod part to form a downward thrust, and simultaneously squeezes and injects the syringe body installed on the lower shell assembly until the inner push rod part completely moves to the bottom of the main body part, and the main body part rebounds upward along the inner diameter where the slider part is located, and simultaneously under the action of the secondary spring, the slider part slides downward until the main body part and the slider part are locked and limited to each other through the second limiting mechanism, thereby forming a lock on the main body part, the slider part, and the inner push rod part in the vertical direction.

[0011] Further, a pen cap is provided at the front end of the lower shell assembly, and the pen cap is used to cover the lower end of the lower pen shell.

[0012] Further, a protective shell is sleeved on the inner wall of the lower pen shell, and the protective shell is connected to move up and down along the inner wall of the lower pen shell.

[0013] Further, the slider part is a cylindrical structure with a through middle part and open ends at both ends, and at the same time, the secondary spring is located in the gap formed between the slider part and the upper pen shell.

[0014] The main body part presents a cylindrical structure with a closed top and an open bottom, and at the same time, the inner push rod part is implanted into the middle cavity where the main body part is located through a main spring.

[0015] Further, the first limiting mechanism includes a first limiting groove on the outer wall of the middle part of the inner push rod part and a first protruding part that deflects inward in the middle of the main body part, so that the first protruding part deflects inward and forms an interlocking with the first limiting groove, thereby making the main spring in the inner push rod part in a compressed state. When the first limiting groove is released from the restraint of the first protruding part, the main spring drives the whole inner push rod part to move downward.

[0016] Further, a fixed block bracket is provided at the lower end position of the main body part. The fixed block bracket is used for transition between the slider part of the upper pen shell assembly and the protective shell of the lower shell assembly. At the same time, ears extend out from both sides of the fixed block bracket, and the ears are fixed inside the upper pen shell and form a support for the bottom of the main body part.

[0017] Furthermore, the middle part where the fixed block bracket is located is penetrated by the inner push rod member. At the same time, a second convex member on the main body member forms a snap connection with the through hole in the middle part where the fixed block bracket is located when being pressed, and realizes that when the second convex member disengages from the snap connection with the fixed block bracket.

[0018] Furthermore, the second limiting mechanism includes a second limiting groove on the wall of the slider member and a second convex member on the bottom of the main body member that deflects outward;

[0019] The second convex member forms a lock on the lower end of the slider member. At the same time, when the second convex member disengages from the lock on the lower end of the through hole in the middle part of the fixed block bracket, it displaces upward along the axis of the inner push rod member and is re-limited by the displacement of the second limiting groove on the slider member in the vertical direction.

[0020] Furthermore, under the action of the auxiliary spring, the slider member presses down to form a downward pushing action on the protective shell arranged on the inner wall of the lower pen shell.

[0021] Furthermore, a guide groove is provided at the bottom of the inner wall of the middle through hole where the slider member is located, and the main body member is enabled to move in the middle through hole where the slider member is located along the extending direction of the axis of the guide groove.

[0022] Advantages of the present invention:

[0023] 1. The pure mechanical structure adopted by the present device realizes the injection of drugs into the syringe. After the injection is completed, it forms a protective effect on the needle. The operation is convenient, the requirements for the storage conditions of the device are not high, the storage period is long, the structure is stable, and the applicability is higher.

[0024] 2. After the first limiting mechanism is released, the inner push rod adopted by the present device is squeezed downward under the reaction force of the main spring to realize the injection of the liquid medicine in the syringe. After the injection is completed, the auxiliary spring can drive the slider member again to form a reverse push on the protective shell. Therefore, the needle is in an extended state before the injection is completed, and the needle is automatically wrapped and protected after the injection is completed.

[0025] 3. The slider member adopted by the present device is located on the inner wall of the upper pen shell member, so it does not affect the pushing effect of the main body of the push rod member, and a compact design of the overall mechanism member can be realized, which is convenient to carry. Description of the Drawings

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art.

[0027] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention;

[0028] Figure 2 It is a schematic diagram of the overall explosion structure of an embodiment of the present invention;

[0029] Figure 3 It is a schematic diagram of the overall structure of the main body part of an embodiment of the present invention;

[0030] Figure 4 It is a schematic diagram of the cross-sectional structure of the main body part of an embodiment of the present invention;

[0031] Figure 5 It is a schematic diagram of the overall structure of the slider part of an embodiment of the present invention;

[0032] Figure 6 It is a schematic diagram of the overall structure of the inner push rod part of an embodiment of the present invention;

[0033] Figure 7 It is a schematic diagram of the fixed block bracket structure of an embodiment of the present invention;

[0034] Figure 8 It is a schematic diagram of the cross-sectional structure before the inner push rod part is pushed in an embodiment of the present invention;

[0035] Figure 9 It is a schematic diagram of the cross-sectional structure when the inner push rod part is pushed in an embodiment of the present invention;

[0036] Figure 10 It is an embodiment of the present invention Figure 9 Partial structure schematic diagram at position A;

[0037] Figure 11 It is a partial cross-sectional structure schematic diagram of the upper pen shell assembly when the inner push rod part is pushed in an embodiment of the present invention;

[0038] Figure 12 It is a schematic diagram of the overall cross-sectional structure when the second limiting mechanism is disengaged after the main inner push rod part is pushed in an embodiment of the present invention;

[0039] Figure 13 It is a partial cross-sectional structure schematic diagram of the locking state of the main body part in an embodiment of the present invention;

[0040] Figure 14 It is a partial cross-sectional structure schematic diagram of the rebound state of the main body part in an embodiment of the present invention. Detailed implementation manners

[0041] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0042] Such as Figure 1 、 Figure 2As shown in the figure, an embodiment of the present invention provides a disposable protective injection pen, which includes a lower housing assembly 1 and an upper pen housing assembly 2. A pen cap 3 is provided at the front end where the lower housing assembly 1 is located, and the pen cap 3 is used to cover the lower end of the lower pen housing 11.

[0043] The lower housing assembly 1 includes an external lower pen housing 11 and a syringe body 12 carried inside the cavity formed by the lower pen housing 11. The upper pen housing assembly 2 is located above the lower housing assembly 1. At the same time, a protective shell 13 is sleeved on the inner wall where the lower pen housing 11 is located, and the protective shell 13 is connected to move up and down along the inner wall where the lower pen housing 11 is located. This protective shell 13 is used after the injection of the syringe body 12 is completed.

[0044] As Figure 3 , Figure 4 shown in the figure, the upper pen housing assembly 2 includes an upper pen housing 21, a main body member 22, a slider member 23, and an inner push rod member 24. The slider member 23 is arranged on the inner wall where the upper pen housing 21 is located through a secondary spring 231, and can form a downward push on the slider member 23 through the secondary spring 231. At the same time, the main body member 22 is located in the middle of the slider member 23 and is connected to penetrate up and down. The inner push rod member 24 is movably connected in the middle cavity where the main body member 22 is located through a main spring 241. The slider member 23 is a cylindrical structure with a through middle and open ends at both ends. At the same time, the secondary spring 231 is located in the gap formed between the slider member 23 and the upper pen housing 21.

[0045] The main body member 22 presents a cylindrical structure with a closed top and an open bottom. At the same time, the inner push rod member 24 is implanted into the middle cavity where the main body member 22 is located through the main spring 241, and a downward push on the inner push rod member 24 is formed through the main spring 241, so as to form a downward pressure injection on the syringe body 12 located in the lower housing assembly 1.

[0046] As Figure 6 shown in the figure, and a first limiting mechanism 25 is formed between the outer wall of the inner push rod member 24 and the middle part where the inner push rod member 24 is located. The first limiting mechanism 25 includes a first limiting groove 240 on the outer wall of the middle part of the inner push rod member 24 and a first protruding member 221 that is biased inward in the middle of the main body member 22, so that the first protruding member 221 is biased inward and forms an interlocking with the first limiting groove 240, so that the main spring 241 located in the inner push rod member 24 is in a compressed state. When the first limiting groove 240 is released from the restraint of the first protruding member 221, the main spring 241 drives the inner push rod member 24 to move downward as a whole. After the inner push rod member 24 is released from the restraint of the first limiting mechanism 25, the main spring 241 drives the inner push rod member 24 to form a downward thrust, and simultaneously forms an extrusion injection on the syringe body 12 installed on the lower housing assembly 1 until the inner push rod member 24 completely disengages from the main body member 22 to the bottom.

[0047] AsFigure 7 As shown, a fixed block bracket 4 is provided at the lower end 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 for user handling. At the same time, earpieces 41 extend from both sides of the fixed block bracket 4, and the earpieces are fixed inside the upper pen shell 21 and form a 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 convex part 222 on the main body 22 forms a snap connection with the through hole in the middle of the fixed block bracket 4 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 achieve the overall passage of the main body 22). When the second convex part 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 restricted.

[0048] When the inner push rod 24 is pushed down to the lowest part of the main body 22, the second convex part 222 deflects inward and disengages from the snap connection with the fixed block bracket 4, thus realizing 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 between the slider 23.

[0049] As Figure 5 shown, a second limiting mechanism 26 is formed at the positions of the bottom of the main body 22 and the bottom of the slider 23. Subsequently, the second limiting mechanism 26 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 at the same time, the slider 23 slides downward under the action of the auxiliary spring 231. The second limiting mechanism 26 includes a second limiting groove 230 on the wall of the slider 23 and a second convex part 222 that extends outward from the bottom of the main body 22.

[0050] The second convex part 222 forms a lock on the lower end of the slider 23. At the same time, when the second convex part 222 is disengaged from the lock on the lower end of the slider 23, it moves upward along the slider 23 and is re-limited by the displacement of the second limiting groove 230 on the slider 23 in the vertical direction. At this time, under the action of the second limiting mechanism 26, the distance between the main body 22, the slider 23, and the inner push rod 24 in the vertical direction is maximized, thus realizing the forward extrusion of the protective shell 13 in the lower pen shell 11 and protecting the needle at the front end of the syringe body 12.

[0051] To ensure the stability of the slider 23 sliding in the vertical direction, a guide groove 232 is provided at the bottom of the inner wall of the through hole in the middle of the slider 23, and the main body 22 moves in the through hole in the middle of the slider 23 along the extension direction of the axis of the guide groove 232.

[0052] As Figure 8 , Figure 9 shown, during specific use, first, the first limiting mechanism 25 forms an interlocking between the inner push rod member 24 and the main body member 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 be squeezed, and then the protective shell 13 moves upward), and the protective shell 13 synchronously drives the lifting of the slider member 23 located in the upper pen shell 21. When the bottom of the slider member 23 moves to the side where the first convex member 221 of the main body member 22 is located, the extrusion formed on the outer periphery of the first convex member 221 is released at this time. Therefore, the first convex member 221 of the main body member 22 is separated from the first limiting groove 240 of the inner push rod member 24, and the inner push rod member 24 is pressed down by the main spring 241, forming an extrusion of the syringe body 12 (completely extruding the injection solution located in the syringe body 12). At this time, the side position where the auxiliary spring 231 is located is squeezed by the slider member 23, and the protective shell 13 is also in a compressed state, realizing the complete expansion of the needle tip at the front end of the syringe body 12.

[0053] When the inner push rod member 24 is pushed by the main spring 241 until the top of the inner push rod member 24 is completely placed at the bottom of the main body member 22, the second convex member 222 located at the bottom of the main body member 22 is disengaged from the limit of the bottom of the fixed block bracket 4 and forms an upward lift at the same time, thereby realizing the continuous lift of the main body member 22. At the same time, the slider member 23 forms a downward extrusion under the action of the auxiliary spring 231 until the second convex member 222 at the bottom of the main body member 22 is locked with the second limiting groove 230 on the slider member 23, forming a second limiting mechanism 26. This second limiting mechanism 26 forms a lock in the vertical direction among the main body member 22, the slider member 23, and the inner push rod member 24 (the top of the main body member 22 has been located at the top where the upper pen shell 21 is located).

[0054] As Figures 10 - 14 shown, it is synchronously realized that the slider member 23 moves downward under the action of the auxiliary spring 231 and forms a continuous downward movement of the protective shell 13 located in the lower housing assembly 1. At this time, the protective shell 13 can protect the needle tip 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 the protective shell 13 will not rebound again, thereby ensuring that the needle tip at the front end of the syringe body 12 is avoided from causing secondary damage.

[0055] The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and what is described in the above embodiments and the specification is only to illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will also have various changes and improvements, and these changes and improvements fall within the scope of the present invention claimed.

Claims

1. A disposable protective injection pen, comprising a lower housing assembly (1) and an upper pen housing assembly (2), characterized in that, the lower housing assembly (1) includes an outer lower pen shell (11) and a syringe body (12) carried inside the cavity formed by the lower pen shell (11). At the same time, the upper pen housing assembly (2) is located above the lower housing assembly (1); the upper pen housing assembly (2) includes an upper pen shell (21), a main body member (22), a slider member (23), and an inner push rod member (24). The slider member (23) is arranged on the inner wall of the upper pen shell (21) through a secondary spring (231). At the same time, the main body member (22) is located in the middle of the slider member (23) and is connected through up-and-down movable penetration. The inner push rod member (24) is movably connected in the middle cavity of the main body member (22) through a main spring (241). And a first limiting mechanism (25) is formed between the outer wall of the inner push rod member (24) and the middle part where the inner push rod member (24) is located. A second limiting mechanism (26) is formed at the position where the bottom of the main body member (22) and the bottom of the slider member (23) are located; After the inner push rod member (24) is released from the restraint of the first limiting mechanism (25), the main spring (241) drives the inner push rod member (24) to form a downward thrust, and simultaneously forms an extrusion injection on the syringe body (12) installed on the lower housing assembly (1) until the inner push rod member (24) completely moves to the bottom of the main body member (22), and the main body member (22) rebounds upward along the inner diameter of the slider member (23), and simultaneously, under the action of the secondary spring (231), the slider member (23) slides downward until the main body member (22) and the slider member (23) are locked and limited to each other through the second limiting mechanism (26), thereby forming a lock on the main body member (22), the slider member (23), and the inner push rod member (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 of the lower housing assembly (1), and the pen cap (3) is used to cover the lower end of the lower pen shell (11).

3. The disposable protective injection pen according to claim 1, wherein A protective shell (13) is sleeved on the inner wall of the lower pen shell (11), and the protective shell (13) is connected to move up and down along the inner wall of the lower pen shell (11).

4. The disposable protective injection pen according to claim 1, wherein The slider member (23) is a tubular structure with a middle penetration and open ends at both ends. At the same time, the secondary spring (231) is located in the gap formed between the slider member (23) and the upper pen shell (21); The main body member (22) presents a tubular structure with a closed top and an open bottom. At the same time, the inner push rod member (24) is implanted into the middle cavity of the main body member (22) through the main spring (241).

5. The disposable protective injection pen according to claim 1, wherein The first limiting mechanism (25) includes a first limiting groove (240) on the outer wall of the middle part of the inner push rod member (24), and a first protruding member (221) on the middle part of the main body member (22) that biases inward, so that the first protruding member (221) biases inward and forms an interlocking engagement with the first limiting groove (240), thereby making the main spring (241) located in the inner push rod member (24) in a compressed state. When the first limiting groove (240) breaks free from the restraint of the first protruding member (221), the main spring (241) drives the entire inner push rod member (24) to move downward.

6. The disposable protective injection pen according to claim 3, wherein, A fixed block bracket (4) is provided at the lower end position of the main body member (22). The fixed block bracket (4) is located between the slider member (23) of the upper pen shell assembly (2) and the protective shell (13) of the lower shell assembly (1) for user transition. At the same time, ears (41) extend from both sides of the fixed block bracket (4), and the ears are fixed inside the upper pen shell (21) and form a support for the bottom of the main body member (22).

7. The disposable protective injection pen according to claim 6, wherein, The middle part of the fixed block bracket (4) is penetrated by the inner push rod member (24). At the same time, a second protruding member (222) on the main body member (22) forms an engaging connection with the through hole in the middle of the fixed block bracket (4) before being pressed, and when the second protruding member (222) disengages from the engagement with the fixed block bracket (4).

8. The disposable protective injection pen according to claim 7, wherein, The second limiting mechanism (26) includes a second limiting groove (230) on the wall of the slider member (23), and a second protruding member (222) on the bottom of the main body member (22) that biases outward; The second protruding member (222) forms a lock on the lower end of the slider member (23). At the same time, when the second protruding member (222) disengages from the lock on the lower end of the through hole in the middle of the fixed block bracket (4), it displaces upward along the axis of the inner push rod member (24) and is re-limited by the displacement of the second limiting groove (230) on the slider member (23) in the vertical direction.

9. The disposable protective injection pen according to claim 3, characterized in that, Under the action of the auxiliary spring (231), the slider member (23) presses down to form a downward pushing action on the protective shell (13) provided on the inner wall of the lower pen shell (11).

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

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