Injection device

Abstract

This invention discloses an injection device comprising a syringe body, a container, a needle hub, a cap, a vial adapter, and a drug needle. The container is disposed on the syringe body, the needle hub is engaged with the container, the cap is removably mounted on the syringe body, the vial adapter is detachably engaged with the needle hub, the vial adapter is used to secure a vial, and the drug needle is disposed on the needle hub and has a drug flow channel communicating with an internal space of the container to allow a drug to flow from the internal space of the vial to the internal space of the container.

Description

Technical Field

[0001] This invention relates to an injection device, and more particularly to an injection device suitable for use with medicine bottles and capable of preventing the drug needle from being deformed or damaged by torque when the medicine bottle is removed. Prior Technology

[0002] An injection device is a device designed to deliver medication. Existing injection devices are typically designed to hold pre-filled medication cartridges that can be directly inserted into the device. However, in many applications, medication is delivered in vials, and existing injection devices lack a transfer mechanism to transfer the medication from the vial to the medication container. Therefore, they are unsuitable for vial-based medication preparation. To meet the diverse application requirements, injection devices urgently need improvement. Summary of the Invention

[0003] One objective of this invention is to provide an injection device suitable for use with medicine bottles and capable of preventing the needle from being deformed or damaged by torque when the medicine bottle is removed, thereby solving the above-mentioned problems.

[0004] To achieve the above objectives, the present invention discloses an injection device comprising a syringe body, a container, a needle hub, a cap, a vial adapter, and a drug needle. The container is disposed on the syringe body, the needle hub is engaged with the container, the cap is removably mounted on the syringe body, the vial adapter is detachably engaged with the needle hub, the vial adapter is used to secure a vial, and the drug needle is disposed on the needle hub and has a drug flow channel communicating with an internal space of the container to allow a drug to flow from the internal space of the vial to the internal space of the container.

[0005] According to one embodiment of the present invention, the needle hub includes a first rotation limiting structure, and the vial adapter includes a second rotation limiting structure. When the vial adapter is engaged with the needle hub, the second rotation limiting structure is non-rotatably engaged with the first rotation limiting structure. The non-rotatable engagement of the first rotation limiting structure and the second rotation limiting structure prevents the vial adapter and the needle hub from rotating relative to each other about a central axis extending in a longitudinal direction of the vial, and allows the vial adapter and the needle hub to move linearly relative to each other in the longitudinal direction.

[0006] According to one embodiment of the present invention, the first rotation limiting structure includes a first limiting feature, and the second rotation limiting structure includes a limiting space and a second limiting feature. The first limiting feature is used to extend into the limiting space along the second limiting feature to complete the non-rotational engagement of the first rotation limiting structure and the second rotation limiting structure.

[0007] According to one embodiment of the present invention, the cross-sectional shape of the restricted space corresponds to the cross-sectional shape of the first restricted feature and both are non-circular.

[0008] According to one embodiment of the present invention, one of the first limiting feature and the second limiting feature forms a protruding section, and the other of the first limiting feature and the second limiting feature forms a recessed section for at least partially accommodating the protruding section.

[0009] According to one embodiment of the present invention, the injection device further includes an air needle, which is disposed on the second rotation limiting structure of the vial adapter or integrally formed with the second rotation limiting structure of the vial adapter. The air needle is used to insert into the vial and has an air passage that communicates with the internal space of the vial to allow air to flow into the internal space of the vial. The drug needle is disposed on the first rotation limiting structure of the needle holder and is used to insert into the vial. When the second rotation limiting structure is non-rotatably engaged with the first rotation limiting structure, the air needle and the drug needle are disposed adjacent to each other and are both parallel to the central axis of the vial extending in the longitudinal direction.

[0010] According to one embodiment of the present invention, the injection device further includes a shielding member disposed on the syringe body and extendable or retractable relative to the syringe body in a longitudinal direction to shield or expose the drug needle, and when the vial adapter is engaged with the needle hub, the shielding member is located in a space defined between the vial adapter and the syringe body.

[0011] According to one embodiment of the present invention, the injection device further includes an elastic member, which, when the cap is removed from the syringe body along the longitudinal direction, drives the shielding member to extend out of the syringe body along the longitudinal direction to shield the drug needle.

[0012] According to one embodiment of the present invention, the cap is used to accommodate the medicine bottle adapter and the medicine bottle, and the medicine bottle adapter is used to partially accommodate the medicine bottle.

[0013] According to one embodiment of the present invention, the medicine bottle adapter includes at least one elastic hook structure for fixing the medicine bottle, and the cap includes a wall segment for guiding the medicine bottle so that one of the length directions of the medicine bottle is aligned with a longitudinal direction. When the at least one elastic hook structure fixes the medicine bottle, the wall segment surrounds the medicine bottle.

[0014] According to one embodiment of the present invention, the cap includes at least one first rotational engagement structure, and the vial adapter includes at least one second rotational engagement structure. The at least one second rotational engagement structure is rotatably engaged with the at least one first rotational engagement structure, and when the cap rotates relative to the syringe body about a central axis extending in a longitudinal direction of the vial, the rotational engagement of the at least one first rotational engagement structure and the at least one second rotational engagement structure enables the cap to rotate relative to the vial adapter.

[0015] According to one embodiment of the present invention, when the cap is removed from the syringe body along the longitudinal direction, the rotational engagement of the at least one first rotational engagement structure and the at least one second rotational engagement structure enables the cap to drive the vial adapter to move along the longitudinal direction together with the cap.

[0016] According to one embodiment of the present invention, one of the at least one first rotational fitting structure and the at least one second rotational fitting structure is a single-rib structure, and the other of the at least one first rotational fitting structure and the at least one second rotational fitting structure is a double-rib structure, and the single-rib structure is movably located between the two ribs of the double-rib structure.

[0017] According to one embodiment of the present invention, the at least one first rotational fit structure and the at least one second rotational fit structure are parallel to each other.

[0018] According to one embodiment of the present invention, the at least one first rotating fit structure extends along a circumferential direction of the cap, and the at least one second rotating fit structure extends along a circumferential direction of the medicine bottle adapter.

[0019] According to one embodiment of the present invention, the syringe body includes a first abutting structure, and the cap further includes a second abutting structure. When the cap rotates relative to the syringe body, the second abutting structure cooperates with the first abutting structure to drive the cap to move along the longitudinal direction, thereby removing the cap from the syringe body.

[0020] According to one embodiment of the present invention, the first abutting structure and the second abutting structure are curved surface structures, inclined surface structures, wavy surface structures or threaded surface structures.

[0021] According to one embodiment of the present invention, the vial adapter includes a puncture structure for inserting into the vial. The puncture structure has a drug channel. Both the drug needle and the puncture structure are parallel to a central axis extending in a longitudinal direction of the vial, and one head of the needle hub is used to at least partially extend into the vial adapter.

[0022] According to one embodiment of the invention, the injection device further includes a seal for engaging with the head of the vial adapter and the needle hub.

[0023] According to one embodiment of the present invention, the puncture structure further has an air channel for communicating with the internal space of the medicine bottle to allow air to flow into the internal space of the medicine bottle.

[0024] In summary, the injection device of the present invention is suitable for drug preparation operations based on vials and can prevent the drug needle from being deformed or damaged due to torque when removing the vial. Accordingly, the injection device of the present invention provides better reliability and ease of operation during drug preparation operations. Simple Explanation of the Diagram

[0025] Figure 1 is a schematic diagram of the appearance of the injection device according to the first embodiment of the present invention. Figures 2 and 3 are exploded views of the injection device of the first embodiment of the present invention from different perspectives. Figure 4 is a partial cross-sectional schematic diagram of the injection device according to the first embodiment of the present invention. Figures 5 and 6 are schematic diagrams of the injection device of the first embodiment of the present invention from different perspectives. Figure 7 is a schematic diagram of the structure of the cover body according to the first embodiment of the present invention. Figures 8 to 10 are schematic diagrams of the partial structure of the injection device of the first embodiment of the present invention in different states. Figures 11 to 13 are schematic diagrams of the partial structure of the injection device according to different embodiments of the present invention. Figure 14 is a partial structural schematic diagram of the injection device according to the second embodiment of the present invention. Figure 15 is an exploded view of some components of the injection device according to the second embodiment of the present invention. Figures 16 to 20 are schematic diagrams of the partial structure of the injection device of the second embodiment of the present invention in different states. Figure 21 is an exploded view of some components of the injection device according to the third embodiment of the present invention. Figure 22 is a partial cross-sectional schematic diagram of the injection device according to the third embodiment of the present invention. Figure 23 is a partial structural schematic diagram of the cover body according to the third embodiment of the present invention. Figure 24 is an exploded view of some components of the injection device according to the fourth embodiment of the present invention. Figure 25 is a partial cross-sectional schematic diagram of the injection device according to the fourth embodiment of the present invention. Implementation

[0026] The directional terms used below, such as up, down, left, right, front, or back, are only for reference in the drawings. Therefore, the directional terms used are for illustrative purposes and not for limiting the invention. Furthermore, unless otherwise specified, the term "connection" as used herein includes any direct or indirect structural connection means. Therefore, if the text describes a first device coupled to a second device, it means that the first device can be directly structurally connected to the second device, or indirectly structurally connected to the second device through other devices or connection means.

[0027] Please refer to Figures 1 to 7. Figure 1 is a schematic diagram of the appearance of the injection device 1A according to the first embodiment of the present invention. Figures 2 and 3 are exploded views of the components of the injection device 1A according to the first embodiment of the present invention from different perspectives. Figure 4 is a partial cross-sectional schematic diagram of the injection device 1A according to the first embodiment of the present invention. Figures 5 and 6 are partial structural schematic diagrams of the injection device 1A according to the first embodiment of the present invention from different perspectives. Figure 7 is a structural schematic diagram of the cover 14A according to the first embodiment of the present invention. As shown in Figures 1 to 7, in the first embodiment, the injection device 1A is adapted to a vial 2A and includes a syringe body 11A, a container 12A, a needle hub 13A, a cap 14A, a vial adapter 15A, and a drug needle 16A. The container 12A is disposed on the syringe body 11A, the needle hub 13A is engaged with the container 12A, and the cap 14A is removably mounted on the syringe body 11A. The cap 14A is rotatable relative to the syringe body 11A about a central axis C extending in a longitudinal direction L of the vial 2A, and is also movable relative to the syringe body 11A in the longitudinal direction L. In this embodiment, the injection device 1A may have a pen-shaped structure, and the longitudinal direction L may be the length direction of the syringe body 11A and / or the injection device 1A. The vial adapter 15A is detachably engaged with the needle holder 13A. The vial adapter 15A is used to secure the vial 2A. The drug needle 16A is disposed on the needle holder 13A and has a drug flow channel that connects to the internal space of the container 12A to allow the drug to flow from the internal space of the vial 2A to the internal space of the container 12A. For example, as shown in Figure 4, the container 12A can be a syringe structure, which has a barrel 121A housed within the syringe body 11A and a piston 122A movable relative to the barrel 121A. Furthermore, the user can directly pull the piston 122A in the longitudinal direction L by hand or using an electric motor to drive the drug from the internal space of the vial 2A to the internal space of the container 12A, thereby completing the transfer of the drug from the vial 2A to the container 12A.

[0028] Furthermore, the injection device 1A also includes an air needle 17A, which is disposed in the vial adapter 15A and used to insert into the vial 2A. The air needle 17A has an air passage that communicates with the internal space of the vial 2A to allow air to flow into the internal space of the vial 2A, thereby achieving pressure balance and facilitating the transfer of medication from the vial 2A to the container 12A. In this embodiment, both the medication needle 16A and the air needle 17A may be made of metal, but the invention is not limited to this embodiment. For example, in another embodiment, the air needle may be made of plastic and may be integrally formed in the vial adapter through, for example, injection molding.

[0029] Preferably, the cap 14A can be used to accommodate the medicine bottle adapter 15A and the medicine bottle 2A, and the medicine bottle adapter 15A can be used to partially accommodate the medicine bottle 2A.

[0030] Specifically, as shown in Figures 2 to 6, the medicine bottle adapter 15A includes at least one resilient hook structure 151A for fixing (e.g., snapping) the medicine bottle 2A, and the cap 14A includes a wall segment 141A for guiding the medicine bottle 2A so that the length direction of the medicine bottle 2A is aligned with the longitudinal direction L, and when the resilient hook structure 151A fixes the medicine bottle 2A, the wall segment 141A surrounds the medicine bottle 2A.

[0031] Preferably, as shown in Figures 2 to 7, the cap 14A further includes at least one first rotating engagement structure 142A (as shown in Figures 4 and 7), and the medicine bottle adapter 15A includes at least one second rotating engagement structure 152A, which is rotatably engaged with the first rotating engagement structure 142A.

[0032] In this embodiment, the first rotational engagement structure 142A and the second rotational engagement structure 152A can be a single-rib structure and a double-rib structure, respectively. When the first rotational engagement structure 142A and the second rotational engagement structure 152A are rotated and engaged with each other, the single-rib structure (i.e., the first rotational engagement structure 142A) can be movably located between the two ribs of the double-rib structure (i.e., the second rotational engagement structure 152A). However, the present invention is not limited to this embodiment. For example, in another embodiment, the first rotational engagement structure can be a double-rib structure, and the second rotational engagement structure can be a single-rib structure located between the two ribs of the double-rib structure.

[0033] Preferably, the first rotational fit structure 142A and the second rotational fit structure 152A can be parallel to each other.

[0034] Preferably, the first rotating fit structure 142A can extend along the circumferential direction of the cap 14A, and the second rotating fit structure 152A can extend along the circumferential direction of the medicine bottle adapter 15A.

[0035] When the cap 14A rotates relative to the syringe body 11A about the central axis C extending longitudinally L of the vial 2A, the rotational engagement of the first rotational engagement structure 142A and the second rotational engagement structure 152A allows the cap 14A to rotate independently relative to the vial adapter 15A without causing the vial adapter 15A to rotate. This prevents the vial adapter 15A from further causing the vial 2A to rotate relative to the drug needle 16A and / or the air needle 17A, thereby preventing the drug needle 16A from being deformed or damaged due to the torsional force caused by the rotation of the vial 2A relative to the drug needle 16A and / or the air needle 17A. Furthermore, when the cap 14A is removed from the syringe body 11A along the longitudinal direction L, the rotational engagement of the first rotational engagement structure 142A and the second rotational engagement structure 152A allows the cap 14A to move the vial adapter 15A along the longitudinal direction L with the cap 14A.

[0036] In this embodiment, the elastic hook structure 151A and the second rotational engagement structure 152A can be located on the same side of the medicine bottle adapter 15A; however, the present invention is not limited to this embodiment. For example, in another embodiment, the elastic hook structure and the second rotational engagement structure can be located on opposite sides of the medicine bottle adapter.

[0037] Furthermore, as shown in Figures 2 and 3, to make the removal of the cap 14A more intuitive, the syringe body 11A includes a first abutting structure 111A, and the cap 14A includes a second abutting structure 143A. When the cap 14A rotates relative to the syringe body 11A, the second abutting structure 143A cooperates with the first abutting structure 111A to drive the cap 14A to move in the longitudinal direction L, thereby removing the cap 14A from the syringe body 11A. In this way, the user only needs to apply torque to the cap 14A without applying longitudinal force to complete the removal of the cap 14A.

[0038] In this embodiment, the first abutting structure 111A and the second abutting structure 143A may be wavy surface structures; however, the present invention is not limited to this embodiment. For example, in another embodiment, the first abutting structure and the second abutting structure may be curved surface structures, inclined surface structures, or threaded surface structures.

[0039] Preferably, as shown in Figures 2, 3, 5 and 6, the needle holder 13A includes a first rotation limiting structure 131A, and the vial adapter 15A includes a second rotation limiting structure 153A. When the vial adapter 15A is engaged with the needle holder 13A, the second rotation limiting structure 153A is non-rotatably engaged with the first rotation limiting structure 131A. The non-rotatable engagement of the first rotation limiting structure 131A and the second rotation limiting structure 153A prevents the vial adapter 15A and the needle holder 13A from rotating relative to each other about the central axis C extending in the longitudinal direction L of the vial, and allows the vial adapter 15A and the needle holder 13A to move linearly relative to each other in the longitudinal direction L. The non-rotational engagement of the first rotation limiting structure 131A and the second rotation limiting structure 153A can effectively prevent the vial adapter 15A from accidentally rotating relative to the needle holder 13A due to the frictional force between the first rotational engagement structure 142A and the second rotational engagement structure 152A when the cap 14A rotates, thereby maintaining the structural integrity of the drug needle 16A and / or the air needle 17A.

[0040] Specifically, the first rotation limiting structure 131A includes a first limiting feature 1311A, and the second rotation limiting structure 153A includes a limiting space 1531A and a second limiting feature 1532A. The first limiting feature 1311A is used to extend into the limiting space 1531A along the second limiting feature 1532A to complete the non-rotational engagement of the first rotation limiting structure 131A and the second rotation limiting structure 153A.

[0041] Preferably, the cross-sectional shape of the confining space 1531A corresponds to the cross-sectional shape of the first confining feature 1311A and both are non-circular.

[0042] Preferably, the first limiting feature 1311A forms a protruding segment P, and the other of the second limiting features 1532A forms a recessed segment R that is useful for at least partially accommodating the protruding segment P.

[0043] Preferably, as shown in Figure 5, the air needle 17A is disposed in the second rotation restriction structure 153A of the vial adapter 15A, and the drug needle 16A is disposed in the first rotation restriction structure 131A of the needle holder 13A.

[0044] In this embodiment, when the second rotation limiting structure 153A is non-rotatably engaged with the first rotation limiting structure 131A, the air needle 17A and the drug needle 16A are arranged adjacent to each other and are both parallel to the central axis C extending in the longitudinal direction L of the medicine bottle, and offset from the central axis C extending in the longitudinal direction L of the medicine bottle 2A. However, the present invention is not limited to this embodiment. For example, in another embodiment, one of the air needle and the drug needle may coincide with the central axis of the medicine bottle.

[0045] Furthermore, as shown in Figures 2, 3, and 4, the injection device 1A further includes a shielding member 18A and an elastic member 19A. The shielding member 18A is disposed on the syringe body 11A and can extend or retract relative to the syringe body 11A in the longitudinal direction L to shield or expose the drug needle 16A. When the vial adapter 15A is engaged with the needle holder 13A, the shielding member 18A is located within the space defined between the vial adapter 15A and the syringe body 11A. When the cap 14A is removed from the syringe body 11A in the longitudinal direction L, the elastic member 19A drives the shielding member 18A to extend out of the syringe body 11A in the longitudinal direction L to shield the drug needle 16A, thereby preventing the drug needle 16A from being directly contacted; on the other hand, the shielding member 18A can be pressed by the patient's skin and retracted relative to the syringe body 11A to compress the elastic member 19A to expose the drug needle 16A, thereby allowing the drug needle 16A to be inserted into the patient's skin.

[0046] Preferably, at least one guide structure G is formed on the shield 18A, which cooperates with the syringe body 11A to guide the movement direction of the shield 18A. For example, the guide structure G may be a guide groove structure.

[0047] Please also refer to Figures 4 and 8 to 10, which are schematic diagrams of the partial structure of the injection device 1A of the first embodiment of the present invention in different states. As shown in Figures 4 and 8 through 10, the user can insert the vial 2A into the injection device 1A through the opening of the cap 14A and fix it with the elastic hook structure 151A, thereby allowing the drug needle 16A and the air needle 17A to be inserted into the vial 2A to allow the transfer of the drug. After the drug transfer is completed, the user can rotate the cap 14A from the position shown in Figure 9 to the position shown in Figure 10, thereby moving the vial 2A and the vial adapter 15A longitudinally along a first direction D1, thereby completing the removal of the vial 2A. When the cap 14A of the injection device 1A is rotated, it does not cause the vial 2A to rotate relative to the drug needle 16A and / or the air needle 17A. Therefore, the injection device 1A can effectively prevent the drug needle 16A and / or the air needle 17A from being deformed or damaged due to the torsional force during the removal of the vial 2A.

[0048] It is worth noting that the structural relationship between the vial adapter 15A and the needle holder 13A of the present invention is not limited to that shown in the drawings of this embodiment. For example, please refer to Figures 11 to 13, which are partial structural schematic diagrams of the injection device of different embodiments of the present invention. As shown in Figures 11 to 13, the cross-sectional shape of a limiting space 1531 and the cross-sectional shape of a first limiting feature 1311 can be changed according to actual needs, and a drug needle 16 and an air needle 17 can be arranged adjacent to or spaced apart according to actual needs.

[0049] Please refer to Figures 14 to 20. Figure 14 is a partial structural schematic diagram of the injection device 1B according to the second embodiment of the present invention. Figure 15 is an exploded view of some components of the injection device 1B according to the second embodiment of the present invention. Figures 16 to 20 are partial structural schematic diagrams of the injection device 1B according to the second embodiment of the present invention in different states. As shown in Figures 14 to 20, the injection device 1B of the second embodiment is similar to the injection device 1A of the first embodiment. Unlike the first embodiment, the injection device 1B of the second embodiment further includes a rotating member 10B. The rotating member 10B is disposed between a syringe body 11B and an elastic member 19B, that is, the elastic member 19B abuts between a shielding member 18B and the rotating member 10B. The shielding member 18B includes at least one driving structure 181B. The syringe body 11B includes at least one first positioning structure 112B. The rotating member 10B includes at least one first mating structure 101B, at least one second mating structure 102B, and at least one second positioning structure 103B.

[0050] When the shielding member 18B is pressed by the vial adapter (not shown in the figure) during the assembly process and moves away from the extended position along a second direction D2, the drive structure 181B and the first mating structure 101B can slide against each other to drive the rotating member 10B to rotate from the position shown in Figure 16 to the position shown in Figure 17, so that the injection device 1B switches from the state shown in Figure 16 to the state shown in Figure 17 and elastically compresses the elastic member 19B.

[0051] When the shielding member 18B is released by removing the cover (not shown in the figure), under the elastic recovery of the elastic member 19B, the first positioning structure 112B and the second positioning structure 103B can slide and abut against each other to drive the rotating member 10B to rotate from the position shown in Figure 17 to the position shown in Figure 18, so that the injection device 1B switches from the state shown in Figure 17 to the state shown in Figure 18, thereby allowing the shielding member 18B to pop out and return to the extended position.

[0052] When the shielding member 18B is pressed by the patient's skin during drug injection and moves away from the extended position again along the second direction D2, the drive structure 181B and the second mating structure 102B can slide and abut against each other to drive the rotating member 10B to rotate from the position shown in Figure 18 to the position shown in Figure 19, so that the injection device 1B switches from the state shown in Figure 18 to the state shown in Figure 19 and elastically compresses the elastic member 19B.

[0053] When the shielding member 18B is released after injection, under the elastic recovery of the elastic member 19B, the first positioning structure 112B and the second positioning structure 103B can slide and abut against each other again to drive the rotating member 10B to rotate from the position shown in Figure 19 to the position shown in Figure 20, so that the injection device 1B switches from the state shown in Figure 19 to the state shown in Figure 20, thereby allowing the shielding member 18B to pop out again and return to the extended position.

[0054] In this embodiment, when the injection device 1B is in the state shown in Figure 20, the first mating structure 101B can block the drive structure 181B to prevent the shielding member 18B from retracting along the second direction D2, thereby preventing a drug needle 16B from being exposed after injection.

[0055] Please refer to Figures 21 to 23. Figure 21 is an exploded view of some components of the injection device 1C according to the third embodiment of the present invention. Figure 22 is a partial cross-sectional schematic diagram of the injection device 1C according to the third embodiment of the present invention. Figure 23 is a partial structural schematic diagram of the cover 14C according to the third embodiment of the present invention. As shown in Figures 21 to 23, the injection device 1C of the third embodiment is similar to the injection device 1A of the first embodiment. Unlike the first embodiment, the vial adapter 15C of the third embodiment includes a puncture structure 154C. The puncture structure 154C is used to puncture a vial 2C and has a drug channel 1541C, which allows the drug to flow out of the vial 2C when the puncture structure 154C is inserted into the vial 2C. A drug needle 16C is parallel to the central axis of the vial 2C extending in the longitudinal direction L. Specifically, the drug-eluting needle 16C and the puncture structure 154C coincide on the central axis extending longitudinally L of the vial 2C. The head of a needle hub 13C is used to extend into the vial adapter 15C, and the drug-eluting needle 16C is located within the vial adapter 15C and has a drug flow channel, which can connect to the drug channel 1541C when the head of the needle hub 13C is extended into the vial adapter 15C. In this embodiment, since the drug-eluting needle 16C is exempt from any torsional force, the head of the needle hub 13C can be engaged with the vial adapter 15C in a rotatable or non-rotatable manner.

[0056] Furthermore, the injection device 1C also includes a seal 10C, which engages between the head of the vial adapter 15C and the needle holder 13C to prevent drug leakage. For example, the seal 10C may be a rubber O-ring.

[0057] Preferably, the puncture structure 154C also has an air channel 1542C, which allows air to flow into the medicine bottle 2C when the puncture structure 154C is inserted into the medicine bottle 2C. That is, in this embodiment, the medicine bottle adapter 15C does not need to be provided with a separate air needle.

[0058] Furthermore, in this embodiment, an elastic hook structure 151C for fixing the medicine bottle 2C and a second rotating engagement structure 152C for engaging the first rotating engagement structure 142C of the cap 14C can be located on opposite sides of the medicine bottle adapter 15C, respectively.

[0059] The rest of the structure in this embodiment is the same as in the first embodiment, and for the sake of simplicity, it will not be described again here.

[0060] Please refer to Figures 24 and 25. Figure 24 is an exploded view of some components of the injection device 1D according to the fourth embodiment of the present invention, and Figure 25 is a partial cross-sectional schematic diagram of the injection device 1D according to the fourth embodiment of the present invention. As shown in Figures 24 and 25, the injection device 1D of the fourth embodiment is similar to the injection device 1C of the third embodiment. The difference from the third embodiment is that in the fourth embodiment, a puncture structure 154D coincides with the central axis of a vial 2D, and a drug-eluting needle 16D is offset from the central axis of the vial 2D. The remaining structures of this embodiment are the same as those of the third embodiment, and for the sake of simplicity, will not be described again here.

[0061] Compared to existing technologies, the injection device of this invention is suitable for drug preparation operations based on vials and can prevent the drug needle from being deformed or damaged due to torque when removing the vial. Accordingly, the injection device of this invention provides better reliability and ease of operation during drug preparation operations. The above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made in accordance with the claims of the present invention shall be covered by the present invention.

[0062] 101B: First mating structure 102B: Second mating structure 103B: Second positioning structure 10B: Rotating component 10C: Seals 111A: First abutment structure 112B: First positioning structure 11A, 11B: Syringe body 12A: Container 1311A, 1311: First restrictive feature 131A: First rotation restriction structure 13A, 13C: Pin hub 141A: Wall Section 142A, 142C: First rotational fit structure 143A: Second abutment structure 14A, 14C: Cover 151A, 151C: Flexible snap hook structure 152A, 152C: Second rotational fit structure 1531A, 1531: Constrained Space 1532A: Second Restrictive Feature 153A: Second rotation restriction structure 1541C: Drug pathway 1542C: Air passage 154C, 154D: Puncture structure 15A, 15C: Medicine bottle adapter 16A, 16, 16C, 16D, 16B: Drug needles 17A,17: Air needle 181B: Drive Structure 18A, 18B: Shielding components 19A, 19B: Elastic elements 1A, 1B, 1C, 1D: Injection device 2A, 2C, 2D: Medicine bottles C: Central axis D1: First Direction D2: Second Direction G: Guiding Structure L: Vertical direction P: Protruding segment R: Depressed section

Claims

1. An injection device comprising: a syringe body; a container disposed on the syringe body; a needle hub engaged with the container, the needle hub including a first rotation limiting structure; a cap removably mounted on the syringe body; a vial adapter detachably engaged with the needle hub, the vial adapter for securing a vial, the vial adapter including a second rotation limiting structure, wherein when the vial adapter is engaged with the needle hub, the second rotation limiting structure is non-rotatably engaged with the first rotation limiting structure, the non-rotatable engagement of the first rotation limiting structure and the second rotation limiting structure prevents the vial adapter and the needle hub from rotating relative to each other about a central axis extending in a longitudinal direction of the vial and allows the vial adapter and the needle hub to move linearly relative to each other in the longitudinal direction; A drug needle disposed on a needle holder and having a drug flow channel, the drug flow channel being connected to an internal space of the container to allow a drug to flow from an internal space of the vial to the internal space of the container; and an air needle disposed on or integrally formed on the second rotation limiting structure of the vial adapter, the air needle being inserted into the vial and having an air flow channel being connected to the internal space of the vial to allow air to flow into the internal space of the vial, the drug needle being disposed on the first rotation limiting structure of the needle holder and being inserted into the vial, and when the second rotation limiting structure is non-rotatably engaged with the first rotation limiting structure, the air needle and the drug needle are disposed adjacent to each other and are both parallel to the central axis of the vial extending in the longitudinal direction.

2. The injection device as claimed in claim 1, wherein the first rotation limiting structure includes a first limiting feature, the second rotation limiting structure includes a limiting space and a second limiting feature, the first limiting feature being extended into the limiting space along the second limiting feature to complete the non-rotational engagement of the first rotation limiting structure and the second rotation limiting structure.

3. The injection device as claimed in claim 2, wherein the cross-sectional shape of the confining space corresponds to the cross-sectional shape of the first confining feature and both are non-circular.

4. The injection device as claimed in claim 2, wherein one of the first limiting feature and the second limiting feature forms a protruding section, and the other of the first limiting feature and the second limiting feature forms a recessed section for at least partially receiving the protruding section.

5. The injection device as claimed in claim 1, further comprising a shielding member disposed on the syringe body and extendable or retractable relative to the syringe body in a longitudinal direction to shield or expose the drug needle, and wherein the shielding member is located in a space defined between the vial adapter and the syringe body when the vial adapter is engaged with the needle hub.

6. The injection device as claimed in claim 5, further comprising an elastic member that, when the cap is removed from the syringe body in the longitudinal direction, drives the shielding member to extend out of the syringe body in the longitudinal direction to shield the drug needle.

7. The injection device as claimed in claim 1, wherein the cap is used to receive the vial adapter and the vial, and the vial adapter is used to partially receive the vial.

8. The injection device as claimed in claim 7, wherein the vial adapter includes at least one resilient hook structure for securing the vial, the cap includes a wall segment for guiding the vial so that one length direction of the vial is aligned with a longitudinal direction, and the wall segment surrounds the vial when the at least one resilient hook structure secures the vial.

9. The injection device as claimed in claim 1, wherein the cap includes at least one first rotatable engagement structure, the vial adapter includes at least one second rotatable engagement structure, the at least one second rotatable engagement structure being rotatably engaged with the at least one first rotatable engagement structure, and when the cap rotates relative to the syringe body about a central axis extending in a longitudinal direction of the vial, the rotatable engagement of the at least one first rotatable engagement structure with the at least one second rotatable engagement structure enables the cap to rotate relative to the vial adapter.

10. The injection device as claimed in claim 9, wherein when the cap is removed from the syringe body along the longitudinal direction, the rotational engagement of the at least one first rotational engagement structure and the at least one second rotational engagement structure enables the cap to move the vial adapter along the longitudinal direction together with the cap.

11. The injection device as claimed in claim 9, wherein one of the at least one first rotating engagement structure and the at least one second rotating engagement structure is a single-rib structure, the other of the at least one first rotating engagement structure and the at least one second rotating engagement structure is a double-rib structure, and the single-rib structure is movably located between the two ribs of the double-rib structure.

12. The injection device as claimed in claim 11, wherein the at least one first rotational engagement structure and the at least one second rotational engagement structure are parallel to each other.

13. The injection device as claimed in claim 11, wherein the at least one first rotatable structure extends along a circumferential direction of the cap, and the at least one second rotatable structure extends along a circumferential direction of the vial adapter.

14. The injection device as claimed in claim 9, wherein the syringe body includes a first abutment structure and the cap further includes a second abutment structure, wherein when the cap rotates relative to the syringe body, the second abutment structure cooperates with the first abutment structure to move the cap along the longitudinal direction, thereby removing the cap from the syringe body.

15. The injection device as claimed in claim 14, wherein the first abutment structure and the second abutment structure are curved, inclined, wavy, or threaded structures.

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