Holding device for storage container of needleless injector, needleless injector and needleless injector system

Abstract

The utility model provides a retaining device for a storage container of a needleless injector, the storage container can be removably installed in the needleless injector, the retaining device is configured to be capable of switching between a locking state and an unlocking state, in the locking state, the retaining device can prevent the storage container from being removed from an injector main body, and in the unlocking state, the retaining device can prevent the storage container from being removed from the injector main body. The holding device is configured to be capable of being elastically deformed in response to an unlocking operation of an operator, so that the holding device can be switched from the locking state to the unlocking state. A needleless injector and a needleless injector system are also provided. According to the holding device and the needleless injector, the built-in medicine storage bottle does not need to be assembled and disassembled along with the injection head assembly, the built-in medicine storage bottle can be easily taken and placed, and convenience is provided for an operator to use the needleless injector.

Description

Technical Field

[0001] This invention relates to medical devices for injecting substances, particularly needle-free injectors for injecting liquid medications. More specifically, this invention relates to a holding device for a storage container of a needle-free injector, a needle-free injector, and a needle-free injector system. Background Technology

[0002] In medical settings, using a needle-free injector typically involves first attaching the tubing containing the medication to the injector body. The medication is then drawn from a separately placed reservoir through the distal end of the tubing. After drawing, the distal end of the tubing must be separated from the reservoir before injection. This type of injector has a complex operating procedure and requires a high level of skill. It is usually operated by medical professionals and is not suitable for home use by the general public.

[0003] To address this issue, the existing solution involves improving the syringe structure and replacing the traditional external reservoir with an internal one, allowing it to be housed within the syringe body. During operation, the medication is first drawn in through the movement of a piston rod within the tubing. The medication is then drawn from the reservoir within the syringe body through the proximal end of the tubing into the receiving cavity, completing the injection process.

[0004] However, this type of built-in reservoir can usually only be installed into or removed from the syringe body along with the injection head, including the tubing and piston rod. When the reservoir needs to be removed and replaced, it is difficult for the operator to remove the reservoir from the syringe body independently and flexibly, making it difficult to change the medication.

[0005] Therefore, there is a need to provide a holding device for the drug reservoir to improve existing needle-free injectors, so that the drug reservoir can be freely removed from the injector body without having to be removed along with the injection head, thereby at least partially solving the above-mentioned problems of existing needle-free injectors. Utility Model Content

[0006] To overcome the aforementioned drawbacks of the prior art and facilitate the free removal of the built-in reservoir in a needle-free injector, according to one aspect of the present invention, a retaining device for a storage container of a needle-free injector is provided, the storage container being removably mounted in the needle-free injector, wherein the retaining device is configured to switch between a locked state and an unlocked state, wherein in the locked state, the retaining device prevents the storage container from being removed from the injector body, and in the unlocked state, the retaining device allows the storage container to be removed from the injector body, and wherein the retaining device is configured to elastically deform in response to an operator's unlocking operation, thereby being able to switch from the locked state to the unlocked state.

[0007] In some preferred embodiments, the retaining device includes a collar configured to fit over the distal portion of the storage container.

[0008] In some preferred embodiments, the collar includes: a limiting portion fitted onto the head of the storage container at its distal end and abutting against a shoulder formed between the head and the body of the storage container, for preventing the storage container from moving distally in the axial direction from the opening of the collar; and a locking portion configured to be engaged with a first internal push rod within the outer housing of the syringe body when the retaining device is in a locked state, to prevent the collar from moving distally in the axial direction.

[0009] In some preferred embodiments, the limiting portion includes an annular piece extending proximally in the axial direction from the annular base of the collar, the proximally end of the annular piece being able to abut against the shoulder of the storage container, and the engaging portion includes a spring piece extending proximally in the axial direction and outward in the radial direction from the base of the collar, the free end of the spring piece away from the base being provided with a claw extending radially outward and axially distally, the claw being configured to be engaged with an annular groove formed in the inner wall surface of the first inner push rod when the retaining device is in the locked state.

[0010] In some preferred embodiments, the collar includes a plurality of ring pieces and a plurality of spring pieces arranged at intervals along the circumferential direction.

[0011] In some preferred embodiments, the annular grooves formed in the inner wall surface of the first inner push rod are either continuously extending or intermittently extending in correspondence with the circumferential positions of the plurality of spring pieces.

[0012] In some preferred embodiments, when an operator operates to unlock the retaining device, the spring is biased radially inward by an unlocking force, causing the spring's pawl to disengage from the annular groove of the first internal push rod, thereby switching the retaining device to the unlocked state.

[0013] According to another aspect of the present invention, a needle-free injector is provided, the needle-free injector comprising an injector body and a storage container, the storage container being removably mounted in the injector body, wherein the needle-free injector further comprises a retaining device according to any one of the foregoing technical solutions, wherein the retaining device is configured to prevent the storage container from being removed from the injector body in a locked state and to allow the storage container to be removed from the injector body in an unlocked state, and wherein the retaining device is configured to elastically deform in response to an unlocking operation by an operator, thereby being able to switch from the locked state to the unlocked state.

[0014] In some preferred embodiments, the storage container is a cartridge bottle, and the distal portion of the storage container includes: a head located at the distal end; and a body portion located proximal to the head, wherein a shoulder portion is formed between the head and the body portion.

[0015] In some preferred embodiments, the syringe body further includes a resilient biasing mechanism disposed at the proximal end of the storage container, wherein the resilient biasing mechanism is configured to bias the storage container distally such that when the retaining device is unlocked, the resilient biasing mechanism can push the storage container and the retaining device distally out of the syringe body.

[0016] According to another aspect of the present invention, a needleless injector system is provided, the needleless injector system comprising: a needleless injector according to any one of the foregoing technical solutions; and a separate unlocking device disposed independently of the needleless injector.

[0017] In some preferred embodiments, the unlocking device is a sleeve configured to be operated by an operator to engage the retaining device, causing the retaining device to elastically deform to switch from the locked state to the unlocked state.

[0018] In some preferred embodiments, the retaining device includes a collar with a spring extending proximally in the axial direction and radially outward from the base of the collar. The free end of the spring, away from the base, is provided with a pawl extending radially outward and axially distally. The pawl is configured to engage with an annular groove in the inner wall surface of a first internal push rod within the outer housing of the syringe body when the retaining device is locked. When an operator operates the sleeve to move proximally in the axial direction to be fitted radially outward from the collar, the sleeve can bias the spring radially inward, causing the pawl of the spring to disengage from the annular groove of the first internal push rod, thereby unlocking the retaining device.

[0019] With the holding device and needleless injector according to this invention, the built-in drug reservoir can be held in the injector and can be freely removed from the injector without being installed and disassembled along with the injection head assembly, thus enabling easy placement and removal of the built-in drug reservoir and providing convenience for the operator to use the needleless injector. Attached Figure Description

[0020] To better understand the above and other objects, features, advantages, and functions of this utility model, reference can be made to the preferred embodiments shown in the accompanying drawings. The same or similar reference numerals in the drawings refer to the same or similar parts. Those skilled in the art should understand that the drawings are intended to schematically illustrate the preferred embodiments of this utility model and do not limit the scope of this utility model in any way; the parts in the drawings are not drawn to scale.

[0021] Figure 1 A perspective view of a needleless injector according to a preferred embodiment of the present invention is shown.

[0022] Figure 2 It shows Figure 1 An exploded view of the needle-free injector shown.

[0023] Figure 3 A perspective view of the holding device and the unlocking device according to a preferred embodiment of the present invention is shown.

[0024] Figure 4 A schematic diagram is shown showing the retaining device according to a preferred embodiment of the present invention with its collar fitted onto the distal portion of the storage container.

[0025] Figure 5 A perspective view of the retaining device collar according to a preferred embodiment of the present invention is shown.

[0026] Figure 6A perspective view of the distal portion of the first internal plunger of a syringe body according to a preferred embodiment of the present invention is shown.

[0027] Figure 7 A cross-sectional schematic diagram is shown showing the unlocking device and retaining device cooperating to unlock according to a preferred embodiment of the present invention. Detailed Implementation

[0028] The following will describe in detail, with reference to the accompanying drawings, the holding device for the storage container, the needleless injector, and the injector system according to the present invention. The embodiments given below are merely preferred embodiments of the present invention. Those skilled in the art can conceive of other ways to implement the present invention based on the preferred embodiments, and such other ways also fall within the scope of the present invention.

[0029] This invention provides a retaining device for a storage container that can be removably mounted in a needle-free syringe for use with the syringe. The retaining device is configured to switch between a locked state and an unlocked state. In the locked state, the retaining device prevents the storage container from being removed from the syringe body, and in the unlocked state, the retaining device allows the storage container to be removed from the syringe body. The retaining device is also configured to be unlocked by an unlocking device to switch from the locked state to the unlocked state.

[0030] To better describe the holding device according to this utility model and for ease of understanding, the overall structure of the needleless syringe will be introduced first.

[0031] First, it should be noted that the directional and positional terms mentioned in this utility model should be understood as relative directions and relative positions. The directional and positional terms mentioned in this utility model can be understood with reference to the accompanying drawings. For example, "axial direction" and "axial direction (X)" mentioned in this utility model can be understood as directions parallel or approximately parallel to the longitudinal central axis of the syringe, that is, along the XX direction in the accompanying drawings or parallel to the XX direction in the accompanying drawings; "radial direction," "radial direction," "up," "down," "circumferential direction," and "circumferential direction" mentioned in this utility model are all directions defined with respect to the XX axis. For example, the radial outer direction indicates a direction away from the longitudinal central axis of the syringe, the radial inner direction indicates a direction towards the longitudinal central axis of the syringe, up-down movement refers to back-and-forth movement along a specific radial direction, and the circumferential direction indicates a direction around the longitudinal central axis of the syringe; the "rotational direction" mentioned in this utility model can be understood as a direction of rotation around the XX axis, which is approximately equivalent to the "circumferential direction." The terms "near," "proximal," "proximal end," "proximal direction," "rear," "rear side," "rear end," and "rear direction" mentioned in this utility model refer to directions close to the operator's hand along the axis XX or parallel to the axis XX (considering the operator holding the syringe to draw and inject the medicine); the terms "distal," "distal end," "distal direction," "front," "front side," "front end," and "front direction" mentioned in this utility model refer to directions away from the operator's hand along the axis XX or parallel to the axis XX, and also refer to the direction in which the substance to be injected is ejected during the injection step.

[0032] Overall structure

[0033] Figure 1 An overall perspective view of a syringe according to some preferred embodiments of the present invention is shown. Figure 2 It shows Figure 1 An exploded view of the syringe. The syringe in this embodiment is a needle-free syringe. Unlike traditional needle-based syringes, needle-free syringes do not inject through a needle. Instead, a micro-orifice is provided at the distal end of the injection head. During injection, the substance to be injected is rapidly ejected through this micro-orifice and injected into the patient's body. It should be noted that this description uses pharmaceuticals, liquids, and other injectable substances as examples to illustrate the concept of this invention; however, this is merely an example and not intended to be limiting. The substance to be injected can be of various other types, such as saline solution, glucose, or solid microparticles. Any substance that can be injected into the human body by the needle-free syringe of this invention falls within the protection scope of this invention. This invention does not limit the form or type of the substance to be injected.

[0034] refer to Figures 1 to 2According to this preferred embodiment, the syringe 1 includes the following components: an injection head 2, a syringe body 3, and a storage container 4. Each component can be packaged separately before use and then assembled together for use.

[0035] The injection head 2 includes: a drug tube 21 for containing the liquid medicine to be injected drawn from the storage container 4; an end cap 23 removably engaging with the distal portion of the drug tube to keep the drug tube sealed during the aspiration process described below, thereby sealing the injection micro-orifice at the distal end of the drug tube, and being removed during injection to expose the injection micro-orifice; and a piston rod 22 movable axially (X) relative to the drug tube 21 within the drug tube 21 to draw the liquid medicine from the storage container 4 into the drug tube during aspiration, and to eject the liquid medicine to be injected from the drug tube 21 through the injection micro-orifice during injection, thereby spraying the liquid medicine through the micro-orifice to complete the injection. The storage container 4 can be, for example, a cartridge bottle according to national standards. The storage container 4 according to this invention is built-in and can be removably installed into the syringe 1 (specifically, into the syringe body 3) for use with the syringe body 3 and the injection head 2.

[0036] The syringe body 3 includes an outer shell 32, a rear shell 31, and a first internal plunger 33. Figure 2 The first internal push rod shown is merely schematic; the specific structure of the first internal push rod, especially its mating structure with the retaining device described later, is as follows. Figure 3 and Figure 6 (Seen in the figure and described in detail below), and a second internal push rod 34. The outer housing 31 houses various components within the syringe body and has external threads at its proximal end for engagement with internal threads at the distal end of the rear housing 31, allowing the operator to perform axial relative movement between the two by rotating either the rear housing 31 or the outer housing 32. Reference Figure 2 The outer housing 32 houses a first internal push rod 33 and a second internal push rod 34 located near the first internal push rod. The first internal push rod 33 is used to accommodate the storage container 4 to carry the storage container and drive its movement during operation. The two internal push rods 33 and 34 are fixed to each other (e.g., by threaded engagement) and can be locked or unlocked with the rear housing 31 by engaging a locking member (not shown) located near the second internal push rod 34 with a locking mechanism 35 (which is fixedly mounted on the rear housing 31).

[0037] The injection head 2 can be removably mounted to the syringe body 3. Specifically, the drug tube 21 of the injection head 2 can be fixedly mounted to the outer housing 32, for example, by the engagement between the external thread of the proximal portion of the drug tube 21 and the internal thread of the outer housing 32 near the distal opening. Throughout the operation after fixed mounting, the drug tube 21 remains fixed to the outer housing 32, and the movement of the drug tube 21 is driven by the outer housing 32, with no relative movement between the two. The piston rod 22 of the injection head 2 can be fixedly mounted to the aforementioned first internal push rod 33 or to other components fixedly connected to the first internal push rod 33. For example, the proximal end of the piston rod 22 may include an elastic snap-fit ​​portion extending proximally in the axial direction X, which can be fixed to the distal portion of the first internal push rod or to other components fixed to the first internal push rod, so that throughout the operation after fixed mounting, the piston rod 22 remains relatively fixed to the first internal push rod 33, and the piston rod 22 is driven to move in the axial direction by the first internal push rod 33.

[0038] The operation process of the syringe according to this utility model after installation mainly includes the following steps: pressurization and energy storage step, drug intake step, air exhaust step, and injection step.

[0039] First, in the pressurization and energy storage step, initially, the actuation spring 39 located proximally between the outer housing 32 and the rear housing 31 is in an extended state, causing the outer housing 32 to be positioned distally relative to the rear housing 31. When pressurization and energy storage begin, the operator rotates the outer housing 32 proximally relative to the rear housing 31 (achieved through a threaded engagement between the two). During this process, the distal portion of the outer housing 32 applies force to the distal portion of the first internal push rod 33, thereby simultaneously moving the first internal push rod 33 and the second internal push rod 34 proximally. When the outer housing 32 is threadedly tightened relative to the rear housing 31, a locking member (not shown) proximally to the second internal push rod 34 locks into place with the locking mechanism 35, thereby locking the first and second internal push rods 33 and 34 to the rear housing 31. During this process, the actuation spring 39 is compressed and stores energy in preparation for the final injection step.

[0040] Following the pressurization and energy storage step is the drug aspiration step. During this step, the operator rotates the outer housing 32 to move it distally relative to the rear housing 31 (still achieved through the threaded engagement between the two). At this time, the first and second internal push rods 33 and 34 are locked by the locking mechanism 35 and thus remain fixed relative to the rear housing 31. In other words, during this process, the outer housing 32 moves distally relative to the first and second internal push rods 33 and 34. Since the drug tube 21 is fixed relative to the outer housing 32, and the storage container 4 and piston rod 22 are fixed relative to the first internal push rod 33, the drug tube 21 moves distally relative to the storage container 4 and piston rod 22. Furthermore, since the injection orifice at the distal end of the drug tube 21 is closed by the cap 23 (for example, the cap 23 is provided with a sealing gasket for sealing the injection orifice when it is closed on the drug tube 21), when the drug tube 21 moves distally relative to the piston rod 22, the distal portion of the inner cavity of the drug tube 21 (i.e., the chamber located between the distal end of the piston rod and the distal end of the drug tube) forms a receiving cavity. The pressure in the receiving cavity is relatively low, so the liquid in the storage container 4 can be drawn into the receiving cavity through the needle 24 contained in the drug liquid channel in the piston rod 22, thereby completing the drug aspiration.

[0041] Following the drug intake step is the venting step, a pre-injection preparation step designed to remove any gas that may have entered the drug delivery tube 21 before injection. In this step, the cap 23 is first removed, exposing the injection micro-orifice at the distal end of the drug delivery tube 21. Then, the outer housing 32 is rotated so that it moves slightly rearward relative to the rear housing 31. During this process, the locking mechanism 35 remains locked, keeping the first internal push rod 33 and the piston rod 22 fixed relative to the rear housing 31. Thus, the drug delivery tube 21 (fixed relative to the outer housing 32) moves slightly proximally relative to the piston rod 22 (fixed relative to the first internal push rod 33), and the piston rod 22 slightly compresses the receiving cavity within the drug delivery tube 21, allowing the gas within the cavity to be expelled from the injection micro-orifice under pressure.

[0042] Finally, the injection step. In this step, the outer housing 32 and the drug tube 21 are fixed relative to the rear housing 31. The operator operates the locking mechanism 35 (e.g., presses the button 351 on the proximal end of the syringe) to release it from the locking state between it and the locking member (not shown) located near the first and second internal push rods. This allows the second internal push rod 34, the first internal push rod 33, the storage container 4, and the piston rod 22 to move rapidly distally relative to the rear housing 31 under the return action of the actuation spring 39, thereby completing the injection by rapidly squeezing the liquid in the receiving cavity of the drug tube 21 through the piston rod 22.

[0043] Holding device

[0044] For the syringe described above, after the injection step is completed, the operator can disassemble the syringe components for easy storage.

[0045] Typically, as described above, the built-in storage container 4 can only be installed into or removed from the syringe body 3 along with the injection head 2, including the tubing 21 and piston rod 22; the storage container 4 cannot be disassembled independently. When it is necessary to disassemble or replace the storage container, it is difficult for the operator to flexibly and independently handle the storage bottle, causing inconvenience such as difficulty in changing medication.

[0046] To at least partially solve the above-mentioned problems, the present invention provides a retaining device that facilitates the replacement of the storage container 4. This retaining device is configured to switch between a locked state and an unlocked state. In the locked state, the retaining device prevents the storage container 4 from being removed from the syringe body 3, and in the unlocked state, the retaining device allows the storage container 4 to be removed from the syringe body 3. The retaining device is configured to elastically deform in response to an operator's unlocking operation, thereby enabling it to switch from the locked state to the unlocked state. The retaining device according to the present invention will be described in detail below.

[0047] First, it should be noted that during the removal of the storage container 4 discussed below, the injection head 2 is not mounted on the syringe body 3, thus not obstructing the installation and removal of the storage container 4. For example, in the removal step, the operator first removes the injection head 2 from the syringe body 3, thereby no longer blocking the distal opening of the outer housing 32 and the distal opening of the first internal push rod 33. Then, the holding device 5 is switched to the unlocked state, and the storage container 4 is removed from the first internal push rod 33 in the distal direction within the outer housing 32 through the aforementioned distal opening of the outer housing 32 and the distal opening of the first internal push rod 33.

[0048] Next reference Figures 3 to 7 The retaining device is described in detail below. According to this invention, the retaining device is configured to switch between a locked state and an unlocked state. In the locked state, the retaining device prevents the storage container 4 from being removed from the syringe body 3, and in the unlocked state, the retaining device allows the storage container 4 to be removed from the syringe body 3. The retaining device is also configured to be unlocked by an unlocking device 6 to switch from the locked state to the unlocked state.

[0049] The retaining device according to this utility model includes a collar 5, which is configured to fit over the distal portion of the storage container 4. When the operator installs the storage container 4, the collar 5 can be first fitted over the distal portion of the storage container, and then both can be installed proximally into the internal cavity of the first internal push rod 33 through the distal opening of the outer housing 32 and the distal opening of the first internal push rod 33; or the storage container 4 can be installed proximally into the internal cavity of the first internal push rod 33, and then the collar 5 can be fitted proximally between the distal portion of the storage container and the distal portion of the first internal push rod. In the locked state, the collar 5 prevents the storage container 4 from being removed from the distal opening of the first internal push rod 33. When unlocked using the unlocking device, the operator can remove the unlocked collar along with the storage container proximally through the distal opening of the outer housing 32 and the distal opening of the first internal push rod 33; or the collar 5 can be removed proximally first, after which the storage container can be freely removed proximally.

[0050] Further, refer to Figures 4 to 5 The storage container 4 may be a built-in cartridge bottle, and the distal portion of the storage container 4 includes: a head 41 located at the distal end; and a body portion 42 located proximal to the head 41, with a shoulder 43 formed between the head 41 and the body portion 42. The collar 5 includes: a limiting portion that is fitted around the outer periphery of the head 41 of the storage container and abuts against the shoulder 43 formed between the head and the body portion 42 of the storage container, for preventing the storage container 4 from moving distally in the axial direction X from the opening 53 of the collar 5; and a locking portion that is configured to be locked into a first internal push rod 33 within the outer housing 32 of the syringe body 3 when the device is in a locked state, to prevent the collar 5 from moving distally in the axial direction X.

[0051] Specifically, the limiting portion of the collar 5 includes an annular piece 51 extending proximally from the annular base 54 of the collar 5 along the axial direction X. The proximally end of the annular piece 51 can abut against the shoulder 43 of the storage container. The engaging portion includes a spring piece 52 extending proximally in the axial direction X and radially outward from the base 54 of the collar 5. The free end of the spring piece away from the base 54 is provided with a pawl 521 extending radially outward and axially distally. The pawl 521 is configured to engage with an annular groove 331 (e.g., when the device is in a locked state) formed in the inner wall surface of the first inner push rod 33. Figure 6(As shown). When the operator needs to install the retaining device, the collar 5 can be pushed toward the first internal push rod, either alone or together with the storage container. During the pushing process, before the pawl 521 is engaged by the annular groove 331, the spring piece 52 is radially biased inward by the inner wall surface of the first internal push rod 33 located on the far side of the annular groove 331. When the collar moves toward the near side until the pawl 521 reaches the position of the annular groove 331, the spring piece rebounds in the radially outward direction, causing the barbed pawl to hook into the shape-fitting annular groove 331, thereby locking the retaining device.

[0052] Preferably, to ensure the snap-fit ​​strength and the reliability of the collar's positioning of the storage container, the collar 5 includes a plurality of annular pieces 51 and a plurality of spring pieces 52 arranged at intervals along the circumferential direction. The annular groove 331 opened in the inner wall surface of the first internal push rod 33 is a continuously extending groove, or a discontinuously extending groove corresponding to the circumferential positions of the plurality of spring pieces 52.

[0053] refer to Figure 3 and Figure 7 According to a preferred embodiment of the present invention, the unlocking device is a separate sleeve 6, independent of the syringe 1. This sleeve 6 acts as a "key," allowing the operator to move the sleeve 6 proximally in the axial direction when it is necessary to unlock the retaining device from the syringe body to allow removal of the storage container. Figure 3 (As shown by the arrow near the sleeve 6) it is fitted onto the radially outer side of the collar 5. At this time, the sleeve 6 can bias the spring piece 52 radially inward (the engagement state between the sleeve 6 and the collar 5 is as follows). Figure 7 As shown, this causes the claw 521 of the spring 52 to disengage from the annular groove 331 of the first internal push rod 33, thereby unlocking the retaining device. After unlocking, the storage container and collar 5 can be freely removed from the syringe body. For example, a resilient biasing mechanism (not shown) is provided at the proximal end of the storage container, which, after the retaining device is unlocked, can push the storage container and collar 5 distally outward from the first internal push rod 33 and the outer housing 32.

[0054] This invention also provides a needle-free injector, which includes an injector body 3 and a storage container 4. The storage container 4 can be removably installed in the injector body 3. The needle-free injector also includes the aforementioned retaining device, which is configured to prevent the storage container 4 from being removed from the injector body 3 in a locked state and to allow the storage container 4 to be removed from the injector body 3 in an unlocked state. The retaining device is configured to elastically deform in response to an unlocking operation by an operator, thereby being able to switch from the locked state to the unlocked state.

[0055] This utility model also provides a needleless injector system, which includes the aforementioned needleless injector 1 and a separate unlocking device independent of the needleless injector 1.

[0056] It should be noted that the above-described embodiments of this utility model can be combined and / or modified in various ways, and the results of such combinations and / or modifications should also be considered as embodiments of this utility model. The above description of various embodiments of this utility model is provided for descriptive purposes to a person skilled in the art. It is not intended to exclude or limit this utility model to a single disclosed embodiment. As taught above, a person skilled in the art will understand that various alternatives and variations of this utility model are possible. Therefore, although some alternative embodiments have been specifically described, a person skilled in the art will understand or relatively easily develop other embodiments. This utility model is intended to include all alternatives, modifications, and variations of the utility model described herein, as well as other embodiments falling within the spirit and scope of the utility model described above.

Claims

1. A retaining device for a storage container (4) of a needleless injector, the storage container being removably mounted in the needleless injector (1), characterized in that, The retaining device is configured to switch between a locked state and an unlocked state, wherein in the locked state, the retaining device prevents the storage container (4) from being removed from the syringe body (3), and in the unlocked state, the retaining device allows the storage container (4) to be removed from the syringe body (3). The retaining device is configured to elastically deform in response to an operator's unlocking operation, thereby enabling it to be switched from the locked state to the unlocked state.

2. The holding device according to claim 1, characterized in that, The retaining device includes a collar (5) configured to fit over the distal portion of the storage container (4).

3. The holding device according to claim 2, characterized in that, The collar (5) includes: A limiting portion, which is fitted onto the head (41) at the distal end of the storage container and abuts against a shoulder (43) formed between the head and the main body (42) of the storage container, is provided to prevent the storage container (4) from moving distally in the axial direction (X) from the opening (53) of the collar (5); and The locking part is configured to be engaged with a first internal push rod (33) inside the outer housing (32) of the syringe body (3) when the retaining device is in the locked state, so as to prevent the collar (5) from moving distally in the axial direction (X).

4. The holding device according to claim 3, characterized in that, The limiting portion includes an annular piece (51) extending proximally from the annular base (54) of the collar (5) in the axial direction (X), the proximally end of the annular piece (51) being able to abut against the shoulder (43) of the storage container, and The engaging portion includes a spring piece (52) extending from the base (54) of the collar (5) toward the proximal side in the axial direction (X) and the outer side in the radial direction. The free end of the spring piece away from the base (54) is provided with a claw (521) extending toward the radially outer side and the axially distal side. The claw (521) is configured to engage with an annular groove (331) opened in the inner wall surface of the first inner push rod (33) when the retaining device is in the locked state.

5. The holding device according to claim 4, characterized in that, The collar (5) includes a plurality of ring pieces (51) and a plurality of spring pieces (52) arranged at intervals along the circumferential direction.

6. The holding device according to claim 5, characterized in that, The annular grooves opened in the inner wall surface of the first internal push rod (33) are either continuously extending or intermittently extending in correspondence with the circumferential positions of the plurality of spring pieces (52).

7. The holding device according to any one of claims 4 to 6, characterized in that, When the operator operates to unlock the retaining device, the spring (52) is biased radially inward by the unlocking force, causing the pawl (521) of the spring to disengage from the annular groove (331) of the first internal push rod (33) to switch the retaining device to the unlocked state.

8. A needle-free injector (1), the needle-free injector comprising an injector body (3) and a storage container (4), the storage container being removably mounted in the injector body (3), Its features are, The needleless injector further includes a retaining device according to any one of claims 1-7, wherein the retaining device is configured to prevent the storage container (4) from being removed from the injector body (3) in a locked state, and to allow the storage container (4) to be removed from the injector body (3) in the unlocked state. The retaining device is configured to elastically deform in response to an operator's unlocking operation, thereby enabling it to be switched from the locked state to the unlocked state.

9. The needleless injector according to claim 8, characterized in that, The storage container (4) is a cartridge bottle, and the distal portion of the storage container (4) includes: The head (41) located at the distal end; and A main body portion (42) located near the head (41), wherein a shoulder portion (43) is formed between the head (41) and the main body portion (42).

10. The needleless injector according to claim 8, characterized in that, The syringe body (3) also includes an elastic biasing mechanism disposed at the proximal end of the storage container (4). The elastic biasing mechanism is configured to bias the storage container distally, such that when the retaining device is unlocked, the elastic biasing mechanism can push the storage container (4) and the retaining device distally out of the syringe body (3).

11. A needle-free injector system, characterized in that, The needleless injector system includes: a needleless injector (1) according to any one of claims 8-10; and a separate unlocking device provided independently of the needleless injector (1).

12. The syringe system according to claim 11, characterized in that, The unlocking device is a sleeve (6) configured to be operated by an operator to engage the retaining device, causing the retaining device to elastically deform to be switched from the locked state to the unlocked state.

13. The syringe system according to claim 12, characterized in that, The retaining device includes a collar (5) comprising a spring (52) extending from the base (54) of the collar proximal in the axial direction (X) and radially outward. The free end of the spring, away from the base (54), is provided with a pawl (521) extending radially outward and axially distal. The pawl (521) is configured to engage with an annular groove (331) formed in the inner wall surface of the first internal push rod (33) within the outer housing (32) of the syringe body (3) when the retaining device is locked. When the operator operates the sleeve (6) to move the sleeve (6) axially toward the proximal side to the radial outer side of the collar (5), the sleeve (6) can bias the spring piece (52) radially inward, so that the claw (521) of the spring piece (52) disengages from the annular groove (331) of the first internal push rod (33), thereby unlocking the retaining device.

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