Injection device and injection system comprising the injection device

Abstract

The present invention provides an injection device and an injection system, wherein the injection device and an injection head assembly are used in combination. The injection device includes a housing, a push rod, and an injection head fixing structure. The housing has an opening. The push rod is movably arranged in the housing, and the push rod is configured to engage with the piston assembly. The injection head fixing structure is connected to the opening of the housing, and the injection head fixing structure includes a locking device, and the locking device is configured to move between a locking position and an unlocking position. When the locking device is in the locking position, the radial inner edge of the locking device forms a first passage in the injection head fixing structure, and when the locking device is in the unlocking position, the radial inner edge of the locking device forms a second passage in the injection head fixing structure through which the injection head body can pass, and the cross-sectional area of ​​the first passage is smaller than the cross-sectional area of ​​the second passage. According to the injection device of the above scheme, the injection head body can be locked more conveniently.

Description

Technical Field

[0001] The present invention relates to the field of medical instruments, and more particularly to an injection device capable of assisting an injection head assembly in sucking and injecting a drug solution, and an injection system comprising the injection device. Background Art

[0002] The injection device is usually provided with an injection body and a piston arranged in the injection body. When performing the injection operation, the position of the injection body needs to be fixed and the piston needs to be moved relative to the injection body. However, the existing fixing device has a complex structure and is inconvenient to operate, which affects the user experience.

[0003] Therefore, it is necessary to provide an injection device and an injection system including the injection device to at least partially solve the above problems. Summary of the invention

[0004] According to a first aspect of the present invention, there is provided an injection device for use with an injection head assembly, the injection head assembly comprising an injection head body and a piston assembly, the injection head body being provided with an injection cavity, the piston assembly being configured to be movable in the injection cavity, the injection device comprising:

[0005] a housing having an opening;

[0006] a push rod movably disposed in the housing, the push rod being configured to engage with the piston assembly; and

[0007] an injection head fixing structure connected to the opening of the housing, the injection head fixing structure comprising a locking device configured to be movable between a locked position and an unlocked position,

[0008] When the locking device is in the locking position, the radial inner edge of the locking device forms a first passage in the injection head fixing structure, and when the locking device is in the unlocking position, the radial inner edge of the locking device forms a second passage in the injection head fixing structure through which the injection head body can pass, and the cross-sectional area of ​​the first passage is smaller than the cross-sectional area of ​​the second passage.

[0009] Preferably, the injection device further comprises a driving device, wherein the driving device is connected to the locking device and is configured to drive the locking device to move.

[0010] Preferably, the driving device is constructed as an annular operating block, which is engaged to the opening portion of the shell, and the operating block is constructed to be able to rotate relative to the shell in a first direction and a second direction opposite to the first direction, wherein when the operating block rotates in the first direction, it can drive the locking device to the locked position, and when the operating block rotates in the second direction, it can drive the locking device to the unlocked position.

[0011] Preferably, the injection head fixing structure further comprises a transmission device, the transmission device is connected to the operating block and the locking device respectively, and the transmission device is configured to be able to change the orientation of the locking device when the operating block rotates.

[0012] Preferably, the locking device includes a locking block rotatably connected to the housing via a pivot, and the transmission device includes an external gear arranged on the outer periphery of the locking block and an internal gear arranged on the inner periphery of the operating block, the external gear meshing with the internal gear.

[0013] Preferably, the locking device comprises a plurality of locking blocks evenly spaced apart along a circumferential direction of the operating block.

[0014] Preferably, the locking block comprises a main body portion which is substantially in the shape of a rectangular parallelepiped and a dome portion connected to the main body portion, and the external gear is disposed on the dome portion.

[0015] Preferably, when the locking device is in the locking position, the locking block is arranged in a first orientation relative to the central axis of the operating block, and when the locking device is in the unlocking position, the locking block is arranged in a second orientation relative to the central axis, when the locking block is in the first orientation, the length direction of the main body is roughly consistent with the radial direction of the operating block, and when the locking block is in the second orientation, the width direction of the main body is roughly consistent with the radial direction of the operating block.

[0016] Preferably, the locking device includes a locking rod, and the transmission device includes a connecting rod, the first end of the locking rod is rotatably connected to the housing via a first rotating shaft, the second end of the locking rod is rotatably connected to the first end of the connecting rod via a second rotating shaft, and the second end of the connecting rod is rotatably connected to the operating block via a third rotating shaft.

[0017] Preferably, the inner circumference of the operating block is provided with a first boss portion at the third rotating shaft, and the side of the second end of the locking rod facing the operating block is provided with a second boss portion and a groove portion adjacent to the second boss portion, when the locking device is in the unlocking position, the locking rod is oriented so that the first boss portion engages in the groove portion, and when the locking device is in the locking position, the locking rod is oriented so that the first boss portion abuts against the second boss portion along the radial direction of the operating block.

[0018] Preferably, the locking device comprises a plurality of locking rods and a plurality of connecting rods corresponding to the number of the plurality of locking rods, each locking rod is substantially configured in an arc shape, and the plurality of locking rods abut against each other end to end in the circumferential direction of the operating block.

[0019] Preferably, the first end of the locking rod is provided with an arcuate convex portion, and the second end of the locking rod is provided with an arcuate concave portion, and when the locking device is in the locking position, the convex portion of the locking rod engages in the concave portion of another locking rod adjacent to the locking rod.

[0020] Preferably, the injection head fixing structure further comprises a torsion spring connected to the locking device, wherein the torsion spring is configured to apply a torsion force to the locking device so as to move the locking device from the unlocking position to the locking position.

[0021] Preferably, the injection device further comprises a limiting device, the limiting device having a limiting state and a released state, and the limiting device is configured to limit the operation block from rotating along the first direction in the limiting state.

[0022] Preferably, the inner circumference of the operating block is provided with a stop flange protruding radially inward, and the limiting device includes a limit block, which is connected to the opening portion of the shell and is arranged on the inner side of the operating block. When the limiting device is in the limiting state, the first end of the limit block abuts against the stop flange from one circumferential side of the stop flange, and when the limiting device is in the released state, the first end of the limit block can be away from the stop flange.

[0023] Preferably, the limiting block is rotatably connected to the opening portion of the housing via a fourth pivot, and the fourth pivot is disposed between a first end of the limiting block and a second end opposite to the first end.

[0024] Preferably, the limiting device further comprises an elastic member, and the elastic member is configured to act on the first end of the limiting block so that the first end abuts against the stop flange in the limiting state.

[0025] Preferably, the injection device comprises a plurality of limiting devices arranged at intervals along the circumferential direction of the housing.

[0026] The present invention also provides an injection system, comprising:

[0027] An injection head assembly, the injection head assembly comprising an injection head body and a piston assembly, the injection head body being provided with an injection cavity, the piston assembly being configured to be movable in the injection cavity; and

[0028] An injection device as described above.

[0029] Preferably, a recessed structure is provided on the outer periphery of the injection head body, and when the locking device is in the locking position, at least a portion of the radial inner edge of the locking device extends into the recessed structure.

[0030] According to the injection device and injection system of the present invention, the position of the injection head body can be conveniently locked and unlocked. The injection device according to this solution is more compact in design, and the installation and removal of the injection head assembly are simpler, which can improve loading and unloading efficiency and reduce costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to better understand the above and other purposes, features, advantages and functions of the present invention, reference may be made to the preferred embodiments shown in the accompanying drawings. The same or similar reference numerals in the accompanying drawings refer to the same or similar components. It should be understood by those skilled in the art that the accompanying drawings are intended to schematically illustrate the preferred embodiments of the present invention and have no limiting effect on the scope of the present invention, and the components in the drawings are not drawn to scale.

[0032] Figure 1 is a three-dimensional schematic diagram of an injection system according to a preferred embodiment of the present invention, wherein the injection head assembly and the injection device are in a separated state;

[0033] Figure 2 for Figure 1 An exploded schematic diagram of an injection device of an injection system in FIG.

[0034] Figure 3 for Figure 2 A further exploded schematic diagram of the injection device in FIG.

[0035] Figure 4 for Figure 1 A schematic cross-sectional view of an injection device of an injection system;

[0036] Figure 5 for Figure 1 The injection equipment in Figure 4 Schematic diagram of a partial cross section taken along line AA;

[0037] Figure 6 for Figure 1 The injection equipment in Figure 4 Schematic diagram of a partial cross section taken along line BB in FIG.

[0038] Figure 7 for Figure 6 A local enlarged schematic diagram of the M part in FIG.

[0039] Figure 8 for Figure 1 The injection equipment in Figure 4 A schematic diagram of a partial cross section taken along the CC line in FIG.

[0040] Fig. 9 for Figure 1 A three-dimensional schematic diagram of an injection system in which an injection head assembly is assembled to an injection device;

[0041] Fig.10 for Fig. 9 A cross-sectional schematic diagram of the injection system shown in;

[0042] Fig.11 for Fig. 9 A three-dimensional schematic diagram of the injection system shown in FIG. 1 after the first end cap is removed;

[0043] Fig.12 for Fig.11 A perspective schematic diagram of the injection system shown in FIG. 1 after the locking device is removed;

[0044] Fig.13 for Fig.12 A local enlarged schematic diagram of the N part in FIG.

[0045] Fig.14 and Fig.15 They are Fig. 9 A partial cross-sectional schematic diagram of the injection system shown in FIG. 1 when the injection device starts to draw liquid medicine and during the process of drawing liquid medicine;

[0046] Fig.16 for Fig. 9 A partial cross-sectional schematic diagram of the injection system shown in FIG. 1 when the position of the push rod is locked;

[0047] Fig.17 for Fig. 9 A partial cross-sectional schematic diagram of the injection system shown in FIG. 1 when the push rod is in an unlocked position;

[0048] Fig.18 for Fig. 9 A partial cross-sectional schematic diagram of the injection system shown in FIG. 1 when the injection device performs an injection operation;

[0049] Fig.19 for Fig. 9 A partial cross-sectional schematic diagram of the injection system shown in FIG. 1 after the injection is completed and the drive device has been rotated to the initial position, at which time the injection head assembly has not yet been ejected;

[0050] Fig. 20 for Fig.19 A partial cross-sectional schematic diagram of the injection system when cut along line A'-A';

[0051] Fig.21 for Fig.19 A partial cross-sectional schematic diagram of the injection system when cut along line B'-B';

[0052] Fig. 22 for Fig.19 A partial cross-sectional schematic diagram of the injection system when cut along the C'-C' line;

[0053] Fig.23 for Fig.19 A partial cross-sectional schematic diagram of the injection system shown in FIG. 1 when the injection head assembly has been ejected to the outside of the housing by the ejection device;

[0054] Fig.24 for Fig.23 A partial cross-sectional schematic diagram of the injection system when cut along line A"-A";

[0055] Fig.25 for Fig.23 A partial cross-sectional schematic diagram of the injection system when cut along the B"-B" line;

[0056] Figure 26-Figure 28 Schematic diagrams of the injection head fixing structure of the injection device when the locking device is in different states according to a preferred embodiment of the present invention are respectively shown;

[0057] Figure 29-Figure 32 Schematic diagrams of the injection head fixing structure of the injection device according to the second preferred embodiment of the present invention are respectively shown when the locking device is in different states;

[0058] Fig.33 A schematic cross-sectional view showing an injection device according to a third preferred embodiment of the present invention; and

[0059] Fig.34 for Fig.33 The injection device shown in FIG. 1 is a schematic cross-sectional view after the injection head assembly is assembled. DETAILED DESCRIPTION

[0060] Now, with reference to the accompanying drawings, the specific embodiments of the present invention are described in detail. What is described here is only the preferred embodiment of the present invention, and those skilled in the art can think of other ways to implement the present invention based on the preferred embodiment, and the other ways also fall within the scope of the present invention.

[0061] The present invention provides an injection device and an injection system including the injection device. First of all, it should be noted that the directional terms and positional terms mentioned in the present invention should be understood as relative directions and relative positions. The directional terms and positional terms mentioned in the present invention can be understood with reference to the accompanying drawings. For example, the "axial direction" and "axial direction" mentioned in the present invention can be understood as the direction along the attached drawings. Figure 4 XX direction or parallel to the attached Figure 4 The XX direction in the present invention; the “radial direction”, “radial direction”, “circumferential direction”, “circumferential direction”, etc. mentioned in the present invention are all directions about the XX axis; the “rotational direction” mentioned in the present invention can be understood as the direction of rotation around the XX axis, which is roughly equivalent to the “circumferential direction”.

[0062] Figure 1-Figure 34 The injection device according to some preferred embodiments of the present invention and the injection system including the injection device are shown. The injection device according to the preferred embodiment of the present invention can be used in conjunction with an injection head assembly to assist the injection head assembly in extracting and injecting a liquid medicine. Figure 1-Figure 34 The injection head assembly shown in the figure is a needle-free injection head assembly, but it can be understood that the present invention can also be applied to a needle injection head assembly. The injection device according to the preferred embodiment of the present invention can accurately suck the liquid to be injected into the injection cavity in the injection head body (i.e., the drug suction step to be described later), and can realize the injection operation of the liquid to be injected.

[0063] The injection device according to the preferred embodiment of the present invention can be used in conjunction with an injection head assembly, and the injection device and the injection head assembly together constitute an injection system.

[0064] Implementation Method 1

[0065] References below Figure 1-Figure 28 The injection device 2 and the injection system 1 according to the first preferred embodiment of the present invention are described in detail.

[0066] In a preferred embodiment, Figure 1As shown, the injection head assembly 3 includes an injection head body 4, a drug storage body 5 and a piston assembly 6. The drug storage body 5 is roughly cylindrical in shape, and one end of the drug storage body 5 has an opening for a drug storage bottle to be placed therein. One end of the piston assembly 6 is connected to the drug storage body 5, and the other end extends to the inside of the injection head body 4. The injection head body 4 is roughly cylindrical in shape, and has an injection cavity 7 inside it. The end of the injection head body 4 is provided with an injection micropore 8 connecting the injection cavity 7 and the outside. The piston assembly 6 is provided with a channel that can connect the drug storage body 5 and the injection cavity 7. When the drug suction operation is intended, the drug storage body 5 connected with the piston assembly 6 can be moved relative to the injection head body 4 in a direction away from the injection micropore 8, so that the drug liquid in the drug storage body 5 enters the injection cavity through the channel in the piston assembly 6. When the injection operation is intended, the injection head body 4 can be pressed on the injection site, such as the patient's skin, to trigger the drug storage body 5 connected with the piston assembly 6 to move in the direction toward the injection micropore 8, so that the drug liquid in the injection cavity can be injected into the patient's body through the injection micropore 8.

[0067] like Figure 1-Figure 4 As shown, the injection device 2 generally includes a housing 9, a push rod 10, a coupling device 11, a driving device, an injection head fixing structure 13 and a push rod locking structure 14. The housing 9 is generally configured in a cylindrical shape, and has an opening portion 15 at one end, and an opening in the middle of the opening portion 15. The push rod 10 is also generally cylindrical in shape, and is movably disposed in the housing 9. The interior of the push rod 10 is a hollow structure, and at least a portion of the drug storage body 5 can enter the interior of the push rod 10 through the opening portion 15. Preferably, as Figure 4 As shown, in the assembled state, the central axis of the push rod 10 coincides with the central axis of the housing 9. Figure 4 The push rod 10 is configured to be able to move in a first position (eg, Fig.10 ) and a second position away from the opening 15 (as Fig.15 The push rod 10 moves between the first position and the second position in the housing 9, and when the push rod 10 moves from the first position to the second position in the housing 9, it can drive the medicine storage body 5 and the piston assembly 6 connected to the medicine storage body 5 to move synchronously to perform the medicine suction operation. When the push rod 10 moves from the second position to the first position in the housing 9, it can drive the medicine storage body 5 and the piston assembly 6 connected to the medicine storage body 5 to move synchronously to perform the injection operation. The coupling device 11 is mainly used to couple the medicine storage body 5 to the push rod 10 so that the medicine storage body 5 can move with the push rod 10. The injection head fixing structure 13 includes a locking device 16 for locking the injection head body 4 in a predetermined state. The driving device can be linked with both the locking device 16 and the coupling device 11 so that the locking device 16 and the coupling device 11 can act in response to the action of the driving device. The following describes each component in detail.

[0068] Injection head fixed structure

[0069] like Figure 1-Figure 3 As shown, the injection head fixing structure 13 is connected to the opening portion 15 of the housing 9. The injection head fixing structure 13 includes a locking device 16, and the locking device 16 has a locking position and an unlocking position. When the locking device 16 is in the locking position, the position of the injection head body 4 can be locked so that it cannot move. When the locking device 16 is in the unlocking position, it can be away from the injection head body 4, so that the injection head body 4 can move freely. Therefore, when the position of the injection head body 4 is locked, the drug storage body 5 and the piston assembly 6 connected to the drug storage body 5 can be moved relative to the injection head body 4 to perform a drug suction operation or an injection operation; when the position of the injection head body 4 is unlocked, the injection head body 4 can be taken out of the injection device 2.

[0070] like Fig.11 as well as Fig.28 As shown, when the locking device 16 is in the locked position, the radial inner edge of the locking device 16 forms a first passage in the injection head fixing structure 13, as shown in FIG. Figure 5 as well as Fig. 27 As shown, when the locking device 16 is in the unlocked position, the radial inner edge of the locking device 16 forms a second passage in the injection head fixing structure 13, and the cross-sectional area of ​​the first passage is smaller than the cross-sectional area of ​​the second passage. The cross-sectional area of ​​the second passage is larger than the outer diameter of the injection head body 4, and the cross-sectional area of ​​the first passage is smaller than the outer diameter of the injection head body 4, that is, the second passage is available for the injection head body 4 to pass through, and the first passage is configured so that the injection head body 4 cannot pass through. Thus, before the injection head assembly 3 is installed on the injection device 2, the locking device 16 can be placed in the unlocked position, and after the injection head assembly 3 is installed on the injection device 2, when the drug removal and / or injection operation is to be performed, the locking device 16 can be placed in the locked position. In addition, when the drug removal or injection operation is completed and the injection head assembly 3 is to be removed from the injection device 2, the locking device 16 also needs to be placed in the unlocked position.

[0071] In a preferred embodiment, the driving device is linked with the locking device 16 so that the locking device 16 can move in response to the action of the driving device. The driving device preferably has an initial position and a trigger position and can move between the initial position and the trigger position. When the driving device is in the initial position, the locking device 16 can be in the unlocking position accordingly, and when the driving device moves to the trigger position, the locking device 16 can move to the locking position in response to the triggering of the driving device.

[0072] Preferably, if Figure 1-Figure 3As shown, the driving device is configured as an annular operating block 12, which is sleeved on the opening 15 of the housing 9. Preferably, in the assembled state, the central axis of the operating block 12 coincides with the central axis of the push rod 10. The operating block 12 is configured to be rotatable relative to the housing 9 along a first direction and a second direction opposite to the first direction between an initial position and a trigger position. Fig.11 and Fig.12 As shown, the operating block 12 can rotate along the first direction D1 to the trigger position, and as shown in FIG. Fig. 20 and Fig.21 As shown, the operating block 12 can rotate along the second direction D2 to an initial position.

[0073] Preferably, the injection head fixing structure 13 further comprises a transmission device, which is respectively connected to the operating block 12 and the locking device 16, and the transmission device can transmit the action of the operating block 12 to the locking device 16, so that the locking device 16 can act in response to the action of the transmission device. Specifically, the transmission device is configured to change the orientation of the locking device 16 when the operating block 12 rotates, that is, the orientation of the locking device 16 is different when the drive device is in the initial position and the trigger position.

[0074] like Figure 2 , Figure 3 and Figure 5 As shown, in one embodiment, the locking device 16 includes a plurality of locking blocks 17, and the plurality of locking blocks 17 are evenly spaced along the circumferential direction of the operating block 12. Each locking block 17 is rotatably connected to the housing 9 via a pivot 18. Preferably, the transmission device includes an outer gear 19 arranged on the outer periphery of the locking block 17 and an inner gear 20 arranged on the inner periphery of the operating block 12, and the outer gear 19 is meshed with the inner gear 20. Thus, when the operating block 12 rotates, the rotational motion can be transmitted to the plurality of locking blocks 17 via the meshing of the outer gear 19 and the inner gear 20, so that the plurality of locking blocks 17 can also rotate synchronously accordingly, thereby realizing the change of their orientation. In the illustrated embodiment, the locking device 16 includes six locking blocks 17, and it can be understood that in other embodiments not shown, the locking device 16 can include other numbers of locking blocks 17, such as five or seven.

[0075] Preferably, if Figure 3 and Figure 5 As shown, the locking block 17 includes a main body 21 that is substantially in the shape of a rectangular parallelepiped and a dome portion 22 connected to the main body 21 . The external gear 19 is disposed on the periphery of the dome portion 22 . Preferably, a small number of external gears are also partially disposed on the periphery of the main body 21 .

[0076] like Fig.11 as well as Fig.28As shown, when the locking device 16 is in the locked position, the locking block 17 is arranged in a first orientation relative to the central axis of the operating block 12. When the locking block 17 is in the first orientation, the length direction of the main body 21 is roughly consistent with the radial direction of the operating block 12. In other words, the length direction of the main body 21 is arranged along the radial direction of the operating block 12, and the locking block 17 is in a "radially inwardly extending" state. At this time, the radial inner edge of the locking block 17 is closer to the central axis of the operating block 12, and the radial inner edges of the multiple locking blocks 17 form a first passage. Figure 5 as well as Fig. 27 As shown, when the locking device 16 is in the unlocked position, the locking block 17 is arranged in the second orientation relative to the central axis of the operating block 12, and when the locking block 17 is in the second orientation, the width direction of the main body 21 is substantially consistent with the radial direction of the operating block 12. In other words, the width direction of the main body 21 is arranged along the radial direction of the operating block 12, and the locking block 17 is in a "radially outwardly retracted" state. At this time, the radial inner edge of the locking block 17 is farther from the central axis of the operating block 12, and the radial inner edges of the plurality of locking blocks 17 form a second passage.

[0077] It should be noted that the radial inner edge when the locking block 17 is in the first orientation and the radial inner edge when the locking block 17 is in the second orientation are respectively relative to the current orientation of the locking block, that is, the radial inner edge when the locking block 17 is in the first orientation and the radial inner edge when the locking block 17 is in the second orientation are different edges.

[0078] In addition, if Figure 1-Figure 3 As shown, the injection device 2 further includes a first end cover 70, and the middle part of the first end cover 70 has an opening. The first end cover 70 is connected to the operation block 12 at one end of the operation block 12, and when the first end cover 70 is assembled on the operation block 12, it can cover the locking device 16 disposed inside the operation block 12. The injection device 2 further includes a second end cover 72, which is connected to the other end of the housing 9 opposite to the opening 15.

[0079] like Figure 5 As shown, in actual operation, before the injection head assembly 3 is intended to be assembled into the injection device 2, the locking device 16 can be placed in the unlocked position. At this time, the radial inner edge of the locking device 16 forms a second passage with a larger cross-sectional area in the injection head fixing structure 13, so that the injection head assembly 3 can be assembled into the injection device 2 through the second passage. Figure 9-11 As shown, when the injection head assembly 3 is placed in place on the injection device 2, the operator can manually rotate the operating block 12 to rotate the operating block 12 from the initial position to the trigger position. Under the transmission of the transmission device, the orientation of the locking device 16 changes, and the locking device 16 moves to the locking position accordingly, and its radial inner edge forms a first passage in the injection head fixing structure 13.

[0080] Additionally or optionally, each locking block 17 is further connected to a torsion spring (not shown), which can apply a torsion force to the locking block 17 to change the second orientation to the first orientation. This solution enables the locking block 17 to automatically reset under the action of the torsion spring when the injection head assembly 3 is assembled into the injection device 2, that is, its orientation automatically changes to the first orientation and "extends radially inward" toward the central axis of the operating block, and the operating block 12 automatically rotates to the trigger position.

[0081] In a preferred embodiment, Figure 1 and Fig.14 As shown, a recessed portion 23 is provided on the outer periphery of the injection head body 4. When the locking device 16 is in the locking position, its radial inner edge can extend into the recessed portion 23 of the injection head body 4 to cooperate therewith, thereby limiting the position of the injection head body 4 and preventing it from moving.

[0082] Limit device

[0083] like Figure 2 and Figure 3 As shown, preferably, the injection device 2 further comprises a limiting device 36, and the limiting device 36 has a limiting state and a releasing state. The limiting device 36 is configured to limit the operation block 12 from rotating in the first direction from the initial position to the trigger position in the limiting state. This solution can prevent the injection head assembly 3 from being unable to be installed in the injection device 2 due to the operation block 12 being rotated to the trigger position due to unintentional toggling when the injection head assembly 3 has not been installed in the injection device 2.

[0084] like Figure 3 , Figure 6 and Figure 7 As shown, in a preferred embodiment, the inner periphery of the operating block 12 is provided with a stop flange 34 protruding radially inward. The limiting device 36 includes a limiting block 35, which is preferably configured as an arc-shaped rod. The limiting block 35 is connected to the opening 15 of the housing 9 and is disposed on the inner side of the operating block 12. Figure 6 and Figure 7 As shown in FIG. 1 , when the limiting device 36 is in the limiting state, the first end of the limiting block 35 abuts against the stop flange 34 from one circumferential side of the stop flange 34. Since the stop flange 34 on the operating block 12 is blocked by the limiting block 35, it cannot rotate in the first direction toward the limiting block 35. Fig.21 As shown in FIG. 1 , when the limiting device 36 is in the released state, the first end of the limiting block 35 moves away from one circumferential side of the stop flange 34, so that the operating block 12 can rotate freely. Fig.12 and Fig.13In the injection device shown, the limiting device is also in a released state, at which time the stop flange 34 has rotated a certain angle along with the operating block 12 .

[0085] Preferably, the stopper 35 is rotatably connected to the opening 15 of the housing 9 via a fourth pivot 37, and the fourth pivot 37 is disposed between a first end of the stopper 35 and a second end opposite to the first end. Preferably, the stopper 36 further comprises an elastic member 38, which may be configured as a spring, and the spring may act on the first end of the stopper 35 so that the first end abuts against one circumferential side of the stop flange 34 in the limit state. It can be understood that at this time, the first end of the stopper 35 is in a state of being pressed by the spring, and correspondingly, the second end of the stopper 35 is in a "tilted" state. When the injection head assembly 3 is installed in place in the injection device 2, the injection head body 4 may be pressed against the second end of the stopper 35, thereby the second end of the stopper 35 "sinks" in the radial direction, and the first end thereof is correspondingly "tilted" to move away from one circumferential side of the stop flange 34, so that the rotation of the operating block 12 is no longer restricted, and the operating block 12 may be smoothly rotated from the initial position to the trigger position. Accordingly, the locking device 16 can be moved synchronously to the locking position.

[0086] In the preferred embodiment shown in the figure, the injection device 2 includes three groups of limiting devices 36, and the three groups of limiting devices 36 are evenly spaced and arranged on the opening portion 15 of the housing 9. It can be understood that in other embodiments not shown, the injection device 2 can also include other numbers of limiting devices, such as two groups or four groups.

[0087] Joining device

[0088] like Figure 3 and Figure 8 As shown, the injection device 2 further comprises a coupling device 11 , which is mainly used to couple the drug storage body 5 on the injection head assembly 3 to the push rod 10 , so that the drug storage body 5 can move together with the push rod 10 .

[0089] The engagement device 11 is connected to the push rod 10 and can move synchronously with the push rod 10. The engagement device 11 has an engagement position and a disengagement position. Fig.10 as well as Figure 14-18 As shown, when the engagement device 11 is in the engagement position, it can be engaged with the medicine storage body 5, so that the engagement device 11 can make the medicine storage body 5 also move synchronously with the push rod 10. Fig.19 as well as Figure 22-Figure 23As shown, when the engagement device 11 is in the disengaged position, the engagement with the drug storage body 5 can be disengaged, so that the drug storage body 5 can be freely removed from the injection device 2, and in this state, the drug storage body 5 can also be freely installed on the injection device 2. When the injection head assembly 3 is to be installed on the injection device 2 and the drug inhalation or injection operation is to be performed, the engagement device 11 can be placed in the engaged position.

[0090] Preferably, the driving device described above is also linked with the engaging device 11. Figure 4 , Figure 8 , Fig.19 as well as Figure 22-Figure 23 As shown in FIG. 1 , when the driving device is in the initial position, the engaging device 11 is in the disengaged position. Fig.10 as well as Figure 14-18 As shown, when the driving device is in the triggering position, the engagement device 11 can be in the engagement position.

[0091] According to the above scheme, the driving device can be placed in the initial position before the injection head assembly 3 is placed in the injection device 2, so that the locking device 16 is in the unlocked position and the engaging device 11 is in the disengaged position, thereby facilitating the injection head assembly 3 to smoothly enter the injection device 2; and after the injection head assembly 3 enters the injection device 2, the driving device can be placed in the trigger position, so that the locking device 16 can be correspondingly in the locked position to lock the position of the injection head body 4, and the engaging device 11 can be correspondingly in the engaged position to engage with the medicine storage body 5. According to the injection device 2 of this scheme, the locking device 16 and the engaging device 11 can both respond at the same time by driving one component of the driving device, the design is more compact and reasonable, and the cost can be reduced.

[0092] Preferably, if Figure 3 As shown, the engaging device 11 is rotatably connected to the push rod 10 via a pivot shaft 39, and the pivot shaft 39 is arranged between a first end of the engaging device 11 and a second end opposite to the first end. The first end of the engaging device 11 is provided with an engaging portion 40, such as Fig.10 as well as Figure 14-18 As shown, when the engagement device 11 is in the engagement position, the engagement portion 40 is close to the central axis of the push rod 10, and correspondingly, the second end of the engagement device 11 is away from the central axis of the push rod 10. Fig.19 as well as Figure 22-Figure 23 As shown, when the engaging device 11 is in the disengaged position, the engaging portion 40 is away from the central axis of the push rod 10 , and correspondingly, the second end of the engaging device 11 is close to the central axis of the push rod 10 .

[0093] like Figure 4As shown, a long hole 41 is provided on the push rod 10, and the coupling device 11 is arranged at the long hole 41. When the coupling device 11 is in the engaging position, the coupling part 40 preferably extends through the long hole 41 to the inside of the push rod 10. When the coupling device 11 is in the disengaging position, the coupling part 40 withdraws from the inside of the push rod 10.

[0094] like Figure 4 and Figure 8 As shown, in a preferred embodiment, a retaining structure 44 is provided on the drive device, and the retaining structure 44 is configured to retain the engaging portion 40 in a disengaged position when the drive device is in an initial position. This solution can facilitate the assembly of the injection head assembly 3 into the injection device 2 by retaining the engaging portion 40 in a disengaged position when the drive device is in an initial position.

[0095] Preferably, the holding structure 44 is configured as a planar holding plate disposed on the inner side of the operating block 12. Figure 3 and Figure 8 As shown, the second end of the engaging device 11 is provided with a cam structure 45, and the cam structure 45 is connected to the engaging portion 40. Figure 4 and Figure 8 As shown, when the operating block 12 is in the initial position, the retaining structure 44 presses against the cam structure 45 in the direction toward the central axis of the push rod 10, so that the cam structure 45, that is, the second end of the engaging device 11, rotates in the direction toward the central axis of the push rod 10, and accordingly, the first end of the engaging device 11, that is, the engaging portion 40, rotates in the direction away from the central axis of the push rod 10. When the operating block 12 rotates to the trigger position, the retaining structure 44 also moves away from the cam structure 45 as the operating block 12 rotates, so that it no longer presses against the cam structure 45, and accordingly, the engaging portion 40 rotates in the direction close to the central axis of the push rod 10 under the action of the actuating device (described below).

[0096] In a preferred embodiment, Figure 3 As shown, the engagement device 11 further includes an actuating structure 46, which is configured to be able to drive the engagement device 11 to rotate to the engagement position when the drive device is in the trigger position. Further preferably, the actuating structure 46 is configured as an elastic member, and the elastic member can act on the first end of the engagement device 11. As described above, when the drive device is in the initial position, the first end of the engagement device 11 (that is, the engagement portion 40) is away from the central axis of the push rod 10, and the elastic member is in a compressed state. When the drive device is in the trigger position, the second end of the engagement device 11 is no longer subjected to pressure, so that, accordingly, the first end of the engagement device 11 can be rotated to the engagement position along the direction toward the central axis of the push rod 10 under the elastic force of the elastic member.

[0097] Preferably, if Figure 1 , Figure 3 and Fig.10 As shown, the engaging portion 40 is provided with a first tooth structure 42, and the outer periphery of the drug storage body 5 is provided with a second tooth structure 43 that cooperates with the first tooth structure 42. When the engaging device 11 is in the engaging position, the first tooth structure 42 and the second tooth structure 43 are engaged to improve the matching strength of the engaging device 11 and the drug storage body 5.

[0098] Push rod locking structure

[0099] like Figure 2 and Figure 3 As shown, the injection device 2 further includes a push rod locking structure 14, which has a locked state and an unlocked state, and the push rod locking structure can lock the position of the push rod 10 in the locked state, and can unlock the position of the push rod 10 in the unlocked state. The push rod locking structure 14 is connected to the push rod 10, and the push rod locking structure 14 is configured to lock the push rod 10 when the push rod 10 moves to the second position. Since the push rod is in the second position, it is at the stage where the drug liquid is absorbed and is ready for injection. At this time, the push rod 10 is locked by the push rod locking structure 14, and it can be kept in the current position, which limits its return to the first position under the action of the ejection device (described below) to cause erroneous operation.

[0100] Preferably, the push rod locking structure 14 includes a connecting rod 47, and the connecting rod 47 has different positions when the push rod locking structure 14 is in a locked state and an unlocked state. Further, the first end of the connecting rod 47 is rotatably connected to the outer side of the push rod 10 via a first pin 62 and can move with the push rod 10. The push rod locking structure 14 also includes a guide rail 48, and the second end of the connecting rod 47 is slidably arranged in the guide rail 48 via a second pin 63, so that the guide rail 48 can guide and limit the movement path of the connecting rod 47. The second end is arranged opposite to the first end. Preferably, the injection device 2 also includes a handle portion 49, and the handle portion 49 can be held by a user. The handle portion 49 is fixedly connected to one side of the housing 9, and the guide rail 48 is arranged in the handle portion 49.

[0101] like Fig.14 and Fig.15 As shown, when the push rod 10 moves from the first position to the second position inside the housing 9, it can drive the first end of the connecting rod 47 connected thereto to move synchronously. Correspondingly, the second end of the connecting rod 47 away from the first end slides along the guide rail 48 in the guide rail 48. At this time, the spatial movement of the connecting rod 47 is a combined movement of the linear movement of the push rod 10 to the second position away from the injection cavity and the rotation around the connection point between the connecting rod 47 and the push rod 10 (that is, the first pin 62) as the axis.

[0102] Preferably, return reference Figure 3The guide rail 48 includes a first guide rail portion 50 and a second guide rail portion 51 connected to the first guide rail portion 50. The extension direction of the first guide rail portion 50 is substantially perpendicular to the central axis of the push rod 10. There is a critical position 52, i.e., an inflection point, between the first guide rail portion 50 and the second guide rail portion 51. The second guide rail portion 51 is inclined relative to the first guide rail portion 50 in a direction toward the opening portion 15 at the critical position 52. Preferably, the second guide rail portion 51 is arranged at an obtuse angle to the first guide rail portion 50. Fig.15 As shown, when the push rod 10 moves to the second position, the action of extracting the liquid medicine is completed. At this time, the second end of the connecting rod 47 just moves from the first guide rail portion 50 to the critical position 52.

[0103] Preferably, the push rod locking structure 14 further includes a first trigger mechanism 53, which is connected to the handle portion 49 at one end of the handle portion 49. The first trigger mechanism 53 can push the second end of the connecting rod 47 from the critical position 52 to the second guide rail portion 51. When the second end of the connecting rod 47 is in the second guide rail portion 51, the connecting rod 47 is in a locked state. Fig.15 and Fig.16 As shown, in actual operation, the user can push the first trigger mechanism 53 in the direction toward the second end of the connecting rod 47. Under the push of the first trigger mechanism 53, the second end of the connecting rod 47 swings and moves into the second guide rail portion 51 without the push rod 10 moving linearly. At this time, supported and hindered by the connecting rod 47, the push rod 10 cannot return to the first position from the second position, that is, the push rod 10 cannot move toward the injection cavity, and thus the position of the push rod 10 is locked.

[0104] Preferably, the first trigger mechanism 53 includes an arc-shaped protrusion 54 . When the first trigger mechanism 53 is pushed, the protrusion 54 can press the second end of the connecting rod 47 in a direction toward the second guide rail portion 51 to make it enter the second guide rail portion 51 .

[0105] Preferably, the push rod locking structure 14 further includes a second trigger mechanism 55, which is connected to the side of the handle portion 49 opposite to the first trigger mechanism 53. The second trigger mechanism 55 is configured to move the second end of the connecting rod 47 from the second guide portion 51 to the critical position 52. When the second end of the connecting rod 47 is at the critical position 52, the connecting rod 47 is in an unlocked state. At this time, the push rod 10 can freely move from the second position to the first position to perform an injection operation. When the push rod 10 moves, the first end of the connecting rod 47 moves with the push rod 10, while the second end of the connecting rod 47 slides in the first guide portion 50.

[0106] like Fig.16As shown, preferably, the connecting rod 47 further includes an extension end 56, which extends outwardly obliquely from the second end of the connecting rod 47, and has an arc-shaped outer contour. The second trigger mechanism 55 includes a convex rib 57 extending toward the first trigger mechanism 53, and the convex rib 57 has a sharp corner. Preferably, when the second end of the connecting rod 47 is in the second guide rail portion 51, the convex rib 57 abuts against the side of the extension end 56. Fig.17 As shown, when the second trigger mechanism 55 is actuated in the direction indicated by the arrow in the figure, the convex rib 57 can push the extension end 56 from the side of the extension end 56 in the direction toward the first trigger mechanism 53, thereby pushing the second end of the connecting rod 47 from the second guide rail portion 51 to the critical position 52.

[0107] According to the push rod locking structure of the above scheme, the mutual collision between the locking elements in the prior art can be eliminated, which is beneficial to control the noise generated during the drug inhalation or injection operation.

[0108] In a preferred embodiment, Figure 3 As shown, the push rod locking structure 14 also includes an elastic body 58, which is arranged near the second trigger mechanism 55 and can act on the second trigger mechanism 55. The arrangement of the elastic body 58 can help the second trigger mechanism 55 return to its original position after the action. Preferably, an elastic body can also be arranged at the first trigger mechanism 53, and the elastic body can act on the first trigger mechanism 53 to make it return to its original position after the action.

[0109] Preferably, the injection device 2 further comprises an ejection device, which is configured to apply a force to the injection head assembly 3 toward the outside of the housing 9 when the drive device is in the initial position. For example, when the injection operation is completed and the injection head assembly 3 is to be removed from the injection device 2, the drive device can be rotated to the initial position first. When the drive device is rotated to the initial position, the ejection device can eject the injection head assembly 3 outward. Preferably, as Fig.23 As shown, the ejection device is constructed as an elastic component 59 , and the elastic component 59 is connected to an end of the push rod 10 away from the opening 15 .

[0110] The injection device 2 further comprises a power device configured to drive the push rod 10 from a first position to a second position to extract the drug liquid, and to drive the push rod 10 from the second position to the first position to inject the drug liquid.

[0111] In a preferred embodiment, the power device is an air pump (not shown). A closed space is formed between the end of the push rod 10 away from the opening 15 and the housing 9. Figure 14-18As shown, a through hole 60 is provided on the housing 9, and the air pump is connected to the enclosed space through the through hole 60. When the push rod is intended to move from the first position to the second position, the air pump can be made to draw air from the enclosed space to form a negative pressure. When the push rod is intended to move from the second position to the first position, the air pump can be made to deliver air to the enclosed space.

[0112] The following describes in detail the drug absorption process and injection process of the injection system by taking the power device as an air pump as an example.

[0113] Step 1: Install the Injection Head Assembly

[0114] In this step, if Figure 4-Figure 8 As shown, it is necessary to ensure that the driving device is in the initial position, and accordingly, the locking device 16 in the injection head fixing structure 13 is in the unlocked position, and the engaging device 11 is in the disengaged position, so that the injection head assembly 3 can be smoothly pushed into the injection device 2. At this time, the limiting device 36 is in the limiting state.

[0115] like Figure 9-13 As shown, when the injection head assembly 3 is inserted into the injection device 2, the limiting device 36 is in a released state, so that the driving device can smoothly rotate from the initial position to the trigger position, so that the locking device 16 is in a locked position, limiting the displacement of the injection head body 4, and the engaging device 11 is in an engaged position, so that the drug storage body 5 is engaged with the push rod 10. At this time, the ejection device is in a compressed state.

[0116] Step 2: Extract the drug solution

[0117] In this step, if Fig.14 and Fig.15 As shown, the push rod 10 drives the medicine storage body 5 and the piston assembly 6 connected to the medicine storage body 5 to move in a direction away from the injection micropore 8, so as to extract the liquid medicine in the medicine storage cavity into the injection cavity 7. The push rod 10 can be driven to move by extracting the gas in the closed space between the housing 9 and the end of the push rod 10 from the through hole 60, so that the closed space forms a negative pressure and the push rod 10 moves.

[0118] As the push rod 10 moves, the connecting rod 47 connected thereto moves together with the push rod 10, and the second end of the connecting rod 47 away from the push rod 10 moves along the guide curve of the guide rail 48. When the push rod 10 moves to the extreme position away from the injection micropore 8 (i.e., the second position), the action of extracting the liquid medicine is completed. At this time, the second end of the connecting rod 47 is also at the critical position 52 (i.e., the inflection point). Fig.16As shown, the first trigger mechanism 53 can be pushed at this time, and the connecting rod 47 can swing without linear displacement of the push rod 10 due to the pushing force of the first trigger mechanism 53, so that the second end of the connecting rod 47 moves from the critical position 52 to the second guide rail portion 51. At this time, supported and hindered by the connecting rod 47, the position of the push rod 10 is locked and cannot move toward the injection micropore 8.

[0119] Step 3: Injection

[0120] Before the injection begins, gas can be pressed into the housing 9 through an air pump, thereby generating a thrust on the push rod 10. At this time, due to the locking effect of the connecting rod 47, the push rod 10 cannot move toward the injection micropore 8 by itself. Fig.17 As shown, the second trigger mechanism 55 can be pushed in the direction of the arrow in the figure to push the second end of the connecting rod 47 to move from the second guide rail portion 51 to the critical position 52 along the guide rail. When the second end of the connecting rod 47 moves to the critical position 52, the connecting rod 47 can no longer lock the position of the push rod 10, so as Fig.18 As shown, the push rod 10 pushes the medicine storage body 5 and the piston assembly 6 to spray the medicine liquid inside the injection cavity.

[0121] Step 4: Remove the injection chamber

[0122] After the injection is completed, the drive device can be operated to rotate from the trigger position to the initial position. Figure 19-22 The state in which the driving device has been operated but the injection head assembly 3 has not been ejected by the ejection device is shown. In response to the operation of the driving device, at this time, the locking device 16 is in the unlocked position, and the engaging device 11 is in the disengaged position. At this time, the limiting device 36 is still in the released state. Figure 23-25 The injection head assembly 3 is shown in a state where it has been ejected by the ejection device. When the injection head assembly 3 is completely removed from the injection device, the limiting device 36 returns to the limiting state, the driving device is in the initial position, the locking device 16 is in the unlocking position, and the engaging device 11 is in the disengaged position.

[0123] According to the injection device 2 and injection system 1 of the present invention, the driving device can realize linkage with both the locking device 16 and the engaging device 11 at the same time, so that the locking device 16 and the engaging device 11 can both respond by operating the driving device. This solution can place the driving device in the initial position before placing the injection head assembly 3 in the injection device 2, so that the locking device 16 is in the unlocked position and the engaging device 11 is in the disengaged position, thereby facilitating the injection head assembly 3 to enter the injection device 2 smoothly. When the injection head assembly 3 enters the injection device 2, the driving device can be placed in the trigger position, so that the locking device 16 locks the position of the injection head body 4 and the engaging device 11 engages with the drug storage body 5, thereby facilitating the drug suction operation and the injection operation. The injection device 2 of this solution is more compact in design and can reduce costs.

[0124] Implementation Method 2

[0125] References below Figure 29-Figure 32 The injection device according to the second preferred embodiment of the present invention is described in detail. Except for the structure of the locking device, the injection device according to the second preferred embodiment has substantially the same structure as the injection device according to the first preferred embodiment, and therefore, for the sake of brevity, only the differences are described in detail here.

[0126] like Figure 29-Figure 32 As shown, the locking device 16' includes a plurality of locking rods 24, and the plurality of locking rods 24 are arranged along the circumferential direction of the operating block 12'. The first end of the locking rod 24 is rotatably connected to the housing 9' via a first rotating shaft 25. In this embodiment, the transmission device includes a connecting rod 26, and the second end of the locking rod 24 opposite to the first end is rotatably connected to the first end of the connecting rod 26 via a second rotating shaft 27, and the second end of the connecting rod 26 is rotatably connected to the operating block 12' via a third rotating shaft 28. Thus, when the operating block 12' rotates, its action can be transmitted to the connecting rod 26, and then the connecting rod 26 can drive the locking rod 24 to move, thereby changing the orientation of the connecting rod 26.

[0127] Preferably, the number of connecting rods 26 is the same as the number of locking rods 24. In the illustrated embodiment, the number of connecting rods 26 and the number of locking rods 24 are both 3. It is understood that in other embodiments not shown, those skilled in the art may also provide other numbers of connecting rods and locking rods as needed. The connecting rod 26 is generally configured as a straight rod. The locking rod 24 is generally configured as an arc-shaped rod, the arc of which generally matches the arc of the operating block 12', so that when the locking device 16' is in the unlocked position, it can fit against the inner periphery of the operating block 12'. Fig.31As shown, the plurality of locking rods 24 are butted against each other end to end in the circumferential direction of the operating block 12 ′. Preferably, the length of the connecting rod 26 is shorter than the length of the locking rod 24 .

[0128] Continue to refer Fig.31 and Fig.32 The inner circumference of the operating block 12' is provided with a first boss portion 29 protruding radially inward at the third rotating shaft 28 where the connecting rod 26 is provided, and the side of the second end of the locking rod 24 facing the operating block 12' is provided with a second boss portion 30 protruding radially outward and a groove portion 31 adjacent to the second boss portion 30. Fig.31 As shown, when the locking device 16' is in the unlocked position, the locking lever 24 is oriented so that the first boss portion 29 engages in the groove portion 31, as shown in FIG. Fig.32 As shown, when the operating block 12' rotates from the initial position to the trigger position, the second end of the locking rod 24 rotates radially inward along the operating block 12' driven by the connecting rod 26, so that the first boss portion 29 abuts against the second boss portion 30 along the radial direction of the operating block 12', so that the radial inner edge of the locking rod 24 is closer to the central axis of the push rod.

[0129] like Fig.32 As shown, when the locking device 16' is in the locking position, the locking rod 24 is arranged in a first orientation relative to the central axis of the operating block 12'. At this time, the radial inner edge of the locking rod 24 (especially the second end of the locking rod 24) is in a "radially inwardly extending" state, and the radial inner edges of the multiple locking rods 24 form a first passage. Fig.31 As shown, when the locking device 16' is in the unlocked position, the locking rod 24 is arranged in the second orientation relative to the central axis of the operating block 12', at which time, the radial inner edge of the locking rod 24 (especially the second end of the locking rod 24) is in a "radially outwardly retracted" state, and the radial inner edges of the plurality of locking rods 24 form a second passage. It can be seen that the cross-sectional area of ​​the first passage formed by the radial inner edge of the locking rod 24 when it is in the locked position is smaller than the cross-sectional area of ​​the second passage formed by the radial inner edge of the locking rod 24 when it is in the unlocked position.

[0130] When the locking device 16' is in the locking position, the radial inner edge of the locking rod 24 (especially the second end of the locking rod 24) can extend into the recessed portion 23 of the injection head body 4 to cooperate therewith, thereby limiting the position of the injection head body 4 and preventing it from moving.

[0131] like Fig.31 and Fig.32As shown, preferably, the first end of the locking rod 24 is provided with an arc-shaped protrusion 32, and the second end of the locking rod 24 is provided with an arc-shaped recess 33. When the locking device 16' is in the locking position, the protrusion 32 of the locking rod 24 can be just engaged in the recess 33 of another locking rod 24 adjacent to the locking rod 24.

[0132] Implementation 3

[0133] References below Figure 33-Figure 34 The injection device according to the third preferred embodiment of the present invention is described in detail. Except for the structure of the power device, the injection device according to the third preferred embodiment has substantially the same structure as the injection device according to the first preferred embodiment, and therefore, for the sake of brevity, only the differences are described in detail here.

[0134] like Fig.33 and Fig.34 As shown, the power device is constructed as an elastic element 61 disposed between the housing 9' and the end of the push rod 10' away from the opening 15'. In this embodiment, the push rod 10' is also provided with a push portion 71 extending to the outside of the housing 9', and the push portion 71 can be operated by the user. In actual use, the user can drive the push portion 71 by hand or with a tool to push the push rod 10' from a first position close to the injection chamber 7' to a second position away from the injection chamber 7', so as to absorb the liquid medicine from the medicine storage body 5' through the piston assembly 6' into the injection chamber 7', and complete the extraction of the liquid medicine, at which time the elastic element 61 is in a compressed state. When the liquid medicine extraction is completed and the injection operation is intended, when the push rod locking structure 14' is in an unlocked state, the elastic element 61 can automatically pop open to push the push rod 10' from the second position to the first position, so that the liquid medicine in the injection chamber 7' is ejected.

[0135] The mating features such as protrusions, grooves, flanges, snaps, etc. in each mating structure group provided in this embodiment can be a structure that extends in the circumferential direction and is intermittently arranged, or a structure that is continuously arranged in the circumferential direction, and the injection equipment can make some structural adjustments accordingly.

[0136] In addition, although the embodiment of the present invention takes a needle-free syringe as an example, the structure of the present invention can also be applied to a syringe with a needle.

[0137] The above description of various embodiments of the present invention is provided to one of ordinary skill in the relevant art for the purpose of description. It is not intended that the present invention be exclusive or limited to a single disclosed embodiment. As above, a person of ordinary skill in the field of the above teachings will understand the various substitutions and variations of the present invention. Therefore, although some alternative embodiments are specifically described, a person of ordinary skill in the art will understand or relatively easily develop other embodiments. The present invention is intended to include all substitutions, modifications and variations of the present invention described herein, as well as other embodiments that fall within the spirit and scope of the present invention described above.

Claims

1. An injection device for use with an injection head assembly, the injection head assembly comprising an injection head body and a piston assembly, the injection head body being provided with an injection cavity, the piston assembly being configured to be movable in the injection cavity, characterized in that: The injection device comprises: a housing having an opening; a push rod movably disposed in the housing, the push rod being configured to engage with the piston assembly; and an injection head fixing structure connected to the opening of the housing, the injection head fixing structure comprising a locking device configured to be movable between a locked position and an unlocked position, When the locking device is in the locking position, the radial inner edge of the locking device forms a first passage in the injection head fixing structure, and when the locking device is in the unlocking position, the radial inner edge of the locking device forms a second passage in the injection head fixing structure through which the injection head body can pass, and the cross-sectional area of ​​the first passage is smaller than the cross-sectional area of ​​the second passage. The injection device further comprises a driving device, the driving device being connected to the locking device and being configured to drive the locking device to move. The driving device is configured as an annular operating block, the operating block being sleeved on the opening of the housing, the operating block being configured to be rotatable relative to the housing in a first direction and in a second direction opposite to the first direction, wherein when the operating block rotates in the first direction, the locking device can be driven to move to the locking position, and when the operating block rotates in the second direction, the locking device can be driven to move to the unlocking position.

2. The injection device according to claim 1, characterized in that The injection head fixing structure further includes a transmission device, which is connected to the operating block and the locking device respectively, and is configured to change the orientation of the locking device when the operating block rotates.

3. The injection device according to claim 2, characterized in that The locking device includes a locking block rotatably connected to the housing via a pivot, and the transmission device includes an external gear provided on an outer periphery of the locking block and an internal gear provided on an inner periphery of the operating block, the external gear meshing with the internal gear.

4. The injection device according to claim 3, characterized in that The locking device includes a plurality of locking blocks evenly spaced apart along a circumferential direction of the operating block.

5. The injection device according to claim 3, characterized in that The locking block includes a main body portion substantially in a rectangular parallelepiped shape and a dome portion connected to the main body portion, and the external gear is disposed on the dome portion.

6. The injection device according to claim 5, characterized in that When the locking device is in the locking position, the locking block is arranged in a first orientation relative to the central axis of the operating block, and when the locking device is in the unlocking position, the locking block is arranged in a second orientation relative to the central axis. When the locking block is in the first orientation, the length direction of the main body is roughly consistent with the radial direction of the operating block, and when the locking block is in the second orientation, the width direction of the main body is roughly consistent with the radial direction of the operating block.

7. The injection device according to claim 2, characterized in that The locking device includes a locking rod, and the transmission device includes a connecting rod, the first end of the locking rod is rotatably connected to the housing via a first rotating shaft, the second end of the locking rod is rotatably connected to the first end of the connecting rod via a second rotating shaft, and the second end of the connecting rod is rotatably connected to the operating block via a third rotating shaft.

8. The injection device according to claim 7, characterized in that The inner circumference of the operating block is provided with a first boss portion at the third rotating shaft, and the side of the second end of the locking rod facing the operating block is provided with a second boss portion and a groove portion adjacent to the second boss portion. When the locking device is in the unlocking position, the locking rod is oriented so that the first boss portion engages in the groove portion, and when the locking device is in the locking position, the locking rod is oriented so that the first boss portion abuts against the second boss portion along the radial direction of the operating block.

9. The injection device according to claim 7, characterized in that The locking device includes a plurality of locking rods and a plurality of connecting rods corresponding to the number of the plurality of locking rods, each locking rod is substantially configured in an arc shape, and the plurality of locking rods abut against each other end to end in the circumferential direction of the operating block.

10. The injection device according to claim 9, characterized in that The first end of the locking rod is provided with an arcuate convex portion, and the second end of the locking rod is provided with an arcuate concave portion. When the locking device is in the locking position, the convex portion of the locking rod is engaged in the concave portion of another locking rod adjacent to the locking rod.

11. The injection device according to claim 1, characterized in that The injection head fixing structure further includes a torsion spring connected to the locking device, wherein the torsion spring is configured to apply a torsion force to the locking device so as to move the locking device from the unlocking position to the locking position.

12. The injection device according to claim 1, characterized in that The injection device further includes a limiting device having a limiting state and a releasing state, and the limiting device is configured to limit the operation block from rotating along the first direction in the limiting state.

13. The injection device according to claim 12, characterized in that The inner circumference of the operating block is provided with a stop flange protruding radially inward, and the limiting device includes a limit block, which is connected to the opening portion of the shell and is arranged on the inner side of the operating block. When the limiting device is in the limiting state, the first end of the limit block abuts against the stop flange from one circumferential side of the stop flange, and when the limiting device is in the released state, the first end of the limit block can be away from the stop flange.

14. The injection device according to claim 13, characterized in that The limiting block is rotatably connected to the opening portion of the housing via a fourth pivot, and the fourth pivot is disposed between a first end of the limiting block and a second end opposite to the first end.

15. The injection device according to claim 13, characterized in that The limiting device further includes an elastic member, and the elastic member is configured to act on the first end of the limiting block so that the first end abuts against the stop flange in the limiting state.

16. The injection device according to any one of claims 12 to 15, characterized in that The injection device comprises a plurality of stoppers arranged at intervals along the circumferential direction of the housing.

17. An injection system, characterized in that: The injection system comprises: An injection head assembly, the injection head assembly comprising an injection head body and a piston assembly, the injection head body being provided with an injection cavity, the piston assembly being configured to be movable in the injection cavity; and An injection device as claimed in any one of claims 1 to 16.

18. The injection system according to claim 17, characterized in that A recessed structure is provided on the outer periphery of the injection head body. When the locking device is in the locking position, at least a portion of the radial inner edge of the locking device extends into the recessed structure.

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