Injecting device and injection system including the same

Abstract

The present invention provides an injection device and an injection system. The injection device is used in cooperation with an injection head assembly. The injection head assembly includes an injection head body, a medicine storage body, and a piston assembly. The injection device includes a housing, a push rod, an engaging device, an injection head fixing structure, and a driving device. The engaging device has an engaging position, and when the engaging device is in the engaging position, it can be engaged to the medicine storage body. The injection head fixing structure includes a locking device, and the locking device has a locking position. When the locking device is in the locking position, it can lock the position of the injection head body. The driving device is linked with the locking device and the engaging device. The driving device has an initial position and a triggering position. When the driving device is in the initial position, the locking device is in the unlocked position and the engaging device is in the disengaged position. When the driving device is in the triggering position, the locking device is in the locking position and the engaging device is in the engaging position. The injection device according to the above solution is more convenient for the disassembly and assembly of components.

Description

Technical Field

[0001] The present invention relates to the field of medical devices. More specifically, the present invention relates to an injection device capable of assisting an injection head assembly to aspirate and inject a liquid medicine, and an injection system including the injection device. Background Art

[0002] In existing injection systems, sometimes an auxiliary injection device is provided to assist an injection head component in performing an injection operation, which can save manpower to a certain extent. However, in this case, it is usually necessary to assemble the auxiliary injection device with the injection head component. However, due to too many components in the existing injection system, the assembly steps are relatively cumbersome, the joining process is relatively complex, and too much manual intervention by the user is required, which brings inconvenience to the operation. Moreover, misoperation may occur, resulting in injection failure.

[0003] Therefore, there is a need 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 in cooperation with an injection head assembly, the injection head assembly including an injection head body, a medicine storage body, and a piston assembly, the piston assembly being connected to the medicine storage body and being configured to be able to move synchronously with the medicine storage body, an injection cavity being provided in the injection head body, the piston assembly being configured to be able to move in the injection cavity, the piston assembly being able to communicate the medicine storage body and the injection cavity, the injection device including:

[0005] A housing having an opening;

[0006] A push rod provided in the housing, the push rod being configured to be able to move between a first position close to the opening and a second position away from the opening, the push rod being configured to allow at least a part of the medicine storage body to enter;

[0007] An engaging device connected to the push rod, the engaging device having an engaging position and a disengaging position, and being able to engage with the medicine storage body when the engaging device is in the engaging position;

[0008] An injection head fixing structure connected to the opening of the housing, the injection head fixing structure including a locking device having a locking position and an unlocking position, and being able to lock the position of the injection head body when the locking device is in the locking position; and

[0009] A drive device, which is configured to be linked with the locking device and the engaging device. The drive device has an initial position and a trigger position. When the drive device is in the initial position, the locking device is in the unlocked position and the engaging device is in the disengaged position. When the drive device is in the trigger position, the locking device is in the locked position and the engaging device is in the engaged position.

[0010] Preferably, the drive device is configured as an annular operating block, which is engaged with an opening of the housing. The operating block is configured to be rotatable relative to the housing between the initial position and the trigger position in a first direction and a second direction opposite to the first direction. Wherein the operating block can be rotated in the first direction to the trigger position and can be rotated in the second direction to the initial position.

[0011] Preferably, a first end of the engaging device includes an engaging portion. When the engaging device is in the engaged position, the engaging portion is close to the central axis of the push rod. When the engaging device is in the disengaged position, the engaging portion is away from the central axis of the push rod.

[0012] Preferably, a long hole is provided on the push rod, and the engaging device is arranged at the long hole. When the engaging device is in the engaged position, the engaging portion extends through the long hole into the interior of the push rod. When the engaging device is in the disengaged position, the engaging portion is away from the interior of the push rod.

[0013] Preferably, the engaging portion is provided with a first toothed structure.

[0014] Preferably, the engaging device is rotatably connected to the push rod via a pivot shaft, and the pivot shaft is arranged between a first end and a second end opposite to the first end of the engaging device.

[0015] Preferably, a holding structure is provided on the drive device, and the holding structure is configured to be able to hold the engaging portion in the disengaged position when the drive device is in the initial position.

[0016] Preferably, the holding structure is arranged on the inner side of the operating block, and a cam structure is provided at a second end of the engaging device. When the drive device is in the initial position, the holding structure presses against the cam structure along a direction towards the central axis of the push rod, so that the second end of the engaging device rotates along a direction towards the central axis of the push rod. When the drive device is in the trigger position, the holding structure is away from the cam structure.

[0017] Preferably, the engaging device further includes an actuating structure configured to drive the engaging device to rotate to the engaged position when the driving device is in the triggering position.

[0018] Preferably, the actuating structure is configured as an elastic member that can act on the first end of the engaging device.

[0019] Preferably, when the locking device is in the locked position, the radially inner edge of the locking device forms a first passage in the injection head fixing structure, and when the locking device is in the unlocked position, the radially 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.

[0020] Preferably, the injection head fixing structure further includes a transmission device that is respectively connected to the operating block and the locking device, and the transmission device is configured to be able to change the orientation of the locking device when the operating block rotates.

[0021] Preferably, the locking device includes a locking block that is rotatably connected to the housing via a pivot, and the transmission device includes an external gear provided on the outer periphery of the locking block and an internal gear provided on the inner periphery of the operating block, and the external gear meshes with the internal gear.

[0022] Preferably, the locking device includes a plurality of locking blocks that are evenly spaced along the circumferential direction of the operating block.

[0023] Preferably, the locking block includes a main body portion that is generally rectangular parallelepiped-shaped and a rounded top portion connected to the main body portion, and the external gear is provided on the rounded top portion.

[0024] Preferably, when the locking device is in the locked 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 unlocked 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 portion is substantially 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 portion is substantially consistent with the radial direction of the operating block.

[0025] 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.

[0026] Preferably, a first boss portion is provided at the inner circumference of the operation block at the third rotating shaft. A second boss portion and a groove portion adjacent to the second boss portion are provided on the side surface of the second end of the locking rod facing the operation block. When the locking device is in the unlocking position, the locking rod is oriented such that the first boss portion engages in the groove portion. When the locking device is in the locking position, the locking rod is oriented such that the first boss portion abuts against the second boss portion in the radial direction of the operation block.

[0027] Preferably, 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 generally configured in an arc shape, and the plurality of locking rods abut against each other end to end in the circumferential direction of the operation block.

[0028] Preferably, an arc-shaped convex portion is provided at the first end of the locking rod, and an arc-shaped concave portion is provided at the second end of the locking rod. 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.

[0029] Preferably, the injection device further includes a limiting device, which has a limiting state and a releasing state, and is configured to be able to limit the rotation of the operation block along the first direction in the limiting state.

[0030] Preferably, a radially inwardly protruding stop flange is provided at the inner circumference of the operation block. The limiting device includes a limiting block, which is connected to the opening of the housing and is arranged inside the operation block. When the limiting device is in the limiting state, the first end of the limiting block abuts against the stop flange from one circumferential side of the stop flange. When the limiting device is in the releasing state, the first end of the limiting block is away from the stop flange.

[0031] Preferably, the limiting block is rotatably connected to the opening of the housing via a fourth pivot shaft, and the fourth pivot shaft is arranged between the first end and the second end opposite to the first end of the limiting block.

[0032] Preferably, the limiting device further includes an elastic member, which is configured to be able to act on the first end of the limiting block so that the first end abuts against the stop flange in the limiting state.

[0033] Preferably, the injection device further includes a push rod locking structure, which is connected to the push rod. The push rod locking structure has a locked state and an unlocked state, and is configured to be able to lock the position of the push rod when in the locked state and unlock the position of the push rod when in the unlocked state.

[0034] Preferably, the push rod locking structure includes a connecting rod. The first end of the connecting rod is rotatably connected to the push rod and can move with the push rod. The push rod locking structure further includes a guide rail. The second end of the connecting rod is slidably disposed in the guide rail, and the second end is disposed opposite to the first end.

[0035] Preferably, the injection device further includes a handle portion, which is connected to one side of the housing, and the guide rail is disposed on the handle portion.

[0036] Preferably, the guide rail includes a first guide rail portion and a second guide rail portion communicating with the first guide rail portion. The extending direction of the first guide rail portion is substantially perpendicular to the central axis of the push rod. The second guide rail portion is inclined in the direction towards the opening portion relative to the first guide rail portion at a critical position. When the push rod moves to the second position, the second end of the connecting rod moves from the first guide rail portion to the critical position.

[0037] Preferably, an obtuse angle is formed between the second guide rail portion and the first guide rail portion.

[0038] Preferably, the push rod locking structure further includes a first triggering mechanism, which is connected to the handle portion and is configured to be able to push the second end of the connecting rod from the critical position into the second guide rail portion. When the second end of the connecting rod is in the second guide rail portion, the connecting rod is in the locked state.

[0039] Preferably, the first triggering mechanism includes an arc-shaped protrusion, which is configured to be able to press against the second end of the connecting rod.

[0040] Preferably, the push rod locking structure further includes a second triggering mechanism, which is connected to the handle portion and is configured to be able to move the second end of the connecting rod from the second guide rail portion to the critical position. When the second end of the connecting rod moves from the second guide rail portion to the critical position, the connecting rod is in the unlocked state.

[0041] Preferably, the connecting rod further includes an extending end, which extends obliquely outward from the second end of the connecting rod. The second triggering mechanism is configured to be able to actuate the extending end to push the second end of the connecting rod from the second guide rail portion to the critical position.

[0042] Preferably, the second triggering mechanism includes a rib extending towards the first triggering mechanism, and the extending end has an arc-shaped outer contour. When the second end of the connecting rod is in the second guide rail portion, the rib abuts against the extending end.

[0043] Preferably, the push rod locking structure further includes an elastic body, which is disposed near the first triggering mechanism or the second triggering mechanism and can act on the first triggering mechanism or the second triggering mechanism.

[0044] Preferably, the injection device further includes an ejection device, which is configured to apply a force towards the outside of the housing to the injection head assembly when the driving device is in the initial position.

[0045] Preferably, the ejection device is configured as an elastic member, and the elastic member is disposed at an end of the push rod away from the opening portion.

[0046] Preferably, the injection device further includes a power device, which is configured to be able to drive the push rod to move from the first position to the second position, and / or drive the push rod to move from the second position to the first position.

[0047] Preferably, the power device is an air pump, a sealed space is formed between an end of the push rod away from the opening portion and the housing, a through hole is provided on the housing, and the air pump is communicated with the sealed space through the through hole.

[0048] Preferably, the power device is an elastic element disposed between the housing and an end of the push rod away from the opening portion.

[0049] According to a second aspect of the present invention, there is also provided an injection system, which includes:

[0050] An injection head assembly, which includes an injection head main body, a medicine storage main body and a piston assembly. The piston assembly is connected to the medicine storage main body and is configured to be able to move synchronously with the medicine storage main body. An injection cavity is provided in the injection head main body. The piston assembly is configured to be able to move in the injection cavity, and the piston assembly can communicate the medicine storage main body and the injection cavity; and

[0051] The injection device as described above, wherein the driving device is configured to be able to be in the initial position before the injection head assembly is installed on the injection device, and be in the triggering position after the injection head assembly is installed on the injection device.

[0052] Preferably, the joining device has a joining portion provided with a first toothed structure, and the outer periphery of the medicine storage body is provided with a second toothed structure capable of cooperating with the first toothed structure.

[0053] Preferably, the outer periphery of the injection head body is provided with a concave structure. When the locking device is in the locked position, at least a part of the radially inner edge of the locking device extends into the concave structure.

[0054] In the injection device and injection system according to the present invention, the driving device can simultaneously achieve linkage with both the locking device and the joining device, so that by operating the driving device, both the locking device and the joining device can generate responses. This solution can place the driving device in the initial position before the injection head assembly is placed in the injection device, so that the locking device is in the unlocked position and the joining device is in the disengaged position, thus facilitating the smooth entry of the injection head assembly into the injection device; when the injection head assembly enters the injection device, the driving device can be placed in the trigger position, so that the locking device locks the position of the injection head body and the joining device joins to the medicine storage body, thus facilitating the medicine suction operation and injection operation. The injection device of this solution is more compact in design, and makes the installation and disassembly of the injection head assembly simpler, which can improve the loading and unloading efficiency and reduce costs. Description of the Drawings

[0055] To better understand the above and other objects, features, advantages and functions of the present invention, reference may be made to the preferred embodiments shown in the drawings. The same or similar reference numerals in the drawings refer to the same or similar components. Those skilled in the art should understand that the drawings are intended to schematically illustrate the preferred embodiments of the present invention and have no restrictive effect on the scope of the present invention. The components in the drawings are not drawn to scale.

[0056] Figure 1 A three-dimensional schematic diagram of an injection system according to a preferred embodiment of the present invention, in which the injection head assembly is in a separated state from the injection device;

[0057] Figure 2 For Figure 1 the exploded schematic diagram of the injection device of the injection system in

[0058] Figure 3 For Figure 2 the further exploded schematic diagram of the injection device in

[0059] Figure 4 For Figure 1 the cross-sectional schematic diagram of the injection device of the injection system in

[0060] Figure 5 For Figure 1 the injection device in Figure 4Partial cross-sectional view when intercepted by the A-A line in;

[0061] Figure 6 is Figure 1 the injection device in when along Figure 4 Partial cross-sectional view when intercepted by the B-B line in;

[0062] Figure 7 is Figure 6 Local enlarged view of part M in;

[0063] Figure 8 is Figure 1 the injection device in when along Figure 4 Partial cross-sectional view when intercepted by the C-C line in;

[0064] Figure 9 is Figure 1 Stereo view of the injection system in, where the injection head assembly is assembled to the injection device;

[0065] Figure 10 is Figure 9 Cross-sectional view of the injection system shown in;

[0066] Figure 11 is Figure 9 Stereo view of the injection system shown in after removing the first end cap;

[0067] Figure 12 is Figure 11 Stereo view of the injection system shown in after removing the locking device;

[0068] Figure 13 is Figure 12 Local enlarged view of part N in;

[0069] Figure 14 and Figure 15 are respectively Figure 9 Partial cross-sectional views of the injection system shown in when the injection device starts to draw the liquid medicine and during the process of drawing the liquid medicine;

[0070] Figure 16 is Figure 9 Partial cross-sectional view of the injection system shown in when the position of the push rod is locked;

[0071] Figure 17 is Figure 9 Partial cross-sectional view of the injection system shown in when the position of the push rod is unlocked;

[0072] Figure 18 is Figure 9 Partial cross-sectional view of the injection system shown in when the injection device performs the injection operation;

[0073] Figure 19 is Figure 9 A partial cross-sectional view of the injection system shown in [reference] when the injection is completed and the drive device has been rotated to the initial position, and the injection head assembly has not been ejected yet;

[0074] Figure 20 is Figure 19 A partial cross-sectional view of the injection system in [reference] when taken along the line A'-A';

[0075] Figure 21 is Figure 19 A partial cross-sectional view of the injection system in [reference] when taken along the line B'-B';

[0076] Figure 22 is Figure 19 A partial cross-sectional view of the injection system in [reference] when taken along the line C'-C';

[0077] Figure 23 is Figure 19 A partial cross-sectional view of the injection system shown in [reference] when the injection head assembly has been ejected by the ejection device to the outside of the housing;

[0078] Figure 24 is Figure 23 A partial cross-sectional view of the injection system in [reference] when taken along the line A''-A'';

[0079] Figure 25 is Figure 23 A partial cross-sectional view of the injection system in [reference] when taken along the line B''-B'';

[0080] Figures 26 - 28 Schematically show 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;

[0081] Figures 29 - 32 Schematically show the injection head fixing structure of the injection device when the locking device is in different states according to a second preferred embodiment of the present invention;

[0082] Figure 33 Show a cross-sectional view of the injection device according to a third preferred embodiment of the present invention; and

[0083] Figure 34 is Figure 33 A cross-sectional view of the injection device shown in [reference] after assembling the injection head assembly. Detailed implementation manners

[0084] Reference is now made to the accompanying drawings to describe in detail the specific embodiments of the present invention. What is described herein is only the preferred embodiments of the present invention, and those skilled in the art can think 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.

[0085] The present invention provides an injection device and an injection system including the injection device. First, 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", "axial direction" and the like mentioned in the present invention can be understood as the direction along the X-X direction in the drawings or a direction parallel to the X-X direction in the drawings; the "radial direction", "radial direction", "circumferential direction", "circumferential direction" and the like mentioned in the present invention are all directions with respect to the X-X axis; the "rotation direction" mentioned in the present invention can be understood as the direction of rotation around the X-X axis, which is roughly equivalent to the "circumferential direction". Figure 4 in the X-X direction in the drawings or a direction parallel to the X-X direction in the drawings; Figure 4 in the drawings; the "radial direction", "radial direction", "circumferential direction", "circumferential direction" and the like mentioned in the present invention are all directions with respect to the X-X axis; the "rotation direction" mentioned in the present invention can be understood as the direction of rotation around the X-X axis, which is roughly equivalent to the "circumferential direction".

[0086] Figures 1 - 34 Shown are an injection device and an injection system including the injection device according to some preferred embodiments of the present invention. The injection device according to the preferred embodiments of the present invention can be used in cooperation with an injection head assembly to assist the injection head assembly in extracting and injecting a liquid medicine. Although Figures 1 - 34 the injection head assembly shown in the drawings is a needleless injection head assembly, 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 embodiments of the present invention can accurately suck the liquid to be injected into the injection cavity in the injection head body (i.e., the medicine sucking step described hereinafter), and can implement the injection operation of the liquid to be injected.

[0087] The injection device according to the preferred embodiments of the present invention can be used in cooperation with an injection head assembly, and the injection device and the injection head assembly together constitute an injection system.

[0088] Embodiment 1

[0089] Reference is made below to Figures 1 - 28 describe in detail the injection device 2 and the injection system 1 according to the first preferred embodiment of the present invention.

[0090] In a preferred embodiment, as shown in Figure 1As shown, the injection head assembly 3 includes an injection head body 4, a medicine storage body 5, and a piston assembly 6. The medicine storage body 5 is generally configured in a cylindrical shape, and one end thereof has an opening for placing a medicine storage bottle therein. One end of the piston assembly 6 is connected to the medicine storage body 5, and the other end extends into the injection head body 4. The injection head body 4 is generally configured in a cylindrical shape, and has an injection cavity 7 therein. An injection micropore 8 communicating the injection cavity 7 with the outside is provided at the end of the injection head body 4. A passage capable of communicating the medicine storage body 5 and the injection cavity 7 is provided in the piston assembly 6. When a medicine suction operation is to be performed, the medicine storage body 5 connected to 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 liquid medicine in the medicine storage body 5 enters the injection cavity through the passage in the piston assembly 6. When an injection operation is to be performed, the injection head body 4 can be pressed against the injection site, such as the skin of a patient, to trigger the medicine storage body 5 connected to the piston assembly 6 to move in a direction toward the injection micropore 8, whereby the liquid medicine in the injection cavity can be injected into the patient's body through the injection micropore 8.

[0091] As Figures 1 - 4 shown, the injection device 2 generally includes a housing 9, a push rod 10, an engagement device 11, a drive 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 15 at one end, and an opening is provided in the middle of the opening 15. The push rod 10 also generally has a cylindrical shape, and is movably disposed in the housing 9. The inside of the push rod 10 is a hollow structure, and at least a part of the medicine storage body 5 can enter the inside of the push rod 10 through the opening 15. Preferably, as Figure 4 shown, in the assembled state, the central axis of the push rod 10 coincides with the central axis of the housing 9, which is shown as X-X in Figure 4 it. The push rod 10 is configured to be movable between a first position close to the opening 15 (as Figure 10 shown) and a second position away from the opening 15 (as Figure 15 shown). When the push rod 10 moves from the first position to the second position inside 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 a medicine suction operation. When the push rod 10 moves from the second position to the first position inside 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 an injection operation. The engagement device 11 is mainly used to engage the medicine storage body 5 to the push rod 10 so that the medicine storage body 5 can move together 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 drive device can be linked with both the locking device 16 and the engagement device 11 so that the locking device 16 and the engagement device 11 can act in response to the action of the drive device. Each component will be described in detail below.

[0092] Injection head fixing structure

[0093] As Figures 1 - 3 shown, the syringe head fixing structure 13 is connected to the opening 15 of the housing 9. The syringe head fixing structure 13 includes a locking device 16 which has a locking position and an unlocking position. When the locking device 16 is in the locking position, the position of the syringe head body 4 can be locked so that it cannot move. When the locking device 16 is in the unlocking position, it can move away from the syringe head body 4 so that the syringe head body 4 can move freely. Thus, when the position of the syringe head body 4 is locked, the medicine storage body 5 and the piston assembly 6 connected to the medicine storage body 5 can move relative to the syringe head body 4 to perform a medicine suction operation or an injection operation; when the position of the syringe head body 4 is unlocked, the syringe head body 4 can be removed from the injection device 2.

[0094] As Figure 11 and Figure 28 shown, when the locking device 16 is in the locking position, the radially inner edge of the locking device 16 forms a first passage in the syringe head fixing structure 13. As Figure 5 and Figure 27 shown, when the locking device 16 is in the unlocking position, the radially inner edge of the locking device 16 forms a second passage in the syringe head fixing structure 13. The cross-sectional area of the first passage is smaller than that of the second passage. The cross-sectional area of the second passage is larger than the outer diameter of the syringe head body 4, and the cross-sectional area of the first passage is smaller than the outer diameter of the syringe head body 4. That is to say, the second passage allows the syringe head body 4 to pass through, and the first passage is arranged so that the syringe head body 4 cannot pass through. Thus, before the syringe head assembly 3 is installed in the injection device 2, the locking device 16 can be placed in the unlocking position. After the syringe head assembly 3 is installed in the injection device 2 and when a medicine taking and / or injection operation is intended, the locking device 16 can be placed in the locking position. In addition, when the medicine taking or injection operation is completed and the syringe head assembly 3 is intended to be removed from the injection device 2, the locking device 16 also needs to be placed in the unlocking position.

[0095] In a preferred embodiment, the driving device is linked with the locking device 16 so that the locking device 16 can act 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. Among them, when the driving device is in the initial position, the locking device 16 can correspondingly be in the unlocking position, and when the driving device moves to the trigger position, the locking device 16 can move to the locking position in response to the trigger of the driving device.

[0096] Preferably, as Figures 1 - 3As shown, the driving device is configured as an annular operating block 12, and the operating block 12 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 between an initial position and a trigger position in a first direction and a second direction opposite to the first direction. Among them, as Figure 11 and Figure 12 shown, the operating block 12 can rotate in the first direction D1 to the trigger position, and as Figure 20 and Figure 21 shown, the operating block 12 can rotate in the second direction D2 to the initial position.

[0097] Preferably, the injection head fixing structure 13 further includes a transmission device. The transmission device is respectively connected to the operating block 12 and the locking device 16. 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 be able to change the orientation of the locking device 16 when the operating block 12 rotates. That is to say, the orientation of the locking device 16 is different when the driving device is in the initial position and the trigger position.

[0098] As Figure 2 、 Figure 3 and Figure 5 shown, in one embodiment, the locking device 16 includes a plurality of locking blocks 17. 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 external gear 19 provided on the outer periphery of the locking block 17 and an internal gear 20 provided on the inner periphery of the operating block 12. The external gear 19 meshes with the internal gear 20. Thus, when the operating block 12 rotates, the rotational movement can be transmitted to the plurality of locking blocks 17 through the meshing of the external gear 19 and the internal 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. It can be understood that in other embodiments not shown, the locking device 16 may include other numbers of locking blocks 17, such as five or seven, etc.

[0099] Preferably, as Figure 3 and Figure 5 shown, the locking block 17 includes a main body portion 21 having a substantially cuboid shape and a round top portion 22 connected to the main body portion 21. The external gear 19 is provided on the outer periphery of the round top portion 22. Preferably, a small amount of external gear is also partially provided on the outer periphery of the main body portion 21.

[0100] As Figure 11 as well as Figure 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 longitudinal direction of the main body portion 21 is substantially consistent with the radial direction of the operating block 12. That is to say, the longitudinal direction of the main body portion 21 is arranged along the radial direction of the operating block 12, and the locking block 17 is in a state of "radially inwardly protruding". 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 plurality of locking blocks 17 enclose a first passage. As Figure 5 and Figure 27 shown, when the locking device 16 is in the unlocked position, the locking block 17 is arranged in a second orientation relative to the central axis of the operating block 12. When the locking block 17 is in the second orientation, the width direction of the main body portion 21 is substantially consistent with the radial direction of the operating block 12. That is to say, the width direction of the main body portion 21 is arranged along the radial direction of the operating block 12, and the locking block 17 is in a state of "radially outwardly retracted". 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 enclose a second passage.

[0101] 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.

[0102] In addition, as Figures 1 - 3 shown, the injection device 2 further includes a first end cap 70, and the middle of the first end cap 70 has an opening. The first end cap 70 is connected to the operating block 12 at one end of the operating block 12, and when the first end cap 70 is assembled on the operating block 12, it can cover the locking device 16 provided inside the operating block 12. The injection device 2 further includes a second end cap 72, and the second end cap 72 is connected to the other end of the housing 9 opposite to the opening portion 15.

[0103] As Figure 5 shown, during actual operation, before the injection head assembly 3 is intended to be assembled into the injection device 2, the locking device 16 can be first 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 the injection head assembly 3 can be assembled into the injection device 2 via the second passage. As Figures 9 - 11 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. Driven by the transmission device, the orientation of the locking device 16 changes, and the locking device 16 correspondingly moves to the locked position, and its radial inner edge forms a first passage in the injection head fixing structure 13.

[0104] 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.

[0105] In a preferred embodiment, Figure 1 and Figure 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.

[0106] Limit device

[0107] 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.

[0108] 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. Figure 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. Figure 12 and Figure 13In the injection device shown, the limiting device is also in the released state. At this time, the stop flange 34 has rotated a certain angle with the operation block 12.

[0109] Preferably, the limiting block 35 is rotatably connected to the opening 15 of the housing 9 via a fourth pivot 37. The fourth pivot 37 is provided between the first end and the second end opposite to the first end of the limiting block 35. Preferably, the limiting device 36 further includes an elastic member 38, and the elastic member 38 can be configured as a spring, and this spring can act on the first end of the limiting block 35 so that the first end abuts against a circumferential side of the stop flange 34 in the limiting state. It can be understood that at this time, the first end of the limiting block 35 is in a state of being pressed by the spring. Correspondingly, the second end of the limiting block 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 can press against the second end of the limiting block 35. Thus, the second end of the limiting block 35 "sinks" radially, and its first end correspondingly "tilts up" and moves away from the circumferential side of the stop flange 34, so that the rotation of the operation block 12 is no longer restricted and can smoothly rotate from the initial position to the trigger position. Correspondingly, the locking device 16 can move synchronously to the locking position.

[0110] In the illustrated preferred embodiment, the injection device 2 includes three groups of limiting devices 36, and the three groups of limiting devices 36 are evenly spaced on the opening 15 of the housing 9. It can be understood that in other embodiments not shown, the injection device 2 may also include other numbers of limiting devices, such as two groups or four groups, etc.

[0111] Engaging device

[0112] As Figure 3 and Figure 8 shown, the injection device 2 further includes an engaging device 11. The engaging device 11 is mainly used to engage the medicine storage body 5 on the injection head assembly 3 to the push rod 10 so that the medicine storage body 5 can move together with the push rod 10.

[0113] The engaging device 11 is connected to the push rod 10 and can move synchronously with the push rod 10. The engaging device 11 has an engaging position and a disengaging position. As Figure 10 and Figures 14 - 18 shown, when the engaging device 11 is in the engaging position, it can engage with the medicine storage body 5. Thus, the engaging device 11 can make the medicine storage body 5 move synchronously with the push rod 10. As Figure 19 and Figures 22 - 23As shown, when the engaging device 11 is in the disengaged position, the engagement with the medicine storage main body 5 can be disengaged, so that the medicine storage main body 5 can be freely removed from the injection device 2, and in this state, the medicine storage main body 5 can also be freely installed onto the injection device 2. When the injection head assembly 3 is to be installed onto the injection device 2 and a medicine suction or injection operation is intended, the engaging device 11 can be placed in the engaged position.

[0114] Preferably, the driving device described above is also linked with the engaging device 11. Among them, as Figure 4 , Figure 8 , Figure 19 and Figures 22 - 23 shown, when the driving device is in the initial position, the engaging device 11 is in the disengaged position. As Figure 10 and Figures 14 - 18 shown, when the driving device is in the trigger position, the engaging device 11 can be in the engaged position.

[0115] According to the above solution, the driving device can be 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 smooth entry of the injection head assembly 3 into 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 main body 4, and the engaging device 11 can be correspondingly in the engaged position and engage with the medicine storage main body 5. For the injection device 2 according to this solution, by driving one component of the driving device, both the locking device 16 and the engaging device 11 can respond simultaneously, the design is more compact and reasonable, and the cost can be reduced.

[0116] Preferably, as Figure 3 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 the first end and the second end opposite to the first end of the engaging device 11. The first end of the engaging device 11 is provided with an engaging portion 40. As Figure 10 and Figures 14 - 18 shown, when the engaging device 11 is in the engaged position, the engaging portion 40 is close to the central axis of the push rod 10. Correspondingly, the second end of the engaging device 11 is far from the central axis of the push rod 10. As Figure 19 and Figures 22 - 23 shown, when the engaging device 11 is in the disengaged position, the engaging portion 40 is far from the central axis of the push rod 10. Correspondingly, the second end of the engaging device 11 is close to the central axis of the push rod 10.

[0117] As Figure 4As shown, a long hole 41 is provided on the push rod 10, and the engaging device 11 is provided at the long hole 41. When the engaging device 11 is in the engaged position, the engaging portion 40 preferably extends through the long hole 41 into the interior of the push rod 10. When the engaging device 11 is in the disengaged position, the engaging portion 40 withdraws from the interior of the push rod 10.

[0118] As Figure 4 and Figure 8 shown, in a preferred embodiment, a holding structure 44 is provided on the driving device. The holding structure 44 is configured to hold the engaging portion 40 in the disengaged position when the driving device is in the initial position. By holding the engaging portion 40 in the disengaged position when the driving device is in the initial position, this solution facilitates the assembly of the injection head assembly 3 into the injection device 2.

[0119] Preferably, the holding structure 44 is configured as a planar holding plate provided on the inner side of the operation block 12. As Figure 3 and Figure 8 shown, a cam structure 45 is provided at the second end of the engaging device 11. The cam structure 45 is connected to the engaging portion 40. As Figure 4 and Figure 8 shown, when the operation block 12 is in the initial position, the holding structure 44 presses against the cam structure 45 along the direction towards the central axis of the push rod 10, causing the cam structure 45, that is, the second end of the engaging device 11, to rotate along the direction towards the central axis of the push rod 10. Correspondingly, the first end of the engaging device 11, that is, the engaging portion 40, rotates along the direction away from the central axis of the push rod 10. When the operation block 12 rotates to the trigger position, the holding structure 44 also moves away from the cam structure 45 as the operation block 12 rotates, thus no longer pressing against the cam structure 45. Correspondingly, the engaging portion 40 rotates along the direction towards the central axis of the push rod 10 under the action of the actuating device (described below).

[0120] In a preferred embodiment, as Figure 3 shown, the engaging device 11 further includes an actuating structure 46. The actuating structure 46 is configured to drive the engaging device 11 to rotate to the engaged position when the driving 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 engaging device 11. As described above, when the driving device is in the initial position, the first end of the engaging device 11 (that is, the engaging portion 40) is away from the central axis of the push rod 10, and at this time the elastic member is in a compressed state. When the driving device is in the trigger position, the second end of the engaging device 11 is no longer under pressure. Therefore, correspondingly, the first end of the engaging device 11 can rotate to the engaged position along the direction towards the central axis of the push rod 10 under the elastic force of the elastic member.

[0121] Preferably, as Figure 1 、Figure 3 and Figure 10 As shown in FIGS. and, a first toothed structure 42 is provided on the joint portion 40, and a second toothed structure 43 that cooperates with the first toothed structure 42 is provided on the outer periphery of the medicine storage body 5. When the joint device 11 is in the joint position, the first toothed structure 42 and the second toothed structure 43 are engaged to improve the cooperation strength between the joint device 11 and the medicine storage body 5.

[0122] Pusher locking structure

[0123] As Figure 2 and Figure 3 As shown in FIGS. and, the injection device 2 further includes a push rod locking structure 14. The push rod locking structure 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 be able to lock the push rod 10 when the push rod 10 moves to the second position. Since when the push rod is in the second position, the medicine suction is completed and the injection is about to be performed. At this time, by locking the position of the push rod 10 through the push rod locking structure 14, it can be held in the current position and its return to the first position under the action of the ejection device (described below) can be restricted to prevent misoperation.

[0124] Preferably, the push rod locking structure 14 includes a connecting rod 47. The connecting rod 47 has different positions when the push rod locking structure 14 is in the locked state and the unlocked state. Further, the first end of the connecting rod 47 is rotatably connected to the outside of the push rod 10 via a first pin shaft 62 and can move together with the push rod 10. The push rod locking structure 14 further includes a guide rail 48. The second end of the connecting rod 47 is slidably disposed in the guide rail 48 via a second pin shaft 63, so that the guide rail 48 can guide and define the movement path of the connecting rod 47. The second end is disposed opposite to the first end. Preferably, the injection device 2 further includes a handle portion 49 for the user to hold. The handle portion 49 is fixedly connected to one side of the housing 9, and the guide rail 48 is disposed in the handle portion 49.

[0125] As Figure 14 and Figure 15 As shown in FIGS. and, when the push rod 10 moves from the first position to the second position inside the housing 9, it can drive the synchronous movement of the first end of the connecting rod 47 connected thereto. 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 a linear movement away from the injection chamber to the second position along with the push rod 10 and a rotational movement about the connection point of the connecting rod 47 and the push rod 10 (that is, the first pin shaft 62).

[0126] Preferably, return to reference Figure 3, the guide rail 48 includes a first guide rail portion 50 and a second guide rail portion 51 communicating with the first guide rail portion 50. The extending 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, that is, 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 the direction towards the opening portion 15 at the critical position 52. Preferably, an obtuse angle is arranged between the second guide rail portion 51 and the first guide rail portion 50. As Figure 15 shown, when the push rod 10 moves to the second position, the operation 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.

[0127] Preferably, the push rod locking structure 14 further includes a first trigger mechanism 53. The first trigger mechanism 53 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 into 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. As Figure 15 and Figure 16 shown, during actual operation, the user can push the first trigger mechanism 53 along the direction towards 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 a linear displacement of the push rod 10. At this time, supported and blocked by the connecting rod 47, the push rod 10 cannot return from the second position to the first position, that is, the push rod 10 cannot move towards the injection cavity direction. Thus, the position of the push rod 10 is locked.

[0128] 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 along the direction towards the second guide rail portion 51 to make it enter the second guide rail portion 51.

[0129] Preferably, the push rod locking structure 14 further includes a second trigger mechanism 55. The second trigger mechanism 55 is connected to the opposite side of the handle portion 49 from the first trigger mechanism 53. The second trigger mechanism 55 is configured to be able to move the second end of the connecting rod 47 from the second guide rail 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 for injection operation. When the push rod 10 moves, the first end of the connecting rod 47 moves together with the push rod 10, while the second end of the connecting rod 47 slides in the first guide rail portion 50.

[0130] As Figure 16As shown, preferably, the connecting rod 47 further includes an extending end 56 which extends obliquely outward from the second end of the connecting rod 47 and has an arcuate outer contour. The second trigger mechanism 55 includes a rib 57 extending toward the first trigger mechanism 53, and the rib 57 has a pointed corner. Preferably, when the second end of the connecting rod 47 is in the second guide portion 51, the rib 57 abuts against the side of the extending end 56. As Figure 17 shown, when the second trigger mechanism 55 is actuated in the direction shown by the arrow in the figure, the rib 57 can push the extending end 56 against the side of the extending end 56 along the direction toward the first trigger mechanism 53, so that the second end of the connecting rod 47 can be pushed from the second guide portion 51 to the critical position 52.

[0131] According to the push rod locking structure of the above solution, the mutual collision between the locking elements in the prior art can be eliminated, which is beneficial to controlling the noise generated during the medicine sucking or injection operation.

[0132] In a preferred embodiment, as Figure 3 shown, the push rod locking structure 14 further includes an elastomer 58 which is arranged close to the second trigger mechanism 55 and can act on the second trigger mechanism 55. The arrangement of the elastomer 58 can help the second trigger mechanism 55 to return to its original position after acting. Preferably, an elastomer can also be arranged at the first trigger mechanism 53, and the elastomer can act on the first trigger mechanism 53 to make it return to its original position after acting.

[0133] Preferably, the injection device 2 further includes an ejection device which is configured to be able to apply a force toward the outside of the housing 9 to the injection head assembly 3 when the driving device is in the initial position. For example, when the injection operation is completed and it is intended to remove the injection head assembly 3 from the injection device 2, the driving device can be rotated to the initial position first. When the driving device is rotated to the initial position, the ejection device can eject the injection head assembly 3 outward. Preferably, as Figure 23 shown, the ejection device is configured as an elastic member 59, and the elastic member 59 is connected to one end of the push rod 10 far away from the opening 15.

[0134] The injection device 2 further includes a power device which is configured to be able to drive the push rod 10 to move from the first position to the second position for the operation of extracting the liquid medicine, and be able to drive the push rod 10 to move from the second position to the first position for the operation of injecting the liquid medicine.

[0135] In a preferred embodiment, the power device is an air pump (not shown). A sealed space is formed between the end of the push rod 10 far away from the opening 15 and the housing 9, as Figures 14 - 18As shown, a through hole 60 is provided on the housing 9, and the air pump is connected to the sealed space through the through hole 60. When it is desired to move the push rod from the first position to the second position, the air pump can extract air from the sealed space to form a negative pressure. When it is desired to move the push rod from the second position to the first position, the air pump can supply air to the sealed space.

[0136] The following takes the power device as an air pump as an example to describe in detail the medicine suction process and injection process of the injection system.

[0137] Step 1: Install the injection head assembly

[0138] In this step, as Figures 4 - 8 shown, it is necessary to first ensure that the driving device is in the initial position. Correspondingly, 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.

[0139] As Figures 9 - 13 shown, when the injection head assembly 3 is inserted in place in the injection device 2, the limiting device 36 is in the released state, enabling the driving device to smoothly rotate from the initial position to the trigger position, so that the locking device 16 is in the locked position, limiting the displacement of the injection head main body 4, and the engaging device 11 is in the engaged position, making the medicine storage main body 5 engage with the push rod 10. At this time, the ejecting device is in the compressed state.

[0140] Step 2: Extract the liquid medicine

[0141] In this step, as Figure 14 and Figure 15 shown, the push rod 10 drives the medicine storage main body 5 and the piston assembly 6 connected to the medicine storage main body 5 to move away from the injection micropore 8, realizing the extraction of the liquid medicine in the medicine storage cavity into the injection cavity 7. The way to drive the push rod 10 to move can be to extract 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.

[0142] As the push rod 10 moves, the connecting rod 47 connected to it moves together with the push rod 10, and the second end of the connecting rod 47 away from the push rod 10 will move along the guiding curve of the guide rail 48. When the push rod 10 moves to the extreme position (i.e., the second position) away from the injection micropore 8, 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). As Figure 16As shown, at this time, the first trigger mechanism 53 can be pushed. Under the pushing force of the first trigger mechanism 53, the connecting rod 47 can swing without linear displacement of the push rod 10, so that the second end of the connecting rod 47 moves from the critical position 52 to the second guide part 51. At this time, supported and obstructed by the connecting rod 47, the position of the push rod 10 is locked and cannot move in the direction of the injection micropore 8.

[0143] Step 3: Injection

[0144] Before the injection starts, gas can be pressed into the interior of the housing 9 through an air pump, thereby generating a pushing force on the push rod 10. At this time, due to the locking effect of the connecting rod 47, the push rod 10 cannot move towards the injection micropore 8 by itself. As Figure 17 shown, at this time, the second trigger mechanism 55 can be pushed in the direction of the arrow shown in the figure, so that it pushes the second end of the connecting rod 47 to move along the guide rail from the second guide part 51 to the critical position 52. 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. Therefore, as Figure 18 shown, the push rod 10 will push the medicine storage main body 5 and the piston assembly 6 to eject the liquid medicine inside the injection cavity.

[0145] Step 4: Remove the injection cavity

[0146] After the injection is completed, the driving device can be operated to rotate from the trigger position to the initial position. Figures 19 - 22 shows the state where the driving device has been operated but the injection head assembly 3 has not been ejected by the ejecting device yet. In response to this 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. Figures 23 - 25 shows the state where the injection head assembly 3 has been ejected by the ejecting 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 unlocked position, and the engaging device 11 is in the disengaged position.

[0147] According to the injection device 2 and the injection system 1 of the present invention, the driving device can simultaneously achieve linkage with both the locking device 16 and the engaging device 11, so that by operating the driving device, both the locking device 16 and the engaging device 11 can respond. This solution can place the driving device in the initial position before the injection head assembly 3 is placed on 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 smooth entry of the injection head assembly 3 into the injection device 2. 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 medicine storage body 5, thereby facilitating the medicine suction operation and the injection operation. The injection device 2 of this solution is more compact in design and can reduce costs.

[0148] Embodiment 2

[0149] The following refers to Figures 29 - 32 The injection device according to the second preferred embodiment of the present invention will be 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. Therefore, for the sake of brevity, only the differences will be described in detail herein.

[0150] As Figures 29 - 32 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 operation block 12'. The first end of the locking rod 24 is rotatably connected to the housing 9' via a first rotating shaft 25. In the present embodiment, the transmission device includes a connecting rod 26. 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 operation block 12' via a third rotating shaft 28. Thus, when the operation block 12' rotates, its movement 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.

[0151] Preferably, the number of the connecting rods 26 is the same as the number of the locking rods 24. In the illustrated embodiment, both the number of the connecting rods 26 and the number of the locking rods 24 is 3. It can be understood that in other embodiments not shown, those skilled in the art can also set other numbers of connecting rods and locking rods according to needs. The connecting rod 26 is generally constructed as a straight rod. The locking rod 24 is generally constructed as an arc-shaped rod, and its arc is generally matched with the arc of the operation block 12', so that when the locking device 16' is in the unlocked position, it can cooperatively abut against the inner circumference of the operation block 12'. As Figure 31As shown, a plurality of locking rods 24 are abutted end to end with each other in the circumferential direction of the operation block 12'. Preferably, the length of the connecting rod 26 is shorter than the length of the locking rod 24.

[0152] Continue to refer to Figure 31 and Figure 32 As shown in FIGS. and, a first boss portion 29 protruding radially inward is provided on the inner circumference of the operation block 12' at the third rotating shaft 28 where the connecting rod 26 is provided. A second boss portion 30 protruding radially outward and a groove portion 31 adjacent to the second boss portion 30 are provided on the side surface of the second end of the locking rod 24 facing the operation block 12'. As shown in Figure 31 As shown in FIGS., when the locking device 16' is in the unlocked position, the locking rod 24 is oriented such that the first boss portion 29 engages in the groove portion 31. As shown in Figure 32 As shown in FIGS., when the operation block 12' rotates from the initial position to the trigger position, the second end of the locking rod 24 rotates radially inward along the operation block 12' under the drive of the connecting rod 26, so that the first boss portion 29 abuts against the second boss portion 30 in the radial direction of the operation block 12', so that the radial inner edge of the locking rod 24 is closer to the central axis of the push rod.

[0153] As shown in Figure 32 As shown in FIGS., when the locking device 16' is in the locked position, the locking rod 24 is arranged in a first orientation relative to the central axis of the operation 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 state of "radially inwardly protruding", and the radial inner edges of the plurality of locking rods 24 enclose a first passage. As shown in Figure 31 As shown in FIGS., when the locking device 16' is in the unlocked position, the locking rod 24 is arranged in a second orientation relative to the central axis of the operation 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 state of "radially outwardly retracted", and the radial inner edges of the plurality of locking rods 24 enclose 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 the locking rod 24 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 the locking rod 24 is in the unlocked position.

[0154] When the locking device 16' is in the locked position, the radial inner edge of the locking rod 24 (especially the second end of the locking rod 24) can extend into the recess 23 of the injection head body 4 to cooperate with it, so as to limit the position of the injection head body 4 and prevent it from moving.

[0155] As shown in Figure 31 and Figure 32As shown, preferably, the first end of the locking lever 24 is provided with an arcuate convex portion 32, and the second end of the locking lever 24 is provided with an arcuate concave portion 33. When the locking device 16' is in the locked position, the convex portion 32 of the locking lever 24 can be exactly engaged in the concave portion 33 of another locking lever 24 adjacent to the locking lever 24.

[0156] Embodiment 3

[0157] Reference is made below Figures 33 - 34 to a detailed description of an injection device according to a third preferred embodiment of the present invention. 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. Therefore, for the sake of brevity, only the differences will be described in detail herein.

[0158] As Figure 33 and Figure 34 shown, the power device is configured as an elastic element 61 disposed between the housing 9' and the end of the push rod 10' remote from the opening 15'. In the present embodiment, a pushing portion 71 extending to the outside of the housing 9' is further provided on the push rod 10', and the pushing portion 71 can be operated by the user. In actual use, the user can hold by hand or use a tool to drive the pushing portion 71 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' to suck the liquid medicine from the medicine storage body 5' into the injection chamber 7' via the piston assembly 6', completing the extraction of the liquid medicine. At this time, the elastic element 61 is in a compressed state. When the extraction of the liquid medicine is completed and an injection operation is intended, with the push rod locking structure 14' in the unlocked state, the elastic element 61 can automatically spring open to push the push rod 10' from the second position to the first position, causing the liquid medicine in the injection chamber 7' to be ejected.

[0159] In the present embodiment, the mating features such as protrusions, grooves, flanges, and buckles in each mating structure group provided can be structures extending in the circumferential direction and intermittently provided, or structures continuously provided in the circumferential direction, and the injection device can make corresponding structural adjustments.

[0160] In addition, although the embodiments of the present invention are exemplified by a needleless syringe, the structure of the present invention can also be applied to a needle syringe.

[0161] The above description of various embodiments of the present invention is provided for the purpose of description to a person of ordinary skill in the relevant art. It is not intended to exclude or limit the present invention to a single disclosed embodiment. As above, those of ordinary skill in the art taught above will understand various alternatives and variations of the present invention. Thus, while some alternative embodiments have been specifically described, those of ordinary skill in the art will understand or relatively easily develop other embodiments. The present invention is intended to embrace all alternatives, 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 in conjunction with an injection head assembly, the injection head assembly including an injection head body, a medicine storage body, and a piston assembly, the piston assembly being connected to the medicine storage body and configured to be able to move synchronously with the medicine storage body, an injection cavity being provided in the injection head body, the piston assembly being configured to be able to move within the injection cavity, the piston assembly being able to communicate the medicine storage body and the injection cavity, characterized in that, The injection device comprises: a housing having an opening; a push rod disposed in the housing, the push rod being configured to be movable between a first position close to the opening and a second position away from the opening, the push rod being configured to allow at least a part of the medicine storage body to enter; an engaging device rotatably connected to the push rod via a pivot shaft, a first end of the engaging device having an engaging portion, the engaging device having an engaging position and a disengaging position, when the engaging device is in the engaging position, the engaging portion is close to the central axis of the push rod and can be engaged with the medicine storage body, when the engaging device is in the disengaging position, the engaging portion is away from the central axis of the push rod; an injection head fixing structure connected to the opening of the housing, the injection head fixing structure including a locking device having a locking position and an unlocking position, when the locking device is in the locking position, it can lock the position of the injection head body; and a driving device configured to be interlocked with the locking device and the engaging device, the driving device having an initial position and a trigger position, wherein when the driving device is in the initial position, the locking device is in the unlocking position and the engaging device is in the disengaging position, when the driving device is in the trigger position, the locking device is in the locking position and the engaging device is in the engaging position.

2. The injection device according to claim 1, characterized in that, The driving device is configured as an annular operating block, the operating block being engaged with the opening of the housing, the operating block being configured to be rotatable between the initial position and the trigger position relative to the housing in a first direction and a second direction opposite to the first direction, wherein the operating block can be rotated in the first direction to the trigger position and can be rotated in the second direction to the initial position.

3. The injection device according to claim 2, characterized in that, A long hole is provided on the push rod, the engaging device is disposed at the long hole, when the engaging device is in the engaging position, the engaging portion extends through the long hole into the interior of the push rod, when the engaging device is in the disengaging position, the engaging portion is away from the interior of the push rod.

4. The injection device according to claim 1, characterized in that, The engaging portion is provided with a first toothed structure.

5. The injection device according to claim 2, characterized in that, The pivot shaft is disposed between a first end and a second end opposite to the first end of the engaging device.

6. The injection device according to claim 5, characterized in that A holding structure is provided on the driving device, the holding structure being configured to hold the engaging portion in the disengaging position when the driving device is in the initial position.

7. The injection device according to claim 6, characterized in that, The holding structure is disposed on the inner side of the operating block, a cam structure is provided at a second end of the engaging device, when the driving device is in the initial position, the holding structure presses against the cam structure in a direction towards the central axis of the push rod, so that the second end of the engaging device rotates in a direction towards the central axis of the push rod, when the driving device is in the trigger position, the holding structure is away from the cam structure.

8. The injection device according to claim 7, characterized in that, The engaging device further includes an actuating structure configured to drive the engaging device to rotate to the engaging position when the driving device is in the triggering position.

9. The injection device according to claim 8, characterized in that, The actuating structure is configured as an elastic member that can act on the first end of the engaging device.

10. The injection device according to claim 2, characterized in that, When the locking device is in the locking position, the radially inner edge of the locking device forms a first passage in the injection head fixing structure. When the locking device is in the unlocking position, the radially inner edge of the locking device forms a second passage in the injection head fixing structure for the injection head body to pass through, and the cross-sectional area of the first passage is smaller than that of the second passage.

11. The injection device according to claim 10, characterized in that, The injection head fixing structure further includes a transmission device that is respectively connected to the operating block and the locking device, and the transmission device is configured to be able to change the orientation of the locking device when the operating block rotates.

12. The injection device according to claim 11, characterized in that, The locking device includes a locking block that is rotatably connected to the housing via a pivot. The transmission device includes an external gear provided on the outer periphery of the locking block and an internal gear provided on the inner periphery of the operating block, and the external gear meshes with the internal gear.

13. The injection device according to claim 12, characterized in that, The locking device includes a plurality of locking blocks that are evenly spaced along the circumferential direction of the operating block.

14. The injection device according to claim 12, characterized in that, The locking block includes a main body portion that is generally rectangular parallelepiped-shaped and a rounded top portion connected to the main body portion, and the external gear is provided on the rounded top portion.

15. The injection device according to claim 14, 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. 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 portion is substantially consistent with the radial direction of the operating block. When the locking block is in the second orientation, the width direction of the main body portion is substantially consistent with the radial direction of the operating block.

16. The injection device according to claim 11, 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.

17. The injection device according to claim 16, characterized in that, A first boss portion is provided on the inner periphery of the operating block at the third rotating shaft. A second boss portion and a groove portion adjacent to the second boss portion are provided on the side surface of the second end of the locking rod facing the operating block. When the locking device is in the unlocking position, the orientation of the locking rod is set such that the first boss portion engages in the groove portion. When the locking device is in the locking position, the orientation of the locking rod is set such that the first boss portion abuts against the second boss portion along the radial direction of the operating block.

18. The injection device according to claim 16, 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 generally configured to be arc-shaped, and the plurality of locking rods abut against each other end to end in the circumferential direction of the operating block.

19. The injection device according to claim 18, 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 locked position, the convex portion of the locking rod engages in the concave portion of another locking rod adjacent to the locking rod.

20. The injection device according to claim 2, characterized in that, The injection device further includes a limiting device having a limiting state and a released state, and the limiting device is configured to be able to limit the rotation of the operation block in the first direction in the limiting state.

21. The injection device according to claim 20, characterized in that, A radially inwardly protruding stop flange is provided on the inner circumference of the operation block. The limiting device includes a limiting block connected to the opening of the housing and disposed inside the operation block. When the limiting device is in the limiting state, the first end of the limiting block abuts against the stop flange from a circumferential side of the stop flange. When the limiting device is in the released state, the first end of the limiting block is away from the stop flange.

22. The injection device according to claim 21, characterized in that, The limiting block is rotatably connected to the opening of the housing via a fourth pivot shaft, and the fourth pivot shaft is provided between the first end and the second end opposite to the first end of the limiting block.

23. The injection device according to claim 21, characterized in that, The limiting device further includes an elastic member configured to be able to act on the first end of the limiting block so that the first end abuts against the stop flange in the limiting state.

24. The injection device according to claim 1, wherein, The injection device further includes a push rod locking structure connected to the push rod. The push rod locking structure has a locked state and an unlocked state, and the push rod locking structure is configured to be able to lock the position of the push rod when in the locked state and unlock the position of the push rod when in the unlocked state.

25. The injection device according to claim 24, characterized in that, The push rod locking structure includes a connecting rod. The first end of the connecting rod is rotatably connected to the push rod and can move together with the push rod. The push rod locking structure further includes a guide rail. The second end of the connecting rod is slidably disposed in the guide rail, and the second end is disposed opposite to the first end.

26. The injection device according to claim 25, characterized in that, The injection device further includes a handle portion connected to one side of the housing, and the guide rail is provided on the handle portion.

27. The injection device according to claim 26, characterized in that, The guide rail includes a first guide rail portion and a second guide rail portion communicating with the first guide rail portion. The extending direction of the first guide rail portion is substantially perpendicular to the central axis of the push rod. The second guide rail portion is inclined in a direction toward the opening portion relative to the first guide rail portion at a critical position. When the push rod moves to the second position, the second end of the connecting rod moves from the first guide rail portion to the critical position.

28. The injection device according to claim 27, characterized in that, An obtuse angle is arranged between the second guide rail portion and the first guide rail portion.

29. The injection device according to claim 27, characterized in that, The push rod locking structure further includes a first triggering mechanism connected to the handle portion. The first triggering mechanism is configured to be able to push the second end of the connecting rod from the critical position into the second guide rail portion. When the second end of the connecting rod is in the second guide rail portion, the connecting rod is in the locked state.

30. The injection device according to claim 29, characterized in that, The first triggering mechanism includes an arcuate protruding portion configured to be able to press against the second end of the connecting rod.

31. The injection device according to claim 29, characterized in that, The push rod locking structure further includes a second triggering mechanism, which is connected to the handle portion and is configured to be able to move the second end of the connecting rod from the second guide portion to the critical position. When the second end of the connecting rod moves from the second guide portion to the critical position, the connecting rod is in an unlocked state.

32. The injection device according to claim 31, characterized in that, The connecting rod further includes an extension end, which extends obliquely outward from the second end of the connecting rod. The second triggering mechanism is configured to be able to actuate the extension end to push the second end of the connecting rod from the second guide portion to the critical position.

33. The injection device according to claim 32, characterized in that, The second triggering mechanism includes a rib extending toward the first triggering mechanism. The extension end has an arcuate outer contour. When the second end of the connecting rod is in the second guide portion, the rib abuts against the extension end.

34. The injection device according to claim 31, characterized in that, The push rod locking structure further includes an elastic body, which is arranged near the first triggering mechanism or the second triggering mechanism and can act on the first triggering mechanism or the second triggering mechanism.

35. The injection device according to claim 1, characterized in that, The injection device further includes an ejection device, which is configured to be able to apply a force toward the outside of the housing to the injection head assembly when the driving device is in the initial position.

36. The injection device according to claim 35, characterized in that, The ejection device is configured as an elastic member, and the elastic member is arranged at one end of the push rod away from the opening portion.

37. The injection device according to claim 1, characterized in that, The injection device further includes a power device, which is configured to be able to drive the push rod to move from the first position to the second position, and / or drive the push rod to move from the second position to the first position.

38. The injection device according to claim 37, characterized in that, The power device is an air pump. A sealed space is formed between the end of the push rod away from the opening portion and the housing. A through hole is provided on the housing, and the air pump is communicated with the sealed space through the through hole.

39. The injection device according to claim 37, characterized in that, The power device is an elastic element arranged between the housing and the end of the push rod away from the opening portion.

40. An injection system, characterized in that, The injection system includes: An injection head assembly, which includes an injection head body, a medicine storage body and a piston assembly. The piston assembly is connected to the medicine storage body and is configured to be able to move synchronously with the medicine storage body. An injection cavity is provided in the injection head body. The piston assembly is configured to be able to move in the injection cavity, and the piston assembly can communicate the medicine storage body and the injection cavity; and The injection device according to any one of claims 1-39, wherein the driving device is configured to be able to be in the initial position before the injection head assembly is installed on the injection device, and in the triggering position after the injection head assembly is installed on the injection device.

41. The injection system according to claim 40, characterized in that, The engaging device has an engaging portion, and a first toothed structure is provided on the engaging portion. A second toothed structure that can cooperate with the first toothed structure is provided on the outer periphery of the medicine storage body.

42. The injection system according to claim 40, 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 part of the radially inner edge of the locking device extends into the recessed structure.

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