Injection assembly and injection system

Abstract

The present invention provides an injection assembly and an injection system. The injection assembly includes an injection head body, a piston assembly, and an operating handle. An injection cavity is provided in the injection head body. The piston assembly is movably disposed in the injection cavity. The operating handle is connected to the piston assembly, and the operating handle is configured to be movable relative to the injection head body along the axial direction of the injection head body and to automatically stop moving when moved to a predetermined position. The injection assembly according to the present invention can achieve rapid and accurate extraction of a fixed dose of liquid medicine.

Description

Technical Field

[0001] The present invention relates to the field of medical devices, particularly to the field of needleless injection. More specifically, the present invention relates to an injection assembly and an injection system including the injection assembly. Background Art

[0002] When performing a medicine-taking operation with an existing syringe, the piston rod is usually manually pulled to suck the liquid medicine in the medicine storage bottle into the injection cavity through the needle. The dose of the sucked liquid medicine needs to be judged by the operator manually reading the scale printed on the outer wall of the injection cavity. This method usually has errors, thus having a certain impact on accurately controlling the medicine-taking dose.

[0003] Therefore, there is a need to provide an injection assembly and an injection system including the injection assembly to at least partially solve the above problems. Summary of the Invention

[0004] On the one hand, the present invention provides an injection assembly, which includes:

[0005] An injection head body, in which an injection cavity is provided;

[0006] A piston assembly, which is movably arranged in the injection cavity; and

[0007] An operation handle, which is connected to the piston assembly. The operation handle is configured to be able to move relative to the injection head body along the axial direction of the injection head body and to automatically stop moving when moving to a predetermined position.

[0008] Preferably, the operation handle is detachably connected to the piston assembly.

[0009] Preferably, the operation handle is detachably connected to the injection head body.

[0010] Preferably, the operation handle includes a housing part and an engaging part arranged inside the housing part. The housing part is configured to be cylindrical, and the engaging part is also configured to be cylindrical and is concentrically arranged with the housing part. The housing part is sleeved outside the injection head body. The injection head body has an opening part. The engaging part extends into the injection head body through the opening part and is detachably connected to the piston assembly.

[0011] Preferably, the engaging part is provided with a snap structure, and the piston assembly includes a piston and a base connected to the piston. The base is provided with a slot structure cooperating with the snap structure.

[0012] Preferably, the joint portion includes a support portion and a plurality of axially extending rods that are connected to the support portion and extend from the support portion in a direction toward the piston assembly. The support portion is configured as a hollow cylinder, and the support portion is connected to an end of the operating handle. The plurality of axially extending rods are spaced apart from each other in the circumferential direction of the joint portion and have a gap between adjacent axially extending rods. Each axially extending rod includes the snap structure.

[0013] Preferably, a plurality of protrusions corresponding to the number and positions of the plurality of axially extending rods are provided on the inner circumference of the opening portion. The protrusions are configured to be able to abut against the axially extending rods on the radially outer sides of the axially extending rods when the operating handle drives the piston to move axially.

[0014] Preferably, the injection assembly further includes a limiting structure configured to be able to limit the rotation of the operating handle relative to the injection head body in a predetermined state.

[0015] Preferably, a first flange portion is provided on the injection head body near the opening portion. One of the first flange portion and the housing portion is provided with a first protrusion, and the other of the first flange portion and the housing portion is provided with a first groove that mates with the first protrusion. The first protrusion and the first groove together form a set of the limiting structures.

[0016] Preferably, the injection assembly includes two sets of the limiting structures that are symmetrically arranged with respect to the central axis of the injection head body.

[0017] Preferably, the first groove is provided on the first flange portion, and the first protrusion is provided on the inner surface of the housing portion and has a predetermined length in the axial direction of the housing portion. The predetermined length of the first protrusion is set such that the first protrusion can remain engaged in the first groove before the operating handle moves to the predetermined position, and the first protrusion disengages from the first groove when the operating handle moves to the predetermined position.

[0018] Preferably, the injection assembly further includes a stopping structure configured to be able to limit the further axial movement of the operating handle relative to the injection head body when the operating handle moves relative to the injection head body to the predetermined position.

[0019] Preferably, a second protrusion is further provided on the outer shell portion, and the injection head body further includes a second flange portion. The second flange portion is spaced apart from the first flange portion in the axial direction of the injection head body. A stop disk extending a predetermined distance along its circumferential direction is provided on the second flange portion. The stop disk is recessed in the axial direction of the second flange portion along the direction towards the opening portion. The stop disk is configured to be able to block the axial movement of the second protrusion. The second protrusion and the stop disk together constitute a set of the stop structures.

[0020] Preferably, the injection assembly includes two sets of the stop structures symmetrically arranged with respect to the central axis of the injection head body.

[0021] Preferably, a second groove is further provided on the second flange portion. The second groove communicates with the recessed portion of the stop disk. The position of the second groove corresponds to the position of the first groove. The second groove is configured to be able to cooperate with the first protrusion.

[0022] Preferably, the second protrusion is configured to be able to cooperate with the first groove and the second groove.

[0023] Preferably, the second protrusion is spaced apart from the first protrusion both in the axial direction and the circumferential direction of the outer shell portion.

[0024] Preferably, the shortest axial distance between the first protrusion and the second protrusion is substantially equal to the distance between the top surface of the stop disk and the bottom surface of the first flange portion, and / or the circumferential length between the first protrusion and the second protrusion is substantially equal to the circumferential length of the stop disk.

[0025] Preferably, the injection assembly further includes a housing assembly, and the housing assembly includes:

[0026] A housing main body having an open end and an engaging end opposite to the open end. The open end can allow a medicine storage bottle to enter the housing main body, and the engaging end is engaged with the injection head body;

[0027] A medicine taking needle provided inside the housing main body. A medicine taking passage capable of communicating the outside and the injection cavity is provided in the medicine taking needle.

[0028] Preferably, the housing assembly further includes an elastic gasket provided in the housing main body. The elastic gasket is arranged closer to the injection head body than the medicine taking needle. A first through hole communicating with the medicine taking passage is provided on the elastic gasket.

[0029] Preferably, an air passage is further provided in the medicine taking needle. The air passage and the medicine taking passage are provided independently of each other.

[0030] Preferably, a second through hole communicating with the air passage is provided on the elastic gasket.

[0031] Preferably, a plurality of blocking ribs are provided on the inner side wall of the housing body. The plurality of blocking ribs are spaced apart in the circumferential direction of the housing body, and the plurality of blocking ribs are configured to abut against the medicine-taking needle from the side facing the open end of the medicine-taking needle when the medicine-taking needle is placed inside the housing body.

[0032] Preferably, injection micropores are provided on the injection head body. The injection micropores are provided at the first end of the injection head body, and the first end is joined to the joining end of the housing body. The injection micropores communicate with the medicine-taking passage through the first through hole.

[0033] Preferably, a first snap portion is provided on the side of the joining end facing the injection micropores, and a circumferential snap flange is provided at the first end. The snap flange is configured to be snap-connected to the first snap portion.

[0034] Preferably, a first positioning port is provided on the joining end, and a positioning flange is provided on the elastic gasket. A part of the positioning flange extends into the first positioning port, and the first through hole is opened on the positioning flange.

[0035] On the other hand, the present invention also provides an injection system, including:

[0036] The injection assembly as described in any one of the above, with injection micropores provided at one end of the injection head body; and

[0037] A pushing device, which includes a housing and a push rod provided inside the housing. The push rod is movably provided in the housing. At least a part of the injection head body can be joined in the housing, and the push rod is configured to be able to contact or engage with the piston assembly to push the piston assembly in the direction towards the injection micropores.

[0038] Preferably, the pushing device further includes a locking mechanism. The housing has an open end, and the locking mechanism is provided at the open end. The locking mechanism is movable between a locked position and an unlocked position.

[0039] Wherein when the locking mechanism is in the locked position, the locking mechanism forms a first passage path in the open end. When the locking mechanism is in the unlocked position, the locking mechanism forms a second passage path in the open end for the injection head body to pass through. The cross-sectional area of the first passage path is smaller than the cross-sectional area of the second passage path.

[0040] According to the injection assembly and injection system of the present invention, when the operating handle moves to a predetermined position, it automatically stops moving. At this time, the liquid medicine drawn inside the injection chamber also reaches a preset value accordingly. The above solution can achieve the extraction of a fixed dose of liquid medicine by setting the limit position of the operating handle, so that a fixed dose of liquid medicine can be quickly and accurately extracted each time the liquid medicine is extracted.

[0041] In addition, the injection assembly according to the present invention utilizes the interlocking structure of the injection chamber body and the operating handle, which can enable the operating handle to be smoothly separated from the piston, avoiding affecting the amount of medicine taken due to changing the position of the piston. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order 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 accompanying 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.

[0043] Figure 1 Stereoscopic schematic diagram of the injection assembly according to the first preferred embodiment of the present invention;

[0044] Figure 2 For Figure 1 exploded schematic diagram of the injection assembly in

[0045] Figure 3 For Figure 1 another stereoscopic schematic diagram of the injection assembly in Figure 1 but with the up-down direction in the drawing opposite to that in

[0046] Figure 4 For Figure 3 exploded schematic diagram of the injection assembly in

[0047] Figure 5 For Figure 1 cross-sectional schematic diagram of the injection assembly shown in

[0048] Figure 6 For Figure 1 cross-sectional schematic diagram of the injection assembly shown in

[0049] Figure 7 For Figure 1 stereoscopic schematic diagram of the medicine-taking needle of the injection assembly shown in

[0050] Figure 8 For Figure 6Schematic cross-sectional view of the medicine-taking needle shown therein;

[0051] Figure 9 Is a three-dimensional schematic view of the medicine-taking needle of the injection assembly according to another preferred embodiment;

[0052] Figure 10 Is Figure 9 Schematic cross-sectional view of the medicine-taking needle shown therein;

[0053] Figure 11 Is a three-dimensional schematic view of the medicine-taking needle of the injection assembly according to another preferred embodiment;

[0054] Figure 12 Is Figure 11 Schematic cross-sectional view of the medicine-taking needle shown therein;

[0055] Figure 13 Is Figures 11 - 12 Schematic view of the medicine-taking needle shown when combined with the medicine storage bottle;

[0056] Figure 14 And Figure 15 Is Figure 1 Schematic cross-sectional view of the injection assembly shown, respectively showing different stages of medicine extraction;

[0057] Figure 16 Is Figure 1 Schematic view of the injection assembly shown, wherein the injection assembly is cut open to clearly show its internal structure;

[0058] Figure 17 Is Figure 1 Three-dimensional schematic view of the injection head body of the injection assembly shown;

[0059] Figure 18 Is Figure 14 Partial enlarged schematic view of part A shown therein;

[0060] Figure 19 And Figure 20 Is Figure 1 Schematic cross-sectional view of the injection assembly shown, respectively showing the state where the operating handle is rotated and the state where it is removed after the medicine extraction is completed;

[0061] Figure 21 And Figure 22 Are respectively Figure 1 Schematic cross-sectional views of the injection assembly before and after the operating handle is rotated, wherein the operating handle is cut open to clearly show its internal structure;

[0062] Figures 23 - 25 Respectively show schematic views of the injection system according to the first preferred embodiment of the present invention in different states;

[0063] Figure 26 Schematic perspective view of an injection assembly according to a second preferred embodiment of the present invention;

[0064] Figure 27 is Figure 26 exploded view of the injection assembly in

[0065] Figure 28 is Figure 26 further exploded perspective view of the injection assembly in

[0066] Figure 29 is Figure 26 cross-sectional view of the injection assembly shown in , showing the medicine storage bottle to be placed in the injection assembly;

[0067] Figure 30 is Figure 26 cross-sectional view of the injection assembly shown in , showing the medicine storage bottle already placed in place in the injection assembly;

[0068] Figures 31 - 33 is Figure 26 cross-sectional view of the injection assembly shown in , respectively showing different liquid medicine extraction stages; and

[0069] Figure 34 and Figure 35 are respectively Figure 26 schematic views of the injection assembly at different stages of injection shown in . Detailed Embodiment

[0070] Next, an injection assembly according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. What is given below is only the preferred embodiment according to the present invention, and those skilled in the art can think of other ways to implement the present invention on the basis of the preferred embodiment, and other ways also fall within the scope of the present invention.

[0071] The present invention provides an injection assembly and an injection system. 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 Figure 6 or parallel to the X-X direction in Figure 6 ; 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 generally equivalent to the "circumferential direction".

[0072] Figures 1 - 35An injection assembly and an injection system including the injection assembly according to some preferred embodiments of the present invention are shown. Although Figures 1 - 35 taking a needle-free injection assembly as an example, it can be understood that the present invention can be applied to a needle injection assembly. The injection assembly of the present invention can accurately suck the liquid to be injected into the injection cavity in the injection head body (i.e., the drug suction step described hereinafter), and achieve accurate determination of the injection dose. Such an injection assembly can adopt both needle-free injection and needle injection methods. Further, the injection assembly of the present invention can also realize the switching between needle and needle-free injection methods. For example, by installing an injection needle on the injection micropores of the injection head body, the injection method of the syringe can be switched from needle-free injection to needle injection.

[0073] Embodiment 1

[0074] The following refers to Figures 1 - 25 to describe in detail the injection assembly and injection system according to the first preferred embodiment of the present invention.

[0075] As Figures 1 - 5 shown, the injection assembly 1 generally includes an injection head body 2, a piston assembly 3, a housing assembly 4, and an operation handle 5. The injection head body 2 is generally constructed in a cylindrical shape, and has an injection cavity 7 inside. An injection micropore 6 communicating the injection cavity 7 with the outside is provided at the end of the injection head body 2. When an injection operation is intended, the injection head body 2 can be pressed against the injection site, such as the skin of a patient. When the injection operation (described hereinafter) is triggered, the liquid medicine in the injection cavity can be injected into the patient's body through the injection micropore 6. The piston assembly 3 is movably disposed in the injection cavity 7. The operation handle 5 is connected to the piston assembly 3 and can drive the piston assembly 3 to move in the injection cavity 7. The housing assembly 4 is connected to the injection head body 2, and the housing assembly 4 is for placing a medicine storage bottle 8 therein. Each component will be described in detail hereinafter.

[0076] Housing assembly 4

[0077] As Figures 1 - 4 shown, the housing assembly 4 includes a housing body 9, a medicine-taking needle 10, and an elastic gasket 11. The housing body 9 is generally cylindrical, and its inner diameter is slightly larger than the outer diameter of a conventional medicine storage bottle (such as a vial or a cartridge, etc.), and the medicine storage bottle 8 can be placed therein. The housing body 9 has an open end 12 and a joint end 13 opposite to the open end 12. The medicine storage bottle 8 can enter the housing body 9 through the open end 12. The joint end 13 can be used to engage with the injection head body 2.

[0078] The medicine-taking needle 10 can be engaged inside the housing body 9. As Figure 7 and Figure 8As shown, the medicine-taking needle 10 includes a needle rod 14 and a medicine-taking passage 15 formed in the needle rod 14. The medicine-taking passage 15 can communicate with the outside and the injection cavity 7 so that the taken medicine liquid can enter the injection cavity 7. One end of the medicine-taking passage 15 has a medicine-taking port 16 communicating therewith. As Figure 2 and Figure 4 shown, the medicine-taking needle 10 further includes a base 17 connected to the needle rod 14. The base 17 is generally constructed in a disc shape and is connected to the end of the needle rod 14 opposite to the needle tip. The medicine-taking needle 10 can be placed at the engaging end 13 of the housing body 9 via the base 17. When the medicine-taking needle 10 is properly placed inside the housing body 9, the needle tip faces the open end 12 of the housing body 9. Thus, when the medicine storage bottle 8 is placed into the housing body 9, the needle tip can pierce the sealing plug on the medicine storage bottle 8, so that the medicine liquid in the medicine storage bottle can enter the injection cavity 7 via the medicine-taking port 16 and the medicine-taking passage 15.

[0079] Since the medicine storage bottle 8 is usually placed in an inverted vertical state when extracting the medicine liquid from it, as Figure 5 and Figure 6 shown, in order to facilitate the medicine liquid in the medicine storage bottle 8 to be fully sucked into the injection cavity 7, preferably, the medicine-taking port 16 is opened on the side of the needle rod 14 away from the needle tip, that is, Figure 5 and Figure 6 the lower end of the medicine-taking needle 10 shown in. This solution can reduce the residual medicine liquid in the medicine storage bottle 8 when extracting the medicine liquid.

[0080] Preferably, as Figures 7 - 10 shown, an air passage 18 is further provided in the medicine-taking needle 10. The air passage 18 and the medicine-taking passage 15 are provided independently of each other. By providing the air passage 18, air can enter the medicine storage bottle during the process of extracting the medicine liquid, thereby avoiding the formation of a vacuum inside the medicine storage bottle 8 during the process of extracting the medicine liquid and affecting the medicine-taking effect. This solution is particularly applicable to medicine storage bottles whose internal volume does not change as the internal medicine liquid is extracted, such as vials. The outlet of the air passage 18 can be opened at the needle tip end of the needle rod 14, so the air passage 18 is longer than the medicine-taking passage 15. The outlet of the air passage 18 can be on the same side as the medicine-taking port 16, as Figure 7 and Figure 8 shown. In another embodiment, the outlet of the air passage 18 can also be on a different side from the medicine-taking port 16, as Figure 9 and Figure 10 shown, and those skilled in the art can set it according to actual needs.

[0081] For medicine storage bottles whose internal volume decreases as the amount of medicine decreases, such as cartridge bottles, the air passage can be omitted in the medicine-taking needle 10, as Figure 11 and Figure 12 shown.

[0082] As is well known, the sealing plug 19 of the medicine storage bottle 8 is usually made of an elastic material to facilitate the puncturing of the sealing plug 19 by the medicine taking needle 10 to enter the medicine storage cavity for taking medicine. Due to the frictional force between the sealing plug 19 and the medicine taking needle 10, when the medicine taking needle 10 punctures the sealing plug 19, the part of the sealing plug 19 in contact with the medicine taking needle 10 will deform and bulge towards the inside of the medicine storage bottle 8. It can be understood that when the position of the medicine taking port on the medicine taking needle is relatively low, the bulging part of the sealing plug will wrap around the medicine taking port like a volcano, resulting in the blockage of the medicine taking passage by the bulging part of the sealing plug, affecting the extraction of the liquid medicine in the medicine storage bottle.

[0083] To avoid the above situation, as Figures 7 - 13 shown, a smooth convex structure 20 protruding outward in the radial direction of the needle rod 14 is provided on the outer periphery of the needle rod 14. The convex structure 20 is arranged close to the medicine taking port 16, and the outer surface of the convex structure 20 is configured as an arc surface. Preferably, the point on the convex structure 20 that is farthest from the outer periphery of the needle rod 14 (i.e., the most convex point) is higher than the vertex of the upward elastic deformation generated when the sealing plug 19 deforms. This solution can make the elastic sealing plug 19 tend to contract towards the part with a smaller cross-sectional area on the convex structure 20 when the medicine taking needle 10 punctures through the sealing plug 19 of the medicine storage bottle 8 by providing the convex structure 20 on the outside of the needle rod 14. Therefore, the sealing plug 19 will slide downward along the curve at the lower end of the convex structure 20, thereby changing the deformation of the sealing plug 19, reducing the amount of protrusion of the sealing plug 19 towards the inside of the medicine storage bottle 8, and further avoiding the blockage of the medicine taking port 16 and the medicine taking passage 15 by the sealing plug 19. The directional terms "up" and "down" mentioned here are only relative to the setting orientation of the medicine taking needle in the figure and are not restrictive. In addition, this solution can also achieve setting the medicine taking port 16 of the medicine taking passage 15 lower to achieve more sufficient medicine taking.

[0084] In a preferred embodiment, the convex structure 20 has a first projection on a vertical plane parallel to the axial direction of the needle rod 14, and the medicine taking port 16 has a second projection on the vertical plane. At least a part of the second projection is within the axial radiation range of the first projection. That is to say, in the axial direction of the needle rod 14, the axial extension of the medicine taking port 16 can be partially within the axial extension range of the convex structure 20, or the axial extension of the medicine taking port 16 can be entirely within the axial extension range of the convex structure 20. Further preferably, the entire second projection is within the axial radiation range of the first projection. That is to say, the axial extension of the medicine taking port 16 is entirely within the axial extension range of the convex structure 20, as Figures 7 - 13 shown.

[0085] The convex structure 20 can be continuously arranged around the circumferential direction of the needle rod 14 for one week, or the convex structure 20 can also be arranged at intervals around the circumferential direction of the needle rod 14. Those skilled in the art can set it according to actual needs. The convex structure 20 can be radially spaced apart from the outer periphery of the needle rod 14, or can be closely attached to the outer periphery of the needle rod 14. In the illustrated preferred embodiment, the convex structure 20 is generally configured in the shape of an arc-shaped handle, and the convex structure 20 is generally located radially outside the medicine-taking port 16. The two ends of the convex structure 20 are respectively attached to the needle rod 14 above and below the medicine-taking port 16, and the protruding part of the convex structure 20 is arranged at intervals from the outer periphery of the needle rod 14 to expose the medicine-taking port 16. It should be noted that the direction terms "upper" and "lower" mentioned here are both relative to the orientation of the medicine-taking needle 10 shown in the figure, and are not restrictive.

[0086] Continuing to refer to Figures 1 - 4 , the housing assembly 4 further includes a generally circular elastic gasket 11, and the elastic gasket 11 is disposed in the housing body 9 and fits to the joint end 13 of the housing body 9. The elastic gasket 11 is disposed closer to the injection head body 2 than the medicine-taking needle 10. As Figure 18 shown, a first through hole 21 communicating with the medicine-taking passage 15 and a second through hole 22 communicating with the air passage 18 are provided on the elastic gasket 11.

[0087] It can be understood that for a medicine storage bottle 8 with a fixed internal volume, such as a vial, when the liquid medicine is inhaled into the injection cavity 7, a negative pressure will be generated inside the medicine storage bottle 8. When the negative pressure acts on the elastic gasket 11, the elastic gasket 11 will deform, causing one end of it to tilt "upward", such as Figure 18 shown by the left end of the elastic gasket 11. Thus, the external air can be supplemented into the medicine storage bottle 8 through the gap between the housing body 9 and the elastic gasket 11, through the second through hole 22 and the air passage 18, so as to balance the internal and external pressures in the medicine storage cavity, facilitating the continuous suction of the liquid medicine from it smoothly.

[0088] As Figure 4 and Figure 18 shown, preferably, a circular first positioning port 23 is provided in the middle of the joint end 13, and a positioning flange 24 is provided on the elastic gasket 11. In the assembled state, a part of the positioning flange 24 extends into the first positioning port 23, and the first through hole 21 is opened on the positioning flange 24. This solution can, on the one hand, facilitate the assembly of the elastic gasket on the joint end 13, and on the other hand, prevent the position of the elastic gasket 11 from shifting.

[0089] As Figure 5As shown, preferably, a plurality of blocking ribs 25 are further provided on the inner side wall of the shell body 9, and the plurality of blocking ribs 25 are spaced apart in the circumferential direction of the shell body 9. When the medicine-taking needle 10 is placed inside the shell body 9, the plurality of blocking ribs 25 can abut against the base 17 of the medicine-taking needle 10 from the side facing the open end 12 of the medicine-taking needle 10 to limit the position of the medicine-taking needle 10.

[0090] During the assembly process of the housing assembly 4, the elastic gasket 11 and the medicine-taking needle 10 can be sequentially placed inside the shell body 9. When the elastic gasket 11 and the medicine-taking needle 10 are installed in place inside the shell body 9, the blocking ribs 25 on the shell body 9 will cooperate with the medicine-taking needle 10 to limit its position, thereby realizing the stable combination of the medicine-taking needle 10, the elastic gasket 11, and the shell body 9.

[0091] The process of installing the medicine storage bottle 8 can be as Figure 5 and Figure 6 shown. The medicine storage bottle 8 is pressed into the shell body 9 from the open end 12 of the shell body 9, so that the medicine-taking needle 10 pierces the sealing plug 19 of the medicine storage bottle 8, forming a communication between the injection cavity 7 and the inside of the medicine storage cavity.

[0092] In the present embodiment, the injection micropores 6 are provided at the first end of the injection head body 2, and the first end of the injection head body 2 is joined to the joining end 13 of the shell body 9. The injection micropores 6 communicate with the medicine-taking passage 15 via the first through hole 21 on the elastic gasket 11.

[0093] Referring to Figure 4 , a first snap portion 26 is provided on the outside of the joining end 13 of the shell body 9 (that is, on the side facing the injection micropores 6), and a circumferential snap flange 27 is provided at the first end of the injection head body 2. The snap flange 27 can be snapped onto the first snap portion 26, so that the shell body 9 and the injection head body 2 are joined. To further realize the stable joining of the shell body 9 and the injection head body 2, preferably, a plurality of first snap portions 26 are provided on the outside of the joining end 13 at evenly spaced intervals along its circumferential direction. Exemplarily, in the illustrated embodiment, four first snap portions 26 are provided on the outside of the joining end 13. It can be understood that those skilled in the art can also set other numbers of first snap portions 26 according to needs. In other embodiments not shown, the snap portion can also be provided on the injection head body, and the snap flange or the card slot can be provided on the shell body.

[0094] Operating handle

[0095] The operating handle 5 is connected to the piston assembly 3. The operating handle 5 can move relative to the injection head body 2 along the axial direction of the injection head body 2. During the movement of the operating handle 5, the piston assembly 3 can be synchronously driven to move within the injection cavity 7. In actual use, the user can pull the operating handle 5 backward to drive the piston assembly 3 combined therewith to aspirate the liquid medicine. If it is found that there are air bubbles in the liquid medicine aspirated into the injection cavity 7 during the aspiration of the liquid medicine, the operating handle 5 can be pushed forward to discharge the air bubbles. The process of aspirating the liquid medicine will be described in detail below.

[0096] The operating handle 5 is configured to be able to automatically stop moving when it moves to a predetermined position during the aspiration of the liquid medicine, that is, the operating handle 5 has a travel limit during the aspiration of the liquid medicine. By setting this travel limit, the aspiration of a fixed dose of the liquid medicine can be achieved, so that this solution can achieve the rapid and accurate aspiration of a fixed dose of the liquid medicine.

[0097] Preferably, the operating handle 5 is detachably connected to the injection head body 2. When it is desired to detach the operating handle 5 from the injection head body 2, the operating handle 5 can be rotated. When the operating handle 5 is rotated in place, it can be easily removed from the injection head body 2. The details will be described below.

[0098] As Figure 2 and Figures 14 - 17 shown, the operating handle 5 includes a housing portion 28 and an engaging portion 29 provided inside the housing portion 28. The housing portion 28 is generally configured as a cylinder, and the engaging portion 29 is also generally configured as a cylinder and is concentrically arranged with the housing portion 28. The housing portion 28 can be sleeved outside the injection head body 2. One end of the injection head body 2 has an open opening 30. When the housing portion 28 is sleeved outside the injection head body 2, the engaging portion 29 can extend into the injection head body 2 through the opening 30 and is detachably connected to the piston assembly 3.

[0099] Preferably, the engaging portion 29 is provided with a snap structure 31, and the piston assembly 3 includes a piston 32 and a base portion 33 tightly connected to the piston 32. The base portion 33 is provided with a slot structure 34 that cooperates with the snap structure 31.

[0100] In a preferred embodiment, as Figure 15 and Figure 22As shown, the joint 29 includes a support portion 35 and a plurality of axial extension rods 36 connected to the support portion 35 and extending from the support portion 35 in a direction toward the piston assembly 3. The support portion 35 is configured as a hollow cylinder, and the support portion 35 is connected to the middle of the end of the operating handle 5. The plurality of axial extension rods 36 are spaced apart from each other in the circumferential direction of the joint 29, and there is a gap between adjacent axial extension rods 36, and a snap structure 31 is provided at the end of each axial extension rod 36. In the illustrated embodiment, the joint 29 includes four axial extension rods 36 evenly spaced apart in the circumferential direction of the joint 29. It can be understood that those skilled in the art can set the number of axial extension rods according to actual needs.

[0101] like Figure 21 and Figure 22 As shown, the inner circumference of the opening portion 30 is provided with a plurality of protrusions 37 corresponding to the number of the plurality of axially extending rods 36, and the plurality of protrusions 37 are evenly spaced apart along the circumferential direction of the opening portion 30. Figure 21 When the operating handle 5 drives the piston 32 to move axially, the protrusion 37 can just abut against the radial outer side of the axial extension rod 36, preventing the buckle structure 31 at the end of the axial extension rod 36 from being separated from the slot structure 34 on the piston assembly 3, thereby ensuring that the operating handle 5 and the piston assembly 3 are reliably combined. When the operating handle 5 is to be removed from the injection head body 2, the operating handle 5 can be rotated (described in detail below), referring to Figure 22 When the operating handle 5 is rotated into position, the protrusion 37 may be staggered from the axial extension rod 36 in the circumferential direction, so that the protrusion 37 may no longer abut against the radial outer side of the axial extension rod 36, thereby facilitating the disassembly of the operating handle 5 and the piston assembly 3. In addition, this solution allows the piston assembly 3 to maintain its position when the operating handle 5 is removed, thereby avoiding changing the dose of the liquid medicine extracted into the injection chamber.

[0102] In another preferred embodiment, the position where the operating handle 5 engages with the piston assembly 3 has a deformation structure, and the deformation structure can make the operating handle 5 have a tendency to detach outward from the piston assembly 3 when the operating handle 5 engages with the piston assembly 3. In the assembled state of the injection assembly, the operating handle 5 engages with the piston assembly 3 and is pushed into the injection cavity 7. Due to the circumferential restriction of the injection cavity 7, the operating handle 5 and the piston assembly 3 can maintain a stable connection. When the restriction of the injection cavity 7 is cancelled, the deformation structure on the operating handle 5 can resume the outward deformation, so that the operating handle 5 can be easily detached from the connection with the piston assembly 3.

[0103] like Figure 16 and Figure 17As shown, the injection assembly 1 further includes a limiting structure configured to limit the rotation of the operating handle 5 relative to the injection head body 2 in a predetermined state. The predetermined state may be, for example, when the operating handle 5 drives the piston assembly 3 to move axially.

[0104] In a preferred embodiment, the injection head body 2 is provided with a first flange portion 39 extending along its circumferential direction near the opening 30, and a first groove 40 is provided on the first flange portion 39. A first protrusion 41 is provided on the inner surface of the housing portion 28. The first protrusion 41 can cooperate with the first groove 40, and the first protrusion 41 and the first groove 40 together form a set of limiting structures. Preferably, the first protrusion 41 has a predetermined length in the axial direction of the housing portion 28. The predetermined length of the first protrusion 41 is set such that the first protrusion 41 can always engage in the first groove 40 before the operating handle 5 moves to the above-mentioned predetermined position, and the first protrusion 41 can disengage from the first groove 40 when the operating handle 5 moves to the predetermined position, thereby avoiding interfering with the rotation of the operating handle 5 relative to the injection head body 2.

[0105] Further preferably, the injection assembly 1 includes two sets of limiting structures symmetrically arranged with respect to the central axis of the injection head body 2. That is to say, two first grooves 40 symmetrically arranged with respect to the central axis of the injection head body 2 are provided on the first flange portion 39, and two first protrusions 41 symmetrically arranged with respect to the central axis of the injection head body 2 are provided on the inner surface of the housing portion 28. It can be understood that in other embodiments not shown, the first groove 40 may also be provided on the housing portion 28, and the first protrusion 41 may be provided on the first flange portion 39.

[0106] Preferably, the injection assembly 1 further includes a stopping structure configured to limit the further axial movement of the operating handle 5 relative to the injection head body 2 when the operating handle 5 moves relative to the injection head body 2 to a predetermined position, thereby enabling the extraction of a fixed dose of liquid medicine.

[0107] Continue to refer to Figure 16 and Figure 17, in a preferred embodiment, a second protrusion 42 is further provided on the inner surface of the outer shell portion 28. The second protrusion 42 is provided at an end of the outer shell portion 28 close to the injection head body 2. The injection head body 2 further includes a second flange portion 43 extending along its circumferential direction. The second flange portion 43 is spaced apart from the first flange portion 39 in the axial direction of the injection head body 2, and the second flange portion 43 is provided above the first flange portion 39. A stop disc 44 extending a predetermined distance along its circumferential direction is provided on the second flange portion 43. The stop disc 44 is recessed in the axial direction of the second flange portion 43 along the direction towards the opening portion 30. The stop disc 44 is configured to be able to block the axial movement of the second protrusion 42. The second protrusion 42 and the stop disc 44 together constitute a set of stop structures.

[0108] Preferably, the injection assembly 1 includes two sets of stop structures arranged rotationally symmetrically with respect to the central axis of the injection head body 2. That is to say, two stop discs 44 arranged rotationally symmetrically with respect to the central axis of the injection head body 2 are provided on the second flange portion 39, and two second protrusions 42 arranged rotationally symmetrically with respect to the central axis of the injection head body 2 are provided on the inner surface of the outer shell portion 28.

[0109] As Figure 17 shown, a second groove 45 is further formed on the second flange portion 43. The second groove 45 communicates with the recessed portion of the stop disc 44. The position of the second groove 45 corresponds to the position of the first groove 40. That is to say, the position of the second groove 45 on the second flange portion 43 is substantially the same as the position of the first groove 40 on the first flange portion 39. The second groove 45 can also cooperate with the first protrusion 41. That is to say, the first protrusion 41 can be engaged with both the first groove 40 and the second groove 45 at the same time. Preferably, the second protrusion 42 can also cooperate with both the first groove 40 and the second groove 45.

[0110] In a preferred embodiment, the second protrusion 42 is spaced apart from the first protrusion 41 both in the axial direction and the circumferential direction of the outer shell portion 28. Further preferably, the shortest axial distance between the first protrusion 41 and the second protrusion 42 is substantially equal to the distance between the top surface of the stop disc 44 and the bottom surface of the first flange portion 39, and the circumferential length between the first protrusion 41 and the second protrusion 42 close to the first protrusion 41 is substantially equal to the circumferential length of the stop disc 44.

[0111] The drug suction process of the injection assembly is described in detail below.

[0112] When it is desired to extract the liquid medicine, the user can pull the operating handle 5 away from the medicine storage bottle 8, and the operating handle 5 drives the piston assembly 3 to move synchronously. When performing the extraction operation, the first protrusion 41 on the operating handle 5 interacts with the first groove 40 on the injection head body 2 to prevent an unexpected relative rotation between the operating handle 5 and the injection head body 2. When the operating handle 5 axially moves to a predetermined position, the second protrusion 42 on the operating handle 5 is blocked by the stop disk 44 on the injection head body 2, preventing the operating handle 5 from further axially moving. The distance that the operating handle 5 is pulled before the second protrusion 42 contacts the stop disk 44 determines the dosage of the medicine taken. When the second protrusion 42 on the operating handle 5 is blocked by the stop disk 44 on the injection head body 2, the first protrusion 41 also just disengages from the first groove 40, so that the rotational movement of the operating handle 5 is no longer restricted.

[0113] As Figure 19 and Figure 20 shown, when it is desired to remove the operating handle 5 from the injection head body 2, the operating handle 5 can be rotated first. Since the second protrusion 42 abuts against the recessed stop disk 44 at this time and one end is blocked by the stop disk 44, the second protrusion 42 can only rotate in the direction towards the second groove 45. When rotated until the second protrusion 42 aligns with the second groove 45, the operating handle 5 can be separated from the piston assembly 3 first, and then the operating handle 5 is pulled downward. At the same time, the second protrusion 42 can slide down along the second groove 45 and the first groove 40, so that the operating handle 5 can smoothly disengage from the injection head body 2.

[0114] The injection assembly 1 according to the present embodiment can be used in cooperation with the pushing device 46 to perform an injection operation. The injection assembly 1 and the pushing device 46 together constitute an injection system 47 according to a preferred embodiment of the present invention. In a preferred embodiment, as Figure 23 shown, the pushing device 46 includes a housing 48, a push rod 49 disposed inside the housing, and a locking mechanism 50. The push rod 49 can be pushed to move relative to the housing 48. At least a part of the injection head body 2 can be engaged in the housing 48, and the push rod 49 can contact or engage with the piston assembly 3 to push the piston assembly 3 in the direction towards the injection micropore 6 when performing an injection operation.

[0115] The housing has an open end 51, and the locking mechanism 50 is disposed at the open end 51. The locking mechanism 50 can move between a locked position and an unlocked position. Among them, as Figure 24 and Figure 25 shown, when the locking mechanism 50 is in the locked position, the locking mechanism 50 forms a first passage path in the open end 51, and the cross-sectional area of the first passage path is small, which is convenient for limiting the injection head body 2. As Figure 23As shown, when the locking mechanism 50 is in the unlocked position, the locking mechanism 50 forms a second passage path in the open end 51. The cross-sectional area of the second passage path is relatively large, enabling the injection head body 2 to pass through smoothly. Preferably, the cross-sectional area of the first passage path is smaller than that of the second passage path.

[0116] In one embodiment, the locking mechanism 50 can be configured as a snap structure arranged along the circumferential direction of the pushing device 46. This snap structure can move radially inward to the locked position or radially outward to the unlocked position. The locking mechanism 50 can be in the unlocked position before the injection head body 2 is engaged with the housing 48. After the injection head body 2 is properly installed in the pushing device 46, the locking mechanism 50 can move radially inward to snap to the locked position of the injection head body 2. It can be understood that in other embodiments not shown, the locking mechanism can also be set to other structures. For example, the locking mechanism can include a plurality of rotating blocks arranged in the open end. The rotating blocks can rotate in the open end to respectively form passage paths with different cross-sectional areas.

[0117] As Figure 24 shown, after the injection head body 2 is installed on the pushing device 46, the locking mechanism 50 can be operated to lock the injection head body 2 to restrict the axial movement of the injection head body 2. At the same time, the housing assembly 4 can be removed from the injection head body 2 to expose the injection micropores 6. When an injection operation is intended, the push rod 49 of the pushing device 46 can be operated to push the piston assembly 3 so that the liquid medicine is ejected from the injection micropores 6 for injection, as Figure 25 shown.

[0118] Embodiment 2

[0119] The following refers to Figures 26 - 33 for a detailed description of the injection assembly 101 according to the second preferred embodiment of the present invention.

[0120] In this embodiment, as Figures 26 - 29 shown, the injection head body 102 has a first end 180 and a second end 181 opposite to the first end. The injection micropores 106 are provided at the first end 180, and the second end 181 of the injection head body 102 is engaged with the engagement end 113 of the housing body 109. That is to say, the injection micropores 106 are provided at one end of the injection head body 102 far from the housing assembly 104.

[0121] As Figure 29 and Figure 30As shown, in this embodiment, the piston assembly 103 includes a piston 132 and a piston rod 160. One end of the piston rod 160 is engaged with the piston 132. One end of the piston 132 is configured to be conical, and the injection cavity has a shape matching that of the conical piston. The conical tip can be inserted into the injection micropore 106. A first passage 161 is provided in the piston 132. In the illustrated preferred embodiment, the first passage 161 is arranged at an angle with respect to the central axis of the injection cavity. It can be understood that in other embodiments not shown, the first passage 161 can also be arranged parallel to the central axis of the injection cavity. A second passage 162 is provided in the piston push rod 132. Preferably, the second passage 162 extends along the direction of the central axis of the injection cavity. Preferably, the first passage 161 and the second passage 162 are spaced apart in the radial direction of the injection cavity. The first passage 161 can communicate with the second passage 162, and the second passage 162 communicates with the medicine taking passage 115 via a first through hole 121 in the elastic gasket 111.

[0122] The process of installing the medicine storage bottle 8 is similar to the process described in the first embodiment. As Figure 29 and Figure 30 shown, the medicine storage bottle 8 can be pressed into the housing body 109 from the open end 112 of the housing body 109, and the medicine taking needle 110 pierces the sealing plug 19 of the medicine storage bottle 8 to form a communication between the injection cavity 107 and the inside of the medicine storage cavity.

[0123] Referring to Figures 27 - 29 , the piston assembly 103 further includes a piston cap 163. The piston cap 163 is connected to the end of the piston rod 160 opposite to the piston 132. Preferably, the piston cap 163 and the piston rod 160 are an integral unit formed as one piece. The piston cap 163 is connected to the engaging end 113 of the housing body 109 and substantially closes the engaging end 113 of the housing body 109.

[0124] In a preferred embodiment, a circular second positioning port 164 is provided at a substantially middle position of the piston cap 163. The second positioning port 164 communicates with the second passage 162 in the piston rod 160. A positioning flange 124 is provided on the elastic gasket 111. As Figure 30 shown, in the assembled state, a part of the positioning flange 124 extends into the second positioning port 164, and the first through hole 121 is opened on the positioning flange 124. This solution can, on the one hand, facilitate the assembly of the elastic gasket on the piston cap, and on the other hand, prevent the position of the elastic gasket 111 from shifting. As Figure 32 shown, an air inlet 182 is also provided on the piston cap 163. The air inlet 182 can communicate with a second through hole 122 on the elastic gasket 111. The air inlet 182 can facilitate the entry of air into the medicine storage cavity during the process of extracting the liquid medicine.

[0125] Continuing to refer to Figure 28, engaging structures that cooperate with each other are respectively provided on the piston cap 163 and the housing main body 109. In a preferred embodiment, a plurality of engaging openings 165 are provided near the outer periphery of the piston cap 163, and a plurality of engaging latches 166 extending toward the piston cap 163 are provided on the peripheral edge of the housing main body 109. The plurality of engaging latches 166 respectively cooperate with the plurality of engaging openings 165 to achieve the connection between the housing main body 109 and the piston cap 163. The engaging openings 165 and the engaging latches 166 together constitute the engaging structure. Exemplarily, in the illustrated embodiment, the number of the engaging openings 165 and the engaging latches 166 is four respectively. It can be understood that in other embodiments not shown, those skilled in the art can set other numbers of engaging openings 165 and engaging latches 166 according to actual needs, or the engaging openings can be provided on the housing main body and the engaging latches can be provided on the piston cap, or the engaging structure can be set in other forms.

[0126] During the assembly process of the housing assembly 104, the elastic gasket 111 and the medicine-taking needle 110 can be sequentially placed on the piston cap 163, and then the housing main body 109 and the piston cap 163 are locked to each other by using the engaging structure on the housing main body 109 and the piston cap 163, so as to fix the elastic gasket 111 and the medicine-taking needle 110.

[0127] As Figures 26 - 30 shown, in the present embodiment, the injection assembly 101 further includes an end cap 167, and the end cap 167 can be sleeved on the injection head main body 102 from the first end 180 (that is, the end where the injection micropore 106 is provided) of the injection head main body 102. An elastic seal 168 is provided in the end cap 167, and the elastic seal 168 is hermetically arranged around the injection micropore 106 at the first end 180 of the injection head main body 102. The elastic seal 168 can seal the injection micropore 106 when extracting the liquid medicine, so as to form a vacuum inside the injection cavity 107 and ensure the smooth realization of the medicine-taking function.

[0128] Preferably, the elastic seal 168 has an initial state and a deformed state. As Figure 29 shown, in the initial state, the elastic seal 168 is partially spaced apart from the first end 180 of the injection head main body 102, and a sealing space is formed between the elastic seal 168 and the first end 180 of the injection head main body 102. In the deformed state, the elastic seal 168 is squeezed in the direction toward the injection micropore 106, so as to discharge the air in the sealing space and form a negative pressure in the sealing space.

[0129] As Figure 29 and Figure 30As shown, in a preferred embodiment, the elastic seal 168 includes a joint portion 169 and a sealing portion 170. The joint portion 169 and the sealing portion 170 are preferably integrally formed. A through hole 171 is provided at the end of the end cap 167, and the joint portion 169 extends through the through hole 171 and engages in the through hole 171. The sealing portion 170 is preferably configured as a bowl-shaped suction cup structure. In the initial state of the elastic seal 168, the periphery of the sealing portion 170 abuts against the first end 180 of the injection head body 102.

[0130] When the piston assembly 103 inside the injection head body 102 starts to move in a direction away from the injection micropore, due to the sealing property and the resilience of the elastic seal 168, the gas inside the piston assembly 103 and the medicine-taking needle 110 will be first led out to the sealing space formed between the elastic seal 168 and the first end 180 of the injection head body 102. Preferably, the structure and the compressible stroke of the elastic seal 168 can be set as needed, so that a desired and controllable amount of air can be led out, achieving the effect of avoiding the generation of bubbles inside the injection cavity without wasting too much liquid medicine. Preferably, the elastic seal 168 can be made of a flexible material such as rubber.

[0131] Preferably, as Figure 29 shown, in the initial state of the elastic seal 168, there is a certain gap in the axial direction between the end of the end cap 167 close to the second end 181 of the injection head body 102 and the injection head body 102, and the axial distance d of the gap is approximately equal to the axial deformation amount of the elastic seal 168.

[0132] As Figure 31 shown, a plurality of second snap portions 172 are provided in the end cap 167 close to the elastic seal 168, and a snap flange 127 is provided at the first end of the injection head body 102. The snap flange 127 is configured to be snap-connected to the second snap portions 172, so as to realize a firm connection between the end cap 167 and the injection head body 102.

[0133] Return to reference Figure 27 and Figure 28 , preferably, a plurality of guiding ribs 173 extending in the axial direction are provided on the inner side wall of the end cap 167. The plurality of guiding ribs 173 are evenly spaced in the circumferential direction of the end cap 167. The injection head body 102 is accommodated in the area surrounded by the plurality of guiding ribs 173. This solution can prevent the position of the injection head body 102 from shifting and can keep the injection head body 102 in an appropriate position all the time. In the illustrated embodiment, four guiding ribs 173 extending in the axial direction are provided on the inner side wall of the end cap 167. It can be understood that in other embodiments not shown, other numbers of guiding ribs 173 can be provided on the inner side wall of the end cap 167.

[0134] As Figures 27 - 30 shown, the end cap 167 is generally configured as a cylinder and includes a first cap portion 174 and a second cap portion 175 connected to the first cap portion 174. The cross-sectional diameter of the first cap portion 174 is greater than that of the second cap portion 175. The guiding rib 173 is provided on the first cap portion 174, and the second latching portion 172 and the elastic seal 168 are provided on the second cap portion 175.

[0135] The drug suction process of the injection assembly will be described in detail below.

[0136] As Figure 29 and Figure 30 shown, when installing the medicine storage bottle 8, in order to complete the puncturing action of the sealing plug 19 of the medicine storage bottle 8, the operator needs to hold the end cap 167 and press it in the direction of the medicine storage bottle 8 so that it abuts against the injection head main body 102. At this time, the moving distance of the end cap 167 is the axial distance d of the above-mentioned gap. During the pressing process, the elastic seal 168 inside the end cap 167 will be squeezed and deformed (as Figure 30 shown), thereby discharging the original enclosed gas inside the sealed space. At this time, since the end of the piston 132 seals the injection micropore 106, the gas in the sealed space can only be discharged to the outside from the gap between the elastic seal 168 and the injection head main body 102. After the gas in the sealed space is discharged, a certain negative pressure is formed between the elastic seal 168 and the first end 180 of the injection head main body 102.

[0137] As Figure 31 shown, at the moment when the extraction action of the piston assembly 103 starts, the piston assembly 103 generates a small displacement in the direction away from the injection cavity 107, and the end of the piston 132 leaves the injection micropore 106, releasing the seal of the injection micropore 106. The negative pressure formed between the elastic seal 168 and the first end 180 of the injection head main body 102 will actively suck the air in the liquid medicine passage inside the piston assembly 103 and direct it to the enclosed space formed between the elastic seal 168 and the first end 180 of the injection head main body 102. The guiding path of the air is as shown by the arrow in Figure 31 . Through this design, the gas in the liquid medicine passage inside the piston assembly 103 can be reduced or eliminated, avoiding the generation of bubbles when the liquid medicine is inhaled into the injection cavity 107.

[0138] As Figure 32As shown, during the process of extracting the liquid medicine, the piston assembly 103 continues to move in a direction away from the injection micropore 106. Since the injection micropore 106 is sealed by the elastic seal 168, a negative pressure will be generated in the space formed between the injection chamber 107 and the piston 132. The negative pressure will cause the piston 132 to displace or deform in a direction away from the piston rod 160, thereby connecting the first passage and the second passage, and further forming a liquid medicine passage from the medicine storage bottle 8 to the injection chamber 107, as Figure 32 shown by the arrow on the right. In addition, as described in the first embodiment, due to the pressure difference between the inside and outside of the medicine storage chamber, the elastic gasket 111 will deform, allowing the outside air to be replenished into the inside of the medicine storage chamber, as Figure 32 shown by the arrow on the left. This solution helps with the extraction of the liquid medicine.

[0139] As Figure 33 shown, the piston assembly 103 runs to a predetermined position and the extraction of the liquid medicine is completed. The piston 132 resumes its original shape, so the first passage and the second passage are no longer connected, and the liquid medicine passage from the medicine storage chamber to the injection chamber 107 is blocked. Also, as the pressure difference between the inside and outside of the medicine storage chamber decreases, the deformation of the elastic gasket 111 is restored, and the outside air is no longer replenished into the inside of the medicine storage chamber.

[0140] As Figure 34 and Figure 35 shown, during the injection operation, the injection assembly 101 with the end cap 167 removed can be installed on a pushing device (the pushing device is omitted in the figure for simplicity). The piston assembly 103 is driven by the pushing device to move in the direction of the injection micropore 106, so that the piston 132 can push the liquid medicine inside the injection chamber 107 to spray out from the injection micropore 106 at the end of the injection chamber 107. Due to the extrusion of the liquid medicine inside the injection chamber 107, the piston 132 will be closely attached to the end of the piston rod 160, reliably sealing the second passage 162 in the piston rod 160 to prevent the liquid medicine from flowing back into the medicine storage chamber.

[0141] The mating features such as protrusions, grooves, flanges, and buckles in each mating structure group provided in this embodiment can be structures that extend circumferentially and are intermittently arranged, or structures that are continuously arranged circumferentially. The injection assembly can make corresponding structural adjustments.

[0142] In addition, although the embodiments of the present invention take a needleless syringe as an example, the structure of the present invention can also be applied to a needle syringe.

[0143] 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 modifications 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 cover all alternatives, modifications, and variations of the present invention described herein, as well as other embodiments falling within the spirit and scope of the present invention described above.

Claims

1. An injection assembly, characterized in that, the injection assembly comprises: an injection head body, an injection cavity is provided in the injection head body, and injection micropores are provided on the injection head body; a piston assembly, the piston assembly is movably arranged in the injection cavity; and an operating handle, the operating handle is connected to the piston assembly, the operating handle is configured to be able to move away from the injection micropores along the axial direction of the injection head body relative to the injection head body, and be able to automatically stop moving when moving to a predetermined position, wherein, the operating handle includes a housing portion, the housing portion is sleeved outside the injection head body, the injection head body is provided with a first flange portion, a first protrusion is provided on the housing portion, and a first groove cooperating with the first protrusion is provided on the first flange portion, wherein, the first protrusion is provided on the inner surface of the housing portion and has a predetermined length in the axial direction of the housing portion, the predetermined length of the first protrusion is set such that the first protrusion can remain engaged in the first groove before the operating handle moves to the predetermined position, and the first protrusion disengages from the first groove when the operating handle moves to the predetermined position.

2. The injection assembly according to claim 1, characterized in that, the operating handle is detachably connected to the piston assembly.

3. The injection assembly according to claim 1, characterized in that, the operating handle is detachably connected to the injection head body.

4. The injection assembly according to claim 3, characterized in that, the operating handle further includes an engaging portion provided inside the housing portion, the housing portion is configured as a cylinder, the engaging portion is also configured as a cylinder and is concentrically arranged with the housing portion, the injection head body has an opening portion, the engaging portion extends into the injection head body through the opening portion and is detachably connected to the piston assembly.

5. The injection assembly according to claim 4, characterized in that, the engaging portion is provided with a snap structure, the piston assembly includes a piston and a base connected to the piston, and a slot structure cooperating with the snap structure is provided on the base.

6. The injection assembly according to claim 5, characterized in that, the engaging portion includes a support portion and a plurality of axially extending rods connected to the support portion and extending from the support portion along the direction towards the piston assembly, the support portion is configured as a hollow cylinder, the support portion is connected to the end of the operating handle, the plurality of axially extending rods are spaced apart from each other in the circumferential direction of the engaging portion and there is a gap between adjacent axially extending rods, and each axially extending rod includes the snap structure.

7. The injection assembly according to claim 6, characterized in that, a plurality of protrusions corresponding to the number and position of the plurality of axially extending rods are provided on the inner circumference of the opening portion, and the protrusions are configured to be able to abut against the axially extending rods on the radial outside of the axially extending rods when the operating handle drives the piston to move axially.

8. The injection assembly according to claim 4, characterized in that, The injection assembly further includes a limiting structure configured to limit the rotation of the operating handle relative to the injection head body in a predetermined state, and the first protrusion and the first groove together constitute a set of the limiting structures.

9. The injection assembly according to claim 8, wherein, the injection assembly includes two sets of the limiting structures symmetrically arranged with respect to the central axis of the injection head body.

10. The injection assembly according to claim 8, wherein, the injection assembly further includes a stopping structure configured to limit further axial movement of the operating handle relative to the injection head body when the operating handle moves relative to the injection head body to the predetermined position.

11. The injection assembly according to claim 10, wherein, a second protrusion is further provided on the outer shell portion, and the injection head body further includes a second flange portion. The second flange portion is spaced apart from the first flange portion in the axial direction of the injection head body. A stop disk extending a predetermined distance along its circumferential direction is provided on the second flange portion. The stop disk is recessed in the axial direction of the second flange portion along the direction towards the opening portion. The stop disk is configured to block the axial movement of the second protrusion, and the second protrusion and the stop disk together constitute a set of the stopping structures.

12. The injection assembly according to claim 11, wherein, the injection assembly includes two sets of the stopping structures symmetrically arranged with respect to the central axis of the injection head body in a rotationally symmetric manner.

13. The injection assembly according to claim 11, wherein, a second groove is further provided on the second flange portion. The second groove communicates with the recessed portion of the stop disk. The position of the second groove corresponds to the position of the first groove. The second groove is configured to cooperate with the first protrusion.

14. The injection assembly according to claim 13, wherein, the second protrusion is configured to cooperate with the first groove and the second groove.

15. The injection assembly according to claim 11, wherein, the second protrusion is spaced apart from the first protrusion both in the axial direction and the circumferential direction of the outer shell portion.

16. The injection assembly according to claim 15, wherein, the shortest axial distance between the first protrusion and the second protrusion is substantially equal to the distance between the top surface of the stop disk and the bottom surface of the first flange portion, and / or the circumferential length between the first protrusion and the second protrusion is substantially equal to the circumferential length of the stop disk.

17. The injection assembly according to any one of claims 1-16, wherein, it further includes a housing assembly, and the housing assembly includes: a housing main body having an open end and a joining end opposite to the open end. The open end is capable of allowing a medicine storage bottle to enter the housing main body, and the joining end is joined to the injection head body; The medicine-taking needle is disposed inside the housing main body, and a medicine-taking passage that can communicate with the outside and the injection chamber is provided in the medicine-taking needle.

18. The injection assembly according to claim 17, wherein, the housing assembly further includes an elastic gasket, the elastic gasket is disposed in the housing main body, the elastic gasket is disposed closer to the injection head main body than the medicine-taking needle, and a first through hole communicating with the medicine-taking passage is provided on the elastic gasket.

19. The injection assembly according to claim 18, wherein, an air passage is further provided in the medicine-taking needle, and the air passage and the medicine-taking passage are independently provided.

20. The injection assembly according to claim 19, wherein, a second through hole communicating with the air passage is provided on the elastic gasket.

21. The injection assembly according to claim 17, wherein, a plurality of blocking ribs are provided on the inner side wall of the housing main body, the plurality of blocking ribs are spaced apart in the circumferential direction of the housing main body, and the plurality of blocking ribs are configured to be able to abut against the medicine-taking needle from the side of the medicine-taking needle facing the open end when the medicine-taking needle is placed inside the housing main body.

22. The injection assembly according to claim 18, wherein, the injection micropores are provided at the first end of the injection head main body, the first end is joined to the joining end of the housing main body, and the injection micropores communicate with the medicine-taking passage through the first through hole.

23. The injection assembly according to claim 22, wherein, a first snap portion is provided on the side of the joining end facing the injection micropores, a circumferential snap flange is provided at the first end, and the snap flange is configured to be able to snap to the first snap portion.

24. The injection assembly according to claim 18, wherein, a first positioning port is provided on the joining end, a positioning flange is provided on the elastic gasket, a part of the positioning flange extends into the first positioning port, and the first through hole is opened on the positioning flange.

25. An injection system, wherein, comprises: the injection assembly according to any one of claims 1-24, an injection micropore is provided at one end of the injection head main body; and a pushing device, the pushing device includes a housing and a push rod disposed inside the housing, the push rod is movably disposed in the housing, at least a part of the injection head main body can be joined in the housing, and the push rod is configured to be able to contact the piston assembly to push the piston assembly in the direction towards the injection micropore.

26. The injection system according to claim 25, wherein, the push rod is configured to be able to engage with the piston assembly to push the piston assembly in the direction towards the injection micropore.

27. The injection system according to claim 25, wherein, the pushing device further includes a locking mechanism, the housing has an open end, the locking mechanism is disposed at the open end, and the locking mechanism is movable between a locked position and an unlocked position. Wherein when the locking mechanism is in the locked position, the locking mechanism forms a first passage path in the open end, and when the locking mechanism is in the unlocked position, the locking mechanism forms a second passage path in the open end through which the injection head body can pass, and the cross-sectional area of the first passage path is smaller than the cross-sectional area of the second passage path.

Images