Injection assembly and injection system comprising the same

Abstract

The present invention provides an injection assembly and an injection system including the injection assembly. The injection assembly includes an injection head body, a piston assembly and a shell assembly. An injection cavity is provided in the injection head body, and an injection micropore is provided at the end of the injection head body. The piston assembly is configured to be movable in the injection cavity. The shell assembly includes a shell body and a medicine extraction needle, the shell body having an open end and a coupling end opposite to the open end, the open end being capable of allowing a medicine storage bottle to enter the shell body, and the coupling end being coupled with the injection head body. The medicine extraction needle is provided inside the shell body, and a medicine extraction passage that can communicate with the outside and the injection cavity is provided in the medicine extraction needle. By providing a shell body and providing a medicine extraction needle in the shell body, this solution can facilitate placing the medicine storage bottle in the shell body for extracting medicine, avoiding the user holding the bottle in hand, and saving manpower.

Description

Technical Field

[0001] The present invention relates to the field of medical devices. More specifically, the present invention relates to an injection assembly capable of sucking and injecting a liquid medicine and an injection system comprising the injection assembly. More particularly, the present invention relates to a needle-free injection assembly and an injection system comprising the needle-free injection assembly. Background Art

[0002] With existing syringes, when users are taking medicine, they sometimes put the medicine bottle on the table to absorb the liquid medicine. Understandably, if the medicine bottle is not stabilized at this time, it is easy to cause the medicine bottle to fall over and the liquid medicine to spill during the absorption process. Or users sometimes hold the medicine bottle in their hands to absorb the liquid medicine, but this method often requires the user to free one hand to fix the medicine bottle, while at the same time the user's other hand needs to operate the syringe (for example, pull the piston) to extract the liquid medicine. It can be seen that this operation method brings inconvenience to the user.

[0003] Therefore, it is necessary 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] According to a first aspect of the present invention, there is provided an injection assembly, the injection assembly comprising:

[0005] An injection head body, wherein an injection cavity is disposed in the injection head body, and an injection microhole is disposed at the end of the injection head body;

[0006] a piston assembly configured to be movable within the injection chamber; and

[0007] A housing assembly, the housing assembly comprising:

[0008] A shell body, the shell body having an open end and a coupling end opposite to the open end, the open end being capable of allowing a medicine storage bottle to enter the shell body, and the coupling end being coupled to the injection head body;

[0009] A medicine taking needle is arranged inside the shell body, and a medicine taking passage is arranged in the medicine taking needle so as to communicate with the outside and the injection cavity.

[0010] Preferably, the shell assembly further comprises an elastic gasket, which is arranged in the shell body, the elastic gasket is arranged closer to the injection head body than the medicine extraction needle, and the elastic gasket is provided with a first through hole connected to the medicine extraction passage.

[0011] Preferably, the medicine taking needle is further provided with an air passage, and the air passage and the medicine taking passage are provided independently of each other.

[0012] Preferably, the length of the air passage is greater than the length of the medicine taking passage.

[0013] Preferably, the elastic gasket is provided with a second through hole communicating with the air passage.

[0014] Preferably, at least one blocking rib is provided on the inner side wall of the shell body, and the at least one blocking rib is configured to abut against the medicine removal needle from a side of the medicine removal needle facing the open end when the medicine removal needle is placed inside the shell body.

[0015] Preferably, a plurality of barrier ribs are disposed on the inner side wall of the shell body, and the plurality of barrier ribs are evenly spaced apart in a circumferential direction of the shell body.

[0016] Preferably, the injection micropore is arranged at the first end of the injection head body, the first end is joined to the joining end of the shell body, and the injection micropore is connected to the drug extraction passage via the first through hole.

[0017] Preferably, a first buckle portion is provided on a side of the joint end facing the injection micropore, and a circle of buckle flange is provided on the first end, and the buckle flange is configured to be able to be buckled to the first buckle portion.

[0018] Preferably, a first positioning opening is provided on the joint end, a positioning flange is provided on the elastic gasket, a part of the positioning flange extends into the first positioning opening, and the first through hole is opened on the positioning flange.

[0019] Preferably, the injection assembly further comprises an operating handle, the operating handle being connected to the piston assembly, and the operating handle being configured to be operable to drive the piston assembly to move within the injection chamber.

[0020] Preferably, the operating handle is configured to be movable relative to the injection head body, and to stop moving when it moves to a predetermined position.

[0021] Preferably, the operating handle is detachably connected to the injection head body.

[0022] Preferably, the operating handle includes an outer shell portion and a coupling portion arranged inside the outer shell portion, the outer shell portion is constructed into a cylindrical shape, the coupling portion is also constructed into a cylindrical shape and is arranged concentrically with the outer shell portion, the outer shell portion is sleeved on the outside of the injection head body, the injection head body has an opening portion, the coupling portion extends into the interior of the injection head body through the opening portion, and is detachably connected to the piston assembly.

[0023] Preferably, the engaging portion is provided with a snap-fit ​​structure, the piston assembly comprises a piston and a base connected to the piston, and the base is provided with a slot structure cooperating with the snap-fit ​​structure.

[0024] Preferably, the joint portion includes a supporting portion and a plurality of axially extending rods connected to the supporting portion and extending from the supporting portion in a direction toward the piston assembly, the supporting portion being constructed as a hollow cylinder, the plurality of axially extending rods being spaced apart from each other in a circumferential direction of the joint portion, and each axially extending rod including the snap-fit ​​structure.

[0025] Preferably, the inner periphery of the opening portion is provided with a plurality of protrusions corresponding to the number and positions of the plurality of axially extending rods, and the protrusions are constructed 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.

[0026] Preferably, the injection assembly further comprises a limiting structure, and the limiting structure is configured to limit the rotation of the operating handle relative to the injection head body under a predetermined state.

[0027] Preferably, the injection head body is provided with a first flange portion near the opening portion, the first flange portion and one of the shell portions are provided with a first protrusion, and the other of the first flange portion and the shell portion is provided with a first groove matching the first protrusion, and the first protrusion and the first groove together constitute a set of the limiting structures.

[0028] Preferably, the injection assembly comprises two groups of the limiting structures which are symmetrically arranged relative to the central axis of the injection head body.

[0029] Preferably, the first groove is arranged on the first flange portion, the first protrusion is arranged on the inner surface of the shell portion and has a predetermined length in the axial direction of the shell portion, and the predetermined length of the first protrusion is set so 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.

[0030] Preferably, the injection assembly further comprises a stop structure, which is configured to limit further axial movement of the operating handle relative to the injection head body when the operating handle moves to the predetermined position relative to the injection head body.

[0031] Preferably, a second protrusion is also provided on the outer shell portion, and the injection head body also 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, and a stop plate is provided on the second flange portion, extending a predetermined distance along its circumferential direction, and the stop plate is recessed in the axial direction of the second flange portion along the direction toward the opening portion, and the stop plate is constructed to be able to block the axial movement of the second protrusion, and the second protrusion and the stop plate together constitute a group of the stopping structure.

[0032] Preferably, the injection assembly comprises two sets of the stop structures which are rotationally symmetrically arranged relative to the central axis of the injection head body.

[0033] Preferably, the second flange portion is further provided with a second groove, the second groove is communicated with the recess of the stop plate, the position of the second groove corresponds to the position of the first groove, and the second groove is configured to be able to cooperate with the first protrusion.

[0034] Preferably, the second protrusion is configured to be capable of cooperating with the first groove and the second groove.

[0035] Preferably, the second protrusion is spaced apart from the first protrusion both in the axial direction and in the circumferential direction of the housing portion.

[0036] 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 plate 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 plate.

[0037] Preferably, the injection head body has a first end and a second end opposite to the first end, the injection microhole is arranged at the first end, and the second end is closer to the joint end of the shell body than the first end.

[0038] Preferably, the piston assembly includes a piston and a piston rod, one end of the piston rod is engaged with the piston, a first passage is provided in the piston, a second passage that can be connected to the first passage is provided in the piston rod, and the second passage is connected to the medicine extraction passage via the first through hole.

[0039] Preferably, the piston assembly further comprises a piston cap connected to an end of the piston rod opposite to the piston, the piston cap being connected to the engaging end of the housing body.

[0040] Preferably, a second positioning opening is provided on the piston cap, a positioning flange is provided on the elastic gasket, a portion of the positioning flange extends into the second positioning opening, and the first through hole is opened on the positioning flange.

[0041] Preferably, the piston cap and the piston rod are an integral piece.

[0042] Preferably, the piston cap and the shell body are respectively provided with mutually matching clamping structures.

[0043] Preferably, the piston cap is provided with a plurality of snap-fit ​​openings near the outer circumference, and the shell body is provided with a plurality of snap-fit ​​buckles cooperating with the plurality of snap-fit ​​openings, and the snap-fit ​​openings and the snap-fit ​​buckles together constitute the snap-fit ​​structure.

[0044] Preferably, the injection assembly further comprises:

[0045] An end cap, wherein the end cap is sleeved on the injection head body from the first end, wherein an elastic seal is arranged in the end cap, and wherein the elastic seal is sealed around the injection micropore and arranged at the first end of the injection head body, wherein the elastic seal has an initial state and a deformed state, wherein in the initial state, the elastic seal is partially spaced apart from the first end of the injection head body, and a sealed space is formed between the elastic seal and the first end of the injection head body, and in the deformed state, the elastic seal is constructed to be able to be squeezed in a direction toward the injection micropore to form a negative pressure in the sealed space.

[0046] Preferably, the elastic seal comprises a sealing portion, the sealing portion is constructed as a bowl-shaped suction cup structure, and in the initial state of the elastic seal, the peripheral edge of the sealing portion abuts against the first end of the injection head body.

[0047] Preferably, a through hole is provided at the end of the end cap, and the elastic sealing member further comprises a joint portion, the joint portion is connected to the sealing portion, and the joint portion is engaged in the through hole.

[0048] Preferably, in the initial state of the elastic seal, there is a gap in the axial direction between the end of the end cap close to the second end of the injection head body and the injection head body, and the axial distance of the gap is roughly equal to the axial deformation of the elastic seal.

[0049] Preferably, a second snap-fitting portion is provided in the end cap near the elastic sealing member, and a circle of snap-fitting flange is provided at the first end of the injection head body, and the snap-fitting flange is constructed to be snap-fitted to the second snap-fitting portion.

[0050] Preferably, the inner side wall of the end cap is provided with a plurality of guide ribs extending along the axial direction thereof.

[0051] Preferably, the end cap includes a first cap portion and a second cap portion connected to the first cap portion, the cross-sectional diameter of the first cap portion is larger than the cross-sectional diameter of the second cap portion, the guide rib is arranged on the first cap portion, and the second snap-on portion and the elastic seal are arranged on the second cap portion.

[0052] According to a second aspect of the present invention, there is also provided an injection system, comprising:

[0053] An injection assembly as described above; and

[0054] A pushing device, comprising a shell and a push rod arranged inside the shell, the push rod is movably arranged in the shell, at least a portion of the injection head body can be engaged in the shell, and the push rod is constructed to be able to contact or engage with the piston assembly to push the piston assembly in a direction toward the injection micropore.

[0055] Preferably, the pushing device further comprises a locking mechanism, the housing has an open end, the locking mechanism is arranged at the open end, and the locking mechanism is movable between a locking position and an unlocking position.

[0056] When the locking mechanism is in the locking position, the locking mechanism forms a first passing path in the open end, and when the locking mechanism is in the unlocking position, the locking mechanism forms a second passing path in the open end through which the injection head body can pass, and the cross-sectional area of ​​the first passing path is smaller than the cross-sectional area of ​​the second passing path.

[0057] According to the injection assembly and the injection system including the injection assembly of the present invention, by providing a shell body and a medicine taking needle in the shell body, it is convenient to place the medicine storage bottle in the shell body for taking medicine, which improves the stability of the medicine storage bottle and prevents it from tipping over, and on the other hand, it can avoid the user holding it, saving manpower. In addition, by coupling the shell assembly with the injection head body, it is convenient to extract the liquid medicine in the medicine storage bottle into the injection head body, thereby facilitating the injection operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] In order to better understand the above and other purposes, features, advantages and functions of the present invention, reference may be made to the preferred embodiments shown in the accompanying drawings. The same or similar reference numerals in the accompanying drawings refer to the same or similar components. It should be understood by those skilled in the art that the accompanying drawings are intended to schematically illustrate the preferred embodiments of the present invention and have no limiting effect on the scope of the present invention, and the components in the drawings are not drawn to scale.

[0059] Figure 1 A three-dimensional schematic diagram of an injection assembly according to a first preferred embodiment of the present invention;

[0060] Figure 2 for Figure 1 An exploded schematic diagram of the injection assembly in FIG.

[0061] Figure 3 for Figure 1 Another three-dimensional schematic diagram of the injection assembly in FIG. 1, but the up and down directions in the drawing are different from Figure 1 on the contrary;

[0062] Figure 4 for Figure 3 An exploded schematic diagram of the injection assembly in FIG.

[0063] Figure 5 for Figure 1 A schematic cross-sectional view of the injection assembly shown in , which shows that the drug storage bottle is about to be placed in the injection assembly;

[0064] Figure 6 for Figure 1 A schematic cross-sectional view of an injection assembly shown in , showing that the drug storage bottle has been placed in place in the injection assembly;

[0065] Figure 7 for Figure 1 A three-dimensional schematic diagram of a medicine extraction needle of an injection assembly shown in FIG.

[0066] Figure 8 for Figure 6 A schematic cross-sectional view of a medicine taking needle shown in ;

[0067] Fig. 9 is a three-dimensional schematic diagram of a medicine extraction needle of an injection assembly according to another preferred embodiment;

[0068] Fig.10 for Fig. 9 A schematic cross-sectional view of a medicine taking needle shown in ;

[0069] Fig.11 is a three-dimensional schematic diagram of a medicine extraction needle of an injection assembly according to another preferred embodiment;

[0070] Fig.12 for Fig.11 A schematic cross-sectional view of a medicine taking needle shown in ;

[0071] Fig.13 for Figure 11-Figure 12 The schematic diagram of the medicine extraction needle when combined with the medicine storage bottle is shown;

[0072] Fig.14 and Fig.15 for Figure 1The schematic cross-sectional view of the injection assembly shown shows different stages of drug extraction;

[0073] Fig.16 for Figure 1 A schematic diagram of an injection assembly shown, wherein the injection assembly is cut away to clearly show its internal structure;

[0074] Fig.17 for Figure 1 A three-dimensional schematic diagram of the injection head body of the injection assembly shown;

[0075] Fig.18 for Fig.14 A partial enlarged schematic diagram of part A shown in FIG.

[0076] Fig.19 and Fig. 20 for Figure 1 The schematic cross-sectional view of the injection assembly shown shows the state where the operating handle is rotated and the state where the operating handle is removed after the extraction of the liquid medicine is completed;

[0077] Fig.21 and Fig. 22 They are Figure 1 The schematic cross-sectional view of the injection assembly shown is before and after the operating handle is rotated, wherein the operating handle is cut away to clearly show its internal structure;

[0078] Figure 23-Figure 25 Schematic diagrams of the injection system in different states according to the first preferred embodiment of the present invention are respectively shown;

[0079] Fig.26 A perspective schematic diagram of an injection assembly according to a second preferred embodiment of the present invention;

[0080] Fig. 27 for Fig.26 An exploded schematic diagram of the injection assembly in FIG.

[0081] Fig.28 for Fig.26 A further exploded perspective view of the injection assembly in FIG.

[0082] Fig.29 for Fig.26 A schematic cross-sectional view of the injection assembly shown in , which shows that the drug storage bottle is about to be placed in the injection assembly;

[0083] Fig.30 for Fig.26 A schematic cross-sectional view of an injection assembly shown in , showing that the drug storage bottle has been placed in place in the injection assembly;

[0084] Figure 31-Figure 33 for Fig.26A schematic cross-sectional view of the injection assembly is shown, showing different stages of drug extraction; and

[0085] Fig.34 and Fig.35 They are Fig.26 Schematic diagram of the injection assembly at different stages of injection is shown. DETAILED DESCRIPTION

[0086] Below, the injection assembly according to the preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. The following is only a preferred embodiment of the present invention, and those skilled in the art can think of other ways to implement the present invention based on the preferred embodiment, and other ways also fall within the scope of the present invention.

[0087] The present invention provides an injection assembly. First of all, it should be noted that the directional terms and positional terms mentioned in the present invention should be understood as relative directions and relative positions. The directional terms and positional terms mentioned in the present invention can be understood with reference to the accompanying drawings. For example, the "axial direction" and "axial direction" mentioned in the present invention can be understood as the direction along the attached drawings. Figure 6 XX direction or parallel to the attached Figure 6 The XX direction in the present invention; the “radial direction”, “radial direction”, “circumferential direction”, “circumferential direction”, etc. mentioned in the present invention are all directions about the XX axis; the “rotational direction” mentioned in the present invention can be understood as the direction of rotation around the XX axis, which is roughly equivalent to the “circumferential direction”.

[0088] Figure 1-Figure 35 The present invention shows an injection assembly and an injection system including the injection assembly according to some preferred embodiments of the present invention. Figure 1-Figure 35 Taking the needle-free injection assembly as an example, it can be understood that the present invention can be applied to the needle injection assembly. The injection assembly of the present invention can accurately absorb the liquid to be injected into the injection cavity in the injection head body (i.e., the drug absorption step to be described later), so as to accurately determine the injection dose. Such an injection assembly can adopt both needle-free injection and needle injection. Furthermore, the injection assembly of the present invention can also realize the switching between needle-free and needle-injection methods. For example, by installing an injection needle on the injection micropore of the injection head body, the injection method of the syringe can be switched from needle-free injection to needle injection.

[0089] Implementation Method 1

[0090] References below Figure 1-Figure 25 An injection assembly and an injection system according to a first preferred embodiment of the present invention are described in detail.

[0091] like Figure 1-Figure 5As shown, the injection assembly 1 generally includes an injection head body 2, a piston assembly 3, a housing assembly 4 and an operating handle 5. The injection head body 2 is roughly constructed in a cylindrical shape, and has an injection cavity 7 inside. The end of the injection head body 2 is provided with an injection micropore 6 connecting the injection cavity 7 and the outside. When an injection operation is intended, the injection head body 2 can be pressed on the injection site, such as the patient's skin. When the injection operation (described below) 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 arranged in the injection cavity 7. The operating 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 can accommodate a medicine storage bottle 8. Each component is described in detail below.

[0092] Shell assembly 4

[0093] like Figure 1-Figure 4 As shown, the housing assembly 4 includes a housing body 9, a medicine extraction 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 bottle, etc.), and can accommodate a medicine storage bottle 8. The housing body 9 has an open end 12 and a coupling 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 coupling end 13 can be used to engage with the injection head body 2.

[0094] The medicine taking needle 10 can be engaged inside the shell body 9. Figure 7 and Figure 8 As shown, the medicine taking needle 10 includes a needle rod 14 and a medicine taking passage 15 opened 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 can enter the injection cavity 7. One end of the medicine taking passage 15 has a medicine taking port 16 connected thereto. Figure 2 and Figure 4 As shown, the medicine taking needle 10 also includes a base 17 connected to the needle rod 14, and the base 17 is generally disc-shaped and connected to the end of the needle rod 14 opposite to the needle head. The medicine taking needle 10 can be placed at the joint end 13 of the shell body 9 via the base 17. When the medicine taking needle 10 is placed in place inside the shell body 9, the needle head faces the open end 12 of the shell body 9. Therefore, when the medicine storage bottle 8 is placed in the shell body 9, the needle head can pierce the sealing plug on the medicine storage bottle 8, so that the liquid medicine in the medicine storage bottle can enter the injection cavity 7 via the medicine taking port 16 and the medicine taking passage 15.

[0095] When extracting the liquid medicine in the medicine storage bottle 8, the medicine storage bottle 8 is usually placed in an inverted vertical state, such as Figure 5 and Figure 6 As shown, in order to facilitate the liquid medicine in the medicine storage bottle 8 to be fully absorbed 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 head, 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 in the medicine storage bottle 8 when extracting the medicine.

[0096] Preferably, if Figure 7-10 As shown, an air passage 18 is also provided in the medicine dispensing needle 10, and the air passage 18 and the medicine dispensing passage 15 are provided independently of each other. By providing the air passage 18, air can be easily allowed to 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, which would affect the medicine dispensing effect. This solution is particularly suitable for medicine storage bottles whose internal volume does not change with the extraction of the internal medicine liquid, such as vials. The outlet of the air passage 18 can be opened at the needle end of the needle rod 14, so that the air passage 18 is longer than the medicine dispensing passage 15. The outlet of the air passage 18 can be on the same side as the medicine dispensing port 16, such as Figure 7 and Figure 8 In another embodiment, the outlet of the air passage 18 may be located at a different side from the medicine dispensing port 16, such as Fig. 9 and Fig.10 As shown, those skilled in the art can make settings according to actual needs.

[0097] For a medicine storage bottle whose internal volume decreases as the amount of medicine decreases, such as a cartridge bottle, the air passage can be omitted in the medicine extraction needle 10. Fig.11 and Fig.12 shown.

[0098] As is known to all, the sealing plug 19 of the medicine storage bottle 8 is usually made of elastic material, so that the medicine extraction needle 10 can pierce the sealing plug 19 and enter the medicine storage cavity to extract medicine. Due to the friction between the sealing plug 19 and the medicine extraction needle 10, when the medicine extraction needle 10 pierces the sealing plug 19, the part of the sealing plug 19 that contacts the medicine extraction needle 10 will be deformed and bulge toward the inside of the medicine storage bottle 8. It can be understood that when the medicine extraction port on the medicine extraction needle is located lower, the bulging part of the sealing plug will wrap around the medicine extraction port like a volcano, causing the medicine extraction passage to be blocked by the bulging part of the sealing plug, affecting the extraction of the liquid medicine in the medicine storage bottle.

[0099] In order to avoid the above situation, Figure 7-Figure 13As shown, the outer periphery of the needle rod 14 is provided with a smooth protruding structure 20 protruding outward along the radial direction of the needle rod 14, the protruding structure 20 is provided close to the medicine dispensing port 16, and the outer surface of the protruding structure 20 is constructed as an arc surface. Preferably, the point on the protruding structure 20 that is farthest from the outer periphery of the needle rod 14 (that is, the most convex point) is higher than the "upward" elastic deformation vertex generated when the sealing plug 19 is deformed. By providing the protruding structure 20 on the outer side of the needle rod 14, the elastic sealing plug 19 tends to shrink toward the smaller cross-sectional area of ​​the protruding structure 20 when the medicine dispensing needle 10 punctures through the sealing plug 19 of the medicine storage bottle 8, so that the sealing plug 19 will slide "downward" along the curve of the "lower" end of the protruding structure 20, thereby changing the deformation of the sealing plug 19, reducing the protrusion of the sealing plug 19 to the inside of the medicine storage bottle 8, and thus preventing the sealing plug 19 from blocking the medicine dispensing port 16 and the medicine dispensing passage 15. The directional terms "upper" and "lower" mentioned here are only relative to the setting position of the medicine taking needle in the figure, and are not limiting. In addition, this solution can also realize setting the medicine taking port 16 of the medicine taking passage 15 lower to achieve more sufficient medicine taking.

[0100] In a preferred embodiment, the raised structure 20 has a first projection on a vertical plane parallel to the axial direction of the needle rod 14, and the medicine dispensing port 16 has a second projection on the vertical plane, and at least a portion 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 dispensing port 16 may be partially within the range of the axial extension of the raised structure 20, or the axial extension of the medicine dispensing port 16 may be entirely within the range of the axial extension of the raised structure 20. Further preferably, the entirety of the second projection is within the axial radiation range of the first projection. That is to say, the axial extension of the medicine dispensing port 16 is entirely within the range of the axial extension of the raised structure 20, such as Figure 7-Figure 13 shown.

[0101] The raised structure 20 can be continuously arranged around the circumferential direction of the needle rod 14, or the raised structure 20 can be arranged at intervals around the circumferential direction of the needle rod 14. Those skilled in the art can arrange it according to actual needs. The raised structure 20 can be radially spaced apart from the outer periphery of the needle rod 14, or it can be closely attached to the outer periphery of the needle rod 14. In the preferred embodiment shown in the figure, the raised structure 20 is roughly constructed in the shape of an arc handle, and the raised structure 20 is roughly located radially outside the medicine dispensing port 16, and the two ends of the raised structure 20 are respectively attached to the needle rod 14 above and below the medicine dispensing port 16, and the protruding part of the raised structure 20 is arranged at intervals from the outer periphery of the needle rod 14 to expose the medicine dispensing port 16. It should be noted that the directional terms "upper" and "lower" mentioned here are relative to the orientation of the medicine dispensing needle 10 shown in the figure, and are not restrictive.

[0102] Continue to refer Figure 1-Figure 4The housing assembly 4 further includes a substantially circular elastic gasket 11, which 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. Fig.18 As shown, the elastic gasket 11 is provided with a first through hole 21 communicating with the medicine taking passage 15 and a second through hole 22 communicating with the air passage 18 .

[0103] It can be understood that for a medicine storage bottle 8 with a fixed internal volume, such as a cillin bottle, when the drug solution is sucked into the injection cavity 7, a negative pressure is generated inside the medicine storage bottle 8. When the negative pressure acts on the elastic gasket 11, the elastic gasket 11 is deformed, causing one end of the gasket to tilt "upward", such as Fig.18 Thus, external air can be replenished into the medicine storage bottle 8 from the gap between the shell body 9 and the elastic gasket 11 through the second through hole 22 and the air passage 18, so that the pressure inside and outside the medicine storage cavity is balanced, so as to smoothly and continuously absorb the medicine liquid therefrom.

[0104] like Figure 4 and Fig.18 As shown, preferably, a circular first positioning opening 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 portion of the positioning flange 24 extends into the first positioning opening 23, and the first through hole 21 is provided on the positioning flange 24. This solution can facilitate the assembly of the elastic gasket on the joint end 13 on the one hand, and prevent the position of the elastic gasket 11 from being offset on the other hand.

[0105] like Figure 5 As 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 of the medicine taking needle 10 facing the open end 12 to limit the position of the medicine taking needle 10.

[0106] During the assembly process of the shell assembly 4, the elastic gasket 11 and the medicine removal needle 10 can be placed in the shell body 9 in sequence. When the elastic gasket 11 and the medicine removal 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 removal needle 10 to limit its position, thereby achieving a stable combination of the medicine removal needle 10, the elastic gasket 11 and the shell body 9.

[0107] The process of installing the medicine storage bottle 8 can be as follows Figure 5 and Figure 6 As 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 connection between the injection cavity 7 and the inside of the medicine storage cavity.

[0108] In this embodiment, the injection micropore 6 is disposed at the first end of the injection head body 2, and the first end of the injection head body 2 is connected to the connection end 13 of the shell body 9. The injection micropore 6 is connected to the drug extraction passage 15 via the first through hole 21 on the elastic gasket 11.

[0109] refer to Figure 4 , a first snap-fit ​​portion 26 is provided on the outer side of the joint end 13 of the shell body 9 (that is, the side facing the injection micropore 6), and a circle of snap-fit ​​flanges 27 are provided on the first end of the injection head body 2, and the snap-fit ​​flanges 27 can be snap-fitted to the first snap-fit ​​portion 26, so that the shell body 9 and the injection head body 2 are joined. In order to further achieve a stable joint between the shell body 9 and the injection head body 2, preferably, a plurality of first snap-fit ​​portions 26 evenly spaced along the circumferential direction are provided on the outer side of the joint end 13. Exemplarily, in the illustrated embodiment, four first snap-fit ​​portions 26 are provided on the outer side of the joint end 13. It can be understood that those skilled in the art can also provide other numbers of first snap-fit ​​portions 26 as needed. In other embodiments not shown, the snap-fit ​​portion can also be provided on the injection head body, and the snap-fit ​​flange or the snap-fit ​​groove can be provided on the shell body.

[0110] Operating handle

[0111] 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 in the injection cavity 7. In actual use, the user can drive the piston assembly 3 combined with the operating handle 5 to aspirate the liquid medicine by pulling it backward. If bubbles are found in the liquid medicine aspirated into the injection cavity 7 during the aspiration process, the operating handle 5 can be pushed forward to expel the bubbles. The liquid medicine extraction process will be described in detail below.

[0112] The operating handle 5 is configured to automatically stop moving when it reaches a predetermined position during the process of extracting the liquid medicine, that is, the operating handle 5 has a stroke limit during the process of extracting the liquid medicine. By setting the stroke limit, a fixed dose of liquid medicine can be extracted, so that the solution can quickly and accurately extract a fixed dose of liquid medicine.

[0113] Preferably, the operating handle 5 is detachably connected to the injection head body 2. When the operating handle 5 is intended to be removed from the injection head body 2, the operating handle 5 can be rotated, and when the operating handle 5 is rotated into place, it can be easily removed from the injection head body 2, which will be described in detail below.

[0114] like Figure 2 as well as Figure 14-17As shown, the operating handle 5 includes a shell portion 28 and a joint portion 29 disposed inside the shell portion 28. The shell portion 28 is roughly cylindrical, and the joint portion 29 is also roughly cylindrical and is arranged concentrically with the shell portion 28. The shell portion 28 can be sleeved on the outside of the injection head body 2, and the injection head body 2 has an open opening portion 30 at one end. When the shell portion 28 is sleeved on the outside of the injection head body 2, the joint portion 29 can extend to the inside of the injection head body 2 through the opening portion 30 and be detachably connected to the piston assembly 3.

[0115] Preferably, the joint portion 29 is provided with a snap-fit ​​structure 31 , the piston assembly 3 includes a piston 32 and a base 33 tightly connected to the piston 32 , and the base 33 is provided with a slot structure 34 that cooperates with the snap-fit ​​structure 31 .

[0116] In a preferred embodiment, Fig.15 and Fig. 22 As 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.

[0117] like Fig.21 and Fig. 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. Fig.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 Fig. 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.

[0118] 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.

[0119] like Fig.16 and Fig.17 As shown, the injection assembly 1 further comprises a limiting structure, which is 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.

[0120] 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 portion 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 shell portion 28, and the first protrusion 41 can cooperate with the first groove 40, and the first protrusion 41 and the first groove 40 together constitute a set of limiting structures. Preferably, the first protrusion 41 has a predetermined length in the axial direction of the shell portion 28, and the predetermined length of the first protrusion 41 is set to ensure that the first protrusion 41 can always be engaged in the first groove 40 before the operating handle 5 moves to the above-mentioned predetermined position, and when the operating handle 5 moves to the predetermined position, the first protrusion 41 can be disengaged from the first groove 40, thereby avoiding obstruction of the rotation of the operating handle 5 relative to the injection head body 2.

[0121] Further preferably, the injection assembly 1 includes two sets of limiting structures symmetrically arranged relative to the central axis of the injection head body 2, that is, the first flange portion 39 is provided with two first grooves 40 symmetrically arranged relative to the central axis of the injection head body 2, and the inner surface of the shell portion 28 is provided with two first protrusions 41 symmetrically arranged relative to the central axis of the injection head body 2. It can be understood that in other embodiments not shown, the first groove 40 can also be provided on the shell portion 28, and the first protrusion 41 can be provided on the first flange portion 39.

[0122] Preferably, the injection assembly 1 also includes a stop structure, which is constructed to limit further axial movement of the operating handle 5 relative to the injection head body 2 when the operating handle 5 moves to a predetermined position relative to the injection head body 2, thereby achieving fixed dose of liquid medicine extraction.

[0123] Continue to refer Fig.16 and Fig.17 In a preferred embodiment, a second protrusion 42 is further provided on the inner surface of the shell portion 28, and the second protrusion 42 is provided at the end of the shell portion 28 close to the injection head body 2. The injection head body 2 also 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 stopper plate 44 extending a predetermined distance along its circumferential direction is provided on the second flange portion 43, the stopper plate 44 is recessed in the axial direction of the second flange portion 43 along the direction toward the opening portion 30, and the stopper plate 44 is configured to be able to block the axial movement of the second protrusion 42, and the second protrusion 42 and the stopper plate 44 together constitute a set of stop structures.

[0124] Preferably, the injection assembly 1 includes two sets of stop structures that are rotationally symmetrically arranged relative to the central axis of the injection head body 2. That is, the second flange portion 39 is provided with two stop disks 44 that are rotationally symmetrically arranged relative to the central axis of the injection head body 2, and the inner surface of the shell portion 28 is provided with two second protrusions 42 that are rotationally symmetrically arranged relative to the central axis of the injection head body 2.

[0125] like Fig.17 As shown, the second flange portion 43 is also provided with a second groove 45, which is communicated with the concave portion of the stop plate 44. The position of the second groove 45 corresponds to the position of the first groove 40, that is, 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, the first protrusion 41 can engage with 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.

[0126] In a preferred embodiment, the second protrusion 42 is spaced apart from the first protrusion 41 in both the axial direction and the circumferential direction of the housing 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 plate 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 plate 44.

[0127] The drug aspiration process of the injection assembly is described in detail below.

[0128] When the user intends to extract the liquid medicine, the user can pull the operating handle 5 in the direction away from the medicine storage bottle 8, and the operating handle 5 drives the piston assembly 3 to move synchronously. When the extraction operation is performed, the first protrusion 41 on the operating handle 5 interacts with the first groove 40 on the injection head body 2 to prevent unexpected relative rotation between the operating handle 5 and the injection head body 2. When the operating handle 5 moves axially to a predetermined position, the second protrusion 42 on the operating handle 5 is blocked by the stop plate 44 on the injection head body 2, so that the operating handle 5 cannot move further axially. The distance that the operating handle 5 is pulled before the second protrusion 42 contacts the stop plate 44 determines the dosage of the medicine. When the second protrusion 42 on the operating handle 5 is blocked by the stop plate 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.

[0129] like Fig.19 and Fig. 20 As shown, when the operating handle 5 is intended to be removed from the injection head body 2, the operating handle 5 can be rotated first. Since the second protrusion 42 is against the concave stop plate 44 at this time, one end is blocked by the stop plate 44, so that the second protrusion 42 can only rotate in the direction toward the second groove 45. When the second protrusion 42 is rotated to align 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 be smoothly separated from the injection head body 2.

[0130] The injection assembly 1 according to this embodiment can be used in conjunction with a pushing device 46 to perform an injection operation, and 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 Fig.23 As shown, the pushing device 46 includes a housing 48, a push rod 49 disposed inside the housing, and a locking mechanism 50, and the push rod 49 can be pushed to move relative to the housing 48. At least a portion 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 toward the injection micropore 6 when performing an injection operation.

[0131] The housing 48 has an open end 51, and a locking mechanism 50 is disposed at the open end 51. The locking mechanism 50 can move between a locked position and an unlocked position. Fig.24 and Fig.25 As shown, when the locking mechanism 50 is in the locked position, the locking mechanism 50 forms a first passage in the open end 51. The cross-sectional area of ​​the first passage is small, which can facilitate the positioning of the injection head body 2. Fig.23As shown, when the locking mechanism 50 is in the unlocked position, the locking mechanism 50 forms a second passage in the open end 51, and the second passage has a larger cross-sectional area, allowing the injection head body 2 to pass smoothly. Preferably, the cross-sectional area of ​​the first passage is smaller than the cross-sectional area of ​​the second passage.

[0132] In one embodiment, the locking mechanism 50 can be configured as a snap-fit ​​structure arranged along the circumferential direction of the pushing device 46, and the snap-fit ​​structure can be moved radially inward to a locked position, or can be moved radially outward to an unlocked position. The locking mechanism 50 can be in an unlocked position before the injection head body 2 is engaged with the housing 48, and when the injection head body 2 is installed in place in the pushing device 46, the locking mechanism 50 can be moved radially inward to a locked position where it is snapped to 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, and the rotating blocks can be rotated in the open end to form passages with different cross-sectional areas respectively.

[0133] like Fig.24 As shown, after the injection head body 2 is mounted on the pushing device 46, the locking mechanism 50 can be operated to lock the injection head body 2 to limit 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 micropore 6. When the 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 drug solution is ejected from the injection micropore 6 to perform the injection, as shown in FIG. Fig.25 shown.

[0134] Implementation Method 2

[0135] References below Figure 26-Figure 33 The injection assembly 101 according to the second preferred embodiment of the present invention will be described in detail.

[0136] In this embodiment, if Figure 26-Figure 29 As shown, the injection head body 102 has a first end 180 and a second end 181 opposite to the first end, the injection micropore 106 is arranged at the first end 180, and the second end 181 of the injection head body 102 is connected to the connection end 113 of the shell body 109. In other words, the injection micropore 106 is arranged at an end of the injection head body 102 away from the shell assembly 104.

[0137] like Fig.29 and Fig.30As shown, in this embodiment, the piston assembly 103 includes a piston 132 and a piston rod 160, and one end of the piston rod 160 is engaged with the piston 132. One end of the piston 132 is configured as a cone, and the injection cavity has a shape matching the cone-shaped piston. The tip of the cone can be inserted into the injection micropore 106. A first passage 161 is provided in the piston 132. In the preferred embodiment shown in the figure, the first passage 161 is arranged at an angle 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, and preferably, the second passage 162 extends in 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 be communicated with the second passage 162, and the second passage 162 is communicated with the drug taking passage 115 via the first through hole 121 on the elastic gasket 111.

[0138] The process of installing the medicine storage bottle 8 is similar to the process described in the first embodiment. Fig.29 and Fig.30 As shown, the medicine storage bottle 8 can be pressed into the shell body 109 from the open end 112 of the shell body 109, and the medicine taking needle 110 pierces the sealing plug 19 of the medicine storage bottle 8 to form a connection between the injection cavity 107 and the inside of the medicine storage cavity.

[0139] refer to Figure 27-Figure 29 The piston assembly 103 further includes a piston cap 163, which 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 integrally formed as a single piece. The piston cap 163 is connected to the engagement end 113 of the shell body 109 and substantially closes the engagement end 113 of the shell body 109.

[0140] In a preferred embodiment, a circular second positioning opening 164 is provided at a substantially central position of the piston cap 163, and the second positioning opening 164 is connected to the second passage 162 in the piston rod 160. A positioning flange 124 is provided on the elastic gasket 111. Fig.30 As shown, in the assembled state, a portion of the positioning flange 124 extends into the second positioning opening 164, and the first through hole 121 is formed on the positioning flange 124. This solution can facilitate the assembly of the elastic gasket on the piston cap, and can prevent the position of the elastic gasket 111 from being offset. Fig.32 As shown, the piston cap 163 is also provided with an air inlet 182, which can be communicated with the second through hole 122 on the elastic gasket 111. The air inlet 182 can facilitate the air to enter the medicine storage cavity during the process of extracting the medicine liquid.

[0141] Continue to refer Fig.28, the piston cap 163 and the shell body 109 are respectively provided with mutually cooperating snap-fit ​​structures. In a preferred embodiment, a plurality of snap-fit ​​openings 165 are provided on the piston cap 163 near the periphery, and a plurality of snap-fit ​​buckles 166 extending toward the piston cap 163 are provided on the periphery of the shell body 109, and the plurality of snap-fit ​​buckles 166 are respectively matched with the plurality of snap-fit ​​openings 165 to achieve the connection between the shell body 109 and the piston cap 163. The snap-fit ​​openings 165 and the snap-fit ​​buckles 166 together constitute the snap-fit ​​structure. Exemplarily, in the illustrated embodiment, the number of the snap-fit ​​openings 165 and the snap-fit ​​buckles 166 are four respectively. It can be understood that in other embodiments not shown, those skilled in the art can set other numbers of snap-fit ​​openings 165 and snap-fit ​​buckles 166 according to actual needs, or the snap-fit ​​openings can be set on the shell body, the snap-fit ​​buckles can be set on the piston cap, or the snap-fit ​​structure can be set in other forms.

[0142] During the assembly process of the shell assembly 104, the elastic gasket 111 and the medicine removal needle 110 can be placed on the piston cap 163 in sequence, and then the shell body 109 and the piston cap 163 can be mutually locked by utilizing the snap-fit ​​structure on the shell body 109 and the piston cap 163, thereby fixing the elastic gasket 111 and the medicine removal needle 110.

[0143] like Figure 26-Figure 30 As shown, in this embodiment, the injection assembly 101 further includes an end cap 167, which can be sleeved on the injection head body 102 from the first end 180 of the injection head body 102 (that is, the end where the injection micropore 106 is provided). An elastic seal 168 is provided in the end cap 167, and the elastic seal 168 is sealed around the injection micropore 106 and is provided at the first end 180 of the injection head body 102. The elastic seal 168 can seal the injection micropore 106 when extracting the drug solution, thereby forming a vacuum inside the injection cavity 107 to ensure that the drug extraction function is smoothly realized.

[0144] Preferably, the elastic seal 168 has an initial state and a deformed state. Fig.29 As shown, in the initial state, the elastic seal 168 is partially spaced apart from the first end 180 of the injection head body 102, and a sealed space is formed between the elastic seal 168 and the first end 180 of the injection head body 102, and in the deformed state, the elastic seal 168 is squeezed in the direction toward the injection micropore 106, so that the air in the sealed space can be discharged to form a negative pressure in the sealed space.

[0145] like Fig.29 and Fig.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 is engaged in the through hole 171. The sealing portion 170 is preferably configured as a bowl-shaped suction cup structure, and 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.

[0146] 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 and rebound effect of the elastic seal 168, the gas inside the piston assembly 103 and the medicine removal needle 110 will be first discharged into the sealed space formed between the elastic seal 168 and the first end 180 of the injection head body 102. Preferably, the structure of the elastic seal 168 and the stroke that can be compressed can be set as needed, so that the desired and controllable air discharge amount can be obtained, so as to achieve the effect of avoiding the generation of bubbles inside the injection cavity and not wasting too much liquid medicine. Preferably, the elastic seal 168 can be made of a flexible material such as rubber.

[0147] Preferably, if Fig.29 As shown, in the initial state of the elastic seal 168, there is a certain gap 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 along the axial direction, and the axial distance d of the gap is roughly equal to the axial deformation of the elastic seal 168.

[0148] like Fig.31 As shown, a plurality of second snap-fit ​​portions 172 are provided in the end cap 167 near the elastic seal 168, and a circle of snap-fit ​​flange 127 is provided at the first end of the injection head body 102. The snap-fit ​​flange 127 is constructed to be snap-fitted to the second snap-fit ​​portions 172, thereby achieving a stable connection between the end cap 167 and the injection head body 102.

[0149] Return to reference Fig. 27 and Fig.28 Preferably, the inner side wall of the end cap 167 is provided with a plurality of guide ribs 173 extending in the axial direction thereof. The plurality of guide ribs 173 are evenly spaced apart in the circumferential direction of the end cap 167. The injection head body 102 is accommodated in the area surrounded by the plurality of guide ribs 173. This solution can prevent the position of the injection head body 102 from being offset, and can keep the injection head body 102 in the proper position at all times. In the illustrated embodiment, the inner side wall of the end cap 167 is provided with four guide ribs 173 extending in the axial direction thereof. It can be understood that in other embodiments not shown, the inner side wall of the end cap 167 can be provided with other numbers of guide ribs 173.

[0150] like Figure 27-Figure 30 As shown, the end cap 167 is roughly constructed into a cylindrical shape 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 larger than the cross-sectional diameter of the second cap portion 175. The guide rib 173 is arranged on the first cap portion 174, and the second snap portion 172 and the elastic seal 168 are arranged on the second cap portion 175.

[0151] The drug aspiration process of the injection assembly is described in detail below.

[0152] like Fig.29 and Fig.30 As shown, when installing the medicine storage bottle 8, in order to complete the puncture action of puncturing the sealing plug 19 of the medicine storage bottle 8, the operator needs to hold the end cap 167 and press it toward the medicine storage bottle 8 to make it abut against the injection head body 102. At this time, the movement distance of the end cap 167 is the axial distance d of the above-mentioned gap. During the pressing process, the elastic sealing member 168 inside the end cap 167 will be squeezed and deformed (such as Fig.30 As shown), the originally enclosed gas inside the sealed space is discharged. 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 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 body 102.

[0153] like Fig.31 As shown in FIG. 1 , at the moment when the piston assembly 103 starts to draw, the piston assembly 103 is slightly displaced 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 body 102 will actively suck the air in the liquid passage inside the piston assembly 103 and guide it to the closed space formed between the elastic seal 168 and the first end 180 of the injection head body 102. The guiding path of the air is shown in FIG. Fig.31 With this design, the gas in the medicine liquid passage inside the piston assembly 103 can be reduced or eliminated, and bubbles can be avoided when the medicine liquid is sucked into the injection cavity 107.

[0154] like Fig.32As shown, during the process of extracting the drug solution, the piston assembly 103 continues to move away from the injection micropore 106. Since the injection micropore 106 is sealed by the elastic seal 168, a negative pressure is generated in the space formed between the injection cavity 107 and the piston 132. The negative pressure causes 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, thereby forming a drug solution passage from the drug storage bottle 8 to the injection cavity 107. Fig.32 In addition, as described in the first embodiment, due to the pressure difference between the inside and outside of the medicine storage cavity, the elastic gasket 111 will deform, so that the external air is replenished into the medicine storage cavity. Fig.32 As shown by the arrow on the left, this solution facilitates the extraction of the drug solution.

[0155] like Fig.33 As shown, the piston assembly 103 moves to the predetermined position, and the extraction of the liquid medicine is completed. The piston 132 restores its original shape, so that 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. In addition, 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 medicine storage chamber.

[0156] like Fig.34 and Fig.35 As 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), and the pushing device drives the piston assembly 103 to move toward the injection micropore 106, so that the piston 132 can push the liquid medicine inside the injection cavity 107 to be ejected from the injection micropore 106 at the end of the injection cavity 107. Squeezed by the liquid medicine inside the injection cavity 107, the piston 132 will be tightly fitted 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 to the medicine storage cavity.

[0157] The mating features such as protrusions, grooves, flanges, snaps, etc. in each mating structure group provided in this embodiment can be a structure that extends in the circumferential direction and is intermittently arranged, or a structure that is continuously arranged in the circumferential direction, and the injection assembly can make some structural adjustments accordingly.

[0158] In addition, although the embodiment of the present invention takes a needle-free syringe as an example, the structure of the present invention can also be applied to a syringe with a needle.

[0159] The above description of various embodiments of the present invention is provided to one of ordinary skill in the relevant art for the purpose of description. It is not intended that the present invention be exclusive or limited to a single disclosed embodiment. As above, a person of ordinary skill in the field of the above teachings will understand the various substitutions and variations of the present invention. Therefore, although some alternative embodiments are specifically described, a person of ordinary skill in the art will understand or relatively easily develop other embodiments. The present invention is intended to include all substitutions, modifications and variations of the present invention described herein, as well as other embodiments that fall within the spirit and scope of the present invention described above.

Claims

1. An injection assembly, characterized in that: The injection assembly is a needle-free injection assembly, comprising: An injection head body, wherein an injection cavity is disposed in the injection head body, and an injection microhole is disposed at a first end of the injection head body; a piston assembly configured to be movable within the injection chamber; and A housing assembly, the housing assembly comprising: A shell body, the shell body having an open end and a coupling end opposite to the open end, the open end being capable of allowing a medicine storage bottle to enter the shell body, and the coupling end being coupled to the injection head body; A medicine taking needle, the medicine taking needle is arranged inside the shell body, and the medicine taking needle is provided with a medicine taking passage which can communicate with the outside and the injection cavity, An end cap, wherein the end cap is sleeved on the injection head body from the first end, wherein an elastic seal is arranged in the end cap, wherein the elastic seal is sealed around the injection micropore and arranged at the first end of the injection head body, wherein the elastic seal includes a sealing portion, wherein the sealing portion is constructed as a bowl-shaped suction cup structure, and wherein the periphery of the sealing portion can abut against the first end of the injection head body.

2. The injection assembly according to claim 1, characterized in that The shell assembly also includes an elastic gasket, which is arranged in the shell body. The elastic gasket is arranged closer to the injection head body than the medicine extraction needle. The elastic gasket is provided with a first through hole connected to the medicine extraction passage.

3. The injection assembly according to claim 2, characterized in that The medicine taking needle is also provided with an air passage, and the air passage and the medicine taking passage are provided independently of each other.

4. The injection assembly according to claim 3, characterized in that The length of the air passage is greater than the length of the medicine taking passage.

5. The injection assembly according to claim 3, characterized in that: The elastic gasket is provided with a second through hole communicating with the air passage.

6. The injection assembly according to claim 1, characterized in that The injector head body also has a second end opposite to the first end, the second end being closer to the engagement end of the shell body than the first end.

7. The injection assembly according to claim 2, characterized in that The piston assembly includes a piston and a piston rod, one end of the piston rod is engaged with the piston, a first passage is provided in the piston, a second passage that can be connected to the first passage is provided in the piston rod, and the second passage is connected to the medicine extraction passage via the first through hole.

8. The injection assembly according to claim 7, characterized in that The piston assembly further includes a piston cap connected to an end of the piston rod opposite to the piston, the piston cap being connected to the engagement end of the housing body.

9. The injection assembly according to claim 8, characterized in that The piston cap is provided with a second positioning opening, the elastic gasket is provided with a positioning flange, a part of the positioning flange extends into the second positioning opening, and the first through hole is opened on the positioning flange.

10. The injection assembly according to claim 8, characterized in that The piston cap and the piston rod are an integral piece.

11. The injection assembly according to claim 8, characterized in that The piston cap and the shell body are respectively provided with mutually matching clamping structures.

12. The injection assembly according to claim 11, characterized in that The piston cap is provided with a plurality of snap-fit ​​openings near the outer circumference, and the shell body is provided with a plurality of snap-fit ​​buckles matched with the plurality of snap-fit ​​openings, and the snap-fit ​​openings and the snap-fit ​​buckles together constitute the snap-fit ​​structure.

13. The injection assembly according to claim 1, characterized in that The elastic seal has an initial state and a deformed state. In the initial state, the elastic seal is partially spaced apart from the first end of the injection head body, and a sealed space is formed between the elastic seal and the first end of the injection head body. In the deformed state, the elastic seal is constructed to be able to be squeezed in a direction toward the injection micropore to form a negative pressure in the sealed space.

14. The injection assembly according to claim 1, characterized in that A through hole is provided at the end of the end cap, and the elastic sealing member further comprises a joint portion, the joint portion is connected to the sealing portion, and the joint portion is engaged in the through hole.

15. The injection assembly according to claim 13, characterized in that In the initial state of the elastic seal, there is a gap in the axial direction between the end of the end cap close to the second end of the injection head body and the injection head body, and the axial distance of the gap is roughly equal to the axial deformation of the elastic seal.

16. The injection assembly according to claim 13, characterized in that A second snap-fitting portion is arranged in the end cap near the elastic sealing member, and a circle of snap-fitting flange is arranged at the first end of the injection head body, and the snap-fitting flange is constructed to be snap-fitted to the second snap-fitting portion.

17. The injection assembly according to claim 16, characterized in that The inner side wall of the end cap is provided with a plurality of guide ribs extending along the axial direction thereof.

18. The injection assembly according to claim 17, characterized in that The end cap includes a first cap portion and a second cap portion connected to the first cap portion, the cross-sectional diameter of the first cap portion is larger than the cross-sectional diameter of the second cap portion, the guide rib is arranged on the first cap portion, and the second buckle portion and the elastic seal are arranged on the second cap portion.

19. An injection system, characterized in that: include: The injection assembly as claimed in any one of claims 1 to 18; as well as A pushing device, the pushing device includes a shell and a push rod arranged inside the shell, the push rod is movably arranged in the shell, at least a part of the injection head body can be engaged in the shell, and the push rod is constructed to be able to contact the piston assembly to push the piston assembly in the direction toward the injection micropore.

20. The injection system according to claim 19, characterized in that The push rod is configured to be engageable with the piston assembly to push the piston assembly in a direction toward the injection micro-hole.

21. The injection system according to claim 19, characterized in that The pushing device further comprises a locking mechanism, the housing having an open end, the locking mechanism being disposed at the open end, the locking mechanism being movable between a locked position and an unlocked position, When the locking mechanism is in the locking position, the locking mechanism forms a first passing path in the open end, and when the locking mechanism is in the unlocking position, the locking mechanism forms a second passing path in the open end through which the injection head body can pass, and the cross-sectional area of ​​the first passing path is smaller than the cross-sectional area of ​​the second passing path.

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