Injection head assembly and injection system

Abstract

The invention provides an injection head assembly and an injection system. The injection head assembly comprises an injection head and an injection cap. The injection head comprises a base and an injection body, an injection cavity is formed in the injection body, the injection body is provided with a connecting end and an injection end opposite to the connecting end, the connecting end is connected to the base, and injection micropores are formed in the injection end. The injection cap is provided with an opening part, and the injection cap can be arranged on the injection body in a sleeving mode through the opening part. Wherein a first guide part is arranged on the outer surface of the injection main body, a second guide part is arranged on the inner surface of the injection cap, and the first guide part and the second guide part are constructed to be capable of being matched with each other when the injection cap is installed on the injection head so as to guide the injection cap to be arranged on the injection main body in a sleeving mode according to a preset orientation. According to the scheme, the guide parts are respectively arranged on the injection head and the injection cap, so that the injection cap can be quickly and conveniently mounted on the injection head according to the preset orientation.

Description

Technical Field

[0001] The present invention relates to the field of medical devices, in particular to the field of needle-free injection. More specifically, the present invention relates to an injection head assembly and an injection system. Background Art

[0002] In the prior art, there is a medicine tube for a syringe, which includes a medicine tube body and a medicine tube cap that can be fitted onto the medicine tube body. When not in use, the medicine tube cap can be placed on the medicine tube body to protect it. Some medicine tubes are known to have mutually cooperating structures designed on the medicine tube body and the medicine tube cap. These cooperating structures can only function when the medicine tube cap is correctly fitted onto the medicine tube body. However, medicine tubes are relatively small in size and have a complex structure, which makes it difficult to correctly fit the medicine tube cap onto the medicine tube during the fitting process.

[0003] Therefore, it is necessary to provide an injection head assembly and an injection system 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 head assembly, the injection head assembly comprising:

[0005] An injection head, the injection head comprising a base and an injection body, the injection body forming an injection cavity therein, the injection body having a connecting end and an injection end opposite to the connecting end, the connecting end being connected to the base, and the injection end being provided with an injection microhole; and

[0006] An injection cap having an opening portion, wherein the injection cap is configured to be sleeved on the injection body through the opening portion,

[0007] A first guide component is provided on the outer surface of the injection body, and a second guide component is provided on the inner surface of the injection cap. The first guide component and the second guide component are constructed to cooperate with each other when the injection cap is installed on the injection head to guide the injection cap to be mounted on the injection body in a predetermined orientation.

[0008] Preferably, a first fastening structure is provided on the injection head, and a second fastening structure is provided on the injection cap. When the injection cap is installed on the injection body according to the predetermined orientation, the first fastening structure is connected to the second fastening structure.

[0009] Preferably, the first guide component includes a plurality of first guide ribs arranged at intervals around the outer periphery of the injection body, and the second guide component includes a plurality of second guide ribs arranged at intervals around the inner periphery of the injection cap, wherein, in the installed state, the projections of the plurality of first guide ribs on a horizontal plane perpendicular to the axial center line of the injection head and the projections of the plurality of second guide ribs on the horizontal plane are staggered with each other.

[0010] Preferably, the first guide component includes two first guide ribs, which are arranged on the outer surface of the injection body in the same orientation and are evenly spaced around the circumference of the injection body. The first guide ribs protrude from the outer surface of the injection body and have a shape extending along the circumference of the injection body.

[0011] Preferably, the first guide rib has a first guide surface facing the injection end, the first guide surface has a first end and a second end, and the first end is closer to the injection end than the second end.

[0012] Preferably, the second guide component includes two second guide ribs, which are arranged on the inner surface of the injection cap in the same orientation and are evenly spaced around the inner circumference of the injection cap, and the second guide ribs protrude from the inner surface of the injection cap and have a shape extending along the inner circumference of the injection cap.

[0013] Preferably, a radial distance between radial inner sides of two second guide ribs is smaller than a radial distance between radial outer sides of two first guide ribs.

[0014] Preferably, the second guide rib has a second guide surface facing the opening, the second guide surface has a third end and a fourth end, and the third end is closer to the opening than the fourth end.

[0015] Preferably, the first guide surface is configured such that when viewed in a clockwise direction from the injection end of the injection body, the first end is located downstream of the second end, and the second guide surface is configured such that when viewed in a clockwise direction from the opening of the injection cap, the third end is located upstream of the fourth end, or the first guide surface is configured such that when viewed in a clockwise direction from the injection end of the injection body, the first end is located upstream of the second end, and the second guide surface is configured such that when viewed in a clockwise direction from the opening of the injection cap, the third end is located downstream of the fourth end.

[0016] Preferably, the second guide rib extends along the axial direction of the injection cap to the bottom of the injection cap opposite to the opening, and a rib extending along the axial direction is further provided on the radial inner side of the second guide rib.

[0017] Preferably, a plurality of ribs are provided on the radial inner side of the second guide rib, the plurality of ribs are arranged at intervals in the circumferential direction of the injection cap, and the plurality of ribs are configured to abut against the outer periphery of the injection body in the installed state.

[0018] Preferably, the cross section of the injection cap is configured in a non-circular shape.

[0019] Preferably, the injection cap includes a first side surface, a second side surface, a third side surface and a fourth side surface connected to each other, the first side surface is arranged opposite to the second side surface, the third side surface is arranged opposite to the fourth side surface, the outer surfaces of the first side surface and the second side surface are roughly constructed as planes, and the outer surfaces of the third side surface and the fourth side surface are constructed as arc-shaped surfaces.

[0020] Preferably, the second guide component includes a plurality of second guide ribs, which are evenly spaced around the inner circumference of the injection cap, and the second guide ribs protrude from the inner surface of the injection cap and extend from the opening of the injection cap along the axial direction of the injection cap to the bottom of the injection cap.

[0021] Preferably, the end portion of the second guide rib close to the opening has a guide slope.

[0022] Preferably, the distance between the radial inner side of the second guide rib and the predetermined inner surface of the injection cap is smaller than the distance between the radial outer sides of the two first guide ribs, and the predetermined inner surface is the inner surface of the injection cap opposite to the radial inner side with respect to the axial center line of the injection cap.

[0023] Preferably, the injection cap is substantially configured in the shape of a triangular prism, and the second guide component includes three second guide ribs, which are respectively arranged at three corners of the triangular prism-shaped injection cap.

[0024] Preferably, the second fastening structure includes a flange arranged at the opening portion of the injection cap and extending along the axial direction of the injection cap, the first fastening structure includes a recess arranged on the base of the injection head and capable of cooperating with the flange, a first clip is provided on the flange, and a second clip is provided in the recess, and the first clip is constructed to be able to be engaged with the second clip in the installed state.

[0025] Preferably, the injection cap is provided with two flanges symmetrically arranged with respect to the axial center line of the injection cap, and the injection head is provided with two recesses symmetrically arranged with respect to the axial center line of the injection head.

[0026] Preferably, the first fastening structure includes a circle of snap-fit ​​flanges arranged at the injection end of the injection head, and the second fastening structure includes a plurality of snap-fit ​​portions arranged at the bottom of the injection cap opposite to the opening portion, and the snap-fit ​​flange is constructed to be able to be snapped to the plurality of snap-fit ​​portions.

[0027] Preferably, three snap-fit ​​portions are provided at the bottom of the injection cap, wherein one snap-fit ​​portion is provided between every two adjacent second guide ribs.

[0028] Preferably, a plurality of hollow portions are provided at one end of the base opposite to the injection body.

[0029] According to another aspect of the present invention, there is further provided an injection system, comprising:

[0030] The injection head assembly as described above, wherein a piston is provided in the injection head; and

[0031] An injection device includes a housing and a push rod arranged inside the housing, the push rod is movably arranged in the housing, the base of the injection head can be engaged in the housing, and the push rod is constructed to be able to engage with the piston to drive the piston to move in the injection chamber.

[0032] According to the injection head assembly and injection system of the present invention, a first guide component is provided on the outer surface of the injection body of the injection head, and a second guide component is provided on the inner surface of the injection cap. Through the cooperation of the first guide component and the second guide component, the injection cap can be conveniently and quickly guided to be mounted on the injection body in a predetermined orientation, thereby facilitating the connection of the injection cap to the injection head. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] 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 accompanying drawings refer to the same or similar components. Those skilled in the art should understand that the accompanying drawings are intended to schematically illustrate preferred embodiments of the present invention and have no limiting effect on the scope of the present invention. The components in the drawings are not drawn to scale.

[0034] Figure 1 is a perspective schematic diagram of an injection head of an injection head assembly according to a first preferred embodiment of the present invention;

[0035] Figure 2 for Figure 1 A perspective schematic diagram of the injection head shown from another angle;

[0036] Figure 3 is a schematic perspective view of an injection cap of an injection head assembly according to a first preferred embodiment of the present invention;

[0037] Figure 4 for Figure 3 Another perspective schematic diagram of the injection cap shown;

[0038] Figure 5 is a perspective schematic diagram of the injection cap when viewed from the opening of the injection cap;

[0039] Figure 6 is a perspective schematic diagram of the injection cap when viewed from the bottom of the injection cap;

[0040] Figure 7 is a schematic cross-sectional view of the injection head assembly in an installed state, wherein the injection cap is mounted on the injection body in a predetermined orientation;

[0041] Figure 8 is a perspective schematic diagram of an injection cap of an injection head assembly according to a second preferred embodiment of the present invention;

[0042] Figure 9 for Figure 8 A perspective schematic diagram of another angle of the injection cap shown in ;

[0043] Figure 10 is a perspective schematic diagram of an injection head of an injection head assembly according to a second preferred embodiment of the present invention;

[0044] Figure 11 for Figure 10 A perspective schematic diagram of the injection head shown from another angle;

[0045] Figure 12 is a schematic cross-sectional view of an injection head assembly according to a second preferred embodiment of the present invention in an installed state, wherein the injection cap is sleeved on the injection body in a predetermined orientation;

[0046] Figure 13 for Figure 10 A perspective schematic diagram of the injection head shown from another angle;

[0047] Figure 14 It is a perspective schematic diagram of an injection system according to a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0048] Below, the injection head assembly and injection system according to the preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. The following are merely preferred embodiments of the present invention. Those skilled in the art may conceive of other ways to implement the present invention based on the preferred embodiments, and such other ways also fall within the scope of the present invention.

[0049] The present invention provides an injection head assembly and an injection system including the injection head 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 7 XX direction or parallel to the attached Figure 7 The direction of the XX direction in the present invention; the "radial direction", "radial direction", "circumferential direction", "circumferential direction" and so on 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".

[0050] Figures 1-14 The present invention illustrates an injection head assembly and an injection system including the same according to some preferred embodiments of the present invention. The injection head assembly of the present invention allows for the convenient and quick placement of an injection cap on an injection body in a predetermined orientation, thereby facilitating secure connection of the injection cap to the injection head. The injection system of the present invention is capable of drawing the liquid to be injected into the injection chamber within the injection body and completing the injection, and can employ needle-free injection methods.

[0051] Implementation Method 1

[0052] References below Figure 1-Figure 7 An injection head assembly according to a first preferred embodiment of the present invention is described in detail.

[0053] like Figure 1-Figure 7 As shown, the injection head assembly 100 generally includes an injection head 110 and an injection cap 120. The injection cap 120 can be sleeved on the injection head 110. Figure 1 and Figure 2 As shown, the injection head 110 is generally cylindrical and includes a base 111 and an injection body 112 formed on the base 111. The base 111 can be connected to an injection device 150 (described later). The injection body 112 has an injection cavity inside. The injection body 112 has a connection end and an injection end opposite to the connection end. The connection end is used to connect to the base 111, and the injection end is provided with an injection micropore 113 that connects the injection cavity to the outside.

[0054] The injection head assembly 100 further includes a piston (not shown) that is movably disposed within the injection chamber. To perform an injection, the injection body 112 can be pressed against the site to be injected, such as the patient's skin. When the injection process (described below) is triggered, the liquid in the injection chamber is pushed by the piston and injected into the patient through the injection micropore 113.

[0055] like Figure 3-Figure 5 As shown, the injection cap 120 has an opening 121, and the injection cap 120 is configured to be sleeved on the injection body 112 through the opening 121. In order to facilitate the gripping of the injection cap 120 for operations such as installation and removal, the injection cap 120 preferably has a non-circular cross section. Figure 6 As shown, in a preferred embodiment, the injection cap 120 includes a first side surface 120a, a second side surface 120b, a third side surface 120c, and a fourth side surface 120d connected to each other. The first side surface 120a is arranged opposite the second side surface 120b, and the third side surface 120c is arranged opposite the fourth side surface 120d. The outer surfaces of the first side surface 120a and the second side surface 120b are substantially flat, and the outer surfaces of the third side surface 120c and the fourth side surface 120d are configured as arcuate surfaces.

[0056] In order to facilitate the installation of the injection cap 120 to the injection head 110 in a predetermined orientation, as shown in FIG. Figure 1 and Figure 2 As shown, a first guide member 114 is provided on the outer surface of the injection body 112. Figure 4 and Figure 5 As shown, a second guide member 122 is provided on the inner surface of the injection cap 120. The first guide member 114 and the second guide member 122 are configured to cooperate with each other when the injection cap 120 is mounted on the injection head 110 to guide the injection cap 120 to be mounted on the injection body 112 in a predetermined orientation.

[0057] In a preferred embodiment, a first fastening structure 115 is provided on the injection head 110, and a second fastening structure 123 is provided on the injection cap 120. When the injection cap 120 is installed on the injection body 112 in a predetermined orientation, the first fastening structure 115 can be connected to the second fastening structure 123.

[0058] like Figures 1-4 as well as Figure 7As shown, in a preferred embodiment, the first fastening structure 115 includes a recess 115a provided on the base 111 of the injection head 110, with a second latch 115b disposed in the recess 115a. The second fastening structure 123 includes a flange 123a provided at the opening 121 of the injection cap 120 and extending in the axial direction of the injection cap 120, with a first latch 123b disposed on the flange 123a. When the injection cap 120 is mounted on the injection head 110, the flange 123a extends into the recess 115a, and the first latch 123b engages with the second latch 115b, thereby limiting displacement of the injection cap 120 in the circumferential and axial directions relative to the injection head 110, thereby preventing the injection cap 120 from falling off the injection head 110. Further preferably, the injection cap 120 is provided with two flanges 123 a symmetrically arranged with respect to the axial center line XX of the injection cap 120 , and the injection head 110 is provided with two recesses 115 a symmetrically arranged with respect to the axial center line XX of the injection head 110 .

[0059] The guide structure according to a preferred embodiment of the present invention will be described in detail below.

[0060] like Figure 1-Figure 5 As shown, the first guide member 114 includes a plurality of first guide ribs 116 spaced apart around the outer circumference of the injection body 112, and the second guide member 122 includes a plurality of second guide ribs 124 spaced apart around the inner circumference of the injection cap 120. In the illustrated embodiment, there are two first guide ribs 116 and two second guide ribs 124. It will be appreciated that other embodiments (not shown) may also include other numbers of first guide ribs 116 and second guide ribs 124. Preferably, when the injection cap 120 is mounted on the injection body 112 in a predetermined orientation, the projections of the two first guide ribs 116 on a horizontal plane perpendicular to the axial centerline of the injection body 112 are offset from the projections of the two second guide ribs 124 on the same horizontal plane. In other words, in the installed state, the projections of the two first guide ribs 116 on a horizontal plane perpendicular to the axial centerline of the injection body 112 do not overlap with the projections of the two second guide ribs 124 on the same horizontal plane. On the one hand, this solution can ensure that when the injection cap 120 is covered on the injection head 110, the two second guide ribs 124 can smoothly enter the space between the two first guide ribs 116 respectively; on the other hand, it can ensure that the first guide rib 116 and the second guide rib 124 cooperate with and limit each other in the circumferential direction of the injection head.

[0061] Preferably, two first guide ribs 116 are arranged on the outer circumference of the injection body 112 in the same structure and orientation and are evenly spaced around the circumference of the injection body 112. Each first guide rib 116 protrudes from the outer surface of the injection body 112 and has a shape that extends along the circumference of the injection body 112. The first guide rib 116 has a first guide surface 116a facing the injection end. The first guide surface 116a has a first end 116b and a second end 116c, with the first end 116b being closer to the injection end than the second end 116c. In the preferred embodiment shown in the figure, the first guide surface 116a is configured so that the first end 116b is located downstream of the second end 116c when viewed clockwise from the injection end of the injection body 112.

[0062] Two second guide ribs 124 are arranged on the inner circumference of the inject cap 120 in the same structure and orientation. The second guide ribs 124 protrude from the inner surface of the inject cap 120 and have a shape that extends along the inner circumference of the inject cap 120. The second guide rib 124 has a second guide surface 124a facing the opening 121. The second guide surface 124a has a third end 124b and a fourth end 124c. The third end 124b is closer to the opening 121 than the fourth end 124c. The second guide surface 124a is configured such that the third end 124b is located upstream of the fourth end 124c when viewed clockwise from the opening 121 of the inject cap 120.

[0063] By providing two inclined first guide ribs 116 on the outer periphery of the injection body 112 and two matching second guide ribs 124 on the inner periphery of the injection cap 120, it is possible to achieve that when the injection cap 120 is placed at any angle or orientation relative to the circumference of the injection head 110, the two first guide ribs 116 on the outer periphery of the injection body 112 and the two second guide ribs 124 on the inner periphery of the injection cap 120 can guide each other in both clockwise and counterclockwise directions, thereby guiding the two second guide ribs 124 respectively into the space between the two first guide ribs 116, thereby allowing the injection cap 120 to be smoothly placed on the injection head 110 in a predetermined orientation. According to the injection head assembly 100 of this embodiment, the injection cap 120 or the injection head 110 can achieve a maximum guide angle of approximately 90° during assembly.

[0064] It will be understood that in other embodiments not shown, the first guide surface 116a may also be constructed such that when viewed in a clockwise direction from the injection end of the injection body 112, the first end 116b is located upstream of the second end 116c, and the second guide surface 124a is constructed such that when viewed in a clockwise direction from the opening portion 121 of the injection cap 120, the third end 124b is located downstream of the fourth end 124c.

[0065] Preferably, the radial distance between the radial inner sides of the two second guide ribs 124 is smaller than the radial distance between the radial outer sides of the two first guide ribs 116. This solution can prevent the two first guide ribs 116 from entering the injection cap 120 from the positions corresponding to the two second guide ribs 124, or the two second guide ribs 124 from being covered from the positions corresponding to the two first guide ribs 116. Instead, they must enter from the space between the two first guide ribs 116 or the two second guide ribs 124 under the guidance of the first guide ribs 116 or the second guide ribs 124, so that the injection cap 120 can only be installed in a predetermined orientation.

[0066] like Figure 4 、 Figure 5 and Figure 7 As shown, the second guide rib 124 extends along the axial direction of the injection cap 120 to the bottom of the injection cap 120. Preferably, a rib 125 extending along the axial direction is provided radially inwardly of the second guide rib 124. More preferably, a plurality of ribs 125 are provided radially inwardly of the second guide rib 124. The plurality of ribs 125 are arranged at intervals along the circumference of the injection cap 120. When the injection cap 120 is mounted on the injection head 110, the ribs 125 are configured to abut against the outer circumference of the injection body 112, thereby allowing the injection body 112 to be contained within the area enclosed by the plurality of ribs 125. This arrangement prevents the position of the injection body 112 from shifting, ensuring that the injection body 112 remains properly positioned. In the illustrated embodiment, two ribs 125 extending along the axial direction are provided radially inwardly of each second guide rib 124, one on each side of the second guide rib 124. It can be understood that in other embodiments not shown, other numbers of ribs 125 can be provided on the radial inner side of the second guide rib 124 .

[0067] Implementation Method 2

[0068] References below Figures 8-14 An injection head assembly 200 according to a second preferred embodiment of the present invention will be described in detail.

[0069] like Figures 8-13 As shown, similar to the injection head assembly 100 according to embodiment 1, in this embodiment, the injection head assembly 200 generally includes an injection head 210 and an injection cap 220, and the injection cap 220 can be sleeved on the injection head 210. Figure 10 and Figure 11As shown, the injection head 210 is generally cylindrical and includes a base 211 and an injection body 212 formed on the base 211. The base 211 can be connected to the injection device 150 (described later). The injection body 212 has an injection cavity inside. The injection body 212 has a connection end and an injection end opposite to the connection end. The connection end is used to connect to the base 211, and the injection end is provided with an injection micropore 213 that connects the injection cavity to the outside.

[0070] The injection head assembly 200 further includes a piston (not shown) that is movably disposed within the injection chamber. To perform an injection, the injection body 212 can be pressed against the site to be injected, such as the patient's skin. When the injection process (described below) is triggered, the liquid in the injection chamber is pushed by the piston and injected into the patient through the injection micropore 213.

[0071] like Figure 8-Figure 9 As shown, the injection cap 220 has an opening 221, and the injection cap 220 is configured to be sleeved on the injection body 212 through the opening 221. In order to facilitate holding the injection cap 220 to perform operations such as installation and removal, the injection cap 220 is preferably configured roughly in the shape of a triangular prism.

[0072] In order to facilitate the installation of the injection cap 220 to the injection head 210 in a predetermined orientation, as shown in FIG. Figure 10 and Figure 11 As shown, a first guide member 214 is provided on the outer surface of the injection body 212. Figure 8 and Figure 9 As shown, a second guide member 222 is provided on the inner surface of the injection cap 220. The first guide member 214 and the second guide member 222 are configured to cooperate with each other when the injection cap 220 is mounted on the injection head 210 to guide the injection cap 220 to be mounted on the injection body 212 in a predetermined orientation.

[0073] In a preferred embodiment, a first fastening structure 215 is provided on the injection head 210, and a second fastening structure 223 is provided on the injection cap 220. When the injection cap 220 is installed on the injection body 212 in a predetermined orientation, the first fastening structure 215 can be connected to the second fastening structure 223.

[0074] like Figures 9-12As shown, the first fastening structure 215 includes a ring of snap-fitting flanges 215a provided at the injection end of the injection head 210, and the second fastening structure 223 includes multiple snap-fitting portions 223b provided at the bottom of the injection cap 220, opposite the opening 221. When the injection cap 220 is mounted on the injection head 210, the snap-fitting flange 215a can snap into the multiple snap-fitting portions 223b to prevent the injection cap 220 from falling off the injection head 210. Preferably, three snap-fitting portions 223b are provided at the bottom of the injection cap 220, which ensures a secure connection between the injection cap 220 and the injection head 210.

[0075] The guide structure according to this preferred embodiment will be described in detail below.

[0076] like Figures 8-11 As shown, the first guide component 214 includes a plurality of first guide ribs 216 spaced apart around the outer circumference of the injection body 212, and the second guide component 222 includes a plurality of second guide ribs 224 spaced apart around the inner circumference of the injection cap 220. In the illustrated embodiment, there are two first guide ribs 216 and three second guide ribs 224. It is understood that other embodiments (not shown) may also include other numbers of first guide ribs 216 and second guide ribs 224. Preferably, when the injection cap 220 is mounted on the injection body 212 in a predetermined orientation, the projections of the first guide ribs 216 and the projections of the second guide ribs 224 on a horizontal plane perpendicular to the axial centerline of the injection body 212 are offset from each other. In other words, when installed, the projections of the two first guide ribs 216 and the projections of the three second guide ribs 224 on the horizontal plane perpendicular to the axial centerline of the injection body 212 do not overlap. On the one hand, this solution can ensure that when the injection cap 220 is covered on the injection head 210, the three second guide ribs 224 can respectively and smoothly enter the space between the two first guide ribs 216. On the other hand, it can facilitate the first guide rib 216 and the second guide rib 224 to cooperate with each other in the circumferential direction of the injection head assembly, thereby realizing the limitation of the injection head 210 and the injection cap 220 in the circumferential direction.

[0077] Preferably, two first guide ribs 216 are arranged on the periphery of the injection body 212 with identical structures and orientations and are evenly spaced around the periphery of the injection body 212. Each first guide rib 216 protrudes from the outer surface of the injection body 212 and has a shape that extends along the periphery of the injection body 212. The first guide rib 216 has a first guide surface 216a facing the injection end. The first guide surface 216a has a first end 216b and a second end 216c, with the first end 216b being closer to the injection end than the second end 216c. In other preferred embodiments, the first guide surface 216a can also be arranged so that the second end 216c is closer to the injection end than the first end 216b.

[0078] The second guide component 122 includes three second guide ribs 224, which are evenly spaced around the inner circumference of the injection cap 220. Preferably, the three second guide ribs 224 are disposed at the three corners of the triangular prism-shaped injection cap 220. Each second guide rib 224 protrudes from the inner surface of the injection cap 220 and extends from the opening 221 of the injection cap 220 along the axial direction of the injection cap 220 to the bottom of the injection cap 220. In a preferred embodiment, a snap-fit ​​portion 223b is disposed between every two adjacent second guide ribs 224. In other words, the three snap-fit ​​portions 223b and the three second guide ribs 224 are alternately arranged circumferentially of the injection head assembly 200.

[0079] Preferably, the three second guide ribs 224 have identical structures. Each second guide rib 224 has a beveled guide surface 224a at its end near the opening 221. This beveled guide surface 224a mates with the first guide surface 216a of the first guide rib 216 to ensure that when the injection cap 220 is attached to the injection head 210 at any angle or orientation relative to the circumference, the three second guide ribs 224 are guided into the space between the two first guide ribs 216, thereby allowing the injection cap 220 to be smoothly attached to the injection head 210 in a predetermined orientation. The injection head assembly 200 according to this embodiment can achieve a maximum guide angle of approximately 60° during assembly of the injection cap 220 or injection head 210. Preferably, when the injection cap 220 is attached to the injection head 210, the two first guide ribs 216 can abut against the adjacent second guide rib 224 in the circumferential direction, thereby limiting the position of the injection cap 220 in the circumferential direction.

[0080] Preferably, the distance between the radially inner side of the second guide rib 224 and the predetermined inner surface of the injection cap 220 is less than the distance between the radially outer sides of the two first guide ribs 216, wherein the predetermined inner surface refers to the inner surface of the injection cap 220 that is opposite the radially inner side of the second guide rib 224 with respect to the axial centerline of the injection cap 220. This solution prevents the two first guide ribs 216 from entering the injection cap 220 from between the radially inner side of the second guide rib 224 and the predetermined inner surface of the injection cap 220. Instead, the two first guide ribs 216 must enter from the space between the two second guide ribs 224, guided by the first guide rib 216 or the second guide rib 224, so that the injection cap 220 can only be assembled according to the predetermined orientation.

[0081] like Figure 13 As shown, in a preferred embodiment, a plurality of hollow portions 211a are provided at one end of the base 211 opposite to the injection body 212, and the plurality of hollow portions 211a are evenly spaced in the circumferential direction of the injection head 210. This solution can reduce the weight of the injection head 210.

[0082] The injection head assembly 100 or the injection head assembly 200 according to the above embodiment can be used in conjunction with the injection device 150 to perform drug inhalation or injection operations. Figure 14 As shown, the injection head assembly 100 and the injection device 150 together constitute an injection system 160 according to a preferred embodiment of the present invention. In a preferred embodiment, as shown in FIG. Figure 14 As shown, the injection device includes a housing 151 and a push rod (not shown) disposed inside the housing 151, and the push rod can be pushed to move relative to the housing 151. The base of the injection head can be engaged in the housing 151, and the push rod can be engaged with the piston to move the piston in a direction away from the injection micropore during a drug aspiration operation, or to push the piston in a direction toward the injection micropore during an injection operation.

[0083] It should be noted that while the concepts of the present disclosure are described herein using injectables such as pharmaceuticals and liquid medicines as examples, this is for illustrative purposes only and is not intended to be limiting. The injectables may be of various other types, such as saline solution and glucose, as long as they can be injected into the human body using the needle-free injector of the present disclosure, they fall within the scope of protection of the present disclosure.

[0084] The mating features such as protrusions, grooves, flanges, snaps, etc. in each mating structure group provided in the above embodiments can be structures that extend and are intermittently arranged in the circumferential direction, or can be structures that are continuously arranged in the circumferential direction. The injection system can make some structural adjustments accordingly.

[0085] The above description of various embodiments of the present invention is provided for the purpose of description to one 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, 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 head assembly, characterized in that: The injection head assembly comprises: An injection head, the injection head comprising a base and an injection body, an injection cavity is formed inside the injection body, the injection body has a connecting end and an injection end opposite to the connecting end, the connecting end is connected to the base, and the injection end is provided with an injection microhole; and An injection cap, wherein the injection cap has an opening portion, and the injection cap is configured to be sleeved on the injection body through the opening portion, A first guide component is provided on the outer surface of the injection body, and a second guide component is provided on the inner surface of the injection cap. The first guide component and the second guide component are constructed to cooperate with each other when the injection cap is installed on the injection head to guide the injection cap to be mounted on the injection body in a predetermined orientation.

2. The injection head assembly according to claim 1, characterized in that: The injection head is provided with a first fastening structure, and the injection cap is provided with a second fastening structure. When the injection cap is mounted on the injection body according to the predetermined orientation, the first fastening structure is connected to the second fastening structure.

3. The injection head assembly according to claim 2, characterized in that: The first guide component includes a plurality of first guide ribs arranged at intervals around the outer circumference of the injection body, and the second guide component includes a plurality of second guide ribs arranged at intervals around the inner circumference of the injection cap, wherein in the installed state, the projections of the plurality of first guide ribs on a horizontal plane perpendicular to the axial center line of the injection head and the projections of the plurality of second guide ribs on the horizontal plane are staggered with each other.

4. The injection head assembly according to claim 3, characterized in that: The first guide component includes two first guide ribs, which are arranged on the outer surface of the injection body in the same orientation and are evenly spaced around the circumference of the injection body. The first guide ribs protrude from the outer surface of the injection body and have a shape extending along the circumference of the injection body.

5. The injection head assembly according to claim 4, characterized in that: The first guide rib has a first guide surface facing the injection end, the first guide surface has a first end and a second end, and the first end is closer to the injection end than the second end.

6. The injection head assembly according to claim 5, characterized in that: The second guide component includes two second guide ribs, which are arranged on the inner surface of the injection cap in the same orientation and are evenly spaced around the inner circumference of the injection cap, and the second guide ribs protrude from the inner surface of the injection cap and have a shape extending along the inner circumference of the injection cap.

7. The injection head assembly according to claim 6, characterized in that: The radial distance between the radial inner sides of the two second guide ribs is smaller than the radial distance between the radial outer sides of the two first guide ribs.

8. The injection head assembly according to claim 6, characterized in that: The second guide rib has a second guide surface facing the opening, the second guide surface has a third end and a fourth end, and the third end is closer to the opening than the fourth end.

9. The injection head assembly according to claim 8, characterized in that: The first guide surface is configured such that when viewed in a clockwise direction from the injection end of the injection body, the first end is located downstream of the second end, and the second guide surface is configured such that when viewed in a clockwise direction from the opening of the injection cap, the third end is located upstream of the fourth end, or the first guide surface is configured such that when viewed in a clockwise direction from the injection end of the injection body, the first end is located upstream of the second end, and the second guide surface is configured such that when viewed in a clockwise direction from the opening of the injection cap, the third end is located downstream of the fourth end.

10. The injection head assembly according to claim 6, characterized in that: The second guide rib extends along the axial direction of the injection cap to the bottom of the injection cap opposite to the opening, and a rib extending along the axial direction is further provided on the radial inner side of the second guide rib.

11. The injection head assembly according to claim 10, characterized in that: A plurality of ribs are disposed radially inwardly of the second guide rib, the plurality of ribs are spaced apart in the circumferential direction of the injection cap, and the plurality of ribs are configured to abut against the outer circumference of the injection body in the installed state.

12. The injection head assembly according to claim 6, characterized in that: The cross section of the injection cap is configured in a non-circular shape.

13. The injection head assembly according to claim 12, characterized in that: The injection cap includes a first side surface, a second side surface, a third side surface and a fourth side surface connected to each other, the first side surface is arranged opposite to the second side surface, the third side surface is arranged opposite to the fourth side surface, the outer surfaces of the first side surface and the second side surface are roughly configured as planes, and the outer surfaces of the third side surface and the fourth side surface are configured as arcuate surfaces.

14. The injection head assembly according to claim 5, characterized in that: The second guide component includes a plurality of second guide ribs, which are evenly spaced around the inner circumference of the injection cap, and the second guide ribs protrude from the inner surface of the injection cap and extend from the opening of the injection cap along the axial direction of the injection cap to the bottom of the injection cap.

15. The injection head assembly according to claim 14, characterized in that An end portion of the second guide rib close to the opening has a guide slope.

16. The injection head assembly according to claim 15, characterized in that The distance between the radial inner side of the second guide rib and the predetermined inner surface of the injection cap is smaller than the distance between the radial outer sides of the two first guide ribs, and the predetermined inner surface is the inner surface of the injection cap opposite to the radial inner side with respect to the axial center line of the injection cap.

17. The injection head assembly according to claim 16, characterized in that The injection cap is substantially configured in the shape of a triangular prism, and the second guide component includes three second guide ribs, which are respectively arranged at three corners of the injection cap in the shape of a triangular prism.

18. The injection head assembly according to any one of claims 6 to 13, characterized in that: The second fastening structure includes a flange arranged at the opening portion of the injection cap and extending along the axial direction of the injection cap, the first fastening structure includes a recessed portion arranged on the base of the injection head and capable of cooperating with the flange, a first buckle is arranged on the flange, and a second buckle is arranged in the recess, and the first buckle is constructed to be able to be engaged with the second buckle in the installed state.

19. The injection head assembly according to claim 18, characterized in that The injection cap is provided with two flanges symmetrically arranged with respect to the axial center line of the injection cap, and the injection head is provided with two recesses symmetrically arranged with respect to the axial center line of the injection head.

20. The injection head assembly according to any one of claims 14 to 17, characterized in that: The first fastening structure includes a circle of snap-fit ​​flanges arranged at the injection end of the injection head, and the second fastening structure includes a plurality of snap-fit ​​parts arranged at the bottom of the injection cap opposite to the opening part, and the snap-fit ​​flange is constructed to be snap-fitted to the plurality of snap-fit ​​parts.

21. The injection head assembly according to claim 20, characterized in that The bottom of the injection cap is provided with three buckle parts, wherein one buckle part is provided between every two adjacent second guide ribs.

22. The injection head assembly according to claim 1, characterized in that A plurality of hollow parts are arranged at one end of the base opposite to the injection body.

23. An injection system, characterized in that: The injection system comprises: The injection head assembly according to any one of claims 1 to 22, wherein a piston is provided in the injection head; and An injection device comprises a shell and a push rod arranged inside the shell, wherein the push rod is movably arranged in the shell, the base of the injection head can be engaged in the shell, and the push rod is constructed to be able to engage with the piston to drive the piston to move in the injection chamber.

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