Injection head and injection system

Abstract

The invention provides an injection head and an injection system. The injection head comprises an injection head body, a piston and a stop device. The injection head main body is provided with an open end and an injection end opposite to the open end, the open end is provided with a first opening, the injection end is provided with an injection micropore, and an injection cavity communicated with the first opening and the injection micropore is arranged in the injection head main body. The piston can be inserted into the injection cavity through the first opening and can move in the injection cavity, the piston comprises a piston rod and a piston head connected with the piston rod, and a stop structure is arranged at the end, close to the piston head, of the piston rod. The stopping device is arranged at the opening end of the injection head main body, and the stopping device is configured to be capable of being matched with the stopping structure so as to prevent the piston from being pulled out of the injection cavity. According to the scheme, the stopping device is arranged to be matched with the stopping structure on the piston, the piston can be prevented from being pulled out of the injection cavity in the pulling process to cause leakage of liquid medicine, and the scheme is easy to operate and low in cost.

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 and an injection system. Background Art

[0002] Existing injection devices are usually provided with a piston, which can reciprocate in the injection chamber when pulled or pushed to extract and inject the liquid medicine. However, in actual operation, when the piston is pulled, it is often easy to cause the piston to be pulled out of the injection device, thereby causing the liquid medicine in the injection device to spill, causing unnecessary waste or polluting the environment.

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

[0005] An injection head body, the injection head body having an open end and an injection end opposite to the open end, the open end having a first opening, the injection end being provided with an injection micro-hole, and the injection head body being provided with an injection cavity communicating with the first opening and the injection micro-hole;

[0006] a piston, wherein the piston is configured to be inserted into the injection cavity through the first opening and is configured to be movable in the injection cavity, the piston comprising a piston rod and a piston head connected to the piston rod, and a stop structure is provided at one end of the piston rod close to the piston head; and

[0007] A stop device is arranged at the open end of the injection head body, and the stop device is constructed to be able to cooperate with the stop structure to prevent the piston from being pulled out of the injection chamber.

[0008] Preferably, the stop means is at least partially arranged around the periphery of the open end.

[0009] Preferably, the stop device includes a surrounding portion and an extension rib arranged at one end of the surrounding portion and extending inwardly along the radial direction of the surrounding portion, and the open end has a circle of flange portions protruding outwardly along the radial direction. When the stop device is assembled to the injection head body, the surrounding portion is arranged around the outer periphery of the flange portion, and the extension rib is clamped below the flange portion.

[0010] Preferably, the stop device further comprises a stop portion, which is connected to the enclosure portion at the other end of the enclosure portion, and in the assembled state, the stop portion partially covers the first opening, and the stop portion is constructed to be able to cooperate with the stop structure.

[0011] Preferably, the stopper has a second opening, the piston rod includes a piston rod body, and at least a portion of the second opening has a shape that matches the outer circumference of the piston rod body.

[0012] Preferably, the stop portion further includes a stop plate, the second opening is surrounded by the stop plate, the stop structure includes a boss portion protruding outward relative to the piston rod body, and the boss portion is constructed to abut against the stop plate when the piston is pulled outward.

[0013] Preferably, the stop plate includes a first stop plate and a second stop plate disposed on both sides of the second opening, and the boss portion includes a first boss and a second boss disposed on both sides of the piston rod body.

[0014] Preferably, the cross section of the piston rod body is substantially square.

[0015] Preferably, the stop device is detachably mounted on the open end of the injection head body.

[0016] Preferably, the second opening has an introduction port provided on an outer periphery of the stopper portion, the introduction port being communicated with the second opening, and the piston rod body is configured to be able to enter the second opening via the introduction port.

[0017] Preferably, the enclosure portion has a first notch in the circumferential direction of the stop device, and a circumferential dimension of the first notch is greater than a circumferential dimension of the introduction port.

[0018] Preferably, an axial distance between the stop plate and the extension rib is substantially equal to an axial thickness of the flange portion.

[0019] Preferably, the first boss and the second boss each include two spaced-apart bosses.

[0020] Preferably, the extension rib has a second notch in the circumferential direction of the stop device, and the circumferential dimension of the second notch is smaller than the circumferential dimension of the first notch and larger than the circumferential dimension of the introduction port.

[0021] Preferably, both ends of the extension rib in the circumferential direction are respectively provided with guiding inclined surfaces.

[0022] Preferably, the injection head body has a main body portion disposed between the opening end and the injection end, and a cross-section of an outer periphery of the main body portion is substantially configured in a triangular shape.

[0023] Preferably, the injection head body further comprises a base arranged at the open end, the base is arranged at a side of the flange portion close to the injection end, and an outer surface of the base is provided with an external threaded portion.

[0024] Preferably, an axial distance between an upper surface of the base and a lower surface of the flange portion is substantially equal to an axial thickness of the extension rib.

[0025] According to a second aspect of the present invention, there is also provided an injection system, the injection system comprising:

[0026] The injection head as described above, wherein the injection head body comprises a base disposed at the open end, and an outer surface of the base is provided with an external threaded portion; and

[0027] An injection device, comprising a housing and a push rod disposed inside the housing, wherein the push rod is movably disposed in the housing, an internal threaded portion is disposed inside the housing, and a portion of the injection head body can be engaged in the housing,

[0028] Wherein, when a part of the injection head body is engaged in the housing, the external threaded portion is engaged with the internal threaded portion, and the push rod is engaged with the piston to drive the piston to move in the injection chamber.

[0029] According to the injection head and injection system of the present invention, by providing a stop device, which cooperates with the stop structure on the piston rod, it can effectively prevent the piston from being pulled out of the injection cavity during the pulling process, thereby effectively preventing the liquid medicine in the injection cavity from leaking and causing waste or polluting the environment. The above solution has a relatively simple structure and is easy to implement and operate, which can effectively reduce costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] 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.

[0031] Figure 1 is a three-dimensional schematic diagram of an injection head according to a preferred embodiment of the present invention;

[0032] Figure 2 for Figure 1A three-dimensional schematic diagram of the injection head body of the injection head shown in FIG.

[0033] Figure 3 for Figure 1 A perspective schematic diagram of the piston of the injection head shown in ;

[0034] Figure 4 for Figure 1 A three-dimensional schematic diagram of an injection head body of an injection head and a stopper device assembled on the injection head body;

[0035] Figure 5 for Figure 1 A three-dimensional schematic diagram of the piston and the stopper of the injection head shown in ;

[0036] Figure 6 for Figure 1 Another perspective schematic diagram of the piston and stopper of the injection head shown in ;

[0037] Figure 7 for Figure 1 A three-dimensional schematic diagram of the stop device of the injection head shown in ;

[0038] Figure 8 It is a schematic three-dimensional diagram of an injection system according to a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0039] Below, the injection head 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 is only the preferred embodiment of the present invention, and those skilled in the art can think of other ways to implement the present invention based on the preferred embodiment, and other ways also fall within the scope of the present invention.

[0040] The present invention provides an injection head and an injection system including the injection head. 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, and the directional terms and positional terms mentioned in the present invention can be understood with reference to the accompanying drawings.

[0041] Figure 1-Figure 8The injection head and the injection system including the injection head according to some preferred embodiments of the present invention are shown. The injection head of the present invention can effectively prevent the piston from being pulled out of the injection chamber during the pulling process by providing a stop device, which cooperates with the stop structure on the piston, thereby effectively avoiding leakage of the liquid in the injection chamber to cause waste or pollution of the environment. The injection system of the present invention can achieve the suction of the liquid to be injected into the injection chamber in the injection head body and complete the injection. The injection system of the present invention can adopt both needle-free injection and needle-injection. Furthermore, the injection system of the present invention can also realize the switching between needle-injection and needle-free injection. For example, by installing an injection needle on the injection micropore of the injection head body, the injection mode of the syringe can be switched from needle-free injection to needle-injection.

[0042] References below Figure 1-Figure 7 An injection head according to a preferred embodiment of the present invention is described in detail.

[0043] like Figure 1-Figure 6 As shown, the injection head 100 generally includes an injection head body 110 and a piston 120. The injection head body 110 is configured to be generally cylindrical, and has an injection cavity inside. The injection head body 110 has an open end 111, an injection end 112 opposite to the open end 111, and a main body portion 113 disposed between the open end 111 and the injection end 112. The injection end 112 is provided with an injection micropore (not shown) that communicates the injection cavity with the outside. The open end 111 has a first opening 114 that communicates with the injection cavity, and the piston 120 can be inserted into the injection cavity via the first opening 114 and can move in the injection cavity. The piston 120 includes a piston head 121 and a piston rod 122 connected to the piston head 121. When an injection operation is intended, the injection end 112 of the injection head body 110 can be pressed against a site to be injected, such as the skin of a patient. When the injection operation (described below) is triggered, the liquid in the injection cavity can be pushed by the piston 120 to be injected into the patient's body via the injection micropore.

[0044] The outer circumference of the main body 113 may be cylindrical or in other shapes. To facilitate the operation of the injection head 110 , preferably, the cross section of the outer circumference of the main body 113 is non-circular, for example, roughly triangular, to facilitate the operation of screwing the injection head 110 .

[0045] like Figure 1-Figure 7 As shown, the injection head 100 further includes a stopper 130, which is disposed at the open end 111 of the injection head body 110. A stopper structure 140 is disposed at one end of the piston rod 122 close to the piston head 121. When the piston 120 moves in the injection cavity, especially when the piston 120 is about to be pulled out of the injection cavity, the stopper 130 can cooperate with the stopper structure 140 to prevent the piston 120 from being pulled out of the injection cavity.

[0046] The specific structures of the stopping device 130 and the stopping structure 140 will be described in detail below.

[0047] like Figure 1 , Figure 4 and Figure 7 As shown, the stopper 130 includes an arc-shaped enclosure 131 and an arc-shaped extension rib 132 arranged at one end of the enclosure 131, and the extension rib 132 extends horizontally and vertically inwardly along the radial direction relative to the enclosure 131. The enclosure 131 can be installed at the opening end 111 of the injection head body 110, and the opening end 111 is provided with a circle of flange portions 111a protruding outwardly along the radial direction thereof. When the stopper 130 is assembled to the injection head body 110, the enclosure 131 is arranged around the outer periphery of the flange portion 111a, and the extension rib 132 is clamped under the flange portion 111a, so that the stopper 130 can be limited in the axial direction and the circumferential direction of the injection head body 110 to prevent the stopper 130 from falling off from the opening end 111. It should be noted that directional terms such as “upper” and “lower” mentioned herein are relative to the vertically placed injection head 100 , wherein the opening end 111 of the injection head body 110 is the upper end and the injection end 112 is the lower end.

[0048] Continue to refer Figure 1 , Figure 4 and Figure 7 The stopper 130 further includes a stopper 133, which is connected to the enclosure 131 at the other end of the enclosure 131 opposite to the extension rib 132. In the assembled state, the stopper 133 partially covers the first opening 114. The stopper 133 can cooperate with the stopper structure 140 on the piston 120, which will be described in detail below. Preferably, the stopper 130 is an integral piece formed in one piece.

[0049] like Figure 4-Figure 6 As shown, the stopper 133 is provided with a second opening 134, which is in communication with the first opening 114 and can allow the piston rod 122 to pass through. The piston rod 122 includes a piston rod body 122a. In a preferred embodiment, the piston rod body 122a has a substantially square cross section, preferably a rectangular cross section.

[0050] Further preferably, at least a portion of the second opening 134 has a shape that matches the outer circumference of the piston rod body 122a. This solution allows the second opening 134 to limit the piston rod body 122a in the circumferential direction, thereby preventing the piston 120 from shifting unexpectedly when moving in the injection cavity.

[0051] like Figure 3-Figure 7As shown, the stopper 133 further includes a stopper plate 135, wherein the stopper plate 135 is arranged around the second opening 134. The stopper structure 140 includes a boss portion 141 protruding outward relative to the piston rod body 122a, and the boss portion 141 can abut against the bottom of the stopper plate 135 when the piston 120 is about to be pulled out of the injection cavity. Preferably, the axial spacing between the stopper plate 135 and the extension rib 132 is substantially equal to the axial thickness of the flange portion 111a, and this solution can prevent the stopper device 130 from moving in the axial direction, thereby ensuring the stability of the stopper device 130. In other embodiments, the axial spacing between the stopper plate 135 and the extension rib 132 can also be slightly greater than the axial thickness of the flange portion 111a.

[0052] Preferably, the stop plate 135 includes a first stop plate 135a and a second stop plate 135b disposed on both sides of the second opening 134. Correspondingly, the boss portion 141 includes a first boss 141a and a second boss 141b disposed on both sides of the piston rod body 122a. When the piston 120 is about to be pulled out of the injection cavity, the first boss 141a can abut against the first stop plate 135a, and the second boss 141b can abut against the second stop plate 135b, so that the piston 120 can be limited at two positions.

[0053] In the illustrated embodiment, Figure 5 As shown, the first boss 141a and the second boss 141b respectively include two spaced-apart bosses. It is understood that in other embodiments not shown, the first boss 141a and the second boss 141b may each include an integral boss.

[0054] like Figure 1 and Figure 2 As shown, the injection head body 110 further includes a base 115 disposed at the open end 111, and the base 115 is disposed below the flange portion 111a, that is, on a side close to the injection end 112. The outer surface of the base 115 is provided with an external threaded portion 116, and the external threaded portion 116 can be used to connect the injection head 100 to an injection device 150 (described below). Preferably, the axial spacing between the upper surface of the base 115 and the lower surface of the flange portion 111a is substantially equal to the axial thickness of the extension rib 132. This solution can further prevent the stopper 130 from moving in the axial direction, thereby ensuring the stability of the stopper 130. In other embodiments, the axial spacing between the upper surface of the base 115 and the lower surface of the flange portion 111a can also be slightly greater than the axial thickness of the extension rib 132.

[0055] In a preferred embodiment, the stopper 130 is detachably mounted on the open end 111 of the injection head body 110, so that the stopper 130 can be easily disassembled and replaced. Figure 5-Figure 7 As shown, the second opening 134 has an inlet 134a arranged on the outer periphery of the stopper 133, and the inlet 134a is connected to the second opening 134. During the assembly process of the stopper device 130, the second opening 134 can be installed to the piston rod body 122a from one side of the piston rod body 122a via the inlet 134a.

[0056] like Figure 7 As shown, the enclosure 131 is provided with a first notch 131a in the circumferential direction of the stopper 130, and the circumferential dimension of the first notch 131a is larger than the circumferential dimension of the introduction port 134a. Correspondingly, the extension rib 132 has a second notch 132a in the circumferential direction of the stopper 130, and the circumferential dimension of the second notch 132a is smaller than the circumferential dimension of the first notch 131a and larger than the circumferential dimension of the introduction port 134a. The positions of the first notch 131a, the second notch 132a and the introduction port 134a correspond in the axial direction of the stopper 130. During the assembly process of the stopper 130, the enclosure 131 and the extension rib 132 can be installed on the opening end 111 of the injection head body 110 from one side of the opening end 111 via the first notch 131a and the second notch 132a.

[0057] In order to facilitate the installation of the stopper 130 to the open end 111, preferably, as Figure 7 As shown, the extension rib 132 is provided with guide slopes 132b at both ends in its circumferential direction. During the installation process, the guide slope 132b can first contact the outer surface of the opening end 111 below the flange portion 111a, thereby facilitating pushing the stop device 130 into the opening end 111 from one side of the opening end 111.

[0058] The injection head 100 according to the above embodiment can be used in conjunction with the injection device 150 to perform drug inhalation or injection operations. Figure 8 As shown, the injection head 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 Figure 8 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 interior of the housing 151 is provided with an internal threaded portion. A portion of the injection head body 110 can be engaged in the housing 151. In the engaged state, the external threaded portion 116 on the base 115 of the injection head body 110 can be threadedly connected with the internal threaded portion of the housing 151, and the push rod can be engaged with the piston 120 to move the piston 120 in a direction away from the injection micropore when performing a drug suction operation, or to push the piston 120 in a direction toward the injection micropore when performing an injection operation.

[0059] It should be noted that the present invention is described herein using medicines, liquid medicines and other injectables as examples, but this is only an example and is not restrictive. The injectables may be of other types, such as saline, glucose, etc. As long as they can be injected into the human body by the needle-free injector of the present invention, they all fall within the protection scope of the present invention.

[0060] The mating features such as protrusions, grooves, flanges, snaps, etc. in each mating structure group provided in the above embodiments may be a structure extending in the circumferential direction and intermittently arranged, or a structure continuously arranged in the circumferential direction, and the injection system may make some structural adjustments accordingly.

[0061] 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.

[0062] 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 head (100), characterized in that: The injection head (100) comprises: An injection head body (110), the injection head body (110) having an open end (111) and an injection end (112) opposite to the open end, the open end (111) having a first opening (114), the injection end (112) being provided with an injection micropore, and an injection cavity communicating with the first opening (114) and the injection micropore being provided inside the injection head body (110); a piston (120), the piston (120) being configured to be inserted into the injection cavity via the first opening (114) and being configured to be movable in the injection cavity, the piston (120) comprising a piston rod (122) and a piston head (121) connected to the piston rod (122), and a stop structure (140) being provided at one end of the piston rod (122) close to the piston head (121); and A stop device (130), wherein the stop device (130) is arranged at the open end (111) of the injection head body (110), and the stop device (130) is constructed to be able to cooperate with the stop structure (140) to prevent the piston (120) from being pulled out of the injection chamber.

2. The injection head (100) according to claim 1, characterized in that: The stop device (130) is at least partially arranged around the outer circumference of the open end (111).

3. The injection head (100) according to claim 1, characterized in that: The stop device (130) includes a surrounding portion (131) and an extension rib (132) arranged at one end of the surrounding portion (131) and extending inwardly along the radial direction of the surrounding portion (131); the opening end (111) has a circle of flange portions (111a) protruding outwardly along the radial direction; when the stop device (130) is assembled to the injection head body (110), the surrounding portion (131) is arranged around the outer periphery of the flange portion (111a), and the extension rib (132) is clamped below the flange portion (111a).

4. The injection head (100) according to claim 3, characterized in that: The stop device (130) further comprises a stop portion (133), wherein the stop portion (133) is connected to the enclosure portion (131) at the other end of the enclosure portion (131), and in the assembled state, the stop portion (133) partially covers the first opening (114), and the stop portion (133) is configured to cooperate with the stop structure (140).

5. The injection head (100) according to claim 4, characterized in that: The stopper (133) has a second opening (134), the piston rod (122) includes a piston rod body (122a), and at least a portion of the second opening (134) has a shape that matches the outer periphery of the piston rod body (122a).

6. The injection head (100) according to claim 5, characterized in that: The stop portion (133) also includes a stop plate (135), and the second opening (134) is surrounded by the stop plate (135). The stop structure (140) includes a boss portion (141) protruding outward relative to the piston rod body (122a), and the boss portion (141) is constructed to be able to abut against the stop plate (135) when the piston (120) is pulled outward.

7. The injection head (100) according to claim 6, characterized in that: The stop plate (135) includes a first stop plate (135a) and a second stop plate (135b) arranged on both sides of the second opening (134), and the boss portion (141) includes a first boss (141a) and a second boss (141b) arranged on both sides of the piston rod body (122a).

8. The injection head (100) according to any one of claims 5 to 7, characterized in that: The cross section of the piston rod body (122a) is approximately square.

9. The injection head (100) according to claim 5, characterized in that: The stopper device (130) is detachably mounted on the opening end (111) of the injection head body (110).

10. The injection head (100) according to claim 9, characterized in that: The second opening (134) has an introduction port (134a) arranged on the outer periphery of the stopper (133), the introduction port (134a) is connected to the second opening (134), and the piston rod body (122a) is constructed to be able to enter the second opening (134) through the introduction port (134a).

11. The injection head (100) according to claim 10, characterized in that: The enclosure portion (131) has a first notch (131a) in the circumferential direction of the stop device (130), and the circumferential dimension of the first notch (131a) is greater than the circumferential dimension of the introduction port (134a).

12. The injection head (100) according to claim 6, characterized in that: The axial distance between the stop plate (135) and the extension rib (132) is substantially equal to the axial thickness of the flange portion (111a).

13. The injection head (100) according to claim 7, characterized in that: The first boss (141a) and the second boss (141b) each include two spaced-apart bosses.

14. The injection head (100) according to claim 11, characterized in that: The extension rib (132) has a second notch (132a) in the circumferential direction of the stop device (130), and the circumferential dimension of the second notch (132a) is smaller than the circumferential dimension of the first notch (131a) and larger than the circumferential dimension of the introduction port (134a).

15. The injection head (100) according to claim 14, characterized in that Both ends of the extension rib (132) in the circumferential direction are respectively provided with guiding inclined surfaces (132b).

16. The injection head (100) according to claim 1, characterized in that: The injection head body (110) has a main body portion (113) disposed between the opening end (111) and the injection end (112), and a cross-section of an outer periphery of the main body portion is substantially configured in a triangular shape.

17. The injection head (100) according to claim 3, characterized in that: The injection head body further comprises a base (115) arranged at the open end (111), the base being arranged at a side of the flange portion (111a) close to the injection end, and an external threaded portion (116) being arranged on an outer surface of the base.

18. The injection head (100) according to claim 17, characterized in that An axial distance between an upper surface of the base (115) and a lower surface of the flange portion (111a) is substantially equal to an axial thickness of the extension rib (132).

19. An injection system (160), characterized in that: The injection system comprises: The injection head (100) according to any one of claims 1 to 18, wherein the injection head body comprises a base (115) arranged at the open end (111), and an outer surface of the base is provided with an external threaded portion (116); and An injection device (150) comprises a housing (151) and a push rod arranged inside the housing, wherein the push rod is movably arranged in the housing, an internal threaded portion is arranged inside the housing, and a part of the injection head body (110) can be engaged in the housing (151). When a portion of the injection head body (110) is engaged in the housing (151), the external threaded portion is engaged with the internal threaded portion, and the push rod is engaged with the piston (120) to drive the piston (120) to move in the injection chamber.

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