CN115957130A

CN115957130A - Medicine taking needle, injection assembly and injection system

Info

Publication number: CN115957130A
Application number: CN202211540639.XA
Authority: CN
Inventors: 张明
Original assignee: Beijing Qs Medical Technology Co ltd
Current assignee: Beijing Qs Medical Technology Co ltd
Priority date: 2022-12-02
Filing date: 2022-12-02
Publication date: 2023-04-14

Abstract

The invention provides a medicine taking needle, an injection assembly and an injection system. Get it filled needle and include the needle bar and set up get it filled route in the needle bar, it has the mouth of getting it filled to get it filled route, it sets up to get it filled the mouth one side of keeping away from the syringe needle of needle bar, wherein, the periphery of needle bar is provided with the edge the outside convex protruding structure of radial direction of needle bar, protruding structure with first projection has on the parallel vertical face of axial direction of needle bar, it is in to get it filled the mouth have the second projection on the vertical face, at least part of second projection is in the axial radiation within range of first projection. According to the scheme, the bulge structure is arranged on the medicine taking needle, so that the deformation quantity of the sealing plug on the medicine storage bottle can be changed when the medicine taking needle punctures the sealing plug on Chu Yaoping, and the sealing plug shrinks along the curved surface of the bulge structure, and the medicine taking effect caused by the blockage of the deformation part of the sealing plug can be avoided.

Description

Medicine taking needle, injection assembly and injection system

Technical Field

The invention relates to the field of medical instruments, in particular to the field of needleless injection. More particularly, the present invention relates to a medication dispensing needle, an injection assembly and an injection system.

Background

It is known to form the closure of a medicament storage vial from a resilient material to facilitate the introduction of a medicament into the chamber by the needle piercing the closure. Because friction exists between the sealing plug and the medicine taking needle, when the medicine taking needle penetrates the sealing plug, the part of the sealing plug, which is contacted with the medicine taking needle, is deformed and protrudes towards the inside of the medicine storage bottle. When the medicine taking port on the medicine taking needle is in a downward position, the convex part on the sealing plug wraps the medicine taking port like volcano, so that the medicine taking passage is blocked by the convex part of the sealing plug, and the medicine in the medicine storage bottle is taken.

Accordingly, there is a need to provide a drug delivery needle, injection assembly and injection system that at least partially address the above-mentioned problems.

Disclosure of Invention

According to a first aspect of the present invention, a medicine taking needle is provided, the medicine taking needle comprises a needle rod and a medicine taking passage arranged in the needle rod, the medicine taking passage is provided with a medicine taking opening, the medicine taking opening is arranged on one side of the needle rod far away from a needle head, wherein the periphery of the needle rod is provided with a convex structure protruding outwards along the radial direction of the needle rod, the convex structure is provided with a first projection on a vertical plane parallel to the axial direction of the needle rod, the medicine taking opening is provided with a second projection on the vertical plane, and at least one part of the second projection is within the axial radiation range of the first projection.

Preferably, the outer surface of the convex structure is configured as a cambered surface.

Preferably, all of the second projection is within the axial radiation range of the first projection.

Preferably, the projection structure is configured substantially in the shape of an arc-shaped handle, and a portion of the projection structure is located radially outside the medicine taking port, and the projection structure is spaced from the outer periphery of the needle shaft to expose the medicine taking port.

Preferably, the raised structures are disposed continuously around the circumferential direction of the needle shaft, or the raised structures are disposed at intervals around the circumferential direction of the needle shaft.

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

Preferably, the length of the air passageway is greater than the length of the access passageway.

According to another aspect of the present invention, there is also provided an injection assembly comprising:

the injection head comprises an injection head main body, wherein an injection cavity is arranged in the injection head main body, and an injection micropore is arranged at the end part of the injection head main body;

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

the needle of any preceding claim, wherein the access is capable of communicating with the injection lumen.

Preferably, the injection assembly further comprises a housing assembly comprising a housing body having an open end into which a drug vial can be passed and an engagement end opposite the open end, the engagement end being engaged with the injector head body, the drug delivery needle being disposed in the housing body.

Preferably, the housing assembly further comprises an elastic gasket, the elastic gasket is arranged in the housing main body and is closer to the injection head main body than the medicine taking needle, and a first through hole communicated with the medicine taking passage is formed in the elastic gasket.

Preferably, at least one blocking rib is provided on an inner side wall of the housing body, the at least one blocking rib being configured to be able to abut against the needle from a side of the needle facing the open end when the needle is placed inside the housing body.

Preferably, a plurality of barrier ribs are provided on an inner sidewall of the case main body, the plurality of barrier ribs being evenly spaced in a circumferential direction of the case main body.

Preferably, the injection micro-hole is provided at a first end of the injector head main body, the first end being coupled to a coupling end of the case main body, the injection micro-hole communicating with the medicine taking passage via the first through-hole.

Preferably, a side of the engagement end facing the injection micro-hole is provided with a first snap-fit portion, and the first end is provided with a ring of snap-fit flanges configured to be snap-fit to the first snap-fit portion.

Preferably, a first positioning opening is formed in the joint end, a positioning flange is arranged on the elastic gasket, a part of the positioning flange extends into the first positioning opening, and the first through hole is formed in the positioning flange.

Preferably, the injection assembly further comprises an operating handle connected to the piston assembly, the operating handle being configured to be operable to move the piston assembly within the injection cavity.

Preferably, the operating handle is configured to be movable relative to the injector head body and to stop moving when moved to a predetermined position.

Preferably, the operating handle is detachably connected to the injector head body.

Preferably, the operating handle comprises a housing portion and a joint portion disposed inside the housing portion, the housing portion is configured to be cylindrical, the joint portion is also configured to be cylindrical and is concentrically disposed with the housing portion, the housing portion is sleeved outside the injector head main body, the injector head main body has an opening portion, and the joint portion extends into the injector head main body through the opening portion and is detachably connected to the piston assembly.

Preferably, the engaging portion is provided with a snap structure, the piston assembly comprises a piston and a base connected with the piston, and the base is provided with a catch structure cooperating with the snap structure.

Preferably, the joint portion includes a support portion configured as a hollow cylinder and a plurality of axially extending rods connected to and extending from the support portion in a direction toward the piston assembly, the plurality of axially extending rods being spaced apart from each other in a circumferential direction of the joint portion, each axially extending rod including the snap structure.

Preferably, the inner periphery of the opening portion is provided with a plurality of protruding portions corresponding to the number and positions of the plurality of axially extending rods, the protruding portions being configured to be able to abut against the axially extending rods on the radially outer side of the axially extending rods when the operating handle drives the piston to move axially.

Preferably, the injection assembly further comprises a limiting structure configured to limit rotation of the operating handle relative to the injector head body in a predetermined state.

Preferably, the syringe head main body is provided with a first flange part near the opening part, one of the first flange part and the housing part is provided with a first protrusion, and the other of the first flange part and the housing part is provided with a first groove matched with the first protrusion, and the first protrusion and the first groove together form a group of the limiting structure.

Preferably, the injection assembly comprises two sets of the limiting structures which are symmetrically arranged relative to the central axis of the injection head main body.

Preferably, the first groove is provided on the first flange portion, the first projection is provided on an inner surface of the housing portion and has a predetermined length in an axial direction of the housing portion, the predetermined length of the first projection is set so that the first projection can be kept engaged in the first groove before the bar handle is moved to the predetermined position, and the first projection is disengaged from the first groove when the bar handle is moved to the predetermined position.

Preferably, the injection assembly further comprises a stop formation configured to limit further axial movement of the operating handle relative to the injector head body when the operating handle is moved to the predetermined position relative to the injector head body.

Preferably, a second protrusion is further provided on the outer shell portion, the syringe head main body further includes a second flange portion spaced apart from the first flange portion in an axial direction of the syringe head main body, a stopper disc extending a predetermined distance in a circumferential direction thereof is provided on the second flange portion, the stopper disc is recessed in a direction toward the opening portion in the axial direction of the second flange portion, the stopper disc is configured to block an axial movement of the second protrusion, and the second protrusion and the second stopper disc together constitute a set of the stopper structure.

Preferably, the injection assembly comprises two sets of said stop formations arranged rotationally symmetrically with respect to a central axis of the injector head body.

Preferably, the second flange portion is further provided with a second groove communicating with the recess of the stopper disc, the position of the second groove corresponding to the position of the first groove, the second groove being configured to be capable of fitting with the first projection.

Preferably, the second projection is configured to be able to mate with the first groove and the second groove.

Preferably, the second projection is spaced from the first projection in both the axial direction and the circumferential direction of the outer shell portion.

Preferably, the shortest axial distance between the first projection and the second projection is substantially equal to the distance between the top surface of the stop disc and the bottom surface of the first flange portion, and/or the circumferential length between the first projection and the second projection is substantially equal to the stop disc circumferential length.

Preferably, the injector head body has a first end at which the injection micro-holes are disposed and a second end opposite to the first end, the second end being closer to the engagement end of the housing body than the first end.

Preferably, the piston assembly comprises a piston and a piston rod, one end of the piston rod is engaged with the piston, a first passage is arranged in the piston, a second passage capable of communicating with the first passage is arranged in the piston rod, and the second passage is communicated with the medicine taking passage through the first through hole.

Preferably, the piston assembly further includes a piston cap connected at an end of the piston rod opposite the piston, the piston cap being connected to the engagement end of the housing body.

Preferably, a second positioning opening is formed in the piston cap, a positioning flange is arranged on the elastic gasket, a part of the positioning flange extends into the second positioning opening, and the first through hole is formed in the positioning flange.

Preferably, the piston cap is in one piece with the piston rod.

Preferably, the piston cap and the housing main body are respectively provided with mutually matched clamping structures.

Preferably, be provided with a plurality of joint openings on the piston cap near periphery department, be provided with in the casing main part with a plurality of joints of a plurality of joint opening complex are buckled, the joint opening with the joint is buckled and is constituted jointly the joint structure.

Preferably, the injection assembly further comprises:

an end cap sleeved on the injector head body from the first end, an elastic sealing member disposed in the end cap, the elastic sealing member being disposed at the first end of the injector head body around the injection micro-hole in a sealing manner, wherein the elastic sealing member has an initial state in which the elastic sealing member is at least partially spaced apart from the first end of the injector head body and a sealing space is formed between the elastic sealing member and the first end of the injector head body, and a deformed state in which the elastic sealing member is configured to be capable of being pressed in a direction toward the injection micro-hole to form a negative pressure in the sealing space.

Preferably, the resilient sealing member comprises a sealing portion configured as a cup-like structure, the sealing portion having a periphery abutting a first end of the injector head body in the initial state of the resilient sealing member.

Preferably, a through hole is provided at an end of the end cap, and the elastic sealing member further includes a joint part connected to the sealing part, the joint part being engaged in the through hole.

Preferably, in the initial state of the elastic seal, a gap is formed between the end of the end cap close to the second end of the injector head body and the injector head body along the axial direction, and the axial distance of the gap is approximately equal to the axial deformation of the elastic seal.

Preferably, a second buckling part is arranged in the end cap close to the elastic sealing part, and the first end of the injector head main body is provided with a circle of clamping flanges which are configured to be clamped to the second buckling part.

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

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

According to a third aspect of the present invention, there is also provided an injection system comprising:

the injection assembly as claimed in any one of the preceding; and

a pushing device comprising a housing and a push rod disposed inside the housing, the push rod being movably disposed in the housing, at least a portion of the injector head body being engageable in the housing, and the push rod being configured to contact or engage the piston assembly to push the piston assembly in a direction toward the injection wells.

According to the medicine taking needle, the injection assembly and the injection system, the bulge structure is arranged on the medicine taking needle, so that when the medicine taking needle punctures the sealing plug on Chu Yaoping, the deformation amount of the sealing plug on the medicine storage bottle can be changed, the sealing plug can be contracted along the curved surface of the bulge structure, and the medicine taking effect caused by the fact that the medicine taking opening is blocked by the deformed part of the sealing plug can be avoided. In addition, the scheme can also realize that the medicine taking opening of the medicine taking passage is arranged to be lower, and more sufficient medicine taking is realized.

Drawings

For a better understanding of the above and other objects, features, advantages and functions of the invention, reference should be made to the preferred embodiments illustrated in the accompanying drawings. The same or similar reference numbers in the drawings refer to the same or similar parts. It will be appreciated by those skilled in the art that the drawings are intended to illustrate preferred embodiments of the invention, without in any way limiting the scope of the invention, and that the various components in the drawings are not to scale.

FIG. 1 is a perspective view of an injection assembly according to a first preferred embodiment of the present invention;

FIG. 2 is an exploded schematic view of the injection assembly of FIG. 1;

FIG. 3 is another perspective view of the injection assembly of FIG. 1, but in a top-down orientation in the drawing view opposite that of FIG. 1;

FIG. 4 is an exploded view of the injection assembly of FIG. 3;

FIG. 5 is a schematic cross-sectional view of the injection assembly shown in FIG. 1, showing a drug vial being placed in the injection assembly;

FIG. 6 is a cross-sectional schematic view of the injection assembly shown in FIG. 1, showing a drug reservoir vial in place in the injection assembly;

FIG. 7 is a perspective view of the needle of the injection assembly shown in FIG. 1;

FIG. 8 is a schematic cross-sectional view of the needle shown in FIG. 6;

FIG. 9 is a perspective view of a needle of an injection assembly according to another preferred embodiment;

FIG. 10 is a schematic cross-sectional view of the needle shown in FIG. 9;

FIG. 11 is a perspective view of a needle of an injection assembly according to another preferred embodiment;

FIG. 12 is a schematic cross-sectional view of the needle shown in FIG. 11;

FIG. 13 is a schematic view of the needle of FIGS. 11-12 shown in association with a drug storage vial;

FIGS. 14 and 15 are cross-sectional schematic views of the injection assembly of FIG. 1, showing different stages of fluid extraction, respectively;

FIG. 16 is a schematic view of the injection assembly of FIG. 1, with the injection assembly broken away to clearly show the internal structure thereof;

FIG. 17 is a perspective view of the injector head body of the injection assembly of FIG. 1;

fig. 18 is a partially enlarged schematic view of a portion a shown in fig. 14;

FIGS. 19 and 20 are schematic cross-sectional views of the syringe assembly of FIG. 1 showing the operating handle rotated and removed, respectively, after medical fluid withdrawal is complete;

FIGS. 21 and 22 are schematic cross-sectional views of the injection assembly of FIG. 1, before and after rotation of the operating handle, respectively, with the operating handle broken away to clearly show the internal structure thereof;

fig. 23-25 show schematic views of an injection system according to a first preferred embodiment of the present invention in different states, respectively;

FIG. 26 is a perspective view of an injection assembly according to a second preferred embodiment of the present invention;

FIG. 27 is an exploded view of the injection assembly of FIG. 26;

FIG. 28 is a further exploded perspective view of the injection assembly of FIG. 26;

FIG. 29 is a schematic cross-sectional view of the injection assembly shown in FIG. 26, showing a drug vial being placed in the injection assembly;

FIG. 30 is a cross-sectional schematic view of the injection assembly shown in FIG. 26, showing the drug reservoir vial in position in the injection assembly;

FIGS. 31-33 are cross-sectional schematic views of the syringe assembly of FIG. 26, each illustrating a different medical fluid withdrawal stage; and

fig. 34 and 35 are schematic views of the injection assembly of fig. 26 at different stages of injection, respectively.

Detailed Description

Hereinafter, an injection assembly according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. The following is given only by way of preferred embodiments according to the invention, and other ways of carrying out the invention will be apparent to those skilled in the art on the basis of the preferred embodiments, and are within the scope of the invention.

The invention provides a medicine taking needle, an injection assembly comprising the medicine taking needle and an injection system. First, it should be noted that the terms of direction and position of the present invention should be understood as relative direction and relative position. The directional terms and positional terms referred to in the present invention may be understood with reference to the drawings, for example, the "axial direction", etc. referred to in the present invention may be understood as a direction along the X-X direction in fig. 6 or a direction parallel to the X-X direction in fig. 6; references herein to "radial", "radial direction", "circumferential direction" and the like are directions with respect to the X-X axis; reference to "direction of rotation" in the context of the present invention is to be understood as a direction of rotation about the X-X axis, which is substantially equivalent to "circumferential direction".

Fig. 1-35 illustrate an injection assembly and an injection system including the same according to some preferred embodiments of the present invention. Although fig. 1-35 illustrate a needle-free injection assembly, it is to be understood that the present invention can be applied to a needle injection assembly. The injection assembly of the present invention can accurately suck the liquid to be injected into the injection cavity in the injector head body (i.e. the medicine sucking step which will be described later), and accurately determine the injection dosage, and such an injection assembly can adopt a needle-free injection mode and a needle injection mode. Further, the injection assembly of the present invention may also be used to switch between needle and needle-free injection modes. For example, the injection mode of the syringe can be switched from a needleless injection to a needle injection by attaching an injection needle to the injection micro-hole of the injection head body.

Embodiment mode 1

An injection assembly and an injection system according to a first preferred embodiment of the present invention will be described in detail below with reference to fig. 1-25.

As shown in fig. 1-5, the injection assembly 1 generally comprises an injector head body 2, a piston assembly 3, a housing assembly 4, and an operating handle 5. The injector head body 2 is configured in a substantially cylindrical shape, and has an injection cavity 7 inside, and an end of the injector head body 2 is provided with an injection micro-hole 6 communicating the injection cavity 7 and the outside. When an injection operation is intended, the injector head body 2 may be pressed against a site to be injected, for example, the skin of a patient, and when an injection operation (described below) is triggered, a liquid medicine in the injection chamber may be injected into the patient through the injection micro-holes 6. The piston assembly 3 is movably arranged within the injection chamber 7. An operating handle 5 is connected to the piston assembly 3 and is capable of moving the piston assembly 3 within the injection chamber 7. A housing assembly 4 is attached to the injector head body 2, the housing assembly 4 being adapted to receive a drug vial 8 therein. Each component is described in detail below.

Housing assembly 4

As shown in fig. 1 to 4, the housing assembly 4 includes a housing main body 9, a needle 10 for taking medicine, and an elastic washer 11. The housing body 9 is generally cylindrical and has an inner diameter slightly larger than the outer diameter of a conventional drug storage bottle (e.g., vial or cassette) in which the drug storage bottle 8 is placed. The housing body 9 has an open end 12 that is open and an engagement end 13 opposite the open end 12. The drug storage vial 8 may be accessed into the housing body 9 through the open end 12. The engagement end 13 may be used to engage with the injector head body 2.

The needle 10 can be engaged inside the housing body 9. As shown in fig. 7 and 8, the medication needle 10 includes a needle shaft 14 and a medication intake passage 15 opened in the needle shaft 14, and the medication intake passage 15 can communicate the outside with the injection chamber 7 so that the taken medical fluid can enter the injection chamber 7. One end of the medicine dispensing passage 15 has a medicine dispensing port 16 communicating therewith. As shown in fig. 2 and 4, the needle 10 further includes a base 17 attached to the shaft 14, the base 17 being generally configured as a disc and attached to an end of the shaft 14 opposite the needle. The dispensing needle 10 can be placed at the engaging end 13 of the housing body 9 via the seat 17 and, when the dispensing needle 10 is placed in position inside the housing body 9, the needle is directed towards the open end 12 of the housing body 9, whereby, when the drug storage vial 8 is placed in the housing body 9, the needle can pierce the sealing stopper on the drug storage vial 8 to facilitate the entry of the drug solution in the drug storage vial into the injection chamber 7 via the dispensing opening 16 and the dispensing passage 15.

Since the medicine storage bottle 8 is usually placed in an inverted upright state when the medicine in the medicine storage bottle 8 is extracted, as shown in fig. 5 and 6, in order to facilitate the medicine in the medicine storage bottle 8 to be sufficiently sucked into the injection cavity 7, it is preferable that the medicine taking port 16 is opened on the side of the needle rod 14 away from the needle head, that is, the lower end of the medicine taking needle 10 shown in fig. 5 and 6. This scheme can reduce the liquid medicine residue in storing up medicine bottle 8 when drawing the liquid medicine.

Preferably, as shown in fig. 7-10, the needle 10 is further provided with an air passage 18 therein, and the air passage 18 and the medicine taking passage 15 are provided independently of each other. Through setting up air passage 18, can be at the in-process of liquid medicine extraction be convenient for during the air admission medicine storage bottle to can avoid the in-process of extracting the liquid medicine at the inside vacuum that forms of medicine storage bottle 8, and influence the effect of getting it filled. This scheme is particularly useful for storing medicine bottles that the internal volume can not change along with the extraction of inside liquid medicine, for example xiLin bottle. The outlet of the air passage 18 may be open at the needle end of the needle shaft 14 so that the air passage 18 is longer than the access passage 15. The outlet of the air passageway 18 may be on the same side as the access port 16 as shown in figures 7 and 8. In another embodiment, the outlet of the air passage 18 may be located on a different side from the medicine taking port 16, as shown in fig. 9 and 10, and may be set by those skilled in the art according to actual needs.

For a drug storage vial, such as a cartridge vial, whose internal volume decreases as the amount of drug decreases, the air passage may be omitted in the needle 10, as shown in fig. 11 and 12.

As is well known, the sealing plug 19 of the drug storage bottle 8 is typically made of an elastic material so that the needle 10 penetrates the sealing plug 19 into the drug storage chamber to take the drug. Because of the friction between the sealing plug 19 and the medicine taking needle 10, when the medicine taking needle 10 penetrates the sealing plug 19, the part of the sealing plug 19 in contact with the medicine taking needle 10 is deformed and bulges towards the inside of the medicine storage bottle 8. It can be understood that when the medicine taking port on the medicine taking needle is in a downward position, the raised part on the sealing plug wraps the medicine taking port like volcano, so that the medicine taking passage is blocked by the raised part of the sealing plug, and the medicine in the medicine storage bottle is taken.

In order to avoid the above situation, as shown in fig. 7-13, the outer circumference of the needle shaft 14 is provided with a rounded convex structure 20 protruding outward in the radial direction of the needle shaft 14, the convex structure 20 is disposed near the medicine taking port 16, and the outer surface of the convex structure 20 is configured as a cambered surface. Preferably, the point of the raised formation 20 which is furthest from the periphery of the needle shaft 14 (i.e. the most convex point) is higher than the apex of the upward "elastic deformation which occurs when the sealing plug 19 deforms. According to the scheme, the bulge structure 20 is arranged on the outer side of the needle rod 14, so that when the medicine taking needle 10 penetrates through the sealing plug 19 of the medicine storage bottle 8, the elastic sealing plug 19 tends to shrink towards the part with the smaller cross section area on the bulge structure 20, and therefore the sealing plug 19 slides downwards along the curve of the lower end of the bulge structure 20, the deformation of the sealing plug 19 can be changed, the bulge amount of the sealing plug 19 towards the inner part of the medicine storage bottle 8 is reduced, and the sealing plug 19 is prevented from blocking the medicine taking port 16 and the medicine taking passage 15. The directional terms "upper" and "lower" as used herein are used in relation to the orientation of the needle as it is disposed in the drawings, and are not limiting. In addition, this embodiment can also achieve a more sufficient medicine dispensing by setting the medicine dispensing opening 16 of the medicine dispensing passage 15 lower.

In a preferred embodiment, the raised structure 20 has a first projection on a vertical plane parallel to the axial direction of the shaft 14, and the access port 16 has a second projection on the vertical plane, at least a portion of the second projection being within the axial radial extent of the first projection. That is, in the axial direction of the needle shaft 14, the axial extension of the access opening 16 may be partially within the axial extension of the raised structure 20, or the axial extension of the access opening 16 may be entirely within the axial extension of the raised structure 20. Further preferably, all of the second projections are within the axial radiation range of the first projections. That is, the axial extent of the access port 16 is entirely within the axial extent of the raised formation 20, as shown in fig. 7-13.

The raised structures 20 may be disposed continuously around the circumferential direction of the needle shaft 14, or the raised structures 20 may be disposed at intervals around the circumferential direction of the needle shaft 14, as may be desired by those skilled in the art. The raised structures 20 may be radially spaced from the outer periphery of the needle shaft 14 or may be closely affixed to the outer periphery of the needle shaft 14. In the preferred embodiment shown, the raised structure 20 is generally configured in the shape of an arcuate handle, with the raised structure 20 being located generally radially outward of the access port 16, with both ends of the raised structure 20 being attached to the needle shaft 14 above and below the access port 16, respectively, and with the raised portion of the raised structure 20 being spaced from the outer circumference of the needle shaft 14 to expose the access port 16. It should be noted that the directional terms "upper" and "lower" are used herein with respect to the orientation of the needle 10 as shown in the drawings and are not intended to be limiting.

With continued reference to fig. 1-4, the housing assembly 4 further includes a generally circular resilient gasket 11, the resilient gasket 11 being disposed in the housing body 9 and attached to the engagement end 13 of the housing body 9. The resilient gasket 11 is arranged closer to the syringe body 2 than the needle 10. As shown in fig. 18, the elastic pad 11 is provided with a first through hole 21 communicating with the medication intake passage 15 and a second through hole 22 communicating with the air passage 18.

It can be understood that, for the medicine storage bottle 8 with a fixed internal volume, such as a penicillin bottle, when the liquid medicine is sucked into the injection cavity 7, a negative pressure is generated inside the medicine storage bottle 8, and when the negative pressure acts on the elastic gasket 11, the elastic gasket 11 is deformed, so that one end of the elastic gasket is tilted upwards, as shown in fig. 18, at the left end of the elastic gasket 11. Thus, external air can be supplied from the gap between the case main body 9 and the elastic pad 11 into the medicine storage bottle 8 through the second through hole 22 and the air passage 18, thereby equalizing the external pressure in the medicine storage chamber to facilitate the continuous sucking of the medicine liquid smoothly therefrom.

As shown in fig. 4 and 18, preferably, the middle of the joint end 13 is provided with a circular first positioning opening 23, and the elastic pad 11 is provided with a positioning flange 24. In the assembled state, a part of the positioning flange 24 extends into the first positioning opening 23, and the first through hole 21 opens on the positioning flange 24. This solution makes it possible, on the one hand, to facilitate the fitting of the elastic pad over the engagement end 13 and, on the other hand, to prevent the position of the elastic pad 11 from shifting.

As shown in fig. 5, it is preferable that a plurality of barrier ribs 25 are further provided on the inner side wall of the case main body 9, the plurality of barrier ribs 25 being spaced apart in the circumferential direction of the case main body 9. The plurality of blocking ribs 25 can abut against the base 17 of the needle 10 from the side of the needle 10 facing the open end 12 to confine the needle 10 when the needle 10 is placed inside the housing body 9.

In the assembly process of casing subassembly 4, can put into shell main part 9 with elastic gasket 11 and the needle of getting it filled 10 in proper order inside, treat that elastic gasket 11 and the needle of getting it filled 10 when the internally mounted of shell main part 9 targets in place, the last barrier rib 25 of shell main part 9 can cooperate with the needle of getting it filled 10, restricts its position to the stable combination of needle 10, elastic gasket 11 and shell main part 9 of getting it filled is realized.

The process of installing the drug storage vial 8 may be as shown in fig. 5 and 6 by pressing the drug storage vial 8 into the housing body 9 from the open end 12 of the housing body 9 such that the access needle 10 pierces the sealing plug 19 of the drug storage vial 8 to provide communication between the injection chamber 7 and the interior of the drug storage chamber.

In the present embodiment, the injection micro-holes 6 are provided at the first end of the injector head body 2, and the first end of the injector head body 2 is joined to the joint end 13 of the case body 9. The injection micro-hole 6 communicates with the medicine taking passage 15 via the first through-hole 21 in the elastic packing 11.

Referring to fig. 4, the outer side of the joint end 13 of the housing main body 9 (i.e. the side facing the injection micro-hole 6) is provided with a first snap-fit portion 26, the first end of the injector head main body 2 is provided with a ring of snap-fit flanges 27, and the snap-fit flanges 27 can be snapped into the first snap-fit portion 26, so that the housing main body 9 and the injector head main body 2 are jointed. In order to further achieve a firm engagement of the housing main body 9 with the injector head main body 2, preferably, the outer side of the engagement end 13 is provided with a plurality of first snapping portions 26 evenly spaced along the circumferential direction thereof, and exemplarily, in the illustrated embodiment, the outer side of the engagement end 13 is provided with four first snapping portions 26. It is understood that other numbers of first latch portions 26 may be provided as desired by one skilled in the art. In other embodiments, not shown, the snap-in portion may be provided on the injector head body and the snap-in flange or the snap-in groove may be provided on the housing body.

Operating handle

The operating handle 5 is connected to the piston assembly 3, the operating handle 5 can move relative to the injector head main body 2 along the axial direction of the injector head main body 2, and the piston assembly 3 can be synchronously driven to move in the injection cavity 7 in the moving process of the operating handle 5. In actual use, a user can pull the operating handle 5 backwards to drive the piston assembly 3 combined with the operating handle to suck liquid medicine. If air bubbles are found in the medical fluid sucked into the interior of the injection chamber 7 during the medical fluid suction, the operating handle 5 may be pushed forward to discharge the air bubbles, as will be described in detail later.

The operation handle 5 is configured to be able to automatically stop moving when moving to a predetermined position during the drawing of the medical fluid, that is, the operation handle 5 has a stroke limit during the drawing of the medical fluid. Through setting up this stroke limit, can realize the liquid medicine extraction of fixed dose to this scheme can realize extracting the liquid medicine of fixed dose fast, accurately.

Preferably, the operating handle 5 is detachably connected to the injector head body 2. When it is intended to detach the operating handle 5 from the injector head body 2, the operating handle 5 can be rotated, and when the operating handle 5 is rotated into position, it can be easily removed from the injector head body 2, as will be described in detail below.

As shown in fig. 2 and 14 to 17, the operating handle 5 includes a housing portion 28 and an engaging portion 29 provided inside the housing portion 28. The housing part 28 is substantially cylindrical in shape, and the engagement part 29 is also substantially cylindrical in shape and is arranged concentrically with the housing part 28. The housing part 28 can be fitted over the syringe main body 2, the syringe main body 2 has an open opening 30 at one end, and when the housing part 28 is fitted over the syringe main body 2, the joint 29 can extend into the syringe main body 2 through the opening 30 and be detachably connected to the piston assembly 3.

Preferably, the engaging portion 29 is provided with a snap structure 31, the piston assembly 3 comprises a piston 32 and a base portion 33 tightly connected with the piston 32, and the base portion 33 is provided with a catch structure 34 cooperating with the snap structure 31.

In a preferred embodiment, as shown in fig. 15 and 22, the joint 29 includes a support portion 35 and a plurality of axially extending 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, the support portion 35 is connected to the operating handle 5 at an intermediate portion of the end portion thereof, a plurality of axially extending rods 36 are spaced apart from each other in the circumferential direction of the joint portion 29 with a gap between the adjacent axially extending rods 36, and the end portion of each axially extending rod 36 is provided with the snap structure 31. In the illustrated embodiment, the joint 29 includes four axially extending rods 36 evenly spaced in the circumferential direction of the joint 29. It will be appreciated that the number of axially extending rods may be varied as desired by those skilled in the art.

As shown in fig. 21 and 22, the inner periphery of the opening portion 30 is provided with a plurality of protruding portions 37 corresponding to the number of the plurality of axially extending rods 36, and the plurality of protruding portions 37 are evenly spaced in the circumferential direction of the opening portion 30. Referring to 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, so as to prevent the snap structure 31 at the end of the axial extension rod 36 from being separated from the snap groove structure 34 on the piston assembly 3, thereby ensuring that the operating handle 5 and the piston assembly 3 are reliably combined. When it is intended to remove the operating handle 5 from the injector head body 2, the operating handle 5 may be rotated (as will be described in detail below), and with reference to fig. 22, the protrusion 37 may be circumferentially displaced from the axially extending rod 36 when the operating handle 5 is rotated into position, so that the protrusion 37 may no longer abut radially outwardly of the axially extending rod 36, thereby facilitating the removal of the operating handle 5 from the piston assembly 3, and this arrangement may allow the piston assembly 3 to maintain its position when the operating handle 5 is removed, thereby avoiding the need to change the dose of medical fluid drawn into the injection chamber.

In another preferred embodiment, the operating handle 5 has a shape-changing structure at a position where it engages the piston assembly 3, which shape-changing structure is capable of giving the operating handle 5 a tendency to disengage outwardly from the piston assembly 3 when the operating handle 5 engages the piston assembly 3. In the assembled state of the injection assembly, the operating handle 5 is engaged with the piston assembly 3, pushed inside the injection chamber 7, and due to the circumferential limitation of the injection chamber 7, the operating handle 5 and the piston assembly 3 can be kept stably connected. When the restriction of the injection chamber 7 is removed, the deformation structure of the operating handle 5 can restore the outward deformation, so that the operating handle 5 can be easily disconnected from the piston assembly 3.

As shown in fig. 16 and 17, the injection assembly 1 further comprises a limiting structure configured to limit rotation of the operating handle 5 relative to the injector head body 2 in a predetermined state. The predetermined condition may be, for example, when the operating handle 5 moves the piston assembly 3 axially.

In a preferred embodiment, the injector head body 2 is provided with a first flange portion 39 extending in a circumferential direction thereof near the opening portion 30, the first flange portion 39 being provided with a first groove 40. The inner surface of the outer shell 28 is provided with a first protrusion 41, the first protrusion 41 can be matched with the first groove 40, and the first protrusion 41 and the first groove 40 together form a group of limiting structures. Preferably, the first projection 41 has a predetermined length in the axial direction of the housing part 28, the predetermined length of the first projection 41 being set such that it is ensured that the first projection 41 can always be engaged in the first recess 40 before the operating handle 5 is moved to the above-mentioned predetermined position, and the first projection 41 can be disengaged from the first recess 40 when the operating handle 5 is moved to the predetermined position, so that it is possible to avoid hindering the rotation of the operating handle 5 relative to the injector head body 2.

It is further preferred that the injection assembly 1 comprises two sets of stop structures arranged symmetrically with respect to the central axis of the injector head body 2, i.e. two first recesses 40 arranged symmetrically with respect to the central axis of the injector head body 2 are provided on the first flange portion 39 and two first protrusions 41 arranged symmetrically with respect to the central axis of the injector head body 2 are provided on the inner surface of the housing portion 28. It will be appreciated that in other embodiments not shown, the first groove 40 may also be provided on the housing portion 28 and the first projection 41 may be provided on the first flange portion 39.

Preferably, the injection assembly 1 further comprises a stop arrangement configured to limit further axial movement of the operating handle 5 relative to the syringe head body 2 when the operating handle 5 is moved to a predetermined position relative to the syringe head body 2, such that a fixed dose of medical fluid extraction may be achieved.

With continued reference to fig. 16 and 17, in a preferred embodiment, a second protrusion 42 is also provided on the inner surface of the housing portion 28, the second protrusion 42 being provided at the end of the housing portion 28 near the injector head body 2. The injector head body 2 further comprises a second flange portion 43 extending in a circumferential direction thereof, the second flange portion 43 being spaced apart from the first flange portion 39 in an axial direction of the injector head body 2, and the second flange portion 43 being disposed above the first flange portion 39. The second flange portion 43 is provided with a stopper disc 44 extending a predetermined distance in a circumferential direction thereof, the stopper disc 44 being recessed in an axial direction of the second flange portion 43 in a direction toward the opening portion 30, the stopper disc 44 being configured to be able to block an axial movement of the second projection 42, the second projection 42 and the second stopper disc 44 together constituting a set of stopper structures.

Preferably, the injection assembly 1 comprises two sets of stop formations arranged rotationally symmetrically with respect to the central axis of the injector head body 2. That is, the second flange portion 39 is provided with two stopper discs 44 disposed rotationally symmetrically with respect to the center axis of the injector head body 2, and the inner surface of the housing portion 28 is provided with two second protrusions 42 disposed rotationally symmetrically with respect to the center axis of the injector head body 2.

As shown in fig. 17, a second groove 45 is further formed on the second flange portion 43, and the second groove 45 is communicated with the recessed portion of the stopper disc 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 projection 41. That is, the first projection 41 can be engaged with the first groove 40 and the second groove 45 at the same time. Preferably, the second projection 42 is also able to cooperate with both the first recess 40 and the second recess 45.

In a preferred embodiment, the second projection 42 is spaced from the first projection 41 in both the axial direction and the circumferential direction of the housing portion 28. Further preferably, the shortest axial distance between the first projection 41 and the second projection 42 is substantially equal to the distance between the top surface of the stopper disc 44 and the bottom surface of the first flange portion 39, and the circumferential length between the first projection 41 and the second projection 42 adjacent to the first projection 41 is substantially equal to the circumferential length of the stopper disc 44.

The process of aspirating the injection assembly is described in detail below.

When the liquid medicine is to be extracted, 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. During the extraction operation, the first protrusion 41 on the operating handle 5 interacts with the first recess 40 on the syringe body 2 to prevent unintended relative rotation between the operating handle 5 and the syringe body 2. When the operating handle 5 is moved axially to a predetermined position, the second protrusion 42 on the operating handle 5 is blocked by the stop disk 44 on the injector head body 2, so that the operating handle 5 cannot move axially further, and the distance that the operating handle 5 is drawn before the second protrusion 42 contacts the stop disk 44 determines the dose to be taken. When the second protrusion 42 on the operating handle 5 is blocked by the stop disk 44 on the injector head body 2, the first protrusion 41 also just disengages from the first recess 40, so that the rotational movement of the operating handle 5 is no longer restricted.

As shown in fig. 19 and 20, when it is intended to remove the operating handle 5 from the injector head body 2, the operating handle 5 may be rotated first. At this time, the second protrusion 42 abuts against the recessed stopping disc 44, and one end of the second protrusion is blocked by the stopping disc 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 be aligned 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 downwards, and meanwhile, 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 main body 2.

The injection assembly 1 according to this embodiment may be used in cooperation with a pushing device 46 for performing an injection operation, the injection assembly 1 and the pushing device 46 together constituting an injection system 47 according to a preferred embodiment of the present invention. In a preferred embodiment, as shown in fig. 23, the pushing device 46 comprises a housing 48, a push rod 49 disposed inside the housing, and a locking mechanism 50, the push rod 49 being pushable to move relative to the housing 48. At least a portion of the injector head body 2 is engageable in the housing 48, and the push rod 49 is contactable or engageable with the piston assembly 3 to urge the piston assembly 3 in a direction toward the injection micro-bore 6 when an injection operation is performed.

The housing has an open end 51 with a locking mechanism 50 disposed at the open end 51, the locking mechanism 50 being movable between a locked position and an unlocked position. As shown in fig. 24 and 25, when the locking mechanism 50 is in the locking position, the locking mechanism 50 forms a first passage path in the open end 51, and the cross-sectional area of the first passage path is small, so that the syringe main body 2 can be limited conveniently. As shown in fig. 23, when locking mechanism 50 is in the unlocking position, locking mechanism 50 forms a second passage path in open end 51, and the cross-sectional area of the second passage path is large, so that syringe head body 2 can pass through smoothly. Preferably, the cross-sectional area of the first passage path is smaller than the cross-sectional area of the second passage path.

In one embodiment, the locking mechanism 50 may be configured as a snap structure arranged in the circumferential direction of the pushing device 46, which may be moved radially inward to the locked position and also radially outward to the unlocked position. The locking mechanism 50 may be in an unlocked position prior to engagement of the syringe body 2 to the housing 48 and, once the syringe body 2 is in place in the pushing device 46, the locking mechanism 50 may be moved radially inwardly to a locked position in which it snaps into place with the syringe body 2. It will be appreciated that in other embodiments not shown, the locking mechanism may be provided in other configurations, for example the locking mechanism may comprise a plurality of rotatable blocks disposed in an open end in which the rotatable blocks are rotatable to respectively form through paths of different cross-sectional areas.

As shown in fig. 24, after the injector head body 2 is mounted on the pushing device 46, the locking mechanism 50 may be operated to lock the injector head body 2 to limit the axial movement of the injector head body 2. At the same time, the housing assembly 4 may be removed from the injector head body 2 to expose the injection wells 6. When an injection operation is intended, the push rod 49 of the pushing device 46 can be operated to push the piston assembly 3 to eject the liquid medicine from the injection micro-holes 6 for injection, as shown in fig. 25.

Embodiment mode 2

The injection assembly 101 according to the second preferred embodiment of the present invention will be described in detail with reference to fig. 26 to 33.

In this embodiment, as shown in fig. 26-29, the injector head body 102 has a first end 180 and a second end 181 opposite the first end, the injection micro-holes 106 are disposed at the first end 180, and the second end 181 of the injector head body 102 is joined to the joining end 113 of the housing body 109. That is, the injection micro-holes 106 are disposed at an end of the injector head body 102 distal from the housing assembly 104.

As shown in fig. 29 and 30, in the present 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 in a conical shape, and the injection cavity has a shape matching the conical piston. The conical tip can be inserted into the injection well 106. The piston 132 has a first passage 161 provided therein, the first passage 161 being disposed at an angle to the central axis of the injection chamber in the preferred embodiment shown, it being understood that the first passage 161 may be disposed parallel to the central axis of the injection chamber in other embodiments not shown. A second passageway 162 is provided in piston pusher 132, and preferably second passageway 162 extends in the direction of the central axis of the injection chamber. Preferably, the first and

second passages

161, 162 are spaced apart in the radial direction of the injection cavity. The first passage 161 can communicate with the second passage 162, and the second passage 162 communicates with the medicine dispensing passage 115 via the first through hole 121 in the elastic gasket 111.

The process of installing the drug vial 8 is similar to that described in the first embodiment, and as shown in fig. 29 and 30, the drug vial 8 may be pressed into the housing body 109 from the open end 112 of the housing body 109 and the access needle 110 pierces the sealing plug 19 of the drug vial 8 to provide communication between the injection chamber 107 and the interior of the drug chamber.

Referring to fig. 27-29, the piston assembly 103 further includes a piston cap 163, the piston cap 163 being attached to an end of the piston rod 160 opposite the piston 132, preferably, the piston cap 163 being integrally formed with the piston rod 160 as a single piece. The piston cap 163 is connected to the engagement end 113 of the housing body 109 and substantially encloses the engagement end 113 of the housing body 109.

In a preferred embodiment, a generally central portion of the piston cap 163 is provided with a circular second positioning port 164, and the second positioning port 164 communicates with the second passage 162 in the piston rod 160. The resilient pad 111 is provided with a locating flange 124. As shown in fig. 30, in the assembled state, a part of the positioning flange 124 extends into the second positioning hole 164, and the first through hole 121 is opened in the positioning flange 124. This solution may on the one hand facilitate the assembly of the resilient gasket on the piston cap and on the other hand prevent the position of the resilient gasket 111 from shifting. As shown in fig. 32, the piston cap 163 is further provided with an air inlet 182, and the air inlet 182 can communicate with the second through hole 122 of the elastic pad 111. The air inlet 182 may facilitate the entry of air into the drug storage chamber during the drawing of the drug solution.

With continued reference to fig. 28, the piston cap 163 and the housing body 109 are provided with cooperating snap-fit structures, respectively. In a preferred embodiment, the piston cap 163 is provided with a plurality of snap openings 165 near the outer circumference, the housing main body 109 is provided with a plurality of snap fasteners 166 extending toward the piston cap 163 at the circumference, and the plurality of snap fasteners 166 are respectively matched with the plurality of snap openings 165 to realize the connection between the housing main body 109 and the piston cap 163. The clip opening 165 and the clip 166 together form a clip structure. Illustratively, in the illustrated embodiment, the number of the snap openings 165 and the snap fasteners 166 is four, and it will be understood that in other embodiments not shown, one skilled in the art may provide other numbers of snap openings 165 and snap fasteners 166 as needed, or may provide the snap openings on the housing body, the snap fasteners on the piston cap, or the snap structure in other forms.

In the assembling process of the housing assembly 104, the elastic gasket 111 and the drug-taking needle 110 may be sequentially placed on the piston cap 163, and the housing main body 109 and the piston cap 163 may be locked with each other by using the snap-fit structure between the housing main body 109 and the piston cap 163, so as to fix the elastic gasket 111 and the drug-taking needle 110.

In this embodiment, as shown in fig. 26-30, injection assembly 101 further comprises a cap 167, and cap 167 can be disposed over injector head body 102 from first end 180 (i.e., the end where injection pores 106 are disposed) of injector head body 102. An elastomeric seal 168 is disposed in the end cap 167, and the elastomeric seal 168 is sealingly disposed about the injection orifice 106 at the first end 180 of the injector head body 102. The elastic sealing member 168 can seal the injection micro-hole 106 when the liquid medicine is extracted, so that vacuum is formed in the injection cavity 107, and the medicine taking function is guaranteed to be smoothly realized.

Preferably, the resilient seal 168 has an initial state and a deformed state. As shown in fig. 29, in the initial state, the elastic sealing member 168 is partially spaced from the first end 180 of the injector head body 102, and a sealing space is formed between the elastic sealing member 168 and the first end 180 of the injector head body 102, and in the deformed state, the elastic sealing member 168 is pressed in a direction toward the injection micro-holes 106, so that air in the sealing space can be discharged to form a negative pressure in the sealing space.

In a preferred embodiment, as shown in fig. 29 and 30, the elastomeric seal 168 includes a joint portion 169 and a sealing portion 170. The tab 169 is preferably integrally formed with the sealing portion 170. The end of the end cap 167 is provided with a through-hole 171, and the tab 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-like suction cup structure, with the periphery of the sealing portion 170 abutting the first end 180 of the syringe body 102 in the initial state of the elastomeric seal 168.

When the piston assembly 103 inside the injector head body 102 starts to move in a direction away from the injection micro-hole, the gas inside the piston assembly 103 and the needle 110 will be led out into the sealed space formed between the elastic seal 168 and the first end 180 of the injector head body 102 in advance due to the sealing and rebound effect of the elastic seal 168. Preferably, the configuration of the resilient seal 168 and the stroke of the resilient seal that can be compressed can be set as desired to achieve a desired and controlled amount of air entrainment that avoids the creation of air bubbles inside the syringe chamber without wasting too much liquid. Preferably, the elastomeric seal 168 is made of a flexible material such as rubber.

Preferably, as shown in fig. 29, in the initial state of the elastic seal 168, the end of the end cap 167 close to the second end 181 of the syringe main body 102 has a gap in the axial direction with the syringe main body 102, and the axial distance d of the gap is substantially equal to the axial deformation of the elastic seal 168.

As shown in fig. 31, a plurality of second latches 172 are provided in the end cap 167 adjacent to the resilient seal 168, and a ring of snap flanges 127 are provided at the first end of the injector head body 102, the snap flanges 127 being configured to snap into the second latches 172, thereby enabling a secure connection between the end cap 167 and the injector head body 102.

Referring back to fig. 27 and 28, the inner side wall of the end cap 167 is preferably provided with a plurality of guide ribs 173 extending in the axial direction thereof. The plurality of guide ribs 173 are evenly spaced in the circumferential direction of the end cap 167. The injector head body 102 is received in an area surrounded by a plurality of guide ribs 173. This arrangement prevents the syringe main body 102 from being displaced, and allows the syringe main body 102 to be always held in place. 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 being understood that in other embodiments not shown, the inner side wall of the end cap 167 may be provided with other numbers of guide ribs 173.

As shown in fig. 27-30, the end cap 167 is generally configured in a cylindrical shape and includes a first cap portion 174 and a second cap portion 175 connected to the first cap portion 174, the first cap portion 174 having a larger cross-sectional diameter than the second cap portion 175, guide ribs 173 provided on the first cap portion 174, and a second catch portion 172 and a resilient seal 168 provided on the second cap portion 175.

The process of aspirating the injection assembly is described in detail below.

As shown in fig. 29 and 30, when the vial 8 is mounted, in order to complete the piercing operation of piercing the sealing stopper 19 of the vial 8, the operator needs to hold the end cap 167 and press it in the direction of the vial 8 so as to abut against the head body 102. The end cap 167 is now moved the axial distance d of the gap as described above. During the pressing process, the elastic sealing member 168 inside the end cap 167 is pressed and deformed (as shown in fig. 30), so as to exhaust the originally closed gas inside the sealed space, at this time, since the end of the piston 132 seals the injection micro-hole 106, the gas inside the sealed space can be exhausted only from the gap between the elastic sealing member 168 and the injector head main body 102 to the outside, and after the gas inside the sealed space is exhausted, a certain negative pressure is formed between the elastic sealing member 168 and the first end 180 of the injector head main body 102.

As shown in fig. 31, at the moment when the drawing operation of the piston assembly 103 is started, the piston assembly 103 is slightly displaced in a direction away from the injection cavity 107, and the end of the piston 132 is separated from the injection micro-hole 106, thereby releasing the seal of the injection micro-hole 106. The negative pressure created between the resilient seal 168 and the first end 180 of the syringe body 102 will actively draw air from the medical fluid passageway inside the piston assembly 103 and direct it to the enclosed space created between the resilient seal 168 and the first end 180 of the syringe body 102, the air being directed along a path shown by the arrows in fig. 31. With this design, gas in the medical fluid passage inside the piston assembly 103 can be reduced or eliminated, avoiding the generation of bubbles when medical fluid is drawn into the injection chamber 107.

As shown in fig. 32, during the process of drawing the liquid medicine, the piston assembly 103 continues to move in the direction away from the injection micro-holes 106, since the injection micro-holes 106 are sealed by the elastic sealing member 168, a negative pressure is generated in the space formed between the injection cavity 107 and the piston 132, and the negative pressure causes the piston 132 to displace or deform in the direction away from the piston rod 160, so that the first passage and the second passage are communicated, and a liquid medicine passage from the medicine storage bottle 8 to the injection cavity 107 is formed, as shown by the arrow on the right side of fig. 32. Further, as described in the first embodiment, the elastic pad 111 is deformed due to the pressure difference between the outside and the inside of the medicine storage chamber, and external air is supplied to the inside of the medicine storage chamber as shown by the left arrow in fig. 32, which facilitates the drawing of the liquid medicine.

As shown in fig. 33, the piston assembly 103 is operated to a predetermined position and the drawing of the medical fluid is completed. The piston 132 returns to its original shape, so that the first and second passages are no longer in communication, and the liquid medicine passage from the medicine storage chamber to the injection chamber 107 is blocked. And, along with the reduction of the external pressure difference in the medicine storage cavity, the deformation of the elastic gasket 111 recovers, and the external air is no longer supplemented into the medicine storage cavity.

As shown in fig. 34 and 35, during an injection operation, the injection assembly 101 with the cap 167 removed may be mounted to a pushing device (the pushing device is omitted in the figures for simplicity), and the piston assembly 103 is moved by the pushing device in the direction of the injection micro-holes 106, so that the piston 132 may push the medical fluid in the injection cavity 107 to be ejected from the injection micro-holes 106 at the end of the injection cavity 107. When the liquid medicine in the injection chamber 107 is squeezed, the piston 132 is tightly attached to the end of the piston rod 160, thereby reliably sealing the second passage 162 in the piston rod 160 and preventing the liquid medicine from flowing back to the medicine storage chamber.

The protrusions, grooves, flanges, buckles and other matching features in each matching structure group provided in the present embodiment may be structures extending in the circumferential direction and intermittently disposed, or may be structures continuously disposed in the circumferential direction, and the injection assembly may be adjusted in some structures correspondingly.

Although the embodiments of the present invention are exemplified by a needleless syringe, the structure of the present invention can be applied to a needle syringe.

The foregoing description of various embodiments of the invention is provided for the purpose of illustration to one of ordinary skill in the relevant art. It is not intended to be exhaustive or to limit the invention to a single disclosed embodiment. As above, many alternatives and modifications of the present invention will be apparent to those of ordinary skill in the art in light of the above teachings. Thus, while some alternative embodiments are specifically described, other embodiments will be apparent to, or relatively easily developed by, those of ordinary skill in the art. The present invention is intended to embrace all such alternatives, modifications and variances of the present invention described herein, as well as other embodiments that fall within the spirit and scope of the present invention as described above.

Claims

1. A medicine taking needle is characterized in that the medicine taking needle comprises a needle rod and a medicine taking passage arranged in the needle rod, the medicine taking passage is provided with a medicine taking port, the medicine taking port is arranged at one side of the needle rod far away from a needle head,

the periphery of the needle rod is provided with a convex structure which protrudes outwards along the radial direction of the needle rod, the convex structure is provided with a first projection on a vertical surface parallel to the axial direction of the needle rod, the medicine taking port is provided with a second projection on the vertical surface, and at least one part of the second projection is located in the axial radiation range of the first projection.

2. The needle of claim 1, wherein the outer surface of the raised structure is configured as a curved surface.

3. The needle of claim 2 wherein all of the second projection is within an axial radial extent of the first projection.

4. The needle of claim 1 wherein the raised structure is generally configured in the shape of an arcuate handle with a portion of the raised structure radially outward of the access port, the raised structure being spaced from the outer circumference of the shaft to expose the access port.

5. The needle of claim 2, wherein the raised structures are disposed continuously around the circumferential direction of the shaft or the raised structures are disposed at intervals around the circumferential direction of the shaft.

6. The needle of claim 1 further comprising an air passageway disposed therein, the air passageway and the access passageway being disposed independently of one another.

7. The needle of claim 6, wherein the air passageway has a length greater than a length of the access passageway.

8. An injection assembly, comprising:

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

the needle of any one of claims 1 to 7, wherein the access is capable of communicating with the injection lumen.

9. The injection assembly of claim 8, further comprising a housing assembly including a housing body having an open end into which a vial can be inserted and an engagement end opposite the open end, the engagement end being engaged with the injector head body, the access needle being disposed in the housing body.

10. The injection assembly of claim 9, wherein the housing assembly further comprises a resilient gasket disposed in the housing body, the resilient gasket disposed closer to the injector head body than the access needle, the resilient gasket having a first through-hole disposed therein in communication with the access passageway.

11. The injection assembly of claim 9, wherein the housing body is provided with at least one blocking rib on an inner sidewall thereof, the at least one blocking rib configured to abut the needle from a side thereof facing the open end when the needle is placed inside the housing body.

12. The injection assembly of claim 11, wherein the inner sidewall of the housing body is provided with a plurality of blocking ribs that are evenly spaced apart in a circumferential direction of the housing body.

13. The injection assembly of claim 10, wherein the injection micro-hole is disposed at a first end of the injector head body, the first end being joined to an engagement end of the housing body, the injection micro-hole being in communication with the access passage via the first through-hole.

14. The injection assembly of claim 13, wherein a side of the engagement end facing the injection wells is provided with a first snap-fit portion, the first end being provided with a ring of snap-fit flanges configured to snap-fit to the first snap-fit portion.

15. The injection assembly of claim 13, wherein the engagement end has a first locating port disposed thereon, and wherein the resilient gasket has a locating flange disposed thereon, a portion of the locating flange extending into the first locating port, the first through-hole opening in the locating flange.

16. The injection assembly of claim 13, further comprising an operating handle connected to the piston assembly, the operating handle configured to be operable to move the piston assembly within the injection cavity.

17. The injection assembly of claim 16, wherein the operating handle is configured to move relative to the injector head body and to stop moving when moved to a predetermined position.

18. The injection assembly of claim 16, wherein the operating handle is removably connected to the injector head body.

19. The injection assembly of claim 17, wherein the operating handle comprises a housing portion configured in a cylindrical shape and an engagement portion disposed within the housing portion, the engagement portion also configured in a cylindrical shape and disposed concentrically with the housing portion, the housing portion fitting over the injector head body, the injector head body having an open portion through which the engagement portion extends into the injector head body interior and is removably connected to the piston assembly.

20. The injection assembly according to claim 19, wherein the engagement portion is provided with a snap-fit arrangement, the piston assembly comprising a piston and a base portion connected to the piston, the base portion being provided with a catch arrangement cooperating with the snap-fit arrangement.

21. The injection assembly according to claim 20, wherein the engagement portion comprises a support portion and a plurality of axially extending rods connected to and extending from the support portion in a direction towards the piston assembly, the support portion being configured as a hollow cylinder, the plurality of axially extending rods being spaced apart from each other in a circumferential direction of the engagement portion, each axially extending rod comprising the snap feature.

22. The injection assembly of claim 20, wherein an 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, the protrusions being configured to abut against the axially extending rods radially outwardly of the axially extending rods when the operating handle drives the piston to move axially.

23. The injection assembly of claim 19, further comprising a limiting structure configured to limit rotation of the operating handle relative to the injector head body under predetermined conditions.

24. The syringe assembly of claim 23 wherein the syringe body is provided with a first flange portion adjacent the open portion, one of the first flange portion and the housing portion is provided with a first projection, and the other of the first flange portion and the housing portion is provided with a first groove for engaging the first projection, the first projection and the first groove together comprising a set of the retaining structures.

25. The injection assembly according to claim 24, wherein the injection assembly comprises two sets of the stop formations symmetrically arranged with respect to a central axis of the injector head body.

26. The injection assembly of claim 24, wherein the first groove is provided on the first flange portion, the first projection is provided on an inner surface of the housing portion and has a predetermined length in an axial direction of the housing portion, the predetermined length of the first projection is provided such that the first projection can remain engaged in the first groove before the bar handle is moved to the predetermined position, and the first projection is disengaged from the first groove when the bar handle is moved to the predetermined position.

27. The injection assembly of claim 26, further comprising a stop structure configured to limit further axial movement of the operating handle relative to the injector head body when the operating handle is moved to the predetermined position relative to the injector head body.

28. The syringe assembly of claim 27 wherein the housing portion further defines a second projection thereon, the syringe body further comprising a second flange portion spaced from the first flange portion in the axial direction of the syringe body, the second flange portion defining a stop disk extending a predetermined distance in the circumferential direction thereof, the stop disk being recessed in the axial direction of the second flange portion in a direction toward the opening portion, the stop disk being configured to block axial movement of the second projection, the second projection and the second stop disk together defining a set of the stop features.

29. The injection assembly according to claim 28, wherein the injection assembly comprises two sets of the stop formations arranged rotationally symmetrically with respect to a central axis of the injector head body.

30. The injection assembly of claim 28, wherein the second flange portion is further provided with a second groove communicating with the recess of the stop disc, the second groove being located corresponding to the first groove, the second groove being configured to mate with the first protrusion.

31. The injection assembly of claim 30, wherein the second protrusion is configured to mate with the first groove and the second groove.

32. The injection assembly of claim 28, wherein the second protrusion is spaced from the first protrusion in both the axial direction and the circumferential direction of the housing portion.

33. The injection assembly of claim 32, wherein a shortest axial distance between the first projection and the second projection is substantially equal to a distance between a top surface of the stop disc and a bottom surface of the first flange portion, and/or a circumferential length between the first projection and the second projection is substantially equal to the stop disc circumferential length.

34. The injection assembly of claim 10, wherein the injector head body has a first end at which the injection micro-holes are disposed and a second end opposite the first end, the second end being closer to the engagement end of the housing body than the first end.

35. The injection assembly according to claim 34, wherein the piston assembly comprises a piston and a piston rod, one end of the piston rod being engaged with the piston, the piston having a first passage provided therein, the piston rod having a second passage provided therein communicable with the first passage, the second passage being communicable with the drug-taking passage via the first through-hole.

36. The injection assembly of claim 35, further comprising a piston cap connected at an end of the piston rod opposite the piston, the piston cap connected to the engagement end of the housing body.

37. The injection assembly of claim 36, wherein the piston cap is provided with a second locating port, and wherein the resilient gasket is provided with a locating flange, a portion of the locating flange extending into the second locating port, the first through-hole opening in the locating flange.

38. The injection assembly of claim 36, wherein the piston cap is a unitary piece with the piston rod.

39. The injection assembly of claim 36, wherein the piston cap and the housing body are provided with cooperating snap-fit structures, respectively.

40. The injection assembly of claim 39, wherein the piston cap is provided with a plurality of snap openings near an outer periphery thereof, the housing body is provided with a plurality of snap fasteners engaged with the plurality of snap openings, and the snap openings and the snap fasteners together form the snap structure.

41. The injection assembly of claim 34, further comprising:

an end cap fitted over the injector head body from the first end cap, an elastic seal disposed in the end cap, the elastic seal being sealingly disposed at the first end of the injector head body around the injection orifice, wherein the elastic seal has an initial state in which the elastic seal is at least partially spaced apart from the first end of the injector head body and a sealed space is formed between the elastic seal and the first end of the injector head body, and a deformed state in which the elastic seal is configured to be squeezed in a direction toward the injection orifice to form a negative pressure in the sealed space.

42. The injection assembly of claim 41, wherein the resilient seal comprises a sealing portion configured as a bowl-like suction cup structure, a periphery of the sealing portion abutting a first end of the syringe head body in the initial state of the resilient seal.

43. The injection assembly according to claim 42, wherein the end of the end cap is provided with a through-going hole, the resilient seal further comprising a nipple portion connected with the sealing portion, the nipple portion engaging in the through-going hole.

44. The injection assembly according to claim 41, wherein in the initial state of the resilient seal, an end of the end cap proximal to the second end of the syringe body has a gap in an axial direction with the syringe body, the gap having an axial distance substantially equal to an axial deformation of the resilient seal.

45. The injection assembly of claim 41, wherein a second catch is provided in the end cap adjacent the resilient seal, and wherein the first end of the injector head body is provided with a ring of catch flanges configured to catch onto the second catch.

46. The injection assembly of claim 45, wherein the inner side wall of the end cap is provided with a plurality of guide ribs extending in the axial direction thereof.

47. The injection assembly of claim 46, wherein the endcap comprises a first cap portion and a second cap portion connected to the first cap portion, the first cap portion having a larger cross-sectional diameter than the second cap portion, the guide ribs being disposed on the first cap portion, the second snap feature and the resilient seal being disposed on the second cap portion.

48. An injection system, comprising:

the injection assembly of any one of claims 8-47; and