CN115869488A - Injection Components and Injection Systems - Google Patents

Abstract

The invention provides an injection assembly and an injection system. The injection assembly comprises an injection head main body, a piston assembly and an operating handle. An injection cavity is arranged in the injection head main body. A piston assembly is movably disposed within the injection chamber. An operating handle is connected to the piston assembly, the operating handle being configured to be movable relative to the injector head body in an axial direction of the injector head body and to automatically stop moving when moved to a predetermined position. The injection assembly according to the present invention enables a fast and accurate extraction of a fixed dose of medical liquid.

Description

Injection Components and Injection Systems

technical field

The invention relates to the field of medical equipment, especially the field of needle-free injection. More specifically, the present invention relates to an injection assembly and an injection system comprising the same.

Background technique

In the existing syringe, the piston rod is usually pulled manually to suck the medicine liquid in the medicine storage bottle into the injection chamber through the needle when the medicine is taken out. The dose of inhaled medicine needs to be judged by the operator manually reading the scale printed on the outer wall of the injection cavity. This method usually has errors, so it has a certain impact on the precise control of the medicine dose.

Therefore, there is a need to provide an injection assembly and an injection system including the injection assembly to at least partly solve the above-mentioned problems.

Contents of the invention

One aspect of the present invention provides an injection assembly, which includes:

The main body of the injection head, the injection cavity is arranged in the main body of the injection head;

a piston assembly movably disposed within the injection chamber; and

An operating handle, the operating handle is connected to the piston assembly, the operating handle is configured to be able to move relative to the injection head body along the axial direction of the injection head body, and can automatically move to a predetermined position stop moving.

Preferably, the operating handle is detachably connected to the piston assembly.

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

Preferably, the operating handle includes a shell portion and a joint portion disposed inside the shell portion, the shell portion is configured in a cylindrical shape, and the joint portion is also configured in a cylindrical shape and arranged concentrically with the shell portion, so The shell part is sleeved on the outside of the injection head main body, the injection head main body has an opening, the joint part extends into the injection head main body through the opening, and is detachably connected to the piston assembly .

Preferably, the engaging portion is provided with a buckle structure, the piston assembly includes a piston and a base connected to the piston, and the base is provided with a groove structure matched with the buckle structure.

Preferably, the engaging portion includes a support portion and a plurality of axially extending rods connected to the support portion and extending from the support portion in a direction toward the piston assembly, the support portion being configured as a hollow cylinder , the support portion is connected to the end portion of the operating handle, the plurality of axially extending rods are spaced apart from each other in the circumferential direction of the joint portion and there is a gap between adjacent axially extending rods, each Each of the axially extending rods includes the buckle structure.

Preferably, the inner circumference of the opening is provided with a plurality of protrusions corresponding to the number and positions of the plurality of axially extending rods, and the protrusions are configured to drive the piston shaft when the operating handle The radially outer side of the axially extending rod abuts against the axially extending rod when moving in the direction.

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

Preferably, the main body of the injection head is provided with a first flange near the opening, one of the first flange and the shell is provided with a first protrusion, and the first The other of the flange part and the housing part is provided with a first groove that cooperates with the first protrusion, and the first protrusion and the first groove together form a set of the position-limiting structure.

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

Preferably, the first groove is provided on the first flange part, and the first protrusion is provided on the inner surface of the housing part and has a predetermined length in the axial direction of the housing part , the predetermined length of the first protrusion is set so that the first protrusion can remain engaged in the first groove before the joystick moves to the predetermined position, and when the joystick moves When the predetermined position is reached, the first protrusion breaks away from the first groove.

Preferably, the injection assembly further includes a stop structure configured to limit the operation handle relative to the injection head body when the operation handle moves to the predetermined position. Further axial movement of the injection head body.

Preferably, a second protrusion is further provided on the housing part, and the injection head body further includes a second flange part, and the second flange part is aligned with the first flange part in the axial direction of the injection head body. one flange portion is spaced apart, and a stop plate extending along its circumferential direction for a predetermined distance is arranged on the second flange portion, and the stop plate is along the axial direction of the second flange portion Recessed towards the direction of the opening, the stop disc is configured to block the axial movement of the second protrusion, the second protrusion and the second stop disc together form a set of the stop structure.

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

Preferably, the second flange part is also provided with a second groove, the second groove communicates with the depression of the stop disc, and the position of the second groove is the same as that of the first groove Corresponding to the position of , the second groove is configured to be able to cooperate with the first protrusion.

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

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

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

Preferably, the injection assembly also includes a housing assembly, which includes:

a case body, the case body has an open end and an engaging end opposite to the open end, the open end is capable of allowing the medicine storage bottle to enter the case body, and the engaging end is engaged with the injection head body;

A medicine-taking needle, the medicine-taking needle is arranged inside the shell body, and a medicine-taking channel that can communicate with the outside and the injection cavity is arranged in the medicine-taking needle.

Preferably, the housing assembly further includes an elastic gasket, the elastic gasket is arranged in the housing body, the elastic gasket is arranged closer to the injection head body than the medicine taking needle, and the elastic gasket is arranged in the body of the injection head. The gasket is provided with a first through hole communicating with the medicine taking passage.

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

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

Preferably, a plurality of barrier ribs are provided on the inner side wall of the case body, the plurality of barrier ribs are spaced apart in the circumferential direction of the case body, and the plurality of barrier ribs are configured to be able to When the medicine-taking needle is placed inside the shell main body, the side of the medicine-taking needle facing the open end abuts against the medicine-taking needle.

Preferably, the injection head body is provided with injection microholes, the injection microholes are arranged at the first end of the injection head body, the first end is joined to the joint end of the shell body, and the injection The micropore communicates with the medicine taking channel through the first through hole.

Preferably, a first buckle portion is provided on a side of the joint end facing the injection microhole, and a ring of a snap-in flange is provided at the first end, and the snap-in flange is configured to be snap-fit to the The first buckle part.

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

Another aspect of the present invention also provides an injection system, comprising:

The injection assembly as described in any one of the above, one end of the injection head body is provided with injection microholes; and

a pushing device, the pushing device includes a housing and a push rod arranged inside the housing, the pushing rod is movably arranged in the housing, at least a part of the injection head body can be engaged in the and the push rod is configured to be able to contact or engage with the piston assembly to push the piston assembly in a direction toward the injection microhole.

Preferably, the pushing device further comprises a locking mechanism, the housing has an open end, the locking mechanism is disposed at the open end, the locking mechanism is movable between a locked position and an unlocked position,

wherein when the locking mechanism is in the locked position, the locking mechanism forms a first passage path in the open end, and when the locking mechanism is in the unlocked position, the locking mechanism A second passing path through which the injection head main body can pass is formed in the open end, and a cross-sectional area of the first passing path is smaller than a cross-sectional area of the second passing path.

According to the injection assembly and the injection system of the present invention, when the operating handle moves to a predetermined position, it automatically stops moving, and at this time, the medicinal liquid extracted from the injection cavity also reaches a preset value correspondingly. The above solution can realize the extraction of a fixed dose of medicinal liquid by setting the limit position of the operating handle, so that the fixed dose of medicinal liquid can be extracted quickly and accurately each time the medicinal liquid is extracted.

In addition, the injection assembly according to the present invention utilizes the interlocking structure of the main body of the injection cavity and the operating handle, so that the operating handle can be separated from the piston smoothly, avoiding the influence of the amount of medicine taken due to changing the position of the piston.

Description of drawings

For a better understanding of the above and other objects, features, advantages and functions of the present invention, reference may be made to the preferred embodiments shown in the accompanying drawings. The same or similar reference numerals refer to the same or similar components in the drawings. Those skilled in the art should understand that the accompanying drawings are intended to schematically illustrate preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and components in the drawings are not drawn 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 diagram of the injection assembly in Fig. 1;

Fig. 3 is another three-dimensional schematic diagram of the injection assembly in Fig. 1, but the up and down direction in the drawing is opposite to Fig. 1;

Fig. 4 is an exploded schematic diagram of the injection assembly in Fig. 3;

Fig. 5 is a schematic cross-sectional view of the injection assembly shown in Fig. 1, which shows a drug storage bottle to be put into the injection assembly;

Fig. 6 is a schematic cross-sectional view of the injection assembly shown in Fig. 1, wherein the drug storage bottle has been placed in place in the injection assembly;

Fig. 7 is a three-dimensional schematic diagram of the medicine-taking needle of the injection assembly shown in Fig. 1;

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

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

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

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

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

Fig. 13 is a schematic diagram of the medicine-taking needle shown in Fig. 11-Fig. 12 when it is combined with the medicine storage bottle;

Fig. 14 and Fig. 15 are schematic cross-sectional views of the injection assembly shown in Fig. 1, respectively showing different liquid medicine extraction stages;

Fig. 16 is a schematic diagram of the injection assembly shown in Fig. 1, wherein the injection assembly is cut away to clearly show its internal structure;

Fig. 17 is a schematic perspective view of the main body of the injection head of the injection assembly shown in Fig. 1;

Fig. 18 is a partially enlarged schematic diagram of part A shown in Fig. 14;

Fig. 19 and Fig. 20 are schematic cross-sectional views of the injection assembly shown in Fig. 1, respectively showing the state of the operating handle being rotated and the state of being removed after the liquid medicine is extracted;

Figure 21 and Figure 22 are schematic cross-sectional views of the injection assembly shown in Figure 1 before and after the rotation of the operating handle, wherein the operating handle is cut away to clearly show its internal structure;

23-25 respectively show schematic diagrams of the injection system in different states according to the first preferred embodiment of the present invention;

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

Fig. 27 is an exploded schematic diagram of the injection assembly in Fig. 26;

Figure 28 is a further exploded perspective view of the injection assembly in Figure 26;

Fig. 29 is a schematic cross-sectional view of the injection assembly shown in Fig. 26, showing the drug storage bottle to be placed into the injection assembly;

Fig. 30 is a schematic cross-sectional view of the injection assembly shown in Fig. 26, wherein the drug storage bottle is shown in place in the injection assembly;

Figures 31-33 are schematic cross-sectional views of the injection assembly shown in Figure 26, respectively showing different liquid medicine extraction stages; and

34 and 35 are schematic diagrams of the injection assembly shown in FIG. 26 at different injection stages.

Detailed ways

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 are only preferred embodiments of the present invention, those skilled in the art can think of other ways to realize the present invention on the basis of the preferred embodiments, and other ways also fall within the scope of the present invention.

The invention provides an injection assembly and an injection system. First of all, it needs to be explained that the terms of direction and position mentioned in the present invention should be understood as relative directions and relative positions. The direction terms and position terms mentioned in the present invention can be understood with reference to the accompanying drawings. For example, the "axial direction" and "axial direction" mentioned in the present invention can be understood as along the X-X direction or in the accompanying drawing 6 The direction parallel to the X-X direction in accompanying drawing 6; The "radial direction", "radial direction", "circumferential direction" and "circumferential direction" mentioned in the present invention are all directions about the X-X axis; the present invention The "direction of rotation" mentioned may be understood as the direction of rotation around the X-X axis, which is roughly equivalent to the "circumferential direction".

1-35 illustrate an injection assembly and an injection system including the injection assembly according to some preferred embodiments of the present invention. Although FIGS. 1-35 illustrate needleless injection assemblies, it is understood that the present invention can be applied to needle injection assemblies. The injection assembly of the present invention can accurately draw the liquid to be injected into the injection cavity in the main body of the injection head (that is, the drug suction step described later), so as to accurately determine the injection dose. Such an injection assembly can be used without needles The way of injection can also be the way of needle injection. Further, the injection assembly of the present invention can also realize switching between needle-based and needle-free injection methods. For example, installing an injection needle on the injection microhole of the main body of the injection head can switch the injection mode of the syringe from needleless injection to needle injection.

Embodiment 1

The injection assembly and the injection system according to the first preferred embodiment of the present invention are described in detail below with reference to FIGS. 1-25 .

As shown in FIGS. 1-5 , the injection assembly 1 generally includes an injection head body 2 , a piston assembly 3 , a housing assembly 4 and an operating handle 5 . The main body of the injection head 2 is roughly configured in a cylindrical shape with an injection chamber 7 inside, and an injection microhole 6 communicating with the injection chamber 7 and the outside is provided at the end of the injection head body 2 . When an injection operation is intended, the injection head body 2 can be pressed against the site to be injected, such as the patient's skin, and when the injection operation (described below) is triggered, the medicinal liquid in the injection cavity can be injected through the injection microhole 6 inside the patient. The piston assembly 3 is movably arranged in the injection cavity 7 . The operating handle 5 is connected to the piston assembly 3 and can drive the piston assembly 3 to move in the injection cavity 7 . The housing assembly 4 is connected to the injection head body 2, and the housing assembly 4 can accommodate a drug storage bottle 8 therein. Each component is described in detail below.

Housing assembly 4

As shown in FIGS. 1-4 , the housing assembly 4 includes a housing body 9 , a medicine taking needle 10 and an elastic gasket 11 . The shell main body 9 is roughly cylindrical, and its inner diameter is slightly larger than the outer diameter of conventional medicine storage bottles (such as vials or cartridges, etc.), allowing the medicine storage bottle 8 to be placed therein. The case main body 9 has an open end 12 opened and an engaging end 13 opposite to the open end 12 . The vial 8 is accessible through the open end 12 into the housing body 9 . Engagement end 13 is available for engagement with injection head body 2 .

The medicine taking needle 10 can be engaged inside the case main body 9 . As shown in Figures 7 and 8, the medicine-taking needle 10 includes a needle bar 14 and a medicine-taking channel 15 provided in the needle bar 14, and the medicine-taking channel 15 can communicate with the outside and the injection cavity 7, so that the medicine liquid obtained can be Enter the injection chamber 7. One end of the medicine taking passage 15 has a medicine taking port 16 communicating therewith. As shown in FIGS. 2 and 4 , the medicine taking needle 10 further includes a base 17 connected to the needle shaft 14 , the base 17 is roughly configured in a disk shape and connected to an end of the needle shaft 14 opposite to the needle head. The medicine-taking needle 10 can be placed at the joint end 13 of the case body 9 via the base 17. When the medicine-taking needle 10 is placed in place inside the case body 9, the needle head faces the open end 12 of the case body 9. Thus, when the medicine is stored When the bottle 8 is put into the shell body 9, the needle can pierce the sealing plug on the medicine storage bottle 8, so that the medicine liquid in the medicine storage bottle enters the injection cavity 7 through the medicine taking port 16 and the medicine taking passage 15.

Because when extracting the medicinal liquid in the medicinal storage bottle 8, the medicinal storage bottle 8 is usually placed in an upside-down vertical state, as shown in Figures 5 and 6, in order to facilitate the medicinal liquid in the medicinal storage bottle 8 to be fully Inhaled into the injection chamber 7, preferably, the medicine taking port 16 is set on the side of the needle shaft 14 away from the needle, that is, the lower end of the medicine taking needle 10 shown in Fig. 5 and Fig. 6 . This scheme can reduce the residue of medicinal liquid in the medicinal storage bottle 8 when the medicinal liquid is extracted.

Preferably, as shown in FIGS. 7-10 , an air passage 18 is further provided in the medicine-taking needle 10 , and the air passage 18 and the medicine-taking passage 15 are provided independently of each other. By arranging the air passage 18, air can be facilitated to enter the medicine storage bottle during the process of extracting the medicine solution, thereby avoiding the formation of a vacuum inside the medicine storage bottle 8 during the process of extracting the medicine solution, thereby affecting the effect of taking medicine. This solution is especially suitable for medicine storage bottles whose internal volume does not change with the extraction of the medicine liquid inside, such as vials. The outlet of the air passage 18 can be opened at the needle end of the needle bar 14, so the air passage 18 is longer than the medicine-taking passage 15. The outlet of the air passage 18 can be on the same side as the medicine taking port 16, as shown in FIGS. 7 and 8 . In another embodiment, the outlet of the air passage 18 may also be on a different side from the medicine inlet 16, as shown in Fig. 9 and Fig. 10 , those skilled in the art may set it according to actual needs.

For the medicine storage bottle whose internal volume decreases with the decrease of the medicine amount, such as a cartridge, the air passage can be omitted in the medicine taking needle 10, as shown in FIG. 11 and FIG. 12 .

As we all know, the sealing plug 19 of the medicine storage bottle 8 is usually made of elastic material, so that the medicine taking needle 10 can pierce the sealing plug 19 and enter the medicine storage cavity for taking medicine. Due to the frictional force between the sealing plug 19 and the medicine-taking needle 10, when the medicine-taking needle 10 pierces the sealing plug 19, the part of the sealing plug 19 in contact with the medicine-taking needle 10 will be deformed and protrude toward the inside of the medicine storage bottle 8. . It can be understood that when the position of the medicine taking port on the medicine taking needle is lower, the protruding part on the sealing plug will wrap the medicine taking port like a volcano, causing the medicine taking channel to be blocked by the protruding part of the sealing plug, affecting the extraction Medicine liquid in medicine storage bottle.

In order to avoid the occurrence of the above situation, as shown in Figure 7-Figure 13, the outer periphery of the needle bar 14 is provided with a smooth protruding structure 20 protruding outward along the radial direction of the needle bar 14, and the protruding structure 20 is close to the medicine taking The opening 16 is provided, and the outer surface of the protruding structure 20 is configured as an arc surface. Preferably, the point on the protruding structure 20 farthest from the outer circumference of the needle bar 14 (that is, the most convex point) is higher than the "upward" elastic deformation apex generated when the sealing plug 19 is deformed. This solution arranges the raised structure 20 on the outside of the needle shaft 14, so that when the medicine-taking needle 10 pierces through the sealing plug 19 of the medicine storage bottle 8, the elastic sealing plug 19 will tend to move toward the upper cross-sectional area of the raised structure 20. The smaller part shrinks, so the sealing plug 19 will slide "downward" along the curve of the "lower" end of the raised structure 20, so that the deformation of the sealing plug 19 can be changed, and the amount of protrusion of the sealing plug 19 to the inside of the medicine storage bottle 8 can be reduced , and then prevent the sealing plug 19 from blocking the medicine taking port 16 and the medicine taking passage 15 . The directional terms "up" and "down" mentioned here are only relative to the arrangement orientation of the medicine-taking needle in the figure, and are not limiting. In addition, this solution can also set the medicine taking port 16 of the medicine taking passage 15 lower, so as to realize more sufficient medicine taking.

In a preferred embodiment, the protruding structure 20 has a first projection on a vertical plane parallel to the axial direction of the needle shaft 14, the medicine-taking port 16 has a second projection on the vertical plane, and at least A part is within the axial radiation range of the first projection. That is to say, in the axial direction of the needle shaft 14, the axial extension of the medicine taking port 16 can be partly within the range of the axial extension of the protruding structure 20, or the axial extension of the medicine taking port 16 can be completely The ground is within the range of the axial extension of the protruding structure 20 . Further preferably, all of the second projection is within the axial radiation range of the first projection. That is to say, the axial extension of the medicine taking port 16 is entirely within the range of the axial extension of the protruding structure 20 , as shown in FIGS. 7-13 .

The protruding structures 20 can be arranged continuously around the circumferential direction of the needle bar 14 for one circle, or the protruding structures 20 can also be arranged at intervals around the circumferential direction of the needle bar 14 , those skilled in the art can set according to actual needs. The protruding structure 20 can be radially spaced from the outer circumference of the needle shaft 14 , or can be closely attached to the outer circumference of the needle shaft 14 . In the preferred embodiment shown in the figure, the protruding structure 20 is roughly configured in the shape of an arc-shaped handle, and the protruding structure 20 is generally located on the radially outer side of the medicine taking port 16. The upper and lower parts are attached to the needle bar 14 , and the protruding part of the raised structure 20 is spaced apart from the outer circumference of the needle bar 14 to expose the medicine taking port 16 . It should be noted that the directional terms "up" and "down" mentioned here are relative to the orientation of the medicine taking needle 10 shown in the figure, and are not limiting.

Continuing to refer to FIGS. 1-4 , the shell assembly 4 further includes a substantially circular elastic washer 11 disposed in the shell body 9 and attached to the joint end 13 of the shell body 9 . The elastic gasket 11 is arranged closer to the main body 2 of the injection head than the medicine taking needle 10 . As shown in FIG. 18 , the elastic gasket 11 is provided with a first through hole 21 communicating with the medicine taking passage 15 and a second through hole 22 communicating with the air passage 18 .

It can be understood that for a medicine storage bottle 8 with a fixed internal volume, such as a vial, when the medicinal liquid is sucked into the injection chamber 7, a negative pressure will be generated inside the medicine storage bottle 8. When the negative pressure acts on the elastic gasket 11, The elastic washer 11 will be deformed, causing one end of the elastic washer 11 to tilt upward, as shown in FIG. 18 , the left end of the elastic washer 11 . Thus, external air can be filled into the drug storage bottle 8 from the gap between the shell main body 9 and the elastic gasket 11 through the second through hole 22 and the air passage 18, so that the internal and external pressures of the drug storage cavity are balanced for smooth operation. Continuously draw liquid medicine from it.

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

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

During the assembly process of the housing assembly 4, the elastic gasket 11 and the medicine-taking needle 10 can be put into the inside of the shell main body 9 sequentially. The blocking rib 25 on the main body 9 cooperates with the medicine taking needle 10 to limit its position, so as to realize the stable combination of the medicine taking needle 10 , the elastic gasket 11 and the shell main body 9 .

The process of installing the medicine storage bottle 8 can be shown in Figure 5 and Figure 6, the medicine storage bottle 8 is pressed into the shell body 9 from the open end 12 of the shell body 9, so that the medicine taking needle 10 punctures the seal of the medicine storage bottle 8 The plug 19 forms the communication between the injection chamber 7 and the medicine storage chamber.

In this embodiment, the injection microhole 6 is disposed at the first end of the injection head body 2 , and the first end of the injection head body 2 is joined to the joint end 13 of the shell body 9 . The injection microhole 6 communicates with the drug-taking channel 15 through the first through hole 21 on the elastic gasket 11 .

Referring to FIG. 4 , the outer side of the joint end 13 of the shell body 9 (that is, the side facing the injection microhole 6 ) is provided with a first buckle portion 26 , and the first end of the injection head main body 2 is provided with a ring of buckle flanges 27 , the locking flange 27 can be locked to the first locking portion 26 , so that the shell main body 9 and the injection head main body 2 are engaged. In order to further realize the stable joint between the shell main body 9 and the injection head main body 2, preferably, the outside of the joint end 13 is provided with a plurality of first buckle parts 26 evenly spaced along its circumferential direction. In this way, four first buckle parts 26 are provided on the outer side of the joint end 13 . It can be understood that those skilled in the art can also provide other numbers of first buckling parts 26 as required. In other embodiments not shown, the buckle part may also be provided on the injection head main body, and the buckle flange or the buckle groove may be provided on the shell main body.

Operating handle

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

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

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

As shown in FIG. 2 and FIGS. 14-17 , the operating handle 5 includes a shell portion 28 and an engaging portion 29 disposed inside the shell portion 28 . The housing part 28 is substantially cylindrical, and the joint part 29 is also substantially cylindrical and is arranged concentrically with the housing part 28 . The shell part 28 can be sleeved on the outside of the injection head body 2, and one end of the injection head body 2 has an open opening 30. When the shell part 28 is sleeved on the outside of the injection head body 2, the joint part 29 can extend to the injection site through the opening 30. Inside the head body 2, and detachably connected to the piston assembly 3.

Preferably, the engaging portion 29 is provided with a buckle structure 31 , the piston assembly 3 includes a piston 32 and a base 33 closely connected with the piston 32 , and the base 33 is provided with a groove structure 34 matched with the buckle structure 31 .

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

As shown in FIGS. 21 and 22 , the inner periphery of the opening 30 is provided with a plurality of protrusions 37 corresponding to the number of axially extending rods 36 , and the plurality of protrusions 37 are evenly spaced along the circumferential direction of the opening 30 . . Referring to Fig. 21, when the operating handle 5 drives the piston 32 to move axially, the protruding part 37 can just abut against the radially outer side of the axially extending rod 36, so as to avoid the snap-fit structure 31 at the end of the axially extending rod 36 and the piston assembly. The slot structure 34 on the 3 is disengaged, so that the reliable combination of the operating handle 5 and the piston assembly 3 can be ensured. When the operating handle 5 is intended to be removed from the injection head main body 2, the operating handle 5 can be rotated (described in detail below). Referring to FIG. Stagger to the extension rod 36, so that the protrusion 37 can no longer abut against the radially outer side of the axial extension rod 36, thereby facilitating the disassembly of the operating handle 5 and the piston assembly 3, and this scheme can make the piston assembly 3 in the operating handle 5 keeps its position when it is removed, so as to avoid changing the dosage of the medicinal liquid drawn into the injection cavity.

In another preferred embodiment, the position where the operating handle 5 engages with the piston assembly 3 has a deformed structure, and the deformed structure can make the operating handle 5 move outward from the piston assembly 3 when the operating handle 5 is engaged with the piston assembly 3 . trend away. In the assembled state of the injection assembly, the operating handle 5 engages with the piston assembly 3 and is pushed into the injection cavity 7 . Due to the circumferential restriction of the injection cavity 7 , the operating handle 5 and the piston assembly 3 can maintain a stable connection. After the restriction of the injection chamber 7 is removed, the deformation structure on the operating handle 5 can resume outward deformation, so that the operating handle 5 can be easily disconnected from the piston assembly 3 .

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

In a preferred embodiment, the injection head main body 2 is provided with a first flange portion 39 extending along its circumferential direction near the opening portion 30 , and a first groove 40 is provided on the first flange portion 39 . A first protrusion 41 is disposed on the inner surface of the shell portion 28 , and the first protrusion 41 can cooperate with the first groove 40 . The first protrusion 41 and the first groove 40 together form a set of limiting structures. Preferably, the first protrusion 41 has a predetermined length in the axial direction of the housing portion 28, and the predetermined length of the first protrusion 41 is set so as to ensure that the first protrusion 41 can Always engaged in the first groove 40 , and the first protrusion 41 can disengage from the first groove 40 when the operating handle 5 moves to a predetermined position, so as to avoid hindering the rotation of the operating handle 5 relative to the injection head body 2 .

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

Preferably, the injection assembly 1 further includes a stop structure configured to limit further axial movement of the operating handle 5 relative to the injection head body 2 when the operating handle 5 moves relative to the injection head body 2 to a predetermined position, Thereby, the extraction of a fixed dose of medicinal liquid can be realized.

Continuing to refer to FIG. 16 and FIG. 17 , in a preferred embodiment, a second protrusion 42 is provided on the inner surface of the housing portion 28 , and the second protrusion 42 is disposed at the end of the housing portion 28 close to the injection head main body 2 place. The injection head body 2 also includes a second flange portion 43 extending in the circumferential direction thereof, the second flange portion 43 is spaced apart from the first flange portion 39 in the axial direction of the injection head body 2, and the second flange portion 43 is provided above the first flange portion 39 . The second flange portion 43 is provided with a stop plate 44 extending a predetermined distance along its circumferential direction, and the stop plate 44 is recessed in the axial direction of the second flange portion 43 along the direction toward the opening portion 30 to stop The stop disc 44 is configured to block the axial movement of the second protrusion 42 , and the second protrusion 42 and the second stop disc 44 together form a set of stop structures.

Preferably, the injection assembly 1 includes two sets of stop structures arranged rotationally symmetrically with respect to the central axis of the injection head body 2 . That is to say, the second flange part 39 is provided with two stop discs 44 which are rotationally symmetrical with respect to the central axis of the injection head body 2 , and the inner surface of the shell part 28 is provided with a Two second protrusions 42 are arranged rotationally symmetrically to the central axis.

As shown in FIG. 17 , a second groove 45 is formed on the second flange portion 43 , and the second groove 45 communicates with the depression of the stop plate 44 . The position of the second groove 45 corresponds to the position of the first groove 40 , that is to say, the position of the second groove 45 on the second flange portion 43 is the same as that of the first groove 40 on the first flange portion 39 The location is roughly the same. The second groove 45 can also cooperate with the first protrusion 41 . That is, the first protrusion 41 can engage with the first groove 40 and the second groove 45 at the same time. Preferably, the second protrusion 42 is also able to cooperate with both the first groove 40 and the second groove 45 .

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

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

When intending to extract the liquid medicine, the user can pull the operating handle 5 away from the medicine storage bottle 8, and the operating handle 5 drives the piston assembly 3 to move synchronously. During the extraction operation, the first protrusion 41 on the operating handle 5 interacts with the first groove 40 on the injection head body 2 to prevent unintended relative rotation between the operating handle 5 and the injection head body 2 . When the operating handle 5 axially moves to a predetermined position, the second protrusion 42 on the operating handle 5 is blocked by the stop disc 44 on the injection head main body 2 so that the operating handle 5 cannot move axially further, and the second protrusion 42 The distance that the operating handle 5 is drawn before contacting the stop disc 44 determines the dose of medicine to be taken. When the second protrusion 42 on the operating handle 5 is blocked by the stop plate 44 on the injection head main body 2, the first protrusion 41 is also just disengaged from the first groove 40, so that the rotational movement of the operating handle 5 is no longer restricted.

As shown in Fig. 19 and Fig. 20, when it is intended to remove the operating handle 5 from the main body 2 of the injection head, the operating handle 5 can be rotated first. Since the second protrusion 42 abuts against the recessed stop disc 44 at this time, one end is blocked by the stop disc 44, so that the second protrusion 42 can only rotate along the direction towards the second groove 45, when it rotates to When the second protrusion 42 is 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 can be pulled downwards. At the same time, the second protrusion 42 can follow the second groove. 45 and the first groove 40 slide down, so that the operating handle 5 can be disengaged from the injection head main body 2 smoothly.

The injection assembly 1 according to the present embodiment can be used in cooperation with the pushing device 46 for injection operation, and the injection assembly 1 and the pushing device 46 together constitute the injection system 47 according to the preferred embodiment of the present invention. In a preferred embodiment, as shown in FIG. 23 , the pushing device 46 includes a housing 48 , a push rod 49 disposed inside the housing and a locking mechanism 50 , and the push rod 49 can be pushed to move relative to the housing 48 . At least a part of the injection head body 2 can be engaged in the housing 48, and the push rod 49 can contact or engage with the piston assembly 3 to push the piston assembly 3 toward the injection microhole 6 during injection operation.

The housing has an open end 51 at which a locking mechanism 50 is provided, the locking mechanism 50 being movable between a locked position and an unlocked position. Wherein, as shown in Fig. 24 and Fig. 25, when the locking mechanism 50 is in the locking position, the locking mechanism 50 forms a first passing path in the open end 51, and the cross-sectional area of the first passing path is relatively small, which can facilitate the The injection head main body 2 is limited. As shown in Figure 23, when the locking mechanism 50 is in the unlocked position, the locking mechanism 50 forms a second passing path in the open end 51, and the cross-sectional area of the second passing path is relatively large, allowing the main body 2 of the injection head to pass through smoothly. . Preferably, the cross-sectional area of the first passing path is smaller than the cross-sectional area of the second passing path.

In one embodiment, the locking mechanism 50 can be configured as a buckle structure arranged along the circumferential direction of the pushing device 46, and the buckle structure can move radially inward to the locked position, and can also move radially outward to the unlocked position. Location. The locking mechanism 50 can be in the unlocked position before the injection head body 2 is engaged to the housing 48, and when the injection head body 2 is installed in the pushing device 46, the locking mechanism 50 can be moved radially inwards to snap into the injection head Locked position of body 2. It can be understood that in other embodiments not shown, the locking mechanism can also be configured in other structures, for example, the locking mechanism can include a plurality of rotating blocks arranged in the open end, and the rotating blocks can rotate in the open end, To form passing paths with different cross-sectional areas.

As shown in FIG. 24 , after the injection head body 2 is installed on the pushing device 46 , the locking mechanism 50 can be operated to lock the injection head body 2 to limit the axial movement of the injection head body 2 . At the same time, the shell assembly 4 can be removed from the injection head main body 2 to expose the injection microhole 6 . When it is intended to perform an injection operation, the push rod 49 of the push device 46 can be operated to push the piston assembly 3 so that the medicinal liquid is ejected from the injection microhole 6 for injection, as shown in FIG. 25 .

Embodiment 2

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

In this embodiment, as shown in FIGS. 26-29 , the injection head body 102 has a first end 180 and a second end 181 opposite to the first end, the injection microhole 106 is arranged at the first end 180, and the injection head body The second end 181 of 102 is joined to the joint end 113 of the housing body 109 . That is to say, the injection microhole 106 is disposed at the end of the injection head body 102 away from the housing assembly 104 .

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

The process of installing the medicine storage bottle 8 is similar to the process described in the first embodiment. As shown in FIG. 29 and FIG. The medicine needle 110 pierces the sealing plug 19 of the medicine storage bottle 8 to form the communication between the injection chamber 107 and the inside of the medicine storage chamber.

Referring to FIGS. 27-29 , the piston assembly 103 further includes a piston cap 163 connected to the end of the piston rod 160 opposite to the piston 132 . Preferably, the piston cap 163 and the piston rod 160 are integrally formed as a whole. The piston cap 163 is connected to the engagement end 113 of the case body 109 and substantially closes the engagement end 113 of the case body 109 .

In a preferred embodiment, a circular second positioning opening 164 is provided at approximately the middle of the piston cap 163 , and the second positioning opening 164 communicates with the second passage 162 in the piston rod 160 . A positioning flange 124 is disposed on the elastic washer 111 . As shown in FIG. 30 , in the assembled state, a part of the positioning flange 124 extends into the second positioning opening 164 , and the first through hole 121 is opened on the positioning flange 124 . On the one hand, this solution can facilitate the assembly of the elastic washer on the piston cap, and on the other hand, it can prevent the position of the elastic washer 111 from shifting. As shown in FIG. 32 , an air inlet 182 is further provided on the piston cap 163 , and the air inlet 182 can communicate with the second through hole 122 on the elastic washer 111 . The air inlet 182 can facilitate air to enter the drug storage cavity during the process of extracting the drug solution.

Continuing to refer to FIG. 28 , the piston cap 163 and the housing body 109 are respectively provided with interfitting engagement structures. In a preferred embodiment, the piston cap 163 is provided with a plurality of snap-fit openings 165 near the outer periphery, and the periphery of the housing body 109 is provided with a plurality of snap-fit buckles 166 extending toward the piston cap 163, and the plurality of snap-fit buckles 166 They are respectively matched with a plurality of locking openings 165 to realize the connection between the housing body 109 and the piston cap 163 . The locking opening 165 and the locking buckle 166 together form a locking structure. Exemplarily, in the illustrated embodiment, the number of snap-in openings 165 and snap-in buckles 166 are four respectively. It can be understood that in other embodiments not shown, those skilled in the art can set other The number of snap-in openings 165 and snap-in buckles 166, or the snap-in openings can be arranged on the shell body, the snap-in buckles can be arranged on the piston cap, or the snap-in structure can be set in other forms.

During the assembly process of the housing assembly 104, the elastic gasket 111 and the medicine taking needle 110 can be placed on the piston cap 163 in sequence, and then the housing main body 109 and the piston cap can be realized by using the clamping structure on the housing main body 109 and the piston cap 163. 163 are interlocked, so that the elastic washer 111 and the medicine taking needle 110 are fixed.

As shown in FIGS. 26-30 , in this embodiment, the injection assembly 101 further includes an end cap 167, which can be set from the first end 180 of the injection head body 102 (that is, the end where the injection microhole 106 is set) Set on the injection head main body 102. An elastic seal 168 is disposed in the end cap 167 , and the elastic seal 168 is disposed on the first end 180 of the injection head main body 102 to seal around the injection microhole 106 . The elastic sealing member 168 can seal the injection microhole 106 when extracting the liquid medicine, thereby forming a vacuum inside the injection chamber 107 to ensure the smooth realization of the medicine taking function.

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

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

When the piston assembly 103 inside the injection head main body 102 starts to move away from the injection microhole, due to the sealing and rebound effect of the elastic seal 168, the gas inside the piston assembly 103 and the medicine-taking needle 110 will be led out to the In the sealed space formed between the elastic sealing member 168 and the first end 180 of the injection head body 102 . Preferably, the structure of the elastic seal 168 and the stroke that can be compressed can be set according to needs, so that a desired and controllable air export volume can be obtained, so as to avoid the generation of air bubbles in the injection cavity without wasting too much liquid medicine Effect. Preferably, the elastic sealing member 168 can be made of flexible materials such as rubber.

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

As shown in FIG. 31 , a plurality of second buckle parts 172 are arranged in the end cap 167 close to the elastic seal 168 , and a ring of buckle flanges 127 are arranged at the first end of the injection head main body 102 , and the buckle flanges 127 are It is configured to be snapped to the second buckle portion 172 , so as to achieve a stable connection between the end cap 167 and the injection head main body 102 .

Referring back to FIGS. 27 and 28 , preferably, the inner sidewall of the end cap 167 is provided with a plurality of guiding ribs 173 extending along the axial direction thereof. The plurality of guide ribs 173 are evenly spaced in the circumferential direction of the end cap 167 . The injection head body 102 is accommodated in an area surrounded by a plurality of guide ribs 173 . This solution can prevent the position of the injection head main body 102 from shifting, and can keep the injection head main body 102 in a proper position all the time. In the illustrated embodiment, the inner side wall of the end cap 167 is provided with four guiding ribs 173 extending along its axial direction. The number of guide ribs 173 .

As shown in FIGS. 27-30 , the end cap 167 is roughly configured as a cylinder, and includes a first cap portion 174 and a second cap portion 175 connected to the first cap portion 174. The cross-sectional diameter of the first cap portion 174 is larger than The diameter of the cross section of the second cap portion 175 , the guide rib 173 is disposed on the first cap portion 174 , and the second buckle portion 172 and the elastic sealing member 168 are disposed on the second cap portion 175 .

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

As shown in Figures 29 and 30, when installing the medicine storage bottle 8, in order to complete the puncture action of puncturing the sealing plug 19 of the medicine storage bottle 8, the operator needs to hold the end cap 167 and turn it toward the direction of the medicine storage bottle 8. Pressing is made against the injector tip body 102 . At this time, the moving distance of the end cap 167 is the axial distance d of the gap mentioned above. During the pressing process, the elastic seal 168 inside the end cap 167 will be squeezed and deformed (as shown in FIG. 30 ), thereby discharging the original enclosed gas inside the sealed space. At this time, the end of the piston 132 will inject micropores 106 is sealed, so the gas in the sealed space can only be discharged from the gap between the elastic seal 168 and the injection head main body 102 to the outside. A certain negative pressure is formed between one end 180 .

As shown in Figure 31, at the moment when the extraction action of the piston assembly 103 starts, the piston assembly 103 produces a slight displacement in the direction away from the injection chamber 107, and the end of the piston 132 leaves the injection microhole 106, releasing the injection microhole 106. seal. The negative pressure formed between the elastic seal 168 and the first end 180 of the injection head body 102 will actively suck the air in the liquid medicine passage inside the piston assembly 103, and guide it to the elastic seal 168 and the first end 180 of the injection head body 102. In the closed space formed between one end 180, the guiding path of air is shown by the arrow in FIG. 31 . Through this design, the gas in the liquid medicine passage inside the piston assembly 103 can be reduced or eliminated, and air bubbles can be avoided when the liquid medicine is sucked into the injection cavity 107 .

As shown in Figure 32, during the process of extracting the liquid medicine, the piston assembly 103 continues to move away from the injection microhole 106. Since the injection microhole 106 is sealed by the elastic seal 168, the gap formed between the injection cavity 107 and the piston 132 Negative pressure will be generated in the space, and the negative pressure will cause the piston 132 to displace or deform in a direction away from the piston rod 160, thereby connecting the first passage and the second passage, and then forming a medicinal liquid passage from the medicine storage bottle 8 to the injection chamber 107 , as shown by the arrow on the right of Figure 32. In addition, as described in the first embodiment, due to the pressure difference between the inside and outside of the medicine storage chamber, the elastic gasket 111 will be deformed, so that the outside air can be filled into the inside of the medicine storage chamber, as shown by the arrow on the left of Figure 32 As shown, this scheme facilitates the extraction of liquid medicine.

As shown in FIG. 33 , the piston assembly 103 moves to a predetermined position, and the extraction of the medical solution is completed. The piston 132 returns to its original shape, so the first passage and the second passage are no longer connected, and the passage of the medicinal liquid from the medicine storage chamber to the injection chamber 107 is blocked. Moreover, as the pressure difference between the inside and outside of the medicine storage chamber decreases, the deformation of the elastic gasket 111 recovers, and the outside air no longer fills into the inside of the medicine storage chamber.

As shown in Figure 34 and Figure 35, during the injection operation, the injection assembly 101 with the end cap 167 removed can be installed on a pushing device (for the sake of brevity, the pushing device is omitted in the figure), and the pushing device drives the piston assembly 103 to The direction of the injection microhole 106 moves, so that the piston 132 can push the medicinal liquid inside the injection chamber 107 to be ejected from the injection microhole 106 at the end of the injection chamber 107 . Squeezed by the liquid medicine inside the injection cavity 107, the piston 132 will be tightly attached to the end of the piston rod 160, reliably sealing the second passage 162 in the piston rod 160, and preventing the liquid medicine from flowing back into the medicine storage chamber.

The matching features such as protrusions, grooves, flanges, and buckles in each matching structure group provided in this embodiment can be structures that extend in the circumferential direction and are intermittently arranged, or can be structures that are arranged intermittently in the circumferential direction. For the continuously arranged structure, some structural adjustments can be made to the injection components accordingly.

In addition, although the embodiment of the present invention is exemplified by a needle-free syringe, the structure of the present invention can also be applied to a needle-equipped syringe.

The foregoing description of various embodiments of the present invention are presented for purposes of illustration to one of ordinary skill in the relevant art. It is not intended that the invention be exclusive or limited to a single disclosed embodiment. As above, many alternatives and modifications to the present invention will be apparent to those skilled in the art of the above teachings. Thus, while a few alternative implementations have been described in detail, other implementations will be apparent or relatively readily developed by those of ordinary skill in the art. The present invention is intended to embrace all alternatives, modifications and variations of the invention described herein, as well as other embodiments that fall within the spirit and scope of the invention described above.

Claims (28)

1. An injection assembly, characterized in that, the injection assembly comprises: The main body of the injection head, the injection cavity is arranged in the main body of the injection head; a piston assembly movably disposed within the injection chamber; and An operating handle, the operating handle is connected to the piston assembly, the operating handle is configured to be able to move relative to the injection head body along the axial direction of the injection head body, and can automatically move to a predetermined position stop moving. 2. The injection assembly of claim 1, wherein the operating handle is detachably connected to the piston assembly. 3. The injection assembly according to claim 1, wherein the operating handle is detachably connected to the injection head body. 4. The injection assembly according to claim 3, characterized in that, the operating handle comprises a housing part and an engaging part arranged inside the housing part, the housing part is configured in a cylindrical shape, and the engaging part is also configured It is cylindrical and arranged concentrically with the shell part, the shell part is sleeved on the outside of the injection head main body, the injection head main body has an opening, and the joint part extends to the injection head through the opening inside the main body and is detachably connected to the piston assembly. 5. The injection assembly according to claim 4, wherein the engaging portion is provided with a buckle structure, the piston assembly includes a piston and a base connected to the piston, and the base is provided with a locking structure that is connected to the snap. The card slot structure matched with the buckle structure. 6. The injection assembly of claim 5, wherein the engagement portion comprises a support portion and a plurality of shafts connected to the support portion and extending from the support portion in a direction towards the piston assembly The support portion is configured as a hollow cylinder, the support portion is connected to the end of the operating handle, the plurality of axially extending rods are spaced apart from each other in the circumferential direction of the joint portion and There is a gap between adjacent axially extending rods, and each axially extending rod includes the buckle structure. 7. The injection assembly according to claim 6, wherein the inner periphery of the opening is provided with a plurality of protrusions corresponding to the number and positions of the plurality of axially extending rods, and the protrusions are It is configured to be able to abut against the axially extending rod at the radially outer side of the axially extending rod when the operating handle drives the piston to move axially. 8. The injection assembly according to claim 4, characterized in that, the injection assembly further comprises a limiting structure configured to limit the operating handle relative to the injection head in a predetermined state. The subject rotates. 9. The injection assembly according to claim 8, characterized in that, the main body of the injection head is provided with a first flange near the opening, and the first flange and the housing part One is provided with a first protrusion, and the other of the first flange part and the shell part is provided with a first groove matching with the first protrusion, and the first protrusion and the The first grooves jointly constitute a set of the limiting structures. 10. The injection assembly according to claim 9, characterized in that the injection assembly comprises two groups of the limiting structures arranged symmetrically with respect to the central axis of the injection head body. 11. The injection assembly according to claim 9, wherein the first groove is provided on the first flange part, the first protrusion is provided on the inner surface of the housing part and Having a predetermined length in the axial direction of the housing portion, the predetermined length of the first protrusion is set so that the first protrusion can remain engaged in the in the first groove, and when the joystick moves to the predetermined position, the first protrusion breaks away from the first groove. 12. The injection assembly according to claim 11, characterized in that, the injection assembly further comprises a stop structure configured to be able to move to the desired position when the operating handle moves relative to the injection head body. Further axial movement of the operating handle relative to the main body of the injection head is restricted when the predetermined position is reached. 13. The injection assembly according to claim 12, wherein a second protrusion is further provided on the housing part, and the injection head main body further comprises a second flange part, and the second flange part is The axial direction of the main body of the injection head is spaced apart from the first flange part, and the second flange part is provided with a stop disc extending a predetermined distance along its circumferential direction, and the stop disc is located on the second flange part. The axial direction of the second flange part is recessed along the direction toward the opening part, the stop plate is configured to block the axial movement of the second protrusion, and the second protrusion and The second stop discs jointly constitute a set of stop structures. 14. The injection assembly according to claim 13, characterized in that, the injection assembly comprises two groups of the stop structures arranged rotationally symmetrically with respect to the central axis of the injection head body. 15. The injection assembly according to claim 13, wherein the second flange part is further provided with a second groove, and the second groove communicates with the recess of the stop plate, the The position of the second groove corresponds to the position of the first groove, and the second groove is configured to be able to cooperate with the first protrusion. 16. The injection assembly of claim 15, wherein the second protrusion is configured to mate with the first groove and the second groove. 17. The injection assembly of claim 13, wherein the second protrusion is spaced apart from the first protrusion both in the axial direction and in the circumferential direction of the housing portion. 18. The injection assembly of claim 17, wherein the shortest axial distance between the first protrusion and the second protrusion is substantially equal to the top surface of the stop disc and the second protrusion. The distance between the bottom surfaces of a flange portion, and/or the circumferential length between the first protrusion and the second protrusion is substantially equal to the circumferential length of the stop disc. 19. The injection assembly according to any one of claims 1-18, further comprising a housing assembly comprising: a case body, the case body has an open end and an engaging end opposite to the open end, the open end is capable of allowing the medicine storage bottle to enter the case body, and the engaging end is engaged with the injection head body; A medicine-taking needle, the medicine-taking needle is arranged inside the shell body, and a medicine-taking channel that can communicate with the outside and the injection cavity is arranged in the medicine-taking needle. 20. The injection assembly according to claim 19, characterized in that, the housing assembly further comprises an elastic gasket, the elastic gasket is arranged in the housing body, and the elastic gasket is larger than the medicine-taking The needle is arranged closer to the main body of the injection head, and the elastic washer is provided with a first through hole communicating with the medicine-taking passage. 21. The injection assembly according to claim 20, wherein an air passage is further provided in the medicine taking needle, and the air passage and the medicine taking passage are set independently of each other. 22. The injection assembly according to claim 21, wherein a second through hole communicating with the air passage is provided on the elastic gasket. 23. The injection assembly according to claim 19, wherein a plurality of barrier ribs are provided on the inner side wall of the housing body, and the plurality of barrier ribs are spaced apart in the circumferential direction of the housing body, The plurality of blocking ribs is configured to abut against the medicine-taking needle from a side of the medicine-taking needle facing the open end when the medicine-taking needle is placed inside the housing body. 24. The injection assembly according to claim 20, wherein the injection head body is provided with injection microholes, the injection microholes are arranged at the first end of the injection head body, and the first end Connected to the joint end of the shell body, the injection microhole communicates with the medicine taking channel through the first through hole. 25. The injection assembly according to claim 24, characterized in that a first buckle portion is provided on the side of the joint end facing the injection microhole, and a ring of buckle flanges is provided on the first end, The locking flange is configured to be able to be locked to the first buckling portion. 26. The injection assembly according to claim 20, wherein a first positioning opening is provided on the joint end, a positioning flange is provided on the elastic gasket, a part of the positioning flange extends to the In the first positioning opening, the first through hole is opened on the positioning flange. 27. An injection system, comprising: The injection assembly according to any one of claims 1-26, one end of the injection head body is provided with injection microholes; and a pushing device, the pushing device includes a housing and a push rod arranged inside the housing, the pushing rod is movably arranged in the housing, at least a part of the injection head body can be engaged in the and the push rod is configured to be able to contact or engage with the piston assembly to push the piston assembly in a direction toward the injection microhole. 28. The injection system of claim 27, wherein the pushing device further comprises a locking mechanism, the housing has an open end, the locking mechanism is disposed at the open end, the lock The locking mechanism is movable between locked and unlocked positions, wherein when the locking mechanism is in the locked position, the locking mechanism forms a first passage path in the open end, and when the locking mechanism is in the unlocked position, the locking mechanism A second passing path through which the injection head main body can pass is formed in the open end, and a cross-sectional area of the first passing path is smaller than a cross-sectional area of the second passing path.

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