Injector and injection structure thereof

Abstract

The injection structure comprises an external structure and an injection push rod, a medicine cavity is formed in the external structure, and a medicine outlet is formed in the front end of the medicine cavity; the injection push rod is inserted into the medicine cavity in the front-back direction so that an injection cavity can be formed in the front end of the medicine cavity, and a liquid outlet groove cavity communicating with the outside is formed in the cavity wall, on the rear side of the injection cavity, of the medicine cavity. The injection push rod is provided with a medicine guide channel; one end of the medicine guide channel forms a medicine outlet opening at the front end of the injection push rod so as to be communicated with the injection cavity; when the injection push rod is located at the medicine pumping position, the medicine inlet is located at the position of the liquid outlet groove cavity to be communicated, and when the injection push rod moves forwards by a preset distance from the medicine pumping position to enter the injection position, the medicine inlet is blocked by the wall of the medicine cavity. The injection structure of the injector can effectively solve the problem that a medicine inlet and outlet system of an existing injection structure is complex. The utility model further discloses an injector comprising the injection structure.

Description

Technical Field

[0001] The utility model relates to the technical field of injection equipment, and more specifically, to an injection structure of a syringe, and also to a syringe comprising the injection structure. Background Art

[0002] Needle-free injection is a new injection technology that achieves the purpose of drug injection without needle puncture. It has the advantages of reducing the pain and fear of drug injection, reducing the risk of bacterial infection, avoiding accidents such as needle scratches and breakage, rapid drug absorption, no subcutaneous nodules after long-term use, and high injection efficiency.

[0003] In current syringes, the drug outlet and the drug inlet are connected through the injection cavity, and a check valve is provided at the drug inlet, so that when the injection push rod pushes and compresses the injection cavity, the drug liquid in the injection cavity will not flow out from the drug inlet, but only from the drug outlet. However, the provision of a check valve will result in a relatively high structural cost.

[0004] In summary, how to effectively solve the complex problem of the current injection structure drug inlet and outlet system is a problem that technicians in this field urgently need to solve. Utility Model Content

[0005] In view of this, the first object of the utility model is to provide an injection structure of a syringe, which can effectively solve the problem of complex drug inlet and outlet systems of current injection structures. The second object of the utility model is to provide a syringe including the above-mentioned injection structure.

[0006] In order to achieve the above first purpose, the utility model provides the following technical solutions:

[0007] An injection structure of a syringe comprises an external structure and an injection push rod, wherein a medicine cavity is arranged in the external structure, and a medicine outlet is provided at the front end of the medicine cavity; the injection push rod is inserted into the medicine cavity along the front-to-back direction so that an injection cavity is formed at the front end of the medicine cavity, and a liquid outlet groove cavity connected to the outside is formed on the cavity wall on the rear side of the injection cavity; the injection push rod is provided with a medicine guiding channel; one end of the medicine guiding channel forms a medicine outlet opening at the front end of the injection push rod to connect to the injection cavity; the other end of the medicine guiding channel forms a medicine inlet opening at the side of the injection push rod, and when the injection push rod is located at the medicine extraction position, the medicine inlet opening is located at the liquid outlet groove cavity to connect, and when the injection push rod moves forward a predetermined distance from the medicine extraction position to enter the injection position, the medicine inlet opening is blocked by the cavity wall of the medicine cavity.

[0008] In the injection structure of the above-mentioned syringe, the injection push rod can be moved to the medicine extraction position to complete the rehydration of the injection cavity. When the injection push rod moves forward to the injection position, the medicine inlet opening is blocked by the wall of the medicine cavity. When the injection push rod continues to move forward, the injection cavity becomes smaller, and the medicine outlet can be used to discharge medicine to complete the injection. In the injection structure of the above-mentioned syringe, when the medicine inlet opening is aligned with the liquid outlet groove cavity, the medicine liquid in the liquid outlet groove cavity at the rear wall of the medicine cavity is introduced into the injection cavity through the liquid guide channel inside the injection push rod. The injection push rod is moved to make the medicine inlet opening and the liquid outlet groove cavity misaligned to complete the segmentation, which can meet the injection requirements. Therefore, there is no need to use a valve alone, but it is achieved through the cooperation between structures, which effectively reduces costs. In summary, the injection structure of the syringe can effectively solve the problem of the complexity of the current injection structure's drug inlet and outlet system.

[0009] In some technical schemes, the liquid outlet cavity is an annular groove body, and the drug guiding channel includes an axial channel extending axially and having the drug outlet opening at the front end and multiple radial channels extending radially and having the drug inlet opening at the radial outer ends, and the multiple radial channels are evenly arranged around the axial channel.

[0010] In some technical solutions, the liquid outlet groove cavity has a pan seal on both sides in the front-to-back direction, sealing between the medicine cavity and the injection push rod.

[0011] In some technical schemes, the external structure includes a front end shell, a sealing body and a rear end cover, the front end shell and the sealing body both have a central hole to respectively form a partial cavity of the medicine cavity, the liquid outlet groove cavity is arranged inside the central hole of the sealing body, and the rear end cover and the front end shell are fixedly connected to fix the sealing body.

[0012] In some technical solutions, solid sealing rings are provided at both ends of the sealing body in the front-to-back direction, and the inner hole of the solid sealing ring is slidably matched with the injection push rod.

[0013] In some technical schemes, the front end shell has an assembly hole mounted on the sealing body, the outer periphery of the sealing body forms a liquid guide groove cavity, the front end shell is provided with an external liquid guide channel which passes through the inside and outside and the inner end corresponds to the liquid guide groove cavity; the sealing body is provided with an internal liquid guide channel, and the internal liquid guide channel is connected between the liquid guide groove cavity and the liquid outlet groove cavity.

[0014] In some technical solutions, the liquid guiding groove cavity is an annular groove, and a plurality of the internal liquid guiding channels are evenly arranged around the injection push rod and are all connected to the liquid guiding groove cavity.

[0015] In some technical solutions, the plurality of inner liquid-conducting channels are arranged in one-to-one correspondence with the plurality of radial channels.

[0016] In some technical solutions, radial outer edges on both sides of the sealing body are recessed to accommodate a sealing ring that abuts against the wall of the assembly hole.

[0017] In order to achieve the second objective, the utility model also provides a syringe, which comprises any one of the above injection structures, and a pushing device, wherein the rear end of the injection push rod of the injection structure is connected to the pushing end of the pushing device. Since the above injection structure has the above technical effects, the syringe having the injection structure should also have corresponding technical effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 A schematic cross-sectional structure diagram of a syringe provided in an embodiment of the utility model;

[0020] Figure 2 A schematic structural diagram of an injection push rod provided in an embodiment of the utility model.

[0021] The following are marked in the accompanying drawings:

[0022] Injection push rod 1, drug outlet 2, injection cavity 3, liquid outlet groove cavity 4, drug guiding channel 5, axial channel 6, radial channel 7, pan-plug seal 8, front end shell 9, sealing body 10, rear end cover 11, solid sealing ring 12, liquid guiding groove cavity 13, inner liquid guiding channel 14, and pushing device 15. DETAILED DESCRIPTION

[0023] The embodiment of the utility model discloses an injection structure of a syringe, which effectively solves the problem of complicated medicine inlet and outlet system of the current injection structure.

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] See also Figure 1-Figure 2 , Figure 1 A schematic cross-sectional structure diagram of a syringe provided in an embodiment of the utility model; Figure 2A schematic structural diagram of an injection push rod provided in an embodiment of the utility model.

[0026] In some embodiments, this embodiment provides an injection structure of a syringe, where the syringe is mainly a needle-free syringe, but can also be other syringes. Specifically, the injection structure includes an external structure and an injection push rod 1.

[0027] The external structure is provided with a medicine cavity, and a medicine outlet 2 is provided at the front end of the medicine cavity. The injection push rod 1 is inserted into the medicine cavity along the front-to-back direction, so that the front end of the medicine cavity forms an injection cavity 3, and the injection cavity 3 is located at the front end of the injection push rod 1. The injection push rod 1 moves in the front-to-back direction relative to the external structure, so that the injection cavity 3 is enlarged or reduced. Specifically, when the injection push rod 1 moves forward relative to the external structure, the injection cavity 3 becomes smaller and the internal medicine liquid is pushed out; and when it moves backward, the injection cavity 3 becomes larger, and the external medicine liquid enters the injection cavity 3 accordingly.

[0028] The medicine cavity forms a liquid outlet cavity 4 on the cavity wall at the rear side of the injection cavity 3, which is connected to the outside, so that liquid can be supplied from the outside to the liquid outlet cavity 4. The injection push rod 1 is provided with a drug guide channel 5, one end of which forms a drug outlet opening at the front end of the injection push rod 1 to connect to the injection cavity 3, and the other end is used to connect to the liquid outlet cavity 4, so that the liquid in the liquid outlet cavity 4 can be supplied to the injection cavity 3 through the drug guide channel 5, so that the injection cavity 3 is replenished with liquid.

[0029] Specifically, the other end of the drug guiding channel 5 forms a drug inlet opening on the side of the injection push rod 1, and when the injection push rod 1 moves relative to the external structure to be located at the drug extraction position, the above-mentioned drug inlet opening is located at the liquid outlet groove cavity 4 to be connected, that is, when the injection push rod 1 is located at the drug extraction position, the drug inlet opening is located at the liquid outlet groove cavity 4 to be connected with the liquid outlet groove cavity 4. At this time, the medicine in the liquid outlet groove cavity 4 can enter the drug guiding channel 5 through the drug inlet opening, and then enter the injection cavity.

[0030] When the injection push rod 1 moves forward a predetermined distance from the medicine extraction position relative to the external structure to enter the injection position, the medicine inlet opening is blocked by the wall of the medicine cavity to block the outlet groove cavity 4. At this time, the liquid medicine in the outlet groove cavity 4 cannot enter the injection cavity 3 through the medicine guide channel 5. At this time, the injection push rod 1 continues to move forward, and the injection cavity 3 can be squeezed so that the liquid in the injection cavity 3 flows out from the medicine outlet 2 to complete the injection. After the injection is completed, the injection push rod 1 moves backward until it enters the medicine extraction position. Before entering the medicine extraction position, the injection cavity 3 shows a tendency to expand. At this time, the injection cavity 3 can be supplemented with air or not. When air is not supplemented, the interior presents a negative pressure state. When entering the medicine extraction position, because the medicine inlet opening is located at the outlet groove cavity 4, the liquid medicine in the outlet groove cavity 4 can enter the injection cavity 3 through the medicine guide channel 5 to complete the fluid replenishment.

[0031] In the injection structure of the above-mentioned syringe, the injection push rod 1 can be moved to the medicine extraction position to complete the rehydration of the injection chamber 3. When the injection push rod 1 moves forward to the injection position, the medicine inlet opening is blocked by the wall of the medicine chamber. When the injection push rod 1 continues to move forward, the injection chamber 3 becomes smaller, and the medicine outlet 2 can be used to discharge medicine to complete the injection. In the injection structure of the above-mentioned syringe, when the medicine inlet opening is aligned with the liquid outlet groove cavity 4, the medicine liquid in the liquid outlet groove cavity 4 at the rear wall of the medicine chamber is introduced into the injection chamber 3 through the liquid guide channel inside the injection push rod 1. By moving the injection push rod 1, the medicine inlet opening and the liquid outlet groove cavity 4 are misaligned to complete the segmentation, which can meet the injection requirements. Therefore, there is no need to use a valve alone, but it is achieved through the cooperation between structures, which effectively reduces the cost. In summary, the injection structure of the syringe can effectively solve the problem of the complex drug inlet and outlet system of the current injection structure.

[0032] In some embodiments, the drug guiding channel 5 may be L-shaped; or the drug guiding channel 5 may be linear and inclined to extend linearly from the front end surface of the injection push rod 1 to the side surface.

[0033] In order to facilitate the molding of the above-mentioned drug guiding channel 5 on the injection push rod 1, it is generally drilled. At the same time, in order to ensure smooth drug guiding. Here, the preferred liquid outlet groove cavity 4 is an annular groove body, and the above-mentioned drug guiding channel 5 includes an axial channel 6 and a radial channel 7. Wherein the axial channel 6 extends axially and has a drug outlet opening at the front end, the radial channel 7 extends radially and has a drug inlet opening at the radial outer end, and the radial inner end of the radial channel 7 is connected with the axial channel 6, which can be connected with the middle or rear end of the axial channel 6. A plurality of radial channels 7 are evenly arranged around the axial channel 6, and are all connected with the axial channel 6, so that liquid can be introduced from the liquid outlet groove cavity 4 into the axial channel 6, and the liquid guiding speed can be improved. And during manufacturing, the above-mentioned axial channel 6 and radial channel 7 can be realized by drilling.

[0034] In some embodiments, considering that the two sides of the liquid outlet groove cavity 4 in the front-to-back direction need to be sealed with the injection push rod 1 to avoid leakage, it is preferred that the liquid outlet groove cavity 4 has a pan seal 8 on both sides in the front-to-back direction to seal between the medicine cavity and the injection push rod 1.

[0035] In some embodiments, in order to facilitate molding, the external structure may specifically include a front end shell 9, a sealing body 10 and a rear end cover 11. The front end shell 9 and the sealing body 10 both have a central hole to form a partial cavity of the medicine cavity, respectively. The central hole portion of the front end shell 9 is mainly a partial cavity of the injection cavity 3. At this time, a liquid outlet groove cavity 4 may be provided inside the central hole of the sealing body 10. The rear end cover 11 and the front end shell 9 are fixedly connected to fix the sealing body 10. Through the split setting, the above-mentioned liquid outlet groove cavity 4 can be conveniently arranged. Furthermore, the sealing body 10 may be provided with grooves on both sides of the front and rear directions of the liquid outlet groove cavity 4 to respectively accommodate the above-mentioned pan-plug seal 8.

[0036] In some embodiments, in order to better seal the body 10, solid sealing rings 12 are provided at both ends in the front-to-back direction, and the inner hole of the solid sealing ring 12 is slidably matched with the injection push rod 1. Specifically, the solid sealing ring 12 at one end abuts between the front housing 9 and the sealing body 10, and the solid sealing ring 12 at the other end abuts between the rear end cover 11 and the sealing body 10.

[0037] In some embodiments, the front end housing 9 may have an assembly hole sleeved on the sealing body 10, that is, the rear end of the front end housing 9 may also have a cylindrical shell portion extending to the sealing body 10, and the inner cavity of the cylindrical shell portion is the assembly hole. Further, the outer periphery of the sealing body 10 may form a liquid guide groove cavity 13, and the front end housing 9 may be provided with an external liquid guide channel that is connected inside and outside and whose inner end corresponds to the liquid guide groove cavity 13, so that the external liquid guide channel can introduce liquid medicine into the liquid guide groove cavity 13.

[0038] The sealing body 10 is provided with an internal liquid conducting channel 14, which is connected between the liquid conducting groove cavity 13 and the liquid outlet groove cavity 4, so that the external liquid can enter the liquid conducting groove cavity 13 through the external liquid conducting channel, and then enter the liquid outlet groove cavity 4 through the internal liquid conducting channel 14.

[0039] In some embodiments, in order to facilitate the introduction of the drug solution into the liquid outlet groove cavity 4 as quickly as possible, it is preferred that the liquid guide groove cavity 13 is also an annular groove, and multiple internal liquid guide channels 14 are evenly arranged around the injection push rod 1 and are all connected to the liquid guide groove cavity 13.

[0040] Furthermore, the plurality of inner liquid guiding channels 14 may be arranged in one-to-one correspondence with the plurality of radial channels 7 so that the liquid medicine introduced by the inner liquid guiding channels 14 can enter the corresponding radial channels 7 as quickly as possible, thereby better improving the liquid guiding speed.

[0041] In some embodiments, the radial outer edges of the front and rear sides of the sealing body 10 can be recessed to accommodate the sealing ring that abuts against the wall of the assembly hole.

[0042] Specifically, during installation, the solid sealing ring 12 at one end is installed first, then the sealing body 10 is installed, then the solid sealing ring 12 at the other end is installed, and finally the rear end cover 11 is installed. The rear end cover 11 and the front end shell 9 can be connected by screws.

[0043] Based on the injection structure provided in the above embodiments, the utility model further provides a syringe, which includes any one of the injection structures in the above embodiments, including a pushing device 15, and the rear end of the injection push rod 1 of the injection structure is connected to the pushing end of the pushing device 15. Since the syringe adopts the injection structure in the above embodiments, please refer to the above embodiments for the beneficial effects of the syringe.

[0044] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0045] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An injection structure of a syringe, comprising an external structure and an injection push rod, wherein a medicine cavity is provided in the external structure, and a front end of the medicine cavity has a medicine outlet; characterized in that: The injection push rod is inserted into the medicine cavity along the front-to-back direction so that an injection cavity is formed at the front end of the medicine cavity, and a liquid outlet groove cavity connected to the outside is formed on the cavity wall on the rear side of the injection cavity; the injection push rod is provided with a drug guiding channel; one end of the drug guiding channel forms a drug outlet opening at the front end of the injection push rod to connect to the injection cavity; the other end of the drug guiding channel forms a drug inlet opening on the side of the injection push rod, and when the injection push rod is located at the drug extraction position, the drug inlet opening is located at the liquid outlet groove cavity to connect, and when the injection push rod moves forward a predetermined distance from the drug extraction position to enter the injection position, the drug inlet opening is blocked by the cavity wall of the medicine cavity.

2. The injection structure according to claim 1, characterized in that: The liquid outlet groove cavity is an annular groove body, and the drug guiding channel includes an axial channel extending axially and having the drug outlet opening at the front end and multiple radial channels extending radially and having the drug inlet openings at the radial outer ends, and the multiple radial channels are evenly arranged around the axial channel.

3. The injection structure according to claim 2, characterized in that: The liquid outlet groove cavity has a pan seal on both sides in the front-to-back direction, sealing between the medicine cavity and the injection push rod.

4. The injection structure according to claim 3, characterized in that: The external structure includes a front end shell, a sealing body and a rear end cover. The front end shell and the sealing body both have a central hole to respectively form a partial cavity of the medicine cavity. The liquid outlet groove cavity is arranged inside the central hole of the sealing body. The rear end cover is fixedly connected to the front end shell to fix the sealing body.

5. The injection structure according to claim 4, characterized in that: The sealing body is provided with solid sealing rings at both ends in the front-rear direction, and the inner hole of the solid sealing ring is slidably matched with the injection push rod.

6. The injection structure according to claim 5, characterized in that: The front end shell has an assembly hole sleeved on the sealing body, the outer periphery of the sealing body forms a liquid guide groove cavity, the front end shell is provided with an external liquid guide channel which passes through the inside and outside and the inner end corresponds to the liquid guide groove cavity; the sealing body is provided with an internal liquid guide channel, and the internal liquid guide channel is connected between the liquid guide groove cavity and the liquid outlet groove cavity.

7. The injection structure according to claim 6, characterized in that: The liquid guiding groove cavity is an annular groove, and a plurality of internal liquid guiding channels are evenly arranged around the injection push rod and are all connected to the liquid guiding groove cavity.

8. The injection structure according to claim 7, characterized in that: The plurality of inner liquid-conducting channels are arranged in one-to-one correspondence with the plurality of radial channels.

9. The injection structure according to claim 8, characterized in that: The radial outer edges of the front and rear sides of the sealing body are recessed to accommodate a sealing ring that abuts against the wall of the assembly hole.

10. A syringe comprising a pushing device, characterized in that: It also includes the injection structure according to any one of claims 1 to 9, wherein the rear end of the injection push rod of the injection structure is connected to the pushing end of the pushing device.

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