Needle-impact-free injection structure

Abstract

The utility model relates to an injection structure without needle impact, which comprises a main body of an injector, an injection piston, an impactor and a guide tube, the injection piston is telescopically mounted in the main body, the rear end of the injection piston is provided with a mounting groove, the front end of the guide tube is pressed against the bottom of the mounting groove, and the impactor is arranged in the mounting groove. The rear end of the guide pipe is fixed inside the main body, the impactor is arranged in the guide pipe, a vent hole is formed in the guide pipe, the vent hole is connected into an air pressure source, the impactor impacts the injection piston to be pushed forwards under the pushing of air input by the air pressure source, and at the moment, the front end of the guide pipe is still contained in a mounting groove. The gas escapes to the outer side of the guide pipe from gaps among the impactor, the guide pipe and the mounting groove, and the injection piston resets and pushes the impactor to move towards the rear end of the guide pipe. According to the needle-free impact injection structure, needle-free injection is completed by impacting the injection piston through the sliding block.

Description

Technical Field

[0001] The utility model relates to the field of needle-free syringes, in particular to a needle-free impact injection structure. Background Art

[0002] Needle-free injection is an injection method without a traditional syringe. It uses pressure to diffuse the drug solution into the user's subcutaneous tissue. Since this injection method is painless and will not cause fear in the user, it is becoming more and more popular. Needle-free syringes have also begun to be widely used in the field of skin beauty. In order to enable needle-free syringes to inject drugs at a high frequency, the existing technology has improved the power structure of needle-free syringes, such as using a pneumatically driven injection piston to inject the drug solution or using an electromagnetically driven injection piston to inject the drug solution. Generally, the piston is directly driven for injection, but the injection effect is often not good, and the injection structure still needs to be improved. Utility Model Content

[0003] The utility model aims to solve the above technical problems and provides a needle-free impact injection structure. The needle-free impact injection structure of the present application completes needle-free injection by a slider impacting an injection piston.

[0004] In order to achieve the above purpose, the technical solutions of the utility model include:

[0005] A needle-free impact injection structure comprises a syringe body, an injection piston, a striker and a guide tube, wherein the injection piston is telescopically mounted inside the body, a mounting groove is provided at the rear end of the injection piston, the front end of the guide tube is pressed against the bottom of the mounting groove, the rear end of the guide tube is fixed inside the body, the striker is arranged in the guide tube, a vent is provided on the guide tube, the vent is connected to an air pressure source, the striker strikes the injection piston forward under the push of gas input from the air pressure source, and at this time the front end of the guide tube is still accommodated in the mounting groove, the gas escapes to the outside of the guide tube through the gap between the striker, the guide tube and the mounting groove, the injection piston is reset and pushes the striker to move toward the rear end of the guide tube.

[0006] According to the needle-free impact injection structure of the present application, the injection function is completed by driving the striker to impact the injection piston through air pressure, which can not only perform high-frequency injection, but also achieve a better injection effect than directly driving the piston for injection. After the injection is completed, the injection piston can be reset, and at the same time, it pushes the striker to move toward the rear end of the guide tube, so that the syringe can perform the next injection. In order to avoid the high-pressure gas that pushes the striker from hindering the resetting of the striker, a gap can be generated between the striker, the guide tube and the mounting groove after the striker and the injection piston collide and generate displacement, for gas to escape from the guide tube.

[0007] Furthermore, the injection piston comprises a piston rod, a spring and a mounting seat, the mounting groove is arranged on the rear side of the mounting seat, the piston rod is mounted on the front end of the mounting seat, and the spring is sleeved on the piston rod.

[0008] Furthermore, a mounting plate is provided inside the main body, a mounting hole is provided in the middle of the mounting plate, the piston rod is sleeved and installed in the mounting hole, one side of the spring presses against the mounting plate, and the other side presses against the mounting seat. The spring will be compressed when the injection piston is impacted, and the elastic force generated by the spring acts on the mounting seat, thereby pushing the entire injection piston and the impactor to reset.

[0009] Furthermore, the invention further comprises a solenoid valve, which is arranged in the main body, and the vent hole of the guide tube is connected to the air pressure source through the solenoid valve. The input and output of the gas can be conveniently controlled by the solenoid valve.

[0010] Furthermore, the gas that escapes to the outside of the guide tube escapes to the outside of the syringe via the solenoid valve.

[0011] Furthermore, an elastic body is provided at the rear end of the guide tube, and the vent hole is provided on the elastic body or on the tube wall of the guide tube in front of the elastic body. The elastic body can provide a limit for the striker and prevent the striker from blocking the vent hole when moving backward.

[0012] Furthermore, the elastomer is a polyurethane elastomer. The polyurethane elastomer has good elasticity and is easy to process, and can be easily processed into a desired shape of the elastomer.

[0013] Furthermore, the main body also includes an injection cavity, in which a first one-way valve is provided, and the injection piston is retracted and retracted to change the pressure in the injection cavity.

[0014] Furthermore, it also includes a liquid medicine storage device, the main body also includes a liquid medicine inlet channel, a second one-way valve is provided in the liquid medicine inlet channel, and the injection cavity is connected to the liquid medicine storage device through the liquid medicine inlet channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a cross-sectional view of the needle-free impact injection structure of the utility model.

[0016] Figure 2 It is a cross-sectional view of the impact state of the needle-free impact injection structure of the utility model.

[0017] Figure 3 for Figure 2 A partial enlarged view of . DETAILED DESCRIPTION

[0018] A needle-free impact injection structure of the utility model is described in conjunction with the accompanying drawings.

[0019] like Figures 1 to 3 The needle-free impact injection structure shown in the figure comprises a syringe body 1, an injection piston 2, a striker 3 and a guide tube 4, wherein the injection piston 2 is telescopically mounted inside the body 1, a mounting groove 231 is provided at the rear end of the injection piston 2, the front end of the guide tube 4 is pressed against the bottom of the mounting groove 231, the rear end of the guide tube 4 is fixed inside the body 1, the striker 3 is arranged in the guide tube 4, a vent hole 42 is provided on the guide tube 4, and the vent hole 42 is connected to an air pressure source, and the air pressure source is an air pump, such as Figures 1 to 3 As shown, the main body 1 is integrally formed into a long tube, the injection piston 2 is installed at the front end of the main body 1, the guide tube 4 is fixed at the rear end of the main body 1, and a vent 7 connected to the air pressure source is provided at the rear of the syringe. Figure 1 As shown, the striker 3 is in the guide tube 4, and the front end of the guide tube 4 is pressed against the bottom of the installation groove 231 of the installation groove 231. Although the installation groove 231 and the front end of the guide tube 4 are not sealed, the relative relationship between the guide tube 4 and the installation groove 231 forms a structure similar to a labyrinth seal, making it difficult for gas to enter the guide tube 4 from the front end of the guide tube 4. When the air pressure source inputs gas into the main body 1, the gas will be preferentially input into the guide tube 4 through the vent 42. The striker 3 is pushed forward by the gas input by the air pressure source and impacts the injection piston 2. Figure 2 As shown, the front end of the guide tube 4 is still accommodated in the mounting groove 231. Figure 3 As shown, the gas escapes from the gap 6 between the striker 3, the guide tube 4 and the mounting groove 231 to the outside of the guide tube 4, and the injection piston 2 is reset and pushes the striker 3 to move toward the rear end of the guide tube 4, restoring the Figure 1 Status shown.

[0020] like Figure 1 As shown, the injection piston 2 includes a piston rod 21, a spring 22 and a mounting seat 23, the mounting groove 231 is arranged on the rear side of the mounting seat 23, the piston rod 21 is installed at the front end of the mounting seat 23, and the spring 22 is sleeved on the piston rod. The injection piston 2 adopts a split structure, which can make the injection piston 2 conveniently installed inside the main body 1, such as the piston rod 21 and the mounting can be conveniently connected by a threaded connection or other structure.

[0021] like Figure 1As shown, a mounting plate 11 is provided inside the main body 1, and a mounting hole is provided in the middle of the mounting plate 11. The piston rod 21 is sleeved and installed in the mounting hole. One side of the spring 22 is pressed against the mounting plate 11, and the other side is pressed against the mounting seat 23. The piston rod 21 and the mounting seat can be conveniently connected by a threaded connection or other structure, so that the injection piston 2 can be conveniently installed on the mounting plate 11. The spring 22 provides a restoring elastic force for the injection piston 2 as a whole. When the injection piston 2 is hit, the spring 22 will be compressed to generate elastic force, and the elastic force will reset the injection piston 2, so that the front end of the guide tube 4 keeps in contact with the bottom of the mounting groove 231, and pushes the striker 3 to move toward the rear end of the guide tube 4.

[0022] It also includes a solenoid valve 5, which is arranged in the main body 1. The air vent 42 of the guide tube 4 is connected to the air pressure source through the solenoid valve 5. The solenoid valve 5 is used to control the input and output of the gas. The control structure formed by the solenoid valve 5 is convenient for the user to operate the syringe.

[0023] like Figure 2 As shown, the gas that escapes to the outside of the guide tube 4 escapes to the outside of the syringe through the solenoid valve 5, and the gas on the rear side of the striker 3 in the guide tube 4 can also be discharged from the main body 1 by the solenoid valve 5 through the vent hole 42, thereby preventing the gas from remaining in the main body 1 and affecting the resetting of the striker 3.

[0024] The rear end of the guide tube 4 is provided with an elastic body 41, and the vent hole 42 is provided on the elastic body 41 or on the tube wall of the guide tube 4 in front of the elastic body 41. The elastic body 41 can provide a limit for the striker 3 and can also prevent the striker 3 from blocking the vent hole 42 when moving backward. The elastic body 41 is a polyurethane elastomer 41, which has good elasticity and easy processing performance, and can be easily processed into the required shape of the elastic body 41.

[0025] like Figure 1 and Figure 2 As shown, the main body 1 also includes an injection chamber 12, in which a first one-way valve 121 is provided, and the injection piston 2 is extended and retracted to change the pressure in the injection chamber 12, and also includes a liquid medicine storage 13. The main body 1 also includes a liquid medicine inlet channel 122, in which a second one-way valve 123 is provided, and the injection chamber 12 is connected to the liquid medicine storage 13 through the liquid medicine inlet channel 122, and the injection of the liquid medicine is completed by the injection chamber 12 and the liquid medicine storage 13 in cooperation with the injection piston 2.

[0026] According to the disclosure and teaching of the above description, the technical personnel in the field to which the utility model belongs can also change and modify the above implementation. Therefore, the utility model is not limited to the specific implementation methods disclosed and described above, and some modifications and changes to the utility model should also fall within the scope of protection of the claims of the utility model. In addition, although some specific terms are used in this specification, these terms are only for the convenience of description and do not constitute any limitation to the utility model.

Claims

1. A needle-free impact injection structure, characterized in that: The invention comprises a syringe body, an injection piston, a striker and a guide tube, wherein the injection piston is telescopically installed inside the body, a mounting groove is provided at the rear end of the injection piston, the front end of the guide tube is pressed against the bottom of the mounting groove, the rear end of the guide tube is fixed inside the body, the striker is arranged in the guide tube, an air vent is provided on the guide tube, the air vent is connected to an air pressure source, the striker strikes the injection piston forward under the push of the gas input from the air pressure source, and at this time the front end of the guide tube is still accommodated in the mounting groove, the gas escapes to the outside of the guide tube through the gap between the striker, the guide tube and the mounting groove, the injection piston is reset and pushes the striker to move toward the rear end of the guide tube.

2. The needle-free impact injection structure according to claim 1, characterized in that: The injection piston comprises a piston rod, a spring and a mounting seat, the mounting groove is arranged at the rear side of the mounting seat, the piston rod is mounted at the front end of the mounting seat, and the spring is sleeved on the piston rod.

3. The needle-free impact injection structure according to claim 2, characterized in that: A mounting plate is provided inside the main body, a mounting hole is provided in the middle of the mounting plate, the piston rod is sleeved and installed in the mounting hole, one side of the spring presses against the mounting plate, and the other side presses against the mounting seat.

4. The needle-free impact injection structure according to claim 1, characterized in that: It also includes a solenoid valve, which is arranged in the main body, and the air vent of the guide tube is connected to the air pressure source through the solenoid valve.

5. The needle-free impact injection structure according to claim 4, characterized in that: The gas that escapes to the outside of the guide tube escapes to the outside of the syringe via the solenoid valve.

6. The needle-free impact injection structure according to claim 1, characterized in that: An elastic body is arranged at the rear end of the guide tube, and the vent hole is arranged on the elastic body or on the tube wall of the guide tube at the front side of the elastic body.

7. The needle-free impact injection structure according to claim 6, characterized in that: The elastomer is a polyurethane elastomer.

8. The needle-free impact injection structure according to claim 1, characterized in that: The main body also includes an injection cavity, in which a first one-way valve is arranged, and the injection piston is extended and retracted to change the pressure in the injection cavity.

9. The needle-free impact injection structure according to claim 8, characterized in that: It also includes a liquid medicine storage device, and the main body also includes a liquid medicine inlet channel, in which a second one-way valve is arranged, and the injection cavity is connected to the liquid medicine storage device through the liquid medicine inlet channel.

Images