Needleless injector

Abstract

The utility model relates to the field of medical equipment, specifically disclose a needleless injector, including liquid pass main body, the liquid pass main body is equipped with main liquid cavity, be equipped with piston in the main liquid cavity, the injection head is equipped with first liquid control valve, the liquid supply mechanism is equipped with second liquid control valve, first liquid control valve includes the first valve cavity of connecting injection head and main liquid cavity, be equipped with first valve core in the first valve cavity, the liquid supply mechanism still includes medicine bottle interface, the piston is connected with power source. Adopt the utility model, can control the area of the liquid ejection section of spout, thereby control the speed of liquid from the injection head spouts.

Description

Technical Field

[0001] This utility model relates to the field of medical devices, and in particular to a needleless injector. Background Technology

[0002] A needle-free injector (also known as a jet injector) is a medical device that uses high pressure to convert medication into a micro-fluid stream, allowing it to directly penetrate the skin and enter subcutaneous tissue. Existing needle-free injectors have one-way valves facing opposite directions at both the injection head and the supply end. When fluid supply is needed, the injection head closes and the supply end opens; when injection is needed, the supply end closes and the injection head opens, switching between supply and injection. The one-way valve in existing injectors consists of a conical orifice, a steel ball located at the orifice, and a return spring. The return spring presses the steel ball against the conical orifice to achieve unidirectional fluid flow. However, this structure cannot control the fluid flow rate, and when the one-way valve closes, the steel ball collides with the conical orifice, easily generating vibration and noise, affecting the operator's precise operation. Utility Model Content

[0003] To address the shortcomings of existing technologies, this invention provides a needleless injector that can control the area of ​​the liquid outlet cross-section, thereby controlling the speed at which liquid is ejected from the injection head.

[0004] To address the aforementioned technical problems, this utility model provides a needle-free injector, comprising a liquid-injecting body with a main liquid chamber and a piston within it. The front end of the main liquid chamber is connected to an injection head, and one side is connected to a liquid supply mechanism. The injection head is equipped with a first liquid control valve, and the liquid supply mechanism is equipped with a second liquid control valve. The first liquid control valve includes a first valve chamber connecting the injection head and the main liquid chamber. A first valve core is located within the first valve chamber. The end of the first valve core facing the main liquid chamber has a first flow channel extending axially from its end face into the first valve core. The first valve core is connected to a radially arranged second flow channel at its end, and the other end of the second flow channel is connected to the side of the first valve core. A first sealing ring is provided on the side of the first valve core, and the first sealing ring is located on the side of the second flow channel away from the main liquid chamber. The first valve core is also provided with an extension column facing the injection nozzle of the injection head, and a first return spring is provided between the first valve core and the injection nozzle. The first valve cavity includes a first chamber and a second chamber that are interconnected. The diameter of the first chamber is smaller than that of the second chamber. When the first sealing ring is located in the first chamber, it can seal the first chamber with the first valve core.

[0005] The liquid supply mechanism also includes a medicine bottle interface. The second liquid control valve is located between the medicine bottle interface and the main liquid chamber, and includes a second valve chamber and a second valve core. A second sealing ring is provided on the side of the second valve core, and a second return spring is provided at the end of the second valve core facing the main liquid chamber.

[0006] The piston is connected to the power source.

[0007] As an improvement to the above solution, the second liquid control valve includes a valve core sleeve, the valve core sleeve having a guide inner wall and a conical orifice, the second valve core having a guide portion that cooperates with the guide inner wall, and a disc portion connected to the guide portion; the guide portion having a third flow channel communicating from its bottom surface to its side surface; a second sealing ring being provided at the connection between the disc portion and the guide portion, the second sealing ring being able to abut against the surface of the conical orifice to seal the valve core sleeve; and a second return spring being provided in the recess of the disc portion.

[0008] As an improvement to the above scheme, a guide cone surface is provided at the connection between the first chamber and the second chamber.

[0009] As an improvement to the above solution, the end of the extension column is provided with a guide flow limiting column, and the end face of the guide flow limiting column is provided with a flow limiting groove.

[0010] As an improvement to the above scheme, the diameter of the guiding and limiting column is smaller than the diameter of the extension column.

[0011] As an improvement to the above solution, the outer diameter of the disc portion is larger than the outer diameter of the guide portion; the valve core sleeve is also provided with a relief cavity, which is located between the inner wall of the guide and the conical opening, and the diameter of the relief cavity is smaller than the diameter of the inner wall of the guide.

[0012] As an improvement to the above solution, the side of the disc body is provided with a flow hole connecting the inner and outer sides of the disc body; the liquid-conducting body is also provided with a liquid supply channel connecting the main liquid chamber and the liquid supply mechanism, and the diameter of the liquid supply channel is smaller than the inner diameter of the disc body.

[0013] As an improvement to the above solution, the needleless injector has two or more injection heads, each injection head being equipped with the first liquid control valve.

[0014] As an improvement to the above solution, the first liquid control valve is connected to the main liquid chamber through a liquid distribution channel.

[0015] As an improvement to the above solution, the liquid distribution channel includes a main liquid distribution channel and a branch liquid distribution channel. One end of the branch liquid distribution channel is connected to the corresponding first liquid control valve, and the other end flows into the main liquid distribution channel. The main liquid distribution channel and the branch liquid distribution channel are arranged perpendicularly. A liquid distribution ball is provided at the confluence point of the main liquid distribution channel and the branch liquid distribution channel. The liquid distribution ball is located in a limiting slide, and a third return spring is provided between the liquid distribution ball and the limiting slide.

[0016] Implementing the embodiments of this utility model has the following beneficial effects:

[0017] The injection head in this embodiment is equipped with a first liquid control valve, which includes a first valve chamber. A first valve core is disposed within the first valve chamber. One end of the first valve core facing the main liquid chamber has a first flow channel extending axially from its end face into the first valve core. The end of the first flow channel is connected to a radially arranged second flow channel, and the other end of the second flow channel communicates with the side of the first valve core. A first sealing ring is disposed on the side of the first valve core, located on the side of the second flow channel away from the main liquid chamber. Liquid pushed in by the piston enters from the end face of the first valve core through the first and second flow channels and flows out from its side. The first flow channel is located at the axis of the first valve core. When liquid flows through the first flow channel, it ensures stable force on the first valve core. Liquid flowing out from the second flow channel flows between the first valve core and the first valve chamber, creating a suspension effect for the first valve core and ensuring smooth and stable movement of the first valve core. The first valve core is also provided with an extension column facing the liquid outlet of the injection head, and a first return spring is also provided between the first valve core and the liquid outlet; the extension column is used to control the stroke of the first valve core, thereby controlling the area of ​​the liquid outlet cross section. By controlling the area of ​​the liquid outlet cross section, the speed at which the liquid is sprayed from the injection head can be controlled to ensure the effect of use.

[0018] The second valve core slides along the inner wall of the valve core sleeve under the limiting action of the guide inner wall. The conical orifice, the disc body, and the guide body form a triangular cross-section area, which can quickly block the flowing liquid. By controlling the flow cross-section of the liquid, the jerking sensation when closing and opening the flow channel can be reduced, improving the operator's operating precision.

[0019] When the piston pushes the liquid in the main liquid chamber at a relatively high speed, the first valve core will move towards the injection head, opening the liquid flow channel of the first valve chamber. The first valve core will then come into contact with the injection nozzle of the injection head. The flow-limiting groove will serve as the only channel for the liquid. By pre-setting the size of the flow-limiting groove, the rated injection volume of the syringe can be controlled, avoiding the impact of the thrust difference of different power sources on the speed of the ejected droplets. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the first embodiment of the needle-free injector of this utility model;

[0021] Figure 2 yes Figure 1 Enlarged view of part A;

[0022] Figure 3 yes Figure 1 Enlarged view of part B;

[0023] Figure 4 This is a schematic diagram of the liquid dispensing state of a needleless injector according to this utility model;

[0024] Figure 5 This is a schematic diagram of the injection state of a needle-free injector according to this utility model;

[0025] Figure 6 This is a schematic diagram of the second embodiment of the needle-free injector of this utility model. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the following will describe this utility model in further detail with reference to the accompanying drawings. It is hereby declared that the terms "up," "down," "left," "right," "front," "back," "inner," and "outer," etc., appearing or about to appear in this document, are based solely on the accompanying drawings and are not intended to specifically limit this utility model.

[0027] like Figures 1-3 As shown, the first embodiment of this utility model provides a needleless injector, including a liquid-injecting body 1. The liquid-injecting body 1 has a main liquid chamber 11, and a piston 12 is provided in the main liquid chamber 11. The front end of the main liquid chamber 11 is connected to a single injection head 2, and one side is connected to a liquid supply mechanism 3. The injection head 2 is provided with a first liquid control valve 4, and the liquid supply mechanism 3 is provided with a second liquid control valve 5. The first liquid control valve 4 includes a first valve chamber 41 connecting the injection head 2 and the main liquid chamber 11. The first valve chamber 41 is provided with a first valve core 42. The end of the first valve core 42 facing the main liquid chamber 11 has a first flow channel 43 extending axially from its end face into the first valve core 42. The end of the first flow channel 43 is connected to a radially arranged second flow channel 5. The second flow channel 44 is connected to the other end of the second flow channel 44, which is connected to the side of the first valve core 42. The side of the first valve core 42 is provided with a first sealing ring 45, which is located on the side of the second flow channel 44 away from the main liquid chamber 11. The first valve core 42 is also provided with an extension post 46 facing the spray nozzle 21 of the injection head 2. A first return spring 47 is also provided between the first valve core 42 and the spray nozzle 21. The first valve chamber 41 includes a first chamber 411 and a second chamber 412 that are connected to each other. The diameter of the first chamber 411 is smaller than that of the second chamber 412. When the first sealing ring 45 is located in the first chamber 411, it can seal the first chamber 411 with the first valve core 42.

[0028] The liquid supply mechanism 3 also includes a medicine bottle interface 31. The second liquid control valve 5 is located between the medicine bottle interface 31 and the main liquid chamber 11, and includes a second valve chamber 51 and a second valve core 52. The second valve core 52 has a second sealing ring 53 on its side and a second return spring 55 at one end of the second valve core 52 facing the main liquid chamber 11. The medicine bottle interface 31 is used to connect to a medicine bottle containing liquids such as medicines.

[0029] The piston 12 is connected to a power source, which may be a pneumatic telescopic device used to drive the piston 12 to move along the main liquid chamber 11.

[0030] The injection head 2 in this embodiment is provided with a first liquid control valve 4. The first liquid control valve 4 includes a first valve chamber 41. A first valve core 42 is provided in the first valve chamber 41. A first flow channel 43 is provided at one end of the first valve core 42 facing the main liquid chamber 11, extending axially from its end face into the first valve core 42. The end of the first flow channel 43 is connected to a radially arranged second flow channel 44. The other end of the second flow channel 44 is connected to the side of the first valve core 42. A first sealing ring 45 is provided on the side of the first valve core 42. The first sealing ring 45 is located on the side of the second flow channel 44 away from the main liquid chamber 11. Liquid pushed in by piston 12 enters through the first flow channel 43 and the second flow channel 44, flows out from the end face of the first valve core 42, and exits from its side. The first flow channel 43 is located at the axis of the first valve core 42. When liquid flows through the first flow channel 43, it ensures that the first valve core 42 is subjected to stable force. Liquid flowing out from the second flow channel 44 flows between the first valve core 42 and the first valve chamber 41, creating a suspension effect for the first valve core 42 and ensuring smooth and stable movement. The first valve core 42 is also provided with an extension column 46 facing the spray nozzle 21 of the injection head 2. A first return spring 47 is also provided between the first valve core 42 and the spray nozzle 21. The extension column 46 is used to control the stroke of the first valve core 42, thereby controlling the area of ​​the liquid outlet cross section of the spray nozzle 21. By controlling the area of ​​the liquid outlet cross section of the spray nozzle 21, the speed at which the liquid is sprayed from the injection head 2 can be controlled, ensuring the effectiveness of use.

[0031] In some embodiments, the second liquid control valve 5 includes a valve core sleeve 54, the valve core sleeve 54 having a guide inner wall 541 and a conical opening 542, the second valve core 52 having a guide portion 521 that cooperates with the guide inner wall 541, and a disc portion 522 connected to the guide portion 521; the guide portion 521 having a third flow channel 56 communicating from its bottom surface to its side surface; a second sealing ring 53 being provided at the connection between the disc portion 522 and the guide portion 521, the second sealing ring 53 being able to abut against the surface of the conical opening 542 to seal the valve core sleeve 54; and a second return spring 55 being provided in the recess of the disc portion 522.

[0032] It should be noted that, unlike existing needle-free injectors, the second liquid control valve 5 in this embodiment has a different structure from the first liquid control valve 4. The second valve core 52 slides along the inner wall of the valve core sleeve 54 under the limiting action of the guide inner wall 541. The conical orifice 542, the disc portion 522, and the guide portion 521 form a triangular cross-section area, which can quickly block the flowing liquid. By controlling the flow cross-section of the liquid, the abruptness when closing and opening the flow channel can be reduced, improving the operator's operational precision.

[0033] Preferably, a guide cone surface 413 is provided at the connection between the first chamber 411 and the second chamber 412. When the first sealing ring 45 moves from the second chamber 412 to the first chamber 411, the guide cone surface 413 can gradually compress the first sealing ring 45 and eventually seal it against the inner wall of the first chamber 411 until the first valve core 42 reaches the stroke limit of the first chamber 411. This structure allows the liquid to gradually decrease in flow rate until it completely stops during the reciprocating cycle of the first valve core 42, avoiding vibration and noise caused by cutting off the liquid during high-speed flow, making the syringe work more smoothly and quietly.

[0034] To control the flow rate and velocity of the ejected liquid and ensure the desired effect of needle-free injection, the end of the extension column 46 is provided with a guide flow-limiting column 461, and the end face of the guide flow-limiting column 461 is provided with a flow-limiting groove 462. When the piston 12 pushes the liquid in the main liquid chamber 11 at a relatively high speed, the first valve core 42 moves towards the injection head 2, opening the liquid flow channel of the first valve chamber 41. The first valve core 42 abuts against the spray port 21 of the injection head 2. The flow-limiting groove 462 serves as the only channel for the liquid. By pre-setting the size of the flow-limiting groove 462, the rated injection volume of the syringe can be controlled, avoiding the influence of the thrust difference of different power sources on the velocity of the ejected droplets.

[0035] More preferably, the diameter of the guide flow-limiting column 461 is smaller than the diameter of the extension column 46. When the liquid flowing through the first valve chamber 41 passes the plane where the spray nozzle 21 is located, it will turn 90 degrees and enter the flow-limiting groove 462. The 90-degree turn of the liquid will generate greater resistance, which may cause intermittent liquid discharge. By making the diameter of the guide flow-limiting column 461 smaller than the diameter of the extension column 46, a space is created at the end of the extension column 46 that is recessed inward. Some liquid fills the space first and then enters the flow-limiting groove 462, providing a sufficient liquid supply to the flow-limiting groove 462.

[0036] In some embodiments, the outer diameter of the disc portion 522 is larger than the outer diameter of the guide portion 521; the valve core sleeve 54 is further provided with a relief cavity 543, which is located between the guide inner wall 541 and the conical opening 542, and the diameter of the relief cavity 543 is smaller than the diameter of the guide inner wall 541.

[0037] The side of the disc portion 522 is provided with a flow hole 523 that connects the inner and outer sides of the disc portion 522; the liquid-conducting body 1 is also provided with a liquid supply channel 6 that connects the main liquid chamber 11 and the liquid supply mechanism 3, and the diameter of the liquid supply channel 6 is smaller than the inner diameter of the disc portion 522.

[0038] The working principle of this needle-free injector is explained in detail below:

[0039] Liquid collection: combination Figure 4 As shown, the power source drives the piston 12 to move backward, the first sealing ring 45 of the first liquid control valve 4 enters the first chamber 411, and the core of the first liquid control valve 4 is in a closed state; the second valve core 52 of the second liquid control valve 5 moves downward under negative pressure, and the medicine in the medicine bottle enters the main liquid chamber 11 through the first liquid control valve 4.

[0040] Injection: Combination Figure 5 As shown, the power source drives the piston 12 to move forward. The second valve core 52 of the second liquid control valve 5 is reset under the pushing action of the second return spring 55 and the liquid. The disc body 522 presses the second sealing ring 53 onto the conical opening 542, closing the second liquid control valve 5 and preventing the liquid from flowing back into the medicine bottle. The first valve core 42 of the first liquid control valve 4 moves to the left under the pushing action of the liquid. The first sealing ring 45 enters the second chamber 412 with a larger diameter, connecting the first valve chamber 41. The medicine enters the gap between the first valve core 42 and the first valve chamber 41 through the first flow channel 43 and the second flow channel 44, and finally flows from the first valve chamber 41 into the spray nozzle 21, and is finally sprayed outward. When the needle-free injector is working normally, the droplets need to be sprayed into the human skin at a high speed. Therefore, when the piston 12 moves to the left at high speed at each pulse moment, the extension column 46 on the first valve core 42 will abut against the spray port 21. After the liquid is released by the first sealing ring 45, the cross-sectional area of ​​the liquid flowing into the spray port 21 is controlled by the flow limiting groove 462, thereby cooperating with the nozzle 22 to precisely control the spray speed of the liquid.

[0041] like Figure 6 As shown, according to the second embodiment of this utility model, the difference from the first embodiment is that the needle-free injector has two or more injection heads 2, and each injection head 2 is correspondingly provided with the first liquid control valve 4. The first liquid control valve 4 is connected to the main liquid chamber 11 through a liquid distribution channel.

[0042] This embodiment possesses the advantages of the first liquid control valve 4 and the second liquid control valve 5 in the first embodiment, and can also perform injection at two points simultaneously, resulting in high injection efficiency.

[0043] Preferably, the liquid distribution channel includes a main distribution channel 71 and a branch distribution channel 72. One end of the branch distribution channel 72 is connected to the corresponding first liquid control valve 4, and the other end flows into the main distribution channel 71. The main distribution channel 71 and the branch distribution channel 72 are arranged perpendicularly. A distribution ball 73 is provided at the confluence point of the main distribution channel 71 and the branch distribution channel 72. The distribution ball 73 is located in a limiting slide 74, and a third return spring 75 is provided between the distribution ball 73 and the limiting slide 74. When the liquid is pushed into the main distribution channel 71 by the piston 12, it needs to push open the distribution ball 73 before entering the branch distribution channel 72. The surface of the distribution ball 73 serves as the liquid diversion surface. The distribution ball 73 controls the opening of the branch distribution channel 72 according to the flow rate to ensure that the flow rate and pressure of the liquid flowing into the branch distribution channel 72 are uniform.

[0044] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications are also considered to be within the protection scope of this utility model.

Claims

1. A needleless injector characterized by, The system includes a liquid-conducting body, which has a main liquid chamber and a piston inside the main liquid chamber. The front end of the main liquid chamber is connected to the injection head, and one side is connected to the liquid supply mechanism; The injection head is provided with a first liquid control valve, and the liquid supply mechanism is provided with a second liquid control valve. The first liquid control valve includes a first valve chamber connecting the injection head and the main liquid chamber. A first valve core is provided in the first valve chamber. One end of the first valve core facing the main liquid chamber is provided with a first flow channel extending axially from its end face into the first valve core. The end of the first flow channel is connected to a radially arranged second flow channel. The other end of the second flow channel is connected to the side of the first valve core. The first valve core is provided with a first sealing ring on its side, and the first sealing ring is located on the side of the second flow channel away from the main liquid chamber; The first valve core is further provided with an extension post facing the injection nozzle of the injection head, and a first return spring is also provided between the first valve core and the injection nozzle; The first valve chamber includes a first chamber and a second chamber that are interconnected. The diameter of the first chamber is smaller than that of the second chamber. When the first sealing ring is located in the first chamber, it can seal the first chamber with the first valve core. The liquid supply mechanism also includes a medicine bottle interface. The second liquid control valve is located between the medicine bottle interface and the main liquid chamber, and includes a second valve chamber and a second valve core. A second sealing ring is provided on the side of the second valve core, and a second return spring is provided at the end of the second valve core facing the main liquid chamber. The piston is connected to the power source.

2. The needle-free injector of claim 1, wherein, The second liquid control valve includes a valve core sleeve, the valve core sleeve having a guide inner wall and a conical orifice, the second valve core having a guide portion that mates with the guide inner wall, and a disc portion connected to the guide portion; The guide portion is provided with a third flow channel that connects its bottom surface to its side surface; a second sealing ring is provided at the connection between the disc body portion and the guide portion, and the second sealing ring can abut against the surface of the conical opening to seal the valve core sleeve; The second reset spring is located in the recess of the disc body.

3. The needle-free injector of claim 1, wherein, A guide cone surface is provided at the connection between the first chamber and the second chamber.

4. The needle-free injector of claim 1, wherein, The end of the extension column is provided with a guide flow limiting column, and the end face of the guide flow limiting column is provided with a flow limiting groove.

5. The needle-free injector of claim 4, wherein, The diameter of the guiding and limiting column is smaller than the diameter of the extension column.

6. The needle-free injector of claim 2, wherein, The outer diameter of the disc portion is larger than the outer diameter of the guide portion; the valve core sleeve is also provided with a relief cavity, which is located between the inner wall of the guide and the conical opening, and the diameter of the relief cavity is smaller than the diameter of the inner wall of the guide.

7. The needle-free injector of claim 6, wherein, The side of the disc body is provided with a flow hole connecting the inner and outer sides of the disc body; the liquid-conducting body is also provided with a liquid supply channel connecting the main liquid chamber and the liquid supply mechanism, and the diameter of the liquid supply channel is smaller than the inner diameter of the disc body.

8. The needle-free injector of any one of claims 1-7, wherein, The needleless injector has two or more injection heads, and each injection head is equipped with the first liquid control valve.

9. The needle-free injector of claim 8, wherein, The first liquid control valve is connected to the main liquid chamber through a liquid distribution channel.

10. The needle-free injector of claim 9, wherein, The liquid distribution channel includes a main liquid distribution channel and a branch liquid distribution channel. One end of the branch liquid distribution channel is connected to the corresponding first liquid control valve, and the other end flows into the main liquid distribution channel. The main liquid distribution channel and the branch liquid distribution channel are arranged perpendicularly. A liquid distribution ball is provided at the confluence point of the main liquid distribution channel and the branch liquid distribution channel. The liquid distribution ball is located in a limiting slide, and a third return spring is provided between the liquid distribution ball and the limiting slide.

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