Needleless injector

Abstract

The invention relates to the field of medical equipment, and particularly discloses a needleless injector which comprises a liquid passing main body, a main liquid cavity is formed in the liquid passing main body, and a piston is arranged in the main liquid cavity; the injection head is provided with a first liquid control valve, the liquid supply mechanism is provided with a second liquid control valve, the first liquid control valve comprises a first valve cavity connected with the injection head and the main liquid cavity, a first valve element is arranged in the first valve cavity, and the liquid supply mechanism further comprises a medicine bottle connector. And the piston is connected with a power source. According to the invention, the area of the liquid outlet cross section of the liquid spraying opening can be controlled, so that the speed of liquid sprayed out of the injection head is controlled.

Description

Technical Field

[0001] The present invention relates to the field of medical equipment, and in particular to a needle-free syringe. Background Art

[0002] A needle-free syringe (also known as a jet syringe) is a medical device that uses high pressure to convert drugs into fine liquid streams that directly penetrate the skin and enter the subcutaneous tissue. Existing needle-free syringes are equipped with one-way valves facing opposite directions on the injection head and the liquid supply end. When liquid supply is required, the injection head is closed and the liquid supply end is opened; when injection is required, the liquid supply end is closed and the injection head is opened to switch between liquid supply and injection. The one-way valve used in existing syringes consists of a conical mouth, a steel ball provided at the conical mouth, and a return spring. The return spring presses the steel ball on the conical mouth to achieve one-way flow of the liquid. However, the above structure cannot control the flow rate of the liquid, and when the one-way valve is closed, the steel ball collides with the conical mouth, which is prone to vibration and noise, affecting the operator's delicate operation. Summary of the Invention

[0003] In order to solve the defects of the prior art, the present invention provides a needle-free syringe, which can control the area of ​​the liquid outlet cross section of the liquid injection port, thereby controlling the speed at which the liquid is ejected from the injection head.

[0004] In order to solve the above technical problems, an embodiment of the present invention provides a needle-free syringe, including a liquid-passing body, wherein a main liquid chamber is provided in the liquid-passing body, and a piston is provided in 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, and the end of the first valve core facing the main liquid chamber is provided with a first flow channel extending axially from its end face to the first valve core, and the end of the first flow channel is provided with a first valve core. The first valve core has a first end connected to a radially arranged second flow channel, 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 liquid spray port of the injection head, and a first return spring is further provided between the first valve core and the liquid spray port; 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, and when the first sealing ring is located in the first chamber, it can seal the first chamber and the first valve core;

[0005] The liquid supply mechanism further includes a medicine bottle interface, the second liquid control valve is provided 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 on the end of the second valve core facing the main liquid chamber;

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

[0007] As an improvement of the above-mentioned scheme, the second liquid control valve includes a valve core sleeve, which is provided with a guide inner wall and a tapered mouth, and the second valve core is provided with a guide portion cooperating with the guide inner wall, and a disc body connected to the guide portion; the guide portion is provided with a third flow channel connected from its bottom surface to the side surface; a second sealing ring is provided at the connection between the disc body and the guide portion, and the second sealing ring can abut against the surface of the tapered mouth to seal the valve core sleeve; the second return spring is provided in the recessed part of the disc body.

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

[0009] As an improvement to the above solution, a guiding current-limiting column is provided at the end of the extension column, and a current-limiting groove is provided on the end face of the guiding current-limiting column.

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

[0011] As an improvement of the above solution, the outer diameter of the disc body is larger than the outer diameter of the guide part; the valve core sleeve is also provided with an avoidance cavity, which is arranged between the guide inner wall and the tapered mouth, and the diameter of the avoidance cavity is smaller than the diameter of the guide inner wall.

[0012] As an improvement to the above solution, the side of the disc body is provided with a flow hole connecting the inside and outside of the disc body; the liquid-passing body is also provided with a liquid supply channel connecting the main liquid cavity 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 of the above solution, the needle-free syringe has more than two injection heads, and each injection head is correspondingly provided with the first liquid control valve.

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

[0015] As an improvement of the above-mentioned scheme, the liquid separation channel includes a main liquid separation channel and a branch liquid separation channel, one end of the branch liquid separation channel is connected to the corresponding first liquid control valve, and the other end merges into the main liquid separation channel; the main liquid separation channel and the branch liquid separation channel are arranged vertically; a liquid separation ball is provided at the converging point of the main liquid separation channel and the branch liquid separation channel, the liquid separation ball is provided in a limiting slide, and a third reset spring is provided between the liquid separation ball and the limiting slide.

[0016] The implementation of the embodiments of the present invention has the following beneficial effects:

[0017] The injection head of this embodiment is provided with a first liquid control valve, which includes a first valve cavity, a first valve core provided in the first valve cavity, a first flow channel extending axially from its end face into the first valve core at one end of the first valve core facing the main liquid cavity, 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 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 cavity. The liquid pushed in by the piston enters from the end face of the first valve core and flows out from its side through the first flow channel and the second flow channel. The first flow channel is located at the axis of the first valve core. When the liquid flows through the first flow channel, it can ensure that the force on the first valve core is stable. The liquid flowing out of the second flow channel flows between the first valve core and the first valve cavity, so that the first valve core forms a suspension effect, ensuring that the movement of the first valve core is stable and smooth. The first valve core is also provided with an extension column facing the liquid spray port of the injection head, and a first return spring is also provided between the first valve core and the liquid spray port; the extension column is used to control the stroke of the first valve core, thereby controlling the area of ​​the liquid outlet cross-section of the liquid spray port. By controlling the area of ​​the liquid outlet cross-section of the liquid spray port, the speed at which the liquid is sprayed from the injection head can be controlled to ensure the use effect.

[0018] The second valve core slides along the inner wall of the valve core sleeve under the restraining action of the guide inner wall. The tapered opening, disc portion, and guide portion enclose a triangular cross-section area, which can quickly block the flow of liquid. By controlling the liquid flow cross-section, the sense of frustration 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 higher speed, the first valve core will move toward the injection head, so that the liquid flow channel of the first valve chamber is opened, and the first valve core abuts against the liquid spray port of the injection head. The flow limiting groove will serve as the only channel for the liquid. By setting the size of the flow limiting groove in advance, the rated injection volume of the syringe can be controlled to avoid the speed of the sprayed droplets being affected by the thrust difference of different power sources. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic structural diagram of a first embodiment of a needle-free syringe according to the present invention;

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

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

[0023] Figure 4 This is a schematic diagram of a needle-free syringe in the liquid collection state of the present invention;

[0024] Figure 5 This is a schematic diagram of an injection state of a needle-free syringe of the present invention;

[0025] Figure 6 It is a structural schematic diagram of a second embodiment of a needle-free syringe of the present invention. DETAILED DESCRIPTION

[0026] To make the objectives, technical solutions, and advantages of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings. It is hereby stated that any directional terms such as "up," "down," "left," "right," "front," "back," "inside," and "outside" that appear or will appear herein are based solely on the accompanying drawings and are not intended to limit the present invention.

[0027] like Figure 1-Figure 3 As shown, the first embodiment of the present invention provides a needle-free syringe, including a liquid-passing body 1, wherein a main liquid chamber 11 is provided in the liquid-passing body 1, 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, a first valve core 42 is provided in the first valve chamber 41, and the end of the first valve core 42 facing the main liquid chamber 11 is provided with a first flow channel 43 extending axially from its end face to the first valve core 42, and the end of the first flow channel 43 is connected to the second flow channel 43 arranged radially 44 is connected, and 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, and the first sealing ring 45 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 column 46 facing the liquid spraying port 21 of the injection head 2, and a first return spring 47 is further provided between the first valve core 42 and the liquid spraying port 21; the first valve chamber 41 includes a first chamber 411 and a second chamber 412 that are interconnected, and 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 and the first valve core 42;

[0028] The liquid supply mechanism 3 also includes a medicine bottle interface 31, and the second liquid control valve 5 is arranged between the medicine bottle interface 31 and the main liquid chamber 11, including a second valve chamber 51 and a second valve core 52. A second sealing ring 53 is provided on the side of the second valve core 52, and a second return spring 55 is provided on the 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 filled with liquids such as medicines.

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

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

[0031] In some embodiments, the second liquid control valve 5 includes a valve core sleeve 54, which is provided with a guide inner wall 541 and a tapered mouth 542, and the second valve core 52 is provided with a guide portion 521 cooperating with the guide inner wall 541, and a disc body 522 connected to the guide portion 521; the guide portion 521 is provided with a third flow channel 56 connected from its bottom surface to the side surface; a second sealing ring 53 is provided at the connection between the disc body 522 and the guide portion 521, and the second sealing ring 53 can abut against the surface of the tapered mouth 542 to seal the valve core sleeve 54; the second return spring 55 is provided in the recessed part of the disc body 522.

[0032] It should be noted that, unlike existing needle-free syringes, the second liquid control valve 5 of 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, limited by the guide inner wall 541. The tapered opening 542, the disc portion 522, and the guide portion 521 form a triangular cross-section that quickly blocks the flow of liquid. By controlling the liquid flow area, the sense of frustration during closing and opening the flow channel is reduced, improving operator precision.

[0033] Preferably, a guide cone 413 is provided at the connection between the first chamber 411 and the second chamber 412. As the first sealing ring 45 moves from the second chamber 412 toward the first chamber 411, the guide cone 413 gradually compresses the first sealing ring 45, ultimately sealing it against the inner wall of the first chamber 411 until the first valve core 42 reaches the travel limit of the first chamber 411. This structure allows the liquid flow rate to gradually decrease to a complete stop during the reciprocating cycle of the first valve core 42, avoiding vibration and noise caused by interruption of high-speed liquid flow, and ensuring smoother and quieter operation of the syringe.

[0034] To control the flow rate and velocity of the ejected liquid and ensure the desired needle-free injection effect, a guide flow-limiting column 461 is provided at the end of the extension column 46, and a flow-limiting groove 462 is provided on the end surface of the guide flow-limiting column 461. When the piston 12 pushes the liquid in the main liquid chamber 11 at a relatively high speed, the first valve core 42 moves toward the injection head 2, opening the liquid flow channel in the first valve chamber 41. The first valve core 42 abuts the liquid injection port 21 of the injection head 2, and the flow-limiting groove 462 serves as the sole 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, preventing the velocity of the ejected droplets from being affected by the thrust differences of different power sources.

[0035] Preferably, the diameter of the guide flow-limiting post 461 is smaller than the diameter of the extension post 46. Liquid flowing through the first valve chamber 41 makes a 90-degree turn when passing through the plane of the liquid ejection port 21 and enters the flow-limiting groove 462. This 90-degree turn creates significant resistance, potentially causing intermittent liquid discharge. By making the diameter of the guide flow-limiting post 461 smaller than the diameter of the extension post 46, some liquid can first fill the recessed space at the end of the extension post 46 before entering 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 body 522 is larger than the outer diameter of the guide portion 521; the valve core sleeve 54 is also provided with an avoidance cavity 543, and the avoidance cavity 543 is provided between the guide inner wall 541 and the conical mouth 542, and the diameter of the avoidance cavity 543 is smaller than the diameter of the guide inner wall 541.

[0037] The side of the disc body 522 is provided with a flow hole 523 connecting the inside and outside of the disc body 522; the liquid-passing body 1 is also provided with a liquid supply channel 6 connecting the main liquid cavity 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 body 522.

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

[0039] Liquid extraction: Combine 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 the action of negative pressure, and the medicine in the bottle passes through the first liquid control valve 4 into the main liquid chamber 11.

[0040] Injection: Combined Figure 5 As shown, the power source drives the piston 12 to move forward, and the second valve core 52 of the second liquid control valve 5 is reset under the push of the second reset spring 55 and the liquid, and the disc body 522 presses the second sealing ring 53 on the tapered mouth 542, closing the second liquid control valve 5 to prevent 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 push of the liquid, and the first sealing ring 45 enters the second chamber 412 with a larger diameter, connecting the first valve chamber 41, and the medicine passes through the first flow channel 43 and the second flow channel 44 into the gap between the first valve core 42 and the first valve chamber 41, and finally flows from the first valve chamber 41 into the liquid spray port 21, and finally sprays out. When the needle-free syringe 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 a high speed at each pulse moment, the extension column 46 on the first valve core 42 will abut against the liquid spray port 21. After the first sealing ring 45 releases the liquid, the flow-limiting groove 462 controls the cross-sectional area of ​​the liquid flowing into the liquid spray port 21, thereby cooperating with the nozzle 22 to accurately control the liquid spray speed.

[0041] like Figure 6 As shown, according to the second embodiment of the present invention, the difference from the first embodiment is that the needle-free syringe 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 separation channel.

[0042] This embodiment has the advantages brought by 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 at the same time, with high injection efficiency.

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

[0044] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A needle-free syringe, characterized in that: It comprises a liquid-passing body, wherein a main liquid cavity is provided in the liquid-passing body, and a piston is provided in the main liquid cavity; 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 cavity connecting the injection head and the main liquid cavity, a first valve core is provided in the first valve cavity, and one end of the first valve core facing the main liquid cavity is provided with a first flow channel extending axially from its end surface 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 is connected to a side surface 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 a side of the second flow channel away from the main liquid chamber; The first valve core is further provided with an extension column facing the liquid spraying port of the injection head, and a first return spring is further provided between the first valve core and the liquid spraying port; 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 and the first valve core. The liquid supply mechanism further includes a medicine bottle interface, the second liquid control valve is provided 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 on the end of the second valve core facing the main liquid chamber; The piston is connected to a power source.

2. The needle-free injector according to claim 1, wherein The second liquid control valve includes a valve core sleeve, the valve core sleeve is provided with a guide inner wall and a tapered port, the second valve core is provided with a guide portion matched with the guide inner wall, and a disc portion connected to the guide portion; The guide portion is provided with a third flow channel connected from its bottom surface to the side surface; a second sealing ring is provided at the connection between the disc body and the guide portion, and the second sealing ring can abut against the surface of the tapered port to seal the valve core sleeve; The second return spring is arranged in the concave part of the disc body.

3. The needle-free injector according to claim 1, wherein A guiding cone is provided at the connection between the first chamber and the second chamber.

4. The needle-free injector according to claim 1, wherein A guiding current-limiting column is provided at the end of the extension column, and a current-limiting groove is provided on the end surface of the guiding current-limiting column.

5. The needle-free injector according to claim 4, wherein The diameter of the guiding flow-limiting column is smaller than the diameter of the extending column.

6. The needle-free injector according to claim 2, wherein: The outer diameter of the disc body is larger than the outer diameter of the guide part; the valve core sleeve is also provided with an avoidance cavity, which is arranged between the guide inner wall and the tapered mouth, and the diameter of the avoidance cavity is smaller than the diameter of the guide inner wall.

7. The needle-free injector according to claim 6, wherein The side of the disc body is provided with a flow hole connecting the inside and outside of the disc body; the liquid-passing body is also provided with a liquid supply channel connecting the main liquid cavity 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 according to any one of claims 1 to 7, wherein: The needle-free syringe has more than two injection heads, and each injection head is correspondingly provided with the first liquid control valve.

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

10. The needle-free injector according to claim 9, wherein The liquid separation channel includes a main liquid separation channel and a branch liquid separation channel, one end of the branch liquid separation channel is connected to the corresponding first liquid control valve, and the other end merges into the main liquid separation channel; the main liquid separation channel and the branch liquid separation channel are arranged vertically; a liquid separation ball is provided at the converging point of the main liquid separation channel and the branch liquid separation channel, the liquid separation ball is provided in a limiting slide, and a third reset spring is provided between the liquid separation ball and the limiting slide.

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