Needleless injector
By using a rubber ring adaptive seal in a needle-free injector, the problems of unreliable sealing and sluggish response of mechanical valves are solved, thereby improving injection accuracy and speed, simplifying the structure, and increasing drug utilization.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-10
- Publication Date
- 2026-06-19
Smart Images
Figure CN224370377U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of medical device technology, and in particular to a needleless injector. Background Technology
[0002] Needle-free injectors eliminate the need for needles. They are medical devices that inject liquid medications into the patient's skin, subcutaneous tissue, or muscle through a micro-hole at the tip, thus sparing the patient the pain of needle pricks.
[0003] Currently, needle-free injectors commonly use spring-loaded ball valves or metal diaphragm valves to control the flow of the drug solution. These mechanical valves have significant drawbacks: unreliable dynamic sealing: during high-pressure injection, the ball is prone to inertial displacement, leading to seal failure, with drug backflow reaching more than 5% of the total dose, causing dosage errors; delayed response: the mechanical action of the spring valve is delayed by about 10ms, hindering the instantaneous injection of the drug solution and affecting the consistency of injection depth; increased structural complexity: to meet the bidirectional sealing requirements, separate suction and injection valves are required, increasing the number of parts by more than 30% and demanding stringent assembly precision requirements. Utility Model Content
[0004] To address the shortcomings of existing technologies, this invention provides a needleless injector, its liquid aspiration method, and its liquid injection method, which can simplify the injector structure and improve injection accuracy and response speed.
[0005] To address the aforementioned technical problems, this utility model provides a needle-free injector in a first aspect, comprising: a main body having a first cavity and a second cavity inside; the first cavity and the second cavity being connected through a connecting hole; a piston movably disposed in the second cavity; the piston being connected to a syringe booster device; a first valve core having a first end extending into the first cavity, the first end of the first valve core having a first guide cavity that mates with the connecting hole; a first gap being formed between the middle of the first cavity and the first valve core, the first guide cavity being connected to the first gap through a first connecting hole; a first rubber ring being sleeved on the outside of the first connecting hole; and a front cover connected to the second end of the first valve core. The front cover has an injection head on the side away from the first valve core; the second end of the first valve core has a second guide cavity, one end of which is connected to the injection head, and the second guide cavity is connected to the first gap through a second connecting hole; an extension tube is connected to the main body; an injection cavity is provided inside the extension tube, and the injection cavity is connected to the second cavity; a second valve core has its first end extending into the injection cavity, and a second gap is formed between the first end of the second valve core and the inner wall of the injection cavity; the second end of the second valve core has a liquid inlet cavity, which is connected to a third guide cavity, and the third guide cavity is connected to the second gap through a third connecting hole; a second rubber ring is sleeved on the outside of the second connecting hole.
[0006] As an improvement to the above solution, at least three first connecting holes are provided, and multiple first connecting holes are arranged in a ring around the outer wall of the first valve core; the side of the multiple first connecting holes away from the first guide cavity is connected by a first V-groove, and the first rubber ring is sleeved in the first V-groove.
[0007] As an improvement to the above solution, at least three second connecting holes are provided, and multiple second connecting holes are arranged in a ring around the outer wall of the second valve core; the side of the multiple second connecting holes away from the third guide cavity is connected by a second V-groove, and the second rubber ring is sleeved in the second V-groove.
[0008] As an improvement to the above solution, a first sealing ring is provided on the tube wall of the first valve core, and the first sealing ring abuts against the opening of the first cavity; a second sealing ring is provided on the tube wall of the second valve core, and the second sealing ring abuts against the opening of the liquid inlet cavity.
[0009] As an improvement to the above solution, the needleless injector further includes an upper cover, which is sleeved on the outside of the second valve core and the extension tube, and is used to fix the second valve core to the extension tube.
[0010] As an improvement to the above solution, the outer wall of the first valve core is provided with a first sealing groove and a second sealing groove in the circumferential direction. The first sealing groove is located between the first gap and the connecting hole, and the second sealing groove is located between the first gap and the first sealing ring. A first sealing ring is provided in both the first sealing groove and the second sealing groove, and the outer wall of the first sealing ring abuts against the inner wall of the first cavity.
[0011] As an improvement to the above solution, at least one third sealing groove is provided on the outer wall of the side of the second valve core that extends into the injection chamber, and a second sealing ring is provided in the third sealing groove, the second sealing ring abutting against the inner wall of the injection chamber.
[0012] As an improvement to the above solution, the piston has a fourth sealing groove circumferentially provided on its outer wall; a third sealing ring is fitted inside the fourth sealing groove, and the outer wall of the third sealing ring abuts against the inner wall of the second cavity.
[0013] As an improvement to the above solution, the radial width of the first gap is 0.1mm to 0.5mm, and the radial width of the second gap is 0.1mm to 0.5mm.
[0014] As an improvement to the above solution, the angle between the extension tube and the main tube body is 30° to 90°.
[0015] The beneficial effects of implementing this utility model are as follows:
[0016] This invention discloses a needle-free injector that forms an adaptive seal by setting a first rubber ring on a first valve core and a second rubber ring on a second valve core. Under negative or high pressure, the rubber rings are triggered to deform in a specific direction and dynamically fit the sealing surface, completely avoiding the risk of jamming in traditional mechanical valves. At the same time, it reduces the number of independent valve parts, lowers assembly complexity, and simplifies the structure of the injector. The rubber ring deformation response time is significantly improved compared to spring valves, eliminating injection delay and improving injection accuracy and response speed. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the structure of a needle-free injector according to an embodiment of this application;
[0018] Figure 2 This is an exploded view of the structure of a needle-free injector according to an embodiment of this application;
[0019] Figure 3 This is a cross-sectional view of the structure of a needle-free injector according to an embodiment of this application;
[0020] Figure 4 This is a cross-sectional view of the main body and extension tube of a needleless injector according to an embodiment of this application;
[0021] Figure 5 This is a schematic diagram of liquid aspiration using a needleless injector as described in an embodiment of this application;
[0022] Figure 6 This is a schematic diagram of liquid injection using a needleless injector as described in an embodiment of this application.
[0023] The reference numerals in the attached drawings are explained as follows: 100, main body; 110, first cavity; 111, first gap; 120, second cavity; 130, connecting hole; 200, piston; 210, fourth sealing groove; 211, third sealing ring; 300, first valve core; 310, first guide cavity; 311, first connecting hole; 320, first rubber ring; 330, second guide cavity; 331, second connecting hole; 340, first V-groove; 350, first sealing ring; 360, first sealing groove; 370, second... 380. Sealing groove; 390. First sealing ring; 391. Fifth sealing groove; 400. Fourth sealing ring; 410. Front cover; 420. Injection head; 500. Sleeve; 510. Extension tube; 511. Injection chamber; 511. Second gap; 600. Second valve core; 610. Liquid inlet chamber; 620. Third guide chamber; 621. Third connecting hole; 630. Second rubber ring; 640. Second V-groove; 650. Second sealing ring; 660. Third sealing groove; 661. Second sealing ring; 700. Top cover. Detailed Implementation
[0024] To make the objectives, technical solutions and advantages of this utility model clearer, the utility model will be described in further detail below with reference to the accompanying drawings.
[0025] See Figures 1-4 , Figure 1 This is a schematic diagram of the structure of a needle-free injector according to an embodiment of this application; Figure 2 This is an exploded view of the structure of a needle-free injector according to an embodiment of this application; Figure 3 This is a cross-sectional view of the structure of a needle-free injector according to an embodiment of this application; Figure 4 This is a cross-sectional view of the main body and extension tube of a needle-free injector according to an embodiment of this application; as shown in the figure, the needle-free injector includes: a main body 100, which has a first cavity 110 and a second cavity 120 inside; the first cavity 110 and the second cavity 120 are connected through a connecting hole 130; a piston 200, which is movably disposed in the second cavity 120; the piston 200 is connected to the injector's booster device; a first valve core 300, the first end of which extends into the first cavity 110, and the first end of the first valve core 300 is provided with a first guide cavity 310 that mates with the connecting hole 130; a first gap 111 is formed between the middle of the first cavity 110 and the first valve core 300, and the first guide cavity 310 is connected to the first gap 111 through a first connecting hole 311; a first rubber ring 320 is sleeved on the outside of the first connecting hole 311; a front cover 400, which is connected to the second end of the first valve core 300, and the front... An injection head 410 is provided on the side of the cap 400 away from the first valve core 300; a second guide cavity 330 is provided at the second end of the first valve core 300, one end of the second guide cavity 330 is connected to the injection head 410, and the second guide cavity 330 is connected to the first gap 111 through a second connecting hole 331; an extension tube 500 is connected to the main body 100; an injection cavity 510 is provided inside the extension tube 500, and the injection cavity 510 is connected to the second cavity 120; a second valve core 600 has its first end extending into the injection cavity 510, and a second gap 511 is formed between the first end of the second valve core 600 and the inner wall of the injection cavity 510; a liquid inlet cavity 610 is provided at the second end of the second valve core 600, and the liquid inlet cavity 610 is connected to a third guide cavity 620, and the third guide cavity 620 is connected to the second gap 511 through a third connecting hole 621; a second rubber ring 630 is sleeved on the outside of the second connecting hole 331. By setting a first rubber ring 320 on the first valve core 300 and a second rubber ring 630 on the second valve core 600 to form an adaptive seal, the rubber ring is triggered to deform in a directional manner under negative or high pressure, dynamically fitting the sealing surface and completely avoiding the jamming risk of traditional mechanical valves; at the same time, it reduces independent valve parts, lowers assembly complexity, and simplifies the structure of the syringe; the rubber ring deformation response time is significantly improved compared to spring valves, eliminating injection delay and improving injection accuracy and response speed.
[0026] Preferably, the radial width of the first gap 111 is 0.1mm to 0.5mm, and the radial width of the second gap 511 is 0.1mm to 0.5mm. The precise width design of the first gap 111 and the second gap 511 reduces the residual amount of the drug solution to less than 5μL, a 70% reduction compared to traditional structures, and achieves a biopharmaceutical utilization rate of over 99%. The straight-through path of the first guide cavity 310, the first gap 111, and the second guide cavity 330 reduces turbulent energy loss by 90%, ensuring stable injection of the drug solution at a speed of 200±5m / s.
[0027] See Figure 3 Furthermore, in this embodiment, at least three first connecting holes 130 are provided, and the plurality of first connecting holes 130 are arranged in a ring around the outer wall of the first valve core 300; the side of the plurality of first connecting holes 130 away from the first guide cavity 310 is connected by a first V-groove 340, and the first rubber ring 320 is sleeved in the first V-groove 340. By setting the first V-groove 340 to cooperate with the first rubber ring 320, the airtightness of the first rubber ring 320 can be effectively improved; at the same time, the first V-groove 340 can also guide the first rubber ring 320 to deform in a specific direction under negative pressure or high pressure, so as to prevent the first rubber ring 320 from deviating.
[0028] See Figure 3 Furthermore, in this embodiment, at least three second connecting holes 130 are provided, and the plurality of second connecting holes 130 are arranged in a ring around the outer wall of the second valve core 600; the side of the plurality of second connecting holes 130 away from the third guide cavity 620 is connected by a second V-groove 640, and the second rubber ring 630 is sleeved in the second V-groove 640. By setting the second V-groove 640 to cooperate with the second rubber ring 630, the airtightness of the second rubber ring 630 can be effectively improved; at the same time, the second V-groove 640 can also guide the second rubber ring 630 to deform in a specific direction under negative pressure or high pressure, so as to prevent the second rubber ring 630 from deviating.
[0029] Preferably, the opening angle of the first V-groove 340 is 60° to 120°, and the opening angle of the second V-groove 640 is 60° to 120°.
[0030] See Figure 3 Furthermore, in this embodiment, the first valve core 300 has a first sealing ring 350 on its tube wall, and the first sealing ring 350 abuts against the opening of the first cavity 110; the second valve core 600 has a second sealing ring 650 on its tube wall, and the second sealing ring 650 abuts against the opening of the liquid inlet cavity 610. The first sealing ring 350 seals the first cavity 110; the second sealing ring 650 seals the liquid inlet cavity 610.
[0031] See Figure 3 Furthermore, in this embodiment, the front cover 400 also includes a sleeve 420, which is sleeved on the inner side of the first sealing ring 350 and the main body 100. The inner wall of the sleeve 420 is snapped or threaded to the outer wall of the main body 100, and the inner cavity of the sleeve 420 is in communication with the injection head 410.
[0032] See Figure 3 Furthermore, in this embodiment, the needle-free injector also includes an upper cover 700, which is sleeved on the outside of the second valve core 600 and the extension tube 500. The upper cover 700 is used to fix the second valve core 600 to the extension tube 500. Specifically, the upper cover 700 is snapped into the outside of the extension tube 500, and the upper cover 700 is threadedly connected to the second end of the second valve core 600.
[0033] See Figure 2 and Figure 3 Furthermore, in this embodiment, the outer wall of the first valve core 300 is circumferentially provided with a first sealing groove 360 and a second sealing groove 370. The first sealing groove 360 is located between the first gap 111 and the connecting hole, and the second sealing groove 370 is located between the first gap 111 and the first sealing ring 350. A first sealing ring 380 is provided in both the first sealing groove 360 and the second sealing groove 370, and the outer wall of the first sealing ring 380 abuts against the inner wall of the first cavity 110. By providing the first sealing groove 360, the second sealing groove 370, and the first sealing ring 380, the airtightness of the first cavity 110 is improved, ensuring that the liquid medicine in the first cavity 110 is advanced along a designated path.
[0034] See Figure 2 and Figure 3 Furthermore, in this embodiment, a third sealing groove 660 is provided on the outer wall of the side of the second valve core 600 that extends into the injection chamber 510. A second sealing ring 661 is provided in the third sealing groove 660, and the second sealing ring 661 abuts against the inner wall of the injection chamber 510. By providing the third sealing groove 660 and the second sealing ring 661, the airtightness of the injection chamber 510 is improved, ensuring that the liquid medicine is advanced along the designated path.
[0035] See Figure 2 and Figure 3 Furthermore, in this embodiment, the outer wall of the piston 200 is provided with a fourth sealing groove 210 circumferentially; a third sealing ring 211 is sleeved inside the fourth sealing groove 210, and the outer wall of the third sealing ring 211 abuts against the inner wall of the second cavity 120. By providing the fourth sealing groove 210 and the third sealing ring 211, the airtightness of the second cavity 120 is improved.
[0036] See Figure 2 and Figure 3 Furthermore, in this embodiment, the second end of the first valve core 300 is provided with a fifth sealing groove 390, and a fourth sealing ring 391 is provided in the fifth sealing groove 390. The outer wall of the fourth sealing ring 391 abuts against the inner wall of the sleeve 420 to improve the airtightness of the front cover 400.
[0037] See Figure 4 Preferably, the angle between the extension tube 500 and the main tube 100 is 30° to 90°, preferably 45°; the axial center lines of the first valve core 300 and the second valve core 600 are arranged in a non-parallel manner.
[0038] Preferably, the first rubber ring 320 and the second rubber ring 630 are made of medical-grade silicone or fluororubber.
[0039] Preferably, the piston 200 is connected to the striker of the booster device.
[0040] See Figure 5 , Figure 5 This is a schematic diagram of liquid aspiration using a needleless injector as described in an embodiment of this application.
[0041] This embodiment provides a liquid aspiration method using a needle-free injector in a second aspect, comprising the following steps:
[0042] Connect the external medicine bottle to the inlet chamber 610;
[0043] The piston 200 is driven by the booster device to move away from the first chamber 110, thereby creating a negative pressure in the second chamber 120.
[0044] The first rubber ring 320 seals the first connecting hole 311 under negative pressure;
[0045] Under negative pressure, the second rubber ring 630 deforms and opens outward, and the liquid enters the second cavity 120 through the liquid inlet cavity 610, the third guide cavity 620, the third connecting hole 621 and the second gap 511 in sequence, thus completing the liquid aspiration.
[0046] See Figure 6 , Figure 6 This is a schematic diagram of the injection of a needleless injector according to an embodiment of this application;
[0047] This embodiment provides a method for injecting liquid using a needle-free injector, comprising the following steps:
[0048] The piston 200 is driven by a booster device to move closer to the first chamber 110;
[0049] The second rubber ring 630 retracts inward under the strong action of the medicated liquid, sealing the third connecting hole 621 to block backflow;
[0050] The liquid medicine enters the first guide cavity 310 through the connecting hole 130, pushes open the first rubber ring 320, flows into the first gap 111 through the first connecting hole 311, then enters the second guide cavity 330 through the second connecting hole 331, enters the injection head 410 through the second guide cavity 330, and is finally ejected from the injection head 410.
[0051] As can be seen from the above, the needleless injector of this utility model forms an adaptive seal by setting a first rubber ring on the first valve core and a second rubber ring on the second valve core. Under negative or high pressure, the rubber ring is triggered to deform in a directional manner and dynamically fit the sealing surface, completely avoiding the risk of jamming of traditional mechanical valves. At the same time, it reduces independent valve parts, reduces assembly complexity, and simplifies the structure of the injector. The rubber ring deformation response time is significantly improved compared with spring valves, eliminating injection delay and improving injection accuracy and response speed.
[0052] 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 needle-free injector, characterized in that, include: The main body has a first cavity and a second cavity inside; the first cavity and the second cavity are connected by a connecting hole. A piston is movably disposed in the second cavity; the piston is connected to the syringe's booster device; A first valve core, the first end of which extends into the first cavity, and the first end of the first valve core is provided with a first guide cavity that mates with the communication hole; A first gap is formed between the middle of the first cavity and the first valve core, and the first guide cavity is connected to the first gap through a first connecting hole; a first rubber ring is sleeved on the outside of the first connecting hole. A front cover is connected to the second end of the first valve core, and an injection head is provided on the side of the front cover away from the first valve core; a second guide cavity is provided at the second end of the first valve core, one end of the second guide cavity is connected to the injection head, and the second guide cavity is connected to the first gap through a second connecting hole; An extension tube is connected to the main body; the extension tube has an injection cavity, which communicates with the second cavity. The second valve core has a first end that extends into the injection chamber, and a second gap is formed between the first end of the second valve core and the inner wall of the injection chamber; the second end of the second valve core is provided with a liquid inlet chamber, which is connected to a third guide chamber, and the third guide chamber is connected to the second gap through a third connecting hole; a second rubber ring is sleeved on the outside of the second connecting hole.
2. The needle-free injector according to claim 1, characterized in that, The first connecting hole is provided with at least three, and the plurality of the first connecting holes are arranged in a ring around the outer wall of the first valve core; the side of the plurality of the first connecting holes away from the first guide cavity is connected by a first V-groove, and the first rubber ring is fitted in the first V-groove.
3. A needle-free injector according to claim 1, characterized in that, The second connecting hole is provided with at least three, and the plurality of second connecting holes are arranged in a ring around the outer wall of the second valve core; the side of the plurality of second connecting holes away from the third guide cavity is connected by a second V-groove, and the second rubber ring is fitted inside the second V-groove.
4. A needle-free injector according to claim 1, characterized in that, The first valve core has a first sealing ring on its tube wall, and the first sealing ring abuts against the opening of the first cavity; The second valve core has a second sealing ring on its tube wall, and the second sealing ring abuts against the opening of the liquid inlet chamber.
5. A needle-free injector according to claim 1, characterized in that, The needleless injector also includes an upper cover, which is sleeved on the outside of the second valve core and the extension tube, and is used to fix the second valve core to the extension tube.
6. A needle-free injector according to claim 4, characterized in that, The outer wall of the first valve core is provided with a first sealing groove and a second sealing groove in the circumferential direction. The first sealing groove is located between the first gap and the connecting hole, and the second sealing groove is located between the first gap and the first sealing ring. A first sealing ring is provided in both the first sealing groove and the second sealing groove, and the outer wall of the first sealing ring abuts against the inner wall of the first cavity.
7. A needle-free injector according to claim 1, characterized in that, The second valve core has at least one third sealing groove on the outer wall of the side that extends into the injection chamber. A second sealing ring is provided in the third sealing groove, and the second sealing ring abuts against the inner wall of the injection chamber.
8. A needle-free injector according to claim 1, characterized in that, The piston has a fourth sealing groove circumferentially arranged on its outer wall; a third sealing ring is fitted inside the fourth sealing groove, and the outer wall of the third sealing ring abuts against the inner wall of the second cavity.
9. A needle-free injector according to claim 1, characterized in that, The radial width of the first gap is 0.1mm to 0.5mm, and the radial width of the second gap is 0.1mm to 0.5mm.
10. A needle-free injector according to claim 1, characterized in that, The angle between the extension tube and the main tube is 30° to 90°.