A converging multi-head needleless injector

Abstract

This utility model relates to the field of medical devices, specifically disclosing a multi-head needleless injector with a flow-through mechanism, comprising a fluid-passing body, an injection head, and a fluid supply mechanism. The fluid-passing body has a fluid-passing chamber containing a push plug. The injection head is located at the front end of the fluid-passing body and has three or more injection nozzles. The fluid supply mechanism is located on one side of the fluid-passing body. The injection head has a first valve chamber separated from the fluid-passing chamber by a partition plate with a connecting hole. A first valve core is located within the first valve chamber. The fluid supply mechanism has a second valve chamber containing a second valve core. The first valve core includes a flow-dividing plate and a drainage column. The flow-dividing plate has a flow-dividing cavity on its front side, and the drainage column has a conical portion, a converging channel, and a diverting channel. Using this utility model, injection can be performed simultaneously through multiple injection nozzles, improving efficiency, and ensuring a consistent flow rate for each injection nozzle.

Description

Technical Field

[0001] This utility model relates to the field of medical devices, and in particular to a manifold multi-head 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 supplying medication, the injection head closes and the supply end opens; when injection is needed, the supply end closes and the injection head opens, allowing switching between supply and injection. Some needle-free injectors with dual injection heads have their injection heads connected to the main channel via branch channels. The different injection heads are affected by factors such as the internal conditions of the branch channels, resulting in inconsistent medication spray rates and affecting the drug's effectiveness. Utility Model Content

[0003] To address the shortcomings of existing technologies, this invention provides a multi-head needleless injector that can inject simultaneously through multiple nozzles, improving efficiency, with each nozzle having a consistent flow rate.

[0004] To address the aforementioned technical problems, this utility model provides a multi-head needleless injector with a flow-through mechanism, comprising a fluid-through body, an injection head, and a fluid supply mechanism. The fluid-through body has a fluid-through cavity, and a fluid-push plug is provided within the fluid-through cavity. The injection head is located at the front end of the fluid-through body and has three or more injection nozzles. The fluid supply mechanism is located on one side of the fluid-through body and is used to supply fluid to the fluid-through cavity.

[0005] The injection head has a first valve chamber, which is separated from the liquid passage chamber by a partition plate, and the partition plate is provided with a connecting hole; a first valve core is provided in the first valve chamber, and the liquid supply mechanism has a second valve chamber, which is provided with a second valve core.

[0006] The first valve core includes a flow divider and a flow guide column extending axially from the back of the flow divider. The flow divider has a flow divider cavity corresponding to the injection nozzle on its front side. The flow guide column has a tapered portion for blocking the connecting hole, a converging flow channel located at the axis, and two or more symmetrically arranged flow dividers extending from the side of the flow guide column to the converging flow channel. The flow divider cavity is connected to the converging flow channel through a first dispensing hole.

[0007] As an improvement to the above solution, the side of the flow divider is a complete cylindrical surface; the side of the flow divider is configured to cooperate with the side wall of the first valve chamber.

[0008] As an improvement to the above solution, the injection nozzle includes a cylindrical cavity and a conical cavity, the conical cavity being located at the bottom of the cylindrical cavity, and a first spring being provided on the cylindrical cavity, the first spring being connected to the flow divider.

[0009] As an improvement to the above solution, one end of the first spring is disposed in the flow-dividing cavity, and the flow-dividing cavity is directly opposite the corresponding cylindrical cavity.

[0010] As an improvement to the above solution, the injection head is further provided with a buffer cavity, the injection nozzle is arranged around the buffer cavity, and one end of the confluence channel is connected to the buffer cavity.

[0011] As an improvement to the above solution, the side of the distribution plate has a side flow channel, and the distribution cavity is connected to the side flow channel through a second liquid distribution hole.

[0012] As an improvement to the above solution, the diameter of the drainage column is smaller than the diameter of the diversion plate.

[0013] As an improvement to the above solution, the liquid supply mechanism includes a valve core sleeve, a ball, and a second spring. One end of the valve core sleeve forms a medicine bottle mounting part, and the other end is provided with an arc-shaped seat. The ball is located on the arc-shaped seat, and the second spring is located at the bottom.

[0014] As an improvement to the above solution, a conical groove is provided on one side of the connecting hole, and the conical part can abut against the conical groove to block the connecting hole.

[0015] As an improvement to the above scheme, the diameter of the merging channel is larger than the diameter of the branching channel.

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

[0017] In this embodiment, the first valve core guides the liquid flowing into the injection nozzle using a guide column and a distribution plate. During injection, the pusher plug pushes the liquid from the connecting hole into the first valve chamber. Since the diameters of the distribution channel and the merging channel are smaller than the diameter of the connecting hole, the first valve core is pushed as a whole towards the injection nozzle. The first valve core pushes the liquid between itself and the injection nozzle from the corresponding distribution chamber into the injection nozzle, ensuring a consistent flow rate for each injection nozzle. When the pusher plug stops moving, the first valve core moves away from the injection nozzle under the reset action of the first spring. Liquid on the back of the distribution plate enters the merging channel from the distribution channel, filling the space in the distribution chamber and preparing for the next injection. During the reset process of the first valve core, the radially arranged distribution channel and the axially arranged merging channel act as a buffer, reducing vibration and noise during the reset process. The liquids converge from symmetrically arranged distribution channels and enter the confluence channel together. Then, they are distributed into the distribution chamber through the first distribution hole, ensuring that the internal components of the liquid are evenly dispersed. All parts of the distribution chamber are fully disturbed to avoid the accumulation of dirt after long-term use. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of an embodiment of the present invention: a multi-head needleless injector.

[0019] Figure 2 This is a cross-sectional view of an embodiment of the present invention: a multi-head needleless injector.

[0020] Figure 3 yes Figure 2 Enlarged view of part A;

[0021] Figure 4 This is a schematic diagram of an embodiment of the first valve core of this utility model;

[0022] Figure 5 This is a schematic diagram of another embodiment of the first valve core of this utility model. Detailed Implementation

[0023] 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.

[0024] like Figures 1-4As shown, the first embodiment of this utility model provides a multi-head needleless injector with a flow-through body 1, an injection head 2, and a liquid supply mechanism 3. The flow-through body 1 has a flow-through cavity 11, and a liquid pusher 12 is provided in the flow-through cavity 11. The injection head 2 is located at the front end of the flow-through body 1 and has three or more injection nozzles 4. The liquid supply mechanism 3 is located on one side of the flow-through body 1 and is used to supply liquid to the flow-through cavity 11.

[0025] The injection head 2 has a first valve chamber 21, which is separated from the liquid passage chamber 11 by a partition plate 22. The partition plate 22 is provided with a connecting hole 221. The first valve chamber 21 is provided with a first valve core 23. The liquid supply mechanism 3 has a second valve chamber 31, which is provided with a second valve core 32.

[0026] The first valve core 23 includes a flow divider 231 and a flow guide 232 extending axially from the back of the flow divider 231. The flow divider 231 has a flow divider cavity 233 on its front side corresponding to the injection nozzle 4. The flow guide 232 has a tapered portion 234 for blocking the connecting hole 221, a converging flow channel 235 located at the axis, and two or more symmetrically arranged flow dividers 236 extending from the side of the flow guide 232 to the converging flow channel 235. The flow divider cavity 233 communicates with the converging flow channel 235 through a first liquid dispensing hole 237.

[0027] It should be noted that this embodiment uses an injection head 2 with four injection nozzles 4 as an example. Depending on actual needs, the number of injection nozzles 4 can also be three, which are distributed in a straight line or a triangle on the injection head. To improve injection efficiency, a single injection head 2 can also be equipped with five or more injection nozzles 4.

[0028] In this embodiment, the first valve core 23 guides the liquid flowing into the injection nozzle 4 using the guide column 232 and the diverting plate 231. During injection, the push plug 12 pushes the liquid from the connecting hole 221 into the first valve chamber 21. Since the diameters of the diverting channel 236 and the confluence channel 235 are smaller than the diameter of the connecting hole 221, the first valve core 23 is pushed as a whole towards the injection nozzle 4. The first valve core 23 pushes the liquid between the first valve core 23 and the injection nozzle 4 from the corresponding diverting chamber 233 into the injection nozzle 4, ensuring a consistent flow rate for each injection nozzle 4. When the push plug 12 stops moving, the first valve core 23 moves away from the injection nozzle 4 under the reset action of the first spring 24. The liquid on the back of the diverting plate 231 enters the confluence channel 235 from the diverting channel 236, filling the space in the diverting chamber 233 and preparing for the next injection. During the reset process of the first valve core 23, the radially arranged branching channel 236 and the axially arranged converging channel 235 act as a buffer, reducing vibration and noise during the reset process. Liquid flows from the symmetrically arranged branching channels 236 into the converging channel 235, and then is distributed into the branching chamber 233 through the first distributing hole 237. This ensures uniform dispersion of the drug components within the liquid, and that all parts of the branching chamber 233 are sufficiently agitated, preventing the accumulation of dirt after prolonged use.

[0029] Preferably, the side surface of the diverter plate 231 is a complete cylindrical surface; the side surface of the diverter plate 231 is configured to mate with the side wall of the first valve cavity 21. In this embodiment, the side surface of the diverter plate 231 is the mating surface with the first valve cavity 21, ensuring that the diverter plate 231 moves axially along the first valve cavity 21, and also preventing liquid from flowing between the first valve cavity 21 and the diverter plate 231, thus weakening the overall liquid pushing effect of the diverter plate 231.

[0030] To further improve the uniformity of the injection speed of different injection nozzles 4, the injection nozzle 4 includes a cylindrical cavity 41 and a conical cavity 42. The conical cavity 42 is located at the bottom of the cylindrical cavity 41. A first spring 24 is provided on the cylindrical cavity 41, and the first spring 24 is connected to the flow divider 231.

[0031] More preferably, one end of the first spring 24 is disposed in the flow-dividing cavity 233, which is directly opposite the corresponding cylindrical cavity 41. When the flow-dividing disk 231 moves toward the injection nozzle 4, the flow-dividing cavity 233 and the cylindrical cavity 41 quickly approach each other until they are completely closed, so that each cylindrical cavity 41 receives approximately the same hydraulic pressure, thereby ensuring a uniform flow rate at different injection nozzles 4.

[0032] In some embodiments, the injection head 2 is further provided with a buffer cavity 25, the injection nozzle 4 is arranged around the buffer cavity 25, and one end of the confluence channel 235 is connected to the buffer cavity 25. The buffer cavity 25 serves as a buffer area between the confluence channel 235 and the diversion cavity 233. During the injection and reset actions of the diversion plate 231, it provides diversion space for the liquid to enter and exit the diversion cavity 233 and the confluence channel 235, thus preventing the liquid from flowing too fast in the first dispensing hole 237 and generating noise.

[0033] To provide sufficient thrust to the back of the diverting plate 231 and sufficient flow space to the inlet of the diverting channel 236, the diameter of the guiding column 232 is smaller than the diameter of the diverting plate 231. The diameter of the converging channel 235 is larger than the diameter of the diverting channel 236. This allows for liquid acceleration in the smaller-diameter diverting channel 236, while the converging channel 235 provides a larger confluence space, ensuring uniform mixing of all components in the liquid.

[0034] Preferably, the liquid supply mechanism 3 includes a valve core sleeve 33, a sphere, and a second spring 34, wherein the second valve core 32 is the sphere. One end of the valve core sleeve 33 forms a medicine bottle mounting portion 331, and the other end is provided with an arc-shaped seat 332. The sphere is disposed on the arc-shaped seat 332, and the second spring 34 is provided at the bottom. A conical groove 222 is provided on one side of the connecting hole 221, and the conical portion 234 can abut against the conical groove 222 to block the connecting hole 221.

[0035] The working principle of this syringe is explained in detail below:

[0036] Take the liquid:

[0037] The power mechanism drives the liquid pusher 12 to move away from the injection head 2, and the conical part 234 of the first valve core 23 blocks the connecting hole 221 of the partition plate 22; the medicine bottle mounting part 331 is equipped with a medicine bottle containing liquids such as hyaluronic acid. After the liquid pusher 12 moves backward, a negative pressure is generated at the front end of the liquid pusher 12, and a negative pressure is also generated in the second valve chamber 31. The ball leaves the valve core sleeve 33, and the liquid enters the liquid passage chamber 11 from the valve core sleeve 33 through the ball.

[0038] injection:

[0039] The power mechanism drives the push plug 12 to move towards the injection head 2, and the ball seals the valve core sleeve 33 to prevent the liquid from flowing back into the medicine bottle. The liquid flows into the first valve chamber 21 from the connecting hole 221. Since the first valve chamber 21 is divided by the diverter plate 231, and the diverter plate 231 is connected to both ends only through the diverter channel 236 and the confluence channel 235, and the diameter of the diverter channel 236 is small, the diverter plate 231 will move as a whole towards the injection nozzle 4 during the injection process. The displacement of the diverter plate 231 mainly compresses the space in front of the diverter plate 231, forcing the liquid into the injection nozzle 4, and finally spraying it out from the injection nozzle 4. Since the distance between the front end of the diverter plate 231 and the injection nozzle 4 is small, when the injection starts, the diverter chamber 233 of the diverter plate 231 and the cylindrical cavity 41 of the injection nozzle 4 will combine into a relatively independent space. The displacement of the diverter plate 231 provides the thrust, ensuring that multiple injection nozzles 4 have sufficient injection speed and consistent flow rate. After the push plug 12 stops moving, the first valve core 23 is reset under the action of the first spring 24, and the liquid enters the diversion chamber 233 through the diversion channel 236, the confluence channel 235 and the first diversion hole 237, in preparation for the next injection.

[0040] Combination Figure 5 As shown, according to the second embodiment of the present invention, the difference from the first embodiment is that the side of the diversion plate 231 has a side flow channel 237, and the diversion cavity 233 is connected to the side flow channel 237 through the second liquid distribution hole 238.

[0041] By opening a side flow channel 237 and cooperating with the second liquid distribution hole 238, during injection, liquid can enter from both sides of the distribution chamber 233, increasing the liquid supply speed; liquid flows through the center and sides of the distribution plate 231, making the distribution plate 231 form a "suspended" effect, and the movement of the first valve core 23 is smoother.

[0042] 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 manifold multi-head needleless injector, characterized in that, The device includes a liquid-passing body, an injection head, and a liquid supply mechanism. The liquid-passing body has a liquid-passing chamber, and a liquid-push plug is provided in the liquid-passing chamber. The injection head is located at the front end of the liquid-passing body and has three or more injection nozzles. The liquid supply mechanism is located on one side of the liquid-passing body and is used to supply liquid to the liquid-passing chamber. The injection head has a first valve chamber, which is separated from the liquid passage chamber by a partition plate, and the partition plate is provided with a connecting hole; a first valve core is provided in the first valve chamber, and the liquid supply mechanism has a second valve chamber, which is provided with a second valve core. The first valve core includes a flow divider and a flow guide column extending axially from the back of the flow divider. The flow divider has a flow divider cavity corresponding to the injection nozzle on its front side. The flow guide column has a tapered portion for blocking the connecting hole, a converging flow channel located at the axis, and two or more symmetrically arranged flow dividers extending from the side of the flow guide column to the converging flow channel. The flow divider cavity is connected to the converging flow channel through a first dispensing hole.

2. The multi-head needleless injector as described in claim 1, characterized in that, The side of the flow divider is a complete cylindrical surface; the side of the flow divider is configured to cooperate with the side wall of the first valve chamber.

3. The multi-head needleless injector as described in claim 1, characterized in that, The injection nozzle includes a cylindrical cavity and a conical cavity. The conical cavity is located at the bottom of the cylindrical cavity. A first spring is provided on the cylindrical cavity, and the first spring is connected to the flow divider.

4. The multi-head needleless injector as described in claim 3, characterized in that, One end of the first spring is located in the flow-dividing cavity, which is directly opposite the corresponding cylindrical cavity.

5. The multi-head needleless injector as described in claim 1, characterized in that, The injection head is also provided with a buffer cavity, the injection nozzle is arranged around the buffer cavity, and one end of the confluence channel is connected to the buffer cavity.

6. The multi-head needleless injector as described in any one of claims 1-5, characterized in that, The side of the distribution plate has a side flow channel, and the distribution cavity is connected to the side flow channel through a second liquid distribution hole.

7. The multi-head needleless injector as described in claim 1, characterized in that, The diameter of the drainage column is smaller than the diameter of the diverter plate.

8. The multi-head needleless injector as described in claim 1, characterized in that, The liquid supply mechanism includes a valve core sleeve, a ball, and a second spring. One end of the valve core sleeve forms a medicine bottle mounting part, and the other end is provided with an arc-shaped seat. The ball is located on the arc-shaped seat, and the second spring is located at the bottom.

9. The multi-head needleless injector as described in claim 1, characterized in that, A tapered groove is provided on one side of the connecting hole, and the tapered part can abut against the tapered groove to block the connecting hole.

10. The multi-head needleless injector as described in claim 1, characterized in that, The diameter of the merging channel is larger than the diameter of the branching channel.

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