An adjustable flow rate shunt injection device and a needle-free injector

Abstract

This utility model relates to the field of medical device technology and discloses an adjustable flow rate shunt injection device and a needle-free injector. It includes an injection shunt connector and a regulating valve assembly. The injection shunt connector has a central flow channel, a shunt orifice, an injection chamber, and a regulating chamber. The shunt orifices are arranged in an array around the outer periphery of the central flow channel. The injection chamber and the regulating chamber are correspondingly arranged with respect to the shunt orifices. One end of each shunt orifice communicates with the central flow channel, and the other end communicates with at least one of the injection chamber and the regulating chamber. The regulating chamber is intersected with at least one of the injection chamber and the shunt orifice. The injection chamber is coaxially connected to the injection orifice that communicates with the outside. The regulating valve assembly is located within the regulating chamber, and the length of the regulating valve assembly extending towards the injection chamber or the shunt orifice is adjustable. This utility model allows for adjustable injection dosage per unit time.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to an adjustable flow rate shunt injection device and a needleless injector. Background Technology

[0002] Needle-free injectors eliminate the need for needles. Instead, they are medical devices that inject liquid medications into the patient's skin, subcutaneous tissue, or muscle through a micro-orifice at the tip by applying high pressure. This significantly reduces injection pain and psychological burden.

[0003] Most needle-free injectors currently available are single-head injectors, which can only deliver a small dose per unit time, and the injection dose per unit time cannot be adjusted.

[0004] Therefore, it is necessary to provide a needle-free injector with an adjustable injection dose per unit time. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide an adjustable flow rate diversion injection device, wherein the injection dose per unit time is adjustable.

[0006] The technical problem to be solved by this utility model is to provide a needleless injector with adjustable injection dose per unit time.

[0007] To solve the above-mentioned technical problems, this utility model provides an adjustable flow rate diversion injection device, including an injection diversion connector and a regulating valve assembly.

[0008] The injection diversion connector is provided with a central flow channel, a diversion hole, an injection chamber, and an adjustment chamber. The diversion holes are arranged in an array on the outer periphery of the central flow channel. The injection chamber and the adjustment chamber are respectively arranged corresponding to the diversion holes. One end of the diversion hole is connected to the central flow channel, and the other end is connected to at least one of the injection chamber and the adjustment chamber. The adjustment chamber is arranged intersectingly with at least one of the injection chamber and the diversion hole. The injection chamber is coaxially connected to the injection hole that connects to the outside.

[0009] The regulating valve assembly is located in the regulating chamber, and the length of the regulating valve assembly extending toward the injection chamber or the diversion orifice is adjustable.

[0010] As an improvement to the above solution, the regulating chamber includes a flow-limiting chamber and a limiting chamber, the regulating valve assembly includes a regulating valve core and a limiting stud, the regulating valve core is sealed to the flow-limiting chamber, the limiting stud is connected to the limiting chamber, the end face of the limiting stud is provided with a first tooth groove, and the side wall of the regulating valve core is provided with a second tooth groove opposite to the limiting chamber. When the limiting stud is rotated to a preset position, the first tooth groove and the second tooth groove engage.

[0011] The flow-limiting chamber is provided with a first anti-rotation plane, and the regulating valve core extending into the side wall of the flow-limiting chamber is provided with a second anti-rotation plane, the second anti-rotation plane being opposite to the first anti-rotation plane.

[0012] As an improvement to the above solution, the flow-limiting chamber is coaxially arranged with the flow-diverting orifice, and the portion of the regulating valve assembly extending into the injection chamber is adapted to the flow-diverting orifice.

[0013] As an improvement to the above solution, the central flow channel is arranged parallel to the injection chamber, and the diversion hole is arranged from the central flow channel in a direction away from the injection hole.

[0014] As an improvement to the above solution, a needleless injection head is also included. The injection hole is located inside the needleless injection head. The injection chamber includes an installation chamber and a flow guiding chamber. The flow guiding chamber connects the installation chamber with the diversion hole and the adjustment chamber. The cross-sectional area of ​​the diversion hole is smaller than the cross-sectional area of ​​the central flow channel and not smaller than the cross-sectional area of ​​the flow guiding chamber. The needleless injection head is located inside the installation chamber.

[0015] As an improvement to the above scheme, the second tooth groove is provided on the second anti-rotation plane, and the second tooth groove is arranged in an array along the axial direction.

[0016] As an improvement to the above solution, the end of the regulating valve core opposite to the diversion hole is a conical surface.

[0017] In addition, this utility model also provides a needleless injector, which includes a liquid inlet body, a liquid outlet valve, a first piston, and the aforementioned flow rate adjustable diversion injection device.

[0018] The liquid-conducting body is provided with a transition chamber, and a liquid outlet chamber and a power chamber respectively located at both ends of the transition chamber. The transition chamber is used for pre-filling with liquid. The injection diverter is sealed to the liquid-conducting body, and the central flow channel communicates with the liquid outlet chamber. One end of the liquid outlet valve abuts against the injection diverter, and the other end is telescopically located at the adjacent end of the liquid outlet chamber and the transition chamber. The first piston is located in the power chamber and is connected to a power source to drive the liquid in the transition chamber to squeeze the liquid outlet valve, so that the transition chamber communicates with or disconnects from the central flow channel.

[0019] As an improvement to the above solution, the dispensing valve includes a first valve core and a first elastic reset member. The first valve core is located at one end of the dispensing chamber near the transition chamber. The central flow channel has a first abutment cavity opposite to the dispensing valve. The first valve core has a second abutment cavity opposite to the first abutment cavity. The two ends of the first elastic reset member abut against the first abutment cavity and the second abutment cavity, respectively. The outer peripheral surface of the first valve core has a first gap with the inner wall of the dispensing chamber. The first valve core has a first liquid guide groove or a first liquid guide hole that connects the first gap with the second abutment cavity. The first liquid guide groove is disposed toward the opening of the injection diverter connector.

[0020] As an improvement to the above solution, it also includes an inlet valve and an inlet connector. The liquid-conducting body is further provided with an inlet chamber that crosses and communicates with the transition chamber. The inlet connector is provided with an inlet channel that communicates with the inlet chamber. The inlet valve includes a second valve core and a second elastic reset member. The outer peripheral surface of the second valve core has a second gap with the inner wall of the inlet chamber. The second gap communicates with the transition chamber. The side of the second valve core facing away from the inlet connector is provided with a third abutment cavity. The inlet chamber is provided with a fourth abutment cavity that is opposite to the third abutment cavity. The second elastic reset member abuts against the third abutment cavity and the fourth abutment cavity, which can drive the second valve core to move towards the inlet channel and disconnect the second gap from the inlet channel.

[0021] Implementing this utility model has the following beneficial effects:

[0022] This utility model discloses an adjustable flow rate diversion injection device and a needleless injector. The injection diversion connector is provided with an adjustment chamber corresponding to the diversion orifice. One end of the diversion orifice is connected to the central flow channel, and the other end is connected to at least one of the injection chamber and the adjustment chamber. That is, the end of the diversion orifice is connected to the injection chamber, or to the adjustment chamber, or to both the injection chamber and the adjustment chamber simultaneously. The adjustment chamber is cross-arranged with at least one of the injection chamber and the diversion orifice. The injection chamber is coaxially connected to the injection orifice that connects to the outside. The adjustment valve group is provided in the adjustment chamber, and the length of the adjustment valve group extending toward the injection chamber or the diversion orifice is adjustable. When the first piston moves in the power chamber, it will change the cross-sectional area of ​​the injection chamber and / or the diversion orifice chamber, thereby controlling the speed at which the liquid is ejected from the injection orifice and realizing the adjustment of the injection speed of the injection orifice.

[0023] By setting an inlet connector and an injection diverter connector on the liquid-passing body, controlling the opening and closing of the transition chamber of the liquid-passing body and the central flow channel in the injection diverter connector through the outlet valve located in the outlet chamber, and controlling the opening and closing of the inlet channel of the transition chamber of the liquid-passing body and the inlet connector through the inlet valve located in the inlet chamber, and by setting diverter holes and injection chambers coaxially connected to the injection holes that connect to the outside through an array on the outer periphery of the central flow channel of the injection diverter connector, the diverter holes are connected to the corresponding injection chambers. Driven by the first piston, the liquid in each injection chamber can be simultaneously ejected into the injection hole, achieving higher injection efficiency. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of an embodiment of the adjustable flow rate diversion injection device of this utility model;

[0025] Figure 2 Yes, yes Figure 1 A sectional view through the CC section;

[0026] Figure 3 This is a schematic diagram of one end of the injection shunt connector;

[0027] Figure 4 This is a schematic diagram of the other end of the injection shunt connector;

[0028] Figure 5 This is a cross-sectional view of the injection manifold.

[0029] Figure 6 These are the front and side views of the regulating valve core;

[0030] Figure 7 This is a schematic diagram of the structure of a needle-free injection head;

[0031] Figure 8 This is a schematic diagram of an embodiment of the needle-free injector of this utility model;

[0032] Figure 9 yes Figure 1 A cross-sectional view of the fluid-carrying body through the plane of symmetry;

[0033] Figure 10 yes Figure 1 A sectional view through the plane of symmetry;

[0034] Figure 11 yes Figure 10 A schematic diagram of the structure in the liquid extraction state;

[0035] Figure 12 yes Figure 10 A schematic diagram of the injection state structure;

[0036] Figure 13 yes Figure 10 A magnified structural diagram of part A;

[0037] Figure 14 yes Figure 10 A schematic diagram of the enlarged structure of part B;

[0038] Figure 15 This is a cross-sectional view of the first valve core through the plane of symmetry;

[0039] Figure 16 yes Figure 15 Left view of the first valve core shown;

[0040] Figure 17 yes Figure 15 The right view of the first valve core shown. Detailed Implementation

[0041] 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.

[0042] like Figures 1 to 7 As shown, this utility model discloses an embodiment of an adjustable flow rate diversion injection device, including an injection diversion connector 2 and a regulating valve group. The injection diversion connector 2 is provided with a central flow channel 21, a diversion hole 22, an injection chamber 23, and a regulating chamber 24. The central flow channel 21 communicates with the liquid outlet chamber 11. The diversion holes 22 are arranged in an array around the outer periphery of the central flow channel 21. The injection chamber 23 and the regulating chamber 24 are respectively arranged corresponding to the diversion holes 22. One end of the diversion hole 22 communicates with the central flow channel 21, and the other end communicates with at least one of the injection chamber 23 and the regulating chamber 24. The regulating chamber 24 is arranged crosswise with at least one of the injection chamber 23 and the diversion hole 22. The injection chamber 23 is coaxially connected to the injection hole 81 that communicates with the outside. The regulating valve group is provided in the regulating chamber 24, and the length of the regulating valve group extending toward the injection chamber 23 or the diversion hole 22 is adjustable.

[0043] The injection diversion connector disclosed in this embodiment is provided with an adjustment chamber corresponding to the diversion orifice. One end of the diversion orifice is connected to the central flow channel, and the other end is connected to at least one of the injection chamber and the adjustment chamber. That is, the end of the diversion orifice is connected to the injection chamber, or to the adjustment chamber, or to both the injection chamber and the adjustment chamber. The adjustment chamber is cross-arranged with at least one of the injection chamber and the diversion orifice. The injection chamber is coaxially connected to the injection orifice that connects to the outside. The adjustment valve group is provided in the adjustment chamber, and the length of the adjustment valve group extending toward the injection chamber or the diversion orifice is adjustable. When the first piston moves in the power chamber, it will change the cross-sectional area of ​​the injection chamber and / or the diversion orifice chamber, control the speed at which the liquid is ejected from the injection orifice, and realize the adjustment of the injection speed of the injection orifice.

[0044] In this embodiment, the regulating chamber 24 of the injection diversion connector 2 specifically includes a flow-limiting chamber 241 and a limiting chamber 242. The regulating valve assembly includes a regulating valve core 71 and a limiting stud 72. The regulating valve core 71 is sealed to the flow-limiting chamber 241, and the limiting stud 72 is connected to the limiting chamber 242. The end face of the limiting stud 72 is provided with a first tooth groove 721, and the side wall of the regulating valve core 71 is provided with a second tooth groove 711 opposite to the limiting chamber 242. When the limiting stud 72 is rotated to a preset position, the first tooth groove 721 and the second tooth groove 711 engage to prevent the regulating valve core 71 from moving axially, thereby maintaining the current extension amount of the regulating valve core 71 towards the injection chamber 23 or the diversion hole 22, so that the liquid flow rate ejected from the injection hole 81 is stable and controllable.

[0045] In addition, the inner wall of the flow-limiting chamber 241 is provided with a first anti-rotation plane 242, and the outer wall of the regulating valve core 71 extending into the flow-limiting chamber 241 is provided with a second anti-rotation plane 712. The second anti-rotation plane 712 is opposite to the first anti-rotation plane 242 to prevent the regulating valve core 71 from rotating in the flow-limiting chamber 241, ensuring that the second tooth groove 711 on the regulating valve core 71 is opposite to the limiting chamber 242. Each time the limiting stud 72 rotates to the preset position, the first tooth groove 721 at its end can effectively engage with the second tooth groove 711.

[0046] The first groove 721 and the second groove 711 are arranged in a linear array or in a line along the axial direction. By marking the second groove 711 along the axial direction, the position of the control valve core 71 can be easily adjusted to ensure that the flow rate of the injection holes 81 corresponding to each injection chamber 23 is consistent. By engaging the first groove 721 with different second grooves 711, the injection speed can be adjusted. The channel formed by the diversion hole 22, the injection chamber 23, and the control chamber 24 is arranged in an array around the outer periphery of the central flow channel 21. The amount of liquid discharged from each injection hole 81 can be adjusted by each control valve core, effectively ensuring that the liquid injected into each injection hole 81 is balanced.

[0047] In this embodiment, the second toothed groove 711 of the regulating valve core 71 is preferably disposed on the second anti-rotation plane 712, and the limiting chamber 242 and the flow limiting chamber 241 are connected on the side of the first anti-rotation plane 242. Furthermore, the end face of the limiting stud 72 is preferably flat. Thus, since both the first toothed groove 721 and the second toothed groove 711 are disposed on a flat plane, the contact area when the limiting stud 72 rotates to engage with the first toothed groove 721 and the second toothed groove 711 is larger, resulting in more reliable positioning of the regulating valve core 71 and a more stable liquid flow rate ejected from the injection hole 81.

[0048] In this embodiment, the end of the diversion orifice 22 furthest from the central flow channel 21 is preferably connected to both the injection chamber 23 and the regulating chamber 24, and the cross-sectional areas of the connecting ends of the injection chamber 23, the regulating chamber 24, and the diversion orifice 22 are all equal. The flow-limiting chamber 241 is coaxially arranged with the diversion orifice 22, and the portion of the regulating valve assembly extending into the injection chamber 23 is adapted to the diversion orifice 22, that is, the axial projection of the regulating valve core 71 is substantially coincident with the axial projection of the diversion orifice 22. Setting the regulating chamber 24 at the corner position formed by the connection between the diversion orifice 22 and the injection chamber 23, on the one hand, the extension of the regulating valve core 71 changes the flow cross-sectional area at the corner position, which significantly accelerates the liquid flowing through the corner position; on the other hand, it helps to reduce the disturbance caused by the regulating valve core 71 extending into the injection chamber 23 or the diversion orifice 22, allowing the liquid to flow more smoothly to the injection orifice 81, which helps to further increase the flow rate. If the regulating valve core 71 is inserted separately into the injection chamber 23 or the diversion hole 22, the path that the water flowing through the opposite sides of the regulating valve core 71 must take will be lengthened, resulting in increased water turbulence and disturbance, which will affect the distribution of the drug solution in the injection hole 81 and the injection speed. In this embodiment, the end of the diversion hole 22 away from the central flow channel 21 is connected to both the injection chamber 23 and the regulating chamber 24, and the flow-limiting chamber 241 is coaxially arranged with the diversion hole 22, thus solving the problem that the liquid must flow through the opposite sides of the regulating valve core 71 before it can flow into the injection hole 81.

[0049] In this embodiment, the end of the regulating valve core 71 is a conical surface 713, which can guide the liquid at the corner position formed by the connection between the diversion hole 22 and the injection chamber 23.

[0050] Furthermore, the central flow channel 21 is arranged parallel to the injection chamber 23, and the diversion hole 22 is arranged from the central flow channel 21 in a direction away from the injection hole 81, which avoids interference between the extension and retraction adjustment of the regulating valve group and the positioning injection of the needleless injection head 8.

[0051] In this embodiment, the injection chamber 23 includes a mounting chamber 231 and a flow guiding chamber 232, with the needleless injection head 8 disposed within the mounting chamber 231. The flow guiding chamber 232 connects the mounting chamber 231 with the diversion hole 22 and the adjustment chamber 24. The cross-sectional area of ​​the diversion hole 22 is smaller than the cross-sectional area of ​​the central flow channel 21 and not smaller than the cross-sectional area of ​​the flow guiding chamber 232. Preferably, the cross-sectional area of ​​the diversion hole 22 is equal to the cross-sectional area of ​​the flow guiding chamber 232. See also... Figure 7The needleless injection head 8 and the injection port 81 specifically include a first chamber 811, a second chamber 812, and a third chamber 813. The first chamber 811 communicates with the outside, the second chamber 812 connects the first chamber 811 and the third chamber 813, and the third chamber 813 communicates with the distribution chamber 21. The cross-sectional areas of the first chamber 811 and the third chamber 813 are constant, which makes it easier to process and shape, and makes it easier to stabilize the injection effect. Moreover, the cross-sectional area of ​​the first chamber 811 is smaller than that of the third chamber 813. The cross-sectional area of ​​the second chamber 812 gradually increases in the direction away from the first chamber 811, so that the flow cross-sectional area of ​​the liquid when flowing through the second chamber 812 becomes smaller, which promotes the increase of flow rate.

[0052] In addition, combined Figures 8 to 17 This utility model also discloses an embodiment of a needleless injector, including a liquid-flowing body 1, a liquid outlet valve 3, a first piston 4, a liquid inlet valve 5, a liquid inlet connector 6, and the aforementioned flow rate adjustable diversion injection device. The liquid-flowing body 1 is provided with a liquid outlet chamber 11, a transition chamber 12, a power chamber 13, and a liquid inlet chamber 14. The transition chamber 12 is used for pre-filling with drug solution. The liquid inlet chamber 14 is intersected with the transition chamber 12. The liquid outlet chamber 11 and the power chamber 13 are respectively located at both ends of the transition chamber 12. The liquid outlet valve 3 is located at... The liquid outlet chamber 11 contains the liquid inlet valve 5, which is located within the liquid inlet chamber 14. The first piston 4 is located within the power chamber 13 and is connected to a power source. The flow rate adjustable diversion injection device includes an injection diversion connector 2 and a regulating valve group. The injection diversion connector 2 is sealed to the liquid inlet body 1. The injection diversion connector 2 has a central flow channel 21, a diversion hole 22, an injection chamber 23, and a regulating chamber 24. The central flow channel 21 communicates with the liquid outlet chamber 11, and the diversion hole 22 is located within the liquid outlet chamber 14. The outer periphery of the central flow channel 21 is arranged in an array. The injection chamber 23 and the regulating chamber 24 are both corresponding to the diversion hole 22. One end of the diversion hole 22 is connected to the central flow channel 21, and the other end is connected to at least one of the injection chamber 23 and the regulating chamber 24. The regulating chamber 24 is arranged crosswise with at least one of the injection chamber 23 and the diversion hole 22. The injection chamber 23 is coaxially connected to the injection hole 81 that connects to the outside. The regulating valve group is located in the regulating chamber 24, and the length of the regulating valve group extending toward the injection chamber 23 or the diversion hole 22 is adjustable. The liquid inlet connector 6 is sealed to the liquid inlet body 1. The liquid inlet connector 6 is provided with a liquid inlet channel that selectively communicates with the liquid inlet chamber 14. The first piston 4 reciprocates in the power chamber 13 to drive the liquid outlet valve 3 to communicate the transition chamber 12 with the central flow channel 21, or to drive the liquid inlet valve 5 to communicate the liquid inlet channel with the transition chamber 12.

[0053] In this embodiment, the needleless injector has an inlet connector 6 and an injection diverter connector 2 on the liquid inlet body 1. The liquid outlet valve 3 located in the liquid outlet chamber 11 controls the opening and closing of the transition chamber 12 of the liquid inlet body 1 and the central flow channel 21 in the injection diverter connector 2. The liquid inlet valve 5 located in the liquid inlet chamber 14 controls the opening and closing of the liquid inlet channel of the transition chamber 12 of the liquid inlet body 1 and the liquid inlet connector 6. By arranging diverter holes 22 and injection chambers 23 coaxially connected to the injection holes 81 that communicate with the outside world on the outer periphery of the central flow channel 21 of the injection diverter connector 2, the diverter holes 22 are connected to the corresponding injection chambers 23. Driven by the first piston 4, the liquid in each injection chamber 23 can be simultaneously ejected into the injection hole 81, achieving higher injection efficiency.

[0054] The dispensing valve 3 in this embodiment includes a first valve core 31 and a first elastic reset member 32. The injection diverter 2 has a first abutment cavity 25, which is coaxially arranged with the central flow channel 21. The first elastic reset member 32 is disposed within the first abutment cavity 25. The first valve core 32 has a second abutment cavity 322 disposed opposite to the first abutment cavity 25, and the first elastic reset member 32 abuts against the second abutment cavity 322. When the pressure of the liquid in the transition cavity 12 on the first valve core 32 is less than the elastic force of the first elastic reset member 32, the first valve core 32 will move towards the transition cavity 12, or remain in a state of blocking the transition cavity 12.

[0055] The outer peripheral surface of the first valve core has a first gap with the inner wall of the liquid outlet chamber 11. The first valve core is provided with a first liquid guide groove or a first liquid guide hole that connects the first gap with the second abutment chamber. The first liquid guide groove is positioned to open toward the injection diversion connector 2. Figures 15 to 17 The first valve core 32 has a first protruding ring 323 and a second protruding ring 324 at its two ends, respectively. Both the first protruding ring 323 and the second protruding ring 324 protrude outwards from the outer peripheral surface of the first valve core 32 and are adapted to the liquid outlet chamber 11. The first protruding ring 323 and the second protruding ring 324 play a guiding role when the first valve core 32 moves axially, helping to improve the stability of the first valve core 32 moving axially, thereby making the injection flow more stable.

[0056] The first liquid guiding groove 321 axially penetrates the axial groove of the first convex ring 323 and the radial groove communicating with the second abutment cavity 322. The second convex ring 324 is provided with a second liquid guiding groove 325, which axially penetrates the second convex ring 324 and communicates with the first gap a, so that the liquid medicine in the transition cavity 12 can enter the first gap a.

[0057] The first liquid guiding groove 321 and the second liquid guiding groove 325 are preferably tangent to the outer peripheral surface of the first valve core 32 in order to reduce unnecessary disturbances during the flow of the liquid.

[0058] In this embodiment, the end face of the first valve core 32 opposite to the transition cavity 12 is provided with a first sealing groove 326, and a first sealing element for sealing the transition cavity 12 is provided in the first sealing groove 326. When the first sealing element abuts against the injection cavity, the first gap a is disconnected from the transition cavity 12. When the pressure of the liquid in the transition cavity 12 increases, driving the first valve core 32 away from the transition cavity 12, the first sealing element releases the seal on the transition cavity 12, and the first gap a communicates with the transition cavity 12. Since the cross-sectional area of ​​the transition cavity 12 is smaller than the cross-sectional area of ​​the liquid outlet 11, at the instant the transition cavity 12 communicates with the first gap a, the pressure acting on the surface of the first valve core 32 increases with the increase of the contact area with the liquid, helping to push the first valve core 32 to move quickly to abut against the injection diverter 2, thereby accelerating the injection speed.

[0059] In this embodiment, the power chamber 13 of the liquid inlet body 1 is preferably coaxially arranged with the transition chamber 12 and the outlet chamber 11, so that the cross-sectional area of ​​the transition chamber 12 is smaller than that of the power chamber 13. During injection, the pre-filled liquid in the transition chamber 12 can more easily push the first valve core 32 to move at high speed, resulting in a greater initial velocity of the liquid and helping to increase the injection speed. The power chamber 13 is provided with a first piston 4, which reciprocates within the power chamber 13 to drive the liquid in the transition chamber 12 into the outlet chamber 11, or the liquid in the inlet chamber 14 into the transition chamber 12.

[0060] In this embodiment, the power chamber 13, the transition chamber 12, the liquid outlet chamber 11, and the injection port 81 are coaxially arranged. The liquid inlet chamber 14 is intersecting and communicating with the transition chamber 12, and is used to inject the drug solution into the transition chamber 12. The liquid inlet connector 6 is provided with a liquid inlet channel 61 communicating with the liquid inlet chamber 14. In this embodiment, the liquid inlet connector 6 is a Luer connector, which is provided with a sealing ring that seals against the inner wall of the liquid inlet chamber 14. The liquid inlet valve 5 specifically includes a second valve core 51 and a second elastic reset member 52. In this embodiment, the first valve core 32 and the second valve core 51 preferably adopt the same structure, which is more convenient for assembly. Specifically, the outer peripheral surface of the second valve core 51 has a second gap b with the inner wall of the liquid inlet chamber 14. The second gap b communicates with the transition chamber 12. The second valve core 51 has a third abutment chamber 511 on the side opposite to the liquid inlet connector 6. The liquid inlet chamber 14 has a fourth abutment chamber 141 that is opposite to the third abutment chamber 511. The second elastic reset member 52 abuts against the third abutment chamber 511 and the fourth abutment chamber 141, which can drive the second valve core 51 to move closer to the liquid inlet channel 61 and disconnect the second gap b from the liquid inlet channel 61. The second valve core 51 has a third protruding ring and a fourth protruding ring at its two ends, respectively. Both the third and fourth protruding rings protrude outwards from the outer circumferential surface of the second valve core 51 and are adapted to the liquid inlet chamber 14. A third liquid guide groove 512 is provided at the end of the second valve core 51 away from the transition chamber 12. The third liquid guide groove 512 axially penetrates the third protruding ring and communicates with the third abutment chamber 511 and the second gap b. A fourth liquid guide groove 513 is provided on the fourth protruding ring. The fourth liquid guide groove 513 axially penetrates the fourth protruding ring and communicates with the second gap b. A second sealing groove is provided on the end face of the second valve core opposite to the liquid inlet channel 61. A second sealing element for sealing the liquid inlet channel 61 is provided in the second sealing groove.

[0061] In this embodiment, the liquid inlet body 1 of the needleless injector is preferably made of medical-grade plastic, which makes the internal state of the needleless injector visible. Compared with metal materials, it reduces processing and material costs. The needleless injection head 8, the liquid inlet connector 6, etc. are also preferably made of medical-grade plastic, so that they can be used as disposable consumables, avoiding repeated cleaning and sterilization operations, and avoiding the risk of cross-infection caused by improper repeated cleaning and sterilization operations.

[0062] In this embodiment, both the first elastic reset member 32 and the second elastic reset member 52 are preferably compression springs.

[0063] In this embodiment, the inlet connector 6 is further provided with an inlet tube 91, and a second piston 92 is provided inside the inlet tube 91. The inlet tube 91, the second piston 92, and the inlet connector 6 constitute a conventional syringe. When the second piston 92 draws the liquid into the inlet tube 91, the second piston 92 seals the liquid in the inlet tube 91 by inserting the inlet tube 91 into the inlet chamber 14 of the liquid-conducting body 1. By pushing the second piston 92, pressure can be applied to the liquid in the inlet tube 91, and the second valve core 51 overcomes the pressure of the second elastic reset member 52 and moves away from the inlet connector 6. The second gap b communicates with the inlet channel 61, thereby achieving pre-filling of the transition chamber 12 with liquid. In addition, the liquid in the inlet channel 61 can also be drawn into the transition chamber 12 by pulling the first piston 4.

[0064] The operation of the needleless injector according to the embodiments of this utility model will be described below with reference to the accompanying drawings.

[0065] Liquid extraction status: such as Figure 11 As shown, the first piston 4 moves to the right, and a negative pressure is formed in the transition chamber 12. The first valve core 32 moves to the right under the suction force of the transition chamber 12 and the force of the first elastic reset member 32 until it is limited by the liquid-passing body 1. At the same time, the second valve core 51 moves downward under the action of negative pressure, overcoming the elastic force of the second elastic reset member 52. The liquid in the liquid inlet channel 61 enters the transition chamber 12 through the second gap b.

[0066] Injection status: such as Figure 12 As shown, the first piston 4 moves to the left, pushing the liquid medicine in the transition chamber 12 to gather to the left and creating a thrust on the first valve core 32. The first valve core 32 moves to the left until it is limited by the injection diversion connector 2. The liquid medicine flows into the central flow channel 21 of the injection diversion connector 2 through the second liquid guide groove 325, the first gap a, and the first liquid guide groove 321. It is then distributed to each injection chamber 23 through the diversion hole 22 of the injection diversion connector 2 and ejected through the injection hole 81. At the same time, under the hydraulic action in the transition chamber 12 and the elastic force of the second elastic reset member 52, the second valve core 51 moves upward until it is limited by the Luer connector. At this time, the liquid medicine cannot flow into the transition chamber 12 through the second gap b.

[0067] The above-disclosed embodiment is merely a preferred embodiment of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the claims of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A flow rate adjustable split shot device, characterized by, Including injection manifold and regulating valve assembly, The injection diversion connector is provided with a central flow channel, a diversion hole, an injection chamber, and an adjustment chamber. The diversion holes are arranged in an array on the outer periphery of the central flow channel. The injection chamber and the adjustment chamber are respectively arranged corresponding to the diversion holes. One end of the diversion hole is connected to the central flow channel, and the other end is connected to at least one of the injection chamber and the adjustment chamber. The adjustment chamber is arranged intersectingly with at least one of the injection chamber and the diversion hole. The injection chamber is coaxially connected to the injection hole that connects to the outside. The regulating valve assembly is located in the regulating chamber, and the length of the regulating valve assembly extending toward the injection chamber or the diversion orifice is adjustable.

2. The adjustable flow rate split shot device of claim 1, wherein, The regulating chamber includes a flow-limiting chamber and a limiting chamber. The regulating valve assembly includes a regulating valve core and a limiting stud. The regulating valve core is sealed to the flow-limiting chamber, and the limiting stud is connected to the limiting chamber. The end face of the limiting stud is provided with a first tooth groove, and the side wall of the regulating valve core is provided with a second tooth groove opposite to the limiting chamber. When the limiting stud is rotated to a preset position, the first tooth groove and the second tooth groove engage. The flow-limiting chamber is provided with a first anti-rotation plane, and the regulating valve core extending into the side wall of the flow-limiting chamber is provided with a second anti-rotation plane, the second anti-rotation plane being opposite to the first anti-rotation plane.

3. The adjustable flow rate split shot device of claim 2, wherein, The end of the diversion orifice away from the central flow channel is connected to both the injection chamber and the regulating chamber. The flow limiting chamber is coaxially arranged with the diversion orifice, and the portion of the regulating valve assembly extending into the injection chamber is adapted to the diversion orifice.

4. The adjustable flow rate split shot device of claim 1 or 3, wherein, The central flow channel is arranged parallel to the injection chamber, and the diversion hole is arranged from the central flow channel in a direction away from the injection hole.

5. The adjustable flow rate split shot device of claim 1, wherein, It also includes a needleless injection head, the injection hole being disposed within the needleless injection head, the injection chamber including an installation chamber and a flow guiding chamber, the flow guiding chamber connecting the installation chamber with the flow diversion hole and the adjustment chamber, the cross-sectional area of ​​the flow diversion hole being smaller than the cross-sectional area of ​​the central flow channel and not smaller than the cross-sectional area of ​​the flow guiding chamber, and the needleless injection head being disposed within the installation chamber.

6. The adjustable flow rate split shot device of claim 2, wherein, The second tooth groove is located on the second anti-rotation plane, and the second tooth groove is arranged in an array along the axial direction.

7. The adjustable flow rate split shot device of claim 2, wherein, The end of the regulating valve core opposite to the diversion hole is a conical surface.

8. A needle-free injector characterized by, Includes a liquid-passing body, a liquid outlet valve, a first piston, and the flow rate adjustable diversion injection device as described in any one of claims 1 to 7. The liquid-conducting body is provided with a transition chamber, and a liquid outlet chamber and a power chamber respectively located at both ends of the transition chamber. The transition chamber is used for pre-filling with liquid. The injection diverter is sealed to the liquid-conducting body, and the central flow channel communicates with the liquid outlet chamber. One end of the liquid outlet valve abuts against the injection diverter, and the other end is telescopically located at the adjacent end of the liquid outlet chamber and the transition chamber. The first piston is located in the power chamber and is connected to a power source to drive the liquid in the transition chamber to squeeze the liquid outlet valve, so that the transition chamber communicates with or disconnects from the central flow channel.

9. The needle-free injector of claim 8, wherein, The dispensing valve includes a first valve core and a first elastic reset member. The first valve core is located at one end of the dispensing chamber near the transition chamber. The central flow channel has a first abutment cavity opposite to the dispensing valve. The first valve core has a second abutment cavity opposite to the first abutment cavity. The two ends of the first elastic reset member abut against the first abutment cavity and the second abutment cavity, respectively. The outer peripheral surface of the first valve core has a first gap with the inner wall of the dispensing chamber. The first valve core has a first liquid guide groove or a first liquid guide hole that connects the first gap with the second abutment cavity. The first liquid guide groove is disposed toward the opening of the injection diverter connector.

10. The needle-free injector of claim 9, wherein, It also includes an inlet valve and an inlet connector. The liquid-conducting body is further provided with an inlet chamber that crosses and communicates with the transition chamber. The inlet connector is provided with an inlet channel that communicates with the inlet chamber. The inlet valve includes a second valve core and a second elastic reset member. The outer peripheral surface of the second valve core has a second gap with the inner wall of the inlet chamber. The second gap communicates with the transition chamber. The side of the second valve core facing away from the inlet connector is provided with a third abutment cavity. The inlet chamber is provided with a fourth abutment cavity that is opposite to the third abutment cavity. The second elastic reset member abuts against the third abutment cavity and the fourth abutment cavity, which can drive the second valve core to move towards the inlet channel and disconnect the second gap from the inlet channel.

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