Needleless injector

Abstract

The invention relates to the technical field of medical instruments, and discloses a needleless injector which comprises a liquid passing main body, an injection shunt joint, an adjusting valve group, a liquid outlet valve, a liquid inlet valve, a liquid inlet joint and a first piston, the liquid passing main body is provided with a transition cavity, a liquid inlet cavity, a liquid outlet cavity and a power cavity, the liquid outlet valve is arranged in the liquid outlet cavity, the liquid inlet valve is arranged in the liquid inlet cavity, and the liquid inlet joint is arranged in the liquid inlet cavity. The first piston is arranged in the power cavity; the injection shunting joint is in sealed connection with the liquid passing main body, the injection shunting joint is provided with a central flow channel, a shunting hole, an injection chamber and an adjusting chamber, one end of the shunting hole is communicated with the central flow channel, and the other end of the shunting hole is communicated with at least one of the injection chamber and the adjusting chamber; the adjusting valve group is arranged in the adjusting cavity, and the length of the adjusting valve group extending towards the injection cavity or the flow dividing hole can be adjusted. The injection dosage in unit time can be adjusted, and the injection efficiency can be higher.

Description

Technical Field

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

[0002] Needle-free syringes do not require needles. Instead, they are medical devices that apply high pressure to liquid medicine so that it can be injected into the patient's skin, subcutaneous tissue or muscle through a microhole at the end. This can greatly reduce the pain and psychological burden of injections.

[0003] Most of the current needle-free syringes are single-head injections, which can only achieve small doses of injection per unit time, with low injection efficiency, and the injection dose per unit time, that is, the injection speed, cannot be adjusted.

[0004] Therefore, it is necessary to provide a needle-free syringe with an adjustable injection dose per unit time and higher injection efficiency. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a needle-free syringe, the injection dose per unit time of which is adjustable and can achieve higher injection efficiency.

[0006] In order to solve the above technical problems, the present invention provides a needle-free syringe, comprising a liquid-passing body, an injection diverter joint, a regulating valve group, a liquid outlet valve, a liquid inlet valve, a liquid inlet joint and a first piston.

[0007] The liquid-passing body is provided with a transition chamber, a liquid inlet chamber intersecting and communicating with the transition chamber, and a liquid outlet chamber and a power chamber respectively provided at both ends of the transition chamber. The transition chamber is used for pre-filling the liquid, the liquid outlet valve is provided in the liquid outlet chamber, the liquid inlet valve is provided in the liquid inlet chamber, and a first piston is provided in the power chamber, and the first piston is connected to a power source.

[0008] The injection diverter joint is sealed and connected to the liquid-passing main body. The injection diverter joint is provided with a central flow channel, a diverter hole, an injection chamber, and a regulating chamber. The central flow channel is communicated with the liquid outlet chamber. The diverter holes are arranged in an array on the periphery of the central flow channel. The injection chamber and the regulating chamber are both arranged corresponding to the diverter holes. One end of the diverter hole is communicated with the central flow channel, and the other end is communicated with at least one of the injection chamber and the regulating chamber. The regulating chamber is cross-arranged with at least one of the injection chamber and the diverter hole. The injection chamber is coaxially communicated with the injection hole communicating with the outside world.

[0009] The regulating valve group is arranged in the regulating chamber, and the length of the regulating valve group extending toward the injection chamber or the diversion hole is adjustable;

[0010] The liquid inlet joint is sealedly connected to the liquid-passing body, and the liquid inlet joint is provided with a liquid inlet channel selectively communicating with the liquid inlet cavity;

[0011] The first piston reciprocates in the power chamber to drive the liquid outlet valve to connect the transition chamber with the central flow channel, or drives the liquid inlet valve to connect the liquid inlet channel with the transition chamber.

[0012] As an improvement of the above-mentioned scheme, the regulating chamber includes a flow limiting chamber and a position limiting chamber, the regulating valve group includes a regulating valve core and a position limiting stud, the regulating valve core is sealed and connected to the flow limiting chamber, the position limiting stud is connected to the position limiting chamber, the end face of the position 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 position limiting chamber, and when the position limiting stud is rotated to a preset position, the first tooth groove is engaged with the second tooth groove.

[0013] As an improvement to the above solution, the flow limiting chamber is provided with a first anti-rotation plane, and the side wall of the regulating valve core extending into the flow limiting chamber is provided with a second anti-rotation plane, which is opposite to the first anti-rotation plane.

[0014] As an improvement of the above solution, the end of the diverter hole away from the central flow channel is connected to the injection chamber and the regulating chamber, the flow limiting chamber is coaxially arranged with the diverter hole, and the part of the regulating valve group extending toward the injection chamber is adapted to the diverter hole.

[0015] As an improvement to the above solution, the central flow channel is arranged in parallel with the injection chamber, and the diversion hole is arranged from the central flow channel in a direction away from the injection hole.

[0016] As an improvement of the above scheme, it also includes a needle-free injection head, the injection hole is arranged in the needle-free injection head, the injection chamber includes a mounting chamber and a guide chamber, the guide chamber connects the mounting 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 is not smaller than the cross-sectional area of ​​the guide chamber, and the needle-free injection head is arranged in the mounting chamber.

[0017] As an improvement of the above scheme, the injection hole is coaxially arranged with the guide cavity, and the injection hole includes a first chamber, a second chamber, and a third chamber. The first chamber is communicated with the outside, the second chamber connects the first chamber and the third chamber, and the third chamber has a constant cross-sectional area. The cross-sectional area of ​​the first chamber is smaller than the cross-sectional area of ​​the third chamber, and the cross-sectional area of ​​the second chamber gradually increases in the direction away from the first chamber.

[0018] As an improvement to the above solution, the liquid outlet valve includes a first valve core and a first elastic return member, the first valve core is provided at one end of the liquid outlet chamber close to the transition chamber, the central flow channel is provided with a first abutting chamber opposite to the liquid outlet valve, the first valve core is provided with a second abutting chamber arranged opposite to the first abutting chamber, the two ends of the first elastic return member respectively abut against the first abutting chamber and the second abutting chamber, the outer peripheral surface of the first valve core and the inner side wall of the liquid outlet chamber have a first gap, the first valve core is provided with a first liquid guide groove or a first liquid guide hole connecting the first gap and the second abutting chamber, and the first liquid guide groove is provided toward the injection diversion joint opening;

[0019] The liquid inlet valve includes a second valve core and a second elastic return member. A second gap is formed between the outer peripheral surface of the second valve core and the inner side wall of the liquid inlet cavity. The second gap is communicated with the transition cavity. The second valve core is provided with a third abutment cavity on the side facing away from the liquid inlet joint. A fourth abutment cavity is provided in the liquid inlet cavity, which is arranged opposite to the third abutment cavity. The second elastic return member abuts against the third and fourth abutment cavities, and can drive the second valve core to move toward the direction close to the liquid inlet channel and disconnect the second gap from the liquid inlet channel.

[0020] As an improvement to the above solution, a first convex ring and a second convex ring are respectively provided at both ends of the first valve core, the first convex ring and the second convex ring are both protruding toward the outer circumferential surface of the first valve core and are both adapted to the liquid outlet cavity, the first liquid guide groove axially penetrates the first convex ring and is in communication with the second abutting cavity, and the second convex ring is provided with a second liquid guide groove axially penetrates the second convex ring and is in communication with the first gap;

[0021] A first sealing groove is provided on the end surface of the first valve core opposite to the transition cavity, and a first sealing member for sealing the transition cavity is provided in the sealing groove;

[0022] A third convex ring and a fourth convex ring are respectively provided at both ends of the second valve core. The third convex ring and the fourth convex ring are both protruding toward the outer peripheral surface of the second valve core and are both adapted to the liquid inlet cavity. A third liquid guide groove is provided at one end of the second valve core away from the transition cavity. The third liquid guide groove axially penetrates the third convex ring and is in communication with the third abutting cavity and the second gap. A fourth liquid guide groove is provided on the fourth convex ring. The fourth liquid guide groove axially penetrates the fourth convex ring and is in communication with the second gap.

[0023] A second sealing groove is provided on the end surface of the second valve core opposite to the liquid inlet channel, and a second sealing member for sealing the liquid inlet channel is provided in the second sealing groove.

[0024] As an improvement of the above solution, the central flow channel is coaxially arranged with the transition chamber, the power chamber, and the liquid outlet chamber, the cross-sectional area of ​​the transition chamber is smaller than the cross-sectional area of ​​the liquid outlet chamber, and the cross-sectional area of ​​the transition chamber is smaller than the cross-sectional area of ​​the power chamber.

[0025] The implementation of the present invention has the following beneficial effects:

[0026] The injection dosage per unit time is adjustable, and a higher injection efficiency can be achieved.

[0027] The present invention discloses a needle-free syringe, which is provided with a liquid inlet joint and an injection diverter joint on a liquid-passing body, controls the connection and disconnection between the transition chamber of the liquid-passing body and the central flow channel in the injection diverter joint by a liquid outlet valve located in the liquid outlet chamber, controls the connection and disconnection between the transition chamber of the liquid-passing body and the liquid inlet channel of the liquid inlet joint by a liquid inlet valve located in the liquid inlet chamber, arranges diverter holes in an array on the periphery of the central flow channel of the injection diverter joint, and injection chambers coaxially communicated with the injection holes communicating with the outside world, the diverter holes are communicated with the corresponding injection chambers, and the liquid in each injection chamber can be simultaneously ejected to the injection hole by the drive of the first piston, thereby achieving higher injection efficiency; at the same time, the injection diverter joint is provided with an adjusting chamber corresponding to the diverter hole, and the diverter holes are connected to the injection chamber. One end of the hole is connected to the central flow channel, and the other end is connected to at least one of the injection chamber and the regulating chamber, that is, the end of the diversion hole is connected to the injection chamber, or is connected to the regulating chamber, or is connected to the injection chamber and the regulating chamber at the same time. The regulating chamber is cross-arranged with the injection chamber and at least one of the diversion hole, and the injection chamber is coaxially connected to the injection hole connected to the outside world; the regulating valve group is arranged in the regulating chamber, and the length of the regulating valve group extending toward the injection chamber or the diversion hole can be adjusted. When the first piston moves to in the power chamber, it will change the water cross-sectional area of ​​the injection chamber and / or the diversion hole chamber, control the speed of liquid ejected from the injection hole, and realize the injection speed adjustment of the injection hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic structural diagram of an embodiment of a needle-free syringe of the present invention;

[0029] Figure 2 yes Figure 1 A cross-sectional view of the liquid-passing body through the symmetry plane;

[0030] Figure 3 yes Figure 1 Cross-sectional view through the plane of symmetry;

[0031] Figure 4 yes Figure 3 Schematic diagram of the liquid pumping state structure;

[0032] Figure 5 yes Figure 3Schematic diagram of the injection state structure;

[0033] Figure 6 yes Figure 3 A schematic diagram of the enlarged structure of part A;

[0034] Figure 7 yes Figure 3 Schematic diagram of the enlarged structure of part B;

[0035] Figure 8 This is a schematic diagram of the structure of one end of the injection diverter joint;

[0036] Figure 9 This is a schematic diagram of the structure of the other end of the injection diversion joint;

[0037] Figure 10 Cross-sectional view of the injection manifold;

[0038] Figure 11 It is a structural diagram of the injection diverter joint and the regulating valve group;

[0039] Figure 12 yes Figure 11 Cross-sectional view through CC section;

[0040] Figure 13 It is the front view and side view of the regulating valve core;

[0041] Figure 14 It is a schematic diagram of the structure of the needle-free injection head;

[0042] Figure 15 is a cross-sectional view of the first valve core through the symmetry plane;

[0043] Figure 16 yes Figure 15 A left side view of the first valve core is shown;

[0044] Figure 17 yes Figure 15 A right side view of the first valve core is shown. DETAILED DESCRIPTION

[0045] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention will be described in further detail below with reference to the accompanying drawings.

[0046] like Figures 1 to 17As shown, the present invention discloses an embodiment of a needle-free syringe, comprising a liquid-passing body 1, an injection diverter joint 2, a liquid outlet valve 3, a first piston 4, a liquid inlet valve 5, a liquid inlet joint 6 and a regulating valve group. The liquid-passing 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 the liquid, the liquid inlet chamber 14 cross-connects with the transition chamber 12, the liquid outlet chamber 11 and the power chamber 13 are respectively provided at both ends of the transition chamber 12, the liquid outlet valve 3 is provided in the liquid outlet chamber 11, the liquid inlet valve 5 is provided in the liquid inlet chamber 14, the first piston 4 is provided in the power chamber 13, and the first piston 4 is connected to a power source; see Figures 8 to 13 The injection diverter joint 2 is sealed and connected to the liquid main body 1. The injection diverter joint 2 is provided with a central flow channel 21, a diverter hole 22, an injection chamber 23, and an adjusting chamber 24. The central flow channel 21 is communicated with the liquid outlet cavity 11. The diverter holes 22 are arranged in an array on the periphery of the central flow channel 21. The injection chamber 23 and the adjusting chamber 24 are both arranged corresponding to the diverter hole 22. One end of the diverter hole 22 is communicated with the central flow channel 21, and the other end is communicated with at least one of the injection chamber 23 and the adjusting chamber 24. The adjusting chamber 24 is connected to the injection chamber 23 and the diverter hole 22. At least one of them is cross-arranged, and the injection chamber 23 is coaxially communicated with the injection hole 81 communicating with the outside world; the regulating valve group is arranged in the regulating chamber 24, and the length of the regulating valve group extending toward the injection chamber 23 or the diversion hole 22 can be adjusted; the liquid inlet joint 6 is sealed with the liquid-passing body 1, and the liquid inlet joint 6 is provided with a liquid inlet channel selectively communicated with the liquid inlet chamber 14; the first piston 4 moves back and forth in the power chamber 13 to drive the liquid outlet valve 3 to make the transition chamber 12 communicate with the central flow channel 21, or drive the liquid inlet valve 5 to make the liquid inlet channel communicate with the transition chamber 12.

[0047] In this embodiment, a liquid inlet connector 6 and an injection diverter connector 2 are provided on the liquid passage main body 1, and the connection and disconnection between the transition chamber 12 of the liquid passage main body 1 and the central flow channel 21 in the injection diverter connector 2 is controlled by the liquid outlet valve 3 located in the liquid outlet chamber 11, and the connection and disconnection between the transition chamber 12 of the liquid passage main body 1 and the liquid inlet channel of the liquid inlet connector 6 is controlled by the liquid inlet valve 5 located in the liquid inlet chamber 14. By providing a diverter hole 22 in an array on the periphery of the central flow channel 21 of the injection diverter connector 2 and an injection chamber 23 coaxially connected to the injection hole 81 connected to the outside, the diverter hole 22 is connected to the corresponding injection chamber 23, and the liquid in each injection chamber 23 can be simultaneously ejected to the injection hole 81 by the drive of the first piston 4, thereby achieving higher injection efficiency; at the same time, the injection diverter connector 2 is provided with an adjusting chamber 24 corresponding to the diverter hole 22, and one end of the diverter hole 22 is connected to the injection hole 81 connected to the outside. The central flow channel 21 is connected, and the other end is connected to at least one of the injection chamber 23 and the regulating chamber 24, that is, the end of the diverter hole 22 is connected to the injection chamber 23, or is connected to the regulating chamber 24, or is connected to the injection chamber 23 and the regulating chamber 24 at the same time. The regulating chamber 24 is cross-arranged with at least one of the injection chamber 23 and the diverter hole 22, and the injection chamber 23 is coaxially connected to the injection hole 81 connected to the outside world; the regulating valve group is arranged in the regulating chamber 24, and the length of the regulating valve group extending toward the injection chamber 23 or the diverter hole 22 can be adjusted. When the first piston 4 moves to in the power chamber 13, it will change the water cross-sectional area of ​​the injection chamber 23 and / or the diverter hole 22, control the speed of the liquid ejected from the injection hole 81, and realize the injection speed adjustment of the injection hole 81.

[0048] The regulating chamber 24 of the injection diversion joint 2 of this embodiment specifically includes a flow limiting chamber 241 and a limit chamber 242, and the regulating valve group includes a regulating valve core 71 and a limit stud 72. The regulating valve core 71 is sealed and connected to the flow limiting chamber 241, and the limit stud 72 is connected to the limit chamber 242. The end face of the limit 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 limit chamber 242. When the limit stud 72 is rotated to a preset position, the first tooth groove 721 is engaged with the second tooth groove 711 to prevent the regulating valve core 71 from axial movement, so that the regulating valve core 71 can relatively maintain the current extension amount to 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.

[0049] In addition, the inner wall of the flow limiting chamber 241 is provided with a first stop plane 242, and the outer wall of the regulating valve core 71 extending into the flow limiting chamber 241 is provided with a second stop plane 712. The second stop plane 712 is opposite to the first stop 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, and each time the limiting stud 72 is rotated to the preset position, the first tooth groove 721 at its end can effectively engage with the second tooth groove 711.

[0050] The first tooth grooves 721 and the second tooth grooves 711 are arranged in a linear array or in a straight line along the axial direction. By setting marks on the second tooth grooves 711 along the axial direction, the position of the regulating 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 tooth grooves 721 with different second tooth grooves 711, the injection speed can be adjusted. The channels formed by the diverter holes 22, the injection chamber 23, and the regulating chamber 24 are arranged in an array on the periphery of the central flow channel 21. The size of the liquid output from each injection hole 81 can be adjusted by each regulating valve core, effectively ensuring that the liquid injected by each injection hole 81 is balanced.

[0051] In this embodiment, the second tooth groove 711 of the regulating valve core 71 is preferably disposed on the second anti-rotation plane 712, and the position-limiting chamber 242 is connected to the side of the flow-limiting chamber 241 where the first anti-rotation plane 242 is disposed. Furthermore, the end surface of the position-limiting stud 72 is preferably flat. Thus, the first and second tooth grooves 721, 711 are both disposed on a plane. This increases the contact area when the position-limiting stud 72 rotates until the first and second tooth grooves 721, 711, engage, thereby ensuring more reliable positioning of the regulating valve core 71 and stabilizing the flow rate of the liquid ejected from the injection port 81.

[0052] In this embodiment, the end of the diverter hole 22 away 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 connected ends of the injection chamber 23, the regulating chamber 24, and the diverter hole 22 are all equal. The flow limiting chamber 241 is coaxially arranged with the diverter hole 22, and the portion of the regulating valve assembly extending into the injection chamber 23 is adapted to the diverter hole 22, that is, the axial projection of the regulating valve core 71 substantially coincides with the axial projection of the diverter hole 22. The regulating chamber 24 is arranged at the corner formed by the connection between the diverter hole 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, significantly accelerating 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 diverter hole 22, allowing the liquid to flow more smoothly to the injection hole 81, thereby further increasing the flow rate. If the regulating valve core 71 were extended independently into the injection chamber 23 or the diverter hole 22, the path bypassed by water flowing sequentially through opposite sides of the regulating valve core 71 would be lengthened, causing increased tumbling and disturbance of the water flow, affecting the distribution of the liquid medicine at the injection hole 81 and the injection speed of the liquid medicine. However, in this embodiment, the end of the diverter hole 22 remote 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 diverter hole 22. This solves the problem of liquid having to flow sequentially through opposite sides of the regulating valve core 71 before it can reach the injection hole 81.

[0053] The end of the regulating valve core 71 of this embodiment is a conical surface 713 , which can guide the liquid at the corner formed by the connection between the diversion hole 22 and the injection chamber 23 .

[0054] In addition, 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, thereby avoiding interference between the telescopic adjustment of the regulating valve group and the positioning injection of the needle-free injection head 8.

[0055] The injection chamber 23 of this embodiment includes a mounting chamber 231 and a guide chamber 232. The needle-free injection head 8 is disposed in the mounting chamber 231. The guide chamber 232 connects the mounting chamber 231 with the diverter hole 22 and the regulating chamber 24. The cross-sectional area of ​​the diverter hole 22 is smaller than the cross-sectional area of ​​the central flow channel 21, and is not smaller than the cross-sectional area of ​​the guide chamber 232. The cross-sectional area of ​​the diverter hole 22 is preferably equal to the cross-sectional area of ​​the guide chamber 232. Figure 14The needle-free injection head 8 and the injection hole 81 specifically include a first chamber 811, a second chamber 812, and a third chamber 813. The first chamber 811 is connected to the outside, the second chamber 812 connects the first chamber 811 and the third chamber 813, and the third chamber 813 is connected to the distribution chamber 21. The cross-sectional areas of the first chamber 811 and the third chamber 813 are constant, which is more convenient for processing and molding, and more convenient for stabilizing the injection effect. The cross-sectional area of ​​the first chamber 811 is smaller than the cross-sectional area 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. The flow cross-sectional area of ​​the liquid medicine becomes smaller when it flows through the second chamber 812, which promotes the increase of flow rate.

[0056] The liquid outlet valve 3 of this embodiment includes a first valve core 31 and a first elastic return member 32. The injection diversion joint 2 is provided with a first abutment cavity 25, which is coaxially arranged with the central flow channel 21. A first elastic return member 32 is disposed in the first abutment cavity 25. The first valve core 32 is provided with a second abutment cavity 322 disposed opposite the first abutment cavity 25, and the first elastic return member 32 abuts against the second abutment cavity 322. When the liquid pressure in the transition cavity 12 applied to the first valve core 32 is less than the elastic force of the first elastic return member 32, the first valve core 32 will move toward the transition cavity 12 or remain in a state of blocking the transition cavity 12.

[0057] There is a first gap between the outer circumference of the first valve core and the inner wall of the liquid outlet cavity 11. The first valve core is provided with a first liquid guide groove or a first liquid guide hole connecting the first gap and the second abutting cavity. The first liquid guide groove is opened toward the injection diversion joint 2. Figures 15 to 17 A first protruding ring 323 and a second protruding ring 324 are respectively provided at both ends of the first valve core 32. Both the first protruding ring 323 and the second protruding ring 324 protrude from the outer circumference of the first valve core 32 and fit within the liquid outlet cavity 11. The first and second protruding rings 323, 324 serve as guides during axial movement of the first valve core 32, helping to improve the stability of the axial movement of the first valve core 32, thereby ensuring a more stable flow rate during injection.

[0058] The first liquid-conducting groove 321 axially penetrates the axial groove of the first protruding ring 323 and is a radial groove communicating with the second abutting cavity 322. The second protruding ring 324 is provided with a second liquid-conducting groove 325 axially penetrating the second protruding ring 324 and communicating with the first gap a, so that the liquid medicine in the transition cavity 12 can flow into the first gap a.

[0059] 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 to reduce unnecessary disturbances during the flow of the liquid medicine.

[0060] In this embodiment, the end surface of the first valve core 32 opposite the transition chamber 12 is provided with a first sealing groove 326. A first sealing member for sealing the transition chamber 12 is located within the first sealing groove 326. When the first sealing member contacts the outlet chamber, the first gap a is disconnected from the transition chamber 12. When the pressure of the liquid medicine in the transition chamber 12 increases, driving the first valve core 32 away from the transition chamber 12, the first sealing member releases its seal on the transition chamber 12, and the first gap a is connected to the transition chamber 12. Because the cross-sectional area of ​​the transition chamber 12 is smaller than that of the outlet chamber 11, the pressure acting on the surface of the first valve core 32 increases as the contact area with the liquid medicine increases. This helps propel the first valve core 32 to quickly move until it contacts the injection diversion connector 2, thereby accelerating the injection of liquid medicine.

[0061] In this embodiment, the power chamber 13 of the liquid-passing body 1 is preferably coaxially arranged with the transition chamber 12 and the liquid 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 more easily pushes the first valve core 32 at high speed, resulting in a higher initial velocity of the liquid, which helps to increase the injection speed. The power chamber 13 is equipped with a first piston 4, which reciprocates within the power chamber 13 to drive the liquid in the transition chamber 12 into the liquid outlet chamber 11, or the liquid in the liquid inlet chamber 14 into the transition chamber 12.

[0062] The power chamber 13 of this embodiment is coaxially arranged with the transition chamber 12, the liquid outlet chamber 11, and the injection port 81. The liquid inlet chamber 14 intersects and communicates with the transition chamber 12 and is used to inject liquid medicine 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 equipped 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 return member 52. The first valve core 32 and the second valve core 51 of this embodiment preferably have identical structures for easier assembly. Specifically, a second gap b is provided between the outer peripheral surface of the second valve core 51 and the inner side wall of the liquid inlet chamber 14, and the second gap b is communicated with the transition chamber 12. The second valve core 51 is provided with the third abutting chamber 511 on the side facing away from the liquid inlet joint 6, and a fourth abutting chamber 141 is provided in the liquid inlet chamber 14, which is opposite to the third abutting chamber 511. The second elastic return member 52 abuts against the third abutting chamber 511 and the fourth abutting chamber 141, and can drive the second valve core 51 to move toward the direction close to the liquid inlet channel 61, and disconnect the second gap b from the liquid inlet channel 61. A third and fourth raised rings are provided at each end of the second valve core 51, respectively. Both the third and fourth raised rings protrude from the outer circumference of the second valve core 51 and fit within the liquid inlet chamber 14. A third liquid guide groove 512 is provided on the end of the second valve core 51 away from the transition chamber 12. The third liquid guide groove 512 axially penetrates the third raised 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 raised ring, axially penetrating the fourth raised ring and communicating with the second gap b. A second sealing groove is provided on the end surface of the second valve core opposite the liquid inlet channel 61. A second sealing member is located within the second sealing groove for sealing the liquid inlet channel 61.

[0063] In this embodiment, the first elastic return member 32 and the second elastic return member 52 are preferably compression springs.

[0064] The liquid inlet connector 6 of this embodiment is also provided with a liquid inlet pipe 91, and a second piston 92 is provided in the liquid inlet pipe 91. The liquid inlet pipe 91, the second piston 92 and the liquid inlet connector 6 constitute a conventional syringe. When the second piston 92 draws the medicinal liquid into the liquid inlet pipe 91, the second piston 92 seals the medicinal liquid in the liquid inlet pipe 91 by inserting the liquid inlet pipe 91 into the liquid inlet cavity 14 of the liquid-passing body 1. By pushing the second piston 92, pressure is applied to the medicinal liquid in the liquid inlet pipe 91. The second valve core 51 overcomes the pressure of the second elastic return member 52 and moves away from the liquid inlet connector 6. The second gap b is connected to the liquid inlet channel 61, thereby achieving pre-filling of the transition cavity 12 with the medicinal liquid. In addition, the medicinal liquid in the liquid inlet channel 61 can be allowed to enter the transition cavity 12 by pulling the first piston 4.

[0065] The operation of the needle-free injector according to the embodiment of the present invention will be described below with reference to the accompanying drawings.

[0066] Pumping status: Figure 4 As shown, the first piston 4 moves to the right, and negative pressure is formed in the transition chamber 12. The first valve core 32 moves to the right due to the suction force of the transition chamber 12 and the force of the first elastic return member 32 until it is limited by the liquid-passing body 1; at the same time, the second valve core 51 overcomes the elastic force of the second elastic return member 52 under the action of negative pressure and moves downward, and the medicinal liquid in the liquid inlet channel 61 enters the transition chamber 12 through the second gap b.

[0067] Injection status: Figure 5 As shown, the first piston 4 moves to the left, pushing the medicinal liquid in the transition chamber 12 to gather to the left, and forming a thrust on the first valve core 32. The first valve core 32 moves to the left until it is limited by the injection diverter joint 2. The medicinal liquid flows into the central flow channel 21 of the injection diverter joint 2 through the second liquid guide groove 325, the first gap a, and the first liquid guide groove 321, and is distributed to each injection chamber 23 through the diverter hole 22 of the injection diverter joint 2, and is ejected through the injection hole 81; at the same time, the second valve core 51 moves upward under the action of the hydraulic pressure in the transition chamber 12 and the elastic force of the second elastic return member 52 until it is limited by the Luer joint. At this time, the medicinal liquid cannot flow into the transition chamber 12 through the second gap b.

[0068] The liquid-passing body 1 of the needle-free syringe of this embodiment is preferably made of medical-grade plastic, so that the internal state of the needle-free syringe can be visualized, which reduces the processing cost and material cost compared with metal materials; the materials of the needle-free injection head 8, 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 repeated cleaning and non-standard sterilization operations.

[0069] The above disclosure is only a preferred embodiment of the present invention and certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims

1. A needle-free syringe, characterized in that: It includes a liquid-passing body, an injection diverter joint, a regulating valve group, a liquid outlet valve, a liquid inlet valve, a liquid inlet joint and a first piston. The liquid-passing body is provided with a transition chamber, a liquid inlet chamber intersecting and communicating with the transition chamber, and a liquid outlet chamber and a power chamber respectively provided at both ends of the transition chamber. The transition chamber is used for pre-filling the liquid, the liquid outlet valve is provided in the liquid outlet chamber, the liquid inlet valve is provided in the liquid inlet chamber, and a first piston is provided in the power chamber, and the first piston is connected to a power source. The injection diverter joint is sealed and connected to the liquid-passing main body. The injection diverter joint is provided with a central flow channel, a diverter hole, an injection chamber, and a regulating chamber. The central flow channel is communicated with the liquid outlet chamber. The diverter holes are arranged in an array on the periphery of the central flow channel. The injection chamber and the regulating chamber are both arranged corresponding to the diverter holes. One end of the diverter hole is communicated with the central flow channel, and the other end is communicated with at least one of the injection chamber and the regulating chamber. The regulating chamber is cross-arranged with at least one of the injection chamber and the diverter hole. The injection chamber is coaxially communicated with the injection hole communicating with the outside world. The regulating valve group is arranged in the regulating chamber, and the length of the regulating valve group extending toward the injection chamber or the diversion hole is adjustable; The liquid inlet joint is sealedly connected to the liquid-passing body, and the liquid inlet joint is provided with a liquid inlet channel selectively communicating with the liquid inlet cavity; The first piston reciprocates in the power chamber to drive the liquid outlet valve to connect the transition chamber with the central flow channel, or drives the liquid inlet valve to connect the liquid inlet channel with the transition chamber.

2. The needle-free injector according to claim 1, wherein The regulating chamber includes a flow limiting chamber and a position limiting chamber, the regulating valve group includes a regulating valve core and a position limiting stud, the regulating valve core is sealed and connected to the flow limiting chamber, the position limiting stud is connected to the position limiting chamber, the end face of the position 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 position limiting chamber, when the position limiting stud is rotated to a preset position, the first tooth groove is engaged with the second tooth groove.

3. The needle-free injector according to claim 2, characterized in that The flow limiting chamber is provided with a first anti-rotation plane, and the side wall of the regulating valve core extending into the flow limiting chamber is provided with a second anti-rotation plane, and the second anti-rotation plane is opposite to the first anti-rotation plane.

4. The needle-free injector according to claim 1, wherein One end of the diverter hole away from the central flow channel is connected to the injection chamber and the regulating chamber. The flow limiting chamber is coaxially arranged with the diverter hole, and the portion of the regulating valve group extending toward the injection chamber is adapted to the diverter hole.

5. The needle-free injector according to claim 1, wherein The central flow channel is arranged in parallel with the injection chamber, and the diversion hole is arranged from the central flow channel in a direction away from the injection hole.

6. The needle-free injector according to claim 1, wherein It also includes a needle-free injection head, the injection hole is arranged in the needle-free injection head, the injection chamber includes a mounting chamber and a guide chamber, the guide chamber connects the mounting 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 is not smaller than the cross-sectional area of ​​the guide chamber, and the needle-free injection head is arranged in the mounting chamber.

7. The needle-free injector according to claim 1, wherein The injection hole is coaxially arranged with the guide cavity, and the injection hole includes a first chamber, a second chamber, and a third chamber. The first chamber is communicated with the outside, the second chamber connects the first chamber and the third chamber, and the third chamber has a constant cross-sectional area. The cross-sectional area of ​​the first chamber is smaller than the cross-sectional area of ​​the third chamber, and the cross-sectional area of ​​the second chamber gradually increases in the direction away from the first chamber.

8. The needle-free injector according to claim 2, wherein: The liquid outlet valve includes a first valve core and a first elastic return member. The first valve core is provided at one end of the liquid outlet chamber close to the transition chamber. The central flow channel is provided with a first abutting chamber opposite to the liquid outlet valve. The first valve core is provided with a second abutting chamber opposite to the first abutting chamber. Both ends of the first elastic return member abut against the first abutting chamber and the second abutting chamber, respectively. A first gap is defined between the outer peripheral surface of the first valve core and the inner sidewall of the liquid outlet chamber. The first valve core is provided with a first liquid guide groove or a first liquid guide hole communicating with the first gap and the second abutting chamber. The first liquid guide groove is provided with an opening toward the injection diversion joint. The liquid inlet valve includes a second valve core and a second elastic return member. A second gap is formed between the outer peripheral surface of the second valve core and the inner side wall of the liquid inlet cavity. The second gap is communicated with the transition cavity. The second valve core is provided with a third abutment cavity on the side facing away from the liquid inlet joint. A fourth abutment cavity is provided in the liquid inlet cavity, which is arranged opposite to the third abutment cavity. The second elastic return member abuts against the third and fourth abutment cavities, and can drive the second valve core to move toward the direction close to the liquid inlet channel and disconnect the second gap from the liquid inlet channel.

9. The needle-free injector according to claim 2, wherein: A first convex ring and a second convex ring are respectively provided at both ends of the first valve core. The first convex ring and the second convex ring are both protruding toward the outer peripheral surface of the first valve core and are both adapted to the liquid outlet cavity. The first liquid guide groove axially penetrates the first convex ring and is in communication with the second abutting cavity. The second convex ring is provided with a second liquid guide groove, which axially penetrates the second convex ring and is in communication with the first gap. A first sealing groove is provided on the end surface of the first valve core opposite to the transition cavity, and a first sealing member for sealing the transition cavity is provided in the sealing groove; A third convex ring and a fourth convex ring are respectively provided at both ends of the second valve core. The third convex ring and the fourth convex ring are both protruding toward the outer peripheral surface of the second valve core and are both adapted to the liquid inlet cavity. A third liquid guide groove is provided at one end of the second valve core away from the transition cavity. The third liquid guide groove axially penetrates the third convex ring and is in communication with the third abutting cavity and the second gap. A fourth liquid guide groove is provided on the fourth convex ring. The fourth liquid guide groove axially penetrates the fourth convex ring and is in communication with the second gap. A second sealing groove is provided on the end surface of the second valve core opposite to the liquid inlet channel, and a second sealing member for sealing the liquid inlet channel is provided in the second sealing groove.

10. The needle-free injector according to claim 8, characterized in that The central flow channel is coaxially arranged with the transition chamber, the power chamber, and the liquid outlet chamber. The cross-sectional area of ​​the transition chamber is smaller than the cross-sectional area of ​​the liquid outlet chamber, and the cross-sectional area of ​​the transition chamber is smaller than the cross-sectional area of ​​the power chamber.

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