A continuous needleless injector

Abstract

The utility model relates to medical equipment technical field especially relates to a continuous needleless injector, including medicine pipe, it has medicine liquid chamber, medicine liquid chamber includes intercommunication injection chamber and pressurizing chamber, and is equipped with push rod in pressurizing chamber, and the lateral wall of pressurizing chamber is connected with medicine liquid storage chamber, the junction of pressurizing chamber and injection chamber and its junction with medicine liquid storage chamber all are equipped with valve chamber, one end of valve chamber is equipped with liquid input, and the other end is equipped with liquid output, is equipped with check valve in valve chamber, check valve includes float valve and elastic part, float valve includes sealing part and valve core seat, and valve core seat sets up in the bottom of sealing part, and valve core seat is equipped with liquid flow guide groove, and liquid flow guide groove and the inner wall of valve chamber form liquid flow guide chamber, and liquid flow guide chamber is connected with the liquid output of valve chamber, and elastic part sets up between the bottom of valve core seat and liquid output, the utility model discloses simple structure, good sealing, injection response speed is fast and injection accuracy is high.

Description

Technical Field

[0001] This utility model relates to the field of medical equipment technology, and in particular to a continuous needle-free injector. Background Technology

[0002] Needle-free injectors eliminate the need for needles. They are medical devices that inject liquid medications intradermally, subcutaneously, or intramuscularly through a micro-orifice at the tip, thus sparing patients the pain of needle pricks. Existing needle-free injectors feature one-way valves facing opposite directions at both the injection head and the supply end. When liquid supply is needed, the injection head closes and the supply end opens; when injection is needed, the supply end closes and the injection head opens, allowing for switching between liquid supply and injection.

[0003] The above-mentioned one-way valves mostly use spring steel ball valves or metal diaphragm valves to control the flow direction of the liquid. The above structure has the following disadvantages: (1) During the high-pressure injection stage, the steel ball is prone to inertial displacement, which can lead to sealing failure. The backflow of the liquid can reach more than 5% of the total dose, causing dosage error; (2) During the flow process of the one-way valve, eddies and bubbles are easily generated, which hinder the instantaneous injection of the liquid and affect the consistency of injection depth; (3) The structure is complex. In order to meet the bidirectional sealing requirements, the suction valve and the injection valve need to be set independently. The assembly accuracy requirements are strict, which increases the production cost. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art. This invention provides a continuous needle-free injector with simple structure, good sealing performance, fast injection response speed and high injection accuracy.

[0005] To address the aforementioned issues, this invention proposes a continuous needle-free injector, comprising a drug tube having a drug liquid chamber. The drug liquid chamber includes an injection chamber and a pressurization chamber that are interconnected. A push rod is provided within the pressurization chamber, and the side wall of the pressurization chamber is connected to a drug liquid storage chamber.

[0006] A valve chamber is provided at the junction of the pressurizing chamber and the injection chamber, and at the junction of the pressurizing chamber and the drug storage chamber. One end of the valve chamber is provided with a liquid inlet and the other end is provided with a liquid outlet. A one-way valve is provided inside the valve chamber.

[0007] The one-way valve includes a traveling valve and an elastic element; the traveling valve includes a sealing part and a valve core seat, the valve core seat is disposed at the bottom of the sealing part, the valve core seat is provided with a liquid guiding groove, the liquid guiding groove and the inner wall of the valve cavity form a liquid guiding cavity, the liquid guiding cavity is connected to the liquid outlet of the valve cavity, and the elastic element is disposed between the bottom of the valve core seat and the liquid outlet;

[0008] The elastic element can drive the sealing part to abut against the liquid inlet of the valve chamber to seal it, thereby blocking the connection between the liquid guide chamber and the liquid inlet.

[0009] As an improvement to the above technical solution, the valve cavity, sealing part and valve core seat are all coaxially arranged, and the liquid guide groove is evenly distributed circumferentially with the central axis of the valve core seat as the axis.

[0010] As an improvement to the above technical solution, the axial direction of the liquid guide channel is parallel to the axial direction of the valve core seat.

[0011] As an improvement to the above technical solution, the inner wall of the liquid guide channel is an arc surface.

[0012] As an improvement to the above technical solution, the traveling valve has a predetermined distance from the inner wall of the valve cavity;

[0013] The valve chamber includes a first valve chamber and a second valve chamber arranged coaxially from the liquid inlet to the liquid outlet. The sealing part is located in the first valve chamber, and the valve core seat is located in the second valve chamber.

[0014] The junction of the first valve chamber and the second valve chamber is a first stepped portion, and the valve core seat abuts against the first stepped portion.

[0015] As an improvement to the above technical solution, the sealing part is provided with a sealing end at one end near the liquid inlet. The cross-sectional area of ​​the sealing end gradually decreases from the end near the liquid inlet to the end near the sealing part. The liquid inlet has a conical structure. The sealing end can extend into the liquid inlet and abut against the liquid inlet to seal it.

[0016] The diameter of the liquid outlet is smaller than the diameter of the valve core seat, and the diameter of the liquid outlet gradually decreases from the end closer to the valve core seat to the end farther away from the valve core seat.

[0017] As an improvement to the above technical solution, an elastic element mounting groove is provided along the inner wall of the liquid outlet, and the junction of the elastic element mounting groove and the liquid outlet is a second step.

[0018] One end of the elastic element is connected to or abuts against the bottom of the valve core seat, and the other end is connected to or abuts against the second stepped portion.

[0019] As an improvement to the above technical solution, a transition cavity is provided at the connection between the pressure chamber and the valve cavity of the injection chamber, and the diameter of the transition cavity is smaller than the diameter of the pressure chamber.

[0020] As an improvement to the above technical solution, the junction of the pressurizing chamber and the transition chamber is an arc-shaped protrusion.

[0021] As an improvement to the above technical solution, the outer wall of the injection cavity is provided with a front cover, the front cover has an injection head, and the injection head is in communication with the injection cavity;

[0022] The outer wall of the drug storage chamber is provided with a top cover, and the drug storage chamber is also provided with a connector for connecting to a syringe.

[0023] The following are the beneficial effects of implementing this utility model:

[0024] This utility model discloses a one-way valve for a continuous needle-free injector, comprising a traveling valve and an elastic element. The traveling valve includes a sealing part and a valve core seat, with the valve core seat located at the bottom of the sealing part. The valve core seat has a liquid guiding groove, which, together with the inner wall of the valve cavity, forms a liquid guiding cavity. The liquid guiding cavity communicates with the liquid outlet of the valve cavity. The elastic element is located between the bottom of the valve core seat and the bottom of the valve cavity. The elastic element can drive the sealing part to abut against the liquid inlet of the valve cavity to seal it, thereby blocking the communication between the liquid guiding cavity and the liquid inlet. First, the traveling valve, composed of a sealing part and a valve core seat, combined with the bottom elastic element, forms a more precise and elastically responsive one-way on / off control mechanism. Second, the valve core seat has a liquid guiding groove, which, together with the inner wall of the valve cavity, forms a dedicated guiding channel. Fluid flows sequentially from the liquid inlet, the liquid guiding cavity, and the liquid outlet, resulting in a clear flow path and reduced turbulence. Finally, when the elastic element is not injected, it drives the sealing part to fit tightly against the inlet, forming a reliable seal to prevent backflow or premature leakage of the medicine. Attached Figure Description

[0025] Figure 1 This is a front view of a continuous needle-free injector according to an embodiment of the present invention;

[0026] Figure 2 This is a cross-sectional view of a continuous needle-free injector according to an embodiment of the present invention;

[0027] Figure 3 yes Figure 2 Enlarged view of section A in the middle;

[0028] Figure 4 This is a perspective view of a floating valve according to an embodiment of the present invention. Detailed Implementation

[0029] 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.

[0030] See Figure 1 and Figure 2As shown, this utility model embodiment provides a continuous needle-free injector, including a drug tube 1', which has a drug liquid chamber 1. The drug liquid chamber 1 includes an injection chamber 3 and a pressurization chamber 2 that are interconnected. A push rod 21 is provided in the pressurization chamber 2. The side wall of the pressurization chamber 2 is connected to a drug liquid storage chamber 4.

[0031] A valve chamber 5 is provided at the junction of the pressurizing chamber 2 and the injection chamber 3, as well as at the junction of the pressurizing chamber 2 and the drug storage chamber 4. One end of the valve chamber 5 is provided with a liquid inlet 53, and the other end is provided with a liquid outlet 54. A one-way valve 6 is provided inside the valve chamber 5.

[0032] This invention improves the one-way valve 6 structure of a continuous unlicensed injector to simplify the one-way valve 6 structure while ensuring injection accuracy and response speed.

[0033] For details, see Figure 3 and Figure 4 As shown, the one-way valve 6 includes a traveling valve 61 and an elastic element 62; the traveling valve 61 includes a sealing part 611 and a valve core seat 612, the valve core seat 612 is disposed at the bottom of the sealing part 611, the valve core seat 612 is provided with a liquid guiding groove 613, the liquid guiding groove 613 and the inner wall of the valve cavity 5 form a liquid guiding cavity 63, the liquid guiding cavity 63 communicates with the liquid outlet 54 of the valve cavity 5, and the elastic element 62 is disposed between the bottom of the valve core seat 612 and the liquid outlet 54;

[0034] The elastic element 62 can drive the sealing part 611 to abut against the liquid inlet 53 of the valve cavity 5 to seal it, thereby blocking the connection between the liquid guide cavity 63 and the liquid inlet 53.

[0035] It should be noted that the aforementioned movable valve 61 is a one-piece molded structure, made of rubber or silicone. Driven by the elastic element 62, the movable valve 61's sealing part 611 abuts against the edge of the liquid inlet 53 and deforms to achieve a seal. Furthermore, the aforementioned elastic element 62 is a commonly available compression spring.

[0036] Working principle of this utility model embodiment:

[0037] During injection, the push rod 21 slides towards the injection chamber 3, increasing the pressure in the pressurizing chamber 2. The high-pressure liquid flows towards the injection chamber 3, pressurizing the one-way valve 6 in the valve chamber 5. The elastic element 62 compresses and deforms, causing the traveling valve 61 to slide towards the injection chamber 3. The high-pressure liquid flows from the liquid inlet 53 into the liquid guide chamber 63, formed by the liquid guide groove 613 and the inner wall of the valve chamber 5, and then flows from the liquid guide chamber 63 to the liquid outlet 54. After injection, the push rod 21 slides away from the injection chamber 3, decreasing the pressure in the pressurizing chamber 2. The one-way valve 6 in the injection chamber 3 closes, and the elastic element 62 of the one-way valve 6 in the drug storage chamber 4 compresses and deforms, causing the traveling valve 61 to slide towards the pressurizing chamber 2. The high-pressure liquid flows from the liquid inlet 53 into the liquid guide chamber 63, formed by the liquid guide groove 613 and the inner wall of the valve chamber 5, and then flows from the liquid guide chamber 613 to the liquid outlet 54, replenishing the pressurizing chamber 2 with drug solution.

[0038] First, the traveling valve 61 consists of a sealing part 611 and a valve core seat 612, which, together with the bottom elastic element 62, form a more precise control and elastic response one-way on / off control mechanism. Second, the valve core seat 612 is provided with a liquid guide groove 613, which forms a dedicated flow channel with the inner wall of the valve cavity 5. The fluid flows sequentially from the liquid inlet 53, the liquid guide cavity 63, and the liquid outlet 54, with a clear flow path and reduced turbulence. Finally, in the non-injection state, the elastic element 62 drives the sealing part 611 to fit tightly against the liquid inlet 53, forming a reliable seal and preventing backflow or premature leakage of the drug.

[0039] It should be noted that the liquid flows into the valve chamber 5 from the liquid inlet 53 along the sealing part 611. The evenly distributed liquid guide grooves 613 on the valve core seat 612 allow the liquid to flow in evenly from multiple directions when passing through the valve core seat 612, effectively avoiding flow deviation and eddy current phenomena, and improving fluid stability and flow velocity consistency. In addition, the multiple evenly distributed liquid guide grooves 613 provide a larger flow cross section, reducing the resistance when the fluid passes through and improving the liquid delivery efficiency. Finally, the circumferential uniform structure conforms to the principle of symmetrical design, making the entire valve core seat 612 structure less prone to deformation under pressure, with less vibration and a more durable and reliable sealing effect.

[0040] Preferably, the axial direction of the liquid guide channel 613 is parallel to the axial direction of the valve core seat 6123. When the liquid flows through the one-way valve 6, it flows from the liquid inlet 53 to the liquid outlet 54. Since the axial direction of the liquid guide channel 613 is parallel to the valve core seat 612, the liquid can move in a straight line along the liquid guide channel 613, reducing flow resistance and kinetic energy loss caused by changes in direction. Secondly, the axially parallel liquid guide channel 613 can accelerate the liquid flow rate, thereby improving the response efficiency of the one-way valve 6, making it suitable for equipment sensitive to flow rate or reaction time. Finally, the consistent flow path direction helps the liquid form a laminar flow state inside the valve cavity 5, avoiding eddies or reverse pressure waves caused by directional twisting or tortuosity.

[0041] More preferably, the inner wall of the liquid guide channel 613 is an arc surface. The arc surface structure avoids flow inflection points such as sharp angles and right angles, allowing the liquid to form a continuous and smooth flow path within the channel, significantly reducing the frictional resistance and turbulent resistance of the fluid, which is beneficial for the high-speed and stable passage of the liquid. In addition, as the liquid transitions into the valve cavity along the inner wall of the arc surface, the impact force is dispersed and guided by the arc surface, effectively reducing the local impact on the traveling valve 61, extending the service life of the component, and reducing fatigue wear.

[0042] In some embodiments, the traveling valve 61 has a predetermined distance from the inner wall of the valve cavity 5;

[0043] The valve chamber 5 includes a first valve chamber 51 and a second valve chamber 52 arranged coaxially from the liquid inlet 53 to the liquid outlet 54. The sealing part 611 is located in the first valve chamber 51, and the valve core seat 612 is located in the second valve chamber 52.

[0044] The junction of the first valve chamber 51 and the second valve chamber 52 is a first stepped portion 56, and the valve core seat 612 abuts against the first stepped portion 56.

[0045] It should be noted that the traveling valve 61 and the inner wall of the valve chamber 6 have a predetermined distance, which forms an annular flow guiding space, allowing the liquid to be fully distributed and buffered before entering the sealing area, effectively reducing the impact or turbulence caused by sudden changes in flow velocity. In addition, the appropriate gap can avoid excessive frictional resistance, allowing the traveling valve 61 to move quickly and freely under liquid pressure, ensuring rapid valve opening and closing response and complete opening and closing.

[0046] It should be noted that the junction of the first valve chamber 51 and the second valve chamber 52 is the first step 56, which facilitates the installation of the traveling valve 61 and the elastic element 62. The above components only need to be installed in sequence.

[0047] Preferably, the sealing part 611 has a sealing end 614 at one end near the liquid inlet 53. The cross-sectional area of ​​the sealing end 614 gradually decreases from the end near the liquid inlet 53 to the end near the sealing part 611. The liquid inlet 53 has a conical structure. The sealing end 614 can extend into the liquid inlet 53 and abut against the liquid inlet 53 to seal it.

[0048] The diameter of the liquid outlet 54 is smaller than the diameter of the valve core seat 612, and the diameter of the liquid outlet 54 gradually decreases from the end closer to the valve core seat 612 to the end farther away from the valve core seat 612.

[0049] The sealing end 614 adopts a tapered structure with a gradually decreasing cross-section from top to bottom, which can be inserted into the tapered liquid inlet 53 to achieve a reliable seal. It has the advantages of self-centering, self-reinforcing sealing and sensitive opening and closing. The liquid outlet 53 has a gradually tapering structure with a diameter smaller than the valve core seat 612, which helps to increase the jet velocity, prevent backflow and enhance the stability of unidirectional output. The overall structure achieves efficient sealing, high-response opening and closing and precise liquid control, effectively solving the problems of poor sealing, high risk of backflow and inaccurate liquid output in the prior art.

[0050] In some embodiments, an elastic element mounting groove 55 is provided along the inner wall of the liquid outlet 54, and the junction of the elastic element mounting groove 55 and the liquid outlet 54 is a second step portion.

[0051] One end of the elastic element 62 is connected to or abuts against the bottom of the valve core seat 612, and the other end is connected to or abuts against the second stepped portion.

[0052] In some embodiments, a transition cavity 22 is provided at the connection between the pressurizing cavity 2 and the valve cavity 5 of the injection cavity 3, and the diameter of the transition cavity 22 is smaller than the diameter of the pressurizing cavity 2.

[0053] The transition chamber 22 is located between the pressurization chamber 2 and the injection chamber 3. Its diameter is smaller than that of the pressurization chamber 2. It can realize a smooth transition of fluid pressure from high pressure to low pressure, reduce the instantaneous impact of liquid, and at the same time have the functions of throttling and flow limiting, rectification and stabilization, and check valve assistance.

[0054] Preferably, the junction between the pressurization chamber 2 and the transition chamber 22 is a convex arc surface. This structure can buffer the instantaneous impact of high-pressure liquid flow, reduce impact stress concentration, optimize liquid flow lines, reduce turbulence and stagnation, and improve the injection stability, cleaning performance and structural reliability of the system.

[0055] In some embodiments, the outer wall of the injection cavity 3 is provided with a front cover 2', the front cover 2' has an injection head 3', and the injection head 3' communicates with the injection cavity 3;

[0056] The outer wall of the drug storage cavity 4 is provided with a top cover 4', and the drug storage cavity 4 is also provided with a connector 5', which is used to connect to a syringe.

[0057] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications are also considered to be within the protection scope of this utility model.

Claims

1. A continuous needle-free injector, characterized in that, The device includes a medicine tube with a medicine chamber, the medicine chamber comprising an injection chamber and a pressurization chamber that are interconnected, a push rod being provided in the pressurization chamber, and a medicine storage chamber being connected to the side wall of the pressurization chamber. A valve chamber is provided at the junction of the pressurizing chamber and the injection chamber, and at the junction of the pressurizing chamber and the drug storage chamber. One end of the valve chamber is provided with a liquid inlet and the other end is provided with a liquid outlet. A one-way valve is provided inside the valve chamber. The one-way valve includes a traveling valve and an elastic element; the traveling valve includes a sealing part and a valve core seat, the valve core seat is disposed at the bottom of the sealing part, the valve core seat is provided with a liquid guiding groove, the liquid guiding groove and the inner wall of the valve cavity form a liquid guiding cavity, the liquid guiding cavity is connected to the liquid outlet of the valve cavity, and the elastic element is disposed between the bottom of the valve core seat and the liquid outlet; The elastic element can drive the sealing part to abut against the liquid inlet of the valve chamber to seal it, thereby blocking the connection between the liquid guide chamber and the liquid inlet.

2. The continuous needle-free injector as described in claim 1, characterized in that, The valve cavity, sealing part and valve core seat are all coaxially arranged, and the liquid guide groove is evenly distributed circumferentially with the central axis of the valve core seat as the axis.

3. The continuous needle-free injector as described in claim 2, characterized in that, The axial direction of the liquid guide channel is parallel to the axial direction of the valve core seat.

4. The continuous needle-free injector as described in claim 2, characterized in that, The inner wall of the liquid guide channel is curved.

5. The continuous needle-free injector as described in claim 1, characterized in that, The movable valve has a predetermined distance from the inner wall of the valve cavity; The valve chamber includes a first valve chamber and a second valve chamber arranged coaxially from the liquid inlet to the liquid outlet. The sealing part is located in the first valve chamber, and the valve core seat is located in the second valve chamber. The junction of the first valve chamber and the second valve chamber is a first stepped portion, and the valve core seat abuts against the first stepped portion.

6. The continuous needle-free injector as described in claim 5, characterized in that, The sealing part has a sealing end at one end near the liquid inlet. The cross-sectional area of ​​the sealing end gradually decreases from the end near the liquid inlet to the end near the sealing part. The liquid inlet has a conical structure. The sealing end can extend into the liquid inlet and abut against the liquid inlet to seal it. The diameter of the liquid outlet is smaller than the diameter of the valve core seat, and the diameter of the liquid outlet gradually decreases from the end closer to the valve core seat to the end farther away from the valve core seat.

7. The continuous needle-free injector as described in claim 1, characterized in that, An elastic element mounting groove is provided along the inner wall of the liquid outlet, and the junction of the elastic element mounting groove and the liquid outlet is a second step. One end of the elastic element is connected to or abuts against the bottom of the valve core seat, and the other end is connected to or abuts against the second stepped portion.

8. The continuous needle-free injector as described in claim 1, characterized in that, A transition cavity is provided at the connection between the pressurizing chamber and the valve cavity of the injection chamber, and the diameter of the transition cavity is smaller than the diameter of the pressurizing chamber.

9. The continuous needle-free injector as described in claim 8, characterized in that, The junction between the pressurization chamber and the transition chamber is a curved protrusion.

10. The continuous needle-free injector as described in claim 1, characterized in that, The outer wall of the injection cavity is provided with a front cover, the front cover has an injection head, and the injection head is in communication with the injection cavity; The outer wall of the drug storage chamber is provided with a top cover, and the drug storage chamber is also provided with a connector for connecting to a syringe.

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