A continuous needleless injector

Abstract

The utility model relates to medical instrument technical field especially relates to a continuous needleless injector, including medicine pipe, it has medicine liquid chamber, one end of medicine liquid chamber is equipped with pressurizing chamber, the other end is equipped with injection chamber, be equipped with push rod in pressurizing chamber, the lateral wall of medicine liquid chamber is linked with medicine liquid storage chamber, the junction of medicine liquid chamber and injection chamber and the junction of medicine liquid chamber and medicine liquid storage chamber all are equipped with valve chamber, be equipped with check valve in valve chamber, the check valve includes ejector pin and valve core, the ejector pin includes guide rod and sealing part, the guide rod sleeve has the valve core, be equipped with elastic member between sealing part with valve core, valve core has the liquid delivery path of communicating oneself upper surface and bottom surface, sealing part can block the liquid input port of valve chamber with the communication of liquid delivery path. The utility model has high sealing reliability, long service life, injection is smooth and high injection accuracy.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a continuous needle-free 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 micro-holes at the tip, thus sparing the patient the pain of needle pricks.

[0003] Existing needle-free injectors use a one-way valve comprising a return spring and a ball seal. The return spring ensures the ball seal abuts against the liquid inlet for sealing. When high-pressure liquid is applied to the ball seal, the return spring compresses and deforms, allowing the high-pressure liquid to flow into the gap between the ball seal and the liquid inlet. This process enables the injection or replenishment of injected liquid.

[0004] The above one-way valve structure has the following disadvantages: (1) It lacks a guide structure, and the spherical seal is easily damaged or jammed, which makes it impossible to inject liquid smoothly; (2) When the injection liquid flows through the spherical seal, the opening and closing of the spherical seal needs to overcome the spring pressure and fluid resistance. Under low flow rate or pressure fluctuation conditions, the movement may be delayed, affecting the immediacy and accuracy of the injection. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the prior art. This invention provides a continuous needle-free injector with high sealing reliability, long service life, smooth injection, and high injection accuracy.

[0006] To address the aforementioned issues, this invention proposes a continuous needle-free injector, comprising a drug tube having a drug liquid chamber, one end of which is provided with a pressurization chamber and the other end with an injection chamber, a push rod being provided within the pressurization chamber, and the side wall of the drug liquid chamber communicating with a drug liquid storage chamber.

[0007] A valve chamber is provided at the junction of the drug solution chamber and the injection chamber, as well as at the junction of the drug solution chamber and the drug solution storage chamber, and a one-way valve is provided in the valve chamber.

[0008] The one-way valve includes a pin and a valve core. The pin includes a guide rod and a sealing part. The guide rod is sleeved with the valve core. An elastic element is provided between the sealing part and the valve core. The valve core has a liquid delivery channel connecting its upper surface and bottom surface. The sealing part can block the connection between the liquid inlet of the valve cavity and the liquid delivery channel.

[0009] As an improvement to the above technical solution, the valve core has a guide channel in the center that connects its upper surface and bottom surface, and the liquid delivery channel is evenly distributed circumferentially on the valve core with the center of the guide channel as the center.

[0010] The end of the guide rod extends into the guide channel, and the guide rod can slide relative to the guide channel.

[0011] As an improvement to the above technical solution, the elastic element is sleeved on the guide rod, one end of the elastic element abuts or connects with the sealing part, and the other end abuts or connects with the surface of the valve core;

[0012] There is a predetermined distance between the sealing part and the inner wall of the valve cavity.

[0013] As an improvement to the above technical solution, the valve chamber extends from the liquid inlet to the liquid outlet and includes a first valve chamber, a second valve chamber, and a third valve chamber that are interconnected. A first step is provided at the junction of the first valve chamber and the second valve chamber, and a second step is provided at the junction of the second valve chamber and the third valve chamber.

[0014] The valve core is located in the third valve chamber and abuts against the second stepped portion, the ejector pin is located in the second valve chamber, and the sealing portion can abut against the first stepped portion.

[0015] As an improvement to the above technical solution, a sealing ring is provided on the outer side of the sealing part, and the sealing ring can abut against the first stepped part.

[0016] As an improvement to the above technical solution, the abutting sealing surface of the first stepped portion is inclined toward the first valve cavity;

[0017] When the sealing ring abuts and seals with the first stepped portion, the sealing end of the sealing portion can extend into the first valve cavity, and the cross-sectional area of ​​the sealing end gradually decreases from the top to the bottom.

[0018] As an improvement to the above technical solution, a transition cavity is provided at the junction of the pressurization chamber and the liquid medicine chamber, and at the junction of the valve chamber and the liquid medicine chamber of the liquid medicine storage chamber. The cross-sectional area of ​​the transition cavity gradually decreases from the top to the bottom.

[0019] As an improvement to the above technical solution, the end of the push rod away from the liquid cavity is provided with a travel channel cavity, the inner wall of one side of the travel channel cavity is provided with a placement hole, and the end of the placement hole away from the injection cavity is provided with an avoidance hole.

[0020] As an improvement to the above technical solution, the injection cavity is provided with a needleless injection head.

[0021] As an improvement to the above technical solution, the one-way valve of the drug storage chamber is connected to a Luer connector, which is connected to the injection needle tube.

[0022] The following are the beneficial effects of implementing this utility model:

[0023] Compared to existing technologies, the one-way valve of this continuous needle-free injector includes a ejector pin and a valve core. The ejector pin includes a guide rod and a sealing part. The guide rod is sleeved with the valve core, and the sealing part can seal the liquid inlet of the valve cavity. An elastic element is provided between the sealing part and the valve core. The ejector pin, in cooperation with the guide rod and the valve core, can slide along a predetermined track. The valve core has a liquid delivery channel connecting its upper and lower surfaces. After the ejector pin slides to the position where the seal is released, the liquid can flow out of the one-way valve from the liquid delivery channel. Because the ejector pin has a predetermined sliding track, it is less prone to jamming or damage during sliding, effectively improving sealing reliability and service life, thereby ensuring a smooth injection process. Attached Figure Description

[0024] Figure 1 This is a cross-sectional view of a continuous needle-free injector according to an embodiment of the present invention;

[0025] Figure 2 yes Figure 1 Enlarged view of point A in the image;

[0026] Figure 3 This is a cross-sectional view of a medicine tube according to an embodiment of the present invention;

[0027] Figure 4 This is a perspective view of a push rod according to an embodiment of the present invention;

[0028] Figure 5 This is a cross-sectional view of the push rod 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 As shown, this utility model embodiment provides a continuous needle-free injector, including a medicine tube with a medicine chamber 1, a push rod 21 in the pressure chamber 2, and an injection chamber 3 at the other end. The pressure chamber 2 is provided at one end of the medicine chamber 1, and the side wall of the medicine chamber 1 is connected to the medicine storage chamber 4.

[0031] A valve chamber 5 is provided at the junction of the drug liquid chamber 1 and the injection chamber 3, and at the junction of the drug liquid chamber 1 and the drug liquid storage chamber 4. A one-way valve 6 is provided in the valve chamber 5.

[0032] This embodiment of the invention improves the structure of the one-way valve 6 to increase its service life and ensure smoothness during the injection process, thereby improving operational accuracy.

[0033] For details, see Figure 2As shown, the one-way valve 6 includes a pin 61 and a valve core 62. The pin 61 includes a guide rod 64 and a sealing part 63. The guide rod 64 is sleeved on the valve core 62. An elastic element 65 is provided between the sealing part 63 and the valve core 62. The valve core 62 has a liquid delivery channel 621 that connects its upper surface and bottom surface. The sealing part 63 can block the connection between the liquid inlet of the valve cavity 5 and the liquid delivery channel 621.

[0034] Working principle of this utility model embodiment:

[0035] During injection, the push rod 21 is pushed towards the drug chamber 1 to pressurize the drug in the pressurizing chamber 2 and the drug chamber 1. The drug in the drug chamber 2 and the pressurizing chamber 1 flows under pressure into the valve chamber of the injection chamber 3. The one-way valve 6 in the valve chamber of the injection chamber 3 is pressurized, and its sealing part 63 slides towards the end of the injection chamber 3 to release the seal, and the drug is quickly injected into the injection chamber 3 for injection. When the push rod 21 slides away from the drug chamber 1, the pressurizing chamber 2 and the drug chamber 1 generate negative pressure. The sealing part of the injection chamber 3 slides to the sealing position under the action of the elastic element 65. At this time, the pressure in the drug chamber 1 and the pressurizing chamber 2 is less than the pressure in the drug storage chamber 4. The sealing part 61 of the one-way valve in the drug storage chamber 4 slides to the unsealed position, and the drug in the drug storage chamber 4 flows into the drug chamber 1 and the pressurizing chamber 2 to replenish the drug.

[0036] Compared to existing technologies, the one-way valve 6 of this invention's continuous needle-free injector includes a ejector pin 61 and a valve core 62. The ejector pin includes a guide rod 64 and a sealing part 63. The guide rod 64 is sleeved onto the valve core 62, and the sealing part 63 can seal the liquid inlet of the valve chamber 5. An elastic element 65 is provided between the sealing part 63 and the valve core 62. The ejector pin 61, in cooperation with the guide rod 64 and the valve core 62, can slide along a predetermined track. The valve core 62 has a liquid delivery channel 621 connecting its upper and lower surfaces. After the ejector pin 61 slides to the unsealed position, the liquid can flow out of the one-way valve 6 from the liquid delivery channel 621. Because the ejector pin 61 has a predetermined sliding track, it is less prone to jamming or damage during sliding, effectively improving sealing reliability and service life, thereby ensuring a smooth injection process.

[0037] Preferably, the valve core 62 has a guide channel 622 at its center that connects its upper surface and bottom surface, and the liquid delivery channel 621 is evenly distributed circumferentially on the valve core 5 with the center of the guide channel 622 as the center.

[0038] The end of the guide rod 64 extends into the guide channel 622, and the guide rod 64 can slide relative to the guide channel 622. The guide channel 622 provides a predetermined track for the sliding of the ejector pin 61, and the guide channel 622 is located at the center of the valve core 62, so that the guide rod 64 is subjected to more even force.

[0039] When the ejector pin 61 is pressed, its guide rod 64 slides along the guide channel 622, and the liquid flows along the outer periphery of the sealing part 63 to the liquid delivery channel 621. Since the liquid delivery channel 621 is centered on the center of the guide channel 622 and is evenly distributed circumferentially on the valve core 62, the liquid can flow out of the one-way valve 6 stably and smoothly.

[0040] More preferably, the elastic element 65 is sleeved on the guide rod 64, one end of the elastic element 65 abuts or connects with the sealing part 61, and the other end abuts or connects with the surface of the valve core 62.

[0041] The sealing part 61 has a predetermined distance from the inner wall of the valve cavity 5.

[0042] The aforementioned elastic element 65 is a spring component, which is sleeved on the guide rod 64. The auxiliary sealing part 61 slides back to the sealing position and continuously applies pressure to the sealing part 61, so that the sealing part 61 can abut and seal with the liquid inlet of the valve chamber 5.

[0043] In some embodiments, the valve chamber 5 extends from the liquid inlet to the liquid outlet and includes a first valve chamber 51, a second valve chamber 52, and a third valve chamber 53 that are interconnected. A first step portion 54 is provided at the junction of the first valve chamber 51 and the second valve chamber 52, and a second step portion 55 is provided at the junction of the second valve chamber 52 and the third valve chamber 53.

[0044] The valve core 62 is located in the third valve chamber 53 and abuts against the second stepped portion 55. The ejector pin 61 is located in the second valve chamber 52, and the sealing portion 61 can abut against the first stepped portion 54. In actual installation, the ejector pin 61, the elastic element 65, and the valve core 62 only need to be installed into the valve chamber 5 in sequence. The sealing portion 61 of the ejector pin moves in the second valve chamber 52, while the valve core 62 is fixed in the third valve chamber 53.

[0045] More preferably, a sealing ring 66 is provided on the outer side of the sealing part 63, and the sealing ring 66 can abut against the first stepped part 54.

[0046] Specifically, the abutting sealing surface of the first stepped portion 54 is inclined toward the first valve cavity 51;

[0047] When the sealing ring 66 abuts and seals against the first stepped portion 54, the sealing end of the sealing portion 63 can extend into the first valve cavity 51, and the cross-sectional area of ​​the sealing end gradually decreases from top to bottom. The inclined surface structure of the first stepped portion 54 and the sealing end structure of the sealing portion 63 enable less turbulence when the liquid flows through this area, thus ensuring the smoothness of the liquid injection process.

[0048] In some embodiments, transition chambers 11 are provided at the junction of the pressurization chamber 2 and the drug solution chamber 1, and at the junction of the valve chamber of the drug solution storage chamber 4 and the drug solution chamber 1. The cross-sectional area of ​​the transition chamber 11 gradually decreases from top to bottom. First, the gradually decreasing transition chamber 11 can mitigate the velocity change gradient in the drug solution delivery path and buffer the pressure shock generated when the pressurization chamber 2 or valve chamber 5 is opened. Second, the gradually changing cross-section design guides the fluid flow towards the central area, reducing eddies or stagnation zones generated at the junction corners, and reducing the risk of drug waste or inaccurate dosage due to precipitation or uneven mixing. Finally, this type of transition chamber can reduce drug backflow or leakage caused by sudden pressure changes during valve opening and closing, improving sealing reliability.

[0049] In some embodiments, see Figure 4 and Figure 5 As shown, the push rod 21 has a travel channel cavity 22 at one end away from the liquid cavity 1, and a placement hole 23 is provided on one side of the inner wall of the travel channel cavity 22. The placement hole 23 has an avoidance hole 24 at one end away from the injection cavity.

[0050] Preferred, see Figure 3 As shown, the injection chamber 3 is equipped with a needleless injection head 7. The one-way valve of the drug storage chamber 4 is connected to a Luer connector 8, which is connected to the injection needle tube 81. Specifically, the needleless injection head 7 has a first sealing element 71 on its outer side, which abuts against the inner wall of the injection chamber 3 to seal it, and the Luer connector 8 has a second sealing element 82 on its outer side.

[0051] 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, It includes a medicine tube with a medicine liquid chamber, one end of which is provided with a pressurization chamber and the other end with an injection chamber. A push rod is provided in the pressurization chamber, and the side wall of the medicine liquid chamber is connected to the medicine liquid storage chamber. A valve chamber is provided at the junction of the drug solution chamber and the injection chamber, as well as at the junction of the drug solution chamber and the drug solution storage chamber, and a one-way valve is provided in the valve chamber. The one-way valve includes a pin and a valve core. The pin includes a guide rod and a sealing part. The guide rod is sleeved with the valve core. An elastic element is provided between the sealing part and the valve core. The valve core has a liquid delivery channel connecting its upper surface and bottom surface. The sealing part can block the connection between the liquid inlet of the valve cavity and the liquid delivery channel.

2. The continuous needle-free injector as described in claim 1, characterized in that, The valve core has a guide channel at its center that connects its upper surface and bottom surface, and the liquid delivery channels are evenly distributed circumferentially on the valve core with the center of the guide channel as the center. The end of the guide rod extends into the guide channel, and the guide rod can slide relative to the guide channel.

3. The continuous needle-free injector as described in claim 2, characterized in that, The elastic element is sleeved on the guide rod, one end of the elastic element abuts or connects to the sealing part, and the other end abuts or connects to the surface of the valve core; There is a predetermined distance between the sealing part and the inner wall of the valve cavity.

4. The continuous needle-free injector as described in claim 1, characterized in that, The valve chamber extends from the liquid inlet to the liquid outlet and includes a first valve chamber, a second valve chamber, and a third valve chamber that are interconnected. A first step is provided at the junction of the first valve chamber and the second valve chamber, and a second step is provided at the junction of the second valve chamber and the third valve chamber. The valve core is located in the third valve chamber and abuts against the second stepped portion, the ejector pin is located in the second valve chamber, and the sealing portion can abut against the first stepped portion.

5. The continuous needle-free injector as described in claim 4, characterized in that, A sealing ring is provided on the outer side of the sealing part, and the sealing ring can abut against the first stepped part.

6. The continuous needle-free injector as described in claim 5, characterized in that, The sealing surface of the first stepped portion is inclined toward the first valve cavity; When the sealing ring abuts and seals with the first stepped portion, the sealing end of the sealing portion can extend into the first valve cavity, and the cross-sectional area of ​​the sealing end gradually decreases from the top to the bottom.

7. The continuous needle-free injector as described in claim 1, characterized in that, The junction of the pressurization chamber and the liquid medicine chamber, as well as the junction of the valve chamber and the liquid medicine chamber of the liquid medicine storage chamber, are provided with transition chambers, the cross-sectional area of ​​which gradually decreases from top to bottom.

8. The continuous needle-free injector as described in claim 1, characterized in that, The push rod has a travel channel cavity at one end away from the liquid cavity, a placement hole is provided on one inner wall of the travel channel cavity, and an avoidance hole is provided at the end of the placement hole away from the injection cavity.

9. The continuous needle-free injector as described in claim 1, characterized in that, The injection chamber is equipped with a needle-free injection head.

10. The continuous needle-free injector as described in claim 1, characterized in that, The one-way valve of the drug storage chamber is connected to a Luer connector, which is connected to the injection needle tube.

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