A continuous needleless injector

Abstract

The utility model discloses a continuous needleless injector, including medicine pipe, it has medicine liquid chamber, one end of medicine liquid chamber is equipped with pressurizing chamber, and the other end is equipped with injection chamber, and the push rod is equipped in pressurizing chamber, and the lateral wall of medicine liquid chamber is communicated 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, and one -way valve is equipped in valve chamber, one -way valve includes valve core, and valve core includes sealing portion and valve core seat, sealing portion is equipped with the sealing gasket that can carry out elastic deformation, the liquid collection chamber that is communicated with liquid output port of valve chamber is equipped in valve core seat, and its outer wall is equipped with the liquid delivery path that is communicated with liquid collection chamber, and sealing gasket, valve core seat's outer wall and valve chamber's inner wall form liquid transition chamber, and liquid transition chamber is communicated with liquid delivery path, when sealing gasket and valve chamber inner wall abutment seal, can block liquid transition chamber and liquid inlet of valve chamber's communication. Can simplify the structure, promote accuracy and response speed.

Description

Technical Field

[0001] This utility model relates to the field of medical devices, 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 into the patient's skin, subcutaneous tissue, or muscle through a micro-hole at the tip, thus sparing the patient the pain of needle pricks.

[0003] Existing needle-free injectors have one-way valves facing opposite directions at both the injection head and the supply end. When liquid supply is needed, the injection head is closed and the supply end is open; when injection is needed, the supply end is closed and the injection head is open, allowing switching between liquid supply and injection. The one-way valve used in existing injectors consists of a conical orifice, a steel ball located at the conical orifice, and a return spring. The return spring presses the steel ball against the conical orifice to achieve unidirectional liquid flow.

[0004] The above-mentioned one-way valve structure has the following disadvantages: (1) The dynamic sealing is unreliable. During the high-pressure injection stage, the steel ball is prone to inertial displacement, which can lead to sealing failure. The return flow of the drug can reach more than 5% of the total dose, causing dosage error; (2) The one-way valve has many parts and a complex structure, which increases the manufacturing cost and poses a risk of valve ball jamming, greatly reducing the sealing stability; (3) The one-way valve requires liquid pressure to push the valve core to the position of sealing release, resulting in slow injection phase speed. 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 simple structure, fast injection response speed and high operation 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 valve core, which includes a sealing part and a valve core seat. The sealing part is provided with a sealing gasket capable of elastic deformation. The valve core seat has a liquid collection chamber communicating with the liquid outlet of the valve cavity, and its outer wall has a liquid delivery channel communicating with the liquid collection chamber. The sealing gasket, the outer wall of the valve core seat, and the inner wall of the valve cavity form a liquid transition chamber, which is in communication with the liquid delivery channel.

[0009] When the sealing gasket abuts against the inner wall of the valve cavity to seal, it blocks the connection between the liquid transition cavity and the liquid inlet of the valve cavity.

[0010] As an improvement to the above technical solution, the sealing gasket is inclined toward the liquid outlet of the valve cavity.

[0011] As an improvement to the above technical solution, the angle between the tilting direction of the sealing gasket and the axial direction of the valve core is α, where 30°≤α≤60°.

[0012] As an improvement to the above technical solution, the top of the sealing part is provided with an installation limiting part, and the installation limiting part is provided with a guide groove, which is connected to the liquid inlet of the valve chamber;

[0013] The mounting limiting part abuts against the top of the valve cavity, and the valve core seat abuts against the bottom of the valve cavity;

[0014] When the sealing gasket abuts against the inner wall of the valve cavity, it can block the connection between the liquid transition cavity and the guide groove.

[0015] As an improvement to the above technical solution, the valve chamber from the liquid inlet to the liquid outlet includes a first valve chamber and a second valve chamber that are connected to each other in sequence. The installation limiting part is located in the first valve chamber, and the sealing part and the valve core seat are located in the second valve chamber.

[0016] The junction between the first valve chamber and the second valve chamber has a stepped portion, and the convex corner of the stepped portion is an arc surface, which is opposite to the position of the guide groove.

[0017] As an improvement to the above technical solution, the valve cavity, sealing part, valve core seat and liquid collection cavity are coaxially arranged, and the liquid delivery channel is evenly distributed circumferentially on the valve core seat with the center of the liquid collection cavity as the center.

[0018] As an improvement to the above technical solution, the axial direction of the liquid conveying channel and the axial direction of the liquid collecting chamber are β, where 45°≤β≤90°.

[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] This utility model discloses a one-way valve, including a valve core, which comprises a sealing part and a valve core seat. The sealing part is equipped with a sealing gasket capable of elastic deformation. The valve core seat contains a liquid collection chamber communicating with the liquid outlet of the valve cavity, and its outer wall has a liquid delivery channel communicating with the liquid collection chamber. The sealing gasket, the outer wall of the valve core seat, and the inner wall of the valve cavity form a liquid transition chamber, which communicates with the liquid delivery channel. Firstly, this one-way valve controls the flow between the liquid transition chamber and the liquid inlet of the valve cavity by whether the sealing gasket abuts against the inner wall of the valve cavity. A dynamic sealing surface is formed on the inner wall of the valve cavity. This solves the problem of backflow or leakage caused by poor sealing due to wear or impurities. Secondly, the liquid transition chamber and the liquid delivery channel establish a continuous fluid path, allowing the liquid to flow from the liquid inlet through the liquid transition chamber and the liquid delivery channel into the liquid collection chamber, and finally to the liquid outlet. This structure reduces fluid dead zones and turbulence, lowering flow resistance. Finally, the integrated design of the liquid collection chamber and the liquid delivery channel ensures that the liquid is completely guided to the liquid outlet, reducing residual liquid in the valve cavity. This avoids problems of cross-contamination or inaccurate dosage when injecting medication. 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 middle;

[0026] Figure 3 This is a front view of a valve core according to an embodiment of this utility model;

[0027] Figure 4 This is a cross-sectional view of the valve core 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 and Figure 2 As shown, this utility model embodiment provides a continuous needle-free injector, including a medicine tube 1', which has a medicine liquid chamber 1. One end of the medicine liquid chamber 1 is provided with a pressure chamber 2, and the other end is provided with an injection chamber 3. A push rod 21 is provided in the pressure chamber 2. The side wall of the medicine liquid chamber 1 is connected to the medicine liquid 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 utility model embodiment improves the structure of the one-way valve 6 to enhance the operating accuracy and injection response speed of the syringe.

[0033] Specifically, the one-way valve 6 includes a valve core, which includes a sealing part 61 and a valve core seat 62; the sealing part 61 is provided with a sealing gasket 63 capable of elastic deformation; the valve core seat 62 is provided with a liquid collection chamber 64 communicating with the liquid outlet of the valve cavity 5, and its outer wall is provided with a liquid delivery channel 65 communicating with the liquid collection chamber 64; the sealing gasket 63, the outer wall of the valve core seat 62 and the inner wall 5 of the valve cavity form a liquid transition chamber 66, which is connected to the liquid delivery channel 65;

[0034] When the sealing gasket 63 abuts against the inner wall of the valve cavity 5 to seal, it blocks the connection between the liquid transition cavity 66 and the liquid inlet of the valve cavity 5.

[0035] Working principle of this utility model embodiment:

[0036] During injection, the push rod 21 of the pressurizing chamber 2 slides towards the drug chamber 1, increasing the drug pressure in both chambers. This causes the pressure in the one-way valve 6 at the injection chamber 3 to rise, and the sealing gasket 63 at this location bends and deforms towards the injection chamber 3, connecting the liquid transition chamber 66 to the liquid inlet. High-pressure liquid then enters the liquid collection chamber 64 and is finally ejected from the injection chamber 3 through the liquid outlet. After injection, the push rod 21 moves away from the drug chamber 1, causing a rapid drop in pressure in both chambers. This reduces the pressure in the liquid transition chamber 66 at the drug storage chamber 4, deforming the sealing gasket 63 at this location due to the pressure difference. This releases the seal against the inner wall of the valve chamber 5, connecting the liquid transition chamber 66 to the liquid inlet. High-pressure liquid then enters the liquid collection chamber 64 and is finally ejected into the drug chamber through the liquid outlet to replenish the drug.

[0037] First, the one-way valve 6 controls the flow between the liquid transition chamber 66 and the liquid inlet of the valve chamber 5 by checking whether the sealing gasket 63 abuts against the inner wall of the valve chamber 5. A dynamic sealing surface is formed on the inner wall of the valve chamber 5. This solves the problem of backflow or leakage caused by poor sealing due to wear or impurities. Second, the liquid transition chamber 66 and the liquid delivery channel 65 establish a continuous fluid path, allowing the liquid to flow from the liquid inlet through the liquid transition chamber 66 and the liquid delivery channel 65 into the liquid collection chamber 64, and finally to the liquid outlet. This structure reduces fluid dead zones and turbulence, lowering flow resistance. Finally, the integrated design of the liquid collection chamber 64 and the liquid delivery channel 65 ensures that the liquid is completely guided to the liquid outlet, reducing residual liquid in the valve chamber 5. This avoids cross-contamination or inaccurate dosage during injection.

[0038] Preferred, see Figure 4 As shown, the sealing gasket 63 is inclined toward the liquid outlet of the valve cavity 5. The inclination of the sealing gasket 63 toward the liquid outlet guides the liquid to flow directionally along the surface of the sealing gasket 63 toward the liquid outlet, reducing liquid stagnation or deviation and significantly improving drainage efficiency. Furthermore, the inclined structure of the sealing gasket 63 makes progressive contact with the inner wall of the valve cavity 5, reducing instantaneous frictional impact and preventing gasket deformation or cracking caused by localized stress concentration.

[0039] More preferably, the angle between the inclination direction of the sealing gasket 63 and the axial direction of the valve core is α, where 30°≤α≤60°. This allows the fluid to smoothly turn towards the outlet along the gasket surface, reducing kinetic energy loss caused by sudden expansion / contraction and significantly reducing pressure loss along the flow path.

[0040] In some embodiments, see Figure 3 As shown, the top end of the sealing part 61 is provided with an installation limiting part 67, and the installation limiting part 67 is provided with a guide groove 68, which is connected to the liquid inlet of the valve chamber 5.

[0041] The mounting limiting part 37 abuts against the top of the valve cavity 5, and the valve core seat 62 abuts against the bottom of the valve cavity 5;

[0042] When the sealing gasket 63 abuts against the inner wall of the valve chamber 5, it can block the connection between the liquid transition chamber 66 and the guide groove 68.

[0043] The aforementioned flow guide 68 can redirect the liquid flowing from the liquid inlet to a radial flow before it flows to the sealing gasket 63, avoiding direct impact on the sealing gasket 63 and reducing turbulent energy dissipation caused by sudden expansion / contraction structures. In addition, the flow guide 68 guides the fluid to diffuse smoothly, significantly reducing local pressure loss.

[0044] Preferably, the valve cavity 5 includes a first valve cavity 51 and a second valve cavity 52 that are sequentially and mutually connected from the liquid input port to the liquid output port. The installation limiting portion 67 is located in the first valve cavity 51, and the sealing portion 61 and the valve core seat 62 are located in the second valve cavity 52;

[0045] There is a stepped portion 53 at the junction of the first valve cavity 51 and the second valve cavity 52. The convex corner of the stepped portion 53 is an arc surface and is opposite to the position of the diversion groove 68.

[0046] The convex corner of the stepped portion 53 being an arc surface can solve the problem of the liquid medicine colliding with the stepped portion 53 after flowing out of the diversion groove 68 and generating eddy currents, reduce the eddy current intensity, and significantly reduce the local resistance loss.

[0047] In some embodiments, the valve cavity 5, the sealing portion 61, the valve core seat 63, and the liquid collection cavity 64 are coaxially arranged. The liquid delivery channels 65 are circumferentially and uniformly distributed on the valve core seat 62 with the center of the liquid collection cavity 64 as the center of the circle.

[0048] First, the liquid delivery channels 65 being circumferentially and uniformly distributed with the center of the liquid collection cavity 64 as the center of the circle can ensure that the liquid medicine enters the liquid collection cavity 64 from multiple directions simultaneously, avoiding the problem of uneven distribution of the liquid medicine caused by inflow in a single direction. Second, the design of multi-channel uniform distribution helps to disperse the pressure fluctuations generated during the flow of the liquid medicine, enabling the one-way valve 6 to maintain a stable working state under high pressure.

[0049] Preferably, the axial direction of the liquid delivery channel 65 and the axial direction of the liquid collection cavity 64 are β, and 45° ≤ β ≤ 90°. The above angle setting can improve the conversion efficiency of kinetic energy into pressure energy. Optimally, when β = 90° (perpendicular incidence), the liquid medicine vertically impacts the wall surface of the liquid collection cavity 64, and the fluid kinetic energy is maximally converted into local pressure energy, increasing the pressure of the liquid flowing out of the one-way valve 6.

[0050] In some embodiments, as shown in Figure 5 a stroke channel cavity 22 is provided at one end of the push rod 21 away from the liquid medicine cavity 1. A placement hole 23 is provided on one inner wall of the stroke channel cavity 22, and an avoidance hole 24 is provided at one end of the placement hole 23 away from the injection cavity.

[0051] It should be noted that for the pneumatic boosting device配套 with this embodiment, its striker is installed into the stroke channel cavity 22 through the placement hole 23, and the end of the striker can be limited and fixed with the end of the stroke channel cavity 22. In addition, a plurality of first sealing rings 25 are provided on the push rod 21, and the above first sealing rings 25 can be in abutting seal with the inner wall of the pressurization cavity 2.

[0052] Preferably, the injection cavity 3 is provided with a needleless injection head 7. A second sealing ring 71 is provided on the outer side of the injection head 7, and the second sealing ring 71 abuts and seals against the inner wall of the injection cavity 3.

[0053] Preferably, the one-way valve 6 of the drug storage chamber 4 is connected to a Luer connector 8, which is connected to the injection needle tube 81. A third sealing ring 82 is provided on the outer side of the Luer connector 8, and the third sealing ring 82 abuts against the inner wall of the drug storage chamber 4. Furthermore, the injection needle tube 81 provides drug to the drug storage chamber 4, and its built-in syringe plunger can slide as the liquid level drops, solving the problem of vacuum in the drug storage chamber 4 during drug replenishment.

[0054] 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 needleless injector characterized by, The device includes a medicine tube with a medicine liquid chamber. One end of the medicine liquid chamber is provided with a pressurization chamber, and the other end is provided with an injection chamber. A push rod is provided in the pressurization chamber, and the side wall of the medicine liquid chamber is in communication with 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 valve core, which includes a sealing part and a valve core seat. The sealing part is provided with a sealing gasket capable of elastic deformation. The valve core seat has a liquid collection chamber communicating with the liquid outlet of the valve cavity, and its outer wall has a liquid delivery channel communicating with the liquid collection chamber. The sealing gasket, the outer wall of the valve core seat, and the inner wall of the valve cavity form a liquid transition chamber, which is in communication with the liquid delivery channel. When the sealing gasket abuts against the inner wall of the valve cavity to seal, it blocks the connection between the liquid transition cavity and the liquid inlet of the valve cavity.

2. The continuous needle-free injector as described in claim 1, characterized in that, The sealing gasket is inclined toward the liquid outlet of the valve cavity.

3. The continuous needle-free injector as described in claim 2, characterized in that, The angle between the inclination direction of the sealing gasket and the axial direction of the valve core is α, where 30°≤α≤60°.

4. The continuous needle-free injector of claim 1, wherein, The top of the sealing part is provided with an installation limiting part, and the installation limiting part is provided with a guide groove, which is connected to the liquid inlet of the valve chamber; The mounting limiting part abuts against the top of the valve cavity, and the valve core seat abuts against the bottom of the valve cavity; When the sealing gasket abuts against the inner wall of the valve cavity, it can block the connection between the liquid transition cavity and the guide groove.

5. The continuous needle-free injector of claim 4, wherein, The valve chamber extends from the liquid inlet to the liquid outlet and includes a first valve chamber and a second valve chamber that are connected to each other in sequence. The mounting limiting part is located in the first valve chamber, and the sealing part and the valve core seat are located in the second valve chamber. The junction between the first valve chamber and the second valve chamber has a stepped portion, and the convex corner of the stepped portion is an arc surface, which is opposite to the position of the guide groove.

6. The continuous needle-free injector of any one of claims 1-5, wherein, The valve chamber, sealing part, valve core seat and liquid collection chamber are coaxially arranged, and the liquid delivery channel is evenly distributed circumferentially on the valve core seat with the center of the liquid collection chamber as the center.

7. The continuous needle-free injector of claim 6, wherein, The axial direction of the liquid delivery channel is β, and the axial direction of the liquid collection chamber is 45°≤β≤90°.

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, and a placement hole is provided on one side of the inner wall of the travel channel cavity. The placement hole has an avoidance hole at one end away from the injection cavity.

9. The continuous needle-free injector of claim 1, wherein, The injection chamber is equipped with a needle-free injection head.

10. The continuous needle-free injector of claim 1, wherein, 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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