Injection needle with injection depth adjusted by pressure

Abstract

The utility model discloses an injection needle capable of adjusting injection depth by pressure, which belongs to the technical field of medical instruments and comprises an injection needle seat and an injection needle body, the injection needle seat is fixedly connected with the injection needle body, and a liquid inlet hole is arranged on the injection needle seat. The injection needle body is provided with a middle cavity and a plurality of adjusting holes, the liquid inlet hole is communicated with the middle cavity, the middle cavity is communicated with the adjusting holes, and an injection needle inner cavity is defined by the liquid inlet hole, the middle cavity and the adjusting holes; a needle length adjusting assembly in sliding connection with each adjusting hole is arranged in the adjusting hole, the upper end of each needle length adjusting assembly is communicated with the middle cavity, and the lower end of each needle length adjusting assembly is exposed out of the injection needle body. Under the condition that the skin surface is uneven or the injection angle is inclined, the depth consistency when the steel needle injects liquid medicine into the skin can be achieved.

Description

Technical Field

[0001] The utility model relates to a pressure-adjustable injection-depth injection needle, belonging to the technical field of medical devices. Background Art

[0002] In medical practice, subcutaneous injection is a common drug delivery method. When traditional multi-needle injection needles are used for subcutaneous injection, an important problem often arises: when the skin surface at the injection site is uneven or the injection is tilted during the injection process, the individual steel needles on the multi-needle injection needle will penetrate the skin to different depths. This inconsistency in injection depth not only affects the uniform distribution and absorption efficiency of the drug but may also increase the discomfort of the patient. This problem is particularly prominent in the multi-needle injection needles of the prior art, limiting their effectiveness and safety in clinical applications.

[0003] Existing solutions mostly focus on the standardized training of injection techniques and the improvement of injection equipment, but these methods often fail to fundamentally solve the problem of inconsistent injection depth caused by uneven skin surface or deviation in the operation angle.

[0004] Therefore, developing a multi-needle injection needle with a simple structure, low cost, easy operation, and capable of automatically adjusting the injection depth to solve the above problems has become a technical problem urgently to be solved by those skilled in the art. Summary of the Utility Model

[0005] The technical problem to be solved by the utility model is: to overcome the deficiencies of the prior art and provide a pressure-adjustable injection-depth injection needle, which can achieve the depth consistency when injecting the liquid medicine into the dermis with the steel needles in the case of uneven skin surface or tilted injection angle.

[0006] The technical solution adopted by the utility model to solve the problems it exists is:

[0007] A pressure-adjustable injection-depth injection needle includes an injection needle hub and an injection needle body. The injection needle hub is fixedly connected to the injection needle body. The injection needle hub is provided with a liquid inlet hole. The injection needle body is provided with an intermediate cavity and a plurality of adjustment holes. The liquid inlet hole is communicated with the intermediate cavity, and the intermediate cavity is communicated with the plurality of adjustment holes. The liquid inlet hole, the intermediate cavity, and the plurality of adjustment holes enclose to form an injection needle inner cavity;

[0008] Each adjustment hole is provided with a needle length adjustment assembly that is hermetically and slidably connected to the adjustment hole. The upper end of the needle length adjustment assembly is communicated with the intermediate cavity, and the lower end is exposed outside the injection needle body.

[0009] Preferably, the needle length adjustment assembly includes a steel needle. The steel needle is a hollow tubular structure, and a steel needle mounting body is sleeved on the steel needle. The steel needle is fixedly connected to the steel needle mounting body.

[0010] Preferably, a limiting block is fixed on the outer cylindrical surface of the steel needle installation body, a reamed hole is provided in the adjusting hole, the diameter of the reamed hole is larger than that of the adjusting hole, the limiting block is slidably arranged in the reamed hole, and the thickness of the limiting block is smaller than the length of the reamed hole.

[0011] Preferably, a lubricating coating is provided on the inner wall of the adjusting hole.

[0012] Preferably, the material of the steel needle installation body is medical-grade plastic or stainless steel.

[0013] Preferably, the material of the steel needle is stainless steel.

[0014] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0015] The present utility model adopts an innovative design of automatically adjusting the injection depth by pressure balance. The injection depth is automatically adjusted through the pressure balance mechanism, ensuring that even when the skin surface is uneven or the injection angle is inclined, the depth consistency can be achieved when the steel needle injects the liquid medicine into the dermis. This significantly improves the accuracy of drug injection and helps the uniform distribution and absorption of the drug.

[0016] The precise control of the injection depth reduces the discomfort of patients caused by inconsistent injection depths, improves the injection experience of patients, and is of great significance for promoting the progress of medical injection technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a structural diagram of an injection needle for adjusting the injection depth by pressure of the present utility model;

[0018] Figure 2 is a full cross-sectional view of an injection needle for adjusting the injection depth by pressure of the present utility model.

[0019] In the figure:

[0020] 1. Injection needle seat, 101. Liquid inlet hole, 2. Injection needle body, 201. Intermediate cavity, 202. Adjusting hole, 203. Reamed hole, 3. Needle length adjusting assembly, 301. Steel needle installation body, 302. Limiting block, 303. Steel needle. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] This specification and the claims do not use the difference in names as a way to distinguish components, but rather use the difference in the functions of components as the criterion for distinction. In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "front", "rear", "left", "right", "horizontal", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. In the present utility model, unless otherwise clearly specified and defined, terms such as "installed", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0022] As Figure 1 and Figure 2 shown, a pressure-adjustable injection-depth injection needle includes an injection needle hub 1 and an injection needle body 2. The injection needle hub 1 is fixedly connected to the injection needle body 2. The injection needle hub 1 is provided with a liquid inlet hole 101. In order to make the connection between the syringe and the pressure-adjustable injection-depth injection needle tighter and the injection needle not easily fall off the syringe, the liquid inlet hole 101 is designed as a tapered through hole. The injection needle body 2 is provided with an intermediate cavity 201, which is located below the liquid inlet hole 101. A number of adjustment holes 202 are provided below the intermediate cavity 201. The liquid inlet hole 101 is communicated with the intermediate cavity 201, and the intermediate cavity 201 is communicated with a number of adjustment holes 202. The liquid inlet hole 101, the intermediate cavity 201, and a number of adjustment holes 202 enclose to form an injection needle inner cavity.

[0023] In each adjustment hole 202, there is a needle length adjustment assembly 3 that is hermetically and slidably connected to the adjustment hole 202. The upper end of the needle length adjustment assembly 3 is communicated with the intermediate cavity 201, and the lower end extends out of the injection needle body 2.

[0024] The needle length adjustment assembly 3 includes a steel needle 303. The steel needle 303 is a hollow tubular structure and is made of stainless steel. A steel needle mounting body 301 is sleeved on the steel needle 303. The steel needle mounting body 301 is made of medical-grade plastic or stainless steel. The steel needle 303 is fixedly connected to the steel needle mounting body 301. A limiting block 302 is fixed on the outer circumferential surface of the steel needle mounting body 301.

[0025] An enlarged hole 203 is provided in the adjustment hole 202. The diameter of the enlarged hole 203 is larger than that of the adjustment hole 202. The limit block 302 is slidably arranged in the enlarged hole 203. The thickness of the limit block 302 is less than the length of the enlarged hole 203. The upper and lower end faces of the enlarged hole 203 are used to limit the up and down movement range of the limit block 302, that is, to limit the up and down movement range of the needle length adjustment assembly 3. The inner wall of the adjustment hole 202 is provided with a lubricating coating to reduce friction and wear when the steel needle mounting body 301 slides inside it.

[0026] When installing the pressure-adjusted injection-depth injection needle on the syringe for injection, since the needle length adjustment assembly 3 can freely slide up and down in the adjustment hole 202 of the pressure-adjusted injection-depth injection needle, when the skin at the injection position is uneven or the injection force is inclined, due to the fact that the inner cavity of the injection needle is completely connected, according to the principle of fluid mechanics, when a certain steel needle 303 penetrates the skin too deep, the pressure received by its tip will be transmitted to other needle length adjustment assemblies through the liquid in the inner cavity. At the same time, according to the principle of pressure balance in the cavity, the needle length adjustment assembly 3 where the steel needle 303 that penetrates the skin too deep is located will slide towards the inner cavity side of the injection needle under the action of pressure, thereby shortening the penetration depth of the steel needle 303. This process will continue until the pressures received by all the steel needles 303 reach balance, that is, the penetration depths of all the steel needles 303 into the skin are basically the same.

[0027] The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art to which it pertains, various changes can be made without departing from the gist of the present invention.

Claims

1. A pressure-regulated injection depth injection needle, comprising an injection needle seat (1) and an injection needle body (2), wherein the injection needle seat (1) and the injection needle body (2) are fixedly connected, characterized in that: The injection needle seat (1) is provided with a liquid inlet hole (101), the injection needle body (2) is provided with an intermediate cavity (201) and a plurality of adjustment holes (202), the liquid inlet hole (101) is connected to the intermediate cavity (201), the intermediate cavity (201) is connected to the plurality of adjustment holes (202), and the liquid inlet hole (101), the intermediate cavity (201) and the plurality of adjustment holes (202) are surrounded to form an injection needle inner cavity; Each adjustment hole (202) is provided with a needle length adjustment component (3) which is sealingly and slidably connected to the adjustment hole (202); the upper end of the needle length adjustment component (3) is communicated with the middle cavity (201), and the lower end is exposed outside the injection needle body (2).

2. The pressure-regulated injection depth injection needle according to claim 1, characterized in that: The needle length adjustment assembly (3) comprises a steel needle (303), the steel needle (303) being a hollow tubular structure, a steel needle mounting body (301) being sleeved on the steel needle (303), and the steel needle (303) being fixedly connected to the steel needle mounting body (301).

3. The pressure-regulated injection depth injection needle according to claim 2, characterized in that: A limiting block (302) is fixed on the outer circumferential surface of the steel needle mounting body (301); an expanded hole (203) is provided in the adjusting hole (202); the diameter of the expanded hole (203) is larger than the diameter of the adjusting hole (202); the limiting block (302) is slidably arranged in the expanded hole (203); and the thickness of the limiting block (302) is smaller than the length of the expanded hole (203).

4. The pressure-regulated injection depth injection needle according to claim 3, characterized in that: The inner wall of the adjustment hole (202) is provided with a lubricating coating.

5. The pressure-regulated injection depth injection needle according to claim 4, characterized in that: The steel needle mounting body (301) is made of medical-grade plastic or stainless steel.

6. The pressure-regulated injection depth injection needle according to claim 5, characterized in that: The steel needle (303) is made of stainless steel.

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