A high sharpness injection needle

Abstract

The utility model discloses a high sharpness injection needle, including needle tube and needle tip, the needle tip adopts three -stage tapering type multi -edge surface structure, and this three -stage tapering type multi -edge surface structure is composed of main cutting part, transition part and micro blade part, the main cutting part includes three symmetrical distribution's first inclined plane, and every first inclined plane bifurcates two second inclined planes to form transition part, and every second inclined plane bifurcates two third inclined planes to form micro blade part, the needle tip surface is equipped with a plurality of micro -groove, and the third inclined plane intersection of on micro blade part forms nanometer -class blade edge, and this blade edge edge is equipped with periodic micro sawtooth. The utility model discloses a needle tip is three -stage tapering type multi -edge surface structure, and the puncture resistance is reduced in stages, and the pain feeling is reduced, sets up micro sawtooth and can reduce the tissue contact area through " point cutting", and the local stress concentration when puncturing, and then delay passivation, sets up micro -groove and can guide the tissue fluid flow, destroys the negative pressure adsorption effect, and improves the needle insertion smoothness.

Description

Technical Field

[0001] This utility model relates to the field of river demarcation technology, and in particular to a high-sharpness injection needle. Background Technology

[0002] Traditional injection needles typically use a beveled cutting process for the needle tip, but when repeatedly puncturing or targeting high-density tissues (such as thick epidermis), problems such as high puncture resistance and needle tip dulling can easily occur, leading to increased pain for the patient.

[0003] Although there are designs in the existing technology that improve the geometry of the needle tip (such as double bevels or multi-faceted surfaces), the following problems still exist: the sharpness of the needle tip decreases significantly with the number of uses; the tissue deforms to a high degree during puncture, which can easily cause tissue damage; and the surface friction of the needle tip is high, which leads to unsmooth needle insertion.

[0004] To address this issue, we propose a high-sharpness injection needle. Utility Model Content

[0005] The purpose of this invention is to provide a high-sharpness injection needle to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A high-sharpness injection needle includes a needle tube and a needle tip. The needle tip adopts a three-stage tapered multi-faceted structure, which consists of a main cutting section, a transition section, and a micro-cutting section. The main cutting section includes three symmetrically distributed first inclined surfaces. Each first inclined surface branches into two second inclined surfaces to form a transition section. Each second inclined surface branches into two third inclined surfaces to form a micro-cutting section. The surface of the needle tip is provided with several micro-grooves. The intersection of the third inclined surfaces on the micro-cutting section forms a nanoscale cutting edge with periodic micro-serrations. The outer surfaces of the needle tube and the needle tip are provided with a reinforcing coating, and the inner surfaces of the needle tube and the needle tip are provided with a polishing layer.

[0008] In a further embodiment, the length of the main cutting part is half the length of the needle tip, and the inclination angle of the first inclined surface of the main cutting part is 25-30°.

[0009] In a further embodiment, the length of the transition portion is 3 / 10 of the needle tip length, and the inclination angle of the second inclined surface of the transition portion is 15-20°.

[0010] In a further embodiment, the length of the micro-blade is 1 / 5 of the needle tip length, and the inclination angle of the third inclined surface of the micro-blade is 5-8°.

[0011] In a further embodiment, the depth of the microgrooves is 10-20 μm.

[0012] In a further embodiment, the reinforcing coating is a titanium nitride coating with a thickness of 50-100 nm and a hardness ≥2000 HV.

[0013] In a further embodiment, the inner walls of the needle tube and needle tip are electrolytically polished to form a polished layer, and Ra≤0.05μm.

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

[0015] This invention features a three-tiered, tapered, multi-faceted needle tip to progressively reduce puncture resistance. The micro-blade, by reducing its angle, prioritizes cutting over pushing away tissue, thus minimizing pain. A reinforcing coating enhances wear resistance. Micro-serrations reduce tissue contact area through point cutting, concentrating localized stress during puncture and delaying dulling. Microgrooves guide tissue fluid flow, disrupting negative pressure adsorption and improving needle insertion smoothness. A polished layer reduces drug adhesion and minimizes injection pressure fluctuations. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the needle tip structure of this utility model;

[0018] Figure 3 This is a top view of the needle tip structure of this utility model;

[0019] Figure 4 This is a schematic diagram of the front cross-sectional structure of the needle tip of this utility model;

[0020] Figure 5 This utility model Figure 4 A magnified schematic diagram of the structure at point A in the middle.

[0021] In the figure: 1. Needle tube; 2. Needle tip; 21. Main cutting part; 22. Transition part; 23. Micro-blade part; 24. Orifice; 25. Micro-groove; 26. Micro-serration; 3. Reinforcing coating; 4. Polishing layer. Detailed Implementation

[0022] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0023] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Please see Figure 1-5A high-sharpness injection needle includes a needle tube 1 and a needle tip 2. The needle tip 2 adopts a three-stage tapered multi-faceted structure, which consists of a main cutting section 21, a transition section 22, and a micro-blade section 23. The main cutting section 21 is the initial segment near the root of the needle tube 1, and its length is half the length of the needle tip 2. The transition section 22 is located in the middle segment, and its length is three-tenths of the length of the needle tip 2. The micro-blade section 23 is the most acute point, and its length is one-fifth of the length of the needle tip 2. The main cutting section 21 includes three symmetrically distributed first inclined surfaces with an inclination angle of 25-30°. The first inclined surface has an opening 24 that communicates with the inner channel of the needle tube 1. Each first inclined surface branches into two second inclined surfaces to form a transition section 22. The inclination angle of the second inclined surface is 15-20°. Each second inclined surface branches into two third inclined surfaces to form a micro-blade section 23. The inclination angle of the third inclined surface is 5-8°. If it is cut axially from the needle tip, its structure is similar to a stepped pyramid. The cross-sectional area of ​​each level is reduced to 1 / 3-1 / 2 of the previous level, and the number of facets increases step by step to achieve graded reduction of puncture resistance. The micro-blade surface achieves "cutting priority" rather than "pushing tissue" by reducing the inclination angle, avoiding excessive tissue compression and reducing pain.

[0026] The surface of the needle tip 2 has several microgrooves 25 with a depth of 10-20μm. The microgrooves 25 can guide the flow of tissue fluid, reduce the adsorption force, and improve the smoothness of needle insertion.

[0027] The intersection of the third inclined surfaces on the micro-blade 23 forms a nanoscale cutting edge, and the edge of the cutting edge is provided with periodic micro-serrations 26. During puncture, the micro-serrations 26 cause local stress concentration, thereby delaying passivation.

[0028] The outer surfaces of the needle tube 1 and the needle tip 2 are provided with a reinforcing coating 3, which is a titanium nitride coating with a thickness of 50-100nm and a hardness of ≥2000HV.

[0029] The inner surfaces of the needle tube 1 and the needle tip 2 are provided with a polishing layer 4, which is formed by electrolytic polishing of the inner walls of the needle tube 1 and the needle tip 2. The polishing layer 4 has Ra≤0.05μm, which can reduce the adhesion of the drug solution and reduce the fluctuation of the injection pressure.

[0030] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0031] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A high-sharpness injection needle, comprising a needle tube (1) and a needle tip (2), characterized in that: The needle tip (2) adopts a three-level tapered multi-faceted structure, which consists of a main cutting part (21), a transition part (22) and a micro-edge part (23). The main cutting part (21) includes three symmetrically distributed first inclined surfaces. Each first inclined surface branches into two second inclined surfaces to form the transition part (22). Each second inclined surface branches into two third inclined surfaces to form the micro-edge part (23). The surface of the needle tip (2) is provided with several micro-grooves (25). The intersection of the third inclined surfaces on the micro-edge part (23) forms a nano-scale cutting edge. The edge of the cutting edge is provided with periodic micro-serrations (26). The outer surfaces of the needle tube (1) and the needle tip (2) are provided with a reinforcing coating (3), and the inner surfaces of the needle tube (1) and the needle tip (2) are provided with a polishing layer (4).

2. The high-sharpness injection needle according to claim 1, characterized in that: The length of the main cutting part (21) is half the length of the needle tip (2), and the inclination angle of the first inclined surface of the main cutting part (21) is 25-30°.

3. The high-sharpness injection needle according to claim 1, characterized in that: The length of the transition section (22) is 3 / 10 of the length of the needle tip (2), and the inclination angle of the second inclined surface of the transition section (22) is 15-20°.

4. The high-sharpness injection needle according to claim 1, characterized in that: The length of the micro-blade (23) is 1 / 5 of the length of the needle tip (2), and the inclination angle of the third inclined surface of the micro-blade (23) is 5-8°.

5. The high-sharpness injection needle according to claim 1, characterized in that: The depth of the microgroove (25) is 10-20 μm.

6. The high-sharpness injection needle according to claim 1, characterized in that: The strengthening coating (3) is a titanium nitride coating with a thickness of 50-100 nm and a hardness of ≥2000 HV.

7. A high-sharpness injection needle according to claim 1, characterized in that: The inner walls of the needle tube (1) and the needle tip (2) are electrolytically polished to form a polishing layer (4), and Ra≤0.05μm.

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