CN101810897B - Injection needle with spiral surface - Google Patents

Abstract

The invention relates to an injection needle with a thread shape on the surface. It is used in the field of disposable interventional medical devices for clinical infusion, sampling, puncture and other processes. It is characterized in that the surface of the injection needle is a threaded surface with a thread structure, the thread adopts an equidistant thread or a variable pitch thread, the depth (c) of the thread groove is 0.01-0.10mm, and the width (a) of the thread groove is 0.02- 0.50mm, pitch (b) greater than 1mm. Thread grooves can be inverted triangles, arcs, rectangles, etc. The purpose of adding thread shape on the surface of the needle tube is to reduce the continuous frictional resistance of the needle tube during the injection puncture process, reduce the stimulation effect of the needle tube on the subcutaneous nerve endings during the puncture process, and achieve the effect of pain relief.

Description

Injection needle with helical shape on the surface

technical field

The invention relates to an injection needle with a thread shape on the surface. It is used in the field of disposable interventional medical devices for clinical infusion, sampling, puncture and other processes.

Background technique

Intervention therapy such as infusion injection and puncture sampling is an indispensable and main treatment method in clinical medicine. However, the damage to the skin tissue and the pain caused by the instrument during the injection puncture are one of the factors that patients fear and avoid treatment. Generally speaking, human beings need to be inoculated with various vaccines from birth, and various medical treatments such as punctures and injections are required when various diseases and injuries occur. Effectively reducing the injection, puncture pain and body damage of the subject is one of the main directions of current medical device research.

At present, studies on the pain mechanism of injection and puncture have shown that the skin damage caused by the needle tip, the puncture resistance of the needle tube, and the stimulation of the subcutaneous nerve endings during puncture are the main pain sources. For the mechanism of pain, the main methods of painless injection reported are (1) microneedle technology. Represented by insulin injection needles and microneedle arrays, this painless injection needle reduces the area of skin damage and the stimulation of subcutaneous nerves by reducing the diameter of the needle tube, and even the injection needle only penetrates the epidermis during the injection process and does not reach the nerve endings Layer, and achieve painless purpose. However, this microneedle has the disadvantages of small infusion tube diameter and high manufacturing cost; (2) the sharpness of the needle tip is optimized. This is a technique commonly used in conventional injection needles at present. It uses the method of optimizing the needle tip, which can effectively reduce the puncture effect, but cannot reduce the resistance of the needle tube during the puncture process; (3) Needle-free injection. Needle-free injection is a technology that uses high-pressure jets to directly inject drug particles into the subcutaneous layer. Because there is no needle puncture process, the drug only reaches the superficial layer of the epidermis, and the requirements for the drug are high, and the implementation cost is expensive; (4) Injection techniques . In clinical nursing, the surgeon can achieve the purpose of painless injection through exquisite skills, such as local massage, increasing the puncture speed and angle, etc., which mainly depends on the skill of the operator.

Contents of the invention

The object of the present invention is to overcome the above-mentioned defects and deficiencies of the existing syringe needles, and provide an injection needle with a spiral shape on the surface. By changing the surface shape of the needle, the frictional resistance between the needle and the skin tissue is reduced during the injection puncture, thereby reducing the stimulation of the nerve endings during the injection puncture.

Above-mentioned purpose of the present invention is realized by following technical scheme, is described as follows in conjunction with accompanying drawing:

An injection needle with a spiral shape on the surface, the surface of the injection needle is a thread surface with a thread structure, the thread adopts an equidistant thread or a variable pitch thread, the depth (c) of the thread groove is 0.01-0.10mm, and the width of the thread groove is (a) is 0.02-0.50mm, and the pitch (b) is greater than 1mm.

The cross section of the thread groove is an inverted triangle, arc or rectangle.

At least one screw thread is used.

The distribution of the threads on the surface of the needle is all or part.

The surface of the present invention has a spiral-shaped injection needle, which can be used for all injection and puncture medical interventional devices used in body tissue puncture, such as intravenous injection needles, intramuscular injection needles, blood collection needles, living body sampling needles, and body fluid drainage needles. Its clinical use is the same as that of conventional injection puncture devices, and there is no special operation requirement.

Technical effect of the present invention is:

It can be applied to medical interventional devices such as intravenous infusion needles, intramuscular injection needles, blood collection needles, biopsy and other clinical medical fields such as infusion injection and puncture sampling. The injection needle reduces the frictional resistance between the needle and skin tissue by processing the threaded structure on the surface of the conventional syringe needle, so as to achieve the purpose of pain relief for injection and puncture. Generally speaking, in the process of conventional injection and puncture, the sharp needle tip cuts the skin, and the friction resistance between the needle and the skin tissue is generated. Stimulation, sensitivity to foreign materials, etc. The threaded needle disclosed by the present invention can reduce the contact area between the needle and the skin tissue during injection and puncture, eliminate the accumulation of stress stimulation caused by continuous viscous friction and reduce its stimulation intensity. When using a lubricant on the surface, Improves lubricant distribution and lubricating effect.

Description of drawings

Fig. 1 (a) is a kind of structural representation of the present invention;

Fig. 1 (b) is a partial enlarged view of the thread structure of Fig. 1 (a);

Fig. 1(c) is a partial enlarged view of Fig. 1(b) 3 (the thread groove cross-section is an inverted triangle);

Fig. 1(d) is a partial enlarged view of Fig. 1(b) 3 (the cross-section of the thread groove is arc-shaped).

Fig. 2 is a schematic diagram of the thread structure on the surface of the needle.

Figure 3 (a) is a schematic diagram of the shape of the needle surface along the horizontal stripes (large pitch);

Fig. 3 (b, c, d) are respectively A-A` sectional views of Fig. 3 (a), wherein: Fig. 3 (b) is that the cross section of the thread groove is an inverted triangle, Fig. 3 (c) is the cross section of the thread groove The cross-section is arc-shaped, and Fig. 3(d) shows that the cross-section of the thread groove is rectangular.

Figure 4 (a, b) is a schematic diagram of application in other types of injection and puncture devices.

In the accompanying drawings 1. Needle tube connection seat 2. Needle tube surface 3. Groove thread (strip) 4. Needle tip 5. Infusion set connection seat 6. Infusion set handle 7. Sub-needle

a. Groove width b. Pitch c. Groove depth.

Detailed ways

The specific content of the present invention, that is, its implementation mode, will be further described below in connection with the embodiments shown in the accompanying drawings.

An injection needle with a helical shape on the surface is composed of a needle (or puncture instrument) and a groove-shaped thread on its surface. The thread shape on the surface of the needle can be an inverted triangle, an arc, or a rectangle. The shape of the surface of the needle head can be realized by rolling in the tube material preparation process, and can also be prepared by reprocessing on the needle tube.

The thread on the surface of the needle head can be single thread with equal distance or multiple threads with variable pitch; the thread groove depth (c) ranges from 0.01-0.10mm; thread width (a) is 0.02-0.50mm; pitch (b) More than 1mm, until the thread becomes a straight shape on the surface of the injection needle; the thread distribution of the needle can occupy the entire surface of the needle tube, or it can be local.

The injection needle with a spiral shape on the surface of the present invention can be used for all injection and puncture medical interventional devices used in body tissue puncture, such as intravenous injection needles, intramuscular injection needles, blood collection needles, living body sampling needles, and body fluid drainage needles. Its clinical use is the same as that of conventional injection puncture devices, and there is no special operation requirement.

The feature of the present invention is the groove-shaped thread on the surface of the needle tube. Taking the intramuscular injection needle as an example, the surface of the injection needle (2) has a groove-shaped thread, and the thread groove area accounts for within 20% of the surface area of the needle tube, and the groove distribution can be Referring to Fig. 1, you can also refer to Fig. 3, which consists of multiple horizontal strips. In clinical use, due to the effect of the continuous groove on the surface of the needle tube, the actual contact area between the needle and the skin tissue is reduced, and the continuous friction between the needle and the skin tissue is changed into intermittent friction, which can effectively reduce the adhesion of the skin tissue to the surface of the needle. frictional resistance and stimulation of subcutaneous nerve endings. The use method of the injection needle disclosed by the invention is the same as that of conventional injection needles, and the operator has no special operation requirements when using it, and the effect of pain relief can be realized for the operator due to the reduction of puncture friction resistance.

Referring to Fig. 4, the surface thread shape can be used for intravenous infusion needles, female and female needles for biopsy and other injection and puncture devices. According to the size of the needle tube, the thread can be multiple threads, single thread, or multiple parallel strips, and the thread depression accounts for less than 20% of the surface area of the needle. Similar to the application examples of intramuscular injection needles, the purpose of injection and puncture devices such as intravenous infusion needles, female and female needles, and blood collection needles with threads on the surface is to reduce the surface contact area and state to achieve the purpose of pain relief.

If a surface lubricant is used, the groove-shaped thread shape on the surface can enhance the lubricating effect of the lubricant, further reduce puncture and frictional resistance, and then achieve the purpose of pain relief.

The surface morphology of the needle can be completed by rolling in the tube drawing process, or it can be prepared by mechanical, laser or chemical etching after the injection needle is formed.

Claims (1)

1. one kind is used to puncture and subtracts the injection needle of surface with helical structure form of pain purpose, it is characterized in that, described injection needle surface is for having the thread surface of helical structure form, screw thread adopts constant worm pich or gaining twist, screw thread groove depth (c) is 0.01-0.10mm, thread groove width (a) is 0.02-0.50mm, pitch (b) is greater than 1mm, described screw thread adopts one at least, described screw thread is whole or local being distributed as of needle surface, the thread groove cross section is a del, circular arc or rectangle, and the thread groove area accounts in the needle surface long-pending 20%.

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