Falling-chip-free needle tube and processing method thereof

Abstract

One end of the needle tube is provided with an inclined face, the inclined face surrounds an orifice of the needle tube, and the top end of the inclined face intersects with the outer circle of the cross section of the needle tube to form a puncture portion of the needle tube. The inner edge and the outer edge of the inclined surface are cambered surfaces; the invention further discloses a method for machining the needle tube, the method is A or B, a grinding machine and a polishing machine are adopted in the method A for machining, and a grinding machine and a magnetic polishing machine are adopted in the method B for machining. The cutting edge of the needle head machined through the device is smooth, safety is high, meanwhile, no dead angle exists, and cleaning is convenient.

Description

technical field [0001] The invention relates to the technical field of medical devices, in particular to a needle tube without falling debris and a processing method thereof. Background technique [0002] Clinically, it is a common way to use syringes with needles to prepare medicinal solutions. At present, the needle tubes used in injection dispensers are widely used in stainless steel needle tubes, and the earlier ones are the well-known and very common stainless steel needle tubes with a three-slope needle point. The advantages are: ①The needle tube orifice is straight through, and there is no dead angle for cleaning , ②The extraction and filling of the liquid medicine are clean and thorough without residue, ③The flow of the liquid medicine at the orifice of the needle tube is very sufficient. The disadvantage is that the needle tip is very sharp, which is easy to accidentally scratch and stab medical and recycling operators. When dispensing and puncturing, the inner edg...

AI Technical Summary

Problems solved by technology

However, people have also found many shortcomings in production and use: ①Because of the opening on the side, the distance between the orifice and the tip of the needle is about 5mm to 6mm, and the orifice cannot fit the inner wall of the medicine bottle, so the medicine bottle The liquid medicine at the bottom is not easy to extract cleanly, it is easy to cause waste of liquid medicine, and it will pollute the environment. ②When adding medicine, because the needle tip is a hollow cone, there will be a small amount of liquid medicine remaining in the cavity. ③Due to the processing link There are more, and other defects are prone to appear, such as deformation, indentation, tip wrinkles, tip cracks, orifice deformation, no orifice, etc. on the surface of the needle tube. ④ Since the inside of the needle tip is a cone cavity, this forms A cleaning dead angle, the foreign matter in the cavity produced during the needle point processing and cleaning can not be cleaned thoroughly, and there is a certain medical hidden danger

[0003] At present, the bright effect of the outer surface of all dispensing needle tubes is processed by a roller polishing machine and a mechanical polishing machine that arranges and rolls the needle tubes, but the inner hole wall of the needle tube is not polished, so the inner hole wall of the needle tube is just There is no bright effect. Generally, the inner hole wall of the needle tube is a bit rough. These polishing methods can only make the outer edge of the needle tube mouth surface smooth, but have no polishing effect on the edge of the inner orifice, because these polishing methods Technology cannot polish the inner hole of the needle tube and the inner edge of the orifice

Based on the above shortcomings, some relevant manufacturers and other relevant researchers have successively researched and invented other products, such as the patent specification of CN204468881U, which discloses a bottle inserting needle, which is a semi-conical needle. The needle tube, the tip of the semi-conical body should be mechanically rolled and polished to remove the burrs on the tip after it is initially made. Since the apex of the tip is not in the axial center of the needle tube, the tip is not concentric during polishing. Yes, so there will be a problem that the throwing is not in place. In addition, the direction of the tip needs to be controlled when grinding the hole. Since it is a semi-conical body, it will be difficult to accurately locate the direction. If the positioning is not accurate, the grinding out The hole will be biased to the other side, which is not beautiful and difficult to achieve the design effect

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