The raw material polyethylene of the infusion device is […]
The raw material polyethylene of the infusion device is referred to as PE, which is a kind of thermoplastic resin made by polymerization of ethylene. In industry, it also includes copolymers of ethylene and a small amount of α-olefin. Polyethylene is odorless, non-toxic, feels like wax, has excellent low temperature resistance (the minimum use temperature can reach -100~-70°C), has good chemical stability, and can withstand most acids and alkalis (not resistant to oxidation) Nature of acid). It is insoluble in general solvents at room temperature, has low water absorption and excellent electrical insulation.
The raw material polyethylene of the perfusion device has good chemical stability, and can withstand dilute nitric acid, dilute sulfuric acid and any concentration of hydrochloric acid, hydrofluoric acid, phosphoric acid, formic acid, acetic acid, ammonia, amines, hydrogen peroxide, sodium hydroxide, hydrogen at room temperature Potassium oxide and other solutions. But it is not resistant to strong oxidation corrosion, such as fuming sulfuric acid, concentrated nitric acid, chromic acid and sulfuric acid mixture. The above-mentioned solvents will slowly corrode polyethylene at room temperature, while at 90-100°C, concentrated sulfuric acid and concentrated nitric acid will rapidly corrode polyethylene, causing it to be destroyed or decomposed.
Under the action of atmosphere, sunlight and oxygen, polyethylene will age, discolor, crack, become brittle or pulverize, and lose its mechanical properties. At the molding processing temperature, due to oxidation, the melt will be reduced, discoloration and streaks will occur, so attention should be paid to the molding processing and use process or material selection. Because polyethylene has the above characteristics, it is easy to process and shape.
The prefilled syringe is also called the infusion device. It is usually composed of a sleeve, a push rod, a piston, a positioning ring and a protective cap. The product can be used as a medicine package and as a syringe, which not only saves the cost of pharmaceutical manufacturers, but also Improve the efficiency of use.
Infusion devices are mainly divided into two types: with needles and without needles
1. The needle with the injection needle is embedded with the needle, which is composed of a tube sleeve, a needle, a protective cap, a piston and a push rod;
2. There are cone head type and spiral head type without needle. Cone head type is composed of tube sleeve, cone head cap, piston and push rod; spiral head type is composed of glass needle tube, spiral head cap, spiral head, piston And putter.
Filling process of the perfusion device:
Fill the glass needle tube (with a protective cap) with a certain amount of medicine through the filling machine, press or screw in the piston to seal the liquid medicine, and then install a push rod for packaging.
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