Medical plastics have very strict hygienic performance requirements. Generally, fillers are not added to medical plastics, and as far as possible, they may not be added. However, because some medical devices require special functions, certain special fillers are sometimes added to medical plastics.
(1) X-ray opaque filler
Common X-ray opaque fillers include BaSO4, bismuth hypocarbonate, BiO3, bismuth oxychloride, tungsten oxychloride, tantalum oxide, and the like. Common interventional catheters generally need an X-ray opaque line to facilitate the use of X-ray tracking to detect the exact position and positioning of the catheter during surgery.
Colored medical devices are formed by adding pigments or dyes. Generally, the amount of pigment in plastics is less than 1%. The pigments commonly used in medical plastics, such as TiO2, can achieve a uniform, light-proof white color in an amount of 1%. Phthalocyanine blue and phthalocyanine green are the most commonly used organic pigments. These pigments have strong colorability, and 0.1% can produce medium-tone colors.
It is mainly composed of organic composite stabilizers such as Ca, Mg, Zn, and Sn, and supplementary stabilizers such as phosphite and epoxy soybean oil. Its characteristics are:
(2) Prevent the initial coloring and transparency;
(3) Good thermal stability, chemical resistance and oil resistance;
(4) Excellent dispersibility with PVC and plasticizer compatibility.
(1) Lubricants can be divided into three types: external lubricants, internal lubricants, and internal and external lubricants.
PVC has been used as a medical material for many years. It has chemical resistance, strong resistance to oxidants, reducing agents, and strong acids, and is wear-resistant.
As a medical material, PVC must not only meet the requirements of materials science, but also meet the biological requirements:
(1) Additives such as plasticizers and stabilizers are non-toxic and are not easy to seep out of PVC materials;
(2) Good biocompatibility, not teratogenic and carcinogenic, and does not cause allergic reactions;
(3) Good blood compatibility, low hemolysis, and good anticoagulation.
Medical plastics have a wide range of applications in the medical field, such as various medical hoses, blood storage devices, dialysis accessories, surgical gloves, medical conditions, and artificial organs.
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