COTTON WOOL (gossypium) — the dressing material consisting of weight connected among themselves vegetable or synfils.
In medical practice apply hygroscopic and compresseal Century.
Century hygroscopic prepare from one cotton or cotton with addition of viscose staple fiber. For V.'s giving hygroscopic properties cotton is boiled in caustic solution that leads to removal of the zhirovoskovy and pectic substances interfering wetting of fiber and water intrusion in his cavity.
Hygroscopic V.'s quality is estimated (in accordance with GOST) a number of indicators, napr, an absorbing capacity (the amount of water in grams absorbed by 1 g of theoretically dry V.), a capillarity, a contamination, content of the dense not combed accumulations (small knots), zhirovoskovy substances, chlorides, sulfates, etc.
Depending on appointment three types of hygroscopic V.
1 are (in accordance with GOST) developed. Eye — from cotton-fiber I of a grade. An absorbing capacity — not less than 21 g. A capillarity — not less than 75 mm.
2. Surgical — from cotton-fiber III of a grade — 90 — 100% or 60 — 70% with inclusion of viscose rayon I of a grade no more than 30%. Addition of combed waste (fiber, heterogeneous on length) — no more than 10% is allowed. An absorbing capacity — not less than 20 g. A capillarity — not less than 70 mm. Is one of the base dressing materials.
3. Hygienic — from cotton-fiber V of a grade — 75% and lint of a cotton I grade — no more than 25%. An absorbing capacity — not less than 19 g. A capillarity — not less than 65 mm. This V. is used for hygienic female bandages, etc.
Use also various substitutes of hygroscopic V., e.g. V. from 100% of viscose staple fiber (has the absorbing ability, a little smaller in comparison with cotton V.); Century from synfils (the thermorack has the insufficient absorbing ability and not always); the fluffed-up wood pulp (has the satisfactory absorbing ability, but consists of the short, not connected among themselves fibers that limits a possibility of use it as a dressing material). Expanded plastics (e.g., on the basis of polyvinyl chloride pitch, etc.) which well absorb wound exudate are perspective as hygroscopic V.'s substitute and have steady structure.
Century compresseal prepare from V—VI cotton-fiber of a grade with addition of cotton lint. Fiber shall be well combed, elastic (elasticity of 72%), not falling down in lumps. Apply as the warming material in the warming compresses and as soft laying during the imposing of tires and retaining bandages.
See also Dressing material .
Bibliography: Weinstein G. A. Reference book on wadded production, M., 1972, bibliogr.
3. V. Mikirticheva.