| 摘要 |
The invention relates to surgical tubular devices, such as catheters, tracheal or gastric intubation or sounding tubes, tubes for removal of tracheal or pulmonary secretions, and cyctoscopes designed to be temporarily introduced into cavities of living body and consisting of entirely or partially of a hydrophilic copolymer of acrylonitrile with either acrylamide or acrylic acid and, if desired, with a small amount of other co-monomers. The copolymers are swellable in water and aqueous solutions. In the swelled condition they are pliable, elastic and strong. Their properties can be changed by changing the degree of hydrolysis, if the copolymer was prepared by partial hydrolysis of polyacrylonitrile, or by changing the content of hydrophilic units, if the copolymer was obtained by copolymerization of a monomer mixture. |
