Abstract: An absorbing dressing for wounds consists of spherical particles of regenerated cellulose of the size 0.05-0.5 mm and a macroporous structure characterized by the cyclohexane regain of the dry material at least 0.2 ml/g. The dressing is prepared from the regenerated cellulose swollen with water by replacement with organic solvents and the subsequent drying of the product swollen with the said solvent and impregnated with a therapeutically active compound.
Type:
Grant
Filed:
April 12, 1984
Date of Patent:
October 7, 1986
Assignees:
Ceskoslovenska akademie ved of Prague, Akademie der Wissenschaften der DDR
Inventors:
Frith Loth, Horst Dautzenberg, Jiri Stamberg, Jan Peska, Dieter Bertram, Herbert Lettau
Abstract: Graft copolymers are formed having a backbone formed by monomeric units, selected from the group of vinyl monomers comprising acrylates, methacrylates, acrylamide, styrene and N-vinyl-2-phyrrolidone, and side branches formed by 10-80 wt. % of oligourethanes based on aliphatic, aromatic and alkylaromatic diisocyanates and low-molecular-weight diols with 2-4 carbon atoms in the molecule. The graft copolymers are prepared in two steps: the first step consists in the synthesis of oligourethane with the terminal unsaturated group; the second step is the radical copolymerization of this oligourethane with the above vinyl monomers.
Type:
Grant
Filed:
October 18, 1984
Date of Patent:
April 22, 1986
Assignee:
Ceskoslovenska Akademie Ved of Prague
Inventors:
Slavko Hudecek, Ivana Hudeckova, Pavel Cefelin