Biocompatible, hydrophilic material, method of manufacture and uses of same
AssigneesLa Cellulose Du Pin, Universite de Bordeaux II
InventorsJean-Claude Pommier, Joel Poustis, Charles Baquey, Dominique Chauveaux
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Abstract
A biocompatible hydrophilic material is based on purified cellulose, from which material all or the majority of the water has been removed and which has a modulable potential for water recovery of up to an amount of water of approximately 60%. The material can be used for the production of fitting sheaths for articulated prostheses.
Claims11
A method for the manufacture of a biocompatible hydrophilic material based on purified cellulose, from which material the majority of the water has been removed by drying, and which has a modulable potential for water recovery of up to an amount of water of approximately 60%, comprising the following steps:
- a. preparing alkali-cellulose by steeping cellulose pulp using bisulfite acid in a sodium hydroxide solution followed by drying and pressing to achieve a weight of dry cellulose of between 30 and 40%,
- b. then sulfurating the alkali-cellulose using carbon sulfide at least in stoichiometric quantities, in order to obtain sodium xanthate,
- c. dissolving the sodium xanthate in a diluted sodium hydroxide solution to obtain a viscose solution containing cellulose and sodium hydroxide in well-determined proportions,
- d. submitting the viscose obtained to heat treatment so as to provoke the coagulation of the viscose and to treatment for removal of the sulfur, so as to obtain an amorphous material with rubber-like characteristics,
- e. and drying the material obtained.
Dependencies are inferred from the claim text.