| http://www.w3.org/ns/prov#value | - This invention also discloses a medical tool, wherein a water-swellable polymer containing in the molecular unit thereof at least one reactive functional group such as hydroxyl group, amino group, or epoxy group which is capable of reacting with an acid anhydride is applied in the form of a coating to the surface of a matric material containing an acid anhydride group in the molecular unit thereof
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