Patent ID: 7863408

Claim:
A body fluid compatible and biocompatible resin for use in a medical treatment involving a contact of said resin with at least one member selected from the group consisting of a body fluid and a biological tissue, which comprises a random copolymer that is represented by the following formula (4): wherein: each R 12 independently represents a â€”CH 2 COOH group, a â€”CH 2 COONa group or a â€”CH 2 COOR 13 group, wherein each R 13 represents a group comprising an amino acid or peptide having chemically bonded thereto a compound having a pharmaceutical activity; m and n are integers, said random copolymer having a weight average molecular weight in the range of from 27,000 to 65,000, as determined by GPC using a calibration curve obtained with respect to standard polyethylene glycol (PEG) samples, each having a narrow molecular weight distribution.