Provided is a medical material useful for wound dressings or a drug delivery system, which material is safe and has high healing effects, more specifically, which is free from cytotoxicity or other side effects caused by a drug and permits the selective healing of the diseased site in a small dosage without damaging the sites other than the diseased site.
The medical material so provided is a polymer gel having a sequence represented by the formula: A-Sp1-E-Sp2-G wherein A represents a water-swelling polymer gel, Sp1 represents the first spacer, E represents a cleavable group with the main chain to be cleaved via an enzymatic reaction, Sp2 represents the second spacer and G represents a drug. When the polymer gel is used, the cleavable group (E) is cleaved according to an amount of an enzyme existing at the diseased site to release the drug in accordance with the amount of the enzyme.
本发明提供了一种可用于伤口敷料或给药系统的医用材料,该材料安全且愈合效果好,更具体地说,该材料没有细胞毒性或其他由药物引起的副作用,并能以小剂量选择性地愈合病变部位,而不损伤病变部位以外的其他部位。
所提供的医用材料是一种聚合物凝胶,其序列由式表示:A-Sp1-E-Sp2-G,其中 A 代表
水膨胀聚合物凝胶,Sp1 代表第一间隔物,E 代表可裂解基团,主链可通过酶反应裂解,Sp2 代表第二间隔物,G 代表药物。使用聚合物凝胶时,可裂解基团(E)会根据病变部位酶的含量被裂解,从而根据酶的含量释放药物。