The invention provides sealants wherein biodegradable hydrogels that do not otherwise comprise protein-reactive groups for binding to membranes or tissue are provided said groups optionally through a linker. The linker may be biodegradable and may be biodegradable by an elimination reaction. The invention also provides multilayer gels for drug delivery wherein a porous gel in contact with a tissue or organ to which the drug is to be delivered is protected by a microporous layer from the surrounding bodily fluid.
本发明提供了密封剂,其中提供了不含有蛋白质反应性基团以结合膜或组织的可
生物降解
水凝胶,该基团可以通过连接剂选择性引入。连接剂可以是可
生物降解的,并且可以通过消除反应进行
生物降解。本发明还提供了多层凝胶用于药物传递,其中与要传递药物的组织或器官接触的多孔凝胶被微孔层保护免受周围体液的影响。