According to an aspect of the present invention, implantable or insertable
medical devices are provided, which contain one or more polymeric
regions, which in turn contain at least one block copolymer. The block
copolymer includes (a) at least one high T.sub.g (glass transition
temperature) polymer block that contains at least one high T.sub.g vinyl
ether monomer and (b) at least one low T.sub.g polymer block that
contains at least one low T.sub.g vinyl ether monomer.