This disclosure covers polymers, some of which are useful in medical
device applications. The polymers comprise at least two different blocks,
at least one L1 block with the formula ##STR00001## and at least one L2
block with the formula ##STR00002## Medical devices comprising these
polymers, mixtures of these polymers with therapeutic agents, and methods
of making these polymers and mixtures are within the scope of this
disclosure. Some of these medical devices are implantable within a
mammalian body, such as in a body lumen.