A prosthesis for insertion into a body passage is disclosed. The prosthesis includes
a plastic or polymer base material which is compatible with living tissue and which
possesses a memory of a predetermined configuration. The base material further
has a glass transition temperature at which the prosthesis can be molded intravascularly
from the predetermined configuration to a larger-radius implant configuration,
which is sized and shaped to conform to an internal anatomy of the body passage
to expand a narrow segment of or to occlude an opening of an out pouch of the body
passage. The glass transition temperature is greater than a temperature of the
body passage so that the prosthesis after being molded can be allowed to cool to
the temperature of the body passage.