System for delivery of a biologically active substance into an environment. The container is comprised of a single member or two mated members and defines first and second compartments. The container includes pores in at least a portion of the container defining the first compartment. The first compartment...http://www.google.es/patents/US5876741?utm_source=gb-gplus-sharePatente US5876741 - Chemo-mechanical expansion delivery system
