New active principle-containing microparticles, agents containing the same, their use for the ultrasonically controlled release of active principles, and process for preparing the same

摘要

The invention relates to new microparticles containing active ingredients, which contain at least one gas or a gaseous phase in addition to the active ingredient(s), agents containing these particles (microparticulate systems), their use for ultrasound-controlled in vivo release of active ingredients, as well as a process for the production of particles and agents.