Patent ID: 7968117

Claim:
A method of controlling the release of a plurality of immiscible liquids comprising the steps of: providing one or more microcapsules wherein the one or more microcapsules comprise: the plurality of immiscible liquids; a flexible polymer outer membrane encapsulating the liquids, the polymer outer membrane having a melting temperature; and one or more energy absorbing trigger particles contained in at least one of the liquids in contact with the polymer outer membrane, wherein the one or more energy absorbing trigger particles are co-encapsulated with the liquids by the flexible polymer outer membrane, wherein the one or more energy absorbing trigger particles sediment in the at least one of the liquids in contact with the polymer outer membrane, wherein at least one of the one or more energy absorbing trigger particles are in contact with the polymer outer membrane, wherein the one or more energy absorbing trigger particles have a higher specific absorption rate for radiofrequency, microwave, or ultrasound energy than the specific absorption rate of the polymer outer membrane, and wherein the temperature of the one or more energy absorbing trigger particles is increased by absorbing the energy to melt at least a portion of the polymer outer membrane; delivering the one or more microcapsules in tissue; and applying the radiofrequency, microwave, or ultrasound energy to the one or more microcapsules such that at least one of the one or more energy absorbing trigger particles in at least one of the one or more microcapsules increases in temperature by absorbing the energy thereby melting the respective polymer outer membrane of the at least one of the one or more microcapsules and thereby releasing the encapsulated immiscible liquids.