Patent ID: 8529551
Filing Date: 2013-09-10
Classification: A61M

Abstract:
1. A delivery device comprising: a. a delivery reservoir configured to contain a delivery fluid, the delivery reservoir having at least one outlet through which the delivery fluid may exit the delivery reservoir; b. a delivery fluid contained within the delivery reservoir; c. a primary material contained within the delivery reservoir and having a controllable effective concentration in the delivery fluid; and d. at least one acoustically responsive shape-changing structure capable of changing in at least one dimension in response to an acoustic control signal, the change in at least one dimension of the shape-changing structure modifying the distribution of the primary material between a first active form carried in the delivery fluid and a second form, and the effective concentration being the concentration of the first active form in the delivery fluid, wherein the shape-changing structure is an expanding or contracting structure, wherein the change in at least one dimension includes an expansion or contraction in at least one dimension, wherein expansion or contraction of the expanding or contracting structure exposes molecular structures to the delivery fluid that modify the solubility of the primary material in the delivery fluid, wherein the molecular structures are interaction sites for the primary material, whereby primary material bound by the interaction sites is removed from the delivery fluid.