Patent ID: 8083710

Claim:
A system comprising: a recordable signal-bearing medium bearing one or more instructions related to controlling delivery of a material from a delivery device, the one or more instructions including: instructions for generating an acoustic control signal including frequency components absorbable by an acoustically responsive control element of a delivery device in an environment, the delivery device including a fluid-containing structure containing a delivery fluid and a quantity of primary material, the primary material being distributed between a first active form and a second form and having an effective concentration in the delivery fluid equal to the concentration of the first active form in the delivery fluid, wherein the effective concentration of the primary material in the delivery fluid is controllable by the acoustically responsive control element, wherein the instructions for generating the acoustic control signal include instructions for calculating the acoustic control signal based on a model; and instructions for controlling the transmission of the acoustic control signal to the delivery device with signal characteristics sufficient to activate the acoustically responsive control element in the delivery device to control the effective concentration of primary material in the delivery fluid in the delivery device.