Patent ID: 7958887
Filing Date: 2011-06-14
Classification: A61M

Abstract:
1. A drug delivery device, comprising: a drug container for holding a liquid formulation; and a flexible sheet of material having a nozzle area in fluid connection with the container, the nozzle area having a plurality of pores therein which pores form a population of pores; wherein the pores of the population of pores comprise openings on a first side of the sheet and the openings change in opening size in a manner chosen from (a) a continuous and gradual change from a first edge of the sheet to a second edge of the sheet; and (b) a discrete change of pore sizes from the first edge of the sheets to the second edge of the sheet; wherein the change in pore size in the population provides a negative gradient, wherein the pore sizes decrease in a direction of airflow.