An osmotic delivery system flow modulator includes an outer shell constructed and arranged for positioning in an opening, an inner core inserted in the outer shell, and a fluid channel having a spiral shape defined between the outer shell and the inner core. The fluid channel is adapted for delivery...http://www.google.com.au/patents/US8158150?utm_source=gb-gplus-sharePatent US8158150 - Two-piece, internal-channel osmotic delivery system flow modulator
