Patent ID: 8211060
Filing Date: 2012-07-03
Classification: A61K,A61M

Abstract:
1. An implantable device for dispensing an active substance to a patient comprising: a housing having top and bottom portions defining an active substance chamber in fluid communication with an outlet for delivering said active substance to a target site within said patient, and a propellant chamber adjacent said active substance chamber, the top portion including a replenishment opening; and, an undulating flexible membrane separating said active substance and propellant chambers, said undulating flexible membrane having a first position when said active substance chamber is empty and a second position when said active substance chamber contains an active substance, wherein said top portion has an undulating interior surface including a continuously curved central convex portion flanked by at least two continuously curved concave portions and said undulating flexible membrane has a continuously curved central concave portion flanked by at least two continuously curved convex portions in both the first and second positions, said undulating interior surface cooperating with said undulating flexible membrane in the first position, and wherein said replenishment opening is located within said central convex portion of said undulating interior surface so as to lower an overall height of said implantable device, wherein said undulating interior surface of said top portion and said concave and convex portions of said undulating flexible membrane include no flat portions.