Patent ID: 6626170
Filing Date: 2003-09-30
Classification: A61M,B65D,C08L

Abstract:
Apparatus for dispensing medicament, wherein the apparatus is a metering valve for use with a pressurised dispensing container, the valve comprising a valve stem co-axially slidable within a valve member, said valve member and valve stem defining an annular metering chamber, outer and inner annular seals operative between respective outer and inner ends of the valve member and the valve stem to seal the annular metering chamber therebetween, wherein at least a portion of the metering valve has a layer of poly-para-xylylene polymer bonded to at least a portion of one or more internal surfaces of the metering chamber, so as to reduce deposition of medicament on said surfaces, and wherein said one or more internal surfaces are coated with the poly-para-xylylene polymer by vapor deposition polymerization at or near room temperature to form a vapor deposition bonded layer of poly-para-xylylene polymer.