Solve problems of drug adherence to metering chamber walls.

The concept of “non-stick” surfaces is well known for kitchen wear products. Coatings such as Teflon® are applied to cooking pots to prevent food adhering to cooking surfaces. Non stick applications, however, extend well beyond frying pans; drug delivery devices for example require dosage metering chambers that will not allow the drug to adhere to its inner walls. This ensures accurate dosage from the first to last dispensation. To make the inner walls of this metering chamber “non-stick”, plasma is used to apply a thin fluorocarbon coating. These coatings readily adhere to a wide range of materials when deposited on the surface using a technique called plasma enhanced chemical vapor deposition (PECVD). PECVD works by activating monomer species, in the plasma and inducing their polymerization on the substrate work-piece. Surface properties of the deposited coating are determined within the first few tens of nanometers of the surface. Gas plasma processing provides a reliable, bio-compatible, and environmentally friendly method of reducing the surface energy of materials by polymerizing fluorocarbons onto a surface in a highly controlled environment.

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RF Plasma?