Abstract: Gas is generated at a controlled rate from a liquid and solid phase combination that generated gas upon contact, by using diffusive transport of the liquid toward the solid phase surface to prolong the rate of gas generation, with a variety of alternatives for controlling the rate of diffusive transport. This system is useful in infusion devices for delivering medications or other beneficial liquids from a retaining pouch at controlled rates over a prolonged period of time.

Abstract: A polymeric casing with a textured (matte-finish) surface is manufactured by dipping a form having external contours conforming to the desired shape of the casing in a solution of a polymer dissolved in one liquid, withdrawing the form from the solution to retain the solution as a film over the form's outer surface, applying a second liquid over the surface of the film, the second liquid being one which is miscible with the first and in which the polymer is insoluble, then solidifying the polymer into a solid film, preferably by solvent evaporation. Application of the second liquid prior to complete drying of the polymer film causes the resulting film to have a matte finish, which has a lubricous effect without the need for added lubricant powders or liquids, particularly when combined with a mandrel which imparts a similar surface finish to the interior of the film.

Abstract: Thin-walled, high-strength prophylactic sheaths fabricated from elastomeric polymer materials are augmented along the border at the open end with a resilient material having a 100% tensile modulus substantially lower, preferably lower by at least about 75%, than that of the sheath material. This facilitates the rolling of the edge and stretching of the sheaths for purposes of application without compromising the high degree of sensitivity in terms of heat and sensation transmission associated with the thin-walled sheaths themselves.