A delivery device suitable for delivering a chemical substance, e.g. a medical device such as a catheter, a microcapsule, an implantable capsule or a P-ring, or a delivery device for use in the construction industries e.g. in the form of microcapsules comprising antifouling agent for marine paint. The delivery device includes a closed cavity, the cavity is defined by an innermost wall surface, wherein at least a section of the inner wall surface constitutes an inner surface of a delivery membrane wherein the delivery membrane includes an interpenetrating polymer network substrate comprising a host polymer and a guest polymer, where the guest polymer is interpenetrating the host polymer to form substantially continuous pathways within said host polymer.

Hygienic Hydrophilic coatings, hydrophilic coating formulations and wetting fluids that include an anti-infective agent.

Lubricious hydrophilic coatings having a first visual appearance when in a non-hydrated state and transitioning to a second visual appearance when in a hydrated state and methods of making the same.