DIFFUSION BARRIER IN A DELIVERY APPARATUS FOR PRESSURISED MEDICAL LIQUIDS

摘要

A delivery apparatus for pressurised medical liquids comprising a reservoir (1) for medical liquid and a pressurising means (3,10,12) configured for pressurising medical liquid to a driving pressure; with a diffusion barrier (20) arranged to float on medical liquid (2) in the reservoir (1) and disposed to cover substantially the whole surface of the medical liquid (2) in the reservoir (1) for the purpose of preventing diffusion of gas present in the reservoir (1) into the medical liquid (2).