US Patent 7785304 Sterile sampling methods and apparatus

Apparatus and method for use in the sterile sampling of liquid from a container, the apparatus having a normally vertical tubular sight chamber coupled by its lower end to a sample port assembly. The upper end of the chamber is fitted with an inlet tube through which sample liquid can be received and a filtered vent to allow air to flow to and from the sight chamber while preventing the ingress of bacteria in to the chamber. The sample port assembly has a tubular body encasing a sheathed needle assembly so that evacuated phials can be inserted into the body and pressed onto the needle assembly to withdraw samples of liquid collected in the sight chamber, the sight chamber preferably having transparent walls that are marked with graduations so that each phial can be withdrawn from the needle assembly after the desired amount of liquid has been collected.