Patent ID: 8007670

Claim:
A cassette comprising: one or more filtrate channel spacers, each of the one or more filtrate channel spacers defining an open interior volume bounded by an inner perimeter and including at least one feed port and at least one filtrate port; one or more non-flexible feed channel spacers, each of the one or more feed channel spacers defining an open interior volume bounded by an inner perimeter and including at least one feed port and at least one filtrate port; one or more membranes disposed between the one or more filtrate channel spacers and the one or more feed channel spacers; a thin film of pressure sensitive adhesive binding together the one or more filtrate channel spacers, the one or more feed channel spacers, and the one or more membranes, said thin film of pressure sensitive adhesive having a thickness of less than 50% of height of an adjacent channel; one or more retaining members at either end of the cassette; and where the one or more filtrate channel spacers and the one or more feed channel spacers are arranged such that the feed ports and the filtrate ports are positioned in respective alignment.