Patent ID: 6837995

Claim:
Device for concentrating and/or purifying macromolecules in a liquid by filtration through a membrane comprising (a) a two-sided filtration insert comprising: (i) an upper plate having at least one concentration chamber adapted to receive and contain a liquid containing macromolecules to be processed, each of said at least one concentration chamber being provided with at least one first port that is separate from and in fluid communication with said concentration chamber; (ii) a membrane support plate having at least one filtrate chamber for supporting the permeate side of at least one membrane, said at least one filtrate chamber provided with at least one second port that is separate from and in fluid communication with said filtrate chamber and; (iii) at least one membrane having a feed side and a permeate side, said membrane being fluid-tight along its periphery and situated over at least one of said first and second ports and separating said at least one concentration chamber and said at least one filtrate chamber; and (iv) elastic gasket means arranged around at least one of said first and second ports and in contact with at least one side of said at least one membrane; and (b) a two-part pressure-resistant sleeve with closed end portions, said two-part sleeve being separate from said filtration insert and matingly engaging said upper plate and said membrane support plate of said filtration insert so as to surround said first and second ports, said two-part sleeve being sized so as to exert and maintain sufficient compressive forces to seal said at least one membrane fluid-tight against said concentration chamber and said filtrate chamber wherein said compressive forces arise solely from the engagement of said two-part sleeve with said upper plate and said membrane support plate.