Continuous cell culture system

Claim 1

In the method of continuous cell culture comprising growing cells in an agitated liquid suspension of nutrient culture medium containing known amino acids, mineral salts, vitamins and carbohydrates and periodically removing filtered liquid from the cells, the improvement comprising carrying out the agitation and filtering in apparatus comprising a hollow flask having an opening at the top, an elongated hollow shaft means and a stationary sleeve assembly positioned within said flask, said elongated hollow shaft means journaled for axial rotation in said stationary sleeve assembly, in fluid communication with said top opening of said flask and supported downwardly therefrom without any lower bearing, and a filter unit supported downwardly from said elongated hollow shaft means without any lower bearing and without any moving seals between the filter unit and any filter support means which could contact the cell suspension and adapted for coaxial rotation with said elongated hollow shaft means, said filter having a fluid collection cavity in direct fluid communication with the interior of said shaft means and the top opening of said flask, and a porous peripheral surface having a pore size smaller than the cells to be cultured or the carrier particles upon which said cells are attached but sufficiently large to permit permeation of fluid into said fluid collection cavity.