Patent ID: 7867761
Filing Date: 2011-01-11
Classification: C12M

Abstract:
1. A tray stack for cultivation of cells in a liquid, comprising: a plurality of trays that are positioned on top of each other when the trays are in a horizontal position, and a first connecting channel, each tray having an opening through which the tray communicates with the first connecting channel, the channel having a gas exchanger having a first internal diameter and comprising at least one processed aperture in a sidewall of the gas exchanger, said processed aperture having a second internal diameter for distribution of gas to the trays, wherein the second internal diameter is in the range from about 0.4 mm to 2.0 mm, and the first internal diameter is greater than the second internal diameter, and when the tray stack is in use, the liquid is in direct contact with gas in the trays.