Apparatus for growing tissue cultures in vitro

A device for growing cells or tissues for use with a well having a well housing having at least one side wall and a well bottom defining a well chamber for receiving media, comprising:

• a housing having a wall, a top end, a bottom end, and a flange, said bottom end having a permeable membrane, said permeable membrane having a top surface and a bottom surface, said top surface for receiving one or more cells for culture, and said bottom surface for positioning in a juxtaposed spaced relationship to said well bottom to allow said cells to receive media held in said well through said permeable membrane, said wall capable of being received within said well chamber, in spaced relationship with said side walls of said well to define an annular space which annular space does not allow capillary action with aqueous fluid, and said flange extending radially from the top end of said wall and capable of being received on said well housing to suspend said wall within said well chamber, said flange having a rim capable of being received by said side wall to preclude lateral movement of said housing in said well chamber for positioning said wall in said well chamber to maintain said annular space, and said spaced relationship between said well bottom and said bottom surface of said permeable membrane.