Hollow filament blood processing apparatus

A hollow filament blood processing apparatus comprising a housing having opposite open ends, a bundle of multiple hollow filaments for processing blood, the hollow filament bundle being located in the housing,

• an inlet and an outlet disposed in the housing near the opposite ends for passing a blood-processing fluid through the housing,
• partitions fixedly securing the hollow filament bundle at opposite ends to the opposite of the housing, and
• caps fixedly attached to the opposite ends of the housing to face the respective partitions and each having a port for passing blood from one port to the other port through the hollow filaments,
• each of said caps having received therein a respective elastomeric annular gasket which is deformable under pressure, each annular gasket including an inside elastomeric ring, an outside elastomeric ring, and an elastomeric annular bridge connecting said inside and outside elastomeric rings, said inside elastomeric ring, said outside elastomeric ring and said annular bridge defining and annular space with a respective partition, each inside elastomeric ring interposed between the respective cap and one of the partitions, said outside elastomeric ring being interposed between the respective cap and the housing.