Abstract: A rotor is provided for the centrifugal separation of a composite fluid, such as animal or human blood, into components. An inner surface of the rotor includes at least one hydrophobic area having a first surface energy sufficiently low to provide a flow path for a lower density fluid component to flow to the bottom of a central collection chamber after centrifugal separation. A method of separating a composite fluid into components using such a rotor is also provided. Additionally, a method of manufacturing such a rotor is provided.

Abstract: A centrifugal device and method are provided for the separation of buoyant material such as parasitic ova from fecal matter. A rotor assembly, rotatable about its central axis in a centrifuge, includes a housing with a centrally located top opening leading to a centrally located mixing chamber. An annular sediment chamber is provided, also coaxial about the central axis, connected by a passage with the mixing chamber. A coring assembly is used to retrieve and insert a fecal sample into the mixing chamber for mixing with a flotation fluid. During centrifugation, heavier fecal components pass radially outwardly to the sediment chamber while the ova collect on the inward surface of the flotation fluid. After centrifugation, more flotation fluid is added, if needed, until a meniscus forms at the top opening. A coverslip is placed over the top opening and the ova float to the surface of the fluid and adhere to the coverslip. The coverslip is removed and the ova detected using standard microscopy procedures.