Rotor or carrier for centrifugal analyzer and bead washer

Claim 1

A bead holder comprising a disc-like member having a central opening and having on its top surface a plurality of wells, each said well being defined by an outer peripheral wall, an inner wall, a bottom wall and a pair of side walls, each said well having a pair of spaced barriers collectively attached to the peripheral wall, bottom wall and two side walls and defining a channel therebetween, each said well also having an outlet aperture through its peripheral wall which communicates with an upper part of the well whereby liquid is maintainable in the wells and removable from the wells by centrifugal force, each spaced barrier projecting radially inward from the peripheral wall and projecting out from one side wall and towards another side wall, said channel having communication at one end with the bottom wall of said well and at the other end with said outlet aperture; a spherical bead for each well, each of said spherical beads sized to be received in said wells and retained therein by said spaced barriers during rotation of the bead holder, and wherein each well is completely open-topped between its inner wall, side walls, and peripheral wall.