Patent ID: 7560074

Claim:
An instrument for breaking-up a sample, comprising: a cylindrical body having a through hole opening in both ends thereof; a filter member installed in one end of said cylindrical body within said through hole; and a pressing member to be operatively inserted into said hole of said cylindrical body from the other end thereof so as to be slidable therethrough in a sealed manner, wherein, a centrifugal force is exerted on said pressing member so that said pressing member presses said sample placed between said pressing member and said filter member against said filter member and thereby said sample is forced to pass through said filter member and is thus broken-up, in which said pressing member is provided with a protrusion extending radially on an end surface thereof to face to the sample, wherein said pressing member is able to be pressed while being rotated with respect to said filter member so that said sample is mashed before being forced to pass through said filter member by said force, in which said cylindrical body is provided with a drop-out stop for preventing said filter member from dropping out of said cylindrical body, in the vicinity of the opening located in said one end thereof, said drop-out stop comprising two members extending diametrically so as to cross at right angles to each other.