Abstract: An assay device configured to separate a suspension into a filtrate and a residue for testing at least one of the filtrate and the residue. The device comprises a filter aperture for a filter membrane for receiving the suspension and separating the suspension into the filtrate and the residue. The device further comprises a filtrate receiving portion; a residue receiving portion; a first buffer container; a liquid release member configured to create an outlet of the first buffer container; a filter arm comprising the filter aperture; and a user actuated switch comprising a transition structure configured to guide the filter arm. During a transition from a first set position to a second set position of the user actuated switch, the filter arm is moved such that the filter aperture is aligned with the residue receiving portion; and the liquid release member and the first buffer container are brought together.

Abstract: The stent matrix of a stent incorporates joints that permit stress-free relative movement of first and second structural portions (10, 12) of the matrix as the facing surfaces of the joint between the structural portions slide relative to one another. The joints are formed in the thickness of an annular wall of the stent, and are created by a computer-controlled laser beam cutting procedure.