Abstract: The invention concerns a sieve (2) for bio-impactor (1), characterized in that it comprises air passages (6) from upstream (M) towards downstream (V) of the sieve (2), the passages (6) having a gradually tapering cross-section from an inlet (11) towards an outlet (12). Preferably, the inlets (11) are mutually connected forming a sharp edge (13) over their entire periphery, and the outlets (12) are circular. In a preferred embodiment, the inlets (11) are hexagonal, and the passages (6) have a cylindrical end (16) proximate the outlet (12) surrounded by a thin material thickness. Such a sieve is particular adapted to receive large particles, such as moulds and yeasts in a culture medium (4) supported by the bio-impactor (1).

Abstract: Device and method for diffusing a protective flux. In order to protect one area of a service station, a more or less parallel air flow is created in the direction of the area. Above a threshold F, the air flow has a gradually increasing speed V22 and, below the threshold, the air flow speed V21 is more or less uniform along the length of a flow section in a plane P which is transverse to the direction of flow D. One possible configuration for an air flow diffusion device, which allows a confinement barrier to be created, consists of a diffusing wall comprising a main wall and a lateral wall. The main planar wall is adapted to diffuse a main laminar flow in the sterile area to be protected. The lateral wall is adapted to diffuse a lateral flow divergent from the main flow. A skirt is disposed to create an obstacle to the lateral flow and to accelerate the flow by of deflection.