The invention relates to a device for the manufacture by extrusion of a porous tubular support from a ceramic composition, the device including: a fixed extrusion die (6) in which is mounted a punch holder (7) provided with a centered rectilinear punch (8a) and with at least one helically-shaped punch (8) wound around an axis of symmetry (X) along a winding direction and a winding pitch; a system (10) for driving in rotation the punch holder (7) around said axis of symmetry (X) along a direction of rotation opposite to the direction of winding of the punch(es) (8) and at a speed of rotation synchronized with the linear speed of extrusion of the ceramic composition.

A baffle for a membrane device. The membrane device includes a membrane, a feed flow inlet, and a feed flow outlet, such as for water filtration. The baffle includes a proximal end and a distal end, wherein the baffle is operable to extend along at least a portion of the membrane so that the proximal end is toward the feed flow inlet of the membrane device and the distal end is toward the feed outlet of the membrane device. The baffle includes a first geometry portion and a second geometry portion. The first geometry portion includes a higher aspect ratio than the second geometry portion and the first geometry portion is arranged closer to the proximal end of the baffle than the second geometry portion. Also described is a method of producing the baffle and a membrane device containing the baffle.

The general disclosure discusses a system and method for improving the efficacy of blood filtration treatments such as hemodialysis, hemofiltration, and hemodiafiltration. More particularly, the disclosure discusses a microfluidic device that includes first and second channels separated by a permeable membrane. One of the channels is configured for blood flow and includes a protein gel disruption layer. The protein gel disruption layer includes a plurality of elements at least partially extending across the blood flow channel that reduce the formation of a boundary layer or gel layer at the blood-membrane interface.