A medical closure screen device for a separation of first and second tissue portions is provided, which includes a mesh screen comprising tubular vertical risers, vertical strands with barbed filaments, and horizontal spacers connecting the risers and strands in a grid-like configuration. An optional perimeter member partly surrounds the screen and can comprise a perimeter tube fluidically coupled with the vertical risers to form a tubing assembly. Various input/output devices can optionally be connected to the perimeter tube ends for irrigating and/or draining the separation according to methodologies of the present invention. Separation closure, irrigation and drainage methodologies are disclosed utilizing various combinations of closure screens, tubing, sutures, fluid transfer elements and gradient force sources. The use of mechanical forces associated with barbed strands for repositionably securing separated tissues together is disclosed. The use of same for eliminating or reducing the formation of subcutaneous voids or pockets, which can potentially form hematoma and seroma effects, is also disclosed. The device can be fabricated and the method practiced with clips having various configurations.Linvention concerne un dispositif médical à grille de fermeture pour séparer une première et deuxième parties dun tissu, comprenant une grille maillée comprenant des montants verticaux tubulaires, des fils verticaux dotés de filaments barbelés, et des espaceurs horizontaux reliant les montants et les fils dans une configuration de type grille. Un élément périmétrique optionnel entoure partiellement la grille et peut comprendre un tube périmétrique couplé en communication de fluide avec les montants verticaux pour former un ensemble de tubes. Divers dispositifs dentrée/sortie peuvent éventuellement être reliés aux extrémités du tube périmétrique pour irriguer et/ou drainer la séparation selon des méthodologies de la présente invention. Linvention concerne des méthodologie
