A closure assembly (10) for use in a trocar assembly, comprising: a closure body (12) having proximal and distal ends with a longitudinal axis extending therethrough and a transverse plane substantially perpendicular to the longitudinal axis ； and two opposing closure elements (16, 18) that extend distally at an acute angle to the transverse plane from the proximal end of the closure body, the closure elements having opposite interior and exterior surfaces and meeting on one side from the individual closure (30) to the distal end of the closure body, the closure elements being configured to selectively open and close the closure face substantially, characterized in that the inner surfaces of the closure elements are configured to selectively promote fluid movement of a central part (20) of the closure elements towards a peripheral portion (22) of the closure elements on the closure face, and wherein the central portion (20) of each of the interior surfaces of the elements of closure is in a position more proximal than the peripheral part (22) of the closure elements in the closure face.Un conjunto de cierre (10) para uso en un conjunto de trocar, que comprende: un cuerpo de cierre (12) que tiene extremos proximal y distal con un eje longitudinal que se extiende a su través y un plano transversal sustancialmente perpendicular al eje longitudinal； y dos elementos de cierre opuestos (16, 18) que se extienden en sentido distal en un ángulo agudo con respecto al plano transversal desde el extremo proximal del cuerpo de cierre, teniendo los elementos de cierre opuestos superficies interior y exterior y reuniéndose en una cara del cierre individual (30) al extremo distal del cuerpo de cierre, estando configurados los elementos de cierre para abrir y cerrar selectivamente sustancialmente la cara de cierre, caracterizándose porque las superficies interiores de los elementos de cierre están configuradas para promover selectivamente el movimiento de fluido de una parte central
