Working head in a catheter for the suction, fragmentation and evacuation of removable material from hollow bodies, in particular thrombi and embolisms of blood vessels, which has at least one lateral opening (14), the catheter (10) presenting a conveyor screw flexible (13) that can be rotated by means of a rotation device (2) of a remote drive unit (1) with respect to the work head (11), the conveyor screw (13) being provided with transport surfaces and a tool cutting, characterized in that the conveyor screw (13) in the area of the work head (11) is designed as the cutting tool that together with the opening (14) in the work head (11) functions as a shear and that during the operation, it continuously crushes the materials or thrombus and embolisms sucked and / or detached that penetrate between the peripheral edges (13a) of the conveyor screw (13) and the edges of the openings (14) and the ev water through the transport surface, and because the lateral opening (14) in the work head (11) is formed as an L-shaped groove (14i, 14k, 14l, 14m) comprising a substantially extending side in the longitudinal direction and a side that extends along a part of the periphery.Cabezal de trabajo en un catéter para la succión, fragmentación y evacuación de material extraíble de cuerpos huecos, en particular trombos y embolias de vasos sanguíneos, el cual presenta al menos una abertura lateral (14), presentando el catéter (10) un tornillo transportador flexible (13) que puede girar por medio de un dispositivo de rotación (2) de una unidad motriz (1) remota respecto al cabezal de trabajo (11), estando provisto el tornillo transportador (13) de superficies de transporte y de una herramienta de corte, caracterizado porque el tornillo transportador (13) en la zona del cabezal de trabajo (11) está diseñado como la herramienta de corte que junto con la abertura (14) en el cabezal de trabajo (11) funciona como una cizalla y que durante la operación tritura de forma continua los materiale
