A device suitable for use in a body lumen (5) and comprising: - an elongated control member having a distal and a proximal end, and a radially expandable member (3) disposed at or near the distal end, - having the radially expandable member (3) a proximal end (2B) and a distal end (1B) and being adjustable between a contracted orientation and an expanded orientation adapted to cut matter from a body lumen wall (5), - the member comprising elongate control a proximal arm (2) operatively connected to the radially expandable member (3) and a distal arm (1) operatively connected to the radially expandable member (3) distally of the proximal arm connection so that the movement of an arm in relation to the other arm, it adjusts the diameter and / or radial resistance of the radially expandable member (3), - a control mechanism operatively connected to both arms (1, 2) and adapted to provide resistance to movement of one arm relative to the other, in which the control mechanism comprises a first part (2A) connected to one of the arms, a second part (1A) connected to the other of the arms, which is movable in relation to the first part, and resistance means (4, 6) controlled in force to resist the movement of the first part (2A) in relation to the second part (2B), characterized in that the resistance means controlled in force comprises (a) elastic loading means (6) for elastically loading the radially expandable member (3) to the expanded orientation and / or (b) braking means (4) adapted to resist the movement of one of the first and first parts second (2A, 1A) in relation to the other of the first and second parts (2A, 1A), in which the braking means (4) are adjustable so that the level of resistance to movement can be adjusted.Un dispositivo adecuado para su uso en un lumen corporal (5) y que comprende: - un miembro de control alargado que tiene un extremo distal y uno proximal, y un miembro radialmente expandible (3) dispuesto en o cerca del extremo distal, - teniendo
