A modular catheter includes an elongate tubular member (12) having a proximal end (16) and a closed, distal end (14). A lumen (18) extends from the proximal end (16) to the distal end (14) and a plurality of electrodes (20) are arranged at, or adjacent, the distal end (14), conductors (24) for the electrodes being contained within a wall (22) of the tubular member (12). An elongate shape-imparting mechanism (28) is removably received within the lumen (18) of the tubular member (12) such that a distal end (36) of the shape-imparting mechanism (28) is substantially in register with the distal end (14) of the tubular member (12) A control device (40) has a proximal end (46) and a distal end (44), the proximal end (16) of the tubular member (12) and a proximal end of the shape-imparting mechanism (28) being releasably connectable to the distal end (44) of the control device (40).
