Torquable catheter

In a torquable catheter for performing ablation procedures in the heart, a flexible elongate tubular member having proximal and distal extremities and having a longitudinal axis, said tubular member having first and second portions each having proximal and distal extremities, said first portion having its proximal extremity adjacent the proximal extremity of the tubular member and being comprised of a plastic torque tube having a cylindrical wall which is circular in cross-section and having fibers disposed therein counterwrapped in two different spirals to provide good torque characteristics, said second portion adjacent to the distal extremity of the flexible elongate tubular member and being comprised of a metal torque tube having at least one slot therein subtending less than 360.degree. and extending substantially transversely of the longitudinal axis, a flexible sleeve encasing said metal torque tube, means forming a joint between the proximal extremity of said metal torque tube and the distal extremity of said plastic torque tube and means mounted on the proximal extremity of the flexible elongate member for causing bending and connected to the distal extremity of the tubular member of the second portion of the tubular member.