A modular catheter comprises a tubular sheath module having one or more electrodes attached to the distal end of the tubular sheath and an elongate shape imparting mechanism module. The shape imparting mechanism module is removably received within a lumen defined by the tubular member. The tubular sheath module and the shape imparting mechanism module are releasably connectable to a handle module. The handle comprises a plurality of wall members defining a cavity housing one or more modules releasably connected to the handle and accessible by at least partially separating the wall members. The tubular sheath, the shape imparting mechanism module and the handle are replaceable independently and can be sterilised for subsequent use.
