An ablation catheter comprising: a catheter having a longitudinal axis and further having a proximal end and a distal end, the catheter comprising: an outer catheter tube; an inner catheter tube slidably disposed within the outer catheter tube, said inner catheter tube having a distal end adapted for insertion into a vessel of the body; and a floating tube slidably disposed relative to the inner catheter tube, said floating tube disposed at least partially within the distal end of the inner catheter tube; and an electrode array disposed on the distal end of the catheter, fixed to the inner catheter tube and restrained within a distal portion of the outer catheter tube, said electrode array comprising a plurality of resilient arms, each arm having a proximal arm segment and a distal arm segment resiliently or rotatably joined to each other at a bend point, the distal arm segments fixed to the floating tube, and whereby the electrode array may be retained in a small diameter configuration within the catheter and released to assume a large diameter configuration, wherein the large diameter configuration comprises the proximal arm segments bent radially outwardly from the catheter with the distal arm segments extending radially inwardly from the proximal arm segments; characterised in that in the large diameter configuration the distal arm segments are expanded and flattened to create a substantially planar arrangement when the catheter is pushed in a distal direction to contact an area of tissue to be ablated; and at least one electrode disposed on each of the distal arm segments of the array such that, in the large diameter configuration, the distal arm segments and the electrodes are in a substantially planar arrangement, and wherein the distal arm segments tend proximally from the bend point in the large diameter configuration and tend distally from the bend point in the small diameter configuration, or wherein, in the small diameter configuration, the distal arm segments are folded inwardly so as to be disposed proximate the proximal arm segments and extend proximally from the bend point. a catheter having a longitudinal axis and further having a proximal end and a distal end, the catheter comprising: an outer catheter tube; an inner catheter tube slidably disposed within the outer catheter tube, said inner catheter tube having a distal end adapted for insertion into a vessel of the body; and a floating tube slidably disposed relative to the inner catheter tube, said floating tube disposed at least partially within the distal end of the inner catheter tube; and an outer catheter tube; an inner catheter tube slidably disposed within the outer catheter tube, said inner catheter tube having a distal end adapted for insertion into a vessel of the body; and a floating tube slidably disposed relative to the inner catheter tube, said floating tube disposed at least partially within the distal end of the inner catheter tube; and an electrode array disposed on the distal end of the catheter, fixed to the inner catheter tube and restrained within a distal portion of the outer catheter tube, said electrode array comprising a plurality of resilient arms, each arm having a proximal arm segment and a distal arm segment resiliently or rotatably joined to each other at a bend point, the distal arm segments fixed to the floating tube, and whereby the electrode array may be retained in a small diameter configuration within the catheter and released to assume a large diameter configuration, wherein the large diameter configuration comprises the proximal arm segments bent radially outwardly from the catheter with the distal arm segments extending radially inwardly from the proximal arm segments; characterised in that in the large diameter configuration the distal arm segments are expanded and flattened to create a substantially planar arrangement when the catheter is pushed in a distal direction to contact an area of tissue to be ablated; and at least one electrode disposed on each of the distal arm segments of the array such that, in the large diameter configuration, the distal arm segments and the electrodes are in a substantially planar arrangement, and wherein the distal arm segments tend proximally from the bend point in the large diameter configuration and tend distally from the bend point in the small diameter configuration, or wherein, in the small diameter configuration, the distal arm segments are folded inwardly so as to be disposed proximate the proximal arm segments and extend proximally from the bend point.