Patent ID: 6970730

Claim:
A catheter comprising: an elongated catheter body having proximal and distal ends and at least one lumen therethrough; an electrode assembly at the distal end of the catheter body, the assembly having proximal and distal ends and comprising a plurality of spines, the spines comprising a plurality of electrodes; an expander forming a longitudinal axis of the assembly, the spines attached at their distal ends to the expander, wherein the assembly has an expanded arrangement when the expander is moved proximally along the longitudinal axis relative to the catheter body and the assembly has a collapsed arrangement when the expander is moved distally along the longitudinal axis relative to the catheter body; and a distal electrode location sensor mounted at or near the position where the distal ends of the spines are connected, and a proximal electrode location sensor mounted at or near the proximal end of the electrode assembly, whereby, in use, the coordinates of the distal electrode location sensor relative to those of the proximal electrode location sensor can be determined and taken together with known information pertaining to the curvature of the spines of the assembly to find the positions of each of the plurality of electrodes on the spines.