Patent ID: 7228164

Claim:
A method for mapping Purkinje fibers in a region of the heart comprising: introducing into the region of the heart to be mapped the distal end of a catheter comprising: an elongated catheter body having a proximal end, a distal end and at least one lumen extending longitudinally therethrough, a mapping assembly mounted at the distal end of the catheter body and comprising at least two spines, each spine having a proximal end attached at the distal end of the catheter body and a free distal end, wherein each spine comprises at least one electrode; and an irrigation tube extending through the catheter body and having an open distal end that is in communication with the outside of the distal end of the catheter body, the irrigation tube having a distal end terminating at the distal end of the catheter body, the irrigation tube being adapted to deliver irrigation fluid to a region between the spines of the mapping assembly; positioning the mapping assembly so that at least one electrode from each spine is in contact with a first plurality of heart tissue; recording electrical data from the first plurality of heart tissue; repositioning the mapping assembly such that at least one electrode from each spine contacts a second different plurality of heart tissue; and recording electrical data from the second plurality of heart tissue.