Patent ID: 8571626

Claim:
A medical device, comprising: a catheter body having proximal and distal ends, and defining a longitudinal axis; a distal assembly affixed to the distal end of the catheter body, the distal assembly including at least three flexible arms, each arm having a proximal portion and a distal portion and extending radially outward from a position at or near the longitudinal axis, the distal portions of the arms meeting at a distal tip being located at or near a point along the longitudinal axis; at least three monophasic action potential electrogram recording electrodes, each recording electrode being positioned a radial distance from the longitudinal axis in different radial directions; and at least one reference electrode positioned distal of the distal end of the catheter body, proximal of at least one of the at least three monophasic action potential electrogram recording electrodes, and a longitudinal distance from each recording electrode, wherein the recording electrodes are radially symmetric about the longitudinal axis.