Composite catheter with single axial sensors and ring electrodes and related methods

An electrophysiology catheter, comprising:

• an elongated support member with shape-memory, defining a longitudinal axis of the catheter, the support member including a distal portion configured with a generally circular portion generally transverse to the longitudinal axis, and an elbow portion proximal of the generally circular portion, the elbow portion having an inside surface facing inwardly of the generally circular portion;
• a single-axis sensor situated on the generally circular portion, the sensor including a coil, a first wire and a second wire, the coil wound on the elongated support member, the coil having a distal end and a proximal end, the first wire having a distal end and a proximal portion, the second wire having a distal end and a proximal portion, the distal end of the first wire connected to the proximal end of the coil, the distal end of the second wire connected to the distal end of the coil, the first and second wires extending from the coil extend along the inside surface of the elbow portion;
• an elongated outer tubing generally coextensive with the support member, the tubing including a side wall surrounding a lumen through which the support member extends, the tubing including a conductive wire embedded in the side wall and a ring electrode on an outer surface of the side wall;
• and
• an insulating sheath circumferentially surrounding at least the first and second wires, the insulating sheath having a distal end terminating proximal of the elbow portion such that the first and second wires are fanned out along the inside surface of the elbow portion distal of the distal end of the insulating sheath.