Catheter with single axial sensors

A catheter comprising:

• an elongated body;
• a distal member distal of the elongated body, the distal member having a support member and a configuration;
• a control handle proximal of the elongated body;
• a magnetic-based sensor assembly including at least one conducting member comprising a wire having first and second ends, the wire comprising:
• a coil region that is wrapped on the support member;
• and
• a joint region associated with and adjacent the coil region, the joint region comprising:
• a first connection of the first end of the wire to a cable member at a first location proximal of the associated coil region, and
• a second connection of the second end of the wire to the cable member at a second location proximal of the associated coil region,
• a first strain relief construction comprising a first plurality of windings of the cable member around the support member, and
• a second strain relief construction comprising a second plurality of windings of the cable member around the support member, the second plurality of windings of the cable member being spaced from the first plurality of windings of the cable member;
• a third strain relief construction comprising a third plurality of windings of the cable member around the support member, the third plurality of windings of the cable member being spaced from the first and second pluralities of windings of the cable member;
• the cable member being adapted to transmit a signal providing location information from the conducting member to a mapping and localization system, and the joint region provides strain relief to the associated coil region and the cable member from detaching.