Catheter assembly

A catheter assembly comprising:

• a first elongate tubular member having a proximal end portion defining a proximal end, a distal end portion carrying at least one electrode thereon and having an opening therein and defining a distal end of the first elongate tubular member, and at least one lumen defined between the proximal end and the distal end;
• a second elongate tubular member having a proximal end portion defining a proximal end, a distal end portion carrying at least another electrode thereon and defining a distal end, and at least one lumen defined between the proximal end and the distal end of the second elongate tubular member, the second elongate tubular member being received within the at least one lumen of the first elongate tubular member, such that the distal end portion of the second elongate tubular member carrying the at least another electrode thereon projects from the opening in the distal end portion of the first elongate tubular member;
• and
• an elongate, shape-imparting element receivable in the at least one lumen of the second elongate tubular member, in which the shape-imparting element is axially displaceable relative to the distal end of the first elongate tubular member and the second elongate tubular member, the shape-imparting element imparting a first non-rectilinear shape to the distal end portion of at least one of the first elongate tubular member and the second elongate tubular member,
• wherein the shape-imparting element imparts a second non-rectilinear shape to the distal end portions of both of the first and the second tubular members.