Patent ID: 8353894

Claim:
A catheter apparatus comprising: a catheter shaft having a first lumen extending therethrough, said first lumen having at least a first inside cross-dimension; a first pair of wires and a second pair of wires; and a core structure, disposed within said first lumen of said catheter shaft, configured to secure the first pair of wires and the second pair of wires between an inside surface of said catheter shaft and an outside surface of said core structure, wherein said core structure includes outside surface portions between locations of the wires having a second cross-dimension that is substantially equal to said first cross dimension of said first lumen for maintaining the core structure in a fixed spatial relationship with respect to the catheter shaft, wherein said core structure includes multiple receptacles formed therein for receiving each of said first and second pairs of wires and wherein said multiple receptacles and each of said first and second pairs of wires extend axially through substantially the entirety of the catheter shaft, wherein said core structure secures said first and second pairs of wires relative to a section of said catheter shaft substantially free of adhesion between said core structure and said catheter shaft at said section, and wherein each wire of said first pair of wires and said second pair of wires are substantially evenly spaced about a periphery of said core structure.