Separated catheter structure and improved catheter tip and related systems, methods, and devices

摘要

Certain embodiments herein relate to an extension catheter for positioning through a conventional guiding catheter into the vasculature of a patient, the extension catheter having a distal tubular member and a proximal elongated shaft coupled to the distal tubular member, wherein the proximal shaft has a length or section containing at least one discontinuous or segmented structure, and further wherein such structures that can be modified or varied to modify the torsional compliance characteristics of the device. Further embodiments relate to a multi-layer catheter having a protective wrap at or near the distal end of the catheter.