Guiding sheath system and method of delivering an endovascular device using the same

A method of delivering an endovascular device within the vasculature of a patient, comprising:

• providing a guiding sheath system including
• a first sheath having a proximal end and a distal end,
• an extension member connected to the distal end of the first sheath, the extension member terminating in a distal end,
• a second sheath extending through the first sheath, the second sheath having a proximal end and a distal end, and
• a cap connected to the distal end of the extension member and the distal end of the second sheath;
• inserting the guiding sheath system within the vasculature of a patient such that the cap is at a predetermined location within the vasculature;
• advancing the second sheath through the first sheath such that the cap restrains the distal end of the second sheath and the cap deflects relative to the first sheath thereby causing a portion of the second sheath protruding from the first sheath to bend into a curve with the distal end of the second sheath at a vector different from a vector of the first sheath;
• and
• advancing an endovascular device through the second sheath to a position forward of the distal end of the second sheath along the vector of the distal end of the second sheath.