Patent ID: 8506553

Claim:
A guide catheter assembly comprising: an outer guide catheter including: a flexible elongate shaft having a proximal portion and a distal portion terminating in a distal tip, and a lumen extending through the proximal portion and the distal tip, the distal portion having a preformed shape configured such that the distal portion of the shaft is supported on a wall of the superior vena cava when locating an ostium of the coronary sinus with the distal tip, the preformed shape of the distal portion lying in a single plane and having an overall length from approximately 4.2 to approximately 11.81 inches and including at least: a first arc segment having a first arc radius ranging from approximately 3 to approximately 4 inches; a second arc segment having a second arc radius ranging from approximately 1.2 to approximately 1.8 inches; a third arc segment having a third arc radius ranging from approximately 2.2 to approximately 3.7 inches; and a generally straight terminal portion distal to the third arc segment and having a length of up to approximately 1.81 inches; and an inner catheter slidably and rotatably disposed in the lumen of the outer guide catheter, the inner catheter having a preformed distal end extendable distally beyond the distal tip of the outer guide catheter.