Patent ID: 8313478

Claim:
A catheter assembly for cannulating an ostium of a coronary sinus of a heart, the catheter assembly comprising: an outer catheter member having a proximal end, a distal end portion including a deflectable distal end, and a lumen extending from the proximal end through the deflectable distal end, wherein the distal end portion includes regions of varying stiffness and has a pre-formed curvature; a flexible inner catheter member slidably and rotatably disposed within the lumen of the outer catheter member, the inner catheter member having a proximal end, a distal end portion including a distal end, and a lumen extending from the proximal end through the distal end, the distal end portion having regions of varying stiffness and a pre-formed curvature, the inner catheter member dimensioned such that the distal end of the inner catheter member can extend distally out the distal end of the outer catheter member, an inner handle member including a hemostasis mechanism releasably coupled to the proximal end of the inner catheter member, wherein the outer and inner catheter members are configured such that relative translation and rotation of the outer and inner catheter members causes the distal end of the outer catheter member to assume a plurality of two and three dimensional shapes.