Approval for the merlin ptca catheter (otw) and nc merlin ptca catheter (otw).  The merlin ptca catheter (otw) is indicated for use in balloon dilatation of the stenotic portion of a coronary artery or bypass graft stenosis for the purpose of improving myocardial perfusion.  The nc merlin ptca catheter (otw) is indicated for use in balloon dilatation of the stenotic portion of a coronary artery or bypass graft stenosis for the purpose of improving myocardial perfusion, and for the post-delivery expansion of balloon expandable stents.