Guiding catheter for the right coronary artery

A torqueable guiding catheter adapted to guide a dilatation catheter in a patient's right coronary artery which has an elongated catheter body with an inner lumen having a lubricous coating thereon extending along essentially the entire length of the guiding catheter, the catheter body comprising:

• a) a main, essentially straight tubular section having a proximal end which provides access to the inner lumen therein;
• b) a second tubular section which is distal and adjacent to the main section, which is much shorter than the main tubular section and which is preformed so as to curve away from an extension of the longitudinal axis of the main tubular section;
• c) a third relatively straight tubular section which is distal and adjacent to the second tubular section and which forms an included angle with the extension of the longitudial axis of the main tubular section from 100.degree. to 160.degree. so that the main tubular section and the third tubular section form an obtuse angle;
• d) a fourth tubular section which is distal and adjacent to the third tubular section, which is much shorter than the second tubular section and which is preformed so as to have a smaller radius of curvature than the second tubular section and to curve toward and to have a distal end spaced 3 to 15 cm from the extension of the longitudinal axis of the main tubular section;
• and
• e) at least three perfusion ports in the fourth tubular section having diameter of about 0.03 to about 0.04 inch, with the most distal perfusion port being spaced between 2 cm to 6 cm from the distal end of the fourth tubular section and the individual perfusion ports being spaced 0.1 to about 1 cm from each other.