Abstract: A catheter for cardiac studies which is made of relatively high torque plastic material and which is formed with a pair of straight legs joined by a continuous curve and wherein the said legs are disposed at an angle of 85.degree.. The curve is such that the straight line distance from its midpoint to the intersection of the imaginary inward extensions of said legs is 1/4 the chordal straight line distance between the two points where the said straight legs merge into said curve.