Abstract: An intravascular catheter, such as an angiography catheter, has a tubular body portion formed from a nylon such as nylon-11 which has strength and stiffness characteristics providing excellent torqueability, burst strength, and longitudinal rigidity. A soft tubular tip is fused to the end of the body portion to form a continuous tubular catheter. The soft tip is formed from a blend of the nylon of the body portion with an ester linked polyether-polyamide co-polymer which is soft and rubbery to render the tip soft to avoid injury to a blood vessel.

Abstract: A catheter which is capable of delivering medicine into a blood vessel at a selected point, such as into a coronary artery, includes an outer tube which is joined to the outside diameter of an inner tube by drawing the tubes through a heated die. A distal portion of the outer tube extends beyond the distal end of the inner tube, and the outer tube is formed from a polymeric material having a substantially lower flexural modulus than the polymeric material of the inner tube so that the distal portion is relatively flexible for enabling insertion in a tortuous blood vessel. The inner diameters of the inner tube and the distal portion of the outer tube permit insertion of a guide wire therethrough for aiding in the insertion of the catheter.