Cyclic olefin copolymer chosen for vascular catheter manifold. Boston Scientific (Natick, MA; 800/225-3226) has redesigned its imaging catheter to include Topas 8007, a cyclic olefin copolymer (COC). Topas COC, manufactured by Ticona (Summit, NJ; 908/598-4000), is a medically compatible material that eliminates the need for adhesive, while
reducing material cost and assembly. Unlike polyolefins, urethanes, and nylon copolymers, Topas COC creates a sturdy part without damaging the insert-molded lumen tube, and allows for the consolidation of five nylon elements into a single clear part. The polymer is 92% transparent, flows well at low pressures and temperatures, has a low coefficient of friction, and can undergo E-beam sterilization. The catheter manifold is made in a single-cavity tool. Because Topas COC shrinks less than 0.7% during molding, the part is stable and retains its dimensions while cooling. The manifold has a smooth finish and no rough edges, thereby eliminating secondary finishing.