Abstract: The present invention relates to an improved intravascular catheter. One improvement relates to the catheter body wherein the body is made of an inner tube of high temperature thermoplastic having a low coefficient of friction (for example fluorinated polymer). The extruded inner tube carries on its periphery a plurality of gear bodies. Each gear body further includes opposing elongated tangentially extending gear teeth spaced above the periphery of the tube. Wires are wound about the tube and over the gear teeth. An overcoat of low temperature thermoplastic covers the entire catheter and is interstitially disposed beneath the tangential teeth and the gear supported portions of the wire.The overcoat of low temperature thermoplastic over the high temperature fluorinated polymer produces an interlocking gear thereby enhancing the lamination of both low and high temperature polymers. This coupled gear design makes possible a mechanical anchoring to fluorinated polymers such as TEFLON.RTM.