The present invention provides a deflectable catheter whose puller member connections are accomplished with minimal, if any, surface deformation which could otherwise accelerate breakage under tension. The substrate has a window from the first face to the second face that exposes chip pads of a semiconductor chip adherable to the first face. The first member is pivotable about the longitudinal axis with respect to the second member and includes a load ring engagement surface defining a seal cavity disposed in proximal relationship to the second member. The cam contour part has a flat surface part formed in parallel to a moving direction of the slide cam, in order to move only the trigger slider, while restraining the slide cam by contact pressure of the cam driven element to stop the slide cam temporary, when conveying the disc inside a cabinet toward an aperture side of the cabinet. The beam has a central portion with lower profile than its side portions and, as distinguished from the side portions, this lower central portion has a reinforcement in the form of a bent edge on at least one of the side flanges of the hat profile.