Abstract: The objectives for the designs presented herein can be for a variably flexible catheter for vascular applications. The catheter can include a catheter shaft extending along a longitudinal axis. The catheter can include an exterior surface that includes an exterior surface area. The catheter can include a plurality of ridges each including an apex, an amplitude, a wavelength, and a trough with respect to the longitudinal axis. The apexes of the plurality of ridges can define a contact exterior surface area less than the exterior surface area. When the exterior surface of the catheter is applied to vascular tissue, contact between the vascular tissue made primarily by the contact exterior surface area.

Abstract: An occlusive device can include a braided segment including an open end, a pinched end, and an embolic coil. The tubular braid can include a band positioned approximate the pinched end which can attach the embolic coil to the braided segment. In a deployed configuration, the embolic coil can extend in a distal direction from the band and form a looped shape within an approximately spherical cavity, and the braided segment can extend from the band in a distal direction and include two inversion forming three sections which at least partially overlap each other, with the pinched end affixed to an innermost section, the band affixed to the innermost section, and a middle section between the two inversion positioned within an outermost section and around the innermost section.