A vascular treatment device for use in a vessel includes a
catheter and a microvalve occluder. The occluder includes braided elastic strands, each with a proximal portion, a central portion, and a
distal portion, that are fixed to the outer surface of the
catheter. The elastic strands. In an embodiment, the distal portions are attached circumferentially about an outer surface of the
catheter at a location toward the distal end of the catheter, the central portions extend proximal and radially outward from the distal end, and the proximal portions of the strands are inverted back radially within the central portions are and coupled circumferentially about the outer surface of the catheter at a location proximally displaced from the distal portions. The proximal portion of the microvalve is coated in a fluid-impermeable membrane, and the distal portions of the strands are substantially uncoated.