A method of disrupting flow through a fistula may include deploying a flow disruptor across the fistula through a microcatheter at a point in vasculature proximate to the fistula. Deploying the flow disruptor may include expanding a first bulb on a first side of the fistula and expanding a second bulb on a second side of the fistula, the flow disruptor including a neck between the first bulb and the second bulb and traversing the fistula. The first bulb may have a first braid angle, the second bulb may have a second braid angle, and the neck may have a third braid angle less than the first braid angle and the second braid angle.
