A stent delivery system includes an elongate delivery member a self-expanding proximal bumper disposed on a distal region of the delivery member in a radially contracted configuration, where the proximal bumper is biased to expand to a radially expanded configuration a self-expanding stent disposed over the delivery member in a radially contracted configuration distal of the proximal bumper and a sheath disposed over the stent, proximal bumper, and delivery member, and configured to constrain the proximal bumper and stent in their radially contracted configurations, where the proximal bumper, when in its radially expanded configuration, has a cross-sectional dimension greater than an inner diameter of the sheath, such that the proximal bumper contacts the sheath and prevents movement of the stent proximal of the proximal bumper, and such that, as the delivery member is moved distally relative to the sheath, the proximal bumper pushes the stent in a distal direction.
