An expandable dilation member (308) may include a proximally-tapered portion (324(1)) to dilate a stricture. The dilation member (308) may be distally advanced in an unexpanded state over a wire guide through the stricture. The dilation member (308) may then be configured in an expanded state, where the dilation member (308) has a longitudinal profile that includes the proximally-tapered portion. A handle assembly (310) proximally pulls the dilation member (308) in the expanded state. In response, the proximally-tapered portion engages with and biases the stricture. When biasing the stricture, the proximally-tapered portion exerts a plurality of different types of forces, including a shearing force, a radial force, and in some procedures, a torsional force. The dilation member (308), when in an expanded state, comprises a plurality of constant-diameter portions (326(1), 326(2), 326(3)) comprising a maximum diameter portion (326(3) and a proximal portion (326(1), 326(2)) proximal to the maximum diameter portion, the proximal portion having a smaller diameter than the maximum diameter portion, wherein the dilation member does not have a diameter smaller than a diameter of the proximal diameter portion over a longitudinal length extending from the proximal portion to the maximum diameter portion.
