Patent ID: 8043362

Claim:
An apparatus, comprising: an expandable member configured to displace a first portion of a bone structure relative to a second portion of the bone structure when moved from a collapsed configuration to an expanded configuration; an elongate assembly including: a shaft defining a lumen; and an elongated member rotatably disposed within the lumen of the shaft; and an actuator coupled to a proximal end portion of the shaft, the actuator having a first component and a second component and operable to control twisting of the expandable member about the longitudinal axis of the elongated member, the actuator having a first position in which the first and second components remain engaged with each other to allow twisting of the expandable member about the longitudinal axis of the elongated member in a first direction and prevent twisting of the expandable member about the longitudinal axis of the elongated member in an opposing second direction, the actuator having a second position in which the first and second components are separated from each other to allow twisting of the expandable member about the elongated member in both the first and second directions, a proximal end portion of the expandable member being coupled to a distal end portion of the shaft such that the proximal end portion of the expandable member does not rotate relative to the distal end portion of the shaft when at least a portion of the expandable member is twisted about the elongated member through at least four revolutions, a distal end portion of the expandable member being coupled to a distal end portion of the elongated member such that the distal end portion of the expandable member does not rotate relative to the distal end portion of the elongated member when at least the portion of the expandable member is twisted about the elongated member through at least four revolutions.