Low-compliance expandable medical device

An apparatus, comprising:

• an elongate body;
• and
• an expandable member constructed with low-compliance material releasably coupled to the elongate body, the expandable member having a collapsed configuration and an expanded configuration, the expandable member configured to be percutaneously disposed entirely within an interior portion of a single vertebral body, the expandable member in the expanded configuration configured to be released from the elongate body and remain within the interior portion of the vertebral body after the elongate body has been removed from the vertebral body.

An apparatus, comprising:

• an elongate body defining a longitudinal axis;
• and
• an expandable member constructed with low-compliance material, the expandable member configured to be disposed within an interior portion of a vertebral body, the expandable member having a collapsed configuration and an expanded configuration, the expandable member when in the expanded configuration has a width substantially perpendicular to the longitudinal axis that is greater than a length substantially parallel to the longitudinal axis, the expandable member when in the expanded configuration configured to exert a pressure on cancellous bone disposed between the expandable member and an endplate of the vertebral body.