A passive stent for retaining an organ in an expanded state configured to adhere and substantially conform to an external surface of the organ may include an inner layer, an outer layer, and a middle layer that is enclosed by the inner layer and the outer layer, comprising a plurality of components configured to interlock and maintain the organ in an expanded state upon application of a vacuum. A method for retaining an organ in an expanded state may include applying at least one force to the organ to place the organ in the expanded state; applying a passive stent to an external surface of the organ; and applying a vacuum to the passive stent sufficient to cause a plurality of components of at least one layer of the passive stent to interlock, where the at least one layer is configured to maintain the organ in the expanded state after interlocking.