Stent including anchoring members

A method for treating a fistula in an intestine, the method comprising:

• advancing an expandable scaffold to a target site at the fistula within the intestine and positioning the expandable scaffold across the fistula, the expandable scaffold including:
• a first end portion, a second end portion and a medial portion extending along a longitudinal axis of the scaffold, the medial portion positioned between the first end portion and the second end portion, the expandable scaffold configured to shift from a contracted state to an expanded state;
• a retainer releasably attached to the medial portion;
• radially expanding the first end portion and the second end portion from the contracted state to the expanded state such that the first end portion and the second end portion directly contact the inner surface of the intestine on opposite sides of the fistula in the expanded state;
• and
• anchoring the first end portion and the second end portion to the intestine with one or more anchors to prevent the first end portion and the second end portion from shifting along the inner surface of the intestine.

A medical device for treating a single body lumen, comprising:

• an expandable scaffold including a first end portion, a second end portion, and a medial portion extending along a longitudinal axis therebetween, the first end portion, the second end portion, and the medial portion all configured to shift from a contracted state to an expanded state;
• each of the first end portion and the second end portion including one or more anchors configured to anchor the first end portion and the second end portion directly to an inner surface of the single body lumen to prevent the first and second portions from shifting along the inner surface of the single body lumen when the first end portion and the second end portion are directly engaged with the inner surface of the single body lumen in the expanded state on opposite sides of a fistula;
• and
• wherein the medial portion is configured to shift from the contracted state to the expanded state after the first end portion and the second end portion have shifted from the contracted state to the expanded state, wherein the medial portion is configured to foreshorten along the longitudinal axis when shifting from the contracted state to the expanded state, thereby drawing the expanded first end portion and the second end portion closer together along the longitudinal axis as the medial portion shortens to close the fistula.