Expandable medical devices

A medical device comprising:

• (a) an elongated tubular body having a proximal end and a distal end;
• (b) an expandable element at the distal end of the elongated tubular body;
• (c) an expandable tubular sleeve surrounding at least a portion of the expandable element and including a plurality of discrete zones, wherein the discrete zones have varying levels of radial strength;
• wherein the expandable element and the expandable tubular sleeve provide a longitudinal tension to an implantable device such that the implantable device is prevented from longitudinal compression, and the expandable tubular sleeve is configured in an expansion sequence dictated by the varying levels of radial strength of the plurality of discrete zones to:
• expand at a first zone of the plurality of discrete zones with a weakest radial strength first in response to applying a first expansion pressure to the expandable tubular sleeve, and
• subsequently expand at a second zone of the plurality of discrete zones with a stronger radial strength than the first zone in response to applying a second expansion pressure greater than the first expansion pressure.