In an aspect of some embodiments there is provided apparatuses and methods including a sleeve expander capable of covering with an implantable sleeve an exterior of a bodily vessel, along a chosen length thereof, the sleeve expander configured to maintain at least a portion of the implantable sleeve in an expanded size greater than a cross sectional dimension thereof when in apposition to the exterior. In some embodiments of the present invention, the apparatus further includes a cutting mechanism configured to cut down the implantable sleeve and/or external fixating means configured to fixate a covering section of the implantable sleeve to a corresponding covered section of the bodily vessel.