Delivery system and method of use for deployment of self-expandable vascular device

A delivery system comprising:

• a catheter having a distal portion and a proximal portion;
• a balloon disposed on the distal portion of the catheter;
• a self-expanding prosthesis disposed on at least a portion of the balloon, the self-expanding prosthesis having a compressed state and an expanded state;
• and
• a sheath coupling the self-expanding prosthesis to the balloon when the self-expanding prosthesis is in its compressed state, wherein:
• the sheath includes an opening in a wall of the sheath that initiates rupturing of the sheath so that the self-expanding prosthesis may move from its compressed state to its expanded state,
• a distal end portion of the balloon that is distal to a distal end of the sheath includes an enlarged diameter portion, the enlarged diameter portion having approximately a same outer diameter as an outer diameter of the sheath when the self-expanding prosthesis is in its compressed state, and the enlarged diameter portion being the maximum outer diameter of the balloon when the self-expanding prosthesis is in its compressed state,
• the opening is at the distal end of the sheath, and
• the enlarged diameter portion having approximately the same outer diameter as the outer diameter of the sheath when the self-expanding prosthesis is in its compressed state ensures that inflation of the balloon initiates rupturing of the sheath at the opening.