Delivery systems and methods of endoluminal delivery of branched vascular endoprosthetic devices

A method of delivering a medical implant to a vasculature of a body, the method comprising:

• routing a first guidewire through a first lumen of a multi-lumen catheter extending between a distal end and a proximal end of the multi-lumen catheter;
• providing a delivery catheter having a leading end and a trailing end, the delivery catheter carrying a medical implant that includes a plurality of branch portals between the leading end and the trailing end of the delivery catheter, such that the leading end of the delivery catheter is disposed adjacent to the proximal end of the multi-lumen catheter, the medical implant being constrained by a first constraint and a second constraint;
• positioning at least one of a plurality of removable tubes through at least one of the branch portals for cannulation of the branch portals;
• extending a second guidewire through a second lumen and along at least a portion of the removable tubes, the second lumen extending between the distal end and the proximal end of the multi-lumen catheter;
• inserting the multi-lumen catheter into the vasculature through a first access site of the body;
• inserting the first guidewire through a delivery lumen of the delivery catheter;
• inserting the delivery catheter into the vasculature through a second access site of the body that is different from the first access site;
• abutting the delivery catheter against the multi-lumen catheter inside the vasculature such that the leading end of the delivery catheter abuts with the proximal end of the multi-lumen catheter, and the multi-lumen catheter and the delivery catheter are displaced together along and guided by the first guidewire and the second guidewire to deliver the medical implant;
• positioning the medical implant at a treatment site within the vasculature by adjusting a location of the multi-lumen catheter and the delivery catheter while the multi-lumen catheter and the delivery catheter remain abutted;
• releasing the first constraint that maintains at least a proximal portion of the medical implant in a delivery configuration to partially deploy the medical implant;
• and
• releasing the second constraint that maintains at least a middle portion of the medical implant at a diameter that is less than a fully deployed diameter of the medical implant following the release of the first constraint to fully deploy the medical implant.