Partially connected sleeve for an endoluminal device having an unconnected portion for portal access of an implantable device

A method of operating an endoluminal device, the method comprising:

• delivering the endoluminal device such that an implantable device is disposed in a collapsed, delivery configuration or a partially deployed configuration at a location within a vasculature, the implantable device having at least one opening providing access to an inner lumen of the implantable device, the implantable device having a constraining sleeve disposed around the implantable device, the constraining sleeve having a first connected portion including a distal portion of the constraining sleeve, a second connected portion including a proximal portion of the constraining sleeve, and an unconnected portion located between the first and second connected portions, the unconnected portion being adjacent to or overlaying the at least one opening when in the partially deployed configuration operable to provide access to the at least one opening from outside of the constraining sleeve;
• and
• at least partially removing the constraining sleeve from the implantable device to cause the implantable device to transition from the partially deployed configuration to an expanded, deployed configuration at the location within the vasculature.