Endolumenal prothesis and method of use in bifurcation regions of body lumens

An endolumenal medical device assembly for engaging an interior surface of a body lumen wall at a bifurcation region of a body lumen, the bifurcation region including at least a first and a second branch lumen each having an entrance zone extending from a common branch lumen, comprising:

• an expandable prosthesis having an elongate prosthesis body with a proximal end portion, a distal end portion, a length along a longitudinal axis extending between the proximal and distal end portions, the length defined by a plurality of generally circular members, each formed of a plurality of substantially straight segments connected at axial bends, the circular members oriented adjacent each other such that at least one axial bend of one ring is directly connected to an axial bend of an adjacent ring and a plurality of side ports defined where the axial bend of one ring is spaced from the axial bend of an adjacent ring;
• a lateral expandable side port positioned along the length and defined by at least one of the generally circular members, the expandable prosthesis further being adjustable from a radially collapsed outer diameter, to a radially expanded outer diameter which is larger than the collapsed outer diameter;
• a delivery member having a proximal end portion and a distal end portion which is coupled to the expandable prosthesis, the delivery member being adapted to deliver the expandable prosthesis to the bifurcation region;
• an expansion member with a proximal end portion and a distal end portion which is removably engaged with the elongate prosthesis body, the distal end portion of the expansion member further being adapted to adjust the expandable prosthesis from the radially collapsed condition to the radially expanded condition when the elongate prosthesis body is engaged with the expansion member and is positioned at the bifurcation region;
• a dilator with a proximal end portion and a distal end portion which is engaged within the prosthesis passageway and also within the side port when the expandable prosthesis is in the radially collapsed condition, wherein the distal end portion of the dilator is adjustable from a first dilator position, wherein the side port has an initial inner diameter, to a second dilator position, wherein the side port is dilated to an expanded inner diameter which is larger than the initial inner diameter;
• a lateral expandable prosthesis having a lateral elongate prosthesis body with a proximal end portion, a distal end portion, and a lateral prosthesis lumen extending between a proximal end port located along the proximal end portion of the lateral elongate prosthesis body and a distal end port located along the distal end portion of the lateral elongate prosthesis body and a portion of the proximal end portion of the lateral expandable prosthesis is coupled to an axial bend the generally circular member defining the lateral expandable side port,
• the lateral expandable prosthesis being adjustable from a second radially collapsed condition, wherein the lateral elongate prosthesis body has a second collapsed outer diameter, to a second radially expanded condition, wherein the lateral elongate prosthesis body has a second expanded outer diameter,
• the proximal end portion of the lateral elongate prosthesis body being coupled to the elongate prosthesis body at a location adjacent to the side port, and
• wherein the distal end portion of the dilator is engaged within the lateral prosthesis lumen such that when the dilator is adjusted from the first dilator position to the second dilator position the lateral expandable prosthesis is expanded from the second radially collapsed condition to the second radially expanded condition.