An endograft device for endovascular repair of ascending aortic aneurysms, comprising: a first prosthetic component ; and a second prosthetic component ; the first prosthetic component comprising: a proximal frame with an outer surface that is covered with a nonporous covering material such that fluid is prevented from passing therethrough, and a self-expanding elongated distal frame secured to a distal end of the proximal frame, wherein the self-expanding elongated distal frame extends to a distal end of the first prosthetic component, wherein the self-expanding elongated distal frame is formed in an open-cell configuration that is uncovered such that fluid is permitted to pass through openings formed therein, wherein the self-expanding elongated distal frame is configured to span the three arteries of the aortic arch when delivered to the patient; the second prosthetic component comprising: a frame that extends from a proximal end to a distal end ; wherein the first prosthetic component is configured to, when implanted in a patient's aorta, extend distally into an arch of the patient's aorta ; wherein the frame is configured to engage with a valve element at a proximal end of the second prosthetic component; wherein a distal end of the second prosthetic component is configured to be secured to a proximal end of the first prosthetic component after the first prosthetic component has been implanted in a patient's aorta. a first prosthetic component ; and a second prosthetic component ; the first prosthetic component comprising: a proximal frame with an outer surface that is covered with a nonporous covering material such that fluid is prevented from passing therethrough, and a self-expanding elongated distal frame secured to a distal end of the proximal frame, wherein the self-expanding elongated distal frame extends to a distal end of the first prosthetic component, wherein the self-expanding elongated distal frame is formed in an open-cell configuration that is uncovered such that fluid is permitted to pass through openings formed therein, wherein the self-expanding elongated distal frame is configured to span the three arteries of the aortic arch when delivered to the patient; a proximal frame with an outer surface that is covered with a nonporous covering material such that fluid is prevented from passing therethrough, and a self-expanding elongated distal frame secured to a distal end of the proximal frame, wherein the self-expanding elongated distal frame extends to a distal end of the first prosthetic component, wherein the self-expanding elongated distal frame is formed in an open-cell configuration that is uncovered such that fluid is permitted to pass through openings formed therein, wherein the self-expanding elongated distal frame is configured to span the three arteries of the aortic arch when delivered to the patient; the second prosthetic component comprising: a frame that extends from a proximal end to a distal end ; wherein the first prosthetic component is configured to, when implanted in a patient's aorta, extend distally into an arch of the patient's aorta ; wherein the frame is configured to engage with a valve element at a proximal end of the second prosthetic component; wherein a distal end of the second prosthetic component is configured to be secured to a proximal end of the first prosthetic component after the first prosthetic component has been implanted in a patient's aorta. <EOS>