By 1946, Smithy had devised a valvulotome to cut away scar tissue from the aortic valve and had made a presentation on the subject at an American College of Surgeons (ACS) forum.
Smithy had devised a valvulotome to cut away scar tissue from the aortic valve. This was by 1946. Smithy had made a presentation on the subject at an American College of Surgeons (ACS) forum. This was by 1946.