Approval Order Statement Approval for modifications to the valve holders for the hancock ii bioprosthesis. The holders are to be used with the following approved valve models and sizes: hancock ii porcine bioprosthesis, model t505 (aortic, sizes 21, 23, 25, 27, and 29 mm. These aortic valves are indicated for the replacement of malfunctioning native or prosthetic aortic valves. |