Affiliations: [a] Division of Cardiovascular Surgery, College of Medicine, National Cheng Kung University, Tainan, Taiwan | [b] Department of Pediatrics, National Cheng Kung University Hospital Tainan, Tainan, Taiwan | [c] Department of Electrical Engineering, Kao-Yuan University, Kaohsiung, Taiwan | [d] Department of Engineering and Maintenance, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan | [e] Heart Science and Medical Devices Research Center, National Cheng Kung University, Tainan, Taiwan | [f] Department of Veterinary Medicine, National Chiayi University, Chiayi, Taiwan
Abstract: Pulmonary valve diseases include the different degrees of aortic stenosis or congenital defects in children or adults. Valve repair or replacement surgery is commonly performed to relieve valvular dysfunction and improve the significant flow regurgitation in the aortic valve and the pulmonary valve. However, commercial valve stents and valved conduits are sometimes not available for children or patients with special conditions. The handmade trileaflet valve design has been used with different range of diameters for patch-valved conduit reconstruction. Thus, we propose a multiple regression model, as a generalized regression neural network (GRNN), to determine the optimal trileaflet parameters, including the width, length, and upper lower curved structure. Through computed tomography pulmonary angiography, while the diameter of the main pulmonary artery is determined, a leaflet template can be rapidly sketched and made. Using an experimental pulmonary circulation loop system, the efficacy of the valved conduit can be validated using the regurgitation fraction method. In contrast to commercial valve stents, experimental results indicate that the handmade trileaflet valve can also improve severe pulmonary regurgitations.
