In-body tissue-engineered aortic valve (Biovalve type VII) architecture based on 3D printer molding.
In-body tissue architecture--a novel and practical regeneration medicine technology--can be used to prepare a completely autologous heart valve, based on the shape of a mold. In this study, a three-dimensional (3D) printer was used to produce the molds. A 3D printer can easily reproduce the 3D-shape and size of native heart valves within several processing hours. For a tri-leaflet, valved conduit with a sinus of Valsalva (Biovalve type VII), the mold was assembled using two conduit parts and three sinus parts produced by the 3D printer. Biovalves were generated from completely autologous connective tissue, containing collagen and fibroblasts, within 2 months following the subcutaneous embedding of the molds (success rate, 27/30). In vitro evaluation, using a pulsatile circulation circuit, showed excellent valvular function with a durability of at least 10 days. Interposed between two expanded polytetrafluoroethylene grafts, the Biovalves (N = 3) were implanted in goats through an apico-aortic bypass procedure. Postoperative echocardiography showed smooth movement of the leaflets with minimal regurgitation under systemic circulation. After 1 month of implantation, smooth white leaflets were observed with minimal thrombus formation. Functional, autologous, 3D-shaped heart valves with clinical application potential were formed following in-body embedding of specially designed molds that were created within several hours by 3D printer.
Division of Medical Engineering and Materials, National Cerebral and Cardiovascular Center Research Institute, Osaka, Japan.
Yasuhide
Y
Nakayama
Yoshiaki
Y
Takewa
Hirohito
H
Sumikura
Masashi
M
Yamanami
Yuichi
Y
Matsui
Tomonori
T
Oie
Yuichiro
Y
Kishimoto
Mamoru
M
Arakawa
Kentaro
K
Ohmuma
Tsutomu
T
Tajikawa
Keiichi
K
Kanda
Eisuke
E
Tatsumi
D000818:Animals; D001021:Aortic Valve; D006041:Goats; D006350:Heart Valve Prosthesis; D019918:Heart Valve Prosthesis Implantation; D066330:Printing, Three-Dimensional; D023822:Tissue Engineering / Q000379:methods*
3D printer; connective tissue; heart valve; surgery; tissue engineering