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美国卡内基梅隆大学的专家周四发表报告，表示已成功用3D生物打印机打印出可运作的心瓣。他们更认为将来可望打印出整个心脏，为需要移植心脏的病人带来希望。

研究团队复制了复杂的细胞外基质，即用来支撑细胞结构及提供令器官运作的生化信号之生物支架。他们又用胶原蛋白打印心瓣，最终成功令心瓣运作。以往专家尝试打印细胞外基质时，总会出现准确度不足及细致度不够的问题，但团队克服了此问题。

此外，虽然胶原蛋白在所有人体组织中出现，但常在打印时变成果冻状。团队于是用快速改变酸碱度的方法，令胶原蛋白准确地凝固。

不过，团队要先在动物身上做实验，然后才能将此技术用于人体。日后或可帮助心脏或肝脏功能受损的病人。研究报告已刊登于《科学》期刊中。