Back in the 1970s, Delos “Toby” Cosgrove, a heart surgeon, was feeling frustrated. At that time, the field of open heart surgery was still in its infancy, and surgeons used a rigid ring to help restore the shape of a heart valve after surgery. Unfortunately, this ring did not work particularly well because it was too rigid to move with the human tissue. And although specialist medical labs and surgeons in operating theatres had sought to develop a better solution, nobody had found one that worked.
20世纪70年代，心脏外科手术医生迪洛斯•托比•科斯格罗夫(Delos "Toby" Cosgrove)感到很沮丧。当时，开心手术领域还处于起步阶段，外科医生在进行手术后使用一个刚性的环来帮助恢复心脏瓣膜的形状。不幸的是，由于这种环质地太硬，无法和人体组织同步移动，效果不是很好。尽管专业医学实验室以及奋战在手术室的外科医生都在寻找更好的解决办法，但没有人找到一种可行办法。
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