Brian P. Dunleavy, UPI, 16 Feb 2021
via ACM TechNews; Friday, February 19, 2021

Carnegie Mellon University researchers have developed a new approach to
three-dimensional (3D) bioprinting that fixes problems caused by gravity in
the bioinks. The Freefrom Reversible Embedding of Suspended Hydrogels
approach involves 3D printing in a "support bath," which holds the bioinks
in place until they are cured and provides an environment that maintains
high cell viability. Use of the support bath overcomes the challenges of 3D
printing soft materials in air, as gravity distorts soft and liquid bioinks
that are deposited in a layer-by-layer manner using a syringe pump. Although
the technology already has been used to bioprint functional heart valves and
contractile cardiac ventricles, Carnegie Mellon's Daniel J. Shiwarski said
clinical use of printed tissue is "still years away."

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