Handheld Co-Axial Bioprinting: Application to in situ surgical cartilage repair.

Abstract:

:Three-dimensional (3D) bioprinting is driving major innovations in the area of cartilage tissue engineering. Extrusion-based 3D bioprinting necessitates a phase change from a liquid bioink to a semi-solid crosslinked network achieved by a photo-initiated free radical polymerization reaction that is known to be cytotoxic. Therefore, the choice of the photocuring conditions has to be carefully addressed to generate a structure stiff enough to withstand the forces phisiologically applied on articular cartilage, while ensuring adequate cell survival for functional chondral repair. We recently developed a handheld 3D printer called "Biopen". To progress towards translating this freeform biofabrication tool into clinical practice, we aimed to define the ideal bioprinting conditions that would deliver a scaffold with high cell viability and structural stiffness relevant for chondral repair. To fulfill those criteria, free radical cytotoxicity was confined by a co-axial Core/Shell separation. This system allowed the generation of Core/Shell GelMa/HAMa bioscaffolds with stiffness of 200KPa, achieved after only 10 seconds of exposure to 700 mW/cm2 of 365 nm UV-A, containing >90% viable stem cells that retained proliferative capacity. Overall, the Core/Shell handheld 3D bioprinting strategy enabled rapid generation of high modulus bioscaffolds with high cell viability, with potential for in situ surgical cartilage engineering.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Duchi S,Onofrillo C,O'Connell CD,Blanchard R,Augustine C,Quigley AF,Kapsa RMI,Pivonka P,Wallace G,Di Bella C,Choong PFM

doi

10.1038/s41598-017-05699-x

subject

Has Abstract

pub_date

2017-07-19 00:00:00

pages

5837

issue

1

issn

2045-2322

pii

10.1038/s41598-017-05699-x

journal_volume

7

pub_type

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