This work investigates an additive manufacturing process, micro-Robotic Deposition (μRD), and its utility in fabricating advanced architecture synthetic bone grafts. The objective of this research is to develop a method to integrate different regions with different porous microstructures into a single scaffold; there is evidence that scaffolds with designed regions of specific microstructures can be used to elicit a strong and directed bone ingrowth response that improves bone ingrowth rate and quality. The key contribution of this work is integration of a control algorithm that precisely places different build materials in specified locations with a workflow that enables near-net shape fabrication, thereby the fabrication of advanced architecture scaffolds is feasible. Under previous control methods, designs were relegated to be composed of a single material with simple contours. Scaffolds with contoured forms, multiple domains with distinct porous microstructures, and hollow cavities are feasible when the developed controller is used in conjunction with a novel manufacturing workflow in which scaffolds are filled within patterned molds that support overhanging features.
- Dynamic Systems and Control Division
Near-Net Shape Structures Fabricated by Micro-Robotic Deposition Using Precision Extrusion Control
Hoelzle, DJ, Alleyne, AG, & Wagoner Johnson, AJ. "Near-Net Shape Structures Fabricated by Micro-Robotic Deposition Using Precision Extrusion Control." Proceedings of the ASME/ISCIE 2012 International Symposium on Flexible Automation. ASME/ISCIE 2012 International Symposium on Flexible Automation. St. Louis, Missouri, USA. June 18–20, 2012. pp. 271-278. ASME. https://doi.org/10.1115/ISFA2012-7240
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