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Fabrication Techniques of Nerve Guidance Conduits for Nerve Regeneration
강내운,이승재,곽소정 연세대학교의과대학 2022 Yonsei medical journal Vol.63 No.2
Neuronal loss and axonal degeneration after spinal cord injury or peripheral injury result in the loss of sensory and motor functions. Nerve regeneration is a complicated and medical challenge that requires suitable guides to bridge nerve injury gaps and restorenerve function. Due to the hostility of the microenvironment in the lesion, multiple conditions should be fulfilled to achieveimproved functional recovery. Many nerve conduits have been fabricated using various natural and synthetic polymers. The designand material of the nerve guide conduits were carefully reviewed. A detailed review was conducted on the fabrication methodof the nerve guide conduit for nerve regeneration. The typical fabrication methods used to fabricate nerve conduits are dipcoating, solvent casting, micropatterning, electrospinning, and additive manufacturing. The advantages and disadvantages of thefabrication methods were reported, and research to overcome these limitations was reviewed. Extensive reviews have focused onthe biological functions and in vivo performance of polymeric nerve conduits. In this paper, we emphasize the fabrication methodof nerve conduits by polymers and their properties. By learning from the existing candidates, we can advance the strategies fordesigning novel polymeric systems with better properties for nerve regeneration.
이중기공 세포지지체 제작을 위한 powder extruder 개발
강내운(Nae-Woon Kang),이세환(Se-Hwan Lee),김희경(Hee-Kyeong Kim),조영삼(Young-Sam Cho),이승재(Seung-Jae Lee) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
Prior to our study, a novel technique was developed through combining SLUP(Salt Leaching Using Powder) and WNM(Wire-Network Molding) techniques to fabricate dual-pore scaffold. The advantages of this technique are solvent-free, high temperature-free, the pore interconnectivity and high porosity. Additionally, cell-proliferation(in vitro) of a dual-pore scaffold was faster than that of a scaffold fabricated by bio-plotting and SLUP technique. However these techniques have a disadvantage. For example, the scaffold fabrication process was manually. Therefore, it takes a long time and effort to make several scaffolds. In this study, we developed the powder extruder to fabricate dual-pore scaffold. The material was used for PCL(Polycaprolactone) and NaCl. The powder extruder was used as the basis for a 3D printer(Delta bot). The head of powder extruder was extruded using a screw. We compared characteristics of SLUP&WNM method with the powder extruder method for dual-pore scaffold fabrication