• Jungsung, Kim
  • Professor
  • Konyang University

Curriculum Vitae

Education

Ph.D, Yonsei University(2011)
Ph.D Candidate, Management of Technologies, HanyangUniversity(2016)

Professional Experience

Konyang University 3D Fusion Technology Institute, Director (2014 ~ Current)
Konyang University, K-ICT 3D Printing Center, Director (2016 ~ 2017)
Industry-Academic Cooperation Foundation, Konyang University, Vice-president (2014 ~ 2015)
Corentec Co., Ltd. R&D Center, CTO/Director (2006 ~ 2014)

Research Interests

Medical 3D Printing in Orthopaedic and neurosurgery fields
Design and analysis of the artificial joints, spinal implants, trauma implants and cranofacial implans

Honors & Awards

2013. Minister of Food and Drug Safety Award
2012. Minister of Knowledge Economy Award

Publications

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Abstract

Medical Application of the metal 3D printing : Study of mechanical properties on the titanium interbody fusion cage

Many attempts of applying 3D printing technology in medical fields have been done since 3D printing technology was introduced. 3D printing is done by building up layers of powder or liquid materials so it made possible to build structures that was difficult to do it by traditional machining works. 3D printed medical devices have been used applied in orthopedic especially. Mechanical properties are very important for safety and stability in orthopedic device because medical device has strength and elastic modulus to retain until bone regeneration. Commonly Titanium and PEEK are used in spinal interbody fusion. Titanium materials have good char-acteristics to integrate with bone and good strength more than polymeric materials, but have possibility to subside into the bone caused by high elastic modulus. On the other hand, PEEK Materials have so low elastic modulus that stress shielding is avoided. However lack of bone ingrowth characteristics is disadvantage.
If we control the parameters of porous structure, elastic modulus of titanium cage could be decreased like polymer cage or less. In this study, 3D porous posterior lumbar interbody fusion cage is designed with 3 types of porous structures to reduce stiffness like as bone or PEEK. The parameters of porous structure, as like pore size, strut thickness, unit cell size, and porosity, were tunable for controlling elastic modulus. Furthermore inner frame parts at anterior and posterior in cage were designed to enhance the strength of cage. Then we fabricated 3D porous cages by metal 3D printer with pure titanium(Grade 4). To evaluate strength and stiffness, analysis of mechanical properties was performed through mechanical test with fabricated cages.
As results of comparison with PEEK cage, it is showed stiffness of metal fusion cages with porous structure were decrease as like PEEK cages. Additionally, yield loads were increased in porous metal cages with frame parts.
3D metal fusion cage can induce to integrate with bone, caused by biocompatible material titanium, and reduces subsidence. Consequently, the mechanical properties of metal cage could be controlled as designer’s intent. So, we expect that success of interbody fusion is increased through bone integration and mechanical stability.
In the future, the study of 3D metal prosthesis is needed more in clinical study besides mechanical analysis under fatigue load.