TY - EJOU
AU - Chen, Xiaojun
AU - Wang, Di
AU - Dou, Wenhao
AU - Wang, Yimeng
AU - Yang, Yongqiang
AU - Wang, Jianhua
AU - Chen, Jie
TI - Design and Manufacture of Bionic Porous Titanium Alloy Spinal Implant Based on Selective Laser Melting (SLM)
T2 - Computer Modeling in Engineering \& Sciences
PY - 2020
VL - 124
IS - 3
SN - 1526-1506
AB - In order to meet the clinical requirements of spine surgery, this paper
proposed the exploratory research of computer-aided design and selective laser
melting (SLM) fabrication of a bionic porous titanium spine implant. The structural design of the spinal implant is based on CT scanning data to ensure correct
matching, and the mechanical properties of the implant are verified by simulation
analysis and laser selective melting experiment. The surface roughness of the
spinal implant manufactured by SLM without post-processing is Ra 15 μm, and
the implant is precisely jointed with the photosensitive resin model of the upper
and lower spine. The surface micro-hardness of the implant is HV 373, tensile
strength σb = 1238.7 MPa, yield strength σ0.2 = 1043.9 MPa, the elongation is
6.43%, and the compressive strength of porous structure under 84.60% porosity
is 184.09 MPa, which can meet the requirements of the reconstruction of stable
spines. Compared with the traditional implant and intervertebral fusion cage,
the bionic porous spinal implant has the advantages of accurate fit, porous bionic
structure and recovery of patients, and the ion release experiment proved that
implants manufactured by SLM are more suitable for clinical application after certain treatments. The elastic modulus of the sample is improved after heat treatment,
mainly because the microstructure of the sample changes from α’ phase to α + β
dual-phase after heat treatment. In addition, the design of high-quality bionic porous
spinal implants still needs to be optimized for the actual needs of doctors.
KW - Selective laser melting (SLM); titanium; spinal implant; bionic porous
DO - 10.32604/cmes.2020.09619