Open Access
ARTICLE
Research on the Microstructure Construction Technology of Fully Degraded Polymer Vascular Stent Based on Electric Field Driven 3D Printing
Yanpu Chao1,*, Fulai Cao1, Hao Yi2,3,*, Shuai Lu1, Yaohui Li1, Hui Cen1
1
College of Mechatronics, Xuchang University, Xuchang, 461000, China
2
College of Mechanical Engineering, Chongqing University, Chongqing, 400044, China
3
State Key Laboratory of Mechanical Transmissions, Chongqing University, Chongqing, 400044, China
*
Corresponding Authors: Yanpu Chao. Email: chaoyanpu@163.com, 12014026@xcu.edu.cn; Hao Yi. Email: haoyi@cqu.edu.cn
Fluid Dynamics & Materials Processing https://doi.org/10.32604/fdmp.2024.051962
Received 19 March 2024; Accepted 11 June 2024; Published online 17 July 2024
Abstract
The so-called fourth-generation biodegradable vascular stent has become a research hotspot in the field of bioengineering because of its good degradation ability and drug-loading characteristics. However, the preparation
of polymer-degraded vascular stents is affected by known problem such as poor process flexibility, low forming
accuracy, large diameter wall thickness, limited complex pore structure, weak mechanical properties of radial support and high process cost. In this study, a deposition technique based on a high-voltage electric-field-driven continuous rotating jet is proposed to fabricate fully degraded polymer vascular stents. The experimental results show
that, due to the rotation of the deposition axis, the deposition direction of
PCL (polycaprolactone) micro-jet is
always tangent to the surface of the deposition axis. The direction of the viscous drag force is also consistent with
the deposition direction of the jet. It is shown that by setting different rotation speeds of deposition axis ω and
linear motion speeds of the nozzle V, the direction of rotation, pitch and angle of the individual printed spiral
curve can be precisely tuned. In the process of multiple spiral curves matching the deposition forming thin wall
tube mesh, the mesh shape and size of the thin wall tube can be accurately controlled by changing the number of
matching spiral curves and the size of the matching position bias distance. Finally, the characteristics of a
PCL
tubular stent sample (with uniform-size microfibers and mesh shape), fabricated under the appropriate process
parameters are described in detail.
Keywords
Electric field driven; micro-jet; spiral curve; polymer vascular stent
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