Electrospinning Artificial Heart Valves
Riley showcases an innovative approach to building polymer structures through electrospinning, with a focus on creating artificial heart valves. Electrospinning utilizes an electric field to form fine threads of liquid polymer solution, such as polycaprolactone (PCL) dissolved in acetone. By applying a high voltage to a hypodermic needle containing the polymer solution and a conductive substrate, such as aluminum foil, the charged droplets transform into fine threads that accumulate on the substrate. Once the solvent evaporates, a delicate, non-woven plastic fabric is left behind.
For this project, Riley constructed an artificial heart valve by first creating a 3D-printed framework with three prongs, coated with conductive paint. He experimented with different designs before settling on a two-piece armature affixed to a rotating shaft. The PCL threads accumulated on this form, resulting in a one-piece structure resembling an artificial tricuspid heart valve. To remove the structure, a silicon grease release agent was used.
Although this heart valve is just a proof of concept, it demonstrates the potential of electrospinning for creating intricate polymer structures. It also highlights the versatility of additive manufacturing beyond traditional 3D printing methods. You can find more 3D printing projects and ideas on PiShop’s Blog similar to this one.
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