3D printing fabrication process for fine control of microneedle shape

Abstract Microneedle electrode (ME) is used to monitor bioelectrical signals by penetrating via the skin, and it compensates for a limitation of surface electrodes. However, existing fabrication ME have limited in controlling shape microneedles, which directly relevant performance durability microneedles as an electrode. In this study, novel method using 3D printing developed control needle bevel angles. By angle direction, angles are changed. Various direction (0–90°) investigated fabricate moldings, those moldings microneedle fabrications biocompatible polyimide (PI). The height implementation rate aspect ratio also optimize PI microneedles. penetration test fabricated conducted porcine skin. 1000 μm 40° showed 54.5°, can penetrate result demonstrates that suggested be applied various polymeric materials shape.