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. 2019 Jan 16;4(1):1401–1409. doi: 10.1021/acsomega.8b03164

Figure 4.

Figure 4

Series of CAD-designed hollow 3D microdevices were fabricated using the TPP-enabled DLW technique. Scale bar: 50 μm. (a,b) Hollow microneedles for enhanced pharmaceutical delivery. Left: Tilt angle-view. Right: Cross-section view. (c) Hollow microelectrode for neural recording and stimulation. Left: Tilt angle-view. Right: Cross-section view. (d) Hollow microvalve for biofluidic controlling. Left: Tilt angle-view. Right: Cross-section view. (e) Hollow microrobot for medical therapy. Left: Tilt angle-view. Right: Cross-section view.