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. Author manuscript; available in PMC: 2022 Feb 22.
Published in final edited form as: IEEE Access. 2020 Oct 2;8:181411–181419. doi: 10.1109/access.2020.3028374

Fig. 2:

Fig. 2:

A photograph of a curved, helically patterned needle. The insets show the helical patterning and the hinge design under a microscope.