Patent ID: 9561356
Date: 2017-02-07
CPC Classifications: A61M,B81B,B81C,Y10T

Claim:
1. A method of manufacturing a microneedle comprising the steps of: (i) patterning a protective mask to form an etch opening in the protective mask for etching a wafer, the etch openings formed adjacent to an area of the wafer where the microneedle will be formed; (ii) first isotropic etching of an exposed area of the wafer at the etch opening to form a first cavity in the wafer; (iii) first anisotropic etching of the first cavity to define a head of the microneedle; (iv) second isotropic etching to form a shoulder of the microneedle, after the step (iii); (v) second anisotropic etching to form a shaft of the microneedle, after the step (iv); (vi) third isotropic etching to form a tip of the microneedle and to pattern a through hole, such that the tip of the microneedle detaches from the protective mask, after the step (v), and (vii) removing the protective mask after the step (vi).