To adhere an artificial retinal implant onto the epiretinal surface of the eye, our group has designed retinal microtacks. The microtacks were fabricated by first bonding titanium foil to a silicon wafer; the tacks were then machined using an ultra-high precision micromilling technique with a 150-μm end-mill. The versatility of the micromilling technique allowed a partially conical, tapered tip to be added to the Ti tack, which created a sharp point. The Ti tacks average overall length and width were measured to be within 1% and 6%, respectively, of the design. Additionally, the grip width, stop thickness, and the tip taper angle of the Ti tacks were within 3%, 9%, and 4%, respectively, of the design.

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