In this thesis, a dual-valved GDD to fulfill the "band-pass" flow regulation has been developed and in vitro/ex vivo tested. Our GDD has been verified capable of draining out eye fluid when IOP is higher than 20 mmHg, and stopping the drainage when IOP is lower than 20 mmHg to prevent hypotony. A new IOP sensor is proposed with a new implantation location so that the quality factor can be retained and also the concern of water filling the capacitor chamber is solved. To accurately design the

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... ired cracking pressure and also predict the life-time of a NC check-valve, parylene-C's mechanical, thermal and polymer properties are investigated. The results show that paryelne-C is a highly temperature-sensitive material, and therefore it can be tailored by thermal annealing to obtain the desired properties. In chapter 2, a paradigm of NC check-valve is proposed with several slanted tethers to transmit the necessary downward force and therefore the NC check-valve is capable of supplying the desired cracking pressure. The desired residual tensile stress can be achieved by stretching the tethers based on several mechanisms such as: popup/self-stiction mechanisms; or by thermal annealing the tethers at the elevated temperature, and then quenching them down to room temperature to introduce the high thermal tensile stress. Therefore, three different approaches are developed to create the slanted tethers: generating and adopting sloped sacrificial photoresist, using pop-up