Design and analysis of an electromagnetically driven valve for a glaucoma implant

Though conventional implants have a capability of pressure regulation, they cannot maintain the intra-ocular pressure (IOP) desired for different patients. To solve these problems, an active glaucoma implant which consists of the valve actuator, pressure sensor, controller, and power supply, has been developed. In this paper, we first analyse of the operation of the conventional implant using a bond graph, and show its defects and limitations of the conventional valve analytically. Next, we design and analyze an electromagnetically driven valve actuator composed of a membrane, air-core solenoid, permanent magnet, and covering frame. To save the electrical power for operating the valve actuator, appropriate actuating methods are suggested and an optimal design of the valve actuator is carried out. Finally, using simulations, the possibility of the proposed valve actuator is investigated.