Patent ID: 8808256

Claim:
A lacrimal insert comprising: a punctal plug having a cavity therein; and a microelectromechanical pump and reservoir positioned within the cavity of the punctal plug, the microelectromechanical pump being configured to deliver at least one therapeutic dosage of an active agent contained in the reservoir into an eye of a patient on demand, the microelectromechanical pump and reservoir comprises a piston assembly including a magnetically actuatable piston configured to deliver a first dose of the at least one active agent upon application of a magnetic field to move the piston from a neutral position to an on position, and a second dose of the at least one active agent upon removal of the magnetic field and a biasing mechanism for returning the piston from the on position to the neutral position, two channels connecting the reservoir to outlets in the pump, and at least one valve cooperatively associated with the biasing mechanism to control the flow of the at least one active agent through the two channels.