Abstract: A latching mechanism for an instrument delivery system having a base, a slide tray, movable relative to the base between an opened position and a closed position, wherein the latching mechanism comprises: an actuating unit, including a push button mounted on the slide tray, for moving a member from a first position to a second position in response to movement of the push button from an extended position to a depressed position; and a latching unit for latching the slide tray in at least one of the opened position and the closed position when the member is in the first position and for unlocking the slide tray when the member is in the second position.

Abstract: A glaucoma needle is provided which combines goniopuncture with cautery for perpetuating a fistula in the sclera of the eye. The needle comprises a hollow casing forming a point, electrically activated thermal means which generate a thermal heat band on the casing, the band extending radially from the center of the casing and connector means for attaching the thermal means to a power supply. In the method of this invention the glaucoma needle is passed through the clear cornea, across the anterior chamber to the opposite anterior chamber angle and then out at the limbus to form a goniopuncture which is cauterized by the application of heat from the thermal heat zone created by the needle.