Patent ID: 7762981
Filing Date: 2010-07-27
Classification: A61F,A61M

Abstract:
1. An ophthalmic injection device comprising: a dispensing chamber housing having an inner surface and an outer surface, the inner surface partially defining a dispensing chamber for holding a quantity of a substance; a plunger engaged with the inner surface of the dispensing chamber housing, the plunger capable of sliding in the dispensing chamber housing, the plunger fluidly sealed to the inner surface of the dispensing chamber housing; a temperature control device at least partially surrounding the dispensing chamber housing, the temperature control device for altering a temperature of the substance in the dispensing chamber; a power source for providing power to the temperature control device; a controller for controlling the temperature control device; an actuator for driving the plunger; and a temperature release mechanism that activates the actuator when the substance is in a temperature range; the temperature release mechanism comprising a shape memory alloy member, a disk with an aperture, and a triggering device, the shape memory alloy member coupled to the disk so that as the shape memory alloy member changes shape the disk is moved into a position to allow the triggering device to be activated.