Patent ID: 8382703

Claim:
A piezoelectric dual-syringe insulin pump, comprising: first and second Z-shaped members; a dual rail assembly, the first and second Z-shaped members each having a first leg portion slidably disposed through a first rail portion and a second rail portion, respectively; a piezoelectric motor having a screw drive actuator, the actuator having a first end engaging the first Z-shaped member and an opposing second end engaging the second Z-shaped member; biasing force members indirectly applying opposing biasing forces against the opposing ends of the screw drive actuator through the Z-shaped members; a first syringe adapted for holding a fast-acting insulin medication, the first syringe having a first plunger, the first Z-shaped member having a second leg portion bearing against the first plunger; a second syringe adapted for holding a slow-acting insulin medication, the second syringe having a second plunger, the second Z-shaped member having a second leg portion bearing against the second plunger; a dual-syringe injector, the first and second syringes being in fluid connection with the dual-syringe injector; and a voltage source selectively energizing the piezoelectric motor; wherein when the voltage source energizes the piezoelectric motor, the motor drives the screw drive actuator member against the bias applied through the first Z-shaped member, thereby depressing the first plunger to dispense a measured dose of the fast-acting insulin medication to a patient if the voltage source is of a first polarity, or causes the motor to drive the screw drive actuator in the opposite direction to depress the second plunger to dispense a measured dose of the slow-acting insulin medication to the patient if the voltage source is of a polarity opposite the first polarity.