A metering delivery apparatus for injecting bone graft cement includes a body portion, a
material containment vessel, an actuator, and a control unit. The body portion includes a
drive housing that supports an actuator drivetrain and receiver end that supports the material
containment vessel. The actuator has a first end connected to the actuator drivetrain and a
second end that supports a moveable portion of the vessel to dispense material in the vessel
and a retracting movement that relieves pressure applied to the material. The control unit …