Patent ID: 8870888

Claim:
A system for injecting an incompressible low viscosity fluid into a bone cement reservoir adapted to be engaged with a cannula through which a high viscosity bone cement is transferred from the bone cement reservoir to a bone element, the system comprising a control handle having a body, a grip portion at an outer end of the body and a central thumb-actuated power piston, the grip portion being configured for receiving at least two fingers a user such as to permit actuation of the control handle by the single hand of the user, the body including the power piston and a cylindrical low viscosity fluid reservoir concentrically disposed relative to each other, the low viscosity fluid reservoir containing the incompressible low viscosity fluid and the power piston having a power piston tube extending longitudinally through a center of the cylindrical low viscosity fluid reservoir such that the low viscosity fluid reservoir defines an annular shape and surrounds the power piston tube within the body, the power piston having a first plunger displaceable within the power piston tube, the annular low viscosity fluid reservoir containing a second plunger therein, the second plunger being annular and displaceable within the low viscosity fluid reservoir, the power piston tube having an inlet thereto in communication with the low viscosity fluid reservoir such that the low viscosity fluid in the low viscosity fluid reservoir is displaced by the second plunger out of the low viscosity fluid reservoir and into the power piston tube, and the power piston tube having an outlet through which the low viscosity fluid therein is expelled under pressure when the first plunger of the power piston is depressed by the thumb of the user.