Apparatus for mixing and dispensing a multi-component bone cement

An apparatus for mixing and dispensing a multi-component compound to a cannula, comprising:

• a tubular body defining an internal chamber for mixing the multi-component compound therein, the tubular body having a distal end comprising an opening in communication with the internal chamber;
• a rod disposed within the tubular body, said rod having a proximal end extending out of the tubular body and a distal end extending into the tubular body;
• a moveable piston separate from and contained within the tubular body;
• a sensor for sensing a characteristic of the compound within the apparatus;
• an output valve having an inlet in fluid communication with said opening in said distal end of the tubular body, said output valve having a first outlet in fluid communication with a patient delivery lumen and a second outlet in fluid communication with a shunt lumen, said output valve configured to direct flow from the opening into either the patient delivery lumen or the shunt lumen, said output valve operably coupled to said sensor;
• a selectable locking mechanism carried by said rod, said locking mechanism having a first selectable configuration in which said locking mechanism allows said rod to move substantially freely relative to said piston and a second selectable configuration which couples said rod to said piston such that distal movement of said rod causes said piston to move distally through said tubular body.