An apparatus for delivering bone cement into a vertebra, includes a
cannula, a delivery device in communication with the cannula and a
pressure delivery device in communication with the delivery device. The
pressure delivery device provides an actuating force that acts either
directly or through a medium to cause a flowable compound to be delivered
from the delivery device to the cannula and into the vertebra. The
pressure delivery device causes a pressurized compound to be delivered,
the pressurized compound may be liquid or gaseous CO.sub.2 or other
mediums.