A steerable cannula for delivering bone filler comprises a delivery pipe (10), a delivery handle (30) fixedly connected to the proximal end of the delivery pipe, a sheath-core (20) slidably inserted into the delivery pipe and a sheath-core handle (40) fixedly connected to the proximal end of the sheath-core. Distal portion of the delivery pipe is a flexible pipe (11) and proximal portion thereof is a rigid pipe (12). The sheath-core has a cavity. Distal portion of the sheath-core is a flexible segment (21) and the proximal portion thereof is a rigid segment (23). A pull thread is provided in the cavity of the sheath-core, wherein distal end of the pull thread is fixedly connected to the distal end of the flexible segment of the sheath-core and proximal end thereof is connected to a drawing means arranged on the sheath-core handle.
