Structures to create cavities in the inner regions of bones.

When it is in the inoperative position, the physician can push or pull the control button (84) to move the blade (78) in a linear path within the catheter (see Fig. 20). By pushing the control button (84), the physician can move the blade (78) out of the catheter (68), which can rotate it until reaching the operating position (see Fig. 21). When it is in the operative position, the push-pull control knob (84) actuates the blade in linear strokes is against surrounding tissue mass. In use, the catheter (68) is also carried by sliding and rotation to within the guide or cannula (34) case in the same manner as shown in Fig. 4. The doctor can freely slide the catheter (68) axially within the guide sheath (34) to deploy the tool (56) in the targeted treatment area. To be deployed in the area to be worked, the physician can deploy the blade (78) in the operating condition outside the catheter (68) and slide the blade (78) along the tissue in a linear path. The linear movement of the blade (78) along tissue cuts the tissue. The physician can also rotate both the catheter (68) within the guide (34) sleeve, as the blade (78) within the catheter (68) to adjust the orientation and path of the blade (78). The blade (78) can possess one or more radiological markers (86), as described above, to allow radiologic visualization of the blade (78) within the targeted treatment area. The data (88) on the probe (80) may also allow the physician to visualize about the extent of linear or rotational movement of the blade (78). The distal end (76) of the catheter (68) may also have one or more markers (86).