fixed in place relative to one another while sheath 26 and handle assembly 28 are locked together additionally sheath 26 and handle assembly 28 are maintained in axial alignment relative to one another by proximal end 49 of attachment member 46 which abuts stop 61 on upper portion 62 of handle assembly 28 as shown in fig5 thereby preventing inner rod stylet 24 from moving longitudinally within outer cannula 22 this likewise ensures a matched grind between the distal ends of cannula 22 and rod 24 therefore the user of biopsy device 20 can use a large amount of force if necessary to manipulate biopsy device 20 in order to penetrate tissue and or bone without undesired movement of the distal ends of outer cannula 22 and inner rod 24 relative to one another one application for which biopsy device 20 is particularly well suited is that of repairing crushed vertebrae in this type of application inner rod 24 typically comprises a sharpened stylet which is used to penetrate tissue in order to reach the vertebrae once outer cannula 22 and inner rod 24 have been positioned within the desired vertebra handle assembly 28 is removed from sheath 26 by means of release member 30 as described above in order to facilitate use of an imaging device to view the vertebral region to determine whether the distal end 34 of outer cannula 22 is in the desired location if it is.