tissues to be exposed to the probe 22 and 23 alternatively the sheath comprises a beveled or arcutate surface at the sheath terminus 129 capable of providing a means for hooking grasping or otherwise holding a tissue in proximity to the probe 22 and 23 in another embodiment the sheath provides a means for introducing a surgical device for example flexible biopsy forceps capable of manipulating tissues into a tissue space such that the surgical device can hold the tissue in proximity with the probe in one aspect of the invention as shown in fig5 the sheath comprises an inner sheath 121 and an outer sheath 108 the outer sheath may be connected to an retraction trigger not shown by one or more articulation means such as wires which is capable of moving the outer sheath with respect to the inner sheath each wire comprises a first end and second end the first end is affixed to the outer sheath 108 while the second end is affixed to a retraction trigger when the outer sheath 108 is slid back away from the terminus of the inner sheath 121 the tissues are exposed to cavitation energy emitted by the probe another aspect of this is referred to in fig1 where the firt sheath 107 is adapted to articulation wires not shown in the illustration in this embodiment moving the sheath exposes the probe to the lumen of a second sheath 121 comprising fenestrations which allow communication of the energy emitted from the probe to the lumen of a balloon catheter 91 in this aspect a probe can be operational without inflating the balloon catheter until movement of the first sheath exposes the probe thereby.