proximal end of the shaft to cause the shaft and exchange member to separate in the alternative the shaft and exchange member may be affixed by appropriate glue for example whose adhesive properties would lessen with time hydration or temperature such that after 24 to 48 hours the shaft could be detached and withdrawn for example the adhesive bonding properties of a hydrogel adhesive would diminish with hydration in the embodiment of the invention shown in fig7 and 8 the recs 20 comprises a coil 21 preferably a radiopaque coil and a rigid shaft or pushing wire 22 positioned eccentrically or concentrically preferably eccentrically around shaft 22 is a flexible collapsible sheath 23 shown collapsed in fig7 and expanded in fig8 at the proximal end of sheath 23 is a hemostatic manifold 24 including a valved infusion port 25 in fluid communication with the interior of sheath 23 in the alternate embodiment shown in cross section in fig9 and 10 sheath 32 is bonded or formed with shaft 30 which defines lumen 31 pushing wire 33 extends longitudinally within lumen 31 sheath 23 or 32 extends distally to at least the distal end of pushing wire 22 or 33 where exchange member 21 is instead a cylindrical tubular member such as exchange member 2 the sheath 23 or 32 can extend into and or through said exchange member sheath 23 or 32 facilitates the passage of a second ptca catheter guidewire or other exchangeable device after the first device is removed and provides for atraumatic passage of these.