12 and be substantially fully retracted in a proximal direction wherein distal end 28 of guidewire 26 is in a proximal direction from distal end 14 of main body 12 with filter basket 32 in this position aspiration by suction can be applied to catheter main body to remove the debris from basket 32 in order to facilitate such aspiration proximal end 22 of lumen 18 can be sealed and thereby isolated from channel 17 within main body 12 at exit port 24 in this embodiment of the invention the distal end 20 of lumen 18 defines a wall which is circumferentially continuous throughout a full 360 u00b0 initially that axial position is proximate distal end 14 of main body 12 as previously discussed that location can be either slightly proximal or distal with respect to distal end 14 of main body 12 after lumen 18 collapses however that point becomes recessed within catheter main body 12 to a location illustrated at 41 thus filter basket 32 is able to be fully housed within catheter main body 12 referring to fig4 and 5 a second embodiment of the invention is illustrated the embodiment of fig4 and 5 is quite similar to that of fig2 and 3 in this embodiment however inner lumen 18 u2032 does not collapse still anchored and sealed at exit port 24 at its proximal end 22 u2032 lumen 18 u2032 does nevertheless allow for an apparent axial movement of the axial point at which lumen 18 u2032 is circumferentially continuous through a full 360 u00b0 this is accomplished by defining an axially extending line of perforation 21 in distal end 20 u2032 of lumen 18 u2032 as guidewire 26 is retracted.