sleeve 90 within housing bore 57 in the distal end of probe housing 52 locating projection 11 on the distal end of union sleeve 90 functionally engages alignment notch 13 in positioning wheel 31 thus rotating positioning wheel 31 likewise causes the rotation of piercer 70 this allows port 78 to be readily positioned anywhere within the 360 u00b0 axis of rotation of piercer 70 referring again to fig3 and 4 housing extension 47 is located at the proximal end of probe housing 52 housing flange 53 is located at the most proximal end of housing extension 47 on probe housing 52 and is assembled just inside of top shell front slot 55 in top shell 17 shell insert 39 is assembled into top shell front slot 55 first insert tab 59 and second insert tab 60 both located on shell insert 39 engage first shell recess 61 and second shell recess 63 located within top shell front slot 55 respectively thus upon complete assembly of probe assembly 42 the most proximal end of probe housing 52 containing housing flange 53 is trapped within gear shell 18 yet slideable along housing extension 47 distal and proximal within top shell front slot 55 tissue sampling surface 65 is a recessed surface within probe housing 52 which provides a surface where each tissue sample will be deposited during the operation of the present invention prior to retrieval by the clinician an elongated metallic tubular cutter 96 see fig5 is axially aligned within cutter bore 51 of probe housing 52 longitudinal bore 84 of union.