For example, the internal diameter of {HEAD ~ the tubular body} or cannula is normally in the range of 5 to 20 mm., or more, although {TAIL ~ other sizes} such as larger oval shapes may be employed, if desired 
For example , the internal diameter of { HEAD ~ the tubular body } or cannula is normally in the range of 5 to 20 mm . , or more , although { TAIL ~ other sizes } such as larger oval shapes may be employed , if desired
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH