A flexible lubricous sheath which covers at least a distal portion of {TAIL ~ the flexible coil} of the instrument is provided with either contrasting colored stripes or palpable ridges, or both, which are located a predetermined distance from the distal end of {HEAD ~ the instrument} 
A flexible lubricous sheath which covers at least a distal portion of { TAIL ~ the flexible coil } of the instrument is provided with either contrasting colored stripes or palpable ridges , or both , which are located a predetermined distance from the distal end of { HEAD ~ the instrument }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD