A vascular access system for accurately locating body structures, such as blood vessels within a patient includes a flexible probe for applying Doppler ultrasonic techniques that has {HEAD ~ a relatively adjustable length} relative to {TAIL ~ a needle assembly} 
relative to
A vascular access system for accurately locating body structures , such as blood vessels within a patient includes a flexible probe for applying Doppler ultrasonic techniques that has { HEAD ~ a relatively adjustable length } relative to { TAIL ~ a needle assembly }
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 HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL