{TAIL ~ The obturator} retracts as the needle is penetrated through {HEAD ~ skin}, and extends forwardly as soon as the needle enters the patients body, thus helping to protect the patient against accidental injury from the needle 
{ TAIL ~ The obturator } retracts as the needle is penetrated through { HEAD ~ skin } , and extends forwardly as soon as the needle enters the patients body , thus helping to protect the patient against accidental injury from the needle
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD 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