When {HEAD ~ a needle} is appropriately connected to {TAIL ~ a needle housing} having a side arm, the inventive probe can be inserted through the channel in the side arm and housing and into and through the needle to an appropriate position near the proximal end of the needle 
is appropriately connected to
When { HEAD ~ a needle } is appropriately connected to { TAIL ~ a needle housing } having a side arm , the inventive probe can be inserted through the channel in the side arm and housing and into and through the needle to an appropriate position near the proximal end of the needle
OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL REL 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH