{HEAD ~ The present invention} relates to medical devices and {TAIL ~ methods} for accessing an anatomical space of the body 
relates to
{ HEAD ~ The present invention } relates to medical devices and { TAIL ~ methods } for accessing an anatomical space of the body
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH