In {TAIL ~ the event} of mechanical failure, {HEAD ~ pre implantation heart function} is not impeded 
In
In { TAIL ~ the event } of mechanical failure , { HEAD ~ pre implantation heart function } is not impeded
REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH