sternotrypesis

ster·no·try·pe·sis

(ster'nō-trī-pē'sis),
Trephining of the sternum.
[sterno- + G. trypēsis, a boring]

sternotrypesis

(stĕr″nō-trī-pē′sĭs) [″ + trypesis, a boring]
Surgical perforation of the sternum.