abaptiston

abaptiston

 [a-bap-tis´ton]
a saw used to remove a circular area of the skull, constructed so as to avoid slippage with damage to the brain.

abaptiston

(ā″bap-tis′tŏn) [Gr. (trypanon) abaptiston, undipped (trepan)]
Trephine that cannot slip and injure the brain.