Wikipedia states: "Obsidian is used by some surgeons for scalpel blades, although this is not approved by the US Food and Drug Administration (FDA) for use on humans." - probably OK to use on archaeologists, though...

Crabtree is well known for his work in lithic technology, and this is an interesting development. The real question is the type of steel used in the conventional scalpels - 420HC? D2? 154CM?

Come to think about it, the Aztecs used obsidian extensively in their cardiac work and there is no reported development of scar tissue in that endeavor.