  We consider wormhole geometries subject to a gravitational action consisting
of non-linear powers of the Ricci scalar. Specifically, wormhole throats are
studied in the case where Einstein gravity is supplemented with a Ricci-squared
and inverse Ricci term. In this modified theory it is found that static
wormhole throats respecting the weak energy condition can exist. The analysis
is done locally in the vicinity of the throat, which eliminates certain
restrictions on the models introduced by considering the global topology.
