Regenerative shield

Regenerative shields were an advanced form of deflector technology utilized by both the Numiri culture of the Delta Quadrant, and Starfleet in the 24th century.

In 2371, when the USS Voyager was engaged in combat with two Numiri patrol ships, Commander Chakotay utilized an old Maquis maneuver, wherein Voyager feigned distress to lure the enemy vessels into close proximity. When one of the patrol vessels attempted to lock a tractor beam onto Voyager, Chakotay ordered phasers fired at the vessels' navigational deflectors, successfully penetrating their regenerative shields and disabling both ships. 

The experimental vessel USS Prometheus (Prometheus class), developed by Starfleet in 2374, was equipped with regenerative shielding, ablative hull armor, and multi-vector assault mode as part of its primary battle systems. In that year, the regenerative shielding was utilized in battle with a group of Romulan Warbirds. 

Apocrypha
According to the Voyager novel Seven of Nine, the Borg had assimilated regenerative shield technology from an insectoid race known as the Tuktak, who used it to protect their ships. However, it proved impractical for Borg vessels, especially the very massive Borg cubes, so the Collective modified the technology for drones' personal protection instead.''

Regenerativer Schutzschild