Portable regenerator
From Memory Alpha, the free Star Trek reference
A portable regenerator is a device that allows Borg regeneration without the use of an alcove.
In 2376, when it seemed Icheb would be returning to his parents, Seven of Nine provided Leucon with a portable regenerator and an adapted neural transceiver, so that Icheb could regenerate on the Brunali homeworld. (VOY: "Child's Play")
The device seen here was a redress of the interphasic Cloaking device as seen in the TNG episode "The Pegasus"
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