The move on Saturday was made after defenceman Alexander Sulzer sustained a lower-body injury in Friday's 2-0 loss at Florida.
Ruhwedel, 23, has played in seven games for the Sabres this season. He hasn't recorded a point but has a team-best plus-3 rating.
The Sabres signed Ruhwedel out of UMass-Lowell in April 2013.
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