Thrashers claim Rob Schremp
McElhinney didn't see any action with the Lightning, who acquired him in a trade with Anaheim last week.
In 21 games with the Ducks this season, he went 6-9-1 with a .890 save percentage and 3.43 goals-against average.
Carson has split time this season between the Hurricanes and Charlotte of the AHL. In 72 career NHL games, Carson has two goals, 10 assists and 20 penalty minutes.
The defenseman is no stranger to his new city, having played for the Western Hockey League's Calgary Hitmen from 2002 to 2006. Carson was chosen by Carolina in the fourth round of the 2004 draft.
Information from ESPN.com's Pierre LeBrun and The Associated Press was used in this report.
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2011 NHL TRADE DEADLINE
Our gurus recap the 2011 trade deadline: