Schremp was a first-round pick in the 2004 Entry Draft by Edmonton. He has 10 goals and 22 points this season for the Islanders and is a restricted free agent at the end of this season. The Thrashers have also added Radek Dvorak from Florida in a trade and signed defenseman Mark Stuart to a three-year contract extension Monday.
Carson had no points in 13 games for the Hurricanes this season. He was a fourth-round pick by Carolina in the 2004 Entry Draft.
"We have watched Brett a lot this year," interim Flames general manager Jay Feaster told the team's website. "He's a big guy who moves the puck very well."
Tampa Bay traded Dan Ellis to Anaheim for McElhinney, but he never played for the Lightning. McElhinney was 6-9-1 with a 3.43 goals against average and an .890 save percentage for the Ducks.