Islanders acquire McAmmond from Sens
The 28-year-old Comrie has seven goals and 13 assists in 41 games for the Islanders (17-35), who have a league-low 40 points. The eight-year veteran is a free agent after this season.
Comrie returns to the Senators, whom he helped reach the Stanley Cup Finals in 2006-07.
Comrie recorded 12 goals and 13 assists in 41 games with Ottawa after being acquired from Phoenix on January 3.
In 503 games with Edmonton, Philadelphia, Phoenix, Ottawa and the Islanders, Comrie has registered 151 goals and 180 assists.
Campoli, 24, has six goals and 17 assists in 51 games. The fourth-year pro has 20 goals and 63 assists in 228 games with New York.
McAmmond, 35, has spent the past three seasons with the Senators. He has three goals and four assists in 44 games this campaign. The 16-year veteran has 176 goals and 246 assists in 916 games with seven different teams.
"We're excited that we are able to add another piece to our rebuilding plans while bringing in someone like Dean who will provide additional depth for our team," Islanders general manager Garth Snow said.