Financial terms of the deal, announced Tuesday, weren't revealed.
The 23-year-old Galiardi played only 35 games last season because of wrist and forearm injuries. He finished with seven goals and eight assists. The Avalanche selected Galiardi in the second round of the 2007 draft.
Rissmiller, 32, played for five teams last season, including the Lake Erie of the American Hockey League. He was originally signed by the San Jose Sharks in June 2003 and has played in 192 NHL games.
I watched many times this year the series between the Russians and Canada in 1972, and he was a dominating player there. After I watched the tapes, I respect him a lot more because he turned the series around. He was the guy. In that time, he was the best in the world. It’s a big honor for me to tie him.
— Panthers forward Jaromir Jagr on scoring the 717th goal of his career to tie Phil Esposito for fifth on the NHL's all-time goals list after a 4-3 win vs. the Lightning on Sunday