The 27-year-old Kobasew had one assist in seven games for the Bruins this season after scoring 21 goals and adding 21 assists with 56 penalty minutes in 2008-09. He also had three goals and three assists in 11 postseason contests.
A former first-round draft choice of the Calgary Flames (No. 14 in 2001), Kobasew has 78 goals and 77 assists in 368 NHL games. He has scored 20 or more goals three times in his career.
Weller, 28, appeared in five games for the Houston Aeros in the American Hockey League this season. The 6-foot-4, 220-pound Calgary native has four goals, 10 assists and 127 penalty minutes in 95 NHL games. He was a fifth-round draft choice of the St. Louis Blues in 2000.
Fallstrom celebrated his 19th birthday on Sept. 15. The 6-foot-2, 195-pound Swede was selected by the Wild in the fourth round of the 2009 Entry Draft.
With only two points this season, the Wild currently sit in last place in the Western Conference. They've scored only 15 goals in seven games.