O'Brien, 27, had been placed on waivers by the Canucks this week. He's earning $1.6 million this season and will be an unrestricted free agent on July 1.
Parent, 23, is earning $850,000 this season and has another year on his deal, which will pay him $1 million in 2011-12.
The Canucks, after acquiring him from the Predators, placed him on waivers.
Andersson, 29, played in the KHL last season. Gendur, 23, played in the ECHL.
Pierre LeBrun covers the NHL for ESPN.com.