pay-per-view designation To exploit additional on-screen talent after buying World Championship Wrestling (WCW) in March 2001, the following year WWE began a brand extension that divided the roster between the two brands of WWE, namely Raw and SmackDown. Former WCW President and then Raw General Manager Eric Bischoff formally announced the creation of the chamber during the October 21 episode of Raw and scheduled the match to feature participants from the Raw brand roster at the Survivor Series in November 2002. The match was exclusive to the Raw brand for the first four matches and at joint-branded pay-per-view events, but upon the creation of the ECW brand in 2006 the match was instead promoted for the newly created brand at December to Dismember. Beginning in 2008, the match became exclusive to the No Way Out event and two Elimination Chamber matches were featured annually for two years among the three brands. In 2010, WWE replaced their No Way Out event with the self-titled Elimination Chamber, a new event which continued the tradition of its predecessor. From 2008 to 2014, the match had been featured in February events only. An Elimination Chamber event took place on May 31, 2015 exclusively on the WWE Network. After the second brand extension in 2016, it was announced that the brands would return to having separate events. In late 2016, it was announced that Elimination Chamber would return as a SmackDown-exclusive event in February 2017, but it switched to being Raw-exclusive in February 2018, which was the last brand-exclusive Elimination Chamber event, as following WrestleMania 34 that year, brand-exclusive pay-per-views were discontinued. Injuries Triple H suffered an injury during the 2002 Survivor Series match with swelling on the inside of his throat which put pressure on his esophagus and trachea. This was caused after Rob Van Dam performed the Five Star Frog Splash off the top of one of the chambers. Triple H also expressed concern that he might have broken his wrist and noted anything could have caused it. Sheamus reportedly suffered a concussion during the Raw Elimination Chamber match in 2010. Also in 2010, The Undertaker was involved in a pyrotechnics accident during his ring entrance. He was temporarily engulfed in flames on three occasions when the pyrotechnics were mistimed and his jacket briefly caught on fire. He suffered first and second-degree burns to his neck and chest and according to a WWE