Canada had its first National Jamboree in 1949. It had one jamboree in the 1950s and one in the 1960s, and beginning 1977 it had a jamboree every four years through 2001, when it was changed to every 6 years to avoid volunteer burnout.
Except for the United States, Canada has been the most prolific country in issuing medical staff memorabilia. Its first issue was with the 1983 World Jamboree, and every National Jamboree since then has also seen medical items. The Canadian Jamboree medical staff generally goes under the term MUSH, although I am not completely certain what that stands for.
1985 was the first year that the Canadian National Jamborees had medical staff items. It had the first square MUSH patch. It also had the round patch on the right. This was the only year to date that has had this style of medical patch.
This patch was the first jamboree in which the MedVents were involved. They would become much more involved at future jamborees.
In 2013 the Canada National Jamboree badge returned to the traditional MUSH. There were again MedVents, but this year they all used the same badge rather than one for each group. The image on the right was this badge.
In addition to having countrywide National Jamborees, Canada has had many Provincial Jamborees. I am not sure how many there have been or when they first started; I can find evidence of one held as early as 1974 in Quebec. These are the medical issues I can find from these Provincial Jamborees.
1998 -- Prince Edward Island -- Want
1999 --BC/Yukon Jamboree -- Have
1999 -- Saskatchewan & Manitoba -- Have
1999 -- Pacific Jamboree -- Have
1999 -- Alberta -- Have
2003 -- Pacific Jamboree -- Have
2005 -- Quebec -- Have
2005 -- Scouting Brotherhood Jamboree (formerly Alberta Jamboree) -- Have
2007 --Pacific Jamboree -- Have
2011 --Pacific Jamboree -- Have
2015 --Pacific Jamboree -- Have