As far as I remember, for spouses, they will only be inadmissible on medical grounds if they pose a threat to health and public safety, which I doubt would be applicable in your case.
Here's the links I found:
CIC operation manual.
In canada applicants
look at page 23, section 5.32
http://www.cic.gc.ca/english/resources/manuals/ip/ip08-eng.pdf
and for external applicants:
look at page 17, sections 5.19, and 5.20
http://www.cic.gc.ca/english/resources/manuals/op/op02-eng.pdf
and here's an article.
http://www.cnmag.ca/issue-11/228-immigration-supreme-court-ruling-on-medical-admissibility-to-canada-n06
Hope this helps.