A safety balloon catheter includes a flexible, multi-lumen balloon catheter having a hollow stretch valve. The catheter has a balloon, a hollow inflation lumen extending to the balloon interior and conveying inflation fluid to and from the balloon interior, a hollow second lumen, and a balloon drainage port fluidically connecting the balloon interior to the second lumen. The valve has distal and proximal portions, is shaped to permit a fluid to pass therethrough, and is positioned in the second lumen such that, in a steady state, the valve prevents the inflation fluid from passing through the drainage port, and, in a catheter-stretched state, the distal portion slides within the second lumen permitting inflation fluid to pass through the drainage port and into the second lumen and the second lumen wall at the proximal portion holds the proximal portion steady within the second lumen as the distal portion slides therein.
