Medical devices and methods for making and using medical devices are disclosed. An example medical device may include a catheter shaft. An expandable balloon may be coupled to the catheter shaft. The balloon may be capable of shifting between an unexpanded configuration and an expanded configuration. Electrode assemblies with electrical pathways may be coupled to the balloon. The electrical pathways may be capable of shifting between a serpentine configuration when the balloon is unexpanded to a straighter configuration when the balloon is expanded.