A crimping device used with a medical device can include at least one force-applying surface configured to compress the medical device by applying a force to a surface of the medical device. The crimping device also includes at least one protruding element extending from the force-applying surface and arranged to least partially extend into one of the openings defined by frame struts while the medical device is being crimped. The extension of the at least one protruding element at least partially into one of the openings prevents at least a portion of the soft layer of the medical device from protruding between struts of the outer frame of the medical device while the device is being crimped.
