Devices and methods for facilitating transvascular, minimally invasive and other “less invasive” surgical procedures generally include a sheath with an expandable balloon at the distal end, an inflation lumen for expanding the balloon, and a device passage lumen for allowing passage of one or more...http://www.google.ca/patents/US7534204?utm_source=gb-gplus-sharePatent US7534204 - Cardiac visualization devices and methods
