A method for performing an in-vivo calibration of a blood pressure sensor that is associated with a balloon of an in-vivo balloon system, the sensor and balloon being associated such that the sensor is in-vivo when the balloon is in-vivo. The balloon is inflated so that a gas pressure in the balloon...http://www.google.com.au/patents/US8133184?utm_source=gb-gplus-sharePatent US8133184 - Calibration of in vivo blood pressure sensors