Patent ID: 7857767

Claim:
A lumen-traveling device, comprising: a motion-arresting portion; a fluid-contacting portion configured to contact fluid within the body lumen and to at least intermittently permit flow of fluid through the body lumen; a propelling mechanism configured to produce movement of the lumen-traveling device through a body lumen in which the lumen-traveling device is deployed; motion control circuitry carried at least in part by said lumen-traveling device and configured to control the propelling mechanism to control movement of the lumen-traveling device through the body lumen; a sensor configured to detect a condition of interest in the body lumen and to generate a sense signal indicating detection of the condition of interest; response initiation circuitry operatively connected to the sensor and configured to generate a response initiation signal upon receipt of the sense signal indicating detection of the condition of interest in the body lumen; and an active portion operatively connected to the response initiation circuitry and configured to produce a response upon receipt of the response initiation signal.