Patent ID: 8798740

Claim:
A leadless intra-cardiac medical device (LIMD), comprising: a housing configured to be implanted entirely within a single local chamber of the heart, the local chamber having local wall tissue that constitutes part of a conduction network of the local chamber; the housing including a stabilizer arm having a distal end that extends outward from the housing, the stabilizer arm having a pusher cup located at the distal end, the pusher cup configure to receive a pusher tool, the stabilizer arm having a core structure that is torque and compression resistant such that when the pusher tool is rotated or moved longitudinally, the stabilizer arm conveys rotation and longitudinal force from the pusher tool to the housing; a base on the housing, the base configured to be secured to tissue of interest that separates the local chamber from an adjacent chamber, the adjacent chamber having distal wall tissue, with respect to the local chamber, that constitutes part of a conduction network of the adjacent chamber; a first electrode provided on the base and extending outward such that, when the device is implanted in the local chamber, the first electrode is configured to engage wall tissue at a distal activation site within the conduction network of the adjacent chamber; an extension arm provided on the housing and extending outward from the housing; a second electrode provided on the extension arm and located such that, when the extension arm is positioned in the local chamber, the second electrode is configured to engage wall tissue at a local activation site within the conduction network of the local chamber; and a controller within the housing to cause stimulus pulses to be delivered, in a synchronous manner, through the first and second electrodes to the distal and local activation sites, respectively, such that stimulus pulses delivered at the distal activation site are timed to cause contraction of the adjacent chamber in a predetermined relation to contraction of the local chamber.