Patent ID: 6853861

Claim:
An implantable cardiac stimulating device comprising: a housing; a first electrode adapted to be positioned in a first ventricle of a heart; a second electrode adapted to be positioned in a second ventricle of a heart; a first pulse generator connected to said first electrode for delivering stimulation pulses via said first electrode to stimulate said first ventricle; a second pulse generator connected to said second electrode for delivering stimulation pulses via said second electrode to stimulate said second ventricle; a control circuit in said housing including a pulse delivery controller connected to said first and second pulse generators which controls delivery of stimulating pulses via said first and second electrodes within the same cardiac cycle with a time interval between the stimulation pulses respectively delivered via said first and second electrodes, and for varying said time interval; a first evoked response sensor for sensing at least one evoked response parameter to stimulation of said first ventricle; a second evoked response sensor for sensing at least one evoked response parameter to stimulation of the second ventricle; said control circuit including a comparator connected to said first and second evoked response sensors for comparing respective times of occurrence of the evoked response parameters respectively sensed by said first and second evoked response sensors and for identifying a time difference between said times of occurrence; and said control circuit controlling said pulse delivery controller to minimize said time difference.