CARDIAC RESYNCHRONIZATION SYSTEM EMPLOYING MECHANICAL MEASUREMENT OF CARDIAC WALLS
First Claim
1. A method comprising:
- sensing motion at a first heart wall location to produce a first signal;
sensing motion at a second heart wall location to produce a second signal;
using information from the first and second signals to determine at least one control parameter for a stimulation pulse to spatially coordinate a heart contraction; and
applying the stimulation pulse or changing at least one control parameter of the stimulation pulse to spatially coordinate the heart contraction.
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Abstract
Methods and devices are disclosed for employing mechanical measurements to synchronize contractions of ventricular wall locations. Accelerometers that may be placed within electrode leads are positioned at ventricular wall locations, such as the left ventricle free wall, right ventricle free wall, and the anterior wall/septum wall. The accelerometers produce signals in response to the motion of the ventricular wall locations. A processor may then compare the signals to determine a difference in the synchronization of the ventricular wall location contractions. The difference in synchronization can be determined in various ways such as computing a phase difference and/or amplitude difference between the accelerometer signals. One or more stimulation pulses may be provided per cardiac cycle to resynchronize the contractions as measured by the accelerometers to thereby constantly and automatically optimize the cardiac resynchronization therapy.
58 Citations
21 Claims
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1. A method comprising:
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sensing motion at a first heart wall location to produce a first signal;
sensing motion at a second heart wall location to produce a second signal;
using information from the first and second signals to determine at least one control parameter for a stimulation pulse to spatially coordinate a heart contraction; and
applying the stimulation pulse or changing at least one control parameter of the stimulation pulse to spatially coordinate the heart contraction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An apparatus comprising:
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means for sensing motion at a first heart wall location to produce a first signal;
means for sensing motion at a second heart wall location to produce a second signal;
means for using information from the first and second signals to determine at least one control parameter for a stimulation pulse to spatially coordinate a heart contraction; and
means for applying the stimulation pulse or changing at least one control parameter of the stimulation pulse to spatially coordinate the heart contraction. - View Dependent Claims (10, 11)
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12. An apparatus comprising:
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a first motion sensor, configured to be located at a first heart wall location;
a second motion sensor, configured to be located at a second heart wall location;
a processor, coupled to the first and second motion sensors, the processor configured to use information from the first and second signals to determine at least one control parameter for a stimulation pulse to spatially coordinate a heart contraction; and
an output circuit, configured to apply or change at least one control parameter to deliver a stimulation pulse to spatially coordinate the heart contraction. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification