Cardiac resynchronization system employing mechanical measurement of cardiac walls
First Claim
1. A method comprising:
- sensing motion of a heart contraction at a first heart to produce a first signal;
sensing motion of the heart contraction at a second heart wall location to produce a second signal;
comparing the first signal to the second signal to detect a difference in synchronization of the first heart wall location with respect to the second heart wall location; and
iteratively adjusting a control parameter of a stimulation pulse to reduce the difference in synchronization.
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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.
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Citations
20 Claims
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1. A method comprising:
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sensing motion of a heart contraction at a first heart to produce a first signal; sensing motion of the heart contraction at a second heart wall location to produce a second signal; comparing the first signal to the second signal to detect a difference in synchronization of the first heart wall location with respect to the second heart wall location; and iteratively adjusting a control parameter of a stimulation pulse to reduce the difference in synchronization. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A machine-readable storage medium comprising instructions, which when executed by a machine, cause the machine to:
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sense motion of a heart contraction at a first heart wall location to produce a first signal; sense motion of the heart contraction at a second heart wall location to produce a second signal; compare the first signal to the second signal to detect a difference in synchronization of the first heart wall location with respect to the second heart wall location; and iteratively adjust a control parameter of a stimulation pulse to reduce the difference in synchronization. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. An apparatus comprising:
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a first motion sensor located at a first heart wall location and configured to produce a first signal; a second motion sensor located at a second heart wall location and configured to produce a second signal; a processor, coupled to the first and second motion sensors, the processor configured to; compare the first signal to the second signal to detect a difference in synchronization of the first heart wall location with respect to the second heart watt location; and iteratively adjust a control parameter of a stimulation pulse to reduce the difference in synchronization. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification