DYNAMIC ADAPTIVE RESPIRATION COMPENSATION WITH AUTOMATIC GAIN CONTROL
First Claim
1. A method for determining a compensated location of an electrode of a medical device within a body of a patient, comprising the steps of:
- (A) mean-adjusting patch electrode impedance data associated with body surface electrodes and electrode location data associated with said electrode;
(B) determining an acquired set of weights such that a linear combination of the product of the weights and mean-adjusted patch impedance data correspond to the mean-adjusted electrode location data;
(C) repeating steps (A) and (B) for a plurality of different time periods and producing a plurality of sets of weights, and updating a reference set of weights, based on a learning parameter, as each successive acquired sets of weights is determined in step (B);
(D) determining a compensation signal using the reference set of weights and patch electrode impedance data; and
(E) computing a compensated electrode location using an uncompensated electrode location and the compensation signal.
1 Assignment
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Accused Products
Abstract
A system for determining a location of an electrode of a medical device (e.g., a catheter) in a body of a patient includes a localization block for producing an uncompensated electrode location, a motion compensation block for producing a compensation signal (i.e., for respiration, cardiac, etc.), and a mechanism for subtracting the compensation signal from the uncompensated electrode location. The result is a corrected electrode location substantially free of respiration and cardiac artifacts. The motion compensation block includes a dynamic adaptation feature which accounts for changes in a patient'"'"'s respiration patterns as well as intentional movements of the medical device to different locations within the patient'"'"'s body. The system further includes an automatic compensation gain control which suppresses compensation when certain conditions, such as noise or sudden patch impedance changes, are detected.
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Citations
21 Claims
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1. A method for determining a compensated location of an electrode of a medical device within a body of a patient, comprising the steps of:
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(A) mean-adjusting patch electrode impedance data associated with body surface electrodes and electrode location data associated with said electrode; (B) determining an acquired set of weights such that a linear combination of the product of the weights and mean-adjusted patch impedance data correspond to the mean-adjusted electrode location data; (C) repeating steps (A) and (B) for a plurality of different time periods and producing a plurality of sets of weights, and updating a reference set of weights, based on a learning parameter, as each successive acquired sets of weights is determined in step (B); (D) determining a compensation signal using the reference set of weights and patch electrode impedance data; and (E) computing a compensated electrode location using an uncompensated electrode location and the compensation signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A system for determining a motion compensated location of an electrode of a medical device within a body of a patient, comprising:
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a main control unit including (i) a localization block configured to produce an uncompensated electrode location signal;
(ii) a compensation block configured to generate a compensation signal; and
(iii) a mechanism to subtract said compensation signal from said uncompensated location signal to output a compensated location signal;said compensation block being configured to (i) mean-adjust patch electrode impedance data associated with body surface electrodes and electrode location data associated with said electrode;
(ii) acquire a set of weights such that a linear combination of the product of said set of weights and said mean-adjusted patch impedance data correspond to said mean-adjusted electrode location data;
(iii) to further mean-adjust patch impedance and electrode location data for further time periods to produce a plurality of acquired sets of weights;
(iv) to update a reference set of weights, based on a learning parameter, for each successive acquired sets of weights; and
(v) to determine said compensation signal based on said reference set of weights and patch electrode impedance data. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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21. A method for determining a compensated location of magnetic field sensor of a medical device within a body of a patient, comprising the steps of:
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(A) mean-adjusting patch electrode impedance data associated with body surface electrodes and magnetic sensor location data associated with said magnetic field sensor; (B) determining an acquired set of weights such that a linear combination of the product of the weights and mean-adjusted patch impedance data correspond to the mean-adjusted magnetic sensor location data; (C) repeating steps (A) and (B) for a plurality of different time periods and producing a plurality of sets of weights, and updating a reference set of weights, based on a learning parameter, as each successive acquired sets of weights is determined in step (B); (D) determining a compensation signal using the reference set of weights and patch electrode impedance data; and (E) computing a compensated magnetic sensor location using an uncompensated magnetic sensor location and the compensation signal.
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Specification