Dynamic adaptive respiration compensation with automatic gain control
First Claim
1. An apparatus for determining a motion compensated location of an electrode of a medical device within a body of a patient, comprising:
- a computer system including (i) a localization block configured to produce an uncompensated electrode location;
(ii) a motion compensation block configured to generate a compensation signal, said computer system being configured to subtract said compensation signal from said uncompensated electrode location to output a motion compensated electrode location;
said motion compensation block being configured to;
(i) mean-adjust patch electrode impedance data associated with body surface electrodes and to mean-adjust electrode location data associated with said electrode;
(ii) acquire a set of weights by equating the product of said set of weights and said mean-adjusted patch impedance data with said mean-adjusted electrode location data;
(iii) further mean-adjust patch impedance and electrode location data for further time periods to produce a plurality of successive acquired sets of weights;
(iv) for each successive acquired sets of weights update a reference set of weights, based on a learning parameter, wherein said learning parameter is determined in accordance with a distance between the successive acquired sets of weights; and
(v) generate said compensation signal based on said updated reference set of weights and patch electrode impedance data.
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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.
25 Citations
15 Claims
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1. An apparatus 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 computer system including (i) a localization block configured to produce an uncompensated electrode location;
(ii) a motion compensation block configured to generate a compensation signal, said computer system being configured to subtract said compensation signal from said uncompensated electrode location to output a motion compensated electrode location;said motion compensation block being configured to;
(i) mean-adjust patch electrode impedance data associated with body surface electrodes and to mean-adjust electrode location data associated with said electrode;
(ii) acquire a set of weights by equating the product of said set of weights and said mean-adjusted patch impedance data with said mean-adjusted electrode location data;
(iii) further mean-adjust patch impedance and electrode location data for further time periods to produce a plurality of successive acquired sets of weights;
(iv) for each successive acquired sets of weights update a reference set of weights, based on a learning parameter, wherein said learning parameter is determined in accordance with a distance between the successive acquired sets of weights; and
(v) generate said compensation signal based on said updated reference set of weights and patch electrode impedance data.
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2. An apparatus 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 computer system including (i) a localization block configured to produce an uncompensated electrode location;
(ii) a motion compensation block configured to generate a compensation signal, said computer system being configured to subtract said compensation signal from said uncompensated electrode location to output a motion compensated electrode location;said motion compensation block being configured to;
(i) mean-adjust patch electrode impedance data associated with body surface electrodes and to mean-adjust 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) further mean-adjust patch impedance and electrode location data for further time periods to produce a plurality of successive acquired sets of weights;
(iv) for each successive acquired sets of weights update a reference set of weights, based on a learning parameter, wherein said learning parameter is determined in accordance with a distance between the successive acquired sets of weights; and
(v) generate said compensation signal based on said updated reference set of weights and patch electrode impedance data. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification