Catheter tracking and endocardium representation generation
First Claim
1. A method for determining information about a location and orientation of a catheter in a patient'"'"'s heart, the method comprising:
- determining electrical signals as a function of relative position based on spatial information indicative of regions of different complex conductivity in the patient'"'"'s heart cavity and conductivity values;
causing current to flow between each of three or more sets of current-injecting electrode source/sink pairs on a catheter inserted into the patient'"'"'s heart;
measuring by multiple measuring electrodes located on the catheter, electrical signals in response to the current flow caused by each set of current injecting electrode source/sink pairs on the catheter;
determining the location and orientation of the catheter in the patient'"'"'s heart based on the electrical signals measured by the multiple measuring electrodes located on the catheter in response to the current flow caused by the current injecting electrode source/sink pairs on the catheter and thedetermined electrical signals based on the spatial information;
measuring, by at least some of the multiple measuring electrodes on the catheter, electrical signals indicative of cardiac electrical activity; and
determining information about electrical activity of the heart based on the measured electrical signals indicative of cardiac electrical activity and the determined location and orientation of the catheter in the patient'"'"'s heart;
wherein causing the current to flow comprises injecting the current at frequencies spaced from those corresponding to the cardiac electrical activity and the determining the location and orientation of the catheter comprises frequency processing the measured electrical signal responsive to the injected current to distinguish electrical signals responsive to the injected current from those corresponding to the cardiac electrical activity.
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Accused Products
Abstract
Methods and systems are disclosed for determining information about a position of an object within a distribution of materials having different complex conductivities. The method includes: (i) causing current to flow in the distribution; (ii) measuring an electrical signal at each of multiple locations in the distribution of materials in response to the current flow; (iii) providing spatial information about the distribution of materials with respect to a first reference frame, the spatial information indicative of regions of different complex conductivity in the distribution of materials; and (iv) determining the position of the object with respect to the spatial information about the distribution of materials based on measured electrical signals and the spatial information. In certain embodiments, the object is a catheter inserted into a patients heart cavity for cardiac mapping.
165 Citations
13 Claims
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1. A method for determining information about a location and orientation of a catheter in a patient'"'"'s heart, the method comprising:
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determining electrical signals as a function of relative position based on spatial information indicative of regions of different complex conductivity in the patient'"'"'s heart cavity and conductivity values; causing current to flow between each of three or more sets of current-injecting electrode source/sink pairs on a catheter inserted into the patient'"'"'s heart; measuring by multiple measuring electrodes located on the catheter, electrical signals in response to the current flow caused by each set of current injecting electrode source/sink pairs on the catheter; determining the location and orientation of the catheter in the patient'"'"'s heart based on the electrical signals measured by the multiple measuring electrodes located on the catheter in response to the current flow caused by the current injecting electrode source/sink pairs on the catheter and the determined electrical signals based on the spatial information; measuring, by at least some of the multiple measuring electrodes on the catheter, electrical signals indicative of cardiac electrical activity; and determining information about electrical activity of the heart based on the measured electrical signals indicative of cardiac electrical activity and the determined location and orientation of the catheter in the patient'"'"'s heart; wherein causing the current to flow comprises injecting the current at frequencies spaced from those corresponding to the cardiac electrical activity and the determining the location and orientation of the catheter comprises frequency processing the measured electrical signal responsive to the injected current to distinguish electrical signals responsive to the injected current from those corresponding to the cardiac electrical activity. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A system for determining information about a location and orientation of a catheter in a patient'"'"'s heart, the system comprising:
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a catheter configured to be inserted into the patient'"'"'s heart, the catheter including three or more sets of current-injecting electrodes and multiple measuring electrodes; electronics coupled to the three or more sets of current-injecting electrodes for causing current to flow by injecting current in the patient'"'"'s heart; electronics coupled to the measuring electrodes for measuring an electrical signal in response to the current flow and for measuring electrical signals indicative of cardiac electrical activity; and an electronic processor coupled to current causing and signal measuring electronics, wherein the electronic processor is configured to determine electrical signals as a function of relative position based on spatial information indicative of regions of different complex conductivity in the patient'"'"'s heart cavity and conductivity values; determine the location and orientation of the catheter in the patient'"'"'s heart based on the electrical signals measured by the multiple spatially distributed measuring electrodes located on the catheter in response to the current flow by injecting currents at frequencies spaced from those corresponding to the cardiac electrical activity caused by the current injecting electrode source/sink pairs on the catheter; and use electrical signals indicative of cardiac electrical activity measured by the electrodes on the catheter to determine information about electrical activity of the heart based on the measured electrical signals indicative of cardiac electrical activity and the determined location and orientation of the catheter in the patient'"'"'s heart; wherein the determining the location and orientation of the catheter comprises frequency processing the measured electrical signal responsive to the injected current to distinguish electrical signals responsive to the injected current from those corresponding to the cardiac electrical activity. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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Specification