Determining a size of a representation of a tracked member
First Claim
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1. A method of determining a position of an instrument in a patient, comprising:
- moving at least a first position element and a second position element with the instrument into a volume of the patient;
determining a position of the instrument with only a position sensing system, including;
providing a set of axis generation electrodes on an exterior surface of the volume establishing an axis and a conductive path therebetween; and
injecting a current into the volume between the set of electrodes and generating a voltage gradient between the set of electrodes;
evaluating an electrical property with the first and second position elements mounted on the instrument;
determining a position of the first and second position elements within the volume based on the evaluated electrical property;
determining a scalar distance between the first position element and the second position element on the instrument;
evaluating the determined position of the first and second position elements based on the scalar distance to correct for a distortion of the injected current between the set of axis generation electrodes in the patient to determine a corrected position determination; and
displaying a graphical representation of the corrected determined position of the first and second position elements.
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Abstract
An volume of a patient can be mapped with a system operable to identify a plurality of locations and save a plurality of locations of a mapping instrument. The mapping instrument can include one or more electrodes that can sense a voltage that can be correlated to a three dimensional location of the electrode at the time of the sensing or measurement. Therefore, a map of a volume can be determined based upon the sensing of the plurality of points without the use of other imaging devices. An implantable medical device can then be navigated relative to the mapping data.
280 Citations
24 Claims
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1. A method of determining a position of an instrument in a patient, comprising:
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moving at least a first position element and a second position element with the instrument into a volume of the patient; determining a position of the instrument with only a position sensing system, including; providing a set of axis generation electrodes on an exterior surface of the volume establishing an axis and a conductive path therebetween; and injecting a current into the volume between the set of electrodes and generating a voltage gradient between the set of electrodes; evaluating an electrical property with the first and second position elements mounted on the instrument; determining a position of the first and second position elements within the volume based on the evaluated electrical property; determining a scalar distance between the first position element and the second position element on the instrument; evaluating the determined position of the first and second position elements based on the scalar distance to correct for a distortion of the injected current between the set of axis generation electrodes in the patient to determine a corrected position determination; and displaying a graphical representation of the corrected determined position of the first and second position elements. - View Dependent Claims (2, 3, 4, 5, 6, 7, 10)
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8. A method of determining a position of an instrument in a patient, comprising:
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determining a position of an instrument having at least a first position element and a second position element with only a position sensing system within the patient, including; providing a set of axis generation electrodes on an exterior surface of the volume establishing an axis and a conductive path therebetween, wherein providing the set of axis generation electrodes includes providing at least three sets of axis generation electrodes injecting a separate axis current into the volume between each of the at least three set of axis generation electrodes; and injecting a current into the volume between the set of electrodes and generating a voltage gradient between the set of electrodes; evaluating an electrical property with the first and second position elements mounted on the instrument; determining a position of the first and second position elements within the patient based on the evaluated electrical property; determining a scalar distance between the first position element and the second position element on the instrument; applying the scalar distance to a position of the first electrode relative to the second electrode in each of the three axes, wherein applying the scalar distance to a position of the first electrode relative to the second electrode in each of the three axes, includes; determining a correction vector in three dimensions between the first position element and the second position element; determining a scaling factor rnx along the x-axis based on the correction vector and the scalar distance; determining a scaling factor rny along the y-axis based on the correction vector and the scalar distance; and determining a scaling factor rnz, along the z-axis based on the correction vector and the scalar distance; evaluating the determined position of the first and second position elements based on the scalar distance to correct for a distortion of the injected current between the set of axis generation electrodes in the patient to determine a corrected position determination, wherein evaluating the determined position includes calculating a position of the first position element relative to the second position element based on the determined scaling factors rnx, rny, and rnz; and displaying a graphical representation of the corrected determined position of the first and second position elements.
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9. A method of determining a position of an instrument in a patient, comprising:
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moving at least a first position element and a second position element with the instrument into a volume of the patient; determining a position of the instrument with only a position sensing system, including; providing a set of axis generation electrodes on an exterior surface of the volume establishing an axis and a conductive path therebetween; and injecting a current into the volume between the set of electrodes and generating a voltage gradient between the set of electrodes; evaluating an electrical property with the first and second position elements mounted on the instrument; determining a position of the first and second position elements within the volume based on the evaluated electrical property; determining a scalar distance between the first position element and the second position element on the instrument, including; determining an initial position of the first position element; determining an initial position of the second position element; and determining a distance between the first position element and the second position element based on the determined initial position of the first position element and the determined initial position of the second position element; evaluating the determined position of the first and second position elements based on the scalar distance to correct for a distortion of the injected current between the set of axis generation electrodes in the patient to determine a corrected position determination; determining a three dimensional position of the first position element relative to the second position element; determining a correction vector based on the determined scalar distance and the determined three dimensional position of the first position element relative to the second position element, wherein the corrected position of first position element and the second position element includes correcting the determined position of the first position element relative to the second position element based on the correction vector; displaying a graphical representation of the corrected determined position of the first and second position elements.
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11. A method of determining a position of an instrument in a patient, comprising:
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moving at least a first position element and a second position element with the instrument into a heart of the patient; determining a scalar distance between the first position element and the second position element on the instrument; determining a position of the instrument with only a position sensing system, including; providing a three sets of axis generation electrodes on an exterior surface of the volume establishing three axes and a three conductive paths therebetween; and injecting a current into the volume between each of the three sets of electrodes and generating a voltage gradient between each of the three sets of electrodes; evaluating an electrical property with the first and second position elements mounted on the instrument to determine an initial position of both the first position element and the second position element; determining a corrected position of the second position element relative to the first position element, including; determining a correction vector direction between the first position element and the second position element in each of the three axes; determining three scaling factors, one scaling factor for each of the three axes based on the determined scalar dimension and the determined correction vector calculating the position of the second position element based on the scaling factors relative to the determined position of the first position element to correct for a distortion of the injected current between the three sets of axis generation electrodes in the patient; and displaying a graphical representation of the determined corrected position of the first and second position elements. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A system to determine a position of an instrument in a patient, comprising:
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an instrument operable to be positioned into a volume of the patient having at least a first position element and a second position element; a position sensing system, including; a set of axis generation electrodes on an exterior surface of the volume establishing an axis and a conductive path therebetween; and a driver operable to inject a current into the volume between the set of axis generation electrodes and generating a voltage gradient between the set of axis generation electrodes; a processor operable to execute instructions to evaluate an electrical property measured with the first and second position elements mounted on the instrument to determine a sensed position of the first and second position elements within the volume based on the evaluated electrical property; the processor further operable to execute instructions to evaluate the sensed position of the first and second position elements based on a scalar distance between the first position element and the second position element to correct for a distortion of the injected current axis in the patient to determine a corrected position determination; and a display device to display a graphical representation of the corrected determined position of the first and second position elements. - View Dependent Claims (19, 20, 21, 22, 23, 24)
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Specification