Method and system for determining information of extrema during expansion and contraction cycles of an object
First Claim
1. A method for determining information of extrema during expansion and contraction cycles of an object, the method comprising:
- receiving time sampled information from a plurality of sensors distributed along a length of a flexible device so as to indicate the shape of the flexible device over time while the flexible device extends through a lumen of the object so as to conform to and resemble the shape of the lumen;
determining displacements over time of a selected point at a selected insertion length of the flexible device into the lumen of the object relative to a reference point using the time sampled information received from the plurality of sensors;
determining extrema time points during the expansion and contraction cycles of the object by identifying sign changes of the slope of the determined displacements of the point of the lumen over time; and
identifying extrema types during the expansion and contraction cycles of the object by using extrema type characteristics.
1 Assignment
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Accused Products
Abstract
A medical system provides navigation assistance to a surgeon for navigating a flexible medical device through linked passages of an anatomical structure to a target area. For tracking, navigation, and other purposes, information of extrema is determined during expansion and contraction cycles of an object by receiving time sampled information from sensors distributed along a length of a flexible device so as to indicate the shape of the device over time while the device extends through a lumen of the object so as to conform to and resemble the shape of the lumen, displacements over time of a selected point at a selected insertion length of the flexible device into the lumen of the object relative to a reference point are determined, extrema time points are determined by identifying sign changes of the slope of the determined displacements over time, and extrema types are determined using extrema type characteristics.
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Citations
42 Claims
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1. A method for determining information of extrema during expansion and contraction cycles of an object, the method comprising:
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receiving time sampled information from a plurality of sensors distributed along a length of a flexible device so as to indicate the shape of the flexible device over time while the flexible device extends through a lumen of the object so as to conform to and resemble the shape of the lumen; determining displacements over time of a selected point at a selected insertion length of the flexible device into the lumen of the object relative to a reference point using the time sampled information received from the plurality of sensors; determining extrema time points during the expansion and contraction cycles of the object by identifying sign changes of the slope of the determined displacements of the point of the lumen over time; and identifying extrema types during the expansion and contraction cycles of the object by using extrema type characteristics. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A system comprising:
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a flexible device including a plurality of sensors distributed along a length of the flexible device so as to indicate the shape of the flexible device as the flexible device extends through a lumen of an object so as to conform to and resemble the shape of the lumen; and one or more processors adapted to determine information of extrema during expansion and contraction cycles of the object by receiving time sampled information from the plurality of sensors, determine displacements over time of a selected point at a selected insertion length of the flexible device into the lumen of the object relative to a reference point using the time sampled information received from the plurality of sensors, determine the extrema time points during the expansion and contraction of the object over time by identifying changes in the sign of the slope of the determined displacements of the point over time, and identify extrema types during the expansion and contraction cycles of the object by using extrema type characteristics. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42)
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Specification