Modulation and analysis of cerebral perfusion in epilepsy and other neurological disorders
First Claim
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1. A method for responding to a change in cerebral perfusion at a target site in a human patient, comprising:
- calculating a variable baseline value for cerebral perfusion by sequentially measuring a first set of signals indicative of cerebral perfusion level from at least one sensor implanted in the body of the patient;
averaging the first set of cerebral perfusion measurements to obtain a variable baseline value;
setting a threshold value of cerebral perfusion which threshold value comprises a fixed relationship between a predetermined value and the variable baseline value;
measuring a second set of at least one cerebral perfusion measurement;
comparing the second set to the threshold value and if the second set is not greater than the threshold value, updating the variable baseline value by the relationship between the predetermined value and the variable baseline value.
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Abstract
A system including an implantable neurostimulator device capable of modulating cerebral blood flow to treat epilepsy and other neurological disorders. In one embodiment, the system is capable of modulating cerebral blood flow (also referred to as cerebral perfusion) in response to measurements and other observed conditions. Perfusion may be increased or decreased by systems and methods according to the invention as clinically required.
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Citations
32 Claims
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1. A method for responding to a change in cerebral perfusion at a target site in a human patient, comprising:
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calculating a variable baseline value for cerebral perfusion by sequentially measuring a first set of signals indicative of cerebral perfusion level from at least one sensor implanted in the body of the patient; averaging the first set of cerebral perfusion measurements to obtain a variable baseline value; setting a threshold value of cerebral perfusion which threshold value comprises a fixed relationship between a predetermined value and the variable baseline value; measuring a second set of at least one cerebral perfusion measurement; comparing the second set to the threshold value and if the second set is not greater than the threshold value, updating the variable baseline value by the relationship between the predetermined value and the variable baseline value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for responding to a change in cerebral perfusion in a human patient, comprising:
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obtaining a first set of a plurality of measurements of cerebral perfusion measurements from at least one sensor implanted in a human patient; obtaining a second set of at least one measurement of cerebral perfusion; taking an average of the measurements in the first set to establish a baseline level; setting a threshold to be a value having a fixed relationship with the baseline level; comparing the second set of at least one measurement of cerebral perfusion to the threshold; if the second set of at least one measurement of cerebral perfusion is greater than the threshold, then taking an action in response to the change in cerebral perfusion; if the second set of at least one measurement of cerebral perfusion is not greater than the threshold, then recalculating the baseline level to be the average of the at least one measurement in the second set and a subset of the plurality of measurements in the first set. - View Dependent Claims (17, 18, 19, 20, 21)
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22. A method for responding to a change in cerebral perfusion in a human patient, comprising:
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obtaining a first set of a plurality of measurements of cerebral perfusion measurements from at least one sensor implanted in a human patient; obtaining a second set of at least one measurement of cerebral perfusion; taking an average of the measurements in the first set to establish a baseline level; setting a threshold to be a fixed relationship from the baseline level; comparing the second set of at least one measurement of cerebral perfusion to the threshold; if the second set of at least one measurement of cerebral perfusion is less than the threshold, then taking an action in response to the change in cerebral perfusion; if the second set of at least one measurement of cerebral perfusion is not less than the threshold, then recalculating the baseline level to be the average of the at least one measurement in the second set and a subset of the plurality of measurements in the first set. - View Dependent Claims (23, 24, 25, 26, 27)
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28. A method for responding to a change in cerebral perfusion in a human patient, comprising:
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obtaining a first set of a plurality of measurements of cerebral perfusion measurements from at least one sensor implanted in a human patient; obtaining a second set of at least one measurement of cerebral perfusion; taking an average of the measurements in the first set to establish a baseline level; setting a first threshold to be a value having a first fixed relationship with the baseline level and a second threshold to be a value having a second fixed relationship with the baseline level; comparing the second set of at least one measurement of cerebral perfusion to the first threshold; if the second set of at least one measurement of cerebral perfusion is greater than the first threshold, then taking a first action in response to the change in cerebral perfusion; comparing the second set of at least one measurement of cerebral perfusion to the second threshold; if the second set of at least one measurement of cerebral perfusion is less than the second threshold, then taking a second action in response to the change in cerebral perfusion; if the second set of at least one measurement of cerebral perfusion is not greater than the first threshold and is not less than the second threshold, then recalculating the baseline level to be the average of the at least one measurement in the second set and a subset of the plurality of measurements in the first set. - View Dependent Claims (29, 30, 31, 32)
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Specification