Volume Sensing
First Claim
1. A method for use with a lead having at least first and second electrodes, and for use with circuitry having means for measuring impedance between the at least first and second electrodes at least two distinct frequency bands, the lead initially being sterile and contained within a sterile wrapper, the method comprising the steps of:
- removing the lead from the sterile wrapper;
implanting the lead within an organ; and
connecting the lead to the circuitry.
2 Assignments
0 Petitions
Accused Products
Abstract
Each sensor in one or more pairs of sensors is associated with a particular tissue, for example a first tissue location and a second tissue location respectively. Tissue at a particular tissue location may be solid, for example, muscle tissue, fat tissue, etc., or fluid, for example, blood, fluids associated with edema, etc. The area between the two tissue locations associated with a pair of sensors may comprise solid tissue, fluid tissue, an empty chamber, or combinations thereof. For each pair of sensors in the at least one pair of sensors, a first impedance measurement between the pair of sensors and associated with a first frequency is determined. For each pair of sensors in the at least one pair of sensors, a second impedance measurement between the pair of sensors and associated with a second frequency is determined. A comparison of a ratio of the first impedance measurement at a point in time to the second impedance measurement at a corresponding point in time may be made to determine a volume-related value associated with an area located between the first tissue location and the second tissue location.
26 Citations
37 Claims
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1. A method for use with a lead having at least first and second electrodes, and for use with circuitry having means for measuring impedance between the at least first and second electrodes at least two distinct frequency bands, the lead initially being sterile and contained within a sterile wrapper, the method comprising the steps of:
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removing the lead from the sterile wrapper; implanting the lead within an organ; and connecting the lead to the circuitry. - View Dependent Claims (2, 3)
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4. A method for use with a lead having at least first and second electrodes, the lead disposed within an organ, the lead connected to first circuitry lacking means for measuring impedance between the at least first and second electrodes at least two distinct frequency bands, the method comprising the steps of:
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disconnecting the lead from the first circuitry, and connecting the lead to second circuitry, the second circuitry having means for measuring impedance between the at least first and second electrodes - View Dependent Claims (5, 6)
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7. A method for use with a lead having at least first and second electrodes, the lead implanted within an organ, and for use with circuitry having means for measuring impedance between the at least first and second electrodes, the method comprising the steps of:
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measuring impedance at the at least two distinct frequency bands at the first and second electrodes, and applying a function to the sensed impedances, thereby arriving at an indication of the liquid volume of the organ. - View Dependent Claims (8)
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9. A system comprising:
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a lead having at least first and second electrodes; circuitry having means for measuring impedance between the at least first and second electrodes; the lead being sterile and contained within a sterile wrapper. - View Dependent Claims (10, 24)
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11. A system comprising:
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a lead having at least first and second electrodes; circuitry having means for measuring impedance between the at least first and second electrodes; the lead implanted within an organ of a living subject and connected with the circuitry. - View Dependent Claims (12, 13)
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14. A method comprising:
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associating each sensor in at least one pair of sensors with a respective first tissue location and a respective second tissue location; and for each pair of sensors in the at least one pair of sensors; determining at a first point in time a first impedance measurement associated with a first frequency between the at least one pair of sensors; determining at a second point in time a second impedance measurement associated with a second frequency between the at least one pair of sensors; and comparing a ratio of the first impedance measurement to the second impedance measurement to determine a volume-related value associated with an area located between the first tissue location and the second tissue location. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 33)
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25. A lead device, comprising:
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at least one pair of sensors capable of association with a respective first tissue location and a respective second tissue location; and a logic module to; for each pair of sensors in the at least one pair of sensors; determine at a first point in time a first impedance measurement associated with a first frequency between the at least one pair of sensors; determine at a second point in time a second impedance measurement associated with a second frequency between the at least one pair of sensors; and compare a ratio of the first impedance measurement to the second impedance measurement to determine a volume-related value associated with an area located between the first tissue location and the second tissue location. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32)
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34. A system comprising:
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a lead device, having at least one pair of sensors capable of association with a respective first tissue location and a respective second tissue location; a logic module to; for each pair of sensors in the at least one pair of sensors; determine at a first point in time a first impedance measurement associated with a first frequency between the at least one pair of sensors; determine at a second point in time a second impedance measurement associated with a second frequency between the at least one pair of sensors; and compare a ratio of the first impedance measurement to the second impedance measurement to determine a volume-related value associated with an area located between the first tissue location and the second tissue location; and a communication module to convert the measurements to a destination device-compatible format and to communicate the converted measurements to a destination device. - View Dependent Claims (35, 36, 37)
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Specification