Providing Impedance Plethysmography Electrodes
First Claim
1. A method of measuring lung impedance of a subject, the method comprising:
- positioning current-injection electrodes on or within the subject in a configuration such that a current injected between the current-injection electrodes propagates substantially through a first lung of the subject, and not through a heart and a second lung of the subject;
positioning voltage-measurement electrodes on or within the subject in a configuration such that voltage measuring fields propagate substantially through the first lung and the second lung of the subject, but not through the heart of the subject; and
injecting a current between the current-injection electrodes, as positioned, and measuring a resulting voltage between the voltage-measurement electrodes, as positioned, to obtain an impedance measure across lung tissue.
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Accused Products
Abstract
A method of measuring lung impedance of a subject can include positioning current-injection electrodes on or within the subject in a configuration such that a current injected between the current-injection electrodes propagates substantially through a first lung of the subject, and not through a heart and a second lung of the subject; positioning voltage-measurement electrodes on or within the subject in a configuration such that voltage measuring fields propagate substantially through the first lung and the second lung of the subject, but not through the heart of the subject; and injecting a current between the current-injection electrodes, as positioned, and measuring a resulting voltage between the voltage-measurement electrodes, as positioned, to obtain an impedance measure across lung tissue. The method can further include injecting current and measuring the resulting voltage multiple times over a time period to monitor respiration of the subject over the time period.
75 Citations
20 Claims
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1. A method of measuring lung impedance of a subject, the method comprising:
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positioning current-injection electrodes on or within the subject in a configuration such that a current injected between the current-injection electrodes propagates substantially through a first lung of the subject, and not through a heart and a second lung of the subject; positioning voltage-measurement electrodes on or within the subject in a configuration such that voltage measuring fields propagate substantially through the first lung and the second lung of the subject, but not through the heart of the subject; and injecting a current between the current-injection electrodes, as positioned, and measuring a resulting voltage between the voltage-measurement electrodes, as positioned, to obtain an impedance measure across lung tissue. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of measuring a respiration parameter in a living being, the method comprising:
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implanting in the living being a system, the system comprising a) a wireless transmitter;
b) three distinct lead wires; and
c) four distinct electrodes disposed on the three distinct lead wires, wherein each of the three distinct lead wires has disposed thereon at least one of the four distinct electrodes and wherein implanting the three distinct lead wires comprises implanting the three lead wires subcutaneously or sub-muscularly;injecting a current between two of the four distinct electrodes to create a current field in the living being, and measuring a resulting voltage between the other two of four distinct electrodes; transmitting from the wireless transmitter to a receiver that is external to the living being a value corresponding to the measured voltage; and determining from the value a respiration parameter for the living being. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. A method of measuring a respiration parameter in a living being, the method comprising:
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implanting in the living being a system, the system comprising a) a wireless transmitter;
b) three distinct lead wires; and
c) four distinct electrodes disposed on the three distinct lead wires, wherein each of the three distinct lead wires has disposed thereon at least one of the four distinct electrodes and wherein implanting the three distinct lead wires comprises implanting the three lead wires subcutaneously or sub-muscularly;developing a voltage potential between two of the four distinct electrodes to create a voltage field in the living being, and measuring a resulting current between the other two of four distinct electrodes; transmitting from the wireless transmitter to a receiver that is external to the living being a value corresponding to the measured current; and determining from the value a respiration parameter for the living being.
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20. A method of measuring lung impedance of a subject, the method comprising:
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positioning current-injection electrodes within the subject in a configuration such that a current injected between the current-injection electrodes propagates as a plurality of current fields through at least one lung of the subject; positioning voltage-measurement electrodes within the subject in a configuration such that a) corresponding voltage-measuring fields intersect the plurality of current fields substantially in the at least one lung and b) the voltage-measuring fields do not substantially intersect the plurality of current fields in a heart of the subject; and injecting a current between the current-injection electrodes, as positioned, and measuring a resulting voltage between the voltage-measurement electrodes, as positioned, to obtain an impedance measure across tissue of the at least one lung.
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Specification