Variable frequency impedance measurement
First Claim
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1. A method comprising:
- identifying a dosage of at least one defibrillation shock parameter selected for a patient for a pending defibrillation shock to be delivered to the patient with a defibrillator,wherein the defibrillation shock parameter is selected from the following group;
energy and defibrillation current;
after identifying the dosage, selecting a frequency of an excitation current as a function of the identified dosage;
applying the excitation current to the patient at the selected frequency;
measuring an impedance of the patient by measuring a response of the patient to application of the excitation current;
delivering the defibrillation shock to the patient; and
modulating the defibrillation shock based on the measured impedance to deliver the identified dosage to the patient.
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Abstract
When a defibrillator selects a dosage of energy or current to be delivered to a patient, the defibrillator selects an excitation current frequency and applies the excitation current at the selected frequency to the patient. The frequency of the excitation current is selected as a function of the dosage to be delivered. The patient'"'"'s response to the excitation current at the selected frequency will accurately reflect the impedance that the defibrillator will “see” when delivering the selected dosage of energy or current.
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Citations
16 Claims
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1. A method comprising:
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identifying a dosage of at least one defibrillation shock parameter selected for a patient for a pending defibrillation shock to be delivered to the patient with a defibrillator, wherein the defibrillation shock parameter is selected from the following group;
energy and defibrillation current;after identifying the dosage, selecting a frequency of an excitation current as a function of the identified dosage; applying the excitation current to the patient at the selected frequency; measuring an impedance of the patient by measuring a response of the patient to application of the excitation current; delivering the defibrillation shock to the patient; and modulating the defibrillation shock based on the measured impedance to deliver the identified dosage to the patient. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A defibrillator comprising:
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a processor that selects a dosage of at least one defibrillation shock parameter for a pending defibrillation shock to be delivered to a patient, wherein the defibrillation shock parameter is selected from the following group;
energy and defibrillation current;a current source that generates an excitation current at a selectable frequency, the frequency of the excitation current being selected after dosage selection and as a function of the selected dosage; an impedance measuring circuit that measures impedance of the patient as a function of a response of the patient to application of the excitation current to the patient, wherein the processor modulates the defibrillation shock based on the measured impedance to deliver the selected dosage to the patient; and at least two electrodes that deliver the defibrillation shock to the patient. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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Specification