Method and device for sensing impedance respiration
First Claim
1. An apparatus for measuring the resistive component of the impedance of a network having shunt capacitance, comprising:
- (a) A generator device for injecting a known quantity of charge to the network, said network comprising one or more cables connected to electrodes in contact with the tissue of a patient, said charge inducing a voltage across the network; and
(b) An integrator connected to said network for integrating said voltage, the result of said integration being indicative of the resistive component of the impedance of the network.
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Accused Products
Abstract
An improved method and device for measuring transthoracic impedance through an ECG cable and electrodes, in which the measurement accuracy is substantially unaffected by shunt capacitance and series resistance within the cable, said device comprising a means for repetitively injecting alternating polarity impulses of charge into the ECG cable and electrodes, a demodulator, and a low pass filter. The measurement performed by integration of the transient voltage induced by the injected charge responds primarily to the resistive components of the cable and patient impedance, and substantially rejects the effects of the shunt capacitance.
43 Citations
41 Claims
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1. An apparatus for measuring the resistive component of the impedance of a network having shunt capacitance, comprising:
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(a) A generator device for injecting a known quantity of charge to the network, said network comprising one or more cables connected to electrodes in contact with the tissue of a patient, said charge inducing a voltage across the network; and
(b) An integrator connected to said network for integrating said voltage, the result of said integration being indicative of the resistive component of the impedance of the network. - View Dependent Claims (2, 11)
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3. An apparatus for measuring the resistive component of the impedance of a network having shunt capacitance, comprising:
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(a) A generator device for repeatedly injecting a known quantity of charge to the network, said network comprising one or more cables connected to electrodes in contact with the tissue of a patient, said charge inducing a voltage across the network;
(b) A demodulator connected to said network for demodulating the voltage;
.and(c) A low pass filter connected to the demodulator, the output of said low pass filter being indicative of the resistive component of the impedance of the network. - View Dependent Claims (4, 5)
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6. A method for measuring the resistive component of the impedance of a network having shunt capacitance, comprising the steps of:
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(a) Applying a known quantity of charge to the network, said charge inducing a voltage across the network; and
(b) Integrating said voltage over a predetermined time period, the result of said integration being indicative of the resistive component of the impedance of the network. - View Dependent Claims (7, 8, 9, 10, 12, 13, 14, 15)
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16. A method for measuring the resistive component of the impedance of a network having shunt capacitance, comprising the steps of:
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(a) Repeatedly applying a known quantity of charge to the network, said charge inducing a voltage across the network;
(b) Passing said voltage through a low pass filter, the output of the low pass filter being indicative of the resistive component of the impedance of the network. - View Dependent Claims (17, 18, 19, 20, 21)
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22. An apparatus for measuring the resistive component of the impedance of a network having shunt capacitance, comprising:
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(a) A means for applying a known quantity of charge to the network, said charge inducing a voltage across the network; and
(b) A means for integrating said voltage over a predetermined time period, the result of said integration being indicative of the resistive component of the impedance of the network. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. An apparatus for measuring the resistive component of the impedance of a network having shunt capacitance, comprising:
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(a) A means for applying a known quantity of charge to the network, said charge inducing a voltage across the network; and
(b) A means for low pass filtering said voltage, the result of said low pass filtering being indicative of the resistive component of the impedance of the network. - View Dependent Claims (33, 34, 35, 36, 37, 38, 39, 40, 41)
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Specification