Devices and methods for respiratory variation monitoring by measurement of respiratory volumes, motion and variability
First Claim
Patent Images
1. A device for assessing a patient, the device comprising:
- a computing device comprising acquisition circuitry;
at least one impedance electrode adapted to be placed externally on a thorax or abdomen and functionally connected to the computing device;
wherein the computing device;
obtains transthoracic impedance signals and corresponding volume data from a plurality of test subjects;
obtains at least one of subject demographic information, subject physiological measurement, and baseline impedance level for each of the plurality of test subjects;
determines a device calibration coefficient relationship based on a relationship between the set of transthoracic impedance signals and corresponding volume data for each test subject and the at least one of subject demographic information, subject physiological measurement, and baseline impedance level for each of the plurality of test subjects;
obtains a transthoracic impedance signal from the patient via the impedance electrode and at least one of demographic information, a physiological measurement, and a baseline impedance level of the patient;
analyzes the transthoracic impedance signal from the patient and derives a calibration coefficient for the patient based on the device calibration coefficient relationship of the plurality of test subjects;
derives at least one of minute ventilation and tidal volume of the patient based on the transthoracic impedance signal and calibration coefficient of the patient; and
outputs at least one of the derived minute ventilation and tidal volume of the patient.
1 Assignment
0 Petitions
Accused Products
Abstract
This invention is directed to devices and methods for assessing a patient. The devices have at least one impedance measuring element functionally connected to a programmable element, programmed to analyze an impedance measurement, and to provide an assessment of at least one respiratory parameter of the patient. Preferably the device includes electronics which aid in calibration, signal acquisition, conditioning, and filtering.
61 Citations
54 Claims
-
1. A device for assessing a patient, the device comprising:
-
a computing device comprising acquisition circuitry; at least one impedance electrode adapted to be placed externally on a thorax or abdomen and functionally connected to the computing device; wherein the computing device; obtains transthoracic impedance signals and corresponding volume data from a plurality of test subjects; obtains at least one of subject demographic information, subject physiological measurement, and baseline impedance level for each of the plurality of test subjects; determines a device calibration coefficient relationship based on a relationship between the set of transthoracic impedance signals and corresponding volume data for each test subject and the at least one of subject demographic information, subject physiological measurement, and baseline impedance level for each of the plurality of test subjects; obtains a transthoracic impedance signal from the patient via the impedance electrode and at least one of demographic information, a physiological measurement, and a baseline impedance level of the patient; analyzes the transthoracic impedance signal from the patient and derives a calibration coefficient for the patient based on the device calibration coefficient relationship of the plurality of test subjects; derives at least one of minute ventilation and tidal volume of the patient based on the transthoracic impedance signal and calibration coefficient of the patient; and outputs at least one of the derived minute ventilation and tidal volume of the patient. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
-
-
28. A method for assessing a patient, comprising:
-
obtaining transthoracic impedance signals and corresponding volume data from a plurality of test subjects functionally connected to a computing device comprising acquisition circuitry via at least one impedance electrode adapted to be placed externally on a thorax or abdomen; obtaining at least one of subject demographic information, subject physiological measurement, and baseline impedance level for each of the plurality of test subjects; determining a device calibration coefficient relationship based on a relationship between the transthoracic impedance signals and corresponding volume data for each of the plurality of test subjects and the at least one of subject demographic information, subject physiological measurement, and baseline impedance level; obtaining a transthoracic impedance signal from the patient via the impedance electrode and at least one of demographic information, a physiological measurement, and a baseline impedance level of the patient; analyzing the transthoracic impedance signal from the patient and derives the calibration coefficient for the patient based on the device calibration coefficient relationship of the plurality of test subjects; deriving at least one of minute ventilation and tidal volume of the patient based on the transthoracic impedance signal and calibration coefficient of the patient; and outputting at least one of minute ventilation and tidal volume. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54)
-
Specification