System and method for analyzing an impedance course
First Claim
Patent Images
1. A system (10) comprising:
- an impedance detection unit (76) configured to determine impedance values, which represent a transthoracic impedance course;
an impedance analysis unit (78), which is connected to the impedance detection unit (76);
wherein the impedance analysis unit (78) is configured to determine a degree of modulation for a particular impedance course detected by the impedance detection unit (76);
wherein the impedance analysis unit (78) is further configured todetermine a respiration signal (R) from the transthoracic impedance course and to determine an effective value or mean amplitude of the respiration signal as a modulation parameter that represents the degree of modulation ordetermine the respiration signal (R) from the transthoracic impedance course and to determine a ratio of the effective value or the mean amplitude of the respiration signal to a mean impedance (M) of the transthoracic impedance course as the modulation parameter that represents the degree of modulation ordetermine the respiration signal (R) and a respiration frequency as a frequency of the respiration signal from the transthoracic impedance course and to determine a relation of the effective value of the respiration signal to the respiration frequency as the modulation parameter that represents the degree of modulationwherein the impedance analysis unit (78) is further configured to record trends of one or more modulation parameters over a predefined period of time and to determine trend parameters from these trends or to determine a difference to a preceding modulation parameter value as a trend parameter valuewherein the impedance analysis unit (78) is further configured torecord trends of one or more modulation parameters comprising a first modulation parameter, a second modulation parameter and a third modulation parameter over a predefined period of time and to determine trend parameters from these trends or todetermine a difference to a preceding modulation parameter value as a first trend parameter value, anddetermine a first difference between said first modulation parameter and said second modulation parameter wherein said first modulation parameter and said second modulation parameter are two sequential modulation parameters anddetermine a second difference between said second modulation parameter and said third modulation parameter wherein said second modulation parameter and said third modulation parameter are also two sequential modulation parametersandcompare said first difference to said second difference as a second trend parameter value; and
,wherein the impedance analysis unit (78) is coupled with a first threshold comparator (108) and a second threshold comparator (112) which are respectively configured to compare the first trend parameter value to a first threshold value and compare the second trend parameter value to a second threshold value and to generate a warning signal as a function of whether a respective first and second trend parameter values exceed or fall below the respective first and second threshold value.
2 Assignments
0 Petitions
Accused Products
Abstract
A system which generates a warning signal in the event of looming pulmonary edema and/or looming decompensation. The system has an impedance detection unit for determining impedance values, which represent a transthoracic impedance course, and an impedance analysis unit (78), which is connected to the impedance detection unit. The impedance analysis unit (78) is implemented to determine the degree of modulation for a particular impedance course detected by the impedance detection unit.
-
Citations
12 Claims
-
1. A system (10) comprising:
-
an impedance detection unit (76) configured to determine impedance values, which represent a transthoracic impedance course; an impedance analysis unit (78), which is connected to the impedance detection unit (76); wherein the impedance analysis unit (78) is configured to determine a degree of modulation for a particular impedance course detected by the impedance detection unit (76); wherein the impedance analysis unit (78) is further configured to determine a respiration signal (R) from the transthoracic impedance course and to determine an effective value or mean amplitude of the respiration signal as a modulation parameter that represents the degree of modulation or determine the respiration signal (R) from the transthoracic impedance course and to determine a ratio of the effective value or the mean amplitude of the respiration signal to a mean impedance (M) of the transthoracic impedance course as the modulation parameter that represents the degree of modulation or determine the respiration signal (R) and a respiration frequency as a frequency of the respiration signal from the transthoracic impedance course and to determine a relation of the effective value of the respiration signal to the respiration frequency as the modulation parameter that represents the degree of modulation wherein the impedance analysis unit (78) is further configured to record trends of one or more modulation parameters over a predefined period of time and to determine trend parameters from these trends or to determine a difference to a preceding modulation parameter value as a trend parameter value wherein the impedance analysis unit (78) is further configured to record trends of one or more modulation parameters comprising a first modulation parameter, a second modulation parameter and a third modulation parameter over a predefined period of time and to determine trend parameters from these trends or to determine a difference to a preceding modulation parameter value as a first trend parameter value, and determine a first difference between said first modulation parameter and said second modulation parameter wherein said first modulation parameter and said second modulation parameter are two sequential modulation parameters and determine a second difference between said second modulation parameter and said third modulation parameter wherein said second modulation parameter and said third modulation parameter are also two sequential modulation parameters and compare said first difference to said second difference as a second trend parameter value; and
,wherein the impedance analysis unit (78) is coupled with a first threshold comparator (108) and a second threshold comparator (112) which are respectively configured to compare the first trend parameter value to a first threshold value and compare the second trend parameter value to a second threshold value and to generate a warning signal as a function of whether a respective first and second trend parameter values exceed or fall below the respective first and second threshold value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
Specification