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68 results about "Thoracic impedance" patented technology

The primary aim of this study was to elucidate the potential of thoracic impedance to estimate SV and CO during the Wingate test, which is unknown, and to compare these responses to those obtained from graded exercise testing, which should elicit maximal values for these variables.

Device for determining thoracic impedance

An electromedical implant includes a measuring signal generator, an impedance measuring unit to determine the impedance of human or animal tissue, a control unit which, for controlling the measuring signal generator and the impedance measuring unit, is at least indirectly connected to the measuring signal generator and to the impedance measuring unit, as well as an electrode arrangement comprising at least two electrodes which can be directly or indirectly connected or at least temporarily connected to the measuring signal generator and to the impedance measuring unit, or to a connection for such an electrode arrangement. The measuring signal generator is designed to generate and emit a current pulse or a series of current pulses, and the control unit is designed at a specific point in time to cause the measuring signal generator (to generate and emit a current pulse, and to cause the impedance measuring unit to measure the voltage that is present between the electrodes connected to the measuring signal generator and the impedance measuring unit after the passing of at least two time periods of different length that start with commencement of the current pulse being emitted and end before the end of emitting the current pulse, and to issue a voltage value which in each case represents the measured voltage.
Owner:BIOTRONIK SE & CO KG

System and method for impedance-based detection of pulmonary edema and reduced respiration using an implantable medical system

InactiveUS7628757B1Reduce rateAmplitude ratio is lowElectrotherapyCatheterHypopneaPulmonary edema
Techniques are provided for detecting pulmonary edema based on a comparison of impedance-based respiratory patterns and impedance-based cardiac patterns, i.e. patterns derived from thoracic impedance signals. In one example, a numerical ratio is calculated between average peak-to-peak amplitudes of the respiratory patterns and average peak-to-peak amplitudes of the cardiac patterns. Pulmonary edema is detected if the amplitude ratio falls below a pulmonary edema detection threshold. Techniques are also provided for controlling operation of an impedance-based reduced respiration detector, i.e. a detector which seeks to detect apnea, hypopnea, or the like, based on analysis of respiratory patterns derived from a thoracic impedance signal. If the numerical ratio falls below a minimum reliability threshold, then the reduced respiration detector is deactivated because episodes of reduced respiration cannot then reliably be derived from an analysis of respiration patterns obtained from the thoracic impedance signals.
Owner:PACESETTER INC

High-performance lung function detecting system and method based on thoracic impedance measurement

The invention relates to a high-performance lung function detecting system and method based on thoracic impedance measurement. The high-performance lung function detecting system comprises a microcontroller, an upper computer, an exciting circuit, a signal conditioning and data collection circuit, an electrode buffer unit and a special electrode array, wherein the exciting circuit generates an exciting current under control of the microcontroller, and the exciting current is obtained by converting a differential voltage signal and acts on the special electrode array through the electrode buffer unit; the signal conditioning and data collection circuit collects an exciting current signal and a response voltage signal through the electrode buffer unit; the microcontroller demodulates the exciting current signal and the response voltage signal, calculates the amplitude and phase of thoracic impedance and uploads the amplitude and phase of the thoracic impedance to the upper computer; andthe upper computer obtains the assessment result of lung functions of a detected object according to the amplitude and phase of the thoracic impedance. Compared with the prior art, the high-performance lung function detecting system and method have the advantages of easy implementation, low system cost, high detection sensitivity, fast and convenient measurement and the like, and the detecting experience of a doctor and a patient can be effectively improved.
Owner:SHANGHAI JIAO TONG UNIV

Method and auxiliary device of determining cardiopulmonary resuscitation quality parameters during process of cardiopulmonary resuscitation

The invention discloses a method and an auxiliary device of determining cardiopulmonary resuscitation quality parameters during the process of cardiopulmonary resuscitation. The auxiliary device comprises an incentive module, a signal collection module and a signal processing module. The incentive module is used for exerting an incentive signal on a target object. The signal collection module is used for collecting a responding signal produced by the target object to the incentive signal. The signal processing module is used for analyzing and collecting the responding signal to obtain a direct current component and an alternating current component of the signal processing module, and is used for analyzing and calculating the cardiopulmonary resuscitation quality parameters of the target object according to the direct current component and the alternating current component. According to the method and the device of determining the cardiopulmonary resuscitation quality parameters during the process of cardiopulmonary resuscitation, the incentive signal is exerted on the target object, the responding signal produced by the target object thoracic impedance when responding to the incentive signal is detected, analysis and calculation are carried out according to the responding signal, so that the parameters related to the cardiopulmonary resuscitation quality is obtained. Therefore, the whole quality of the cardiopulmonary resuscitation can be known in real time and cardiopulmonary resuscitation measure can be adjusted in time according to the parameters to achieve the perfect cardiopulmonary resuscitation effect.
Owner:ARMY MEDICAL UNIV

Method and implantable medical device for assessing a degree of pulmonary edema of a patient

In a method and an implantable medical device for assessing a degree of pulmonary edema of a patient, at least two specific body patients of the patent are detected and at least one impedance sensing session is initiated to sense trans-thoracic impedance signals from the patient when the patient is in one of the at least two specific positions. Impedance values are obtained from the impedance signals, and a relation between respective impedance values at the at least two positions is determined. This relation is then used as a metric of pulmonary edema to assess the degree of pulmonary edema, and is provided as an output.
Owner:ST JUDE MEDICAL

Method of vagal stimulation to treat patients suffering from congestive heart failure

An improved method is presented for evaluating the physiological status of a patient diagnosed with congestive heart failure and treating the patient accordingly to alleviate the congestive heart failure. As part of the method, the thoracic or cardiac impedance and ventilation of the particular patient are derived solely from an input consisting of cardiac signals (EKG) generated by electrical energy of the patient's heart as the heart is undergoing its cardiac cycle with a dynamic impedance obtained by subjecting the EKG to alternately high and low input impedances. The derived thoracic impedance and ventilation are used to control the pattern and rate at which stimulating electrical pulses are applied to the patient's vagus nerve by an implanted stimulator, in a manner to deliver therapy to the patient's heart by adjusting the heart rate to a prescribed target rate for alleviating the congestive heart failure. A change in state of the patient from one of rest to one of physical exercise and vice versa detected from the derived impedance and ventilation is accommodated by modifying the vagal stimulation therapy to adjust the patient's heart rate to a new target rate accordingly, while continuing to deliver the therapy for alleviating the congestive heart failure. A closed loop system is preferably employed for the control and adjustment functions.
Owner:MEDTRONIC INC

System and method for monitoring thoracic fluid levels based on impedance using an implantable medical device

Techniques are provided for monitoring thoracic fluid levels based on thoracic impedance (ZT) and cardiogenic impedance (ZC). In one example, the implantable device tracks the maximum time rate of change in cardiogenic impedance (i.e. max(dZC / dt)) to detect trends toward hypervolemic or hypovolemic states within the patient based on changes in heart contractility. The detection of these trends in combination with trends in thoracic impedance allows for a determination of whether the thoracic cavity of the patient is generally “too wet” or “too dry,” and thus allows for the titration of diuretics to avoid such extremes. In particular, a decrease in thoracic impedance (ZT) in combination with a decrease in max (dZC / dt) is indicative of the thorax being “too wet” (i.e. a fluid overload). Conversely, an increase in thoracic impedance (ZT) in combination with a decrease in max (dZC / dt) is indicative of the thorax being “too dry” (i.e. a fluid underload).
Owner:PACESETTER INC
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