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Microlife Intellectual Property Gmbh

Wiesel, Joseph

Joseph Wiesel

Gerhard Frick

A method of determining atrial fibrillation includes determining if a patient's pulse beats form an irregular pattern. If so, presence of an irregular pulse is indicated to a patient and, an electrocardiogram is obtained for determining atrial fibrillation. Initially, a pulse is detected at regular time intervals from a first appendage when motionless, using a pulse detector and pulse rhythms from a succession of time intervals, each corresponding to a respective interval of time between successive pulse beats of a sequence of the pulse beats. Then, a second appendage makes contact with an electrically conductive unit, and electrocardiogram signals are detected simultaneously with pulse rhythms while the first appendage is motionless and both appendages are relaxed. The signals are then analyzed to determine whether, in combination, they are indicative of atrial fibrillation. If atrial fibrillation is determined not to be present based on analysis of said ECG, then the pulse analyzer is adjusted to not detect that pulse pattern as irregular.

Method and apparatus for detecting atrial fibrillation

A device for measuring blood pressure and for indicating the presence of atrial fibrillation, includes an inflatable cuff, a pump, at least one pressure sensor for measuring the pressure inside the cuff, a pressure relief valve for deflating the cuff, and a control unit for controlling the pump and the valve. A calculating unit determines the presence or absence of atrial fibrillation on the basis of pressure variation sensed by the sensor. The calculating unit is adapted to independently determine the presence of atrial fibrillation on the basis of at least one, preferably two sequences, of pulse beats. The control unit is configured to maintain the pressure in a predefined range or to restore the pressure to a predefined range for an additional sequence, and to determine the presence of atrial fibrillation only if the calculating unit determines the presence of atrial fibrillation during a first and/or preceding sequence.

Device and method for measuring blood pressure and for indication of the presence of atrial fibrillation

Method of determining atrial fibrillation including determining if a patient's pulse beats form an irregular pattern and only if so, indicating the presence of an irregular pulse to the patient and obtaining an electrocardiogram for determining atrial fibrillation. Initially, a pulse is detected at regular time intervals of a first appendage of the patient when motionless using a pulse detector secured to the first appendage and pulse rhythms from a succession of time intervals are detected each corresponding to a respective interval of time between successive pulse beats of a sequence of the pulse beats. Then, an electrically conductive unit is attached to a second appendage of the patient, or a wearable electrocardiogram is attached to the patient, and electrocardiograms signals are detected simultaneously with pulse rhythms while the first appendage is motionless and analyzed to determine whether, in combination, they are indicative of atrial fibrillation. If so, an indication of atrial fibrillation is provided at least to the patient.

A method and apparatus to determine possible atrial fibrillation or absence of atrial fibrillation that includes detecting pulse rhythms from a succession of time intervals each corresponding to a respective interval of time between successive pulse beats; analyzing the detected pulse rhythms to make a determination of possible atrial fibrillation; indicating the possible atrial fibrillation from the determination; or making a determination of the absence of atrial fibrillation.

Detecting atrial fibrillation, method of and apparatus for

A method and apparatus to determine possible atrial fibrillation that includes detecting irregular pulse rhythms from a succession of time intervals each corresponding to a respective interval of time between successive pulse beats of a sequence of the pulse beats; analyzing the detected irregular pulse rhythms to make a determination of possible atrial fibrillation; indicating the possible atrial fibrillation from the determination. If a sphygmomanometer is used, a plurality of pulse beats may be detected with it including the sequence of pulse beats; and respiratory variation in systolic pressure of the pulse beats may be compensated by designating the succession of time intervals to exclude at least an initial one of the plurality of time intervals.

Method of and apparatus for detecting atrial fibrillation

The presence of irregular heartbeat and/or possible atrial fibrillation is determined by analyzing a measured pulse rate pattern or heart rate pattern. The standard deviation and mean of time intervals each corresponding to a respective heartbeat are determined and compared to a threshold value. When quotient formed by dividing the standard deviation by the mean has a value greater than or equal to the threshold value, the shortest one of the time intervals and its succeeding time intervals are determined, and the succeeding time interval is compared to the mean. If the succeeding time interval is less than the mean, then the heartbeat is irregular. Alternatively, if the succeeding time interval is greater than the mean, the shortest time interval and its succeeding time interval are eliminated from the sample values, a new mean and standard deviation are determined, and the quotient of the new standard deviation divided by the new mean are compared to the threshold value. When the quotient is greater than the threshold value, the next shortest interval is determined, and the absolute value of the difference between the next shortest interval and the shortest interval is compared to an empirically determined value. If the difference is greater than the empirically determined value, the heartbeat is irregular. Alternatively, if the difference is greater than the empirically determined value, then the next shortest interval and its succeeding interval are redefined as the new shortest interval and is succeeding interval. The steps are repeated until it is determined that the heartbeat is regular or irregular.

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West Hempstead, NY, United States of America

Joseph Wiesel