Biotronik Mess-und Therapiegeraete Gmbh & Co Ingenieurbuero Berlin

Biotronik Mess-und Therapiegeraete Gmbh & Co.

Biotronik Mess- Und Therapiegeraete Gmbh

Paul Wyborny

Max Schaldach

Tran Thong

Dennis Digby

Indra B Nigam

Nawzer Mehta

Gustav Boheim

A method of storing signals having a course over time in an implantable medical device, and/or transmitting the signals out of the device and out of the patient's body, with the course over time being detected in the device, particularly at predetermined time intervals with a constant sampling interval, and a sequence of signal samples being obtained therefrom, of which a partial quantity is stored and/or transmitted as the result of a selection made with a predetermined selection criterion, with the selection criterion being the first derivation of the course over time of the signals according to time, and with the selection being made such that the first derivation of the straight-line connection between an nth and the (n&#x2212;1)th signal sample is determined and compared to the first derivation of the straight-line connection between the(n&#x2212;1)thnthsignal sample and the last-stored and/or last-transmitted signal sample, and thenth(n&#x2212;1)thsignal sample is then stored and/or transmitted as the new last signal sample exactly when these first derivations differ by more than a predetermined value.

Method and apparatus for storing signals in an implantable medical device

An arrangement for determining the heart rate (f) or the refractory time of the cardiac tissue, particularly for detecting tachycardia or fibrillation, has an electrode (E) for sensing heart action signals (SIG), an input stage, connected to the electrode, for processing the heart action signals, a refractory member for ascertaining a refractory time value of the arrangement, in each case after a predetermined segment of a heart action signal, and a processing device, connected to the output of the input stage or of the refractory member, for determining the rate of the heart action signals, processed with blanking of the component that occurs during the refractory time, or for determining the refractory time value of the cardiac tissue. The arrangement further includes a device which is connected at least indirectly to the output of the processing device or of the input stage for automatically adjusting the refractory time of the refractory member as a function of a previously determined value of the heart rate or of a signal parameter of a previously determined heart action signal.

Arrangement for determining a heart rate by automatically establishing the optimal refractory time for heart rate determination

An arrangement for determining the heart rate (f.sub.RR) or the refractory ime of the cardiac tissue, particularly for detecting tachycardia or fibrillation, has an electrode (E) for sensing heart action signals (SIG), an input stage, connected to the electrode, for processing the heart action signals, a refractory member for ascertaining a refractory time value of the arrangement, in each case after a predetermined segment of a heart action signal, and a processing device, connected to the output of the input stage or of the refractory member, for determining the rate of the heart action signals, processed with blanking of the component that occurs during the refractory time, or for determining the refractory time value of the cardiac tissue. The arrangement further includes a device which is connected at least indirectly to the output of the processing device or of the input stage for automatically adjusting the refractory time of the refractory member as a function of a previously determined value of the heart rate or of a signal parameter of a previously determined heart action signal.

Arrangement for determining a heart rate automatically establishing the

Method of processing signals characteristic of cardiac activity and an

A method of storing signals having a course over time in an implantable medical device, and/or transmitting the signals out of the device and out of the patient's body, with the course over time being detected in the device, particularly at predetermined time intervals with a constant sampling interval, and a sequence of signal samples being obtained therefrom, of which a partial quantity is stored and/or transmitted as the result of a selection made with a predetermined selection criterion, with the selection criterion being the first derivation of the course over time of the signals according to time, and with the selection being made such that the first derivation of the straight-line connection between an nth and the (n-1)th signal sample is determined and compared to the first derivation of the straight-line connection between the (n-1)th signal sample and the last-stored and/or last-transmitted signal sample, and the nth signal sample is then stored and/or transmitted as the new last signal sample exactly when these first derivations differ by more than a predetermined value.

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Lake Oswego, OR, United States of America

Paul Wyborny