Self-calibrating adaptive-rate cardiac pacemaker
First Claim
1. A self-calibrating adaptive-rate cardiac pacemaker comprising a measuring and processing device for measuring the course over time of a physiological variable over a predetermined portion of a heart cycle and for obtaining a course parameter from the course over time;
- a stimulation parameter determining device connected to receive the course parameter from the measuring and processing device for determining a stimulation parameter value comprising an adaptive stimulation rate;
a body sensor connected to an input of the stimulation parameter determining device, for detecting an exertion variable, which is used jointly with the course parameter by said stimulation parameter determining device to determine the stimulation parameter value; and
a stimulator unit for generating and outputting stimulation pulses at the determined stimulation parameter value;
said measuring and processing device being arranged to obtain a plurality of different values of the course parameter as a function of at least one setting parameter in a calibration phase; and
said stimulation parameter determining device comprising a stimulation parameter calculating device for calculating a plurality of stimulation parameter selection values, each as a function of one value for the course parameter, a reference parameter calculating device, connected to receive the exertion variable from the body sensor for calculating an activity-determined reference parameter value, a comparator unit, connected to the stimulation parameter calculating device for receiving and comparing the parameter selection values with the reference parameter value, and a decision-making device, connected to an output of the comparator unit for selecting one of the values of said setting parameter of the measuring and processing device, associated with the parameter selection values, as a current value of said setting parameter to control said stimulation parameter determining device to determine a stimulation parameter in accordance with said current value.
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Accused Products
Abstract
A self-calibrating adaptive-rate cardiac pacemaker having a measuring and processing device for measuring the course over time of a physiological variable over a predetermined portion of a heart cycle and for obtaining a course parameter from the course over time, a stimulation parameter determining device downstream of the measuring and processing device and controlled by a sequence controller for determining a stimulation parameter value, in particular the adaptive stimulation rate, a body sensor connected to one input of the stimulation parameter determining device, for detecting an exertion variable, whose signal is used jointly with the course parameter to determine the stimulation parameter value, and a stimulator unit for generating and outputting stimulation pulses at the determined stimulation parameter value. The measuring and processing device is arranged to obtain a plurality of different values of the course parameter as a function of at least one setting point in a calibration phase, and the stimulation parameter determining device has a stimulation parameter calculating device connected downstream of the measuring and processing device for calculating a plurality of stimulation parameter selection values, each as a function of one value for the course parameter, a reference parameter calculating device connected downstream of the body sensor, for calculating an activity -determined reference parameter value, a comparator unit connected on the input side to the stimulation parameter calculating device and to the reference parameter calculating device, for comparing the parameter selection values with the reference parameter value, and a decision-making device connected on the input side to the output of the comparator unit, for selecting one of the setting point values of the measuring and processing device, associated with the parameter selection values, as current setting point value for further control of the pacemaker, substantially on the basis of the course parameter as the outcome of the comparison.
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Citations
9 Claims
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1. A self-calibrating adaptive-rate cardiac pacemaker comprising a measuring and processing device for measuring the course over time of a physiological variable over a predetermined portion of a heart cycle and for obtaining a course parameter from the course over time;
- a stimulation parameter determining device connected to receive the course parameter from the measuring and processing device for determining a stimulation parameter value comprising an adaptive stimulation rate;
a body sensor connected to an input of the stimulation parameter determining device, for detecting an exertion variable, which is used jointly with the course parameter by said stimulation parameter determining device to determine the stimulation parameter value; and
a stimulator unit for generating and outputting stimulation pulses at the determined stimulation parameter value;
said measuring and processing device being arranged to obtain a plurality of different values of the course parameter as a function of at least one setting parameter in a calibration phase; and
said stimulation parameter determining device comprising a stimulation parameter calculating device for calculating a plurality of stimulation parameter selection values, each as a function of one value for the course parameter, a reference parameter calculating device, connected to receive the exertion variable from the body sensor for calculating an activity-determined reference parameter value, a comparator unit, connected to the stimulation parameter calculating device for receiving and comparing the parameter selection values with the reference parameter value, and a decision-making device, connected to an output of the comparator unit for selecting one of the values of said setting parameter of the measuring and processing device, associated with the parameter selection values, as a current value of said setting parameter to control said stimulation parameter determining device to determine a stimulation parameter in accordance with said current value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
- a stimulation parameter determining device connected to receive the course parameter from the measuring and processing device for determining a stimulation parameter value comprising an adaptive stimulation rate;
Specification