Cardiac pacing system with improved physiological event classification based on DSP
First Claim
1. A cardiac pacing system having a pacemaker and lead means for interconnecting said pacemaker and the patient'"'"'s heart, said pacemaker having pulse means for generating pacing pulses and control means for controlling the operation of said pacemaker, said lead means having electrode means for delivering pacing pulses to a patient'"'"'s heart and for sensing cardiac signals, said pacemaker having DSP means for amplifying and processing said cardiac signals sensed by said electrode means, and classifying means for classifying sensed cardiac signals, said DSP means comprising at least one DSP channel, said channel comprising:
- conversion means for converting said received amplified signals to digital signals;
digital filter means for filtering said converted signals to provide filtered signals;
slope means for operating on said filtered signals to provide slope signals representative of the slope of said filtered signals;
sense means for determining from said filtered signals and said slope signals whenever a cardiac event is detected, and the sense time of each said detection;
analysis window means for timing out an analysis window of predetermined duration following or preceding a said sense time;
parameter means for processing said filtered signals and said slope signals during said analysis window, and for generating from said processing a plurality of respective parameters from said signals; and
wherein said pacemaker further comprises classification means for receiving said parameters from said DSP means and for classifying each said signal as a function of said parameters.
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Accused Products
Abstract
There is provided an implantable cardiac pacing system or other cardiac monitoring system, having an enhanced capability of classifying intracardiac signals through a combination of DSP techniques and software algorithms. The implantable device has one or more DSP channels corresponding to different signals which are being monitored. Each DSP channel provides for amplification of the incoming signal; conversion from analog to digital form; digital filtering of the converted signals to provide filtered signals; operating on the filtered signals to provide slope signals; determining from the filtered and slope signals whenever an intracardiac event has been detected, e.g., R wave, P wave, etc.; and signal processing of the filtered and slope signals for a predetermined analysis interval after threshold crossing, for generating a plurality of signal parameters. The thus generated signal parameters corresponding to a signal are further operated on by a programmable algorithm to classify the detected event based upon the DSP-generated parameters. By this combination of digital signal processing and programmable software coordinated with each DSP channel, enhanced intracardiac signal classification is achieved.
149 Citations
21 Claims
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1. A cardiac pacing system having a pacemaker and lead means for interconnecting said pacemaker and the patient'"'"'s heart, said pacemaker having pulse means for generating pacing pulses and control means for controlling the operation of said pacemaker, said lead means having electrode means for delivering pacing pulses to a patient'"'"'s heart and for sensing cardiac signals, said pacemaker having DSP means for amplifying and processing said cardiac signals sensed by said electrode means, and classifying means for classifying sensed cardiac signals, said DSP means comprising at least one DSP channel, said channel comprising:
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conversion means for converting said received amplified signals to digital signals; digital filter means for filtering said converted signals to provide filtered signals; slope means for operating on said filtered signals to provide slope signals representative of the slope of said filtered signals; sense means for determining from said filtered signals and said slope signals whenever a cardiac event is detected, and the sense time of each said detection; analysis window means for timing out an analysis window of predetermined duration following or preceding a said sense time; parameter means for processing said filtered signals and said slope signals during said analysis window, and for generating from said processing a plurality of respective parameters from said signals; and wherein said pacemaker further comprises classification means for receiving said parameters from said DSP means and for classifying each said signal as a function of said parameters. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A cardiac pacing system, having a pulse generator for generating pacing pulses and lead means for delivering said pacing pulses to a patient'"'"'s heart and for sensing intracardiac signals from said patient'"'"'s heart, and control means for controlling the operation of said pulse generator as a function of sensed intracardiac signals, said control means comprising:
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a DSP circuit having a plurality of channels, each said channel having processing means for determining when a said intracardiac signal has occurred and for processing said signal to generate a plurality of signal parameters, and each said channel being programmable and having data stored therein for use in sensing and classifying a respective type of intracardiac signal; microprocessor means for operating on each said plurality of signal parameters to classify the signal that has occurred, said microprocessor means having a respective programmable signal algorithm corresponding to each of said DSP channels and operating means for selecting the signal algorithm corresponding to the channel which has determined a signal occurrence and for classifying the signal that has occurred; and handling means for handling pacemaker operation in response to each type of signal which has occurred. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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Specification