Cardiac event detector
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Abstract
A detector for detecting a cardiac event in an IEGM has a bank of digital filters composed of at least two filters with substantially different impulse responses corresponding to different properties of the cardiac event. The filters respectively filter different portions of the IEGM and respectively emit a value per time unit corresponding to the morphological resemblance between the IEGM and the finite impulse response. An analyzing unit combines these output values from the filters in a predetermined manner for comparison with predetermined detection criteria.
4 Citations
44 Claims
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1-21. -21. (canceled)
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22. A cardiac event detector for detecting cardiac events in an IEGM, comprising:
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a plurality of digital filters having respectively different filter characteristics, at least two of said filters having substantially orthogonal impulse responses to different properties of a cardiac event to be detected, said at least two filters each emitting a value per time unit corresponding to a morphological resemblance between a portion of said IEGM and the filter impulse response for that filter; and
an analyzing unit supplied with respective outputs from said plurality of digital filters, including said at least two filters, for comparing said output signals with a defined detection criterion for said cardiac event to be detected. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43)
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44. A heart stimulator comprising:
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a pulse generator for generating cardiac stimulation pulses;
a control unit connected to said pulse generator for controlling generation of said stimulation pulses;
an electrode system connected to said pulse generator, and adapted for interaction with a heart, for delivering said stimulation pulses to the heart, and for detecting an IEGM from the heart; and
a cardiac event detector, connected to said electrode system, for detecting cardiac events in an IEGM, comprising a plurality of digital filters having respectively different filter characteristics, at least two of said filters having substantially orthogonal impulse responses to different properties of a cardiac event to be detected, said at least two filters each emitting a value per time unit corresponding to a morphological resemblance between a portion of said IEGM and the filter impulse response for that filter, and an analyzing unit supplied with respective outputs from said plurality of digital filters, including said at least two filters, for comparing said output signals with a defined detection criterion for said cardiac event to be detected, said analyzing unit supplying a result of said analysis to said control unit and said control unit modifying generation of said stimulation pulses dependent thereon.
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Specification