Invention Grant
- Patent Title: System and method for sensing and detection in an extra-cardiovascular implantable cardioverter defibrillator
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Application No.: US15964182Application Date: 2018-04-27
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Publication No.: US10507332B2Publication Date: 2019-12-17
- Inventor: Xusheng Zhang , Jian Cao , Saul E. Greenhut , Robert W. Stadler
- Applicant: Medtronic, Inc.
- Applicant Address: US MN Minneapolis
- Assignee: Medtronic, Inc.
- Current Assignee: Medtronic, Inc.
- Current Assignee Address: US MN Minneapolis
- Main IPC: A61N1/39
- IPC: A61N1/39 ; A61B5/0456 ; A61B5/042 ; A61B5/0464 ; A61B5/00

Abstract:
An extra-cardiovascular implantable cardioverter defibrillator senses R-waves from a first cardiac electrical signal by a first sensing channel and stores a time segment of a second cardiac electrical signal in response to each sensed R-wave. The ICD determines intervals between successively sensed R-waves and, in response to at least a predetermined number of the intervals being less than a tachyarrhythmia detection interval, analyzes at least a portion of the time segment of the second cardiac electrical signal corresponding to a most recent one of the sensed R-waves to confirm the most recent one of the R-waves. The ICD updates an unconfirmed beat count in response to the most recent one of the R-waves not being confirmed and withholds detection of a tachyarrhythmia episode in response to the unconfirmed beat count being equal to or greater than a rejection threshold.
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