US5897575A
Expired / Lapsed
US
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Arrhythmia classification system with reliability indication that allows for low quality input signals in pacemakers
Assignee: Pacesetter Inc
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Filing: 1997-10-24
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Granted: 1999-04-27
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Expires: 2017-10-24
Abstract
Abstract An implantable cardiac device wherein a reliability indicator is developed for cardiac classification based on the presence or absence of noise. If the classification is unreliable a robust therapy is applied until the cardiac condition is confirmed.
Inventors
- 👤 John Wickham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 00:57
CPC Classifications
A; A61; A61N; A61N1/00; A61N1/18; A61N1/32; A61N1/36; A61N1/362; A61N1/3621; A61N1/38; A61N1/39; A61N1/3956
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
158 words
An implantable pacemaker comprising: a sensor for sensing intrinsic events in a patient's heart; a classifier classifying said events into one of several groups and generating control signals corresponding to a respective one of said groups, said control signals defining a therapy appropriate to each of said group; a reliability detector determining a reliability of said classifier, said reliability detector generating an indication if said reliability detector determines that said classifier made an unreliable classification; and a pulse generator receiving said control signals and said indication and generating in response first therapeutic rules in the presence of said indication and second therapeutic rules in the absence of said indication; wherein said reliability detector includes a noise sensor for detecting noise from said sensor, a feature extractor for extracting an event feature of sensed events in the presence of noise; and a comparator for comparing said event feature to a threshold, said indication being generated based on the comparison.
Claim 2
Dependent Claim
158 words
An implantable pacemaker comprising: a sensor for sensing intrinsic events in a patient's heart; a classifier classifying said events into one of several groups and generating control signals corresponding to a respective one of said groups, said control signals defining a therapy appropriate to each of said group; a reliability detector determining a reliability of said classifier, said reliability detector generating an indication if said reliability detector determines that said classifier made an unreliable classification; and a pulse generator receiving said control signals and said indication and generating in response first therapeutic rules in the presence of said indication and second therapeutic rules in the absence of said indication; wherein said reliability detector includes a noise sensor for detecting noise from said sensor, a feature extractor for extracting an event feature of sensed events in the presence of noise; and a comparator for comparing said event feature to a threshold, said indication being generated based on the comparison.
Claim 3
Dependent Claim
82 words
A pacemaker for implantation in a patient, said pacemaker comprising: a sensor sensing a cardiac event and generating a sensed signal; a pulse generator for generating therapeutic pulses in response to commands; a classifier classifying a condition of the patient's heart based on said sensed signal and generating a corresponding therapy signal; a reliability detector detecting a reliability of said therapy signal; and generating a reliability indication; and a controller receiving said therapy signal and said reliability indication and generating said commands.
Claim 4
Dependent Claim
82 words
A pacemaker for implantation in a patient, said pacemaker comprising: a sensor sensing a cardiac event and generating a sensed signal; a pulse generator for generating therapeutic pulses in response to commands; a classifier classifying a condition of the patient's heart based on said sensed signal and generating a corresponding therapy signal; a reliability detector detecting a reliability of said therapy signal; and generating a reliability indication; and a controller receiving said therapy signal and said reliability indication and generating said commands.
Claim 5
Dependent Claim
18 words
The pacemaker of claim 2 wherein said reliability detector includes a noise sensor detecting noise from said sensor.
Claim 6
Dependent Claim
23 words
The pacemaker of claim 3 wherein said reliability detector further includes an analyzer for analyzing said sensed signal in the presence of noise.
Claim 7
Dependent Claim
27 words
The pacemaker of claim 4 wherein said analyzer includes means for determining whether said sensed signal meets a preselected criteria, and it so, generating said reliability indication.
Claim 8
Dependent Claim
20 words
The pacemaker of claim 3 wherein said reliability detector includes a noise timer to determine if said noise is continuous.
Claim 9
Dependent Claim
22 words
The pacemaker of claim 6 wherein said reliability detector is adapted to generate said reliability indication in the presence of continuous noise.
Claim 10
Dependent Claim
15 words
The pacemaker of claim 3 wherein said pulse generator includes means for generating pacing pulses.
Claim 11
Dependent Claim
15 words
The pacemaker of claim 3 wherein said pulse generator includes means for generating defibrillation pulses.
Claim 12
Dependent Claim
18 words
The pacemaker of claim 3 where said reliability detector includes means for measuring a signal amplitude or morphology.
Claim 13
Dependent Claim
22 words
The pacemaker of claim 3 where said reliability detector includes means for classifying a low signal amplitude as a low quality signal.
Claim 14
Dependent Claim
30 words
The pacemaker of claim 3 where said controller is adapted to acquire more input signals for an improved rhythm classification if the said reliability detector indicates a low signal quality.
Claim 15
Dependent Claim
24 words
The pacemaker of claim 3 where said controller selects a safer form of therapy if the said reliability detector indicates a low signal quality.
Claim 16
Independent Claim
97 words
A method of applying cardiac therapy to a patient using an implantable device comprising the steps of: sensing a cardiac event and generating a response to a sense signal; sensing a noise signal associated with said cardiac event; classifying said sense signal as a first cardiac condition in the absence of noise; analyzing said sensed signal in the presence of noise to determine if center preselected criteria are met; classifying said sense signal as a second condition in the presence of said criteria; and applying therapeutic pulses in accordance with all of said first and second conditions.
Claim 17
Independent Claim
97 words
A method of applying cardiac therapy to a patient using an implantable device comprising the steps of: sensing a cardiac event and generating a response to a sense signal; sensing a noise signal associated with said cardiac event; classifying said sense signal as a first cardiac condition in the absence of noise; analyzing said sensed signal in the presence of noise to determine if center preselected criteria are met; classifying said sense signal as a second condition in the presence of said criteria; and applying therapeutic pulses in accordance with all of said first and second conditions.
Claim 18
Dependent Claim
13 words
The method of claim 10 further comprising detecting if said noise is continuous.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 2002-04-26 | 2002-10-26 | 2003-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-04-26 | 2006-10-26 | 2007-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-04-26 | 2010-10-26 | 2011-04-27 | $7700.00 | Window Closed / Lapsed |