US4960123A
Expired / Lapsed
US
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Differentiating between arrhythmia and noise in an arrhythmia control system
Assignee: Pacesetter Inc
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Filing: 1989-03-16
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Granted: 1990-10-02
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Expires: 2009-03-16
Abstract
Abstract A method and apparatus for differentiating between arrhythmia and noise in an antiarrhythmia device. A noise detection criteria is applied to a detected signal so as to detect noise simultaneously at two different sensitivity levels. When noise is not detected on the high gain channel the low gain channel is used for detecting arrhythmias. Arrhythmia therapy is then delivered.
Inventors
- 👤 Philip J. Maker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 03:59
CPC Classifications
A; A61; A61N; A61N1/00; A61N1/18; A61N1/32; A61N1/36; A61N1/362; A61N1/3621; A61N1/37; A61N1/3702; A61N1/3704; Y; Y10; Y10S; Y10S128/00; Y10S128/901
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
85 words
An apparatus for differentiating between arrhythmia and noise in an antiarrhythmia device comprising: a high gain channel detecting means for noise detection, a low gain channel detecting means for noise detection and for detecting the presence of an arrhythmia when no noise is detected by said high gain channel detecting means, arrhythmia therapy means responsive to said low gain channel detecting means for delivering arrhythmia therapy, and means for applying a noise detection criterion to each of said high and low gain channel detecting means.
Claim 2
Independent Claim
85 words
An apparatus for differentiating between arrhythmia and noise in an antiarrhythmia device comprising: a high gain channel detecting means for noise detection, a low gain channel detecting means for noise detection and for detecting the presence of an arrhythmia when no noise is detected by said high gain channel detecting means, arrhythmia therapy means responsive to said low gain channel detecting means for delivering arrhythmia therapy, and means for applying a noise detection criterion to each of said high and low gain channel detecting means.
Claim 3
Dependent Claim
30 words
An apparatus according to claim 1 further comprising arrhythmia detection means responsive to a tachyarrhythmia detected by said low gain channel detecting means, and for controlling said arrhythmia therapy means.
Claim 4
Dependent Claim
16 words
An apparatus according to claim 2 wherein said arrhythmia detection means is responsive to a fibrillation.
Claim 5
Dependent Claim
16 words
An apparatus according to claim 2 wherein said arrhythmia detection means is responsive to a tachycardia.
Claim 6
Dependent Claim
30 words
An apparatus according to claim 1 further comprising arrhythmia detection means responsive to a bradycardia detected by said low gain channel detecting means, and for controlling said arrhythmia therapy means.
Claim 7
Dependent Claim
20 words
An apparatus according to claim 1 further comprising interval distribution means for determining whether said noise detection criterion is met.
Claim 8
Dependent Claim
31 words
An apparatus according to claim 6 wherein said interval distribution means determines that said noise detection criterion is met when x out of y intervals are less than a specified value.
Claim 9
Dependent Claim
28 words
An apparatus according to claim 6 wherein said interval distribution means includes a calculating means for calculating frequency histograms to determine whether said noise detection criterion is met.
Claim 10
Dependent Claim
34 words
An apparatus according to claim 9 wherein said interval distribution means includes a calculating means for calculating statistical measures such as mean, median, or variance to determine whether said noise detection criterion is met.
Claim 11
Dependent Claim
21 words
An apparatus according to claim 1 wherein said arrhythmia therapy means is also responsive to said high gain channel detecting means.
Claim 12
Dependent Claim
35 words
An apparatus according to claim 10 wherein said arrhythmia therapy means does not deliver arrhythmia therapy when the high gain channel detecting means and the low gain channel detecting means noise detection criterion is satisfied.
Claim 13
Dependent Claim
33 words
The apparatus of claim 1, further comprising a tachyarrhythmia detecting means responsive to said high gain channel detection means for detecting a tachyarrhythmia, said tachyarrhythmia being one of a tachycardia or a fibrillation.
Claim 14
Independent Claim
90 words
A method of differentiating between arrhythmia and noise and treating detected arrhythmias in an antiarrhythmia device comprising; applying a noise detection criterion to a detected signal for detecting noise simultaneously at two distinct sensitivities, by means of a high gain channel and a low gain channel, and when said high gain channel does not detect noise, using said low gain channel as a noise free channel, irrespective of time varying amplitudes, for detecting an arrhythmia, and delivering arrhythmia therapy following the detection of an arrhythmia on said low gain channel.
Claim 15
Independent Claim
90 words
A method of differentiating between arrhythmia and noise and treating detected arrhythmias in an antiarrhythmia device comprising; applying a noise detection criterion to a detected signal for detecting noise simultaneously at two distinct sensitivities, by means of a high gain channel and a low gain channel, and when said high gain channel does not detect noise, using said low gain channel as a noise free channel, irrespective of time varying amplitudes, for detecting an arrhythmia, and delivering arrhythmia therapy following the detection of an arrhythmia on said low gain channel.
Claim 16
Dependent Claim
12 words
A method according to claim 13 wherein said arrhythmia is a tachyarrhythmia.
Claim 17
Dependent Claim
12 words
A method according to claim 14 wherein said tachyarrhythmia is a fibrillation.
Claim 18
Dependent Claim
12 words
A method according to claim 13 wherein said tachyarrhythmia is a tachycardia.
Claim 19
Dependent Claim
12 words
A method according to claim 13 wherein said arrhythmia is a bradycardia.
Claim 20
Dependent Claim
28 words
A method according to claim 13 wherein at the time of delivering said arrhythmia therapy, further using said high gain channel for detecting the presence of a tachyarrhythmia.
Claim 21
Dependent Claim
12 words
A method according to claim 18 wherein said tachyarrhythmia is a fibrillation.
Claim 22
Dependent Claim
12 words
A method according to claim 18 wherein said tachyarrhythmia is a tachycardia.
Claim 23
Dependent Claim
16 words
A method according to claim 13 wherein said noise detection criterion is based on interval distributions.
Claim 24
Dependent Claim
23 words
A method according to claim 21 wherein said interval distributions depend on x out of y intervals being less than a specified value.
Claim 25
Dependent Claim
15 words
A method according to claim 21 wherein said interval distributions are calculated using frequency histograms.
Claim 26
Dependent Claim
22 words
A method according to claim 21 wherein said interval distributions are calculated using statistical measures such as the mean, medians, or variance.
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