EP0713714A2
Expired / Lapsed
EP
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Correlator based electromagnetic interference responsive control system useful in medical devices
Assignee: Pacesetter Inc
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Filing: 1995-11-07
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Granted: —
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Expires: 2015-11-07
Abstract
Abstract A system is provided to control operation of an implantable medical device (10) based upon detected EMI (electromagnetic interference). A correlator (20) produces a correlation function indicating the level of an EMI component (14) of an input biomedical signal that includes a biomedical signal component and an EMI component (14), and that is monitored relative to a predetermined threshold to allow the device (10) to operate in a normal manner as long as the intensity or level of the EMI component (14) is such that it does not affect or interfere with device operation. One ore more remedial measures may be selected in the event the level of the EMI component (14) exceeds a predetermined threshold. The system is useful with an electronic device which receives an electronic information signal which may include an EMI component (14).
Inventors
- 👤 Mark J. Meltzer
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 08:58
CPC Classifications
G; G01; G01R; G01R29/00; G01R29/08; G01R29/0807; G01R29/0814; A; A61; A61N; A61N1/00; A61N1/18; A61N1/32; A61N1/36; A61N1/362; A61N1/37; A61N1/3718
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
61 words
An implantable medical device (10; 10a), characterized by: a correlator (20) for receiving (a) a biomedical signal that may include an EMI component (14), and (b) an EMI signal (14), said correleator (20) producing a correlation function that is indicative of said EMI component (14), whereby operation of said medical device (10; 10a) is controllable in response to said correlation function.
Claim 2
Dependent Claim
89 words
The implantable medical device of claim 1, characterized by: said correlator (20) including a first input (19) and a second input (22); said first input (19) being adapted for receiving said biomedical signal; said second input (22) being adapted for receiving said EMI signal (14); a threshold detector (32) operable in response to said correlation function for providing an output signal indicative of said EMI component (14) exceeding a predetermined threshold; and means (21) for controlling operation of said medical device (10; 10a) in response to said threshold signal.
Claim 3
Dependent Claim
31 words
The implantable medical device of claim 1 or 2, characterized by means for inhibiting at least some device operation when the level of said EMI component (14) exceeds a predetermined threshold.
Claim 4
Dependent Claim
31 words
The implantable medical device of any of claims 1 to 3, characterized by means for providing predetermined, staged, remedial measures in response to an increasing level of said EMI component (14).
Claim 5
Dependent Claim
31 words
The implantable medical device of any of claims 2 to 4, characterized by means for blanking said biomedical signal when the level of said EMI component (14) exceeds said predetermined threshold.
Claim 6
Dependent Claim
31 words
The implantable medical device of any of claims 2 to 5, characterized by means for generating a patient alarm when the level of said EMI component (14) exceeds said predetermined threshold.
Claim 7
Dependent Claim
38 words
The implantable medical device of any of claims 1 to 6, characterized by means (21, 48, 49) for providing an out of phase EMI cancellation signal when the level of said EMI component (14) exceeds a predetermined threshold.
Claim 8
Dependent Claim
55 words
The implantable medical device of any of claims 1 to 7, characterized by circuitry for processing said biomedical signal and further including a signal generator (54) to provide a test signal and a test circuit (56) responsive thereto, operable to monitor a response of said circuitry for processing said biomedical signal to said test signal.
Claim 9
Dependent Claim
50 words
The implantable medical device of any of claims 1 to 8 and further characterized by: a spectrum analyzer (50); a location determining means; a memory (52); and means for providing in said memory location indexed spectrum analysis information when the level of said EMI component (14) exceeds a predetermined threshold.
Claim 10
Dependent Claim
50 words
The implantable medical device of any of claims 1 to 9 and further characterized by: a spectrum analyzer (50); a time determining means; a memory (52); and means for providing in said memory time indexed spectrum analysis information when the level of said EMI component (14) exceeds a predetermined threshold.
Claim 11
Dependent Claim
56 words
The implantable medical device of any of claims 2 to 10, characterized by a first analog to digital converter (40) coupled to said first input (19); a second analog to digital converter (42) coupled to said second input (22); and an EMI detector (28) coupled to an input of said second analog to digital converter (42).
Claim 12
Dependent Claim
34 words
The implantable medical device of claim 11, characterized by a spectrum analyzer (52) coupled to an output of said EMI detector (28) and adapted for receiving a signal corresponding to said EMI signal (14).
Claim 13
Independent Claim
82 words
A method for determining the presence of an EMI component (14) in an information signal, characterized by the steps of: receiving an information signal as a first input (19) of a correlator (20); receiving an EMI signal (14) as a second input (22) of said correlator (20); correlating (102; 114) said information signal and said EMI signal (14) to produce a correlation function; and determining (103; 116) the presence of said EMI component (14) in said information signal from said correlation function.
References Cited (Backward Citations)
No citation records indexed.
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