Patent US3602215A successfully refreshed from Google Patents.
US3602215A
Expired / Lapsed
US
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Electrode failure detection device
Assignee: Honeywell Inc
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Filing: 1968-09-16
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Granted: 1971-08-31
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Expires: 1988-09-16
Abstract
Abstract Apparatus is provided for detecting the failure of a set of lead means used in conjunction with an ECG. amplifier. The apparatus includes a constant current source connected to the individual lead means for generating a voltage therebetween representative of the transmission impedance of the lead means. Amplifying and level detecting means are connected to the lead means for generating trigger pulses indicative of lead failure whenever the transmission impedance of the lead means exceeds a predetermined magnitude. An indicator means driven by the trigger pulses is included to indicate the occurrence of lead failure.
Inventors
- 👤 John Parnell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:01
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/24; A61B5/25; A61B5/276; A61B5/279; A61B5/28; Y; Y10; Y10S; Y10S128/00; Y10S128/902
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
229 words
Apparatus for detecting the failure of a set of electromedical lead means wherein said set of lead means includes first, second and third lead means for application to the skin of a patient, said lead failure apparatus comprising; a first constant current source connected between said first and third lead means whereby to produce a first electrical potential difference between said first and third lead means representative of a first transmission impedance, between said first and third lead means; a second constant current source connected between said second and third lead means whereby to produce a second electrical potential difference between said second and third lead means representative of second transmission impedance, between said second and third lead means; said first and second transmission impedance being characterized by a significant change upon the occurrence of a lead faiLure; means for generating a control voltage proportional to the sum of said first and second electrical potential differences, said voltage being characterized by a significant change in magnitude corresponding to said change in said first and second transmission impedances; and trigger signal generating means responsive to said voltage for producing a trigger signal whenever the magnitude of said voltage exceeds a predetermined value, said trigger signal being indicative of lead failure; means connected to said trigger signal generating means for displaying an indication representative of an occurrence of said trigger signal.
Claim 2
Dependent Claim
229 words
Apparatus for detecting the failure of a set of electromedical lead means wherein said set of lead means includes first, second and third lead means for application to the skin of a patient, said lead failure apparatus comprising; a first constant current source connected between said first and third lead means whereby to produce a first electrical potential difference between said first and third lead means representative of a first transmission impedance, between said first and third lead means; a second constant current source connected between said second and third lead means whereby to produce a second electrical potential difference between said second and third lead means representative of second transmission impedance, between said second and third lead means; said first and second transmission impedance being characterized by a significant change upon the occurrence of a lead faiLure; means for generating a control voltage proportional to the sum of said first and second electrical potential differences, said voltage being characterized by a significant change in magnitude corresponding to said change in said first and second transmission impedances; and trigger signal generating means responsive to said voltage for producing a trigger signal whenever the magnitude of said voltage exceeds a predetermined value, said trigger signal being indicative of lead failure; means connected to said trigger signal generating means for displaying an indication representative of an occurrence of said trigger signal.
Claim 3
Dependent Claim
83 words
The invention recited in claim 1 wherein: said first and second constant current sources include an oscillator common to both said first and said second constant current sources having a base frequency; and including: filter means connecting said means for generating a voltage proportional to the sum of said first and second electrical potential differences with said trigger signal generating means, said filter means being operable to transmit to said trigger signal generating means only electrical signals of substantially said oscillator base frequency.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-30 | 1975-03-01 | 1975-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-30 | 1979-03-01 | 1979-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-30 | 1983-03-01 | 1983-08-31 | $7700.00 | Window Closed / Lapsed |