EP0170448A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Personal electrocardiogram monitor
Assignee: Purdue Research Foundation
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Filing: 1985-07-10
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Granted: —
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Expires: 2005-07-10
Abstract
Abstract 57 A pocket-sized, self-contained electrocardiogram monitor with a dot-matrix, liquid-crystal display. The monitor uses dry electrodes and is suitable for direct placement against the patient's chest without the use of paste or gel to insure electrical contact. An A/D converter converts an ECG signal to a digital signal which is then processed by a microprocessor and then displayed on the liquid-crystal display in real time. The microprocessor is programmed to select the maximum and minimum digital values from four consecutive samples from the A/D converter and to supply data representative of the maximum and minimum values to the display at one-fourth the conversion sampling rate.
Inventors
- 👤 Leslie A. Geddes
- 👤 Neal E. Fearnot
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 19:37
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/24; A61B5/316; A61B5/318; A61B5/332; A61B5/339
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
66 words
A handheld, self-contained electrocardiogram monitor, comprising: a) a housing: b) a plurality of electrodes mounted on said housing for contact with a patient's chest; c) circuit means contained within said housing for processing an electrocardiogram signal appearing upon said electrodes when said electrodes are held against the chest of a patient; and d) electro-optic display means mounted on said housing for displaying said processed electrocardiogram signal.
Claim 2
Dependent Claim
66 words
A handheld, self-contained electrocardiogram monitor, comprising: a) a housing: b) a plurality of electrodes mounted on said housing for contact with a patient's chest; c) circuit means contained within said housing for processing an electrocardiogram signal appearing upon said electrodes when said electrodes are held against the chest of a patient; and d) electro-optic display means mounted on said housing for displaying said processed electrocardiogram signal.
Claim 3
Dependent Claim
38 words
The electrocardiogram monitor of claim 1 wherein said circuit means includes means for generating a display drive signal representative of said electrocardiogram signal, and wherein said electro-optic display is responsive to said display drive signal in real time.
Claim 4
Dependent Claim
25 words
The electrocardiogram monitor of claim 1 or 2, further comprising means for activating said circuit means when said electrodes contact the skin of a patient.
Claim 5
Dependent Claim
35 words
The electrocardiogram monitor of any preceding claim further comprising means for maintaining a display of an electrocardiogram signal for a preset period of time after said electrodes are removed from the skin of a patient.
Claim 6
Dependent Claim
16 words
The electrocardiogram monitor of any preceding claim wherein said electrodes are dry electrodes mounted in line.
Claim 7
Dependent Claim
24 words
The electrocardiogram monitor of any preceding claim wherein said circuit means includes means for enhancing small signals near the baseline of said electrocardiogram signal.
Claim 8
Dependent Claim
85 words
The electrocardiogram monitor of any preceding claim wherein said electro-optic display means includes a dot-matrix, liquid--crystal display having row and column address inputs, and wherein said circuit means further includes 1) A/D converter means for converting the electrocardiogram signal from said electrodes to a digital electrocardiogram signal; and 2) digital procesing means coupled between said A/D converter means and said display for supplying said digital signal to said row input of said display and for supplying a corresponding time base signal to said column input.
Claim 9
Dependent Claim
138 words
A handheld, self-contained electrocardiogram monitor, comprising: a) a pocketsized, elongated housing having front and back sides parallel to its longitudinal axis; b) three dry electrodes mounted on said back side of said housing in a line parallel to said longitudinal axis; c) circuit means contained within said housing and coupled to said electrodes for converting an analog electrocardiogram signal appearing upon said electrodes to a digital electrocardiogram signal, said circuit means including means for generating a digital time base signal; and d) an elongated, dot-matrix, liquid-crystal display mounted on said front side of said housing with its rows of display elements situated parallel to said longitudinal axis of said housing, said liquid-crystal display having row and column inputs connected to said circuit means so as to receive, respectively, said digital electrocardiogram signal and said digital time base signal.
Claim 10
Dependent Claim
138 words
A handheld, self-contained electrocardiogram monitor, comprising: a) a pocketsized, elongated housing having front and back sides parallel to its longitudinal axis; b) three dry electrodes mounted on said back side of said housing in a line parallel to said longitudinal axis; c) circuit means contained within said housing and coupled to said electrodes for converting an analog electrocardiogram signal appearing upon said electrodes to a digital electrocardiogram signal, said circuit means including means for generating a digital time base signal; and d) an elongated, dot-matrix, liquid-crystal display mounted on said front side of said housing with its rows of display elements situated parallel to said longitudinal axis of said housing, said liquid-crystal display having row and column inputs connected to said circuit means so as to receive, respectively, said digital electrocardiogram signal and said digital time base signal.
Claim 11
Dependent Claim
60 words
The electrocardiogram monitor of claim 7 or 8 wherein said digital processing means includes means for selecting the maximum and minimum digital values from a plurality of consecutive samples generated by said A/D converter and supplying data representative of said maximum and minimum values to said display at a rate which is an integral fraction of the converter sampling rate.
Claim 12
Dependent Claim
21 words
The electrocardiogram monitor of claim 7,8 or 9, further comprising storage means for storing a portion of the digital electrocardiogram signal.
Claim 13
Dependent Claim
28 words
The electrocardiogram monitor of any of claims 7 to 10, wherein said circuit means includes means for enhancing small signals near the baseline of said analog electrocardiogram signal.
References Cited (Backward Citations)
No citation records indexed.
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