Ambulatory cardiac monitoring system
First Claim
1. An ambulatory cardiac monitoring system to event record and monitor ECG signals from a patient for a predetermined time interval on a recording medium, said recording medium being removed from said patient subsequent to said predetermined time interval for insert into scanner means for producing printed outputs of said events recorded on said recording medium wherein the improvement comprises:
- recorder means to be coupled to said patient during said predetermined time interval, said recorder means being electrically coupled to said patient for (1) continuously monitoring said ECG signals of said patient during said predetermined time interval, and (2) entering a record signal on said recording medium responsive to prior ECG signals monitored from said patient during said predetermined time interval, said recorder means including analog pre-processor means having means for detecting a QRS signal wave complex of said monitored ECG signal for (1) normalization, (2) filtering, and (3) gain control of said monitored ECG signals to produce a plurality of analog pre-processor output signals.
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Abstract
An ambulatory cardiac monitoring system (10) to event record and monitor ECG signals (20) from a patient (12) for a predetermined time interval. The ambulatory cardiac monitoring system (10) includes a recorder system (18) which is carried by the patient (12). The recorder system (10) is coupled to the patient through leads (16) and electrodes (14) positionally located contiguous to the patient (12). The recorder system (18) includes an analog pre-processor (32), a first microcomputer (34) coupled in a feedback manner to analog pre-processor (32), and a cassette recorder (38). The analog pre-processor (32) has incorporated both automatic gain control and conditioning circuitry that normalizes and filters the basic ECG signal (20). The analog pre-processor (32) produces a plurality of extraction signals which are input to microcomputer (34). The microcomputer (34) continuously monitors the signal inputs from the analog pre-processor (32) as well as digitized ECG signal (20) from an analog/digital converter (36). The microcomputer (34) includes decision algorithms for classification of each heartbeat and tallies abnormal events. The memory of microcomputer (34) is used as a temporary storage area of the ECG signal (20) in order to delay the ECG signal (20) for a predetermined time interval in order that analysis of a particular signal may be obtained.
87 Citations
48 Claims
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1. An ambulatory cardiac monitoring system to event record and monitor ECG signals from a patient for a predetermined time interval on a recording medium, said recording medium being removed from said patient subsequent to said predetermined time interval for insert into scanner means for producing printed outputs of said events recorded on said recording medium wherein the improvement comprises:
recorder means to be coupled to said patient during said predetermined time interval, said recorder means being electrically coupled to said patient for (1) continuously monitoring said ECG signals of said patient during said predetermined time interval, and (2) entering a record signal on said recording medium responsive to prior ECG signals monitored from said patient during said predetermined time interval, said recorder means including analog pre-processor means having means for detecting a QRS signal wave complex of said monitored ECG signal for (1) normalization, (2) filtering, and (3) gain control of said monitored ECG signals to produce a plurality of analog pre-processor output signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48)
Specification