Cardiac ambulatory monitor
First Claim
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1. An ambulatory arrhythmia detection and ECG recorder adapted to be carried by a patient comprising:
- (A) a plurality of electrodes adapted to be placed on the patient'"'"'s body for developing electrical signals indicative of the patient'"'"'s cardiac rhythm;
(B) amplifier and filter means connected to said electrodes for amplifying and filtering said electrical signals;
(C) recording means for recording the amplified and filtered electrical signals;
(D) recorder controller means having a plurality of inputs, said controller means activating said recording means whenever a control signal is applied to one of its inputs;
(E) timing means connected to said controller means and said recording means for deactivating said recording means after a preset time period has elapsed;
(F) means for converting said amplified and filtered electrical signals into a pulse train wherein each pulse represents a different QRS complex in said electrical signals and is generated in real time with its respective QRS complex;
(G) means for determining a tachycardia condition and being connected to one of said inputs to provide a first control signal thereto whenever a tachycardia condition is sensed;
(H) said means for determining a tachycardia condition including;
(i) a first oscillator controlled counter which counts at a first predetermined rate to a first predetermined number and which generates a first output signal each time it reaches said predetermined number;
(ii) said first counter having a reset input and having said pulse train applied thereto so that said counter is reset upon the receipt of each pulse;
(iii) a first accumulator having a reset input and a clock input, said reset input receiving said first output signals from said first counter to reset the accumulator each time a first output signal is received, said clock input receiving said pulse train to increment said accumulator each time a pulse is received, said accumulator producing said first conrol signal whenever the same is incremented to a first preset number;
(I) means for determining a bradycardia condition and being connected to another of said inputs to provide a second control signal thereto whenever a bradycardia condition is sensed, said means for determining a bradycardia condition including;
(i) a second oscillator controlled counter which counts at a second predetermined rate to a second predetermined number and which generates a second output signal each time it reaches said predetermined number;
(ii) said second counter having a reset input and having said pulse train applied thereto so that said counter it reset upon receipt of each pulse;
(iii) a second accumulator having a clock input receiving said second output signals to increment said second accumulator each time a second output signal is received, said second accumulator producing said second control signal whenever the same is incremented to the second preset number.
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Abstract
An ambulatory arrhythmia detection and ECG recorder senses both tachycardia and bradycardia conditions and activates a tape recorder to record the ECG for a period of 15 seconds after an arrhythmia is detected. Tachycardia and bradycardia conditions are sensed by converting the QRS component signals of the ECG into a pulse train which is a real time representation of the patient'"'"'s actual heartbeat and then measuring the time between pulses utilizing two different oscillator controlled counter circuits. The first circuit indicates a tachycardia condition if the time between pulses is less than 500 milliseconds (120 beats per minute) or some other time preset by a doctor and the second circuit indicates a bradycardia condition if the time between pulses is greater than 1200 milliseconds (50 beats per minute) or some other time preset by a doctor. The recorder may also record the ECG waveform for 15 seconds upon a manual activation thereof and at preset intervals such as every half hour or hour in accordance with a preset program.
39 Citations
13 Claims
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1. An ambulatory arrhythmia detection and ECG recorder adapted to be carried by a patient comprising:
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(A) a plurality of electrodes adapted to be placed on the patient'"'"'s body for developing electrical signals indicative of the patient'"'"'s cardiac rhythm; (B) amplifier and filter means connected to said electrodes for amplifying and filtering said electrical signals; (C) recording means for recording the amplified and filtered electrical signals; (D) recorder controller means having a plurality of inputs, said controller means activating said recording means whenever a control signal is applied to one of its inputs; (E) timing means connected to said controller means and said recording means for deactivating said recording means after a preset time period has elapsed; (F) means for converting said amplified and filtered electrical signals into a pulse train wherein each pulse represents a different QRS complex in said electrical signals and is generated in real time with its respective QRS complex; (G) means for determining a tachycardia condition and being connected to one of said inputs to provide a first control signal thereto whenever a tachycardia condition is sensed; (H) said means for determining a tachycardia condition including; (i) a first oscillator controlled counter which counts at a first predetermined rate to a first predetermined number and which generates a first output signal each time it reaches said predetermined number; (ii) said first counter having a reset input and having said pulse train applied thereto so that said counter is reset upon the receipt of each pulse; (iii) a first accumulator having a reset input and a clock input, said reset input receiving said first output signals from said first counter to reset the accumulator each time a first output signal is received, said clock input receiving said pulse train to increment said accumulator each time a pulse is received, said accumulator producing said first conrol signal whenever the same is incremented to a first preset number; (I) means for determining a bradycardia condition and being connected to another of said inputs to provide a second control signal thereto whenever a bradycardia condition is sensed, said means for determining a bradycardia condition including; (i) a second oscillator controlled counter which counts at a second predetermined rate to a second predetermined number and which generates a second output signal each time it reaches said predetermined number; (ii) said second counter having a reset input and having said pulse train applied thereto so that said counter it reset upon receipt of each pulse; (iii) a second accumulator having a clock input receiving said second output signals to increment said second accumulator each time a second output signal is received, said second accumulator producing said second control signal whenever the same is incremented to the second preset number. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification
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Current AssigneeInnovative Medical Systems, Inc. (McKesson Corp.)
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Original AssigneeInnovative Medical Systems, Inc. (McKesson Corp.)
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InventorsIhlenfeld, William III
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Primary Examiner(s)Kamm, William E.
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Application NumberUS06/751,016Time in Patent Office693 DaysField of Search128/689, 128/702-706, 128/708, 128/710-711US Class Current600/525CPC Class CodesA61B 5/333 Recording apparatus special...A61B 5/336 Magnetic recording apparatusA61B 5/363 Detecting tachycardia or br...
