Pulse detection apparatus, software, and methods using patient physiological signals
First Claim
1. An electrotherapy device, comprising:
- a first sensor, that is adapted to be external to and adapted to be placed on a patient, and configured to sense a phonocardiogram (PCG) signal in the patient;
a second sensor, that is adapted to be external to and adapted to be placed on the patient, and configured to receive an impedance-sensing signal from the patient;
an electrotherapy generator, that is external to the patient, and is configured for delivering pacing stimuli to the patient through a skin of the patient; and
processing circuitry, that is adapted to be external to the patient, and configured to analyze each of the PCG and impedance-sensing signals for features indicative of a presence of a cardiac pulse and determine based on each of the features indicative of a presence of a cardiac pulse, whether the cardiac pulse occurred in the patient following the delivery of a pacing stimulus of the pacing stimuli to the patient the processing circuitry increasing a current of further pacing stimuli to be delivered to the patient if the cardiac pulse did not occur in the patient following the delivery of the pacing stimulus.
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Accused Products
Abstract
The presence of a cardiac pulse in a patient is determined by evaluating physiological signals in the patient. In one embodiment, a medical device evaluates two or more different physiological signals, such as phonocardiogram (PCG) signals, electrocardiogram (ECG) signals, patient impedance signals, piezoelectric signals, and accelerometer signals for features indicative of the presence of a cardiac pulse. Using these features, the medical device determines whether a cardiac pulse is present in the patient. The medical device may also be configured to report whether the patient is in a VF, VT, asystole, or PEA condition, in addition to being in a pulseless condition, and prompt different therapies, such as chest compressions, rescue breathing, defibrillation, and PEA-specific electrotherapy, depending on the analysis of the physiological signals. Auto-capture of a cardiac pulse using pacing stimuli is further provided.
112 Citations
8 Claims
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1. An electrotherapy device, comprising:
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a first sensor, that is adapted to be external to and adapted to be placed on a patient, and configured to sense a phonocardiogram (PCG) signal in the patient; a second sensor, that is adapted to be external to and adapted to be placed on the patient, and configured to receive an impedance-sensing signal from the patient; an electrotherapy generator, that is external to the patient, and is configured for delivering pacing stimuli to the patient through a skin of the patient; and processing circuitry, that is adapted to be external to the patient, and configured to analyze each of the PCG and impedance-sensing signals for features indicative of a presence of a cardiac pulse and determine based on each of the features indicative of a presence of a cardiac pulse, whether the cardiac pulse occurred in the patient following the delivery of a pacing stimulus of the pacing stimuli to the patient the processing circuitry increasing a current of further pacing stimuli to be delivered to the patient if the cardiac pulse did not occur in the patient following the delivery of the pacing stimulus. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification