Processing impedance signals for breath detection
First Claim
1. An apparatus comprising:
- a medical device comprising a feedback device, a memory, and a processor;
a plurality of electrodes configured to provide at least an electrical impedance signal to the processor, wherein the electrical impedance signal corresponds to an electrical impedance measured at a chest of a patient; and
one or more sensors configured to provide a chest compression motion signal to the processor, wherein the chest compression motion signal is indicative of chest compressions performed by a rescuer on the patient during a cardiopulmonary resuscitation (CPR) treatment of the patient,wherein the processor is configured to receive the electrical impedance signal and the chest compression motion signal and further wherein the processor is configured to execute instructions to;
determine one or more chest compression motion characteristics from the chest compression motion signal;
determine one or more threshold values based at least in part on the one or more chest compression motion characteristics;
based at least in part on the one or more chest compression motion characteristics, remove artifacts from the electrical impedance signal to generate a filtered electrical impedance signal;
determine a threshold signal from the filtered electrical impedance signal based on the one or more threshold values; and
detect airflow activities of the patient based at least in part on the threshold signal; and
present, via the feedback device, feedback for the rescuer to initiate appropriate action to modify the CPR treatment, based on the detected airflow activities of the patient, for adjusting the CPR treatment of the patient.
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Accused Products
Abstract
An apparatus includes a computing device that includes a memory configured to store instructions. The computing device also includes a processor to execute the instructions to perform operations that include receiving a signal representative of electrical impedance in a chest of a patient, and, receiving a signal representative of the motion of chest compressions performed on the patient during a cardiopulmonary resuscitation (CPR) treatment. The operations also include processing the received signal representative of the motion of chest compressions to determine one or more characteristics of the motion, and, processing the received signal representative of the electrical impedance to determine parameters relevant to a production of a signal representative of airflow activities of the patient. Operations also include modifying the one or more determined parameters based on the one or more determined characteristics of the motion to produce the signal representative of airflow activities of the patient.
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Citations
37 Claims
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1. An apparatus comprising:
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a medical device comprising a feedback device, a memory, and a processor; a plurality of electrodes configured to provide at least an electrical impedance signal to the processor, wherein the electrical impedance signal corresponds to an electrical impedance measured at a chest of a patient; and one or more sensors configured to provide a chest compression motion signal to the processor, wherein the chest compression motion signal is indicative of chest compressions performed by a rescuer on the patient during a cardiopulmonary resuscitation (CPR) treatment of the patient, wherein the processor is configured to receive the electrical impedance signal and the chest compression motion signal and further wherein the processor is configured to execute instructions to; determine one or more chest compression motion characteristics from the chest compression motion signal; determine one or more threshold values based at least in part on the one or more chest compression motion characteristics; based at least in part on the one or more chest compression motion characteristics, remove artifacts from the electrical impedance signal to generate a filtered electrical impedance signal; determine a threshold signal from the filtered electrical impedance signal based on the one or more threshold values; and detect airflow activities of the patient based at least in part on the threshold signal; and present, via the feedback device, feedback for the rescuer to initiate appropriate action to modify the CPR treatment, based on the detected airflow activities of the patient, for adjusting the CPR treatment of the patient. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. One or more non-transitory computer readable media storing processor executable instructions configured to cause a processor to perform operations comprising:
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receiving, from a plurality of electrodes, an electrical impedance signal representative of electrical impedance of a chest of a patient; receiving, from one or more motion sensors, one or more signals indicative of chest compression motion for chest compressions performed on the patient during a cardiopulmonary resuscitation (CPR) treatment; determining one or more chest compression motion characteristics from the one or more signals indicative of the chest compression motion; determining one or more threshold values based at least in part on the one or more chest compression motion characteristics; based at least in part on the one or more chest compression motion characteristics, removing chest compression artifacts from the electrical impedance signal to generate a filtered electrical impedance signal; determining a threshold signal from the filtered electrical impedance signal based on the one or more threshold values; detecting airflow activities of the patient based at least in part on the threshold signal; and presenting, via a feedback device, feedback for a rescuer to initiate appropriate action to modify the CPR treatment, based on the detected airflow activities, for adjusting the CPR treatment of the patient. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A computing device implemented method comprising;
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receiving, from a plurality of electrodes, an electrical impedance signal representative of electrical impedance of a chest of a patient; receiving, from one or more motion sensors, one or more signals indicative of chest compression motion for chest compressions performed on the patient during a cardiopulmonary resuscitation (CPR) treatment; determining one or more chest compression motion characteristics from the one or more signals indicative of the chest compression motion; determining one or more threshold values based at least in part on the one or more chest compression motion characteristics; based at least in part on the one or more chest compression motion characteristics, removing chest compression artifacts from the electrical impedance signal to generate a filtered electrical impedance signal; determining a threshold signal from the filtered electrical impedance signal based on the one or more threshold values; detecting airflow activities of the patient based at least in part on the threshold signal; and presenting, via a feedback device, feedback for a rescuer to initiate appropriate action to modify the CPR treatment, based on the detected airflow activities, for adjusting the CPR treatment of the patient. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37)
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Specification