Method to provide computational analysis and feedback during a cardiac rescue
Inventors
Shaker, Matthew Robert • Fleck, Daniel
Assignees
Publication Number
US-11938332-B2
Publication Date
2024-03-26
Expiration Date
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Abstract
A method to provide feedback, coaching, and ECG analysis during a cardiac event. A rescuer would typically be attempting cardiopulmonary resuscitation (CPR) and/or administering an electrical shock from a defibrillator and/or collecting electrocardiogram (ECG) data. The method includes a step of providing a data-generation device (e.g., a camera) and computing components. The computer is used to calculate distances on the fly using data generated by the data-generation device, such as a camera, that may be in motion. The method uses the computer to calculate movement of the chest of a patient and to assess outcomes. When CPR contaminates an ECG, the computer removes the unwanted contamination so that proper guidance to the rescuer can be delivered during CPR.
Core Innovation
A method to provide feedback, coaching, and ECG analysis during a cardiac event. The method includes providing a computer, a stationary feature, a data-generation device, and an article, configuring the computer to receive data from the data-generation device, locating the data-generation device to view the stationary feature and the article, configuring the stationary feature as a fixed reference, configuring the article to be movable with a chest of the person in cardiac distress, viewing the article and the stationary feature with the data-generation device to generate the data sent to the computer, and operating the computer for calculation of a movement of the article over time relative to the stationary feature.
The method uses the computer to calculate distances on the fly using data generated by the data-generation device, such as a camera, that may be in motion, and to calculate movement of the chest of a patient and to assess outcomes. The method further includes simultaneously producing an electrocardiogram, converting data from the data-generation device to produce a CPR frequency and magnitude signal, defining a proportion of the CPR frequency and magnitude signal to remove from the electrocardiogram data stream, and removing the proportion from the electrocardiogram data stream to produce a net electrocardiogram frequency and magnitude data stream. The method also contemplates use of time-of-flight sensors, inertial measurement units, photoplethysmography, and analysis of infrared variations to calculate End Tidal CO2.
Claims Coverage
There is one independent claim. Four main inventive features are extracted from the independent claim.
System components
Providing a computer, a stationary feature, a data-generation device, and an article; configuring the computer to receive data from the data-generation device; and locating the data-generation device to view the stationary feature and the article.
Reference and article configuration
Locating a person in cardiac distress lying on a surface; configuring the stationary feature as a fixed reference; and configuring the article to be movable with a chest of the person in cardiac distress.
Coordinate systems and Z axis
Configuring a Z axis as a direction orthogonal to the surface; configuring each of a plurality of coordinate systems to measure distance on the Z axis; and configuring the data-generation device to be a frame of reference in the plurality of coordinate systems.
Computation of movement and distance difference
Operating the computer to perform a calculation of a movement of the article along the Z axis over time relative to the stationary feature, utilizing the computer to rotate, scale, and translate travel measurements between the plurality of coordinate systems, the calculation comprising a determination of a difference between a first distance defined by a first space between the data-generation device and the stationary feature on the Z axis and a second distance defined by a second space between the article and the data-generation device on the Z axis.
The independent claim recites a method combining system components, configuration of a fixed reference and a movable article, definition of coordinate systems with a Z axis frame, and a computer-based calculation that determines chest movement by computing the difference between two Z-axis distances using transforms between coordinate systems.
Stated Advantages
Provide feedback, coaching, and ECG analysis during a cardiac event.
Determine a depth and rate of cardiopulmonary resuscitation compressions and assess CPR quality and patient outcomes in real-time.
Remove contaminating CPR frequency signal from an ECG data stream to produce a net electrocardiogram frequency and magnitude data stream, enabling ECG analysis without pausing CPR.
Maximize treatment efficacy using computer vision, inertial measurement unit technology, and time of flight technology.
Provide real time CPR recording and feedback instructing the rescuer to push harder, faster, when to pause for a defibrillator shock, when to resume, and when to prompt the rescuer to stop leaning.
Calculate End Tidal CO2 (ETCO2) by analyzing variations in the infrared frequency of exhalations.
Documented Applications
Improving cardiac rescue by providing real time feedback and coaching during CPR and defibrillation.
Simultaneous electrocardiogram acquisition and redaction of CPR artifacts to permit ECG analysis without pausing CPR.
Integration with a defibrillator, including integrating the computer into the defibrillator and warning when activation would be unsafe.
Use with augmented reality glasses and cuing devices to send visual or auditory recommendations and real time guidance to a rescuer.
Use with autonomous or semi-autonomous CPR devices or robots to determine compression depth, location, and to redact CPR artifacts from ECG.
Measuring heart rate using photoplethysmography and calculating End Tidal CO2 (ETCO2) by analyzing infrared exhalation data.
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