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Publication Number
US-12357534-B2
Publication Date
2025-07-15
Expiration Date
Abstract
Among other things, in one aspect, we describe a system for assisting with cardiopulmonary resuscitation (CPR). The system includes at least one sensor; and one or more processors configured for calculating a chest compliance relationship based on data received from the at least one sensor, and determining a neutral position of chest compression based at least in part on a feature of the chest compliance relationship. The system can take the form of an active compression-decompression device.
Core Innovation
The invention provides cardiopulmonary resuscitation (CPR) using an active compression-decompression device in a manner that determines chest compliance during continuous administration. Force data is received from at least one force sensor provided with the active compression-decompression device, and an instantaneous chest compliance value is determined at a particular time based on the received force data.
The instantaneous chest compliance value comprises a mathematical relationship expressing a change of displacement of the patient’s chest between the particular time and a reference time and a change in determined force at the particular time and at the reference time. The determined force is based on the received force data, and the instantaneous chest compliance value is used to generate an indication to adjust one or more CPR parameters during continuous administration of active compression-decompressions.
The disclosure also characterizes chest compliance using features of a chest compliance relationship and chest compliance curve, including compliance curve forms such as non-hysteresis and hysteresis loop characterizations and compliance described as instantaneous compliance and absolute compliance. The estimated neutral chest-compression position derived from the chest compliance relationship is used to determine phase-dependent measurements and user feedback during chest-wall remodeling.
Claims Coverage
The partial claims include two independent claims. Both claims center on using force sensor data to compute an instantaneous chest compliance value based on displacement change relative to a reference time and corresponding change in determined force, and using that compliance value to generate an indication to adjust one or more CPR parameters during continuous administration.
Instantaneous chest compliance based on displacement-change and force-change relationship
Receiving force data from at least one force sensor, and determining an instantaneous chest compliance value at a particular time during continuous administration based on a mathematical relationship expressing a change of displacement of the patient’s chest between the particular time and a reference time and a change in determined force at the particular time and at the reference time, wherein the determined force is based on the received force data.
Adjusting CPR parameters based on instantaneous chest compliance value
Adjusting one or more CPR parameters of the administered active compression-decompressions based on the instantaneous chest compliance value during continuous administration.
CPR system generating an indication to adjust CPR parameters based on instantaneous chest compliance
Generating an indication to adjust one or more CPR parameters of the delivered active compression-decompressions based on the instantaneous chest compliance value during continuous administration.
Across both independent claims, the core inventive coverage is the computation of an instantaneous chest compliance value from force sensor data via a displacement-change/force-change relationship relative to a reference time, and the use of that compliance value to adjust CPR parameters or to generate an indication for adjustment during continuous active compression-decompression CPR.
Stated Advantages
Reduce injury risk during chest-wall remodeling by using compliance-derived indications and threshold indicators related to injury potential.
Improve effectiveness of CPR by providing phase-dependent measurements and user feedback based on an estimated neutral chest-compression position derived from the chest compliance relationship.
Documented Applications
Providing active compression-decompression CPR to a patient by administering compressions and decompressions while estimating neutral chest-compression position using a chest compliance relationship, and using phase-dependent CE/CN depth and DE/DN height measurements with threshold-based user feedback or indications to adjust CPR parameters.
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