Method, apparatus, and system for measuring respiratory effort of a subject

A system for determining a value of one or more parameters of a respiratory effort of a subject, the system comprising:

• a first sensor device configured to obtain a thorax signal (T), the thorax signal (T) being an indicator of a thoracic component of the respiratory effort, the thoracic signal (T) being a thoracic respiratory inductive plethysmograph (RIP) signal;
• a second sensor device configured to obtain an abdomen signal (A), the abdomen signal (A) being an indicator of an abdominal component of the respiratory effort, the abdomen signal (A) being an abdomen respiratory inductive plethysmograph (RIP) signal;
• a processor configured to receive the thorax signal (T) and the abdomen signal (A);
• wherein the processor further is configured to
• receive the thorax signal (T),
• receive an abdomen signal (A), and
• determine, without directly measuring, the value of the one or more parameters of the respiratory effort by
• using constraints and/or relationships of components of a model of a respiratory system of the subject, and
• fitting the components of the model of the respiratory system of the subject with data from the obtained thoracic signal (T) and data from the obtained abdomen signal (A),
• wherein each of the determined one or more parameters of the respiratory effort is different than each of
• the thoracic component of the respiratory effort,
• the abdominal component of the respiratory effort,
• a weighted thoracic component of the respiratory effort,
• a weighted abdominal component of the respiratory effort,
• a paradox component of the respiratory effort, and
• a respiratory movement;
• and
• wherein the one or more parameters include one or more of:
• an airway resistance Rr of the subject;
• an intercostal muscle drive force FTm;
• a diaphragm drive force FAm;
• an intrathoracic pressure PIt;
• respiratory drive;
• a thoracic negative pressure force FTp;
• and
• an abdomen negative pressure force FAp.

A hardware storage device having stored thereon computer executable instructions which, when executed by one or more processors, implement a method of determining a value of one or more parameters of a respiratory effort of a subject, the method comprising:

• obtaining a thoracic signal (T), the thoracic signal (T) being an indicator of a thoracic component of the respiratory effort, the thoracic signal (T) being a thoracic respiratory inductive plethysmograph (RIP) signal;
• obtaining an abdomen signal (A), the abdomen signal (A) being an indicator of an abdominal component of the respiratory effort, the abdomen signal (A) being an abdomen respiratory inductive plethysmograph (RIP) signal;
• and
• determining, without directly measuring, the value of the one or more parameters of the respiratory effort by
• using constraints and/or relationships of components of a model of a respiratory system of the subject, and
• fitting the components of the model of the respiratory system of the subject with data from the obtained thoracic signal (T) and data from the obtained abdomen signal (A),
• wherein each of the determined one or more parameters of the respiratory effort is different than each of
• the thoracic component of the respiratory effort,
• the abdominal component of the respiratory effort,
• a weighted thoracic component of the respiratory effort,
• a weighted abdominal component of the respiratory effort,
• a paradox component of the respiratory effort, and
• a respiratory movement;
• and
• wherein the one or more parameters include one or more of:
• an airway resistance Rr of the subject;
• an intercostal muscle drive force FTm;
• a diaphragm drive force FAm;
• an intrathoracic pressure PIt;
• respiratory drive;
• a thoracic negative pressure force FTp;
• and
• an abdomen negative pressure force FAp.