Non-Invasive iPEEP Estimation via sEMG
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for determining intrinsic end-expiratory pressure (iPEEP) in patients are invasive, cumbersome, and lack precision, particularly for spontaneously breathing patients, as they require esophageal pressure measurements or end-expiratory occlusions, which are not always feasible or accurate.
Innovation Solution
A non-invasive method using continuous estimation of respiratory muscle pressure (Pmus) via surface electromyography (sEMG) to calculate iPEEP by determining the difference or quotient between breathing pressures at specific times during inhalation and exhalation, allowing for more reliable and efficient measurement without the need for invasive procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If esophageal pressure measurements or end-expiratory occlusions are used to determine iPEEP, then measurement precision is improved, but device complexity and ease of operation deteriorate due to invasive procedures
Solution Approach 1:
The patent replaces invasive mechanical measurement systems (esophageal pressure catheters, manual occlusion devices) with a non-invasive electrical signal-based system. Surface electromyography (sEMG) electrodes detect muscle electrical activity, which is then processed to estimate respiratory muscle pressure and calculate iPEEP, eliminating the need for invasive mechanical interventions while maintaining measurement capability
Solution Approach 2:
The patent introduces respiratory muscle pressure (Pmus) estimation as an intermediary parameter between direct esophageal pressure measurement and iPEEP calculation. By measuring sEMG signals and converting them to Pmus estimates through calibration, the system creates a non-invasive pathway to determine iPEEP that avoids direct esophageal catheterization while maintaining measurement accuracy
2Measurement precision
If esophageal pressure measurements are used to determine iPEEP, then measurement precision is improved, but device complexity increases due to invasive catheters and specialized equipment
Solution Approach 1:
The patent replaces complex invasive mechanical measurement systems with a simplified electrical signal processing system. Instead of requiring esophageal catheters, pressure transducers, and manual occlusion apparatus, the invention uses surface electromyography electrodes and digital signal processing to estimate respiratory muscle pressure and calculate iPEEP, dramatically reducing device complexity
Solution Approach 2:
The patent creates a functional copy of the invasive measurement system using non-invasive means. By calibrating the relationship between sEMG signals and actual respiratory muscle pressure, the system generates an accurate estimate (copy) of the invasive measurement without requiring the invasive equipment, thereby simplifying the device while maintaining measurement precision
3Measurement precision
If end-expiratory occlusions are performed to measure iPEEP, then measurement precision is improved, but loss of time increases due to procedural interruptions
Solution Approach 1:
The patent enables continuous iPEEP monitoring by processing sEMG signals in real-time without requiring periodic occlusion maneuvers. The system continuously estimates respiratory muscle pressure from ongoing muscle activity signals, providing uninterrupted iPEEP values that eliminate measurement gaps and procedural interruptions inherent in occlusion-based methods
Solution Approach 2:
The patent performs preliminary calibration during initial patient setup, establishing the relationship between sEMG signals and respiratory muscle pressure. Once calibrated, the system can continuously calculate iPEEP without requiring repeated occlusion maneuvers, as the calibration data enables direct computation from routine muscle activity signals
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach provides a more accurate and continuous assessment of iPEEP, reducing the need for invasive measurements and enabling better coordination of ventilation and muscle stimulation, improving patient care by enhancing breathing assistance and reducing lung damage.
Implementation Method 1
A non-invasive method using continuous estimation of respiratory muscle pressure (Pmus) via surface electromyography (sEMG)
Data Source
AI summary
A process and a device determine an indicator of an intrinsic end-expiratory pressure in the lungs of a patient. Embodiments are based on the device, ventilator with the device, and the process using the device that includes an interface arrangement configured for an exchange of information with a ventilation device and a control unit that determines first information on a first breathing pressure generated by muscles of the patient, at a first time, at which an inhalation attempt of the patient is present and determines second information on a second breathing pressure generated by the muscles of the patient, at a second time, at which breathing gas flow towards the patient starts. The control unit further determines the indicator of the intrinsic end-expiratory pressure based on the first information and based on the second information.