EIT-Guided Ventilation Control for Rapid PEEP Adjustment
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Solution Overview
Problem
Existing ventilation systems lack a reliable and efficient method to dynamically adjust ventilation settings in response to changing respiratory conditions of a being, particularly in time-constrained medical environments.
Innovation Solution
A system comprising a ventilator and EIT measuring device that records impedance values during reference and test phases, calculates characteristics, and compares them to adjust ventilation settings, including PEEP and inspiratory pressure, to optimize lung ventilation based on impedance changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ventilation settings are adjusted incrementally with EIT measurements to find suitable PEEP settings, then ventilation effectiveness is improved, but time consumption increases significantly
Solution Approach 1:
The system performs preliminary EIT measurements during a habituation phase before the actual measurement phase, allowing the patient to adapt to the ventilation settings in advance. This preliminary action reduces the time needed for subsequent measurements and enables faster determination of optimal PEEP settings without compromising measurement accuracy
Solution Approach 2:
The system continuously performs EIT measurements throughout both habituation and measurement phases, maintaining continuous monitoring of lung impedance changes. This continuous measurement approach allows for real-time assessment of ventilation effectiveness and rapid identification of optimal settings, reducing overall time consumption compared to discrete measurement intervals
2Adaptability or versatility
If EIT measurements are performed frequently to monitor changing respiratory conditions, then ventilation optimization is improved, but measurement time and patient burden increase
Solution Approach 1:
The monitoring process is segmented into distinct phases: habituation phase and measurement phase. Each phase serves a specific purpose and can be performed selectively based on clinical needs. This segmentation allows frequent monitoring when conditions change while reducing measurement burden during stable periods
Solution Approach 2:
The system implements periodic measurement cycles with defined habituation and measurement phases. These periodic actions can be repeated at appropriate intervals to monitor changing respiratory conditions without requiring continuous intensive measurement, thus balancing adaptability with time efficiency
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
Enables rapid and effective adjustment of ventilation settings to improve lung compliance and respiratory outcomes by identifying recruitment or derecruitment, hyperexpansion, or weakening hyperexpansion, facilitating automated recommendations for improved patient care.
Implementation Method 1
EIT (electrical impedance tomography) allows spatially differentiated information to be ascertained in relation to the state of a lung. EIT is a noninvasive method, in which weak AC currents flow through the body and voltages are generated at the surface in the process.
Implementation Method 2
Within the scope of EIT, the surface voltages or conductivities are measured on the body, which depend on the impedances or the distribution thereof within for example the thorax. Pixels are recorded in the process; in this case, each pixel reproduces an electrical conductivity or impedance.
Data Source
AI summary
A system for ventilation of a being, comprising at least one ventilator and at least one EIT measuring device, the ventilator comprising at least one controllable respiratory gas source and a programmable control unit for controlling the respiratory gas source and the EIT measuring device comprising at least one sensor apparatus for measuring impedance values of at least one lung of the being and at least one calculation and evaluation unit, and the system assigning the impedance values measured by way of the at least one sensor apparatus to pixels n, and the control unit being configured as specified in the claims.