Ventilator Gas Blender SpO2 Feedback Control
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Solution Overview
Problem
Mechanical ventilators face challenges in properly regulating the fraction of inspired oxygen (FiO2) levels, leading to potential lung injury and hypoxemia if not managed correctly, highlighting the need for improved methods and systems to control gas mixtures.
Innovation Solution
A computer-implemented method that uses peripheral arterial oxygen saturation (SpO2) data from a pulse oximeter to determine partial pressure of oxygen (PaO2) data through a lookup table, adjusting the FiO2 levels in the ventilator's gas blender based on initial and variable offsets, and updating lung function gains dynamically to optimize oxygen delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gas blender is used to control FiO2 levels in mechanical ventilators, then the patient receives regulated oxygen mixture, but the patient may still suffer from hypoxemia or hyperoxia due to improper regulation
Solution Approach 1:
The system continuously monitors SpO2 levels and uses this feedback to dynamically adjust FiO2 levels. The controller compares actual SpO2 readings with target values and modifies the oxygen mixture accordingly, creating a closed-loop control system that prevents both hypoxemia and hyperoxia
Solution Approach 2:
The system changes the FiO2 parameter dynamically based on real-time SpO2 measurements and patient-specific factors. By adjusting the fraction of inspired oxygen according to actual physiological needs rather than fixed settings, the system optimizes oxygen delivery while preventing lung injury
2Reliability
If SpO2 data is used to determine PaO2 through lookup tables and adjust FiO2 dynamically, then oxygen delivery is optimized, but the system complexity increases
Solution Approach 1:
The system pre-calculates and stores SpO2-to-PaO2 conversion data in lookup tables during the design phase. This preliminary preparation allows the controller to quickly determine PaO2 values from SpO2 measurements without performing complex real-time calculations, reducing computational complexity while maintaining accuracy
Solution Approach 2:
The patent introduces an intermediary lookup table that mediates between SpO2 measurements and FiO2 control. Instead of directly controlling FiO2 based on complex algorithms, the system uses the lookup table as an intermediary to translate SpO2 data into appropriate FiO2 settings, simplifying the control logic
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 effectively regulates FiO2 levels, minimizing the risk of ventilator-induced lung injury by adapting to the patient's respiratory distress levels, ensuring optimal oxygen delivery and reducing the risk of hyperoxia or hypoxia.
Implementation Method 1
receiving first peripheral arterial oxygen saturation (SpO2) data from a pulse oximeter
Implementation Method 2
determining first fraction of inspired oxygen in air (FiO2) data for setting a mixture in a gas blender in the ventilator mechanism
Data Source
AI summary
Disclosed herein are methods, systems, and devices for controlling a gas mixture within a mechanical ventilator. According to one embodiment, a computer implemented method includes receiving first peripheral arterial oxygen saturation (SpO2) data from a pulse oximeter via a pulse oximeter interface, wherein the pulse oximeter is configured to monitor a patient receiving invasive ventilation; determining a first mode of operation for a ventilator mechanism, wherein the ventilator mechanism is configured to provide at least a portion of the invasive ventilation; determining first partial pressure of oxygen (PaO2) data stored in a first lookup table using the first SpO2 data, wherein the first lookup table is derived from a sigmoid shaped oxyhemoglobin dissociation curve; determining first fraction of inspired oxygen in air (FiO2) data for setting a mixture in a gas blender in the ventilator mechanism based on the first PaO2 data and a variable offset; and providing the FiO2 data to the ventilator mechanism.